Backlight device, display device and television receiver

FIELD: physics.

SUBSTANCE: backlight unit (49) of a display device (69), having a liquid crystal display panel (59), has a base (41), a diffusing plate (43) which is supported by the base, and a point light source for irradiating the diffusing plate with light. The point light source has a light-emitting diode (22) mounted on a mounting substrate (21). A plurality of light-emitting diodes covered by divergent lenses (24) are provided. Optical axes (OA) of the divergent lenses are inclined relative the diffusing plate, and the divergent lenses, having different inclinations of optical axes, are placed randomly on the base. The divergent lenses, having optical axes that are inclined in opposite directions, are paired and the pairs are arranged in a matrix.

EFFECT: reduced non-uniformity of luminance and hue.

25 cl, 12 dwg

 

The technical field

The present invention relates to an illumination device, display device including the illumination device, and a television receiver including the display device.

The level of technology

The display device containing the display panel, which itself does not emit light, for example, a liquid crystal display panel, usually combined with an illumination device that illuminates the display panel from behind. As a light source of the illumination device of this type, used light sources of different kinds, for example, lamp cold cathode and the light emitting element. Examples of light-emitting elements include light-emitting diode (hereinafter referred to as "LEDs"), organic electroluminescent element, and organic electroluminescent element, among which the led is the most used at the present time. Described in Patent document 1, the light source device of the backlight is also a led.

In the illumination device described in Patent document 1, as shown in Figure 10, the LEDs 122 are installed on the mounting substrate 121 and, in addition, to the mounting substrate 121 is attached lens 124, which cover the respective LEDs 122. Mounting substrate 121, led lights-Senso is od 122, and the lens 124 form a light-emitting module mj. Lots of light emitting modules mj are placed in a matrix, forming a planar light source.

As you can see from the Patent document 1, the lens usually is combined with the light-emitting element. A lens of this type shall be so designed as to reduce the directivity of the light emitted by the light emitting element. An example of such lenses can be seen in the Patent document 2.

In the illumination device of this type, as described in Patent document 1, is the set of point light sources, whereas, in the illumination device of this type, as described in Patent document 3, is the set of linear light sources, for example, a lamp with a cold cathode. When the illumination device, which includes multiple light sources, therefore, is combined with the display device, if the light from the light source is directly deduced from the device backlight on the screen occurs unevenness of brightness. Therefore, between the light source and a display device for scattering light scattering is placed the plate. The scattering plate is usually formed as part of the illumination device, as shown in Patent document 3.

The list of citations

Patent document

Patent document 1: JP 2008-41546 And

A patent is a document 2: JP 2008-147453 A

Patent document 3: JP 2005-19065 A

The Invention

Technical Problem

When forming the planar light source with multiple point sources of light increases when the scattering function of the lens, combined with a point light source, sometimes decreases the amount of light emitted in the direction of the optical axis of the point light source, and the brightness is reduced. The scattering characteristics of change depending on the combination or arrangement of point light source and the lens, and, as a result, the scattering plate may be affected by the uneven luminance or uneven tones.

The present invention was made in view of the foregoing and, therefore, the aim of the present invention is to reduce to the extent possible, the uneven brightness and uneven tones that can appear on the scattering plate in the illumination device includes a point light source, covered by the lens and diffuser plate, illuminated by the light from a point light source.

Solution

In accordance with a preferred implementation of the present invention provides the illumination device, comprising: diffusing plate; and a point light source for irradiating light scattering plate is where the point light source is a light emitting element, mounted on the mounting substrate, and comprises many point light sources, and each of the point light sources is covered by the lens, and lenses having different inclinations of the optical axes, are mixed.

With this structure, not all the optical axis of light beams emitted from the lens orthogonal to the scattering plate, and scattered in a particular direction, the light beams are mixed. The result independently solely on methods of reducing the focus lens, the degree of mixing of the light rays on the scattering plate increases, and the quality of mixing colors on a scattering plate is improved, and the unevenness of luminance and the unevenness of the shades on the scattering plate is reduced.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the lens having inclined in opposite directions to the optical axis, paired, and the pairs are placed in the matrix.

With this structure, the planar light source formed from a matrix of lens pairs that complement each other in brightness and shades and thus, uneven brightness and uneven tones on the scattering plate effectively reduced.

Under the preferred implementation of the present invention, in the illumination device having the above structure, many lenses are grouped so that the number of inclinations of the optical axes formed loop, and groups are placed in the matrix.

With this structure, the planar light source formed from a matrix of lens groups, which complement each other in brightness and shades and thus, uneven brightness and uneven tones on the scattering plate effectively reduced.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, grouped many lenses so that the optical axis within the group were directed to one point, and groups are placed in the matrix.

With this structure, the planar light source formed from a matrix of lens groups, which complement each other in brightness and shades and thus, uneven brightness and uneven tones on the scattering plate effectively reduced.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, each of the lenses has the function of scattering light.

With this structure, the function of scattering light lens allows you to get a reasonable scattering of light.

In accordance with preferably the m variant of realization of the present invention, in the illumination device having the above structure, the function of scattering light is attached to the lens by processing for roughening their surface to the mounting substrate.

With this structure, the scattering becomes more acceptable.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the light-emitting element can be led.

With this structure, bright illumination device can be obtained with the use of modern LEDs have significantly increased the brightness. In addition, can be increased operation time of the light source and can be lowered power consumption of the light source.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led is formed by applying a fluorescent material having an emission maximum in the range of yellow, which is a crystal that emits visible blue light to obtain white light.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led is formed by applying fluorescent materials, one of which has a max the minimum radiation in the range of green light, the other has the emission maximum in the range of red color, crystal, emitting blue light to obtain white light.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led is formed by applying a fluorescent material having an emission maximum in the range of green light in the crystal, which emits blue light, and in combination with crystal, emitting a red light to obtain white light.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led is formed by a combination of crystal, emitting blue light, crystal, emitting green light, and crystal, emitting a red light to obtain white light.

The color tone of the led which emits white light may vary due to, for example, a stronger blue light. Receiving the white light thus, as described in the present invention, the color tone as a whole averaged, and can be received light illuminator having essentially uniform color tone.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led represents to the minciu crystal with UV light and fluorescent material.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the led is formed by applying fluorescent materials, one of which has the emission maximum in the range of blue light, the other has the emission maximum in the range of green light, and one emits in the range of a red color, a crystal with UV light to obtain white light.

When the light source is a crystal with UV light, the color tone may change. In accordance with the structure of the present invention, the color tone as a whole averaged, and can be received light illuminator having essentially uniform color tone.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the multiple point light sources is placed on the mounting substrate, which has a shape with a longitudinal direction, and the mounting substrate is placed on the base.

With this structure, in comparison with a case in which point light sources are placed on the base, one after another, the efficiency of Assembly can be improved.

In accordance with a preferred implementation of the present invention, in the device p is tsvetki, with the above structure, the multiple point light sources are placed on a straight line parallel to the longitudinal direction of the mounting substrate.

With this structure, the aspect in which the mounting substrate is placed uniquely determines the aspect that hosts point sources of light and, thus, the choice of location of point light sources becomes more simple.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the multiple point light sources are placed on a straight line with uniform intervals.

With this structure, accommodation point light sources does not change the mounting substrate and, thus, the mounting substrate can be used, even if the size of the device backlight is changed.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, a variety of mounting substrates are placed on the base and adjacent the mounting substrate, among a variety of mounting substrates are connected to each other using the connector.

With this structure, if prepared many kinds of mounting substrates of various sizes, even when formed in which trojstva illumination of different sizes, changing the kinds of mounting substrates, combining and connecting the mounting substrate to each other using the connector, the mounting can be easily performed. Therefore, there is no need to design specialized mounting substrate for each device size backlight, which contributes to cost reduction.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the mounting substrate, which are aligned in the longitudinal direction, among a variety of mounting substrates are adjacent mounting substrates.

With this structure, preparing many kinds of mounting substrates of different lengths, in other words, having a different number of point light sources mounted on them, even when formed of devices of illumination of different sizes by changing the kinds of mounting substrates, combining and connecting the mounting substrate to each other using the connector, the mounting can be easily performed. Therefore, there is no need to design specialized mounting substrate for each device size backlight, which contributes to cost reduction.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the connector which engages in a combination of half of the connector, attached to one of the adjacent mounting substrates, and half of the connector attached to the other one of the adjacent mounting substrates and at least one of the halves of the connector protrudes outward from the edges of the mounting substrate to which is attached one of the halves of the connector.

With this structure, the mounting substrate, which are adjacent to each other are connected to each other using the connector, at least one of the halves of the connector protrudes outward from the edges of the mounting substrate to which one of the halves of the connector are attached and, therefore, the connection between the two halves of the connector can be easily performed.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the connector includes an outer surface bright colors.

With this structure, the optical reflectivity of the connector is improved, and the connector is less likely to absorb light and, thus, uneven brightness on the scattering plate may be reduced.

In accordance with a preferred implementation of the present invention, in the illumination device having the above structure, the multiple point light sources are electrically connected in series.

PR is the structure, the current supplied to each of the point light sources can be set the same, and the amount of light emitted from each point light sources, can be made uniform and, thus, the uniformity of brightness on the scattering plate can be improved.

In accordance with a preferred implementation of the present invention, the display device includes: an illumination device having the above structure; and a display panel that receives light from the illumination device.

When this structure can be obtained a display device with reduced unevenness in brightness and reduced unevenness of colors.

In accordance with a preferred implementation of the present invention, in the display device having the above structure, the display panel includes a liquid crystal display panel.

When this structure can be obtained a display device with reduced unevenness in brightness and reduced unevenness of colors.

In accordance with a preferred implementation of the present invention, is formed of a television receiver including the display device having the above structure.

When this structure can be obtained with TV, the traditional receiver with reduced unevenness in brightness and reduced unevenness of colors on its screen.

Useful Effects of the Invention

In accordance with the present invention, intentionally tilting the optical axis of the lens and attaching the lenses of different inclinations of the optical axes in a chaotic fashion, the degree of mixing of the light rays on the scattering plate can be made large, the property of mixing colors on a scattering plate can be improved, and the unevenness of luminance and the unevenness of the shades on the scattering plate may be reduced.

Brief Description of Drawings

Figure 1 depicts an Exploded perspective view of a display device including the illumination device in accordance with a preferred variant implementation of the present invention.

Figure 2 is a partial view in section of the device of the backlight in accordance with the first variant of realization of the present invention.

Figure 3 is a partial view in plan of the illumination device shown in figure 2.

Figure 4 - types in terms of the scattering lenses of different options.

Figure 5 - types in terms of the scattering lenses of different options.

6 is a partial view in section of the device of the backlight in accordance with a second embodiment implementing the present invention.

Fig.7 is a view in plan of the scattering of the lenses constituting the illumination device in accordance with a third variant of realization of this image is the shadow.

Fig - view in plan of the scattering of the lenses constituting the illumination device in accordance with the fourth alternative implementation of the present invention.

Figure 9 - exploded perspective view of a television receiver.

Figure 10 - exploded perspective view of conventional illumination device.

11 is a graph showing the difference of light depending on the direction of radiation of the LEDs.

Fig - view, showing the total image brightness from a variety of LEDs.

Description of implementation options

The structure of a display device including the illumination device in accordance with the preferred options for the implementation of the present invention, considered in connection with Figure 1-3. In figure 1, the device 69 display is shown as placed horizontally with the plane of the display and as being on its upper side.

The device 69 display includes a liquid crystal panel 59 display as the display panel. The liquid crystal panel 59 and display unit 49 backlight to illuminate the liquid crystal panel 59 display back, are placed in the housing. The housing formed by the Assembly of the front body element HG1 and rear of the body element HG2.

The liquid crystal panel 59 of the display formed by the connection of the substrate 51 active matrix, includes switching elements such as thin film transistors (TFT), and the opposite substrate 52, which is opposed to the substrate 51 active matrix with a sealing material (not shown), and filling liquid crystal in the space between the substrate 51 of the active matrix and the opposite substrate 52.

Polarizing film 53 respectively are bonded to the light-receiving side surface of the substrate 51 of the active matrix and the light-emitting side of the opposite substrate 52. The liquid crystal panel 59 display uses the change in light transmittance due to the tilt of liquid crystal molecules, to form an image.

Block 49 backlight, which is a specific type of illumination device in accordance with the present invention, has the following structure. In particular, block 49 backlight includes a light emitting modules MJ, the base 41, the reflective sheet 42 is large in size, the scattering plate 43, a prism sheet 44, and microlensing sheet 45.

The base 41 has the form of a pallet, and its vertical walls 41b formed on the periphery of the rectangular main surface 41a.

Light-emitting module MJ includes a mounting substrate 21, a point light source placed on the mounting substrate 21, a lens 24, which covers that is echny light source, and built-in reflective sheet 11. A point light source includes a light emitting element mounted on the mounting substrate 21. Light-emitting element in accordance with this implementation option is the led 22.

The lens 24 has the function of scattering light. Here is the function value of the scattering of light by a lens 24. For example, in the case of the illumination device described in Patent document 1, as shown in Figure 10 the device of the backlight, the lens 124, respectively, are combined with LEDs 122, but the scattering of light from the respective LEDs 122 little. Therefore, to eliminate the unevenness of brightness, it is necessary to place a large number of light emitting modules mj with high density. Therefore, costs of components and the cost of installation increases, which makes the device backlight expensive in General.

The brightness of modern LEDs are becoming more and more high, and a relatively small number of LEDs may bring light to the entire screen. However, the use of LEDs with high brightness can cause uneven brightness and, thus, it is preferable that the LEDs used in combination with lenses respectively have the function of scattering light. Lens having a function of scattering SV is the denoted here as "diverging lens".

Figure 11 shows a graph showing the difference of illuminance (in Lux) depending on the direction of light for outdoor LEDs and LEDs with diffuser lens. In the case of open led illumination has a maximum at an angle of 90°, which is the angle the optical axis, and decreases sharply with distance from this angle. On the other hand, in the case of led with diffuser lens, the area in which the illumination is at a specified level, or more, can be increased, and the maximum illumination may be installed at an angle that is different from the angle of the optical axis. It should be noted that, of course, shows a picture of the light can be changed depending on the structure of the scattering lens.

On Fig chart shows the total brightness from multiple LEDs. In the figure, the curves with solid lines show the brightness of the led with diffuser lenses, whereas the dashed curves show the brightness outdoor led lights. Horizontal lines on the curves indicate the width of the peaks, respectively, when the brightness is half of the maximum value (full width at half maximum). In the case of led with diffuser lenses you can make it so that each peak of the wave chart had a large width and is thus, it is easy to make the overall brightness such that all of it had a flat shape, as shown by the solid line in the upper plot the drawing. On the other hand, in the case of open LEDs, each peak of the curve has a large height and small width, and the overall brightness is inevitably uneven. The image with uneven brightness is undesirable and, thus, it becomes almost inevitable use of LEDs with diffuser lenses.

In view of the above, the light emitting module MJ is adapted for the inclusion of the dispersive lens 24.

The surface of the diffuser lens 24, which converts to the mounting substrates 21 can be subjected to processing for roughening, for example, graining, to give the function of scattering light. This allows you to more successfully diffuse light.

The mounting substrates 21 are elongated rectangles. Mounting surface 21U, which is the upper surface of each of the mounting substrate 21, has many electrodes (not shown)formed therein at predetermined intervals on a straight line parallel to the longitudinal direction of the mounting substrate 21 and the LEDs 22 are mounted on the electrode. The mounting substrate 21 is a substrate that is common to many of the LEDs 22. More specifically, a set of LEDs 22 is placed is predetermined intervals, in this case, with predetermined regular intervals on a straight line parallel to the longitudinal direction of the mounting substrate 21, as shown in figure 1.

A set of LEDs 22 is placed on the mounting substrate 21, which has the form of a longitudinal direction, and the mounting substrate 21 is placed on the base 41, and thus, compared with the case where the LEDs 22 are placed on the base 41 one after another, the efficiency of Assembly can be improved. In addition, a set of LEDs 22 is placed on a straight line parallel to the longitudinal direction of the mounting substrate 21, and thus, a variation in which the mounting substrate 21 are the only way that detects, in which are placed the LEDs 22. Therefore, the development of the location of the LEDs 22 becomes simpler. A set of LEDs 22 are placed at regular intervals on a straight line and, thus, the option in which are placed the LEDs 22, does not change the mounting substrate 21. Therefore, the mounting substrate 21 can be used, even if you change the block size 49 backlight.

Each of the diffuser lens 24 has a circular shape in plan, has a lot of legs 24a on its bottom surface, and attached to the mounting substrate 21 by gluing the ends of legs 24a, to the mounting surface 21U Monts is Noah substrate 21 by using an adhesive substance. The presence of legs 24a creates a gap between the mounting substrate 21 and the diffuser lens 24. The air flow that passes through the gap to cool the led 22. It should be noted, if it can be solved the problem of heat dissipation, it can also be used integrally-formed light-emitting module having the led, built-in diffusing lens.

As the LEDs 22 can be used in different types of LEDs. For example, this may be a led, which is formed by applying a fluorescent material having an emission maximum in the range of yellow light on the crystal, which emits blue light to obtain white light. Can also be used with the led, which is formed by applying fluorescent materials, one of which has the emission maximum in the range of green light, the other has the emission maximum in the red range, crystal, emitting blue light to obtain white light. Can also be used with the led, which is formed by applying a fluorescent material having an emission maximum in the range of green light in the crystal, which emits blue light, and in combination with a red light-emitting crystal, to obtain white light. You can also use the led, which is formed by a combination of crystal, emitting blue light of the crystal, emitting green light, and crystal, emitting a red light to obtain white light.

The color tone of the led which emits white light may vary due to, for example, a stronger blue light. Receiving white light in the manner described above, the color tone as a whole averaged, and can be received light illuminator having essentially uniform color tone.

As LEDs of a different type, can also be used led, formed by the combination of crystal UV light with a fluorescent material, in particular formed by applying fluorescent materials, one of which has the emission maximum in the range of blue light, the other has the emission maximum in the range of green light, and one emits in the red range on the crystal UV light to obtain white light.

When the light source is a crystal UV light, the color tone may change. In accordance with the structure described above, the color tone as a whole averaged, and can be received light illuminator having essentially uniform color tone.

In figure 1, the mounting substrate 21 having five LEDs 22, placed at regular intervals on a straight line parallel to the longitudinal direction, and the mounting section is Delica 21, having eight LEDs 22, placed at regular intervals on a straight line parallel to the longitudinal direction, are installed next to be aligned in the longitudinal direction and are connected to each other via the connector 25. The connector 25 includes a plug half of the connector and the socket half of the connector. Half of the connector is attached to the edge of the mounting substrate 21 having five LEDs 22 and to the edge of the mounting substrate 21 having eight LEDs 22, respectively, with the edges facing each other. At least one of the halves of the connector protrudes from the edges of the mounting substrate 21, which are attached to one of the halves of the connector. This facilitates the connection between the two halves of the connector. It should be noted that in the shown figure 1 is a variant of realization, the two halves of the connector to protrude from the edges of the mounting substrate 21, respectively.

Many sets, each comprising a mounting substrate 21 having five LEDs 22, and the mounting substrate 21 having eight LEDs 22, connected to each other using the connector 25 is placed on the base 41 so as to be parallel to each other. The LEDs 22 on the mounting substrate 21 is placed in the direction of the long side of the base 41, that is, in the direction of the arrow X in figure 1. The sets, which each includes two mounting substrates 21, placed in the direction of the short side of the base 41, that is, in the direction of the arrow Y in figure 1. Therefore, the LEDs 22 are placed in the matrix. The mounting substrates 21 are attached to the base 41 by appropriate means, such as crimping, soldering, screwing or riveting.

Many of mounting substrates 21 are placed on the base 41, and the mounting substrate 21, which are adjacent, are connected to each other through the connector 25 and, thus, if prepared many kinds of mounting substrates 21 are different sizes, even when the blocks 49 backlight formed with different sizes by changing the kinds of mounting substrates 21 for the combination and connection of the mounting substrate 21 with each other using the connector 25, the installation can be performed easily. Therefore, there is no need to design specialized mounting substrate 21 for each block size 49 backlight, which contributes to cost reduction. In addition, among the mounting substrate 21, the ones that are aligned with each other in the longitudinal direction, are adjacent mounting substrates and, thus, by making many kinds of mounting substrates 21 of different lengths, in other words, having different number on the LEDs 22, the formation of the blocks 49 backlight with different times the apostrophes, installation can be performed easily.

Built-in reflective sheet 11 is placed between the mounting substrate 21 and the diffuser lens 24. Built-in reflective sheet 11 is set in position on the mounting surface 21U that faces the bottom surface of the diffusing lens 24. Optical reflectivity built-in reflective sheet 11 is higher than that of the mounting substrate 21. Built-in reflective sheet 11 is circular in form and concentric to the scattering of the lens 24. The diameter of the built-in reflective sheet 11 is greater than that of the scattering lens 24. A through hole for passage of each of the legs 24a of the scattering lens 24 formed in the built-in reflective sheet 11.

The reflective sheet 42, which form the form in terms similar to the base 41, overlaps the base 41. The reflective sheet 42 is a sheet of foamed polymer, which is similar to the built-in reflective sheet 11. External parts of the edges of the reflective sheet 42 is placed in the vertical wall 41b of the base 41, and the parts inside are inclined surfaces 42a, which are directed down to the main surface 41a of the base 41. The lower parts of the inclined surfaces 42a lead to the main plane 42b actually reflective sheet 42. The main item is accost 42b overrides the built-in reflective sheet 11.

A circular through hole 42H1 that are selected in size so that the scattering of the lens 24 can pass through them, and built-in reflective sheet 11 is not formed in the reflective sheet 42 in provisions, in line with the light emitting modules MJ. In addition, a rectangular through hole 42H2, through which are the connectors 25, also formed in the reflective sheet 42 in positions flush with the connectors 25.

The connectors 25 are visible through the through hole 42H2 and, thus, the optical reflectivity of the connectors 25 affect the brightness of the diffusing plate 43. Therefore, the connectors 25 are formed so that the areas that are visible from the outside when the mounting substrates 21 are connected to each other, had a bright color. More specifically, the connector 25 is attached to a bright color, such as white, ivory, or light gray, selection of material for their external sites, or staining them. This enhances the optical reflectivity of the connectors 25 and provides connectors 25 less absorption of light and, thus, uneven brightness on the diffusing plate 43 may be reduced.

When the LEDs 22 of the light emitted from the LEDs 22 of the light diffusing plate 43 with its rear surface. Light that does not directly fall on the Russ is yuushuu plate 43, reflected by the reflective sheet 42, or built-in reflective sheet 11, the scattering plate 43. Light scatters inside the scattering plate 43 and, thus, on the outer side of the diffusing plate 43 is shown as a plane, the brightness of which is relatively homogeneous.

The LEDs 22 can be adapted to a serial electrical connection with pairs of mounting substrates 21, connected to each other using the connector 25 in the block, or all non-hierarchical LEDs 22. This may cause that supplied to the respective LEDs 22 current may be the same, and the amount emitted from each of the LEDs 22 of the light can be uniform, and thus, uniformity of brightness on the diffusing plate 43 can be improved.

Each of the diffuser lens 24 has the shape of a body of rotation and the Central axis of rotation of a body is the optical axis OA. The optical axis OA is not orthogonal to the scattering plate 43, and tilted. The inclinations of the optical axes OA not the same, and diffuser lens 24 having different inclinations of the optical axes OA are mixed way by block 49 backlight.

With this structure, the optical axis OA does not necessarily have to be orthogonal to the scattering plate 43, and scattered in a particular direction, the light beams can the be mixed. As a result, regardless solely on methods of reducing the scattering direction of the lens 24, the degree of mixing of the light rays on the diffusing plate 43 is large, the property of the color mixing on the scattering plate 43 is improved, and the unevenness of luminance and the unevenness of the shades on the scattering plate 43 is reduced.

Dispersing lenses 24 are in pairs, in which the inclination of the optical axis OA of one of the diffuser lens 24 corresponds to the direction opposite to the direction of the optical axis OA of the other lenses, and such pairs are placed in the matrix. In the first variant of realization, one of the diffuser lens 24 on the mounting substrate 21 and one of the diffuser lens 24 on the adjacent mounting substrate 21, which are adjacent to each other, are combined in a pair.

Diffusing lens 24 having the optical axis OA, respectively, which are inclined in opposite directions, complement each other in brightness and colors. Such a pair of diffuser lenses 24 are placed in a matrix to form a planar light source and, thus, uneven brightness and uneven tones on the scattering plate 43 can be effectively reduced.

Diffuser lens 24, the optical axis OA which is inclined can be easily obtained by lengthening some of the centre of the BA legs 24a, and shortening others. The number of legs 24a may be equal to three, as shown in Figure 4(a), may be equal to four, as shown in Figure 4(b), or may be equal to five, as shown in Figure 4(c). The number of legs may be different from these values. Relative lengths of the legs 24a, referring to Figure 4, it may be that the legs 24a located on the left side relative to the center of the scattering lens 24, elongated, while the legs 24a located on the right side, shortened, and the opposite is also possible.

Diffusing lens 24 is attached to the mounting substrate 21 using Assembly and positioning devices (not shown). In this case, it is convenient if the Assembly of the positioning device can determine the orientation of the diffuser lens 24 (which is below). There are various ways in which it is possible to use Assembly-positioning device for determining the orientation of the scattering lens 24. Figure 5 shows examples of ways. In Figure 5, the protrusion 24b is formed on the side in which the diffuser lens 24 is lowered so that the mounting-positioning device can determine the direction of the scattering lens 24 by the recognition image. The protrusion 24b may be formed on the side on which the diffuser lens 24 is raised.

Figure 6 shows a block 49 of the rear illumination is in accordance with the second variant of realization of the present invention. In the second variant of realization, the pair scattering lens 24 having the optical axis OA, which are tilted in opposite directions, is not established between adjacent mounting substrates 21 are installed adjacent diffusing lens 24 on the same mounting substrate 21. The effects are the same as those for the first version of the implementation.

7 shows a block 49 backlight in accordance with a third variant of realization of the present invention. In the third implementation, four scattering lens 24, placed in the corners of the square, respectively, form one group. The direction of tilt of the optical axes OA of the four scattering lens 24 differ from each other by 90°. More specifically, in the plan, a number of inclinations of the optical axes OA form a loop. Such groups diffuser lenses 24 are placed in the matrix.

Four scattering lens 24, for which the directions of inclinations of the optical axes OA differ from one another by 90°, complement each other in brightness and colors. Such a pair of diffuser lenses 24 are placed in a matrix to form a planar light source and, thus, uneven brightness and uneven tones on the scattering plate 43 can be effectively reduced.

On Fig shows a block 49 backlight in accordance with the fourth alternative implementation the AI of the present invention. In the fourth implementation, four scattering lens 24, placed in the corners of the square, respectively, form one group. All four of the optical axis OA of the four diffuser lenses 24 are directed to the same point. One point is on the line, which rises perpendicularly from the center of the square. Such groups diffuser lenses 24 are placed in the matrix.

In the fourth implementation, four scattering lens 24, for which the directions of inclinations of the optical axes OA differ from one another by 90°, complement each other in brightness and colors. Such a pair of diffuser lenses 24 are placed in a matrix to form a planar light source and, thus, uneven brightness and uneven tones on the scattering plate 43 can be effectively reduced.

In the third embodiment, the implementation and the fourth implementation, the number of scattering lens 24 in the group is not limited to four and may be any number equal to three or more than three.

The location of the diffuser lens 24 in embodiments of from the first to the fourth not limited and can be appropriately combined with its execution.

Figure 9 shows an exemplary design of a television receiver, which includes the device 69 display. Television receiver 89 contents the t device 69 display and group 92 control boards 92 in the housing, which formed the front part of the body 90 and the rear part of the body 91. The housing is supported by a rack 93.

Considered above, the embodiments of the present invention, but the present invention is not limited, and can be made various modifications to implement the present invention without departing from the essence of the present invention.

Industrial applicability

The present invention is widely applicable to devices lights that illuminate the scattering plate light from the light source. In addition, the present invention is widely applicable to display devices, which include the above-mentioned illumination device, and television receiver, which includes the above display device.

The list of symbols

49 unit backlight

41 base

43 the scattering plate

MJ light-emitting module

11 built-in reflective sheet

21 mounting substrate

22 led

24 diffuser lens

24a leg

42 reflective sheet

OA optical axis

59 LCD panel display

69 the display device

89 TV receiver

1. The illumination device, comprising:
the scattering plate;
the reason to maintain a scattering plate; and
point the source of light, placed on the ground for the light scattering plate light,
moreover, the point light source includes a light emitting element mounted on the mounting substrate, and provided many point light sources, and each of the point light sources is covered by the lens, and lenses with different inclinations of the optical axes are mixed way, and
with lenses having optical axes which are inclined in opposite directions, paired, and the pairs are placed in the matrix.

2. The illumination device according to claim 1, in which each lens has the function of scattering light.

3. The illumination device according to claim 2, in which the function of scattering light is attached to the lens by processing for roughening their surface to the mounting substrate.

4. The illumination device according to claim 1, in which the light-emitting element includes an led.

5. The illumination device according to claim 4, in which the led is formed by coating a fluorescent material having an emission maximum in the range of yellow light, crystal, emitting blue light to obtain white light.

6. The illumination device according to claim 4, in which the led is formed by coating fluorescent materials, one of which has the emission maximum in the range of green light, the other has a maximum radiation of the range of red light, in the crystal, which emits blue light to obtain white light.

7. The illumination device according to claim 4, in which the led is formed by coating a fluorescent material having an emission maximum in the range of green light, crystal, emitting blue light, and join with him crystal, emitting a red light to obtain white light.

8. The illumination device according to claim 4, in which the led is formed by a combination of crystal, emitting blue light, crystal, emitting green light, and crystal, emitting a red light to obtain white light.

9. The illumination device according to claim 4, in which the led is a combination of crystals ultraviolet light and a fluorescent material.

10. The illumination device according to claim 9, in which the led is formed by applying fluorescent materials, one of which has the emission maximum in the range of blue light, the other has the emission maximum in the range of green light, and one has the emission maximum in the range of red light, crystal UV light to obtain white light.

11. The illumination device according to claim 1, wherein a set of point light sources placed on the mounting substrate, which has a shape with a longitudinal direction, and the mounting substrate is placed on the base.

12. The device podshock is according to item 11, wherein a set of point light sources are placed on a straight line parallel to the longitudinal direction of the mounting substrate.

13. The illumination device according to item 12, wherein a set of point light sources are placed on a straight line with uniform intervals.

14. The illumination device according to claim 11, wherein a set of mounting substrates placed on the base and adjacent the mounting substrate among a variety of mounting substrates are connected to each other using the connector.

15. The illumination device 14, in which the mounting substrate, which are aligned in the longitudinal direction, among a variety of mounting substrates are adjacent the mounting substrate.

16. The illumination device 14, in which the connector includes a combination of half of the connector attached to one of the adjacent mounting substrates, and half of the connector attached to the other of the adjacent mounting substrates, and at least one of the halves of the connector protrudes outward from the edges of the mounting substrate to which is attached one of the halves of the connector.

17. The illumination device 14, in which the connector includes an outer surface bright colors.

18. The illumination device according to claim 1, wherein a set of point light sources are electrically connected in series.

19. The device pods the weave contains
the scattering plate,
the reason to maintain a scattering plate, and
a point light source placed at the base to light scattering plate light,
moreover, the point light source includes a light emitting element mounted on the mounting substrate, and provided many point light sources, and each of the point light sources is covered by the lens, and lenses with different inclinations of the optical axes are mixed way, and
moreover, many of the lenses are grouped so that the number of tilt of the optical axis forms a loop, and groups are placed in the matrix.

20. The display device containing the illumination device according to any one of claims 1 to 18, and
a display panel that receives light from the illumination device.

21. The display device according to claim 20, in which the display panel includes a liquid crystal display panel.

22. A display device that contains
the illumination device according to claim 19, and
a display panel that receives light from the illumination device.

23. The display device according to item 22, in which the display panel includes a liquid crystal display panel.

24. Television receiver containing the display device according to claim 20.

25. Television receiver containing the display device according to item 22.



 

Same patents:

FIELD: electricity.

SUBSTANCE: working surface of a generating optical system, through which light diode emission is released, represents in the general case an asymmetric aspherical surface. The optical module according to the invention comprises a light diode (a light diode crystal) and an adjoining generating optical system (GOS), through which light diode emission is released. The working light-releasing surface of the GOS represents an asymmetric aspherical surface, at the same time the shape of the working surface of the GOS is determined from the solution of the suggested system of equations.

EFFECT: development of an optical module, providing for generation of required radiation indicatrix.

1 tbl, 3 dwg

FIELD: physics.

SUBSTANCE: obtained semiconductor radiators are designed for use in medical diagnosis equipment, environmental equipment for monitoring gaseous media, fibre-optic sensors for pressure, temperature, vibration and chemical analysis of substances, liquid and gas flow rate, in communication systems and control and measuring equipment. The method involves making a semiconductor radiator in which an end face opposite the output end of an active element is connected to an external spectrum-selective reflector based on a Bragg crystal lattice, having a series of alternating parallel layers of two types of semiconductor materials. The radiator can be superluminescent, laser single-element, multielement.

EFFECT: simple technology of manufacture owing to easier and faster assembly of elements of the radiator, high radiation power while maintaining stability of the wavelength and spectral width of the output radiation during change in ambient temperature and pumping current through the active crystal, longevity and high reliability, reduced size of the radiator and low production cost thereof.

9 cl, 1 dwg

Led module // 2503093

FIELD: physics.

SUBSTANCE: disclosed is a light source having a LED chip and a luminescent wavelength converter mounted side by side on a base. The LED chip is configured to emit excitation light in a first wavelength range, and the luminescent wavelength converter is configured to convert excitation light into converted light in a second wavelength range; a reflector with a built-in absorbing layer. The reflector is configured to transmit converted light from the luminescent wavelength converter, wherein the built-in absorbing layer is configured to reduce transmission by the reflector of any excitation light incident on the reflector at essentially oblique angles; and a separate hemispherical absorber, placed around the luminescent wavelength converter such that converted light from the luminescent wavelength converter passes through the separate hemispherical absorber at a normal angle of incidence, and excitation light transmitted through the reflector passes through the separate hemispherical absorber at an oblique angle. A light-emitting diode (LED) module is also disclosed.

EFFECT: simpler method of removing excitation light from light coming out of a source.

9 cl, 12 dwg, 2 tbl

FIELD: physics.

SUBSTANCE: light-emitting device (1) has a light-emitting diode (2) placed on a mounting substrate (3), said device having a lateral peripheral surface (6) and a top surface (8), and an optically active coating layer (7). Said coating layer (7) covers at least a part of said peripheral surface (6), extending from the mounting substrate (3) to said top surface (8), and essentially not covering the top surface (8). At least part of said lateral peripheral surface is pretreated to become either polar or non-polar. The coating composition used to form at least part of said coating layer is either polar or non-polar. Also disclosed are a method of making said device and an array of light-emitting devices consisting of said light-emitting devices.

EFFECT: reducing loss of efficiency due to scattering of light through lateral surfaces of the light-emitting device.

15 cl, 9 dwg

FIELD: radio engineering, communication.

SUBSTANCE: heterojunction structure according to the invention is a plurality of alternating pairs of narrow-bandgap (GaAs or GaN) and wide-bandgap (respectively, Ga1-x Alx As or Ga1-xAlxN) semiconductor layers. The thickness of the alternating narrow-bandgap and wide-bandgap layers is selected to be identical in the 30…100 nm range; the narrow-bandgap GaAs and GaN layers of the multilayer heterostructure are doped with donors to concentration of 5·1017…1·1018 cm-3 and the wide-bandgap Ga1-xAlxAs and Ga1-xAlxN layers are not doped; the number of periods of pairs of alternating GaAs and Ga1-x Alx As (and, respectively, GaN and Ga1-xAlxN) layers of the multilayer heterostructure is selected from three to several tens; the molar ratio of aluminium arsenide for all gallium arsenide - aluminium arsenide layers is selected in the range of 0.20…0.35, and the molar ratio of aluminium nitride for all gallium nitride - aluminium nitride layers is selected in the range of 0.35…0.65; wherein in the Ga1-x Alx As (for the GaAs-AlAs system) layer and in the Ga1-xAlxN (for the GaN-AIN system) layer from the pair furthest from the substrate, the molar ratio of aluminium arsenide (respectively, aluminium nitride) is low and is about 0.7·X, and the layer itself is coated with a thicker (not more than 150 nm) doped GaAs (respectively, GaN) layer. A version of the disclosed structure can be a structure in which in a layer of a solid solution from the pair closest to the substrate, the molar ratio of aluminium arsenide (respectively, aluminium nitride) is (0.65…0.75)·X.

EFFECT: significant increase in power of solid-state sub-terahertz and terahertz radiation generators.

2 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: lighting device 12 comprises multiple point sources 17 of light and a base 14, where point sources of light 17 are placed, which are classified into two or more colour ranges A, B and C, in accordance with light colours. Each colour range is defined by means of a square, each side of which has length equal to 0.01 in the colour schedule of light space of the International Lighting Commission 1931.

EFFECT: reproduction of light of practically even light.

26 cl, 15 dwg

FIELD: physics.

SUBSTANCE: method of making a light-emitting device according to the invention comprises the following steps: providing a light-emitting diode (LED) chip on a support (22), with a gap between the LED chip and the support, wherein the LED chip has a bottom surface facing the support and a top surface opposite the bottom surface; forming spacer material (54) on top of the LED chip such that the spacer material seals the LED chip and substantially completely fills the gap between the LED chip and the support, and removing the spacer material (54) at least from the top surface of the LED chip. The LED chip has epitaxial layers (10) that are grown on a growth substrate, wherein the surface of the growth substrate is the top surface of the LED chip. The method further includes a step of removing the growth substrate from the epitaxial layers after forming the spacer material (54) on top of the LED chip. Also disclosed is an intermediate method of making a light-emitting device, a light-emitting device before singulation, a light-emitting device having a flip chip.

EFFECT: using the invention to process on the wafer level multiple LEDs at the same time considerably shortens manufacturing time and enables to use a wide range of materials for the spacer since it allows for a wider range of viscosity.

16 cl, 7 dwg

FIELD: physics.

SUBSTANCE: invention relates to organic light-emitting diode (OLED) solid-state light sources used to make colour information screens and colour display devices with high consumer properties, as well as cheap and efficient light sources. Disclosed is an OLED, having a base in form of a transparent substrate having a transparent anode layer and a metal cathode layer with a light-emitting layer in between, which is based on a dendronised polyaryl silane of general formula (I) or (II) , where n is an integer from 5 to 1000.

EFFECT: wide range of OLEDs with high operational characteristics, particularly in the radiation range of 400-700 nm, which enables use thereof as light sources.

7 cl, 3 dwg, 6 ex

FIELD: physics.

SUBSTANCE: method comprises steps of: providing a substrate having at least one light-emitting diode (LED) and installing a collimator at least partially surrounding said at least one LED on one side, and formed by at least one self-supporting wall element made of material with thickness of 100-500 mcm. Said collimator is connected to said at least one LED and said substrate using a transmitting binding material. Also disclosed is a device made according to the described method.

EFFECT: easy manufacture of the light-emitting device.

10 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: disclosed is a yellow afterglow material having the chemical formula aY2O3·bAl2O3·cSiO2:mCe·nB·xNa·yP, where a. b. c. m, n. x and y are coefficients, where a is not less than 1 but not greater than 2, b not less than 2 but not greater than 3, c is not less than 0.001 but not greater than 1, m is not less than 0.0001 but not greater than 0.6, n is not less than 0.0001 but not greater than 0.5, x is not less than 0.0001 but not greater than 0.2, and y is not less than 0.0001 but not greater than 0.5, wherein Y, Al and Si are basic elements and Ce, B, Na and P are activators. Also disclosed is a method of producing the disclosed material and a light-emitting diode device using said material.

EFFECT: making alternating current light-emitting diodes from luminescent materials.

10 cl, 6 dwg, 4 tbl, 14 ex

FIELD: electricity.

SUBSTANCE: lighting device 12 comprises multiple point sources 17 of light and a base 14, where point sources of light 17 are placed, which are classified into two or more colour ranges A, B and C, in accordance with light colours. Each colour range is defined by means of a square, each side of which has length equal to 0.01 in the colour schedule of light space of the International Lighting Commission 1931.

EFFECT: reproduction of light of practically even light.

26 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: lighting device includes multiple LED 16, circuit board 17S LED, chassis 14, connection component 60 and reflecting plate 21. LED 16 are installed on circuit board 17S LED. Both plates 17S and 17C LED are attached to chassis 14. Connection component 60 is electrically connects circuit boards 17S and 17C LED between each other. Reflecting plate 21 is put on surface 17A of light sources installation. In the lighting device, connection component 60 is located on surface 17B of attachment of connection component of circuit board 17S LED. Surface 17B of attachment of connection device is opposite to the surface, on which reflecting plate 21 is put.

EFFECT: increasing brightness of reflected light.

23 cl, 22 dwg

FIELD: physics.

SUBSTANCE: device has a holder (11) which attaches a mounting plate (21) to a backlight base (41) while covering at least the edge (21S) of the mounting plate (21) on the backlight base (41), said edge being situated in the direction of the short side of the mounting plate. The surface of the mounting plate covered by the holder has a non-uniform reflection area which can be in form of a connector or a terminal.

EFFECT: improved uniformity of the amount of light from the backlight unit.

21 cl, 39 dwg

FIELD: electricity.

SUBSTANCE: back light unit (49) for display device (69) equipped with LCD panel (59) contains a frame (41), dissipating plate (43) supported by the frame and point light sources supported by mounting substrates (21) provided at the frame. Point light sources contain LEDs (22) installed at mounting substrates. Mounting substrates (21) are interconnected by connectors (25) thus forming rows (26) of mounting substrates (21). Varieties of rows (26) of mounting substrates (21) are located in parallel; a row (26) of mounting substrates (21) is formed by long and short mounting substrates (21) and location of such long and short mounting substrates (21) is changed to the opposite row-by-row. Positions of connectors (25) are not levelled in a straight line in direction of rows (26) of mounting substrates (21).

EFFECT: providing uniform brightness of the dissipating plate.

23 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: backlighting unit (49) for a display device (69) equipped with a liquid crystal display panel (59) comprises a base (41), a diffusing plate (43), supported by means of the base, and point sources of light, supported by means of mounting substrates (21), provided on the base. Point sources of light contain modules of light emission (MJ). Mounting substrates are arranged in the rectangular area (41a) suitable for location of mounting substrates in it and arranged on the base. Gaps at the borders between mounting substrates do not stretch in any direction along long sides and/or in direction along short sides of the rectangular area, in order to provide for the possibility to see the rectangular area from the edge to the edge.

EFFECT: achievement of homogeneity of reflection ratio.

16 cl

FIELD: physics.

SUBSTANCE: liquid crystal display device includes a first polariser, a second polariser facing the first polariser, a liquid crystal display panel provided between the first polariser and the second polariser, and a first phase plate and a second phase plate provided between the first or second polariser and the liquid crystal display panel. The display panel has a pair of substrates and a liquid crystal layer placed between the pair of substrates, which includes homogeneously aligned liquid crystal molecules. The phase plate includes a liquid crystal film placed in a position where the nematic liquid crystal is hybrid-aligned. Phase difference in the perpendicular direction of the element situated between the first and second polarisers, excluding the liquid crystal layer and the first phase plate, is 120 nm or greater.

EFFECT: reduced inversion of the gray gradation scale in a position where a colour close to black is displayed.

19 cl, 116 dwg

FIELD: physics.

SUBSTANCE: method of modulating optical radiation involves transmitting natural visible light in the wavelength range 350-850 nm at an angle of 5-75°, between the direction of the light and the perpendicular to the surface of the working optical element made from n layers of manganite A1-xBxMnO3 (where n≥1), wherein the trivalent rare-earth metal A is partially substituted with a univalent or divalent metal B with degree of substitution x. Visible light transmitted through and reflected from the working element is modulated under the effect of a control external magnetic field in which is located the working optical element, having giant visible light magnetotransmission and magnetoreflection effect.

EFFECT: wider range of methods of modulating optical radiation, simple design.

2 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: lighting device 12 includes light source 17, housing 14 containing light source 17 and hole 14b for passing of light emitted by light source 17 and optical element 15a provided so that to be directed to light source 17 and close hole 14b. Optical element 15a has various coefficient of reflection lengthwise to light source 17.

EFFECT: achievement of nearly even distribution of lighting brightness without partially formed dark parts.

12 cl, 27 dwg

FIELD: electricity.

SUBSTANCE: rear light unit (49) of display device (69) with liquid-crystal display panel (59) is provided with housing (41), diffusing plate (43) supported by housing, and light source located on housing (41) and emitting light on diffusing plate, and reflective sheet (42) for light reflection in diffusing plate direction. In peripheral part of reflective sheet (42) there formed is sloping surface (42a) reflecting light emitted sideward from the light source in direction of diffusing plate (43). This sloping surface (42a) of reflective sheet (42) is subject to treatment reducing reflection, which is achieved applying to sloping surface (42a) print with higher optical absorption constant, than it is of sloping surface (42a).

EFFECT: providing uniform brightness.

9 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: light-source unit includes a light-emitting diode 17 serving as a light source, diffuser lens 19, reflective sheet 23 of the board and a limiter 27. The diffuser lens 19 is faced towards emitting surface 17a of light emitted by the light-emitting diode 17. The reflective sheet 23 of the board is placed so that it is faced towards surface of the diffuser lens 19 which is located closer to the light-emitting diode 17 and configured for the purpose of light reflection. The limiter 27 protrudes from the diffuser lens 19 in direction of reflective sheet 23 of the board and it limits mutual alignment between the diffuser lens 19 and reflective sheet 23 of the board.

EFFECT: removing irregularity of the light emitted from the diffuser lens.

32 cl, 29 dwg

FIELD: electricity.

SUBSTANCE: lighting device 12 comprises multiple point sources 17 of light and a base 14, where point sources of light 17 are placed, which are classified into two or more colour ranges A, B and C, in accordance with light colours. Each colour range is defined by means of a square, each side of which has length equal to 0.01 in the colour schedule of light space of the International Lighting Commission 1931.

EFFECT: reproduction of light of practically even light.

26 cl, 15 dwg

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