Backlighting device, display device and tv receiver

FIELD: electricity.

SUBSTANCE: backlighting device (20) comprises a substrate (22), where multiple point sources of light are placed in the form of light diodes (21), and slots (23), which are also arranged on the substrate. Multiple point sources of light include the first point source of light (21), which is placed near the slot (23), and the second point source of light (21), which is placed in a position distant from the slot (23) compared to the first point source of light (21). The light beam in the surroundings of the slots is higher than the light beam in the area different from the surroundings of the slots.

EFFECT: reduced heterogeneity of brightness of a display panel without increase in number of process operations.

15 cl, 12 dwg

 

The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to a backlight device, display device and television receiver. More specifically, the invention relates to a backlight device, display device and television receiver, which includes a substrate on which the point light sources are mounted, and connectors that are provided on a substrate.

The LEVEL of TECHNOLOGY

Traditionally, as a backlight that supplies light to the display panel, a known backlight device that includes a substrate on which the point light sources are mounted, and connectors that are provided on the substrates.

Traditional backlight device includes: a variety of substrates, on which a set of LEDs (light-emitting diodes (point light sources)) are mounted; connectors, which are deposited on the substrate and which electrically connect the substrate; reflective elements, for example the reflective sheet placed in a predefined region on the substrate; and an optical plate, for example a light-diffusing plate placed on the light emitting side of the led. In the backlight device described above, many parts of the holes formed in artelinic elements and LEDs and connectors electrically connected to the substrate through these parts of the holes.

Here, since the reflectivity of the light surface of the connector, in General, lower than the reflectivity of the light reflective surface of the element, the loss of light is formed on the surface of the connector. In particular, the light that is emitted from the LEDs is reflected from the optical plate and which is reflected from the surface of the connectors, less light, which is emitted from the LEDs is reflected from the optical plate, and which is reflected from the reflective surface elements. Therefore, when viewed from the side of the display panel, the brightness of the parts of the connectors below the brightness of the parts other than the parts on the connector. Thus, the brightness of the display panel becomes unprofitable uneven.

Therefore, we offer a backlight device, which overcomes this problem (for example, see patent document 1).

Patent document 1 discloses a backlight device, comprising: a set of substrates with a layer of interconnects, in which a set of LEDs (point light sources) are mounted; connectors, which are deposited on the substrates with a layer interconnects and through which signals for the ignition of the LEDs can be inserted and removed; a reflective plate (otrajatelem the th element), which is placed on the substrate with a layer of interconnects; and a light-diffusing plate, which is placed on the light emitting side of the led.

Patent document 1 proposes such construction, as the construction in which the side holes for electrical connection of the LEDs to the substrate with a layer interconnects are formed in the reflective plate, and in which the reflective sheet is additionally provided so that it covers the surface of the connectors, and the construction in which the notches are formed in the reflective plate to provide a bent portion, and in which the bent portion is configured to cover the surface of the connectors.

In the backlight device of the patent document 1 reflective sheet is additionally provided so that it covers the surface of the connectors and bent part of the reflective plate configured to cover the surface of the connectors, and thereby it is possible to reduce the occurrence of loss of light on the surface of the connectors.

The DOCUMENTS of the PRIOR art,

Patent documents

Patent document 1. JP-A-2008-147147

The INVENTION

PROBLEM RESOLVED by the INVENTION of

However, when, as in the backlight device of the patent document 1, the reflective sheet is additionally provided with the AK, he covers the surface of the connectors, since it is necessary to glue the reflective sheet to each of the sockets, the number of technological operations increases unprofitable.

In addition, when the bent part of the reflective plate configured to cover the surface of the connectors, since it is necessary to bend the base part of the bent parts, mechanical stress is applied to the parts (basic parts), in which the bent part bent. Therefore, when the backlight device is used for a long period of time, the part in which the bent part bent, can be folded or deformed due to the surrounding temperature or the surrounding humidity conditions. In this case, since the surface of the connector is open, the loss of light is formed on the surface of the connectors, and thus the brightness of the display panel becomes unprofitable uneven.

The present invention is made to solve the above problem, the present invention is to provide a backlight device, display device and television receiver which can reduce the increase in the number of technological operations and which can reduce the heterogeneity of the brightness of the panel display.

A MEANS of dealing THE OIA PROBLEMS

In order to solve the above problem, according to the first aspect of the present invention provides a backlight device, comprising: a lot of point light sources; a substrate having one surface on which are mounted a point light source; and a connector, which is placed on one surface of the substrate, while the luminous flux in the vicinity of the connector, the light emitted from the point light sources, higher luminous flux, in a region other than the vicinity of the connector, the light emitted from the point light sources.

In the backlight device of the first aspect, as described above, since the light flux around the connectors can be set higher luminous flux in a region other than the vicinity of connectors, even if the loss of light is formed on the surface of the connectors, the loss of light, formed on the surface of the connectors can be compensated by the light flux around the connectors. Thus, when viewed from the side of the display panel, it is possible to reduce the decrease in the brightness of the parts of the connector compared to the brightness of the parts other than the parts of the connector, and thereby it is possible to reduce the nonuniformity of brightness of the panel display.

In the backlight device of the first aspect, as described above, since it is not necessary to additionally provide otrajat the local sheet, covering the surface of the connectors in order to reduce the heterogeneity of the brightness of the display panel, it is possible to reduce the increase in the number of technological operations.

In the backlight device of the first aspect, as described above, is not necessary to provide a bent portion in the reflective element in order to reduce the heterogeneity of the brightness of the display panel, and place the bent portion so that the bent part covered the surface of the connectors. Thus, even when the backlight device is used for a long period of time, since it is possible to prevent folding or deformation of the reflective element, it is possible to reduce the nonuniformity of brightness of the panel display.

Preferably, in the backlight device of the first aspect, the point light sources include a first point light source, which is located next to the connector, and the second point light source, which is located at a position remote from the connector compared to the first point light source and the light flux emitted from the first point source of light above the light flux emitted from the second point source of light. In this configuration, because you can easily set luminous flux around the connectors above the light flux in a region different from the surrounding area RA is yemov, you can easily reduce the heterogeneity of the brightness of the panel display.

Preferably, in the backlight device, in which the point light sources include a first point light source and the second point light source, the current flowing through the first point light source exceeds the current flowing through the second point light source. In this configuration, because you can easily set the amount of light emitted from the first point source of light above the light flux emitted from the second light source, you can easily reduce the heterogeneity of the brightness of the panel display.

Preferably, in the backlight device, in which the point light sources include a first point light source and the second point light source, the light output of the first point source of light above the light output of the second point light source. In this configuration, because you can easily set the amount of light emitted from the first point source of light above the light flux emitted from the second light source, you can easily reduce the heterogeneity of the brightness of the panel display.

Preferably, in the backlight device of the first aspect, the density of point light sources located in the vicinity of the connector, the higher density of point sources of light, RA is displaced in the area, other than the neighborhood of the connector. In this configuration, because you can easily set luminous flux around the connectors above the light flux in a region other than the vicinity of connectors, you can easily reduce the heterogeneity of the brightness of the panel display.

Preferably, in the backlight device, in which the density of point light sources located in the vicinity of the connector is higher than the density of point light sources placed in a region other than the vicinity of the connector, the point light sources include a first point light source, which is located next to the connector, and the second point light source, which is located at a position remote from the connector compared to the first point light source, a wide range of substrates, and the distance between the first point light sources on adjacent substrates is less than the distance between the first point light source and the second point light source on one of the substrates. In this configuration, because you can easily set the density of point light sources located in the vicinity of the connector is higher than the density of point light sources placed in a region other than the vicinity of the connector, you can easily reduce the heterogeneity of the brightness of the panel display.

Preferably, in the backlight device PE the first aspect, the reflective element is provided in a predetermined region on one surface of the substrate. In this configuration, you can easily increase the efficiency of use of light.

In the backlight device of the first aspect, the point light sources can be accommodated in the longitudinal direction of the substrate.

Preferably, in the backlight device, in which the substrate has a rectangular shape when viewed in top view, a point light source placed on one of the substrates in the longitudinal direction of the substrate with an identical step. In this configuration, it is possible to additionally reduce the heterogeneity of the brightness of the panel display.

In the backlight device, in which the substrate has a rectangular shape when viewed in top view, the connector can be placed on the end of the substrate in the longitudinal direction, and the set of substrates can be placed along the longitudinal direction.

Preferably, in the backlight device of the first aspect, the set of substrates is provided, and a connector electrically connects the adjacent substrate. In this configuration, it is easy to electrically connect the set of substrates sequentially or in parallel.

Preferably, in the backlight device of the first aspect, a point light source is a light emitting diode. This is the configuration you can increase the lifespan of a point source of light and to reduce the power consumption of a point source of light.

Preferably, in the backlight device of the first aspect, many light-diffusing lenses are provided so that they cover to cover many point light sources, respectively. In this configuration, since it is possible to diffuse light emitted from the point light sources, you can further reduce the heterogeneity of the brightness of the panel display.

The display device according to the second aspect of the present invention includes: a backlight device made as described above; and a display panel that is illuminated by the backlight device. In this configuration, it is possible to obtain a display device that can prevent increase in the number of technological operations, and which can reduce the heterogeneity of the brightness of the panel display.

Preferably, in the display device of the second aspect, the display panel includes a liquid crystal display panel. In this configuration, it is possible to obtain a liquid crystal display device, which can prevent increase in the number of technological operations, and which can reduce the heterogeneity of the brightness of the panel display.

The television receiver according to a third aspect of the present invention includes: a display device made as described above; a casing that holds the display device; a tuner; and speaker. In this configuration, it is possible to obtain a television receiver which can prevent increase in the number of technological operations, and which can reduce the heterogeneity of the brightness of the panel display.

Advantages of the INVENTION

As described above, according to the present invention can easily obtain a backlight device, display device and television receiver, which can prevent increase in the number of technological operations, and which can reduce the heterogeneity of the brightness of the panel display.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is an exploded view in perspective showing the overall configuration of the liquid crystal television receiver, comprising the backlight device according to the first variant implementation of the present invention;

Figure 2 is an exploded view in perspective showing the construction of the liquid crystal display device comprising the backlight device shown in figure 1, according to the first variant implementation of the present invention;

3 are the two which is a view in cross-section, showing a structure over the substrate of the backlight device shown in figure 1, according to the first variant implementation of the present invention;

Figure 4 is a view in cross section showing the construction in example 1, corresponding to the first variant implementation of the present invention;

Figure 5 is a diagram showing the characteristic of the brightness of light in A direction passing through the liquid crystal display panel of example 1, corresponding to the first variant implementation of the present invention;

6 is a diagram showing the characteristic of the brightness of light in A direction passing through the liquid crystal display panel of comparative example 1;

Fig.7 are the image data obtained by shooting a liquid crystal display panel of example 2, corresponding to the first variant implementation of the present invention;

Fig are the image data obtained by shooting a liquid crystal display panel of comparative example 2;

Fig.9 is a view in cross section showing the structure over the substrate of the backlight device according to the second variant of implementation of the present invention;

Figure 10 is a view in cross section showing the structure, the Oia in example 3, corresponding to the second variant of implementation of the present invention;

11 is a diagram showing the characteristic of the brightness of light in A direction passing through the liquid crystal display panel of example 3, corresponding to the second variant of implementation of the present invention; and

Fig are the image data obtained by shooting a liquid crystal display panel of example 4, corresponding to the second variant of implementation of the present invention.

The best MODE of carrying out the INVENTION

Embodiments of the present invention are described below with reference to the accompanying drawings.

The first option exercise

It describes the design of the liquid crystal television receiver 1 includes a device 20 of the backlight according to the first variant implementation of the present invention, with reference to Figures 1-3. The liquid crystal television receiver 1 is an example of a television receiver of the present invention.

As shown in figure 1, the liquid crystal television receiver 1 includes a device 20 of the backlight according to the first variant implementation of the present invention includes: the liquid crystal display device 10, including the impact device 20 backlight; the front cover 2 and the rear casing 3, which hold the liquid crystal display device 10; speaker 4 attached to the front casing 2; tuner 5; source 6 power supply; and a support element 7. Since the traditional common components can be applied to the front housing 2, the rear casing 3, the dynamics of 4, the tuner 5, the power source 6 and the supporting element 7, and are described briefly. The liquid crystal display device 10 is an example of a "display device" of the present invention; front cover 2 and the rear cover 3 are an example of "casing" of the present invention.

The front cover 2 and the rear housing 3 to hold the liquid crystal display device 10, the tuner 5 and the power source 6. Tuner 5 has the function of forming the image signal and sound signals of a predetermined channel from the received radio waves. Speaker 4 has the function of generating sound based on the sound signals generated by the tuner 5. Source 6 power supply configured to supply power to the liquid crystal display device 10, the speaker 4 and the tuner 5. The liquid crystal display device 10 is supported by the support element 7. Speaker 4, the tuner 5 and the power source 6 may be included in the liquid crystal display device 10.

As shown the and Figure 2, the liquid crystal display device 10 is formed with: holder 11 in the form of a frame; a liquid crystal display panel 12, the perimeter of which is covered by the holder 11; and a device 20 backlight, which is placed on the back surface of the liquid crystal display panel 12. The liquid crystal display panel 12 is an example of a "display panel" of the present invention.

The liquid crystal display panel 12 includes an AM substrate (wafer based active matrix) 12a and the opposite substrate 12b, which is located opposite the AM substrate 12a. Liquid crystal (not shown) sealed between the AM substrate 12a and the opposing substrate 12b. The liquid crystal display panel 12 is illuminated by the device 20 backlight so that it acts as the display panel.

The device 20 backlight includes: a variety of substrate 22, on which a set of LEDs 21 are mounted; and a connector 23, which connect adjacent substrate 22, for example, sequentially; a reflective sheet 24, which is located on the side of the front surface 22a of the substrate 22; a light-diffusing plate 25 and a plurality of optical plates 26, which are arranged on the side of the front surface of the reflective sheet 24; and pyreneeses 27 and the rear of the chassis 28, keeping these components. The led 21 is an example of a "point light" and "light emitting diode" of the present invention; the front surface 22a is an example of the "one surface" of the present invention. The reflective sheet 24 is an example of the reflective element of the present invention.

The substrate 22 has a rectangular shape when viewed in top view. For example, three substrate of the substrates 22 are placed along the longitudinal direction of the substrate 22, and, for example, five of the substrates 22 are placed in the transverse direction of the substrate 22. In the following description, the longitudinal direction of the substrate 22 is referred to as a direction and a transverse direction of the substrate 22 is referred to as direction B.

As shown in Figure 3, the front surface 22a of the substrate 22, is mounted a set of LEDs 21 and plenty of connectors 23. Connector 23 is attached to the end, placed opposite to the substrate 22 adjacent in the direction A, from the ends of the substrate 22 in the direction A. a Pair of connectors 23 adjacent to each other are connected to each other and connect the connecting substrate 22 is physically and electrically. Reflectivity of light parting surface 23 of the lower reflectivity of the light reflective surface of the sheet 24 (see Figure 2).

The substrate 22 is made so that the current (power) is supplied to instructiona the the LEDs 21 to emit light.

For example, three of the LEDs 21 are placed on the front surface 22a of each of the substrates 22 in the direction A. the LEDs 21 are formed so that they emit light to the front side (the side of the light diffusing plate 25). Each of the LEDs 21 contains light diffusing lens 29, which has the function of scattering light, so light diffusing lens 29 closes the led 21. A light-diffusing lens 29 is formed, for example, of a transparent resin.

Here, in the first embodiment, for example, three of the LEDs 21 mounted on one of the substrates 22 are placed with a predefined step (P1). In other words, three of the LEDs 21 are placed on one of the substrates 22 with identical step in the direction of A.

The LEDs 21 include LEDs 21a, which are placed next to the connector 23, and the led 21b, which are arranged in positions remote from the connectors 23 in comparison with LEDs 21a.

In the first embodiment, the distance between the LEDs 21a adjacent the substrate 22 is equal to the distance between the led 21a and the led 21b on one of the substrates 22. In other words, all the LEDs 21 mounted on three of the substrates 22, placed in the direction A, are identical with step (P1). The led 21a is an example of the first point light source" of the present invention; SV is todid 21b is an example of the second point light source" of the present invention.

The led 21 is formed, for example, by using a blue light-emitting element and a fluorescent element, which converts part of the blue light emitted from blue light-emitting element, in the yellow light, blue light and yellow light are mixed to each other so that they provide white light.

The led 21 can be formed, for example, by using a blue light-emitting element and a fluorescent element, which converts part of the blue light emitted from blue light-emitting element, a red light and green light, blue light, red light and green light can be mixed together so that they provide white light.

The led 21 can be formed, for example, by using a blue light-emitting element, the fluorescent element, which is located on the blue light emitting element and which converts some of the blue light into green light and red light-emitting element, a blue light, green light and red light can be mixed together so that they provide white light.

The led 21 can be formed, for example, with ultraviolet light-emitting element and a fluorescent element, which converts the ultraviolet light into blue light, green light and red light.

In the first embodiment, the light flux LA, which is sluchaetsa of the LEDs 21a, placed next to the connector 23, above the light flux LB, which is emitted from the led 21b placed at the position remote from the connector 23 in comparison with the led 21a. In particular, the relationship of "LA/LB = approximately 1,05-1,10" preferably is satisfied between the light flux LA emitted from the led 21a and the light flux LB emitted from the led 21b.

For example, the current flowing through the led 21a is set above the current flowing through the led 21b, and thus you can easily set the light flux LA emitted from the LEDs 21a, above the light flux LB emitted from the led 21b.

As LEDs 21a, posted to the connector 23, the led 21, which has a higher light output light output of the led 21b is used, and thereby, it is possible to easily set the light flux LA emitted from the LEDs 21a, above the light flux LB emitted from the led 21b. In this case, since the current which passes through the led 21a may be set equal to the current that passes through the led 21b, it is possible to prevent the complication of the circuit configuration.

As LEDs 21a, the led 21, which has a higher light output light output of the led 21b, may be used, and the current, which flows through the led 21a may be set higher than the current that passes through the led 21b.

As shown in figure 2 I3, the reflective sheet 24 is placed in a predefined region on the front surface 22a of the substrate 22. The reflective sheet 24 is formed, for example, from white resin and has a reflection function, to the front side (the side of the light diffusing plate 25), light that is emitted from the LEDs 21 and which is reflected from the light-diffusing plate 25, etc.

In the reflective sheet 24, is formed in many parts 24a of holes, through which are inserted the LEDs 21 and a light-diffusing lens 29, and a lot of parts 24b of holes, through which are inserted into the connectors 23. Part 24a hole is formed so that it has an internal diameter slightly larger than the outer diameter of the light diffusing lens 29. Part 24b of the hole is formed so that it has a hole slightly larger than the outer shape of a pair of connectors 23 next to each other.

A light-diffusing plate 25 has a function to reflect part of light emitted from the LEDs 21 to the side of the reflective sheet 24, and passing the remaining light emitted from the LEDs 21 to the side of the liquid crystal display panel 12 (the side of the optical plate 26).

Optical plate 26 (see Figure 2) are formed using prismatic plates, lens plates, etc. and have the function of collecting light passing through the light diffusing plate 25, under pre is sustained fashion in a certain angle.

The front of the chassis 27 and the rear of the chassis 28 (see Figure 2) are formed from resin. The front of the chassis 27 and the rear of the chassis 28 may be formed from metal.

In the first embodiment, as described above, the amount of light LA emitted from the LEDs 21a, set above the light flux LB emitted from the led 21b, and thereby it is possible to set the luminous flux around the connectors 23 above the light flux in a region other than the vicinity of the connectors 23. Here, since the reflectivity of light parting surface 23 of the lower reflectivity of the light reflective surface of the sheet 24, the loss of light is formed on the surface of the connectors 23. However, since, in the first embodiment, the luminous flux around the connectors 23 can be set higher luminous flux in a region other than the vicinity of the connectors 23, even if the loss of light is formed on the surface of the connectors 23, loss of light, formed on the surface of the connectors 23 can be compensated by the light flux around the connectors 23. Thus, when viewed from the side of the liquid crystal display panel 12, it is possible to reduce the decrease in the brightness of the parts of the connectors 23 in comparison with the brightness of parts other than the parts of the connectors 23, and thereby, it is possible to reduce the nonuniformity of brightness of the liquid crystal display panel 12.

Because, per the om embodiment, as described above, is not necessary to additionally provide a reflective sheet covering the surface of the connectors 23 in order to reduce the heterogeneity of the brightness of the liquid crystal display panel 12, it is possible to reduce the increase in the number of technological operations.

In the first embodiment, as described above, is not necessary to provide a bent portion in the reflective sheet 24 in order to reduce the heterogeneity of the brightness of the liquid crystal display panel 12, and place the bent portion so that the bent part of the surface is covered with connectors 23. Thus, even when the device 20 backlight used for a long period of time, since it is possible to prevent folding or deformation of the reflective sheet 24, it is possible to reduce the nonuniformity of brightness of the liquid crystal display panel 12.

In the first embodiment, as described above, the current flowing through the led 21a is set above the current flowing through the led 21b, and thus you can easily set the light flux LA emitted from the LEDs 21a, above the light flux LB emitted from the led 21b.

In the first embodiment, as described above, the light output of the led 21a is set higher lumen output of the led 21b, and thus you can easily set the light flux LA emitted from the light the iodine 21a, above the light flux LB emitted from the led 21b.

In the first embodiment, as described above, the LEDs 21 are placed on one of the substrates 22 with identical step in the direction A, and thus can further reduce the heterogeneity of the brightness of the liquid crystal display panel 12.

In the first embodiment, as described above, as a point light source, light emitting diode (led 21 is used, and thereby it is possible to increase the lifetime of a point light source (LEDs 21) and to reduce the power consumption of a point light source (LEDs 21).

As in the first embodiment, as described above, a light-diffusing lens 29 are provided so that they cover the LEDs 21, and thereby, it is possible to diffuse light emitted from the LEDs 21 can further reduce the heterogeneity of the brightness of the liquid crystal display panel 12.

The following describes an experiment performed to confirm the effects described above with reference to Figure 4-8.

This confirmation experiment used the examples 1 and 2, corresponding to the first variant implementation, and comparative examples 1 and 2. In example 1, corresponding to the first variant implementation, and comparative example 1. the brightness of the light, towards the attachment A, passing through the liquid crystal display panel 12, determined through simulation. In example 2, corresponding to the first variant implementation, and comparative example 2, the characteristic of the brightness of light in the plane passing through the liquid crystal display panel 12 (the characteristic of the brightness in the direction A and direction B), determined through simulation.

It describes the modeling, which is used to determine the characteristic of the brightness of light in A direction passing through the liquid crystal display panel 12.

In example 1, as shown in Figure 4, the two substrates 22 are connected in the direction A. On each of the substrates 22 are mounted two LEDs 21. All (four) LEDs 21 mounted on the two substrates 22 posted with the same step. The relationship of "LA/LB = 1,05" is satisfied between the light flux LA emitted from the LEDs 21a, which is located next to the connector 23, and the light flux LB emitted from the led 21b, which is located at a position remote from the connector 23 in comparison with the led 21a. In a confirmatory experiment, a light-diffusing lens 29 is not supplied to the LEDs 21.

In comparative example 1, the amount of light LA emitted from the LEDs 21a, which is located next to the connector 23, and the light flux LB) is required from the led 21b, which is located at a position remote from the connector 23 in comparison with the led 21a, are equal to each other. Other designs in comparative example 1 are identical to the structures in example 1.

In example 1 and comparative example 1, the characteristic of the brightness of light in A direction passing through the light diffusing plate 25 and the liquid crystal display panel 12, determined through simulation. The results are shown in Figure 5 and 6, respectively.

With reference to Figure 5 and 6 demonstrated that, in example 1, compared with comparative example 1, it is possible to reduce the dimming area above the connectors 23 and to reduce the heterogeneity of the brightness of the liquid crystal display panel 12. This is probably due to the fact that in example 1, the amount of light LA emitted from the LEDs 21a, set above the light flux LB emitted from the led 21b, and thus the loss of light, formed on the surface of the connectors 23 can be compensated by means of the light flux emitted from the LEDs 21a.

The following describes the modeling, which is used to determine the characteristic of the brightness of light in the plane passing through the liquid crystal display panel 12.

In example 2, three substrate 22 are connected in the direction A. In example 2, similarly to example 1, the relationship of "LA/LB= 1,05" is satisfied between the light flux LA, emitted from the led 21a and the light flux LB emitted from the led 21b. Other designs in example 2 are identical to the structures in example 1.

In comparative example 2, the amount of light LA emitted from the led 21a and the light flux LB emitted from the led 21b, are equal to each other. Other designs in comparative example 2 are identical to the structures in example 2.

In example 2 and comparative example 2, the characteristic of the brightness of light in the plane passing through the light diffusing plate 25 and the liquid crystal display panel 12, determined through simulation. The results of this are shown in Fig.7 and 8, respectively. Fig.7 and 8 show the image data obtained by shooting a liquid crystal display panel 12; a portion of which brightness is high, painted white, compared with a part of which brightness is low.

With reference to Fig.7 and 8, demonstrated that, in example 2, as compared with comparative example 2, it is possible to reduce the dimming area above the connectors 23. In particular, in comparative example 2, the dark line appears on parts of the connectors 23 of the liquid crystal display panel 12, while, in example 2, the dark line does not appear on the parts of the connector 23 of the liquid crystal display panel 12. This is o f due to the fact that in example 2 analogously to example 1, the amount of light LA emitted from the LEDs 21a, set above the light flux LB emitted from the led 21b, and thus the loss of light, formed on the surface of the connectors 23 can be compensated by means of the light flux emitted from the LEDs 21a.

The second option exercise

In the second embodiment, unlike the first variant implementation, the case when the density of the LEDs 121, placed around the connectors 23 increases, is described with reference to Fig.9.

In the backlight device according to the second variant of implementation of the present invention, as shown in Fig.9, the front surfaces 122a of the substrate 122 is mounted a set of LEDs 121 and plenty of connectors 23. The front surface 122a is an example of the "one surface" of the present invention. The led 121 is an example of a "point light" and "light emitting diode" of the present invention.

Here, in the second embodiment, for example, three of the LEDs 121 mounted on one of the substrates 122 are placed with a predefined step (P11). In other words, three of the LEDs 121 are placed on one of the substrates 122 with identical step in the direction of A.

In the second embodiment, the distance between what metadidomi 121a, of LEDs 121, which are placed next to the connectors 23, less than the distance between the led 21a and the led 121b, which is located at a position remote from the connector 23 in comparison with led 121a. In other words, step (P12) between the LEDs 121a on adjacent substrates 122 is less than the step (P11) between the led 121a and led 121b. Thus, the density of the LEDs 121, placed around the connectors 23, higher density of LEDs 121, placed in the region other than the vicinity of the connectors 23. Correlation P12/P11 = approximately 0,93-0,98" preferably satisfied between step (P12) between the LEDs 121a and step (P11) between the led 121a and led 121b. Led 121a is an example of the first point light source" of the present invention; led 121b is an example of the second point light source" of the present invention.

In the second embodiment, the amount of light emitted from the LEDs 121a, equal to the luminous flux emitted from the led 121b.

Other structures of the second variant of implementation are identical to the structures of the first variant implementation.

In the second embodiment, as described above, the density of the LEDs 121, placed around the connector 23 is set higher than the density of the LEDs 121, placed in the region other than the vicinity of the connectors 23, and the fact itself is m can easily be set luminous flux around the connectors 23 above the light flux in the field, other than the neighborhood of the connectors 23. Thus, even if the loss of light is formed on the surface of the connectors 23, because, when viewed from the side of the liquid crystal display panel 12, it is easy to avoid decreasing the brightness of the parts of the connector 23 to a value lower than the brightness of the parts other than the parts of the connectors 23, it is possible to reduce the nonuniformity of brightness of the liquid crystal display panel 12.

In the second embodiment, as described above, the distance between the LEDs 121a on adjacent substrates 122 is set smaller than the distance between the led 121a and led 121b, and thus you can easily set the density of the LEDs 121, placed around the connectors 23, higher density of LEDs 121, placed in the region other than the vicinity of the connectors 23. Therefore, you can easily reduce the heterogeneity of the brightness of the liquid crystal display panel 12.

Other effects in the second embodiment are identical to the effects in the first embodiment.

The following describes an experiment performed to confirm the effects described above with reference to Figure 10-12.

This confirmation experiment, use of examples 3 and 4, corresponding to the second variant of implementation. In example 3, corresponding to the second variant implementation, the characteristics of the and the brightness of the light, in A direction passing through the liquid crystal display panel 12, determined through simulation. In example 4, corresponding to the second variant implementation, the characteristic of the brightness of light in the plane passing through the liquid crystal display panel 12 (the characteristic of the brightness in the direction A and direction B), determined through simulation.

It describes the modeling, which is used to determine the characteristic of the brightness of light in A direction passing through the liquid crystal display panel 12.

In example 3, as shown in Figure 10, two substrate 122 is connected to the direction A. each of the substrates 122 are mounted two LEDs 121. Step (P22) between the LEDs 121a less step (P21) between the led 121a and led 121b. In particular, the relationship P22/P21 = 0,95" is satisfied between step (P22) between the LEDs 121a and step (P21) between the led 121a and led 121b. The amount of light emitted from the LEDs 121a, equal to the luminous flux emitted from the led 121b. In a confirmatory experiment, a light-diffusing lens 29 is not provided on the LEDs 121.

In example 3, the characteristic of the brightness of light in A direction passing through the light diffusing plate 25 and the liquid crystal display panel 12, is defined by the fashion of the financing. The result of this is shown figure 11.

With reference to 11, demonstrated that, in example 3, it is possible to reduce the dimming area above the connectors 23 and to reduce the heterogeneity of the brightness of the liquid crystal display panel 12. This is probably due to the fact that in the example 3, since the density of the LEDs 121, placed around the connector 23 is set higher than the density of the LEDs 121, placed in the region other than the vicinity of the connectors 23, and thereby, it is possible to set the luminous flux around the connectors 23 above the light flux in a region other than the vicinity of the connectors 23, loss of light, formed on the surface of the connectors 23 can be compensated.

The following describes the modeling, which is used to determine the characteristic of the brightness of light in the plane passing through the liquid crystal display panel 12.

In example 4, three substrate 122 is connected in the direction A. In example 4, similarly to example 3, the relationship P22/P21 = 0,95" is satisfied between step (P22) between the LEDs 121a and step (P21) between the led 121a and led 121b. The amount of light emitted from the LEDs 121a, equal to the luminous flux emitted from the led 121b. Other designs in example 4 are identical to the structures in example 3.

In example 4, the characteristic of the brightness of light in the plane passing che the ez light-diffusing plate 25 and the liquid crystal display panel 12, determined through simulation. The result is shown in Fig.

With reference to Fig demonstrated that, in example 4, as compared with comparative example 2, it is possible to reduce the dimming area above the connectors 23. In particular, in example 4, the dark line does not appear on the parts of the connector 23 of the liquid crystal display panel 12. This is probably due to the fact that in example 4 analogously to example 3, since the density of the LEDs 121, placed around the connector 23 is set higher than the density of the LEDs 121, placed in the region other than the vicinity of the connectors 23, and thereby, it is possible to set the luminous flux around the connectors 23 above the light flux in a region other than the vicinity of the connectors 23, loss of light, formed on the surface of the connectors 23 can be compensated.

It should be considered that the embodiments of and examples disclosed herein are in all respects illustrative and not restrictive. Scope of the present invention is indicated not by the description of embodiments and examples that are explained above, but through the scope of the claims, and in addition, the value equivalent to the amount of the claims, and all modifications within the scope are included.

For example, although embodiments of the implementation described above, the illustrated example, to the Thor panel display, the display device and television receiver are applied in the liquid crystal display panel, a liquid crystal display device and liquid crystal television receiver, respectively, the present invention is not limited to this example. Display panel, display device and television receiver can be used in the display panel, display device and television receiver other than the liquid crystal display panel, the liquid crystal display device and liquid crystal television receiver.

Although variants of the implementation described above is explained an example in which the led is used as a point light source, the present invention is not limited to this example. For example, a point light source other than an led, for example, the semiconductor laser element can be used.

Although in the embodiments and examples described above, is explained an example in which two or three of the LEDs are mounted on each of the substrates, the present invention is not limited to this example. Four or more of the LEDs can be mounted on one of the substrates.

Although variants of the implementation described above is explained an example in which the led is configured to emit b is ly light, the present invention is not limited to this example. The led can be made with the ability to emit light other than white light.

Although variants of the implementation described above is explained an example in which the led is formed by using a light-emitting element and a fluorescent element, the present invention is not limited to this example. For example, instead of using luminescent element, the led may be formed using a blue light-emitting element, a red light-emitting element and the green light-emitting element.

Although variants of the implementation described above is explained an example in which the LEDs are mounted in a row, the present invention is not limited to this example. The LEDs can be mounted in multiple rows on each of the substrates.

Although variants of the implementation described above is explained an example in which a light-diffusing lens is provided so that it covers the led, the present invention is not limited to this example. A light-diffusing lens covering the led does not need to be provided.

Although variants of the implementation described above is explained an example in which the connector is provided on the end of the substrate, the present invention is not limited to this example. The present invention can be applied to is the best, which connector is provided at the position other than the end of the substrate.

Although variants of the implementation described above is explained an example in which the set of substrates are provided, the present invention is not limited to this example. The present invention can be applied to the case in which is only one substrate.

Although variants of the implementation described above is explained an example that uses a connector electrically connecting the adjacent substrate, the present invention is not limited to this example. The connector that connects the substrate and the element that is different from the substrate, can be used.

Although in the first embodiment, explained is an example in which the amount of light emitted from the LEDs 21a, set above the light flux emitted from the led 21b, and the second embodiment explained the example in which the density of LEDs placed around the connectors, set higher density of LEDs, placed in the region other than the vicinity of connectors, the present invention is not limited to these examples. The amount of light emitted from the led 21a may be set above the light flux emitted from the led 21b, and the density of LEDs placed around the connectors, can be set higher than the density of the LEDs, placed in the region other than OCD the particular connectors.

Although in the first embodiment, explained is an example in which the relationship "LA/LB = approximately 1,05-1,10" is satisfied between the light flux LA emitted from the led 21a and the light flux LB emitted from the led 21b, the present invention is not limited to this example. Provided that the light flux LA above the light flux LB, correlation LA/LB = approximately 1,05-1,10" may not be satisfied between the light flux LA and the light flux LB.

Although in the second embodiment explained the example in which the relationship P12/P11 = approximately 0,93-0,98" is satisfied between step (P12) between the LEDs 121a and step (P11) between the led 121a and led 121b, the present invention is not limited to this example. Provided that step (P12) between the LEDs 121a less step (P11) between the led 121a and led 121b, the relationship P12/P11 = approximately 0,93-0,98" may not be satisfied between step (P12) and step (P11).

Although in the second embodiment, explained is an example in which the distance between the LEDs 121a on adjacent substrates 122 is set smaller than the distance between the led 121a and led 121b, and thereby the density of the LEDs 121, placed around the connector 23 is set higher than the density of the LEDs 121, placed in the region other than the vicinity of the connectors 23, the present invention is not limited to this exampl is. By placing at least LEDs 121a in multiple rows so that the number of LEDs 121a in the direction of B is greater than the number of LEDs 121b in the direction B, the density of the LEDs 121, placed around the connectors 23 may be set higher than the density of the LEDs 121, placed in the region other than the vicinity of the connectors 23.

The LIST of POSITIONAL NOTATION

1 - liquid crystal television receiver (TV receiver)

2 - front hood (bonnet)

3 - rear hood (bonnet)

4 - speaker

5 tuner

10 - liquid crystal display device (display device)

12 is a liquid crystal display panel (display panel)

20 - device backlight

21 and 121 - LEDs (point light source, light-emitting diode)

21a and 121a - led (the first point light source)

21b and 121b - led (the second point light source)

22 and 122 - substrate

22a and 122a - front surface (one surface)

23 - Jack

24 - reflective plate (reflection element)

29 is a light-diffusing lens

1. The backlight device containing multiple point sources of light,
a substrate having one surface on which are mounted a point light source, and
connector, which is placed on one surface of the substrate,
the rich many point light sources includes, at least, the first point light source, which is located next to the connector, and the second point light source, which is located at a position remote from the connector compared to the first point light source, and
luminous flux emitted from the first point source of light above the light flux emitted from the second point source of light.

2. The backlight device according to claim 1, in which the current flowing through the first point light source, the higher the current flowing through the second point light source.

3. The backlight device according to claim 1 or 2, in which the light output of the first point source of light above the light output of the second point light source.

4. The backlight device according to claim 1 or 2, in which the density of point light sources located in the vicinity of the connector is higher than the density of point light sources placed in a region other than the vicinity of the connector.

5. The backlight device according to claim 4, in which the point light sources include a first point light source, which is located next to the connector, and the second point light source, which is located at a position remote from the connector compared to the first point light source, the set of substrates is provided, and the distance between the first point light sources is on adjacent substrates is less than the distance between the first point light source and the second point light source on one of the substrates.

6. The backlight device according to any one of claims 1, 2 and 5, in which the reflective element is provided in a predetermined region on one surface of the substrate.

7. The backlight device according to any one of claims 1 to 2 and 5, in which point light sources are placed in the longitudinal direction of the substrate.

8. The backlight device according to claim 7, in which point light sources are placed on one of the substrates in the longitudinal direction of the substrate with an identical step.

9. The backlight device according to claim 7, in which the connector is placed on the end of the substrate in the longitudinal direction, and the set of substrates is placed along the longitudinal direction.

10. The backlight device according to any one of claims 1, 2, 5, 8 and 9, in which the set of substrates are provided, and a connector electrically connects the adjacent substrate.

11. The backlight device according to any one of claims 1, 2, 5, 8 and 9, in which a point light source is a light emitting diode.

12. The backlight device according to any one of claims 1, 2, 5, 8 and 9, in which multiple light-diffusing lenses are provided so that they cover a lot of point light sources, respectively.

13. The display device containing the backlight device according to any one of claims 1 to 12 and a display panel that is illuminated by the device rear pods the weave.

14. The display device according to item 13, in which the display panel includes a liquid crystal display panel.

15. Television receiver containing the display device according to item 13 or 14, the casing that holds the display device, tuner and speaker.



 

Same patents:

FIELD: physics.

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FIELD: electricity.

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FIELD: electricity.

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16 cl

FIELD: electricity.

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19 cl, 12 dwg

FIELD: electricity.

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EFFECT: ensuring stable fixture for light sources without use of screws.

36 cl, 29 dwg

Flat panel display // 2390104

FIELD: information technology.

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8 dwg, 1 tbl

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FIELD: personal computer hardware, possible use as flat panel display for monitor and television set.

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EFFECT: production of display cells with less than 1ms response time, with 256 gradations of each main color, increased brightness of pixel images for each element of screen matrix and production of resolution on screen in HDTV format.

6 dwg

Flat panel display // 2316133

FIELD: flat panel display devices, possible use as flat panel monitor with production of stereo image conditions.

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1 tbl, 6 dwg

The invention relates to a device for displaying graphical information

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FIELD: physics, optics.

SUBSTANCE: backlight for a colour liquid crystal display includes white light LEDs formed using a blue LED with a layer of red and green phosphors over it. In order to achieve a uniform blue colour component across the surface of a liquid crystal display screen and achieve uniform light output from one liquid crystal display to another, the leakage of blue light of the phosphor layer is tailored to the dominant or peak wavelength of the blue LED chip. The backlight employs blue LED chips having different dominant or peak radiation wavelength.

EFFECT: different leakage amounts of light through the tailored phosphor layers offset the attenuation on wavelength of the liquid crystal layers.

15 cl, 13 dwg

FIELD: physics.

SUBSTANCE: liquid crystal display device (100) of the present invention includes a liquid crystal display panel (10) and a lateral illumination unit (20) which emits light from a position which is lateral with respect to the panel (10). The panel (10) includes a front substrate (1), a back substrate (2) and a light-diffusing liquid crystal layer (3). The unit (20) includes a light source (7), which is situated in a position which is lateral with respect to the panel (10), and a light-guide (6), having a light-output surface (6b) through which light emitted by the light source (7) as well as light incident on the light-guide (6) is emitted towards the end surface (1a) of the substrate (1). The surface (6b) is slanted relative a direction which is vertical with respect to the front surface (1b) of the substrate (1), such that it faces the back surface of the panel (10).

EFFECT: preventing generation of a bright line in the panel.

3 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: in carrier pin (11) used for support of optical elements (43-45) though which part of light passes from light-emitting diode (24) a part of peak (14) contacting with light-diffusing plate (43) is formed of light-reflective material while a part of rack (12) supporting peak (14) is formed of light-transmitting material.

EFFECT: eliminating mom-uniformity of lighting.

12 cl, 13 dwg

FIELD: physics.

SUBSTANCE: backlight unit (49) of a display device (69), having a liquid crystal display panel (59), equipped with a base (41), a diffusing plate (43) mounted on the base, and a light source which illuminates the diffusing plate with light. The light source has a plurality of light-emitting modules (MJ) which include a light-emitting diode (22) which serves as a light-emitting element, and a divergent lens (24) covering the light-emitting diode. The light-emitting modules are placed on a grid on the base supporting the diffusing plate. Carrier pins (26) for mounting the diffusing plate are located on points on the base. The carrier pins are placed on sections of lines linking neighbouring pairs of light-emitting modules.

EFFECT: eliminating non-uniformity of luminance.

10 cl, 14 dwg

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

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: electricity.

SUBSTANCE: in carrier pin (11) used for support of optical elements (43-45) though which part of light passes from light-emitting diode (24) a part of peak (14) contacting with light-diffusing plate (43) is formed of light-reflective material while a part of rack (12) supporting peak (14) is formed of light-transmitting material.

EFFECT: eliminating mom-uniformity of lighting.

12 cl, 13 dwg

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