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IPC classes for russian patent Display (RU 2158434):
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(57) Abstract:

The invention relates to optical systems using holograms as optical elements. The display contains a lamellar liquid crystal panel having multiple liquid crystal cells arranged between the front and back surfaces of the panel, plate optical waveguide connected to the liquid crystal panel from its back surface in a single unit, a hologram made zuzelo with the optical waveguide, and a light source optically connected with the optical waveguide. Between the rear surface of the liquid crystal panel and an optical waveguide made the gap is filled with a transparent material that has a refractive index smaller than the refractive index of the optical waveguide, and is adhesive material connecting the liquid crystal panel and the optical waveguide into a single node. The technical result is to improve the quality of the color image, as well as provide a monolithic display, with high resistance to mechanical loads and protected from internal contamination. 10 C.p. f-crystals, 5 Il.

The invention the liquid crystal displays that use holograms to form a colored image.

PRIOR ART
Known for displays containing a liquid-crystal panel having a front surface, back surface, and many liquid crystal cells arranged between the front and back surfaces of the panel, means for lighting the liquid crystal cell side of a back surface of a liquid crystal panel including an optical waveguide and a light source optically connected with the optical waveguide, and a hologram located on the rear surface of the panel between it and the optical waveguide and designed to separate aimed at the hologram of white light into red, green and blue components, aimed at the liquid crystal cell (US-A N 5506701, 1996, CL IPC(6) G 02 B 5/32, CL NCI 359/15; 359/22; 359/53, the priority of JP-A NN 5-012170; 5-014572; 5-097517, 1993).

In this display (Fig. 14-16 and their descriptions optical waveguide is located at a distance from the hologram, and means for lighting the liquid crystal cell provided with a mask located between the optical waveguide and the hologram and has many holes located is verste mask and intended to convert divergent beams of light, coming out of the holes of the mask, in parallel rays directed at the hologram.

In such a display of his work through the hologram on the liquid crystal cell panel except for the color components passes partially nederevyanny light, deteriorating the image quality. In addition, for the proper functioning of such a display, it is necessary very accurately mutually align the holes of the mask, the microlenses corresponding to the areas of the hologram and the liquid crystal cell panel that may cause some problems in the manufacture of the display.

DISCLOSURE OF THE INVENTION
This invention was based on the challenge to create a display with high qualities of the resulting color image with a relatively simple design and manufacturing technology of the display.

This problem is solved by the fact that in the display containing a liquid crystal panel having a front surface, back surface, essentially equidistant specified front surface and located at a distance from it, and many liquid crystal cells arranged between the said front and back surfaces, a hologram next to alaskastock cells from the specified back surface of the specified liquid crystal panel, includes an optical waveguide having a first side surface, essentially equidistant specified back surface of the specified liquid crystal panel, and a second lateral surface, essentially equidistant specified first side surface and located at a distance from it, and the light source, optically associated with the specified optical waveguide according to the invention, the hologram is made zuzelo with the specified optical waveguide, and the said liquid crystal panel and the optical waveguide are connected in a single node.

This embodiment of the display improves the quality of the resulting color image - brightness, clarity and color reproduction due to the reduction of losses by radiation between the light source and the liquid crystal cells through the reduction of chromatic distortion when splitting white light into its color components and due to the possibility of increasing the accuracy of the orientation of the hologram relative to other elements of the display, and also simplifies the display due to the exclusion of a number of elements.

The hologram can be performed on the first mentioned side surface of the optical Volno the optical waveguide, or inside the optical waveguide equidistant its lateral surfaces.

Between the rear surface of the liquid crystal panel and the first side surface may be made of the gap filled with an optically transparent material having a refractive index smaller than the refractive index of the optical waveguide.

It is advisable that the value of the specified gap was less than the distance between the side surfaces of the optical waveguide.

It is advisable that an optically transparent material was adhesive material connecting the liquid crystal panel and the optical waveguide into a single node.

This embodiment provides receiving a monolithic display, with high resistance to mechanical loads and protected from internal contamination.

The light source may be polychromatic and can be equipped with three emitters respectively red, green and blue colors.

It is advisable to each of these emitters to perform in the form of LEDs.

This embodiment improves the accuracy of the color adjust and correct for chromatic distortion phur DRAWINGS
Fig. 1 is a schematic representation of the display in accordance with the invention in cross-section (ratio of the dimensions shown conventionally without observance of proportions).

Fig. 2 shows the position a in Fig 1 in a larger scale (the ratio of the sizes shown suspended without observance of proportions).

Fig. 3 shows another variant designated a in Fig. 1 in an enlarged scale (the ratio of the sizes shown suspended without observance of proportions).

Fig. 4 shows another variant designated a in Fig. 1 in an enlarged scale (the ratio of the sizes shown suspended without observance of proportions).

Fig. 5 shows another variant designated a in Fig. 1 in an enlarged scale (the ratio of the sizes shown suspended without observance of proportions).

DETAILED DESCRIPTION OF THE BEST EMBODIMENTS OF THE INVENTION
As shown in Fig. 1, the display includes the liquid crystal panel 1, the optical waveguide 2, zuzelo through the hologram 3a (Fig. 1 - 2) (3b, 3c - 3d, 3f, Fig. 3, 4, 5), and the light source 4 (Fig. 1), optically associated with the optical waveguide 2. The liquid crystal panel 1 (Fig. 1 - 5) is a plate having a front surface 5, the back surface 6, there is a mini-cells 7', 7", 7"', located between the outer surface 5 and the rear surface 6 (Fig. 1 to 5 are shown and identified one group of three cells, the remaining cells are not shown and are not marked). The front surface 5 and the back surface 6 of the liquid crystal panel 1 can be flat, as shown in Fig. 1 to 5, or may be non-planar (not shown in the drawings). The liquid crystal cell 7', 7", 7"' are arranged in parallel rows in the first and second mutually intersecting, mostly at right angles, directions (not shown in the drawings) in such a way that they form a matrix between the outer surface 5 and the rear surface 6 of the liquid crystal panel 1. In the liquid crystal panel 1 is first in a series of parallel electrodes 8 (Fig. 1 to 5 are shown and denoted by the electrode). The electrodes 8 are combined with parallel rows of liquid crystal cells 7', 7", 7"', passing in the first direction. In the liquid crystal panel 1 has a second series of parallel electrodes 9, which are located predominantly at right angles to the electrodes 8 (Fig. 1 to 5 are shown and marked one electrode 9, conditionally passing in the same direction as that of the electrode 8, while in reality the electrodes 8, 9 is made the cell 7', 7", 7"', passing in the second direction and intersecting parallel rows, passing in the first direction, so that the electrodes 8, 9 form a grid, aligned with the rows of liquid crystal cells 7', 7", 7"'. The electrodes 8, 9 are electrically connected with the control unit 10 (Fig. 1). The optical waveguide 2 and the light source 4 constitute the means of day-lighting of liquid crystal cells 7', 7", 7"' from the rear surface 6 of the liquid crystal panel 1.

The optical waveguide 2 (Fig. 1) is a plate of optically transparent material having a polished first side surface 11, equidistant back surface 6 of the liquid crystal panel 1, the polished second side surface 12, equidistant the first side surface 11 and located at a distance from it (Fig. 2 - 5), and opposite end faces 13, 14 (Fig. 1). Between the rear surface 6 of the liquid crystal panel 1 and the first side surface 11 of the optical waveguide 2 (Fig. 2 - 5) made the gap 15, the value of b which is smaller than the distance a. The gap 15 is filled with an optically transparent material (not labeled) having a refractive index less than the refractive index of the optical material Volno kristallicheskuyu panel 1 and the optical waveguide 2 in a single unit, thanks to improved durability of the display to mechanical loads, and it is protected from contamination.

The light source 4 (Fig. 1) can be equipped with incandescent lamp (not shown in the drawings), fluorescent lamp (not shown in the drawings) or, as shown in Fig. 1, three svetoizluchateli LEDs 16, 17, 18, respectively, red, green, and blue colors. Such a light source is polychromatic. Between the light source 4 and the butt 13 of the optical waveguide 2 has an adapter 19 of optically transparent material.

Hologram 3a (Fig. 1 - 2) (3b, 3c - 3d, 3f, Fig. 3, 4, 5) is located behind the rear surface 6 of the liquid crystal panel 1. In one embodiment, the display (Fig. 2) hologram 3a is performed on part of the first side surface 11 of the optical waveguide 2. In another embodiment, the display (Fig. 3) the hologram 3b is performed on part of the second side surface 12 of the optical waveguide 2. In yet another embodiment, the display (Fig. 4) the hologram 3c - 3d made as part of the first side surface 11, and on part of the second side surface 12 of the optical waveguide 2. In yet another embodiment, the display (Fig. 5) the hologram 3f performed inside the optical oleada hologram 3a, 3b, 3c, 3d, 3f has a heterogeneous area diffraction efficiency, increasing from end 13 to the end face 14 of the optical waveguide 2.

The light source 4 (Fig. 1) has a device separate control voltage (not shown) supplied to the LEDs 16, 17, 18.

Describes the display operates as follows.

When applying voltage to the LEDs 16, 17, 18 the latter emit light respectively red, green and blue colors. White light obtained by mixing red, green, and blue light through the adapter 19 is fed into the optical waveguide 2 through the end 13. Thanks to the separate regulation of the voltage supplied to the LEDs 16, 17, 18, i.e., separate regulation of the radiation intensity of each led, it is possible to improve the accuracy of color adjust and correct for chromatic distortion of the image generated by the display.

Due to the effect of total internal reflection from the side surfaces 11, 12 of the optical waveguide 2 white light, as shown in Fig. 2 - 5 in phantom lines with arrows (not labeled) extends in the optical waveguide 2 and dirigeret on the hologram 3a, 3b, 3c - 3d or 3f. Dragirovaniya sicheres his side surface 11 and the gap 15 in the direction of the cells 7', 7". 7"' liquid crystal panel 1 from the back surface 6. Light, not proimaginative on the hologram 3a, 3b, 3c - 3d or 3f, remains inside the waveguide 2 and repeatedly reflected from the side surfaces 11, 12, again gets on other parts of the holograms 3a, 3b, 3c - 3d or 3f, again dirigeret and out of the waveguide 2 in the direction of the liquid crystal panel 1.

Thus, due to the fact that the hologram 3a, 3b, 3c - 3d, 3f performed zuzelo with the optical waveguide 2, reduced losses by radiation and is, essentially, full use of the power of light received in the optical waveguide 2 (except for losses in the material of the optical waveguide (2), for lighting the liquid crystal panel 1.

Hologram 3a, 3b, 3c - 3d, 3f recorded in such a way that generates beams of red, green and blue directed to the appropriate cell 7', 7", 7"' liquid crystal panel 1, so that in each cell 7', 7", 7"' the light comes from one of these chromatic colors without distortion.

Due to the fact that the liquid crystal panel 1 and the optical waveguide 2 is connected between a common node, a hologram 3a, 3b, 3c - 3d, 3f performed touched with the optical waveguide 2, p the liquid crystal panel 1.

Due to the nonuniform diffraction efficiency of each hologram 3a, 3b, 3c, 3d, 3f, increasing from end 13 to the end face 14 of the optical waveguide 2, provided uniform illumination of all cells 7', 7", 7"' liquid crystal panel 1.

The control unit 10 applies a voltage to these electrodes 8, 9 and, thereby, changes the transparency of the cells 7', 7", 7"' liquid crystal panel 1. With each cell 7', 7", 7"' in a transparent state passes a beam of one of the specified colors, and on the front surface 5 of the liquid crystal panel 1 is formed a color image having high quality - brightness, clarity and color reproduction, including white.

INDUSTRIAL APPLICABILITY
Describes the display can be used in computer monitors, television receivers, in a variety of instruments, demo screens and scoreboards.

1. A display containing a liquid crystal panel having a front surface, back surface, essentially equidistant specified front surface and located at a distance from it, and many liquid crystal cells arranged between the said front and back surfaces, a hologram, rasia these liquid crystal cells from the specified back surface of the specified liquid crystal panel, includes an optical waveguide having a first side surface, essentially equidistant specified back surface of the specified liquid crystal panel, and a second lateral surface, essentially equidistant specified first side surface and located at a distance from it, and the light source, optically associated with the specified optical waveguide, characterized in that the hologram is made zuzelo with the specified optical waveguide and the specified liquid crystal panel and the optical waveguide are connected in a single node.

2. Display under item 1, in which the specified hologram is made, at least part of the first mentioned side surface of the specified optical waveguide.

3. Display under item 1, in which the specified hologram is made, at least part of the second mentioned side surface of the specified optical waveguide.

4. Display under item 1, in which the specified hologram is made, at least part of the first mentioned side surface of the specified optical waveguide and at least part of the second mentioned side surface of the specified optical waveguide.

6. The display according to any one of paragraphs.1 to 5, in which between the said rear surface of the specified liquid crystal panel and the first side surface of the specified optical waveguide is a gap filled with an optically transparent material having a refractive index smaller than the refractive index of the specified optical waveguide.

7. The display on p. 6, in which the value of the specified clearance is less than the distance between the said first lateral surface of the specified optical waveguide and the second lateral surface of the specified optical waveguide.

8. The display on p. 6, wherein said optically transparent material is an adhesive material connecting the specified liquid crystal panel and the optical waveguide into a single node.

9. The display according to any one of paragraphs.1 to 8, wherein said light source is polychromatic.

10. The display on p. 9, wherein said polychromatic light source is provided on men which each of these emitters is made in the form of LEDs.

 

 

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