JPS6350688Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device including a display element having a plurality of pixels, such as a liquid crystal display element.

FIG. 1 shows a conventional liquid crystal display device, which includes a light source 1 and a liquid crystal display element 2 that receives light from the light source 1 and displays a color image. It is composed of a liquid crystal cell 3, a color filter 4, a polarizing plate 5 disposed between them, another polarizing plate 5' disposed on the surface of the liquid crystal cell 3 on the light source 1 side, and a diffusion plate 6. .

The liquid crystal cell 3 is formed of transparent plates 3A, 3A, a liquid crystal (not shown) sealed between them, and a lead wire 7 connected to a transparent electrode for applying voltage to the liquid crystal. ing.

The color filter 4 has color pixels 8 arranged at intervals in a matrix.

Next, the operation of the liquid crystal display device will be explained. That is, when the lead wire 7 is energized and a predetermined voltage is applied to the liquid crystal via the transparent electrode, the liquid crystal exhibits translucency, and the light that has passed from the light source 1 through the diffuser plate 6 and the polarizing plate 5' becomes polarized. Color filter 4 via plate 5
It passes through the color pixels 8 of . Therefore, it is possible to obtain a desired color image.

In a liquid crystal display device having such a configuration, each pixel 8
In between, a space is required for wiring the lead wires 7 in correspondence with each pixel, and for this reason, the color filter 4 is provided with a light-opaque section 9; however, when this light-opaque section is provided, Not only cannot a continuous color image be obtained, but also the light from the light source cannot be fully utilized, which is uneconomical, and when the display elements are connected to each other, the connecting portions are exposed, which is aesthetically undesirable. Another drawback is that it is extremely troublesome to commercialize a display device consisting of a large number of display elements.

This idea was made in view of the above points,
To provide a display device that can efficiently utilize light, display continuous color images, and is easy to commercialize.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a liquid crystal display device according to the present invention, and this liquid crystal display device includes a light source 1 and a liquid crystal display element 2 that receives light from the light source 1 and displays a color image. Since the liquid crystal display element 2 has the same structure as the element shown in FIG. 1, the same parts are given the same reference numerals and the explanation thereof will be omitted.

Now, as shown in FIG. 2, the liquid crystal display device according to the present invention includes a light collecting grating 10 disposed between the light source 1 and the display element 2, and a light condensing grating 10 disposed on the 8th pixel side of the display element 2. A scattering grid 11 and a diffusion screen 12 are provided.

The condensing grating 10 and the scattering grating 11 have reflective surfaces, for example, rod-shaped bodies 13 having a triangular cross-section and mirror-finished surfaces, and the bottom surface 13A, which is one side of each rod-shaped body 13, is included in the same plane. It is formed by combining vertically and horizontally. Therefore, each grid 10,1
In the rod-shaped body 13 of No. 1, the apex corner portion 13B, which is the corner portion opposite to the bottom surface 13A, faces in the same direction. The spacing between the rod-like bodies 13 of these gratings 10 and 11 corresponds to the spacing between the light-opaque parts 9 of the color filter 4, and the length of the bottom surface 13A in the width direction corresponds to that of the non-transparent parts 9. .

As shown in FIG. 3, the scattering grating 11 is
Each rod-shaped body 1 is attached to the light-opaque part 9 of the color filter 4.
The bottom surfaces 13A of each rod-shaped body 13 are fixed by appropriate means in a state where they are in surface contact, and the bottom surfaces 13A of each rod-shaped body 13 are in surface contact with the light collecting grating 10 at a position opposite to the scattering grating 11 of the polarizing plate 5'. It is fixed by appropriate means in this state. The diffusion screen 12 is fixed in line contact with the apex portion 13B of each rod-shaped body 13 of the scattering grating 11.

Next, the operation of the display device will be explained. That is,
When light is sent from the light source 1 to the element 2 with a voltage applied to the liquid crystal of the liquid crystal display element 2, each rod-shaped body 13 of the light collecting grating 10 is mirror-finished and has an apex portion 13B. is directed toward the light source 1, the light from the light source 1 is focused within the pixel corresponding area of the grating 10 as shown in FIG.
The light passes through each color pixel 8 through the polarizing plate 5. When the light from the light source passes through each pixel 8 of the color filter 4 in this way, each pixel 8 is surrounded by each bar-shaped body 13 of the scattering grid 11, and each bar-shaped body 1
3 is mirror-finished and the apex portion 13B faces in the light transmission direction, so the colored light exiting each pixel 8 is reflected and scattered by the rod-shaped body 13 and reaches the diffusion screen 12. Since this diffusion screen 12 is only in line contact with the apex portion 13B, the colored scattered light that is only divided into lines is projected onto the diffusion screen 12 as a continuous color image.

In the above embodiment, the liquid crystal display element 2 is sandwiched between both gratings 10 and 11 on both sides, and the connecting portion between the elements 2 is located on the bottom surface 13A of each rod-shaped body 13, so that the elements 2 are not connected to each other. In addition to being easy to connect, the connecting portions are not exposed to the outside, and the element 2 can be reinforced.

Incidentally, in the above embodiment, the rod-shaped bodies 1 of the grids 10 and 11
3 was formed into a triangular cross-sectional shape, but the apex portion 13
The inclined surface from B to the bottom surface 13A is a convex R surface and a concave R surface.
It may be formed on a surface.

Further, the rod-shaped body 13 only needs to have a reflective surface, and therefore, for example, in addition to a mirror finish, it may have a satin finish or a white finish that has a diffused reflection function.

Furthermore, the display element is not limited to the above-mentioned liquid crystal display element, and has a pixel interval. For example, ECD,
There are LED arrays, color lamp arrays, etc.

The diffusion screen 12 may be formed into a screen shape using a material with a large diffusion effect, such as a milky white diffusion plate, a satin screen, a Fresnel lens-shaped scattering plate compatible with lattice, and the like.

As explained above, according to the present invention, a display element is sandwiched between a condensing grating and a scattering grating, and these gratings are formed from a rod-shaped body having a reflective surface finish and a substantially triangular cross section. Since the diffusion screen is in line contact with the top corners of the grid, the elements can be easily and firmly connected to each other without exposing the connecting parts, and it also solves technically difficult problems such as reducing the wiring spacing of the lead wires. It is possible to obtain continuous images with excellent colors by concentrating the light from the light source without wasting any problems, and therefore, it is possible to easily and inexpensively provide a large display device with a large screen and a short viewing distance. . Furthermore, since the diffusion screen is used, it is possible to prevent the pixels of the device from becoming dust-proof, drip-proof, and optically deteriorated by external light.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a conventional liquid crystal display device, FIG. 2 is a partially exploded perspective view of a liquid crystal display device according to the present invention, and FIG. 3 is a partial sectional view of a liquid crystal display device according to the present invention. . DESCRIPTION OF SYMBOLS 1...Light source, 2...Liquid crystal display element, 4...Color filter, 7...Lead wire, 8...Color pixel, 9...Light non-transmissive part, 10...Light condensing grating, 1
1... Scattering grid, 12... Diffusion screen, 1
3...rod-shaped body, 13A...bottom surface, 13B...vertical corner part. In addition, in the figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims for Utility Model Registration] (1) A display element in which a plurality of pixels are arranged at intervals, a light collecting grid is arranged on the light source side, and a scattering grid and a diffusion screen are arranged on the pixel side. , these gratings are formed by combining a plurality of rod-like bodies each having a substantially triangular cross-section with a reflective surface finish in a vertical and horizontal manner with their respective bases lying on the same plane; The bottom surface and the opposing apex portion thereof are in surface and line contact with the light non-transmissive portion and the diffusion screen of the display element, respectively, and the light collecting grating is such that the bottom surface of each of the rod-shaped bodies is in contact with the light source side of the display element. A display device characterized by being in surface contact with the scattering grid. (2) The display device according to claim 1, wherein the display element is a liquid crystal display element. (3) The display device according to claim 1 or 2, wherein the light-opaque portion is between pixels and around the device.