JPH03215818A - PLZT display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention utilizes the electro-optical effect of PLZT (transparent ceramic), and uses the PLZT unit as a large screen display, a large television display, or a text or image information display. The present invention relates to the PLZT display device used, and more specifically, to the light diffusing plate thereof.

[Conventional technology]

In recent years, transparent ceramic PL made by adding La to PZT has been developed.
ZT (PbO, Lad, ZrO., Tie) is about to be used in optical shutters and display devices.

Referring to FIGS. 3 and 4, an example of which is shown, the PLZT display device 1 consists of a plurality of PLZT units 2 . . . arranged in parallel. Here, each PLZ
The T unit 2 has a nearly U-shaped frame 3 made of a metal plate made of stainless steel or the like with a thickness of about 0.1 mm, and a light-diffusing frame 3 made of an acrylic plate with a thickness of 2+ nm and exhibiting a milky white color is provided at the tip end of the frame 3. A plate 4 is provided, and a PLZT display plate 5 is attached to the front side of the light diffusing plate 4.

For example, a fluorescent tube 6 as a backlight is inserted into each frame 3, and the frame 3 also acts as a reflecting plate. Although not shown in detail, each PLZT display plate 5 has, for example, a first polarizing plate,
It consists of a 4R structure of PLZT pellets, a color filter, and a second polarizing plate.

[Problem to be solved by the invention]

A display screen of a predetermined size can be obtained by arranging a plurality of PLZT units 2 as described above, but when looking at each PLZT unit 2, since the fluorescent tube 6 is placed in the center, the same area However, it has the disadvantage that it gets darker towards the edges.

[Means to solve the problem]

This invention was made to solve the above problems,
Its structural feature is that a light diffusing plate is installed between both sides of a nearly U-shaped frame that acts as a reflector for the backlight, and a PLZT display board is provided on the front side of the light diffusing plate. In a PLZT display device configured with a plurality of units arranged in parallel, a plurality of grooves are formed on the back side of the light diffusing plate from the center to the end in parallel with the backlight, and the width increases as the width approaches the end. This is due to the fact that it is formed so that it gradually increases in size and depth.

[For production]

By forming the grooves as described above on the back side of the light diffusing plate, the thickness of the end portions becomes thinner overall, so that the brightness of the light diffusing plate is made uniform.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2. Note that although only the light diffusing plate 4 is shown in these figures, it should be understood that the frame 3, PLZT display plate 5, etc. are the same as in the preceding example described above.

According to the present invention, a plurality of grooves 7a to 7e, in this example, two grooves each, ten in total, are provided on the back side of the light diffusing plate 4. Each of these grooves 78 to 7e extends parallel to the fluorescent tube 6, and the two grooves 7ay7a at the center are the narrowest and shallowest, while the grooves extend toward the ends. Its width and depth are gradually increasing.

That is, in this example, the grooves 7e, 7e closest to the ends are made larger in both width and depth.

In this embodiment, the light diffusing plate 4 has a length of 80lIII1.
, made of an acrylic board with a width of 40 and a thickness of 2, the largest.
3- The depth of the large grooves 7e and 7a is about inn, which is about half the thickness of the light diffusing plate 4. Further, the upper limit of the width is 600 μm of the black matrix of the color filter. Here, an experiment was conducted in which the width of each groove 78 to 7e was set to 200 μm and the depth was gradually increased toward the end. As a result, the brightness was more uniform than that of a groove without grooves, and the brightness was 200 μm. % improvement.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of grooves are formed on the back side of the light diffusing plate from the center to the end in parallel with the backlight, and the width and depth gradually increase as the distance approaches the end. By forming the light diffusing plate to be large, the brightness of the light diffusing plate is made uniform, and a display screen with uniform brightness can be obtained as a whole.

[Brief explanation of drawings]

FIG. 1 shows P elements constituting a PLZT display device according to the present invention.
FIG. 2 is a cross-sectional view of the light diffusing plate used in the LZT unit, FIG. 3 is a front view of a PLZT display device showing a precedent example of this invention-4-, and FIG. It is a sectional view of the same prior example. In the figure, 1 is a PLZT display device, 2 is a PLZTI display device, 3 is a frame, 4 is a light diffusion plate, 5 is a PLZT display board,
6 is a fluorescent tube, and 7 is a groove.

Claims (1)

[Claims] (1) A light diffusing plate is attached between both sides of a nearly U-shaped frame that acts as a reflector for the backlight, and a PLZT display board is provided on the front side of the light diffusing plate. Multiple PLZT units are installed in parallel. In the PLZT display device, a plurality of grooves are formed on the back side of the light diffusing plate from the center to the end in parallel with the backlight, the width and depth increasing as the distance approaches the end. A PLZT display device characterized in that it is formed to gradually increase in size.