JPH03215819A - Plzt display device - Google Patents

Abstract

PURPOSE:To couple mutually adjacent units without forming a gap and to prevent joints between the units from becoming dark by forming engaging grooves which are engaged with the side plate of a frame at both side parts on the reverse surface side of a light diffusing plate and fitting this light diffusing plate to the frame through the engaging grooves. CONSTITUTION:The engaging grooves 3a and 3a which engage the side plate tip parts 1b and 1b of the frame 1 are formed at both the end parts on the reverse surface side of the light diffusing plate 3. On the top surface side of this light diffusing plate 3, a PLZT display plate 4 is fitted. The side plate tip parts 1b and 1b of the frame 1 are engaged in the engagement grooves 3a and 3a of the light diffusing plate 3 to fit the light diffusing plate. Then transparent ceramic units like this are juxtaposed and their light diffusing plates 3 are joined mutually to prevent their joints from becoming dark.

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, television display, or text or image information display. Regarding the PLZT display device, in more detail,
The present invention relates to a means for attaching the light diffusing plate.

[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.

Figure 5 shows PLZT as one element that makes up the screen.
The configuration of the unit is shown. That is, this circle, Z
The T unit includes a substantially U-shaped frame 1 made of a metal plate such as stainless steel.

For example, a fluorescent tube 2 as a backlight is inserted into the frame 1, and the frame 1 also acts as a reflector. The thickness of this frame 1 is about 0.1 inch, and a pair of auxiliary frames la, la forming a circuit board storage section are provided on the back side of the frame 1. A light diffusing plate 3 made of, for example, a milky-white acrylic plate with a thickness of 2 mm is provided on the front end opening side of the frame 1, and a PLZT display plate 4 is further provided on the surface thereof. This PLZT display plate 4 is composed of, for example, a four-layer structure including a first polarizing plate 4a, PLZT pellets 4b, a color filter 4c, and a second polarizing plate 4d.

[Problem to be solved by the invention]

As shown in Fig. 6, the above PLZT unit is
Although a display screen of a predetermined size can be obtained by arranging a plurality of light diffusing plates 3, since both ends of the light diffusing plate 3 are supported by both side plates of the frame 1, there are the following drawbacks. That is, since a blank of about 0.2 mm is created by the end portions lb, lb of the adjacent frames 1, 1 at the joining portion of the adjacent frames 1, 1, the portion and its vicinity become dark.

Further, an adhesive is applied to the end of the light diffusing plate 3, but if the smoothness of the adhesive is poor, unevenness will occur on the frame 1, and gaps will occur when the plates are arranged side by side.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, a light diffusing plate is installed between both side plates of a substantially U-shaped frame that acts as a reflector for the backlight, and In a PLZT display device configured by arranging a plurality of PLZT units in which a PLZT display board is provided on the front side of a diffuser plate, -3- both sides of the back side of the light diffuser plate are engaged with the side plates of the frame. An engaging groove is formed to hold the light diffusing plate on the frame via this engaging groove.

[For production]

Adjacent display pixels are connected through a light diffusing plate without creating any gaps, so the joints between them do not become particularly dark. In addition, the light diffusing plate can be attached by simply engaging the side plate of the frame in the engagement groove, which improves assembly work efficiency.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4. In this embodiment, parts that are the same as those in the preceding example described above are given the same reference numerals.

According to this invention, the engagement grooves 3a, which engage with the side plate tips 1b, lb of the frame 1, are provided at both ends of the back side of the light diffusing plate 3;
3a is formed. According to this example, the light diffusing plate 3 has a length of 8
It consists of an acrylic board measuring 0m, width 40mm, and thickness 2mm.
The above engagement groove has a width of 0.1 mm and a depth of 0.05 mm on the back side.
It is formed with dimensions of mm. Na-4 Oh, on the front side of this light diffusing plate 3, there is a P similar to that of the preceding example.
The LZT display board 4 is attached.

According to this configuration, as shown in FIG. 1, the light diffusing plate 3 is attached to the frame 1 by engaging the side plate tips 1b, lb of the frame 1 into the engagement grooves 3a, 3a. Installed. Even if these PLZT units are arranged side by side, the light diffusing plates 3 are joined to each other, as shown in FIG. 4, and the joint portion does not become particularly dark.

〔Effect of the invention〕

As explained above, according to the present invention, engagement grooves that engage with the side plates of the frame are formed on both sides of the back side of the light diffusion plate, and the light diffusion plate is attached to the frame via the engagement grooves. By attaching the units, adjacent units are connected to each other by the light diffusing plate without creating any gaps, so the joints between the units do not become particularly dark. Furthermore, the light diffusing plate can be attached by simply engaging the side plates of the frame in the engagement grooves thereof, resulting in improved assembly work efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of one display pixel (PLZT unit) of a PLZT display device according to the present invention, and FIG. 2 is a rear view of a light diffusing plate used in the embodiment. , FIG. 3 is a cross-sectional view taken along line mm in FIG. 2, FIG. 4 is a front view showing a state in which the display pixels of FIG. Schematic plan view similar to fig.
FIG. 6 is a plan view similar to FIG. 4 in which the preceding example is arranged side by side. In the figure, 1 is a frame, 2 is a fluorescent tube, 3 is a light diffusion plate, 3a
is an engagement groove, and 4 is a PLZT display board.

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, an engagement groove that engages with the side plate of the frame is formed on both sides of the back side of the light diffusion plate, and the light diffusion plate is connected to the PLZ characterized by being held in a frame
T display device.