JPH0574831B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front panel of a liquid crystal display element that can be used in a large screen display device comprising a plurality of transmissive liquid crystal display elements.

(Prior art) In recent years, in addition to large-screen display devices that use fluorescent lamps of three primary colors or cathode tray tubes (CRTs) of three primary colors, liquid crystals have been used as light switches and color filters of three primary colors have been developed. A method using is being considered.

FIG. 2 shows a conventional lighting device for a liquid crystal display element, in which the light emitted from a white fluorescent lamp 1 is
When the light enters the liquid crystal section (LCD) 2, the amount of light passing through the LCD 2 is adjusted by an external signal, and the light enters the layer of the color filter 3.

The color filter 3 consists of three color filters B, G, and R (B, G, and R are color filters for changing white light to blue, green, and red, respectively) corresponding to one of the pixels. The light that has passed through this is again subjected to additive mixing to form color pixels, and an image is displayed at the position of the image display section 5 on the front panel 4. The size of a single sheet of liquid crystal display element that can currently be constructed is from 6 inches to 12 inches (1 inch = 2.54 cm) square, and in order to construct a larger screen, it is necessary to line up multiple panels. be.

(Problems to be Solved by the Invention) Generally, the ends of a liquid crystal display element have wiring portions as shown in FIG. If there is a black line at the seam as shown, or as shown in Figure 3-8,
This has the problem that it looks like a black grid pattern.

(Means for Solving the Problems) The front panel of the liquid crystal display element of the present invention has a structure in which a plurality of transmissive liquid crystal display elements are arranged side by side to form a large screen liquid crystal display element. A transparent front panel is provided in between, and an umbrella-shaped protrusion is provided on the liquid crystal display element side of the front panel at a position along the seam.

(Function) Light incident near the joint of the front panel of the liquid crystal display element of the present invention passes through the liquid crystal section and the color filter section, and then is bent toward the joint by the umbrella-shaped protrusion, resulting in observation. Since the user will not be able to recognize the seams, seamless display will be possible.

(Example) An example of the present invention will be described based on FIG. 1 and FIGS. 4 to 6.

FIG. 1 is a sectional view of the front panel of the liquid crystal display element of the present invention.

In this figure, the same parts as in FIG. 2 are given the same numbers. Furthermore, among the basic elements shown in FIG. 2, the structure of the front panel is different, and an umbrella-shaped projection is placed at the joint.

In FIG. 1, the front of the front panel 4 is exposed to light.
A diffusion layer 9 that appears to be radiating from there is provided over the entire surface, and on the opposite side of the diffusion layer 9, an umbrella-shaped protrusion 1 is provided at a position corresponding to the wiring section 6 of the liquid crystal.
0 is set. The light beams 11 and 11' emitted from the fluorescent lamp 1 enter the pixel 12 in the exterior part closest to the joint of the liquid crystal display element, and pass through the color filter 3.
When it passes through and enters the front panel 4, the umbrella-shaped projection 1
0 bends the ray bundle 11 toward the joint side,
Light now goes directly below the seams where there is no light,
The light reaches the position 13 of the diffusion layer 9 on the front panel 4 and is diffused in all directions. On the other hand, the light beam 11' incident on the adjacent liquid crystal display element passes through the pixel 12 and reaches a position 14 on the front panel 4.

If the slope of the umbrella-like protrusion 10 is determined so that the side ends of the pixels 12 and 12' on the wiring section 6 side slightly overlap each other at position 15 on the front panel 4, the viewer will not be able to recognize the joint.

Since the umbrella-shaped projections are arranged along the seams, when arranged vertically and horizontally, they look like the one shown in FIG. 4.

Furthermore, an example of the shape of the inclined surface of the umbrella-like projection is shown in the fifth example.
As shown in the figure. If the slope is set at a constant angle, a discontinuity in the image will be perceived where the slope transitions from a flat surface, so ideally the slope is high near the apex and becomes gentler as it approaches the flat surface.

In FIG. 5, the slope gradually decreases, but in the second example shown in FIG. 6, the slope changes slowly and continuously.

Ideally, the shape shown in FIG. 6 is desirable, but the shape shown in FIG. 5 is superior in terms of ease of shape creation.

(Effects of the Invention) According to the present invention, a transparent front panel is provided on the viewer side at the joint of the liquid phase display element,
By providing an umbrella-shaped protrusion on the liquid crystal display element side of this front panel at a position corresponding to the seam of the liquid crystal display element, light incident on the display part near the outer edge of the liquid crystal display element is bent toward the seam side. This has the effect of making the joints of liquid crystal display elements less noticeable by reaching the dark area directly below the joints.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the front panel of a liquid crystal display element according to an embodiment of the present invention, FIG. 2 is a sectional view of the front panel of a conventional liquid crystal display element, and FIG. 3 is a front view of a display example with a conventional configuration. , FIG. 4 is a layout diagram of the umbrella-shaped projections of the front panel of the present invention, and FIGS. 5 and 6 are cross-sectional views showing the shape of the slope of the umbrella-shaped projections. 1...Fluorescent lamp, 2...Liquid crystal section, 3...Color filter, 4...Front panel, 5...Image display section, 6...
...Wiring section, 7...Joint, 8...Lattice pattern, 9
... Diffusion layer, 10 ... Umbrella-shaped projection, 11, 11'...
...Light ray flux, 12, 12'...Pixel, 13...Diffusion layer position, 14...Front panel position, 15...
Location of the wiring section on the front panel.

Claims (1)

[Claims] 1 When a plurality of transmissive liquid crystal display elements are arranged side by side to form a large-screen liquid crystal display element, light from the pixels at the outermost edge of the liquid crystal display element is projected adjacent to each other at a position on the front panel that corresponds to the joint between them. A front panel of a liquid crystal display element, characterized in that a projection having an umbrella-shaped cross section with the front panel as the bottom and the liquid crystal display element body side as the apex is arranged along the joint.