JPH0570829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display panel device, and more particularly, to an image display panel device in which a plurality of image display panels are two-dimensionally arranged for large-screen color image display. The present invention relates to a display panel device.

Conventional Structure and Problems There is a well-known method of two-dimensionally arranging a plurality of image display panels, for example, liquid crystal panels, in order to realize a large-screen image display panel.
However, as shown in FIG. 1, since the liquid crystal panel 1 has a spacer around the periphery for sealing liquid crystal, it has an invalid screen area 2 around the periphery. Therefore, when a plurality of liquid crystal panels 1 are arranged two-dimensionally as shown in FIG. 2, a grid-like invalid screen area 3 is created, and the viewer feels as if he/she is viewing the image through the grid-like pattern 3, which gives a strange feeling. It was hot.

Purpose of the Invention The present invention provides an image display panel device for eliminating the above-mentioned grid pattern and projecting a large-screen image that does not give a strange feeling when a plurality of image display panels are arranged two-dimensionally. This is what we provide.

Structure of the Invention The image display panel device of the present invention has light guide means arranged in front of the image display panel for each picture element, the distance between which increases as the distance from the image display panel increases, and the distance between the light guide means increases as the distance from the image display panel increases. The device is configured such that the light beam bending means and the wavelength selection means are arranged at the ends or in the middle, thereby preventing a grid-like invalid screen area from appearing when a plurality of image display panels are arranged two-dimensionally. In addition to
This realizes a color image and also prevents uneven brightness across the entire screen.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the image display panel device of the present invention will be described with reference to the drawings. FIG. 3 shows a cross section of an embodiment of a flat image display panel device according to the present invention. A light guide means 4 is disposed in front of the liquid crystal panel 1, and a color panel 5 and a Fresnel lens 6 are superimposed thereon as wavelength selection means and light beam bending means, respectively. Light guide means 4, color panel 5
and the dimensions of the Fresnel lens 6 are the same. The liquid crystal panel 1 has a structure in which two transparent substrates 7 are stacked with a spacer 8 in between, and a liquid crystal 9 is sealed inside. On the surface of the transparent substrate 7 on the liquid crystal 9 side, a large number of transparent electrodes 10 and 11 are arranged in parallel with a required interval. Transparent electrode 10 and transparent electrode 1
1 are arranged in directions perpendicular to each other, and the overlapping portions of both transparent electrodes 10 and 11 form one pixel 12, respectively. Polarizing plates 13 and 14 are arranged on the outer surface of the transparent substrate 7, respectively. Furthermore, a planar light source 15 is provided behind the liquid crystal panel 1.
are arranged, and the transmittance of each pixel 12 is changed by controlling the voltage applied to both transparent electrodes 10 and 11. As shown in FIG. 4, the color panel 5 has red R, green G, and blue B color filters printed on each pixel 12 on the panel, and changes in transmittance of each pixel 12 of the liquid crystal panel 1 and By combining them, you can display a full-color image.

As shown in FIG. 5, the light guide means 4 is constructed by combining thin metal light guide plates 16 in a lattice shape, and the intervals between the thin metal light guide plates 16 widen as they move away from the liquid crystal panel 1. The end of the light guide means 4 on the liquid crystal panel 1 side is arranged so that its opening corresponds to each pixel 12 of the liquid crystal panel 1, and the opening at the other end of the light guide means 4 corresponds to each pixel 12 of the color panel 5. It is arranged so as to correspond to the pixel 12. The size of the light guide means 4 on the color panel 5 side is the same as or slightly larger than the overall external dimension of the liquid crystal panel 1. Therefore, the light guide means 4 works to enlarge each pixel of the liquid crystal panel 1 little by little, so that the invalid screen area caused by the spacer 8 around the liquid crystal panel 1 can be eliminated. By depositing a thin aluminum film on the surface of the light guide plate 16, its reflectance can be increased and the amount of light passing through the light guide means 4 can be prevented from attenuating.

The Fresnel lens 6 shown in FIG.
It has the effect of bending the light into a light ray 19 that is parallel or nearly parallel to the normal line 18 of the liquid crystal panel 1. The direction of the light ray 17 along the approximate central axis of each pixel 12 is
This almost coincides with the direction that gives the maximum brightness.
Therefore, if the Fresnel lens 6 is not attached, the light rays 17 will travel straight, so when the image is observed from the direction of the normal line 18 of the liquid crystal panel 1,
The brightness clearly decreases at the periphery of the image, resulting in a dark image at the periphery. However, if the Fresnel lens 6 is attached here, the light ray 17 that provides the maximum brightness is almost uniformly parallel to the normal line of the liquid crystal panel 1, so that the brightness distribution over the entire screen can be made almost uniform.

As shown in FIG. 6, a large number of liquid crystal panel devices shown in FIG.
By dimensionally arranging them, a large-screen color liquid crystal panel device can be realized. Each liquid crystal panel device is fixed to a grid frame 20. As a result, each liquid crystal panel device is arranged without any gaps to the viewer, and the viewer can see it as if it were one liquid crystal panel, which eliminates any sense of strangeness.

Other embodiments of the present invention will be described below.
In FIG. 7, a color filter 21 is formed directly on the flat side of the Fresnel lens 6. This saves the effort of bonding the color panel 5 and Fresnel lens 6 together. color filter 2
1 can be made by directly printing a dye onto the flat side of the Fresnel lens 6. It is also possible to form an interference filter on a plane by vapor deposition and use it as a wavelength selection means.

Lens surface 2 of Fresnel lens 6 shown in FIG.
The direction of 2 is not limited, and the effect is exactly the same even if it is directed toward the liquid crystal panel. Further, the Fresnel lens 6 may take any form as long as it is a positive lens means. For example, as shown in FIG. 8, a plano-convex lens 23 may be used and a color filter 21 may be further formed on the plane side thereof.

Furthermore, as shown in FIG. 9, it is also possible to insert a prism 24 into the intermediate portion of the light guide means and form a color filter 21 for each prism.

Note that the present invention is not limited to liquid crystal panels, but can also be applied to flat image display panels such as electroluminescent display panels, plasma display panels, photochromic display panels, and LED panels.

Effects of the Invention As explained above, the image display panel device according to the present invention can eliminate the invalid screen area that occurs when a large number of image display panels are arranged two-dimensionally, and furthermore, the luminance distribution over the entire screen can be almost uniform. A large-screen color image can be provided, resulting in a very large effect.

[Brief explanation of the drawing]

FIG. 1 is an external view of a general liquid crystal panel, FIG. 2 is a diagram for explaining the problems of the liquid crystal panel shown in FIG. 1, and FIG. 3 is an example of an image display panel device according to the present invention. FIG. 4 is a schematic diagram of a color panel, FIG. 5 is a perspective view of an embodiment of the light guide means, and FIG. 6 is a two-dimensional representation of many of the image display panels shown in FIG. 3. 7, 8, and 9 are cross-sectional views showing other embodiments of the light beam bending means and the wavelength selection means. 1...Liquid crystal panel, 4...Light guide means, 5...
...Color panel, 6...Fresnel lens, 21...
...Color filter, 23... Plano-convex lens, 24
……prism.

Claims (1)

[Scope of Claims] 1. Light guide means is arranged in front of the image display panel for each pixel, the distance between which increases as the distance from the image display panel increases, and a light beam is provided at the end or middle of the light guide means. An image display panel device characterized in that a bending means and a wavelength selection means are arranged. 2. The image display panel device according to claim 1, wherein the light guide means has an outer dimension on a side opposite to the image display panel that is the same as or larger than an outer dimension of the image display panel. 3. Claim 1, characterized in that the light guide means is a combination of thin plates in a lattice shape.
The image display panel device described in . 4. The light beam bending means bends the light beam along the substantially central axis of each of the light guide means in the normal direction of the image display panel or in a direction close to the normal line. The image display panel device described. 5. The image display panel device according to claim 1, wherein the light beam bending means is a Fresnel lens. 6. The image display panel device according to claim 1, wherein the light beam bending means is a prism. 7. The image display panel device according to claim 1, wherein the wavelength selection means forms a light absorption layer on the light beam bending means. 8. Claim 1, characterized in that the wavelength selection means forms an interference film on the light beam bending means.
The image display panel device described in . 9. The image display panel device according to claim 1, wherein the wavelength selection means is formed and integrated on the plane side of the light beam bending means. 10. The image display panel device according to claim 5, wherein the Fresnel lens is arranged with a lens surface facing toward the image display panel.