JPH05216071A - Substrate for light valve - Google Patents

Abstract

PURPOSE:To obtain the substrate for a light valve having picture elements of a high opening rate by forming the picture element electrodes of the adjacent picture elements of a structure having superposed parts on each other via insulating films. CONSTITUTION:Switching elements 102 consisting of TFTs and diodes made of polysilicon or amorphous silicon, etc., or single crystalline silicon transistors, etc., for the picture elements are formed on a transparent substrate 101. The picture element electrodes 103 are connected to the switching elements 102 of the respective picture elements. The picture element electrodes 103 of the adjacent picture elements are formed so as to have the parts 104 superposed on each other via the insulating films 106. Then, a liquid crystal which is the light valve material does not exist in the parts which cannot be controlled in the case of packaging of a liquid crystal cell, etc., on the substrate and forming of the light valve device. Therefore incident light can be shut off only by setting the voltage to be supplied to the picture element electrodes 103 in the case of shutting off of the incident light. The light shielding film called as a black matrix on the opposite substrate is dispensed with and the opening rate is improved. Bright images are thus obtd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a light valve substrate.

[0002]

2. Description of the Related Art A conventional light valve substrate has a structure having a gap 105 between pixel electrodes 103 of adjacent pixels as shown in FIG.

[0003]

However, in the light valve substrate having the above structure, when light transmission must be blocked by using the light valve material at the time of light irradiation, the light valve material on the gap between the pixel electrodes is Since it does not work, incident light leaks from this gap. Therefore, in general, a light-shielding film larger than this gap is provided on the counter substrate to prevent light leakage. However, there has been a problem that the area ratio of the light-shielding film increases with the miniaturization of pixels, and the aperture ratio of the entire pixels decreases, resulting in a dark image. Further, the subordinate black line appearing on the image gives the viewer an unpleasant feeling.

It is an object of the present invention to solve the above problems and provide a light valve substrate having pixels with a high aperture ratio.

[0005]

The main means adopted by the light valve substrate of the present invention to achieve the above-mentioned object is that the pixel electrodes of adjacent pixels have a structure in which they overlap each other. ..

[0006]

As described above, according to the present invention, a light valve substrate having pixels having a high aperture ratio can be obtained as compared with a light valve substrate having pixels having a conventional structure.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of an active matrix type light valve substrate of the present invention. A switching element 102 including a TFT or a diode made of polysilicon or amorphous silicon of a pixel, and a single crystal silicon transistor is formed on a transparent substrate 101, and a pixel electrode 103 is connected to the switching element 102 of each pixel. There is. The pixel electrodes 103 of adjacent pixels are overlapped with each other via the insulating film 106.
4 is formed. The pixel electrode 10
3 is made of polysilicon, ITO or the like, and has an insulating film 10
6 is made of SiO ₂ , SiN or the like.

According to the embodiment shown in FIGS. 1 and 2, since the adjacent pixel electrodes have overlapping portions with each other, when a light valve device is formed by mounting a liquid crystal cell or the like on this substrate, a light valve material is formed. There is no part that cannot control the liquid crystal. Therefore, in order to block the incident light, it is possible to perform it only by setting the voltage supplied to the pixel electrode 103, and the light-shielding film called a black matrix on the counter substrate, which is conventionally required, is unnecessary, so that the aperture ratio is Improved and brighter images are obtained.
Furthermore, there are no unpleasant black lines running sideways in the resulting image.

[0009]

As described above, according to the present invention, a light valve substrate having a higher aperture ratio can be obtained as compared with a conventional light valve substrate having a pixel electrode structure.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an active matrix type light valve substrate of the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of a simple matrix type light valve substrate according to the present invention.

FIG. 3 is a schematic cross-sectional view showing a conventional light valve substrate.

[Explanation of symbols]

 101 transparent substrate 102 switching element 103 pixel electrode 104 overlapping portion 105 gap 106 insulating film

Claims (1)

[Claims] 1. A substrate for a liquid crystal panel, in which at least a plurality of pixel electrodes independent of each other are formed, the adjacent pixel electrodes have overlapping portions with each other with an insulating film interposed therebetween.