JPS61100787A - Transparent ceramic display unit - 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 (Field of Commercial Use) The present invention relates to a display device using transparent porcelain having an electro-optical effect.

(Prior art and its problems) PLZ is a transparent electro-optical porcelain made by adding lanthanum to zircon/lead titanate and using a hot press method.
The one called T is well known. This PLZ
For T, a -order electro-optic effect, a second-order electro-optic effect, or an electric memory effect can be selected depending on its composition. However, with the -order electro-optic effect, there is little change in the refractive index in response to an electric field, making it difficult to drive at low voltages, and with the memory effect, changes in the refractive index remain, making it difficult to apply to display devices and optical screens. . Currently, for display devices other than image memory and optical shutters, PL exhibits a secondary electro-optic effect.
65mo1% PbZr01 p35mo1% containing 9at% lanthanum called ZT9/65/35
PbT2O3 composition is often used. The features of the one-light shutter for a display device using this PLZT9/65/35 are that it is a solid state, that high-speed switching is possible, and that the angle dependence of contrast is small. Therefore, it is expected that it will continue to develop. Conventionally, PLZT has been used as display devices and optical shutters.
When using a secondary electro-optic material such as No. 9/65/35, it is necessary to adopt a structure in which porcelain with electrodes is sandwiched between two polarizing plates. If the polarization directions of the polarizing plates are orthogonal to each other, the transmitted light intensity will be maximum at the voltage λ V2 vo = d(i), which is called the half-wave voltage, and the voltage is applied. 'i
ll! , the area between the electrodes is bright, and the other areas where no voltage is applied are dark. Here, d is the distance between the electrodes, λ is the wavelength of light, n is the refractive index, R is the second-order electro-optic coefficient, and l is the thickness of the transparent porcelain. On the other hand, when the polarization directions of the polarizing plates are parallel to each other, the part to which the half-wave voltage is applied is
Other parts are bright.

In order to utilize the second-order pneumatic effect, it is necessary to apply an electric field parallel to the surface of the substrate, and in the area where the electro-optic effect is utilized, the electrodes are often of a two-pair structure and comb-shaped. The electrode structure used in a display device considered by the conventional method is as shown in FIG.

An extraction electrode 13 is formed vertically on a transparent porcelain substrate 11 so as to be connected to one side of the transparent comb-shaped electrode 12 constituting each dot, and an opaque electrode 13 is formed horizontally to be connected to the other side of the comb-shaped electrode. In this structure, an insulator 14 is formed between the positive voltage electrode and each opaque electrode serving as the ground electrode at the intersection thereof to prevent short circuits between the vertical and horizontal electrodes.

In the conventional device as shown in Fig. 3, if the distance between each dot is narrowed in order to form dots at high density, the number of extraction electrodes passing between the dots is severely restricted, and the number of extraction electrodes passing between the dots becomes narrower. Electric fields are generated between the dots and between the dots, allowing light to pass through or be blocked in those areas, causing it to operate in areas where it is not needed.

In addition, in order to prevent operation between dots, between extraction electrodes, and between dots and extraction electrodes, it is necessary to pre-separate each dot and between extraction electrodes, which has the disadvantage of not being able to arrange dots in a high density. .

(Object of the Invention) An object of the present invention is to provide a display device that turns on and off light only within a plurality of dots provided on a plane, which could not be obtained using conventional methods.

(Structure of the Invention) That is, in the present invention, a plurality of dot portions each consisting of a pair of transparent comb-shaped electrodes are formed on a transparent porcelain substrate having an electro-optical effect, and each dot portion is connected to one of the transparent comb-shaped electrodes. A plurality of first opaque electrodes, the other transparent comb-shaped electrode, and a plurality of continuous second opaque electrodes are formed in a lattice shape, and at the intersection of the first and second opaque electrodes, In a transparent porcelain display device having a structure in which an insulating thin film is formed to insulate between the electrodes, the opaque electrode and the opaque electrode are formed between two adjacent comb-shaped transparent electrodes between each dot, and on one of these electrodes. This transparent porcelain display device is characterized in that an insulating thin film is formed to insulate two comb-shaped transparent electrodes.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a portion of electrodes constituting a display device in an embodiment of the present invention. A transparent electrode ITO formed on a transparent porcelain PLZT (composition ratio 9/65/35) substrate 11 is sputtered and chemically etched to form a comb-shaped electrode 12 constituting each dot. On top of that, the adjacent t
1. '8 i04 @g 14 Sputter between the electrodes and on one electrode to avoid short circuit when all 13 electrodes are connected.
I kicked it. Thereafter, an opaque AI electrode was formed as an opaque electrode 13 on the 840W thin film 14 and on one of the comb-shaped electrodes of each dot by vapor deposition. Then, before further forming an opaque electrode on the opaque electrode by vapor deposition in a direction crossing the opaque electrode, a 5ift insulating thin film 14 is applied by sputtering at the part that intersects with the opaque electrode that has already been formed. An opaque electrode was formed to be connected to one electrode.

In such a structure, each dot is surrounded by an extraction electrode made of opaque AI, so the space between each dot is opaque to light, and only the inside of each dot operates.

Figure 2 (a) and (b) are respectively A-A' in Figure 1.
・This shows the cross section between BB'. The size of the transparent magnet used is μm2. The width of the comb-shaped electrodes is 25 μm, and the distance between each electrode is 50 μm. The distance between the dots is 25 μm. On top of that, a 1 csiOt thin film of about 1 μm was formed by sputtering, and an opaque A film with a width of about 50 μm was formed on top of that by sputtering.
11! The poles were formed vertically and horizontally.

By adopting the above configuration, approximately 90 Volt (
The light could be turned on and off within each dot using the D voltage, and a display device with sufficiently high resolution compared to the conventional one could be formed.

+ (Effects of the Invention) In the display device formed according to the present invention, the light can be turned on and off only within each dot, and the distance between each dot can be narrowed, so that a high-resolution flat display device can be realized. Now I can make it.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention. FIG. 2 is a sectional view between A-A' and B-B' shown in FIG. Figure 3 shows a conventionally used electrode structure. In the figure, 11 is a transparent porcelain substrate, 12 is a transparent electrode, 1
3 is an opaque electrode, and 14 is an insulating film.

Claims (1)

[Claims] A plurality of dot portions consisting of a pair of transparent comb-shaped electrodes are formed on a transparent porcelain substrate having an electro-optic effect, and a plurality of first opaque electrodes are connected to one transparent comb-shaped electrode of each dot portion. A plurality of second opaque electrodes connected to the other transparent comb-shaped electrode are formed in a grid shape, and the first and second opaque electrodes are connected to the other transparent comb-shaped electrode.
In a transparent porcelain display device having a structure in which an insulating thin film is formed at the intersection of the opaque electrodes to insulate between the electrodes, there is a gap between two adjacent comb-shaped transparent electrodes between each dot and one of the electrodes. A transparent porcelain display device characterized in that an insulating thin film is formed thereon to insulate the opaque electrode and the two comb-shaped transparent electrodes.