JPS58122587A - Fet type liquid crystal display element - 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 The present invention relates to a liquid crystal display device, and more particularly to a field effect liquid crystal display device capable of displaying dots.

1 and 2 are diagrams showing a conventional liquid crystal display element capable of displaying dots. FIG. 1 is a plane rkJ diagram of the liquid crystal display element, and FIG. 2 is a cutaway front view thereof.

1g of transparent insulating substrate made of two pieces of glass etc.

1b are arranged to face each other with a predetermined gap. On the upper surface of the lower insulating substrate lα is a long and narrow horizontal strip electrode 2.
A large number of elongated vertical strip electrodes 2b are provided at equal intervals on the lower surface of the upper insulating substrate 1b. And the lower insulating substrate 1a and the first insulating substrate 1b
By arranging them to face each other, the horizontal strip electrode 2α and the vertical strip electrode 2b cross each other while being vertically separated, as shown in Figure #11. The left end of each horizontal strip electrode 2α is exposed from the upper insulating substrate 1b to form a horizontal electrode contact portion 3cL, while the front end of each vertical strip electrode 2b is exposed on the lower insulating substrate 1α.
Vertical electrode contact portions 3bf are formed to be more exposed.

As shown in Figure 2, the vicinity of the outer eyelids of the lower insulating substrate lcL and the upper insulating substrate 1b are sealed with a sealing material 4, and a predetermined liquid crystal is placed between the lower insulating substrate 1eL and the upper insulating substrate 1b. The liquid crystal layer 5 is formed by encapsulating the composition.

For example, if you want to display the image at the diagonally shaded position as shown in No. 1N, the fourth electric image from the front of the horizontal band-shaped electrode 28 and the second electrode from the left of the vertical band-shaped electrode 2b are select. Then, by bringing voltage application terminals (not shown) into contact with the horizontal electrode contact portion 3α and the vertical electrode contact portion 3b of the electrodes, a high electric field is partially applied to the liquid crystal layer 5 to display dots. It is a mechanism to do this.

However, in this conventional liquid crystal display element, if the display area is large and the display point is small, the number of horizontal strip electrodes and vertical strip electrodes increases accordingly, which complicates the drive circuit and increases costs. .

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art and to provide a field-effect liquid crystal display element that is simple in construction and inexpensive.

In order to achieve this object, the present invention provides an insulating substrate that covers almost the entire surface of one of two insulating substrates, such as glass plates, which are arranged facing each other and have a liquid crystal layer formed between them. An electrode is provided on the inner surface of the other insulating substrate, and no electrode is provided on the inner surface of the other insulating substrate, and a write terminal movable along the surface of the insulating substrate is arranged on the outside of this latter insulating substrate. The device is characterized in that by applying a voltage between the write terminal and the electrode, a high electric field is partially applied to the liquid crystal layer to perform display.

Next, embodiments of the present invention will be described with reference to the drawings. 3 and 4 are diagrams showing a first embodiment of the present invention, in which Figure M3 is a plan view of a field-effect liquid crystal display element, and Figure @4 is a cutaway front view thereof.

Shima Akira insulating plates 11α and l consisting of two glass plates, etc.
G and lb are arranged so as to face each other with a predetermined gap (approximately 20 μm) between them. The upper surface of the lower insulating substrate 11G (
As shown in Figure 3, on the inner surface (inner surface), almost the entire surface (in other words, the entire surface area of the main display area) is coated with a transparent fi-electron 12 made of indium oxide, for example, by vapor deposition. The left end of the electrode 12 protrudes from the upper insulating plate 11b to form an electrode contact portion 13.
A thinner one than the da 11α is used, and this k is not provided with an electrode.

As shown in FIG. 4, the vicinity of the outer peripheries of the lower insulating substrate 11α and the upper insulating substrate 11b are sealed with a sealing material 14 such as epoxy resin.

The relationship between the lower insulating substrate 11α and the upper insulating substrate 11b is as follows.
A liquid crystal layer 15 is formed by injecting a predetermined liquid crystal composition. A writing terminal bar 1 is provided above the first insulating board 11b.
6 is disposed, and its lower end is pointed as shown in FIG. 4, and lightly contacts the upper surface of the upper insulating substrate 11b.

This writing terminal bar 16 can be moved in the X direction and the Y direction as shown by the arrows by a terminal shaft drive device f (details will be explained in the 1111!2 embodiment).

By applying a predetermined voltage between the writing terminal bar 16 and the electrode 12, a high electric field is locally applied to the portion of the liquid crystal layer 15 corresponding to the writing terminal bar 16, and a dot is displayed. Ru.

#! of the present invention in FIGS. 5 and 6! FIG. 5 is a plan view of the twisted material type liquid crystal display device according to the second embodiment, and FIG. 6 is a cutaway front view thereof.

The lower insulating substrate t&jllcL is made of a soda glass plate with a − side of 100 m, the other side of 135+w, and a thickness of 1.1 m. On the other hand, the upper insulating substrate 11b has a − side of 100 cm and another side of 105 cm. It is made of soda gas board with a thickness of 05cm.
A material that is considerably thinner than the insulating substrate 11α is used. These insulating substrates 11a.

11b is thoroughly washed and immersed in an organic silicon solution (product name N3-10, manufactured by Nippon Ichidasha), then pulled up and baked at 500°C to form an anti-alkali layer made of nitric oxide on the substrate surface (not shown). form.

A bright electrode 12 made of indium oxide is provided over the entire surface only on the inner surface of the upper insulating substrate 11α by a vapor deposition method. After that, there is a double-edged insulating substrate 11α.

1. Add 1 lb to silane coupling agent (manufactured by Toshisha, product name 8)
H6020) After immersing in the solution and pulling it out,
Heat treatment is performed at ℃, and the surface of the substrate is rubbed in one direction with absorbent cotton for orientation treatment. A sealing material 14 made of epoxy resin containing glass beads is applied to the outer periphery of the upper insulating substrate 11b by a screen printing method, the lower insulating substrate 11α and the upper insulating substrate llb are bonded together, and the sealing material 14 is heated and cured. let

Nematic liquid crystal (
(product name GR-61) manufactured by Make Co., Ltd. is enclosed, and polarizing plates 175 and 17b are attached to the lower surface of the lower insulating substrate 118 and the upper surface of the upper insulating substrate 11b, respectively.

A writing terminal bar 16 is arranged above this upper polarizing plate 17b, and its lower end is pointed as shown in FIG.
It lightly contacts Ifi of the first polarizing plate 17b. Next, the drive device for this writing pseudokeyaki keyaki 16 will be explained.

A pair of #11 rails 18, 18 extending parallel to the arrow Y direction (see Figure 15) are fixed to the upper left end and the right end upper blade of the upper insulating base &11b, respectively. The rack is provided with one storage rail 19. This ts2 rail 19 has bearings (not shown)
This allows rules 18 and 18k to be freely moved in the direction of arrow Y.

The second rail 19 has a guide groove 2 along its longitudinal direction.
0 is formed, and its length is designed to be approximately the same as the width dimension of the upper insulating substrate 11b. A paired built-in carriage 21 is mounted on the second rail 19J so as to be movable along the longitudinal direction of the IJA2 rail 19, and the write terminal bar 16 held on this carriage 21 It passes through the guide groove 20 of the storage rail 19 and reaches the upper end light plate 17b. Guide groove 2
The movement range of the write terminal bar 16 in the X direction is restricted by the left false end and right end of 0.

As shown in FIG. 5, both ends of a Y-direction pulling rope 22 stretched in the Y direction are fixed to the second rail 19, and the ropes 22 are wound around a driving pulley 23 and a driven pulley 24, respectively. A second rail moving motor 25, which is capable of forward and reverse rotation, is connected to the drive pulley 23. Further, both ends of an X-direction tow rope 26 stretched in the X direction are fixed to the carriage 21, and the ropes 26 are wound around a drive pulley 27 and a driven pulley 28, respectively, and the drive pulleys 27&: are rotated in forward and reverse directions. A motor 29 for possible carriage movement is connected. Note that these X-direction tow ropes 26. Drive pulley 27° Driven pulley 28. The carriage moving motor 29 can move together with the )12 rail 19. Therefore, by rotating the second rail moving motor 25 forward or backward, the writing terminal bar 16 is transferred together with the second rail 19 in the direction of arrow Y, and by rotating the carriage moving motor 29 forward or backward, , the writing terminal bar 16 is indicated by the arrow
transported in the direction. By driving these motors 25 and 29 appropriately, the writing terminal bar 16 is
You can move it freely on the top.

In FIG. 5, 30 is a power source, one terminal of which is connected to the electrode contact portion 13 of the electrode 12, and the other terminal connected to the writing terminal $16. Electrode 12 and writing terminal bar 1
When DC1,3K V is applied between the terminal bar 16 and the upper polarizing plate 17b and the terminal bar 16 for writing is moved while lightly touching the upper polarizing plate 17b, a dot is displayed at the position corresponding to the part where the terminal bar 16 for writing contacts the upper polarizing plate 17b. was made, and even after the writing terminal bar 16 had moved, it was held for several seconds, and a graphical representation of the movement of the terminal bar 16 was made.

After forming an anti-alkali dove and a transparent electrode on an insulating substrate in the same manner as in the second embodiment, the insulating substrate 11 (1,llb) was immersed in a chromium complex solution and pulled up to 130 ml.
A heat treatment is performed at 0 to form a vertically aligned film. A liquid crystal cell is assembled using this, and a dichroic dye (manufactured by BDH Co., Ltd.) is used to assemble a liquid crystal cell.
A nematic liquid crystal with negative zero anisotropy (manufactured by Chisso Corporation, product name KN-24) containing 1% of product name D-5) is sealed. Then, there is a DC voltage between the electrode 12 and the writing terminal bar 16.
A blue dot was displayed by applying 1,5 KV and lightly bringing the writing terminal bar 16 into contact with the upper insulating substrate 11b.

FIG. 7 is a cutaway front view of a field effect liquid crystal display element according to a third embodiment of the present invention. In the case of this embodiment, a transparent electrode 12 is formed over almost the entire surface of the lower insulating substrate 11α, similar to the second embodiment E, and horizontal alignment processing is performed. On the other hand, the upper insulating substrate 11b is made of a polyester film with a thickness of 100 μm, and an aqueous solution of polyvinyl alcohol is applied to the surface thereof in contact with the liquid crystal layer 15, and then dried to form the horizontal alignment film 31. 32 is a cell gear with a black pigmented liquid crystal (manufactured by Roche, product name RO-8A-653)
) is injected into the lower insulating substrate 11a and the upper insulating substrate 11.
The outer periphery of b is heat-sealed with a vinyl acetate resin hot-melt sealing material. Then, the writing terminal bar 16 is placed on the upper insulating substrate 11b, and when KAC 300v is applied between this and the electrode 12 and the writing terminal bar 16 is brought into contact with the upper insulating substrate 11b, the back surface is black but white. A dot is displayed.

The present invention has the above-described structure, and can provide a field-effect liquid crystal display element with a simple structure and low cost.

[Brief explanation of the drawing]

W, Figures 1 and 2 are a plan view and a cutaway front view of a conventional liquid crystal display element, and Figures 3 and 4 are a diagram of a conventional liquid crystal display element.
5 and 6 are a plan view and a cut front view of a liquid crystal display element according to a second embodiment of the present invention, and FIG. 7 is a cut front view of a liquid crystal display element according to a second embodiment of the present invention. FIG. 7 is a cutaway front view of a liquid crystal display element according to a third example. 115...Lower insulating board, llb...
・Upper insulating substrate, 12... Electrode, 15.
...Liquid crystal layer, 16...Writing terminal bar Tl5lj Neo 3 Figure 74 μ

Claims (1)

[Claims] (1) Of two insulating substrates that are arranged facing each other and have a liquid crystal layer formed between them, an electrode is provided on the inward side of one of the insulating substrates over almost the entire surface, and an electrode is provided on the inward side of one of the insulating substrates, and & No electrode is provided on the inner surface of the root, and a writing terminal movable along the surface of the insulating substrate is arranged on the outside of this latter insulating substrate, and between this writing terminal and the electrode. By applying a voltage to ! A lid field effect type crystal display element characterized by having a W4 structure in which a high electric field is partially applied to a liquid crystal layer to perform display. (2) Claims characterized in that the display method is a twisted-nematic liquid crystal display method.
1) The field-effect liquid crystal display element described in item 1). (3) Claim 1ll (field-effect liquid crystal display element according to claim 11) characterized in that the display method is a guest-host liquid crystal display method. +41 The display method is a nematic-Fresderic phase transition liquid crystal A field-effect liquid crystal display element according to claim 11, characterized in that it is a display force type. (5) The insulating substrate on the side where the electrode is not provided is a synthetic
A field-effect liquid crystal display device according to claim 11, characterized in that it has been cured for 11 days from the m lli* film.