JPS62200330A - Phase transition type liquid crystal display device - Google Patents

Abstract

PURPOSE:To make a grating-shaped pattern smaller by making the width of X or Y line electrodes in gap parts between picture elements narrower than the width of picture element areas. CONSTITUTION:A liquid crystal panel is used where X line electrodes 3 notched in parts corresponding to gap parts 2 between picture elements and similarly notched Y line electrodes 4 are put one over the other. Though a liquid crystal is in the scattered state in a narrow part 5 of the gap part 2 because one of electrodes 3 and 4 exists in only the narrow part 5 of the gap part 2, this unnecessary narrow part 5 is smaller than the grating pattern. If picture element areas 1 are connected by metallic narrow wires, the narrow part 5 is made smaller furthermore. By such constitution, the unnecessary grating-shaped pattern is reduced to improve the display quality.

Description

[Detailed Description of the Invention] [Summary] The present invention is directed to a crystal display that utilizes a phase transition between cholesteritic nematic phases, in which vertical and horizontal lattice pattern displays occur due to crystals being in a scattering state in the gaps between pixels. In order to reduce this, the shape of the line electrodes is different from the conventional stripe shape, thereby reducing the unnecessary display area and improving the display quality.

[Industrial application field]

The present invention relates to a liquid crystal display that utilizes phase transition between cholesteric and nematic phases.

In phase change liquid crystal displays, the light scattering properties of the cholesteric phase and the light transparency of the nematic phase are used to
Perform display. In this case, in a simple matrix type liquid crystal display in which the striped electrodes are orthogonal to each other through the liquid crystal layer, the liquid crystal in the gaps between the picture elements located on the sides of the picture elements becomes scattered, and unnecessary It will be displayed. This solution is needed because this unnecessary grid pattern degrades the display quality of the display.

[Conventional technology]

Simple matrix liquid crystal displays using cholesteric-nematic phase transition liquid crystals are
Two substrates on which striped transparent electrodes running in the direction are formed are glued together with minute gears and protrusions, and a cholesteric-nematic phase change liquid crystal is sealed in this minute gap.

FIG. 3 shows the applied voltage and light transmittance of the phase change liquid crystal display element, and is a hysteresis curve. There is a difference in light transmittance when the applied voltage increases and decreases, and by maintaining the voltage at Vo, it is possible to select the scattering state B and the transmitting state A.

[Problem that the invention seeks to solve]

FIG. 2 is a partially enlarged plan view of a conventional liquid crystal display panel. The transparent electrodes formed in conventional liquid crystal display panels are striped electrodes with the same width.
In the figure, 1 is the X direction.

This is a picture element region where the electrodes in the Y direction overlap, and the other grid-like parts are picture element gaps 2. This picture element gap 2
In particular, the shaded area is the area where either the X electrode or the Y electrode is formed. When a voltage is applied to this portion, it becomes a scattering state, and this state cannot be controlled from the drive circuit side to return to the original transparent state. The reason for this is thought to be that the liquid crystal in the picture element gap 2 becomes a focal comic. When a conventional panel is used, an unnecessary grid pattern is always superimposed on the display pattern, degrading the display quality. This effect is particularly significant when a pattern is displayed by enlarging it.

[Means to solve the problem]

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned conventional problems, and the purpose is to provide a phase change liquid crystal display using a cholesteric-nematic phase change liquid crystal and having line electrodes orthogonal to each other through a liquid crystal layer. This is achieved by a phase change type liquid crystal display characterized in that the width of the line electrode (3) or (4) between each picture element area (1) is narrower than the electrode width of the picture element area.

[Effect]

The width of the line electrodes of the phase change type liquid crystal display of the present invention is not the same width as in the conventional case, but is formed thin between each pixel area. Therefore, unnecessary voltage is applied in the gap between the pixel elements, resulting in scattering. The display quality is improved by reducing the number of parts that change.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 2 shows an X electrode pattern according to an embodiment of the present invention formed on one substrate of a liquid crystal panel, and FIG. 3 shows a Y electrode pattern similarly formed on the other substrate. 1st
The figure shows a plan view of a liquid crystal panel in which the electrode patterns of FIGS. 2 and 3 are superimposed.

In the present invention, as shown in FIG. 2, an X-line electrode 3 having a notch and a Y-line electrode 4 having a notch as shown in FIG. A liquid crystal panel is manufactured by overlapping the two as shown in FIG.

With this configuration, the first figure number = each picture element area 1 as shown.
Since either the X or Y line electrode is present only in the shaded area in the picture element gap 2 between the pixels, the liquid crystal is in a scattered state, but compared to the conventional case shown in Figure 4, this unnecessary area is The display quality is improved because the number of pixels is small. In the above embodiment, the details 5 are formed by patterning the X-line electrodes and Y-line electrodes (for example, ITO'), but the details 5 are formed by patterning the The connection may be made using a separate thin metal wire (for example, by vapor deposition of aluminum).

By using thin metal wires, the details 5 of the electrodes can be made even narrower, and the display quality is further improved because unnecessary parts are reduced accordingly.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the vertical and horizontal lattice-like unnecessary display parts that occur in conventional electrode patterning shapes by simply changing the electrode pattern shape, and the display quality of the liquid crystal display can be improved. be. This effect is particularly great when this display is used for enlarged projection.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged plan view of a liquid crystal panel according to an embodiment of the present invention, FIG. 2 is an X electrode pattern of a liquid crystal panel according to an embodiment of the present invention, FIG. 3 is the same Y electrode pattern, and FIG. 4 is a conventional liquid crystal panel. FIG. 5, which is a partially enlarged plan view of the panel, shows an applied voltage-light transmittance characteristic diagram of the phase change liquid crystal element. In the figure, 1 is the picture element area. 2 is a picture element gap, 3 is an X line electrode, 4 is a Y line electrode, and 5 is a detail. To the λ product of Nezumei 0's style 1, Part 0, 7 minutes, Expanded illustrations.
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Claims (2)

[Claims] (1) In a phase change type liquid crystal display that uses cholesteric-nematic phase change liquid crystal and has line electrodes orthogonal to each other through a liquid crystal layer, the line electrodes (3) or (4) between each picture element area (1) ) is narrower than the electrode width of the picture element region. (2) A phase change type liquid crystal display according to claim 1, characterized in that each picture element region is connected by a thin metal wire.