JPS6026319A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To extend the visual region and to make the developed color state of a liq. crystal, that is, a display clear by using a micro-encapsulated liq. crystal and forming a black coating on one of meshed electrodes. CONSTITUTION:Electrodes 3, 5 are formed on the confronting surfaces of front and rear transparent substrates 1, 2, a black coating is formed on the electrode 3, and a liq. crystal layer 6 of a micro-encapsulated liq. crystal is held between the electrode 5 and the coating 4 to manufacture a liq. crystal display device. When an electric field is applied to the layer 6, an image can be clearly displayed in a high contrast state. The visual region is wide, and the image can be seen at any position, so the display device is used as the display device of an advertising medium or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device having microencapsulated liquid crystal.

Conventionally, R-methods have been developed to allow liquid crystals to be handled in the same way as solid objects.
There are many types of cholesteric liquid crystal microcuffs, applications of this technology for printing, and applications for constantly changing temperature indicators.

In such a micro-encapsulated solid body of liquid crystal, the molecular arrangement of the liquid crystal in each capsule changes equally according to changes in temperature, etc., so each capsule, which is a sphere, is subject to a directional force of ), the amount of light transmitted and reflected by each liquid crystal is the same, and there is no limit to the viewing range, making it possible to check, for example, the temperature display from any direction.

On the other hand, it is desired to provide a display device such as an advertising device that can display a wide viewing range by using micro-encapsulated liquid crystal in a liquid crystal display panel or the like.

However, there is a problem that the difference between the original amount of reflection and the amount of transmission for each microcapsule is small, and the contrast of the reflected image to be displayed is poor, making it impossible to display a clear image.

The present invention uses microencapsulated liquid crystal as the liquid crystal of a liquid crystal cell that is driven by the application of an electric field, and in addition to this, a liquid crystal display device in which a blank coating is applied to one side of the meshed electrode, for example, is used. The present invention provides a device which has a wide viewing range and allows the display state of the liquid crystal, for example, the color development state, to be clearly seen.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 specifically shows one embodiment. In the figure, reference numeral 1.2 is a transparent substrate of η, such as a film or glass, on each of the front and back sides, and a mesh electrode 3 is provided on the transparent substrate 2 on the back side 1.nl This mesh electrode 3 A blank coating 4 is applied to the surface of the transparent substrate 11. This blank coating acts as an absorption layer for incident light, and acts to clarify the light emission and coloring state of the liquid crystal, as will be described later. Note that the mesh electrode 3 has a property of transmitting, for example, about 30% of the amount of incident light.

Reference numeral 5 denotes a transparent electrode provided on one surface of the transparent substrate on the side of the transparent substrate 2 by means such as vapor deposition or etching. A voltage of γ1° is applied between the transparent electrode 5 and the mesh electrode 3, for example. An electric field is applied to each liquid crystal cell arranged in a matrix arrangement to excite L.

6 is a micro-encapsulated liquid crystal layer interposed between the blank coating 4 on the mesh electrode 3 and the transparent electrode 5.

Note that this micro-encapsulated liquid crystal layer is prepared by dispersing the liquid crystal material into fine particles, adding a hydrophilic polymer thereto, and then forming the liquid crystal material into fine particles. This is done by surrounding the liquid crystal material.

In the liquid crystal display device V having such a configuration, a part of the light L1 incident on the transparent substrate 1 from the outside is directly reflected by the capsules of each micro-encapsulated liquid crystal layer, and the remaining part is reflected as a black light absorber. Absorbed by coating 4. On the other hand, when an electric field acts on the liquid crystal in each capsule due to the voltage input between the transparent electrode 5 and the mesh electrode 3, the alignment of the liquid crystal molecules is disturbed, so that the incident light is scattered and appears white. This white color enhances the contrast with the flank coating, making the graphic display clearer. In this case, it is possible to change the color depending on the birefringence of the incident light and the difference in optical path difference depending on the frequency. Contrast If can be obtained.

Further, in the image display as described above, since the liquid crystal is microencapsulated, each capsule has the same display response to incident light, and the transparent substrate 1 spreads. Therefore, this display device is hardly limited by the installation location and is of similar practical benefit.

As explained above, according to the present invention, t electrodes are provided on the opposing surfaces of two transparent substrates, one of these electrodes is blank coated, and the above electrode is coated with a blank coating. By providing a micro-encapsulated liquid crystal layer between the other side of the liquid crystal layer and the black coating, an image displayed by applying an electric field to the liquid crystal layer can be attached to the black coating in a high contrast state. In addition to being able to display the image clearly, the viewing range is expanded, the image can be seen at any mounting position, and the display function, advertising function, etc. can be expanded.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the liquid crystal display device of the present invention. 1.2... Transparent substrate 3.5... Electrode 4... Blank coating 6... Liquid crystal layer Patent applicant Tadashi Sekiguchi

Claims (1)

[Claims] Electrodes are arranged on the opposing surfaces of two transparent substrates, the front and back,
A liquid crystal display device characterized in that a blank coating is applied to one of the electrodes, and a microencapsulated liquid crystal layer is interposed between the other electrode and the black coating.