JPS593418A - Multilayered liquid crystal display element - Google Patents

Abstract

PURPOSE:To reduce the thickness of an element, to enable simultaneous display in many layers, and to improve the reliability of the element by forming the outermost substrates with glass and using a plastic film provided with a polarizer as other internal substrate. CONSTITUTION:A plastic film substrate 5 is formed by laminating polarizing film supports 71, 72 on both sides of a central polarizing film 6, and electrically conductive transparent films 81, 82 are formed on the outsides of the supports 71, 72 by sputtering or other method. The thickness of the film 5 can be regulated to 0.1-0.3mm.. The film 5 is held between upper and under glass substrates 11, 12 while interposing a liq. crystal layer 2 between the film 5 and each of the substrates 11, 12. The resulting element is impermeable to moisture and comparable to a glass element in reliability. The film 5 and the liq. crystal layers 2 can be held perfectly between the glass substrates 11, 12 to reduce the thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multilayer liquid crystal display element ζ having two or more liquid crystal layers.

Most liquid crystal display elements are single-layer liquid crystal display elements that use two glass substrates, but multilayer liquid crystal display elements that have two or more liquid crystal layers are used to increase the amount of display within the same area. has been commercialized in recent years.

These conventional multilayer elements will be explained by taking a two-layer type as an example. Figure 1 shows a three-layer, two-layer device, with upper and lower glass substrates 11 and 12 having transparent conductive film electrode patterns formed on their inner surfaces.
A liquid crystal layer 2 is provided between the intermediate glass substrate 13 on which a transparent conductive film pattern is formed, and a sealing agent 3 is applied to the periphery.
1.32 to form a cell, and the upper and lower polarizing plates 41 and 42 are attached to the external substrate. Needless to say, the inner surfaces of the substrates are each subjected to alignment treatment. Since this three-layer, two-layer element has three glass substrates, it is approximately 1.5 times thicker than a single-layer element, and the advantage of thinness of the liquid crystal display element cannot be utilized. In addition, since there is no polarizing plate between each liquid crystal layer, it is possible to display each layer independently, but if two layers are displayed at the same time, each layer has the disadvantage that the display becomes unreadable due to optical interference. ing.

In order to enable simultaneous display, a four-panel two-layer liquid crystal display element as shown in FIG. Because it is composed of
There are double drawbacks. Moreover, the cost increases due to the increase in the number of parts.

Attempts have been made to make the entire structure thinner by using a plastic film instead of a glass substrate, but this has the disadvantage of being unreliable due to the high water permeability of plastic.

An object of the present invention is to provide a thin and highly reliable multilayer simultaneous display element capable of simultaneous multilayer display.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 shows a three-layer, two-layer liquid crystal display element using a plastic film substrate 5 as an intermediate plate. FIG. 4 is a diagram showing the structure of the plastic film substrate 5 used in this example. The plastic film substrate 5 is formed by laminating polarizing film supports 71 and 72 on both sides of a central polarizing film 6, and forming transparent conductive films 81 and 82 on both outer surfaces thereof by means such as sputtering. In this case, the polarizing film support 7
As 1.72, an unstretched or uniaxially stretched film such as polyester is used7, and consideration is given to avoid generation of elliptically polarized light. The plastic film 5 thus formed can have a thickness of 01 to 0.3yMn.

Using the plastic film substrate 5 shown in FIG. 4, as shown in FIG.
．． By configuring the inside of 12 to be curved, moisture permeation can be prevented, and the reliability can be made equivalent to that of a glass element. Of course, it is also possible to completely insert the glass substrates 11 and 12 into the glass substrates 11 and 12.

Although the description has been made using a TN type liquid crystal display element, the present invention is not limited to this, and the same effect can be obtained for other liquid crystal display elements such as DSM type and guest host type that do not use a polarizing plate. Needless to say, the L obtained is great.

According to the present invention, it is possible to manufacture a liquid crystal display element having a three-layer, two-layer structure and capable of simultaneous two-layer display similar to a four-layer, two-layer element using conventional glass substrates, and the thickness of the element can be reduced to about half. is possible. Even greater effects can be obtained when using a multilayer element with three or more layers, which is 1/3 that of a conventional glass substrate element.
Can be made to the following thickness.

Furthermore, there is an advantage that inexpensive elements can be provided due to a reduction in the number of parts.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a conventional three-layer two-layer liquid crystal display element, Fig. 2 is a longitudinal cross-sectional view of a conventional four-layer two-layer liquid crystal display element, and Fig. 3 is a longitudinal cross-sectional view of a conventional four-layer two-layer liquid crystal display element.
The figure is a longitudinal cross-sectional view of a three-sheet, two-layer type liquid crystal display device showing an embodiment of the present invention, and FIG. 4 is a longitudinal cross-sectional view of an embodiment of the plastic film substrate of the present invention. 11... Upper glass substrate, 12... Lower glass substrate, 5... Plastic film substrate. Figure 1 Figure 2 Cause 3 Figure 4

Claims (1)

[Claims] In a liquid crystal display element with two or more liquid crystal layers, the outermost two
A multilayer liquid crystal display element characterized in that one of the substrates is made of glass, and the other internal substrates are made of a plastic film with a polarizer.