JPS58163920A - Liquid crystal display - Google Patents

Abstract

PURPOSE:To display type numbers, low number, etc. of large quantity of information in an easy to see way by forming the punched part for character, figure, symbol, etc. to a part of the polarizing plate of a liquid crystal display by blanking or the like. CONSTITUTION:A cover plate 11 and a back plate 12 which are provided with desired transparent electrode patterns on their respective inside surfaces are placed so as to face each other at a prescribed space, and the circumference thereof is sealed with a sealant 13, whereafter a liquid crystal 14 is injected into the inside thereof. A polarizing plate 21 formed with punched parts of the shapes for characters, figures, symbols, etc. in a part thereof is adhered to a cover plate 11, and a polarizing plate 22 is adhered to the plate 12 in such a way that the axis of polarization thereof intersects orthogonally with the axis of polarization of the plate 21, whereby the intended liquid crystal display is obtained. Thus the easy to see transparent part formed with the shapes of characters, figures, symbols, etc. in the opaque part formed by the non-transmission of incident light through the liquid crystal display is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device, and more particularly to a polarizing plate for a liquid crystal display device.

In recent years, development of display devices using liquid crystal displays has been active, and liquid crystal displays have gained a large market as portable display devices for watches, desks, and the like. An example of a display method of a display device using such a liquid crystal display is 1.
From the current product planning perspective, this is close to 0, which means low power consumption.

The twisted nematic ('l'twisted nematic; hereinafter abbreviated as TN) display method satisfies the conditions most satisfactorily because of the possibility of time-division driving and ease of viewing, and is generally widely used. Therefore, the present invention will also be explained based on the TN display method.

A liquid crystal display device using the TN display method was developed by the Japanese Patent Publication Publication No. 51-1.
3666, and a schematic cross-sectional view of such a TN type liquid crystal display device is shown in FIG. When looking at the incident light 5 directly above the liquid crystal display device, depending on the configuration of the liquid crystal display device, 1. It appears divided into three areas: ■ and 1. When the upper and lower polarizing plates 1.1' are installed with their polarization axes perpendicular to each other so that a positive display is obtained when a voltage is applied between the electrodes of the upper and lower glass substrates with transparent conductive films 2.2', the area of ■ In this case, since the polarization axes of the upper and lower polarizing plates are at right angles, the incident light 5 does not pass through the liquid crystal display and appears opaque, that is, black.

In addition, in the region (2), sealing materials 3, 3' are provided between the glass substrates 2, 2' with transparent conductive films, but the appearance is opaque like the region I. On the other hand, in the region l, since the liquid crystal 4 has optical rotation, the incident light 5 passes through the liquid crystal display device and becomes transparent. Region I is opaque because the polarization axes of the upper and lower polarizing plates are perpendicular to each other, so for example, if you make a hole in either the upper or lower polarizing plate, you can create a transparent part in the shape of the hole in the opaque part. can. In addition, in the region (■), it is possible to create a hole-shaped part in the color of the sealing material in the opaque part.

On the other hand, when displaying the model number on a liquid crystal display device.

Conventionally, the model number was expressed by etching the transparent conductive film in a portion that had no relation to the display. Furthermore, when assigning a lot number, colored ink was printed in a bar shape on the side of the liquid crystal display.

However, when displaying the model number using an etched transparent conductive film, it has the disadvantage that it is very difficult to see, and it is no exaggeration to say that it is not visible at all, especially when a polarizing plate is attached. Furthermore, when a lot number is given by printing colored ink in the form of a bar on the side of the liquid crystal display device, there is a disadvantage that the amount of information is clearly inferior to that of a single character number.

The present invention has been made to overcome these drawbacks by making a hole in one of the polarizing plates mentioned above, and creating a transparent part in the shape of the hole in the opaque part. The moon phase is shown in the display, -t number display, etc.

Examples of the present invention will be shown and explained below. FIG. 2(a) shows a cross-sectional view of one embodiment of the present invention, showing a cover plate 11 and a back plate 12 on which a desired transparent electrode pattern is formed.
is sealed with adhesive 13, an internal liquid crystal 14 is injected, a polarizing plate 21 with a hole called NEEC in the polarizing plate in the area marked with ■ in Fig. 1 is attached to the cover plate, and finally this polarized light is sealed. A liquid crystal display device was completed by attaching the polarizing plate 22 to the back plate so that the polarization axis of the plate and the polarization axis were perpendicular to each other. FIG. 2 fbi shows a sectional view of the liquid crystal display device viewed from an oblique direction of the cover plate, and a transparent portion called NEC can be obtained in the opaque portion.

As described above, with the simple method of punching holes in a polarizing plate as in the present invention, it is possible to obtain an easy-to-read model name display, a lot number display, etc. with a large amount of information, and the effects of the present invention are as follows. Very noticeable.

Although the present invention has been described with respect to a transmission type TN display type liquid crystal display device with a positive type display, it is a negative type display.

It is clear that similar effects can be obtained with any liquid crystal display device that uses at least one polarizing plate, regardless of the reflective type.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing a conventional 'I''Nfi display type liquid crystal display device. Figure 2 (a) is a cross-sectional view of an embodiment of the present invention, and Figure 2 fb) is a cross-sectional view of a conventional 'I''Nfi display type liquid crystal display device. A perspective view including a cross section. 1.1', 21.22...Polarizing plates 2, 2
/...Glass substrate with transparent conductive film%313'11
3...Sealing material, 4.14...Liquid crystal material,
5...Incoming light, 11...Ka5-par plate, -12...Dan/backplate. 61

Claims (1)

[Scope of Claims] 1) A cover plate and a pack plate each having a desired transparent electrode pattern on their inner surfaces are placed facing each other at a predetermined interval, the periphery is covered with a layer, liquid crystal is injected inside, and the cover plate is 1. A liquid crystal display device comprising a polarizing plate installed on one or both of the front surface of the back plate and the back surface of the back plate, the liquid crystal display device comprising a perforation provided in a part of the polarizing plate. 2) The liquid crystal display device according to claim 1, wherein the perforations are characters, numbers, or symbols.