JPH0685033B2 - Liquid crystal display - Google Patents

Description

TECHNICAL FIELD The present invention relates to a guest-host type liquid crystal display device, and more particularly to a liquid crystal display device having a semi-colored region on a part of a display surface.

(Prior Art) In a guest-host type liquid crystal display device, for example, as shown in FIG. 5, liquid crystal molecules 3 and dichroic dye 4 are uniaxially aligned in a cell formed by two glass substrates 1 and 2. , Liquid crystal molecule 3
The arrangement is controlled by applying or not applying voltage, and the arrangement of the dichroic dye 4 is also controlled at the same time to perform color display.

Using this type of liquid crystal display device, as shown in FIG. 5, a non-colored region 6a which becomes non-colored when a voltage is applied or not applied is formed on a part of the display surface 6 as shown in FIG. A portion 5a having a polarization direction b ₁ parallel to the dichroic dye 4 and having no polarization direction in the polarizing plate 5 to be combined with the cell.
Are provided corresponding to the uncolored area 6a in FIG.

However, in order to form the polarizing plate 5 having the region 5a that does not have a polarization direction in any of the directions as described above, a complicated process is required and the cost becomes high. Further, it is difficult to align the polarizing plate 5 with the cell. Further, since the portion 5a having no polarization direction in any direction is provided, there is a drawback that the uncolored area 6a on the display surface cannot be changed to a colored area having a different density.

(Object of the Invention) It is an object of the present invention to provide a low-cost guest area that allows a small area on a display surface to be an area having a different coloring density.
An object is to provide a host type liquid crystal display device.

(Summary of the Invention) The present invention provides a guest-host type liquid crystal display device in which a liquid crystal containing a dichroic dye is interposed between two glass substrates each having a pattern electrode on the inner surface thereof. A predetermined small area is set, and the rubbing direction for the orientation processing of this small area is a direction oblique to the rubbing direction of the other surface, while the polarization direction is the rubbing direction of the surface other than the small area. It is characterized in that a polarizing plate is arranged so as to be parallel to, and regions having different coloring densities are formed on a part of the display surface.

(Embodiment) FIG. 1 shows an embodiment of the present invention, in which 11 and 12 are glass substrates having a pattern electrode on the inner surface thereof, and 13 is a polarizing plate. Both the substrates 11 and 12 are arranged so as to face each other, and a sealing agent is interposed in the peripheral portion to form a cell. A liquid crystal containing a dichroic dye is enclosed inside the cell. The inner surfaces of both substrates 11 and 12 are subjected to orientation treatment. In the case of substrate 12, the direction of arrow a ₁ is determined in a predetermined small area 12a, and the direction of arrow a ₂ is determined in the other surface (display main surface). The rubbing direction is set. That is, on the display main surface, it becomes orthogonal (or parallel) to the side of the cell, and the small area
In 12a a direction oblique to the arrow a _2. And the polarizing plate 1
3 is the polarization direction in the direction of arrow b ₂ (direction parallel to the rubbing direction of the display main surface).

The rubbing direction of the other substrate 11 may be any direction. Further, in order to have different rubbing directions like the orientation treatment of the substrate 12, first, the entire surface of the substrate is rubbed in the direction of the arrow a ₂ and then a rubbing mark with holes only in the small region 12a is formed. A method such as rubbing in the direction of arrow a ₁ is used.

With the above structure, the liquid crystal molecules follow the directions of the arrows a ₁ and a _{2 on} the inner surface of the substrate 12, and accordingly, the dye also follows the directions. As a result, when no voltage is applied, the substrate
The light passing through the portion other than the small region 12a of 12 is colored with a predetermined color, and the density of the light passing through the small region 12a is reduced. That is, as shown in FIG. 2, the display main surface of the display surface 20 is displayed with a predetermined color and density, and the portion 20a corresponding to the small area 12a is displayed with a density different from the main surface density.

On the other hand, when a voltage is applied, the arrangement of liquid crystal molecules changes, and the arrangement of dyes changes accordingly. As a result, light absorption does not occur on the display main surface, and only the portion 20a corresponding to the small region 12a becomes semi-colored.

Figure 3 is a plurality of the substrate 12, for example two small regions 12a, a case of forming the 12b, the rubbing direction of the small region 12a, 12b has a different direction as the arrow a _1, a _3.

By doing so, two semi-colored regions 20a, 20b are formed on the display surface 20 as shown in FIG. In that case, the density of semi-coloring differs depending on the rubbing direction.

(Effect) As described above, according to the present invention, a small area having a density different from that of the display main surface is formed by the alignment treatment on the cell itself, so that complicated processing on the polarizing plate is unnecessary and cost reduction can be achieved. Can be achieved. Further, since the cell itself is subjected to the alignment treatment to form the small region, the polarizing plates are generally bonded to each other, and the alignment accuracy is improved. Furthermore, since the coloring density is controlled by changing the orientation direction of the small area, it is possible to easily create a semi-colored area that was impossible with the conventional structure.
The degree of coloring can be variously changed by setting the orientation direction. Moreover, it is easy to create a plurality of small areas.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a liquid crystal display device according to the present invention, FIG. 2 is an explanatory view of a display surface of the same embodiment, and FIGS. 3 and 4 are perspective views showing other embodiments. Explanatory drawing of display surface, No. 5
FIG. 6 and FIG. 6 are a perspective view and a display surface explanatory view showing a conventional example. 11 and 12 ...... glass substrate, a small area for 12a and 12b ...... half color display, 13 ...... polarizing plate, 20 ...... display surface, 20a ...... half colored region, a ₁ ~a ₃ ...... rubbing direction , B ₂ …… Polarization direction.

Claims (1)

[Claims] 1. A guest comprising a liquid crystal containing a dichroic dye interposed between two glass substrates having pattern electrodes on the inner surface.
In a host-type liquid crystal display device, a predetermined small area is set on the inner surface of one substrate, and the rubbing direction for alignment processing of this small area is set to be a direction oblique to the rubbing direction of the other surface. On the other hand, a liquid crystal display characterized in that a polarizing plate is arranged so that the polarization direction is parallel to the rubbing direction of the surface other than the small area, and areas having different coloring densities are formed on a part of the display surface. apparatus.