JPH0685034B2 - 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 non-colored region on a part of its display surface.

(Prior Art) In a guest-host type liquid crystal display device, for example, as shown in FIG. 3, 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. 3, 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 region 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, there is a drawback that it is difficult to align the polarizing plate 5 with the cell.

(Object of the Invention) An object of the present invention is to provide a guest-host type liquid crystal display device in which a non-colored region can be set in a part of the display surface with high positional accuracy and can be manufactured at low cost.

(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. While subjecting the alignment treatment so that the rubbing directions of the predetermined small region and the other surface are orthogonal to each other, a polarizing plate is disposed so that the polarization direction is orthogonal to the rubbing direction of the predetermined small region, and The feature is that a non-colored region is formed in a part.

(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. Both substrates 11 and 12 are subjected to orientation treatment on their inner surfaces, but in the case of substrate 12, the direction of arrow a ₁ in a predetermined small region 12a, the direction of arrow a ₂ orthogonal to arrow a _{1 in the} other surface. Is the rubbing direction. The polarizing plate 13 has a polarization direction in the direction of arrow b ₂ (direction orthogonal to the rubbing direction a ₁ of the small area 12a).

The rubbing direction of the other substrate 11 may be any direction. In addition, as in the alignment treatment of the substrate 12, the two are orthogonal to each other.
In order to have a certain rubbing direction, first the entire surface of the substrate is rubbed in the direction of arrow a ₂ and then the rubbing mask with holes only in the area 12a is rubbed in the direction of arrow a _1. To use.

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
Only the light passing through the parts other than the 12 small regions 12a is colored,
As shown in FIG. 2, the display surface 20 is colored in the area other than the uncolored area 20a corresponding to the small area 12a.

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 and the entire display surface 20 is not colored.

(Effects) As described above, according to the present invention, since the region of the colored state is always formed by the alignment treatment on the cell itself, complicated processing on the polarizing plate is unnecessary, and the cost can be reduced. Moreover, if a rubbing mask is used, the alignment can be easily performed, and the positional accuracy of the uncolored region can be improved.

[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 embodiment, and FIGS. 3 and 4 are perspective views and display surfaces showing a conventional example. FIG. 11 and 12 ...... glass substrate, 12a ...... predetermined small area, 13 ...... deflectors, a ₁ and a ₂ ...... rubbing direction, b ₂ ...... polarization direction, 20 ...... display surface, 20a ...... uncolored region.

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, an alignment process is performed on the inner surface of one substrate so that the rubbing directions of a predetermined small area and the other surface are orthogonal to each other, while the polarization direction is orthogonal to the rubbing direction of the predetermined small area. Arrange the polarizing plate to
A liquid crystal display device characterized in that a non-colored region is formed on a part of the display surface.