JPS6261025A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the position accuracy in a noncolored area by applying the orientation processing to the inner surface of one substrate so that the rubbing direction in the prescribed small area orthogonally intersects with those on any surfaces other than said area and disposing a polarization plate so that the polarization direction can orthogonally intersects with the rubbing direction in the prescribed small area. CONSTITUTION:Substrates 11 and 12 are arranged so as to face each other, and in their vicinities a sealing agent is interposed, whereby said substrates are made into a cell. A liquid crystal including bicolor element is sealed in the cell. The orientation processing is applied to the inner surfaces of both substrates 11 and 12. In the substrate 12 the rubbing direction in the prescribed small area 12a and those on any surfaces other than the small area 12a are set to the direction of an arrow a1 and that of an arrow 2a orthogonally intersecting with the arrow a1, respectively. The polarization plate 13 takes the direction of an arrow b2 for the polarization direction. On the inner surface of the substrate 12 a liquid crystal molecule follows directions of arrows a1 and a2, and accordingly the color element also follows said direction. In terms of a display surface 20, areas other than the noncolored area 20a corresponding to the small area 12a display in colors. On the other hand, the array mode of molecules is changed in impressing a voltage, and accordingly light absorption will not arise, and the entire display surface 20 becomes noncolored.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a guest-host type liquid crystal display device, and particularly to a liquid crystal display device having a non-colored area on a part of the display surface.

(Prior Art) A guest-host type liquid crystal display element has liquid crystal molecules 3 and a dichroic dye 4 uniaxially aligned in a cell formed of two glass substrates 1.2, as shown in FIG. 3, for example. By controlling the alignment of the liquid crystal molecules 3 by applying or not applying a voltage, the alignment of the dichroic dye 4 is also controlled at the same time, so that color display is performed.

Using this type of liquid crystal display element, in order to create a non-colored region 6a on a part of the display surface 6 as shown in FIG. 4, which remains uncolored both when voltage is applied and when no voltage is applied, as shown in FIG. As shown in FIG. 4, a polarizing plate 5 having a polarization direction parallel to the dichroic dye 4 and having no polarization direction in any direction is provided corresponding to the uncolored area 6a in FIG. ing.

However, forming the polarizing plate 5 which partially has the region 5a having no polarization direction in any direction requires complicated steps, resulting in high cost. Another drawback is that alignment is difficult when attaching the polarizing plate 5 to 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 area can be set on a part of the display surface with high positional accuracy and which 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 patterned electrode on the inner surface. An alignment treatment is performed so that the two pinning directions of a predetermined small area and other surfaces are perpendicular to each other, and a polarizing plate is arranged so that the polarization direction is perpendicular to the rubbing direction of the predetermined small area. It is characterized by creating an uncolored area in a part of the area.

(Example) Figure 1 shows an example of the present invention.
1 is a glass substrate having a semi-turn electrode on its inner surface, and 13 is a polarizing plate. The two difference plates H,' 12 are arranged to face each other,
A sealing agent is interposed at the periphery of the cell to form a cell. A liquid crystal containing a dichroic dye is sealed inside the cell. The inner surfaces of the two difference plates 11 and 12 are subjected to orientation treatment, but in the case of the substrate 2, the direction of the arrow a1 in the predetermined small area 12a,
On other surfaces, the direction of arrow a2 perpendicular to arrow a1 is taken as the rubbing direction.

The polarizing plate 13 has a direction of arrow b2 (a direction perpendicular to the rubbing direction aI of the small region 12a) as a polarization direction.

Note that the rubbing direction of the other substrate 11 may be any direction. In addition, in order to have two mutually orthogonal rubbing directions as in the orientation treatment of the substrate 12, first the entire surface of the substrate is rubbed in the direction of arrow a, and then holes are formed only in the region 12a. A method of rubbing in the direction of arrow a1 using a rubbing mask is used.

With the above structure, the liquid crystal molecules follow the directions of arrows aI and a2 on the inner surface of the substrate 12, and thus the dye also follows the directions. As a result, when no voltage is applied, only the light passing through parts other than the small area 12a of the substrate 12 is colored, and as shown in FIG. Become.

On the other hand, when voltage is applied, the arrangement of liquid crystal molecules changes, and the arrangement of the dye changes accordingly. As a result, no light absorption occurs and the entire display surface becomes uncolored.

(Effects) As described above, according to the present invention, since an uncolored region is always created by the alignment treatment on the cell itself, complicated processing on the polarizing plate is unnecessary, and costs can be reduced. Further, if a rubbing mask is used, alignment is easy and the positional accuracy of the non-colored area can be improved.

[Brief explanation of the drawing]

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 the display surface of the same embodiment, and FIGS. 3 and 4 are a perspective view and display surface of a conventional example. It is an explanatory diagram. 11 and 12...Glass substrate, 12a...
...Predetermined small area, 13...Bolarization plate, al and a2...Rubbing direction, b2...Polarization direction, Addition...Display surface, 20a・・・・・・
...Uncolored area. Figure 1 Figure 2

Claims (1)

[Claims] In a guest-host type liquid crystal display device in which a liquid crystal containing a dichroic dye is interposed between two glass substrates having patterned electrodes on the inner surface, a predetermined small area is formed on the inner surface of one substrate and the other surface is An alignment treatment is performed so that the rubbing direction of the predetermined small area is perpendicular to the rubbing direction, and a polarizing plate is arranged so that the polarization direction is perpendicular to the rubbing direction of the predetermined small area, thereby creating an uncolored area in a part of the display surface. A liquid crystal display device characterized by: