JPS5872985A - liquid crystal display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a TN type liquid crystal display element which allows easy liquid crystal injection and is suitable when a relatively large permanent display is present.

Conventionally, in a TN type liquid crystal display element, in order to form a pattern 11 that is always displayed unchanged regardless of voltage application, the pattern is formed with a sealing material at the corresponding location of the cell, and the structure is such that the liquid crystal is not present at that location. was taken. However, with this structure, for example, if the permanent display is an Arabic numeral zero, the liquid crystal cannot be injected inside the zero after the cell is completed, so the liquid crystal must be prepared before the cell sealing process. The liquid crystal material will adhere to the sealing material (which has not yet gone through the heat curing process at the sealant's root and is somewhat dry, but is still reactive), and there is a risk that the seal may peel off under conditions such as high temperatures. There was a drawback.

An object of the present invention is to provide a TN type liquid crystal display element that does not have the above-mentioned drawbacks and can easily form a relatively large, unchanging display using simple means.

In order to achieve the above object, in the present invention, the alignment direction of the liquid crystal alignment film on the inner surface of the cell face plate is partially set in a direction different from the others only in a portion corresponding to a constant display. N, shape (81)
0) When a liquid crystal is sealed in a cell whose alignment direction is partially changed so that homogeneous alignment regions and twisted alignment regions coexist, and the liquid crystal is sandwiched between polarizing plates, the homogeneous alignment regions will be present regardless of whether a voltage is applied or not. This is an area where constant display is displayed. If the polarization axes of the upper and lower polarizers are perpendicular to each other, a positive display (the display area will be dark) will be obtained, and if they are parallel to each other, a negative display will be obtained (the display area will appear white).

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in Figure 1, the upper face plate UP and the lower face plate L'P of the cell.In the 6 figures of Takarazukuri, 1 is an upper electrode plate (a glass plate with a transparent conductive film electrode for display purposes on the inner surface); 1 is a lower electrode plate, b and b are polarizing plates, C and -C' are alignment films, and d is a liquid crystal to be injected later. The arrows in the figure indicate the alignment direction of the alignment film, specifically, for example, the rubbing direction or the vapor deposition direction of the film material. At the stage shown in this figure, the cell has not yet been formed, the liquid crystal does not actually exist, and the alignment direction of the alignment film C on the lower face plate LP is uniform at all locations (in the case shown in the figure). is paper WiK orthogonal). In FIG. 2, the orientation direction of the alignment film C' of the lower face plate LP is partially different from other parts only in the part corresponding to the unchanged display, and the direction is the same as the orientation direction of the alignment film C of the upper face plate UP (in the case shown). (in the paper plane direction) K state is shown. To achieve this, after processing the alignment direction as shown in Fig. 1, it is sufficient to expose the parts corresponding to the permanent display, apply a mask to cover other parts, and perform rubbing or vapor deposition. Figure 3 shows that after processing as above, a cell is made using the lower face plate, and the liquid crystal d
The homogeneous orientation region and the twisted orientation region coexist (K when no voltage is applied).

As explained above, according to the present invention, constant display can be performed with only a slight increase in the processing steps for the alignment film, and not only positive display but also negative display can be easily performed.

[Brief explanation of drawings]

FIG. 1.2 is an explanatory diagram of the working process of the present invention, and FIG. 3 is a diagram of a state in which no voltage is applied in an embodiment of the present invention. a, a...upper and lower electrode plates, b, b...polarizing plate, c, c...alignment film, d...liquid crystal. Agent Patent Attorney Susuki 1) Toshiyuki

Claims (1)

[Claims] In a TN type liquid crystal display element which has a constant display in addition to the display produced by applying a voltage, the orientation direction of the alignment film is partially different from other parts only in the part corresponding to the unchangeable display. A liquid crystal display element featuring: