JPH05890Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a liquid crystal display element having a negative display area and a positive display area on the display surface of one liquid crystal cell.

[Prior Art] As a liquid crystal display element of this type, there is one in which a polarizing plate on one side of a TN array cell is divided into two parts and pasted so that the polarization directions are perpendicular to each other depending on the area. In this case, the portion where the polarizing plate is cut and pasted parallel to the polarization direction of the polarizing plate on the other side becomes a negative display area, and the remaining portion becomes a positive display area.

However, with this kind of structure, the positioning accuracy decreases because the polarizing plates are cut and pasted.
The seams between the polarizing plates are noticeable. Moreover, if there is a gap, problems such as leakage of light will occur. Also,
When viewed from an angle, there is a shift due to parallax (approximately 1 mm when viewed at a 45° angle), so the display pattern must be removed from the seam by the amount of this shift, which limits the pattern position.

[Purpose of the invention] An object of the invention is to provide a liquid crystal display element in which a negative portion and a positive portion can be divided with high positional accuracy and the boundary between the negative portion and the positive portion is clearly defined.

[Summary of the invention] The invention consists of one glass substrate, which has a transparent electrode and an alignment film formed on its inward-facing surface, and which has been subjected to alignment treatment by mask rubbing so that the rubbing directions of the two regions are perpendicular to each other. A transparent electrode and an alignment film are formed on the surface, and the other glass substrate, which has been subjected to an alignment treatment in a rubbing direction parallel to one of the rubbing directions, is placed opposite to it at a minute interval, and its peripheral edge is adhered with a sealant. A liquid crystal added with a dichroic dye and a chiral agent was injected into the cell, and the glass substrate side was subjected to alignment treatment by mask rubbing.A polarizing plate was placed on the entire surface of the glass substrate side, so that the polarization direction was the same as the rubbing direction of the TN alignment area. On the other glass substrate side, a polarizing plate is attached to the TN array area so that the polarization direction is perpendicular to the rubbing direction on the inner surface. Positive type display, negative type display in other areas.

[Example] Figures 1 and 2 show an example of the present invention, in which glass substrates 1A, 1B have transparent electrodes 2A, 2B and alignment films 3A, 3B formed on their inward surfaces, and Necessary orientation treatment has been applied. In this case, the entire surface of one substrate 1A is first rubbed in the direction of arrow a1, then area A is covered with a mask and the remaining area B is rubbed in the direction of arrow a2. Further, the entire surface of the other substrate 1B is rubbed in the direction of arrow a3 (direction parallel to the rubbing direction a2 of the area B).

Two substrates 1 subjected to orientation treatment in this way
A and 1B are opposed to each other with a minute interval and their peripheral edges are adhered with a sealant 4 to form a cell, and a liquid crystal 5 to which a dichroic dye and a chiral agent are added is injected into the cell.

A polarizing plate 6A is attached to the outer surface of the substrate 1A of this cell so that the polarization direction is in the direction of arrow b1, and a polarizing plate 6B is attached to the outer surface of the substrate 1B so that the polarization direction is in the direction of arrow b2. . In this case, the entire surface is on the board 1A side, and the TN array area A is on the board 1B side.
Paste the polarizing plate on the part.

With this structure, in area A,
The linearly polarized light that entered the cell through the polarizing plate 1A is
Absorption axis of dichroic dye (parallel to rubbing direction a1)
Because it is perpendicular to the
The light is rotated by 90° and transmitted through the polarizing plate 6B.

When an electric field is applied, the optical rotation of the liquid crystal 5 disappears, and the light passing through the polarizing plate 6A is blocked by the polarizing plate 6B.
That is, the display is performed in positive form.

On the other hand, in region B, the linearly polarized light incident on the screen through the polarizing plate 6A is absorbed by the dichroic dye, and the display surface becomes dark.

When an electric field is applied, the molecular axis of the liquid crystal 5 becomes parallel to the direction of the electric field, that is, perpendicular to the surfaces of the substrates 1A and 1B, and light absorption by the dye disappears, and light passes through the cell. In other words, it is displayed in negative form.

[Effects] As described above, according to the present invention, since the negative part and the positive part are separated by mask rubbing, the positional accuracy is high, the boundary is clear, and there is no gap at all. In addition, since there is no shift due to parallax, the display pattern can be displayed with mask alignment accuracy (100 μm).
m or less). Furthermore, since the polarizing plate does not need to be cut and pasted and is made into one sheet, it is easy to paste.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a liquid crystal display element according to the present invention, and FIG. 2 is a diagram for explaining the rubbing direction and the polarization direction of the polarizing plate during alignment processing in the same embodiment. 1A and 1B...Glass substrate, 4...Sealant, 5...Liquid crystal, 6A and 6B...Polarizing plate, a1
~a3...Rubbing direction, b1 and b2...Polarization direction.

Claims (1)

[Scope of utility model registration request] A transparent electrode and an alignment film are formed on the inward facing surface, and one glass substrate is subjected to an alignment treatment by mask rubbing so that the rubbing directions of the two regions are orthogonal, and a transparent electrode and an alignment film are formed on the inward facing surface. death,
Further, the other glass substrate, which has been subjected to alignment treatment in a rubbing direction parallel to one of the rubbing directions, is placed opposite to each other at a very small distance, and the periphery of the glass substrate is adhered with a sealant to form a cell, and a dichroic dye is placed in this cell. A polarizing plate is attached to the entire surface of the glass substrate in which liquid crystal added with a chiral agent is injected and subjected to alignment treatment by mask rubbing so that the direction of polarization is perpendicular to the rubbing direction of the TN alignment region, and the other glass substrate is A liquid crystal display element characterized in that a polarizing plate is attached to the TN array area on the side so that the polarization direction is perpendicular to the rubbing direction on the inner surface.