JPH055884A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To decrease the display defects near a sealing port by orienting the liquid crystal device compsn. to be packed even in the injection port part and averting the mingling of the liquid crystal with a sealing material at the time of production. CONSTITUTION:Two sheets of substrates 11, 12 which have at least liquid crystal oriented films on the surfaces and are so disposed as to allow the liquid crystal oriented film surfaces to face each other are sealed by providing the sealing material 13 around the substrates in such a manner that the sealing material does not overlap on the liquid crystal oriented films. The liquid crystal compsn. injection port 15 is formed by opening a part of the sealing material 13 and the liquid crystal compsn. is injected from this part and is sealed by the sealing material consisting of the cured material of org. matter. The liquid crystal oriented films extend from the inner side to the liquid crystal compsn. injection port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device,
In particular, the present invention relates to a liquid crystal display device having an improved structure of a liquid crystal inlet.

[0002]

2. Description of the Related Art A liquid crystal display element generally used at present has a structure in which a liquid crystal is sandwiched between two glass substrates having electrodes.

To manufacture such a liquid crystal display device,
As shown in FIG. 2, two transparent substrates 21, such as glass,
In order to orient the liquid crystal composition on 22, the orientation film 23 such as polyimide or polyvinyl alcohol is applied and baked by a technique such as printing. At this time, the alignment film is applied so as not to overlap the sealing material 24 described later. afterwards,
A rubbing process is performed, and in order to bond the two glass substrates together, a sealing material 24 such as epoxy is applied to the periphery of the glass substrates (more precisely, the periphery of the alignment film). At the time of application, an opening 25 for enclosing the liquid crystal composition is formed. The aforementioned alignment film is not applied near the opening of the liquid crystal display element.

The two glass substrates thus laminated are degassed in a vacuum, the seal opening is dipped in the liquid crystal composition, and the pressure is returned to atmospheric pressure to seal the liquid crystal composition.
After the liquid crystal composition is sealed, a sealant such as an ultraviolet curing agent or a thermosetting agent is applied to the seal opening, and the liquid crystal sealing is completed. After that, attach a polarizing plate to the screen of two glass substrates,
A drive IC or the like is connected to the board terminal to form a connection module.

[0005]

When the liquid crystal display device thus prepared is driven, there is a defect that the display of the portion filled with the liquid crystal composition becomes a color different from that of the other display portions.
For example, normally white display (N white display when voltage is applied in 90 'twist TN mode, white display when no voltage is applied).
In W), when the liquid crystal display element is driven, a portion that is originally black display is whitish. Further, in normally black (NB) which displays white when a voltage is applied and displays black when no voltage is applied, when a liquid crystal display element is driven, a portion which is originally a white display becomes a blackish display.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a liquid crystal display device which reduces display defects near the liquid crystal composition injection port, has a high yield, and is therefore inexpensive.

[0007]

According to the present invention, there are provided two substrates, each having at least a liquid crystal alignment film on the surface thereof and arranged so that the liquid crystal alignment film surfaces face each other, and the liquid crystal in the peripheral portion of the substrate. A sealing material disposed in a portion without an alignment film to seal the substrate, a liquid crystal composition injection port formed by opening a part of the sealing material, and a liquid crystal composition sandwiched between the substrates. A liquid crystal display element comprising an organic sealant for sealing the injection port, wherein the liquid crystal alignment film extends in the injection port.

[0008]

The liquid crystal display device has a defect mode in liquid crystal encapsulation in the manufacturing process, and when the liquid crystal display device is driven, the liquid crystal composition in which the liquid crystal composition is encapsulated is displayed in a different color from other display parts. Occurs. This is because the liquid crystal composition and the sealant are mixed.

With respect to the poor image quality due to this cause, the present invention is characterized in that a liquid crystal alignment film is provided not only in the display portion but also in the opening portion of the liquid crystal composition injection port, and the liquid crystal composition and the sealant are mixed. It prevents them from fitting. That is,
By installing the alignment film in the opening of the liquid crystal composition injection port, the liquid crystal composition is regularly aligned by the alignment (rubbing) treatment of the alignment film, so that the organic UV curing agent or thermosetting agent of the injection port is sealed. Make it difficult to mix with the inhibitor.

[0010]

EXAMPLE An example of a liquid crystal display device according to the present invention will be described below with reference to FIG.

Example 1 FIG. 1 (a) shows the appearance of the liquid crystal display device of the present invention, FIG. 1 (b) is an enlarged view of the vicinity of the injection port of the liquid crystal display device of the present invention, and FIG. It is the sectional view. The figure shows a dot matrix liquid crystal display element 10 of simple matrix drive, which has a Y substrate, that is, a lower substrate 11 having Y electrodes 11a patterned in a lateral (Y) direction in a strip shape.
And an X electrode 1 patterned in a strip shape in the vertical (X) direction
X substrate having 2a, that is, the upper substrate 12.
A polyimide liquid crystal alignment film 14 is formed on the surface on which each electrode is placed so as not to overlap with the epoxy sealing material 13 except for the periphery to be sealed and bonded, and after alignment treatment by a rubbing method or the like, the Y electrode is formed. And the X electrodes are arranged so that the surfaces on the alignment film side face each other so that the X electrodes are substantially orthogonal to each other. The periphery is sealed with a sealing material 13 to form a cell, and the liquid crystal composition is filled and sandwiched between these substrates to form the liquid crystal display element 10.

A part without a sealing material is formed around a part of the substrate, and this part is used as a liquid crystal injection port 15, and a liquid crystal composition, for example, TN type liquid crystal is injected from this injection port. For injection, a conventional vacuum injection is used. After the injection, the liquid crystal injection port 15 is sealed with an ultraviolet curable material or a thermosetting material. As a liquid crystal composition,
In addition to the TN type, ST type, GH type, or in some cases ECB type or ferroelectric liquid crystal may be used.

In this embodiment, as shown in FIGS. 1B and 1C, the liquid crystal alignment film 14 is provided with an extension 14a so that the liquid crystal injection hole 15 reaches the substrate end 16 at the opening. is doing.

UV-1000 (manufactured by Sony Chemicals Co., Ltd.) was used as a sealant for the liquid crystal injection port 15 and was irradiated with ultraviolet rays for 15 minutes to be solidified to prepare a liquid crystal display element. When this liquid crystal display device was driven, the entire display area could be displayed uniformly. That is, by installing the extended portion 14a of the alignment film in the opening of the liquid crystal composition injection port, the liquid crystal composition is regularly aligned by the alignment film up to the opening. It is difficult to mix with the encapsulant and prevents the deterioration of liquid crystal performance near the encapsulation port.

(Example 2) In Example 1, when the width of the liquid crystal injection port 15 is 20 mm and the gap width is 6 μm, the extension 14a of the liquid crystal alignment film 14 is 2 m from the inside to the substrate end.
The liquid crystal display device was prepared by extending the film to the position m, filling the liquid crystal composition, and using 3051 (manufactured by ThreeBond Co., Ltd.) as an encapsulant, irradiating ultraviolet rays for 15 minutes to solidify. When this liquid crystal display device was driven, the entire display area could be displayed uniformly.

(Comparative Example) In Example 2, the alignment film 14 was used.
An extension 14a of the liquid crystal is formed up to a position 5 mm from the substrate end of the liquid crystal injection port, and the liquid crystal composition is filled therein.
(Manufactured by ThreeBond Co., Ltd.) was irradiated with ultraviolet rays for 15 minutes to be solidified to prepare a liquid crystal display element. When this liquid crystal display device was driven, a display abnormality occurred near the inlet.

Although the present invention has been described with reference to the embodiments, it goes without saying that the device may include two substrates provided between two polarizing plates, if necessary. It can also be applied to active matrix drive liquid crystal display elements, for example,
A thin film transistor (TFT) having a semiconductor layer of amorphous silicon (a-Si), a display electrode and a signal electrode connected to the thin film transistor, a TFT array substrate on which a gate electrode is formed, and a counter electrode installed opposite to the TFT array substrate are provided as necessary. R
The same effect can be obtained even with a structure in which the liquid crystal composition is sandwiched between the counter substrate having the GB color filter.

[0018]

EFFECTS OF THE INVENTION According to the present invention, the display defect near the injection port caused by the reaction between the liquid crystal composition and the organic liquid crystal composition encapsulant at the liquid crystal injection port during manufacturing can be reduced, and the yield can be reduced. Can be improved.

[Brief description of drawings]

1A is a plan view showing an appearance of a liquid crystal display device of the present invention, FIG. 1B is a partial view showing an injection port of FIG.
(C) is sectional drawing which cut | disconnected (b) by the AA line and saw in the arrow direction.

FIG. 2A is a partial view showing an enlarged injection port of a conventional liquid crystal display element, and FIG. 2B is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 11 ... Lower substrate 12 ... Upper substrate 13 ... Sealing material 14 ... Liquid crystal alignment film 14a ... Extension part of liquid crystal alignment film 15 ... Injection port

Claims (1)

Claim: What is claimed is: 1. Two substrates, each having at least a liquid crystal alignment film on the surface thereof, arranged so that the liquid crystal alignment film surfaces face each other, and the liquid crystal alignment film in the peripheral portion of the substrate. A sealing material disposed in a non-exposed portion for sealing the substrate, a liquid crystal composition injection port formed by opening a part of the sealing material, a liquid crystal composition sandwiched between the substrates, and A liquid crystal display element comprising a sealant for sealing an inlet, wherein the liquid crystal alignment film extends in the inlet.