KR19990043888A - LCD Formation Method - Google Patents

Abstract

The present invention relates to a method for forming a liquid crystal display device, in which a liquid crystal in which a vertical alignment agent, a horizontal alignment agent, and a photopolymer are mixed is injected into a cell gap of an upper and lower liquid crystal substrate with an alignment layer, and sealed, and the UV light polarized on the liquid crystal It is possible to arbitrarily adjust the pretilt angle by irradiating, and to improve the characteristics and reliability of the device because the effect of the orientation can be increased.

Description

LCD Formation Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a liquid crystal display (hereinafter referred to as LCD), and more particularly, to a technique of orienting a liquid crystal by mixing a vertical alignment agent, a horizontal alignment agent, and a photopolymer into a liquid crystal.

LCD, which is a kind of flat panel display, is a device that changes the optical anisotropy by applying an electric field to a liquid crystal that combines liquidity and optical properties of crystal. Its low volume, small size, large size and high definition make it widely used.

In general LCD, a transparent electrode pattern is formed on a transparent upper and lower substrate, a polyimide alignment layer is coated on the upper and lower substrates of the structure in a predetermined direction, and a rubbing process is used. The alignment layer is oriented.

Then, the two substrates are joined by forming a failure turn on the upper or lower substrate, and the liquid crystal is filled in the cell gap between the upper and lower substrates, and then the phase difference plate and the polarizing plate are attached to the upper and lower substrates, respectively. To complete.

These LCDs are classified into T. Ne (Twisted Nematic), S. T. (Twisted Nematic), Ferroelectric or Correctic LCD according to the type of liquid crystal used. It is widely used because of the advantages of high speed operation and high definition.

However, when the rubbing process is performed using the rubbing tool, static electricity may be generated, a low pretilt angle of 10 degrees or less, and an alignment layer may be damaged.

In order to solve this disadvantage, the liquid crystal is oriented using a photopolymer, but has a disadvantage of having a low pretilt angle of 5 degrees or less, which still does not solve the disadvantage of the end point.

The present invention is to solve the above problems, and to form an LCD using a liquid crystal mixed with a vertical alignment agent, a horizontal alignment agent and a photopolymer to form a liquid crystal display device that can improve the characteristics and reliability of the device The purpose is to provide.

1A and 1B are cross-sectional views showing a liquid crystal liquid crystal display device having vertically and horizontally aligned liquid crystals.

2A and 2B are cross-sectional views illustrating a method of forming a liquid crystal display device according to the present invention;

<Explanation of symbols for main parts of drawing>

11,21: lower liquid crystal substrate 13,23: lower alignment layer

15,25: upper liquid crystal substrate 17,27: upper alignment layer

19,29,33: liquid crystal 37: UV light

LCD forming method according to the present invention for achieving the above object,

Injecting and sealing a liquid crystal mixed with a vertical alignment agent, a horizontal alignment agent, and a photopolymer into the cell gaps of the upper and lower liquid crystal substrates provided with an alignment layer;

And irradiating the polarized UV light to the liquid crystal.

Hereinafter, an LCD forming method according to the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B illustrate a vertical alignment agent between lower liquid crystal substrates 11 and 21 with lower alignment layers 13 and 23 and upper liquid crystal substrates 15 and 25 with upper alignment layers 17 and 27, respectively. And a cross-sectional view of forming the liquid crystals 19 and 29 that are vertically or horizontally aligned due to the horizontal alignment agent.

FIG. 2A is a schematic diagram illustrating a liquid crystal in which a liquid crystal mixed with a vertical alignment agent, a horizontal alignment agent, and a photopolymer are injected into the liquid crystal substrate 31 and sealed in the liquid crystal substrate 31, wherein "↔" indicates a polarization direction. "↑" 37 shows the traveling direction of the UV light.

In this case, when the vertical alignment agent and the horizontal alignment agent are 0: 100, the liquid crystal is horizontally aligned, when 100: 0, the liquid crystal is vertically aligned, and when the 50: 50, the liquid crystal is aligned at 45 °, and the vertical alignment agent and the horizontal alignment agent The pretilt angle is determined according to the mixing degree of. Here, as in the "↑" 37, the photopolymer is irradiated with UV light to give a directivity to the liquid crystal, thereby having an effect such as rubbing.

FIG. 2B is a schematic view showing the pretilt angle of the liquid crystal formed by the process of FIG. 2A, and shows that the pretilt angle can be freely adjusted according to the mixing degree of the vertical alignment agent and the horizontal alignment agent.

As described above, in the LCD forming method according to the present invention, the photopolymer is mixed with a liquid crystal in which the vertical alignment agent and the horizontal alignment agent are mixed at an appropriate ratio, thereby controlling the pretilt angle and having the effect of alignment. There is an effect to improve the characteristics and reliability of the.

Claims (2)

Injecting and sealing a liquid crystal mixed with a vertical alignment agent, a horizontal alignment agent, and a photopolymer into the cell gaps of the upper and lower liquid crystal substrates provided with an alignment layer; And a process of irradiating the polarized UV light to the liquid crystal. The method of claim 1, And said liquid crystal display device has a pretilt angle of 0 to 90 degrees.