KR0172267B1 - Spacer scattering method for lcd - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dispersing a spacer of a liquid crystal display device, and more particularly, to a method for dispersing a spacer of a liquid crystal display device capable of realizing high image quality by dispersing a spacer when the upper and lower plates are attached using an electric field. In the present invention, a thin film transistor and a pixel electrode are formed on a lower substrate, and a color filter is formed on an upper substrate to be bonded to the lower substrate. Subsequently, upon attachment of the upper substrate to the lower substrate, in order to maintain a certain distance, the liquid crystal display in which the negatively charged spacers are scattered on the lower substrate and then the negative ions charged to the spacers by X-ray beam irradiation are removed. In the method of dispersing spacers of a device, a positive voltage is applied only to a portion where a spacer is desired to be distributed to a lower substrate, and grounded to other portions to spread the spacer.

Description

Spacer spreading method of liquid crystal display device

1 (a) is a cross-sectional view of a liquid crystal display device in which a spacer is interposed between upper and lower substrates of a conventional liquid crystal display device.

(b) is a figure for demonstrating the dry spacer spreading method among the spacer spreading methods of the conventional liquid crystal display element.

(c) is sectional drawing of the liquid crystal display element in which the spacer was spread | dispersed in the conventional dry spacer spreading method.

(d) is a plan view of a liquid crystal display device in which a spacer is dispersed according to a conventional dry spacer spreading method.

FIG. 2 (a) is an equivalent circuit diagram schematically shown for explaining a spacer scattering method of a liquid crystal display device according to the present invention.

(b) is a plan view of a liquid crystal display device in which spacers are scattered in accordance with a method for dispersing a spacer of the liquid crystal display device of the present invention.

* Explanation of symbols for main parts of the drawings

1: upper substrate 2: lower substrate

3: spacer 4: liquid crystal

5: real 10: tungsten electrode

11: counter electrode 12: gate electrode wiring

13 data electrode wiring 14 thin film transistor

15: pixel electrode

Technical Field of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dispersing a spacer of a liquid crystal display device, and more particularly, to a method for dispersing a spacer of a liquid crystal display device capable of realizing high image quality by dispersing a spacer when the upper and lower plates are attached using an electric field.

[Private Technology]

Current liquid crystal display devices constitute display elements such as televisions and graphic displays. In particular, active matrix type liquid crystal display devices have high-speed response characteristics and are suitable for high pixel counts, thereby increasing the quality of display screens, increasing the size, and color screens. It greatly contributes to the realization.

The liquid crystal display device is formed by bonding a lower substrate composed of a thin film transistor and a pixel electrode and an upper substrate, which is a color filter substrate, with a liquid crystal interposed therebetween. However, when the liquid crystal is filled between the upper substrate and the lower substrate, there is a problem that it is difficult to secure a constant interval, and as shown in FIG. 1 (a), conventionally, the upper substrate 1 and the lower substrate 2 Spherical micromaterials called spacers 3 for maintaining a constant gap therebetween were scattered. In the figure, reference numeral 4, which is not described, denotes a liquid crystal, and 5 denotes a seal material.

Conventional spacer dispersing methods include a wet spacer dispersing method and a dry spacer dispersing method. First, a wet spacer dispersing method is mixed between a lower substrate and an upper substrate after mixing the spacers with CFCs or solvents.

In addition, the dry spray method generates a high negative voltage at the tungsten electrode 10 at the end of the special nozzle, as shown in FIG. 1 (b), so that the air in the surroundings is in a colon or charge state. Ionized. Then, the spacers 3 carried by the air collide with the anions in the air, the spacers 3 are negatively ionized, and the anionized spacer 3 molecules repel each other and face toward the rounded stage. Subsequently, the negatively ionized spacers on the glass, which are the insulators placed on the stage, are applied to the lower substrate 2 (first (d) degrees) while being uniformly spaced by the repulsive force from each other (first (d) degrees) and the X-rays in the 90 degree direction. Anion charged to the spacer 3 is removed by beam irradiation.

[Technical problem to be achieved]

However, the conventional wet and dry dispersion methods have the following problems.

First, since the conventional wet dispersion method is a substance causing serious environmental problems such as the destruction of the ozone layer by the CFCs used in the wet dispersion, the use of CFCs has recently been regulated, and accordingly, spacers are applied to other ultrapure water or solvents. There is a problem in that such an effect does not appear when mixed and distributed.

In addition, the conventional dry scattering method has the advantage that the spacers are uniformly applied without being agglomerated with each other, but because the spacers 3 are evenly distributed over the entire portion of the glass, the pixel for determining the aperture ratio and the contrast ratio of the liquid crystal display device. The spacers are also scattered on the electrode 15 (see also first (d)). As a result, when the on / off of the liquid crystal display device is turned on, problems such as blocking of transmitted light and light leakage may occur. The aperture ratio was reduced.

Accordingly, the present invention is to solve the above-described conventional problems, the present invention is applied to the gate electrode positive voltage, the spacer is negatively ionized, and then the spacer is not scattered on the pixel electrode so that the liquid crystal display device An object of the present invention is to provide a method for dispersing a spacer of a liquid crystal display device capable of improving the contrast ratio and the aperture ratio of a liquid crystal display device by resolving transmitted light, blocking light leakage, and the like.

[Configuration and Function of Invention]

In order to achieve the above object of the present invention, the present invention forms a thin film transistor and a pixel electrode on the lower substrate, and a color filter formed on the upper substrate to be bonded to the lower substrate, and then on the lower substrate, In the method of dispersing a spacer of a liquid crystal display device in which a negatively charged spacer is scattered on a lower substrate, and then an anion charged on the spacer is removed by X-ray beam irradiation, in order to maintain a certain distance when the upper substrate is attached. The positive voltage may be applied only to a portion of the lower substrate where the spacer is to be distributed.

According to this invention, the contrast ratio and aperture ratio of a liquid crystal display element can be improved.

EXAMPLE

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 2 (a) is an equivalent circuit diagram schematically illustrating a spacer spreading method of a liquid crystal display according to the present invention, and (b) shows a spacer scattering according to the spacer spreading method of the liquid crystal display according to the present invention. It is a top view of the liquid crystal display element.

First, as shown in FIG. 2A, the gate electrode wiring 12 is disposed so as not to scatter a spacer interposed on the upper portion of the pixel electrode in order to maintain a predetermined gap when the upper substrate and the lower substrate of the liquid crystal display are attached. A positive voltage is applied to the spacers, and the spacers 3 which are negatively ionized by grounding the data electrode 13 wiring and the pixel electrode 15 at the equipotential are only scattered on the upper portion of the gate electrode wiring by electrostatic attraction.

In more detail, a positive voltage is applied to the gate electrode wiring 12 through the power supply in the gate electrode wiring. In this case, in the case of the plurality of gate electrode wirings 12, a power is applied by being coupled by a shorting bar (not shown). Similarly, the data electrode wiring 13 and the pixel electrode 15 are grounded.

Subsequently, a lower substrate on which the gate electrode wiring 12 and the data electrode wiring 13 are bound by a shorting bar (not shown) is mounted on the stage 11 of the spacer spreader. Subsequently, a positive voltage is applied to the gate electrode wiring 12 of the lower substrate, preferably an appropriate voltage such that the thin film transistor 14 of the lower substrate is turned on, and the data electrode wiring 13 and the pixel electrode 15 Become ground. Then a high negative voltage is generated at the tungsten electrode at the end of the special nozzle to cause the air around it to ionize in the colonna-charged state, and the spacer carried through the nozzle by the air collides with the negative ions in the air, The spacer is anionized. These anionized spacer 3 molecules repel each other, are scattered toward the stage (not shown), and the gate electrode wiring 12 and the data electrode wiring 13 of the lower substrate are placed on the stage (not shown). And an electric field is formed between the gate electrode wiring 12 and the anionized spacer 3, which are relatively positive, by the potential difference with the pixel electrode 15 portion. Then, the spacers 3 scattered due to the attraction between each other act only on the gate electrode wirings 12 or compared with the number of spacers 3 scattered on the data electrode wirings 13 and the pixel electrodes 15. The scattering density on the upper part of the wiring 12 is scattered to be quite high. A diagram in which spacers are distributed by the above method is shown in FIG. 2 (b).

Thereafter, the negative ions charged to the spacer are removed by irradiating the X-ray beam in the 90 degree direction.

[Effects of the Invention]

As described in detail above, according to the present invention, when the light source emitted from the backlight in the display passes through the pixel electrode by controlling the spacers scattered on the data electrode wiring and the pixel electrode so that most of them are positioned on the gate electrode wiring. It is possible to prevent light blocking and light leakage due to the spacer and to realize a high quality liquid crystal display device. Thereby, the liquid crystal display element excellent in contrast ratio and aperture ratio can be manufactured.

Claims (2)

In order to form a thin film transistor and a pixel electrode on the lower substrate, and to form a color filter on the upper substrate to be bonded to the lower substrate, and then to maintain a certain distance on the lower substrate, when attached to the upper substrate, A method of dispersing a negatively charged spacer on a lower substrate and then removing anions charged on the spacer by X-ray beam irradiation, the method of dispersing a spacer in a liquid crystal display device, wherein the amount of the spacer is scattered on the lower substrate. A method of dispersing a spacer of a liquid crystal display device, characterized by applying a voltage. 2. The method of claim 1, wherein the positive voltage is applied to the gate electrode wiring of the lower substrate, and the data electrode wiring and the pixel electrode of the lower substrate are grounded.