JPH06160790A - Liquid crystal spacer spraying device - Google Patents

Abstract

PURPOSE:To electrify spacers without electrifying substrates and to enhance the efficiency of spacer powder spraying by irradiating the spacer powder in the outlet of a spacer transporting system or in the capillary of this spacer transporting system with light to be absorbed by the spacer powder. CONSTITUTION:A specified amt. of the spacer powder 1 is transported by gas from a spacer supplying system 5 and is introduced through the spacer transporting system 6 to a spraying box 4. The spacer powder 1 emitted from the spacer transporting system 6 is electrified by the light 10 emitted from a light source 8 through a fiber 9, by which single particle dispersibility is enhanced and the spacers are sprayed onto the liquid crystal substrate 2 attracted to a stage 3. Plastic beads having 5mum diameter are used as the spacer powder 1, dry air is used as the transporting gas and a high-pressure mercury lamp including UV of the wavelength shorter than 400nm is used as the light source 8. As a result, the spacer powder 1 is electrified but the electrification of the gas is prevented and, therefore, the adverse influence of the static electricity on the liquid crystal substrate 2 is prevented and the single particle dispersibility at the time of spraying to the liquid crystal substrate is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spacer spraying device in a liquid crystal panel manufacturing process.

[0002]

2. Description of the Related Art In a liquid crystal display panel, spacer particles made of silica, alumina, plastic, etc. are sprinkled on the upper and lower substrates and then bonded together in order to maintain a predetermined distance between the upper and lower electrode substrates. There is.

Conventionally, in order to disperse the spacer powder between the liquid crystal substrates, a method of mixing the spacer powder with a volatile solvent such as alcohol and CFC and applying a spinner to the target substrate to evaporate the solvent is carried out. Spacer powder or a mixture of spacer powder and a volatile solvent such as alcohol and chlorofluorocarbon is sprayed with compressed air or nitrogen gas into the space in the spray chamber using a nozzle, and the target substrate is placed on the bottom of the space and sprayed. A method of receiving powder that settles in the chamber. A method in which a spacer main body mixed with a solvent is spray-dispersed and suspended between hollows of a container by a nozzle, and the target substrate is pulled out to the bottom of the container and inserted into the container bottom several times to receive it. The spacer powder is transported using a gas such as nitrogen or air,
A method in which spacer powder is charged and dispersed with a charging gun to enhance monodispersity. There are wet spraying methods such as ..., Dry spraying methods.

[0004]

SUMMARY OF THE INVENTION In the wet spraying method,
Since a solvent is used, it cannot be used depending on the type of liquid crystal panel due to the reaction with the alignment film or liquid crystal material by the solvent. Further, in the conventional dry spraying method, the spacer powder is charged by a charging gun or the like to improve the monodispersity, but the substrate is easily subjected to electrostatic stress. As the display density of a liquid crystal panel increases and the size of the liquid crystal panel increases, the elements are becoming weak against static electricity, and a dry spraying method that does not apply an electrostatic load to the liquid crystal substrate is needed.

[0005]

In a spacer powder sprinkling device for a liquid crystal panel, spacer powder feeding means and spacer carrying means guided to a spreading box are provided, and the spacer carrying means is provided with a light feeding means. Characterize.

[0006]

Function: The spacer powder is charged by gas, and the spacer powder is charged by irradiating the spacer powder with light that tends to disperse the single particles at the outlet of the transfer system or inside the narrow tube of the transfer system. Since it can be prevented, the adverse effect of static electricity on the liquid crystal panel can be prevented.

[0007]

The present invention will be described with reference to the drawings. The first embodiment is shown in FIG. The spacer powder 1 is guided by the spacer supply system 5 by a certain amount of gas to the spray box 4 through the spacer transport system 6. The spacer powder 1 emitted from the spacer transport system 6 is emitted from the light source 8 through the fiber 9
By 0, the spacer powder 1 is charged, the dispersibility of single particles is enhanced, and the spacer powder 1 is dispersed on the liquid crystal substrate 2 adsorbed on the stage 3.

Here, the spacer powder was plastic beads (for example, Micropearl manufactured by Sekisui Fine Chemical Co., Ltd.) having a diameter of 5 μm, the carrier gas was dry air, and the light source was a high pressure mercury lamp containing violet light having a wavelength shorter than 400 nm.

A second embodiment is shown in FIG. The spacer powder 1 flows through the spacer supply system 5 in a constant amount in a gas flow through the spacer transfer system 6 and is irradiated with the light 12 emitted from the light source 11. It is sprayed onto the adsorbed liquid crystal substrate 2. In this case, the spacer conveying system 6 is made of a material which is not easily absorbed by the spacer 1 and which disperses the single particles.

In the experiment, plastic beads having a diameter of 5 μm as the spacer powder, dry air as the carrier gas, a quartz tube and an olefin tube as the spacer carrier system,
As a light source, a high pressure mercury lamp containing purple light having a wavelength shorter than 400 nm was used.

[0011]

In the present invention, the outlet of the spacer conveying system,
Alternatively, by irradiating the light absorbed by the spacer powder inside the narrow tube of the spacer transport system, the substrate is not charged but the spacer powder is charged, and the dispersibility of single particles at the time of spraying on the liquid crystal substrate can be improved. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Spacer Powder 2 Liquid Crystal Substrate 3 Stage 4 Scattering Box 5 Spacer Supply System 6 Spacer Conveying System 7 Exhaust System 8,11 Light Source 9 Fiber 10, 12 Light

Claims (1)

[Claims] 1. A liquid crystal spacer for a liquid crystal panel, comprising a spacer powder supplying means and a spacer carrying means guided to a spreading box, and the spacer carrying means is provided with a light supplying means. Spraying device.