JPS6233574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a liquid crystal display panel provided with a gapping agent on its entire surface.

[Conventional technology]

One of the factors that determines the quality of a liquid crystal display panel is the uniformity of the distance between the two glasses that make up the liquid crystal display panel. If the glass spacing is uneven, the following problem occurs. First, it becomes discolored due to light interference, which makes it look dirty. Because the threshold voltages of liquid crystals are different, contrast unevenness occurs. Various margins in liquid crystal panels decrease. LCD response time is different. Because of this problem, the glass spacing must be uniform.

In order to solve the above problem, the method shown in FIG. 1 has been adopted. 1 and 2 are glass substrates,
3 is a spacer, and liquid crystal is injected into a portion 6 surrounded by 1, 2, and 3. 4 and 5 are gapping agents, which make the distance between the glass substrates 1 and 2 uniform. As a gapping agent,
Glass fiber, alumina, etc. are used.

[Problem that the invention seeks to solve]

However, in this method, as shown in FIG. 2, when the upper and lower substrates are warped, the gapping agent 4 in the spacer is in contact with the upper and lower substrates 1 and 2, but the gapping agent 5 in the liquid crystal is , due to the bending of the glass substrate, gaps are created and it does not function as a gapping agent. As a result, the distance between the two glass substrates becomes uneven.

Furthermore, when the inner surface of the glass substrate is not flat due to undulations or irregularities, the gap between the two glass substrates similarly becomes uneven.

The present invention eliminates such drawbacks,
The purpose of this is that even if a glass substrate is used that has deformations such as warpage or undulations on the surface,
The objective is to provide a manufacturing method that can assemble two glass substrates with a uniform spacing.

[Means for solving problems]

The method for manufacturing a liquid crystal display panel according to the present invention includes the steps of: mixing a gapping agent, an organic adhesive, and a volatile organic solvent to form a mixed solution; spraying the mixed solution onto a glass substrate in a heated atmosphere; It is characterized by comprising the step of stacking the glass substrates on top of each other with the surfaces of the glass substrates sprayed with the mixed solution facing inside, and bonding the glass substrates together using the organic adhesive formed around the gapping agent. shall be.

〔Example〕

FIG. 3 shows a cross-sectional view showing the structure of a liquid crystal display panel obtained by the present invention.

1 and 2 are glass substrates, 3 is a spacer, and liquid crystal is injected into a space 6 formed by the glass substrates 1, 2 and the spacer 3. 4,5
is a gapping agent. An adhesive 7 is formed around the gapping agent 5 by the method described below, and this adhesive 7 fixes the glass substrates 1 and 2.

First, a gapping agent, an adhesive, and a volatile organic solvent are mixed to form a mixed solution. Gap agents include alumina, glass fiber powder, etc.
The adhesive used is an epoxy resin that does not react with the liquid crystal and degrade the liquid crystal. The organic solvent used is one that easily evaporates, such as Daiflon (organic solvent manufactured by Daikin Industries, Ltd.) and acetone. Since the volatile organic solvent has excellent wettability to alumina and glass fiber powder, it disperses the gapping agent 5 well in the mixed solution and at the same time dissolves the adhesive of the epoxy resin, which is an organic material.

Next, this mixed solution is sprayed onto one or both glass substrates in a heated atmosphere. As mentioned above, in the mixed solution, the gapping agent 5 is dispersed and the adhesive 7 is dissolved in the volatile organic solvent, so when it is sprayed in a heated atmosphere, the volatile organic solvent instantly vaporizes. At that time, the adhesive flies in a condensed state around the gapping agent 5 as a nucleus, reaches the surface of the glass substrate 2, and is attached by the adhesive force of the adhesive.

Further, a spacer 7 containing a gapping agent 4 therein is formed around the glass substrate in another step.

In this way, by overlapping and bonding the glass substrates 1 around which the adhesive 7 is adhered and the gapping agent 5 uniformly dispersed, a liquid crystal display panel with uniform spacing can be obtained.

〔Effect of the invention〕

As described above, the present invention includes a step of mixing a gapping agent, an organic adhesive, and a volatile organic solvent to form a mixed solution, a step of spraying this onto a glass substrate in a heated atmosphere, and a step of forming a mixed solution on a glass substrate. There is a step of stacking the glass substrates with the sprayed surfaces facing inside and bonding the glass substrates with an organic adhesive formed around the gapping agent. Therefore, (a) the mixed solution contains a volatile organic solvent that has excellent wettability with the gapping agent, so the gapping agent is uniformly dispersed in the mixed solution, and the volatile organic solvent is more volatile in this mixed solution. Since the atomization is carried out in a heated atmosphere where it is easy to spray, the volatile organic solvent evaporates during the flight, and the organic adhesive is formed around the gapping agents individually dispersed in the solution as cores, which form on the surface of the glass substrate. It is evenly distributed and adheres to the surface. In this way, an organic adhesive is formed around each gapping agent on the glass surface, and since these are uniformly dispersed on the glass substrate, a mass of many gapping agent particles does not form, and this aggregation causes The gap between the glass substrates does not increase, and the gap between the glass substrates is
(b) The mixed solution containing the gapping agent is sprayed onto the glass substrate. Compared to the method of applying the gapping agent by printing, this method does not require a printing mask, printing machine, etc., and also allows the gapping agent to be distributed on the glass substrate while being continuously conveyed by a belt, etc. (c) The gapping agent uniformly distributed over the entire surface of the glass substrate bonds the glass substrates together with the organic adhesive formed around it. Because it is fixed, the distance between the two glass substrates is uniform even when using glass substrates that are deformed such as warping or have undulations on the surface. This is especially useful for high-duty and large-scale applications that require large-area, flat glass substrates. We can provide capacitive liquid crystal display panels of high quality and at low prices.

This has a remarkable effect.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a conventional liquid crystal display panel. FIG. 3 is a sectional view showing a liquid crystal display panel according to the present invention. 1, 2...Glass substrate, 3...Spacer,
4, 5... Gap agent, 6... Liquid crystal, 7... Epoxy resin.

Claims (1)

[Scope of Claims] 1. A step of mixing a gapping agent, an organic adhesive, and a volatile organic solvent to form a mixed solution; and a step of spraying the mixed solution onto a glass substrate in a heated atmosphere; A liquid crystal display comprising the steps of stacking glass substrates with the surfaces sprayed with the mixed solution facing inside, and bonding the glass substrates together using the organic adhesive formed around the gapping agent. A method of manufacturing a display panel.