JPS63110418A - Manufacture of liquid crystal display panel - Google Patents

Abstract

PURPOSE:To obtain a highly reliable liquid crystal display panel which is free from fluctuation of the dimensions of a sealing agent, by applying the sealing agent to an injecting hole in a state where two transparent substrates in the vicinity of the injecting hole of the panel are pushed toward another by means of a pressing jig, etc., with a fixed pressure and completely sealing the panel after the sealing agent is sucked in the panel by removing the pressure. CONSTITUTION:A panel is pressed with a fixed pressure by means of a panel pressing jig 6 and the panel is depressed before applying an enclosing agent 4 to an injecting hole 4. When the sealing agent 5 is applied to the injecting hole 4 under this condition and the pressure is removed by removing the jig 6 after applying the agent 5, the panel returns to its original state where it is not depressed and the sealing agent 5 is sucked in the panel. The panel pressing conditions (pressure, pressing place, etc.) depend upon the shape of the panel. Therefore, a liquid crystal display panel which is high in airtightness, reliability, and quality and free from fluctuation of shape and dimensions is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of manufacturing a liquid crystal display panel used for displaying calculators and the like.

2. Description of the Related Art A conventional method for sealing a liquid crystal display panel is as shown in FIG. In FIG. 2, 1 is a transparent substrate on which a transparent electrode is formed, 2 is a sealant, 3 is a liquid crystal 14 is an injection hole, and 5 is a transparent substrate on which a transparent electrode is formed.
is a sealant. In general, a room-temperature curing type of pagination agent is used to prevent reaction with the liquid crystal.

The problem that the invention seeks to solve The state in which liquid crystal is injected up to the injection hole (Figure 2a).

Even if a sealant is applied in step b), the sealant does not penetrate into the panel and complete sealing is not possible, resulting in problems such as air bubbles entering the panel (Fig. 2, C).

Therefore, it is common practice to preheat the liquid crystal injected panel before applying the sealant. however,
The preheating temperature is limited to several tens of degrees due to reaction with the liquid crystal, and there are problems in that complete sealing is not possible, and preheating the panel causes the sealant to spread and the shape and dimensions to be unstable.

The present invention solves these problems, and aims to manufacture an extremely reliable liquid crystal display panel that is completely sealed and does not allow air bubbles to enter the panel during use, and in which the size of the sealant is stable. The purpose is to

Means for Solving the Problem In order to solve this problem, the present invention uses a sealant while pressing the two transparent substrates near the vane hole with a holding jig or the like at a constant pressure. The sealant was applied to the injection hole and the pressure was removed to draw the sealant into the panel, completely sealing it.

Function: By this method, it is possible to manufacture a liquid crystal display panel that can be completely sealed, has extremely high reliability, and has no variation in the size of the sealant and has high quality.

Embodiment FIG. 1 illustrates a method for sealing a liquid crystal display panel according to an embodiment of the present invention. In FIG. 1, 11 is a transparent substrate on which a transparent electrode is formed, 2 is a sealant, 3 is a liquid crystal, and 4 is a transparent substrate on which a transparent electrode is formed.
6 is an injection hole, 6 is a sealant, and 6 is a panel pressing jig. Before applying the sealant 5 to the injection hole 4, the panel is pressed to a constant pressure using a panel pressing jig 6 to dent one panel (FIGS. 1a and 1b). In this state, a sealant 5 is applied to the injection hole 4 (FIG. 1c, d). When the coating is finished, the panel pressure jig 6 is removed and the pressure is removed. As a result, the panel is no longer dented and returns to its original state, and the sealant 5 is drawn into the panel (FIG. 1 θ, f).

The panel pressurizing conditions (pressure, location, etc.) vary depending on the shape of the panel.

Effects of the Invention As described above, according to the present invention, it is possible to produce a liquid crystal display panel having high airtightness, extremely high reliability, and quality with no variation in the shape and size of the sealant.

[Brief explanation of the drawing]

FIGS. 1A, 1C, and 1E are process diagrams showing a method for sealing a liquid crystal display panel according to an embodiment of the present invention. d and f are A-persons in Figure 1 a, c, and e, respectively. Cross-sectional view taken along lines B-B' and C-Cj', FIG. 2a. C is a process diagram showing a conventional sealing method, and FIG. 2 is a cross-sectional view taken along lines DD' and -E' in FIGS. 2a and 2c, respectively. 1...Transparent substrate, 2...Sealing agent, 3
...Liquid crystal, 4...Injection hole, 5...
・Sealant, 6...Panel pressure jig.

Claims (1)

[Claims] Two transparent substrates with transparent electrodes formed on their surfaces are adhered with a sealing agent such as epoxy resin with a certain gap provided, an injection hole is provided in at least one place in the sealing resin, and a liquid crystal substance is injected through the injection hole. A method for manufacturing a liquid crystal display panel, characterized in that the injection hole is sealed with a sealant such as an epoxy resin while the two transparent substrates are pressed at a constant pressure.