JPH0378724A - Production of liquid crystal panel - Google Patents

Abstract

PURPOSE:To form a uniform gap in the panel and to eliminate unequal colors by vacuum packaging the liquid crystal panel and evenly and uniformly pressurizing the panel under atm. pressure, thereby expelling the excess liquid crystal. CONSTITUTION:The liquid crystal panel is put by directing the injection port of the liquid crystal panel after the injection of a liquid crystal 6 therein toward the bottom of a vacuum packaging material 1 into the vacuum packaging material 1 which is previously sealed at a sealing resin 7 by heat sealing and the aperture of the vacuum packaging material 1 is heat-sealed, by which the entire part of the liquid crystal panel is vacuum-packaged. The state of uniformly and evenly pressurizing the entire part of the liquid crystal panel by the atm. pressure is maintained in such a manner to push out the excess liquid crystal to the outside of the liquid crystal panel. The part not sealed with the sealing resin 7 is strongly pushed, by which the previously heat-sealed part is peeled and the sealing resin 7 is poured to the periphery of the liquid crystal injection port to seal the port. The unequal gap of the liquid crystal panel is suppressed in this way and the unequal colors are eliminated.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing a liquid crystal panel.

BACKGROUND OF THE INVENTION The display quality of conventional liquid crystal display devices has improved year by year, and as a result, uniformity of gaps within the panel and strict control of the gaps are required.

A conventional gap control method for a liquid crystal panel will be explained below.

FIG. 4 shows an example of a conventional method for making the gap uniform in a liquid crystal panel. In FIG. 4, 2.5 is a substrate with a transparent electrode, 3 is a spacer, 4 is a sealing resin, 6 is a liquid crystal, and 10.11 is a press stage.

Immediately after the liquid crystal is injected by the reduced pressure injection method, the gap in the effective display area of the liquid crystal panel becomes larger than the particle size of the spacer 3, as shown in FIG.
As shown in the figure, the liquid crystal panel is sandwiched between stages 10 and 11 made of steel plates or resin, mechanically pressed from above and below to expel excess liquid crystal 6, and after forming a predetermined gap, It was sealed with resin.

Problems to be Solved by the Invention However, in the conventional configuration described above, the smoothness of the stages 10 and 11 is often not sufficient, and furthermore, the parallelism between the stages 10 and 11 becomes poor during pressing. , the liquid crystal channel is not pressed uniformly, and the gap varies depending on the location within the same panel. In other words, there was a problem in that unevenness in the gears occurred, resulting in color unevenness and degrading the display quality.

The present invention solves the above-mentioned conventional problems, and aims to suppress gap unevenness in a liquid crystal panel and eliminate color unevenness.

Means for Solving the Problems In order to achieve this object, the present invention seals a sealing resin made of an ultraviolet curing resin or a thermosetting resin in the bottom of a transparent bag-like vacuum packaging material by heat sealing, and seals a pair of transparent Transparent electrodes and alignment films are formed on the opposing surfaces of the substrates, and the liquid crystal panel is sealed with liquid crystal from the liquid crystal injection port through a spacer material and a sealing material on the periphery, and the liquid crystal panel is filled with the sealing resin of the bag-shaped vacuum packaging material. Insert the liquid crystal inlet into the remaining part with the liquid crystal injection port facing toward the bottom, vacuum package it, pressurize the liquid crystal channel at atmospheric pressure and expel excess liquid crystal, and then push out the sealing resin toward the liquid crystal panel side. , the liquid crystal injection port of the liquid crystal panel is sealed with a sealing resin.

Function According to the structure of the present invention, by applying atmospheric pressure to the liquid crystal nozzle after vacuum packaging, a uniform force applied to the entire panel, which could not be obtained with conventional press equipment, is achieved by atmospheric pressure, and unnecessary The liquid crystal is expelled and a uniform gap is created throughout. Furthermore, since the liquid crystal injection port is sealed with resin while maintaining this state, a liquid crystal channel can be obtained without introducing air bubbles from the injection port.

EXAMPLE An example of the present invention will be described below with reference to the drawings. Note that in FIGS. 1 to 4, the same parts as in FIG. 1 are given the same numbers.

(Example 1) Figures 1a and 1b are a side sectional view and a plan view showing the configuration of an example of the present invention during vacuum packaging. In Figure 1,
1 is a bag-shaped vacuum packaging material, 2.5 is a substrate with transparent electrodes formed on opposing surfaces, 3 is a spacer, 4 is a seal, 6 is a liquid crystal, 7 is a sealing resin, and 8 is a heater for heat sealing. First, a predetermined amount of sealing resin 7 such as ultraviolet curing resin or thermosetting resin is put into the bottom of vacuum packaging material 1, and heat sealing heater 8 is placed.
The upper part of the sealing resin 7 is heat-sealed and sealed. At this time,
If the amount of sealing resin 7 to be sealed is too large, the sealing resin will also wrap around the periphery of the liquid crystal panel other than the sealing side.
The amount of sealing resin is determined based on the size of the liquid crystal panel and the shape and number of liquid crystal injection ports, since this may stain the extraction electrodes.

Next, the liquid crystal panel is placed in the vacuum packaging material 1 which has been sealed with the sealing resin 7 by heat sealing in advance, with the injection port of the liquid crystal panel after pouring the liquid crystal 6 facing the bottom of the vacuum packaging material 1. heat seal the opening and vacuum package the entire LCD panel. In this way, the entire liquid crystal panel is kept uniformly and evenly pressurized at atmospheric pressure for 30 minutes or more to push excess liquid crystal out of the liquid crystal panel. Thereafter, by strongly pressing the portion in which the sealing resin 7 is sealed, the previously heat-sealed portion is peeled off, and the sealing resin 7 is poured around the liquid crystal injection port to seal it.

When the sealing resin 7 is of the ultraviolet curing type, the sealing resin 7 is cured by irradiating the sealing resin 7 with ultraviolet rays while still being vacuum-packed. When the sealing resin 7 is a thermosetting type, after sealing, the vacuum packaging material 1 is removed, excess sealing resin 7 is removed, and then the sealing resin 7 is thermosetted.

According to this implementation, by applying atmospheric pressure to the liquid crystal panel after vacuum packaging, a uniform force applied to the entire panel, which could not be obtained with conventional press equipment, is achieved by atmospheric pressure, and excess liquid crystal is expelled and spread over the entire panel. A uniform gap is created. Furthermore, since the liquid crystal injection port is sealed with resin while maintaining this state, a liquid crystal panel can be obtained without introducing air bubbles from the injection port.

(Example 2) A second example of the present invention will be described below with reference to the drawings. In FIGS. 2a and 2b, parts that are the same as those shown in FIG. 1 are given the same numbers and their explanations will be omitted. The difference from the embodiment shown in FIG. 1 is that a mold 9 is provided to prevent sealing resin 7 from being applied to areas other than the vicinity of the liquid crystal injection port.

With this configuration, in addition to the effects of the first embodiment,
When sealing the liquid crystal injection port with the sealing resin 7, it is possible to avoid conduction failure during mounting due to the extraction electrode on the liquid crystal injection port side and the extraction electrode on the column side being contaminated with the sealing resin 7.

In this way, by vacuum packaging the liquid crystal panel after liquid crystal injection and uniformly pressurizing it at atmospheric pressure, the excess liquid crystal 6 is expelled and the gap is sealed while maintaining a uniform gap. has been resolved, and better display quality can now be obtained. Further, by improving the uniformity within the panel, sufficiently excellent display is possible even in halftones.

In addition, in the second embodiment, the formwork 9 may be made of metal or resin. Furthermore, a metal coated with a resin may also be used. If a mold release agent is applied to the mold frame 9 in advance, the sealing resin can be easily removed after hardening.

Effects of the Invention As described above, the present invention vacuum-packs the liquid crystal panel and pressurizes it evenly and uniformly at atmospheric pressure to drive out excess liquid crystal, thereby achieving a uniform gap within the panel and eliminating color unevenness. be able to.

[Brief explanation of drawings]

Figures 1a and b are side sectional views and plan views showing the configuration of the first embodiment of the present invention during vacuum packaging, and Figure 2 aSb shows the configuration of the second embodiment of the present invention during vacuum packaging. 3 is a sectional view of a liquid crystal panel immediately after vacuum injection, and FIG. 4 is an explanatory diagram showing an example of a conventional method for making the gap uniform in a liquid crystal panel. 1... Vacuum packaging material, 2.5... Substrate with transparent electrode, 6... Liquid crystal, 7... Sealing resin, 8...・Heat seal heater.

Claims (1)

[Claims] A sealing resin made of an ultraviolet curable resin or a thermosetting resin is sealed in the bottom of a transparent bag-like vacuum packaging material, a transparent electrode and an alignment film are formed on the opposing surfaces of a pair of transparent substrates, and a spacer material and a peripheral portion are sealed. The liquid crystal panel filled with liquid crystal is laminated with a sealing material through the liquid crystal injection port and placed into the remaining portion of the bag-shaped vacuum packaging material that is not filled with sealing resin, with the liquid crystal injection port facing toward the bottom, and the liquid crystal panel is vacuum packaged. A method for manufacturing a liquid crystal panel, in which the liquid crystal panel is pressurized at atmospheric pressure while excess liquid crystal is expelled, the sealing resin is pushed out toward the liquid crystal panel, and the liquid crystal injection port of the liquid crystal panel is sealed with the sealing resin.