JPS6097321A - Charging method of liquid crystal - Google Patents

Abstract

PURPOSE:To charge a liquid crystal into a liquid crystal display panel having a large display area without mixing air bubbles by using the capillary phenomenon to charge the liquid crystal into the gap part between two substrates and giving ultrasonic oscillation to both substrates. CONSTITUTION:A charging hole 6 and an air discharge hole 7 are provided in positions facing each other on the outside circumference of the gap part between substrates 1 and 2 provided with plural linear transparent electrodes 3 and 4, and a liquid crystal 8 is charged into the gap part. In this case, the capillary phenomenon is used; and when the liquid crystal 8 is filled in the charging hole 6 and ultrasonic oscillation is given to substrates 1 and 2 by an ultrasonic oscillating machine 10, air bubbles 9 rise toward the air discharge hole 7 because of buoyancy or are made minute and are pressed up to the air discharge hole 7 together with the liquid crystal 8 because air bubbles 9 are easy to move in the liquid crystal, and they are discharged to the outside. Thus, air bubbles 9 are removed from the gap part, and the liquid crystal 8 is charged there.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for injecting liquid crystal into a liquid crystal display channel with a large display screen without introducing air bubbles or the like.

[Conventional technique/previous]

In the liquid crystal display panel currently in practical use, liquid crystal is injected into the gap between two substrates. Because the substrate constituting the channel (in other words, display) is small, it was possible to inject liquid crystal without introducing air bubbles or the like due to capillary action just by filling the liquid crystal injection port with liquid crystal.

By the way, recently there has been an increasing demand for liquid crystal displays with large display areas. However, as the display area becomes larger, it is impossible to avoid air bubbles from being mixed in using the conventional injection method that uses only capillary action. If the bubbles are large, the surface tension of the bubbles becomes larger than the force pushing up the liquid crystal due to the b-tubule phenomenon, and as a result, there is a drawback that it becomes difficult to remove the bubbles from the liquid crystal.

[Boming's purpose]

The present invention was made in order to solve the two drawbacks of the prior art, and provides a method for injecting a product that can inject seventh order crystal into a liquid crystal display panel with a large display area without introducing air bubbles. The purpose is to achieve this goal.

[Summary of investigation]

In order to achieve this object, the present invention utilizes capillarity to fully inject liquid crystal into the gap between two substrates constituting a liquid crystal display panel, and at the same time applies ultrasonic vibration to the side substrates. This allows air bubbles mixed in the liquid crystal to be easily discharged to the outside from the air vent port.

〔Example〕

An embodiment of the method for injecting a product according to the present invention will be described below with reference to the drawings. ri 1-sided board, 2
is a rear substrate, and linear transparent electrodes 3 and 4 are arranged on the opposing surfaces of side substrates 1 and 2, respectively, and these transparent electrodes 3 and 4 intersect at right angles to each other. ing. That is, each transparent electrode 4 arranged on the rear substrate 2 extends in a direction perpendicular to the drawing.

A gap 5 between the front substrate 1 and the rear substrate 2 is set to 10 to 50 μm using a spacer (not shown).
9, an inlet 6 and an air vent 1'7 are provided on the opposite side of the outer periphery, and the remaining outer periphery is protected from adhesives, etc. , I'm doing it.

Therefore, when the entire liquid crystal 8 is injected into the gap 5, when the injection port 6 is filled with the liquid crystal 8, the liquid crystal 8 enters the gap 5 due to the capillary phenomenon and advances in the direction of the air vent 1''7. I'm leaving. However, when the display area is wide, the front substrate 1 and the rear substrate 2 are large, and the distance from the injection port 6 to the air vent lower and the distance in the direction perpendicular to Figure 1i'i, i are long. A bubble 9 will be created in the middle of 5,
If this bubble 9 is large, its surface tension becomes larger than the force pushing up the entire liquid crystal 8 in the direction of the air vent 1 due to capillary phenomenon, and the liquid crystal 8 remains in the air bubble 9 (I'i gap 5). 9 and reaches the air vent lower.

Therefore, in the present invention, ultrasonic vibrations are applied to the front substrate 1 and the rear substrate 2 by the ultrasonic single movable rock 10.

When ultrasonic vibrations are applied to the side substrates 1 and 2 in this way, the air bubbles 9 move more easily in the liquid crystal, and either the air vent γ completely rises by itself due to buoyancy, or the air bubbles 9 become fine and the liquid crystal 8
At the same time, the air is pushed up to the air vent 1 and discharged to the outside.

In this way, the air bubbles 9 are eliminated from the gap 5.

In the embodiment shown above, the bubbles 9 generated in the gap 5 are made to move easily in the liquid crystal 8 by applying ultrasonic waves to the two substrates 1.2. , ' or the air bubbles 9 are made microscopic by the ultrasonic pulse, so the air bubbles 9 can be easily removed from the gap 5. .

Next, other embodiments will be described.

In the above-mentioned embodiment, only the ultrasonic motion was applied to the front substrate 1 and the rear substrate 2 by the ultrasonic motor 10, but if the pressure of the air vent γ was further lowered by 8 steps, the air Since the air bubbles 9 become smaller, the air bubbles 9 generated in the gap 5 become smaller, and the effect of removing the air bubbles 90 by ultrasonic vibration can be further enhanced.

The injection speed of the liquid crystal 8 can be increased by lowering the pressure of the air vent lower and increasing the pressure of the liquid crystal 8 in the injection port 6. If the pressure of the liquid crystal 8 in the injection port 6 is increased only by increasing the pressure of the liquid crystal 8 at the air vent γ, the effect will be reduced. That is, in this case, the 71 da crystal 8 tries to completely flow through the gap 5 where it can easily pass through, so the number of bubbles 90 increases, and in order to extract the bubbles 9 from the air vent lower, the liquid crystal 8 also has to move considerably. This is because it must be emitted or destroyed. However, if the discharged liquid crystal 8 is collected, the above-mentioned effect can be obtained.

Furthermore, when the pressure of the air vent lower is completely lowered, the pressure of the injection port 6 is also lowered for a while, which has the advantage that the generation of air bubbles 9 is greatly reduced.

[Effect between lights]

As explained above, this investigation is based on (2)
Liquid crystal is injected between the two substrates using the tube III phenomenon, and ultrasingle wave motion is applied to both substrates.
)/ζ, the air bubbles in the 71 d crystal can be easily removed, and therefore a 1 d crystal display panel with a large display area without the inclusion of air bubbles can be realized. Can be used for injection methods.

[Brief explanation of drawings]

, A1 is an example f of the method for implanting '1' crystals according to the present invention.
: It is a U-hat θ side view of a liquid crystal display panel for explanation. 1...Front board 2...Rear board 3, 4...f
Bright pole 5... Gap 6... Injection 1'' γ...
Air vent 8...LCD 9...Air/(!l IU・
...Ultrasonic Vibration/Ring Patent Applicants: Okiden, Chi Kogyo Co., Ltd., Patent Attorney: Takashi Kanakura

Claims (1)

[Claims] (1) A liquid crystal display panel constructed by providing a gap between two substrates on which several linear transparent electrodes are arranged, and injecting liquid crystal into the gap. In this liquid crystal injection method, an injection port and an air vent are provided facing each other on the outer periphery of the gap, the other outer periphery is sealed with an adhesive, and the injection port is filled with liquid crystal. A liquid crystal injection method characterized by injecting liquid crystal into the gap by capillary action and applying ultrasonic pulse to the two substrates.2. 2. The method of injecting liquid crystal according to claim 1, characterized in that the pressure at the air vent port is lowered, or the pressure at the injection port is increased and the pressure at the air vent port is lowered. 3. While applying ultrasonic vibration to the two substrates, the pressure at the air vent is lowered, the pressure at the injection port is simultaneously lowered, and the pressure at the injection port is increased later. How to inject liquid crystals.