KR20020091701A - Method for filling liquid crystal in liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal implantation method for a liquid crystal display device is provided to reduce the generation of foam when implanting liquid crystal for reducing the reject and carry out the implantation at a single step by heating under the vacuum state. CONSTITUTION: In a liquid crystal implantation method for a liquid crystal display device, liquid crystal is implanted to a synthetic resin film substrate(3) while heating in a vacuum chamber(1), wherein the heating is carried out at 150°C for four hours or less by heating units(5).

Description

Liquid crystal injection method of liquid crystal display device {METHOD FOR FILLING LIQUID CRYSTAL IN LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal injection method of a liquid crystal display device, and more specifically, to omit the step of removing the gas adsorbed on the film substrate, while heating in a vacuum state before the liquid crystal injection while simultaneously injecting the liquid crystal to reduce the manufacturing defects A liquid crystal injection method of a liquid crystal display device.

In general, a liquid crystal display device using a film substrate is, for example, by inserting a liquid crystal between two substrates made of a synthetic resin material such as plastic and attaching a polarizing plate to the outer surface of the substrate. The liquid crystal is operated according to the electric signal input to the located electrode to adjust the polarization direction of the light through the polarizer to control the passage and blocking of light.

The liquid crystal injection method of the liquid crystal display device according to the prior art performs a degassing process for each process to remove the gas adsorbed on the plastic substrate. When forming ITO electrodes, sealing (SEAL) printing, and injecting liquid crystals, all of the pre-process degassing processes are performed.

The liquid crystal injection method of the liquid crystal display according to the prior art will be briefly described as follows.

First, the plastic substrate is heated in a vacuum environment to reduce gas absorption on the plastic substrate surface prior to electrode formation or sealing process.

Then, the degassing process is performed before forming the transparent electrode, and the plastic substrate is formed during the degassing process. At this time, the plastic substrate is higher than the temperature at which the transparent electrode is formed.

Then, the plastic substrate is heated. The heating temperature at this time is about 130 to 140 degrees Celsius, the transparent electrode forming temperature is about 100 to 120 degrees Celsius.

The moisture on the substrate is then removed in a vacuum environment before sealing.

The plastic substrate is then reheated at about 110 degrees Celsius, at which time the pressure is lowered relatively.

Subsequently, the degassing process is performed before forming the transparent electrode in a vacuum environment.

It is then heated on the plastic substrate surface prior to liquid crystal injection in a vacuum environment for degassing.

Meanwhile, a jig is used to prevent deformation of the plastic substrate during the degassing process.

However, the liquid crystal injection method of the conventional liquid crystal display device has the following problems.

In the liquid crystal injection method of the liquid crystal display according to the prior art, the process of degassing during the process (DEGASSING) process, the process of degassing during all the process may cause a lot of defects during the process.

In addition, the liquid crystal injection method of the liquid crystal display device according to the prior art has to be installed a degassing device, a vacuum equipment and an adsorption device, and furthermore there is a problem that the production yield is reduced if the degassing process is not completed.

Accordingly, the present invention has been made to solve the problem according to the prior art, the object of the present invention is to omit the degassing process in all processes of the liquid crystal display device and simultaneously inject the liquid crystal while heating in a vacuum state before the liquid crystal injection Accordingly, the present invention provides a liquid crystal injection method of a liquid crystal display device which reduces manufacturing defects and improves manufacturing yield.

1 is a liquid crystal injector according to the present invention

Explanation of symbols on the main parts of the drawings

1; vacuum chamber 3; substrate

5; heating device 7; glass stick

9; liquid crystal bar

A liquid crystal injection method of a liquid crystal display device according to the present invention for achieving the above object, in the liquid crystal injection method of a liquid crystal display device having a synthetic resin substrate, at the time of liquid crystal injection on the synthetic resin substrate using a liquid crystal injection device The liquid crystal is injected at the same time as heating in a vacuum state.

Hereinafter, a liquid crystal injection method of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a love injector with a heating device according to the invention.

The liquid crystal injection method of the liquid crystal display device according to the present invention, as shown in Figure 1, using a predetermined liquid crystal injection device having a glass stick 7 and a liquid crystal bar (9) in the vacuum chamber (1) The liquid crystal is injected onto the film 3 made of synthetic resin, and the liquid crystal injection device is provided with a heating device 5 so that the liquid crystal is deposited on the film substrate 3 for a predetermined temperature and a predetermined time at the same time as the liquid crystal injection. Inject in.

Since the film itself generates bubbles in the film substrate 3, bubbles are removed in a vacuum state and liquid crystal is injected onto the film substrate 3 using a capillary principle. In this case, when removing the bubbles, it is preferable to heat the film substrate 3 using the heating device 5 in order to remove bubbles from the film substrate even more smoothly.

As described above, the liquid crystal injection method of the liquid crystal display device according to the present invention is carried out in parallel with the liquid crystal injection using a predetermined liquid crystal injection device having the heating device 5, so that the substrate 3 Heat up for a temperature and time. On the other hand, since the substrate 3 is a film material and is weak in heat, the substrate 3 is limited to a heating temperature which does not cause deformation of the film substrate 3. Therefore, the heating temperature of the film substrate 3 is preferably 150 degrees Celsius or less.

As described above, the heating device 5 provided in the liquid crystal injection device facilitates the removal of bubbles existing in the cell of the film substrate 3. That is, since the film used in the film substrate liquid crystal display device contains bubbles easily, the heating device 5 functions to smoothly discharge the gas and bubbles contained in the film through heating.

In addition, the liquid crystal injection method of the liquid crystal display device according to the present invention injects liquid crystal into the film substrate 3 while simultaneously heating the vacuum chamber 1 for 4 hours. At this time, in order to inject the liquid crystal into the film substrate 3, the vacuum degree is set to atmospheric pressure, and a liquid crystal bar 9 (BAR) is bonded to the liquid crystal injection hole to inject the liquid crystal.

Various embodiments can be easily implemented as well as self-explanatory to those skilled in the art without departing from the principles and spirit of the present invention. Accordingly, the claims appended hereto are not limited to those already described above, and the following claims are intended to cover all of the novel and patented matters inherent in the invention, and are also common in the art to which the invention pertains. Includes all features that are processed evenly by the knowledgeable.

As described above, the liquid crystal injection method of the liquid crystal display according to the present invention has the following effects.

In the present invention, it is possible to reduce the generation of bubbles during the liquid crystal injection of the film liquid crystal display device, thereby reducing defects in the manufacturing process, and to improve the manufacturing yield by injecting the liquid crystal under heating and vacuum in a single process during liquid crystal injection. You can.

Claims (4)

In the liquid crystal injection method of the liquid crystal display device having a synthetic resin substrate, A liquid crystal injection method of a liquid crystal display device, characterized in that the liquid crystal is injected at the same time as the liquid crystal injection device is heated in a vacuum state when the liquid crystal injection on the synthetic resin substrate. The method of claim 1, The heating temperature is a liquid crystal injection method of the liquid crystal display device, characterized in that less than 150 degrees Celsius. The method of claim 1, The heating time is a liquid crystal injection method of the liquid crystal display device, characterized in that 4 hours or less. The method of claim 1, And the liquid crystal injection device comprises a heating device.