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Method and apparatus for sealing liquid crystal display element cell
| Details |
Inventors: Matsuzawa, Tadashi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Eisenhut; Heidi L.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A liquid crystal display element cell is obtained by setting two substrates to oppose each other at a predetermined gap and sealing a liquid crystal in the space formed between the substrates. An apparatus for sealing the liquid crystal display element cell includes seal rings, pressure plates, a pressure mechanism, and a compressed gas supply mechanism. The seal rings are formed to surround the display surface of the liquid crystal display element cell. Each seal ring has a Z-shaped section. Each pressure plate has a groove which fits with a corresponding seal ring therein, and a pressurized air injection port on the inner side of which is surrounded by the groove. Each pressure plate is placed on the upper and lower surfaces of the liquid crystal display element cell to be in contact with the seal rings. Pressure regions are formed in the spaces surrounded by the pressure plates, the liquid crystal display element cell, and the seal rings. The pressure mechanism presses the pressure plates with a predetermined pressure. The compressed gas supply mechanism supplies a pressurized gas of a predetermined pressure to the injection port. |
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DETAILED DESCRIPTION The present invention has been made in consideration of the above situation in the prior art, and has as its object to provide a method and apparatus for sealing a liquid crystal display element cell, in which the gap between the substrates of the liquid crystal display element cell in which a liquid crystal is sealed can be accurately set to a predetermined value.
In order to achieve the above object, according to the present invention, in the method and apparatus for sealing the liquid crystal display element cell in which the display surface of the liquid crystal display element cell is pressed with a gas, prior to sealing the opening of the liquid crystal display element cell, Z-rings each having a Z-shaped section are used as seal rings for forming pressure regions into which a pressurized gas is to be introduced to perform gap adjustment of the liquid crystal display element cell.
Since the seal ring is formed into a Z-letter shape, a hermetic state can be maintained even under a high pneumatic pressure.
In other words, the area of the contact portion of the seal ring (to be referred to as the Z-ring hereinafter) increases, and the contact pressure can be increased by the pressure applied to the Z-ring, so that gas leakage will not be caused.
Thus, a method and apparatus for sealing a liquid crystal display element cell, in which the liquid crystal display element cell can be uniformly pressed and the cell gap of the liquid crystal display element cell can be obtained with a high quality and high precision, can be provided.
More specifically, in the Z-ring, since the sealing width can provide a sufficiently larger area than that of a conventional O-ring, leakage does not occur from the contact point between the liquid crystal display element cell and the Z-ring.
When a pressurized gas is applied to the Z-ring, the inclined portion of the Z-ring is lifted to the liquid crystal display element cell side due to the pressure of the pressurized gas, and the liquid crystal display element cell can be sealed with a higher pressure than the pressure that presses it
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LCD 
