Production process of liquid crystal display panel, seal material for liquid crystal cell and liquid crystal display

Patent 6001203 Issued on December 14, 1999. Estimated Expiration Date:

December 10, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Liquid crystal display and photopolymerizable sealant therefor
Patent #: 4297401
Issued on: 10/27/1981
Inventor: Chern , et al.

Method of fabricating liquid crystal display cell
Patent #: 4364168
Issued on: 12/21/1982
Inventor: Matsuyama , et al.

Seal for liquid crystal display
Patent #: 4695490
Issued on: 09/22/1987
Inventor: McClelland , et al.

Liquid crystal display device
Patent #: 5387445
Issued on: 02/07/1995
Inventor: Horiuchi, et al.

5596023

Sealing composition for liquid crystal Patent #: 5596024
Issued on: 01/21/1997
Inventor: Horie, et al.

Inventors

Assignee

Matsushita Electric Industrial Co., Ltd.

Application

No. 988195 filed on 12/10/1997

US Classes:

156/106, With preformed intermediate adhesive layer156/107, Sandwich edge sealing156/272.2, With direct application of electrical, magnetic, or radiant energy to work156/273.3, Before final assembly; e.g., to cure lamina, etc.156/273.5, Before and after final assembly156/274.8, With application of adhesive156/275.5, To polymerize or cure material in work156/275.7, With application of adhesive349/122, Particular nonoptical film or layer (e.g., adhesive layer, barrier layer)349/123, Alignment layer349/190, Sealing of liquid crystal522/81, Heavy metal containing DNRM522/83, Oxygen containing DNRM522/103With ethylenic reactant

Examiners

Primary: Berman, Susan W.

Attorney, Agent or Firm

Merchant & Gould P.C.

Foreign Patent References

0 385 149 EP. 09/19/1990
0 646 632 EP. 04/19/1995
2 634 778 FR. 02/19/1990
58-105124 JP. 06/19/1983
59-137929 JP. 08/19/1984
59-232315 JP. 12/19/1984
61-145586 JP. 07/19/1986
62-89025 JP. 04/19/1987
1-266510 JP. 10/19/1989
3-143911 JP. 06/19/1991
3-273215 JP. 12/19/1991
3-288129 JP. 12/19/1991
4-11223 JP. 01/19/1992
4-51023 JP. 02/19/1992
4-33910 JP. 02/19/1992
4-291237 JP. 10/19/1992
5-273560 JP. 10/19/1993
6-160872 JP. 06/19/1994
7-13174 JP. 01/19/1995
7-13173 JP. 01/19/1995
2 272 906 GB. 06/19/1994
2 279 656 GB. 01/19/1995

International Classes

G02F 001/133.9
B32B 027/16
B32B 031/28

Foreign Application Priority Data

1995-03-01 JP

Abstract

This invention relates to a liquid crystal display apparatus formed by sealing a liquid crystal between two substrates having electrodes and an alignment film with a seal material, the production process comprising the steps of attaching two substrates in a vacuum, compressing under atmospheric pressure to provide a uniform cell gap, a temporary hardening process of the seal material by ultraviolet ray irradiation and a main hardening process of the seal material by heating, wherein a radically polymerizable curing resin is used in the liquid crystal seal material. The method provides a liquid crystal display panel having a uniform cell gap, without dislocation of the alighnment between substrates, or discharge of uncured component of a seal material to the liquid crystal, capable of having a seal material firmly attached to the substrates even at panel corner portions, and having an excellent straightness and moisture resistance of the seal material.