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

Patent 5898041 Issued on April 27, 1999. Estimated Expiration Date:

February 28, 2016. 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. 608109 filed on 02/28/1996

US Classes:

522/81, Heavy metal containing DNRM349/122, Particular nonoptical film or layer (e.g., adhesive layer, barrier layer)349/153, Liquid crystal seal522/83, Oxygen containing DNRM522/103, With ethylenic reactant522/142, Chemical reactant has two or more ethylenic groups522/182, Carboxylic acid or derivative522/183Oxygen other than as part of a COO-group

Examiners

Primary: Berman, Susan W.

Attorney, Agent or Firm

Merchant, Gould, Smith, Edell, Welter & Schmidt, P.A.

Foreign Patent References

0 385 149 EP. 09/26/1990
0 646 632 EP. 04/26/1995
2 634 778 FR. 02/26/1990
58-105124 JP. 06/26/1983
59-137929 JP. 08/26/1984
59-232315 JP. 12/26/1984
61-145586 JP. 07/26/1986
62-089025 JP. 04/26/1987
01-266510 JP. 10/26/1989
3-143911 JP. 06/26/1991
3-288129 JP. 12/26/1991
3-273215 JP. 12/26/1991
4-011223 JP. 01/26/1992
4-051023 JP. 02/26/1992
4-33910 JP. 02/26/1992
4-291237 JP. 10/26/1992
05-273560 JP. 10/26/1993
6-160872 JP. 06/26/1994
7-013173 JP. 01/26/1995
7-013174 JP. 01/26/1995
2 272 906 GB. 06/26/1994
2 279 656 GB. 01/26/1995

International Classes

C08F 002/48
C09J 163/10
C09J 004/02

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.