Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1999-11-10
2001-12-18
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S096000, C349S158000, C349S117000, C428S040100, C428S215000
Reexamination Certificate
active
06331882
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical member being additionally provided with a pressure sensitive adhesion layer, which is capable of forming a resin type liquid-crystal cell little warped and suitable for producing a liquid-crystal display, or the like, and a resin type cell substrate therefor.
The present application is based on Japanese Patent Application No. Hei. 10-353887 which is incorporated herein by reference.
2. Description of the Related Art
Since a liquid-crystal cell using a glass substrate has become heavy and bulky with the advance of increase in size of a liquid-crystal display (LCD), or the like, variety of liquid-crystal cells using various kinds of resin substrates have been proposed for the purpose of reduction in size and weight, or the like. The resin type liquid-crystal cells heretofore proposed, however, have been not put into practical use yet because a warp (curl) problem occurred when an optical material such as a polarizing plate, a phase-difference plate, an elliptically polarizing plate formed by lamination thereof, or the like, was adhesively bonded to each of the liquid-crystal cells through an adhesive layer. The aforementioned optical material such as a polarizing plate, or the like, is a key device for the LCD. Accordingly, use of the optical material cannot be avoided.
SUMMARY OF THE INVENTION
An object of the present invention is to develop an optical member which can form a liquid-crystal cell little warp and excellent in performance in practical use when an optical material is adhesively bonded through an adhesive layer, and a resin type cell substrate therefor.
The present invention provides an optical member made from an optical material either one of or each of two surfaces of which is coated with a pressure sensitive adhesion layer having a 1000% elastic modulus in a range of from 3 g/mm
2
to 10 g/mm2 at 90° C., wherein the optical member exhibits characteristic in which the quantity of curl is not larger than 3 mm per 12 inches when the optical member adhesively bonded to a resin substrate through the pressure sensitive adhesion layer is heated at 80° C. for 150 hours.
Further, the present invention provides a cell substrate comprising a resin substrate having a curl quantity of not larger than 3 mm per 12 inches when such an optical member as defined above is heated at 80° C. for 150 hours after the optical member is adhesively bonded to the resin substrate through the pressure sensitive adhesion layer, and provides a liquid-crystal display wherein such an optical member as defined above is adhesively bonded, through a pressure sensitive adhesion layer of the optical member, to either one of or each of two surfaces of a liquid-crystal cell formed by use of such a cell substrate as defined above.
By provision of an optical member having a pressure sensitive adhesion layer with the aforementioned characteristic, the warp of a resin type thin and light liquid-crystal cell can be reduced practically sufficiently while advantages of the resin type liquid-crystal cell are used effectively. Accordingly, increase in size of an LCD, or the like, due to a resin type cell substrate can be promoted advantageously. Further, by the provision of an optical member having a pressure sensitive adhesion layer additionally provided onto an optical material in advance, the optical member can be adhesively bonded to a liquid-crystal cell easily. Accordingly, efficiency in assembling an LCD is excellent, so that assembling loss, or the like, caused by both variation in quality and contamination with dust, or the like, can be prevented.
REFERENCES:
patent: 4292370 (1981-09-01), Pekko
patent: 4358494 (1982-11-01), Akimoto et al.
patent: 4387133 (1983-06-01), Ichikawa et al.
patent: 5880800 (1999-03-01), Mikura et al.
patent: 6040026 (2000-03-01), Iwabuchi et al.
Satake Masayuki
Shimodaira Kiichi
Nitto Denko Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
Ton Toan
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