Liquid crystal cells – elements and systems – Particular excitation of liquid crystal
Patent
1995-06-06
1997-04-01
Gross, Anita Pellman
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
349 86, 349 92, G02F 1133, G02F 11333
Patent
active
056172281
ABSTRACT:
When two substrates for a polymer-dispersed liquid crystal display panel are joined with a polymer-dispersed liquid crystal layer therebetween, a substrate supporting stage of a substrate joining machine is controlled to keep the uniformity in the screen of a space between the two substrates at a visually satisfactorily uniform level, thereby enabling to produce a liquid crystal display device provided with a polymer-dispersed liquid crystal layer having high uniformity in the screen. The above stage is preferably a transparent plate such as a quartz substrate. The transparent plate is used to uniformly and effectively irradiate the liquid crystal layer with ultraviolet rays to cure the liquid crystal layer by photo-setting. Besides, the two substrates having the polymer-dispersed liquid crystal layer therebetween are irradiated with light, interference fringes formed are observed, and a liquid crystal layer thickness value and the unevenness of the liquid crystal layer thickness can be detected based on the unbalance of a plane distribution and a density of the interference fringes. Based on the detected liquid crystal layer thickness value and unevenness of the liquid crystal layer thickness, the position and pressure of the supporting stage can be controlled to suppress the unevenness of the liquid crystal layer thickness and the variation of the pressure in the display screen to a level which does not effect on the reduction in display quality.
REFERENCES:
patent: 4435047 (1984-03-01), Fergason
patent: 4688900 (1987-08-01), Doane et al.
patent: 5469278 (1995-11-01), Takahara
patent: 5519519 (1996-05-01), Hideaki et al.
Nakamura Hiroki
Watanabe Yoshihiro
Gross Anita Pellman
Kabushiki Kaisha Toshiba
Ngo Julie-Huyen
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