Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1997-10-10
1999-07-06
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349114, 349 96, G02F 11333, G02F 11335
Patent
active
059203676
ABSTRACT:
In a liquid crystal display device of the present invention, a white plate light source such as a cool cathode fluorescent tube is provided on a back surface of a liquid crystal cell, i.e., on a surface opposite to a displaying surface of the liquid crystal cell. On a surface opposite to the displaying surface of the liquid crystal panel, a polarizing plate-equipped semitransmitting reflecting plate is provided. The liquid crystal panel is composed of active elements such as MIM (Metal-Insulator-Metal) elements or TFTs (Thin Film Transistors). With this arrangement, discharge of a charge is suppressed by switching of the active element when a voltage is applied to two types of electrodes sandwitching a liquid crystal layer. By setting reflectance and transmittance of the polarizing plate-equipped semitransmitting reflecting plate such that contrast of the liquid crystal panel is higher when the cool cathode fluorescent tube is not lighted than when the cool cathode fluorescent tube is lighted, it is ensured that visibility both in a reflecting mode and a transmitting mode are improved.
REFERENCES:
patent: 4637687 (1987-01-01), Haim et al.
patent: 4657348 (1987-04-01), Ziegler
patent: 5724112 (1998-03-01), Yoshida et al.
Kajimoto Koichi
Seike Takeshi
Conlin David G.
Nguyen Dung
Sharp Kabushiki Kaisha
Sikes William L.
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