Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1998-02-06
2000-05-09
Mengistu, Amare
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
349130, 349177, G09G 336
Patent
active
060610425
ABSTRACT:
A liquid crystal display device includes a liquid crystal display cell having a layer of a twisted-nematic liquid crystal material with a positive dielectric anisotropy constant and constructed such that a plurality of voltage potentials applied to the liquid crystal cell may firstly induce a Freedricksz transition of the liquid crystal material and then select either one of first and second metastable states caused by relaxation of the liquid crystal material succeeding the Freedricksz transition. A first voltage potential is adjusted higher than a threshold voltage necessary to cause changes from an initial state to the metastable states, a second voltage potential to select one of the metastable states is adjusted in comparison with a voltage potential necessary to switch between the metastable states, and a third voltage potential is applied as a modulation voltage during or succeeding the application of the second voltage potential. By applying at least one of these voltage potentials, the modulation of the metastable states can be carried out, thereby causing arbitrary changes in transmittance of the liquid crystal cells and achieving a multilevel gray scale in the liquid crystal display device.
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Kameyama Kenji
Kanemoto Akihiko
Matsumoto Fuminao
Miyagaki Kazuya
Takahashi Hiroyuki
Mengistu Amare
Ricoh & Company, Ltd.
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