Patent
1988-12-07
1990-01-30
Miller, Stanley D.
350336, 350350S, 350346, 350331R, G02F 113
Patent
active
048969451
ABSTRACT:
A first transparent substrate has formed thereon a plurality of sequentially arranged first transparent electrodes and a plurality of individual cell drive lines each connected to one of them. A second transparent substrate has formed thereon at least one transparent electrode opposite the first transparent electrodes and first and second common drive lines each connected to one side of the second transparent electrode. The first and second transparent substrates are disposed opposite one another with a gap defined therebetween and the gap is filled with liquid crystal to form a liquid crystal cell array. Voltages of different magnitudes are applied to the first and second common drive lines to simultaneously form substantially the same voltage gradient in the second transparent electrode in all of cell windows, and at the same time, voltages corresponding to pixel signals are applied to the individual cell drive lines, respectively, thereby controlling the aperture ratios of all the cell windows. In driving a cell array using a two-frequency drive liquid crystal, in an operation mode for closing all the cell windows a low-frequency voltage is applied to the liquid crystal, and in an operation mode for diaphragming at least one of the cell windows, different high- or low-frequency voltages are applied to the first and second common drive lines, forming a high- or low-frequency voltage gradient in each cell window.
REFERENCES:
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Bak et al., "Fast Decay in a Twisted Nematic Induced by Frequency Switching", Journal of Appl. Phys., vol. 46, No. 1, Jan. 1975, pp. 1-4.
Masumori Tadaaki
Ooba Yuji
Sugihara Shigeo
Mai Huy K.
Miller Stanley D.
Nippon Telegraph and Telephone Corporation
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