Patent
1989-04-27
1991-07-30
Miller, Stanley D.
350347R, 350347E, G02F 113
Patent
active
050354892
ABSTRACT:
An electro-optical device includes at least two adjacent transparent twisted nematic liquid crystal cells, each cell having a twisted nematic liquid crystal with a twist angle greater than 90.degree. between a pair of spaced apart opposed substrates with electrodes selectively disposed thereon. A linear polarizer is disposed on an exterior surface of each of the two cells. One of the two cells includes a plurality of electrodes for selectively producing a desired display. Application of a suitable voltage to the second cell compensates for changes in ambient temperature conditions or undesirable thicknesses in the liquid crystal materials of the two cells to ensure that a monochromatic display having excellent contrast is produced by the device and compensates for elliptically polarized light emitted by the first cell so that the device produces substantially linearly polarized light.
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patent: 4664482 (1987-05-01), Kando et al.
patent: 4715686 (1987-12-01), Iwashita et al.
patent: 4844569 (1989-07-01), Wada et al.
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patent: 4952029 (1990-08-01), Hayashi et al.
Iijima Chiyoaki
Kamada Satoshi
Okumura Osamu
Sato Yuzuru
Wada Hiroshi
Gross Anita Pellman
Miller Stanley D.
Seiko Epson Corporation
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