1980-06-09
1983-03-15
Corbin, John K.
350334, G02F 1133
Patent
active
043765670
ABSTRACT:
A two-layer twisted nematic type liquid crystal display device for providing improved contrast is provided. The interior surfaces of the transparent electrode plates of the cells have been treated so that the long axes of the liuqid crystal molecules adjacent the plates are aligned with the treated direction of the plates. The plates are disposed with the treated directions of opposed surfaces at 90.degree. angles to each other with the treated direction on the intermediate electrode surfaces of each cell being coincidental. Characters of the transparent electrodes are formed on the interior surfaces for forming displays having a reference direction from the upper or 12 o'clock position to the lower or 6 o'clock position. An upper and lower polarization plate having axes of polarization substantially parallel to each other are disposed on the outer surfaces of the device. Improved contrast is obtained in both the upper and lower displays when the device is viewed between the four-thirty and seven-thirty directions.
REFERENCES:
patent: 3944331 (1976-03-01), Janning
patent: 4099855 (1978-07-01), Wisbey et al.
patent: 4231639 (1980-11-01), Banda
Corbin John K.
Gallivan Richard F.
Kabushiki Kaisha Suwa Seikosha
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