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Title:
LIQUID CRYSTAL DISPLAY
Document Type and Number:
Japanese Patent JPS58186723
Kind Code:
A
Abstract:

PURPOSE: To improve the display quality of a negative display with virtually no sacrifice of the base characteristic of a twisted nematic panel, by adding a die having positive dichromaticity in a liquid crystal layer.

CONSTITUTION: The light polarized by a lower polarization plate 5 is deviated 90° in the polarization direction thereof in an upper substrate 1 with respect to a lower substrate 2 and is made perpendicular to the polarization axis of an upper polarization plate 6 according to the twisting of liquid crystal molecules. The light polarized by the plate 5 is absorbed by a dichromatic dye. Therefore, the transmissivity of a non-lighting part 11 decreases. The liquid crystal molecules are made nearly perpendicular to the substrate in the selective part 12 where the axes of polarization of the upper and lower polarization plates coincide, thus losing optical rotatory power. The dichromatic dye is roughly perpendicular to the substrate but in such a state the absorption of the light by the dichromatic dye is small. The transmissivity in the part 12 is thus increased. The negative display is made possible by the twisted nematic effect obtained by adding the positive dichromatic dye 13 on account of the above-mentioned principle.


Inventors:
Jinguu, Keiji
Application Number:
JP1982000069868
Publication Date:
October 31, 1983
Filing Date:
April 26, 1982
Export Citation:
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Assignee:
SEIKO EPSON CORP
International Classes:
G02F1/1337; G02F1/137; G02F1/139; (IPC1-7): G02F1/133; G02F1/137; G09F9/00
Domestic Patent References:
JPS528843A
JPS5117695A



 
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