Transflective liquid crystal display with enhanced contrast rati

Details Transflective liquid crystal display with enhanced contrast rati Transflective liquid crystal display with enhanced contrast rati

1983-05-31

1985-09-17

Corbin, John K.

350345, 350339D, G02F 113

Patent

active

045416923

ABSTRACT:
A back lighted transflective liquid crystal display with improved contrast ratio has a light mask positioned between the transflective element and the source of back lighting. The mask has light transmitting sections which are aligned with and have the same configuration as the indicia-forming electrodes in the cell. The mask has opaque or light blocking sections that are aligned with the background portion of the cell. In the transmissive mode light impinges on the cell only in the area of the indicia-forming electrodes, thereby enhancing the contrast ratio between the indicia and background portions of the cell.

REFERENCES:
patent: 3950078 (1976-04-01), Zatsky
patent: 4042294 (1977-08-01), Billings, Jr. et al.
patent: 4188094 (1980-02-01), Fergason
patent: 4294518 (1981-10-01), O'Connor et al.
patent: 4398805 (1983-08-01), Cole

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