Viewing angle compensation of LCD display

Details Viewing angle compensation of LCD display Viewing angle compensation of LCD display

1996-12-31

1998-10-06

Zele, Krista

Telephonic communications

Substation or terminal circuitry

Visual signalling

379435, 379436, 379441, 345 87, 345147, H04M 100, G09G 336, G09G 510

Patent

active

058189254

ABSTRACT:
The characters of liquid crystal display devices (LCDs) normally exhibit asymmetrical visibility or identifiability dependent upon the direction from which the display is viewed. The asymmetrical identifiability is controllable by the bias applied to the LCD. The contrast of a liquid crystal display device used in a telephone apparatus is automatically controlled by a position sensing switch in accordance with the spatial orientation of the telephone apparatus in order to select the bias that will effectuate the greatest identifiability for the characters of display.

REFERENCES:
patent: 5109219 (1992-04-01), Kastan et al.
patent: 5187743 (1993-02-01), Gumb et al.
patent: 5189404 (1993-02-01), Masimo et al.
patent: 5233339 (1993-08-01), Newman et al.
patent: 5517212 (1996-05-01), Inoue

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