Liquid crystal display circuit

Details Liquid crystal display circuit Liquid crystal display circuit

1990-09-26

1993-06-08

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340811, 340813, G02F 113, G08B 536

Patent

active

052183521

ABSTRACT:
A liquid crystal display (LCD) circuit comprising a duty changing device for changing the driving duty cycle of an LCD in accordance with a power supply switching command signal, and a bias changing device for changing the display bias voltage produced by a bias producing device to cause the LCD to display information, in accordance with a power supply switching command signal externally supplied to the LCD circuit. Even when electric power to be supplied from plural power supplies to the bias producing device is switched in accordance with the power supply switching command signal, a change in the display contrast of the LCD can be suppressed.

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"MN1871610 LSI Instruction Manual", First Edition, Prepared by Matsushita Electronics Corporation, Oct., 1988, pp. 87-95.

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