Automatic contrast adjusting device

Details Automatic contrast adjusting device Automatic contrast adjusting device

1993-11-24

1997-03-04

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 98, 349161, G09G 318

Patent

active

056084226

ABSTRACT:
An automatic contrast adjusting device which is capable of providing an optimum LCD contrast for a user's eyes as the user desires. A CPU references a characteristic table listing temperatures vs. liquid crystal drive voltages in a RAM in response to temperature data from a thermistor, reads a PWM value (liquid crystal drive voltage) corresponding to the temperature data, and outputs a PWM pulse of a duty ratio corresponding thereto. On the other hand, when the user manually adjusts the contrast by handling a contrast switch, characteristic data in the RAM is corrected in response to the adjustment amount, and is then written into an EEPROM.

REFERENCES:
patent: 4799072 (1989-01-01), Akimoto et al.
patent: 4923285 (1990-05-01), Ogino et al.
patent: 5027111 (1991-06-01), Davis et al.
patent: 5138305 (1992-08-01), Tomiyasu
patent: 5206633 (1993-04-01), Zalph
patent: 5245326 (1993-09-01), Zalph

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