Technique for increasing the visibility of an LCD panel during w

Details Technique for increasing the visibility of an LCD panel during w Technique for increasing the visibility of an LCD panel during w

1995-05-24

1997-06-03

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

345102, 345147, G02F 11335, G09G 336, G09G 510

Patent

active

056360410

ABSTRACT:
Method and apparatus for automatically increasing the visibility of an LCD during warm-up thereof is disclosed. In a preferred embodiment, the system of the present invention comprises brightness control circuitry electrically connected to an LCD panel of a portable personal computer (PC) or other battery operated electronic device for controlling the brightness level of the LCD. The brightness control circuitry is also electrically connected to receive a signal indicative of a brightness control level selected by a user using a user-settable control means, such as a brightness control knob located on the device. In operation, on power up of the LCD, the brightness control circuitry increases the LCD brightness to a maximum level, regardless of the brightness level selected by the user. Once the LCD has warmed up, the brightness control circuitry decreases the brightness level of the LCD to the level selected by the user. In one aspect of the invention, the brightness level is decreased incrementally such that its occurrence is virtually undetectable by the user.

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