Circuit and a method for controlling a backlight of a liquid cry

Details Circuit and a method for controlling a backlight of a liquid cry Circuit and a method for controlling a backlight of a liquid cry

1996-05-09

1998-12-29

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 63, 345211, 39575003, 39575008, G09G 336

Patent

active

058546170

ABSTRACT:
A backlight luminescence control device for use in a portable computer to control a backlight of a liquid crystal display. When an AC adaptor is not connected to the portable computer, the device senses the voltage level of a DC battery and generates an electrical signal that indicates the status of the battery. From the voltage level of the DC battery, the device ascertains the appropriate luminescence level of a cold-cathode fluorescent backlight lamp (CCFL), automatically controls the brightness of the CCFL through several levels of luminosity, and optimizes the luminescence of the CCFL according to the voltage level available in the DC battery.

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