Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-11-29
2010-11-30
Abdulselam, Abbas I (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
Reexamination Certificate
active
07843422
ABSTRACT:
An ambient light compensation circuit for controlling a backlight brightness is provided. The circuit automatically adjusts the LCD backlight brightness based on a reading of the ambient light. The circuit includes a non-linear ADC and a backlight control circuit. The non-linear ADC provides a digital signal from a photodiode signal. The backlight control circuit adjusts the brightness of the backlighting based on the digital signal. The brightness adjustment is performed gradually, e.g., one significant bit of the digital signal per second.
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Knausz Imre
Ludden Christopher A.
Abdulselam Abbas I
Frommer & Lawrence & Haug LLP
Gaffney Matthew M.
National Semiconductor Corporation
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