Richtek Technology Corporation

Wen-Hung Huang

Jing-Meng Liu

Chao-Hsuan Chuang

Nien-Hui Kung

Der-Jiunn Wang

Shin-Lung Ho

Cheng-Yuan Chang

In a gamma voltage generator and gamma voltage generating method that can tune the gamma voltages individually, several gamma currents of a same magnitude are generated for each to flow through a variable resistive element to generate a variable common voltage and several variable voltages, from which a common gamma voltage and several first gamma voltages are generated. By use of the symmetric property of the gamma curve corresponding to those gamma voltages to be generated, several voltages are generated by mapping the first gamma voltages with the common gamma voltage as the center axis, and from which several second gamma voltages are derived. The common gamma voltage and the first and second gamma voltages are provided for those gamma voltages corresponding to the gamma curve.

Gamma voltage generator and method thereof for generating individually tunable gamma voltages

A backlight power controller chip comprises a control circuit connected to two switches to turn on and off two display panels of a dual panel display handheld apparatus. The controller chip individually switches the two switches to control the backlight sources of the two display panels. The controller chip is available for various types of display panels.

Dual panel display backlight power controller chip for handheld apparatus

Growing community of inventors

Yangmei, Taiwan

Wen-Hung Huang