Gamma correction apparatus for a liquid crystal display
AssigneeHimax Technologies Limited
InventorLin-Kai Bu
Life of this patent
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Abstract
A gamma correction apparatus set in a liquid crystal display (LCD), comprising a gray-scale voltage generating circuit and a gamma correction circuit. The gray-scale voltage generating circuit includes the common gray-scale voltage generating circuit and a plurality of individual gray-scale voltage generating circuits, wherein every individual gray-scale voltage generating circuit generates individual gray-scale voltage and corresponds to one of the displaying colors of the pixels of the LCD panel. The gamma correction circuit, according to the corresponding color of the pixel signal, selects the common gray-scale voltage and the corresponding individual gray-scale voltages of the color, and then outputs a pixel voltage corresponding to the pixel signal.
Claims29
A gamma correction apparatus for outputting a corresponding pixel voltage according to a pixel signal for a liquid crystal display (LCD), wherein the LCD has a plurality of pixels used to display a plurality of colors, the gamma correction apparatus comprising:
- a gray-scale voltage generating circuit, which comprises:
- a common gray-scale voltage generating circuit for generating a plurality of common gray-scale voltages;
- and
- a plurality of individual gray-scale voltage generating circuits, coupled to the common gray-scale voltage generating circuit, wherein each of the individual gray-scale voltage generating circuits generates a plurality of individual gray-scale voltages corresponding to one of the colors, and the values of the individual gray-scale voltages generated by each individual gray-scale voltage generating circuit are determined according to what color the individual gray-scale voltage generating circuit corresponds to;
- and
- a gamma correction circuit, coupled to the common gray-scale voltage generating circuit and the individual gray-scale voltage generating circuits, wherein according to a corresponding color of the pixel signal, the gamma correction circuit generates the corresponding pixel voltage based on the common gray-scale voltages and the corresponding individual gray-scale voltages of the corresponding color.
A gamma correction apparatus for outputting a corresponding pixel voltage according to a pixel signal for a liquid crystal display (LCD), wherein the LCD has a plurality of pixels used to display the colors red, green, and blue, the gamma correction apparatus comprising:
- a gray-scale voltage generating circuit, comprising:
- a common gray-scale voltage generating circuit for generating a plurality of common gray-scale voltages;
- a red individual gray-scale voltage generating circuit coupled to the common gray-scale voltage generating circuit for generating a plurality of red gray-scale voltages;
- a green individual gray-scale voltage generating circuit coupled to the common gray-scale voltage generating circuit for generating a plurality of green gray-scale voltages;
- and
- a blue individual gray-scale voltage generating circuit coupled to the common gray-scale voltage generating circuit for generating a plurality of blue gray-scale voltages;
- and
- a gamma correction circuit coupled to the common gray-scale voltage generating circuit and the red, green, and blue individual gray-scale voltage generating circuits;
- wherein the gamma correction circuit outputs the pixel voltage corresponding to the pixel signal based on:
- the common gray-scale voltages and the red gray-scale voltages when the pixel signal is used to display the color red;
- the common gray-scale voltages and the green gray-scale voltages when the pixel signal is used to display the color green;
- and
- the common gray-scale voltages and the blue gray-scale voltages when the pixel signal is used to display the color blue.
A liquid crystal display (LCD), comprising:
- a plurality of pixels for displaying a plurality of colors;
- and
- a gamma correction apparatus, which outputs a corresponding pixel voltage according to a pixel signal, comprising:
- a gray-scale voltage generating circuit, comprising:
- a common gray-scale voltage generating circuit for generating a plurality of common gray-scale voltages;
- and
- a plurality of individual gray-scale voltage generating circuits, coupled to the common gray-scale voltage generating circuit, wherein each of the individual gray-scale voltage generating circuits generates a plurality of individual gray-scale voltages, each individual gray-scale voltage generating circuit corresponds to one of the colors, and the values of the individual gray-scale voltages generating from each individual gray-scale voltage generating circuit is determined according to what color the individual gray-scale voltage generating circuit corresponds to;
- and
- a gamma correction circuit, coupled to the common gray-scale voltage generating circuit and the individual gray-scale voltage generating circuits, wherein according to a color corresponding to the pixel signal, the gamma correction circuit generates the corresponding pixel voltage based on the common gray-scale voltages and the corresponding individual gray-scale voltages of the corresponding color.
Dependencies are inferred from the claim text.