Backlight controller and liquid crystal display device
AssigneeKabushiki Kaisha Toshiba
InventorRitsuo Yoshida
Life of this patent
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Abstract
A backlight controller for controlling a backlight unit having a plurality of light sources arranged in a grid layout for illuminating a liquid crystal panel, the backlight controller including: a first calculator configured to calculate an average value and a standard deviation of control values for controlling the light sources, the control values being obtained from a feature quantity of an input image; a second calculator configured to calculate a ratio of the standard deviation to the average value; and a gain controller configured to control a gain to be applied to the control values based on the ratio calculated by the second calculator.
Claims5
A light source control apparatus for a light emitting module having a plurality of light sources respectively disposed for a plurality of light source areas to illuminate a liquid crystal panel with the light sources, the apparatus for controlling emission of the light sources and comprising:
- a first calculator configured to calculate an average value and a standard deviation of control values of the light sources, the control values being obtained from a feature quantity of an input image;
- a second calculator configured to calculate a ratio of the standard deviation to the average value that are calculated by the first calculator;
- and
- a gain controller configured to control a gain to be applied to the control values of the light sources based on the ratio calculated by the second calculator.
A liquid crystal display device comprising:
- a liquid crystal panel;
- a light emitting module having a plurality of light sources respectively disposed for a plurality of light source areas to illuminate the liquid crystal panel with the light sources;
- and
- a light source control module configured to control emission of the light sources,
- wherein the liquid crystal display device further comprises:
- a first calculation module configured to calculate an average value and a standard deviation of control values of the light sources, the control values being obtained from a feature quantity of an input image;
- a second calculation module configured to calculate a ratio of the standard deviation to the average value that are calculated by the first calculation module;
- and
- a gain controlling module configured to control a gain to be applied to the control values of the light sources based on the ratio calculated by the second calculation module.
Dependencies are inferred from the claim text.