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LOCAL-DIMMING METHOD, LIGHT SOURCE APPARATUS PERFORMING THE LOCAL-DIMMING METHOD AND DISPLAY APPARATUS HAVING THE LIGHT SOURCE APPARATUS

  • US 20100060671A1
  • Filed: 03/31/2009
  • Published: 03/11/2010
  • Est. Priority Date: 09/05/2008
  • Status: Active Grant
First Claim
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1. A local-dimming method for driving a light source module in a display device, the light source module comprising a plurality of independently controllable light-emitting blocks, each of the light-emitting blocks comprising a plurality of sets of light sources, each set of light sources consisting of one or more light sources, different sets of light sources of each light-emitting block emitting different colors, different sets of light-sources being independently controllable according to one or more driving parameters to allow each light-emitting block to be driven by a first color-dimming process in which each light-emitting block'"'"'s output chromaticity and luminance depend on an image displayed by the display device, the local-dimming method comprising:

  • (a) in each of one or more color-dimming periods of time, driving each said light-emitting block by the first color-dimming process;

    (b) in each of one or more compensating periods of time, driving each said light-emitting block by a full-color process which is independent of the image;

    (c) in each of said one or more compensating periods of time, while driving each said light-emitting block by the full-color process, sensing light emitted by at least one of the light sources, and based on the sensing, determining the one or more driving parameters'"'"' reference driving values operable to generate a reference color by the light-emitting blocks;

    (d) in at least one of the color-dimming and compensating periods of time, driving each said light-emitting block using the one or more driving parameters'"'"' values which depend on the reference driving values; and

    (e) between at least one of the color-dimming periods and an adjacent one of the compensating periods, gradually switching the light-source module between a state in which the luminance of each said light-emitting block is determined by the first color-dimming process and a state in which the luminance of each said light-emitting block is determined by the full-color process.

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