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Apparatus and method for controlling liquid crystal display brightness, and liquid crystal display device

  • US 9,953,587 B2
  • Filed: 06/17/2016
  • Issued: 04/24/2018
  • Est. Priority Date: 09/01/2015
  • Status: Active Grant
First Claim
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1. An apparatus for controlling liquid crystal display brightness, the apparatus comprising:

  • a subarea image grayscale determining section configured to determine image grayscale values of subarea image data blocks corresponding to backlight subareas according to a received image signal;

    a subarea backlight value pre-obtaining section configured to pre-obtain subarea backlight values corresponding to the subarea image data blocks according to the image grayscale values of the subarea image data blocks;

    a subarea backlight value gain section configured to multiply the pre-obtained subarea backlight values with a preset backlight value gain coefficient to obtain gained backlight values of the backlight subareas, wherein the preset backlight value gain coefficient is more than 1;

    a subarea backlight value outputting section configured to output the respective gained subarea backlight values to driver circuits of backlight sources in the corresponding backlight subareas to control the brightness of the backlight sources in the corresponding backlight subareas as a result of driving;

    a subarea backlight value adjusting section configured to determine a subarea backlight value adjustment coefficient, and to further multiply the gained subarea backlight values with the corresponding backlight value adjustment coefficient to obtain adjusted subarea backlight values, wherein if the pre-obtained subarea backlight values or the gained subarea backlight values are below a first threshold, then the backlight value adjustment coefficient is less than 1, the subarea backlight value outputting section configured to output the adjusted respective subarea backlight values to the driver circuits of the backlight sources in the corresponding backlight subareas to control the brightness of the backlight sources in the corresponding backlight subareas as a result of driving; and

    an image grayscale compensating section configured to determine a subarea image data block with the adjusted subarea backlight value below the first threshold, and to compensate for the grayscale value of each image pixel in the subarea image data block using a preset grayscale compensation coefficient larger than 1.

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