Patent ID: 11929041
Assignee: HIMAX TECHNOLOGIES LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A display apparatus, comprising:
a backlight module having a plurality of backlight zones;
a liquid crystal display (LCD) panel over the backlight module; and
a local dimming control circuit configured to generate a local dimming data signal for the backlight module and compensated pixel data for the LCD panel based on image data and an arrangement of the backlight zones of the backlight module, the image data having a plurality of image areas respectively corresponding to the backlight zones, and the local dimming control circuit comprising:
a backlight luminance calculator that performs local dimming configuration by calculating a luminance table with luminance values respectively corresponding to the backlight zones from the image data to generate the local dimming data signal; and
a pixel compensator that performs first and second pixel compensations on the image data according to the luminance table to generate the compensated pixel data;

wherein for a first image area of the image areas being a low-luminance image area and a luminance intensity of a first backlight zone of the backlight zones corresponding to the first image area being less than a luminance intensity of a second backlight zone corresponding to a second image area of the image areas neighboring the first image area, the pixel compensator performs the first pixel compensation for high-luminance pixels in the second image area by multiplying a first gray level of the high-luminance pixels in the second image area with a first compensation gain, and performs the second pixel compensation for low-luminance pixels in the second image area by multiplying a second gray level of the low-luminance pixels in the second image area with a second compensation gain which is greater than the first compensation gain, wherein the second compensation gain is positively correlated with the number of high-luminance pixels in the second image area.