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

Claim 5:
6. A local dimming control circuit, comprising:
a backlight luminance calculator configured to generate a local dimming data signal for a backlight module and compensated pixel data for a LCD panel based on image data and an arrangement of backlight zones of the backlight module associated with the LCD panel, the image data having a plurality of image areas respectively corresponding to the backlight zones, and the backlight luminance calculator performing 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 configured to determine whether a first image area of the image areas is a low-luminance image area and, in response to a determination that the first image area is a low-luminance image area and a luminance intensity of a first backlight zone of the backlight zones corresponding to the first image area is 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, perform first and second pixel compensations on the image data according to the luminance table to generate the compensated pixel data, wherein the pixel compensator performs 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 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.