US 12,087,197 B2
Device and method for driving a display panel using a scaled gamma curve
Hirobumi Furihata, Tokyo (JP); Tomoo Minaki, Tokyo (JP); Masao Orio, Tokyo (JP); and Takashi Nose, Tokyo (JP)
Assigned to Synaptics Incorporated, San Jose, CA (US)
Filed by Synaptics Incorporated, San Jose, CA (US)
Filed on Aug. 11, 2022, as Appl. No. 17/886,442.
Application 17/886,442 is a continuation of application No. 17/148,364, filed on Jan. 13, 2021, granted, now 11,443,671.
Prior Publication US 2022/0392385 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/20 (2013.01) [G09G 2310/027 (2013.01); G09G 2320/0276 (2013.01); G09G 2320/0626 (2013.01); G09G 2320/0673 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display driver, comprising:
control circuitry configured to:
store a default gamma curve,
determine, for a respective area of a display panel comprising a respective target pixel, a count of in-region pixels within the respective area, wherein the respective area has a total number of pixels including the respective target pixel and a number of neighboring pixels of the respective target pixel, and wherein the in-region pixels within the respective area are pixels which are located both in a predetermined region of the display panel and within the respective area,
determine a scale factor based on a ratio of the count of the in-region pixels within the respective area to the total number of pixels of the respective area, and
determine a modified gamma curve by scaling the default gamma curve with the scale factor; and
image processing circuitry configured to apply a gamma transformation based on the modified gamma curve to image data defined for the target pixel to generate output voltage data for the target pixel.