公开(公告)号：US20240331656A1

公开(公告)日：2024-10-03

申请号：US18609715

申请日：2024-03-19

Applicant: LAPIS Technology Co., Ltd.

Inventor： Kenji Yanagawa

IPC: G09G3/36

CPC classification number: G09G3/3696 ,  G09G2310/08 ,  G09G2320/0673 ,  G09G2330/12

Abstract: A source driver of the disclosure supplies a display device having a plurality of display cells with gradation voltages corresponding to respective luminance levels for the display cells indicated by a video signal. The source driver includes a gamma voltage generating circuit and a gradation voltage determination circuit. The gamma voltage generating circuit includes a resistor voltage dividing circuit with a plurality of output terminals. The plurality of output terminals output respective reference voltages divided according to gamma curve characteristics for generating the gradation voltages. The gradation voltage determination circuit measures an electric potential difference between one pair among the plurality of output terminals and determines whether or not the electric potential difference corresponds to a reference voltage group based on the gamma curve characteristics.