US 11,862,070 B2
Source driver and display device
Kenichi Shiibayashi, Yokohama (JP); and Kenichi Shigeta, Yokohama (JP)
Assigned to LAPIS Technology Co., Ltd., Yokohama (JP)
Filed by LAPIS Technology Co., Ltd., Yokohama (JP)
Filed on Mar. 13, 2022, as Appl. No. 17/693,393.
Claims priority of application No. 2021-056868 (JP), filed on Mar. 30, 2021; and application No. 2021-157992 (JP), filed on Sep. 28, 2021.
Prior Publication US 2022/0319403 A1, Oct. 6, 2022
Int. Cl. G09G 3/32 (2016.01); H03F 3/04 (2006.01); G02F 1/1362 (2006.01)
CPC G09G 3/32 (2013.01) [H03F 3/04 (2013.01); G02F 1/136286 (2013.01); G09G 2310/027 (2013.01); G09G 2310/0291 (2013.01); G09G 2330/12 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A source driver which is connected to a display panel including a plurality of source lines and a plurality of pixel units connected to the plurality of source lines, receives a video data signal including a series of pixel data pieces, and outputs a gradation voltage to be applied to the plurality of pixel units based on the video data signal, the source driver comprising:
a first gradation voltage generation unit which generates a gradation voltage of a first polarity to be supplied to a pixel on a first source line of the plurality of source lines;
a first amplifier which receives an input of the gradation voltage of the first polarity to an input end, amplifies the gradation voltage of the first polarity, and outputs a voltage from an output end;
a second gradation voltage generation unit which generates a gradation voltage of a second polarity corresponding to a polarity opposite to the first polarity to be supplied to a pixel on a second source line corresponding to a source line provided in the vicinity of the first source line;
a second amplifier which receives an input of the gradation voltage of the second polarity to an input end, amplifies the gradation voltage of the second polarity, and outputs a voltage from an output end; and
a voltage comparison unit which compares a voltage of the input end of the second amplifier with a voltage of the output end of the second amplifier and outputs a comparison result.