US 12,118,959 B2
Gamma voltage generating circuit, source driver and display device including the same
Su Bin Kim, Yongin-si (KR); and Se Byung Chae, Yongin-si (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Apr. 18, 2023, as Appl. No. 18/136,299.
Application 18/136,299 is a continuation of application No. 17/694,624, filed on Mar. 14, 2022, abandoned.
Application 17/694,624 is a continuation of application No. 16/805,804, filed on Mar. 1, 2020, granted, now 11,276,370, issued on Mar. 15, 2022.
Claims priority of application No. 10-2019-0026480 (KR), filed on Mar. 7, 2019; and application No. 10-2019-0050928 (KR), filed on Apr. 30, 2019.
Prior Publication US 2023/0252956 A1, Aug. 10, 2023
Int. Cl. G09G 5/10 (2006.01); G09G 3/20 (2006.01); G09G 3/3275 (2016.01); G09G 3/36 (2006.01); G06F 1/3234 (2019.01); G09G 3/3208 (2016.01)
CPC G09G 5/10 (2013.01) [G06F 1/3265 (2013.01); G09G 3/2007 (2013.01); G09G 3/3208 (2013.01); G09G 3/3275 (2013.01); G09G 3/3696 (2013.01); G09G 2310/0267 (2013.01); G09G 2310/027 (2013.01); G09G 2310/0291 (2013.01); G09G 2310/061 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0276 (2013.01); G09G 2320/0673 (2013.01); G09G 2330/021 (2013.01); G09G 2330/022 (2013.01); G09G 2330/028 (2013.01); G09G 2340/0435 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display device comprising:
a display panel including a scan line, a data line, and a pixel connected to the scan line and the data line;
a gate driver configured to supply a scan signal to the scan line; and
a source driver configured to supply a data voltage to the data line,
wherein the source driver includes:
a gamma voltage generator configured to generate gamma voltages having voltage levels different from each other in response to a gamma enable signal;
a digital-to-analog converter configured to generate the data voltage corresponding to a gray scale value using the gamma voltages; and
a source buffer configured to output the data voltage to the data line, wherein the gamma voltage generator includes:
a first resistor string configured to set a voltage range of the gamma voltages;
a second resistor string configured to set tab gamma voltages corresponding to some of the gamma voltages within the voltage range;
gamma buffers configured to output the tab gamma voltages; and
a third resistor string including tabs respectively connected to output terminals of the gamma buffers, the third resistor string being configured to divide a voltage between the tabs to generate the gamma voltages,
wherein the gamma voltage generator, in response to the gamma enable signal, outputs the tab gamma voltages during a part of a horizontal time and stops outputting some of the tab gamma voltages during a rest of the horizontal time, and
wherein the scan signal has a turn-off voltage level in the part of the horizontal time.