US 11,699,378 B2
Gamma reference voltage generator selecting one of black candidate voltages as black gamma voltage and display apparatus including the same
Yunki Baek, Suwon-si (KR); Nam-Gon Choi, Yongin-si (KR); and Hansin Lim, Hwaseong-si (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed by SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed on Jun. 23, 2021, as Appl. No. 17/355,446.
Claims priority of application No. 10-2020-0100141 (KR), filed on Aug. 10, 2020.
Prior Publication US 2022/0044616 A1, Feb. 10, 2022
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2007 (2013.01) [G09G 2300/0842 (2013.01); G09G 2310/027 (2013.01); G09G 2310/0243 (2013.01); G09G 2310/0291 (2013.01); G09G 2320/0276 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A gamma reference voltage generator, comprising:
a first resistor string configured to receive a first reference voltage and a second reference voltage;
a plurality of black voltage setters configured to extract a plurality of black candidate voltages from the first resistor string;
a selector configured to select one of the black candidate voltages as a black gamma voltage based on a selection signal, the selection signal generated based on a black level command signal applied from a host;
a second resistor string configured to receive a first voltage and a second voltage,
the second voltage extracted from the first resistor string, and the first voltage extracted from the first resistor string and transmitted from one of the black voltage setters to the second resistor string without being transmitted through the selector; and
a plurality of gamma voltage setters configured to extract a plurality of gamma voltages from the second resistor string,
wherein the first voltage is predetermined from the black candidate voltages independently from the black gamma voltage.