US 12,148,394 B2
Variable tap gamma amplifier, gamma voltage generator, and display driving integrated circuit
Taek Su Kwon, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on May 1, 2023, as Appl. No. 18/310,334.
Claims priority of application No. 10-2022-0079881 (KR), filed on Jun. 29, 2022.
Prior Publication US 2024/0005877 A1, Jan. 4, 2024
Int. Cl. G09G 3/3275 (2016.01)
CPC G09G 3/3275 (2013.01) [G09G 2310/027 (2013.01); G09G 2320/0276 (2013.01); G09G 2320/0673 (2013.01); G09G 2330/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gamma voltage generation circuit comprising:
a first resistor string connected between a 0-th terminal and a first terminal, and configured to output first gamma voltages;
a first variable tap gamma amplifier configured to output a first tap voltage to the first terminal using a first reference voltage; and
a gamma control logic circuit configured to selectively activate a first tap change signal based on a first grayscale ratio of first line data,
wherein the first variable tap gamma amplifier is configured to output a second tap voltage to a first intermediate terminal of the first resistor string using a second reference voltage in response to activation of the first tap change signal.