公开(公告)号：US10943535B2

公开(公告)日：2021-03-09

申请号：US16162004

申请日：2018-10-16

Applicant: Samsung Display Co., Ltd.

Inventor： Hansin Lim

IPC: G09G3/3233 ,  H01L51/50

Abstract: An organic light emitting display device includes a display panel, a gamma reference voltage generator, and a gamma voltage generator. The gamma reference voltage generator provides the data voltage having a predetermined voltage level to the display panel, changes brightness of the display panel by sequentially reducing the data voltage, determines a critical voltage by comparing a changing amount of the brightness to a predetermined reference changing amount of the brightness, and determines the gamma reference voltage based on the critical.

公开(公告)号：US11699378B2

公开(公告)日：2023-07-11

申请号：US17355446

申请日：2021-06-23

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Yunki Baek ,  Nam-Gon Choi ,  Hansin Lim

IPC: G09G3/20

CPC classification number: G09G3/2007 ,  G09G2300/0842 ,  G09G2310/027 ,  G09G2310/0243 ,  G09G2310/0291 ,  G09G2320/0276

Abstract: A gamma reference voltage generator includes a first resistor string, black voltage setters, a selector, and a second resistor string. The first resistor string receives a first reference voltage and a second reference voltage. The black voltage setters extract a plurality of black candidate voltages from the first resistor string. The selector selects one of the black candidate voltages as a black gamma voltage based on a selection signal. The second resistor string receives a first voltage corresponding to one of the black candidate voltages and a second voltage extracted from the first resistor string. In addition, the gamma reference voltage generator includes gamma voltage setters that extract a plurality of gamma voltages from the second resistor string.