US 12,283,226 B2
Data driving circuit, display device including the same, and operating method of display device
Byung Ki Chun, Yongin-si (KR); Sun-Koo Kang, Yongin-si (KR); Myeongbin Lim, Yongin-si (KR); Min-Seok Bae, Yongin-si (KR); and Kanghee Lee, Yongin-si (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Display Co., LTD., Yongin-si (KR)
Filed on Aug. 21, 2023, as Appl. No. 18/236,011.
Claims priority of application No. 10-2022-0156775 (KR), filed on Nov. 21, 2022.
Prior Publication US 2024/0169894 A1, May 23, 2024
Int. Cl. G09G 3/32 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/32 (2013.01) [G09G 3/3291 (2013.01); G09G 2310/0275 (2013.01); G09G 2310/0291 (2013.01); G09G 2320/0276 (2013.01); G09G 2330/021 (2013.01); G09G 2330/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A data driving circuit comprising:
a reference voltage generator configured to receive a data control signal and to generate a gamma reference voltage and a test reference voltage;
a data driving unit configured to output a data signal for a pixel based on the gamma reference voltage; and
an output circuit configured to output a test data voltage for a dummy pixel based on the test reference voltage,
wherein the reference voltage generator includes:
a first input amplifier configured to receive an upper limit reference voltage;
a second input amplifier configured to receive a lower limit reference voltage;
a resistor string connected between an output terminal of the first input amplifier and an output terminal of the second input amplifier, and configured to output a plurality of voltages that have different voltage levels from each other;
a first output amplifier configured to output one of the plurality of voltages from the resistor string as the gamma reference voltage;
a decoder configured to select one voltage among the plurality of voltages in response to the data control signal; and
a second output amplifier configured to output a voltage selected by the decoder as the test reference voltage.