US 12,237,455 B2
Electroluminescence display apparatus including pixel sensing circuit
Ji Su Choi, Seoul (KR); Myung Gi Lim, Ansan-si (KR); Byung Jae Lee, Seoul (KR); and Jung Heo, Seoul (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG DISPLAY CO., LTD., Seoul (KR)
Filed on Dec. 10, 2021, as Appl. No. 17/548,046.
Claims priority of application No. 10-2020-0177267 (KR), filed on Dec. 17, 2020.
Prior Publication US 2022/0199876 A1, Jun. 23, 2022
Int. Cl. G09G 3/32 (2016.01); H01L 27/15 (2006.01); H01L 33/62 (2010.01)
CPC H01L 33/62 (2013.01) [G09G 3/32 (2013.01); H01L 27/156 (2013.01); G09G 2310/0291 (2013.01); G09G 2310/061 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electroluminescence display apparatus, comprising:
a pixel; and
a sensing circuit supplying a pixel reference voltage to the pixel through a reference voltage line in a display driving operation and sensing a pixel current, flowing in the pixel, through the reference voltage line in a sensing driving operation succeeding the display driving operation,
wherein the sensing circuit comprises:
a sensing channel terminal connected to the reference voltage line;
a first switch connected between the sensing channel terminal and an input terminal for the pixel reference voltage;
an integrator amplifier including a first input terminal, a second input terminal, and an output terminal;
an input terminal for an integrator reference voltage connected to the second input terminal of the integrator amplifier;
a second switch connected between the first input terminal and the output terminal of the integrator amplifier;
a first capacitor connected between the sensing channel terminal and the first input terminal; and
a second capacitor connected between the sensing channel terminal and the output terminal of the integrator amplifier,
wherein the sensing driving operation is performed in a vertical blank period succeeding a vertical active period,
wherein the vertical blank period comprises a reset period and a sensing period succeeding the reset period, and
wherein, in the reset period,
the first switch maintains an on state in the display driving operation,
the second switch is inverted from an off state to an on state, and
an integrator output voltage output through the output terminal of the integrator amplifier is the integrator reference voltage.