US 12,322,349 B2
Data driving circuit and display device
Jinhee Jung, Paju-si (KR); and MooKyoung Hong, Paju-si (KR)
Assigned to LG Display Co., Ltd., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Aug. 25, 2022, as Appl. No. 17/895,958.
Application 17/895,958 is a division of application No. 17/544,792, filed on Dec. 7, 2021, granted, now 11,450,284.
Claims priority of application No. 10-2020-0173964 (KR), filed on Dec. 14, 2020.
Prior Publication US 2022/0415266 A1, Dec. 29, 2022
Int. Cl. G09G 3/3291 (2016.01); G09G 3/00 (2006.01); G09G 3/3233 (2016.01)
CPC G09G 3/3291 (2013.01) [G09G 3/006 (2013.01); G09G 3/3233 (2013.01); G09G 2310/08 (2013.01); G09G 2320/029 (2013.01); G09G 2320/043 (2013.01); G09G 2320/045 (2013.01); G09G 2320/0626 (2013.01); G09G 2330/021 (2013.01); G09G 2330/12 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A display device comprising:
a plurality of subpixels disposed on a display panel;
a plurality of reference voltage lines electrically coupled to some of the plurality of subpixels; and
a data driving circuit configured to drive the plurality of reference voltage lines,
wherein the data driving circuit includes:
a first sensing switch electrically coupled to a first reference voltage line among the plurality of reference voltage lines, and a second sensing switch electrically coupled to a second reference voltage line among the plurality of reference voltage lines;
a sensing capacitor electrically coupled to the first sensing switch and the second sensing switch; and
a sampling switch electrically coupled to the sensing capacitor,
wherein the data driving circuit is configured to detect a characteristic value of a first subpixel of the plurality of subpixels by the first reference voltage line when the first sensing switch is turned on in a first sensing period, and to detect the characteristic value of a second subpixel of the plurality of subpixels by the second reference voltage line when the second sensing switch is turned on in a second sensing period,
wherein, a compensation voltage is supplied to the first subpixel electrically coupled to the first reference voltage line and to the second subpixel electrically coupled to the second reference voltage line during a display driving period between the first sensing period and the second sensing period, the compensation voltage being determined based on the characteristic value of the first subpixel detected through the first reference voltage line,
wherein each of the plurality of subpixels comprises a light emitting device and a driving transistor for driving the light emitting device, and
wherein the characteristic value of the first subpixel or the second subpixel includes at least one of mobility of the driving transistor, a threshold voltage of the driving transistor, or a threshold voltage of the light emitting device,
wherein, in a display driving period after the second sensing period, a first compensation voltage is supplied to subpixels electrically coupled to the first reference voltage line, and a second compensation voltage is supplied to subpixels electrically coupled to the second reference voltage line, and
wherein the first compensation voltage is determined based on the characteristic value of the first subpixel detected through the first reference voltage line in the first sensing period, and the second compensation voltage is determined based on the characteristic value of the second subpixel detected through the second reference voltage line in the second sensing period.