	US 12,230,177 B2
	Light emitting display device and driving method thereof
Da Hye Kwon, Paju-si (KR); Byung Jae Lee, Paju-si (KR); and Jung Heo, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Oct. 31, 2022, as Appl. No. 17/977,797.
Claims priority of application No. 10-2021-0193351 (KR), filed on Dec. 30, 2021.
Prior Publication US 2023/0215308 A1, Jul. 6, 2023
Int. Cl. G09G 3/00 (2006.01); G09G 3/3233 (2016.01); G09G 3/3291 (2016.01)

CPC G09G 3/006 (2013.01) [G09G 3/3233 (2013.01); G09G 3/3291 (2013.01); G09G 2300/0819 (2013.01); G09G 2300/0842 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0295 (2013.01); G09G 2330/12 (2013.01)]

12 Claims

1. A light emitting display device, comprising:

a display panel comprising subpixels connected to a reference line; and

a data driver connected to data lines of the display panel,

wherein the data driver is configured to simultaneously acquire degradation information values as to the subpixels respectively through the data lines after driving transistors comprised respectively in the subpixels perform a source-following operation by a reference voltage transmitted through the reference line and a data voltage for sensing transmitted through the data lines, and

wherein the data driver is further configured to:

determine parasitic capacitances formed respectively at the data lines based on a previously-extracted lookup table, and

estimate degradation degrees of the driving transistors comprised respectively in the subpixels, with the parasitic capacitances removed, based on the degradation information values acquired respectively through the data lines and based on the respective parasitic capacitances determined based on the previously-extracted lookup table.

5. A light emitting display device, comprising:

a display panel comprising subpixels connected to a reference line; and

a data driver connected to data lines of the display panel,

wherein the data driver is configured to:

vary a reference voltage transmitted through the reference line and a data voltage for sensing transmitted through the data lines during the same period such that the reference voltage and the data voltage for sensing are equal to each other, after driving transistors comprised in the subpixels perform a source-following operation by the reference voltage and the data voltage for sensing, and

then simultaneously acquire amounts of current flowing respectively through the data lines as degradation information values of the subpixels.