Panel defect detection method and organic light-emitting display device using the same

Patent metadata

Field	Value
Publication number	US-10019950-B2
Application number	US-201615166955-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A panel defect detection method and an organic light emitting display device. A region having a high probability of a panel defect is intensively sensed through panel defect detection based on sensing results of characteristic values according to subpixels on sensing subpixel lines in an amount equal to the number of sensing subpixel lines preset in specific regions rather than all regions of a display panel. Rates and accuracy in detection of panel defects can be improved.

First claim

What is claimed is:

1. An organic light-emitting display device comprising:
a display panel in which subpixels are disposed in a matrix, each subpixel including an organic light-emitting diode and a driving transistor;
a sensing unit that senses a voltage on a sensing line and outputs a sensing value, the sensing line being electrically connected to a first node of a driving transistor in each subpixel on sensing subpixel lines corresponding to subpixel lines to be sensing-driven among a plurality of subpixel lines; and
a detection unit that detects a panel defect on the display panel based on sensing values according to the sensing subpixel lines in an amount equal to a predetermined number of sensing subpixel lines in at least one of predetermined regions in the display panel,
wherein at least two subpixels on one of the sensing subpixel lines are electrically connected to different sensing lines.

2. The organic light-emitting display device according to claim 1 , wherein the sensing unit performs a sensing processing on each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the at least one of predetermined regions according to a sequential order or a random order.

3. The organic light-emitting display device according to claim 1 , wherein the at least one of predetermined regions is at least one of an upper panel region, a lower panel region, and a central panel region.

4. The organic light-emitting display device according to claim 1 , wherein the detection unit calculates a difference value between a value obtained by adding up all sensing values according to the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines and a value obtained by multiplying the number of the sensing subpixel lines by a predetermined normal sensing value, and when the calculated difference value exceeds a predetermined threshold value, the detection unit detects that the panel defect has occurred.

5. The organic light-emitting display device according to claim 1 , further comprising a panel burning protection unit which, when the detection unit detects that the panel defect of the display panel has occurred, stores at least one of a code value or position information about defect detection based on the defect detection result, or cuts off the power of the display panel.

6. The organic light-emitting display device according to claim 1 , wherein the sensing unit performs, in a set order, a first panel region sensing processing on sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in a first panel region, a second panel region sensing processing on sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in a second panel region, and a third panel region sensing processing on sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in a third panel region, and
the detection unit performs a first panel region defect detection processing of detecting a defect in the first panel region based on a sensing value according to each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the first panel region, a second panel region defect detection processing of detecting a defect in the second panel region based on a sensing value according to each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the second panel region, and a third panel region defect detection processing of detecting a defect in the third panel region based on a sensing value according to each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the third panel region.

7. The organic light-emitting display device according to claim 6 , wherein a ratio of the sensing subpixel lines to all subpixel lines is within a range between a predetermined ratio and 100% in the first panel region and the second panel region, and
a ratio of the sensing subpixel lines to the all subpixel lines is less than the predetermined specific ratio in the third panel region.

8. The organic light-emitting display device according to claim 6 , wherein the sensing unit primarily performs one of the first panel region sensing processing and the second panel region sensing processing, secondarily performs the other, and finally performs the third panel region sensing processing.

9. The organic light-emitting display device according to claim 1 , wherein the sensing unit performs, in set order, a first panel region sensing processing on sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in a first panel region, and a second panel region sensing processing on sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in a second panel region excluding the first panel region, and
the detection unit performs a first panel region defect detection processing of detecting a defect in the first panel region based on a sensing value according to each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the first panel region, and a second panel region defect detection processing of detecting a defect in the second panel region based on a sensing value according to each of the sensing subpixel lines in an amount equal to the number of the sensing subpixel lines in the second panel region.

10. The organic light-emitting display device according to claim 9 , wherein a ratio of the sensing subpixel lines to all subpixel lines is within a range between a predetermined specific ratio and 100% in the first panel region, and
a ratio of the sensing subpixel lines to the all subpixel lines is less than the predetermined specific ratio in the second panel region.

11. The organic light-emitting display device according to claim 9 , wherein the sensing unit performs one of the first panel region sensing processing and the second panel region sensing processing, and secondarily performs the other.

12. The organic light-emitting display device according to claim 1 , further comprising a compensation unit which performs a characteristics compensation processing by detecting characteristic values of the driving transistor within each of the subpixels based on the sensing value.

13. The organic light-emitting display device according to claim 1 , wherein the sensing unit performs the sensing processing for each blank time section.

14. The organic light-emitting display device according to claim 1 , further comprising a data driver which drives a data line in the display panel,
wherein the data driver provides a recovery image data voltage to a second node of the driving transistor during a frame section after the sensing processing, and
the recovery image data voltage is a voltage in which a recovery voltage is added to an image data voltage provided to the second node of the driving transistor during a frame section before the sensing processing.

15. A panel defect detection method of an organic light-emitting display device including a display panel in which subpixels are disposed in a matrix, each subpixel including an organic light-emitting diode and a driving transistor for driving the light-emitting diode, and a data driver connected to an upper portion or a lower portion of the display panel, the panel defect detection method comprising:
performing a sensing processing of sensing characteristic values of subpixels on sensing subpixel lines in an amount equal to a predetermined number of sensing subpixel lines in at least one of

Assignees

• Lg Display Co Ltd

Inventors

• Tani Ryosuke
• Nam Woojin
• Takasugi Shinji
• Cho KyungHyun

Classifications

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G3/3283

  in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G3/3275 Primary

  Details of drivers for data electrodes · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title