Organic light emitting display and driving method thereof

Patent metadata

Field	Value
Publication number	US-9870734-B2
Application number	US-201414539948-A
Country	US
Kind code	B2
Filing date	Nov 12, 2014
Priority date	Nov 13, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

An organic light emitting display includes pixels, a scan driver configured to supply a scan signal to a specific scan line during a third period of the sensing frame, and configured to sequentially supply scan signals to the scan lines during a sixth period of the sensing frame, a data driver configured to supply, to the data lines, a previous data signal corresponding to a gray scale according to the scan signal supplied to the specific scan line during the third period, and configured to supply a current data signal to the data lines to be synchronized with the scan signals supplied during the sixth period, and a compensation unit configured to extract the threshold voltage and mobility information of the driving transistor from pixels at a specific horizontal line and coupled to the specific scan line before the scan signal is supplied during the third period.

First claim

What is claimed is:

1. An organic light emitting display configured to be driven using a plurality of sensing frames for extracting threshold voltage and mobility information of driving transistors included in pixels, the organic light emitting display comprising:
the pixels at areas defined by scan lines and data lines;
a scan driver configured to supply a scan signal to a specific scan line of the scan lines during a third period of a sensing frame of the sensing frames, and configured to sequentially supply scan signals to the scan lines during a sixth period of the sensing frame;
a data driver configured to supply, to the data lines, a previous data signal corresponding to a gray scale according to the scan signal supplied to the specific scan line during the third period, and configured to supply a current data signal to the data lines to be synchronized with the scan signals supplied to the scan lines during the sixth period; and
a compensator configured to extract the threshold voltage and mobility information of the driving transistors from ones of the pixels at a specific horizontal line and coupled to the specific scan line before any signals are supplied to the specific scan line during the third period.

2. The organic light emitting display of claim 1 , wherein the previous data signal comprises a data signal in a previous frame, and the current data signal comprises a data signal in a current frame.

3. The organic light emitting display of claim 1 , wherein the data driver is configured to supply a specific data signal to other ones of the pixels at another specific horizontal line during the sixth period so that the threshold voltage and mobility information of the driving transistors of the other ones of the pixels is extracted during a third period of a subsequent sensing frame.

4. The organic light emitting display of claim 3 , wherein the ones of the pixels at the specific horizontal line are configured to receive a specific data signal during a sixth period in a previous sensing frame.

5. An organic light emitting display configured to be driven using a plurality of sensing frames for extracting threshold voltage and mobility information of driving transistors included in pixels, the organic light emitting display comprising:
the pixels at areas defined by scan lines and data lines;
a scan driver configured to supply a scan signal to a specific scan line of the scan lines during a third period of a sensing frame of the sensing frames, and configured to sequentially supply scan signals to the scan lines during a sixth period of the sensing frame;
a data driver configured to supply, to the data lines, a previous data signal corresponding to a gray scale according to the scan signal supplied to the specific scan line during the third period, and configured to supply a current data signal to the data lines to be synchronized with the scan signals supplied to the scan lines during the sixth period;
a compensator configured to extract the threshold voltage and mobility information of the driving transistors from ones of the pixels at a specific horizontal line and coupled to the specific scan line before the scan signal is supplied to the specific scan line during the third period; and
a control driver configured to supply a first control signal to first control lines during a first period of the sensing frame, configured to supply the first control signal to a specific first control line during a fourth period of the sensing frame, configured to supply a second control signal to a second control line commonly coupled to the pixels during second and fifth periods of the sensing frame, and configured to supply a third control signal to a specific third control line among third control lines during the third period of the sensing frame,
wherein the scan driver is configured to supply a first emission control signal to a first emission control line commonly coupled to the pixels during the first and fifth periods of the sensing frame, and is configured to supply a second emission control signal to a second emission control line commonly coupled to the pixels during the first, second, fourth, and fifth periods of the sensing frame.

6. The organic light emitting display of claim 5 , wherein the specific third control line and the specific first control line are coupled to the ones of the pixels at the specific horizontal line.

7. The organic light emitting display of claim 5 , wherein the third control signal supplied to the specific third control line is supplied before the scan signal is supplied to the specific scan line.

8. The organic light emitting display of claim 5 , wherein ones of the pixels at an i-th (i is a natural number) horizontal line each comprises:
an organic light emitting diode;
a first driver configured to store the current data signal, and configured to supply the previous data signal;
a second driver configured to control current supplied to the organic light emitting diode according to the previous data signal; and
a third driver configured to electrically couple a corresponding data line to the second driver when the threshold voltage and mobility information of a corresponding one of the driving transistors is extracted.

9. The organic light emitting display of claim 8 , wherein the first driver comprises:
a second transistor coupled between the corresponding data line and a third node, and configured to be turned on when a scan signal is supplied to an i-th scan line;
a third transistor coupled between the third node and a second node that is coupled to the first and second drivers, and configured to be turned on when the second control signal is supplied; and
a second capacitor coupled between the third node and an initialization power source.

10. The organic light emitting display of claim 9 , wherein the second driver comprises:
the driving transistor having a first electrode coupled to the second node, and a gate electrode coupled to a first node;
a fifth transistor coupled between a second electrode of the driving transistor and the first node, and configured to be turned on when the second control signal is supplied;
a sixth transistor coupled between the first node and the initialization power source, and configured to be turned on when the first control signal is supplied to an i-th first control line;
a seventh transistor coupled between the second node and a first power source, and configured to be turned on when the first control signal is supplied to the i-th first control line;
an eighth transistor coupled between the second node and the first power source, and configured to be turned off when the second emission control signal is supplied, and configured to be turned on otherwise; and
a ninth transistor coupled between the second electrode of the driving transistor and an anode electrode of the organic light emitting diode, and configured to be turned off when the first emission control signal is supplied, and configured to be turned on otherwise.

11. The organic light emitting display of claim 10 , wherein the initialization power source is set to a voltage that is lower than that of the data signal.

12. The organic light emitting display of claim 10 , wherein the second driver further comprises a tenth transistor coupled between the anode electrode of the organic light emitting diode and the initialization power source, and configured to be turned on when the first control signal is supplied to the i-th first control line.

13. The organic light emitting display of claim 8 , wherein the third driver comprises a fourth transistor coupled between the corresponding data line and a fourth nod

Assignees

• Samsung Display Co Ltd

Inventors

• Yang Jin-Wook

Classifications

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G3/30

  using electroluminescent panels · CPC title

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title