Organic light emitting display device and driving method therefor

Patent metadata

Field	Value
Publication number	US-10062328-B2
Application number	US-201615222582-A
Country	US
Kind code	B2
Filing date	Jul 28, 2016
Priority date	Jul 28, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

An organic light emitting display device includes: pixels including driving transistors positioned in regions divided by scan lines and data lines; a data accumulating unit arranged to accumulate first data; a first storage unit storing current and voltage change information corresponding to a degradation of an organic light emitting diode (OLED); a second storage unit storing a compensation value corresponding at least partially to channel length modulation of the driving transistors; and a timing controller programmed to carry out an altering of first data corresponding to an ith pixel so as to generate second data to be supplied to the ith pixel, the altering carried out according to: accumulation stress information for the ith pixel, the accumulation stress information corresponding to the accumulated first data and being stored in the data accumulating unit, the current and voltage change information, and a compensation value corresponding to the ith pixel.

First claim

What is claimed is:

1. An organic light emitting display device comprising:
pixels including driving transistors disposed in regions defined by scan lines and data lines;
a data accumulator arranged to accumulate first data;
a first storage storing current and voltage change information corresponding to a degradation of an organic light emitting diode;
a second storage storing a compensation value corresponding at least partially to a channel length modulation of the driving transistors; and
a timing controller altering the first data corresponding to an ith (where i is a natural number) pixel and generating second data to be supplied to the ith pixel, the altering carried out according to:
accumulation stress information for the ith pixel, the accumulation stress information corresponding to the accumulated first data and being stored in the data accumulator,
the current and voltage change information, and
the compensation value corresponding to the ith pixel.

2. The organic light emitting display device of claim 1 , wherein a value of the second data is set so as to compensate for the degradation of the organic light emitting diode included in the ith pixel.

3. The organic light emitting display device of claim 1 , further comprising: a data driver generating a data signal by using the second data to be supplied to the ith pixel, and supplying the data signal to a data line connected to the ith pixel.

4. An organic light emitting display device comprising:
pixels including driving transistors disposed in regions defined by scan lines and data lines, each of the driving transistors controlling an amount of current flowing from a first power source to a second power source by way of an organic light emitting diode;
a data accumulator arranged to accumulate first data;
a first storage storing current and voltage change information corresponding to a degradation of the organic light emitting diode;
a second storage storing output grayscale information for compensating an input grayscale for a change in a voltage of the first power source; and
a timing controller altering the first data corresponding to an ith (where i is a natural number) pixel so as to generate second data to be supplied to the ith pixel, the altering carried out according to:
accumulation stress information for the ith pixel, the accumulation stress information corresponding to the accumulated first data and being stored in the data accumulator,
the current and voltage change information, and
output grayscale information corresponding to the ith pixel.

5. The organic light emitting display device of claim 4 , wherein a value of the second data is set so as to compensate for the degradation of the organic light emitting diode included in the ith pixel.

6. The organic light emitting display device of claim 4 , wherein the input grayscale is a grayscale of the first data, and the output grayscale is a grayscale of the second data.

7. The organic light emitting display device of claim 4 , wherein the output grayscale information corresponds to two or more voltage values of the first power source.

8. The organic light emitting display device of claim 7 , wherein the timing controller
extracts degradation information for the ith pixel, the degradation information corresponding to accumulation stress information for the ith pixel,
detects a change in drain and source voltages of the driving transistor, the change in drain and source voltages corresponding to the extracted degradation information, and
extracts the output grayscale information from the second storage, the output grayscale information corresponding to the change in drain and source voltages.

9. The organic light emitting display device of claim 7 , wherein the timing controller interpolates the output grayscale information from the two or more voltage values of the first power source.

10. The organic light emitting display device of claim 4 , further comprising:
a data driver generating a data signal by using second data to be supplied to the ith pixel and supplying the data signal to a data line connected to the ith pixel.

11. A method of driving an organic light emitting display device, the method comprising:
storing current and voltage change information in a first storage, the current and voltage change information corresponding to a degradation of an organic light emitting diode;
storing compensation information in a second storage, the compensation information corresponding to channel length modulation for driving transistors of pixels of the display device;
accumulating first data in a data accumulator, the first data corresponding to one or more images to be displayed by the pixels; and
compensating first data corresponding to an ith (where i is a natural number) pixel by using accumulation stress information of the ith pixel, the current and voltage change information, and the compensation information, so as to generate second data to be supplied to the ith pixel.

12. The method of claim 11 , wherein the compensation information comprises at least one value for compensating for the channel length modulation of the driving transistors.

13. The method of claim 11 , wherein the compensation information is output grayscale information for altering an input grayscale according to a change in the voltage of a first power source.

14. The method of claim 13 , wherein the input grayscale is a grayscale of the first data, and the output grayscale is a grayscale of the second data.

15. The method of claim 13 , wherein the compensating further comprises:
generating degradation information of the ith pixel to correspond to accumulation stress information of the ith pixel,
detecting a change in drain and source voltages of the driving transistor, and
extracting output grayscale information corresponding to the change in the drain and source voltages, so as to generate the second data.

16. The method of claim 11 , wherein a value of the second data is set to compensate for the degradation of an organic light emitting diode.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Jae Hoon
• Kim Jin Woo
• Ryu Do Hyung
• Song Jae Woo
• Jung Hae Goo

Classifications

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2320/046

  Dealing with screen burn-in prevention or compensation of the effects thereof · CPC title

• G09G3/3233 Primary

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

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title