Organic light emitting display and method for aging the same

Patent metadata

Field	Value
Publication number	US-9786219-B2
Application number	US-201414530975-A
Country	US
Kind code	B2
Filing date	Nov 3, 2014
Priority date	Nov 4, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An organic light emitting display panel includes a plurality of pixels, each of which includes an organic light emitting diode and each coupled to a first power voltage line. A voltage supplied to the first power voltage line in a display mode is lower than a voltage supplied to the first power voltage line in an aging mode. The display mode includes a mode in which the organic light emitting diode emits light. The aging mode includes a mode in which the organic light emitting diode does not emit light.

First claim

What is claimed is:

1. An organic light emitting display, comprising:
a first power voltage line; and
a display panel including a plurality of pixels, each of the pixels including an organic light emitting diode coupled to the first power voltage line, a driving transistor, and switches to control operation of the organic light emitting diode, at least one of the switches coupled to an anode electrode of the organic light emitting diode, wherein a first voltage supplied to the first power voltage line in a display mode is lower than a second voltage supplied to the first power voltage line in an aging mode, the first power voltage line to receive the second voltage to age the organic light emitting diode by Joule heating independently from an applied scan signal or data signal, wherein the display mode includes a mode in which the organic light emitting diode emits light and the aging mode includes a mode in which the organic light emitting diode does not emit light and the driving transistor and the switches are turned off.

2. The display as claimed in claim 1 , wherein the first power voltage line is coupled to a cathode electrode of the organic light emitting diode.

3. The display as claimed in claim 2 , further comprising:
a second power voltage line is coupled to each of the pixels,
wherein a voltage supplied to the second power voltage line in the aging mode is higher than the voltage supplied to the first power voltage line in the display mode.

4. The display as claimed in claim 3 , wherein the voltage supplied to the second power voltage line in the aging mode is substantially equal to a voltage supplied to the second power voltage line in the display mode.

5. The display as claimed in claim 3 , wherein the voltage supplied to the second power voltage line in the aging mode is substantially equal to the voltage supplied to the first power voltage line in the aging mode.

6. The display as claimed in claim 3 , further comprising:
a third power voltage line,
wherein a voltage supplied to the third power voltage line in the aging mode is substantially equal to a voltage supplied to the second power voltage line in the display mode.

7. The display as claimed in claim 6 , wherein the voltage supplied to the third power voltage line in the aging mode is substantially equal to the second voltage supplied to the first power voltage line in the aging mode.

8. The display as claimed in claim 6 , wherein the switches are switch transistors, the organic light emitting diode is to emit light based on drain-source current of the driving transistor in the display mode, and the plurality of switch transistors, which corresponding to the switches to control operation of the organic light emitting diode, are to be turned off in the aging mode.

9. A method for aging an organic light emitting display, the method comprising:
turning off a driving transistor and switches controlling operation of an organic light emitting diode in an aging mode, the switches including a switch connected to an anode electrode of the organic light emitting diode;
supplying voltages to a first power voltage line in a display mode and the aging mode, a first voltage supplied to the first power voltage line in the display mode is lower than a second voltage supplied to the first power voltage line in the aging mode; and
controlling the organic light emitting diode to not emit light during the aging mode, wherein supplying the second voltage to the first power voltage line ages the organic light emitting diode by Joule heating independently from an applied scan signal or data signal, and wherein the display mode includes a mode in which an organic light emitting diode of a pixel coupled to the first power voltage line emits light and the aging mode includes a mode in which the organic light emitting diode does not emit light.

10. The method as claimed in claim 9 , wherein the first power voltage line is coupled to a cathode electrode of the organic light emitting diode.

11. The method as claimed in claim 9 , further comprising:
supplying a voltage to a second power voltage line in the aging mode,
wherein the voltage supplied to the second power voltage line in the aging mode is higher than the voltage supplied to the first power voltage line in the display mode.

12. The method as claimed in claim 11 , further comprising:
supplying a voltage to a third power voltage line in the aging mode,
wherein the voltage supplied to the third power voltage line in the aging mode is substantially equal to a voltage supplied to the second power voltage line in the display mode.

13. An apparatus, comprising:
a timing controller; and
a power supply to supply voltages to first and second power lines coupled to a pixel, wherein the power supply is to supply first and second voltages to respective ones of the first and second power lines in a display mode and is to supply third and fourth voltages to respective ones of the first and second power lines during an aging mode for aging an organic light emitting diode in the pixel, and
wherein the timing controller is to withhold outputting at least one of a scan signal or a data signal to the pixel during the aging mode so that the pixel does not emit light during the aging mode and wherein a driving transistor and switches to control operation of the organic light emitting diode, including a switch coupled to an anode electrode of the organic light emitting diode, are off during the aging mode.

14. The apparatus as claimed in claim 13 , wherein:
the first and second voltages are different in the display mode, and
the third and fourth voltages in the aging mode are greater than at least one of the first or second voltages.

15. The apparatus as claimed in claim 14 , wherein the third voltage is substantially equal to the fourth voltage.

16. The apparatus as claimed in claim 14 , wherein:
the second voltage is greater than the first voltage, and
the third and fourth voltages are substantially equal.

17. The apparatus as claimed in claim 13 , wherein the third and fourth voltages are to generate Joule heat to age the organic light emitting diode in the pixel.

18. The apparatus as claimed in claim 13 , wherein the power supply is to supply the third and fourth voltages during a module process or a setting process of a display panel including the pixel.

19. The apparatus as claimed in claim 13 , wherein the power supply is to supply the third and fourth voltages before a scribing process and after the pixel is formed on a substrate.

20. A pixel, comprising:
a first transistor;
a driving transistor; and
an organic light emitting diode having an anode electrode coupled to the first transistor and a cathode electrode coupled to a second power line, wherein the first transistor is coupled between a first power line and the organic light emitting diode, and the organic light emitting diode is coupled between the first transistor and the second power line, wherein the driving transistor and the first transistor are is in an off state and the first and second power lines receive substantially a same voltage during an aging mode, the same voltage to generate Joule heat to age the organic light emitting diode independent from receiving a scan or data signal.

Assignees

• Samsung Display Co Ltd

Inventors

• Han Byung-Uk

Classifications

• G09G2330/028

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

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/0819

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

• G09G2310/0254

  Control of polarity reversal in general, other than for liquid crystal displays · CPC title