Organic light emitting diode display and method of driving the same

Patent metadata

Field	Value
Publication number	US-9257069-B2
Application number	US-201314108483-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Apr 17, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A controller for a display panel may include a first supply circuit to output first and second driving voltages to a sub-pixel of a first color; and a second supply circuit to output third and fourth driving voltages to a sub-pixel of a second color. The first driving voltage may be greater than the second driving voltage, and the third driving voltage may be greater than the fourth driving voltage. Also, at least three of the first, second, third, and fourth driving voltages may be different from one another.

First claim

What is claimed is:

1. An organic light emitting diode (OLED) display, comprising:
a plurality of pixels, each including sub-pixels of different colors;
a plurality of voltage supply lines to supply driving power source voltages to the sub-pixels;
a signal controller to determine the driving power source voltages and to generate a voltage supply control signal including information indicative of the driving power source voltages; and
a voltage supply to generate the driving power source voltages based on the voltage supply control signal and to transfer the driving power source voltages to the plurality of voltage supply lines, wherein the voltage supply is to generate different driving power source voltages for different ones of the sub-pixels, wherein anodes of OLEDs in at least two of the sub-pixels are to receive different ones of the driving power source voltages and cathodes of the OLEDs in at least two of the sub-pixels are to receive different ones of the driving power source voltages.

2. The display as claimed in claim 1 , wherein the sub-pixels emit light of different primary colors.

3. The display as claimed in claim 1 , wherein the plurality of voltage supply lines include:
a first voltage supply line to transfer a first driving power source voltage,
a second voltage supply line to transfer a second driving power source voltage,
a third voltage supply line to transfer a third driving power source voltage, and
a fourth voltage supply line to transmit a fourth driving power source voltage,
wherein the first and second power source driving voltages are greater than the third and fourth driving voltages.

4. The display as claimed in claim 3 , wherein the first driving power source voltage, the second driving power source voltage, the third driving power source voltage, and the fourth driving power source voltage have different magnitudes.

5. The display as claimed in claim 3 , wherein the first and second driving power source voltages are different.

6. The display as claimed in claim 3 , wherein the third and fourth driving power source voltages are different.

7. The display as claimed in claim 3 , wherein the third driving power source voltage or the fourth driving voltage is substantially a ground voltage.

8. The display as claimed in claim 1 , wherein the voltage supply comprises a plurality of DC-DC converters to generate the driving power source voltages.

9. The display as claimed in claim 1 , wherein:
each sub-pixel receives two driving power source voltages, and
the driving power source voltages received by a first one of the sub-pixels of a first color are different from the driving power source voltages received by a second one of the sub-pixels of a second color.

10. The display as claimed in claim 1 , wherein:
the at least three sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel,
the plurality of voltage supply lines include a first voltage supply line to transfer a first driving power source voltage, a second voltage supply line to transfer a second driving power source voltage, a third voltage supply line to transfer a third driving power source voltage, and a fourth voltage supply line to transfer a fourth driving power source voltage,
the first sub-pixel and the second sub-pixel are connected to the first voltage supply line,
the third sub-pixel is connected to the second voltage supply line,
the first sub-pixel is connected to the third voltage supply line, and
the second sub-pixel and the third sub-pixel are connected to the fourth voltage supply line.

11. The display as claimed in claim 10 , wherein:
one electrode of a driving transistor of the first sub-pixel and one electrode of a driving transistor of the second sub-pixel are connected to the first voltage supply line in common, and
one electrode of a driving transistor of the third sub-pixel is connected to the second voltage supply line.

12. The OLED display as claimed in claim 10 , wherein:
one electrode of an organic light emitting diode (OLED) included in the first sub-pixel is connected to the third voltage supply line, and
one electrode of an OLED included the second sub-pixel and one electrode of an OLED included in the third sub-pixel are connected to the fourth voltage supply line in common.

13. The display as claimed in claim 10 , wherein:
the first driving power source voltage includes a driving voltage of a color displayed by the second sub-pixel,
the second driving power source voltage includes a driving voltage of a color displayed by the third sub-pixel,
the third driving power source voltage includes a voltage obtained by subtracting a driving voltage of a color displayed by the first sub-pixel from the first voltage, and
the fourth driving power source voltage includes a ground voltage.

14. The display as claimed in claim 10 , wherein:
the first driving power source voltage includes a driving voltage of a color displayed by the first sub-pixel,
the fourth driving power source voltage includes a voltage obtained by subtracting a driving voltage of a color displayed by the second sub-pixel from the first voltage,
the third driving power source voltage includes a ground voltage, and
the second driving power source voltage includes a voltage obtained by adding the fourth voltage to a driving voltage of a color displayed by the third sub-pixel.

15. The display as claimed in claim 10 , wherein the first driving power source voltage or the second driving power source voltage is determined as one of driving voltages for driving an organic light emitting element displaying a first color, a second color, and a third color.

16. A method of driving an organic light emitting diode (OLED) display, the method comprising:
calculating driving power source voltages for different color sub-pixels;
generating a control signal including information indicative of the calculated driving power source voltages;
generating the driving power source voltages based on the voltage supply control signal; and
supplying the generated driving power source voltages to voltage supply lines connected to the sub-pixels, wherein different power source voltages are supplied to the different color sub-pixels, different ones of the driving power source voltages to be supplied to anodes of OLEDs in at least two of the sub-pixels and different ones of the driving power source voltages to be supplied to cathodes of the OLEDs in at least two of the sub-pixels.

17. The method as claimed in claim 16 , wherein:
first and second driving power source voltages are supplied to voltage supply lines connected to a sub-pixel of a first color, and
third and fourth driving power source voltages are supplied to voltage supply lines connected to a sub-pixel of a second color, wherein the first, second, third, and fourth driving power source voltages are different from one another.

18. The method as claimed in claim 17 , wherein the third driving power source voltage or the fourth driving power source voltage is substantially a ground voltage.

19. A voltage supply for a display panel, the voltage supply comprising:
a first supply circuit to output first and second driving voltages to a sub-pixel of a first color, the first driving voltage to be output to a first electrode of a light emitter of the sub-pixel of the first color and the second driving voltage to be output to a second electrode of the light emitter of the sub-pixel of the first color; and
a second supply circuit to output third and fourth driving voltages t

Assignees

• Samsung Display Co Ltd

Inventors

• Kaplan Leonid
• Na Heung-Yeol
• Chung Ho-Ryun
• Lee Wang-Jo
• Lee Jang-Doo

Classifications

• G09G3/3208 Primary

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

• G09G2330/028

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

• G09G3/30 Primary

  using electroluminescent panels · CPC title