Display device

Patent metadata

Field	Value
Publication number	US-9659525-B2
Application number	US-201514737883-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Jul 8, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A display device includes a display panel, a data driver, a scan driver, and a power supply. The display panel includes power voltage lines and pixels coupled to data lines and scan lines. The data driver supplies data voltages to the data lines. The scan driver provides scan signals to the scan lines. The power supply supplies a power voltage to the power voltage lines. The display panel includes a compensation resistance coupled between s pixels and one of the power voltage lines.

First claim

What is claimed is:

1. A display device, comprising:
a display panel including power voltage lines and pixels coupled to data lines and scan lines;
a data driver to supply data voltages to the data lines;
a scan driver to provide scan signals to the scan lines; and
a power supply to supply a power voltage to the power voltage lines, wherein the display panel includes a compensation resistance coupled between s pixels and one of the power voltage lines, where s≧2, and wherein:
a point nearer to a start point of the one of the power voltage lines has a first number of the pixels coupled to the compensation resistance,
a point nearer to an end point of the power voltage line has a second number of the pixels coupled to the compensation resistance, and
the first number is greater than the second number.

2. The device as claimed in claim 1 , wherein each of the pixels includes:
a driving transistor to control current from a first electrode to a second electrode depending on a voltage of a control electrode;
a scan transistor to turn on in response to the scan signal of each of the scan lines, and to supply the data voltage of each of the data lines to the control electrode of the driving transistor;
an organic light emitting diode to emit light depending on a current controlled by the driving transistor; and
a capacitor coupled between the control electrode of the driving transistor and the first electrode.

3. The device as claimed in claim 2 , wherein the compensation resistance is coupled between the one of the power voltage lines and the first electrode of the driving transistor in each of the s pixels.

4. The device as claimed in claim 1 , wherein the s pixels are adjacent to each other in a first direction of the scan lines.

5. The device as claimed in claim 4 , wherein compensation resistances adjacent to each other in a second direction of the data lines are coupled to different ones of the power voltage lines.

6. The device as claimed in claim 1 , wherein the s pixels are adjacent to each other in a second direction of the data lines.

7. The device as claimed in claim 6 , wherein compensation resistances adjacent to each other in a first direction of the scan lines are coupled to different ones of the power voltage lines.

8. The device as claimed in claim 1 , wherein the s pixels include:
pixels adjacent to each other in a first direction of the scan lines; and
pixels adjacent to each other in a second direction of the data lines.

9. The device as claimed in claim 8 , wherein the s pixels are arranged in a substantially rectangular shape.

10. The device as claimed in claim 1 , wherein a predetermined number of compensation resistances are coupled between corresponding ones of a plurality of groups of s pixels and corresponding ones of power voltage lines, and wherein the predetermined number is less than all the compensation resistances.

11. The device as claimed in claim 10 , wherein:
compensation resistances nearer to start points of the power voltage lines are coupled between corresponding ones of the groups of s pixels and corresponding ones of the power voltage lines, and
each of the compensation resistances nearer to end points of the power voltage lines is coupled between one pixel and a corresponding one of the first power voltage lines.

12. The device as claimed in claim 1 , further comprising:
a mesh line connecting first electrodes of driving transistors of the s pixels coupled to the compensation resistance to first electrodes of driving transistors of s pixels coupled to another compensation resistance.

13. A display device, comprising:
a power line;
a first number of pixels;
a second number of pixels;
a first compensation resistance coupled between a light emitter of each of the first number of pixels and the power line; and
a second compensation resistance coupled between a light emitter of each of the second number of pixels and the power line, wherein the first compensation resistance is greater than the second compensation resistance, wherein the second compensation resistance is farther away from a start point of the power line than the first compensation resistance, and wherein the first number of pixels is different from the second number of pixels.

14. The display device as claimed in claim 13 , wherein a voltage of an output terminal of the first compensation resistance is substantially equal to a voltage of an output terminal of the second compensation resistance.

15. The display device as claimed in claim 13 , wherein the first and second numbers of pixels are in a same row.

16. The display device as claimed in claim 13 , wherein the first and second numbers of pixels are in a same column.

17. The display device as claimed in claim 13 , wherein a same current flows through the first and second compensation resistances.

18. The display device as claimed in claim 13 , wherein each of the first and second compensation resistances include at least one resistor.

Assignees

• Samsung Display Co Ltd

Inventors

• In Hai-Jung
• Kim Dong-Gyu
• Kim Jung-Bae
• Park Yong-Sung
• Chung Bo-Yong

Classifications

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2330/00

  Aspects of power supply; Aspects of display protection and defect management · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title