Organic light emitting display device

• US 8,665,249 B2
• Filed: 07/08/2009
• Issued: 03/04/2014
• Est. Priority Date: 07/23/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Suh, Mi-Sook
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): XAVIER, ANTONIO J
• Application Number:
  US12/499,224
• Publication Number:
  US 20100020059A1
• Time in Patent Office: 1,700 Days
• Field of Search: None
• US Class Current: 345/204
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting display device capable of ensuring the drive stability. The organic light emitting display includes a plurality of pixels; first signal supply lines respectively coupled to the pixels disposed in at least two horizontal lines; and second signal supply lines being lower in number than the first signal supply lines and respectively coupled to the pixels disposed in the horizontal lines includes a scan driver driving the first and second signal supply lines; a data driver driving data lines disposed in a direction that is crossed to the first and second signal supply lines; and a dummy pattern block providing dummy patterns so that loads of the second signal supply lines are identical to loads of the first signal supply lines.

Claims

1. An organic light emitting display device comprising:

a plurality of pixels arranged in a plurality of rows and a plurality of columns;

first signal supply lines, each of the first signal supply lines being coupled to at least two rows of pixels from among the plurality of rows of pixels;

second signal supply lines each being coupled to a fewer number of rows of pixels from among the plurality of rows of pixels than the number of rows of pixels each first signal supply line is coupled to;

a scan driver for driving the first signal supply lines and second signal supply lines;

a data driver for driving data lines disposed in a direction that crosses the first signal supply lines and second signal supply lines; and

a dummy pattern block for providing a parasitic capacitance to each of the second signal supply lines so that a total parasitic capacitance of each of the second signal supply lines is substantially identical to a total parasitic capacitance of each of the first signal supply lines,

wherein each of the second signal supply lines is coupled to at least one row of pixels.

2. The organic light emitting display device according to claim 1, wherein a length of the dummy pattern block is a shorter length than a parallel length of the pixels.

3. The organic light emitting display device according to claim 1, wherein the dummy patterns are made of a metal material that is different from a metal material of the second signal supply lines.

4. The organic light emitting display device according to claim 3, wherein the second signal supply lines are made of a gate metal, and the dummy pattern is formed of one of a source metal, a drain metal or a semiconductor layer.

5. The organic light emitting display device according to claim 1, wherein the dummy patterns are electrically coupled to at least one constant voltage source supplied to the organic light emitting display device.

6. The organic light emitting display device according to claim 1, wherein the dummy patterns are overlapped with the second signal supply lines so that parasitic capacitance of the second signal supply lines is approximately identical to parasitic capacitance of the first signal supply lines.

7. The organic light emitting display device according to claim 1, wherein the dummy pattern block is disposed in at least one region of an upper portion and a lower portion of a panel except for an active region.

8. The organic light emitting display device according to claim 1, wherein:

at least a portion of each of the second signal supply lines coupled to the pixels is at an active region, and

at least a portion of each of the second signal supply lines coupled to the dummy pattern block is outside of the active region.

9. The organic light emitting display device according to claim 1, wherein:

the dummy pattern block overlaps at least one second signal supply line of the second signal supply lines for a first length in a horizontal direction of the at least one second signal supply line,

one of the pixels overlaps the at least one second signal supply line for a second length in the horizontal direction of the at least one second signal supply line, and

the first length is greater than the second length.

10. The organic light emitting display device according to claim 1, wherein:

the dummy pattern block has an outer maximum width in a direction parallel to the horizontal lines,

each of the pixels has an outer maximum width in a direction parallel to the horizontal lines, and

the outer maximum width of each of the pixels is less than the outer maximum width of the dummy pattern block.

11. The organic light emitting display device according to claim 1,

wherein each of the first signal supply lines is coupled to at least three rows of pixels from among the plurality of rows of pixels,

and wherein each of the second signal supply lines is coupled to at least two rows of pixels from among the plurality of rows of pixels.

12. The organic light emitting display device according to claim 1, wherein an organic light emitting diode and the like are not formed inside the dummy pattern block.

13. A method of stably driving an organic light emitting display device comprising a plurality of pixels arranged in a plurality of rows and a plurality of columns;

first signal supply lines, each of the first signal supply lines being coupled to at least two rows of pixels from among the plurality of rows of pixels;

second signal supply lines each being coupled to a fewer number of rows of pixels from among the plurality of rows of pixels than the number of rows of pixels each first signal supply line is coupled to, wherein each of the second signal supply lines is coupled to at least one row of pixels;

the method of stably driving the organic light emitting display device comprising;

driving the first signal supply lines and second signal supply lines with a scan driver;

driving data lines with a data driver, wherein the data lines are disposed across the first signal supply lines and second signal lines; and

supplying a parasitic capacitance to each of the second signal supply lines to provide a substantially equal parasitic capacitance to each of the first signal supply lines and the second signal supply lines to stably drive the plurality of pixels.

14. The method of claim 13, wherein the providing of the equal parasitic capacitance comprises a dummy pattern block providing a dummy pattern so that loads of the first signal supply lines and loads of the second signal supply lines are identical.

15. The method of claim 14, wherein the dummy pattern block comprises a length of the dummy pattern block being shorter than a parallel length of the pixels.

16. The method of claim 14, wherein the dummy patterns are made of a metal material that is different from a metal material of the second signal supply lines.

17. The method of claim 16, wherein the second signal supply lines are made of a gate metal, and the dummy pattern is formed of one of a source metal, a drain metal or a semiconductor layer.

18. The method of claim 14, wherein the dummy patterns are electrically coupled to at least one constant voltage source supplied to the organic light emitting display device.

19. The method of claim 14, wherein the dummy patterns are overlapped with the second signal supply lines so that parasitic capacitance of the second signal supply lines can be identical to parasitic capacitance of the first signal supply lines.

20. The method of claim 14, wherein the dummy pattern block is disposed in at least one region of an upper portion and a lower portion of a panel except for an active region.