ORGANIC LIGHT EMITTING DISPLAY

• US 20110227889A1
• Filed: 07/29/2010
• Published: 09/22/2011
• Est. Priority Date: 03/17/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Sang-Moo
• Granted Patent: US 8,947,329 B2
• Time in Patent Office: Days
• US Class Current: 345/209
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with 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 2320/0223 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 Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting display includes a scan driver for driving scan lines and emission control lines, a data driver for driving data lines, a display unit including pixels at crossing regions of scan lines and data lines, first power source lines coupled to a first power source configured to supply a first voltage and coupled to pixels in columns, horizontal power source lines extending in a direction parallel with scan lines and coupled to pixels in rows, and a second power source line coupled to the horizontal power source lines and to a second power source configured to supply the same voltage as the first power source, each of the pixels being configured to store a voltage corresponding to voltages of the second power source and a data signal and to control an amount of current that flows from the first power source in accordance with the stored voltage.

Claims

1. An organic light emitting display, comprising:

a scan driver for driving a plurality of scan lines and a plurality of emission control lines;

a data driver for driving a plurality of data lines;

a display unit including pixels at crossing regions of the scan lines and the data lines;

a plurality of first power source lines coupled to a first power source configured to supply a first voltage and coupled to the pixels in columns;

a plurality of horizontal power source lines extending in a direction parallel with the scan lines and coupled to the pixels in rows; and

a second power source line coupled to the horizontal power source lines and coupled to a second power source configured to supply the same voltage as the first power source,

wherein each of the pixels is configured to store a voltage corresponding to the voltage of the second power source and the voltage of a data signal supplied by the data driver and is configured to control an amount of current that flows from the first power source in accordance with the stored voltage.

2. The organic light emitting display as claimed in claim 1, further comprising a plurality of resistors, each of the resistors being coupled between a respective horizontal power source line of the horizontal power source lines and the second power source line.

3. The organic light emitting display as claimed in claim 1, wherein the scan driver is configured to sequentially supply a plurality of scan signals to the scan lines and to sequentially supply a plurality of emission control signals to the emission control lines.

4. The organic light emitting display as claimed in claim 3, wherein the scan driver is further configured to supply an emission control signal of the emission control signals supplied to an ith emission control line of the emission control lines to overlap with a scan signal of the scan signals supplied to an ith scan line of the scan lines.

5. The organic light emitting display as claimed in claim 3, wherein the scan driver is further configured to supply a plurality of inverted emission control signals generated by inverting the emission control signals to a plurality of inverted emission control lines extending in a direction parallel with the emission control lines.

6. The organic light emitting display as claimed in claim 5, further comprising a plurality of first switching elements, each of the first switching elements being coupled between a respective horizontal power source line of the horizontal power source lines and the second power source line.

7. The organic light emitting display as claimed in claim 6, wherein the scan driver is further configured to turn on a corresponding first switching element of the first switching elements in a period where a storage capacitor included in each of the pixels is charged and is configured to turn off the corresponding first switching element in other periods.

8. The organic light emitting display as claimed in claim 6, wherein a first switching element of the plurality of switching elements in an ith row is configured to be turned on when a corresponding inverted emission control signal of the inverted emission control signals is supplied to an ith inverted emission control line of the inverted emission control lines and is configured to be turned off when the corresponding inverted emission control signal is not supplied to the ith inverted emission control line.

9. The organic light emitting display as claimed in claim 4, wherein each of the pixels in an ith row of the rows comprises:

an organic light emitting diode (OLED);

a pixel circuit for controlling the amount of current supplied to the OLED;

a first transistor coupled between a first node, the first node being a common node between the pixel circuit and the first power source line, and an ith horizontal power source line, the first transistor being configured to be turned off when the emission control signal is supplied to the ith emission control line; and

a storage capacitor coupled between the pixel circuit and the ith horizontal power source line.

10. The organic light emitting display as claimed in claim 9, wherein the scan driver is configured to turn off the first transistor in a period where the storage capacitor is charged and to turn on the first transistor in other periods.

11. The organic light emitting display as claimed in claim 9, wherein each of the pixels in the ith row further comprises a second transistor coupled between the first node and the pixel circuit and configured to be turned off when the emission control signal is supplied to the ith emission control line.

12. The organic light emitting display as claimed in claim 9, wherein the pixel circuit comprises:

a third transistor coupled between the first node and the OLED and having a gate electrode coupled to a first terminal of the storage capacitor; and

a fourth transistor coupled between a corresponding data line of the data lines and the first terminal of the storage capacitor and configured to be turned on when the scan signal is supplied to the ith scan line.

13. The organic light emitting display as claimed in claim 1, wherein the second power source has a lower wiring line resistance than that of the horizontal power source line and that of the first power source line.

14. The organic light emitting display as claimed in claim 1, further comprising at least one third power source line coupled to the second power source and extending in a direction parallel with the data lines in the display unit region.

15. The organic light emitting display as claimed in claim 14, further comprising a plurality of second switching elements, each of the second switching elements being coupled between a corresponding horizontal power source line of the horizontal power source lines and the at least one third power source line.

16. The organic light emitting display as claimed in claim 15, wherein the second switching element of the plurality of second switching elements in an ith row of the rows is configured to be turned on when a corresponding scan signal of the scan signals is supplied to an ith scan line of the scan lines.

17. The organic light emitting display as claimed in claim 15, further comprising a plurality of third switching elements, each of the third switching elements being coupled between a corresponding horizontal power source line of the horizontal power source lines and the third power source line.

18. The organic light emitting display as claimed in claim 17, wherein the third switching element of the plurality of third switching elements in an ith row of the rows is configured to be turned on when a corresponding scan signal of the scan signals is supplied to an (i−

1)th scan line of the scan lines.