ORGANIC LIGHT EMITTING DISPLAY

• US 20110193885A1
• Filed: 04/16/2010
• Published: 08/11/2011
• Est. Priority Date: 02/08/2010
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: LEE, Kyung Ho, Kwon, Kyoung Soo
• Application Number:
  US12/761,877
• Publication Number:
  US 20110193885A1
• Time in Patent Office: Days
• US Class Current: 345/690
• 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 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

Disclosed herein is an organic light emitting display. The organic light emitting display is configured to include: a first transistor that receives a data signal from a data line in response to a scan signal from a scan signal line; a first capacitor that is charged with voltage corresponding to the data signal; a driving transistor that controls driving current supplied from a first power supply by corresponding to a voltage value charged in the first capacitor; a second transistor that connects or blocks the driving current transmitted through the driving transistor in response to an emission control signal from an emission control line; an organic light emitting diode that is connected between the second transistor and a second power supply and generates light corresponding to the driving current supplied from the driving transistor; and a reverse bias voltage applying module that reverses the polarity of the voltage supplied to the driving transistor simultaneously with applying reverse bias voltage to the organic light emitting diode in response to a reverse bias applying signal.

Claims

1. An organic light emitting display, comprising:

a first transistor that receives a data signal from a data line in response to a scan signal from a scan signal line;

a first capacitor that is charged with voltage corresponding to the data signal;

a driving transistor that controls driving current supplied from a first power supply by corresponding to a voltage value charged in the first capacitor;

a second transistor that connects or blocks the driving current transmitted through the driving transistor in response to an emission control signal from an emission control line;

an organic light emitting diode that is connected between the second transistor and a second power supply and generates light corresponding to the driving current supplied from the driving transistor; and

a reverse bias voltage applying module that reverses the polarity of the voltage supplied to the driving transistor simultaneously with applying reverse bias voltage to the organic light emitting diode in response to a reverse bias applying signal.

2. The organic light emitting display according to claim 1, wherein a first electrode of the first transistor is connected to the data line and a second electrode of the first transistor is connected to one terminal of the first capacitor and a control electrode of the driving transistor, and a control electrode of the first transistor is connected to the scan signal line.

3. The organic light emitting display according to claim 2, wherein a first electrode of the driving transistor is connected to the first power supply and the other terminal of the first capacitor, and a second electrode of the driving transistor is connected to a first electrode of the second transistor.

4. The organic light emitting display according to claim 3, wherein a second electrode of the second transistor is connected to one terminal of the organic light emitting diode, and a control electrode of the second transistor is connected to the emission control line.

5. The organic light emitting display according to claim 4, wherein the reverse bias voltage applying module includes:

a first switch that is connected between the other terminal of the first capacitor and the first electrode of the driving transistor to connect or block a connection between the first capacitor and the first electrode of the driving transistor;

a second capacitor of which one terminal is connected to the other terminal of the first transistor;

a second switch that is connected between the other terminal of the second capacitor and the second electrode of the driving transistor to connect or block a connection between the second capacitor and the second electrode of the driving transistor;

a third switch that is connected between the second electrode of the driving transistor and the first power supply to connect or block the supply of the first power supply voltage to the second electrode of the driving transistor; and

a fourth switch that is connected between a reverse bias power supply and one terminal of the organic light emitting diode to connect or block the reverse bias voltage applied to the organic light emitting diode.

6. The organic light emitting display according to claim 5, wherein when the reverse bias applying signal is applied to the reverse bias voltage applying module, the first switch is turned off and the second to fourth switches are turned on.

7. The organic light emitting display according to claim 6, wherein when the reverse bias applying signal is applied to the reverse bias voltage applying module, second power is supplied to the first electrode of the driving transistor and first power is supplied to the other terminal of the organic light emitting diode.

8. The organic light emitting display according to claim 5, wherein when the reverse bias applying signal is not applied to the reverse bias voltage applying module, the first switch is turned on and the second to fourth switches are turned off.

9. The organic light emitting display according to claim 5, wherein the reverse bias applying signal is applied in a section where the organic light emitting diode is not light-emitted.

10. The organic light emitting display according to claim 5, wherein the second capacitor has the same capacity as the first capacitor.

11. The organic light emitting display according to claim 4, wherein the reverse bias voltage applying module includes:

a first switch that is connected between the other terminal of the first capacitor and the first electrode of the driving transistor to connect or block a connection between the first capacitor and the first electrode of the driving transistor;

a second switch that is connected between the other terminal of the first capacitor and the second electrode of the driving transistor to connect or block a connection between the first capacitor and the second electrode of the driving transistor;

a third switch that is connected between the second electrode of the driving transistor and the first power supply voltage line to connect or block the supply of the first power supply voltage to the second electrode of the driving transistor; and

a fourth switch that is connected between a reverse bias power supply voltage line and one terminal of the organic light emitting diode to connect or block the reverse bias voltage applied to the organic light emitting diode.

12. The organic light emitting display according to claim 11, wherein when the reverse bias applying signal is applied to the reverse bias voltage applying module, the first switch is turned off and the second to fourth switches are turned on.

13. The organic light emitting display according to claim 12, wherein when the reverse bias applying signal is applied to the reverse bias voltage applying module, second power is supplied to the first electrode of the driving transistor and first power is supplied to the other terminal of the organic light emitting diode.

14. The organic light emitting display according to claim 11, wherein when the reverse bias applying signal is not applied to the reverse bias voltage applying module, the first switch is turned on and the second to fourth switches are turned off.

15. The organic light emitting display according to claim 11, wherein when the reverse bias applying signal is applied in a section where the organic light emitting diode is not light-emitted.