Claims
- 1. A circuit for driving an organic light emitting diode (OLED), comprising:
a current source for providing current to a first terminal of said OLED; and a generator for providing a variable voltage signal to a second terminal of said OLED to facilitate control of said current.
- 2. The circuit of claim 1, wherein said variable voltage signal comprises:
a voltage level to turn off said OLED; a voltage level to set said drive current for said OLED; and a voltage level to allow luminance of said OLED.
- 3. The circuit of claim 1, wherein said current source comprises:
a current drive transistor for providing said current to said first terminal; a capacitor for storing a preset voltage and a data voltage, to control said current drive transistor, wherein said capacitor is connected to said first terminal; and a data transistor for adding said data voltage onto said capacitor.
- 4. A circuit for driving an organic light emitting diode (OLED), comprising:
a current drive transistor for providing current to a first terminal of said OLED; a capacitor for storing a preset voltage and a data voltage to control said current drive transistor, wherein said capacitor is connected to said first terminal; a data transistor for adding said data voltage onto said capacitor; and a generator for providing a variable voltage signal to a second terminal of said OLED to facilitate said control of said current drive transistor.
- 5. The circuit of claim 4, wherein said current is substantially independent of a threshold voltage of said current drive transistor.
- 6. The circuit of claim 4, wherein said preset voltage and said data voltage are referenced to a data reference voltage.
- 7. The circuit of claim 6, further comprising a data reference voltage transistor for establishing said data reference voltage.
- 8. The circuit of claim 7, wherein a preset signal controls operation of said data reference voltage transistor.
- 9. The circuit of claim 7,
wherein said circuit is a member of a plurality of circuits in an array of rows and columns, and wherein said preset signal is provided to said plurality of circuits.
- 10. The circuit of claim 7,
wherein said circuit is in a row of an array that contains a plurality of such circuits, and wherein said preset signal is provided from a gate line signal that is used by another row in said array.
- 11. The circuit of claim 4, wherein said generator facilitates said storing of said preset voltage and said data voltage.
- 12. The circuit of claim 4, wherein said OLED has a capacitance that facilitates said storing of said preset voltage and said data voltage.
- 13. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for turning off said OLED.
- 14. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for facilitating said storing of said preset voltage.
- 15. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for facilitating said storing of said data voltage.
- 16. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for allowing luminance of said OLED.
- 17. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for reversing a voltage polarity across said OLED.
- 18. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for reversing a source to drain voltage polarity of said current drive transistor.
- 19. The circuit of claim 4, wherein said variable voltage signal comprises a voltage level for reversing a gate to drain voltage polarity of said current drive transistor.
- 20. The circuit of claim 4, wherein said current drive transistor and said data transistor are amorphous silicon transistors.
- 21. A method for driving an organic light emitting diode (OLED), comprising:
providing a current to a first terminal of said OLED; and applying a variable voltage signal to a second terminal of said OLED to facilitate control of said current.
- 22. The method of claim 21, wherein said providing a current comprises storing a preset voltage and a data voltage to control a transistor that provides said current.
- 23. A method for driving an organic light emitting diode (OLED), comprising:
applying a voltage level to a terminal of said OLED to turn off said OLED; applying a voltage level to said terminal to set a drive current for said OLED; and applying a voltage level to said terminal to allow luminance of said OLED.
- 24. The method of claim 23, further comprising converting a voltage into said drive current.
- 25. The method of claim 24, wherein said voltage comprises a data voltage added to a preset voltage.
- 26. The method of claim 24,
wherein said converting is performed by a transistor, and wherein said drive current is independent of a threshold voltage of said transistor.
- 27. The method of claim 26, further comprising applying a voltage level to said terminal to reverse a gate to drain terminal voltage polarity of said transistor.
- 28. The method of claim 26, further comprising applying a voltage level to said terminal to reverse s a source to drain terminal voltage polarity of said transistor.
- 29. The method of claim 23, further comprising applying a voltage level to said terminal to reverse a voltage polarity across said OLED.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is claiming priority of U.S. Provisional Patent Application Serial No. 60/331,913, filed on Nov. 20, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60331913 |
Nov 2001 |
US |