Electric apparatus having an organic electro-luminescence display

• US 7,589,718 B2
• Filed: 08/29/2005
• Issued: 09/15/2009
• Est. Priority Date: 05/13/2005
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Li, Chun-Huai, Hu, Shuo-Hsiu
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Sheng; Tom V
• Application Number:
  US11/212,569
• Publication Number:
  US 20060267882A1
• Time in Patent Office: 1,478 Days
• Field of Search: 345/76, 345/77, 345/204, 345211-215
• US Class Current: 345/211
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An electric apparatus having an OELD includes a DC-to-DC converter, an OELD and at least one executing unit. The DC-to-DC converter converts a first direct voltage into a second direct voltage. The OELD receives the first direct voltage. The executing unit receives the second direct voltage and thus executes a system function of the electric apparatus.

Claims

1. An electric apparatus, comprising:

a DC-to-DC converter for converting a first direct voltage into a second direct voltage;

at least one executing unit for receiving the second direct voltage and executing a system function of the electric apparatus; and

an OELD (Organic Electro-Luminescence Display), for receiving the first direct voltage or the second direct voltage, comprising a data driver for outputting a pixel voltage and a plurality of pixels, wherein each of the pixels comprises;

an organic electro-luminescence diode; and

a transistor having a source for receiving the first direct voltage or the second direct voltage, a gate for receiving the pixel voltage, and a drain electrically connected to the organic electro-luminescence diode, wherein;

at least one first potential difference and at least one second potential difference exist between the source and the gate of the transistor;

the at least one first potential difference is generated when the organic electro-luminescence diode has a maximum luminance, and the at least one second potential difference is generated when the organic electro-luminescence diode has a minimum luminance; and

when the first direct voltage or the second direct voltage changes, the data driver controls the pixel voltage according to a variation of the first direct voltage or a variation of the second direct voltage, such that the pixel voltage has a variation substantially the same as the variation of the first direct voltage or the variation of the second direct voltage, and the at least one first potential difference and the at least one second potential difference are substantially held constant.

2. The electric apparatus according to claim 1, wherein the first direct voltage is supplied by an external power.

3. The electric apparatus according to claim 1, wherein the OELD is a PLED (Polymer Light-Emitting Diode) display.

4. The electric apparatus according to claim 1, wherein the OELD is an OLED (Organic Light-Emitting Diode) display.

5. The electric apparatus according to claim 1, wherein the organic electro-luminescence diode has a negative terminal coupled to a low voltage, and the transistor is a P-type transistor and has the drain electrically connected to a positive terminal of the organic electro-luminescence diode.

6. The electric apparatus according to claim 1, wherein the organic electro-luminescence diode has a positive terminal coupled to a high voltage, and the transistor is an N-type transistor and has the drain electrically connected to a negative terminal of the organic electro-luminescence diode.

7. An electric apparatus, comprising:

a DC-to-DC converter for converting a first direct voltage into a second direct voltage;

at least one executing unit for receiving the second direct voltage and executing a system function of the electric apparatus;

a passive device voltage converting unit for converting the first direct voltage or the second direct voltage into a third direct voltage; and

an OELD (Organic Electro-Luminescence Display) for receiving the third direct voltage, comprising a data driver for outputting a pixel voltage and a plurality of pixels, wherein each of the pixels comprises;

an organic electro-luminescence diode; and

a transistor having a source for receiving the third direct voltage, a gate for receiving the pixel voltage, and a drain electrically connected to the organic electro-uminescence diode, wherein;

at least one first potential difference and at least one second potential difference exist between the source and the gate of the transistor;

the at least one first potential difference is generated when the organic electro-luminescence diode has a maximum luminance, and the at least one second potential difference is generated when the organic electro-luminescence diode has a minimum luminance; and

when the third direct voltage changes, the data driver controls the pixel voltage according to a variation of the third direct voltage, such that the pixel voltage has a variation substantially the same as the variation of the third direct voltage, and the at least one first potential difference and the at least one second potential difference are substantially held constant.

8. The electric apparatus according to claim 7, wherein the first direct voltage is supplied by an external power.

9. The electric apparatus according to claim 7, wherein the OELD is a PLED (Polymer Light-Emitting Diode) display.

10. The electric apparatus according to claim 7, wherein the OELD is an OLED (Organic Light-Emitting Diode) display.

11. The electric apparatus according to claim 7, wherein the organic electro-luminescence diode has a negative terminal coupled to a low voltage, and the transistor is a P-type transistor and has the drain electrically connected to a positive terminal of the organic electro-luminescence diode.

12. The electric apparatus according to claim 7, wherein the passive device voltage converting unit is a passive device.

13. The electric apparatus according to claim 7, wherein the organic electro-luminescence diode has a positive terminal coupled to a high voltage, and the transistor is an N-type transistor and has the drain electrically connected to a negative terminal of the organic electro-luminescence diode.

14. An electric apparatus, comprising:

a DC-to-DC converter for converting a first direct voltage into a second direct voltage;

at least one executing unit for receiving the second direct voltage and executing a system function of the electric apparatus; and

an OELD (Organic Electro-Luminescence Display), for receiving the first direct voltage or the second direct voltage, comprising a plurality of pixels, wherein each of the pixels comprises;

an organic electro-luminescence diode generating a rated luminance when a rated current flows through the organic electro-luminescence diode; and

a transistor having a source for receiving the first direct voltage or the second direct voltage, a gate for receiving a pixel voltage, and a drain electrically connected to the organic electro-luminescence diode, wherein;

the rated current corresponds to a rated pixel voltage;

a current flowing through the organic electro-luminescence diode is substantially equal to a current flowing through the transistor; and

when the first direct voltage or the second direct voltage changes, the transistor generates a current substantially the same as the rated current as the gate of the transistor receives the rated pixel voltage by changing a width-to-length ratio of a channel of the transistor.

15. The electric apparatus according to claim 14, wherein the first direct voltage is supplied by an external power.

16. The electric apparatus according to claim 14, wherein the OELD is a PLED (Polymer Light-Emitting Diode) display.

17. The electric apparatus according to claim 14, wherein the OELD is an OLED (Organic Light-Emitting Diode) display.

18. The electric apparatus according to claim 14, wherein the organic electro-luminescence diode has a negative terminal coupled to a low voltage, and the transistor is a P-type transistor and has the drain electrically connected to a positive terminal of the organic electro-luminescence diode.

19. The electric apparatus according to claim 14, wherein the organic electro-luminescence diode has a positive terminal coupled to a high voltage, and the transistor is a N-type transistor and has the drain electrically connected to a negative terminal of the organic electro-luminescence diode.

20. An electric apparatus, comprising:

a DC-to-DC converter for converting a first direct voltage into a second direct voltage;

at least one executing unit for receiving the second direct voltage and executing a system function of the electric apparatus;

a passive device voltage converting unit for converting the first direct voltage or the second direct voltage into a third direct voltage; and

an OELD (Organic Electro-Luminescence Display), for receiving the third direct voltage, comprising a plurality of pixels, wherein each of the pixels comprises;

an organic electro-luminescence diode generating a rated luminance when a rated current flows through the organic electro-luminescence diode; and

a transistor having a source for receiving the third direct voltage, a gate for receiving a pixel voltage, and a drain electrically connected to the organic electro-luminescence diode, wherein;

the rated current corresponds to a rated pixel voltage;

a current flowing through the organic electro-luminescence diode is substantially equal to a current flowing through the transistor; and

when the third direct voltage changes, the transistor generates a current substantially the same as the rated current as the gate of the transistor receives the rated pixel voltage by changing a width-to-length ratio of a channel of the transistor.

21. The electric apparatus according to claim 20, wherein the first direct voltage is supplied by an external power.

22. The electric apparatus according to claim 20, wherein the OELD is a PLED (Polymer Light-Emitting Diode) display.

23. The electric apparatus according to claim 20, wherein the OELD is an OLED (Organic Light-Emitting Diode) display.

24. The electric apparatus according to claim 20, wherein the organic electro-luminescence diode has a negative terminal coupled to a low voltage, and the transistor is a P-type transistor and has the drain electrically connected to a positive terminal of the organic electro-luminescence diode.

25. The electric apparatus according to claim 20, wherein the passive device voltage converting unit is a passive device.

26. The electric apparatus according to claim 20, wherein the organic electro-luminescence diode has a positive terminal coupled to a high voltage, and the transistor is a N-type transistor and has the drain electrically connected to a negative terminal of the organic electro-luminescence diode.