Pixel driver circuit and pixel circuit having the pixel driver circuit

• US 8,664,644 B2
• Filed: 04/19/2011
• Issued: 03/04/2014
• Est. Priority Date: 02/16/2001
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Nathan, Arokia, Servati, Peyman, Sakariya, Kapil, Kumar, Anil
• Primary Examiner(s): Pham, Long
• Application Number:
  US13/089,622
• Publication Number:
  US 20110193834A1
• Time in Patent Office: 1,050 Days
• Field of Search: 257/40, 257/13, 257/79
• US Class Current: 257/40
• CPC Class Codes: G09G 2300/0804 Sub-multiplexed active matrix panel, i.e. wherein one active driving circuit is used at pixel level for multiple image producing elements
• 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 2320/0204 Compensation of DC component across the pixels in flat panels
• 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 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/035 for flexible display surfaces
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3241 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 29/78648 arranged on opposing sides of the channel
• CPC Class Codes: H03K 17/162 without feedback from the output circuit to the control circuit
• CPC Class Codes: H03K 17/6871 the output circuit comprising more than one controlled field-effect transistor
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
• CPC Class Codes: H10K 19/10 comprising field-effect transistors
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A pixel driver circuit for driving a light-emitting element and a pixel circuit having the pixel driver circuit are provided. The pixel driver circuit includes a data line, address lines, switch thin film transistors, feedback thin film transistors and drive thin film transistors. The pixel circuit may include an organic light emitting diode, which is driven by the pixel driver circuit.

Claims

1. A pixel driver circuit comprising:

a light-emitting device,

an address line;

a data line;

a switch thin film transistor, a first node of the switch transistor being connected to the data line and a gate of the switch transistor being connected to the address line;

a feedback thin film transistor, a gate of the feedback transistor being connected to the address line, and a second node of the feedback transistor being connected to the data line;

a reference thin film transistor, a first node of the reference transistor being connected to the light-emitting device, a gate of the reference transistor being connected to the second node of the switch transistor, and a second node of the reference transistor being connected to a first node of the feedback transistor; and

a drive thin film transistor, a gate of the drive transistor being connected to the gate of the reference transistor, and a first node of the drive transistor being connected to a potential, and a second node of the drive transistor being connected to the light-emitting device.

2. The pixel driver circuit according to claim 1, wherein at least one of the thin film transistors is an amorphous silicon based thin film transistor.

3. The pixel driver circuit according to claim 1, wherein at least one of the thin film transistor is a polycrystalline silicon based thin film transistor.

4. The pixel driver circuit according to claim 1, wherein at least one of the thin film transistors is a n-type thin film transistor.

5. The pixel driver circuit according to claim 1, wherein at least one of the thin film transistors is a p-type thin film transistor.

6. The pixel driver circuit according to claim 1, wherein the thin film transistors each comprise a second gate.

7. The pixel driver circuit according to claim 1, wherein the first node of the reference transistor is a drain node, and wherein the second node of the reference transistor is a source node.

8. The pixel driver circuit according to claim 1, wherein the second node of the feedback transistor is connected to a ground potential.

9. The pixel driver circuit according to claim 1, wherein the second node of the feedback transistor is connected to a voltage supply.

10. The pixel driver circuit according to claim 1, comprising a capacitor connected to the gate of the drive transistor and a ground potential.

11. The pixel driver circuit according to claim 1, comprising a capacitor connected to the gate of the drive transistor and a voltage supply.

12. A pixel circuit comprising a pixel driver circuit according to claim 1;

and

an organic light emitting diode, the one of a first node and a second node of the drive transistor being connected to the organic light emitting diode.

13. The pixel circuit according to claim 12, wherein the one of the first node and the second node of the drive transistor is connected to the organic light emitting diode, and wherein the other node is connected to a ground potential.

14. The pixel circuit according to claim 12, wherein the one of the first node and the second node of the drive transistor is connected to the organic light emitting diode, and wherein the other node is connected to a voltage supply.

15. The pixel circuit according to claim 12, wherein the one of the first node and the second node of the drive transistor is a drain, and wherein the other is a source.

16. The pixel circuit according to claim 12, comprising a capacitor connected between the gate of the drive transistor and a ground potential.

17. The pixel circuit according to claim 12, comprising a capacitor connected between the gate of the drive transistor and a voltage supply.

18. The pixel circuit according to claim 12, wherein the pixel circuit is arranged for a monochrome display.

19. The pixel circuit according to claim 12, wherein the pixel circuit is arranged for a full color display.