Systems and methods for adjusting display parameters of an active matrix organic light emitting diode panel

• US 8,525,762 B2
• Filed: 11/16/2006
• Issued: 09/03/2013
• Est. Priority Date: 11/16/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Chang, Ting-Kuo, Lin, Ching-Wei
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US11/600,962
• Publication Number:
  US 20080117142A1
• Time in Patent Office: 2,483 Days
• Field of Search: 345 76- 86, 345204-211, 348/690, 348/223, 348/655
• US Class Current: 345/82
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 3/3225 using an active matrix

Abstract

Systems and methods for adjusting display parameters of an active matrix organic light emitting diode (AMOLED) panel are provided. The method includes obtaining optimum display parameters for subpixels of the AMOLED panel, storing the optimum display parameters in a non-volatile memory, loading the optimum display parameters stored in the non-volatile memory into a static register memory during normal operation of the AMOLED panel, and utilizing the optimum display parameters loaded in the static register memory to drive the AMOLED panel to have optimum color properties while displaying image data.

Claims

1. A method of adjusting white point display parameters of an active matrix organic light emitting diode (AMOLED) panel, the method comprising:

obtaining an adjusted Gamma curve for all subpixels of all pixels of the AMOLED panel, wherein the adjusted Gamma curve for the subpixels of all pixels of the AMOLED panel is determined according to a white-point adjustment;

storing the adjusted Gamma curve in a non-volatile memory;

controlling a switch enable register to operate a first switch to load the adjusted Gamma curve for the subpixels of pixels of the AMOLED panel into the non-volatile memory, and upon completion of loading the adjusted Gamma curve for the subpixels of pixels of the AMOLED panel into the non-volatile memory, operating a second switch in order to load the adjusted Gamma curve stored in the non-volatile memory into a static register memory during normal operation of the AMOLED panel, the second switch having a first end directly connected to the non-volatile memory and a second end directly connected to the static register memory; and

utilizing the adjusted Gamma curve loaded in the static register memory to drive the AMOLED panel to have optimum color properties while displaying image data.

2. The method of claim 1, wherein obtaining the adjusted Gamma curve for subpixels of the AMOLED panel comprises:

measuring subpixel color coordinates for sample subpixels of the AMOLED panel; and

adjusting the brightness of the sample subpixels according to the measured color coordinate information of subpixels to achieve an optimum white-point for each pixel of the AMOLED panel.

3. The method of claim 2, wherein adjusting the brightness of sample subpixels comprises shifting red-green-blue (RGB) gamma curves using a predetermined offset value for all gray levels of the pixels of the AMOLED panel.

4. The method of claim 2, wherein adjusting the brightness of sample subpixels comprises adjusting the slope of red-green-blue (RGB) gamma curves for pixels of the AMOLED panel.

5. The method of claim 1, wherein the non-volatile memory is an erasable programmable read-only memory (EPROM).

6. The method of claim 1, wherein the non-volatile memory is an electrically erasable programmable read-only memory (EEPROM).

7. The method of claim 1, wherein the non-volatile memory is a flash memory.

8. The method of claim 1, wherein the non-volatile memory is a one-time programmable (OTP) memory.

9. The method of claim 1, wherein utilizing the adjusted Gamma curve loaded in the static register memory to drive the AMOLED panel to have optimum color properties while displaying image data comprises directly utilizing the adjusted Gamma curve to drive the AMOLED panel without altering the adjusted Gamma curve.

10. A system for adjusting display parameters of an active matrix organic light emitting diode (AMOLED) display, comprising:

an AMOLED panel comprising a plurality of pixels, each pixel comprising a plurality of subpixels;

a non-volatile memory for storing an adjusted Gamma curve for the subpixels of the AMOLED panel, wherein the adjusted Gamma curve for the subpixels of the AMOLED panel are determined according to a white-point adjustment;

a static register memory for loading the adjusted Gamma curve stored in the non-volatile memory during normal operation of the AMOLED panel;

a switch enable register for operating a first switch to load the adjusted Gamma curve for subpixels of the AMOLED panel into the non-volatile memory, and upon completion of loading the adjusted Gamma curve for subpixels of the AMOLED panel into the non-volatile memory, operating a second switch in order to load the adjusted Gamma curve from the non-volatile memory to the static register memory, the second switch having a first end directly connected to the non-volatile memory and a second end directly connected to the static register memory; and

a source driver for utilizing the adjusted Gamma curve loaded in the static register memory to drive the AMOLED panel to have optimum color properties while displaying image data.

11. The system of claim 10, wherein the non-volatile memory is an erasable programmable read-only memory (EPROM).

12. The system of claim 10, wherein the non-volatile memory is an electrically erasable programmable read-only memory (EEPROM).

13. The system of claim 10, wherein the non-volatile memory is a flash memory.

14. The system of claim 10, wherein the non-volatile memory is a one-time programmable (OTP) memory.

15. The system of claim 10, wherein the non-volatile memory is integrated in the source driver.

16. The system of claim 10, wherein the source driver directly utilizes the adjusted Gamma curve to drive the AMOLED panel without altering the adjusted Gamma curve.