Display control system of a display panel and control method thereof

• US 7,609,239 B2
• Filed: 10/23/2006
• Issued: 10/27/2009
• Est. Priority Date: 03/16/2006
• Status: Active Grant

• Current Assignee: Princeton Technology Corporation
• Original Assignee: Princeton Technology Corporation
• Inventors: Chang, Hwa-Hsiang
• Primary Examiner(s): TRAN, MY CHAU T
• Application Number:
  US11/552,138
• Publication Number:
  US 20070216611A1
• Time in Patent Office: 1,100 Days
• Field of Search: 345/55, 345/76, 345/78, 345/82, 345/83, 345/84, 345/204, 345/690
• US Class Current: 345/82
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• 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 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

When electric current is provided to a scan line of a display panel, electric current flowing from an initial end to a final end of the scan line is gradually reduced because of resistance consumption, resulting in lower brightness on both left and right sides of the display panel. Therefore, data line driving signals provided to the display panel are compensated for solving such a problem.

Claims

1. A display control system of a display panel, the display control system comprising:

an image control circuit for generating a data signal and a scan signal;

a compensation circuit coupled to the image control circuit for generating a compensation signal according to the distribution and magnitude of currents flowing through scan lines of the display panel; and

a driver circuit coupled to the image control circuit and the compensation circuit for outputting data line driving signals to data lines of the display panel according to the compensation signal and the data signal and for outputting scan line driving signals to the scan lines of the display panel according to the scan signal to drive the display panel to display images.

2. The display control system of claim 1 further comprising a current meter coupled between the display panel and the image control circuit for measuring the distribution and the magnitude of the currents flowing through the scan lines of the display panel.

3. The display control system of claim 1 wherein the display panel is an organic light emitting diode (OLED) display panel.

4. A flat display comprising:

a display panel for displaying images; and

a display control system comprising;

an image control circuit coupled to the display panel for generating a data signal and a scan signal;

a compensation circuit coupled to the image control circuit for generating a compensation signal according to the distribution and magnitude of currents flowing through scan lines of the display panel; and

a driver circuit coupled to the display panel, the image control circuit, and the compensation circuit for outputting data line driving signals to data lines of the display panel according to the compensation signal and the data signal and for outputting scan line driving signals to the scan lines of the display panel according to the scan signal to drive the display panel to display images.

5. The flat display of claim 4 further comprising a current meter coupled between the display panel and the image control circuit for measuring the distribution and the magnitude of the currents flowing through the scan lines of the display panel.

6. The flat display of claim 4 wherein the display panel is an organic light emitting diode (OLED) display panel.

7. A display control system of a display matrix, the display control system comprising:

an image control circuit for generating a data signal and a scan signal;

a compensation circuit for generating a compensation signal according to a predetermined look-up table, wherein the look-up table is generated according to the distribution and the magnitude of currents flowing through the scan lines of the display matrix; and

a driver circuit coupled to the image control circuit and the compensation circuit for outputting data line driving signals to data lines of the display matrix according to the compensation signal and the data signal and for outputting scan line driving signals to scan lines of the display matrix according to the scan signal to drive the display matrix to display images.

8. The display control system of claim 7 wherein the display matrix is an organic light emitting diode (OLED) matrix.

9. A flat display comprising:

a display panel for displaying images; and

a display control system comprising;

an image control circuit coupled to the display panel for generating a data signal and a scan signal;

a compensation circuit coupled to the image control circuit for generating a compensation signal according to a predetermined look-up table, wherein the look-up table is generated according to the distribution and the magnitude of currents flowing through the scan lines of the display panel; and

a driver circuit coupled to the image control circuit and the compensation circuit for outputting data line driving signals to data lines of the display panel according to the compensation signal and the data signal and for outputting scan line driving signals to scan lines of the display panel according to the scan signal to drive the display panel to display images.

10. The flat display of claim 9 wherein the display panel is an organic light emitting diode (OLED) display panel.

11. A method for compensating driving signals of a display panel, the method comprising:

generating a data signal and a scan signal;

generating a compensation signal according to the distribution and magnitude of currents flowing through scan lines of the display panel; and

outputting data line driving signals to data lines of the display panel according to the compensation signal and the data signal and outputting scan line driving signals to the scan lines of the display panel according to the scan signal.

12. The method of claim 11 further comprising measuring the distribution and the magnitude of the currents flowing through the scan lines of the display panel.

13. The method of claim 11 wherein the display panel is an organic light emitting diode (OLED) matrix.

14. A method for compensating driving signals of a display panel, the method comprising:

generating a data signal and a scan signal;

generating a compensation signal according to a predetermined look-up table, wherein the look-up table is generated according to the distribution and the magnitude of currents flowing through the scan lines of the display panel; and

outputting data line driving signals to data lines of the display panel according to the compensation signal and the data signal and outputting scan line driving signals to scan lines of the display panel according to the scan signal.

15. The method of claim 14 wherein the display panel is an organic light emitting diode (OLED) matrix.