التفاصيل البيبلوغرافية
| العنوان: |
SYSTEM AND METHOD FOR REDUCING MURA DEFECTS |
| Document Number: |
20080036703 |
| تاريخ النشر: |
February 14, 2008 |
| Appl. No: |
11/463934 |
| Application Filed: |
August 11, 2006 |
| مستخلص: |
A representative system for displaying images comprises a pixel array, a conversion circuit, a memory device, and a compensation circuit. The pixel array has a plurality of pixels, each having at least one organic light emitting element equipped with a sensing unit which retrieves display information when the organic light emitting element retrieves a test signal. The conversion circuit determines a display parameter of each organic light emitting element according to the test signal and the display information of each organic light emitting element. The memory device stores the display parameter of each organic light emitting element. The compensation circuit modifies a video signal in accordance with the display parameters stored in the memory device. |
| Inventors: |
Wang, Shou-Cheng (Hsinchu County, TW); Chang, Shih-Chang (Hsinchu County, TW) |
| Assignees: |
TPO DISPLAYS CORP. (Miao-Li County, TW) |
| Claim: |
1. A system for reducing mura defects, comprising: a pixel array comprising a plurality of pixels, each of the pixels comprising an organic light emitting element equipped with a sensing unit which is operative to retrieve display information responsive to the organic light emitting element receiving a test signal; a conversion circuit operative to determine a display parameter of each organic light emitting element according to the test signal and the display information; a memory device operative to store the display parameter of each organic light emitting element; and a compensation circuit operative to modify a video signal to drive the pixel array in accordance with the display parameters stored in the memory device. |
| Claim: |
2. The system as claimed in claim 1, wherein each sensing unit is implemented as a thin film transistor coupled to the corresponding organic light emitting element, and the display information retrieved from each organic light emitting element is a current proportional to the current through the organic light emitting element, or a voltage between the electrodes of the organic light emitting element. |
| Claim: |
3. The system as claimed in claim 2, the pixel array further comprising data lines operative to convey the test signal and the retrieved display information alternatively, wherein each organic light emitting element and the corresponding sensing unit are coupled to the same data line. |
| Claim: |
4. The system as claimed in claim 1, wherein each sensing unit is implemented as a photo sensor operative to retrieve a photo current, induced by light emitted from the corresponding organic light emitting element, as the display information. |
| Claim: |
5. The system as claimed in claim 4, wherein, in a test mode, the organic light emitting elements are enabled to emit light singly, and all photo sensors are enabled to detect the light. |
| Claim: |
6. The system as claimed in claim 1, wherein each sensing unit comprises a thin film transistor coupled to a corresponding organic light emitting element, and a photo sensor, wherein the display information retrieved by each thin film transistor is a current proportional to the current through the corresponding organic light emitting element, or a voltage between electrodes of the corresponding organic light emitting element, and the display information retrieved by each photo sensor is a photo current induced by light emitted from the corresponding organic light emitting element. |
| Claim: |
7. The system as claimed in claim 4, wherein the photo sensor is implemented by an electronic device, the electrical properties of which change with changes in incident light. |
| Claim: |
8. The system as claimed in claim 1, wherein, responsive to a test command, the system is operative to redetermine the display parameters. |
| Claim: |
9. The system as claimed in claim 1, wherein, responsive to the system being turned on, the system is operative to redetermine the display parameters. |
| Claim: |
10. The system as claimed in claim 1, wherein the system is operative to display a static image, wherein the memory device is operative to store a modified video signal generated by the compensation circuit to display the static image, in place of the display parameters. |
| Claim: |
11. The system as claimed in claim 1, wherein the pixel having the shortest lifetime of the organic light emitting elements comprises the sensing unit. |
| Claim: |
12. The system as claimed in claim 1, further comprising a display panel, wherein the pixel array, the conversion circuit, the memory device, and the compensation circuit form a portion of the display panel. |
| Claim: |
13. The system as claimed in claim 12, further comprising an electronic device, wherein the electronic device comprises: the display panel; and an input device coupled to the display panel and operative to provide the video signal to the display panel, such that the display panel displays images. |
| Claim: |
14. The system as claimed in claim 13, wherein the electronic system is a mobile phone, digital camera, Personal Digital Assistant, notebook computer, desktop computer, television, car display, or portable DVD player. |
| Claim: |
15. A method for reducing mura defects comprising: providing a plurality of sensing units in a pixel array, the pixel array comprising a plurality of pixels each comprising an organic light emitting element; providing the organic light emitting elements with test signals; and retrieving display information of each of the organic light emitting elements via corresponding ones of the sensing units; determining a display parameter of each of the organic light emitting elements according to the test signal and the display information of each of the organic light emitting elements; storing the display parameter of each of the organic light emitting elements; and modifying a video signal to drive the pixel array in accordance with the display parameters stored. |
| Claim: |
16. The method as claimed in claim 15, wherein each one of the sensing units is implemented as a thin film transistor coupled to the corresponding organic light emitting element, and the display information retrieved from each organic light emitting element is a current proportional to current through the organic light emitting element, or a voltage between electrodes of the organic light emitting element. |
| Claim: |
17. The method as claimed in claim 15, wherein each of the sensing units is implemented as a photo sensor operative to retrieve a photo current, induced by light emitted from the corresponding organic light emitting element, as the display information. |
| Claim: |
18. The method as claimed in claim 17, wherein retrieving of the display information of each organic light emitting element further comprises enabling the organic light emitting elements to emit light singly when all photo sensors are enabled to detect the light. |
| Claim: |
19. The method as claimed in claim 15 further comprising redetermining the display parameters when the system receives a test command, each time the system is turned on or as the system is operated for a period of time. |
| Claim: |
20. The method as claimed in claim 15 further comprising displaying a static image by storing the modified video signals with respect to the static image in the memory device in place of the display parameters. |
| Current U.S. Class: |
345/76 |
| Current International Class: |
09 |
| رقم الانضمام: |
edspap.20080036703 |
| قاعدة البيانات: |
USPTO Patent Applications |