Organic electroluminescence display

• US 20080218451A1
• Filed: 12/11/2007
• Published: 09/11/2008
• Est. Priority Date: 03/07/2007
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Kohno, Tohru, Akimoto, Hajime, Kasai, Naruhiko, Ishii, Masato, Miyamoto, Mitsuhide
• Application Number:
  US12/000,293
• Publication Number:
  US 20080218451A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2330/08 Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

The voltage-current property of the specific pixel is measured to store the data on a single line in a line memory. The property data of adjacent pixels are compared. A failure determination unit detects whether or not the pixel to be compared is faulty. If it is determined as being faulty, the faulty pixel is removed from the pixel group to be compared. The burn-in determination unit performs the comparison using normal pixels only to provide the correct burn-in data. The calculation unit reflects the burn-in data in the image data from the host.

Claims

1. A display unit including a screen on which plural pixels each having an OLED device are arranged in a matrix, which measures a property of the OLED device at a predetermined time interval to reflect a change in the property of the OLED device in an image signal,

wherein the change in the property of the OLED device of a subject one of the plural pixels is obtained by comparing between the property of the OLED device of the subject pixel and the property of the OLED device of another pixel, which exist on a same scanning line.

2. The display unit according to claim 1, wherein the another pixel is adjacent to the subject pixel.

3. The display unit according to claim 1, wherein plural pixels are set as the another pixel to obtain the change in the property of the OLED device of the subject pixel by comparing a property derived from a statistical processing of the property of the OLED device of the plural pixels and the property of the OLED device of the subject pixel.

4. The display unit according to claim 1, further comprising a line memory for storing the property of the OLED device of the pixel on the scanning line.

5. A display unit including a screen on which plural pixels each having an OLED device are arranged in a matrix, which measures a property of the OLED device at a predetermined time interval to reflect a change in the property of the OLED device in an image signal,

wherein the change in the property of the OLED device of a subject pixel is obtained by comparing the property of the OLED device of the subject pixel and that of an another pixel in an image display area, and

wherein the property of the OLED device of the another pixel is in a predetermined range of the property of the OLED device.

6. The display unit according to claim 5, wherein the another pixel and the subject pixel exist on a same scanning line.

7. The display unit according to claim 5,

wherein the property of the OLED device of the subject pixel is represented by a voltage between terminals of the OLED device,

wherein the property of the OLED device of the another pixel is represented by a voltage between terminals of the OLED device, and

wherein the property of the OLED device of the another pixel is represented by the voltage between terminals of the OLED device for receiving a specific current application within a predetermined range.

8. The display unit according to claim 5, wherein the another pixel exists adjacent to the subject pixel, both of which exist on a same scanning line.

9. The display unit according to claim 5, wherein when the property of the OLED device of the another pixel is not in the predetermined range of the property of the OLED device, the property of the OLED device of the subject pixel is compared with that of a pixel adjacent to the another pixel.

10. The display unit according to claim 5, further comprising a line memory for storing the property of the OLED device of the pixel on the scanning line.

11. A display unit including a screen on which plural pixels each having an OLED device are arranged in a matrix, which measures a property of the OLED device at a predetermined time interval to reflect a change in the property of the OLED device in an image signal,

wherein the change in the property of the OLED device of a subject pixel is obtained by a comparison with the property of the OLED device of a predetermined reference pixel, and

wherein the property of the OLED device of the predetermined reference pixel is in a predetermined range;

and

wherein the property of the OLED device of the reference pixel is subjected to a periodic inspection whether or not the property of the OLED device of the reference pixel is in the predetermined range.

12. The display unit according to claim 11,

wherein a plurality of the reference pixels exist;

and

wherein when the property of the OLED device of the plurality of the reference pixels is not in the predetermined range of the property of the OLED device, another one of the reference pixels is subjected to the comparison with respect to the property of the OLED device.

13. The display unit according to claim 11,

wherein the property of the OLED device of the subject reference pixel is represented by a voltage between terminals of the OLED device,

wherein the property of the OLED device of the reference pixel is represented by a voltage between terminals of the OLED device, and

wherein the property of the OLED device of the reference pixel is represented by the voltage between terminals of the OLED device for receiving a specific current application within a predetermined range.

14. The display unit according to claim 11, wherein the change in the property of the OLED device of the subject pixel is detected by the comparison with the property of the OLED device of the reference pixel at each measurement of the property of the OLED device of the subject pixel.