ORGANIC LIGHT EMITTING DISPLAY AND DRIVING METHOD THEREOF

• US 20140232409A1
• Filed: 09/05/2013
• Published: 08/21/2014
• Est. Priority Date: 02/21/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KEUM, Min-Ha
• Granted Patent: US 9,311,848 B2
• Time in Patent Office: Days
• US Class Current: 324/414
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An organic light emitting display and a driving method thereof, which can effectively detect degradation information of pixels in a display. An organic light emitting display includes a pixel unit and a degradation detector. The pixel unit has a plurality of pixels positioned at intersection portions of scan lines and data lines. The degradation detector divides the pixel unit into a plurality of first blocks each including a plurality of pixels, and detects degradation information for each second block including a plurality of first blocks. In the degradation detector, the second blocks are divided so that each second block shares one or more first blocks with another second block adjacent thereto.

Claims

1. An organic light emitting display, comprising:

a pixel unit having a plurality of pixels positioned at intersection portions of scan lines and data lines; and

a degradation detector dividing the pixel unit into a plurality of first blocks each including a plurality of pixels, and detecting degradation information for a second block that includes a plurality of first blocks, said degradation detector divides the second blocks so that each second block shares one or more first blocks with another second block adjacent thereto.

2. The organic light emitting display of claim 1, wherein the degradation detector generates accumulation data for each first block of the plurality of first blocks during a certain period, and detects the degradation information by adding the accumulation data for each second block.

3. The organic light emitting display of claim 1, wherein the degradation detector divides the pixel unit into the second blocks to each include two or more first blocks in a horizontal direction and two or more first blocks in a vertical direction.

4. The organic light emitting display of claim 1, wherein the degradation detector divides the pixel unit into the second blocks by shifting the second blocks in the horizontal and vertical directions, corresponding to shift interval information included in a shift control signal supplied from the outside thereof.

5. The organic light emitting display of claim 1, wherein the degradation detector divides the pixel unit into the second blocks by shifting the second blocks in the horizontal and vertical directions, corresponding to predetermined shift interval information.

6. The organic light emitting display of claim 1, wherein the degradation detector includes:

a data accumulation unit generating accumulation data for each first block during a certain period;

a degradation data generation unit generating degradation data by adding the accumulation data for each second block; and

a degradation decision unit generating a degradation detection signal corresponding to the degradation data.

7. The organic light emitting display of claim 6, wherein the data accumulation unit includes:

a first counter receiving a first horizontal block control signal that means the number of data in the horizontal direction so as to generate a first counting signal by counting the number of data in the horizontal direction;

a second counter receiving a first vertical block control signal that means the number of data in the vertical direction so as to generate a second counting signal by counting the number of data in the vertical direction;

a third counter generating a third counting signal sequentially increased corresponding to the first counting signal;

a fourth counter generating a fourth counting signal sequentially increased corresponding to the second counting signal; and

an accumulation data generator generating accumulation data for each first block divided by the third and fourth counting signals during a certain period.

8. The organic light emitting display of claim 6, wherein the degradation data generation unit includes:

a detection position setting unit allowing the second blocks to be divided, using a second horizontal block control signal including information on the positions of first blocks on a horizontal line, a second vertical block control signal including information on the positions of first blocks on a vertical line, and information on the interval by which the second blocks are shifted; and

a data adding unit generating a data addition value of each second block by adding accumulation data of the first blocks included in each second block, and generating degradation data for each second block, based on the data addition value.

9. The organic light emitting display of claim 8, wherein the degradation data includes information on the position and degradation of the second block.

10. The organic light emitting display of claim 6, wherein the degradation decision unit generates the degradation detection signal when the degradation data is a predetermined reference value or more.

11. The organic light emitting display of claim 10, wherein the degradation detection signal includes information on the position and degradation of a corresponding second block.

12. A driving method of an organic light emitting display, comprising:

dividing a pixel unit into a plurality of first blocks each including a plurality of pixels;

generating accumulation data by accumulating data for each first block during a certain period;

dividing the pixel unit into second blocks each including a plurality of first blocks; and

detecting degradation information for each second block by adding accumulation data of the first blocks included in each second block,

wherein the second blocks are divided by being sequentially shifted in horizontal and vertical directions, and

wherein the second blocks are divided so that each second block shares one or more first blocks with another second block adjacent thereto.

13. The driving method of claim 12, wherein the second blocks are divided so that each second block includes two or more first blocks in the horizontal direction and two or more first blocks in the vertical direction.

14. The driving method of claim 12, wherein the second blocks are divided by being shifted in the horizontal and vertical directions, corresponding to shift interval information included in a shift control signal supplied from the outside of the organic light emitting display.

15. The driving method of claim 12, wherein the second blocks are divided by being shifted in the horizontal and vertical directions, corresponding to predetermined shift interval information.

16. The driving method of claim 12, wherein the dividing of the pixel unit into the plurality of first blocks each including the plurality of pixels includes:

receiving a first horizontal block control signal that means the number of data in the horizontal direction so as to generate a first counting signal by counting the number of data in the horizontal direction;

receiving a first vertical block control signal that means the number of data in the vertical direction so as to generate a second counting signal by counting the number of data in the vertical direction;

generating a third counting signal sequentially increased corresponding to the first counting signal;

generating a fourth counting signal sequentially increased corresponding to the second counting signal; and

allowing the first blocks to be divided by the third and fourth counting signals.

17. The driving method of claim 12, wherein the dividing of the pixel unit into the second blocks each including the plurality of first blocks includes allowing the second blocks to be divided, using a second horizontal block control signal including information on the positions of first blocks on a horizontal line, a second vertical block control signal including information on the positions of first blocks on a vertical line, and information on the interval by which the second blocks are shifted.

18. The driving method of claim 12, further comprising deciding the presence of degradation by comparing the degradation information for each second block with a predetermined reference value.

19. The driving method of claim 18, further comprising generating a degradation detection signal including information on the position and degradation of a corresponding second block when the degradation information is the predetermined reference value or more.

20. An organic light emitting display, comprising:

a pixel unit having a plurality of pixels positioned at intersection portions of scan lines and data lines; and

a degradation detector dividing the pixel unit into a plurality of first blocks each including a plurality of pixels, and detecting degradation information for a second block that includes a plurality of first blocks, said degradation detector divides the second blocks so that each second block shares one or more first blocks with another second block adjacent thereto,

wherein the second blocks are divided by being sequentially shifted in horizontal and vertical directions, and

wherein the second blocks are divided so that each second block shares one or more first blocks with another second block immediately adjacent thereto.