Method for compensating data and display apparatus for performing the method

• US 8,767,001 B2
• Filed: 11/07/2011
• Issued: 07/01/2014
• Est. Priority Date: 11/22/2010
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Nam-Gon, Park, Bong-Im, Jeon, Byung-Kil
• Primary Examiner(s): Thompson, James A
• Assistant Examiner(s): BEARD, CHARLES LLOYD
• Application Number:
  US13/290,851
• Publication Number:
  US 20120127191A1
• Time in Patent Office: 967 Days
• Field of Search: None
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A method of compensating data uses a look-up table divided into a first area, a second area and a boundary area between the first and second areas defined by a first previous reference value, a second previous reference value greater than the first previous reference value, a first current reference value and a second current reference value less than the first current reference value. A compensation data of a current frame is generated based on to which one of the first, second and boundary areas grayscale data of previous and current frames belongs.

Claims

1. A method of compensating data, the method comprising:

providing a look-up table divided into a first area, a second area and a boundary area between the first and second areas,

said first, second and boundary areas being generated by a first previous reference value, a second previous reference value greater than the first previous reference value, a first current reference value and a second current reference value less than the first current reference value; and

generating compensation data for a current frame based on whether grayscale data of said current frame and of a previous frame satisfy a condition for one of the first, second or boundary areas,

wherein the condition for the first area is that grayscale data of the previous frame has a value less than the first previous reference value and the grayscale data of the current frame has a value greater than a first current reference value,

the condition for the second area is that grayscale data of the previous frame has a value greater than the second previous reference value and grayscale data of the current frame has a value less than a second current reference value, or that grayscale data of the previous frame has a value greater than the second previous reference value and grayscale data of the current frame has a value greater than a second current reference value, or that grayscale data of the previous frame has a value less than the second previous reference value and grayscale data of the current frame has a value less than a second current reference value, and

the condition for the boundary area is that grayscale data of the previous frame has a value between the first and second previous reference values, or that grayscale data of the current frame has a value between the first and second current reference values, the boundary area being between the first and second areas.

2. The method of claim 1, wherein generating the compensation data comprises:

generating a first compensation data when grayscale data of the previous and current frames satisfy the condition for the first area;

generating a second compensation data when grayscale data of the previous and current frames satisfy the condition for the second area; and

generating a third compensation data when grayscale data of the previous and current frames satisfy the condition for the boundary area.

3. The method of claim 2, wherein

the condition for the boundary area is that grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value between the first and second current reference values or that grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value greater than the first current reference value, or that grayscale data of the current frame has a value between the first and second current reference values and grayscale data of previous frame has a value less than the first previous reference value.

4. The method of claim 2, wherein generating the third compensation data comprises:

generating a fourth compensation data when grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value greater than the first current reference value;

generating a fifth compensation data when grayscale data of the previous frame is less than the first previous reference value and grayscale data of the current frame has a value between the first and second current reference values; and

generating a sixth compensation data when grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value between the first and second current reference values.

5. The method of claim 4, wherein

said fourth compensation data is a function of the grayscale value of the current frame, the first compensation data, the first current reference value, a first preset reference data, and a difference between the first and second previous reference values,

said fifth compensation data is a function of the grayscale value of the previous frame, the first compensation data, the first previous reference value, a second preset reference data, and a difference between the first and second current reference values, and

said sixth compensation data is a function of the grayscale values of the previous and current frames, the second compensation data, the first previous and current reference values, the first and second preset reference data, third and fourth preset reference data, and the differences between the first and second previous reference values and the first and second current reference values.

6. The method of claim 2, wherein the grayscale data comprises red-grayscale data, green-grayscale data and blue-grayscale data, and

the first to third compensation data have the different values depending on the red, green and blue grayscale data values, respectively.

7. The method of claim 2, wherein the first compensation data comprises one preset grayscale value.

8. The method of claim 2, wherein the second compensation data is a varying function of the grayscale data of the previous frame and the grayscale data of the current frame.

15. The display apparatus of claim 8, further comprising:

a first data compensation part configured to generate compensation data for red-grayscale data;

a second data compensation part configured to generate compensation data for green-grayscale data; and

a third data compensation part configured to generate compensation data for blue-grayscale data,

wherein each of the first to third data compensation parts comprises said frame memory, said look up table and said compensation part.

9. A display apparatus for compensating display data, comprising:

a frame memory for storing grayscale data of a previous frame;

a look-up table divided into a first area, a second area and a boundary area between the first and second areas,

said first, second, and boundary areas being generated by a first previous reference value, a second previous reference value greater than the first previous reference value, a first current reference value and a second current reference value less than the first current reference value; and

a compensation part configured to generate compensation data for a current frame based on whether grayscale data of said current frame and of said previous frame satisfy a condition for one of the first, second or boundary areas,

wherein the condition for the first area is that grayscale data of the previous frame has a value less than the first previous reference value and the grayscale data of the current frame has a value greater than a first current reference value,

the condition for the second area is that grayscale data of the previous frame has a value greater than the second previous reference value and grayscale data of the current frame has a value less than a second current reference value, or that grayscale data of the previous frame has a value greater than the second previous reference value and grayscale data of the current frame has a value greater than a second current reference value, or that grayscale data of the previous frame has a value less than the second previous reference value and grayscale data of the current frame has a value less than a second current reference value, and

the condition for the boundary area is that grayscale data of the previous frame has a value between the first and second previous reference values, or that grayscale data of the current frame has a value between the first and second current reference values, the boundary area being between the first and second areas.

10. The display apparatus of claim 9, wherein the compensation part

generates a first compensation data when grayscale data of the previous and current frames satisfy the condition for the first area,

generates a second compensation data when grayscale data of the previous and current frames satisfy the condition for the second area, and

generates a third compensation data when grayscale data of the previous and current frames satisfy the condition for the boundary area.

11. The display apparatus of claim 10, wherein

the condition for the boundary area is that grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value between the first and second current reference values or that grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value greater than the first current reference value, or that grayscale data of the current frame has a value between the first and second current reference values and grayscale data of previous frame has a value less than the first previous reference value.

12. The display apparatus of claim 11, wherein

the third compensation data include a fourth compensation data, a fifth compensation data, and a sixth compensation data, wherein the compensation part

generates the fourth compensation data when grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value greater than the first current reference value,

generates the fifth compensation data when grayscale data of the previous frame is less than the first previous reference value and grayscale data of the current frame has a value between the first and second current reference values, and

generates the sixth compensation data when grayscale data of the previous frame has a value between the first and second previous reference values and grayscale data of the current frame has a value between the first and second current reference values.

13. The display apparatus of claim 12, wherein

said fourth compensation data is a function of the grayscale value of the current frame, the first compensation data, the first current reference value, a first preset reference data, and a difference between the first and second previous reference values,

said fifth compensation data is a function of the grayscale value of the previous frame, the first compensation data, the first previous reference value, a second preset reference data, and a difference between the first and second current reference values, and

said sixth compensation data is a function of the grayscale values of the previous and current frames, the second compensation data, the first previous and current reference values, the first and second preset reference data, third and fourth preset reference data, and the differences between the first and second previous reference values and the first and second current reference values.

14. The display apparatus of claim 10, wherein said first compensation data is a preset grayscale value.

16. The display apparatus of claim 9, further comprising:

a display panel configured to display images;

a data driving part configured to convert the first to third compensation data into an analog data signal and output the data signal to the display panel; and

a gate driving part configured to output a gate signal to the display panel synchronized with the output of the data driving part.