IP Library › Granted Patent US 8,552,947
Granted Patent B2
US 8,552,947 · App. 13/304,143 · Granted Oct 8, 2013

Driving device and display apparatus having the same

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Quick Facts
Patent No.
US 8,552,947
App. No.
13/304,143
Granted
Oct 8, 2013
Kind
B2
Abstract

In a driving device and a display apparatus having the driving device, a converter converts input image data and outputs first and second sub-image data which have different values. A first compensator compensates the first sub-image data and outputs a first compensated image data, and a second compensator compensates the second sub-image data and outputs a second compensated image data. An output circuit controls output time of the first and second compensated image data. Accordingly, sub-image data for each sub-pixel may be exactly compensated by employing compensators to individually compensate for the sub-image data of each sub-pixel.

Claims (65)

1. A driving device for driving a liquid crystal display device, the liquid crystal display device including a pixel that includes a first sub-pixel and a second sub-pixel, the driving device comprising:

a converter converting input image data for the pixel into first sub-image data for the first sub-pixel and second sub-image data for the second sub-pixel;

a memory unit coupled to the converter and comprising:

a first data memory storing first present sub-image data, which is first sub-image data of a present frame, and outputting first previous sub-image data, which is first sub-image data of a previous frame; and

a second data memory storing second present sub-image data, which is second sub-image data of a present frame, and outputting second previous sub-image data, which is second sub-image data of a previous frame;

a compensator unit coupled to the memory unit and compensating the first and second present sub-image data based on the first and second previous sub-image data and the first and second present sub-image data to generate first and second compensated sub-image data, the compensator unit comprising:

a first compensator part compares a first reference value with a differential value between the first sub-image data and the first previous sub-image data and outputs the first compensated sub-image data based on a result of the comparison, and

a second compensator part compares a second reference value with a differential value between the second sub-image data and the second previous sub-image data and outputs the second compensated sub-image data based on a result of the comparison; and

an output circuit that controls at least one of an output time of the first compensated sub-image data and an output time of the second compensated sub-image data,

wherein the first reference value is different from the second reference value.

2. The driving device of claim 1 , wherein

the first sub-image data generated for the first sub-pixel has a first gray scale, and

the second sub-image data generated for the second sub-pixel has a second gray scale that is different from the first gray scale.

3. The driving device of claim 2 , wherein the first compensated sub-image data has a first gray scale, and

the second compensated sub-image data has a second gray scale that is different from the first gray scale.

4. The driving device of claim 3 , wherein the first gray scale is higher than the second gray scale.

5. The driving device of claim 2 , wherein the first gray scale is higher than the second gray scale.

6. The driving device of claim 1 , wherein

the first compensated sub-image data has a first gray scale, and

the second compensated sub-image data has a second gray scale that is different from the first gray scale.

7. The driving device of claim 6 , wherein the first gray scale is higher than the second gray scale.

8. The driving device of claim 1 , wherein the first reference value is higher than the second reference value.

9. A liquid crystal display device displaying an image, the liquid crystal display device comprising:

a display panel including a pixel, the pixel including a first sub-pixel and a second sub-pixel; and

a driving device for driving the display panel;

the driving device comprising:

a converter converting input image data for the pixel into first sub-image data for the first sub-pixel and second sub-image data for the second sub-pixel;

a memory unit coupled to the converter and comprising:

a first data memory storing first present sub-image data, which is first sub-image data of a present frame, and outputting first previous sub-image data, which is first sub-image data of a previous frame; and

a second data memory storing second present sub-image data, which is second sub-image data of a present frame, and outputting second previous sub-image data, which is second sub-image data of a previous frame;

a compensator unit coupled to the memory unit and compensating the first and second present sub-image data based on the first and second previous sub-image data and the first and second present sub-image data to generate first and second compensated sub-image data, the compensator unit comprising:

a first compensator part compares a first reference value with a differential value between the first sub-image data and the first previous sub-image data and outputs the first compensated sub-image data based on a result of the comparison, and

a second compensator part compares a second reference value with a differential value between the second sub-image data and the second previous sub-image data and outputs the second compensated sub-image data based on a result of the comparison; and

an output circuit that controls at least one of an output time of the first compensated sub-image data and an output time of the second compensated sub-image data,

wherein the first reference value is higher than the second reference value.

10. The liquid crystal display device of claim 9 , wherein

the first sub-image data generated for the first sub-pixel has a first gray scale, and

the second sub-image data generated for the second sub-pixel has a second gray scale that is different from the first gray scale.

11. The display device of claim 10 , wherein the first compensated sub-image data has a first gray scale, and

the second compensated sub-image data has a second gray scale that is different from the first gray scale.

12. The liquid crystal display device of claim 9 , wherein

the first compensated sub-image data has a first gray scale, and

the second compensated sub-image data has a second gray scale that is different from the first gray scale.

13. The liquid crystal display device of claim 9 , further comprising a data driver providing a first data voltage generated based on the first compensated sub-image data to the first sub-pixel, and providing a second data voltage generated based on the second compensated sub-image data to the second sub-pixel.

14. The liquid crystal display device of claim 13 , wherein the first data voltage is different from the second data voltage.

15. The liquid crystal display device of claim 13 , wherein a gamma curve of the first sub-pixel is different from a gamma curve of the second sub-pixel.

16. A method for driving a liquid crystal display device, the liquid crystal display device including a pixel, the pixel including a first sub-pixel and a second sub-pixel, the method comprising:

converting previous input image data for the pixel into first previous sub-image data for the first sub-pixel and second previous sub-image data for the second sub-pixel in a previous frame;

converting present input image data for the pixel into first present sub-image data for the first-sub pixel and second present sub-image data for the second sub-pixel in a present frame;

compensating the first present sub-image data based on a result of comparison with a first reference value and a differential value between the first sub-image data and the first previous sub-image data to generate first compensated sub-image data;

compensating the second present sub-image data based on a result of comparison with a second reference value and a differential value between the second sub-image data and the second previous sub-image data to generate second compensated sub-image data;

outputting the first compensated sub-image data and the second compensated sub-image data; and

controlling at least one of an output time of the first compensated sub-image data and an output time of the second compensated sub-image data,

wherein the first reference value is higher than the second reference value.

17. The method of claim 16 , further comprising storing the first previous sub-image data or the second previous sub-image data in at least one data memory.

18. The method of claim 16 , wherein

the first present sub-image data has a first gray scale, and

the second present sub-image data has a second gray scale that is different from the first gray scale.

19. The method of claim 16 , further comprising:

generating a first data voltage based on the first compensated sub-image data;

providing the first data voltage to the first sub-pixel;

generating a second data voltage based on the second compensated sub-image data; and

providing the second data voltage to the second sub-pixel.

20. The method of claim 19 , wherein the first data voltage is different from the second data voltage.

21. The method of claim 19 , wherein the first sub-pixel has a different gamma curve from the second sub-pixel.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 23, 2012
From: SAMSUNG ELECTRONICS CO., LTD.
To: SAMSUNG DISPLAY CO., LTD.
Reel/Frame 029008/0876 →