IMAGE DATA PROCESSING DEVICE AND DISPLAY DEVICE INCLUDING THE SAME

• US 20200135143A1
• Filed: 08/01/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: TAKIGUCHI, Masahiko
• Granted Patent: US 11,011,136 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• 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 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

An image data processing device of the inventive concept includes an image data converter and a light emission amount calculator. The image data converter converts image data into modulation image data. The image data includes first to third data corresponding to the first to third colors, respectively. The modulation image data includes first to fourth modulation data corresponding to the first to fourth colors, respectively. The light emission amount calculator calculates the fourth modulation data based on the ratio between the first data and the second data. The fourth color includes a color based on mixing the first color and the second color.

Claims

1. An image data processing device comprising:

an image data converter configured to convert image data comprising a first data corresponding to a first color, a second data corresponding to a second color, and a third data corresponding to a third color into modulation image data comprising a first modulation data corresponding to the first color, a second modulation data corresponding to the second color, a third modulation data corresponding to the third color, and a fourth modulation data corresponding to a fourth color; and

a light emission amount calculator configured to calculate the fourth modulation data based on a ratio between the first data and the second data,

wherein the first to third colors are different from each other, and the fourth color comprises a color based on mixing the first color and the second color.

2. The image data processing device of claim 1, wherein the light emission amount calculator is configured to determine a component amount corresponding to an upper limit of the fourth modulation data based on a lowest value from among the first data and the second data.

3. The image data processing device of claim 2, wherein when the ratio is less than a reference ratio, the light emission amount calculator is configured to determine the component amount as a value of the fourth modulation data.

4. The image data processing device of claim 2, wherein when the ratio is greater than a reference ratio, the light emission amount calculator is configured to determine a value smaller than the component amount as a value of the fourth modulation data, and

wherein the value of the fourth modulation data decreases as the ratio increases.

5. The image data processing device of claim 1, wherein the light emission amount calculator is configured to calculate a utilization rate corresponding to the fourth color based on the ratio and to calculate the fourth modulation data based on the utilization rate.

6. The image data processing device of claim 5, wherein the light emission amount calculator is configured to determine the fourth modulation data by multiplying a component amount corresponding to an upper limit of the fourth modulation data by the utilization rate.

7. The image data processing device of claim 1, wherein the image data converter is configured to determine values of the first to third modulation data based on a value of the fourth modulation data calculated from the light emission amount calculator.

8. The image data processing device of claim 1, wherein the image data converter is configured to convert the image data into three-dimensional coordinate values based on an XYZ color space, and to apply the three-dimensional coordinate values and a value of the fourth modulation data to a transform matrix to generate the first to fourth modulation data.

9. The image data processing device of claim 8, wherein the first to fourth modulation data are generated by multiplying an inverse matrix of the transform matrix by a column vector including the three-dimensional coordinate values and the value of the fourth modulation data.

10. The image data processing device of claim 1, wherein the modulation image data further comprises fifth modulation data corresponding to a fifth color based on mixing the second color and the third color,

wherein the light emission amount calculator is further configured to calculate the fifth modulation data based on a ratio between the second data and the third data.

11. The image data processing device of claim 10, wherein the light emission amount calculator is configured to calculate a first component amount corresponding to an upper limit of the fourth modulation data by subtracting a first overlapped component amount from a lowest value from among the first data and the second data, and to calculate a second component amount corresponding to an upper limit of the fifth modulation data by subtracting a second overlapped component amount from a lowest value from among the second data and the third data,

wherein a ratio between the first overlapped component amount and the second overlapped component amount corresponds to a ratio between the third data and the first data.

12. The image data processing device of claim 11, wherein the first overlapped component amount has a value obtained by multiplying a ratio of the third data to a sum of the first data and the third data by a lowest value from among the first to third data, and the second overlapped component amount has a value obtained by multiplying a ratio of the first data to a sum of the first data and the third data by the lowest value from among the first to third data.

13. A display device comprising:

a display panel comprising a first pixel corresponding to a first color, a second pixel corresponding to a second color, a third pixel corresponding to a third color, and a fourth pixel corresponding to a fourth color based on mixing the first color and the second color; and

a driving circuit configured to generate first to fourth data voltages provided to each of the first to fourth pixels based on image data comprising first data corresponding to the first color, second data corresponding to the second color, and third data corresponding to the third color,

wherein the driving circuit comprises;

an image data processing device configured to generate first to fourth modulation data corresponding to the first to fourth pixels, respectively, based on a ratio between the first data and the second data; and

a data driver configured to generate the first to fourth data voltages based on the first to fourth modulation data.

14. The display device of claim 13, wherein the image data processing device comprises:

a light emission amount calculator configured to calculate a utilization rate of the fourth pixel based on the ratio and to calculate a value of the fourth modulation data based on the utilization rate; and

an image data converter configured to generate the first to fourth modulation data by adjusting values of the first to third data based on the value of the fourth modulation data.

15. The display device of claim 14, wherein the image data processing device further comprises a preprocessor configured to adjust the image data to correspond to the first to fourth pixels based on image data accumulated before the image data.

16. The display device of claim 14, wherein the image data processing device further comprises a deterioration information calculator configured to calculate deterioration information of each of the first to fourth pixels based on the first to fourth modulation data,

wherein a transform function of the utilization rate for the ratio is adjusted based on the deterioration information.

17. The display device of claim 13, wherein the first pixel is a red color pixel, the second pixel is a green color pixel, the third pixel is a blue color pixel, and the fourth pixel is a yellow color pixel.

18. The display device of claim 13, wherein the display panel further comprises a fifth pixel corresponding to a fifth color based on mixing the second color and the third color,

wherein the image data processing device is further configured to generate fifth modulation data corresponding to the fifth pixel based on a ratio between the second data and the third data,

wherein the data driver is further configured to generate a fifth data voltage based on the fifth modulation data.

19. The display device of claim 18, wherein when a value of the first data is greater than a value of the third data, a value of the fourth modulation data is greater than a value of the fifth modulation data, and when the value of the third data is greater than the value of the first data, the value of the fifth modulation data is greater than the value of the fourth modulation data.

20. The display device of claim 18, wherein the first pixel is a red color pixel, the second pixel is a green color pixel, the third pixel is a blue color pixel, the fourth pixel is a yellow color pixel, and the fifth pixel is a cyan color pixel.