Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-10089942-B2
Application number	US-201615255697-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Jan 18, 2016
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A display device includes a mapping unit for mapping main color data having information on three main colors to generate mapped main data including red, green, and blue information and mapped white data including white information, a compensation lookup table for storing a plurality of gamma compensation values, a gamma compensator for generating compensated main data obtained by gamma-compensating the mapped main data based on a first gamma compensation value corresponding to first gamma white data from among the plurality of gamma compensation values and a second gamma compensation value corresponding to second gamma white data from among the plurality of gamma compensation values by referring to the compensation lookup table, a renderer for sub-pixel-rendering the mapped white data to generate rendered white data, and a splitter for converting the rendered white data into the first and second gamma white data based on different first and second gamma curves, respectively.

First claim

What is claimed is:

1. A display device comprising:
a mapping unit configured to map main color data having information on three main colors to generate mapped main data comprising red, green, and blue information and mapped white data comprising white information;
a compensation lookup table configured to store a plurality of gamma compensation values;
a gamma compensator configured to generate compensated main data obtained by gamma-compensating the mapped main data based on a first gamma compensation value corresponding to first gamma white data from among the plurality of gamma compensation values and a second gamma compensation value corresponding to second gamma white data from among the plurality of gamma compensation values by referring to the compensation lookup table;
a renderer configured to sub-pixel-render the mapped white data to generate rendered white data; and
a splitter configured to convert the rendered white data into the first and second gamma white data based on different first and second gamma curves, respectively.

2. The display device of claim 1 , wherein each of the plurality of gamma compensation values comprises a red gamma compensation value, a green gamma compensation value, and a blue gamma compensation value to be compensated according to grayscale values of the first and second gamma white data.

3. The display device of claim 2 , wherein the gamma compensator is configured to generate the compensated main data based on the first gamma compensation value and the second gamma compensation value.

4. The display device of claim 3 ,
wherein the first gamma compensation value comprises a first red gamma compensation value, a first green gamma compensation value, and a first blue gamma compensation value,
wherein the second gamma compensation value comprises a second red gamma compensation value, a second green gamma compensation value, and a second blue gamma compensation value, and
wherein the gamma compensator is configured to add an average value of the first red gamma compensation value and the second red gamma compensation value, an average value of the first green gamma compensation value and the second green gamma compensation value, and an average value of the first blue gamma compensation value and the second blue gamma compensation value to the mapped main data to generate the compensated main data.

5. The display device of claim 1 , wherein the renderer is configured to resample-filter the mapped white data to generate the rendered white data.

6. The display device of claim 1 , further comprising
a split lookup table configured to store high white data values obtained by sampling-converting white data grayscale values based on the first gamma curve and to store low white data values obtained by sampling-converting the white data grayscale values based on the second gamma curve,
wherein the splitter is configured to generate the first or second gamma white data by referring to the split lookup table.

7. The display device of claim 1 , wherein for the same grayscale value, the first gamma curve has a higher brightness value than a reference gamma curve, and the second gamma curve has a lower brightness value than the reference gamma curve.

8. The display device of claim 7 , wherein a gamma value of the reference gamma curve is about 2.2.

9. The display device of claim 1 , further comprising a data driver configured to convert the first and second gamma white data into first and second white pixel voltages, respectively.

10. The display device of claim 9 , further comprising
a display panel comprising:
a plurality of main logic pixels each comprising a first main sub pixel and a second main sub pixel; and
a plurality of white logic pixels each comprising a third main sub pixel and one of a plurality of white sub pixels configured to display white,

wherein the first to third main sub pixels are configured to display different main colors from among red, green, and blue; and
wherein the display device is configured such that a first white sub pixel from among the plurality of white sub pixels receives the first white pixel voltage and a second white sub pixel from among the plurality of white sub pixels receives the second white pixel voltage.

11. The display device of claim 10 , wherein each of the plurality of main logic pixels is adjacent to a corresponding one of the plurality of white logic pixels.

12. The display device of claim 9 , further comprising
a display panel comprising:
a plurality of main logic pixels each comprising a first main sub pixel and a second main sub pixel; and
a plurality of white logic pixels each comprising a third main sub pixel and one of a plurality of white sub pixels configured to display white,

wherein the first main sub pixel, the second main sub pixel, and the third main sub pixel each display different main colors from among red, green, and blue, and
wherein the display device is configured such that in a first section, a first white sub pixel from among the plurality of white sub pixels receives the first white pixel voltage and a second white sub pixel from among the plurality of white sub pixels receives the second white pixel voltage, and in a second section that is temporally subsequent to the first section, the first white sub pixel receives the second white pixel voltage, and the second white sub pixel receives the first white pixel voltage.

13. The display device of claim 12 , wherein each of the first and second sections corresponds to at least n frames (where n is a natural number).

14. The display device of claim 13 , wherein for the same grayscale value, the first gamma curve has a higher brightness value than a reference gamma curve and the second gamma curve has a lower brightness value than the reference gamma curve.

15. A display device driving method comprising:
mapping, with a mapping unit, main color data comprising information on three main colors;
generating, with the mapping unit, mapped main data comprising red, green, and blue information and mapped white data comprising white information;
gamma-compensating, with a gamma compensator, the mapped main data to generate compensated main data based on a first gamma compensation value corresponding to first gamma white data from among a plurality of gamma compensation values and a second gamma compensation value corresponding to second gamma white data from among the plurality of gamma compensation values;
sub-pixel-rendering, with a renderer, the mapped white data to generate rendered white data; and
converting, with a splitter, the rendered white data into first and second gamma white data based on different first and second gamma curves, respectively.

16. The method of claim 15 ,
wherein each of the plurality of gamma compensation values comprises a red gamma compensation value, a green gamma compensation value, and a blue gamma compensation value to be compensated according to white data grayscale values,
wherein the first gamma compensation value comprises a first red gamma compensation value, a first green gamma compensation value, and a first blue gamma compensation value, and
wherein the second gamma compensation value comprises a second red gamma compensation value, a second green gamma compensation value, and a second blue gamma compensation value.

17. The method of claim 16 , wherein the generating of the compensated main data comprises:
calculating a first average value of the first red gamma compensation value and the second red gamma compensation value;
calculating a second average valu

Assignees

• Samsung Display Co Ltd

Inventors

• Moon Hoisik
• Choi Jae-Seok
• Kim Kang-Hyun
• Na Jong-Hee
• Lee Juneyoung
• Yim Hyungwoo
• Chung Jae-Seob
• Chae Min-Yup
• Han Jung-Suk

Classifications

• G09G2340/06

  Colour space transformation · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3607 Primary

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title