Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-10032426-B2
Application number	US-201615092815-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Sep 22, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A display apparatus includes a gamma data generator comprising a spatial pattern having at least a high gamma and a low gamma corresponding to a plurality of sub-pixels arranged in a matrix array in a space division configuration, a temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels in a time division configuration and a spatio-temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels in both a space and time division configuration, and configured to generate gamma data of a sub-pixel using the spatial pattern, the temporal pattern and the spatio-temporal pattern in a cascade configuration.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a data line, a gate line and a sub-pixel connected between the data line and the gate line;
a gamma data generator comprising a spatial pattern having a high gamma and a low gamma corresponding to a plurality of sub-pixels arranged in a matrix array for a space division configuration, a temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels for a time division configuration, a spatio-temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels for a space and time division configuration, and to generate gamma data of a sub-pixel using at least two of the spatial pattern, the temporal pattern or the spatio-temporal pattern in a cascade configuration, a first gamma controller configured to generate first gamma data of the sub-pixel being high gamma data or low gamma data corresponding to image data of the sub-pixel based on a first preset pattern, which is preset to a first one among the spatial, temporal or spatio-temporal patterns, and a second gamma controller configured to generate second gamma data of the sub-pixel being high gamma data or low gamma data corresponding to the first gamma data of the sub-pixel based on a second preset pattern, which is preset to a second one among the spatial, temporal or spatio-temporal patterns; and
a data driver configured to convert the first gamma data and the second gamma data to a data voltage and to output the data voltage to the data line.

2. The display apparatus of claim 1 wherein the data line and the gate line cross each other, and the matrix array is an m×n matrix where m and n are natural numbers.

3. The display apparatus of claim 1 , at least one of the patterns further comprising at least a third gamma corresponding to the plurality of sub-pixels.

4. The display apparatus of claim 1 , the gamma data generator further comprising:
a high gamma look-up table (LUT) configured to store high gamma data corresponding to grayscales based on the high gamma; and
a low gamma LUT configured to store low gamma data corresponding to the grayscales based on the low gamma.

5. The display apparatus of claim 4 , the gamma data generator further comprising:
at least a third gamma controller configured to generate at least third gamma data for the sub-pixel corresponding to the first and second gamma data of the sub-pixel based on at least a third preset to a third one among a spatial, temporal or spatio-temporal pattern.

6. The display apparatus of claim 4 wherein the second gamma data of the sub-pixel comprises first mixing gamma data, second mixing gamma data, third mixing gamma data and fourth mixing gamma data,
the first mixing gamma data is generated using the high gamma LUT of the first preset pattern and the high gamma LUT of the second preset pattern in the cascade method;
the second mixing gamma data is generated using the high gamma LUT of the first preset pattern and the low gamma LUT of the second preset pattern in the cascade method;
the third mixing gamma data is generated using the low gamma LUT of the first preset pattern and the high gamma LUT of the second preset pattern in the cascade method; and
the fourth mixing gamma data is generated using the low gamma LUT of the first preset pattern and the low gamma LUT of the second preset pattern in the cascade method.

7. The display apparatus of claim 4 wherein a number of mixing conditions of the first preset pattern and second preset pattern is at least 9.

8. The display apparatus of claim 4 wherein the temporal pattern, the spatial pattern and the spatio-temporal pattern respectively correspond to a plurality of sub-pixels arranged in a (2×2) matrix array.

9. The display apparatus of claim 4 , further comprising:
a pattern detector configured to detect an image pattern of the image data, and to determine the first preset pattern and the second preset pattern based on the image pattern.

10. The display apparatus of claim 1 wherein the sub-pixel comprises a plurality of sub-areas where each of the plurality of sub-areas is individually driven.

11. A method of driving a display apparatus, which comprises a data line, a gate line and a sub-pixel connected between the data line and the gate line, the method comprising:
generating first gamma data and second gamma data of a sub-pixel using at least two of a spatial pattern, a temporal pattern or a spatio-temporal pattern in a cascade method, the spatial pattern having a high gamma and a low gamma corresponding to a plurality of sub-pixels arranged in a matrix array in a space division method, the temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels in a time division method, and the spatio-temporal pattern having the high gamma and the low gamma corresponding to the plurality of sub-pixels in a space and time division method; and
converting the gamma data to a data voltage as output to the data line,
wherein the first gamma data of the sub-pixel comprises high gamma data or low gamma data corresponding to image data of the sub-pixel based on a first preset pattern, which is preset to a first one among the spatial, temporal or spatio-temporal patterns, and
wherein the second gamma data of the sub-pixel comprises high gamma data or low gamma data corresponding to the first gamma data of the sub-pixel based on a second preset pattern, which is preset to a second one among the spatial, temporal or spatio-temporal patterns.

12. The method of claim 11 , at least one of the patterns further comprising at least a third gamma corresponding to the plurality of sub-pixels.

13. The method of claim 11 , further comprising:
generating third gamma data for the sub-pixel corresponding to the first and second gamma data of the sub-pixel based on a third preset pattern that is preset to a third one among spatial, temporal or spatio-temporal patterns.

14. The method of claim 11 , further comprising:
generating gamma data of the sub-pixel using a high gamma look-up table (LUT), which is configured to store high gamma data corresponding to grayscales based on the high gamma, and a low gamma LUT, which is configured to store low gamma data corresponding to the grayscales based on the low gamma.

15. The method of claim 14 wherein the second gamma data of the sub-pixel comprises first mixing gamma data, second mixing gamma data, third mixing gamma data and fourth mixing gamma data,
the first mixing gamma data is generated using the high gamma LUT of the first preset pattern and the high gamma LUT of the second preset pattern in the cascade method;
the second mixing gamma data is generated using the high gamma LUT of the first preset pattern and the low gamma LUT of the second preset pattern in the cascade method;
the third mixing gamma data is generated using the low gamma LUT of the first preset pattern and the high gamma LUT of the second preset pattern in the cascade method; and
the fourth mixing gamma data is generated using the low gamma LUT of the first preset pattern and the low gamma LUT of the second preset pattern in the cascade method.

16. The method of claim 11 , wherein a number of mixing conditions of the first preset pattern and second preset pattern is at least 9.

17. The method of claim 11 , wherein the temporal pattern, the spatial pattern and the spatio-temporal pattern respectively correspond to a plurality of sub-pixels arranged in a (2×2) matrix array.

18. The method of claim

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Gi Geun
• Choi Nam-Gon
• Kang Bong-Gyun
• Bae Jae-Sung
• Shin Dong Hwa

Classifications

• G09G3/3688 Primary

  suitable for active matrices only · CPC title

• G09G2320/0673

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

• G09G5/10

  Intensity circuits · CPC title

• G09G3/3607

  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

• G09G2300/0447

  for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA] · CPC title