Display apparatus and a method of driving the same

Patent metadata

Field	Value
Publication number	US-2020058261-A1
Application number	US-201916662315-A
Country	US
Kind code	A1
Filing date	Oct 24, 2019
Priority date	Sep 23, 2015
Publication date	Feb 20, 2020
Grant date	—

Abstract

A display apparatus includes: a display panel including a data line, a gate line crossing the data line, and a sub pixel connected to the data line and the gate line; a gamma data generator configured to output normal gamma data of a normal gamma curve corresponding to image data when a grayscale of the image data is inside a first grayscale range, and to output high gamma data of a high gamma curve or low gamma data of a low gamma curve based on a spatio-temporal pattern when the grayscale of the image data is outside the first grayscale range; and a data driver configured to convert the gamma data outputted from the gamma data generator to a data voltage and to output the data voltage to the data line.

First claim

What is claimed is:

1 . A display apparatus, comprising:
a display panel comprising a data line, a gate line crossing the data line and a sub pixel connected to the data line and the gate line; an image analyzer configured to analyze image data and to determine whether the image data corresponds to a static image or a moving image; a gamma look-up table (LUT) generator configured to generate a first gamma LUT which has a first difference between high gamma data and low gamma data in a first grayscale range when the image data corresponds to the static image, and to generate a second gamma LUT which has a second difference between the high gamma data and the low gamma data in the first grayscale range when the image data corresponds to the moving image, the second difference being different from the first difference; a gamma controller configured to output the high gamma data or the low gamma data using the first or second gamma LUT generated from the gamma LUT generator; and a data driver configured to convert the gamma data output from the gamma controller to a data voltage and to output the data voltage to the data line.

2 . The display apparatus of claim 1 , wherein when the image data corresponds to the static image, the gamma generator is configured to generate the first gamma LUT which has the first difference between the high gamma data and the low gamma data in a second grayscale range.

3 . The display apparatus of claim 1 , wherein when the image data corresponds to the moving image, the gamma LUT generator is configured to generate the second gamma LUT which has the second difference between the high gamma data and the low gamma data in a second grayscale range, the second difference being more than the first difference.

4 . The display apparatus of claim 1 , wherein the gamma data output from the gamma controller corresponds to the sub pixel.

5 . A method of driving a display apparatus, comprising:
analyzing image data to determine whether the image data corresponds to a static image or a moving image; generating a first gamma look-up table (LUT) which has a first difference between high gamma data and low gamma data in a first grayscale range when the image data corresponds to the static image; generating a second gamma LUT which has a second difference between the high gamma data and the low gamma data in the first grayscale range when the image data corresponds to the moving image, the second difference being different from the first difference; outputting the high gamma data or the low gamma data using a gamma LUT generated based on a spatio-temporal pattern; and converting the outputted high or the low gamma data to a data voltage and outputting the data voltage to the data line.

6 . The method of claim 5 , wherein when the image data corresponds to the static image, the first gamma LUT which has the first difference between the high gamma data and the low gamma data in a second grayscale range, is generated.

7 . The method of claim 5 , wherein when the image data corresponds to the moving image, the second gamma LUT which has the second difference between the high gamma data and the low gamma data in a second grayscale range, is generated, the second difference being more than the first difference.

8 . The method of claim 5 , wherein the outputted high or low gamma data corresponds to the sub pixel connected to a data line and a gate line.

Assignees

• Samsung Display Co Ltd

Inventors

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

Classifications

• G09G3/3685 Primary

  Details of drivers for data electrodes · CPC title

• G09G2320/0673

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

• G09G2320/10

  Special adaptations of display systems for operation with variable images · CPC title

• G09G2320/0276

  for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title