Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-2016005365-A1
Application number	US-201514679401-A
Country	US
Kind code	A1
Filing date	Apr 6, 2015
Priority date	Jul 2, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

A display device includes a timing controller, a data driver, and a display panel. The timing controller includes a first compensator receiving a first image data, selecting a temperature compensation value in accordance with the external temperature, and converting the first image data to a second image data on the basis of the selected temperature compensation value and a second compensator selecting a kickback voltage compensation value predetermined in accordance with the areas of the display panel and converting the second image data to the output image data on the basis of the kickback voltage compensation value selected in accordance with the areas.

First claim

What is claimed is:

1 . A display device comprising:
a timing controller to generate output image data; a data driver to convert the output image data to a data voltage; a display panel comprising a plurality of areas to display an image in accordance with the data voltage; and a temperature sensor to sense an external temperature, wherein the timing controller comprises:
a first compensator to receive first image data, to select a temperature compensation value according to the external temperature, and to convert the first image data to second image data on the basis of the selected temperature compensation value; and
a second compensator to select a kickback voltage compensation value according to an area from among the plurality of areas and to convert the second image data to the output image data on the basis of the selected kickback voltage compensation value.

2 . The display device of claim 1 , wherein the kickback voltage compensation value comprises a first sub-kickback voltage compensation value and a second sub-kickback voltage compensation value, and the second compensator converts the second image data to the output image data using one of the first and second sub-kickback voltage compensation values in response to a polarity signal.

3 . The display device of claim 2 , wherein the data driver converts the output image data to a positive data voltage or a negative data voltage in response to the polarity signal.

4 . The display device of claim 1 , wherein the temperature compensation value is set to correspond to a reference area among the plurality of areas, the reference area being an area having a temperature nearest to an average temperature of the areas.

5 . The display device of claim 1 , wherein the temperature compensation value is set to correspond to the areas, and the first compensator selects the temperature compensation value according to the areas and converts the first image data to the second image data on the basis of the temperature compensation value selected according to the areas.

6 . The display device of claim 1 , wherein the temperature sensor is disposed on the display panel.

7 . The display device of claim 1 , wherein the timing controller further comprises a third compensator that receives input image data and converts the input image data to the first image data on the basis of a color compensation value.

8 . The display device of claim 7 , wherein the display panel comprises a pixel configured to include a high pixel receiving a high-gamma data voltage and a low pixel receiving a low-gamma data voltage having a voltage level lower than a voltage level of the high-gamma data voltage.

9 . The display device of claim 8 , wherein the data driver comprises:
a first data voltage generator converting the output image data to the high-gamma data voltage; and a second data voltage generator converting the output image data to the low-gamma data voltage.

10 . The display device of claim 9 , wherein the first data voltage generator receives a first gamma reference voltage and the second data voltage generator receives a second gamma reference voltage having a voltage level lower than a voltage level of the first gamma reference voltage.

11 . The display device of claim 7 , wherein
the color compensation value comprises a high-color compensation value and a low-color compensation value, the third compensator converts the input image data to first high image data on the basis of the high-color compensation value, converts the input image data to first low image data on the basis of the low-color compensation value, and outputs the first high image data and the first low image data as the first image data, the first compensator converts the first high image data and the first low image data to second high image data and second low image data, respectively, on the basis of the selected temperature compensation value and outputs the second high image data and the second low image data as the second image data, and the second compensator converts the second high image data and the second low image data to output high image data and output low image data, respectively, on the basis of the kickback voltage compensation value selected according to the areas and outputs the output high image data and the output low image data as the output image data.

12 . The display device of claim 11 , wherein the data driver converts the output high image data of the output image data to the high-gamma data voltage and converts the output low image data of the output image data to the low-gamma data voltage.

13 . The display device of claim 10 , wherein
the high-gamma compensation value and the low-color compensation value are set to correspond to the areas, and the third compensator selects the high-gamma compensation value and the low-color compensation value in accordance with the areas and converts the input image data to the first high image data and the first low image data on the basis of the high-gamma compensation value and the low-color compensation value, which are selected according to the areas.

14 . The display device of claim 1 , wherein
the timing controller further comprises a look-up table in which the temperature compensation value is stored, and the first compensator refers to the look-up table and adds the temperature compensation value to the first image data to generate the second image data.

15 . The display device of claim 1 , wherein
the temperature compensation value comprises a first temperature compensation value set to correspond to a first external temperature, and the first compensator linearly or non-linearly interpolates the first temperature compensation value to generate a second temperature compensation value corresponding to a second external temperature different from the first external temperature and converts the first image data to the second image data on the basis of the second temperature compensation value.

16 . The display device of claim 15 , wherein
the temperature compensation value further comprises a third temperature compensation value set to correspond to a third external temperature different from the first and second external temperatures, and the first compensator linearly or non-linearly interpolates the first and third temperature compensation values to generate the second temperature compensation value.

17 . The display device of claim 1 , wherein
the timing controller further comprises a look-up table in which the kickback voltage compensation value is stored, and the second compensator refers to the look-up table and adds the kickback voltage compensation value to the second image data to generate the output image data.

18 . A method of driving a display device, comprising:
generating output image data; converting the output image data to a data voltage; displaying an image in accordance with the data voltage; and sensing an external temperature, wherein the generating of the output image data comprises:
receiving first image data,
selecting a temperature compensation value in accordance with the external temperature,
converting the first image data to second image data on the basis of the selected temperature compensation value,
selecting a kickback voltage compensation value predetermined in accordance with a plurality of areas of a display panel according to the areas, and
converting the second image data to the output image data on the basis of the kickback voltage compensation value selected according to

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Nam-Gon
• Goh Joon-Chul
• Kim Gigeun
• Kim Byungsun
• Kim Jung-Won
• Kim Hongsoo
• Lee Donggyu
• Jin Jakyoung
• You Bonghyun

Classifications

• 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

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G3/3611

  Control of matrices with row and column drivers · CPC title

• G09G2320/041

  Temperature compensation · CPC title