Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-10957271-B2
Application number	US-201916372760-A
Country	US
Kind code	B2
Filing date	Apr 2, 2019
Priority date	Jun 21, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A display device includes a first data driver which is disposed at an upper side of a display panel and supplies a data signal to data lines of a plurality of data lines, a second data driver which is disposed at a lower side of the display panel and supplies a data signal to remaining data lines of the plurality of data lines, and a signal controller which outputs a corrected image signal, based on a first lookup table which stores a correction value of a first input image signal for the first data driver and a second lookup table which stores a correction value of a second input image signal for the second data driver.

First claim

What is claimed is:

1. A display device comprising:
pixels arranged in rows and columns in a display area of a display panel;
a first data driver which is disposed at an upper side of the display panel and supplies a data signal to first data lines of a plurality of data lines;
a second data driver which is disposed at a lower side of the display panel and supplies a data signal to second data lines of the plurality of data lines; and
a signal controller which outputs a corrected image signal, based on a first lookup table which stores a first correction value of a first input image signal for the first data driver based on a location of the first data driver with respect to a position on the display panel and a second lookup table which stores a second correction value of a second input image signal for the second data driver based on a location of the second data driver with respect to a position on the display panel,
wherein one of the rows includes first pixels connected to the first data lines and second pixels connected to the second data lines, the first pixels and the second pixels being connected to a same gate line to be simultaneously supplied with respective data signals, and
wherein the first and second correction values are set to different values so as to compensate for a difference between a charging rate of the first data lines by the first data driver and a charging rate of the second data lines by the second data driver.

2. The display device of claim 1 , wherein the signal controller generates the corrected image signal with respect to the first input image signal for the first data driver, based on the first lookup table, and generates the corrected image signal with respect to the second input image signal for the second data driver, based on the second lookup table.

3. The display device of claim 1 , wherein the first lookup table includes a plurality of first sub-lookup tables, and
the second lookup table includes a plurality of second sub-lookup tables.

4. The display device of claim 3 , wherein the display panel is divided into N regions where N is a natural number,
wherein the plurality of first sub-lookup tables and the plurality of second sub-lookup tables correspond to at least one of the N divided regions of the display panel.

5. The display device of claim 4 , wherein the signal controller generates the corrected image signal with respect to the first input image signal with reference to a first sub-lookup table corresponding to a region to which a pixel to display the first input image signal belongs, and generates the corrected image signal with respect to the second input image signal with reference to a second sub-lookup table corresponding to a region to which a pixel to display the second input image signal belongs.

6. The display device of claim 3 , wherein the pixels include a plurality of sub-pixels which is coupled to the plurality of data lines and displays images of different colors, and
the plurality of first sub-lookup tables and the plurality of second sub-lookup tables respectively correspond to the plurality of sub-pixels.

7. The display device of claim 1 , wherein the signal controller outputs the corrected image signal, further based on a third lookup table which stores a coefficient value applied to the first and second correction values of the first lookup table and the second lookup table.

8. The display device of claim 7 , wherein the signal controller generates the corrected image signal with respect to the first input image signal by multiplying the coefficient value by the first correction value of the first lookup table, and generates the corrected image signal with respect to the second input image signal by multiplying the coefficient value by the second correction value of the second lookup table.

9. The display device of claim 7 , wherein the display panel is divided into N regions where N is a natural number,
wherein the third lookup table stores a plurality of coefficient values respectively corresponding to the N regions.

10. The display device of claim 1 , wherein the signal controller transfers data generated based on the corrected image signal to the first data driver and the second data driver,
wherein the first data driver and the second data driver transfer a data voltage corresponding to the data as the data signal to the plurality of data lines.

11. A method for driving a display device including a first data driver disposed at an upper side of a display panel to supply a data signal to first data lines of a plurality of data lines, a second data driver disposed at a lower side of the display panel to supply a data signal to second data lines of the plurality of data lines, and a signal controller for controlling the first data driver and the second data driver, the method comprising:
receiving, by the signal controller, a first input image signal for the first data driver and a second input image signal for the second data driver; and
outputting a corrected image signal, based on a first lookup table for storing a first correction value of the first input image signal for the first data driver based on a location of the first data driver with respect to a position on the display panel and a second lookup table for storing a second correction value of a second input image signal for the second data driver based on a location of the second data driver with respect to a position on the display panel,
wherein the first and second correction values are set to different values so as to compensate for a difference between a charging rate of the first data lines by the first data driver and a charging rate of the second data lines by the second data driver.

12. The method of claim 11 , wherein the outputting the corrected image signal includes:
generating the corrected image signal with respect to the first input image signal for the first data driver, based on the first lookup table; and
generating the corrected image signal with respect to the second input image signal for the second data driver, based on the second lookup table.

13. The method of claim 11 , wherein the first lookup table includes a plurality of first sub-lookup tables, and
the second lookup table includes a plurality of second sub-lookup tables.

14. The method of claim 13 , wherein the display panel is divided into N regions where N is a natural number,
wherein the plurality of first sub-lookup tables and the plurality of second sub-lookup tables correspond to at least one of the N divided region regions of the display panel.

15. The method of claim 14 , wherein the outputting the corrected image signal includes:
generating the corrected image signal with respect to the first input image signal with reference to a first sub-lookup table corresponding to a region to which a pixel to display the first input image signal belongs; and
generating the corrected image signal with respect to the second input image signal with reference to a second sub-lookup table corresponding to a region to which a pixel to display the second input image signal belongs.

16. The method of claim 13 , wherein the display device further includes pixels including a plurality of sub-pixels coupled to the plurality of data lines, the plurality of sub-pixels displaying images of different colors,
wherein the plurality of first sub-lookup tables and the plurality of second sub-lookup tables respectively correspond to the plurality of sub-pixels.

17. The method of claim 11 , wherein the corrected image signal is output further based on a third lookup

Assignees

• Samsung Display Co Ltd

Inventors

• Park Suk Jin
• Kim Yoon Gu
• Park Jae Hyoung
• Takegama Akihiro

Classifications

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G2310/0248

  Precharge or discharge of column electrodes before or after applying exact column voltages · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title

• G09G3/3685 Primary

  Details of drivers for data electrodes · CPC title