Method of adjusting source voltage by vertical portion for driving display panel and display apparatus performing the method

Patent metadata

Field	Value
Publication number	US-9483989-B2
Application number	US-201314067708-A
Country	US
Kind code	B2
Filing date	Oct 30, 2013
Priority date	Jul 5, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A method of driving a display panel includes determining a source voltage level by a vertical portion in a present horizontal line of the display panel based on data of the present horizontal line, the display panel including a plurality of vertical portions extended along a vertical direction and arranged in a horizontal direction (the plurality of vertical portions including a vertical portion), generating correction data of the present horizontal line by the vertical portion utilizing the source voltage level of the present horizontal line determined by the vertical portion, generating a source voltage of the present horizontal line by the vertical portion utilizing the source voltage level of the horizontal line determined by the vertical portion, and driving the display panel by the vertical portion utilizing the correction data and the source voltage of the present horizontal line.

First claim

What is claimed is:

1. A method of driving a display panel, the method comprising:
determining a source voltage level by a vertical portion in a present horizontal line of the display panel based on data of the present horizontal line, the display panel including a plurality of vertical portions extended along a vertical direction and arranged in a horizontal direction, the plurality of vertical portions comprising the vertical portion;
generating correction data of the present horizontal line by the vertical portion utilizing the source voltage level of the present horizontal line determined by the vertical portion;
generating a source voltage of the present horizontal line by the vertical portion utilizing the source voltage level of a horizontal line determined by the vertical portion; and
driving the display panel by the vertical portion utilizing the correction data and the source voltage of the present horizontal line,
wherein the determining the source voltage level comprises:
calculating a variable voltage level with which a voltage can change during a horizontal blanking period;
calculating a number of the horizontal line corresponding to a period during which a reference voltage is to derive a maximum source voltage based on the variable voltage level;
converting maximum data of the present horizontal line and a next horizontal line which is located after the present horizontal line to maximum voltage levels, respectively;
calculating a next minimum voltage level of the present horizontal line, the next minimum voltage level which is to derive a voltage level of the present horizontal line in at a necessary voltage level of the next horizontal line;
calculating a previous minimum voltage level of the present horizontal line, the previous minimum voltage level which is to derive a necessary voltage level of a previous horizontal line at the voltage level of the present horizontal line, the previous horizontal line which is located before the present horizontal line; and
determining the source voltage level of the present horizontal line utilizing the maximum voltage level, the next minimum voltage level and the previous minimum voltage level of the present horizontal line.

2. The method of claim 1 , wherein the source voltage level of the present horizontal line is determined as a maximum value among the maximum voltage level, the next minimum voltage level and the previous minimum voltage level.

3. The method of claim 1 , further comprising:
storing data of the horizontal line corresponding to the number of the horizontal line calculated based on the variable voltage level.

4. The method of claim 1 , wherein the next minimum voltage level is calculated by utilizing the maximum voltage level of the next horizontal line and the variable voltage level.

5. The method of claim 1 , wherein the previous minimum voltage level is calculated by utilizing the source voltage level of the previous horizontal line and the variable voltage level.

6. The method of claim 1 , wherein the correction data of the present horizontal line is generated by utilizing a gray-voltage look-up table (LUT).

7. The method of claim 1 , wherein the correction data and the source voltage of the present horizontal line are generated during the vertical blanking period.

8. A display apparatus comprising:
a display panel including a display element electrically connected to a data line and a gate line and is divided into a plurality of vertical portions comprising a vertical portion, the vertical portions extended along a longitudinal direction of the data line and arranged in a longitudinal direction of the gate line;
a data processing part configured to determine a source voltage level by the vertical portion in a present horizontal line of the display panel based on maximum data of the present horizontal line and to generate correction data of the present horizontal line by the vertical portion utilizing the source voltage level of the present horizontal line;
a source voltage generating part configured to generate a source voltage of the present horizontal line by the vertical portion utilizing the source voltage level of a horizontal line determined by the vertical portion; and
a data driving part configured to drive the display panel by the vertical portion utilizing the correction data and the source voltage of the present horizontal line,
wherein the data processing part is configured to determine the source voltage level of the present horizontal line by utilizing voltage levels of a previous horizontal line of the present horizontal line and a next horizontal line of the present horizontal line, and
wherein the data processing part comprises:
a calculating part configured to calculate a variable voltage level with which a voltage can change during a horizontal blanking period and a number of the horizontal line corresponding to a period during which a reference voltage is to derive a maximum source voltage based on the variable voltage level;
a detecting/converting part configured to convert maximum data of the present horizontal line and the next horizontal line which is located after the present horizontal line to maximum voltage levels, respectively;
a source voltage determining part configured to calculate a next minimum voltage level of the present horizontal line, the next minimum voltage level which is to derive a voltage level of the present horizontal line in at a necessary voltage level of the next horizontal line, to calculate a previous minimum voltage level of the present horizontal line, the previous minimum voltage level which is to derive a necessary voltage level of the previous horizontal line at the voltage level of the present horizontal line, the previous horizontal line which is located before the present horizontal line and to determine the source voltage level of the present horizontal line utilizing the maximum voltage level, the next minimum voltage level and the previous minimum voltage level of the present horizontal line; and
a data correcting part configured to generate the correction data of the present horizontal line by the vertical portion utilizing the source voltage level of the present horizontal line.

9. The display apparatus of claim 8 , wherein the source voltage determining part configured to determine the source voltage level of the present horizontal line as a maximum level of the maximum voltage level, the next minimum voltage level and the previous minimum voltage level.

10. The display apparatus of claim 8 , wherein the data processing part further comprises a storing part configured to store data of the horizontal line corresponding to the number of the horizontal line calculated based on the variable voltage level.

11. The display apparatus of claim 8 , wherein the next minimum voltage level is calculated by utilizing the maximum voltage level of the next horizontal line and the variable voltage level.

12. The display apparatus of claim 8 , wherein the previous minimum voltage level is calculated by utilizing the source voltage level of the previous horizontal line and the variable voltage level.

13. The display apparatus of claim 8 , wherein the correction data of the present horizontal line is generated by utilizing a gray-voltage look-up table (LUT).

14. The display apparatus of claim 8 , wherein the correction data and the source voltage of the present horizontal line are generated during the horizontal blanking period.

15. The display apparatus of claim 8 , wherein the data driving part comprises first to k-th data driving circuits, and
the plurality of vertical p

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jung-Taek
• Yoon Young-Soo
• Lee Eun-Ho
• Jeong Ji-Woong
• Hong Seok-Ha

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G3/3648 Primary

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0673

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