Display apparatus and method of driving the same

Patent metadata

Field	Value
Publication number	US-9390645-B2
Application number	US-201414450130-A
Country	US
Kind code	B2
Filing date	Aug 1, 2014
Priority date	Dec 31, 2013
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

A display apparatus is provided. The display apparatus includes a display panel including a plurality of display blocks; a driving circuit configured to control an image to be displayed on the display panel; and a timing controller configured to control the driving circuit in response to an image signal and a control signal and to provide a data signal to the driving circuit, wherein the timing controller comprises a memory storing gamma correction values corresponding to gray scales of the image signal, and wherein the timing controller outputs the data signal, and the data signal is obtained by correcting the image signal using the gamma correction values.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel including a plurality of display blocks;
a driving circuit configured to control an image to be displayed on the display panel; and
a timing controller configured to control the driving circuit in response to an image signal and a control signal and to provide a data signal to the driving circuit,
wherein the timing controller comprises a memory including a plurality of lookup tables storing gamma correction values corresponding to gray scales of the image signal and an index table storing index values, each of the plurality of display blocks is assigned with an index value based on a position on the display panel, and
wherein the timing controller outputs the data signal, and the data signal is obtained by correcting the image signal using the gamma correction values stored in the plurality of lookup tables based on the index values corresponding to the plurality of display blocks.

2. The display apparatus of claim 1 , wherein the timing controller further comprises:
a position determination unit configured to determine, based on the control signal, a position of a display block on which the image signal is to be displayed, and to output an index signal containing an index value based on the position of the display block; and
a gamma correction unit configured to receive the index signal, to select a lookup table corresponding to the index signal, and to output the data signal, wherein the data signal is obtained by correcting the image signal using the gamma correction values in the lookup table.

3. The display apparatus of claim 2 , wherein a number of the lookup tables is less than a number of the display blocks of the display panel.

4. The display apparatus of claim 3 , wherein each of the lookup tables comprises the gamma correction values of all gray scales of the image signal.

5. The display apparatus of claim 3 , wherein each of the lookup tables comprises gamma correction values of some gray scales of the image signal.

6. The display apparatus of claim 5 , wherein the gamma correction unit is further configured to calculate gamma correction values of gray scales not included in the lookup tables, by using the gamma correction values of the some gray scales, and
wherein the gamma correction unit outputs the data signal, and the data signal is obtained by correcting the image signal using the gamma correction values of the some gray scales and the calculated gamma correction values.

7. The display apparatus of claim 1 , wherein each of the display blocks comprises i×j pixels (i and j each being a positive integer).

8. The display apparatus of claim 1 , wherein each of the display blocks comprises one pixel.

9. A method of driving a display apparatus, the method comprising:
receiving an image signal and a control signal;
storing a plurality of lookup tables and an index table including index values corresponding to each of a plurality of display blocks, wherein each of the plurality of lookup tables includes gamma correction values corresponding to gray scales of the image signal;
selecting, based on the control signal and the index values, a lookup table from the plurality of lookup tables for each of the display blocks, and an index value corresponds to a position of a display block on a display panel on which the image signal is to be displayed;
outputting a data signal, wherein the data signal is obtained by correcting the image signal using the selected lookup table.

10. The method of claim 9 , wherein selecting the lookup table further comprises:
receiving the control signal;
determining, based on the control signal, the position on the display panel on which the image signal is to be displayed;
outputting an index signal corresponding to the determined position; and
selecting the lookup table corresponding to the index signal.

11. The method of claim 9 , wherein outputting the data signal further comprises:
reading the gamma correction value corresponding to a gray scale of the image signal from the selected lookup table; and
outputting the data signal, wherein the data signal is obtained by adding the image signal and the read gamma correction value.

12. The method of claim 9 , wherein selecting the lookup table comprises:
outputting the index signal corresponding to one of the plurality of display blocks; and
selecting the lookup table corresponding to the index signal.

13. The method of claim 12 , wherein each of the display blocks comprises i×j pixels (i and j each being a positive integer).

14. The method of claim 12 , wherein each of the display blocks comprises one pixel.

15. The method of claim 12 , wherein a number of the lookup tables is less than a number of the display blocks of the display panel.

16. The method of claim 9 , wherein each of the lookup tables comprises gamma correction values of all gray scales of the image signal.

17. The method of claim 9 , wherein each of the lookup tables comprises gamma correction values of some gray scales of the image signal.

18. The method of claim 17 , wherein outputting the data signal further comprises:
calculating gamma correction values of gray scales not included in the lookup tables, by using the gamma correction values of the some gray scales; and
outputting the data signal, wherein the data signal is obtained by correcting the image signal using the gamma correction values of the some gray scales and the calculated gamma correction values.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Jae-Seok
• Moon Hoisik
• Nam Gwangho
• Lee Chang-Soo
• Chae Min-Yup
• Choi Hak-Mo

Classifications

• G09G2320/0673

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

• G09G2320/0693

  Calibration of display systems · CPC title

• G09G2320/0276

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

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• 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