Display device

Patent metadata

Field	Value
Publication number	US-9251756-B2
Application number	US-201314025479-A
Country	US
Kind code	B2
Filing date	Sep 12, 2013
Priority date	Apr 11, 2013
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A display device includes: a display panel configured to display an image; and a signal controller configured to control signals to drive the display panel. The signal controller includes: an image data converter configured to convert image data of “m” bits into image data of “n” bits; a gray voltage generator configured to generate a gray voltage corresponding to the image data of “n” bits; a control signal generator configured to generate a gate control signal; and a luminance change controller configured to control a luminance change period of an image displayed via the display panel to be greater than or equal to one second.

First claim

What is claimed is:

1. A display device, comprising:
a display panel configured to display an image; and
a signal controller configured to control signals to drive the display panel,
wherein the signal controller comprises:
an image data converter configured to convert image data of “m” bits into image data of “n” bits;
a gray voltage generator configured to generate a gray voltage corresponding to the image data of “n” bits;
a control signal generator configured to generate a gate control signal; and
a luminance change controller configured to control a luminance change period of an image displayed via the display panel to be greater than or equal to one second and to change a width of the gate control signal within the luminance change period.

2. The display device of claim 1 , wherein:
the value of “n” is greater than the value of “m;”
the image data converter is configured to:
add compensation data to the image data of “n” bits; and
output the added data; and

the compensation data comprises values that change within the luminance change period.

3. The display device of claim 2 , wherein the compensation data comprises values that gradually increase and gradually decrease within the luminance change period.

4. The display device of claim 1 , wherein:
the gray voltage generator is configured to generate the gray voltage based on a gamma correction coefficient; and
the gamma correction coefficient comprises values that change within the luminance change period.

5. The display device of claim 4 , wherein the gamma correction coefficient comprises values that gradually increase and gradually decrease within the luminance change period.

6. The display device of claim 1 , wherein:
the gate control signal comprises a gate clock signal;
the control signal generator is configured to output the gate clock signal to the luminance change controller; and
the width is a width of the gate clock signal.

7. The display device of claim 6 , wherein the width of the gate clock signal gradually increases and gradually decreases within the luminance change period.

8. The display device of claim 1 , wherein:
the gate control signal comprises a gate clock signal and a gate-on enable signal;
the control signal generator is configured to output the gate clock signal and the gate-on enable signal to the luminance change controller; and
the width is a width of the gate-on enable signal.

9. The display device of claim 8 , wherein:
the width of the gate-on enable signal gradually increases and gradually decreases within the luminance change period.

10. The display device of claim 1 , wherein:
the display panel comprises intersecting gate lines and data lines; and
the display device further comprises:
a gate driver configured to apply a gate signal comprising a gate-on voltage and a gate-off voltage to the gate lines; and
a data driver configured to apply the gray voltage corresponding to the image data of “n” bits to the data lines as a data voltage.

11. The display device of claim 10 , wherein the width of the gate-on voltage changes within the luminance change period.

12. The display device of claim 11 , wherein the width of the gate-on voltage gradually increases and gradually decreases within the luminance change period.

13. The display device of claim 1 , further comprising a flicker pattern determiner configured to:
determine whether the image comprises a flicker pattern based on receiving the image data of “m” bits; and
provide a result of the determination to the luminance change controller.

14. The display device of claim 13 , wherein the luminance change controller is configured to control a luminance change period of the image displayed via the display panel to be greater than or equal to one second when the result indicates the flicker pattern exists.

15. The display device of claim 14 , wherein the luminance change controller is configured to not control the luminance change period of the image displayed via the display panel when the result does not indicate the flicker pattern.

16. The display device of claim 1 , wherein:
the image data converter is configured to:
add compensation data to the image data of “n” bits; and
output the added data;

the gray voltage generator is configured to generate the gray voltage based on a gamma correction coefficient; and
the compensation data and the gamma correction coefficient comprise values that change within the luminance change period.

17. The display device of claim 1 , wherein
the image data converter is configured to:
add compensation data to the image data of “n” bits; and
output the added data;

the compensation data comprises values that change within the luminance change period;
the gate control signal comprises a gate clock signal;
the control signal generator is configured to output the gate clock signal to the luminance change controller; and
the width is a width of the gate clock signal.

18. The display device of claim 1 , wherein:
the gray voltage generator is configured to generate the gray voltage based on a gamma correction coefficient;
the gamma correction coefficient comprises values that change within the luminance change period;
the gate control signal comprises a gate clock signal;
the control signal generator is configured to: output the gate clock signal to the luminance change controller; and
the width is a width of the gate clock signal.

19. The display device of claim 1 , wherein:
the image data converter is configured to:
add compensation data to the image data of “n” bits; and
output the added data;

the gray voltage generator is configured to generate the gray voltage based on a gamma correction coefficient;
the compensation data and the gamma correction coefficient comprise values that change within the luminance change period;
the gate control signal comprises a gate clock signal;
the control signal generator is configured to output the gate clock signal to the luminance change controller; and
the width is a width of the gate clock signal.

20. The display device of claim 1 , wherein:
the image data converter is configured to:
add compensation data to the image data of “n” bits; and
output the added data;

the gray voltage generator is configured to generate the gray voltage based on a gamma correction coefficient;
the compensation data and the gamma correction coefficient comprise values that change within the luminance change period;
the gate control signal comprises a gate clock signal and a gate-on enable signal;
the control signal generator is configured to output the gate clock signal and the gate-on enable signal to the luminance change controller; and
the width is a width of the gate-on enable signal.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Yong-Jun
• Ko Hyun Seok
• Park Po-Yun
• Lee Min Joo
• Jung Youn Jin
• Cho Jung Hwan

Classifications

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/3648

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

• G09G3/3614

  Control of polarity reversal in general · CPC title

• G09G3/3677 Primary

  suitable for active matrices only · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title