Display apparatus and driving method thereof

Patent metadata

Field	Value
Publication number	US-8976208-B2
Application number	US-201213468534-A
Country	US
Kind code	B2
Filing date	May 10, 2012
Priority date	Sep 6, 2011
Publication date	Mar 10, 2015
Grant date	Mar 10, 2015

Abstract

A display device which includes pixels, a plurality of gate lines, a plurality of data lines, a gate driver configured to drive the plurality of gate lines, a data driver configured to drive the plurality of data lines, and a timing controller configured to control the gate driver and the data driver. The timing controller receives a first image signal and outputs a second image signal to the data driver. The timing controller sequentially outputs a boosting signal and the first image signal as the second image signal. The boosting signal is based on the first image signal and the previous first image signal.

First claim

What is claimed is:

1. A display device comprising:
a plurality of pixels;
a plurality of gate lines;
a plurality of data lines;
a gate driver configured to drive the plurality of gate lines;
a data driver configured to drive the plurality of data lines; and
a timing controller configured to control the gate driver and the data driver,
wherein the timing controller receives a first image signal and outputs a second image signal to the data driver, and
wherein the timing controller sequentially outputs a boosting signal at a current frame as the second image signal, and outputs the first image signal at a subsequent frame as the second image signal,
wherein the boosting signal is based on the first image signal and a previous first image signal, and a frequency of the second image signal is higher than a frequency of the first image signal.

2. The display device of claim 1 , wherein the first image signal is input to the timing controller in an order of a first color signal, a second color signal, and a third color signal in turn, and wherein the timing controller outputs a first color boosting signal corresponding to the first color signal, a second color boosting signal corresponding to the second color signal, and a third color boosting signal corresponding to a third color signal.

3. The display device of claim 2 , wherein the timing controller outputs as the second image signal the first color boosting signal, the first color signal, the second color boosting signal, the second color signal, the third color boosting signal, and the third color signal sequentially in turn according to an input order of the first color signal, the second color signal, and the third color signal.

4. The display device of claim 2 , wherein the first, second and third color signals are reddish, bluish and greenish frame signals, respectively.

5. The display device of claim 4 , wherein the timing controller outputs the boosting signal to have a gradation level higher than that of the reddish frame signal when the first image signal is the reddish frame signal, the boosting signal to have a gradation level lower than that of the bluish frame signal when the first image signal is the bluish frame signal, and the boosting signal to have a gradation level higher than that of the greenish frame signal when the first image signal is the greenish frame signal.

6. The display device of claim 1 , wherein the timing controller comprises:
a frame memory configured to store the first image signal; and a
boosting circuit outputting the boosting signal as the second image signal at the current frame and the first image signal as the second image signal at the subsequent frame.

7. The display device of claim 6 , wherein the boosting circuit comprises:
a lookup table configured to store the boosting signal addressed by the previous first image signal and the first image signal; and
a boosting unit using the previous first image signal stored in the frame memory and the current first image signal to read the boosting signal from the lookup table.

8. The display device of claim 1 , wherein a frequency of the second image signal output from the timing controller is 360 Hz.

9. The display device of claim 1 , further comprising:
a plurality of light source groups arranged opposite the pixels and corresponding to gate line groups of the plurality of gate lines, respectively,
wherein the light source groups are enabled sequentially, and
wherein each of the light source groups is disabled when pixels connected with a corresponding gate line group are driven with a voltage corresponding to the boosting signal by the data driver.

10. The display device of claim 9 , wherein the light source groups are enabled and disabled sequentially every frame.

11. A driving method of a display device comprising:
receiving a current first image signal;
acquiring a previous first image signal and a boosting signal based on the previous first image signal and the current first image;
outputting the boosting signal at a current frame to a data driver as a second image signal for driving pixels; and
outputting the current first image signal at a subsequent frame to the data driver as the second image signal for driving the pixels,
wherein a frequency of the second image signal is higher than a frequency of the first image signal.

12. The driving method of claim 11 , further comprising:
storing the previous first image signal in a frame memory,
wherein the acquiring of the previous first image signal comprising reading the previous first image signal out from the frame memory.

13. The driving method of claim 11 , wherein the current first image signal includes a first color signal, a second color signal, and a third color signal that are sequentially input in turn.

14. The driving method of claim 13 , wherein the first, second and third color signals are reddish, bluish and greenish frame signals, respectively.

15. The driving method of claim 14 , wherein outputting the boosting signal comprises:
outputting the boosting signal to have a gradation level higher than that of the reddish frame signal when the current first image signal is the reddish frame signal;
outputting the boosting signal to have a gradation level lower than that of the bluish frame signal when the current first image signal is the bluish frame signal; and
outputting the boosting signal to have a gradation level higher than that of the greenish frame signal when the current first image signal is the greenish frame signal.

16. The driving method of claim 11 , wherein an output speed of the second image signal is two times faster than an input speed of the current first image signal.

17. A display device comprising:
a frame memory configured to store a previous first image signal input during a first period;
a boosting circuit configured to receive a current first image signal and the previous first image signal during a second period, and to sequentially output (i) a boosted image signal at a current frame to a data driver based on the current and previous first image signals as a second image signal and (ii) the current first image signal at a subsequent frame to the data driver as a subsequent second image signal;
a display panel including pixels; and
the data driver configured to generate data voltages from the second image signal for application to the pixels,
wherein a frequency of the second image signal is higher than a frequency of the first image signal.

18. The display device of claim 17 , wherein the current first image signal includes a reddish frame signal, a bluish frame signal, and a greenish frame signal that are input sequentially during one of three image frame periods, respectively.

19. The display device of claim 18 , wherein the second image signal is output during three image frame periods and the subsequent second image signal is output during a subsequent three image frame periods.

20. The display device of claim 18 , wherein the boosting signal has a luminance level higher than that of the reddish frame signal when the current first image signal is the reddish frame signal, the boosting signal has a luminance level lower than that of the bluish frame signal when the current first image signal is the bluish frame signal, and the boosting signal has a luminance level higher than that of the greenish frame signal when the current first image signal is the greenish frame signal.

Assignees

• Kim Jinpil
• Koh Jai-Hyun
• Kwon Se Ah
• Kim Heendol
• Ahn Kuk-Hwan
• Lee Iksoo
• Lim Namjae
• Samsung Display Co Ltd

Inventors

• Kim Jinpil
• Koh Jai-Hyun
• Kwon Se Ah
• Kim Heendol
• Ahn Kuk-Hwan
• Lee Iksoo
• Lim Namjae

Classifications

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G2310/0235

  Field-sequential colour display · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2340/16

  Determination of a pixel data signal depending on the signal applied in the previous frame · CPC title

• G09G3/3648 Primary

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