Image processor, display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-9466237-B2
Application number	US-201414447495-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Dec 23, 2013
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

An image processing controller, a display device including the image processing controller and a driving method of the display device are disclosed. In one aspect, the method includes receiving an image signal and gamma correcting the image signal into at least one main area image signal. The method also includes interpolating the main area image signal into a boundary area image signal. The method further includes dithering the main area image signal and the boundary area image signal into a data signal and providing the data signal to a display panel.

First claim

What is claimed is:

1. A method of driving a display device, comprising:
receiving an image signal;
gamma correcting the image signal into at least one main area image signal;
interpolating the gamma corrected main area image signal into a boundary area image signal;
dithering the main area image signal and the boundary area image signal into a data signal; and
providing the data signal to a display panel.

2. The method of claim 1 , wherein the main area image signal comprises first and second main area image signals respectively corresponding to first and second main areas of the display panel.

3. The method of claim 2 , wherein at least one boundary area is interposed between the first and second main areas.

4. The method of claim 3 , wherein the boundary area image signal is displayed on the boundary area.

5. The method of claim 4 , wherein the interpolating comprises:
performing cosine interpolation based on the first and second main area image signals and a distance between the first main area and the boundary area.

6. The method of claim 5 , wherein the performing of the cosine interpolation comprises:
calculating the boundary area image signal (RGBB) based on the following equation:

RGBB
=

m
⁢

⁢
1

+

(

m
⁢

⁢
2

-

m
⁢

⁢
1

)

×

[

1
-

cos
⁡

(

k
×
π

m
⁢

⁢
2

-

m
⁢

⁢
1

)

]

2

wherein m 1 indicates the first main area image signal, m 2 indicates the second main area image signal, and k indicates the distance between the first main area and the boundary area.

7. The method of claim 1 , further comprising delaying the main area image signal into a delayed main area image signal.

8. The method of claim 7 , wherein the dithering comprises dithering the delayed main area image signal and the boundary area image signal into the data signal as a dithering result.

9. An image processor, comprising:
an input buffer configured to receive an image signal and output an intermediate image signal corresponding to at least one main area of a display panel;
a gamma correction unit configured to perform a gamma correction on the intermediate image signal so as to generate a main area image signal;
an interpolator configured to interpolate the main area image signal generated by the gamma correction unit so as to generate a boundary area image signal; and
a dithering unit configured to dither the main area image signal and the boundary area image signal into a data signal.

10. The image processor of claim 9 , further comprising:
a delay unit configured to delay the main area image signal and output a delayed main area image signal,
wherein the dithering unit is further configured to dither the delayed main area image signal and the boundary area image signal.

11. The image processor of claim 9 , wherein the main area image signal comprises first and second main area image signals respectively corresponding to first and second main areas.

12. The image processor of claim 11 , wherein a boundary area is at the boundary of the first and second main areas.

13. The image processor of claim 12 , wherein the boundary area image signal is configured to be displayed on the boundary area.

14. The image processor of claim 13 , wherein the interpolator is further configured to perform cosine interpolation based on the first and second main area image signals and a distance between the first main area and the boundary area.

15. The image processor of claim 14 , wherein the interpolator is further configured to calculate the boundary area image signal (RGBB) based on the following equation:

RGBB
=

m
⁢

⁢
1

+

(

m
⁢

⁢
2

-

m
⁢

⁢
1

)

×

[

1
-

cos
⁡

(

k
×
π

m
⁢

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Gigeun
• Kim Ahreum
• Baek Yunki
• Jang Yongjun

Classifications

• G09G3/2044 Primary

  using dithering · CPC title

• G09G2320/0673

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

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2320/0686

  with two or more screen areas displaying information with different brightness or colours · CPC title

• G09G2320/0276

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