Display device and method of adjusting luminance of a logo region of an image displayed on the same

Patent metadata

Field	Value
Publication number	US-9691353-B2
Application number	US-201514793554-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Feb 3, 2015
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A display device and method of adjusting luminance of a logo region of an image displayed on the same are disclosed. In one aspect, the display device includes a display panel configured to display an image including a logo region and a display driving integrated circuit configured to detect a logo estimate region of the image and determine a logo surrounding region that surrounds the logo estimate region. The integrated circuit is further configured to analyze a histogram of the logo surrounding region so as to determine a background maximum luminance, determine a high-gray-scale maximum luminance of the logo estimate region based on the background maximum luminance and adjust a gamma curve of the logo estimate region.

First claim

What is claimed is:

1. A display device, comprising:
a display panel configured to display an image including a logo region; and
a display driving integrated circuit configured to drive the display panel,
wherein the display driving integrated circuit is further configured to:
detect a logo estimate region of the image that surrounds the logo region of the image;
determine a logo surrounding region of the image that surrounds the logo estimate region of the image;
analyze a histogram of the logo surrounding region of the image so as to determine a background maximum luminance of the logo surrounding region of the image;
determine a high-gray-scale maximum luminance of the logo estimate region of the image based at least in part on the background maximum luminance of the logo surrounding region of the image; and
adjust a gamma curve of the logo estimate region of the image to control luminance of an entire gray-scale range of the gamma curve of the logo estimate region of the image so as to be less than the high-gray-scale maximum luminance of the logo estimate region of the image.

2. The display device of claim 1 , wherein the logo estimate region of the image has: i) a height that is greater than or equal to a maximum height of the logo region of the image and ii) a width that is greater than or equal to a maximum width of the logo region of the image.

3. The display device of claim 1 , wherein the display driving integrated circuit is further configured to determine the background maximum luminance of the logo surrounding region of the image to be a maximum luminance of a single color of the logo surrounding region of the image when the logo surrounding region of the image includes only the single color.

4. The display device of claim 1 , wherein the display driving integrated circuit is further configured to determine the background maximum luminance of the logo surrounding region of the image to be the greatest luminance among a maximum luminance of a red color, a maximum luminance of a green color, and a maximum luminance of a blue color of the logo surrounding region of the image when the logo surrounding region of the image has multiple colors including the red color, the green color, and the blue color.

5. The display device of claim 1 , wherein the display driving integrated circuit is further configured to determine the high-gray-scale maximum luminance of the logo estimate region of the image within a predetermined range with respect to the background maximum luminance of the logo surrounding region of the image.

6. The display device of claim 5 , wherein the display driving integrated circuit is further configured to reduce luminance of a high-gray-scale range that is greater than a predetermined gray-scale on the gamma curve of the logo estimate region of the image.

7. The display device of claim 6 , wherein the display driving integrated circuit is further configured to increase luminance of a low-gray-scale range that is less than the predetermined gray-scale on the gamma curve of the logo estimate region of the image.

8. The display device of claim 5 , wherein the display driving integrated circuit is further configured to adjust a gamma curve of the logo surrounding region of the image based at least in part on a high-gray-scale maximum luminance of the logo surrounding region of the image when the display driving integrated circuit adjusts the gamma curve of the logo estimate region of the image.

9. The display device of claim 8 , wherein the display driving integrated circuit is further configured to:
determine the high-gray-scale maximum luminance of the logo surrounding region of the image to be greater than the high-gray-scale maximum luminance of the logo estimate region of the image; and
increase the high-gray-scale maximum luminance of the logo surrounding region of the image as the distance from the logo estimate region of the image increases.

10. The display device of claim 5 , wherein the display driving integrated circuit is further configured to selectively adjust the high-gray-scale maximum luminance of the logo estimate region of the image based at least in part on the area of the logo estimate region of the image.

11. The display device of claim 10 , wherein the display driving integrated circuit is further configured to increase the high-gray-scale maximum luminance of the logo estimate region of the image as the size of the logo estimate region of the image increases.

12. The display device of claim 10 , wherein the display driving integrated circuit is further configured to not adjust the high-gray-scale maximum luminance of the logo estimate region of the image when the size of the logo estimate region of the image is less than a predetermined low-limit size.

13. The display device of claim 10 , wherein the display driving integrated circuit is further configured to set the high-gray-scale maximum luminance of the logo estimate region of the image to be a maximum value supported by the display panel when the size of the logo estimate region of the image is greater than a predetermined high-limit size.

14. The display device of claim 1 , wherein the display driving integrated circuit comprises:
a scan driver configured to provide a plurality of scan signals to the display panel;
a data driver configured to provide a plurality of data signals to the display panel;
a logo controller configured to adjust the gamma curve of the logo estimate region of the image; and
a timing controller configured to control the scan driver, the data driver, and the logo controller.

15. The display device of claim 14 , wherein the logo controller is located inside the timing controller or outside of the timing controller and wherein the logo controller is configured to communicate with the timing controller.

16. A method of adjusting image luminance for a display device, the method comprising:
displaying, at a display panel, an image including a logo region;
detecting, at a display driving integrated circuit, a logo estimate region of the image that surrounds the logo region of the image;
determining, at a display driving integrated circuit, a logo surrounding region of the image that surrounds the logo estimate region of the image;
detecting, at a display driving integrated circuit, a background maximum luminance of the logo surrounding region of the image via analyzing a histogram of the logo surrounding region of the image;
determining, at a display driving integrated circuit, a high-gray-scale maximum luminance of the logo estimate region of the image based at least in part on the background maximum luminance of the logo surrounding region of the image; and
adjusting, at a display driving integrated circuit, a gamma curve of the logo estimate region of the image so as to control luminance of an entire gray-scale range of the gamma curve of the logo estimate region of the image to be less than the high-gray-scale maximum luminance of the logo estimate region of the image.

17. The method of claim 16 , wherein the logo estimate region of the image has a height that is greater than or equal to a maximum height of the logo region of the image and a width that is greater than or equal to a maximum width of the logo region of the image.

18. The method of claim 16 , further comprising determining the background maximum luminance of the logo surrounding region of the image to be a maximum luminance of a single color of the logo surrounding region of the image when the logo surrounding region of the image includes only the single col

Assignees

• Samsung Display Co Ltd

Inventors

• Joo Mi-Young
• Park Seung-Ho
• Lee Kang-Hee
• Han Myung-Hee

Classifications

• G06V10/56

  relating to colour · CPC title

• G06V10/50

  by performing operations within image blocks; by using histograms, e.g. histogram of oriented gradients [HoG]; by summing image-intensity values; Projection analysis · CPC title

• G06K9/46

  Physics · mapped topic

• G09G5/10 Primary

  Intensity circuits · CPC title

• G06K2009/4666

  Physics · mapped topic