Display device and method for controlling the same

Patent metadata

Field	Value
Publication number	US-10475368-B2
Application number	US-201615299624-A
Country	US
Kind code	B2
Filing date	Oct 21, 2016
Priority date	Oct 21, 2015
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A display device is provided, which includes a display, a ditherer configured to perform dithering of video data displayed on the display, an illumination sensor configured to sense illumination around the display device, and a processor configured to control driving of the ditherer on the basis of a grayscale level of the video data if or when the sensed illumination is lower than a predetermined value.

First claim

What is claimed is:

1. A display device, comprising:
a display comprising a plurality of Light Emitting Diodes (LEDs);
an illumination sensor configured to sense illumination around the display device; and
a processor configured to, based on an image being received, control the display to display the image by performing dithering based on the sensed illumination around the display device and a grayscale level of the image,
wherein the processor is configured to:
based on the sensed illumination around the display device being lower than a predetermined value, identify at least one area with a grayscale level being lower than a predetermined level from among a plurality of areas of the image,
control the display to display the image using at least one LED corresponding to the identified area without performing the dithering, and
control the display to display the image by performing the dithering using remaining LED among the plurality of LEDs.

2. The display device as claimed in claim 1 , wherein the processor is configured to, based on a grayscale level corresponding to a first area of the image being lower than the predetermined level, turn off voltage for a dithering block corresponding to the first area of the image.

3. The display device as claimed in claim 1 , wherein the processor is configured to, based on an average grayscale level of the image being lower than the predetermined level, turn off voltage for each of a plurality of dithering blocks corresponding to the plurality of areas of the image.

4. The display device as claimed in claim 1 , wherein the processor is configured to, based on a grayscale level corresponding to a first area of the image being lower than the predetermined level, reduce a dithering value of a dithering block corresponding to the first area of the image for a predetermined value or less.

5. The display device as claimed in claim 4 , further comprising a storage configured to correlate and store the dithering value in accordance with a change of the grayscale level,
wherein the processor is configured to perform the dithering in accordance with the dithering value correlated with the grayscale level.

6. The display device as claimed in claim 1 , wherein the processor is configured to, based on an average grayscale level of the image being lower than the predetermined level, reduce a dithering value of each of a plurality of dithering blocks corresponding to the plurality of areas of the image for a predetermined value or less.

7. The display device as claimed in claim 6 , further comprising a storage configured to correlate and store the dithering value in accordance with a change of the grayscale level,
wherein the processor is configured to perform the dithering in accordance with the dithering value correlated with the grayscale level.

8. The display device as claimed in claim 7 , wherein the storage is configured to store a table in which the grayscale level and the dithering value are correlated where the dithering value is reduced as the grayscale level is reduced, and
wherein the processor is configured to perform the dithering using the table.

9. The display device as claimed in claim 1 , wherein the processor is configured to, based on the sensed illumination being equal to or higher than the predetermined value, perform the dithering using a dithering value of each of a plurality of dithering blocks corresponding to the plurality of areas of the image.

10. A method for controlling a display device, comprising:
sensing illumination around the display device comprising a plurality of Light Emitting Diodes (LEDs);
based on the sensed illumination around the display device being lower than a predetermined value, identify at least one area with a grayscale level being lower than a predetermined level from among a plurality of areas of an image;
displaying the image using at least one LED corresponding to the identified area without performing dithering; and
displaying the image by performing the dithering using remaining LED among the plurality of LEDs.

11. The method as claimed in claim 10 , wherein the performing dithering comprises, based on a grayscale level corresponding to a first area being lower than the predetermined level, turning off voltage for a dithering block corresponding to the first area of the image.

12. The method as claimed in claim 10 , wherein the performing dithering comprises, based on an average grayscale being lower than the predetermined level, turning off voltage for each of a plurality of dithering blocks corresponding to the plurality of areas of the image.

13. The method as claimed in claim 10 , wherein the performing dithering comprises, based on a grayscale level corresponding to a first area being lower than the predetermined level, reducing a dithering value of a dithering block corresponding to the first area of the image.

14. The method as claimed in claim 13 , wherein the performing dithering comprises performing the dithering in accordance with a dithering value correlated with the grayscale level among dithering values correlated with the grayscale level and pre-stored in accordance with a change of the grayscale level.

15. The method as claimed in claim 14 , wherein the performing dithering comprises performing the dithering using a pre-stored table correlated to lower the dithering value in accordance with lowering of the grayscale level.

16. The method as claimed in claim 10 , wherein the performing dithering comprises, based on an average grayscale level being lower than the predetermined level, reducing a dithering value of each of a plurality of dithering blocks corresponding to the plurality of areas of the image.

17. The method as claimed in claim 16 , wherein the performing dithering comprises performing the dithering in accordance with the dithering value correlated with the grayscale level among dithering values correlated with the grayscale level and pre-stored in accordance with a change of the grayscale level.

18. The method as claimed in claim 17 , wherein the performing dithering comprises performing the dithering using a pre-stored table correlated to reduce the dithering value in accordance with reduction of the grayscale level.

19. The method as claimed in claim 10 , wherein the performing dithering comprises performing the dithering using a dithering value of each of a plurality of dithering blocks corresponding to the plurality of areas of the image based on the sensed illumination being equal to or higher than the predetermined value.

20. A non-transitory computer readable storage storing a method for controlling a display device, the method comprising:
sensing illumination around the display device comprising a plurality of Light Emitting Diodes (LEDs);
based on the sensed illumination around the display device being lower than a predetermined value, identify at least one area with a grayscale level being lower than a predetermined level from among a plurality of areas of an image;
displaying the image using at least one LED corresponding to the identified area without performing dithering; and
displaying the image by performing the dithering using remaining LED among the plurality of LEDs.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Ji-Yong
• Cho Young-Hoon
• Im Sang-Kyun

Classifications

• G09G3/2044 Primary

  using dithering · CPC title

• G09G2320/0233

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

• G09G2360/144

  the light being ambient light · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title