Method and computer-readable medium for displaying image, and display device

1. An image display method, comprising:

acquiring an image for display in an n th frame on a display screen,

detecting a first sub-image and a second sub-image within the image, a resolution of the first sub-image being higher than a resolution of the second sub-image,

comparing the first sub-image in the n th frame with a corresponding sub-image in an (n−1) th frame, and

refreshing a localized area of the display screen positionally corresponding to the first sub-image to display an interpolated sub-image in the localized area;

wherein when a difference between positions of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame is equal to or higher than a predetermined threshold value, the interpolated sub-image is the sub-image in the (n−1) th frame, and

wherein when a difference between positions of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame is below the predetermined threshold value, the interpolated sub-image is an overlapped portion of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame.

2. The image display method according to claim 1 , further comprising:

before acquiring the image for display in the n th frame, detecting a gaze area on the display screen centered on a gaze point of a user, and

generating the image for display in the n th frame based on the detected gaze area on the display screen.

3. The image display method according to claim 2 , further comprising:

after generating the image for display in the n th frame, storing first image data for the first sub-image, and setting brightness for a backlight based on second image data for the second sub-image.

4. The image display method according to claim 2 , further comprising:

determining whether to perform interpolation based on a difference between a position of the detected gaze area for the n th frame and a position of a gaze area detected for the (n−1) th frame.

5. The image display method according to claim 4 , further comprising: if interpolation is not to be performed, mapping first image data for the first sub-image and second image data for the second sub-image onto pixels on a display device, and

if interpolation is to be performed, combining the first image data with image data for the corresponding sub-image in the (n−1) th frame to produce image data for the interpolated sub-image.

6. The image display method according to claim 5 , further comprising:

if interpolation is to be performed, performing localized refreshing of the image data for the first sub-image in the localized area to display the interpolated sub-image, and displaying the second sub-image to have the same content as in the (n−1) th frame.

7. The image display method according to claim 1 , wherein the refreshing of the localized area comprises selectively activating gate lines for driving the localized area.

8. The image display method according to claim 1 , wherein the interpolated sub-image is dimensioned to be the same as the first sub-image.

9. The image display method according to claim 7 , wherein during the refreshing of the localized area, gate lines for driving areas outside of the localized area are not activated.

10. The image display method according to claim 1 , further comprising:

before displaying the interpolated sub-image, determining a backlight brightness value for the display screen to display the interpolated sub-image.

11. The image display method according to claim 10 , further comprising:

after determining the backlight brightness value and before displaying the interpolated sub-image, mapping the interpolated sub-image to respective pixels of the display screen.

12. The image display method according to claim 11 , further comprising:

after mapping the interpolated sub-image and before displaying the interpolated sub-image, determining a grayscale value for each of the mapped pixels in accordance with the determined backlight brightness value.

13. The image display method according to claim 1 , further comprising:

before displaying the interpolated sub-image, determining display coordinates of the first sub-image and the second sub-image on the display screen based on respective pixel coordinates in the first and second sub-image.

14. A non-transitory computer-readable medium storing a program that, when executed by a computer, performs the image display method according to claim 1 .

15. A display system, comprising:

a non-transitory memory, and

a processor coupled to the non-transitory memory, the processor being configured to perform the image display method according to claim 1 .

16. A display device, comprising:

an image retriever configured to acquire an image for display in an n th frame on a display screen, and detect a first sub-image and a second sub-image within the image, a resolution of the first sub-image being higher than a resolution of the second sub-image,

an interpolator configured to determine an interpolated sub-image by comparing the first sub-image in the n th frame with a corresponding sub-image in an (n−1) th frame, and

a display configured to refresh a localized area of the display screen positionally corresponding to the first sub-image to display the interpolated sub-image in the localized area;

wherein when a difference between positions of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame is equal to or higher than a predetermined threshold value, the interpolated sub-image is the sub-image in the (n−1) th frame, and

wherein when a difference between positions of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame is below the predetermined threshold value, the interpolated sub-image is an overlapped portion of the first sub-image in the n th frame and the corresponding sub-image in the (n−1) th frame.

17. The display device according to claim 16 , wherein the display is further configured to selectively activate gate lines for driving the localized area to display the interpolated sub-image in the localized area.

18. The display device according to claim 16 ,

wherein the display comprises a backlight calculator, a mapper, and a grayscale compensator, and

wherein the backlight calculator is configured to, before the interpolated sub-image is displayed, determine a backlight brightness value for the display screen to display the interpolated sub-image.