Display device, method for driving the same, and head-mounted display apparatus
A display device includes a driving frequency calculator configured to divide output image data into central, intermediate, and peripheral images respectively corresponding to central, intermediate, and peripheral visual field regions, calculate spatial frequencies of the central image, the intermediate image, and the peripheral image, calculate critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the spatial frequencies and based on viewing angles of the central visual field region, the intermediate visual field region, and the peripheral visual field region, and determine driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the critical flicker frequencies, and a display panel configured to display an image based on the output image data and based on the driving frequencies.
1. A display device comprising:
a driving frequency calculator configured to:
divide output image data into a central image, an intermediate image, and a peripheral image respectively corresponding to a central visual field region, an intermediate visual field region, and a peripheral visual field region;
calculate spatial frequencies of the central image, the intermediate image, and the peripheral image;
calculate critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the spatial frequencies and based on viewing angles of the central visual field region, the intermediate visual field region, and the peripheral visual field region; and
determine driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the critical flicker frequencies; and
a display panel configured to display an image based on the output image data and based on the driving frequencies.
2. The display device of claim 1 , wherein the output image data comprises input image data on which foveated rendering is performed.
3. The display device of claim 1 , further comprising a visual field tester configured to measure the central visual field region, the intermediate visual field region, and the peripheral visual field region through a visual field test.
4. The display device of claim 3 , wherein the visual field tester is configured to:
set a region comprising a gaze point as the central visual field region;
set a region surrounding the central visual field region as the intermediate visual field region; and
set a region excluding the central visual field region and the intermediate visual field region, among an entire visual field region, as the peripheral visual field region.
5. The display device of claim 1 , wherein the spatial frequencies are calculated by performing fast Fourier transform (FFT) on the central image, the intermediate image, and the peripheral image.
6. The display device of claim 1 , wherein a spatial frequency of the peripheral image is less than a spatial frequency of the central image.
7. The display device of claim 1 , wherein the critical flicker frequencies are calculated by using a temporal contrast sensitivity function.
8. The display device of claim 1 , wherein the driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region are greater than or equal to the critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region, respectively.
9. The display device of claim 1 , further comprising a renderer configured to convert input image data into the output image data by performing foveated rendering on the input image data.
10. A method for driving a display device, the method comprising:
dividing output image data into a central image, an intermediate image, and a peripheral image respectively corresponding to a central visual field region, an intermediate visual field region, and a peripheral visual field region;
calculating spatial frequencies of the central image, the intermediate image, and the peripheral image;
calculating critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the spatial frequencies and based on viewing angles of the central visual field region, the intermediate visual field region, and the peripheral visual field region;
determining driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the critical flicker frequencies; and
displaying an image based on the output image data and based on the driving frequencies.
11. The method of claim 10 , further comprising generating the output image data by performing foveated rendering on input image data.
12. The method of claim 10 , further comprising measuring the central visual field region, the intermediate visual field region, and the peripheral visual field region through a visual field test.
13. The method of claim 10 , further comprising:
setting a region comprising a gaze point as the central visual field region;
setting a region surrounding the central visual field region as the intermediate visual field region; and
setting a region excluding the central visual field region and the intermediate visual field region, among an entire visual field region, as the peripheral visual field region.
14. The method of claim 10 , wherein the spatial frequencies are calculated by performing fast Fourier transform (FFT) on the central image, the intermediate image, and the peripheral image.
15. The method of claim 10 , wherein a spatial frequency of the peripheral image is less than a spatial frequency of the central image.
16. The method of claim 10 , wherein the critical flicker frequencies are calculated by using a temporal contrast sensitivity function.
17. The method of claim 10 , wherein the driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region are greater than or equal to the critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region, respectively.
18. The method of claim 10 , further comprising converting input image data into the output image data by performing foveated rendering on the input image data.
19. A head-mounted display apparatus comprising:
a processor configured to convert input image data into output image data; and
a display device configured to display an image based on the output image data, and comprising:
a driving frequency calculator configured to:
divide the output image data into a central image, an intermediate image, and a peripheral image respectively corresponding to a central visual field region, an intermediate visual field region, and a peripheral visual field region;
calculate spatial frequencies of the central image, the intermediate image, and the peripheral image;
calculate critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the spatial frequencies and based on viewing angles of the central visual field region, the intermediate visual field region, and the peripheral visual field region; and
determine driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the critical flicker frequencies; and
a display panel configured to display the image based on the output image data and based on the driving frequencies.
20. The head-mounted display apparatus of claim 19 , wherein the processor is configured to generate the output image data by performing foveated rendering on the input image data.