Display device, display method thereof, and display system

1. A display device, comprising:

at least two display screens;

a light transmission portion, configured to transmit image light emitted by the at least two display screens to a predetermined region,

wherein the at least two display screens or the light transmission portion is configured to be movable, so that distances from image planes imaged by the at least two display screens through the light transmission portion to the predetermined region can be adjusted independently,

the display device further comprises:

an eye tracker, configured to determine depth information of a fixation point of an eyeball by tracking a position of the eyeball, wherein the depth information is information about a distance from the fixation point to the eyeball in a viewing direction of the eyeball, the eyeball is located in the predetermined region; and

a controller, connected to the eye tracker and at least one of the display screens and the light transmission portion, and configured to receive the depth information of the fixation point to adjust distances from the at least two display screens to the light transmission portion, so that the fixation point is located on one of the image planes of the at least two display screens.

2. The display device according to claim 1 , wherein the controller is further configured to control the at least two display screens to display, so that a display resolution of the image plane where the fixation point is located is greater than a display resolution of the other of the image planes.

3. The display device according to claim 1 , wherein the eye tracker is further configured to determine plane information of the fixation point of the eyeball, the plane information is information about a position of the fixation point in the image plane where the fixation point is located, the controller is further configured to adjust a display resolution of the position of the fixation point in the image plane to be greater than a display resolution of a region outside the fixation point in the image plane, according to the plane information.

4. The display device according to claim 1 , wherein the light transmission portion comprises at least two first convex lenses and at least one transflective mirror, and each of the at least two first convex lenses is located between one of the at least two display screens and one transflective mirror.

5. The display device according to claim 4 , wherein the controller is configured to control the at least two display screens to move along an optical axis direction of the first convex lens relative to a corresponding first convex lens; or control the at least two first convex lenses to move along the optical axis of the first convex lens relative to a corresponding display screen.

6. The display device according to claim 5 , wherein each of the at least two display screens is located at a focal point or within a focal length of the corresponding first convex lens.

7. The display device according to claim 4 , wherein an angle between a principle plane of the at least one transflective mirror and a principle plane of the at least two display screens is 45 degrees.

8. The display device according to claim 4 , wherein the light transmission portion further comprises:

a light beam adjuster, located on a side of the at least one transflective mirror away from one of the at least two the first convex lenses, and configured to adjust a diameter of a light beam directed from the at least one transflective mirror to the eyeball so as to adapt to a pupil size of the eyeball.

9. The display device according to claim 8 , wherein the light beam adjuster comprises a second convex lens and a third convex lens, and an optical axis of the second convex lens and an optical axis of the third convex lens are on a same straight line; the optical axis of the second convex lens is on the same straight line as an optical axis of one of the at least two first convex lenses, and a center of the at least one transflective mirror is on the straight line.

10. The display device according to claim 4 , further comprising:

an aperture, located between the at least two display screens and the corresponding first convex lens, and all image light emitted by the display screen enters the first convex lens through the aperture.

11. A display method of a display device according to claim 1 , comprising:

adjusting the distances from the image planes imaged by the at least two display screens through the light transmission portion to the predetermined region, so that the eyeballs located in the predetermined region perceive a stereo image formed by images in different depths.

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

tracking a position of the eyeball to determine the depth information of the fixation point of the eyeball; and

adjusting the distances from the at least two display screens to the light transmission portion according to the depth information, so that the fixation point is located on one of the image planes of the at least two display screens.

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

adjusting a display resolution of the image plane where the fixation point is located to be greater than a display resolution of the other of the image planes according to the depth information.

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

tracking a position of the eyeball to determine plane information of the fixation point of the eyeball; and

adjusting a display resolution of the position of the fixation point in the image plane to be greater than a display resolution of a region outside the fixation point in the image plane according to the plane information.

15. The display device according to claim 4 , wherein a count of the at least two first convex lenses is the same as a count of the at least two display screens, and the at least two display screens and the at least two first convex lenses are in one-to-one correspondence.

16. The display device according to claim 15 , wherein a count of the at least two first convex lenses is one more than that of the at least one transflective mirror.

17. The display device according to claim 8 , wherein the light beam adjuster and at least one display screen are located on a same side of the at least one transflective mirror, and the light beam adjuster and one display screen are located on two sides of the at least one transflective mirror.

18. A display system comprising: two display devices, each of the two display devices comprises at least two display screens;

a light transmission portion, configured to transmit image light emitted by the at least two display screens to a predetermined region,

wherein the at least two display screens or the light transmission portion is configured to be movable, so that distances from image planes imaged by the at least two display screens through the light transmission portion to the predetermined region can be adjusted independently,

wherein the at least two display screens in one of the two display devices and the at least two display screens in the other of the two display devices are in one-to-one correspondence, image planes of two corresponding display screens respectively located in the two display devices are in a same depth of field, and the two display devices are configured to correspond to two eyes respectively to achieve binocular stereoscopic display.