Near-eye microlens array display having diopter detection device

1. A near-eye display, comprising a human eye-oriented display screen, a microlens array located on the side of the display screen close to human eyes, and an image adjustment unit, wherein

the display screen has a plurality of display regions that are separate from each other, each display region correspondingly displays a subimage, and the subimages displayed on the display regions is combined as a complete, gap-free and overlap-free image to be presented to a user;

the microlens array focuses the image displayed on the display screen into a near-eye image that can be clearly seen by human eyes, each microlens being corresponding to one of the display region; and

the image adjustment unit adjusts in real time size of the displayed image of each display region according to a visual acuity state of the user, so that each display region displays a larger single subimage when a human eye has a short focal length, and each display region displays a smaller single subimage when a human eye has a long focal length, and/or

the image adjustment unit moves in real time the position of each display region according to a gaze direction of the user, so that the subimage displayed on each display region can be refracted into the human eye through the microlens array regardless of the gaze direction of the user;

wherein the image adjustment unit comprises a human-eye gaze direction detection unit configured to detect in real time a gaze direction of a human eye and a calibration unit configured to perform the following steps of calibrations for a displayed image size parameter of the display region corresponding to different gaze angles:

a) guiding, by using the calibration unit, the user to focus both eyes to watch a farthest part and a nearest part of a calibration image, the farthest part and the nearest part being used as two calibration positions;

b) detecting, at the two calibration positions, gaze directions of left and right eyes of the user by using the human-eye gaze direction detection unit, to determine whether a position to which the user pays attention has reached the two calibration positions;

c) at the two calibration positions, respectively sending a request for requesting the user to determine whether there is an image gap or overlap, receiving feedback information, and making the following judgments: if determining according to a feedback that there is a gap between the image and surrounding images, increasing a number of pixel units in a display region at each of the calibration positions, and recording a value at this moment and if determining according to a feedback that there is an overlap between the image and surrounding images, reducing the number of pixel units in the corresponding display region that participate in displaying of the image at a distance, and recording a value; and

d) obtaining, through calculation according to the two end values, displayed image sizes of the display region that correspond to other gaze angles.

2. The near-eye display according to claim 1 , wherein the gaze direction detection unit comprises an eye tracker configured to determine in real time the gaze direction of the user according to a received beam that is reflected from the pupil of an eye of the user.

3. The near-eye display according to claim 1 , wherein the image adjustment unit performs in real time the following steps of adjustments:

a) determining a gaze angle between human eyes by using the human-eye gaze direction detection unit; and

b) adjusting the size of displayed image of the display regions corresponding to each gaze angle:

when determining that the user is under a near-sighted gaze angle, the image adjustment unit instructs each display region on the display screen to consistently increase the number of pixel units to be displayed; or

when determining that the user is under a far-sighted gaze angle, the image adjustment unit instructs each display region on the display screen to consistently reduce the number of pixel units to be displayed.

4. The near-eye display according to claim 1 , wherein the image adjustment unit comprises a visual acuity state detection unit configured to detect in real time a focal length of a human eye.

5. The near-eye display according to claim 4 , wherein the image adjustment unit performs in real time the following steps of adjustments:

a) determining, by using the visual acuity state detection unit, that the user is in a certain visual acuity state;

b) adjusting the size of the displayed image of the display regions corresponding to visual acuity states:

when determining that the user is in a near-sighted visual acuity state, the image adjustment unit instructs each display region on the display screen to consistently increase the number of pixel units to be displayed; or

when determining that the user is in a far-sighted visual acuity state, the image adjustment unit instructs each display region on the display screen to consistently reduce the number of pixel units to be displayed.

6. The near-eye display according to claim 1 , wherein the near-eye display is located on one side of human eyes, and reflects the image to human eyes by using a reflecting mirror disposed in front of human eyes.

7. The near-eye display according to claim 6 , wherein the reflecting mirror is a semi-transmissive semi-reflective mirror.

8. A near-eye display, comprising a human eye-oriented display screen, a microlens array located on the side of the display screen close to human eyes, and an image adjustment unit, wherein

the display screen has a plurality of display regions that are separate from each other, each display region correspondingly displays a subimage, and the subimages displayed on the display regions is combined as a complete, gap-free and overlap-free image to be presented to a user;

the microlens array focuses the image displayed on the display screen into a near-eye image that can be clearly seen by human eyes, each microlens being corresponding to one of the display region; and

the image adjustment unit adjusts in real time size of the displayed image of each display region according to a visual acuity state of the user, so that each display region displays a larger single subimage when a human eye has a short focal length, and each display region displays a smaller single subimage when a human eye has a long focal length, and/or

the image adjustment unit moves in real time the position of each display region according to a gaze direction of the user, so that the subimage displayed on each display region can be refracted into the human eye through the microlens array regardless of the gaze direction of the user;

wherein the image adjustment unit comprises a visual acuity state detection unit configured to detect in real time a focal length of a human eye and a calibration unit configured to perform the following steps of calibrations for a displayed image size parameter of the display region corresponding to different focal lengths:

a) guiding, by using the calibration unit, the user to focus both eyes to watch a farthest part and a nearest part of a calibration image, the farthest part and the nearest part being used as two calibration positions;

b) respectively detecting, at the two calibration positions, focal lengths of human eyes by using the visual acuity state detection unit; and

c) obtaining, through calculation according to the two end values, displayed image sizes of the display region that correspond to other focal lengths.