Near-eye display module releasing the eye's focus from fixed plane

Patent metadata

Field	Value
Publication number	US-11575881-B2
Application number	US-202117535713-A
Country	US
Kind code	B2
Filing date	Nov 26, 2021
Priority date	Nov 26, 2020
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

The invention discloses a near-eye display module which includes at least one projection module, a bracing structure, and a control unit, releasing the eye's focus from a fixed plane. A projection module consists of more than one projection units, and the bracing structure functions as a holder for these projection units. A projection unit includes a display panel, a converging device which converges the light beams incident onto or outgoing from the display panel, and a deflection aperture which deflects the light coming from the converging device. The viewer wears two such near-eye display modules as eye-glasses. In the near-eye display module corresponding to an eye, the projection units of a same projection module jointly project at least one whole image to this eye, for VAC-free (Convergence-Accommodation conflict-free) three dimensional (3D) display based on Maxwellian view or multiple-images-one-eye.

First claim

What is claimed is:

1. A near-eye display module releasing eye's focus from a fixed plane, comprising:
at least one projection module, which is constructed by a plurality of separated distributed projection units, wherein each of the projection units comprises a display panel, a converging device, and a deflection aperture in a mutual corresponding relationship;
wherein, the display panel comprises a plurality of pixels for optical information display, the converging device converges a light incident onto or outgoing from the corresponding display panel, and the deflection aperture deflects the incident light from the corresponding converging device;
a bracing structure, to hold the display panels, the converging devices and the deflection apertures of the at least one projection module;
a control unit, which is with signal connection to the display panels and refreshes the display panels with optical information,
wherein, a loading information of each pixel is the projection message of a 3D scene to be displayed, along a line connecting the corresponding deflection aperture with the pixel's image on the corresponding deflection aperture, or along a line connecting the corresponding deflection aperture with the pixel's image on the corresponding converging device and the corresponding deflection aperture;
the near-eye display module is designed such that a bracing structure holding the deflection apertures is placed near to an eye of a viewer as an eyepiece, with a vertical projection of each of the deflection aperture on a plane perpendicular to an eye's viewing direction being less than 2.5 mm along all directions;
and, all the display panels' images on the corresponding deflection aperture, or on the corresponding converging device and the corresponding deflection aperture, of a same projection module jointly cover a field of view of the 3D scene to be displayed, and at least a whole image with the field of view is projected into a pupil of the eye.

2. The near-eye display module releasing the eye's focus from the fixed plane according to claim 1 , wherein the converging device of each of the projection unit is a lens, or a phase element with lens function.

3. The near-eye display module releasing the eye's focus from the fixed plane according to claim 1 , wherein the converging device of a projection unit is a microstructure array, whose microstructure elements correspond to the pixels of the corresponding display panel by a one-to-one manner, with each of the microstructure element guiding a light beam incident onto or outgoing from the corresponding pixel to the deflection aperture of the projection unit.

4. The near-eye display module releasing the eye's focus from the fixed plane according to claim 1 , wherein the display panels are back-lit display panels, and the projection unit comprises a backlight module for providing backlight.

5. The near-eye display module releasing the eye's focus from the fixed plane according to claim 4 , wherein the backlight module of each of the projection unit is an optical waveguide structure.

6. The near-eye display module releasing the eye's focus from the fixed plane according to claim 4 , wherein the deflection aperture of the projection unit is replaced by K sub-deflection apertures;
and, the backlight module of the projection unit projects K backlights sequentially at K time-points of a time period, with the K backlights converging to K sub-deflection apertures of the projection unit, respectively, through modulation of the converging device;
wherein, at a time-point, the corresponding sub-deflection aperture of each pixel is the sub-deflection aperture to which the light beam from the pixel converges at the time-point, and the loading information of each pixel is the projection message of the 3D scene to be displayed along a line connecting the corresponding sub-deflection aperture with the pixel's image on the corresponding sub-deflection aperture, or along the line connecting the corresponding sub-deflection aperture with the pixel's image on the corresponding sub-deflection aperture and the corresponding converging device; wherein K≥2.

7. The near-eye display module releasing the eye's focus from the fixed plane according to claim 6 , wherein each sub-deflection aperture allows the incident light to be deflected through only at the time-points when the corresponding backlight is projected.

8. The near-eye display module releasing the eye's focus from the fixed plane according to claim 4 , wherein each pixel of the display panel is composed of L sub-pixels which emit light of L different primary colors, respectively, and each deflection aperture is replaced by L sub-deflection apertures;
and, the backlight module of the projection unit projects L backlights of the L primary colors, with the L backlights being guided to the L sub-deflection apertures of the projection unit in a one-to-one manner;
wherein, the corresponding sub-deflection aperture of the sub-pixel is the sub-deflection aperture to which the light from the sub-pixel converges, and the loading information of the sub-pixel is the projection message with the corresponding primary color of the 3D scene to be displayed along the line connecting the corresponding sub-deflection aperture with the sub-pixel's image on corresponding sub-deflection aperture, or along the line connecting the corresponding sub-deflection aperture with the sub-pixel's image on the corresponding converging device and the corresponding deflection aperture; wherein L≥2.

9. The near-eye display module releasing the eye's focus from the fixed plane according to claim 8 , wherein for each sub-deflection aperture, its emission ratio to light of a corresponding primary color is at least 9 times of that to light of non-corresponding primary colors.

10. The near-eye display module releasing the eye's focus from the fixed plane according to claim 1 , wherein deflection apertures of adjacent projection units are respectively designed with different orthogonal characteristics, and for each deflection aperture, its emission ratio to light of a corresponding orthogonal characteristic from the corresponding display panel is at least 9 times of that to light of non-corresponding orthogonal characteristics.

11. The near-eye display module releasing the eye's focus from the fixed plane according to claim 10 , wherein the orthogonal characteristics are timing characteristics which respectively allow the incident light to be deflected through at different time-points of a time period, or linear-polarization characteristics which respectively allow lights of mutual perpendicular polarization directions to be deflected through, or rotational-polarization characteristics which respectively allowing left-handed light or right-handed light to be deflected through, or a combination thereof.

12. The near-eye display module releasing the eye's focus from the fixed plane according to claim 11 , wherein the control unit is with signal connection to the deflection apertures for controlling the deflection apertures to be turned on or turned off.

13. The near-eye display module releasing the eye's focus from the fixed plane according to claim 6 , wherein the sub-deflection apertures corresponding to adjacent projection units are endowed with different orthogonal characteristics, and for each sub-deflection aperture, an emission ratio to light of a corresponding orthogonal characteristic from the corresponding display panel is at least 9 times of that to light of non-corresponding orthogonal characteristics.

14. The near-eye display module releasing the eye's focus from the fixed plane accordin

Assignees

• Univ Sun Yat Sen

Inventors

• Teng Dongdong
• Liu Lilin

Classifications

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• H04N13/344

  with head-mounted left-right displays · CPC title

• G02B2027/0134

  of stereoscopic type · CPC title

• H04N13/332 Primary

  Displays for viewing with the aid of special glasses or head-mounted displays [HMD] · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title