Method and system for near-eye three dimensional display

Patent metadata

Field	Value
Publication number	US-10215983-B2
Application number	US-201715651487-A
Country	US
Kind code	B2
Filing date	Jul 17, 2017
Priority date	Jul 19, 2016
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A 3D near eye display device is provided, the display device comprising a display screen for displaying more than one 2D images, at least one focusing element for collimating the images to sub-images, a spatial multiplexing unit capable of remapping the sub-images to different depths while forcing their centers to align to form remapped sub-images, and an eye piece. The device and methods allow for a high quality, compact 3D display system that can be wearable and overcomes the vergence-accommodation conflict that leads to visual discomfort and fatigue caused by traditional 3D near eye display devices.

First claim

The invention claimed is:

1. A three dimensional (3D) near eye display device comprising:
a display screen that displays a plurality of two dimensional (2D) images;
a focusing element that collimates the plurality of 2D images;
a spatial multiplexing unit (SMU) that remaps the plurality of 2D images to different depths while forcing centers of the plurality of 2D images to align; and
an eye piece.

2. The 3D near eye display device of claim 1 , wherein the SMU is selected from a liquid-crystal-on-silicon (LCOSD) special light modulator (SLM), a volume holography grating (VHG), and a distorted phase grating.

3. The 3D near eye display device of claim 1 , further comprising a beam splitter positioned between the display screen and the focusing element.

4. The 3D near eye display device of claim 1 , wherein the focusing element is located between the display screen and the SMU.

5. The 3D near eye display device of claim 1 , further comprising a view combiner device that provides augmented reality viewing.

6. The 3D near eye display device of claim 1 , wherein the focusing element comprises a first lens.

7. The 3D near eye display device of claim 6 , further comprising a second lens, wherein the first lens is positioned between the display screen and the SMU, and wherein the second lens is positioned between the SMU and the eye piece.

8. A method comprising:
displaying, by a display screen of a wearable device, a plurality of two dimensional (2D) images;
collimating, by a focusing element of the wearable device, the plurality of 2D images;
modifying, by a spatial multiplexing unit (SMU) of the wearable device, a phase of incident light by adding quadratic and linear phase terms to an incident wave front of the plurality of 2D images resulting in multiplane images; and
reimaging, by an eye piece of the wearable device, the multiplane images onto a viewer's retina.

9. The method of claim 8 , wherein the SMU is selected from a liquid-crystal-on-silicon (LCOSD) special light modulator (SLM), a volume holography grating (VHG), and a distorted phase grating.

10. The method of claim 8 , comprising reflecting, by a beam splitter of the wearable device, light of the plurality of 2D images towards the eye piece.

11. The method of claim 8 , comprising overlaying, by a view combiner device of the wearable device, an image of a real world object with the multiplane images.

12. The method of claim 8 , comprising applying color filtering, by a color filter of the wearable device, to the plurality of 2D images.

13. The method of claim 8 , comprising applying polarization, by a linear polarizer of the wearable device, to the plurality of 2D images.

14. A three dimensional (3D) near eye display device comprising:
a display screen comprising first and second panels that display two dimensional (2D) images;
a beam splitter having first and second surfaces that align with the first and second panels, respectively, wherein the beam splitter combines light emanating from the first and second panels of the display screen;
an actuator that laterally slides the beam splitter in a direction along the first panel of the display screen to adjust a gap between the second panel and the second surface of the beam splitter resulting in an optical path difference;
a focusing element that projects the 2D images to different depth planes; and
an eye piece.

15. The 3D near eye display device of claim 14 , wherein the display screen comprises a single flexible display screen that is foldable into the first and second panels.

16. The 3D near eye display device of claim 14 , wherein the focusing element comprises a lens that is positioned between the beam splitter and the eye piece.

17. The 3D near eye display device of claim 14 , further comprising a view combiner device that provides augmented reality viewing.

18. The 3D near eye display device of claim 17 , wherein the view combiner device is selected from a waveguide and a prism.

19. The 3D near eye display device of claim 14 , wherein the first and second panels of the display screen are orthogonal to each other.

20. The 3D near eye display device of claim 14 , wherein the display screen is a flexible OLED.

Assignees

• Univ Illinois

Inventors

• Gao Liang
• Cui Wei

Classifications

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• G02B27/01 Primary

  Head-up displays · CPC title

• G02B2027/0134

  of stereoscopic type · CPC title

• G02B6/00

  Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings · CPC title

• G02B27/0172

  characterised by optical features · CPC title