Three-dimentional display system based on division multiplexing of viewer's entrance-pupil and display method thereof

Patent metadata

Field	Value
Publication number	US-10652526-B2
Application number	US-201715481467-A
Country	US
Kind code	B2
Filing date	Apr 7, 2017
Priority date	Apr 25, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The invention features techniques and systems for presenting two or more perspective views to each eye of the viewer, through division multiplexing of the viewer's entrance-pupil. The system is constituted by a selective-aperture array with each aperture being transparent only to light beams with some special characteristics, at least one display screen for optical information presentation, and other optional elements. The optical message on at least one display screen propagates to the selective-aperture array directly, or be directed to the selective-aperture array or the eye of the viewer by other optional elements. Through selective filtering by the apertures with temporal filtering characteristics or exclusive filtering characteristics, multiple perspective views get presented to an eye of the viewer through the selective-aperture array. Light rays different perspective views superimpose into real spatial light spots that the eye can focus on naturally, resulting in overcoming of the accommodation-convergence conflict.

First claim

What is claimed is:

1. A three-dimensional display system based on division multiplexing of a viewer's entrance-pupil comprising:
a selective-aperture array with each aperture being transparent only to light beams with pre-designed specific characteristics, and at least one display screen for optical information presentation;
wherein the selective-aperture array is arranged such that, for each selective aperture of the selective-aperture array, light beams from the at least one display screen that pass through the selective aperture only can reach a pupil of the viewer;
wherein the selective-aperture array guides two or more perspective views from the at least one display screen to the single pupil or each of the pupils of the viewer;
wherein the selective-aperture array is designed based on one of temporal characteristics, exclusive characteristics and a complex of the temporal characteristics and the exclusive characteristics,
wherein the temporal characteristics mean that selective apertures are turned on in a time sequential way and the light beams from the at least one display screen only go through the turned-on aperture at a time-point;
the exclusive characteristics mean a selective aperture is transparent only to the light beams with corresponding characteristics; and
the complex of the temporal characteristics and the exclusive characteristics means that different groups of apertures are turned on sequentially, and when a group of apertures are turned on, an aperture of the group is only transparent to the light beams with the corresponding exclusive characteristic.

2. The three-dimensional display system based on the division multiplexing of the viewer's entrance-pupil of claim 1 , further comprising one or more of following components: a projecting lens to project amplified virtual images of the at least one display screen, a guiding structure to re-direct propagating direction of the light beams from the at least one display screen, a combining structure to group different display screens for the projecting lens, a modulation element to adjust the exclusive characteristics of the light beams from the at least one display screen, and at least one baffle for light beams blocking;
wherein the light beams from the display screen propagate to the selective-aperture array directly, or be directed to the selective-aperture array by the projecting lens, or by the guiding structure, or by both the projecting lens and the guiding structure; when two or more display screens are employed for one projecting lens, light beams from the display screens are directed to the selective-aperture array by the combining structure, or by both the combining structure and the guiding structure, or by both the combining structure and the projecting lens, or by the combining structure, the projecting lens and the guiding structure; and the light passing through the selective-aperture array enters the eye directly, or be re-directed to the eye through the guiding structure.

3. The three-dimensional display system based on the division multiplexing of the viewer's entrance-pupil of claim 2 , wherein the display screen is an emissive display screen, or is a non-emissive display screen, or a reflecting screen which reflects the incident optical image, or a transmitting screen which transmits the incident optical image, or a diffraction screen which diffracts the incident optical image.

4. The three-dimensional display system based on the division multiplexing of the viewer's entrance-pupil of claim 3 , wherein the emissive display screen is an organic light-emitting diode display screen, or a light-emitting diode display screen; and the non-emissive display screen is a liquid crystal display screen, or a digital light processing screen.

5. The three-dimensional display system based on the division multiplexing of the viewer's entrance-pupil of claim 2 , wherein the projecting lens is a lens, or an optical element functioning as a lens, or a group of optical elements functioning as a lens; and the projecting lens is focal length-tunable lens, imaging the at least one display screen to multiple planes in a time-sequential way.

6. The three-dimensional display system based on the division multiplexing of the viewer's entrance-pupil of claim 2 , wherein two or three of the projecting lens, the guiding structure and the combining structure is assembled into one optical structure, comprising a polyhedral optical device which has at least one of a diffracting function, a refracting function and a reflecting function.

7. A three-dimensional display method of presenting two or more perspective views to a single pupil or each pupil of a viewer through a selective-aperture array based on temporal characteristics, comprising:
(i) segmenting at least one display screen into at least one sub-screen; and
(ii) at one time-point, turning on a selective aperture, while other selective apertures get turned off; and
(iii) refreshing pixels on each of the at least one sub-screen by the perspective view converging to a point of the zone enclosed by the lines connecting marginal points of the turned-on selective aperture and marginal points of the sub-screen; and
(iv) at different time-points, turning on different selective apertures sequentially, with the at least one display screen being refreshed by corresponding message synchronously,
wherein the selective-aperture array is arranged such that, for each selective aperture of the selective-aperture array, light beams from the at least one display screen that pass through the selective aperture only can reach a pupil of the viewer;
wherein the selective-aperture array guides two or more perspective views from the at least one display screen to the single pupil or each of the pupils of the viewer.

8. A three-dimensional display method of presenting two or more perspective views to a single pupil or each pupil of a viewer through a selective-aperture array of exclusive characteristics, comprising:
(i) grouping pixels of at least one display screen into different pixel sets, with all pixels of each pixel set emitting light beams with a pre-designed specific characteristic, which makes the light beams being not blocked only by a corresponding selective aperture;
(ii) segmenting at least one display screen into at least one sub-screen; and
(iii) refreshing pixels belonging to each pixel sets on each of the at least one sub-screen by the perspective view converging to a point of the zone enclosed by the lines connecting marginal points of the corresponding selective aperture and marginal points of the sub-screen,
wherein the selective-aperture array is arranged such that, for each selective aperture of the selective-aperture array, light beams from the at least one display screen that pass through the selective aperture only can reach a pupil of the viewer;
wherein the selective-aperture array guides two or more perspective views from the at least one display screen to the single pupil or each of the pupils of the viewer.

9. A three-dimensional display method of presenting two or more perspective views to a single pupil or each pupil of a viewer through a selective-aperture array of complex characteristics, comprising:
(i) dividing the selective apertures into different teams, each of which consists of selective apertures with different exclusive characteristics;
(ii) grouping pixels of at least one display screen into different pixel sets, with all pixels of each pixel set emitting light beams with a pre-designed specific characteristic, which makes the light beams being not blocked only by a corresponding selective aperture of each team;
(iii) segmenting at least one display screen into at least one of sub-screen;
(iv)

Assignees

• Univ Sun Yat Sen

Inventors

• Liu Lilin
• Teng Dongdong

Classifications

• H04N13/341 Primary

  using temporal multiplexing · CPC title

• H04N13/398

  Synchronisation thereof; Control thereof · CPC title

• H04N13/344

  with head-mounted left-right displays · CPC title

• H04N2213/008

  Aspects relating to glasses for viewing stereoscopic images · CPC title

• H04N13/315

  the parallax barriers being time-variant · CPC title