Three-dimensional display method based on spatial superposition of sub-pixels' emitted beams

Patent metadata

Field	Value
Publication number	US-2021314553-A1
Application number	US-202117226093-A
Country	US
Kind code	A1
Filing date	Apr 9, 2021
Priority date	Apr 3, 2020
Publication date	Oct 7, 2021
Grant date	—

Abstract

The invention discloses a three-dimensional display method based on spatial superposition of sub-pixels' emitted beams. Taking sub-pixels of a display device as the basic display units, sub-pixels that emitting beams of the same color are taken as a sub-pixel group or divided into several sub-pixel groups. Through a beam control device, the sub-pixel groups project more than one image of the target object to a same pupil of the viewer. Passing through a displayed spatial point, more than one beam from sub-pixels of different colors superimpose into a color spatial light spot, where the mosaic of sub-pixels of different colors is employed to present surface-distributed color pixel. The beam control device guides the beam from each sub-pixel to the viewing zone corresponding to a sub-pixel group that contains the sub-pixel, along a special direction and with a constrained divergence angle.

First claim

What is claimed is:

1 . A three-dimensional display method based on spatial superposition of sub-pixels' emitted beams, wherein the method comprises the following steps:
(i) taking sub-pixels of a display device as basic display units, all sub-pixels emitting beams of a same color are taken as a sub-pixel group or divided into several sub-pixel groups; wherein, all sub-pixels of the display device belong to K′ kinds of elementary colors respectively, including sub-pixels of K kinds of primary colors, where K′≥K≥2; wherein, there exist K kinds of filters corresponding to sub-pixels of the K kinds of primary colors by a one-to-one manner, which have characteristics that a ratio between transmittance of the beams emitted by each kind of primary-color sub-pixels with respect to the corresponding filter and that of the beams emitted by each kind of primary-color sub-pixels with respect to any other (K−1) kinds of non-corresponding filters is large than 9; and, the color of the beams emitted by a kind of elementary-color sub-pixels is defined as an elementary color, and a total of K′ kinds of elementary colors exist; the color of the beams emitted by a kind of primary-color sub-pixels is defined as a primary color and a total of K kinds of primary colors exist; (ii) using a beam control device to guide the beam from each sub-pixel to the viewing zone corresponding to the sub-pixel group which contains the sub-pixel respectively, and to constrain the divergence angle of the beam from each sub-pixel; wherein the constrained divergence angle of each beam is designed for a required light distribution on the plane containing the pupil of the viewer, and the required light distribution satisfies that a light distribution area with a light intensity value greater than 50% of a peak light intensity is smaller than a diameter of the pupil along at least one direction; (iii) controlling each sub-pixel group to load and display a corresponding image by a control apparatus which is connected with the display device, wherein the image message loaded on each sub-pixel is a target object's projection message along the sub-pixel's emitted beam; wherein, the image displayed by a sub-pixel group is a perspective view of the target object, and the image displayed by a composite sub-pixel group which is tiled by mutually complementary parts of different sub-pixel groups is a composite perspective view; wherein, a spatial position distribution of the viewing zones corresponding to different sub-pixel groups are arranged to guarantee the same pupil of the viewer perceiving at least two perspective views, or at least two composite perspective views, or at least one perspective view and one composite perspective view.

2 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 1 , wherein the beam control device is an aperture array consisting of at least one aperture group;
wherein, each aperture group contains K apertures, with each aperture attached by one said filter and different apertures attached by different kinds of the filters; wherein, for each aperture, a sub-pixel group consisting of sub-pixels corresponding to the aperture's filter takes the aperture as the viewing zone when the beams from the sub-pixel-group pass through the aperture.

3 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 2 , wherein the aperture array contains M aperture groups, and different aperture groups only allow light with different orthogonal characteristics passing through, respectively, where M≥2.

4 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 3 , wherein the different orthogonal characteristics refer to temporal orthogonal characteristics permitting an incident light passing through at different time-points sequentially, or two polarization states with orthogonal linear polarization directions, or two polarization states of left-handed circular polarization and right-handed circular polarization, or combinations of the temporal orthogonal characteristics and the two polarization states with orthogonal linear polarization directions, or combinations of the temporal orthogonal characteristics and two polarization states of left-handed circular polarization and right-handed circular polarization.

5 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 1 , wherein the beam control device is an aperture array consisting of at least one aperture group,
wherein, each aperture group contains K′ apertures, with the K′ apertures of the aperture group corresponding to K′ kinds of elementary colors in a one-to-one manner; wherein, the aperture corresponding to a primary color is attached by the filter corresponding to the primary color; and for each aperture, a sub-pixel group emitting light with an elementary color corresponding to the aperture takes the aperture as the corresponding viewing zone when the beams from the sub-pixel group passing through the aperture; wherein, the K apertures of an aperture group attached by filters allow beams with an identical orthogonal characteristic passing through, while other (K′−K) apertures of the aperture group respectively allow light of other (K′−K) kinds of corresponding orthogonal characteristics passing through, with all these (K′−K+1) kinds of orthogonal characteristics being mutually different.

6 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 5 , wherein the aperture array contains M aperture groups, and different aperture groups only allow light with mutually different orthogonal characteristics passing through, respectively, where M≥2.

7 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 5 , wherein the different orthogonal characteristics refer to temporal orthogonal characteristics permitting an incident light passing through at different time-points sequentially, or two polarization states with orthogonal linear polarization directions, or two polarization states of left-handed circular polarization and right-handed circular polarization, or combinations of the temporal orthogonal characteristics and the two polarization states with orthogonal linear polarization directions, or combinations of the temporal orthogonal characteristics and the two polarization states of left-handed circular polarization and right-handed circular polarization.

8 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 1 , wherein
the display device is a passive display device equipped with a backlight array consisting of at least one backlight group, and the beam control device is an optical device which projects a real image of the backlight array; wherein, each backlight group consists of K backlights which emit light of K different kinds of primary colors, respectively, and the light distribution area of the real image of the backlight array is taken as the viewing zone of the sub-pixel group which emit light of the color same to the backlight and whose emitted beams pass through the light distribution area.

9 . The three-dimensional display method based on spatial superposition of sub-pixels' emitted beams according to claim 8 , wherein the backlight array contains M backlight groups, and different backlight groups emit light with mutually different orthogonal characteristics, where M≥2.

10 . The three-dimensional display method based on spatial super

Assignees

• Univ Sun Yat Sen

Inventors

• Teng Dongdong
• Liu Lilin

Classifications

• H04N13/307

  using fly-eye lenses, e.g. arrangements of circular lenses · CPC title

• H04N13/383

  for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes · CPC title

• H04N13/324

  Colour aspects · CPC title

• G02B30/25

  using polarisation techniques · CPC title

• G02B30/33 Primary

  involving directional light or back-light sources · CPC title