Grating based three-dimentional display method for presenting more than one views to each pupil

Patent metadata

Field	Value
Publication number	US-11012673-B2
Application number	US-201916479926-A
Country	US
Kind code	B2
Filing date	Jan 2, 2019
Priority date	Jan 12, 2018
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

The invention features techniques for presenting more than one perspective views to each eye of the viewer, through generating viewing zones with an interval smaller than the diameter of the viewer's pupil by display panel/grating pair/pairs. In the first method, the arraying direction of the small-interval viewing zones is designed having an appropriate small inclination angle to the line connecting the viewer's two pupils, so as to cover each eye with more than one viewing zones which are different with each other. In the extreme case, 4 small-interval viewing zones can implement 3D display with two views for each eye. This is absolutely different with existing grating-based 3D display, which aligns viewing zones along the direction with a small angle (<π/4) to the line connecting the viewer's two pupils and thus a rather large number of small-interval viewing zone is needed for covering the viewer's two eyes.

First claim

What is claimed is:

1. A three-dimensional display method of presenting more than one perspective views to each eye of a real viewer by means of grating light-splitting, comprising:
(S1) according to application scenarios, place two pupils of a virtual viewer at positions where two pupils of the real viewer most frequently appear when the real viewer watches a flat display panel for 3D effect, with a reference direction being set along a line connecting central points of two virtual pupils and a reference vertical direction being perpendicular to the reference direction;
(S2) adhere an one-dimensional grating to the flat display panel for directing light beams from M≥4 groups of pixels on the flat display panel to corresponding M I-type viewing zones on a viewing-zone plane, respectively, with an arraying direction of periodic units of the one-dimensional grating being defined as a grating direction;
wherein the I-type viewing zones have characteristics: an interval Δd between adjacent viewing zones along the grating direction is smaller than a diameter of the pupil D pupil , and an inclination angle Δθ of the arraying direction of the viewing zones to the reference vertical direction satisfies
arcsin( D pupil /D eye-eye )≤abs(Δθ)≤min(arcsin(( D pupil +( M− 2)/Δ d )/ D eye-eye ),π/4),

is an eye distance of the real viewer;
(S3) at a time-point t, detect a concrete posture and a position of the pupils of the real viewer, draw an actual reference direction and an actual reference vertical direction correspondently, and determine projection pupils of the pupils of the real viewer;
wherein the projection pupil of the pupil of the real viewer is determined as following: a field angle of each pixel to the pupil of the real viewer intercepts an area on the viewing-zone plane, and all such intercepted areas together construct the projection pupil of the pupil of the real viewer;
(S4) check a spatial relationship between the I-type viewing zones for the pupils of the virtual viewer or determined at a last time-point and the projection pupils of the real viewer, making sure its satisfaction of a criteria that each projection pupil of the real viewer intersects with more than one viewing zones and the viewing zones intersected by different projection pupils of the real viewer are absolutely different;
(S5) for a denial result, adjust the posture and the position of the flat display panel/grating pair to meet the criteria of step (S4), or/and adjust parameters of the flat display panel/grating pair to re-generate new I-type viewing zones for the pupils of the real viewer;
(S6) refresh each group of pixels on the flat display panel by a perspective view of a target three-dimensional scene for the correspondent I-type viewing zone;
wherein a minimum M=4 represents the situation that two of four different perspective views are presented to each eye of the real viewer when the projection pupils of the viewer just intersect with two groups of four I-type viewing zones respectively on the viewing-zone plane;
(S7) at different time-points, implement steps (S3) to (S6) repeatedly.

2. A three-dimensional display method of presenting more than one perspective views to each eye of a real viewer by means of grating light-splitting, comprising:
(SS1) according to application scenarios, place two pupils of a virtual viewer at positions where two pupils of the real viewer most frequently appear when the real viewer watches a curved display panel for 3D effect, with a reference direction being set along a line connecting central points of two virtual pupils and a reference vertical direction being perpendicular to the reference direction;
(SS2) adhere an one-dimensional grating to the curved display panel for directing light beams from M′≥4 groups of pixels on the curved display panel to corresponding M′ II-type viewing zones on a viewing-zone plane, respectively, with an arraying direction of periodic units of the one-dimensional grating being defined as a grating direction;
wherein the II-type viewing zones have characteristics: an interval Δd between adjacent viewing zones along the grating direction is smaller than a maximum size P pupil of the projection pupils of the real viewer along the grating direction, and an inclination angle abs(Δθ) of an arraying direction of the viewing zones to the reference vertical direction is designed appropriately for guaranteeing that each projection pupil of the virtual viewer intersects with more than one viewing zones and the viewing zones intersected by different projection pupils of the virtual viewer are absolutely different;
wherein the maximum value of abs(Δθ) is not larger than π/4, abs( ) means the absolute function and the projection pupil of the pupil of the real viewer is determined as following: a field angle of each pixel to the pupil intercepts an area on the viewing-zone plane, and all such intercepted areas together construct the projection pupil of this pupil;
(SS3) at a time-point t, detect a concrete posture and a position of the pupils of the real viewer, draw an actual reference direction and an actual reference vertical direction correspondently, and determine the projection pupils of the pupils of the real viewer;
(SS4) check a spatial relationship between the II-type viewing zones for the pupils of the virtual viewer or determined at a last time-point and the projection pupils of the real viewer, making sure its satisfaction of a criteria that each projection pupil of the real viewer intersects with more than one viewing zones and the viewing zones intersected by different projection pupils of the real viewer are absolutely different;
(SS5) for a denial result, adjust the posture and the position of the curved display panel/grating pair to meet the criteria of step (SS4), or/and adjust parameters of the curved display panel/grating pair for re-generating new II-type viewing zones for the pupils of the real viewer;
(SS6) refresh each group of pixels on the curved display panel by a perspective view of a target three-dimensional scene for the correspondent II-type viewing zone;
wherein a minimum M′=4 represents the situation that two of four different perspective views are presented to each eye of the real viewer when the projection pupils of the viewer just intersect with two groups of four II-type viewing zones respectively on the viewing-zone plane;
(SS7) at different time-points, implement steps (SS3) to (SS6) repeatedly.

3. A three-dimensional display method of presenting more than one perspective views to each eye of a real viewer by means of grating light-splitting, comprising:
(SSS1) according to application scenarios, place two pupils of a virtual viewer at positions where two pupils of the real viewer most frequently appear when the real viewer watches a multi-view display panel for 3D effect, with a reference direction being set along a line connecting central points of the two virtual pupils and a reference vertical direction being perpendicular to the reference direction;
wherein the multi-view display panel which is composed of a flat display panel and affiliated self-carried optical component/components can present multiple self-carried viewing zones;
wherein the self-carried viewing zones aligned along a direction with an inclination angle smaller than π/4 to the reference direction have characteristics: light rays passing through one self-carried viewing zone must not reach both pupils of the real viewer simultaneously;
(SSS2) adhere an one-dimensional grating to the flat display panel of the multi-view display panel for directing light beams from N≥2 groups of pixels on the flat display panel to corresponding N III-type viewing zones on a viewing-zone plane respectively, with an arraying direction of periodic units of the one-dimensional grating named as a grating direc

Assignees

• Univ Sun Yat Sen

Inventors

• Liu Lilin
• Teng Dongdong

Classifications

• H04N13/10 Primary

  Processing, recording or transmission of stereoscopic or multi-view image signals · CPC title

• H04N13/305 Primary

  using lenticular lenses, e.g. arrangements of cylindrical lenses · CPC title

• H04N13/354

  for displaying sequentially · CPC title

• H04N2013/405

  the images being stereoscopic or three dimensional · CPC title

• H04N13/31

  using parallax barriers · CPC title