Multi-frame decomposition method for image rendering on multilayer displays

Patent metadata

Field	Value
Publication number	US-12401778-B2
Application number	US-202017426311-A
Country	US
Kind code	B2
Filing date	Jan 28, 2020
Priority date	Jan 31, 2019
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

Systems and methods are described for displaying a light field using a display device in which a plurality of internal light paths contribute to each respective output beam and in which each light path traverses at least one controllable-transparency pixel of the display. In example methods, a target light field is partitioned into a plurality of light field partitions that sum to the target light field. Each light field partition is associated with a subset of the internal light paths. Pixel values of the display device are selected to minimize a total error in each path's contribution to its corresponding light field partition. Methods described herein may be used to select pixel values in display devices that include a diffractive element, such as a diffraction grating.

First claim

What is claimed:

1. A method, for image rendering on a display device comprising one or more spatial light modulators including controllable-transparency pixels, comprising:
determining target beam values for exit light beams emitted from respective locations on the front surface of the display device, each of the exit light beams is formed by contributions from lights propagating along corresponding internal optical paths, each of the internal optical paths passes through at least one of the controllable-transparency pixels;
for each of the exit light beams, partitioning the respective target beam value into beam value partitions, wherein each of the beam value partitions being associated with a corresponding one of the internal optical paths; and
selecting transmittance values for the controllable-transparency pixels so that a sum of error terms is minimized, wherein an error term represents a difference between (i) a contribution from light propagating along an internal optical path to one of the exit light beam and (ii) a beam value partition associated with that internal optical path, and wherein the error term is represented as:

(

L

i
,
p

-

d

i
,
p

⁢

L
i
target

)

2

,

wherein L i,p is a contribution to an exit light beam i by an internal optical path p,
wherein L i target is a target beam value for an exit light beam i, and target is a beam value partition associated with an internal optical path p wherein d i,p L i target is a beam value partition associated with an internal optical path p that contributes to an exit light beam i.

2. The method of claim 1 , wherein the selecting of the transmittance values comprises iteratively adjusting the transmittance values to reduce the sum of the error terms.

3. The method of claim 1 , wherein L i,p is a product of factors comprising a contribution strength constant c i,p and at least one transmittance value of at least one controllable-transparency pixel located along the optical path p.

4. The method of claim 3 , wherein a value of each partitioning constant d i,p is selected based on a corresponding contribution strength constant c i,p .

5. The method of claim 4 , wherein a value of each partitioning constant d i,p is selected to be proportional to a corresponding contribution strength constant c i,p .

6. The method of claim 1 , wherein the selecting of the transmittance values comprises selecting transmittance values that substantially minimize the value of the following expression

∑

i
=
1

I

⁢

∑

p
=
1

P

⁢

W
i

⁢

c

i
,
p

2

⁡

(

1
M

⁢

∑

m
=
1

M

⁢

∏

n
=
1

N

⁢

T

n
,
m
,

f
⁡

(

n
,
p
,
i

)

-

d

i
,
p

c

i
,
p

⁢

L
i
target

)

2

wherein:
i is an index over exit light beams;
p is an index over internal optical paths;
W i is a weighting associated with respective light beam i;
c i,p is a contribution strength constant proportional to a contribution of internal optical path p to exit light beam i;

Assignees

• Interdigital Madison Patent Holdings Sas

Inventors

• Makinen Jukka-Tapani
• Alamaki Markku

Classifications

• G02B30/32 Primary

  characterised by the geometry of the parallax barriers, e.g. staggered barriers, slanted parallax arrays or parallax arrays of varying shape or size · CPC title

• G02B30/31

  involving active parallax barriers (involving directional light or back-light sources G02B30/33) · CPC title

• H04N13/307

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

• H04N13/312 Primary

  the parallax barriers being placed behind the display panel, e.g. between backlight and spatial light modulator [SLM] · CPC title

• H04N13/31 Primary

  using parallax barriers · CPC title