Light field display system
View Patent ↗The present disclosure relates to a light field display system including: a plurality of light field display modules spliced at an angle, wherein each of the light field display modules includes a display screen and a micro-lens array located on a light-emitting side of the display screen; a lens group, including a plurality of spliced lenses corresponding to the plurality of light field display modules on a one-to-one basis, wherein the lens group is located on a side, away from the display screen, of the micro-lens array and configured to form a plurality of first imaging faces corresponding to the plurality of light field display modules on a one-to-one basis on one side, away from the micro-lens array, of the display screen, and the plurality of first imaging faces are seamlessly spliced to form a plurality of second imaging faces seamlessly spliced on a side, away from the light field display module, of the plurality of first imaging faces, wherein the first imaging face is configured to display an upright virtual image of the corresponding light field display module.
1 . A light field display system comprising:
a plurality of light field display modules spliced at an angle, wherein each of the light field display modules comprises a display screen and a micro-lens array located on a light-emitting side of the display screen; and
a lens group, comprising a plurality of spliced lenses corresponding to the plurality of light field display modules on a one-to-one basis, wherein the lens group is located on a side, away from the display screen, of the micro-lens array, and forms a plurality of first imaging faces, wherein the first imaging faces are on the side, away from the micro-lens array, of the display screen, and correspond to the plurality of light field display modules on one-to-one basis, the plurality of first imaging faces are seamlessly spliced and forms a plurality of second imaging faces, wherein the second imaging faces are on a side, away from the light field display module, of the plurality of first imaging faces and seamlessly spliced, and the first imaging face is configured to display an upright virtual image of the corresponding light field display module;
wherein the spliced lens is a biconvex spherical lens;
wherein each of the first imaging faces comprises a first sub-imaging face and a second sub-imaging face which are not of the same image face, the first sub-imaging face is configured to display an upright virtual image of the display screen, the second sub-imaging face is configured to display an upright virtual image of the corresponding micro-lens array, and the first sub-imaging face is located on a focal plane of the virtual image of the micro-lens array displayed by the second sub-imaging face, so that a light beam emitted from the virtual image of the display screen displayed by the first imaging face forms a collimated light beam incident on a human eye;
the display screen is a part of the second sub-imaging face.
2 . The light field display system of claim 1 , wherein the first imaging face is located at a distance of distinct vision of a human eye.
3 . The light field display system of claim 1 , wherein the plurality of light field display modules are spliced to form a curved surface having an inner concave surface facing a human eye.
4 . The light field display system of claim 1 , wherein a relationship between an actual distance nf 2 ′ between the first sub-imaging face and the second sub-imaging face and a distance t between the display screen and the micro-lens array satisfies the relationship:
nf
2
′
t
=
(
L
1
-
L
3
L
2
)
2
,
(
1
)
where f 2 ′ is the distance between the first sub-imaging face and the second sub-imaging face after an equivalent air layer, L 1 is a distance between the human eye and the second sub-imaging face, L 2 is a distance between the spliced lens and a micro lens in the micro-lens array, L 3 is a distance between the human eye and the spliced lens, n is a refractive index of the micro lens in the micro-lens array, and t is an actual placement height of the micro lens in the micro-lens array relative to the display screen.
5 . The light field display system of claim 4 , wherein
the actual placement height t of the micro lenses with respect to the display screen satisfies the following conditions:
1
-
(
f
1
-
L
2
)
+
1
t
/
n
=
1
f
2
;
1
-
(
L
1
-
L
3
)
+
1
L
2
=
1
f
1
,
(
3
)
where f 1 is a focal length of the spliced lens, f 2 is the focal length of the micro lens, f 2 ′ is the distance from the first sub-imaging face to the second sub-imaging face after the equivalent air layer, L 1 is the distance from the human eye to the second sub-imaging face, L 2 is the distance between the spliced lens and the micro lens, L 3 is the distance from the human eye to the spliced lens, n is the refractive index of the micro lens, and t is the actual placement height of the micro lens relative to the display screen;
and wherein the following geometrical relations are satisfied:
Φ
/
N
p
′
=
L
1
f
2
'
;
(
4
)
p
′
p
=
L
1
-
L
3
+
nf
2
′
t
+
L
2
,
(
5
)
where Φ is a pupil diameter of a human eye, N is the number of viewpoints, p is the pixel spacing on the display screen, and p′ is the pixel spacing in the virtual image of the display screen displayed by the first sub-imaging face;
and wherein the following conditions are satisfied:
f
2
′
=
-
b
+
b
2
-
4
a
c
2
a
;
(
6
)
where,
a
=
Φ
n
L
2
2
(
L
1
-
L
3
)
2
,
b
=
Φ
L
2
-
npNL
1
,
c
=
-
(
L
1
-
L
3
)
pNL
1
;
and the following conditions are satisfied;
f
1
=
L
2
(
L
1
-
L
3
)
L
1
-
L
3
-
L
2
;
(
8
)
f
2
=
t
(
f
1
-
L
2
)
n
(
f
1
-
L
2
)
-
t
.
(
9
)
6 . The light field display system of claim 5 , wherein an aperture D 2 of the micro lenses satisfies the following formula:
D
2
≥
2
L
1
L
2
L
1
-
L
3
tan
(
ε
N
2
)
,
where ε is a limiting angle of resolution of the human eye.
7 . The light field display system of claim 5 , wherein an aperture D 1 of the spliced lens satisfies the following formula:
D
1
=
2
L
3
tan
(
θ
2
)
,
where θ is a field angle corresponding to a single the spliced lens.
8 . The light field display system of claim 5 , wherein a width w of the display screen satisfies the following formula:
w
=
2
(
L
2
+
t
)
(
L
1
+
nf
2
′
)
tan
θ
2
L
1
+
nf
2
′
-
L
3
.
9 . The light field display system of claim 1 , wherein the plurality of light field display modules are spliced to form a first curved surface, an inner concave surface of the first curved surface faces a human eye to enable the plurality of first imaging faces to form a second curved surface and the plurality of second imaging faces to form a third curved surface.