Autostereoscopic display device
An autostereoscopic display comprises a pixelated display panel comprising an array of single color pixels or an array of sub-pixels of different colors and a view forming arrangement comprising an array of lens elements. The pixels form a hexagonal grid, and the lenses also repeat in a hexagonal grid. A vector p is defined which relates to a mapping between the pixel grid and the lens grid. Regions in the two dimensional space for this vector p are identified which give good or poor banding performance, and the better banding performance regions are selected.
1. An autostereoscopic display, comprising:
a pixelated display panel, pixelated display panel comprising an array of single color pixels or an array of sub-pixels of different colors, wherein each group sub-pixels define full color pixels; and
a view forming arrangement, wherein the view forming arrangement is positioned over the display panel,
wherein the view forming arrangement is arranged to direct light the light from different pixels or sub-pixels to different spatial locations, thereby enabling different views of a three dimensional scene to be displayed in different spatial locations,
wherein the pixels of the display panel form a hexagonal grid, with a maximum internal angle deviation from 120 degrees of 20 degrees or less,
wherein the hexagonal grid repeats with translation vectors a and b, and the lengths of the translation vectors a and b have an aspect ratio of the shorter to the longer between 0.66 and 1;
wherein the view forming arrangement comprises a two dimensional array of lenses which repeat in a hexagonal grid with translation vectors p′ and q′;
wherein defining a dimensionless vector p as (p a ,p b ), which satisfies:
p′=p a a+p b b,
and defining circular regions in the space of components p b and p a for integer n as:
E
n
=
{
p
❘
N
(
p
-
v
)
<
r
n
2
∀
v
∈
Γ
n
}
where
Γ
n
=
{
i
+
j
n
❘
i
,
j
∈
2
⩓
N
(
j
)
=
n
}
where n is an integer number,
with r n =r 0 n −γ defining the radius of each circle, Γ n defining the circle centers, and with N comprising a vector function for two coordinate vectors defined as:
N
(
[
a
b
]
)
=
a
2
-
ab
+
b
2
,
the translation vectors a, b, p′ and q′ are selected with values such that p falls in a vector space, wherein the vector space excludes the sets E 1 , E 3 or E 4 with r 0 =0.1 and γ=0.75.
2. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p falls in the vector space which excludes the set E 1 with r 0 =0.25 and γ=0.75.
3. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p falls in the vector space which excludes the set E 3 with r 0 =0.25 and γ=0.75.
4. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p falls in the vector space which excludes the set E 4 with r 0 =0.25 and γ=0.75.
5. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p is not in the defined set or sets with r 0 =0.35.
6. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p is in the set E 7 with r 0 =0.35 and γ=0.75.
7. The display as claimed in claim 1 , wherein the translation vectors a, b, p′ and q′ have values such that p is in the set E 9 with r 0 =0.35 and γ=0.75.
8. The display as claimed claim 1 , wherein the pixel hexagonal grid translation vectors a and b have an aspect ratio of the lengths of the shorter to the longer vector between 0.83 and 1.
9. The display as claimed in claim 1 , wherein the pixel hexagonal grid has a maximum internal angle deviation from 120 degrees of 5 degrees or less.
10. The portable device comprising a display as claimed in claim 1 , wherein the portable device is configurable to operate in a portrait display mode and a landscape display mode.
11. A portable device as claimed in claim 10 , comprising a mobile telephone.
12. A portable device as claimed in claim 10 , comprising a tablet.