Autostereoscopic display device
The invention provides a autostereoscopic display device with a particular design of lenticular lens array (lens pitch and slant angle) to optimize the quality of the views provided to the user, when a multi-primary pixel layout is used, with at least four sub-pixels of at least three different colors. The slant angle and lens pitch is related to the pixel pitch (in the row and column directions) as well as the number of different color sub-pixels.
1. An autostereoscopic display device comprising:
a display panel having an array of pixels, wherein the pixels are arranged in rows and columns and wherein each of the pixels comprises at least four sub-pixels including sub-pixels of at least three different colors;
a lenticular array arranged over the display panel for projecting a plurality of views in different directions towards a user, and comprising lenticular lenses to project outputs of groups of the sub-pixels into the plurality of views projected towards a user in different directions, thereby enabling autostereoscopic imaging, wherein the lenticular lenses have a long axis which is slanted at an angle θ to the general column pixel direction, and have a pitch P L ,
wherein each pixel has a width in the general row direction of p x and a height in the general column direction of p y ,
and wherein
a
lens
slant
is
=
tan
(
θ
)
=
ap
x
bp
y
,
wherein the rows of pixels are parallel to the display top edge horizontal and the columns of pixels are parallel to the display side edge, and wherein a and b are positive integer numbers,
P
L
=
n
1
n
2
·
p
x
,
with n 1 and n 2 being positive integer numbers, wherein n 1 /n 2 is non integer, and
a
b
=
2
q
·
m
wherein q is the number of different color sub pixels per pixel, and m being a positive integer number.
2. A device as claimed in claim 1 , wherein n 2 =q.
3. A device as claimed in claim 2 , wherein q=4 such that
the
lens
slant
=
tan
(
θ
)
=
1
2
m
p
x
p
y
,
and
P
L
=
n
4
·
p
x
with m and n being positive integer numbers.
4. A device as claimed in claim 3 , wherein n=4k+1 where k is a positive integer.
5. A device as claimed in claim 4 , wherein:
p x /p y =1 and m=1 and n=5.
6. A device as claimed in claim 4 , wherein:
p x /p y =⅔ and m=1 and n=9.
7. A device as claimed in claim 3 , wherein each pixel comprises four columns of sub-pixels and two rows of sub-pixels with different colors in each column, wherein the combined width of two columns is equal to the combined width of the other two columns.
8. A device as claimed in claim 7 , wherein the pixel comprises an RGBW pixel, and the pixel column widths are all the same.
9. A device as claimed in claim 3 , wherein each pixel comprises an RGBY pixel having four columns of sub-pixels, and p x /p y =1 and m=3 and n=4k+2 where k is a positive integer.
10. A device as claimed in claim 9 , wherein k=2.
11. A device as claimed in claim 10 , wherein the red and blue sub-pixels have the same width and the green and yellow sub-pixels have the same width.
12. A device as claimed in claim 11 , wherein the yellow and green sub-pixels are narrower than the red and blue sub-pixels.