Autostereoscopic display device
View Patent ↗An autostereoscopic display device comprises a display ( 103 ) having an array of display pixels ( 105 ) and a view forming arrangement ( 109 ) of elongate elements which have a long axis which is slanted at an angle α to the column pixel direction, and the elements have a pitch of P times the width between pixels of the same color in different columns. The pitch P is selected to be: P=0.5·k·(1+S 2 ) in which S=tan α, and k is a positive integer. This arrangement enables the resulting image projected in respect of each view to have a uniform and regular distribution of pixels across the image. This improves the visual appearance of the views.
1. An autostereoscopic display device comprising:
a display ( 103 ) having an array of display pixels ( 105 ) for producing a display, wherein the display pixels are arranged in rows and columns;
a view forming arrangement for projecting a plurality of views each of which in a different direction, the view forming arrangement comprising elongate elements which have a long axis which is slanted at an angle α to the column pixel direction, and the elongate elements have a pitch of P times the width between pixels of the same colour in different columns,
and wherein the pitch P is selected to be:
P= 0.5· k ·(1+ S 2 )
in which S=tan α, and k is a positive integer.
2. The autostereoscopic display device as claimed in claim 1 , wherein the display pixels are arranged in columns of red, green and blue sub-pixels, wherein the column width comprises the distance between adjacent same-colour sub-pixel columns, and wherein:
k= 3(2 N+ 1)
where n is 0 or a positive integer.
3. The autostereoscopic display device as claimed in claim 2 , wherein:
S= 1 /v· 2· N+ 1
wherein v is equal to the width to height ratio of the pixel grid for the individual views projected towards the user.
4. The autostereoscopic display device as claimed in claim 2 , wherein:
S=V/N
wherein V is equal to the width to height ratio of the pixel grid for the individual views projected towards the user.
5. The autostereoscopic display device as claimed in claim 1 , wherein the display pixels are arranged in columns of single colour pixels, and wherein
k= 2 N+ 1
where n is 0 or positive integer.
6. The autostereoscopic display device as claimed in claim 5 , wherein:
S= 1/( V· 2· N+ 1), or
S=v/N
wherein V is equal to the width to height ratio of the pixel grid for the individual views projected towards the user.
7. The autostereoscopic display device as claimed in claim 3 , wherein V=1.
8. The autostereoscopic display device as claimed in claim 3 , wherein V=√3 or 1/√3.
9. The autostereoscopic display device as claimed in claim 1 , wherein the pixel rows are offset from being orthogonal to the pixel columns.
10. The autostereoscopic display device as claimed in claim 9 , wherein the vertical displacement between one pixel and the next pixel along the row is given by:
y =( P/m− 1)/ S
where m is a positive integer.
11. The autostereoscopic display device as claimed in claim 10 , wherein the width to height ratio of the pixels is given by:
w/h=S−y , or
w/h= 2 S−y.
12. The autostereoscopic display device as claimed in claim 10 wherein P is a non-integer.
13. The autostereoscopic display device as claimed in claim 9 , wherein the rows of pixels are parallel to a top edge of the display.
14. The autostereoscopic display device as claimed in claim 9 , wherein the columns of pixels are parallel to a side edge of the display.
15. The autostereoscopic display device as claimed in claim 1 , wherein the view forming arrangement comprises a lenticular array ( 109 ) arranged in registration with the display ( 103 ), and wherein the elongate elements comprise lenticular lenses ( 111 ) configurable to focus outputs of groups of the display pixels ( 105 ) into the plurality of views projected towards a user in different directions, thereby enabling autostereoscopic imaging.