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本帖最后由 细胞海洋 于 2013-3-22 14:41 编辑
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Glasses-free three-dimensional (3D) displays could " ?: B9 `6 m) z$ p! o/ `& J
revolutionize areas such as data visualization, medical training and : Q F$ a4 b* m* f- X
entertainment, particularly if adapted to mobile devices. Holography can provide
& d; P4 ?, Y J4 t* mideal 3D viewing but is too slow or expensive for many applications. Multiview
+ c1 H& v, D1 \* r4 kapproaches are the alternative, exploiting various geometric optical tricks to % T s/ w( |- v. a0 j
create 3D images that can be viewed from many directions at the same time. A team working at Hewlett-Packard’s laboratories in Palo Alto
+ c- |( D; x* Y1 A* B+ ?3 xhas developed a new multiview 3D display that is particularly well suited to
; s! U+ ]5 Y U7 J0 r6 K9 V7 N+ q$ pmobile devices, which require thin displays with high spatial resolution and a
! {# N6 X! C& p" X) D; w3 z9 ^( A3 Jwide-angle view zone. Central to the new device is a set of directional grating ; _5 c0 _/ [2 V9 H
pixels, associated with different views and colours, etched on the backlight / l d8 K5 J2 z/ t; U
surface. The display uses an LED-lit backlight very similar to those in use in " C `, I( U" ?% d& f( {+ {* Y
LCD screens today, and is demonstrated in action in transparent hand-held ; ^& e- N$ }: L; v6 l6 ?
prototypes showing animated sequences of up to six different 200-view images at
, h( G1 N) q+ r. E, v9 D6 Ga resolution of 127 pixels per inch. The cover image represents a 3D image from
+ h+ e0 m" k3 N; w" x5 Ua passively modulated backlight. & m6 A1 F2 y) k
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