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本帖最后由 细胞海洋 于 2013-3-22 14:41 编辑 4 M g) A# J& w; t( K; g1 `
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" ?) `2 s' L+ m& BGlasses-free three-dimensional (3D) displays could
6 J! o) B, I B7 N0 `revolutionize areas such as data visualization, medical training and
! l; S4 D% ^: xentertainment, particularly if adapted to mobile devices. Holography can provide
% P- c5 W8 \: [- R/ Y( kideal 3D viewing but is too slow or expensive for many applications. Multiview
! i4 i* S1 P j7 @5 Fapproaches are the alternative, exploiting various geometric optical tricks to
8 k# X$ n- q% X! Qcreate 3D images that can be viewed from many directions at the same time. A team working at Hewlett-Packard’s laboratories in Palo Alto
K( n. e7 _$ z% p' B5 R# Ohas developed a new multiview 3D display that is particularly well suited to 8 S+ b# k3 }( q; ~
mobile devices, which require thin displays with high spatial resolution and a
; [3 K; o5 L6 ?, y6 a# ?2 Iwide-angle view zone. Central to the new device is a set of directional grating ' h$ Z0 y. _3 H# c6 ?
pixels, associated with different views and colours, etched on the backlight " l) q6 O- g7 d2 L {$ ~
surface. The display uses an LED-lit backlight very similar to those in use in
. _5 u4 V% @7 BLCD screens today, and is demonstrated in action in transparent hand-held
1 C, E' z4 R) z& }prototypes showing animated sequences of up to six different 200-view images at
- g( ~7 t* ^$ S8 L4 O" u% l3 Za resolution of 127 pixels per inch. The cover image represents a 3D image from
h5 m4 Y6 M. I0 Ea passively modulated backlight. ' a C! N1 q7 Q: t' e
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