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本帖最后由 细胞海洋 于 2013-3-22 14:41 编辑 ( o `+ \+ {+ V9 m6 m2 i
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Glasses-free three-dimensional (3D) displays could
# O$ [0 O( K0 jrevolutionize areas such as data visualization, medical training and 7 U; D: b) S. c* _! X& u
entertainment, particularly if adapted to mobile devices. Holography can provide
# n! i" o& f, Aideal 3D viewing but is too slow or expensive for many applications. Multiview 4 N0 Z4 E0 f6 I
approaches are the alternative, exploiting various geometric optical tricks to
. b; j% C8 ~. q4 pcreate 3D images that can be viewed from many directions at the same time. A team working at Hewlett-Packard’s laboratories in Palo Alto
) W# H/ y. ^7 v# t" whas developed a new multiview 3D display that is particularly well suited to # x: K$ u8 ~6 _/ {% t6 v0 o% \
mobile devices, which require thin displays with high spatial resolution and a
( V% P& ~: d) b- swide-angle view zone. Central to the new device is a set of directional grating % ?: B% K1 S/ k
pixels, associated with different views and colours, etched on the backlight
5 T. k$ H9 z9 C2 o. gsurface. The display uses an LED-lit backlight very similar to those in use in
6 K! d3 ^; Y7 n3 E# a. t kLCD screens today, and is demonstrated in action in transparent hand-held 9 J/ z2 G `" r4 P0 u
prototypes showing animated sequences of up to six different 200-view images at
" t' D- A4 {/ W) ba resolution of 127 pixels per inch. The cover image represents a 3D image from
- g7 L/ w1 a* `7 ~7 ~a passively modulated backlight. / `" w+ s4 ?$ D* ^' C
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