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Microsoft this week filed a patent application covering ... construct a "tactile" touchscreen – a display that use... to convince users they are actually touching the ridges,... of a displayed image.
Whereas previous screens produced only an illusion

Microsoft develops shape-shifting touchscreen - tech - 26 November 2010 - New Scientist
http://www.newscientist.com/...microsoft-develops-shapeshifting-touchscreen.html

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Microsoft this week filed a patent application covering a novel way to construct a "tactile" touchscreen – a display that uses technical tricks to convince users they are actually touching the ridges, bumps and textures of a displayed image.

Whereas previous screens produced only an illusion of texture, Microsoft proposes producing a real texture, using pixel-sized shape-memory plastic cells that can be ordered to protrude from the surface on command.

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<p class="infuse">Microsoft this week filed a patent application covering a novel way to construct a "tactile" touchscreen &#x2013; a display that uses technical tricks to convince users they are actually touching the ridges, bumps and textures of a displayed image.</p> <p class="infuse">Whereas previous screens produced only an illusion of texture, Microsoft proposes producing a real texture, using pixel-sized shape-memory plastic cells that can be ordered to protrude from the surface on command.</p>