Electronic refreshable tactile display for Braille text and graphics
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United States of America Patent
Stats
-
Dec 3, 1996
Issued Date -
N/A
app pub date -
Aug 1, 1995
filing date -
Jul 21, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
This is a Braille display device which comprises: a plurality of cavities; and circuitry to individually excite the plurality of cavities. The plurality of cavities contain a positive and a negative electrode 18, 22, 26 and are filled with a quantity of polar organic gel 24 sensitive to electric fields. The cavities are sealed by an elastomeric film 14. The elastomeric film is held generally flat, by its own tension, in the absence of any voltage applied to the electrodes 18, 22, 26 in the plurality of cavities. The display device can also include circuitry to determine whether the cavity has been touched by person who is reading the display. The display device can also include circuitry to individually vibrate each cavity. Other devices, systems and methods are also disclosed.
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