File this idea away for future reference.
Use of a multi-LED display as a touch sensor simultaneously with its 
use as a display.
Off LEDs are used as sensors of adjacent on LEDs with light paths 
being interrupted by fingers interrupting the light paths.

Interestingly, cites a 1977 Forrest Mims comment.

        http://mrl.nyu.edu/~jhan/ledtouch/index.html

Presumably this could be done as part of multiplexing a display with 
no visual effect on displayed information.
Cries out for interactive display.
Analog sensing possible.
Use of IR LEDS (perhaps mixed with visible ones) could allow visually 
dark sensor.

____________


Upper level is a personal research page from Jeff Han at NYU.
Some interesting material.

        http://mrl.nyu.edu/~jhan/





Ref: Matthew McMahon


 

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