It should be possible to embed multitudes of mini LEDs in a flexible transparent surface so that one terminal of the LEDs is fixed to a fine network of conductors to ground and the other termiinals, as fine as hairs, extends backwards from the front surface towards a low voltage charged surface but does not normally touch. The two surfaces are laminated with an edge frame and an air bulb is attached to one edge. Running a finger or a stylus over the outside surface of the transparent surface would cause the extended contacts to latch onto the charged surface and the LEDs would illuminate the path of the finger or stylus thus making an illuminated temporary sign. When the airbulb is squeezed the air pressure between the two surfaces would separate them and the unit would be ready for a new message..
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But for what practical purpose?
What they could do is make an LED array, and affix to that a touch sensor array, and use a computer to link the two, with software to do what you want, thay way the LED/touch sensor could be made into a commercially viable product.
The gadget as I proposed it would be an independent lit sign whose message could be changed in moment with no peripheral electronics necessary. It would be inexpensive, simple to use and easy to change. Attractively low tech.