(2) A clear touch panel that allows the user to command ... The part of the screen that was overlaid is saved and restored when the screen overlay is removed. THIS DEFINITION IS FOR PERSONAL ...
He pondered adding an external connector for the device’s built-in touch screen overlay, but that broke his no modifications rule. Considering how much one of these things cost, we can’t blame ...
Here’s a bulky old CRT monitor used as a touch-screen without any alterations. It doesn’t use an overlay, but instead detects position using phototransistors in the fingertips of a glove.