CRT Display Position Indicator
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
A position of interest on an interactive CRT display screen is indicate by pushing a flexible lightguide film against the screen with a finger or other object and sensing phosphor light coupled into the film at the position of contact between the film and screen. The film is normally spaced slightly away from the screen by an elastic cladding which may be either liquid or solid.