Patent ID: 6747636
Filing Date: 2004-06-08
Classification: G03B,G06F,H04L

Abstract:
An interactive display system, comprising:a) a touch-sensitive display screen for detecting pressure applied thereto and in response generating control signals indicating locations of the applied pressure, b) a computer for executing one or more application programs in a multi-tasking environment and in response generating screen video displays, said computer being coupled to said touch-sensitive display screen, c) a driver in said computer, for receiving said control signals from said touch sensitive display screen and in response generating a command to a selected one of said application programs updating said screen video displays in accordance with the pressure applied to said touch-sensitive display screen, d) a projector coupled to said computer for receiving and projecting said screen video displays onto said touch-sensitive display screen, and e) alignment structure, in said computer, to adjust location data in said command, wherein the command includes data for identifying coordinates of the location of the pressure applied to said touch-sensitive display screen, and wherein said alignment structure includes a software routine for (i) projecting via said projector a plurality of predetermined images within the borders of said screen video display onto said touch-sensitive display screen, (ii) detecting user applied pressure at the respective locations indicated by said predetermined images, (iii) in response calibrating said coordinates to compensate for keystoning caused by non-orthogonal misalignment between said projector and said touch-sensitive display screen, and (iv) causing the computer to thereby align said screen video displays with the location of said pressure applied to said touch-sensitive display screen.