LOCATION DETECTING METHOD, INTERACTIVE DISPLAY SYSTEM, AND LOCATION DETECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an interactive display system including a pixel-based display surface and a light pen.SOLUTION: A sequence of patterns is projected onto the display surface. The sequence of patterns has a unique sequence of light intensities for each location of the display surface. Intensities of light at an optional location are sensed by the light pen while projecting the sequence of patterns. The intensities of light are decoded to determine coordinates of the optional location.