Interactive input system and method

摘要

An interactive input system comprises a display panel; a first illumination source providing illumination across an outer surface of the display panel such that when a pointer is brought into proximity with the outer surface, the pointer reflects illumination from the first illumination source through the display panel; at least one imaging device having a field of view aimed at an opposite outer surface of the display panel, the at least one imaging device capturing images including illumination reflected by the pointer through the display panel; and processing structure in communication with the at least one imaging device, said processing structure processing the captured images to determine a location of the pointer relative to the outer surface.

主权项

1. An interactive input system comprising:
a liquid crystal display panel; a first illumination source configured to provide a sheet of illumination across and contiguous with an exterior outer surface of the display panel such that when a pointer is brought into proximity with the outer surface and into the sheet of illumination, the pointer reflects illumination of the sheet of illumination through the display panel; a second illumination source configured to provide illumination to an opposite exterior outer surface of the display panel thereby to backlight said display panel; a plurality of imaging devices arranged at spaced locations proximate to but spaced from the opposite exterior outer surface of the display panel, each imaging device having a field of view aimed at an associated sub-region of the opposite exterior outer surface of the display panel with the fields of view of neighboring imaging devices partially overlapping, the imaging devices configured to capture images including the illumination reflected by the pointer through the display panel; processing structure in communication with the imaging devices, said processing structure configured to process the captured images to determine a location of the pointer relative to the exterior outer surface of the display panel, wherein the number of imaging devices and dimensions of the sub regions are selected to reduce dimensions of the interactive input system; and a reflector positioned between the second illumination source and the imaging devices, the reflector having apertures corresponding to locations of the imaging devices and having a reflective surface facing the opposite exterior outer surface of the display panel, the reflective surface configured to reflect illumination impinging thereon to the opposite exterior outer surface of the display panel.