TOUCH-SENSITIVE DISPLAY DEVICES

摘要

A touch sensitive device, the device comprising: a touch sensor light source to project a plane of light above a surface; a camera directed to capture a touch sense image from a region including at least a portion of said plane of light, said touch sense image comprising light scattered from said plane of light by an object approaching or touching said surface; and a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a lateral location of said object; wherein said signal processor is further configured to: detect when an oscillatory component of ambient light captured by said camera has a frequency different to an integral multiple of a frame rate of said camera; and adjust said frame rate of said camera responsive to said detection to an adjusted frame rate, such that said oscillatory component of said ambient light captured by said camera has a frequency within 10% of an integral multiple of said adjusted frame rate.