Optical touch screen

A touch sensitive device comprising: a top plate comprising a plurality of touch detection areas and having one or more light sources associated with the top plate such that light from the one or more light sources is transmitted in total internal reflection within the top plate; a plurality of detectors for detecting light from the one or more light sources, where each detector is associated with a touch detection area; wherein the top plate and the detector are arranged such that if an external object touches a first surface of the top plate in a touch detection area, light is coupled from a second surface of the top plate to an associated detector; the touch-sensitive device further comprises processing means for determining at least whether a touch is present in any of the touch detection areas of the top plate. 一种触敏设备，其包括：顶板，其包括多个触摸检测区域，并且具有与所述顶板相关联的一个或多个光源，使得来自所述一个或多个光源的光在所述顶板内以全内反射透射；多个检测器，其用于检测来自所述一个或多个光源的光，其中每个检测器与触摸检测区域相关联；其中所述顶板和所述检测器布置成使得如果外部物体在触摸检测区域中触摸所述顶板的第一表面，则光从所述顶板的第二表面耦合到相关联的检测器；所述触敏设备还包括处理