Patent ID: 9696853
Date: 2017-07-04
CPC Classifications: G06F

Claim:
1. An optical touch method for use in an optical touch apparatus which comprises: a first light source for emitting a first light beam; a light guide device disposed in a transmission path of the first light beam, the light guide device comprising a first surface, a second surface opposite to the first surface, and a side surface connecting the first surface and the second surface, the first light beam entering the light guide device through the side surface, wherein the first light beam traveling within the light guide device is reflected by an object close to or in contact with the first surface so as to be converted to a first image light beam emitting out from the second surface; a light reflecting device, which is disposed in a transmission path of the first image light beam to reflect the first image light beam; an image sensing module for receiving the first image light beam, which is disposed in a reflection transmission path of the first image light beam reflected by the light reflecting device; and a second light source for emitting a second light beam, wherein when the optical touch apparatus moves on a working surface, the second light beam is reflected by the working surface to form a second image light beam which is received by the image sensing module, the optical touch method comprising: emitting the second light beam by the second light source and capturing image signals by the image sensing module; and detecting a displacement of the optical touch apparatus on the working surface according to the image signals captured by the image sensing module to determine whether or not to detect a movement of the object on or above the first surface of the light guide device, wherein: condition 1: when a displacement of the optical touch apparatus on the working surface is detected, a detection result of the displacement of the optical touch apparatus is outputted; and condition 2: when no displacement of the optical touch apparatus on the working surface is detected, emitting the first light beam by the first light source and capturing image signals by the image sensing module to detect the movement of the object on or above the first surface of the light guide device, and outputting a detection result of the movement of the object, wherein only one of conditions 1 and 2 exists at a same time.