Patent ID: 8400429
Filing Date: 2013-03-19
Classification: G06F

Abstract:
1. A touch device for sensing and computing a coordinate of a touch object, wherein the touch device comprises: a panel having a sensing area surrounded by a first boundary, a second boundary, a third boundary and a fourth boundary, wherein a coordinate system is defined by an extension direction of the first boundary and the third boundary define as x-direction and an extension direction of the second boundary and the fourth boundary as y-direction; a light-emitting element located on the first boundary and emit a first light and a second light; an image sensor located on the first boundary with a specific distance relative to the light-emitting element for sensing an image of the sensing area; a reflective strip located on the second, the third and the fourth boundaries; and a processing unit electrically connected to the image sensor; wherein when the touch object touches the sensing area, a real dark point and a virtual dark point are generated in the image; wherein the real dark point is formed by blocking a first light path formed by reflecting the first light on a first reflection point of the reflective strip, the virtual dark point is formed by blocking a second light path formed by reflecting the second light on a second reflection point of the reflective strip, and the second light is blocked directly by the touch object before being reflected; and wherein the processing unit computes the coordinate of the touch object on the coordinate system according to positions of the real dark point and the virtual dark point in the image.