Patent ID: 8890845

Claim:
An optical touch structure, comprising: a light guide element having a light-emitting surface; a light source adjacent to the light guide element, wherein the light guide element guides the light provided by the light source to the light-emitting surface; a reflecting mirror disposed at one side of the light guide element, wherein the extending direction of the reflecting mirror is substantially perpendicular to the light-emitting surface, the intersection of the light guide element and the reflecting mirror defines a first position, and the light guide element and the reflecting mirror define a touch range; and an image sensor disposed on a second position opposite to the first position, having a sensing area that at least covers the touch range; wherein, a light-emitting point on the light-emitting surface of the light guide element emits a first direction light transmitted towards the image sensor directly and a second direction light transmitted towards the image sensor through the reflecting mirror, and when the proceeding path of the first direction light is shorter than that of the second direction light, the strength of the second direction light is larger than that of the first direction light; wherein the light source is disposed adjacent to a corner of the touch range, and the light emitting element is continuously extended to the first position from the corner of the touch range; wherein the light guide element comprises a guide layer and a light splitting layer, the guide layer guides the light provided by the light source, and the light splitting layer enables the light guided by the guide layer to be emitted substantially in two different directions; and wherein the light guide element further comprises an alignment layer disposed between the guide layer and the light splitting layer for guiding the light guided by the guide layer to the light splitting layer in a direction substantially perpendicular to the guide layer, and the guide layer, the alignment layer and the light splitting layer are disposed along the direction; wherein the first direction light and the second direction light are refracted light.