Patent Document ID: 9645681
Application ID: 13288035
Patent Status: 1

Claim One:
1. An optical touch display system, comprising: a touch region; a light source, on a periphery of the touch region, the light source positioned at least partially above the touch region, such that light rays emitted from the light source may traverse the touch region; an image sensor, disposed above the light source, for receiving light rays of the light source, reflected from a touch point on the touch region, and generating a two-dimensional image accordingly, wherein the image sensor is a light sensing array containing M columns and N rows of sensing units for generating the two-dimensional image having a resolution of M×N, where M and N are both integers greater than or equal to two; a first lens, the first lens for converging a background light or light rays reflected from the first touch point, wherein the image sensor senses an energy of the light converged by the first lens to generate M light sensing signals; wherein the two-dimensional image comprises a set of optical images corresponding to the touch point, a first optical image of the set of optical images corresponds to a first touch point of the touch point, and a first image distance of the set of image distances and a first image angle of the set of image angles correspond to the first optical image; a distance measurement device, connected to the light source and the image sensor, for controlling the light source and the image sensor, and generating a set of image distances corresponding to the set of optical images according to coordinates of the set of optical images in the two-dimensional image along a first direction along a Y-axis of the set of optical images in the two-dimensional image, the distance measurement device comprising: a lighting/sensing control circuit, connected to the light source, for controlling the light source to emit light during a distance sensing stage, while controlling the image sensor to sense the energy of the light converged by the first lens to generate M first light sensing signals, and controlling the light source to not emit light during a noise sensing stage, while controlling the image sensor to sense the energy of the light converged by the first lens to generate M second light sensing signals; and a distance calculation circuit, connected to the image sensor, for determining an image position of the light rays reflected from the first touch point along the first direction of the image sensor according to the M first light sensing signals and the M second light sensing signals, and calculating the first image distance according to the image position, a focal distance of the first lens, a predefined distance between the light source and the image sensor; an angle measurement device, connected to the image sensor, for generating a set of image angles corresponding to the set of optical images according to coordinates of the set of optical images in the two-dimensional image along a second direction; and a processor, for generating a set of output coordinates according to the set of image distances and the set of image angles.