Optical touch system and optical touch control method

摘要

An optical touch control method includes steps of: providing a bright background from at least one edge of a touch surface in a first period; providing illumination light to the touch surface in a second period; capturing a first image of an indicator object blocking a portion of the bright background in the first period; and capturing a second image of the indicator object reflecting the illumination light in the second period. An optical touch system is also provided.

主权项

1. An optical touch system, comprising:
a touch surface configured to have a quadrilateral structure defined by a first, second, third and fourth edges connected sequentially; three light emitting elements disposed at the first, second and third edges, respectively, and configured to emit light to the touch surface in a first period; two image sensing devices disposed at an intersecting corner of the fourth and first edges and an intersecting corner of the fourth and third edges, respectively; two illumination devices disposed close to or inside the two image sensing devices, respectively, and configured to emit light to illuminate the touch surface in a second period; and a processing unit electrically connected to the two image sensing devices and configured to control the two image sensing devices to sense the touch surface in the first period and thereby obtaining a first image and a second image, respectively, and control the two image sensing devices to sense the touch surface in the second period and thereby obtaining a third image and a fourth image, respectively.