Patent ID: 8878818
Filing Date: 2014-11-04
Classification: G06F

Abstract:
1. A multi-touch optical touch panel, comprising: a position-detecting surface with a specified length and a specified width; a first set of a plurality of light-emitting element pairs configured for emitting a plurality of light beams, wherein the first set of light-emitting element pairs are arranged at various points along a first side of the position-detecting surface in a lengthwise direction, and wherein a first light-emitting element is arranged at the left side of each light-emitting element pair in the first set of light-emitting element pairs at an angle 180 −θ a second light-emitting element is arranged at the right side of each light-emitting element pair in the first set of light-emitting element pairs at an angle θ a second set of a plurality of light-emitting elements are arranged at said various points along the first side at 90 degrees with reference to the first side; two reflectors arranged along two opposed sides of the position-detecting surface in the widthwise direction, wherein the reflectors are configured for reflecting the plurality of light beams emitted by the first set of light-emitting element pairs; a first set of a plurality of light-receiving element pairs configured for receiving the plurality of light beams emitted by the first set of light-emitting element pairs, wherein the first set of light-receiving element pairs are arranged at various points along a second side of the position-detecting surface opposite to the first side in a lengthwise direction, and wherein a first light-receiving element is arranged at the left side of each light-receiving element pair in the first set of light-receiving element pairs at an angle θ a second light-receiving element is arranged at the right side of each light-receiving element pair in the first set of light-receiving element pairs at an angle −θ a second set of a plurality of light-receiving elements are arranged at said various points along the second side at −90 degrees with reference to the second side for receiving the plurality of light beams emitted by the second set of light-emitting elements; a control circuit is configured for causing the first set of light-emitting element pairs and the second set of light-emitting elements to emit the plurality of light beams in a predetermined order to scan the position-detecting surface, configured for determining coordinates of the objects positioned on the position-detecting surface and further configured for causing the first set of light-receiving element pairs and the second set of light-receiving elements to receive the plurality of light beams, thereby forming optical paths on the position-detecting surface in a grid pattern; a third set of a plurality of light-emitting element pairs configured for emitting a plurality of light beams, wherein the third set of light-emitting element pairs are arranged in pairs at various points along a first side of the position-detecting surface in a lengthwise direction, and wherein a first light-emitting element is arranged at the left side of each light-emitting element pair in the third set of light-emitting element pairs at an angle 180−θ a second light-emitting element is arranged at the right side of each light-emitting element pair in the third set of light-emitting element pairs at an angle θ a third set of a plurality of light-receiving element pairs configured for receiving the plurality of light beams emitted by the third set of light-emitting element pairs, wherein the third set of light-receiving element pairs are arranged in pairs at various points along a second side of the position-detecting surface opposite to the first side in a lengthwise direction, and wherein a first light-receiving element is arranged at the left side of each light-receiving element pair in the third set of light-receiving element pairs at an angle θ a second light-receiving element is arranged at the right side of each light-receiving element pair in the third set of light-receiving element pairs at an angle −θ wherein there does not exist a multiple relationship among the angle θ wherein the multi-touch optical touch panel is adapted for detecting objects positioned on the position-detecting surface, and wherein at least a portion of the plurality of light beams are blocked by the objects when the objects are positioned on the position-detecting surface, thereby hindering the portion of the plurality of light beams from reaching one of the second set of light-receiving elements and at least one of the first or second light-receiving elements of at least one of the first set of light-receiving element pairs.