Coordinate locating method, coordinate locating device, and display apparatus comprising the coordinate locating device
AssigneeHong Kong Applied Science and Technology Research Institute Company Limited
InventorsYaojun Feng, Xiuling Zhu, Shou-Lung Chen, Kwan-Wah Ng
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Abstract
A coordinate locating device for a display apparatus is provided, which can have lower manufacturing costs and can locate the coordinates of a single or multiple objects. The coordinate locating device includes a light source configured to emit light, wherein said light source comprises a light emitting device, at least one reflector configured to reflect the light from the light source, and a detector configured to detect the light reflected by the at least one reflector, wherein the light source and the detector are disposed at different positions on the same edge of the coordinate locating device.
Claims26
A coordinate locating device for locating an object intruding an area monitored by a display apparatus, comprising:
- a light source configured to emit light, wherein the light source comprises a light emitting device;
- at least one reflector configured to reflect the light from the light source, each of the at least one reflector being a diffusive reflector configured to diffusively reflect the light from the light source;
- and a single detector configured to detect the light reflected by the at least one reflector and to detect at least two a shadows appearing on said reflector, a first shadow being caused by an object intruding an area monitored by the display apparatus and blocking the light from the light source and a second shadow being caused by the object intruding an area monitored by the display apparatus and blocking the diffused light from the diffusive reflector, wherein the light source and the single detector are disposed at different positions on the same edge of the coordinate locating device.
A coordinate locating method for a coordinate locating device having a light source, at least one diffusive reflector configured to diffusively reflect the light from the light source, and a single detector adapted to detect a shadow appearing on said reflector, the method comprising:
- obtaining a first line between the light source and a first shadow cast by an object intruding the coordinate locating device and appearing on the at least one reflector;
- obtaining a second line between the single detector and a second shadow cast by the object and appearing on the at least one reflector;
- and locating the coordinates of the object at a cross point of the first and second lines.
A coordinate locating method for a coordinate locating device having a first light source, a second light source, at least one diffusive reflector configured to diffusively reflect the light from the light source, and a single detector adapted to detect a shadow appearing on said reflector, the method comprising:
- simultaneously turning on the first and second light sources to detect shadows cast by an object intruding the coordinate locating device and appearing on the at least one reflector;
- obtaining at least two lines of a plurality of lines, wherein each of the plurality of lines is between one of the first and second light sources and the single detector, and one of the detected shadows;
- and determining the coordinates of the object to be at a cross point of the at least two lines.
A coordinate locating method for a coordinate locating device having a first light source, a second light source, at least one diffusive reflector configured to diffusively reflect the light from the light source, and a single detector adapted to detect a shadow appearing on said reflector, the method comprising:
- simultaneously turning on the first and second light sources to detect a plurality of shadows cast by at least two objects intruding the coordinate locating device and appearing on the at least one reflector;
- obtaining a first group of lines according to a first group of shadows among the plurality of shadows;
- obtaining a second group of lines according to a second group of shadows different from the first group of shadows among the plurality of shadows;
- locating a group of possible coordinates according to the first and second groups of lines;
- obtaining a third group of lines according to the second group of lines and the group of possible coordinates;
- and determining the coordinates of the at least two objects by the third group of lines.
A coordinate locating method for a coordinate locating device having a first light source, a second light source, at least one diffusive reflectors configured to diffusively reflect the light from the light source, and a single detector adapted to detect a shadow appearing on said reflector, the method comprising:
- turning on the first and second light sources by turns to respectively detect a first group of shadows and a second group of shadows cast by one or more objects intruding the coordinate locating device and appearing on the at least one reflector;
- obtaining a first group of lines according to the first group of shadows;
- obtaining a second group of lines according to the second group of shadows;
- determining the one or more coordinates of the one or more objects according to the respective number of shadows in the first and second groups of shadows and the first and second group of lines.
Dependencies are inferred from the claim text.