Touch module and touch detecting method
A touch module including an image sensing unit, a plurality of first reflecting elements, a plurality of second reflecting elements, and a processing unit is provided. The image sensing unit is positioned in correspondence with a first corner of a sensing area and capable of capturing a sensing image to output an image signal. The first reflecting elements and the second reflecting elements respectively have different first angles and different second angles, are disposed along a first and the second edges of the sensing area respectively, and are capable of reflecting a touch object to form a first and a second image in the sensing image. A second corner formed by the first the second edges is diagonal to the first corner. The processing unit is coupled the image sensing unit and receives the image signal to determine the position of the touch object relative to the sensing area.
1. A touch module comprising:
an image sensing unit positioned in correspondence with a first corner of a sensing area and capable of capturing a sensing image to output an image signal;
a plurality of first reflecting elements disposed along a first edge of the sensing area, each of the first reflecting elements having a different first angle, and one of the first reflecting elements capable of reflecting an image of a touch object to the image sensing unit for forming a first image in the sensing image;
a plurality of second reflecting elements disposed along a second edge of the sensing area, each of the second reflecting elements having a different second angle, and one of the second reflecting elements capable of reflecting the image of the touch object to the image sensing unit for forming a second image in the sensing image, a second corner formed by the first edge and the second edge being diagonal to the first corner; and
a processing unit coupled to the image sensing unit and capable of receiving the image signal and determine the position of the touch object relative to the sensing area based on the image signal.
2. The touch module according to claim 1 , further comprising:
a first rotation controller coupled to the first reflecting elements and capable of rotating the first reflecting elements such that the first reflecting elements have the different first angles, the first rotation controller capable of outputting a first rotation position parameter; and
a second rotation controller coupled to the second reflecting elements and capable of rotating the second reflecting elements such that the second reflecting elements have the different second angles, the second rotation controller capable of outputting a second rotation position parameter;
wherein the processing unit calculates a first axial position associated with the touch object according to the first rotation position parameter when the first image appears in the sensing image, and the processing unit calculates a second axial position associated with the touch object according to the second rotation position parameter when the second image appears in the sensing image.
3. The touch module according to claim 2 , wherein the first rotation position parameter is a first axial position of the rotated first reflecting element, and the second rotation position parameter is a second axial position of the rotated second reflecting element.
4. The touch module according to claim 2 , wherein the processing unit comprises:
an image processor coupled to the image sensing unit and capable of detecting whether the first image and the second image appear in the sensing image to output a detecting signal thereby; and
a data processor coupled to the image processor, the first rotation controller, and the second rotation controller, the data processor capable of calculating the first axial position and the second axial position of the touch object according to the detecting signal, the first rotation position parameter, and the second rotation position parameter.
5. The touch module according to claim 1 , wherein the different first angle of each of the first reflecting elements increases gradually in a direction away from the first corner, and the different second angle of each of the second reflecting elements increases gradually in a direction away from the first corner.
6. The touch module according to claim 1 , wherein the angle of each of the first reflecting elements is fixed to the corresponding first angle, and the angle of each of the second reflecting elements is fixed to the corresponding second angle.
7. The touch module according to claim 6 , wherein the processing unit comprises:
an image processor coupled to the image sensing unit, the image processor capable of calculating a first touch angle according to the first image and calculating a second touch angle according to the second image and outputting a detecting signal; and
a data processor coupled to the image processor, the data processor capable of calculating a first axial position of the touch object according to the first touch angle and calculating a second axial position of the touch object according to the second touch angle.
8. The touch module according to claim 1 , wherein each of the first reflecting elements and the second reflecting elements is a reflecting mirror.
9. The touch module according to claim 1 , wherein the image sensing unit comprises a two-dimensional photosensor.
10. The touch module according to claim 1 , wherein the image sensing unit comprises a one-dimensional photosensor.
11. A touch detecting method adapted for a touch module comprising an image sensing unit, a plurality of first reflecting elements, and a plurality of second reflecting elements, the image sensing unit disposed in correspondence with a first corner of a sensing area and capable of capturing a sensing image to output an image signal, the first reflecting elements and the second reflecting elements disposed along a first edge and a second edge of the sensing area respectively, a second corner formed by the first edge and the second edge being diagonal to the first corner, the touch detecting method comprising:
rotating the first reflecting elements such that the first reflecting elements have different first angles, one of the first reflecting elements capable of reflecting an image of a touch object to the image sensing unit for forming a first image in the sensing image;
rotating the second reflecting elements such that the second reflecting elements have different second angles, one of the second reflecting elements capable of reflecting the image of the touch object to the image sensing unit for forming a second image in the sensing image; and
processing the image signal to determine the position of the touch object relative to the sensing area.
12. The touch detecting method according to claim 11 , wherein duration of rotating the first reflecting elements overlaps duration of rotating the second reflecting elements.
13. The touch detecting method according to claim 11 , wherein duration of rotating the first reflecting elements is staggered with a duration of rotating the second reflecting elements.