Touch control apparatus and associated selection method
View Patent ↗A touch control apparatus includes a first light source, a first sensor, a second light source, a second sensor and a controller. An associated selection method includes following steps. The first and the second light sources are driven to respectively generate a first and a second plane lights. Both the first and the second plane light are reflected by at least two touch points. A left reflected light distribution is sensed and transformed into multiple left depth parameters by the first sensor, and a right reflected light distribution is sensed and transformed into multiple right depth parameters by the second sensor. Correspondingly, positions of the at least two touch points are selected from the candidate touch points according to the left and right depth parameters.
1. A touch control apparatus, for determining touch points corresponding to at least two objects from a plurality of candidate touch positions, the apparatus comprising:
a display panel;
a first light source, located at a left side of the display panel, for generating a first plane light, which is reflected by the at least two objects to form a left reflected light distribution;
a first sensor, disposed at the display panel, for sensing and transforming the left reflected light distribution into a plurality of left depth parameters, wherein the plurality of left depth parameters are respectively corresponding to relative position between the at least two objects and the first sensor;
a second light source, located at a right side of the display panel, for generating a second plane light, which is reflected by the at least two objects to form a right reflected light distribution;
a second sensor, disposed at the display panel, for sensing and transforming the right reflected light distribution into a plurality of right depth parameters, wherein the plurality of right depth parameters are respectively corresponding to relative position between the at least two objects and the second sensor; and
a controller, electrically coupled to the first sensor and the second sensor, for selecting touch points corresponding to the at least two objects from the plurality of candidate touch positions according to the plurality of left depth parameters and the plurality of right depth parameters.
2. The touch control apparatus according to claim 1 , wherein a sensing range of the first sensor is represented by a plurality of left position indices corresponding to the plurality of left depth parameters, respectively; and a sensing range of the second sensor is represented by a plurality of right position indices corresponding to the plurality of right depth parameters, respectively.
3. The touch control apparatus according to claim 2 , wherein the touch points of the at least two objects comprise a first touch point and a second touch point; the first touch point corresponds to a first left position index and a first right position index; and the second touch point corresponds to a second left position index and a second right position index.
4. The touch control apparatus according to claim 3 , wherein the left depth parameter corresponding to the first left position index and the left depth parameter corresponding to the second left position index are relative extremum values among the left depth parameters; and the right depth parameter corresponding to the first right position index and the right depth parameter corresponding to the second right position index are relative extremum values among the right depth parameters.
5. The touch control apparatus according to claim 3 , wherein when a relative distance between the first touch point and the first sensor is greater than a relative distance between the second touch point and the first sensor, the left depth parameter corresponding to the first left position index is smaller than the left depth parameter corresponding to the second left position index; and, when the relative distance between the first touch point and the first sensor is smaller than the relative distance between the second touch point and the first sensor, the left depth parameter corresponding to the first left position index is greater than the left depth parameter corresponding to the second left position index.
6. The touch control apparatus according to claim 3 , wherein when a relative distance between the first touch point and the second sensor is greater than a relative distance between the second touch point and the second sensor, the right depth parameter corresponding to the first right position index is smaller than the right depth parameter corresponding to the second right position index; and, when the relative distance between the first touch point and the second sensor is smaller than the relative distance between the second touch point and the second sensor, the right depth parameter corresponding to the first right position index is greater than the right depth parameter corresponding to the second right position index.
7. The touch control apparatus according to claim 1 , wherein a number of the candidate touch points is equal to a square of a number of the at least two objects.
8. The touch control apparatus according to claim 1 , wherein the first sensor and the second sensor are depth lenses.
9. The touch control apparatus according to claim 1 , wherein the first light source and the second light source are laser light sources or light-emitting diode light sources.
10. The touch control apparatus according to claim 1 , wherein the first light source emits a first emitted light, and the second light source emits a second emitted light, the touch control apparatus further comprising:
a first collimation lens, disposed in front of the first light source, for condensing the first emitted light to form a first dot light source;
a first filter, disposed in front of the first collimation lens, for forming the first plane light from the first dot light source;
a second collimation lens, disposed in front of the second light source, for condensing the second emitted light to form a second dot light source; and
a second filter, disposed in front of the second collimation lens, for forming the second plane light from the second dot light source.
11. The touch control apparatus according to claim 1 , wherein the display panel is a rectangle having a first side, a second side, a third side and a fourth side; wherein the first side and the third side are parallel, and the second side and the fourth side are parallel.
12. The touch control apparatus according to claim 11 , wherein the first light source is disposed at an included angle formed by the first side and the four side, and the second light source is disposed at an included angle formed by the third side and the fourth side.
13. The touch control apparatus according to claim 11 , wherein the first side, the second side and the third side are disposed with a light absorbent edge or a retroreflective edge, respectively.
14. A selection method, for selecting touch points corresponding to at least two objects from a plurality of candidate touch positions of a touch control apparatus, the selection method comprising steps of:
driving a first light source to generate a first plane light, and the at least two objects reflecting the first plane light to form a left reflected light distribution;
sensing the left reflected light distribution by a first sensor, and representing the left reflected light distribution by a plurality of left depth parameters, wherein the plurality of left depth parameters are respectively corresponding to relative position between the at least two objects and the first sensor;
driving a second light source to generate a second plane light, and the at least two objects reflecting the second plane light to form a right reflected light distribution;
sensing the right reflected light distribution by a second sensor, and representing the right reflected light distribution by a plurality of right depth parameters, wherein the plurality of right depth parameters are respectively corresponding to relative position between the at least two objects and the second sensor; and
selecting touch points corresponding to the at least two objects from the plurality of candidate touch positions according to the plurality of left depth parameters and the plurality of right depth parameters.
15. The method according to claim 14 , wherein sensing range of the first sensor is represented by a plurality of left position indices corresponding to the left depth parameters, respectively; and a sensing range of the second sensor is represented by a plurality of right position indices corresponding to the right depth parameters, respectively.
16. The method according to claim 15 , wherein touch points of the at least two objects comprise a first touch point and a second touch point; the first touch point corresponds to a first left position index and a first right position index; and the second touch point corresponds to a second left position index and a second right position index.
17. The method according to claim 16 , wherein the left depth parameter corresponding to the first left position index and the left depth parameter corresponding to the second left position index are relative extremum values among the left depth parameters; and the right depth parameter corresponding to the first right position index and the right depth parameter corresponding to the second right position index are relative extremum values among the right depth parameters.
18. The method according to claim 16 , wherein when a relative distance between the first touch point and the first sensor is greater than a relative distance between the second touch point and the first sensor, the left depth parameter corresponding to the first left position index is smaller than the left depth parameter corresponding to the second left position index; and, when the relative distance between the first touch point and the first sensor is smaller than the relative distance between the second touch point and the first sensor, the left depth parameter corresponding to the first left position index is greater than the left depth parameter corresponding to the second left position index.
19. The method according to claim 16 , wherein when a relative distance between the first touch point and the second sensor is greater than a relative distance between the second touch point and the second sensor, the right depth parameter corresponding to the first right position index is smaller than the right depth parameter corresponding to the second right position index; and, when the relative distance between the first touch point and the second sensor is smaller than the relative distance between the second touch point and the second sensor, the right depth parameter corresponding to the first right position index is greater than the right depth parameter corresponding to the second right position index.
20. The method according to claim 14 , wherein the first sensor and the second sensor are depth lenses.
21. The method according to claim 14 , wherein a number of the candidate touch points is equal to a square of a number of the at least two objects.