Optical sensor system
An optical sensor system is disclosed. The optical sensor system comprises a panel and a sensing unit. The panel comprises a plurality of transparent areas. The sensing unit locates at one side of the panel and the sensing unit senses a plurality of first light signals reflected by an object and senses a plurality second light signals of an ambient light. The reflected first light signals and the second light signals pass through one of the plurality of transparent areas of the panel. The sensing unit further comprises a light sensor and a plurality of gesture sensors. The light sensor locates at the center of the sensing unit, and the light sensor senses the second light signals. The plurality of gesture sensors surrounds the light sensor, and the gesture sensors senses the reflected first light signals and then produce gesture signals corresponding to motions of the object.
1. An optical sensor system, comprising:
a panel comprising a plurality of transparent areas; and
a sensing unit being located at one side of the panel and sensing a plurality of first light signals reflected by an object and sensing a plurality second light signals of an ambient light, the reflected first light signals and the second light signals passing through one of the plurality of transparent areas, and the sensing unit further comprising:
a light sensor being located at the center of the sensing unit, and the light sensor sensing the second light signals; and
a plurality of gesture sensors being independent of the light sensor and surrounding the light sensor, and the gesture sensors sensing the reflected first light signals and producing gesture signals corresponding to motions of the object, wherein one of the plurality of transparent areas is arranged on top of the light sensor at the center of the sensing unit.
2. The optical sensor system as claimed in claim 1 , further including a processing unit having an activate threshold (A_THD), the processing unit triggering a gesture signal calculation if the reflected first light signals sensing by the sensing unit is larger than the A_THD.
3. The optical sensor system as claimed in claim 1 , wherein the plurality of gesture sensors comprises an up PD (UPD) and a down PD (DPD) being separately configured to surround the light sensor peripherally.
4. The optical sensor system as claimed in claim 3 , wherein when the gesture signal calculation is triggered by a processing unit, the processing unit further determines the direction of gesture according to the following equations:
f ( y )=(V UPD −V DPD )/(V UPD +V DPD );
wherein V UPD and V DPD are voltage signals generated by sensing the reflected first light signals by UPD and DPD respectively.
5. The optical sensor system as claimed in claim 4 , wherein the processing unit further has UPD threshold (U_THD) and DPD threshold (D_THD); wherein when f(y) <−U_THD and then f(y)>D_THD, the direction of gesture is determined and reported as a first longitudinal direction by the processing unit; and when f(y)>U_THD and then f(y)<−D_THD, the direction of gesture is determined and reported as a second longitudinal direction by the processing unit.
6. The optical sensor system as claimed in claim 1 , wherein the plurality of gesture sensors comprises a left PD (LPD) and a right PD (RPD) being separately configured to surround the light sensor peripherally.
7. The optical sensor system as claimed in claim 6 , wherein when the gesture signal calculation is triggered by a processing unit, the processing unit further determines the direction of gesture according to the following equations:
f ( x )=(V LPD −V RPD )/(V LPD +V RPD );
wherein V LPD and V RPD are voltage signals generated by sensing the reflected first light signals by LPD and RPD respectively.
8. The optical sensor system as claimed in claim 7 , wherein the processing unit further has LPD threshold (L_THD) and RPD threshold (R_THD); wherein when f(x)<−L_THD and then f(x)>R_THD, the direction of gesture is determined and reported as a first lateral direction by the processing unit; when f(x)>L_THD and then f(x)<−R_THD, the direction of gesture is determined and reported as a second lateral direction by the processing unit.
9. The optical sensor system as claimed in claim 1 , wherein the first light signals are emitted from a light emitting unit located at the same side as the sensing unit of the panel.
10. The optical sensor system as claimed in claim 9 , wherein the light emitting unit comprises infrared light emitting diodes (IR LEDs).
11. The optical sensor system as claimed in claim 1 , wherein the reflected first light signals are non-visible light signals.
12. The optical sensor system as claimed in claim 1 , wherein the light sensor is a single light sensor or a mosaic tile sensor array.
13. The optical sensor system as claimed in claim 12 , wherein the mosaic tile sensor array includes a plurality of light sensor cells selected from the group consisting of red sensor cell, green sensor cell, blue sensor cell, white sensor cell, UV sensor cell and IR sensor cell.
14. The optical sensor system as claimed in claim 1 , wherein the sensing unit further has a multi-cavity optical filter being stacked thereon, and the multi-cavity optical filter filters the reflected first light signals and the second light signals passing through one of the plurality of transparent areas.