Gesture sensing module
An exemplary embodiment of the present disclosure illustrates a gesture sensing module disposed on a substrate. The gesture sensing module includes at least one light emitting unit, at least one light sensor, and a control circuit. The light emitting unit provides a light to illuminate a sensing area, wherein a central optical axis of the light forms an angle with a normal vector of the substrate, and the angle is not equal to 0. The light sensor senses a reflection light which a target in the sensing area reflects the light, and generate a sensing signal according to the reflection light. The control circuit coupled to the light sensor and the light emitting unit determines a traveling direction of the target according to the sensing signal.
1. A gesture sensing module, disposed on a substrate, comprising:
at least one light emitting unit, providing a light to irradiate a sensing area, wherein a central optical axis of the light forms an angle with a normal vector of the substrate, and the angle is not equal to 0;
at least one light sensor, sensing a reflection light which a target in the sensing area reflects the light, and generating a sensing signal according to the reflection light; and
a control circuit, coupled to the light sensor and the light emitting unit, determining a traveling direction of the target according to the sensing signal;
wherein the substrate has a inclined surface, and the light emitting unit is disposed on the inclined surface of the substrate, such that the angle formed by the central optical axis of the light and the normal vector of the substrate is not equal to 0.
2. The gesture sensing module according to claim 1 , wherein the control circuit determines the traveling direction of the target according to a slope within a rising time of the sensing signal and a slope within a falling time of the sensing signal.
3. The gesture sensing module according to claim 1 , wherein the control circuit determines the traveling direction of the target according to a proportion of a rising time to a falling time of the sensing signal.
4. The gesture sensing module according to claim 1 , wherein the control circuit determines the traveling direction of the target according to a brightness integral value within a rising time of the sensing signal and a brightness integral value within a falling time of the sensing signal.
5. The gesture sensing module according to claim 1 , wherein the angle formed by the central optical axis of the light and the normal vector of the substrate is 20 degree or −20 degree.
6. The gesture sensing module according to claim 1 , further comprising:
a first optical lens, disposed above the light sensor, receiving the reflection light, and focusing the reflection light on the light sensor.
7. The gesture sensing module according to claim 1 , wherein the light sensor comprises at least one photo diode.
8. The gesture sensing module according to claim 1 , further comprising:
a second optical lens, disposed above the light emitting unit, wherein a center point of an orthographic projection of the second optical lens and a center point of an orthographic projection of the light emitting unit are non-overlapped, such that the angle formed by the central optical axis of the light and the normal vector of the substrate is not equal to 0.