Patent ID: 9134844
Filing Date: 2015-09-15
Classification: G06F,Y02D

Abstract:
1. An optical touchpad comprising: a light source for emitting a specific-light; a specific-light sensing array for sensing reflected light of the specific-light reflected by an instruction object to generate a signal of a specific-light sensing image that indicates that the reflected light of the specific-light reflected by the instruction object is sufficient for the specific-light sensing array to sense the specific-light sensing image; a proximity detector for determining an instruction distance between the instruction object and the optical touchpad according to the signal intensity of the specific-light sensing image, wherein the higher the signal intensity of the specific-light sensing image, the closer the instruction distance is, up to the instruction object contacting the optical touchpad, and the proximity detector generates a control signal according to the signal intensity of the specific-light sensing image; a motion detector independent from the proximity detector for determining a motion path of the instruction object according to motion of the signal of the specific-light sensing image over the specific-light sensing array for outputting an instruction object motion signal; an environmental light sensing array for sensing light near the optical touchpad to output a signal of an environmental light sensing image; and an environmental light detector for adjusting intensity of the specific-light emitted by the light source according to the signal of the environmental light sensing image, wherein the signal of the environmental light sensing image represents intensity of light near the optical touchpad; wherein when the signal intensity of the specific-light sensing image weakens to less than a predetermined value while still being strong enough for the specific-light sensing array to sense the reflected light of the specific-light reflected by the instruction object, the proximity detector determines that the instruction distance is too great, and the proximity detector issues the control signal to the motion detector to turn off the motion detector while keeping the proximity detector and the environmental light detector turned on, and when the motion detector is turned on, the environmental light detector is turned off.