Abstract: A proximity sensor includes a light source, an optical sensing element, and an integration circuit. The light source is turned on and off several times during a measurement time interval. When the light source is turned on and off, the optical sensing element senses the surrounding light to generate a first current and a second current, respectively. The integration circuit integrates the first current and the second current to generate a first integration signal and a second integration signal respectively for determining whether an object is approaching. When the light source is turned on, the present second integration signal is stored, and a stored first integration signal is used as a starting value to integrate the first current. When the light source is turned off, the present first integration signal is stored, and the stored second integration signal is used as a starting value to integrate the second current.

Abstract: A high-sensitivity light sensor includes a light sensing element, a first integrator, a comparator, and a second integrator. The light sensing element senses a light during a measurement time interval to generate a current. The first integrator integrates the current to generate a first integration signal. The comparator compares the first integration signal with a threshold value. While the first integration signal is greater than the threshold value, the comparison signal is at a first level. The second integrator is coupled to the first integrator and integrates the first integration signal to generate a second integration signal. The light sensor of the present invention uses two integrators to integrate the sensed voltage twice. Therefore, the light sensor of the present invention has a higher sensitivity.

Abstract: A proximity sensor includes a light source, an optical sensing element, and an integration circuit. The light source is turned on and off several times during a measurement time interval. When the light source is turned on and off, the optical sensing element senses the surrounding light to generate a first current and a second current, respectively. The integration circuit integrates the first current and the second current to generate a first integration signal and a second integration signal respectively for determining whether an object is approaching. When the light source is turned on, the present second integration signal is stored, and a stored first integration signal is used as a starting value to integrate the first current. When the light source is turned off, the present first integration signal is stored, and the stored second integration signal is used as a starting value to integrate the second current.

Abstract: A high-sensitivity light sensor includes a light sensing element, a first integrator, a comparator, and a second integrator. The light sensing element senses a light during a measurement time interval to generate a current. The first integrator integrates the current to generate a first integration signal. The comparator compares the first integration signal with a threshold value. While the first integration signal is greater than the threshold value, the comparison signal is at a first level. The second integrator is coupled to the first integrator and integrates the first integration signal to generate a second integration signal. The light sensor of the present invention uses two integrators to integrate the sensed voltage twice. Therefore, the light sensor of the present invention has a higher sensitivity.