A device for detecting light intensity, a display screen and a mobile terminal are provided. The device for detecting light intensity includes a controller, and a first photosensitive sensor and a second photosensitive sensor which are electrically coupled to the controller, the first photosensitive sensor and the second photosensitive sensor being spaced apart and located in a same illumination environment, and the controller is configured to, when an external beam illuminates the first photosensitive sensor, perform calculation based on a difference value between illumination parameters of the first photosensitive sensor and the second photosensitive sensor to obtain a light intensity of the external beam.

A system and method with AC coupling that reserves photodiode bandwidth in a biased configuration, allows optimal transimpedance amplifier performance, retains DC signal measurement capability, and does not introduce noise into the balanced detection signal.

In an illuminance sensor, a slow axis of a first portion comprises a relation of +45 or 45 in regard to a first polarization direction that is a polarization direction of the a linear polarization plate, a relation of a slow axis of a second portion in regard to the first polarization direction is 45 or +45 that is opposite in sign to the relation of the slow axis of the first portion in regard to the first polarization direction, and a slow axis of a second quarter-wave plate comprises a relation of +45 or 45 in regard to a second polarization direction that is a polarization direction of a second linear polarization plate, wherein the relation of the slow axis of the second quarter-wave plate in regard to the second polarization direction is the same with the relation of the slow axis of the first portion in regard to the first polarization direction.

An optical difference detector includes a first APD and a second APD, a first voltage application unit that applies a first bias voltage to the first APD and a second voltage application unit that applies a second bias voltage to the second APD, a differential amplifier that is connected in parallel to the first APD and the second APD and amplifies a difference between a first signal current output from the first APD and a second signal current output from the second APD, and a feedback control unit that controls the second bias voltage so that a low frequency component of a first monitoring current in the first APD and a low frequency component of a second monitoring current in the second APD are equal.

An infrared detector includes: a first light receiving layer having a first cutoff wavelength; a second light receiving layer having a second cutoff wavelength longer than the first cutoff wavelength; an intermediate filter layer having a third cutoff wavelength that is the same as or longer than the first cutoff wavelength and the same as or shorter than the second cutoff wavelength, the intermediate filter layer being disposed between the first light receiving layer and the second light receiving layer; a first barrier layer disposed between the first light receiving layer and the intermediate filter layer; and a second barrier layer disposed between the second light receiving layer and the intermediate filter layer.

An ambient light detector, a detector array and a method are disclosed. In an embodiment an ambient light sensor includes a first plurality of sensor elements, each sensor element configured to provide a signal in response to a level of illumination and a second plurality of reference elements, each reference element configured to provide a reference signal and each including a blocking element configured to shield the respective reference element from being illuminated, wherein the first plurality is larger than the second plurality and the first plurality of sensor elements and the second plurality of reference elements are arranged in an array, and wherein a sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact.

An ambient light detector, a detector array and a method are disclosed. An ambient light sensor includes a first plurality of sensor elements, where each sensor element is configured to provide a signal in response to a level of illumination and a second plurality of reference elements, each reference element configured to provide a reference signal and each including a blocking element configured to shield the respective reference element from being illuminated, where the first plurality is larger than the second plurality and the first plurality of sensor elements and the second plurality of reference elements are arranged in an array, and where a sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact.

The present disclosure provides a photosensor structure including a left photosensor located at the left side of a front windshield of a vehicle viewed from the outside of the vehicle, and a right photosensor located symmetrically to the left photosensor. For example, the left photosensor includes two light reception windows located in a width direction of the vehicle to set a lateral incidence angle having a maximum incidence amount in a left-and-right direction of a light source, a dummy portion located on at least one of the two light reception windows between the two light reception windows to set an incidence altitude having a maximum incidence amount in an upward-and-downward direction of the light source, and light reception units located on lower ends of the light reception windows to measure the amount of light received from the light source through the light reception windows.

An optical measurement device includes a light source, a first detector, and a second detector. The light source emits light to a measurement site of a patient and one or more detectors detect the light from the light source. At least a portion of a detector is translucent and the light passes through the translucent portion prior to reaching the measurement site. A detector receives the light after attenuation and/or reflection or refraction by the measurement site. A processor determines a light intensity of the light source, a light intensity through a tissue site, or a light intensity of reflected or refracted light based on light detected by the one or more detectors. The processor can estimate a concentration of an analyte at the measurement site or an absorption or reflection at the measurement site.

In a first pixel part, as an incident position is closer to a first end of a first pixel pair group in a second direction, an intensity of a first electric signal decreases. In a second pixel part, as the incident position is closer to the first end, an intensity of a second electric signal increases. In a third pixel part, as the incident position is closer to a second end of a second pixel pair group in a first direction, an intensity of a third electric signal decreases. In a fourth pixel part, as the incident position is closer to the second end, an intensity of a fourth electric signal increases. A calculation unit performs weighting on a first position on the basis of the third and fourth electric signals, and performs weighting on a second position on the basis of the first and second electric signals.