![]() In some embodiments, the sensor elements and the reference elements are arranged in an array, such that a ratio of sensor elements and reference elements along an edge of the array corresponds to a ratio between the first plurality and the second plurality. The number of sensor and reference elements may be different. In some other aspects, the sensor elements and/or the reference elements each comprise a well arranged in the common substrate to form an active layer between the well and the common substrate. The sensor elements and the reference elements may each comprise a p-doped layer, an n-doped layer and an active area in between configured to generate the signal when being illuminated. The portion of the sensor element covered by the blocking element may be between 5% and 50% of a total sensor area of the sensor element, and particular between 5% and 10%. The blocking element may in some instances extend over a portion of a sensor element of the first plurality of sensor elements adjacent to the reference element. For instance, the blocking element may completely cover the respective reference element and further extends laterally between a space between the reference elements and an adjacent sensor element of the first plurality of sensor elements. In some embodiment, the blocking element from a top view is larger than an area occupied by the respective reference element. This can be for instance achieved by contact via through the common substrate. In some embodiments, the common contact is arranged on a surface of the common layer substrate facing away from the blocking element. Alternatively, those contacts can be arranged on a surface facing away from the blocking element. ![]() Further, second contacts for the sensor elements can be arranged on a surface of the sensor elements facing the blocking element. In an aspect, second contacts for the reference elements are arranged on a surface of the reference elements facing the blocking element. A sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact. Sensor elements and reference elements are arranged in an array. The number of sensor elements is larger than the number of reference elements. In another aspect, an ambient light sensor, comprises a first sensor elements, each sensor element configured to provide a signal in response to a level of illumination and reference elements, each reference element configured to provide a reference signal and each reference element comprising a blocking element configured to shield the respective reference element from being illuminated. Further, a sensor element and a reference element are laterally arranged in a common substrate sharing at least one common contact. 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. The ambient light sensor comprises a second plurality of reference elements, each reference element configured to provide a reference signal and comprising a blocking element to shield the reference element from being illuminated. The sensor signal can be proportional to the illumination level. In other words, each sensor element is configured to provide a signal in response to light illumination. In an aspect, the ambient light sensor comprises a first plurality of sensor elements, each sensor element configured to provide a signal when being illuminated by light. SUMMARYĮmbodiments provide an ambient light sensor with improved dark current compensation. To provide better measurement result with ambient light sensor, it is desirable to reduce the impact of dark current in such sensors. The dark current can be increased by heating of the photodiodes and correspondingly reduced when the diode is cooled down. It is a temperature depending characteristics of semiconductors. The dark current consists of charge carriers generated in the detector when the detector is not illuminated by incoming light. An ALS may include a photodiode array and a current amplifier.ĭark current is the relatively small electric current that flows through photosensitive devices, such as photodiodes, even when no photons are entering the device. The output may then be used to control the strength or colour temperature of a lighting device. BACKGROUNDĪn Ambient Light Sensor (ALS) is an electronic device that measures intensity of an ambient illumination and outputs an electrical signal proportional to the level of illumination. The application also refers to an ambient light detector, a detector array and a method of forming an ambient light sensor. The present application concerns an ambient light detector.
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