Light detecting unit, detecting method thereof and light detecting device

Abstract

The invention discloses a light detecting unit, a detecting method thereof and a light detecting device. The light detecting unit comprises a first sensing module, a second sensing module, a light shielding module and a comparison output module. The first sensing module is connected to a first control signal line. The second sensing module is connected to a second control signal line. The first sensing module and the second sensing module have the same structure and are used for sensing environment where the first sensing module and the second sensing module are located and outputting corresponding voltage signals. The light shielding module covers at least a part of the first sensing module to shield the influence of the ambient light on the output of the first sensing module. The comparison output module is used for calculating a voltage difference between a voltage signal outputted by the second sensing module and a voltage signal outputted by the first sensing module and outputtinga signal corresponding to the voltage difference to a voltage output end, and the voltage difference is a representation of the illumination intensity of the ambient light. According to the technicalscheme of the invention, the accurate detection of illumination intensity received by the second sensing module can be achieved.

Description

technical field [0001] The invention relates to the technical field of light detection, in particular to a light detection unit, a detection method thereof, and a light detection device. Background technique [0002] Existing photodetection circuits are generally based on phototransistors, and their working principles are roughly as follows: First, the phototransistor generates a corresponding electrical signal according to the light intensity of the ambient light; then, based on the electrical signal, the corresponding light intensity value is determined by looking up a table . However, in practical applications, it is found that the output of the phototransistor is not only affected by the intensity of light, but also affected by external environments such as temperature, circuit noise, and stray capacitance. Therefore, the electrical signal actually output by the phototransistor cannot accurately represent the light intensity of the ambient light, resulting in low light ...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that the output of the phototransistor is not only affected by the intensity of light, but also by the external environment such as temperature, circuit noise, stray capacitance, etc.

Therefore, the electrical signal actually output by the phototransistor cannot accurately represent the light intensity of the ambient light, resulting in low light detection accuracy

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