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Optical detector

A technology of photodetectors and photoreceptors, which is applied in the field of photosensors, can solve the problems of poor anti-interference ability of photodetectors, achieve the effects of enhancing anti-interference ability, improving sensitivity, and solving poor anti-interference ability

Active Publication Date: 2015-11-25
SEMICON MFG INT (SHANGHAI) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a photodetector to solve the problem of poor anti-interference ability of the photodetector

Method used

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Embodiment Construction

[0024] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0025] According to an embodiment of the present invention, a photodetector is provided, figure 2 is a schematic circuit diagram of a photodetector according to an embodiment of the present invention.

[0026] Such as figure 2 As shown, the photodetector includes: a first photosensitive device D1, a second photosensitive device D2 and a comparator C.

[0027] The first photoreceptor D1 is used to detect light signals to obtain detection signals. A cover layer for isolating optical signals is provided outside the second photoreceptor D2 for providing reference signals. The detection signal obtained by the first photoreceptor D1 and the reference signal provided by the second photoreceptor ...

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Abstract

The present invention discloses an optical detector. The optical detector comprises: a first photosensitive device that is used for detecting an optical signal to obtain a detection signal; a second photosensitive device, wherein a cover layer used for isolating the optical signal is disposed at an exterior side of the second photosensitive device, and the second photosensitive device is used for providing a reference signal; and a comparator that is used for obtaining a logic control signal according to the detection signal and the reference signal, wherein the comparator comprises: a first input end, a second input end and an output end; the first input end is connected with the first photosensitive device and is used for inputting the detection signal; the second input end is connected with the second photosensitive device and is used for inputting the reference signal; and the output end is used for outputting the logic control signal. According to the optical detector provided by the present invention, an interference resistance effect can be enhanced.

Description

technical field [0001] The invention relates to the field of photosensors, in particular to a photodetector. Background technique [0002] Conventional photodetector or photosensor circuits usually use pixel units to detect high-intensity light, and then output a logic signal (logicsignal), which is related to the intensity of the light. In the security application of smart cards such as bank cards, in order to prevent illegal personnel from obtaining the data information in the bank card by dismantling the card, a light detector or light sensor is usually used to detect the light signal, and when the light signal is detected, the output level signal The internal data information of the bank card is destroyed by short-circuiting the internal circuit of the bank card, so that some illegal personnel cannot obtain the data information in the bank card after the card is opened. However, the size of the chip in the pixel unit circuit of the traditional photodetector or photosens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/86
Inventor 王昕宇周世聪倪昊
Owner SEMICON MFG INT (SHANGHAI) CORP