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Light detection device and electronic apparatus

A light detection device and photon detection technology, which is applied in the direction of measuring devices, circuits, electrical components, etc., can solve the problems of single photon detection efficiency increase

Pending Publication Date: 2020-12-11
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the detection efficiency of a single photon (Photon) increases

Method used

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  • Light detection device and electronic apparatus
  • Light detection device and electronic apparatus
  • Light detection device and electronic apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] Hereinafter, for Embodiment 1 of the present invention, if according to Figure 1 to Figure 8 It will be described as follows. figure 1 It is a block diagram showing an example of the structure of the photodetection device 101 according to Embodiment 1 of the present invention.

[0043] The photodetection device 101 of the first embodiment is, for example, figure 1 As shown, it includes VCSEL driver 102, VCSEL103 (light emitting part), SPAD array 104 (first SPAD array) on the reference side, SPAD array 105 (second SPAD array) on the return side, SPAD front-end circuit 106 on the reference side, return side SPAD front-end circuit 107, SPAD photon detection rate control part 108, HV generating circuit 109 (voltage generating part), TDC110, histogram generating circuit 111, distance calculation circuit 112, data register 113, and SPAD bias control module 114 (voltage adjustment department).

[0044] The photodetection device 101 is a distance measuring sensor of the T...

Embodiment approach 2

[0125] For other embodiments of the present invention, if based on Figure 9 The description is as follows. In addition, for the sake of convenience of description, the same reference numerals are attached to the members and members having the same functions as those described in the above-mentioned first embodiment, and the description thereof will be omitted.

[0126] For the operation of the photodetection device 101 of the second embodiment, use Figure 9 Be explained. Figure 9 It is a sequence diagram showing the operation of the photodetection device 101 according to Embodiment 2 of the present invention.

[0127] In the photodetection device 101 of the second embodiment, only the SPAD photon detection rate setting period 501C' is different from the photodetection device 101 of the above-mentioned first embodiment.

[0128] In the SPAD photon detection rate setting period 501C' of this embodiment, the emission intensity of the VCSEL 103 is gradually increased until t...

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Abstract

The invention aims to achieve a light detection device and an electronic apparatus that have high accuracy of a detection distance even in a case of a detection object at a short distance or a detection object having high reflectivity, for example, by controlling SPAD photon detection rates by using a SPAD photon detection rate controller. The light detectino device comprises a first SPAD array onwhich at least one first light beam that is at least one pulse light beam is incident and which is operated in Geiger mode, a second SPAD array on which at least one second light beam resulting fromthe at least one first light beam reflected by a detection object is incident and which is operated in Geiger mode, a voltage generation unit that applies a reverse bias voltage to the first SPAD array and the second SPAD array, and a SPAD photon detection rate controller that adjusts and controls a SPAD photon detection rate in accordance with a first photon detection rate indicating a rate of the number of at least one pulse signal output by the second SPAD array upon incidence of the at least one second light beam relative to the number of the at least one pulse light beam are included.

Description

technical field [0001] The present invention relates to a photodetection device utilizing an avalanche effect, and electronic equipment. Background technique [0002] In recent years, portable information terminals such as smartphones have spread widely. In addition, various sensors are gradually mounted on various portable information terminals due to miniaturization of cameras, proximity sensors, orientation sensors, acceleration sensors, angular velocity sensors, and illuminance sensors. For autofocus (AF) of a camera built into a smartphone, conventionally, a method of autofocusing the camera by utilizing the contrast of an image has generally been used. However, in AF using the contrast of an image, when the contrast of the object to be photographed is low, such as in a dark place, there is a disadvantage that the AF speed is extremely reduced and the focus of the lens progresses slowly. Therefore, there is a desire for a compact and high-speed ranging sensor capable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/48
CPCG01S17/48G01S17/10G01S7/4863G01S7/484H01L31/107H01L31/0203H01L31/02325H01L31/173
Inventor 清水隆行平松卓磨生田吉纪佐藤秀树
Owner SHARP KK