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Optical sensing device

A technology of optical sensing and light sensing, which is applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve the problems of increased manufacturing cost and large circuit area, and achieve the effect of reducing circuit area and reducing manufacturing cost

Pending Publication Date: 2022-07-05
EGIS TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In the past, to integrate TOF chips and ambient light sensing chips, two different photosensitive diodes (Single-Photon Avalanche Diode (Single-Photon Avalanche Diode) and Ambient Light Sensing Diode (Ambient Light Sensing Diode) and corresponding circuit amplifiers were used. In the way of the same chip, since the circuit area occupied by two different photodiodes is very large, this method will lead to a substantial increase in manufacturing costs

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  • Optical sensing device
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Embodiment Construction

[0014] In order to make the content of the present invention more comprehensible, the following specific embodiments are taken as examples by which the present invention can indeed be implemented. In addition, where possible, components / components using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0015] Please refer to the following figure 1 , figure 1 It is a schematic diagram of an optical sensing device according to an embodiment of the present invention. The optical sensing device 100 may include a bias voltage generating circuit 102, a photo-sensing diode PD1, and a quenching circuit 104. The bias voltage generating circuit 102 is coupled to the cathode of the photo-sensing diode PD1, and the quenching circuit 104 is coupled to the photo-sensing diode. Anode of diode PD1. The quenching circuit 104 may be active or passive, which is not limited in the present invention. The bias voltage generating circuit 102 can p...

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Abstract

The invention provides an optical sensing device. The bias voltage generating circuit provides a first bias voltage and a second bias voltage to the light sensing diode respectively when the optical sensing device is in a first mode and a second mode, so that the light sensing diode provides a flight time ranging signal and an ambient light sensing signal respectively. The quenching circuit provides a fly-time ranging signal to the ranging signal processing circuit in a first mode and quench the light sensing diode, and provides an ambient light sensing signal to the light sensing signal processing circuit in a second mode.

Description

technical field [0001] The present invention relates to a sensing device, and in particular, to an optical sensing device. Background technique [0002] Integrated chips (ICs) with photonic devices exist in many modern electronic devices. For example, photonic devices including image sensors are used in cameras, video recorders, and other types of photography systems to capture images. Photonic devices are also widely used in other applications such as depth sensors used in time-of-flight (TOF) systems to determine the distance between the sensor and the target object. The depth sensor of the TOF system can be used in smartphones (eg, facial recognition and camera focusing), automobiles, drones, robots, etc. [0003] In the past, to integrate the TOF chip and the ambient light sensing chip, two different photodiodes (Single-Photon Avalanche Diode and Ambient LightSensing Diode) were used with corresponding circuit amplifiers. In the method of the same chip, since the circ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08G01S17/894G01S7/48G01S7/481
CPCG02B3/08G01J1/44G01J1/4204G01J2001/442G01J2001/4466G01S7/4861G01S17/08
Inventor 胡耀升谢晋安陈经纬
Owner EGIS TECH