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Pixel circuit, photoelectric signal acquisition method and system and distance measuring sensor

A pixel circuit and pixel technology, which is applied in the field of ranging sensors, can solve problems such as signal distortion and increased power consumption at the transmitter, and achieve the effects of low power consumption, increased readout speed, and improved ranging accuracy

Pending Publication Date: 2022-08-09
四川创安微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to provide a pixel circuit, a photoelectric signal acquisition method and system, and a distance measuring sensor, which can obtain multiple phase-delayed photoelectric signals that meet the requirements for calculating the distance by only reading one frame of pixels, thereby avoiding the problem caused by multiple frames. The pixel reading operation increases the power consumption of the transmitter, and can also solve the problem of signal distortion that is prone to occur when reading multi-frame signals of moving objects, thereby improving the ranging accuracy

Method used

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  • Pixel circuit, photoelectric signal acquisition method and system and distance measuring sensor
  • Pixel circuit, photoelectric signal acquisition method and system and distance measuring sensor
  • Pixel circuit, photoelectric signal acquisition method and system and distance measuring sensor

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Embodiment 1

[0099] In view of the existing iTOF ranging sensor usually can only collect one or two phase signals from one frame of image, which cannot meet the requirements of the iTOF ranging sensor for phase signals when calculating the phase offset, it is necessary to read multiple frames of images Only enough information for calculating the distance can be obtained, which leads to the problem of increased power consumption of the transmitter and reduced ranging accuracy. In view of these problems, this embodiment proposes a pixel circuit, which aims to simultaneously read and store multiple phase-delayed photoelectric signals, thereby avoiding the need for the transmitter to emit modulated infrared light multiple times due to multiple readings. increase the power consumption, and solve the problem that multi-frame reading is prone to signal distortion for moving objects.

[0100] The pixel circuit provided in this embodiment mainly meets the requirement of the iTOF ranging sensor for ...

Embodiment 2

[0123] This embodiment provides a method for collecting photoelectric signals. The method is based on the pixel circuit of Embodiment 1. The photoelectric signal of a frame of pixels is read out by performing timing control on the pixel circuit, and then the working principle of the pixel circuit of Embodiment 1 is clarified. and process are described.

[0124] This embodiment proposes a readout sequence of a frame of pixels based on the pixel circuit described in Embodiment 1, as follows: figure 2 As shown, it is divided into a global reset period, an exposure period, and a signal readout period. The light wave emitted by the transmitter is sinusoidally modulated infrared light (periodic continuous wave); the gate terminal of the MOS tube is high, indicating that the MOS tube is on; the gate terminal of the MOS tube is low, indicating that the MOS tube is off.

[0125] corresponds to figure 2 The readout sequence of the photoelectric signal acquisition method includes the...

Embodiment 3

[0163] This embodiment proposes a photoelectric collection system corresponding to the photoelectric collection method of the second embodiment, which is used for implementing the photoelectric collection method given in the second embodiment. The system is also based on the pixel circuit of Embodiment 1, and its structure is as follows image 3 shown, including:

[0164] A pixel circuit module for integrating the pixel circuit described in Embodiment 1;

[0165] a global reset module, used for adjusting the switching states of each MOS transistor in the pixel circuit before exposure, and performing a global reset on the pixel circuit;

[0166] The circuit adjustment module is used to adjust the switch state of each transmission control MOS tube according to the current phase interval in which the modulated infrared light is located in each phase interval of each phase cycle of the modulated infrared light during exposure, so as to make the global reset circuit Only the pixe...

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Abstract

The invention discloses a pixel circuit, a photoelectric signal acquisition method and system and a distance measuring sensor, and the pixel circuit comprises a global reset circuit and four pixel reading circuits with the same structure, and the four pixel reading circuits are in one-to-one correspondence with four phase intervals in a modulation infrared light phase period. The pixel circuit is controlled to read four phase signals at the same time by adjusting the on-off state of each MOS tube in each pixel reading circuit, and a sufficient number of phase delay photoelectric signals can be obtained for calculating the distance only by reading one frame of pixels. The power consumption increase of the transmitting end caused by multi-frame pixel reading operation can be avoided, the problem of signal distortion is avoided, and the distance measurement precision is further improved.

Description

technical field [0001] The present invention relates to the technical field of photoelectric signal acquisition, in particular, to a pixel circuit, a photoelectric signal acquisition method and system, and a ranging sensor. Background technique [0002] At present, the ranging sensors on the market are mainly based on two types of methods for ranging, one is dTOF (direct Time-of-Flight, which directly measures the time of flight), and the other is iTOF (indirect Time-of-Flight, indirect time-of-flight). measure the time of flight of light). [0003] Among them, iTOF indirectly measures the time-of-flight of light by measuring the phase shift. The core of the iTOF module includes a transmitter and a receiver. The transmitting end is usually a VCSEL laser, which is mainly responsible for emitting modulated infrared light of a specific frequency; the receiving end is usually an image sensor, which receives the reflected light during the exposure time and performs photoelectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/4913G01S17/08
CPCG01S7/4913G01S17/08
Inventor 不公告发明人
Owner 四川创安微电子有限公司