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Systems and methods for modulated image capture

A technique for modulating voltage and pixel elements, applied in the image capture system, the field of the first conductivity type mobile charge associated with the photon flux, which can solve the problems of limitation and increased power consumption

Active Publication Date: 2019-11-08
科维塔公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases power consumption, and eye safety regulations limit the possibility of continuously emitting enough light to significantly improve SBR

Method used

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  • Systems and methods for modulated image capture
  • Systems and methods for modulated image capture
  • Systems and methods for modulated image capture

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Experimental program
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Embodiment Construction

[0093] The following detailed description illustrates embodiments of the disclosure and the manner in which they can be implemented. Although certain modes of carrying out the disclosure have been disclosed, those skilled in the art will recognize that other embodiments for carrying out or practicing the disclosure are also possible.

[0094] In a first aspect, an embodiment of the present disclosure provides a pixel element, including:

[0095] - A semiconductor substrate of a first conductivity type or a second conductivity type, the semiconductor substrate having a front side and a back side, wherein the semiconductor substrate is configured to be exposed to a photon flux and to convert the photon flux to the first conductivity type mobile charges and second conductivity type mobile charges;

[0096] - a first primary charge collecting node of a first conductivity type semiconductor material arranged on the front side of the semiconductor substrate;

[0097] - at least on...

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Abstract

Disclosed is a pixel element comprising a semiconductor substrate, a primary charge-collection node, a peripheral node, a modulating node, a circuitry and a backside conductive layer. The semiconductor substrate is configured to convert a flux of photons to first and second conductivity- type mobile charges. The peripheral node at least partially surrounds the primary charge-collection node, whichat least partially surrounds the modulating node. The circuitry is used to connect and disconnect a reset voltage to / from the primary charge-collection node, provide a peripheral node voltage to theperipheral node, and measure an amount of the first conductivity-type mobile charges collected by the primary charge- collection node. The modulating node is electrically connected to a modulating voltage source, which is independent of the peripheral node voltage. The backside conductive layer is configured to collect and conduct the second conductivity-type mobile charges, and configured to be electrically connected to a bias voltage.

Description

technical field [0001] The present disclosure relates generally to pixel elements and image sensors; more specifically, to systems for capturing images. Furthermore, the present disclosure also relates to methods for measuring the amount of mobile charge of a first conductivity type associated with a flux of photons received by a pixel element. Background technique [0002] The ability to rapidly direct charges generated in an image sensor to multiple collection nodes is a critical operation, for example, in time-of-flight (ToF) imaging. Switching between harvesting nodes can be done with conventional CMOS transistors, or by directing the charge within the sensor itself. For example, a pinned photodiode may be used, and a CMOS switching transistor may be used to select the capacitor that stores the charge for a given time. In a bridge circuit, current from a photodiode is sampled to a capacitor such that the polarity of the capacitor alternates between each cycle. In a mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/486H01L27/146G01S7/4861
CPCG01S7/4861H01L27/146H04N25/70H01L27/1461H01L27/14643
Inventor J·波伊科宁A·帕西奥M·莱希奥
Owner 科维塔公司