Light receiving element and distance measuring module

By symmetrically arranging transmission gates and overflow gates in the optical receiving element, the problem of uneven parasitic light sensitivity is solved, thereby improving the performance of the optical receiving element and the reliability of the ranging module.

CN114667607BActive Publication Date: 2026-07-03SONY SEMICON SOLUTIONS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SONY SEMICON SOLUTIONS CORP
Filing Date
2020-11-19
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing gate-type indirect ToF sensors, the symmetrical arrangement of the floating diffusion transmission gates leads to uneven parasitic light sensitivity, which affects the performance of the light receiving element.

Method used

Multiple transmission gates are used to distribute and transmit the signal charge in the photodiode to multiple floating diffusers, and these transmission gates are arranged symmetrically with respect to the optical center point. Multiple overflow gates are combined to ensure uniform charge transfer and high robustness.

Benefits of technology

This achieves uniform reduction of parasitic light sensitivity in the optical receiving element, improves robustness against transmission failures, maintains in-plane uniformity, and enhances the accuracy and reliability of the ranging module.

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Abstract

The ranging module includes: a light receiving element having multiple transmission gates that distribute and transmit the signal charge accumulated in the photodiode of the incident light to multiple floating diffusers, wherein at least two of the multiple transmission gates are arranged symmetrically with respect to the optical center point when viewed from the incident direction of the light; a light emitting part that emits illumination light with periodically varying brightness; and a light emitting control unit that controls the illumination timing of the illumination light.
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Citation Information

Patent Citations

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    JP2019001494A

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    JP2012109808A

  • Charge modulation element and solid-state imaging device

    US20170171485A1

  • Image sensor measuring distance

    US20180366504A1