Multi-Sensitivity Pixel Array for LiDAR Dynamic Range

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Solution Overview

Problem

Conventional distance measurement devices face challenges in increasing dynamic range without complex histogram signal processing.

Innovation Solution

A light reception device with a pixel array comprising pixels of varying sensitivities, including high-sensitivity and low-sensitivity pixels, to detect photons effectively across different light conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If histogram signal processing is used to increase dynamic range, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvedynamic rangeVSAvoidsignal processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The pixel array is segmented into multiple regions with different sensitivities (first pixel region with first sensitivity, second pixel region with second sensitivity). This segmentation allows each region to optimally detect photons in different light quantity conditions, thereby increasing the overall dynamic range without requiring complex histogram signal processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel array are assigned different local qualities (sensitivities) to match different detection needs. The first pixel region has higher sensitivity for low light conditions, while the second pixel region has lower sensitivity for high light conditions. This local quality differentiation enables accurate photon detection across varying light intensities.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If single sensitivity pixels are used, then device complexity is reduced, but adaptability to different light conditions deteriorates

Engineering Contradiction:

Improvelight condition adaptabilityVSAvoidpixel structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The pixel array achieves multi-functionality by incorporating multiple pixel regions with different sensitivities within a single device structure. This universal design enables the device to handle various light quantity conditions (from low to high) using one integrated array, rather than requiring separate devices for different lighting scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Achieves dynamic range expansion without histogram signal processing, ensuring accurate photon detection across varying light intensities.

Implementation Method 1

a photosensitive element configured to generate a signal in response to detection of a photon by the photosensitive element

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Data Source

PatentUS12474451B2Light reception device and distance measurement device

Publication Date: 2025.11.18 SONY SEMICON SOLUTIONS CORP

AI summary

A light reception device comprises a pixel array including a plurality of pixels, each of the plurality of pixels including a photosensitive element configured to generate a signal in response to detection of a photon by the photosensitive element, wherein the plurality of pixels include a first pixel having a first sensitivity to detect a first photon incident on the first pixel and a second pixel having a second sensitivity to detect a second photon incident on the second pixel, wherein the second sensitivity is lower than the first sensitivity.