Light Gating Layer for Multi-Sensitivity Optical Sensing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional optical sensors have fixed light sensitivity, which limits their ability to handle varying light conditions, leading to signal saturation near light sources.

Innovation Solution

The optical sensing system incorporates a light gating layer with multiple polarizer layers, allowing for adjustable light sensitivity by controlling the amount of input light received by the pixel array.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional optical sensor uses a fixed light sensitivity, then the device complexity is low, but the sensor cannot adapt to varying light conditions and experiences signal saturation near light sources

Engineering Contradiction:

Improvelight sensitivity adjustmentVSAvoidsensor structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The light gating layer is segmented into multiple polarizer layers (first polarizer layer and second polarizer layer), each with different transmission characteristics. This segmentation allows the sensor to achieve multiple light sensitivity levels by selectively controlling which polarizer layers are active, thereby adapting to varying light conditions without requiring a completely different sensor structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a light gating layer with controllable polarizer layers that can dynamically adjust light transmission. By switching between different polarizer configurations, the sensor's light sensitivity becomes dynamic rather than fixed, enabling adaptation to different lighting environments while maintaining a relatively simple overall sensor structure.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the optical sensor receives strong light or is close to a light source, then the sensing signals saturate, but reducing light sensitivity limits the sensor's ability to capture sufficient light in normal conditions

Engineering Contradiction:

Improvesignal accuracyVSAvoidlight condition range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the optical parameters of the light gating layer by using multiple polarizer layers with different transmission characteristics. By adjusting which polarizer layers are activated and their relative orientations, the system can change the light transmission parameter to prevent saturation in strong light while ensuring sufficient light capture in normal conditions, thereby improving signal accuracy across a wide range of light conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The light gating layer acts as an intermediary between the incoming light and the optical sensor. It mediates the light transmission by selectively blocking or passing light through different polarizer layers, preventing direct saturation of the sensor while ensuring adequate light reaches the sensor in normal conditions. This intermediary structure protects the sensor from harmful strong light while maintaining adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If a single polarizer layer is used in the light gating layer, then the device complexity is low, but the sensor cannot achieve multiple light sensitivities

Engineering Contradiction:

Improvenumber of light sensitivitiesVSAvoidnumber of polarizer layers

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple polarizer layers (first polarizer layer and second polarizer layer) into a single integrated light gating layer structure. This combination allows the system to achieve multiple light sensitivity levels by controlling the interaction between different polarizer layers, rather than requiring separate sensor systems for each sensitivity level. The merged structure provides multi-sensitivity capability while maintaining a compact and relatively simple overall device architecture.

Inventive Principle:

Principle #5Merging (Combining)

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

This solution enables the optical sensor to have multiple light sensitivities, effectively preventing signal saturation and improving performance in diverse lighting conditions.

Implementation Method 1

a first polarizer layer, comprising a plurality of first polarizer strips... and a second polarizer layer, comprising a plurality of second polarizer strips

Methodology Applied

Scientific EffectPolarization: Polarisation

Data Source

PatentUS20250072145A1Optical sensing system and light gating layer

Publication Date: 2025.02.27 PIXART IMAGING INC

AI summary

An optical sensing system comprising a first optical sensor. The first optical sensor comprises: a first pixel array; and a first light gating layer, configured to receive first input light and to provide first receiving light to the first pixel array, to make the first optical sensor has at least two different light sensitivities. The