Electrochromic Aperture With Index-Matched Core for Low Phase Distortion

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Solution Overview

Problem

Conventional imaging systems in portable electronic devices often have fixed apertures that are not optimally sized for all scenes, leading to suboptimal image capture due to phase distortion and inconsistent light transmission.

Innovation Solution

A switchable aperture system with an electrochromic stack that includes a non-switching region and a switching region, where the non-switching region maintains transparency and has the same index of refraction as the switching region, minimizing phase distortion by using a dielectric backfill material to ensure consistent optical path length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a fixed aperture is used to minimize device profile, then device compactness is improved, but adaptability for different scenes deteriorates

Engineering Contradiction:

Improvedevice profileVSAvoidaperture sizing for different scenes

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent implements a switchable aperture that can dynamically change its opening size between different states (e.g., first state with larger opening, second state with smaller opening). This allows the imaging system to adapt to different scene requirements while maintaining a compact device profile, resolving the contradiction between fixed compactness and scene adaptability.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If a switchable aperture is implemented, then adaptability for different scenes is improved, but phase distortion and inconsistent light transmission worsen

Engineering Contradiction:

Improveaperture sizing controlVSAvoidoptical path consistency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent divides the aperture structure into different regions with different properties: a first region that is conductively decoupled and maintains consistent optical properties, and a second region that is switchable. This local differentiation allows the switchable region to provide adaptability while the consistent-index region maintains optical path reliability, resolving the contradiction between adaptability and optical consistency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses materials with matched indices of refraction (e.g., dielectric backfill material with index matching the transparent conductive layer) to create homogeneous optical paths. This ensures that light transmission remains consistent across different aperture states, preventing phase distortion while maintaining switchable adaptability.

Inventive Principle:

Principle #33Homogeneity

3Adaptability or versatility

If aperture size is changed for different scenes, then image capture flexibility is improved, but phase distortion increases

Engineering Contradiction:

Improvelight transmission controlVSAvoidphase distortion

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a dielectric backfill material as an intermediary substance to fill etched cavities in the transparent conductive layer. This intermediary material has an index of refraction that matches the surrounding transparent conductive material, creating a seamless optical path that eliminates phase distortion at interfaces while still allowing aperture size to be changed for different imaging scenarios.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The system provides controlled light transmission and reduced phase distortion, enabling improved image quality and flexibility in image brightness and depth of field control.

Implementation Method 1

the controller is configured to apply a voltage across the first electrode and the second electrode which causes the transparent optoelectric layer to change opacity over the first region

Methodology Applied

Scientific EffectElectrochromism: Electrochromism

Implementation Method 2

the non-switching region maintains transparency and has the same index of refraction as the switching region, minimizing phase distortion by using a dielectric backfill material to ensure consistent optical path length

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12591162B2Controllable aperture with index-matched central region for a portable electronic device imaging system

Publication Date: 2026.03.31 APPLE INC

AI summary

An imaging system for a portable electronic device includes a variable aperture between a lens group and an image sensor. The variable aperture is defined by an electrochromic stack that defines a switching region and a central non-switching region. The non-switching region can be etched through the same material or set of materials defining the switching region and is backfilled with a dielectric transparent material having an index of refraction substantially equal to an average index of refraction of the layer(s) of the switching region of the electrochromic stack. This construction substantially reduces visible light absorption of the variable aperture.