Electrochromic Back Cover for Dynamic Appearance Control

Solution Overview

Problem

Existing mobile device accessories, such as back covers, lack the ability to dynamically change appearance in response to user input or environmental conditions, limiting customization and aesthetic appeal.

Innovation Solution

Integration of electrochromic, thermochromic, or photochromic film stacks onto mobile device back covers, which can alter optical properties in response to electrical, thermal, or light stimuli, respectively, allowing for dynamic appearance changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional static back covers are used, then manufacturing simplicity is maintained, but appearance customization capability is limited

Engineering Contradiction:

Improveappearance customization capabilityVSAvoidback cover structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The back cover incorporates dynamic materials (electrochromic, thermochromic, or photochromic film stacks) that can actively change their optical properties in response to external stimuli such as electrical signals, temperature changes, or light exposure. This transforms the static back cover into a dynamic component capable of appearance customization while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the optical parameters (transparency, color, opacity) of the back cover by integrating special film stacks that respond to external conditions. These film stacks alter their physical properties based on environmental factors or user control, enabling appearance customization without complex mechanical or electronic systems.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If electrochromic or thermochromic film stacks are integrated, then appearance adaptability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvedynamic appearance change capabilityVSAvoidback cover manufacturing complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention uses thin film stacks (electrochromic, thermochromic, or photochromic) that can be applied to the back cover surface. These flexible films integrate seamlessly with the existing back cover structure, allowing dynamic appearance changes while maintaining ease of manufacturing through simple lamination or coating processes rather than complex assembly steps.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If multiple film stacks are used for different color options, then appearance versatility is enhanced, but device complexity increases

Engineering Contradiction:

Improvecolor variety and appearance optionsVSAvoidfilm stack layer structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The back cover can incorporate different types of film stacks (electrochromic, thermochromic, photochromic) in different regions or use a single multi-functional film that responds to various stimuli. This allows for color variety and appearance options while maintaining a relatively simple single-layer or multi-region structure rather than requiring multiple separate film stacks throughout.

Inventive Principle:

Principle #3Local quality

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

Enables user-controlled or environment-driven changes in the appearance of mobile device back covers, enhancing customization and aesthetic versatility without compromising functionality.

Implementation Method 1

Integration of electrochromic, thermochromic, or photochromic film stacks onto mobile device back covers, which can alter optical properties in response to electrical, thermal, or light stimuli, respectively

Methodology Applied

Scientific EffectElectrochromism: Electrochromism

Implementation Method 2

Integration of electrochromic, thermochromic, or photochromic film stacks onto mobile device back covers, which can alter optical properties in response to electrical, thermal, or light stimuli, respectively

Methodology Applied

Scientific EffectThermochromism: Thermochromism

Implementation Method 3

Integration of electrochromic, thermochromic, or photochromic film stacks onto mobile device back covers, which can alter optical properties in response to electrical, thermal, or light stimuli, respectively

Methodology Applied

Scientific EffectPhotochromism: Photochromism

Data Source

PatentEP4286934B1Back cover for mobile devices with adjustable appearance

Publication Date: 2026.03.18 FURCIFER INC

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AI summary

A back cover for a mobile device, the back cover comprising an electrochromic film device attached to a back of the mobile device, wherein the electrochromic film device includes: an electrochromic layer; a charge storage layer comprising a metal oxide; and a suspension encapsulated between two films, the suspension comprising a mixture having a crystalline phase below a transition temperature of the mixture and an isotropic liquid phase above the transition temperature, the mixture being adjusted in tint in response to a temperature increasing to above the transition temperature