Flexible Display Cover Layers With Self-Healing Scratch Repair

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Solution Overview

Problem

Rigid displays are difficult to integrate into devices with bendable housings, and scratches or dents on display cover layers can compromise the aesthetics and functionality of electronic devices.

Innovation Solution

Incorporating a flexible display cover layer with a self-healing material and a transparent dielectric layer, optionally with slits filled with index-matching material, to allow bending without damage and minimize imperfections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a rigid display cover layer is used, then structural strength and protection are improved, but flexibility and ability to bend without damage deteriorate

Engineering Contradiction:

Improvestructural strengthVSAvoidflexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The display cover layer is divided into multiple segments: rigid portions for structural strength and a flexible portion for bending capability. The flexible portion includes a self-healing material layer that can autonomously repair scratches and dents, allowing the display to maintain both protection and flexibility without requiring external intervention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display cover layer uses composite materials combining rigid substrates with flexible self-healing polymer layers. This composite structure provides both the structural integrity needed for protection and the flexibility required for bending, while the self-healing properties maintain aesthetic appearance during flexing operations.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the display cover layer is made flexible to enable bending, then adaptability to bendable housings is improved, but susceptibility to scratches and dents increases

Engineering Contradiction:

ImproveflexibilityVSAvoidscratches and dents

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The display cover layer incorporates a self-healing material that autonomously repairs scratches and dents without external intervention. When damage occurs during bending or use, the self-healing polymer automatically restores the surface appearance, eliminating the need for user intervention or external repair mechanisms.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The self-healing material changes its physical or chemical parameters in response to damage stimuli, such as temperature or mechanical stress, to restore the surface. This dynamic parameter change enables the material to transition from a damaged state to a healed state, maintaining aesthetic appearance during flexible operations.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a self-healing material layer is added to the display cover layer, then resistance to scratches and dents is improved, but device complexity increases

Engineering Contradiction:

Improveresistance to damageVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The self-healing material is implemented as a thin flexible film or coating layer applied over the rigid display cover layer. This thin-film approach provides damage resistance and self-healing capabilities without adding significant bulk or complexity to the overall device structure, maintaining a sleek and compact design.

Inventive Principle:

Principle #30Flexible shells and thin films

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 flexible display cover layer with self-healing properties maintains aesthetic integrity and mechanical performance by automatically repairing scratches and dents, enhancing the durability and flexibility of the display.

Implementation Method 1

the display cover layer may include a layer of self-healing material

Methodology Applied

Scientific EffectSelf-healing:

Implementation Method 2

the display cover layer may include transparent conductors that form a heating layer in the display cover layer. The heating layer may be used to generate heat to stimulate self-healing

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

The display cover layer may include a layer of elastomer in the flexible region of the display cover layer for increased flexibility

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 4

The slits may be filled with an index-matching material

Methodology Applied

Scientific EffectIndex matching:

Data Source

PatentUS12429907B2Electronic devices with flexible display cover layers

Publication Date: 2025.09.30 APPLE INC

AI summary

An electronic device may have a hinge that allows the device to be flexed about a bend axis. A display may span the bend axis. To facilitate bending about the bend axis without damage, the display may include a display cover layer with a flexible portion. The flexible portion of the display cover layer may be interposed between first and second rigid portions of the display cover layer. The display cover layer may also include a layer with self-healing properties. The layer of self-healing material may be formed across the entire display cover layer or may be formed only in the flexible region of the display cover layer. The display cover layer may include a layer of elastomer in the flexible region of the display cover layer for increased flexibility. Self-healing may be initiated or expedited by externally applied heat, light, electric current, or other type of external stimulus.