Foldable Display Window Coating for Thinness and Impact Durability

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Solution Overview

Problem

Flexible display devices face challenges with reduced reliability due to decreased modulus and strength from thinner windows, which are prone to damage from external impacts.

Innovation Solution

A window structure comprising a base layer made of an ester-based polymer containing silicon or titanium atoms, optionally with additional inorganic layers, enhances impact resistance and strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the window is made thinner to maintain flexibility and foldability, then the flexibility and foldability are improved, but the strength and impact resistance deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoidimpact resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The window uses a composite structure combining an ester-based polymer base layer with inorganic layers (silicon oxide, silicon nitride, or titanium oxide). This composite material approach allows the window to achieve both flexibility from the polymer and enhanced strength from the inorganic components, resolving the contradiction between flexibility and impact resistance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the base layer by incorporating silicon or titanium atoms into the ester-based polymer structure. This changes the material properties to achieve higher strength and impact resistance while maintaining the flexibility needed for foldable displays

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the window thickness is reduced to enable flexible display, then the flexibility is improved, but the reliability and durability deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoiddurability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

By creating a composite structure with an ester-based polymer base layer and inorganic coating layers, the window achieves enhanced durability and reliability while maintaining the thin profile necessary for flexibility. The inorganic layers provide protective functions that improve reliability without compromising the flexible form factor

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the material parameters by incorporating silicon or titanium atoms into the polymer structure and adding inorganic layers, which improves the durability and reliability of the window while maintaining the thickness required for flexible display applications

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260050293A1Window, display device including the same, and electronic device including the same

Publication Date: 2026.02.19 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel which is foldable with respect to at least one folding axis, and a window disposed on the display panel. The window includes a base layer, and a hard coating layer disposed on the base layer, and the base layer includes an ester-based polymer and contains a silicon atom or a titanium atom.