Rollable Cover Window Shock Compensation Pattern

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Solution Overview

Problem

Conventional rollable, slidable, and stretchable cover windows for flexible displays suffer from in-plane microscopic crack propagation, stress dispersion issues, and low shock resistance due to inherent defects and physical defects in the glass substrate, leading to poor folding properties and high failure rates.

Innovation Solution

A rollable, slidable, and stretchable cover window with a shock compensation pattern unit formed on a glass substrate, featuring concave-convex-shaped patterns to disperse stress and shock, improving strength and folding properties by preventing in-plane crack propagation and enhancing pen-drop resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a glass substrate is used for the cover window, then strength and shock resistance are improved, but folding properties deteriorate due to in-plane crack propagation

Engineering Contradiction:

ImprovestrengthVSAvoidfolding properties

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The glass substrate is segmented into multiple regions by forming a shock compensation pattern unit with a specific structure comprising a first pattern and a second pattern. This segmentation prevents in-plane crack propagation by dividing the stress distribution paths, thereby maintaining folding properties while preserving strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shock compensation pattern unit introduces local structural variations into the glass substrate. The first pattern and second pattern create localized stress distribution characteristics that differ from the bulk glass, enabling the cover window to accommodate folding stresses without catastrophic failure while maintaining overall strength.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the glass substrate has inherent defects, then manufacturing is simplified, but reliability deteriorates due to crack propagation from defects

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidfailure rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The shock compensation pattern unit converts the potentially harmful effect of inherent defects into a beneficial stress distribution mechanism. The first and second patterns work together to redirect stress away from defect locations, preventing crack initiation and propagation while maintaining manufacturing simplicity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If conventional folding tests are performed only on the central axis, then testing complexity is reduced, but measurement precision deteriorates due to insufficient coverage of flexible regions

Engineering Contradiction:

Improvetesting complexityVSAvoidfolding property evaluation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The evaluation method transitions from one-dimensional central axis testing to two-dimensional comprehensive testing by measuring both the central axis folding properties and the flexible region folding properties. This dimensional expansion ensures complete coverage of the cover window's folding behavior without excessive complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11647644B2Rollable, slidable, and stretchable cover window and method of manufacturing the same

Publication Date: 2023.05.09 UTI INC

AI summary

Disclosed are a rollable, slidable, and stretchable cover window and a method of manufacturing the same. The rollable, slidable, and stretchable cover window includes a planar portion formed so as to correspond to a planar region of a rollable, slidable, and stretchable display and a flexible portion formed so as to be connected to the planar portion, the flexible portion being formed so as to correspond to a flexible region of the rollable, slidable, and stretchable display, wherein the rollable, slidable, and stretchable cover window includes a glass substrate and a shock compensation pattern unit formed on the glass substrate, and the shock compensation pattern unit is formed at the flexible portion or is formed at each of the planar portion and the flexible portion, the shock compensation pattern unit having concave-convex-shaped patterns.