Bendable Display Panel Stress Distribution Design
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Solution Overview
Problem
Existing flexible display apparatuses face challenges in achieving improved durability and bending characteristics, particularly in distributing stress effectively to prevent cracking when bent.
Innovation Solution
A display panel design featuring a bendable portion with a stress concentration portion and opposing stress generation portions, where the stress concentration portion has a narrower width than the stress generation portions, and the inclusion of grooves and holes to reduce stress intensity, allowing for controlled bending and enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the display panel is made flexible and bendable, then the size and weight are reduced, but the durability and bending characteristics deteriorate due to stress concentration
Solution Approach 1:
The patent applies local quality by creating a bendable portion with non-uniform width, where the width varies along the bending axis. Specifically, the bendable portion has a first width at a first position and a second width at a second position, with the ratio between these widths optimized to control stress distribution. This localized variation in geometric properties allows the structure to be more resistant to cracking at critical bending locations while maintaining overall flexibility and weight reduction benefits.
2Ease of operation
If the display panel is made flexible and bendable, then the user convenience is improved, but the bending strength deteriorates due to stress concentration
Solution Approach 1:
The patent implements local quality by designing the bendable portion with spatially varying width. The first width and second width are specifically proportioned to create optimal stress distribution during bending operations. This localized geometric optimization enhances bending strength at critical regions while preserving the overall flexibility and user convenience of the display panel.
Solution Approach 2:
The patent applies parameter changes by modifying the geometric parameters of the bendable portion, specifically the width ratios at different positions along the bending axis. By adjusting these dimensional parameters, the stress concentration during bending is reduced, thereby improving bending strength while maintaining the flexible, bendable characteristics that provide user convenience.
3Ease of manufacture
If a uniform width is used in the bendable portion, then the manufacturing is simplified, but the stress distribution becomes concentrated and causes cracking
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through a non-uniform width design in the bendable portion. The width varies along the bending axis with specific ratios between the first width and second width, which distributes stress more evenly during bending. While this requires slightly more complex manufacturing than a uniform width design, it effectively prevents stress concentration and cracking, improving overall product reliability.
Solution Approach 2:
The patent applies parameter changes by modifying the width parameter of the bendable portion along its length. Instead of maintaining a constant width, the width parameter varies spatially with optimized ratios between different sections. This parameter variation distributes stress concentration during bending, preventing cracking while maintaining reasonable manufacturing feasibility.
Data Source
AI summary
A display panel includes a first portion including a display area; a second portion adjacent to the first portion in a first direction; and a bendable portion connecting the first and second portions and at which the display panel is bent about a bending axis extending in a second direction perpendicular to the first direction. The bendable portion includes: a stress concentration portion to which a stress is applied; and first and second stress generation portions at opposing sides of the stress concentration portion in the first direction, and to which stress is applied less than that applied to the stress concentration portion. Each of the first and second stress generation portions defines a second width in the second direction, the stress concentration portion defines a third width in the second direction less than the second width, and the second width is less than the first width.