Flexible Display Substrate with Bending Area Openings
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Solution Overview
Problem
Existing display devices face challenges in bending without limitations, particularly due to substrate type constraints, which restricts the flexibility and efficiency of spatial use, especially in non-display areas.
Innovation Solution
A display device design featuring a substrate with openings in the bending area, covered by organic and inorganic material layers, and a wiring layer that extends across the bending area, allowing for flexible bending without substrate type limitations, and minimizing non-display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substrate with openings in the bending area is used, then flexibility and spatial utilization are improved, but manufacturing complexity increases
Solution Approach 1:
The substrate is divided into multiple regions: a first area, a second area, and a bending area connecting them. The bending area contains openings that segment the substrate structure, allowing independent movement and bending of the first and second areas while maintaining overall structural integrity. This segmentation enables flexible bending without compromising the strength of the display device.
Solution Approach 2:
The bending area of the substrate is designed with openings, creating a porous or mesh-like structure in that specific region. This porous configuration reduces material density in the bending area, allowing the substrate to flex more easily without breaking, while the solid portions of the substrate maintain structural support. The openings effectively reduce the moment of inertia in the bending region, enhancing flexibility.
2Area of stationary object
If the wiring layer extends across the bending area, then spatial utilization is improved, but wiring integrity during bending becomes challenging
Solution Approach 1:
The wiring layer is designed to dynamically adapt to the bending deformation. The wiring pattern includes sections that can flex and deform elastically in the bending area, with appropriate routing that avoids high-stress zones. The wiring layer is configured to follow the curvature of the bent substrate, maintaining electrical connectivity while accommodating the mechanical deformation through flexible trace routing and appropriate wire placement.
Solution Approach 2:
The wiring layer incorporates redundant pathways and flexible connection designs that anticipate bending stresses. By pre-configuring the wiring with sufficient flexibility margins and alternative routing paths, the design cushions against potential wiring failure during bending operations, ensuring reliability even under repeated flexing conditions.
3Productivity
If non-display areas are minimized, then device efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different regions of the substrate are assigned different functional qualities: the first area and second area are optimized for display functionality with high pixel density, while the bending area is optimized for mechanical flexibility with openings and reduced material. This local differentiation allows each region to be manufactured with appropriate precision levels for its specific function, minimizing non-display areas without requiring uniform high precision across the entire device.
Data Source
AI summary
A display device includes: a bending area between a first area and a second area; a substrate having a first opening, at least a portion of the first opening corresponding to the bending area; a display layer on a first surface of the substrate in the first area; an encapsulation member on the display layer; a first organic material layer on the substrate to cover the first opening of the substrate; and a wiring layer on the first organic material layer and comprising a plurality of wires extending in a direction crossing the bending area.