Flexible Display Buffer-Layer Line Structure for Crack-Free Bending
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Solution Overview
Problem
Conventional flexible display devices suffer from cracks in the source electrode due to non-optimal placement on the neutral plane during bending, and are limited in high-resolution applications due to line spacing and width restrictions, with bezel minimization techniques failing to enhance aesthetic appeal.
Innovation Solution
The flexible display device incorporates a substrate with a first and second buffer layer structure, featuring a bending connection line between these layers to form a neutral plane, ensuring the line remains intact during bending, and uses a straight line configuration for high resolution, minimizing bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source electrode is placed on the neutral plane during bending, then the crack in the source electrode is reduced, but the manufacturing complexity increases due to precise positioning requirements
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the substrate and the source electrode. This buffer layer has a bending modulus specifically designed to position the neutral plane at an optimal location during bending, thereby preventing cracks in the source electrode without requiring complex precise positioning of the electrode itself.
Solution Approach 2:
The bending modulus of the buffer layer is specifically controlled to be 0.01 MPa to 10 MPa, which is significantly lower than the substrate's bending modulus. This parameter change allows the neutral plane to shift to the optimal position during bending, preventing cracks while simplifying the manufacturing process.
2Shape
If the bezel width is minimized by bending, then the aesthetic appearance is improved, but the line spacing and width restrictions limit high-resolution applications
Solution Approach 1:
The patent transitions from planar bezel design to a three-dimensional bent structure. By bending the display panel, the bezel area is redistributed from a two-dimensional width to a three-dimensional curved surface, allowing minimal visual bezel width while maintaining sufficient space for high-resolution lines in the display area.
Solution Approach 2:
Different regions of the display panel are treated differently: the bending area has optimized line configurations for high resolution, while the bezel area is minimized through bending. This local differentiation allows high-resolution display lines to be maintained while achieving aesthetic bezel minimization.
Data Source
AI summary
A flexible display device of which esthetic appearance is improved by reducing a bezel is disclosed. The flexible display device comprises a substrate including a display area and a non-display area including a bending area; a link line in the non-display area on the substrate; and a bending connection line in the bending area pf the substrate and connected with the link line, and the bending connection line located between a first buffer layer and a second buffer layer of the flexible display device.