Flexible Display Connection Line Layout for Bent Edge Signal Integrity
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Solution Overview
Problem
Display devices with flexible substrates face issues with signal lines in the non-display region becoming stretched and bent, leading to increased resistance, current density, and power consumption, which deteriorate display quality.
Innovation Solution
The display device incorporates a substrate with a display area and a peripheral area, featuring a bending region and a contact region. A connection line with a dual-layer structure, including a first layer and a second layer, is used in the bending region to maintain electrical connectivity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel is bent at the periphery to reduce the perceivable size of the non-display region, then the displayed image appears closer to the edges, but the signal lines in the non-display region become stretched, increasing resistance and power consumption
Solution Approach 1:
The connection line transitions from a planar structure to a three-dimensional folded structure. The line includes first and second folded portions that bend in opposite directions, creating a spatial configuration that accommodates panel bending while maintaining electrical connection. This dimensional transformation allows the line to follow the panel's curvature without excessive stretching.
Solution Approach 2:
The connection line is divided into multiple segments: a first folded portion, a second folded portion, and intermediate portions. Each segment can independently deform during panel bending, distributing the mechanical stress and preventing excessive stretching of any single section. This segmentation enables the line to maintain electrical connectivity while adapting to the bent panel geometry.
2Area of stationary object
If the display panel is bent at the periphery, then the displayed image appears closer to the edges, but the cross-sectional area of signal lines is reduced, increasing current density
Solution Approach 1:
By transforming the connection line into a three-dimensional folded structure with multiple bent portions, the effective path length is increased without proportionally increasing the stretched cross-sectional area. The folded configuration allows the line to maintain adequate cross-sectional dimensions even when the panel is bent, preventing excessive current density.
Solution Approach 2:
The connection line is designed with folded portions that can dynamically adjust their configuration during panel bending. The first and second folded portions bend in opposite directions, creating a flexible structure that maintains electrical connectivity while adapting to mechanical deformation, thereby preserving reliable current flow.
3Device complexity
If a single-layer connection line is used in the bending region, then the structure is simpler, but the resistance increases and signal integrity deteriorates when bent
Solution Approach 1:
The connection line employs a composite structure with multiple layers (first and second folded portions) that work together to maintain electrical connectivity. This multi-layer configuration provides redundant conduction paths and distributes electrical current, ensuring signal integrity even when individual layers experience stress during bending.
Solution Approach 2:
The connection line is segmented into multiple folded portions that can independently deform during bending. This segmentation allows each segment to accommodate local stress while maintaining overall electrical connectivity, preserving signal integrity without requiring excessive structural complexity.
Data Source
AI summary
A display device includes a substrate including a display area and a peripheral area disposed around the display area. The peripheral area includes a bending region and a contact region adjacent to the bending region. A first connection line includes a first portion disposed in the contact region, and a second portion disposed in both the bending region and the contact region, and including a first layer and a second layer. At least part of the second layer of the second portion overlaps the first layer of the second portion. In the contact region, the first layer of the second portion is electrically connected to the first portion, and the second layer of the second portion is electrically connected to the first layer of the second portion.