Flexible Display Bending Structure for Wire Crack Prevention
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Solution Overview
Problem
Bending a display device with stacked function layers causes cracks due to stress, potentially breaking wires.
Innovation Solution
A display device design with a resin layer having holes or dents and an insulating layer with openings to overlap wires, reducing stress and preventing cracks during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is bent to achieve flexibility, then the flexible display function is improved, but cracks occur in the function layers and wires may break
Solution Approach 1:
The patent divides the bending portion into multiple segments by forming holes through the resin layer and openings through the insulating layer along the wire path. These segmented structures allow controlled stress distribution during bending, preventing crack propagation while maintaining wire integrity. The holes and openings act as discrete stress relief points that segment the continuous stress field.
Solution Approach 2:
The patent applies local quality by creating holes and openings specifically in the bending portion where stress concentrates during flexing, while leaving other regions intact. This localized modification provides stress relief exactly where needed without compromising the structural integrity or electrical functionality of the rest of the device.
2Reliability
If holes and openings are added to reduce stress during bending, then wire integrity is improved, but device complexity increases
Solution Approach 1:
The patent implements nesting by placing openings within the insulating layer that align with and contain the holes in the resin layer below. This nested arrangement allows multiple stress-relief functions to be integrated in a compact vertical stack, reducing horizontal space requirements and minimizing the increase in device complexity while maintaining wire protection.
Data Source
AI summary
A display device of the present disclosure has a display region including a thin-film transistor, a terminal section, and a bending portion provided between the display region and the terminal section, and the display device includes the following: a resin layer provided above a base in the bending portion; an insulating layer provided to cover the resin layer; and a first wire provided above the insulating layer and extending in a first direction to electrically connect the thin-film transistor and the terminal section together, the first direction being a direction where the display region and the terminal section are disposed, wherein in the bending portion, the resin layer has at least one hole or dent overlapping the first wire in a plan view, and the insulating layer has at least one opening overlapping the at least one hole or dent in a plan view.