Flexible Display Wiring Isolation via Stepped Insulating Layer Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible displays face issues with short circuits between wirings due to conductive film remnants in stepped portions, which existing technologies fail to adequately address.
Innovation Solution
The design incorporates a flexible substrate with a stepped portion structure featuring projecting portions and recessed corners between wirings, ensuring that any remaining conductive film is isolated and preventing electrical connection between adjacent wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the insulating layer is removed from the bending target region to make the flexible display easy to bend, then the flexibility is improved, but the conductive film is likely to remain between adjacent wirings, causing short circuit
Solution Approach 1:
The insulating layer is segmented: it is removed from the bending target region to provide flexibility, while retaining in the wiring region to prevent short circuits. This spatial segmentation allows the system to simultaneously achieve both flexibility and electrical isolation between adjacent wirings
Solution Approach 2:
The insulating layer is selectively present or absent in different regions: absent in the bending region for flexibility, and present in the wiring region for electrical isolation. This local quality variation optimizes both mechanical and electrical properties in their respective zones
2Manufacturing precision
If the insulating layer is partially removed to form a step, then the wiring structure is improved, but the etching of the conductive film is performed when forming the wiring on the insulating layer, and the conductive film is likely to remain between adjacent wirings
Solution Approach 1:
The insulating layer is extracted (removed) from the bending target region while being retained in the wiring region. This selective extraction prevents conductive film residue between adjacent wirings by maintaining the insulating barrier where wiring formation occurs, while still enabling flexibility where the insulating layer is removed
Data Source
AI summary
A lower base surface of wirings includes a stepped portion with upper surfaces having mutually different heights and stepped surfaces rising from respective upper surfaces. Each upper surface and the stepped surface form a projecting portion rising in each normal direction and constitute a first recessed corner portion immediately below the wirings and a second recessed corner portion at the tip of the projecting portion in the normal direction of the stepped surface. A first interval exists between the adjacent wirings. The first recessed corner portion has a first height. The second recessed corner portion has a second height and a second width in the first direction. The second width is smaller than the first interval, the second height is lower than the first height, or both the second width is smaller than the first interval and the second height is lower than the first height.