Display Panel Side-Surface Wiring for Stress-Resistant Pad Connection
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Solution Overview
Problem
Display panels are prone to defects on their side surfaces due to stress during manufacturing, which can lead to loss or deformation of connection lines.
Innovation Solution
A display device design featuring a substrate with upper and lower surfaces connected by a side surface, including a light-emitting element on the upper surface, upper and lower conductive lines with grooves, and a side surface connection line that electrically connects exposed pad electrodes, with insulating layers overlapping these grooves to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple process steps are used in manufacturing, then the display device can be produced with required functionality, but stress is applied to the side surface causing connection line loss or deformation
Solution Approach 1:
The connection line is pre-formed on the side surface of the substrate before completing the manufacturing process. This preliminary formation allows the connection line to be in place and protected before stress-prone manufacturing steps occur, preventing loss or deformation during subsequent processing
Solution Approach 2:
The connection line is positioned on the side surface of the substrate, transitioning from a planar two-dimensional arrangement to a three-dimensional configuration. This spatial relocation allows the connection line to bypass stress concentration areas on the top and bottom surfaces while maintaining electrical connectivity
2Reliability
If the side surface connection line is used to connect pad electrodes, then electrical connectivity is achieved, but the connection line is vulnerable to stress during manufacturing
Solution Approach 1:
The connection line on the side surface is formed with locally optimized properties, including specific material composition and cross-sectional shape, to enhance its resistance to manufacturing stress while maintaining electrical connectivity function
Solution Approach 2:
The connection line is formed and positioned on the side surface before stress-prone manufacturing steps, creating a protective configuration that cushions against subsequent stress application and prevents deformation or loss
Data Source
AI summary
Provided is a display including a substrate, a light emitting element disposed on an upper surface of the substrate in a display area, an upper conductive line disposed on the upper surface of the substrate in a non-display area around the display area and having first openings, an upper pad electrode disposed on the upper conductive line, a first insulating layer disposed on the upper pad electrode and exposing a portion of the upper pad electrode, a lower conductive line disposed on a lower surface of the substrate in the non-display area, and a side surface connection line disposed on a side surface of the substrate, electrically connecting the exposed portion of the upper pad electrode to the lower conductive line, and overlapping the first openings. The upper pad electrode has first grooves overlapping the first openings in a thickness direction.