Display Pad-Conductor Overlap Layout for Reliable Edge Connection
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Solution Overview
Problem
Existing display apparatuses face challenges in efficiently connecting conductive lines to pads in non-display areas without compromising the structural integrity and electrical performance of the display area.
Innovation Solution
A display apparatus design featuring a conductor that overlaps with a pad and is interposed between a conductive line and the pad, with an isolated shape, and includes multiple pad layers for enhanced connectivity and protection, while maintaining alignment with the substrate edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductor is placed between a conductive line and a pad to ensure electrical connection, then electrical connectivity is improved, but the risk of structural damage increases due to stress concentration at sharp corners
Solution Approach 1:
The patent applies beforehand cushioning by adding a pad structure with rounded corners that surrounds the conductor. This pad acts as a cushioning element that distributes stress and prevents stress concentration at sharp corners of the conductor, thereby preventing structural damage while maintaining electrical connectivity. The rounded corners of the pad specifically address the stress concentration issue before it can cause damage.
2Ease of manufacture
If the conductor has a simple shape to ease manufacturing, then ease of manufacture is improved, but electrical connection reliability deteriorates due to insufficient contact area
Solution Approach 1:
The patent applies another dimension by transitioning from a simple linear conductor to a two-dimensional pad structure with rounded corners that surrounds the conductor. This dimensional expansion increases the contact area between the conductive line and the pad, improving electrical connection reliability while maintaining manufacturing simplicity through the use of standard photolithography patterns.
3Strength
If the conductor corners are rounded to prevent stress concentration, then structural integrity is improved, but manufacturing precision requirements worsen due to complex patterning
Solution Approach 1:
The patent applies intermediary by introducing the pad as a mediating structure between the conductor and the substrate. The pad with its rounded corners serves as an intermediary element that provides stress distribution benefits without requiring direct precision rounding of the conductor itself. The conductor can maintain simpler geometry while the pad handles the stress distribution function.
Data Source
AI summary
A display apparatus includes: a substrate; a plurality of sub-pixel circuits on the substrate, each of the plurality of sub-pixel circuits including at least one transistor; a plurality of light-emitting diodes electrically connected to the plurality of sub-pixel circuits, respectively, and defining a display area; a pad at a non-display area outside the display area; a conductive line extending toward a first edge of the substrate; and a conductor electrically connecting the conductive line to the pad. The conductor overlaps with the pad, is interposed between a part of the conductive line and a part of the pad, and has an isolated shape in a plan view.