Chamfered Substrate Driving Pad for Bezel-less Display Contact Stability
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Solution Overview
Problem
Display devices face issues with image quality defects and electrical short circuits due to inadequate pad design, particularly in bezel-less configurations where the non-display area is minimized, leading to challenges in stable contact between driving pads and side wiring.
Innovation Solution
The design incorporates a substrate with chamfered surfaces and a driving pad structure featuring a flat portion and a partition wall portion with different surface heights, allowing for stable contact with side wiring and including an inspection pad for testing contact defects, which helps prevent electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is minimized to achieve bezel-less display, then the display area is maximized, but stable contact between driving pads and side wiring becomes difficult
Solution Approach 1:
The driving pad structure transitions from a conventional planar design to a three-dimensional structure with a partition wall portion extending vertically. This dimensional change allows the pad to maintain stable contact with side wiring even when the non-display area is minimized, as the vertical partition wall provides additional contact surface and mechanical stability without increasing the horizontal footprint.
Solution Approach 2:
The driving pad incorporates a partition wall portion with different properties than the flat portion. The partition wall portion has greater thickness and extends vertically to provide stable contact with side wiring, while the flat portion maintains electrical connection functionality. This local differentiation allows each region to optimize for its specific function while maintaining overall compactness.
2Ease of manufacture
If the driving pad structure is simplified for ease of manufacture, then manufacturing cost is reduced, but image quality defects and electrical short circuits increase
Solution Approach 1:
The driving pad is segmented into distinct functional regions: a flat portion for electrical connection and a partition wall portion for mechanical stability and insulation. This segmentation allows the structure to prevent electrical short circuits between adjacent wiring while maintaining manufacturing feasibility through standardized formation processes for the multi-region pad structure.
3Reliability
If the driving pad thickness is increased to improve contact stability, then contact reliability is improved, but the device complexity increases
Solution Approach 1:
The driving pad implements differential thickness design where the partition wall portion has greater thickness than the flat portion. This local quality enhancement provides improved contact stability and electrical insulation exactly where needed at the contact interface with side wiring, while the flat portion maintains appropriate thickness for electrical connection, avoiding unnecessary complexity throughout the entire pad structure.
Data Source
AI summary
A display device including a substrate having a first side surface, a first surface, a second surface opposite to the first surface, a first chamfered surface extending from an edge of the first surface to the first side surface, a second chamfered surface extending from an edge of the second surface t the first side surface, a pixel on the first surface of the substrate and including a light emitting element configured to emit light, a first driving pad at the edge of the first surface of the substrate and electrically connected to the pixel, and a side wiring on the first surface, the first chamfered surface, the first side surface, the second chamfered surface, and the second surface of the substrate. The first driving pad has a flat portion connected to the side wiring.