Arc Pad Arrangement for Display Panel Alignment
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Solution Overview
Problem
Conventional display apparatuses, such as OLEDs, face challenges in securely and simply connecting pads on a display panel to a circuit board, requiring a secure space and efficient alignment for effective electrical coupling.
Innovation Solution
The design includes a display panel with pads arranged along an arc direction on a non-display region, matched by terminals on a flexible circuit board, allowing for easy and secure electrical coupling while optimizing space usage, with features like varying angles and arc lengths between pads and terminals to ensure alignment and reduce misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pads are arranged in a conventional linear or grid pattern on the display panel, then the connection structure is simple, but the connection space is insufficient and alignment precision deteriorates
Solution Approach 1:
The patent applies curvature by arranging pads along an arc rather than a straight line. The arc-shaped pad arrangement matches the curved display panel geometry, improving alignment precision while maintaining connection simplicity. The flexible circuit board follows this curved path, eliminating misalignment issues inherent in linear arrangements on curved surfaces.
Solution Approach 2:
The patent transitions from conventional two-dimensional linear or grid pad arrangements to a distributed spatial arrangement along an arc. By utilizing the arc direction (first direction) and radial direction (second direction), the pads are positioned at at least two different locations along the arc, effectively using three-dimensional spatial relationships to improve alignment and reduce misalignment.
2Reliability
If more space is allocated for pad connections, then connection reliability improves, but the display panel area is reduced
Solution Approach 1:
The arc-shaped pad arrangement utilizes the curved geometry of the display panel to pack connections more efficiently. By following the arc curvature, multiple pads can be arranged along a compact path that maintains adequate connection spacing and reliability while occupying minimal display panel area compared to linear arrangements.
Solution Approach 2:
The connection path is segmented into multiple discrete pad locations along the arc, with each pad positioned at specific angular intervals. This segmentation allows for optimized spacing between connections while maintaining overall compactness, improving reliability without sacrificing display area.
3Ease of manufacture
If pads are positioned at the same location along the first direction, then alignment is simplified, but misalignment occurs on curved panels
Solution Approach 1:
The patent explicitly addresses curved panel geometry by positioning pads at different locations along the arc. This curvature-aware arrangement ensures that pads and corresponding terminals maintain proper alignment throughout the curved surface, preventing misalignment that would occur with conventional flat-panel linear arrangements.
Solution Approach 2:
The pad arrangement incorporates local variations in positioning along the arc to account for the curved panel geometry. Each pad is positioned at a specific location along the first direction (arc direction), with the local curvature characteristics considered in the positioning, ensuring optimal alignment and connection precision at each location.
Data Source
AI summary
Provided is a display apparatus. The display apparatus includes a display panel including a substrate including a display region in which a display unit is located, a non-display region that extends outward from the display region and in which a plurality of pads are located, and a sealing portion that covers the display unit. The display apparatus also includes a circuit board including a flexible film and a plurality of terminals on the flexible film that are electrically coupled to the plurality of pads. The plurality of pads are spaced from each other along a first direction of the display panel and pad central points of the plurality of pads are located at at least two different locations along the first direction.