Flexible Display Panel Fan-Out Lead Alignment
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Solution Overview
Problem
Flexible display panels face misalignment and broken circuits during the COF bonding process due to size changes, affecting yield and reliability, as the dense pads on the COF are sensitive to size variations in the flexible display panel.
Innovation Solution
The flexible display panel is designed with fan-out leads and pads arranged in a fan-out region, divided into central and lateral regions, with virtual extension lines intersecting at specific junction points on a reference line, allowing for adjustable alignment and compression joint connections to maintain alignment despite size changes, ensuring correct bonding and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the flexible display panel is made thin for flexibility, then the flexibility and portability are improved, but the size change due to force during backing film attachment causes misalignment and broken circuits in the COF bonding process
Solution Approach 1:
The patent applies the dynamics principle by designing the fan-out leads with different orientations in lateral regions, allowing them to accommodate size changes through their geometric configuration. The virtual extension lines intersecting at junction points create a dynamic geometric relationship that maintains alignment despite panel deformation
Solution Approach 2:
The patent changes the geometric parameters of the fan-out leads by varying their orientations in different lateral regions. This parameter change allows the leads to adapt to size variations while maintaining proper alignment with the COF pads through the intersecting virtual extension lines configuration
2Productivity
If the pads on the COF are arranged densely to increase connection density, then the integration is improved, but the sensitivity to size change increases causing misalignment and broken circuits
Solution Approach 1:
The patent applies local quality by giving different orientations to fan-out leads in different lateral regions. This local differentiation allows each region to optimally handle alignment requirements for densely packed pads while maintaining overall system reliability through the geometric configuration of intersecting virtual extension lines
Data Source
AI summary
A flexible display panel, a display device and a bonding method thereof are provided. The flexible display panel includes a plurality of fan-out leads arranged along a first direction and disposed in a fan-out region; virtual extension lines of the fan out leads at least disposed in lateral regions of the fan-out region are intersected at a first junction point on a reference line perpendicular to the first direction; a chip on film includes a plurality of pads being arranged along the first direction and in one-to-one correspondence with the fan-out leads; and virtual extension lines of the pads, which at least correspond to the fan-out leads disposed in the lateral regions, are intersected at a second junction point on the reference line.