Flexible Display Panel Terminal Geometry for Clean Laser-Cut Contacts
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Solution Overview
Problem
Existing laser cutting methods for flexible display panels leave carbide residues on the cut end surfaces, which can affect the electrical connectivity and integrity of the terminal portions.
Innovation Solution
A flexible display panel design with an inclined surface on the terminal portion, formed by laser cutting with a specific width and angle, followed by dry cleaning to remove carbide residues using dry ice snow, ensuring the inclined surface has a width of at least 13.1 μm and an angle less than 86 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser cutting is performed on the terminal portion, then the cut end surface is formed, but carbide residues remain on the cut end surface
Solution Approach 1:
An inclined surface is formed in advance on the terminal portion before laser cutting. This preliminary structural preparation ensures that when laser cutting occurs, the carbide residues generated during cutting do not adhere to the inclined surface due to its geometric characteristics, thereby preventing contamination of the cut end surface
Solution Approach 2:
The terminal portion is designed with an asymmetric inclined surface rather than a flat symmetric surface. This asymmetric geometry creates a surface that does not favor carbide adhesion, as the angled structure prevents carbide particles from settling and adhering effectively during the laser cutting process
2Reliability
If the inclined surface width is increased to prevent carbide adhesion, then carbide removal effectiveness improves, but the terminal portion area increases
Solution Approach 1:
The width of the inclined surface is optimized to a specific parameter range (10 μm to 50 μm). This parameter optimization ensures sufficient space for carbide removal while controlling the overall terminal portion area, achieving a balance between electrical connection reliability and space efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents carbide residues from adhering to the cut end surfaces, maintaining high electrical resistance and reducing dirt adhesion, thereby ensuring reliable electrical connections and improved panel integrity.
Implementation Method 1
A laser apparatus (laser processing apparatus) is used to process a terminal portion or other components of the flexible display panel during manufacturing
Implementation Method 2
cleaning, by dry cleaning, an inclined surface formed in the cutting
Data Source
AI summary
Provided is a substrate including a flexible substrate including a first main surface and a second main surface on an opposite side of the first main surface, and a wiring layer on the first main surface of the flexible substrate. The flexible substrate includes a terminal portion. The terminal portion includes an inclined surface inclined from a side of the second main surface to a side of the first main surface, and a width of the inclined surface in plan view of the substrate is equal to or greater than 13.1 μm and equal to or smaller than 167 μm.