Laser Cutting Flexible Substrates Using Protective Layer Ablation
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Solution Overview
Problem
The cutting process for substrates, especially those made of flexible materials, is challenging due to difficulties in controlling the cutting process, which limits the improvement of desired characteristics and efficiency in manufacturing display apparatuses.
Innovation Solution
A method involving the formation of protective layers on substrates, where a first protective layer is irradiated with a defocused laser beam to create a removal area, and a second laser beam is used to cut the substrate, minimizing damage and allowing for precise cutting by controlling the focus and width of the laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cutting process is used on flexible substrates, then the substrate can be cut, but the cutting process cannot be controlled precisely and causes heat damage
Solution Approach 1:
A protective layer is introduced as an intermediary between the laser beam and the flexible substrate. This protective layer absorbs the laser energy and undergoes ablation, preventing direct heat transfer to the substrate while enabling precise cutting through the material removal process
Solution Approach 2:
The conventional mechanical or thermal cutting process is replaced with a laser-based ablation process. The laser beam, focused through the protective layer, directly ablates the protective layer material without significantly heating the substrate, achieving precise cutting with minimal thermal damage
2Productivity
If laser beam is focused directly on the substrate, then cutting can be performed, but heat damage and surface damage occur
Solution Approach 1:
The protective layer serves as a mediator that the laser beam interacts with first. By focusing the laser on the protective layer rather than the substrate, the system achieves efficient material removal while the protective layer shields the substrate from direct laser-induced surface damage
Solution Approach 2:
The protective layer is applied to the substrate before the cutting process begins. This preliminary action prepares the substrate by providing a sacrificial layer that will absorb the laser energy and protect the underlying substrate during the subsequent cutting operation
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
This method reduces heat and surface damage to the substrate, enabling precise cutting while improving the efficiency and characteristics of the display apparatus manufacturing process.
Implementation Method 1
forming a removal area where a portion of the first protective layer is removed by irradiating the first protective layer at the portion of the first protective layer with a first laser beam
Implementation Method 2
forming a cutting area by removing a portion of the substrate by irradiating the substrate with a second laser beam at the removal area
Data Source
AI summary
A method of cutting a substrate includes: forming a first protective layer on a first surface of the substrate; forming a removal area where a portion of the first protective layer is removed by irradiating the first protective layer at the portion of the first protective layer with a first laser beam; and forming a cutting area by removing a portion of the substrate by irradiating the substrate with a second laser beam at the removal area, after irradiating the first protective layer with the first laser beam.