Laser Cutting Intervals for Smooth Display Panel Substrate Edges
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Solution Overview
Problem
Conventional laser cutting methods for display panel mother substrates often result in uneven surfaces, particularly at the edges, due to inconsistent energy distribution and interval spacing, leading to incomplete separation and rough cuts.
Innovation Solution
A cutting method that alternates laser irradiation intervals and energy output along specific cutting lines, with first intervals constant and second intervals gradually decreasing, and varying energy application between dummy and edge areas, using pulse or femtosecond lasers to improve surface smoothness and separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser is irradiated at constant intervals along the cutting line, then the cutting process is simple and fast, but the surface smoothness deteriorates due to inconsistent energy distribution in different areas
Solution Approach 1:
The patent applies local quality by using different laser irradiation intervals for different areas of the mother substrate. Specifically, the first interval is used for dummy areas while the second interval is used for edge areas, allowing each region to receive optimized energy distribution tailored to its specific cutting requirements, thereby achieving smooth surfaces throughout.
Solution Approach 2:
The patent implements dynamics by making the laser irradiation interval variable rather than constant. The system dynamically adjusts the interval between laser irradiations based on the location (dummy area vs. edge area), enabling adaptive energy distribution that responds to the varying thermal and structural conditions across different regions of the substrate.
2Productivity
If laser output energy is increased to improve cutting efficiency, then productivity increases, but thermal effects increase causing rougher cuts and incomplete separation
Solution Approach 1:
The patent applies periodic action by using pulsed laser irradiation with specific intervals between pulses. This periodic delivery of energy allows heat to dissipate between pulses, preventing excessive thermal accumulation that would cause rough cuts and incomplete separation, while still maintaining cutting efficiency through optimized pulse frequency and duration.
Solution Approach 2:
The patent implements parameter changes by varying the laser output energy and irradiation intervals based on the cutting area. By adjusting these parameters dynamically - using the first interval for dummy areas and the second interval for edge areas - the system optimizes the balance between cutting efficiency and thermal effect control for each specific region.
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 ensures smooth cutting of display panel mother substrates by reducing thermal effects and maintaining consistent energy distribution, resulting in precise and efficient separation of display panel units from the mother substrate.
Implementation Method 1
irradiating a laser to the mother substrate at first intervals along a first cutting line
Implementation Method 2
irradiating the laser to the mother substrate at second intervals different from the first intervals along the first cutting line overlapping edge areas
Data Source
AI summary
A cutting method of a mother substrate includes: irradiating a laser to the mother substrate at first intervals along a first cutting line overlapping dummy areas positioned adjacent to sides of each of display panel areas on the mother substrate; and irradiating the laser to the mother substrate at second intervals different from the first intervals along the first cutting line overlapping edge areas positioned adjacent to corner portions of each of the display panel areas.