Foldable Display Laser Cutting to Minimize Polymer Base Carbonization
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Solution Overview
Problem
During the manufacture of foldable display devices, laser cutting of the polymer base layer can cause heat generation, leading to carbonization and adverse effects on the folding and reliability of the device.
Innovation Solution
The process involves performing laser cutting at high speed with low energy density, applying the laser multiple times, and using a method where the laser oscillator moves along the cutting line while the primary member is scanned, minimizing the carbonized region by physically tearing off the outer surface of the shock absorber rather than cutting it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser cutting is performed on the polymer base layer during manufacture, then the display device can be fabricated with precise dimensions, but heat is generated causing carbonization that adversely affects folding and reliability
Solution Approach 1:
The laser oscillation moves periodically along the cutting line, applying laser energy in a controlled oscillating manner rather than continuous exposure. This periodic action allows heat to dissipate between oscillation cycles, preventing carbonization while maintaining cutting precision
Solution Approach 2:
The laser oscillation rapidly skips along the cutting line at high speed, minimizing the total exposure time of any single point to laser energy. This rushing through the cutting process reduces heat accumulation and prevents carbonization of the polymer base layer
2Productivity
If laser energy density is increased to improve cutting speed, then productivity increases, but heat generation increases causing more carbonization and damage
Solution Approach 1:
The laser oscillation parameters (amplitude, frequency, speed) are dynamically adjusted along the cutting line to optimize the balance between cutting efficiency and heat control. The oscillating motion creates a dynamic cutting process that maintains productivity while minimizing thermal damage
Solution Approach 2:
The laser cutting process changes multiple parameters including oscillation amplitude, oscillation frequency, and scanning speed to achieve effective cutting without excessive heat generation. By modifying these parameters, the process maintains high productivity while preventing carbonization
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 approach reduces damage from heat generated during laser cutting, minimizing the carbonized region and enhancing the folding and reliability of the display device.
Implementation Method 1
when the polymer base layer is irradiated with a laser, heat is generated by the laser irradiation
Implementation Method 2
heat is generated by the laser irradiation, thereby forming a carbonized region
Implementation Method 3
The laser cutting operation may be performed a plurality of times with the laser having low energy density at a high scanning speed, thereby minimizing the carbonized region
Data Source
AI summary
Methods of manufacturing display devices are capable of minimizing damage due to heat generated in the laser cutting process during manufacturing the display device.