Laser Cutting Angles for Flexible Display Pad Carbonization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During the cutting process of unit display apparatuses from a mother substrate, metal wirings can carbonize due to heat generated, complicating the manufacturing of flexible display apparatuses based on organic light-emitting display technology.
Innovation Solution
A method involving the use of laser beam machining to cut the display substrate and supporting unit at different angles, with a high energy density laser beam cutting the supporting unit and a low energy density laser beam cutting the display substrate, while inverting the display apparatus to prevent pad area carbonization, and using protective films to manage the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam is used to cut the display substrate and supporting unit, then cutting precision and efficiency are improved, but the metal wirings in the pad area may carbonize due to heat generation
Solution Approach 1:
The cutting process is divided into two distinct stages: first cutting the supporting unit, then cutting the display substrate. This segmentation allows different cutting parameters to be applied to each stage, preventing pad carbonization while maintaining cutting precision.
Solution Approach 2:
The supporting unit is cut before the display substrate is cut. This preliminary action removes the heat-generating supporting unit first, so that subsequent cutting of the display substrate does not cause heat accumulation that would carbonize the metal wirings in the pad area.
2Object-affected harmful factors
If the display apparatus is inverted during cutting, then pad area carbonization is prevented, but the device complexity increases due to additional inverting steps
Solution Approach 1:
The display apparatus is inverted during the cutting process so that the pad area faces away from the laser beam. This inversion prevents the metal wirings in the pad area from being exposed to excessive heat and carbonizing, while the cutting is still performed effectively on the supporting unit and display substrate.
3Manufacturing precision
If different cutting angles are used for the display substrate and supporting unit, then cutting quality is improved, but the processing time increases
Solution Approach 1:
The cutting process uses dynamic adjustment of cutting angles and laser parameters. The first cutting stage (supporting unit) and second cutting stage (display substrate) employ different cutting angles optimized for each material, achieving high cutting quality while minimizing total processing time through efficient parameter switching.
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
Prevents carbonization of pads and reduces processing time by effectively cutting the display apparatuses along specified angles, ensuring efficient separation of unit display apparatuses without damaging the metal wirings.
Implementation Method 1
consecutively cutting the display panel and the at least one supporting unit by irradiating a laser beam
Data Source
AI summary
A method of manufacturing a display apparatus includes separating a mother substrate that includes a plurality of connected unit display apparatuses into a plurality of separated unit display apparatuses. Each separated unit display apparatus includes a display panel and at least one supporting unit attached below the display panel. The display panel includes a display substrate that has a pad area on which are disposed a plurality of pads and a thin film encapsulation layer on the display substrate. The method further includes consecutively cutting the display panel and the at least one supporting unit of each separated unit display apparatus along cutting lines in the pad area, where a first cut surface of the pad area of the display substrate and a second cut surface of the at least one supporting unit are respectively cut at different angles.