Laser Lift-Off Mirror Control for Flexible Substrate Separation
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Solution Overview
Problem
Flexible substrates in display devices are prone to damage during the laser lift-off process due to their high flexibility, necessitating effective support and precise energy application to prevent component damage.
Innovation Solution
A laser lift-off apparatus with a driving mirror unit that adjusts the direction and position of laser beams to control energy density distribution, allowing for controlled lift-off of the carrier substrate from the panel substrate without damaging the display device components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser beam is applied to separate carrier substrate from panel substrate, then separation efficiency is improved, but display device components may be damaged due to excessive energy
Solution Approach 1:
The patent applies different energy densities to different regions of the carrier substrate. The driving mirror unit directs the laser beam to create a scanned pattern where energy is concentrated at the interface between carrier substrate and panel substrate to achieve separation, while peripheral regions receive reduced energy to protect display device components from damage. This spatial variation in energy distribution resolves the contradiction between separation efficiency and component protection.
Solution Approach 2:
The patent employs a driving mirror unit that dynamically adjusts the laser beam path through rotation and positioning mechanisms. This dynamic control allows the laser beam to be precisely directed and scanned across the carrier substrate surface, enabling real-time adjustment of energy distribution to optimize separation while preventing damage to sensitive components.
2Manufacturing precision
If laser energy is concentrated to improve separation precision, then manufacturing precision is improved, but risk of component damage increases
Solution Approach 1:
The patent implements local quality by directing concentrated laser energy specifically to the separation interface while reducing energy exposure in surrounding areas. The driving mirror unit enables precise positioning of high energy density zones exactly where needed for separation, while peripheral display device components receive minimal energy exposure, thus achieving high separation precision without increasing damage risk.
Solution Approach 2:
The driving mirror unit acts as an intermediary between the laser source and the carrier substrate. It controls and modulates the laser beam path, distributing energy precisely where needed for separation while preventing excessive energy concentration that could damage components. This intermediary control mechanism enables fine-tuned energy management.
3Device complexity
If laser beam path is fixed for simple apparatus design, then device complexity is reduced, but ability to control energy distribution is limited
Solution Approach 1:
The patent introduces dynamic elements (rotating and positionable driving mirrors) to enable flexible laser beam path control. While this increases device complexity compared to a fixed beam path, it provides precise control over energy distribution across the carrier substrate, allowing optimization of both separation precision and component protection that would be impossible with a fixed apparatus.
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 apparatus effectively prevents damage to display device components by ensuring appropriate energy application, facilitating safe and efficient separation of the substrates.
Implementation Method 1
a driving mirror unit which changes an advancing path of at least a portion of the laser beam
Implementation Method 2
a laser beam generating unit which generates a laser beam; an optical unit which receives the laser beam to generate output light
Data Source
AI summary
A laser lift-off apparatus includes a laser beam generating unit which generates a laser beam, an optical unit which receives the laser beam and generates output light based on the laser beam; and a stage unit including a stage. The optical unit includes a driving mirror unit which changes an advancing path of at least a portion of the laser beam, where a direction or a position of the driving mirror unit is changeable.