Laser Machining Vacuum Window Transfer for OLED Contamination Control
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Solution Overview
Problem
The inefficiency in laser machining processes for organic light emitting displays due to contamination of protection windows in vacuum chambers, which requires frequent chamber opening for cleaning or replacement, leading to reduced production efficiency and potential moisture or oxygen exposure to sensitive OLEDs.
Innovation Solution
A laser apparatus with a dual vacuum chamber system and a transfer unit that allows for contamination detection and automatic replacement of protection windows without opening the vacuum chamber, maintaining a high vacuum environment and minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection window is used in the vacuum chamber to protect against particle contamination, then the chamber can maintain vacuum integrity, but the protection window becomes contaminated and requires replacement which reduces production efficiency
Solution Approach 1:
The protection window system is segmented into multiple replaceable windows. Instead of replacing the entire chamber window assembly, individual protection windows can be independently replaced through the transfer unit, minimizing disruption to the vacuum chamber and maintaining production efficiency while preserving vacuum integrity.
Solution Approach 2:
A transfer unit acts as an intermediary mechanism between the vacuum chamber and external environment. This intermediary allows protection windows to be replaced without breaking the vacuum seal of the main chamber, thus maintaining vacuum integrity while enabling efficient window replacement.
2Ease of repair
If the vacuum chamber is opened for protection window replacement, then contaminated windows can be replaced, but the chamber must be re-vacuumed causing downtime
Solution Approach 1:
The transfer unit serves as an intermediary that enables window replacement through a separate vacuum chamber or transfer path. This allows the main machining chamber to remain sealed and maintain vacuum without opening, eliminating the need for re-vacuuming and reducing downtime to minimal transfer time.
Solution Approach 2:
Clean protection windows are prepared in advance in a separate vacuum chamber or storage area. When replacement is needed, pre-prepared windows are already available and can be transferred immediately, eliminating preparation time and reducing overall replacement downtime.
3Productivity
If laser machining is performed on OLED substrates, then production speed is increased, but particles from the substrate contaminate the protection window
Solution Approach 1:
The protection window is extracted as a separate, sacrificial component that can be removed and replaced independently. Particle contamination is effectively 'taken out' of the system by transferring it to a replaceable window rather than contaminating the entire chamber or critical optics, allowing high-speed machining to continue with minimal interruption.
Solution Approach 2:
The protection window functions as a disposable or short-living component designed to be replaced rather than cleaned. This approach is more efficient than attempting to remove particle contamination, as replacement is faster and ensures optimal optical performance without the time-consuming cleaning process.
4Ease of repair
If OLED substrates are exposed during chamber opening, then protection windows can be replaced, but moisture and oxygen may damage the sensitive OLEDs
Solution Approach 1:
The transfer unit acts as an intermediary vacuum system that isolates the OLED substrates from the external environment during window replacement. Substrates remain in the sealed main chamber under vacuum, while the transfer unit handles window replacement in a separate vacuum space, preventing moisture and oxygen exposure.
Solution Approach 2:
The vacuum system is segmented into at least two separate vacuum zones: the main machining chamber containing the OLED substrates, and a transfer chamber or transfer path for window replacement. This segmentation allows independent access for window replacement without exposing substrates to atmospheric conditions, preventing moisture and oxygen damage.
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
Enables continuous high-vacuum laser machining with increased production efficiency and improved reliability of OLEDs by preventing contamination and exposure to moisture or oxygen, thus maintaining machining quality and component reliability.
Implementation Method 1
a laser beam emitted by the laser passes through the chamber window and the first protection window, and is emitted to one surface of the target substrate
Data Source
AI summary
A laser apparatus includes: a first vacuum chamber, wherein machining is performed on a target substrate in the first vacuum chamber; a laser facing the first vacuum chamber; a carrier disposed in the first vacuum chamber, wherein the target substrate is seated on the carrier; a chamber window disposed in one surface of the first vacuum chamber, wherein a laser beam emitted by the laser passes through the chamber window; a first protection window positioned between the carrier and the chamber window; a second vacuum chamber disposed at a first side of the first vacuum chamber; and a transfer unit configured to transfer the first protection window to the second vacuum chamber.