Split Mask Clamping Asymmetry for Wave-Free Tensioning
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Solution Overview
Problem
Conventional split mask assembly techniques face challenges in achieving precise adhesion and deposition efficiency due to wave formation when split masks are not tensioned evenly, leading to reduced precision and adhesion between the masks and substrates.
Innovation Solution
The introduction of a split mask design with symmetrically disposed clamping portions, including a first clamping portion extending horizontally and a second clamping portion extending diagonally, along with corresponding tensioning instruments to apply tension along the length and width of the split mask, ensuring even tension distribution and minimizing wave formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the split mask is attached to the frame without tensioning, then the attachment process is simpler and faster, but waves are formed in the mask body which decrease adhesion and deteriorate deposition precision
Solution Approach 1:
The split mask is tensioned in the lengthwise direction before being attached to the frame. This preliminary tensioning action ensures the mask is in a taut state during attachment, preventing wave formation and maintaining deposition precision while still allowing for efficient assembly
Solution Approach 2:
The mask is divided into multiple split masks that are attached to the frame separately. Each split mask can be independently tensioned and attached, which maintains precision while streamlining the overall attachment process
2Device complexity
If the split mask is tensioned only in the lengthwise direction, then the attachment process is simpler, but waves are still formed in the widthwise direction reducing adhesion
Solution Approach 1:
The clamping portions are designed with asymmetric extensions - a first clamping portion with first and second extensions, and a second clamping portion with first and second extensions. This asymmetric design enables differential tensioning in lengthwise and widthwise directions, ensuring the mask is pulled tight in both directions to eliminate waves and improve adhesion
Data Source
AI summary
Provided is a split mask including a stick main body in which a deposition pattern is formed, a clamping portion extending from opposing ends of the stick main body away from the stick main body, wherein the clamping portion includes a first clamping portion extending horizontally from the stick main body, and a second clamping portion extending diagonally from the stick main body.