Deposition Mask Assembly Welding Geometry
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Solution Overview
Problem
Existing deposition mask assemblies suffer from substrate damage due to weld beads protruding towards the top surface and damage to the deposition pattern caused by welding between the mask and the mask frame.
Innovation Solution
A deposition mask assembly design featuring a mask with a deposition pattern and a mask frame where the first surface of the mask edge is welded to the first surface of the mask frame, with welding holes along the circumference of the opening, and additional surfaces forming a closed curved line to prevent sparks and accommodate a welding rod, ensuring the weld bead protrudes away from the substrate and deposition pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is performed between the mask and mask frame to secure fixation, then the mask is firmly fixed to the mask frame, but weld beads protrude toward the top surface causing substrate damage
Solution Approach 1:
The welding surface is moved from the top surface (first surface) to the bottom surface (second surface) of the mask frame, changing the spatial dimension of the welding operation. This prevents weld beads from protruding toward the substrate while maintaining fixation strength through the repositioned welding interface.
Solution Approach 2:
The mask frame is divided into distinct surfaces: a first surface for substrate proximity, a second surface for welding operations, and a third surface for structural support. This segmentation isolates the welding process to a specific region away from the substrate, preventing harmful weld bead protrusion while maintaining overall structural integrity.
2Strength
If welding is performed between the mask and mask frame, then the mask is securely fixed, but the deposition pattern is damaged by welding debris
Solution Approach 1:
The welding operation is relocated to the bottom surface of the mask frame, away from the deposition pattern area. This spatial repositioning prevents welding debris from contaminating or damaging the deposition pattern while maintaining secure fixation between the mask and mask frame.
Solution Approach 2:
The mask frame structure is segmented into functional zones: the first surface area for substrate interaction, the second surface for welding operations, and the third surface for structural support. This segmentation isolates welding debris generation to a specific zone away from the deposition pattern, protecting manufacturing precision.
3Ease of manufacture
If the mask frame structure is simplified, then manufacturing is easier, but the mask cannot be securely fixed without damaging the substrate or deposition pattern
Solution Approach 1:
The mask frame is designed with segmented surfaces (first, second, and third surfaces) that serve distinct functions. This segmentation allows for secure fixation through dedicated welding surfaces while maintaining manufacturing simplicity through the straightforward geometric division of functional zones.
Solution Approach 2:
The welding interface is positioned on the bottom surface of the mask frame rather than the top surface, utilizing the vertical dimension to separate welding operations from substrate interaction. This maintains fixation strength while avoiding substrate damage without requiring complex structural modifications.
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 substrate damage from weld beads and protects the deposition pattern from welding debris, ensuring accurate and undamaged thin film deposition on the substrate.
Implementation Method 1
a first surface of the edge of the mask and a first surface of the mask frame adjacent to the opening which face each other are welded to each other
Data Source
AI summary
A deposition mask assembly includes: a mask in which a deposition pattern is formed and a mask frame fixed to an edge of the mask, an opening being formed at a center of the mask frame. A first surface of the edge of the mask and a first surface of the mask frame adjacent to the opening which face each other are welded to each other.