Mask Assembly Height Correcting Member for Emissive Display Deposition
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Solution Overview
Problem
Existing mask assembly and deposition devices face deposition defects due to deformation of the frame's long and short sides, leading to misalignment and reduced pixel per accuracy (PPA) during the manufacturing of emissive display devices.
Innovation Solution
A mask assembly and deposition device featuring a height correcting member with different heights, made of metal, positioned between the frame and the mask fixing portion, which corrects the gap between the frame and the mask fixing portion, ensuring the mask is aligned parallel to the substrate and preventing deposition defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mask assembly is used for deposition, then the mask can define openings for depositing constituent elements, but deformation of the frame's long and short sides causes misalignment and deposition defects
Solution Approach 1:
The height correcting member is pre-installed on the frame before the mask is mounted. This preliminary action compensates for frame deformation in advance, ensuring that when the mask is installed, the gap between the mask and substrate remains consistent and deposition defects are prevented.
Solution Approach 2:
The height correcting member acts as an intermediary element between the frame and the mask fixing portion. It mediates the deformation issue by providing a compensating height difference, thereby maintaining proper alignment without requiring the frame itself to be perfectly rigid.
2Manufacturing precision
If the mask fixing portion is rigidly fixed to the frame, then the mask position is stable, but frame deformation causes gap variation and deposition defects
Solution Approach 1:
Instead of making the entire mask assembly complex, the height correcting member is applied locally at specific positions on the frame where deformation occurs. This localized approach maintains gap consistency without requiring complex modifications to the entire mask assembly structure.
Solution Approach 2:
The height correcting member changes the physical parameter (height) at specific locations on the frame. By adjusting this parameter locally, the gap between the mask and substrate is maintained consistently despite frame deformation, without complicating the overall device structure.
3Stability of the object's composition
If the frame is made more rigid to prevent deformation, then structural stability improves, but manufacturing complexity and cost increase
Solution Approach 1:
The deformation compensation function is extracted from the frame structure itself and implemented as a separate height correcting member. This allows the frame to be manufactured simply without deformation issues, while the correction function is provided by the additional component.
Solution Approach 2:
The height correcting member can be made from inexpensive materials and is designed as a separate, replaceable component. Rather than investing in complex, expensive rigid frame structures, the solution uses a simple, affordable correcting member that can be easily manufactured and replaced if needed.
Data Source
AI summary
A mask assembly includes a mask, a frame having an external portion surrounding an opening, a mask fixing portion including a long-side stick and a short-side stick for fixing the mask, and a height correcting member connecting the mask fixing portion and the external portion of the frame.