Deposition Mask Dimensional Screening for Stretch Hole Alignment
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Solution Overview
Problem
The challenge in manufacturing high-definition organic EL display devices lies in accurately reproducing the positions of through holes in a deposition mask to achieve the desired pixel density, particularly when the mask is stretched and applied to a substrate.
Innovation Solution
A method of quality determination and manufacturing of deposition masks involves measuring and determining the dimensions X1 and X2 between specific points on the mask, ensuring they satisfy certain equations to maintain positional accuracy, and selecting masks that meet these criteria for improved hole alignment during stretching and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a deposition mask is stretched to achieve high pixel density, then the display device can reach ultra-high definition, but the positional accuracy of through holes deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining the quality of the deposition mask before stretching. Specifically, the mask's dimensional stability is evaluated in advance by measuring dimensions at multiple points (including center and corner regions) and calculating variation ratios. Only masks meeting predetermined quality criteria are selected for stretching, ensuring that subsequent stretching produces consistent, accurate through hole positions without requiring post-stretching adjustment.
2Manufacturing precision
If the positional accuracy of through holes is improved by quality determination, then manufacturing precision increases, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent replaces complex physical measurement and adjustment mechanisms with a computational quality determination system. Instead of using sophisticated mechanical measurement devices or post-stretching adjustment mechanisms, the invention uses automated image processing and mathematical calculations (dimensional variation ratio computations) to evaluate mask quality. This substitution of mechanical/physical systems with computational methods achieves high precision while controlling process complexity.
Data Source
AI summary
A method of quality determination of a deposition mask according to the present disclosure includes: a measuring step that measures a dimension X1 from a P1 point to a Q1 point, and a dimension X2 from a P2 point to a Q2 point; and a determining step that determines a quality of a deposition mask, based on the dimension X1 and the dimension X2 measured in the measuring step.