Mask Assembly Shielding for Display Deposition Precision
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Solution Overview
Problem
Existing mask assemblies used in manufacturing display apparatuses with irregular shapes are prone to thermal deformation and tensile force-induced distortions, leading to deviations from design values and quality defects.
Innovation Solution
A mask assembly design featuring a mask frame with a mask sheet, first and second shielding sheets that create distinct deposition areas with different shapes, where the shielding sheets are symmetrically arranged to minimize deformation and maintain the intended shape during the deposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mask assembly is used to form irregular-shaped display areas, then the display area can be formed with various shapes, but the mask assembly is prone to thermal deformation and tensile force-induced distortions causing deviations from design values
Solution Approach 1:
The mask assembly is divided into multiple independent shielding sheets (first shielding sheet, second shielding sheet, third shielding sheet) that can be positioned and adjusted separately. Each shielding sheet has multiple shielding portions that can be independently configured, allowing the mask assembly to adapt to irregular display area shapes while maintaining precision through modular adjustment rather than relying on a single rigid structure.
Solution Approach 2:
The mask assembly incorporates adjustable positioning mechanisms that allow the shielding sheets to be dynamically positioned and fixed at different locations. This dynamic adjustability enables the mask assembly to compensate for thermal deformation and tensile forces by repositioning components to maintain the intended deposition area shape throughout the manufacturing process.
2Manufacturing precision
If shielding sheets are added to define deposition areas, then the deposition area shape precision is improved, but the device complexity increases
Solution Approach 1:
Multiple shielding sheets serve multiple functions: they define the deposition area boundaries, compensate for thermal deformation, accommodate irregular display shapes, and provide adjustable positioning. This multi-functionality reduces the need for separate components for each purpose, thereby managing complexity while achieving high precision.
Solution Approach 2:
Different shielding sheets and shielding portions are strategically positioned at specific locations where deformation is most likely to occur or where precise shape definition is most critical. This localized approach concentrates complexity only where needed rather than uniformly across the entire mask assembly, optimizing the balance between precision and complexity.
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
The solution effectively reduces deformation and maintains the precision of the deposition area, ensuring that the formed display area matches the designed shape, thereby improving the quality and accuracy of the display apparatus.
Implementation Method 1
a deposition source; a mask assembly facing the deposition source to allow a deposition material ejected from the deposition source to pass therethrough
Data Source
AI summary
A mask assembly, and an apparatus and method for manufacturing a display apparatus by using the mask assembly are provided. A mask assembly includes: a mask frame; a mask sheet on the mask frame and including a plurality of openings; at least two first shielding sheets on the mask frame and shielding some of the plurality of openings of the mask sheet; and at least two second shielding sheets on the mask frame and shielding some of the plurality of openings of the mask sheet, the at least two first shielding sheets and the at least two second shielding sheets define a deposition area including some of the plurality of openings of the mask sheet by shielding some of the plurality of openings of the mask sheet, and the deposition area is divided into a first deposition area and a second deposition area.