Grooved Magnet Assembly for Uniform Deposition Mask Adhesion
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Solution Overview
Problem
Existing magnet assemblies in light emitting display device deposition processes experience peak adhesive forces that can lead to defects in display panels, such as image quality issues like stripes, due to uneven magnetic forces applied to the mask assembly during the deposition of emission layers.
Innovation Solution
A magnet assembly design featuring a yoke plate with strategically positioned magnets, each having a groove on one surface, which alternates polarity along one direction and is the same along a perpendicular direction, distributed to maintain average adhesive force while reducing peak adhesive force by distributing the magnetic force across a wider area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnets are arranged on a yoke plate to closely contact the deposition mask and substrate, then adhesive force is improved, but peak adhesive force becomes too high causing defects in display panels
Solution Approach 1:
The magnet assembly applies different magnetic field strengths to different regions of the deposition mask. By positioning magnets at specific locations and orientations, the assembly creates localized variations in adhesive force that match the structural requirements of the mask, ensuring adequate contact pressure where needed while avoiding excessive force that could cause defects.
Solution Approach 2:
The patent modifies the magnetic field parameters by changing the arrangement, polarity, and positioning of magnets. By adjusting these parameters, the assembly transforms the magnetic force distribution from a uniform high-force pattern to a controlled pattern with optimized peak forces, thereby maintaining effective adhesion while preventing defect formation.
2Manufacturing precision
If magnetic force is concentrated to maintain average adhesive force, then deposition quality is improved, but peak adhesive force increases causing stripes and image quality issues
Solution Approach 1:
The magnet assembly divides the magnetic force application into multiple discrete magnet units rather than using a single concentrated magnetic source. This segmentation allows the total magnetic force to be distributed across multiple contact points, maintaining the average adhesive force needed for quality deposition while preventing any single peak force from becoming excessive and causing stripe defects.
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
This design effectively reduces peak adhesive force, preventing defects in display panels by ensuring a consistent and controlled magnetic force application, thereby improving the uniformity and quality of the deposited emission layers.
Implementation Method 1
a magnet assembly in which magnets are arranged on a yoke plate may be used, and the substrate may be disposed between the deposition mask and the magnet assembly. The deposition mask and the substrate may closely contact each other with an adhesive force by magnetic force of the magnets.
Data Source
AI summary
A magnet assembly includes a support plate and a plurality of magnets which are removably fixed to the support plate and applies a magnetic force to a deposition mask. Each magnet among the plurality of magnets include a first surface facing the support plate, a second surface opposite to the first surface and facing the deposition mask, and a magnet groove defined therein.