Mask Frame Counterforce Control for Torsional Deformation in OLED Assembly
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Solution Overview
Problem
The deformation of a mask frame during the welding process in mask assembly for OLED displays leads to reduced positional accuracy of the patterned metal or organic emission layers, causing torsional forces that affect the deposition process.
Innovation Solution
A manufacturing apparatus with mask tensile units applying tensile force and counterforce application units that apply a counterforce to the mask frame, specifically at its upper portion, to prevent torsional deformation, ensuring accurate deposition by controlling the position of the counterforce application units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the mask frame is increased to reduce horizontal deformation, then the mask frame strength is improved, but the torsional deformation by the mask frame is increased
Solution Approach 1:
The patent applies a counterforce to the mask frame in the opposite direction of the tensile force before welding completes. This preliminary counteraction prevents the mask frame from rotating due to torsional force, thereby maintaining positional accuracy of the pattern even when using a thicker mask frame for strength.
Solution Approach 2:
The patent introduces a counterforce application unit that applies a force opposite to the tensile force acting on the mask frame. This counterforce acts as a mechanical counterweight to balance the torsional moment, preventing rotational deformation and maintaining manufacturing precision.
2Strength
If tensile welding is applied to attach the mask to the mask frame, then the mask is securely fixed, but torsional force is generated causing mask frame rotation
Solution Approach 1:
The counterforce is applied during the welding process before the tensile force fully sets. This preliminary counteraction prevents the mask frame from rotating under torsional stress, ensuring positional accuracy is maintained while still achieving secure attachment through tensile welding.
Solution Approach 2:
The counterforce application unit is positioned and configured before welding begins. This preliminary setup ensures that the counterforce is immediately available to counteract torsional forces as soon as tensile welding starts, preventing rotation from occurring in the first place.
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 minimizes torsional deformation of the mask frame, maintaining positional accuracy of the deposition layers and preventing horizontal deformation, thereby ensuring precise deposition processes even with thicker mask frames.
Implementation Method 1
a plurality of mask tensile units configured to apply a tensile force to a mask
Implementation Method 2
A plurality of counterforce application units are configured to apply a counterforce in an opposite direction to the direction of the tensile force to a mask frame
Implementation Method 3
When the mask is welded to the mask frame in the extended state, the mask frame may be deformed due to an elastic restoration force of the mask
Implementation Method 4
the mask frame may be deformed due to an elastic restoration force of the mask
Data Source
AI summary
A manufacturing apparatus for a mask assembly includes a plurality of mask tensile units configured to apply a tensile force to a mask. A plurality of counterforce application units are configured to apply a counterforce in an opposite direction to the direction of the tensile force to a mask frame to which the mask is attached. The counterforce application units are configured to apply the counterforce to an upper portion of a side of the mask frame.