Mask Frame Tensile Bar Contraction Force
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Solution Overview
Problem
The deformation of mask frames during the deposition process for forming light emitting layers in display devices can lead to reduced deposition reliability due to sagging or bending, affecting the quality of the light emitting layer.
Innovation Solution
A mask frame design incorporating a tensile bar that applies a contraction force to the frame's horizontal and vertical portions to counteract bending deformation, ensuring stability and improving deposition quality by preventing sagging or bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mask frame is used to support the mask during deposition, then the mask can be properly positioned and the deposition process can proceed, but the mask frame may deform due to bending or sagging which reduces deposition reliability
Solution Approach 1:
The patent applies preliminary action by pre-stretching the mask frame in the longitudinal direction before deposition. The frame is stretched by a predetermined amount (e.g., 0.1-1 mm) and fixed in this pre-deformed state. During deposition, as the frame naturally sags or bends, the pre-applied tension counteracts this deformation, maintaining the mask's positional stability and ensuring reliable deposition throughout the process.
Solution Approach 2:
The patent changes the physical parameter of the mask frame by intentionally deforming it in the longitudinal direction before use. The frame's length is adjusted by stretching it to exceed its original length, and this altered dimensional state is maintained through fixation mechanisms. This parameter change allows the frame to compensate for expected sagging during deposition, resolving the contradiction between maintaining shape stability and allowing controlled deformation for reliability.
2Stability of the object's composition
If the mask frame is made more rigid to prevent bending, then shape stability improves, but the complexity of the frame structure and manufacturing process increases
Solution Approach 1:
Instead of increasing structural complexity to prevent bending, the patent applies preliminary deformation to the frame. By pre-stretching and fixing the frame in a controlled manner, the solution achieves shape stability through a simple procedural step rather than through complex structural design, thus avoiding increased device complexity while maintaining stability.
Solution Approach 2:
The patent resolves the contradiction by changing the frame's dimensional parameter (length) in a controlled way before use, rather than modifying the structural design. This parameter change approach maintains the simplicity of the frame structure while achieving the desired shape stability during deposition.
3Manufacturing precision
If the mask frame is stretched to prevent sagging, then deposition quality improves, but the frame may become permanently deformed or damaged
Solution Approach 1:
The patent applies preliminary stretching within carefully controlled limits to prevent permanent damage. The frame is stretched by a predetermined, small amount (e.g., 0.1-1 mm) that is sufficient to counteract expected sagging during deposition but remains within the elastic deformation range of the frame material. This controlled preliminary action improves deposition quality without compromising structural integrity.
Solution Approach 2:
The patent carefully controls the parameter of deformation magnitude to resolve the contradiction. By limiting the stretch to a specific, small range, the frame's dimensional parameter is adjusted enough to improve deposition quality while remaining within safe limits that prevent permanent deformation or damage to the frame's structural integrity.
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 use of a tensile bar in the mask frame significantly improves the deposition quality by maintaining the frame's shape and stability during the deposition process, enhancing the reliability of the light emitting layer formation.
Implementation Method 1
a tensile bar coupled to the first horizontal portion, and the tensile bar is configured to apply a contraction force to the first horizontal portion in a longitudinal direction of the tensile bar
Implementation Method 2
a tensile bar coupled to the vertical portion and the stage and which is configured to apply a contraction force to the vertical portion
Data Source
AI summary
A mask frame includes a first horizontal portion, a second horizontal portion disposed under the first horizontal portion, at least one vertical portion connecting the first horizontal portion and the second horizontal portion and a tensile bar coupled to the first horizontal portion, and the tensile bar is configured to apply a contraction force to the first horizontal portion in a longitudinal direction of the tensile bar.