Mask Frame Assembly Edge Welding for OLED Evaporation Flatness
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Solution Overview
Problem
The edges of evaporation masks in mask frame assemblies tend to curl up during the evaporation process due to unfixed edges, affecting the flatness and evaporation effect in OLED panel fabrication.
Innovation Solution
A mask frame assembly design with a frame, covering mask, and evaporation masks arranged with specific grooves and welding spots to ensure complete edge welding, preventing curling and enhancing flatness, including a first groove with welding and weldless portions and a supporting mask to prevent curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the evaporation mask is welded onto the frame, then the mask can be fixed in position, but the edges of the mask tend to curl up due to heat and magnetic force during evaporation
Solution Approach 1:
The frame is divided into multiple segments with grooves positioned at specific locations. The evaporation mask is segmented into multiple parts that fit into these grooves, allowing differential welding and support to address curling at different locations simultaneously.
Solution Approach 2:
Grooves are pre-formed in the frame structure before assembling the evaporation mask. This preliminary structural preparation ensures that the mask edges are constrained from the beginning, preventing curling during the evaporation process before it occurs.
2Ease of manufacture
If the edges of the evaporation mask are left unfixed, then the assembly process is simpler, but the edges curl up affecting evaporation effect
Solution Approach 1:
Different regions of the frame are designed with different properties: some areas have grooves for mask support while others have welding spots for securing. This local differentiation allows simple overall assembly while providing precise edge fixation where needed to prevent curling and maintain evaporation quality.
3Ease of manufacture
If welding spots are placed far from the mask edges, then the welding process is easier, but the mask edges curl up due to insufficient constraint
Solution Approach 1:
Grooves serve as intermediary structures between the frame and the evaporation mask edges. These grooves provide a mechanical interface that constrains the mask edges directly, eliminating the need to place welding spots extremely close to the edges while still achieving stable fixation.
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 ensures complete edge welding of evaporation masks, maintaining flatness and improving the evaporation effect by reducing the distance between welding spots and edges to 0.3 mm, preventing curling and shadow formation on the pattern.
Implementation Method 1
the welding spots weld the evaporation mask with the frame together
Implementation Method 2
The supporting mask supports the evaporation mask to prevent the evaporation mask from being curved down in its length direction
Implementation Method 3
The fabrication of the OLED includes evaporating an organic material onto an array substrate
Data Source
AI summary
A mask frame assembly, an evaporation method and an array substrate are provided. The mask frame assembly according to the disclosure includes a frame, a covering mask and at least two evaporation masks, the evaporation masks are sequentially arranged on the frame with a gap between two adjacent evaporation masks. A first groove is arranged at a location corresponding to the gap in the frame. The first groove includes a first groove welding portion and a first groove weldless portion, the evaporation mask includes a first evaporation sub-mask corresponding to the first groove welding portion and a second evaporation sub-mask corresponding to the first groove weldless portion; and an edge of the first evaporation sub-mask and an edge of the first groove welding portion coincide.