Mask Assembly with Stick for Bezel-less Display Deposition
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Solution Overview
Problem
The development of display panels with bezel-less designs requires a mask assembly and deposition apparatus capable of creating deposition openings with varying sizes and shapes to accommodate different emission areas, posing a challenge in achieving precise and efficient deposition patterns for light emitting elements.
Innovation Solution
A mask assembly comprising a frame, a mask with main and sub-deposition openings, and a stick with patterned sub-deposition openings, where the stick is positioned between the mask and frame to support the mask and create a flat surface for deposition, allowing for the deposition of emission patterns with different areas and shapes on the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single mask structure is used for deposition, then the device structure is simple, but it cannot accommodate different emission areas required for bezel-less designs
Solution Approach 1:
The mask assembly is divided into a mask body with first openings and a separate stick with second openings. This segmentation allows each component to be optimized independently - the mask body handles main emission areas while the stick handles sub emission areas, enabling versatile deposition patterns without overly complicating the overall structure.
Solution Approach 2:
The stick is disposed within the frame structure and positioned to align with the mask body, creating a nested configuration. The stick with sub openings fits into the spatial arrangement alongside the mask body with main openings, allowing multiple functional elements to coexist in a compact integrated assembly.
2Strength
If the stick thickness is increased to support the mask, then the structural strength is improved, but the coplanarity with the mask surface deteriorates
Solution Approach 1:
The stick features a removed portion that creates a local variation in thickness. This local quality change allows the stick to have sufficient overall strength while creating a specific region where the upper surface aligns coplanarly with the mask, solving both structural and precision requirements simultaneously.
3Adaptability or versatility
If deposition openings of uniform size are used, then the mask manufacturing is simple, but it cannot deposit light emitting elements on different areas with varying sizes
Solution Approach 1:
Different regions of the mask assembly have different opening characteristics - the mask body has first openings suited for main emission areas while the stick has second openings designed for sub emission areas. This local differentiation in opening properties enables versatile deposition patterns across different areas without requiring a completely complex redesign of the entire mask.
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
Enables the precise deposition of emission patterns with varying sizes and shapes on display panels, enhancing the efficiency and accuracy of light emission areas, particularly in bezel-less designs, by using a mask assembly with main and sub-deposition openings and a supporting stick to ensure uniform deposition across the panel.
Implementation Method 1
a deposition apparatus including the mask assembly
Data Source
AI summary
A mask assembly includes a frame including a frame opening, a mask disposed on the frame, the mask including a deposition part including main deposition openings overlapping the frame opening, and a non-deposition part adjacent to the deposition part, wherein a coupling opening is formed between the deposition part and the non-deposition part, and a stick including a support part overlapping the non-deposition part and a pattern part overlapping the coupling opening, the pattern part protruding from the support part and including sub deposition openings, wherein the stick is disposed between the mask and the frame.