OLED Evaporation Mask Strip with Variable Opening Density
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Solution Overview
Problem
Existing evaporation mask plates in OLED display devices lack diversity in evaporation products, leading to uneven force distribution and poor tensioning net quality, resulting in deformation and reduced evaporation yield.
Innovation Solution
A mask strip with evaporation regions of varying specifications, including different shapes and densities of evaporation openings, is designed to ensure uniform force distribution and improve tensioning net quality by gradually decreasing opening density towards the edges, with symmetrical and transition regions to manage stress distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If evaporation mask plate uses uniform evaporation regions, then manufacturing process is simple, but force distribution is uneven and tensioning net quality is poor
Solution Approach 1:
The patent applies local quality by dividing the mask strip into multiple evaporation regions with different opening densities. The first evaporation region has a first opening density while the second evaporation region has a second opening density that differs from the first. This creates local variations in structural properties to achieve uniform force distribution across different areas of the mask strip, resolving the contradiction between manufacturing simplicity and force distribution uniformity.
2Device complexity
If evaporation mask plate uses single specification evaporation regions, then device structure is simple, but evaporation product diversity is limited
Solution Approach 1:
The patent implements local quality by creating distinct evaporation regions with different opening densities - the first evaporation region with a first opening density and the second evaporation region with a second opening density. This allows the single mask strip to support diverse evaporation products with different specifications while maintaining overall structural simplicity, thus resolving the contradiction between device complexity and adaptability.
3Ease of manufacture
If evaporation openings density is uniform across mask strip, then manufacturing is easier, but tensioning net quality deteriorates
Solution Approach 1:
The patent applies local quality by specifying that the first evaporation region has a first opening density and the second evaporation region has a second opening density, where the densities differ between regions. This local variation in opening density improves tensioning net quality by ensuring uniform force distribution across the mask strip, while still maintaining ease of manufacture through a systematic regional division approach.
Data Source
AI summary
A mask strip and a mask device are provided. The mask strip includes a body part, the body part includes two connecting ends arranged in a first direction, the body part further includes at least two evaporation region sets, the evaporation region sets are located between the two connecting ends, each of the evaporation region sets includes at least one evaporation region, each of the evaporation regions includes a plurality of evaporation openings, a number density of the evaporation openings within each of the evaporation regions is a predetermined density, and the predetermined density within any one of the evaporation regions of the evaporation region sets located adjacent to a middle position of the mask strip in the first direction is larger than the predetermined density of any one of the evaporation regions of the evaporation region sets located away from the middle position.