Carbon-Based Thin Film Shadow Mask for UHD Displays
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Solution Overview
Problem
Current fine metal masks used in electroluminescent displays face challenges in producing high-resolution, ultra-high definition patterns with low power consumption and high thermal stability, particularly due to limitations in mass production yield and thermal expansion coefficients, making them unsuitable for advanced display technologies like virtual reality devices.
Innovation Solution
A carbon-based thin film shadow mask is manufactured using a method involving a buffer layer, metal layer patterning, amorphous carbon layer formation, crystalline carbon layer growth through interlayer switching, and subsequent etching to create a thin, high-resolution mask with low thermal expansion, utilizing materials like graphene and transition metals to enhance adhesion and prevent diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electroforming method is used to manufacture fine metal mask, then high-resolution patterns can be formed, but mass production yield is low
Solution Approach 1:
The patent uses a disposable fine metal mask that is formed through electroforming and then intentionally damaged to create through-holes. This allows the mask to be used once for pattern transfer and then discarded, eliminating the need for complex through-hole formation processes and enabling mass production while maintaining high pattern resolution.
Solution Approach 2:
The fine metal mask is formed in advance through electroforming to achieve high precision, then deliberately damaged to create through-holes before the actual deposition process. This preliminary formation of the mask structure with pre-created through-holes enables both high resolution and efficient mass production.
2Manufacturing precision
If laser etching method is used to manufacture fine metal mask, then through-holes can be formed, but coefficient of thermal expansion cannot be lowered
Solution Approach 1:
The patent employs a disposable fine metal mask where through-holes are formed by intentional damage rather than laser etching. This approach avoids the thermal effects of laser processing, preventing thermal expansion issues while achieving the required through-hole formation for pattern transfer.
Solution Approach 2:
The patent extracts the through-hole formation step from the thermal laser etching process and replaces it with a mechanical damage approach. This separation eliminates the harmful thermal effects while retaining the functional benefit of through-hole creation for pattern deposition.
3Manufacturing precision
If fine metal mask is used for UHD pattern formation, then high resolution is achieved, but shadow effect increases due to mask thickness
Solution Approach 1:
The patent uses an ultra-thin fine metal mask with minimized thickness to reduce the shadow effect during deposition. The mask is formed as a thin film structure that allows sufficient pattern resolution for UHD displays while minimizing the geometric shadowing that occurs with thicker masks.
Solution Approach 2:
The patent intentionally damages the fine metal mask to create through-holes, using a controlled amount of damage that is sufficient for pattern transfer but minimal enough to maintain mask integrity and minimize shadow effects. This partial action approach achieves the necessary functionality without excessive material removal that would increase thickness variations.
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 method enables the production of thin film shadow masks with minimized shadow effects, allowing for high-resolution pattern formation and reduced thermal expansion, suitable for advanced display technologies like UHD displays, while maintaining low power consumption.
Implementation Method 1
diffusing carbon in the amorphous carbon layer into the metal layer
Implementation Method 2
The buffer layer may be a single thin film or a heterogeneous multi-layer thin film made of at least one selected from the group consisting of a nitride film (SiNx) and an oxide film (SiO2). This may increase adhesion between the finally formed graphene and the buffer layer
Data Source
AI summary
A method for manufacturing a carbon-based thin film shadow mask includes the steps of a) forming a buffer layer on a substrate, b) depositing a metal layer on the buffer layer and then patterning the metal layer, c) forming an amorphous carbon layer on the patterned metal layer, d) forming a crystalline carbon layer on the buffer layer by switching the metal layer and the amorphous carbon layer, e) removing the amorphous carbon layer exposed to the outside, f) removing the metal layer, and g) separating the buffer layer and the crystalline carbon layer.