Amorphous Boron Nitride Coating for Low-Reflection Display Surfaces
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Solution Overview
Problem
Display devices such as LCD and OLED devices suffer from contrast decrease and image overlap due to external light reflection, necessitating the use of an anti-reflection film, with existing boron nitride films not adequately addressing this issue.
Innovation Solution
An amorphous boron nitride film with specific structural and compositional properties, including an sp³ hybrid bond ratio less than 20%, refractive index of 1.0 to 1.5, and a thickness optimized for destructive interference, is used as an anti-reflection coating to reduce light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflection film is used to reduce light reflection, then reflectivity is reduced, but the film may have poor mechanical stability or high hydrogen content
Solution Approach 1:
The patent changes the chemical composition parameters of the anti-reflection film by incorporating boron nitride with specific B:N ratios (0.5-2.0) and controlling hydrogen content (<10 at%), which simultaneously achieves low refractive index (1.0-1.5) and high mechanical stability through strong covalent bonding
Solution Approach 2:
The patent uses composite amorphous boron nitride material that combines the low refractive index property (from the amorphous structure) with high mechanical stability (from the strong B-N covalent bonds), creating a material that simultaneously addresses both optical and mechanical requirements
2Object-affected harmful factors
If the refractive index of the anti-reflection film is reduced to minimize reflection, then optical performance is improved, but the film density and mechanical strength may be compromised
Solution Approach 1:
The patent optimizes the refractive index parameter to 1.0-1.5 by controlling the amorphous structure and composition of boron nitride, while simultaneously maintaining high mechanical strength through the inherent strong covalent bonding in the B-N network, breaking the traditional trade-off between optical and mechanical properties
3Ease of manufacture
If hydrogen content in the anti-reflection film is increased to improve deposition process, then film formation is easier, but chemical stability and mechanical properties deteriorate
Solution Approach 1:
The patent严格控制 hydrogen content to less than 10 at% in the amorphous boron nitride film, which maintains chemical stability and strong covalent bonding while still allowing for practical deposition through plasma-enhanced chemical vapor deposition processes, optimizing both manufacturability and performance
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 amorphous boron nitride film effectively reduces light reflection, maintaining high mechanical and chemical stability while enhancing image clarity and reducing contrast issues in display devices.
Implementation Method 1
the refractive index of the amorphous boron nitride film with respect to light in a wavelength range of about 100 nm to about 1000 nm may be about 1.0 to about 1.5
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3A~3B
AI summary
Provided are an amorphous boron nitride film and an anti-reflection coating structure including the amorphous boron nitride film. The amorphous boron nitride film has an amorphous structure including mainly an sp2 hybrid bond. The refractive index is very low such that the film can be used as an anti-reflective hard coat layer.