Optical Compensation Plate with Antireflection Layer
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Solution Overview
Problem
Optical compensation plates used in liquid crystal projectors are prone to image deterioration due to adhesion of dust and dirt, especially when a dielectric multilayer film is formed on oblique deposition films, leading to reduced contrast performance.
Innovation Solution
An optical compensation plate comprising a phase difference compensation layer formed by oblique vapor deposition of an inorganic material, an antireflection layer with a mesh-porous structure similar to a moth-eye structure, and an intermediate layer with dense films, which improves adhesion and prevents dust and dirt adhesion, using materials like zinc oxide for the antireflection layer and magnesium fluoride for an oil-resistant coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dielectric multilayer film is formed on an oblique deposition film to create an optical compensation plate, then antireflection characteristics are improved, but the plate becomes charged with electricity and easily adsorbs dust and dirt
Solution Approach 1:
A resin layer is introduced as an intermediary between the oblique deposition film and the dielectric multilayer film. This resin layer prevents direct contact between the two layers, thereby preventing electricity charging of the oblique deposition film while maintaining the antireflection function of the dielectric multilayer film.
Solution Approach 2:
A resin coating layer is applied as a thin film over the dielectric multilayer film. This flexible thin film provides a smooth, non-charging surface that prevents dust and dirt adhesion while allowing the underlying dielectric multilayer film to maintain its antireflection characteristics.
2Manufacturing precision
If dust and dirt attach to the surface of the optical compensation plate, then the display image quality decreases and contrast performance deteriorates
Solution Approach 1:
The resin layer acts as a mediator that prevents the oblique deposition film from charging, thereby preventing dust and dirt adhesion that would otherwise degrade display image quality and contrast performance.
Solution Approach 2:
The resin coating layer forms a protective thin film that creates a smooth surface resistant to dust and dirt adhesion, thereby maintaining high display image quality and contrast performance throughout the device's operational life.
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 effectively prevents image degradation by reducing dust and dirt adhesion, enhancing durability and manufacturing suitability for severe environments, and improving dust-proof performance compared to conventional designs.
Implementation Method 1
The phase difference compensation layer is formed by oblique vapor deposition of an inorganic material on a surface of a substrate
Implementation Method 2
The antireflection layer is provided on the upper side of the phase difference compensation layer, and has an uneven structure by a mesh-porous structure equally formed on one surface
Data Source
AI summary
An optical compensation plate comprises a substrate, a phase difference compensation layer, and an antireflection layer. The substrate is for example a glass substrate. The phase difference compensation layer is formed by oblique vapor deposition of an inorganic material on a surface of the substrate, and has a microstructure where columnar structures stand with inclination in relation to the surface of the substrate. The antireflection layer is provided on the upper side of the phase difference compensation layer, and has an uneven structure equally formed on one surface.