Optical Absorber for Reducing Glare in Semi-Transparent Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for reducing glare in partially transparent media, such as windows and lenses, are ineffective due to variability with incident angle, polarization, and wavelength, and are mechanically fragile, impractical for large substrates, and fail to account for human visual psychophysics and dynamic range.
Innovation Solution
Incorporating an optical absorber into semi-transparent materials that absorbs more light in the blue-violet spectrum (380-450 nm) than in the visible spectrum (500-700 nm), reducing the ratio of glare intensity to primary image intensity, while maintaining luminous transmission and minimizing color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-reflection coatings are applied to reduce glare, then reflected and transmitted glare images are reduced, but the coatings are mechanically fragile, require expensive equipment for deposition, and are impractical for large substrates
Solution Approach 1:
The patent extracts the glare-reducing function from surface coatings and implements it through bulk optical absorption. Instead of applying fragile thin-film coatings to the surface, the invention incorporates absorbing materials directly into the bulk of the transparent element, eliminating the need for complex coating deposition processes while achieving glare reduction through selective wavelength absorption.
Solution Approach 2:
The patent changes the optical parameters of the transparent material by incorporating absorbing substances that selectively absorb specific wavelengths. This modifies the transmission characteristics of the material itself, allowing glare reduction through the material's bulk properties rather than through surface coatings, thereby simplifying manufacturing.
2Object-affected harmful factors
If anti-reflection coatings are applied to reduce glare, then glare is reduced, but the coatings' efficacy varies with incident angle, polarization, and wavelength
Solution Approach 1:
The patent applies local quality by making the absorption property inherent to the bulk material rather than a surface treatment. The absorbing material is distributed throughout the transparent element, providing consistent glare reduction regardless of incident angle or polarization, because the absorption occurs throughout the volume of material that the light traverses.
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
Significantly reduces both actual and perceived glare intensity and spatial extent, improving visibility and image quality by selectively absorbing glare-causing wavelengths without significantly attenuating the primary image, and maintaining color accuracy.
Implementation Method 1
an optical absorber disposed in the semi-transparent material having greater absorption for optical wavelengths between approximately 380 nm and approximately 450 nm than for optical wavelengths between approximately 500 nm and 700 nm
Implementation Method 2
a device through which or from which an object is viewed, the device comprising semi-transparent material
Implementation Method 3
a proportion of the incident light is reflected at each air-device interface according to Fresnel's equations
Implementation Method 4
whose refractive index differs from the surrounding medium
Data Source
AI summary
Partially transparent devices and methods that reduce actual and/or perceived glare by incorporating absorbing materials are described. Actual and/or perceived glare can be reduced by multi-path absorption in the device. Perceived glare is further reduced by accounting for the psychophysics of human visual perception as a function of wavelength, orientation, and field illuminance.