Transparent Diffuser Structure for Glare Reduction and Optical Clarity
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Solution Overview
Problem
Conventional methods for reducing glare and optical distortion in transparent mediums, such as windows and displays, are inadequate in scattering light effectively, especially when multiple light sources are involved, leading to difficulties in viewing objects clearly.
Innovation Solution
A transparent diffuser structure is designed with a first light source that scatters light to create a distributed source, while remaining transparent to external ambient light, using techniques like edge or front lighting with LEDs, and incorporating optical distortion-reducing layers to minimize optical distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-glare surfaces are applied to scatter reflected light, then glare is reduced, but optical distortion increases and viewing clarity deteriorates
Solution Approach 1:
The patent applies different surface treatments to different regions of the transparent medium. The first surface receives an anti-glare treatment with specific roughness characteristics, while the second surface receives a different treatment or remains smooth. This local differentiation allows glare reduction on the viewer side without introducing significant optical distortion that would affect the entire optical path.
Solution Approach 2:
The patent employs composite surface structures combining multiple materials or treatments. The anti-glare surface may consist of a transparent coating material with specific refractive index and roughness characteristics applied over the base transparent medium. This composite structure optimizes both glare scattering and optical transmission properties.
2Object-affected harmful factors
If light scattering is increased to reduce glare, then glare is reduced, but light transmission efficiency decreases
Solution Approach 1:
The patent carefully controls the parameters of the anti-glare surface, including roughness amplitude (on the order of wavelengths of light), roughness correlation length, and coating thickness. By optimizing these parameters, the surface scatters glare effectively while maintaining high transmission for direct viewing paths. The refractive index of the coating material is also selected to optimize the balance between scattering and transmission.
3Illumination intensity
If a transparent diffuser is used to scatter light from a light source, then glare is reduced and light distribution is improved, but the structure becomes more complex
Solution Approach 1:
The patent combines the anti-glare surface treatment with the transparent diffuser structure into a single integrated component. Rather than adding separate glare-reduction and diffusion elements, the design merges these functions into one element with optimized surface and bulk properties, reducing overall system complexity while achieving both glare reduction and improved light distribution.
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 significantly improves optical transmission metrics by scattering light away from specular angles, reducing glare and distortion, and maintaining high clarity and transparency for external ambient light, making it suitable for various applications including displays and windows.
Implementation Method 1
An exemplary embodiment can scatter, that is, cause deviation from specular ray angles by more than about 1 degree or more than about 10 degrees, more than 1%, more than 5%, more than 10%, or more than 20% of light that is reflected from the structure at a glancing angle or injected into waveguide modes of the structure
Implementation Method 2
Exemplary transparent diffuser structures can result in external ambient transmitted rays having one or more of high optical transmission, high optical clarity in transmission, low optical transmission haze
Data Source
AI summary
A light-transmitting structure comprising a substrate having a plurality of regions where at least two of the plurality of regions have different refractive indices, an optical path length of light transmitted from a first light source through the plurality of regions is substantially constant, and where light transmitted from a second light source into the substrate is scattered by at least one of the plurality of regions.