Wire-Grid Polarizer Dashboard Panel Reduces Veiling Glare
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Solution Overview
Problem
Veiling glare in automotive vehicles, caused by mirror-like images of the dashboard reflected onto the windshield, reduces the contrast of the road scene and existing solutions either reduce brightness or limit color options.
Innovation Solution
A brightly colored dashboard panel with a wire-grid polarizer that reflects P-polarized light and transmits S-polarized light, using a substrate, absorption layer, and wire-grid polarizer with metallic gratings and a thin film layer to selectively reflect P-polarized light and absorb S-polarized light, maintaining panel brightness while reducing veiling glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an absorbing polarizing layer is mounted on top of a reflecting layer to reduce veiling glare, then veiling glare is reduced, but the brightness of the panel is reduced
Solution Approach 1:
The invention divides the panel into distinct functional layers: a wire-grid polarizer layer that selectively reflects P-polarized light and transmits S-polarized light, and a brightly colored substrate layer. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between glare reduction and brightness maintenance.
Solution Approach 2:
The wire-grid polarizer is positioned specifically at the interface where veiling glare occurs (the top surface of the panel), while the brightly colored substrate provides the desired visual appearance. This local application of the polarizing function allows glare reduction without compromising the overall brightness and color of the panel.
2Object-affected harmful factors
If a darkly colored panel is used to reduce veiling glare, then veiling glare is reduced, but the color brightness and variety are limited
Solution Approach 1:
The invention separates the glare-reduction function (performed by the wire-grid polarizer) from the color-display function (performed by the brightly colored substrate). This allows the substrate to be any bright color without compromising glare reduction, as the polarizer handles the glare independently of the substrate's color properties.
Solution Approach 2:
The wire-grid polarizer changes the polarization state of reflected light, selectively reflecting P-polarized light while transmitting S-polarized light. This parameter change in light polarization allows the panel to maintain bright colors while reducing veiling glare, as the polarizer's optical property rather than the substrate's color determines glare reduction.
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
Effectively reduces veiling glare by selectively reflecting P-polarized light while transmitting S-polarized light, maintaining the brightness and color of the dashboard panel, thus improving visibility for the driver.
Implementation Method 1
A wire-grid polarizer configured to reflect P-polarized light and transmit S-polarized light
Implementation Method 2
the reflectivity of P-polarized lights is much lower than that of S-polarized lights at the air-glass boundary by calculating the Fresnel reflection coefficients
Implementation Method 3
The absorption layer is configured to absorb S-polarized light and P-polarized light
Implementation Method 4
The thin film layer is configured to modify the reflectivity spectrum of the metal grating by generating a resonance when coupled to the gratings
Data Source
AI summary
A wire-grip polarizer (“WGP”), and a panel having said WGP is provided. The WGP is mounted on an absorption layer. The absorption layer is mounted on a substrate. The substrate is brightly colored. The WGP includes a plurality of gratings formed of a metallic element. Each of the gratings is spaced apart from the other so as to form a waveguide. The WGP is configured to transmit S-Polarized light and reflect P-polarized light. The A thin film layer may be disposed on each of the metallic gratings. The thin film layer is configured to generate a resonance so as to modify the reflectivity of P-polarized light so as to reduce veiling glare and maintain the brightness of the substrate.