Inorganic Wire-Grid Polarizer for HUD Heat Dissipation
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Solution Overview
Problem
Conventional wire-grid polarization elements used in head-up displays suffer from insufficient heat resistance and heat dissipation properties, leading to issues like stray light and warping due to high temperatures, and are costly to manufacture, making them unsuitable for mass production.
Innovation Solution
A polarization element using a transparent inorganic substrate with a grid structural body and optical functional layer formed by nanoimprinting, which includes a base portion and protruding portions, enhancing heat dissipation and maintaining excellent polarization properties while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire-grid polarization element is used in a head-up display, then polarization properties are improved, but heat resistance and heat dissipation properties deteriorate
Solution Approach 1:
The patent changes the material parameter of the substrate from conventional resin to transparent inorganic material (such as glass), which fundamentally alters the thermal properties while maintaining optical functionality. This material substitution enables the polarization element to withstand high temperatures and dissipate heat effectively, resolving the heat resistance issue while preserving polarization performance
Solution Approach 2:
The patent employs a composite structure combining transparent inorganic substrate material with metal wire grids and dielectric layers. This composite approach leverages the high thermal conductivity of inorganic materials and metals while maintaining the polarization function through the wire-grid structure, achieving both thermal management and optical performance
2Reliability
If a wire-grid polarization element is used in a head-up display, then polarization properties are improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the wire-grid structure from its conventional resin substrate context and relocates it to a transparent inorganic substrate. This extraction and relocation enables the use of more cost-effective manufacturing processes for inorganic substrates, reducing overall manufacturing cost while maintaining the essential polarization function of the wire-grid structure
Solution Approach 2:
The patent adopts transparent inorganic materials that can be manufactured using established, cost-effective processes. The inorganic substrate approach allows for more economical mass production compared to conventional resin-based wire-grid polarizers, making the technology suitable for widespread automotive application
3Reliability
If conventional wire-grid polarization element is used, then polarization function is achieved, but heat dissipation property deteriorates
Solution Approach 1:
The patent fundamentally changes the thermal parameter of the substrate by transitioning from resin to transparent inorganic material. This material parameter change dramatically improves thermal conductivity and heat dissipation capability, allowing the polarization element to effectively manage heat generated during operation while maintaining its polarization function
Solution Approach 2:
The transparent inorganic substrate acts as a thermal intermediary, conducting heat away from the wire-grid structure and dissipating it throughout the element. This intermediary inorganic layer facilitates efficient heat transfer pathways that were absent in conventional resin-based designs, improving overall heat dissipation 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 solution provides a polarization element with improved heat resistance and heat dissipation properties, enabling cost-effective mass production and maintaining high polarization performance, suitable for head-up displays in vehicles.
Implementation Method 1
the wire-grid polarization element is configured so as to reflect most of light of an electric field vector component oscillating in parallel to the conductive wires, while permitting most of light of an electric field vector component perpendicular to the conductive wires to pass through
Implementation Method 2
A polarization element using a transparent inorganic substrate with a grid structural body and optical functional layer formed by nanoimprinting, which includes a base portion and protruding portions, enhancing heat dissipation
Data Source
AI summary
To provide a polarization element having good polarization properties and excellent in heat dissipation property and manufacturing costs. In order to solve the above problem, a polarization element 1 of the present disclosure includes a substrate 10 made of a transparent inorganic material; a grid structural body 20 which is made of a transparent material, and includes a base portion 21 provided along a surface of the substrate 10 and protruding portions 22 protruding from the base portion 21 in a grid; and an optical functional layer 30 which is formed on the protruding portions 22, and includes an absorptive layer for absorbing light, a reflective layer for reflecting light, or a multilayer having at least the absorptive layer and the reflective layer.