HUD Glazing With Narrow-Band Filters for Ghost and Solar Control
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Solution Overview
Problem
Existing head-up-display (HUD) systems in automobiles suffer from secondary images or ghosting, which are difficult to eliminate without using wedged interlayers, and also face issues with solar ray-induced heat build-up.
Innovation Solution
A display system with a glazing comprising transparent rigid substrates and an interlayer, equipped with narrow-band absorbers and reflectors that selectively absorb and reflect light at discrete wavelength ranges, including near-infrared, to reduce secondary images and block solar rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wedged PVB interlayers are used to align primary and secondary images, then secondary image ghosting is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the optical parameters of the interlayer by incorporating narrow-band absorbers that selectively absorb light at specific wavelengths corresponding to the secondary image wavelengths. This allows suppression of secondary images without requiring the complex wedged geometry, thus reducing manufacturing complexity while maintaining reliability
Solution Approach 2:
The patent uses composite materials by combining the PVB interlayer with narrow-band absorber particles or dyes. This composite structure provides both the adhesive function of PVB and the selective light absorption function of the narrow-band absorbers, achieving secondary image suppression without wedging complexity
2Ease of manufacture
If conventional glass laminates are used, then manufacturing is simple, but solar heat build-up occurs
Solution Approach 1:
The patent incorporates near-infrared reflectors into the glass laminate structure, creating a composite material that maintains the simplicity of lamination while adding solar heat rejection capability. The near-infrared reflectors are integrated into existing laminate layers without requiring complex additional processing
Solution Approach 2:
The patent changes the spectral reflection parameters of the glass laminate by adding near-infrared reflectors that selectively reflect solar heat wavelengths while maintaining visibility in the visible spectrum. This allows the laminate to remain easy to manufacture while gaining thermal control functionality
3Reliability
If narrow-band absorbers and reflectors are added to the glazing, then secondary images and heat build-up are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent designs the interlayer and laminate structures to serve multiple functions simultaneously: the narrow-band absorbers suppress secondary images, the near-infrared reflectors block solar heat, and the overall structure maintains HUD compatibility. This multi-functionality is achieved within existing manufacturing frameworks, minimizing the increase in manufacturing complexity
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 system effectively minimizes secondary images and reduces heat build-up by aligning primary and secondary images, while maintaining HUD compatibility and providing solar control.
Implementation Method 1
one or more narrow-band absorbers, disposed in a vision area of the glazing, that selectively absorb light within at least one of the three discrete wavelength ranges
Implementation Method 2
one or more narrow-band reflectors, disposed in the vision area of the glazing, that selectively reflect light within at least one of the three discrete wavelength ranges
Implementation Method 3
at least one of the narrow-band reflectors exhibits both a narrow secondary reflection in the visible range and a primary reflection in the near-infrared range
Implementation Method 4
block solar rays that can contribute to heat build-up in automobiles
Implementation Method 5
it encounters a significant change in refractive index that causes part of the image intensity (light) to be reflected off the surface
Data Source
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AI summary
A display system for displaying information is disclosed, the display system comprising a glazing that includes a first transparent rigid substrate, a second transparent rigid substrate, and an interlayer positioned between the first and the second transparent rigid substrates; a projector that emits light toward the glazing at three discrete wavelength ranges in the visible spectrum; and at least three narrow band rejectors, disposed in a vision area of the glazing, that selectively reject light within the three wavelength ranges emitted by the projector.