HUD Cover Pane Antireflection Layout for Windscreen Glare
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Solution Overview
Problem
Existing windscreen display systems, particularly those with head-up displays, suffer from incomplete suppression of ambient light reflections, including double reflections that can blind the driver and impair the visibility of displayed information, due to limitations in geometric antireflection treatments and restricted installation space.
Innovation Solution
The implementation of an antireflective layer on both sides of the cover pane, combined with a geometric antireflection treatment using a mirror bank or louvered grill, to suppress ambient light reflections, particularly those occurring via double reflections, by absorbing or attenuating light on the inside and outside surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projection device is lowered to avoid blocking the windscreen base display, then installation space is optimized, but the cover pane may still block the beam path
Solution Approach 1:
The patent resolves the spatial conflict by transitioning from a two-dimensional planar arrangement to a three-dimensional configuration. The cover pane is designed with specific curvature and angular orientation that allows it to coexist with both the projection device and windscreen base display without mutual blockage, utilizing vertical and angular dimensions to optimize the layout.
2Object-affected harmful factors
If geometric antireflection treatment is applied to the cover pane, then some ambient light is suppressed, but reflection suppression is incomplete and driver blinding persists
Solution Approach 1:
The patent employs a composite optical structure combining the cover pane with a light absorbing surface (mirror bank). This composite system integrates reflective and absorptive properties in a coordinated manner, where the cover pane reflects light at specific angles while the light absorbing surface captures stray reflections, achieving comprehensive reflection suppression that neither component could achieve alone.
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
This approach reduces ambient light reflections by up to 99.8%, significantly improving visibility by minimizing glare and ensuring clear perception of both head-up and windscreen base display information.
Implementation Method 1
The implementation of an antireflective layer on both sides of the cover pane, combined with a geometric antireflection treatment using a mirror bank or louvered grill, to suppress ambient light reflections
Implementation Method 2
an antireflective layer applied on one side or both sides
Implementation Method 3
a reflective and curved cover pane, which reflects incident ambient light in the direction of a light absorbing surface, also called a mirror bank
Data Source
AI summary
A windscreen display system for a motor vehicle has a head-up display device. The head-up display device has a projection device for emitting a projection light beam with a first item of image information towards a display region of a windscreen so that the information is reflected there and can be perceived in an eye region, and a transparent covering for protecting the projection device, the covering having a cover pane and an antireflection layer applied to one or both sides.