Compound Glazing Waveplate for Sunglasses-Compatible HUD Brightness
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Solution Overview
Problem
Existing head-up display systems face issues with image visibility in bright conditions and compatibility with polarization-selective sunglasses, requiring high power consumption and inadequate brightness.
Innovation Solution
A composite disk with a λ/4 delay plate, a reflective layer, and an opaque masking layer is used to enhance image visibility by converting s-polarized light to p-polarized light, ensuring clear projection even with sunglasses, while reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a larger display device is used to ensure sufficient power and brightness in sunlight, then image visibility is improved, but device complexity and power consumption increase
Solution Approach 1:
A λ/4 retarder plate is introduced as an intermediary optical element between the display device and the windshield. This plate converts s-polarized light from the display into p-polarized light, which is then reflected more efficiently by the windshield's reflective structure, enhancing image brightness without requiring a larger display device
Solution Approach 2:
The patent changes the polarization parameter of the light by using a λ/4 retarder plate to convert s-polarized light to p-polarized light. This parameter change enables more efficient reflection from the windshield's reflective structure, improving image brightness while maintaining the same display device size
2Ease of manufacture
If s-polarized light is used for projection, then the windshield's reflective properties are utilized, but visibility through polarization-selective sunglasses is lost
Solution Approach 1:
The patent changes the polarization parameter of the projected light from s-polarized to p-polarized using a λ/4 retarder plate. This enables the light to be reflected effectively by the windshield's reflective structure while remaining visible through polarization-selective sunglasses that transmit p-polarized light
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 clear and energy-efficient image projection in bright conditions, compatible with polarization-selective sunglasses, by utilizing a composite disk with a λ/4 delay plate and reflective layer to convert light polarization effectively.
Implementation Method 1
a λ/4 delay plate (8) connected to the inner surface (IV) of the inner pane (6)
Implementation Method 2
a reflective layer (4) arranged at least in the projection area (B) between the outer pane (2) and the inner pane (6)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a composite panel (1) with a projection region (B) and a main viewing region (H), at least comprising an outer panel (2), at least one thermoplastic intermediate layer (3), a reflective layer (4), an opaque masking layer (5), an inner panel (6), an adhesive layer (7) and a λ/4-waveplate (8), wherein the at least one thermoplastic intermediate layer (3) is arranged between the outer panel (2) and the inner panel (6), the projection region (B) is arranged outside the main viewing region (H), the reflective layer (4) is arranged at least in the projection region (B) between the outer panel (2) and the inner panel (6), the opaque masking layer (5) is arranged at least in the projection region (B) between the outer panel (2) and the inner panel (6) and, when looking through the composite panel (1) from the interior-side surface (IV), the inner panel (2) is arranged spatially behind the reflective layer (4), the λ/4-waveplate (8) is connected to the interior-side surface (IV) of the inner panel (6) via the adhesive layer (7) and is arranged in a region of the composite panel (1) which, when looking in a perpendicular direction through the composite panel (1), lies entirely in the region in which the opaque masking layer (5) is arranged, and, when looking in the perpendicular direction through the composite panel (1), the projection region (B) lies entirely in the region of the composite panel (1) in which the λ/4-waveplate (8) is arranged.