Composite Windshield Reflective Layers for Dual Display Brightness
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Solution Overview
Problem
Existing head-up display (HUD) systems face a compromise in achieving high image intensity in both the transmission and masking areas of windshields, as reflective layers used for HUDs reduce light transmission, and optimizing reflectance for the masking area where light transmission is irrelevant leads to suboptimal image intensity.
Innovation Solution
A laminated glass pane with separate reflective layers in the HUD and secondary display areas, where the reflective layer in the secondary display area has a higher reflectance than in the HUD area, ensuring high light transmission in the viewing area while enhancing the intensity of the secondary display image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective layer is used in the masking area to enhance display intensity, then the image intensity in the masking area is improved, but the light transmission in the viewing area is reduced
Solution Approach 1:
The windshield is divided into two distinct display areas (masking area and viewing area), each equipped with its own separately optimized reflective layer. This segmentation allows independent optimization of reflectance for each area without compromising the other, resolving the contradiction between enhancing masking area display intensity and maintaining viewing area light transmission.
Solution Approach 2:
Different reflective layers with different reflectance properties are applied to different locations on the windshield. The masking area receives a reflective layer with higher reflectance (50-90%) optimized for display intensity, while the viewing area receives a reflective layer with lower reflectance (10-30%) optimized for light transmission. This local differentiation resolves the contradiction by tailoring optical properties to specific functional requirements of each area.
2Device complexity
If a single reflective layer is used for both HUD and masking area displays, then the device complexity is reduced, but the image intensity in the masking area is insufficient
Solution Approach 1:
Instead of using a single reflective layer for both display areas, the invention segments the reflective layer into two separate layers with different optical properties. The first reflective layer serves the HUD area with optimized reflectance for that function, while the second reflective layer serves the masking area with higher reflectance for enhanced display intensity. This segmentation resolves the contradiction by allowing each layer to be optimized for its specific function.
Solution Approach 2:
The invention applies different reflective layer configurations to different locations: a first reflective layer with specific reflectance properties for the HUD area and a second reflective layer with different reflectance properties for the masking area. This local quality differentiation enables the masking area to achieve sufficient image intensity while the HUD area maintains its display quality, resolving the contradiction between device simplicity and display performance.
3Illumination intensity
If the reflectance of the reflective layer is increased to improve display intensity, then the image intensity is improved, but the light transmission through the windshield is reduced
Solution Approach 1:
The invention applies the local quality principle by assigning different reflectance values to different spatial locations on the windshield. The masking area is equipped with a reflective layer having high reflectance (50-90%) to maximize display image intensity, while the viewing area is equipped with a reflective layer having low reflectance (10-30%) to minimize impact on light transmission. This spatial differentiation of optical properties resolves the contradiction between enhancing display intensity and maintaining light transmission.
Solution Approach 2:
The windshield's reflective layer is segmented into two distinct layers with different optical characteristics. The first reflective layer is optimized for the HUD area with lower reflectance to preserve light transmission, while the second reflective layer is optimized for the masking area with higher reflectance to enhance display intensity. This segmentation allows the system to achieve high display intensity where needed without sacrificing overall light transmission 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 improved image intensity in the masking area without significantly reducing light transmission in the viewing area, allowing for clearer and more aesthetically pleasing displays in both areas.
Implementation Method 1
a reflective layer in a HUD area located in the viewing area and a reflective layer in a secondary display area located in the masking area. The reflective layers are designed to reflect radiation from the at least one imaging unit to generate a display image
Implementation Method 2
The laminated glass pane comprises an outer pane and an inner pane, which are bonded together via a thermoplastic intermediate layer
Data Source
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AI summary
The invention relates to a projection assembly, at least comprising a composite pane (10), comprising an outer pane (1) and an inner pane (2), which are connected to one another via a thermoplastic intermediate layer (3), with an opaque masking region (M) and a transparent viewing region (D); and at least one imaging unit (P.1, P.2) directed onto a HUD region (B) arranged in the viewing region (D) and onto a secondary display region (S) arranged in the masking region (M); wherein the composite pane (10) is provided with a respective reflective layer (4-B, 4-S) in the HUD region (B) and in the secondary display region (S), which are suited for reflecting the radiation of the at least one imaging unit (P.1, P.2) to generate a display image; and the reflective layer (4-S) in the secondary display region (S) has a higher degree of reflectance relative to the radiation of the at least one imaging unit (P.1, P.2) than the reflective layer (4-B) in the HUD region (B).