Composite Windshield Reflection Layers for Dual-Region HUD Displays

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Solution Overview

Problem

Existing head-up display (HUD) systems face challenges in achieving optimal intensity for display images in both the see-through and masking regions of windshields, due to the limitations of reflection layers in balancing light transmission and reflectance.

Innovation Solution

A projection arrangement with a composite pane featuring different reflection layers in the HUD and secondary display regions, where the reflection layer in the secondary display region has a higher reflectance than in the HUD region, optimizing image intensity without compromising light transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflection layer with high reflectance is used in the masking region to increase display image intensity, then the intensity of the secondary display image is improved, but the light transmission of the see-through region is reduced

Engineering Contradiction:

Improveintensity of secondary display imageVSAvoidlight transmission of see-through region

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent applies different reflection layer configurations to different regions of the windshield: the HUD region uses a first reflection layer with lower reflectance to maintain light transmission, while the masking region uses a second reflection layer with higher reflectance to maximize display intensity. This spatial differentiation of optical properties resolves the contradiction between display intensity and light transmission.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The windshield is divided into functionally distinct regions (HUD region and masking region) with independently optimized reflection layers. The HUD region prioritizes transparency for driver visibility, while the masking region prioritizes reflectance for display quality, eliminating the need to compromise either function.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If a reflection layer is used in the HUD region to enable HUD display, then the HUD display function is achieved, but the light transmission of the see-through region is reduced

Engineering Contradiction:

ImproveHUD display functionVSAvoidlight transmission of see-through region

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The first reflection layer in the HUD region is specifically designed with moderate reflectance properties that enable HUD functionality while preserving sufficient light transmission for driver visibility. This localized optimization allows the HUD region to fulfill its display function without significantly compromising the see-through capability.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the same reflection layer is used in both HUD and masking regions, then the device complexity is reduced, but the display image intensity in the masking region is not optimal

Engineering Contradiction:

Improvereflection layer configurationVSAvoidintensity of secondary display image

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

Different reflection layer configurations are applied to different regions: the first reflection layer for HUD and the second reflection layer for masking region display. This localized differentiation optimizes display intensity in each region without significantly increasing overall device complexity, as both layers can be integrated into the windshield structure.

Inventive Principle:

Principle #3Local quality

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 significantly enhances the intensity of the secondary display image while maintaining high light transmission in the see-through region, improving visibility and aesthetic appeal for drivers.

Implementation Method 1

a reflection layer in each case in the HUD region and in the secondary display region, wherein the reflection layers are suitable for reflecting the radiation of the at least one imaging unit to generate a display image

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

light transmission of the see-through region

Methodology Applied

Scientific EffectLight transmission: Refraction

Data Source

PatentUS20250060586A1Projection arrangement with two display regions on a composite pane

Publication Date: 2025.02.20 SAINT GOBAIN SEKURIT FRANCE

AI summary

A projection arrangement with a composite pane having an outer pane and an inner pane, which are connected to one another via a thermoplastic intermediate layer. The composite pain has an opaque masking region and a transparent see-through region. The project arrangement also has at least one imaging unit, which is directed at a head-up display (HUD) region arranged in the see-through region and at a secondary display region arranged in the opaque masking region. The composite pane is equipped in the HUD region and in the secondary display region in each case with a reflection layer, which are suitable for reflecting the radiation of the at least one imaging unit to generate a display image. The reflection layer in the secondary display region has a higher reflectance with respect to the radiation of the at least one imaging unit than the reflection layer in the HUD region.