Vehicle Glazing Pane Layering for HUD Reflection and Solar Control

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Solution Overview

Problem

Existing reflective coatings for p-polarized light on glazing panes face challenges in achieving optimal reflection with efficient solar control while maintaining cost-effectiveness and ease of implementation, and often suffer from issues like wrinkles, waviness, and lower scratch resistance.

Innovation Solution

A glazing pane design incorporating a reflective film with a solar control film positioned between the reflective film and the outer surface, utilizing transparent liquid crystal or polymeric interference layers for high reflectivity and solar control, respectively, to reduce ghost images and enhance thermal comfort.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflective coating for p-polarized light is applied on the glazing pane surface, then the reflection of p-polarized light is improved (above 10% reflectance), but the solar control performance deteriorates

Engineering Contradiction:

Improvep-polarized light reflectanceVSAvoidsolar control performance

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The invention divides the glazing pane into multiple functional layers: a first glazing pane with a reflective coating for p-polarized light, and a second glazing pane with a solar control coating. This segmentation allows each layer to perform its specific function independently - the first layer reflects p-polarized light for HUD visibility while the second layer controls solar heat transmission, resolving the contradiction between reflection performance and solar control.

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If a reflective foil is used instead of PVD coating, then the p-polarized light reflectance is improved, but the manufacturing complexity and cost increase

Engineering Contradiction:

Improvep-polarized light reflectanceVSAvoidmanufacturing complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The invention replaces the mechanical assembly of separate reflective foil and glazing pane with an integrated multi-layer structure where the reflective coating is directly deposited onto the first glazing pane using PVD technology. This substitution eliminates the need for separate foil application, lamination, and alignment processes, thereby reducing manufacturing complexity while maintaining high p-polarized light reflectance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Illumination intensity

If a reflective coating is applied, then the p-polarized light reflection is improved, but the scratch resistance deteriorates

Engineering Contradiction:

Improvep-polarized light reflectanceVSAvoidscratch resistance

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The invention creates a composite structure where a hard, scratch-resistant coating is applied over the reflective coating on the first glazing pane. This composite material approach protects the delicate reflective layer from scratches and mechanical damage while preserving its optical properties for p-polarized light reflection.

Inventive Principle:

Principle #40Composite materials

4Illumination intensity

If a reflective coating is applied, then the p-polarized light reflection is improved, but the appearance quality deteriorates due to wrinkles and waviness

Engineering Contradiction:

Improvep-polarized light reflectanceVSAvoidappearance quality

Core Design Contradiction:

Illumination intensityVSShape

Solution Approach 1:

The invention replaces the use of flexible reflective foils that are prone to wrinkles and waviness with a rigid glazing pane that has a reflective coating directly deposited onto its surface. This substitution eliminates the appearance quality issues associated with foil application while maintaining the desired p-polarized light reflection performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 high reflectivity for p-polarized light with efficient solar control, reducing ghost images and maintaining thermal comfort, while being cost-effective and easy to implement, with options for transparent or obscurated areas on the glazing pane.

Implementation Method 1

the reflective film itself provides for high reflectivity of p-polarized light

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

The solar control film absorbs a part of the light coming from the projector such that the reflection level is reduced at the external interface and consequently, the level of ghost or double image is reduced

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 3

utilizing transparent liquid crystal or polymeric interference layers for high reflectivity

Methodology Applied

Scientific EffectInterference: Interference

Data Source

PatentEP4703134A1Glazing pane

Publication Date: 2026.03.04 AGC GLASS EUROPE SA

Figure 1~2
Figure 3

AI summary

The invention relates to a glazing pane separating an interior space from an exterior environment comprising a reflective film and a solar control film, to a HUD system comprising said glazing pane and to the use of the pane in a vehicle, providing for a solution for optimal reflection of p-polarized light together with efficient solar control at a cost effective manner and easy to implement.