Vehicle Window Glass Optics for In-Car Display Visibility
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Solution Overview
Problem
Existing vehicle window glasses with integrated displays face challenges in improving the visibility of images displayed from the inside of the vehicle.
Innovation Solution
The vehicle window glass system is designed with specific visible light transmittance and luminance relationships, where T ≤ 0.1 × L, to enhance the visibility of displays by optimizing the glass and interlayer film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the visible light transmittance of the glass member is increased to improve outside visibility, then the visibility of the display from inside the vehicle deteriorates due to increased glare and secondary images
Solution Approach 1:
The patent applies local quality by making the interlayer film have different optical properties at different locations. Specifically, the interlayer film has a first region with different light transmittance characteristics than a second region, allowing the display area to have optimized light transmittance for display visibility while other areas maintain higher transmittance for outside visibility. This spatial variation in optical properties resolves the contradiction between outside visibility and display visibility.
Solution Approach 2:
The patent uses a composite structure consisting of a glass member and an interlayer film with specific optical properties. The interlayer film is designed with controlled light transmittance characteristics that differ from the glass member, creating a composite system where the overall optical performance balances outside visibility and display visibility. The composite material approach allows independent optimization of each layer's properties to resolve the visual contradiction.
2Loss of information
If the visible light transmittance of the glass member is decreased to improve display visibility, then the visibility of the outside scenery from inside the vehicle deteriorates
Solution Approach 1:
The interlayer film is designed with spatially varying optical properties where different regions have different light transmittance characteristics. The region corresponding to the display area has optimized transmittance for display visibility, while other regions maintain higher transmittance for outside scenery visibility. This local differentiation resolves the contradiction by allowing each region to be optimized for its specific function.
3Adaptability or versatility
If a transparent screen film is sealed in the laminated glass to create a display, then the visibility of the displayed image deteriorates due to glare and secondary images
Solution Approach 1:
The patent employs a composite material system where the interlayer film serves dual functions: it seals the transparent screen film (enabling display integration) and simultaneously controls light transmittance to reduce glare and secondary images (improving image visibility). The interlayer film's specific optical properties allow it to function as both a sealing medium and an optical control layer, resolving the contradiction between display integration and image visibility.
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 configuration improves the visibility of images displayed on the vehicle window glass by reducing glare and secondary images, while maintaining sufficient light transmittance for clear viewing.
Implementation Method 1
the visible light transmittance T [%] of the vehicle window glass at the portion including the display
Implementation Method 2
light flux projected from a projection device forms an image on the transparent screen film and is visibly displayed as an image to an observer on the projection device side
Data Source
AI summary
To improve the visibility of an image displayed on a display from the inside of a vehicle, in a vehicle window glass having the display.The vehicle window glass has a glass member and a display mounted on said glass member, wherein the visible light transmittance T [%] of said vehicle window glass at the portion including said display and the luminance L [cd/m2] of the display satisfy T≤0.1×L.