Laminated Glass Interlayer for Head-Up Display Double Image Suppression
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Solution Overview
Problem
Conventional interlayer films for laminated glass in head-up displays (HUDs) fail to adequately suppress both reflected and transmitted double images, which can hinder driver visibility by displaying information twice, especially in regions above the display area where drivers observe the road.
Innovation Solution
An interlayer film with a specific thickness gradient and wedge angle configuration, where the thickness varies by 32 μm or less over 80 mm and the wedge angle of the non-display region is smaller than the display region's, combined with a thermoplastic resin and plasticizer composition, effectively reduces double image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wedge angle is increased to suppress double images, then double image suppression improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the wedge angles in different regions. The first region has a wedge angle of 0.1-1.0 mrad, the second region has 0.01-0.1 mrad, and the third region has 0.1-1.0 mrad. These controlled parameter variations allow effective double image suppression while maintaining manufacturability through defined tolerance ranges.
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 interlayer film significantly suppresses both reflected and transmitted double images, enhancing driver visibility by ensuring clear information display without duplication, while maintaining high visible light transmittance and adhesive properties.
Implementation Method 1
the interlayer film having one end and the other end on an opposite side of the one end, the other end having a thickness larger than a thickness of the one end, an absolute value of difference between a maximum value of measured values of variation in thickness and a minimum value of measured values of variation in thickness being 32 μm or less when the variation in thickness being measured in a distance of 80 mm centered at points of every 2 mm intervals in a direction connecting the one end and the other end in the region for display from the one end to the other end, and a region of the other end side from the region for display having a wedge angle that is smaller than a wedge angle of the region for display
Data Source
AI summary
Provided is an interlayer film for laminated glass with which both the reflected double images and the transmitted double images can be suppressed in the laminated glass. An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass used for laminated glass that is a head-up display, in which the interlayer film includes a region for display corresponding to a display region of the head-up display, the interlayer film has one end and the other end on the opposite side of the one end, the other end has a thickness larger than a thickness of the one end, an absolute value of difference between a maximum value of measured values of variation in thickness and a minimum value of measured values of variation in thickness is 32 μm or less when the variation in thickness is measured in a distance of 80 mm centered at points of every 2 mm intervals in a direction connecting the one end and the other end in the region for display from the one end to the other end, and a region of the other end side from the region for display has a wedge angle that is smaller than a wedge angle of the region for display.