Laminated Glass Interlayer Film With Zoned Wedge Control for HUD Ghosting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional interlayer films for laminated glass struggle to effectively suppress double images in head-up displays, as controlling the wedge angle alone is insufficient to prevent image duplication.
Innovation Solution
An interlayer film with a specific thickness gradient, where the thickness increases from one end to the other, is used, with three regions having controlled wedge angles, ensuring an absolute difference of 0.05 mrad or less between partial wedge angles, and containing thermoplastic resin and plasticizer for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge-like shaped interlayer film with a prescribed wedge angle is used, then double images can be suppressed and visibility can be improved, but it is difficult to sufficiently suppress double images because only controlling the wedge angle is insufficient
Solution Approach 1:
The patent applies local quality by dividing the display region into three equal partial regions and specifying different wedge angle requirements for each region. The first partial region has a wedge angle of 0.02-0.06 mrad, the second has 0.04-0.08 mrad, and the third has 0.06-0.10 mrad. This regional differentiation allows precise control of light reflection at different positions, sufficiently suppressing double images while maintaining manufacturing feasibility through clear local specifications.
2Reliability
If the wedge angle of the interlayer film is increased to suppress double images, then visibility improves, but the complexity of controlling the wedge angle uniformly across the entire film increases
Solution Approach 1:
The patent segments the display region into three equal partial regions along the width direction and assigns different wedge angle ranges to each segment. This segmentation transforms the complex problem of uniform wedge angle control into three simpler, independent control zones with specific angle requirements, reducing overall control complexity while achieving superior double image suppression.
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
Significantly suppresses double images in laminated glass by maintaining precise wedge angle control across the film, improving visibility for drivers in head-up displays.
Implementation Method 1
a wedge-like shaped interlayer film having a prescribed wedge angle is sandwiched between a pair of glass plates... by the adjustment of the wedge angle of the interlayer film, a display of measured information reflected by one glass plate and a display of measured information reflected by another glass plate can be focused into one point
Data Source
AI summary
Provided is an interlayer film for laminated glass with which double images in laminated glass can be significantly suppressed. The interlayer film for laminated glass according to the present invention is an interlayer film for use in a laminated glass that is a head-up display, the interlayer film has one end, and the other end being at the opposite side of the one end, the other end has a thickness larger than a thickness of the one end, the interlayer film has a region for display corresponding to a display region of the head-up display, and when three regions obtained by equally dividing the region for display into three in a direction connecting the one end and the other end are named a first partial region for display, a second partial region for display, and a third partial region for display in sequence from the one end side, as to partial wedge angle Ax, Bx, and Cx in the first, second, and third partial regions for display, and partial wedge angle φx in the region for display satisfy, |Ax−φx| is 0.05 mrad or less, |Bx−φx| is 0.05 mrad or less, and |Cx−φx| is 0.05 mrad or less.