Laminated Glass Interlayer Wedge Profile for HUD Double-Image Suppression
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Solution Overview
Problem
Conventional laminated glass interlayer films struggle to simultaneously suppress double images at both the lower and upper ends of a head-up display (HUD) as the driver's gaze direction varies, especially with enlarged display areas.
Innovation Solution
An interlayer film for laminated glass with specific thickness and wedge angle profiles, featuring regions with controlled increases in thickness and wedge angles, ensuring uniformity and continuity from one end to the other, is employed to suppress double images effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wedge-shaped interlayer film is used, then double images can be suppressed at one position, but double images cannot be simultaneously suppressed at both lower and upper ends of the HUD display area
Solution Approach 1:
The interlayer film is designed with spatially varying wedge angles, where different regions of the film have different wedge angle characteristics. Specifically, the wedge angle is optimized for lower end display areas in one region and for upper end display areas in another region, allowing each region to address double images locally while the entire film covers the full display area.
Solution Approach 2:
The interlayer film is divided into multiple regions with different wedge angle profiles. The film includes a first region optimized for suppressing double images at lower end display areas and a second region optimized for suppressing double images at upper end display areas, effectively segmenting the problem into manageable zones.
2Area of stationary object
If the display area of the HUD is enlarged, then more information can be displayed, but double image suppression becomes more difficult
Solution Approach 1:
As the display area is enlarged, the interlayer film compensates by implementing local quality variations through spatially dependent wedge angles. Different portions of the enlarged display area are addressed by appropriately optimized regions of the interlayer film, maintaining double image suppression performance across the entire expanded area.
Solution Approach 2:
The solution extends from considering a single wedge angle to a two-dimensional wedge angle distribution across the interlayer film surface. This dimensional approach allows the film to address double images across an enlarged display area by varying the wedge angle characteristics in both horizontal and vertical directions.
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 effectively suppresses double images at both ends of the HUD display area, enhancing visibility by ensuring that displayed information is not doubly observed, particularly at both ends and across the entire display region.
Implementation Method 1
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 the other glass plate can be focused into one point
Data Source
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AI summary
There is provided an interlayer film for laminated glass with which double images can be effectively suppressed. The interlayer film for laminated glass according to the present invention has one end and the other end thicker in thickness than the one end, and has a region where the thickness is increased in a direction from one end side to the other end side and has a portion where the amount of increase in the thickness is increased in the direction from one end side to the other end side in the region where the thickness is increased, or has a region where the sectional shape in the thickness direction is a wedge-like shape and has a portion where the wedge angle is increased in a direction from one end side to the other end side in the region where the sectional shape in the thickness direction is a wedge-like shape.