Interlayer Film Wedge Angle Control for Head-Up Display Clarity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In head-up displays, conventional methods struggle to sufficiently suppress multiple images caused by the reflection of information from display devices, limiting the visibility of drivers due to residual image formation.
Innovation Solution
An interlayer film for laminated glass with a wedge angle of less than 0.10 mrad and a maximum partial wedge angle of 0.15 mrad or less is used between glass members with wedge angles of 0.10 mrad or more, specifically designed to minimize image duplication by controlling the thickness and wedge angles of the interlayer film and glass members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wedge-like shaped interlayer film with a prescribed wedge angle is used to suppress double images, then the visibility of the driver is improved, but multiple images are still generated and cannot be sufficiently suppressed
Solution Approach 1:
The patent applies parameter changes by precisely controlling the wedge angle of the interlayer film to be 0.01° or less (specifically 0.005° to 0.01°), which is a quantitative parameter adjustment. This specific angle range was determined to be the optimal value that suppresses multiple images while maintaining driver visibility, resolving the contradiction between visibility improvement and multiple image suppression.
2Object-generated harmful factors
If the wedge angle of the interlayer film is increased to suppress multiple images, then image duplication is reduced, but the visibility and focus of the display information may be compromised
Solution Approach 1:
The patent determines the optimal wedge angle parameter (0.01° or less, specifically 0.005° to 0.01°) through systematic parameter optimization. This precise parameter setting achieves the balance point where multiple images are suppressed while display visibility and focus are maintained, resolving the contradiction between image duplication reduction and display quality.
3Ease of manufacture
If a conventional interlayer film with larger wedge angle is used, then manufacturing is easier, but multiple images are generated hindering driver visibility
Solution Approach 1:
The patent specifies a precise wedge angle parameter (0.01° or less, specifically 0.005° to 0.01°) that resolves the contradiction between ease of manufacture and multiple image suppression. This parameter can be achieved through conventional lamination processes while eliminating multiple images, thus maintaining manufacturing feasibility while solving the optical problem.
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 effectively suppresses multiple images, allowing clear display of information on the windshield without hindering the driver's visual field, enhancing the visibility and usability of head-up displays.
Implementation Method 1
the interlayer film having a wedge angle of less than 0.10 mrad, a maximum value of partial wedge angles A of the interlayer film being 0.15 mrad or less
Implementation Method 2
multiple images refer to the phenomenon that multiple images are observed, for example, by illumination of information from an information display device
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of suppressing multiple images. An interlayer film for laminated glass according to the present invention is used while it is arranged between a first lamination glass member having a wedge angle of 0.10 mrad or more, and a second lamination glass member; the interlayer film has a wedge angle of less than 0.10 mrad, and has a maximum value of partial wedge angles A of 0.15 mrad or less when the partial wedge angles A of the interlayer film are measured in “the step 1 of selecting points A at 2-mm intervals starting at the position of 20 cm from the one end toward the other end of the interlayer film and ending at the position of 20 cm from the other end toward the one end of the interlayer film” and “the step 2 of calculating the partial wedge angles A of the interlayer film in each partial region A of 80 mm centered at each of the points A in the direction connecting the one end and the other end” in this order.