Head-up Display Light Transmitting Sheet Asymmetric Check Window
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The visibility of virtual images in head-up displays is reduced due to the reflection of external light by the check window portion, which is intended to visually check the adhesion state of the light transmitting sheet.
Innovation Solution
A head-up display design with a light transmitting sheet that includes emission windows and a light shielding frame, where the check window portion is strategically sized and positioned to minimize external light reflection, and the windshield is curved to direct display light in a way that reduces visibility obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check window portion is provided in the light transmitting sheet to visually check the adhesion state, then the adhesion state can be grasped, but external light is reflected by the check window portion and the visibility of the virtual image is reduced
Solution Approach 1:
The light transmitting sheet is designed with different transparency characteristics in different regions: the check window portion maintains transparency for visual inspection, while the emission window portion has optimized transparency to minimize external light reflection. This local differentiation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
The patent employs asymmetric design in the arrangement and sizing of check window portions relative to the emission window portion. The check window is positioned and dimensioned to provide adequate adhesion verification while occupying minimal area that could reflect external light into the viewer's line of sight.
2Strength
If the light transmitting sheet is fixed to the case with adhesive, then the light transmitting sheet is securely attached, but the adhesive may not be visually confirmed without a check window
Solution Approach 1:
The check window portion is extracted as a distinct transparent region within the light transmitting sheet, specifically positioned to allow visual inspection of the adhesive application state. This separation enables independent optimization of the adhesive bonding function and the visual inspection function.
Solution Approach 2:
The check window portion serves as an intermediary that allows visual access to the adhesive application state without interfering with the adhesive bonding function. It mediates between the need for secure attachment and the need for visual confirmation of adhesion quality.
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 enhances visibility by reducing external light reflection, ensuring that the virtual image remains clear and distinct for the viewer.
Implementation Method 1
a light transmitting sheet that covers the opening portion and is fixed to the case with an adhesive
Implementation Method 2
when the external light is reflected by the check window portion, the reflected light of the external light other than the display light is visually recognized by the viewer
Data Source
AI summary
[Problem] To provide a head-up display excellent in visibility. A light transmitting sheet 60 has an emission window portion 63 that has a pair of left and right sides 63L and 63R and a pair of front and rear sides 63Fr and 63Re, and is a region from which the display light is emitted, a light shielding frame portion 64 that is at least partially fixed to a case 52 and is an opaque region, and a check window portion 65 formed along the pair of left and right sides 63L and 63R and the pair of front and rear sides 63Fr and 63Re within the light shielding frame portion 64 and allowing visual recognition of presence or absence of the adhesive disposed between the case 52 and the light transmitting sheet 60. A check window 65L and 65R along the pair of left and right sides 63L and 63R or a check window 65Fr and 65Re along the pair of front and rear sides 63Fr and 63Re is such that the check window along one side has a smaller area than the check window along the other side of the pair.