Vehicle Windshield Reflection Portions for HUD View Preservation
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Solution Overview
Problem
Existing projection type display devices cannot display images on transparent windows within vehicle compartments without obstructing the view of occupants.
Innovation Solution
A projection type display device with reflection portions arranged on the window, where each portion is less than 2 mm wide and separated by an interval equal to or greater than its width, allowing image projection while maintaining an unobstructed view by aligning with the human pupil diameter and ensuring minimal visual disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If image light is projected onto a transparent window, then image display function is achieved, but the view through the window is obstructed
Solution Approach 1:
The window surface is segmented into multiple discrete reflection portions (20) arranged in an array. Each reflection portion is a separate element with specific dimensional constraints (lateral width ≤2mm, lateral interval ≥ lateral width). This segmentation allows the window to simultaneously provide image display areas and transparent viewing areas, resolving the contradiction between image display and view obstruction.
2Illumination intensity
If reflection portions are made wider to improve image display quality, then image brightness is improved, but the obstruction to the view increases
Solution Approach 1:
The lateral width of each reflection portion is constrained to be equal to or less than 2 mm, which corresponds to the minimum human pupil diameter. This parameter optimization ensures that while the reflection portions are sufficient to reflect image light into the viewer's pupil for adequate image brightness, they occupy minimal visual space and do not significantly obstruct the overall view through the window.
3Area of stationary object
If reflection portions are arranged closer together to increase display area, then image display coverage is improved, but the view through the window is more obstructed
Solution Approach 1:
The window is divided into multiple discrete reflection portions arranged in an array pattern. This segmentation strategy maximizes the distribution of reflective elements across the window surface to provide adequate image display coverage, while the discrete nature of the segments ensures that gaps remain between them for unobstructed viewing.
Solution Approach 2:
Different regions of the window serve different functions: reflection portions provide image display capability while the intervals between them maintain transparent viewing capability. This local differentiation of function allows the window to simultaneously achieve image display coverage and view preservation.
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
Enables image display on transparent windows without obstructing the view of vehicle occupants, ensuring clear visibility through the window by using reflection portions that match the minimum human pupil diameter dimensions.
Implementation Method 1
a plurality of reflection portions arranged on the window and reflecting a light
Data Source
AI summary
A projection type display device configured to display an image on a window while also providing a view through the window. The projection type display device has a plurality of reflection portions arranged on a windshield for reflecting an image light that is projected from an image projection device and displaying a superposed display image onto the windshield. Further, since (i) the plurality of reflection portions are arranged on the window along a lateral direction with a lateral interval interposed at positions between two reflection portions, (ii) a lateral width of each of the plurality of reflection portions is less than the minimum human pupil diameter, and (iii) the lateral interval between the two reflection portions is equal to or greater than the lateral width of the reflection portion, the view of the vehicle occupant through the windshield is also sufficiently ensured.