Head-Up Display Opening Cover with Reflectance Gradient
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Solution Overview
Problem
Conventional head-up display apparatuses cause horizontal separation of virtual images due to parallax, leading to discomfort for drivers when observing the foreground and display images simultaneously.
Innovation Solution
A head-up display apparatus with a display source inside the instrument panel, an opening for emitting display light, and an opening cover with a change in color or reflectance from the inner to the outer sides, reducing the visibility of peripheral image separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the opening cover has uniform color and reflectance, then the manufacturing is simple, but the horizontal separation of virtual image is clearly visible causing driver discomfort
Solution Approach 1:
The opening cover is designed with non-uniform color or reflectance distribution, where the peripheral portions have different optical properties compared to the central portion. This local variation in quality causes the peripheral portions to be less clearly imaged, thereby reducing the visible horizontal separation of the virtual image and improving driver comfort without requiring complex manufacturing processes
2Manufacturing precision
If the opening cover peripheral portions are clearly imaged, then the manufacturing precision is high, but the horizontal separation due to parallax becomes noticeable and troublesome
Solution Approach 1:
The opening cover incorporates local quality variations where peripheral portions have reduced imaging clarity compared to the central portion. This is achieved through non-uniform color or reflectance distribution, which causes the peripheral portions to appear less distinct and reduces the harmful horizontal separation effect caused by parallax, thereby eliminating driver discomfort
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 reduces the discomfort caused by horizontal separation of virtual images by blurring the peripheral portions of the virtual image, allowing drivers to view the foreground and display images with less separation and increased clarity.
Implementation Method 1
a reflected image of the opening cover is observed as being separated in the horizontal direction due to parallax of the eyes
Implementation Method 2
at horizontal ends of the opening cover, a change in color or reflectance is provided from the opening side towards an outer side
Data Source
AI summary
A head-up display apparatus reduces the trouble caused by horizontal separation of a display image. The head-up display apparatus (1) includes a display source (2) inside an instrument panel (6), an opening (7) on the instrument panel (6), display light from the display source (2) being emitted through the opening (7), and an opening cover (5) provided around the opening (7). At horizontal ends (51, 53) of the opening cover (5), a change in color or reflectance is provided from the opening sides (52a, 54a) towards the outer sides (52b, 54b).