Vehicular Heads-Up Display Diffusing Means for Sunlight Reflection
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Solution Overview
Problem
Vehicular heads-up display devices suffer from sunlight-induced reflection of internal components as a background on the windshield, leading to low driver awareness and misidentification of alarm signs due to external light interference.
Innovation Solution
Incorporation of a diffusing means, such as a diffusing sheet or grain finish, on the back surface of a semi-permeable cover with a dark color tone between the light source and the cover, which diffuses outside light and prevents internal component reflection on the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a semi-permeable cover is used to allow light transmission, then the virtual image visibility is improved, but sunlight enters the unit case and causes reflection of internal components as a background on the windshield
Solution Approach 1:
A diffusing sheet is introduced as an intermediary layer between the semi-permeable cover and the light source. This diffusing sheet scatters incoming sunlight, preventing direct illumination of internal components while still allowing the required light transmission for virtual image display. The diffusing sheet acts as a mediator that transforms direct sunlight into scattered light, eliminating the harmful reflection effect.
Solution Approach 2:
The interior surface of the semi-permeable cover is modified with a grain finish in specific areas where sunlight reflection occurs. This creates local quality changes on the inner surface, causing scattered reflection of sunlight away from the windshield while maintaining overall light transmission properties. The grain finish is applied selectively to problematic reflection zones.
2Use of energy by moving object
If alarm signs are displayed only when needed (e.g., low fuel), then energy consumption is reduced, but driver awareness and recognition rate decrease
Solution Approach 1:
The alarm sign is designed to change color or brightness characteristics when activated. By creating a distinct visual contrast between the alarm sign and the background, even brief alarm notifications become highly noticeable to the driver. The color change principle ensures that energy-efficient intermittent display does not compromise driver awareness.
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
Enhances display quality by eliminating the reflection of internal components as a background on the windshield, improving the visibility and clarity of virtual images displayed to the driver.
Implementation Method 1
a diffusing means configured to diffuse the outside light incident on and entering the unit case through the semi-permeable cover
Implementation Method 2
a semi-permeable cover disposed on the opening
Implementation Method 3
cause the outgoing light emitted from the light source to go out to the outside of the unit case via the opening provided in the unit case, and to reflect on a windshield of the vehicle as a reflecting member
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
Provided is a vehicular heads-up display device with which it is possible to avoid burn-in of an internal component upon a reflecting member by exterior light, improving display quality. A vehicular heads-up display device, comprising a case body (50) whereon an aperture part (51c) is disposed and a light-emitting body (30) that is housed within the case body (50) reflects emitted light L that is emitted by the light-emitting body (30) externally to the case body (50) via the aperture part (51c) and reflects said emitted light L from the windshield (13), causing the driver (14) to have sight of the virtual image V that is obtained by said reflection. The vehicular heads-up display device further comprises a semi-transmissible cover (55) installed in the aperture part (51c), and a dispersal means (58) is disposed between the light emitting body (30) and the cover (55), for dispersing exterior light that enters the case body (50) via the cover (55).