Vehicle Head-Up Display Color Temperature Control for Visibility
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Solution Overview
Problem
The visibility of information displayed by head-up display devices is compromised when the image light superimposed on the irradiation light from headlamps, as both typically use white light, making it difficult for drivers to distinguish the virtual image from the landscape, and variable light distribution patterns can further overlap and obscure the display.
Innovation Solution
Adjusting the correlated color temperature of the white light emitted by the head-up display device to differ significantly from that of the headlamp's irradiation light, ensuring a clear color tone difference that enhances visibility, with options to adjust the color temperature based on the headlamp's settings and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the head-up display device uses white light for image light, then the display can be bright and visible, but the image light becomes protective coloration of the irradiation light and becomes difficult to see
Solution Approach 1:
The patent applies color changes by adjusting the correlated color temperature of the white light emitted by the head-up display device to differ significantly from that of the headlamp's irradiation light. Specifically, when the headlamp is in high beam mode, the head-up display adjusts its color temperature to create a distinct color tone difference, making the image light visible against the bright white irradiation light background
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the correlated color temperature parameter of the head-up display's light source based on the headlamp's operating state. The control unit modifies the color temperature parameter in response to headlamp switching signals, enabling the display to adapt its visual characteristics to different lighting conditions and maintain visibility
2Adaptability or versatility
If the headlamp uses variable light distribution patterns, then the headlamp can adapt to different driving conditions, but the irradiation light and display may overlap and affect visibility
Solution Approach 1:
The patent implements feedback by having the control unit receive switching signals from the headlamp control system and adjust the head-up display's correlated color temperature in response. This feedback mechanism ensures that the display adapts to the headlamp's variable light distribution patterns, maintaining visibility by creating color contrast when the headlamp is active and using standard white light when the headlamp is not active
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
This solution allows drivers to easily recognize information displayed by the head-up display device while maintaining the visibility provided by the headlamp, reducing eye fatigue and ensuring both lights' advantages are utilized effectively.
Implementation Method 1
a light source that emits white light and whose correlated color temperature can be adjusted
Implementation Method 2
a projection unit that projects the white light emitted from the light source as image light
Data Source
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AI summary
This head-up display device is provided in a vehicle together with a head lamp. The head-up display device comprises a light source, a control unit and a projection unit. The light source outputs white light with a variable correlated colour temperature. The control unit adjusts the correlated colour temperature of the white light output from the light source. The projection unit forms image light by means of the white light output from the light source. The projection unit projects the image light onto a member to be projected onto, which is positioned in front of a driver of the vehicle, and thereby displays a virtual image superimposed on the view of said driver. The control unit adjusts the correlated colour temperature of the white light output from the light source, depending on the correlated colour temperature of emission light output from the head lamp.