Vehicle Window Projection Brightness Control for HUD Contrast
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Solution Overview
Problem
Existing head-up display systems for vehicles project image data onto a vehicle window, causing contrast issues due to ambient brightness changes, leading to a fatiguing viewing experience for the driver as the focus alternates between the projected image and the environment behind it.
Innovation Solution
A device comprising an interface, image data processing unit, brightness sensor, and projection unit, which adjusts the gradation curve based on ambient brightness to lighten dark image areas, ensuring that the image data maintains optimal visibility and reduces eye strain by minimizing the impact of ambient brightness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If image data is projected onto a transparent vehicle windshield, then navigation and vehicle operating data become visible to the driver, but the transparency of the windshield causes the background environment to be visible through dark image areas, creating contrast issues and driver distraction
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the brightness and contrast parameters of the projected image based on ambient lighting conditions. The system modifies the luminance values of dark image areas to compensate for the transparency effect, ensuring that the projected information remains clearly visible without causing excessive contrast that would distract the driver.
Solution Approach 2:
The system implements dynamics by continuously adapting the projection parameters in real-time according to changing ambient light conditions. The brightness and contrast settings are not fixed but are dynamically adjusted to maintain optimal visibility while minimizing driver distraction throughout different driving environments.
2Illumination intensity
If the projection surface is made transparent to allow driver visibility, then the windshield remains see-through, but dark image areas become semi-transparent, allowing the background environment to be visible and reducing image contrast
Solution Approach 1:
The patent uses parameter changes by adjusting the brightness and contrast parameters of the projected image based on ambient lighting conditions. The system modifies the luminance values of dark image areas to compensate for the transparency effect, ensuring that the projected information remains clearly visible without causing excessive contrast that would distract the driver.
3Loss of information
If ambient brightness increases during daytime driving, then the projected image becomes less visible due to reduced contrast, but increasing projection brightness may cause glare and further distraction
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the brightness and contrast parameters of the projected image based on ambient lighting conditions. The system modifies the luminance values of dark image areas to compensate for the transparency effect, ensuring that the projected information remains clearly visible without causing excessive contrast that would distract the driver.
Solution Approach 2:
The system implements feedback by continuously monitoring ambient light conditions and using this information to adjust the projection parameters. The brightness and contrast settings are automatically modified based on real-time environmental measurements, ensuring optimal visibility while preventing glare and driver distraction.
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 provides a fatigue-free viewing experience by dynamically adjusting image brightness to match ambient conditions, thereby reducing driver distraction and improving overall visibility of projected image data.
Implementation Method 1
a brightness sensor (103) connected to the image data processing unit (102) for detecting an ambient brightness H(t)
Implementation Method 2
a projector projects image content onto the projection surface using light beams. The light beams are reflected by the projection surface toward the viewer
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device and a method for projecting image data onto a projection surface of a vehicle window of a vehicle. The proposed device comprises: an interface (101) for providing the image data BD1(t); an image data processing unit (102), connected to the interface (101), for generating image data BD2(t) from the image data BD1(t); a brightness sensor (103), connected to the image data processing unit (102), for detecting an ambient brightness H(t); a projection unit (104), connected to the image processing unit (102), for projecting the image data BD2(t) onto the projection surface of the vehicle window; wherein the image data processing unit (102) is designed and configured such that a gradation curve GK(H(t)) is specified, according to the detected ambient brightness H(t), for the generation of the image data BD2(t) from the image data BD1(t) such that dark image regions which fall below a predefined colour brightness limit value in comparison with image regions lying above the colour brightness limit value are brightened in terms of their colour spectra or greyscale spectra in the image data BD2(t) relative to the image data BD1(t), wherein a measure of the brightening of the dark image regions in the image data BD2(t) increases with increasing ambient brightness H(t).