Vehicle Display Reflectance Control for Rearview Glare Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices for vehicles face challenges in providing clear rearview visibility, especially at high speeds, due to the reflection of light from the rearview mirror and the visibility of control circuits, and are affected by environmental brightness changes.
Innovation Solution
A display device with a reflectance control unit that adjusts its reflectance based on vehicle speed and reverse information, using a configuration with a first and second part to optimize visibility and reduce glare, allowing the driver to switch between viewing an image on a display or a mirror image, while minimizing the visibility of the control circuit and adapting to environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reflectance control device uses a single uniform reflectance setting, then the structure is simple, but the visibility and glare reduction performance deteriorate at different vehicle speeds
Solution Approach 1:
The reflectance control device is divided into a first region (overlapping the display surface) and a second region (surrounding the first region), with each region independently controllable. This segmentation allows different reflectance settings for different areas, optimizing rearview visibility while managing glare at various vehicle speeds without requiring complete system redesign.
Solution Approach 2:
The reflectance control device dynamically adjusts its reflectance characteristics based on vehicle speed and reverse information. The control circuit modifies the reflectance of the first and/or second regions in real-time according to driving conditions, enabling the system to adapt to changing environmental requirements rather than maintaining a fixed state.
2Object-affected harmful factors
If the reflectance is increased to reduce glare at high speeds, then glare reduction improves, but the visibility of the display surface deteriorates
Solution Approach 1:
By separating the reflectance control into distinct first and second regions, the system can apply high reflectance to the second region for glare reduction while maintaining lower reflectance in the first region to preserve display visibility when needed, resolving the contradiction between glare reduction and display visibility.
Solution Approach 2:
Different regions of the reflectance control device are assigned different reflectance characteristics based on their functional requirements. The first region (overlapping the display) can maintain lower reflectance for display visibility, while the second region (surrounding area) can have higher reflectance for glare reduction, allowing each local area to optimize its specific function.
3Ease of manufacture
If the control circuit is made visible for debugging purposes, then ease of debugging improves, but the appearance and driver distraction worsen
Solution Approach 1:
The reflectance control device can dynamically adjust its reflectance state based on operational mode. During normal operation, it maintains appearance-optimized settings with appropriate reflectance levels. During debugging or maintenance modes, the control circuit can be made more visible or accessible without affecting normal driving conditions, as the system can switch between operational states.
4Area of stationary object
If the reflectance control device covers the entire display surface, then glare reduction coverage improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The reflectance control device is implemented as a segmented structure with a first region overlapping the display surface and a second region surrounding it. This segmentation allows the device to achieve comprehensive glare reduction coverage through the combined effect of both regions while simplifying manufacturing compared to a fully integrated uniform structure, as each region can be independently optimized and assembled.
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 rearview visibility by reducing glare and improving image clarity, especially at high speeds, and maintains a favorable appearance by minimizing the visibility of the control circuit and frame, while adapting to changing environmental conditions.
Implementation Method 1
a reflectance control device positioned on the display surface side of the display and configured to change a reflectance for incident light
Data Source
AI summary
A display device installed in a vehicle includes a display, a reflectance control device, and a control circuit. The reflectance control device is capable of changing a reflectance for incident light. The control circuit controls the reflectance of the reflectance control device. The reflectance control device includes a first part and a second part. The first part is positioned in a first region overlapping the display surface when viewed in a normal direction being normal to the display surface. The second part is positioned in a second region surrounding the first region when viewed in the normal direction of the display surface. The control circuit controls a reflectance of the second part based on at least one of speed information indicating a speed of the vehicle and reverse information indicating whether the vehicle is reversing.