Variable Transmittance Glass Control for Vehicle Glare Shielding
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Solution Overview
Problem
Conventional methods for mitigating strong light interference in vehicles, such as rotatable sunshades and sunscreen films, are inadequate in effectively blocking glare from various directions and compromise the spacious experience of glass roofs and sunroofs.
Innovation Solution
Implementing variable transmittance glass that adjusts its transmittance based on the elevation and yaw angles of light sources, using sensors and cameras to determine the light source's orientation and position, and adjusting the transmittance of specific areas of the glass to block glare effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotatable sunshade is used to block strong light, then driving security is improved, but the blocking range is insufficient and may block the driver's sight
Solution Approach 1:
The patent divides the glass surface into multiple independently controllable regions (e.g., driver side, passenger side, different height zones). Each region can be adjusted separately based on the light source position, allowing precise blocking without obstructing the driver's view. The control system segments the glass into zones that can be independently dimmed or tinted.
Solution Approach 2:
The patent implements dynamic adjustment of glass transmittance based on real-time detection of light source position, elevation angle, and yaw angle. The system continuously monitors environmental conditions and adjusts the glass properties accordingly, transitioning from static to dynamic control to adapt to changing lighting conditions and vehicle orientations.
2Object-affected harmful factors
If a sunscreen film is attached to glass roof or panoramic sunroof, then sun protection is improved, but the spacious experience is compromised
Solution Approach 1:
The patent uses dynamically adjustable glass with variable transmittance that can switch between transparent and opaque states based on lighting conditions. This eliminates the need for permanent sunscreen films, maintaining the spacious appearance during normal conditions while providing sun protection when needed. The glass properties change in real-time rather than being fixed.
Solution Approach 2:
The patent changes the optical parameters of the glass (transmittance, absorption) based on detected light conditions. By adjusting parameters such as elevation angle and yaw angle of the light source, the system modifies the glass properties to provide sun protection only in necessary areas and conditions, preserving the spacious experience when strong light is not present.
3Measurement precision
If variable transmittance glass adjusts transmittance based on light source angles, then light shielding precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms (such as rotatable sunshades or manual controls) with electronic control systems that use sensors and algorithms to automatically adjust glass transmittance. This substitution reduces mechanical complexity while improving precision through electronic sensing and control of the variable transmittance glass properties.
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 provides precise light shielding, enhancing driving safety and passenger comfort by accurately controlling the transmittance of variable transmittance glass to block strong light sources, thereby reducing glare and improving the overall riding experience.
Implementation Method 1
adjusting transmittance of the projection area on the variable transmittance glass
Data Source
AI summary
Embodiments of this application provide a method for controlling variable transmittance glass. The method includes: obtaining an elevation angle and a yaw angle of a light source, where the elevation angle indicates an included angle between a direction in which light of the light source is emitted to the target vehicle and a horizontal plane, and the yaw angle indicates an included angle between a connection line between a projection of the light source on the horizontal plane and a centroid of the target vehicle, and a driving direction of the target vehicle; obtaining location information of a target object; obtaining a projection area projected by the target object on the variable transmittance glass based on the location information of the target object, and the elevation angle and the yaw angle of the light source, where the target object is located in the target vehicle.