Vehicle Display Polarization Control for Polarized Sunglasses Detection
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Solution Overview
Problem
Drivers wearing polarized sunglasses face difficulty in seeing virtual images displayed by vehicle display devices like head-up displays due to reduced visibility, necessitating a method to detect polarized sunglasses for improved visibility.
Innovation Solution
A vehicle display device equipped with a camera, a polarizer disposed to convert incident light into linearly polarized light, and a control unit that determines polarized sunglasses wear by analyzing luminance values in face images, adjusting the polarization direction to orthogonal to the vertical direction, and comparing current and past luminance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a driver wears polarized sunglasses, then the driver's comfort and glare reduction are improved, but the visibility of the virtual display image deteriorates
Solution Approach 1:
The system changes the polarization parameters of the display light dynamically. When polarized sunglasses are detected, the display device adjusts the polarization angle and luminance of the virtual image to ensure visibility through the sunglasses while maintaining glare reduction benefits.
Solution Approach 2:
The system uses a camera to detect whether the driver is wearing polarized sunglasses and provides feedback to the control unit. Based on this feedback, the display device automatically adjusts its polarization parameters to maintain visibility.
2Illumination intensity
If the luminance of the display image is increased to improve visibility for drivers wearing polarized sunglasses, then the visibility is improved, but the energy consumption increases
Solution Approach 1:
Instead of continuously increasing luminance, the system applies partial action by only adjusting polarization parameters when polarized sunglasses are detected. The luminance increase is applied selectively and minimally to achieve visibility without excessive energy consumption.
Solution Approach 2:
The system changes polarization parameters (angle and luminance) dynamically based on detection results. When polarized sunglasses are detected, the display adjusts its parameters; when not detected, it operates at normal settings, optimizing energy consumption.
3Illumination intensity
If the polarization angle of the display light is changed to improve visibility through polarized sunglasses, then the visibility is improved, but the device complexity increases
Solution Approach 1:
The display device is designed to perform multiple functions: normal display operation and adaptive polarization adjustment. By integrating the polarization control into the existing display system, the invention achieves multi-functionality without requiring a completely separate system.
Solution Approach 2:
The system adjusts polarization parameters (angle and luminance) of the existing display light rather than requiring additional hardware. This parameter-based approach maintains visibility improvement while minimizing device complexity.
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
Facilitates easy detection of polarized sunglasses wear, allowing for increased display image luminance or polarization angle adjustment to enhance visibility.
Implementation Method 1
a polarizer that is disposed in front of a lens of the camera, converts incident light into linearly polarized light, and emits the light toward the camera
Data Source
AI summary
A vehicle display device that can easily determine the driver's state of wearing polarized sunglasses is provided. A vehicle display device includes a polarizer that is disposed in front of a lens of a camera that continuously acquires face images of a driver P so that a polarization direction becomes a horizontal direction that is orthogonal to a vertical direction. In the vehicle display device, a control unit calculates a luminance value corresponding to each face image, and causes a storage unit to store the calculated luminance values therein as the luminance value information in association with a time series. The control unit then compares the current luminance value information with the past luminance value information in a plurality of pieces of luminance value information stored in the storage unit and when the current luminance value information decreases, determines that the driver puts on the polarized sunglasses.