Head-Up Display Viewpoint Detection Using Antiglare Plate Reflection
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Solution Overview
Problem
Existing head-up display (HUD) systems face challenges in accurately detecting the driver's viewpoint due to the placement of the viewpoint detection camera, which can obstruct the driver's view and capture images at undesirable angles, leading to reduced accuracy in viewpoint detection.
Innovation Solution
The HUD system includes a camera positioned outside the housing and oriented to capture a nearly horizontal image of the driver's face reflected on an antiglare plate, allowing for accurate viewpoint detection and adjusting the emission direction of the virtual image light to improve display positioning without obstructing the driver's view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the viewpoint detection camera is placed on the dashboard or near the ceiling, then the driver's view is not obstructed, but the accuracy of viewpoint detection is reduced due to capturing images at undesirable angles
Solution Approach 1:
The patent introduces an antiglare plate as an intermediary reflective surface. Instead of placing the camera to directly face the driver (which would obstruct the view) or angle it from dashboard/ceiling positions (which reduces detection accuracy), the camera captures the driver's face image reflected off the antiglare plate. This reflective intermediary enables the camera to be positioned without obstructing the driver's view while still capturing a front-facing image for accurate viewpoint detection.
2Measurement precision
If the camera is placed in front of the driver to capture a front image, then viewpoint detection accuracy is improved, but the driver's front view is obstructed
Solution Approach 1:
The antiglare plate serves as a reflective intermediary that allows the camera to capture a front image of the driver without being positioned directly in front of the driver's line of sight. The camera can be mounted on the dashboard or ceiling, angled to capture the reflection of the driver's face on the antiglare plate, thereby maintaining both detection accuracy and unobstructed driver view.
Solution Approach 2:
The patent utilizes the reflective dimension of the antiglare plate to create an indirect imaging path. Instead of the camera directly facing the driver in a straight line, the optical path is bent through reflection, allowing the camera to be positioned in a different spatial dimension (on dashboard or ceiling) while still capturing the necessary facial image for viewpoint detection.
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 configuration enhances the accuracy of viewpoint detection and allows for precise control of virtual image display positioning, improving visibility and reducing the number of components needed for sunlight monitoring, while maintaining unobstructed driver vision.
Implementation Method 1
an antiglare plate that covers the housing opening and transmits the image light
Implementation Method 2
capturing an image of an area where a face including an eye of the driver is reflected on the antiglare plate
Data Source
AI summary
A head-up display comprises an image display device, a virtual image optical system, a housing with a housing opening, an antiglare plate covering the housing opening, a camera for capturing an image of a face area including an eye of a driver, a viewpoint detection device for detecting a viewpoint of the driver based on the image captured by the camera, and a main controller. The camera is installed on a position outside the housing and withdrawn from an optical path of the image light emitted through the housing opening, as well as in an orientation for capturing an image of an area where a face including the eye of the driver is reflected on the antiglare plate. The main controller controls to adjust an emission direction of the image light based on a viewpoint position of the driver detected by the viewpoint detection device.