Windshield 3D Image Projection With Eye-Tracked Focal Adjustment
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Solution Overview
Problem
Drivers experience impaired driving stability and increased eye strain when shifting gaze from the external environment to view information on vehicle displays, leading to difficulty in recognizing visual information and reacting to emergencies.
Innovation Solution
An electronic device with first and second light emitting modules and an eye tracker adjusts the focal length between the driver's eyes and displayed images using binocular parallax to provide a 3D image on the vehicle's windshield, maintaining the driver's focus on the external environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the driver shifts gaze to check navigation information or dashboard display, then the driver can obtain visual information, but the driving stability is impaired
Solution Approach 1:
The patent uses the windshield as an intermediary surface to project visual information directly into the driver's field of view. The projection unit displays navigation and vehicle information on the windshield glass, allowing the driver to obtain necessary visual information without shifting gaze from the road, thus maintaining driving stability while reducing information loss
Solution Approach 2:
The patent transitions from traditional 2D dashboard displays to a 3D spatial projection system. By using binocular parallax and adjusting focal lengths for left and right eyes separately, the system creates a three-dimensional virtual image space on the windshield, enabling natural focal point adjustment and eliminating the need for eye focus shifting between distant road and close dashboard displays
2Loss of information
If the driver adjusts eye focus from distant environment to close display device, then the driver can recognize visual information, but eye strain increases
Solution Approach 1:
The patent creates a 3D virtual image projection that appears at various distances in front of the driver's eyes. By adjusting the focal length of the projection and using binocular parallax to create depth perception, the system allows the driver's eyes to remain focused at a comfortable distance while perceiving visual information, eliminating the harmful effect of frequent focus adjustment and reducing eye strain
Solution Approach 2:
The patent dynamically adjusts the focal length parameters of the projection for each eye based on the driver's viewing position and eye characteristics. The eye tracker detects eye position and the projection unit adjusts the focal length and convergence points accordingly, changing the optical parameters to match the driver's natural viewing state, thereby preventing eye strain while ensuring clear visual information recognition
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 reduces eye fatigue and enhances driving stability by providing visual information at the driver's focal point, allowing easy recognition of necessary information without straining the eyes.
Implementation Method 1
a first light emitting module and a second light emitting module configured to emit light to a predetermined position on a screen in front of the user
Implementation Method 2
using light reflected from windshield glass of the vehicle
Implementation Method 3
an eye tracker configured to detect a position of eyes of the user
Implementation Method 4
The first light emitting module and the second light emitting module may be configured to adjust a focal length between the position of eyes of the user detected by the eye tracker and an image identifiable by the user, based on a binocular parallax between a visual object in the first image and a visual object in the second image
Data Source
AI summary
An electronic device includes a first light emitting module, a second light emitting module, a screen configured to provide to a user a first image emitted from the first light emitting module and a second image emitted from the second light emitting module, and an eye tracker configured to detect a position of eyes of the user. The first light emitting module and the second light emitting module are configured to adjust a focal length between the eyes of the user and an image identifiable by the user, corresponding to the position of eyes of the user detected by the eye tracker, based on a binocular parallax between a visual object in the first image and a visual object in the second image.