Vehicle Rear-View Holographic Display for Eye-Strain-Free Refocusing
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Solution Overview
Problem
Conventional rear view mirrors in vehicles require a line of sight to the rear and cause visual difficulties and eye strain when replaced with display screens, as drivers must alternate between near and far focal points, affecting viewing experience and safety.
Innovation Solution
A holographic projection system that captures rear view images and displays them as holographic images at a replay plane, with an optical element forming virtual images at a far focal point, allowing drivers to view these images from an eye box region within the vehicle without the need for direct line of sight, similar to conventional mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display screen is used instead of a conventional rear view mirror, then the line of sight requirement is eliminated, but the driver experiences visual difficulties and eye strain due to alternating between near and far focal points
Solution Approach 1:
The patent changes the optical parameters of the display system by using a holographic display to form virtual images at different focal distances. The system dynamically adjusts the focal point of the rear view image to match the driver's viewing distance, eliminating the need for eye refocusing while maintaining the benefits of a screen-based display.
Solution Approach 2:
The holographic display acts as an intermediary between the camera capture and the driver's eye. It creates virtual images that appear at the desired focal distance, mediating the optical path to provide both the flexibility of screen-based display and the viewing comfort of traditional mirrors.
2Ease of manufacture
If a display screen is positioned closer to the driver than the front view, then rear view images can be displayed, but the driver must alternately focus between near and far distances causing eye strain
Solution Approach 1:
The system changes the focal distance parameter of the displayed image using holographic optical processing. By forming virtual images at varying focal distances that match the driver's natural viewing position, the system eliminates eye strain while maintaining flexible display positioning within the vehicle.
3Reliability
If conventional rear view mirrors are used, then clear rear view observation is achieved, but direct line of sight to the rear is required
Solution Approach 1:
The patent replaces the mechanical mirror system with a digital imaging system consisting of a rear view camera and holographic display. This substitution eliminates the need for direct line of sight to the rear while maintaining reliable rear view observation, allowing the system to function in situations where traditional mirrors would be ineffective.
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 the viewing experience by eliminating the need for direct line of sight and reducing eye strain, allowing drivers to easily switch between rear and front views without refocusing, while maintaining clear vision for those with eyesight corrections.
Implementation Method 1
an optical element is provided having optical power defining a focal length, wherein the optical element is arranged in front of the replay plane at a distance less than the focal length of the optical element, so that a virtual image of the picture is formed by the optical element
Data Source
AI summary
A system, such as a driver assistance system, arranged to form images of outside a vehicle for viewing from an eye box region within the vehicle. The system comprises an image capture device, a picture generating unit and an optical element. The image capture device is arranged to be mounted to the vehicle. The image capture device is arranged to capture images outside the vehicle. The optical element is disposed in front of the replay plane. The optical element has a focal length. The distance between the replay plane and the optical element is less that the focal length of the optical element such that the optical element forms a virtual image of each picture for viewing from the eye box region. The picture generating unit may be a holographic projector. The holographic projector may be arranged to form pictures on a replay plane. Each picture may correspond to an image captured by the image capture device.