Light Field Display Module for Head-Up Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-up displays suffer from visual focus fatigue due to fixed and monotonous virtual images, which do not change at different viewing angles, limiting their application and causing driver distraction and fatigue during high-speed driving.
Innovation Solution
A light field display module comprising a light field display layer, an adjustment layer, and an image forming layer, where the image forming layer with multiple optical micro-structures changes the direction of the light field image beam, allowing the light field image to change position and provide stereoscopic depth information viewable from different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat virtual image is displayed at a fixed focal length in head-up display, then the driver's eyes do not need to shift to the dashboard, but visual focus fatigue still occurs and the display content is monotonous
Solution Approach 1:
The patent applies the dynamics principle by making the virtual image position adjustable rather than fixed. The image can be dynamically positioned at different depths along the optical path, allowing the driver's visual focus to naturally adjust between near and far points, thereby preventing visual focus fatigue while maintaining driving safety.
Solution Approach 2:
The patent changes the focal length parameter of the virtual image from a fixed value to a variable parameter. By adjusting the focal length between different ranges (e.g., 1m to 5m), the system provides diverse viewing experiences and prevents monotony while ensuring the image remains in a safe viewing zone for the driver.
2Adaptability or versatility
If the virtual image position is fixed, then the display structure is simple, but the image does not change at different viewing angles and application diversity is limited
Solution Approach 1:
The patent segments the optical path into multiple adjustable regions, allowing different portions of the light field to be independently controlled. This enables the virtual image to be positioned at different depths and angles, providing adaptability for various applications (e.g., different dashboard displays, navigation, warnings) without requiring completely different display systems.
Solution Approach 2:
The patent creates a universal display system that can serve multiple functions through a single adjustable optical structure. The same light field display device can present information at different virtual distances and viewing angles, making it adaptable for various driving scenarios and information types without increasing overall system 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
The light field display module reduces visual focus fatigue by providing images with stereoscopic depth information that change with viewing angles, enhancing display diversity and adaptability to various applications, including vehicle-mounted displays, while maintaining safety and reducing driver fatigue.
Implementation Method 1
The image forming layer has multiple optical micro-structures and is configured to change a direction of the light field image beam to change a position of the light field image
Implementation Method 2
The image forming layer has a partially transparent and partially reflective film
Data Source
AI summary
A light field display module including a light field display layer, an adjustment layer, and an image forming layer is provided. The light field display layer is configured to form a light field image beam. The adjustment layer is disposed on a path of the light field image beam, and configured to adjust the light field image beam. The image forming layer is disposed on the path of the light field image beam from the adjustment layer, and configured to change a position of a light field image by changing a direction of the light field image beam. The image forming layer has multiple optical micro-structures.