Vehicle HUD Folded Optical Path Reduces Volume
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional head-up displays (HUDs) in vehicles require additional display screens, occupy large space, and affect the user's field of vision, as they need a large distance between the image source and reflection mirror due to optical characteristics, leading to reduced driving safety and convenience.
Innovation Solution
A vehicle-mounted display device with a light reflection module that reflects image light at least twice, reducing the optical path length and volume, and an image size adjustment module that adjusts the image light to project directly onto the windshield, eliminating the need for a separate display screen and optimizing the image size and position based on user height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional HUD uses a single reflection mirror with large distance from image source, then the optical path is simple, but the device volume is large and occupies excessive space
Solution Approach 1:
The patent introduces a folded optical path using multiple reflection mirrors arranged at specific angles, transforming the linear optical path into a three-dimensional folded structure. This allows the optical path to return towards the image source direction, significantly reducing the device volume while maintaining adequate image distance.
Solution Approach 2:
The optical components are arranged in a nested configuration where the folded optical path is contained within a compact housing. The multiple reflection mirrors are positioned to create a nested optical structure that minimizes the overall device footprint while maintaining the required optical path length.
2Manufacturing precision
If conventional HUD adds a display screen, then the image quality is improved, but the field of vision is blocked and driving safety is reduced
Solution Approach 1:
The patent removes the physical display screen from the optical path and replaces it with a virtual image projection system. The image source directly projects light through the windshield to create a virtual image in the driver's field of view, eliminating the need for a physical screen that would block vision.
Solution Approach 2:
The windshield serves as an intermediary surface that reflects the projected light to create the virtual image. This allows the image to be displayed without a physical screen in the driver's direct line of sight, maintaining both image quality and field of vision.
3Device complexity
If conventional HUD uses fixed optical path, then the structure is simple, but the adaptability to different user heights is poor
Solution Approach 1:
The patent introduces adjustable mechanisms that allow the optical components to move or rotate, enabling dynamic adjustment of the optical path length and image position. This allows the system to adapt to different user heights and viewing positions while maintaining a relatively simple overall structure.
Solution Approach 2:
The system allows adjustment of optical parameters such as the angle of reflection and the distance between components to optimize the virtual image position for different user heights. This enables a single device structure to serve multiple user configurations through parameter adjustment.
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 solution reduces the volume of the display device, enhances driving safety by allowing users to view information without looking down, and adjusts the image position to ensure optimal visibility for different user heights, improving the overall user experience.
Implementation Method 1
the image light is reflected at least twice by the light reflection module
Implementation Method 2
the image size adjustment module is configured to converge or diverge the image light
Data Source
AI summary
Provided are a vehicle-mounted display device and a display system. The vehicle-mounted display device includes: an image source, a light reflection module, and an image size adjustment module which are located on a light path; wherein the image source is configured to emit image light to the light reflection module according to an image to be displayed; the light reflection module reflects the image light at least twice, and emits same to the image size adjustment module; and the image size adjustment module is configured to adjust and emit the image light incident thereon.