Head-Up Display Drive Lens Shift for Sight Distance Adjustment
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Solution Overview
Problem
Existing image projector systems for vehicles lack the ability to effectively adjust the position of virtual images projected onto windshields, leading to suboptimal visibility and image quality due to limitations in shifting the sight distance and field of view.
Innovation Solution
An image projector system that includes a display device and a projection optical system with a lens group comprising a drive lens and a fixed lens, where the drive lens shifts along the optical path to change its distance from the display device, allowing for adjustable sight distance and field of view, thereby enabling precise positioning of virtual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional display device projects images onto a windshield without a drive lens, then the structure is simple, but the sight distance and field of view cannot be adjusted
Solution Approach 1:
The patent applies the dynamics principle by making the lens group movable along the optical path. The drive lens can shift its position relative to the display device, enabling dynamic adjustment of the sight distance and field of view of the virtual image. This transforms a static projection system into a dynamic one that can adapt to different viewing requirements while maintaining a relatively simple overall structure.
2Adaptability or versatility
If the drive lens shifts position to adjust sight distance, then the virtual image position can be changed, but image distortion occurs
Solution Approach 1:
The patent applies parameter changes by carefully designing the lens group parameters (focal length, curvature, spacing) to compensate for the distortion introduced by lens movement. The lens group is configured with specific optical parameters that, when shifted, change the sight distance while maintaining proper image geometry. This allows the system to adjust virtual image position without introducing unacceptable distortion.
3Adaptability or versatility
If the lens group shifts to change sight distance, then the field of view can be adjusted, but the depression angle may change
Solution Approach 1:
The patent applies local quality by designing the lens group with non-uniform optical properties across its aperture. Different zones of the lens have optimized characteristics that work together to maintain a constant depression angle while allowing field of view adjustment. This localized optimization of optical properties enables independent control of field of view and depression angle.
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 system allows for satisfactory correction of image distortion and maintains a fixed field of view and depression angle, providing improved visibility and image quality by adjusting the sight distance and position of virtual images.
Implementation Method 1
The projection optical system has a lens group including at least one lens element
Implementation Method 2
projects light onto a transmissive reflecting member to show a virtual image
Data Source
AI summary
A head-up display includes a display device and a projection optical system. The projection optical system has a lens group including at least one lens element and projects onto a reflecting member an image displayed on the display device. The lens group includes a drive lens that shifts along an optical path to change its distance from the display device.