Tilted HUD Projection System Reducing Image Distortion
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Solution Overview
Problem
Current projection systems for head-up displays (HUDs) experience significant image field distortion when tilting the intermediate image plane, leading to artifacts and inhomogeneous brightness, especially with high-resolution imagers, and result in increased costs and weight due to oversized optics.
Innovation Solution
A projection system comprising at least three assembly groups with connected optical axes, where at least two groups are tilted and/or staggered relative to each other, allowing the optical axis of the image-side assembly group to be inclined relative to the image plane, thereby reducing image field distortion and optimizing optics for the image field size, weight, and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Scheimpflug principle is applied to tilt the intermediate image plane, then the intermediate image can be tilted with maximum sharpness, but considerable image field distortion occurs leading to artifacts and inhomogeneous brightness
Solution Approach 1:
The projection system is divided into multiple lens groups (first, second, and third lens groups) with distinct functions. The first lens group performs initial imaging, the second lens group tilts the intermediate image plane, and the third lens group performs final imaging. This segmentation allows each group to be optimized for its specific function, reducing overall distortion while maintaining sharpness.
Solution Approach 2:
The second lens group acts as an intermediary between the object and image planes, specifically designed to tilt the intermediate image plane without causing excessive distortion. This intermediary component enables independent control of image plane orientation separate from the main imaging path.
2Reliability
If off-axial use of imaging optics is employed to tilt the intermediate image plane, then tilting is achieved, but the optics must be designed for a significantly larger image field making the system more expensive and heavier
Solution Approach 1:
The second lens group is designed with specific local optical properties tailored for tilting the intermediate image plane. By optimizing only the local region where tilting occurs rather than designing the entire optical system for a larger field, the weight and cost are significantly reduced while achieving the required tilting functionality.
3Reliability
If off-axial use of imaging optics is employed to tilt the intermediate image plane, then tilting is achieved, but the system becomes considerably more expensive due to larger optics
Solution Approach 1:
The second lens group is designed with specific local optical properties tailored for tilting the intermediate image plane. By optimizing only the local region where tilting occurs rather than designing the entire optical system for a larger field, the weight and cost are significantly reduced while achieving the required tilting functionality.
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 configuration significantly reduces image field distortion by compensating aberrations and allows for a lighter, more cost-effective HUD projection system with improved imaging performance.
Implementation Method 1
a projection system for imaging an object into an image plane
Implementation Method 2
at least two of the assembly groups are arranged tilted and/or staggered relative to each other, and the optical axis of the image-side assembly group is inclined relative to the optical axis of the object in the object plane
Data Source
AI summary
Described is a projection system for imaging an object into an image plane, including at least a first assembly group, a second assembly group and a third assembly group. Each of the assembly groups has at least one connected common optical axis (O1, O2, O3). A first assembly group comprises the object and a second assembly group comprises an optical component. At least two of the assembly groups are arranged tilted and/or staggered relative to each other. The optical axis (O3) of the image-side assembly group is inclined relative to the optical axis (OE) of the image (E) in the image plane. This provides a projection system from the imager to the intermediate image for a head-up display (HUD) with a tilted intermediate image plane with significantly reduced image field distortion and a dimensioning of the imaging optics adapted to the image field size for light weight and low costs.