Head-Up Display Relay Optic Aberration Compensation
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Solution Overview
Problem
Conventional head-up display systems face challenges with aberrations and limited field of view due to tilted power combiners, requiring complex and costly holographic elements for correction, which are sensitive to vibrations and have high development costs.
Innovation Solution
A head-up display system using a relay optic assembly without holographic elements, featuring a spherical mirror to compensate for aberrations and a tilted power combiner with a wedge configuration and dichroic coating for line-of-sight correction, allowing for a flexible design with reduced costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If holographic elements are used in the relay optic assembly to correct aberrations, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the holographic elements from the relay optic assembly, replacing them with conventional optical elements. This removes the complexity and cost associated with holographic technology while maintaining aberration correction capabilities through alternative means.
Solution Approach 2:
The patent uses conventional optical elements that replicate the aberration correction function of holographic elements. By copying the functional effect using simpler, more established technology, the system achieves the same manufacturing precision without the complexity of holographic components.
2Manufacturing precision
If holographic elements are used to correct line-of-sight errors, then manufacturing precision is improved, but weight increases leading to sensitivity to vibrations
Solution Approach 1:
The patent removes holographic elements from the combiner design and replaces them with conventional optical elements. This extraction reduces the weight of the combiner assembly while maintaining the line-of-sight error correction function through alternative optical configurations.
Solution Approach 2:
The patent employs conventional optical elements that are lighter and less expensive than holographic elements. These simpler elements achieve the same correction function without the weight penalty, making the system less sensitive to platform vibrations.
3Ease of operation
If tilted power combiners are used to superimpose information, then ease of operation is improved, but aberrations are generated that are difficult to correct
Solution Approach 1:
The patent introduces a relay optic assembly as an intermediary between the display device and the tilted power combiner. This intermediary corrects the aberrations generated by the combiner's tilted configuration, allowing the system to maintain both ease of operation and high image quality.
Solution Approach 2:
The patent modifies optical parameters within the relay optic assembly to compensate for aberrations. By changing parameters such as element positions, curvatures, and spacings, the system corrects the aberrations produced by the tilted combiner while preserving the information superposition function.
4Device complexity
If conventional relay optic assemblies are used without aberration compensation, then device complexity is reduced, but field of view quality deteriorates at the edges
Solution Approach 1:
The patent applies local quality correction by using optical elements with specific properties positioned at particular locations in the relay optic assembly. This targeted approach corrects edge field of view aberrations without requiring complex holographic elements throughout the entire system, maintaining relative simplicity while improving edge quality.
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 solution provides high-quality imagery over a large field of view with reduced costs and complexity, eliminating the need for holographic elements and enabling easy adaptation to various applications.
Implementation Method 1
a spherical mirror generating aberrations in the intermediate image tending to compensate for aberrations produced by the tilted power combiner
Implementation Method 2
a tilted power combiner for superimposing the information displayed by the display device onto the forward view of the outside by the eye of the observer
Implementation Method 3
a relay optic assembly between the display device and the tilted power combiner for forming an intermediate image of the displayed information forwardly of the combiner
Data Source
AI summary
A head-up display system includes a display device for generating and displaying information to an eye of an observer; a tilted power combiner for superimposing the information displayed by the display device onto the forward view of the outside by the eye of the observer; and a relay optic assembly between the display device and the tilted power combiner for forming an intermediate image of the displayed information forwardly of the combiner that reflects the image towards the eye of the observer within an eye motion box to produce a large field of view for the observer. The relay optic assembly is void of holographic elements and includes a spherical mirror generating aberrations in the intermediate image tending to compensate for aberrations produced by the tilted power combiner.