Holographic Windscreen Projection With Digital Lensing Correction
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Solution Overview
Problem
The curvature of a vehicle's windscreen applies lensing power to holographic images projected onto it, causing distortion and requiring complex and costly freeform mirrors for correction.
Innovation Solution
A method of compensating for the irregular optical power of a windscreen by combining image-content data with data having a lensing effect, allowing for adjustable compensation of the optical element's power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If freeform mirrors are used to correct windscreen lensing effects, then image distortion is reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts the lensing effect from the physical optical system and represents it as a separate computational data layer. By measuring the windscreen's lensing characteristics and encoding them as lensing data, the system separates the correction function from complex freeform mirrors, achieving distortion correction through software-based holographic compensation instead of complex optical components.
Solution Approach 2:
The patent replaces the mechanical/optical correction system (freeform mirrors) with a computational system. The lensing correction is achieved through digital signal processing of holographic data rather than through physical mirror geometries, substituting a mechanical optical correction approach with an information-processing approach.
2Manufacturing precision
If fixed optical correction elements are used, then image distortion is corrected, but adaptability to different viewing angles and windscreen shapes is reduced
Solution Approach 1:
The patent implements a dynamic correction system where the lensing data and holographic compensation parameters can be adjusted in real-time based on viewing angle and windscreen characteristics. Unlike fixed freeform mirrors, the computational model can be reconfigured for different scenarios, allowing the system to adapt to varying viewing conditions and different windscreen geometries through software updates rather than physical reconfiguration.
Solution Approach 2:
The patent changes the approach from fixed physical parameters (mirror geometry) to adjustable computational parameters (lensing data, holographic compensation factors). By representing the windscreen's optical effects as measurable parameters that can be digitally adjusted, the system gains flexibility to accommodate different viewing angles and windscreen shapes without requiring physical redesign.
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 approach enables clear and distortion-free holographic projections onto a windscreen without the need for expensive freeform mirrors, allowing for real-time adjustment to accommodate different viewing angles or windscreen shapes.
Implementation Method 1
The curvature of a vehicle's windscreen applies lensing power to holographic images projected onto it
Implementation Method 2
spatially modulating light with the first holographic data to form a first spatially modulated light beam
Implementation Method 3
redirecting the first spatially modulated light beam using the optical element
Data Source
AI summary
There is provided a method of projection using an optical element having spatially variant optical power. The method comprises combining Fourier domain data representative of a 2D image with Fourier domain data having a first lensing effect to produce first holographic data. Light is spatially modulated with the first holographic data to form a first spatially modulated light beam. The first spatially modulated light beam is redirected using the optical element by illuminating a first region of the optical element with the first spatially modulated beam. The first lensing effect compensates for the optical power of the optical element in the first region.