Laser Projection Arrangement for Multi-Plane Virtual Images
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Solution Overview
Problem
Existing head-up display systems require multiple picture generating units to project multiple virtual images at different distances and angles, leading to increased installation space and costs in vehicles.
Innovation Solution
A laser projection arrangement using a picture generating unit with multiple laser sources and a holographic optical element applied to the windshield, allowing for the generation of multiple virtual images at different distances and angles by varying the wavelength and polarization of the laser light, which are then projected onto a shared holographic optical element for display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple picture generating units are used to project multiple virtual images at different distances and angles, then the capability to display multiple virtual images is improved, but the installation space and costs increase
Solution Approach 1:
The patent applies universality by enabling a single picture generating unit to perform multiple functions - projecting multiple virtual images at different distances and angles simultaneously. This is achieved through wavelength-selective optical elements that direct different wavelengths to different image planes, allowing one device to replace what would traditionally require multiple devices
Solution Approach 2:
The patent utilizes parameter changes by varying the wavelength of laser light to control the projection distance and angle of virtual images. By changing the wavelength parameter of the laser source, the system can dynamically adjust which virtual image is projected where, enabling a single unit to generate multiple images at different parameters without requiring additional hardware
2Adaptability or versatility
If multiple picture generating units are used to project multiple virtual images, then the display versatility is improved, but the costs increase
Solution Approach 1:
The patent applies merging by combining multiple laser sources with different wavelengths into a single integrated picture generating unit. Rather than manufacturing and installing separate units for each wavelength, the system merges them into one device with shared optical components, reducing overall manufacturing costs and simplifying installation
3Adaptability or versatility
If multiple picture generating units are used to project multiple virtual images at different distances, then the image generation capability is improved, but the installation space increases
Solution Approach 1:
The patent applies dimensionality change by utilizing the wavelength dimension of light to differentiate between multiple virtual images. Instead of requiring separate physical units occupying different spaces, the system uses wavelength as an additional dimension to encode multiple images, allowing them to be projected from a single location with different optical parameters
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
Enables the cost-effective representation of multiple virtual images at varying distances and angles within the driver's field of view, reducing the need for multiple picture generating units and minimizing space and cost requirements.
Implementation Method 1
A holographic optical element which exhibits different optical properties for different wavelengths λ of the laser light is applied on a surface of the projection surface or integrated into the projection surface
Implementation Method 2
the picture generating unit features at least one laser source and one means for the generation of an image that is to be displayed
Implementation Method 3
an optical module, which permits the beam path through the head-up display to the output opening and which is also referred to as mirror optics
Data Source
AI summary
The Disclosure concerns a laser projection arrangement and a process for the generation of virtual images, the purpose of which is to present a solution which allows a representation of multiple virtual images in different distances or planes and different points of view and that can be manufactured economically. On the arrangement side, this purpose is solved when one of at least two picture generating units that generate virtual images that differ in their wavelength and/or their polarization is arranged and when a holographic optical element is arranged on or in the projection surface. On the process side, the purpose is solved when two virtual images with different wavelengths and/or different polarizations are generated, when a holographic optical element is provided which exhibits different optical properties for different wavelengths and/or different polarizations, and when, in the case of projection of the virtual images while making use of the holographic optical element, the virtual images are represented, due to the different optical properties, at different distances from the driver and/or in different points of view from the driver.