Microlens HUD Optics for Wide Viewing Angle and Stray Light Control
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Solution Overview
Problem
Current vehicle-mounted head-up display systems face challenges with complex structure, large volume, and stray light issues, limiting their wide application due to refractive-reflective and waveguide structures, especially with increasing HUD aperture sizes.
Innovation Solution
A display device comprising a display array generation device and a first lens layer with a plurality of collimated light beams and microlenses arranged in an array, allowing for scanning imaging and improved viewing angles by distributing emergent sites of collimated light beams to enhance the exit pupil diameter and reduce stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a refractive-reflective optical system is used to achieve large exit pupil distance, large window size, and large viewing angle, then the viewing performance is improved, but the structure becomes complex and volume increases
Solution Approach 1:
The optical system is segmented into multiple lens layers (first lens layer with first microlenses, second lens layer with second microlenses) arranged in sequence. Each lens layer processes specific light beams (scanning light beams and collimated light beams respectively), dividing the complex optical functions into simpler modular components that can be independently optimized and manufactured.
2Device complexity
If a waveguide structure is used to implement head-up display, then the system integration is improved, but stray light problems worsen with increasing aperture
Solution Approach 1:
The patent extracts and eliminates the waveguide structure that causes stray light problems. Instead of using a waveguide, the invention employs free-space optical propagation with multiple lens layers to achieve the desired optical functions without the harmful stray light effects inherent in waveguide-based systems.
3Area of stationary object
If the HUD aperture is increased to improve viewing performance, then the viewing angle and window size are improved, but the stray light problem worsens
Solution Approach 1:
Multiple lens layers act as intermediary optical elements that systematically control and direct light beams. The first lens layer processes scanning light beams to generate collimated light beams, and the second lens layer further processes these collimated beams. This intermediary multi-layer lens structure enables large aperture operation while maintaining precise light control to minimize stray light.
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 enables a wider viewing angle and reduced stray light, allowing for a more compact and efficient head-up display system that can provide a complete image even when the user's pupils are off-center, improving the display's resolution and clarity.
Implementation Method 1
the first lens layer is arranged at a light exiting side of the display array generation device, includes a plurality of first microlenses arranged in array, and is configured to receive the plurality of collimated light beams. The plurality of collimated light beams correspond to the plurality of first microlenses, to achieve a plurality of scanning imaging, respectively.
Implementation Method 2
irradiating one surface of the photosensitive substrate by light outputted from the point light source, simultaneously, irradiating the other surface of the photosensitive substrate by the parallel light as a reference light, to allow the photosensitive substrate to record an interference pattern of the point light source and the reference light
Implementation Method 3
providing a photosensitive substrate; providing a point light source and a parallel light on two sides of the photosensitive substrate, respectively; irradiating one surface of the photosensitive substrate by light outputted from the point light source
Data Source
AI summary
A display device and a vehicle including the display device, a vehicle-mounted display system and a method of manufacturing a holographic lens are provided. The display device includes a display array generation device and a first lens layer. The display array generation device is configured to provide a plurality of collimated light beams parallel to each other and spaced from each other; the first lens layer is arranged at a light exiting side of the display array generation device. The first lens layer includes a plurality of first microlenses arranged in array, and is configured to receive a plurality of collimated light beams. The plurality of collimated light beams correspond to the plurality of first microlenses, to achieve a plurality of scanning imaging, respectively. The display device can be applied to head-up display systems.