Microlens HUD Display Array for Wide Viewing Angle and Low Stray Light
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Solution Overview
Problem
Current vehicle-mounted head-up display systems face challenges due to complex structures, large volume, and stray light issues, limiting their wide application, especially with increasing HUD aperture sizes.
Innovation Solution
A display device comprising a display array generation device and a first lens layer with a beam splitting element, which provides collimated light beams parallel to each other, allowing for increased viewing angles and reducing the need for multiple collimating light sources and beam translation elements, thereby enhancing the display's field of view and reducing size and weight.
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 angle and field of view are improved, but the structure becomes complex and the volume increases
Solution Approach 1:
The optical system is segmented into a light source unit, a beam splitting element, and a lens array unit. Each component performs a specific function: the light source generates light, the beam splitting element divides it into multiple beams, and the lens array focuses each beam to form an expanded virtual image. This segmentation simplifies the overall structure while achieving large viewing angles.
Solution Approach 2:
Multiple collimating light sources and beam translation elements are merged into a single light source and beam splitting element. The beam splitting element generates multiple collimated light beams from one source, and the lens array processes all beams to form the expanded virtual image, reducing system complexity and volume.
2Adaptability or versatility
If the HUD aperture size is increased to improve viewing angle, then the field of view is improved, but stray light problems worsen
Solution Approach 1:
Each lens in the lens array has a specific function of focusing a corresponding collimated light beam to form a portion of the expanded virtual image. This localized processing ensures that light is precisely directed to the intended viewing areas, reducing stray light even as the overall aperture and field of view increase.
3Manufacturing precision
If multiple collimating light sources and beam translation elements are used to achieve complete image display, then the image quality is improved, but the device size and weight increase
Solution Approach 1:
The beam splitting element serves multiple functions: it divides the light from a single light source into multiple collimated light beams, replacing the need for multiple separate light sources and beam translation elements. The lens array then processes all these beams to form the complete expanded virtual image, reducing device weight while maintaining image 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 enables a wider viewing angle and complete image display even when the user's pupils are off-center, improving the display's field of view and resolution, making it suitable for head-up display systems and augmented reality applications.
Implementation Method 1
a beam splitting element, which provides collimated light beams parallel to each other
Implementation Method 2
the first lens layer includes a plurality of first lenses 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 lenses, so as to realize a plurality of scanning imaging
Implementation Method 3
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 4
obtaining a hologram including amplitude information and phase information of the point light source
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A display device (100) and a vehicle (300) including the display device (100), a vehicle-mounted display system (200) and a method of manufacturing a holographic lens are provided. The display device (100) includes a display array generation device (110) and a first lens layer (120). The display array generation device (110) is configured to provide a plurality of collimated light beams (111) parallel to each other and spaced from each other; the first lens layer (120) is arranged at a light exiting side of the display array generation device (110). The first lens layer (120) includes a plurality of first microlenses (121) arranged in array, and is configured to receive a plurality of collimated light beams (111). The plurality of collimated light beams (111) correspond to the plurality of first microlenses (121), to achieve a plurality of scanning imaging, respectively. The display device (100) can be applied to head-up display systems.