Fibre Optic Face Plate Layout for Compact Vibration-Robust HUDs
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Solution Overview
Problem
Existing head-up displays (HUDs) face constraints due to the size and weight of optical components, which require significant space and are sensitive to vibrations, and adjusting multiple light paths for different sources is challenging, leading to difficulties in achieving a unified image plane.
Innovation Solution
The use of a rigid fibre optic face plate to transfer images from an image generator to a surface element, allowing for flexible adaptation to constrained geometries and reducing sensitivity to vibrations, while maintaining image focus without extensive optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical components (lenses, mirrors) are used to transfer images in HUDs, then image quality can be maintained, but the size and weight of the display arrangement increases significantly
Solution Approach 1:
The patent replaces conventional mechanical optical components (lenses, mirrors) with a fibre optic face plate that uses light-guiding fibres to transfer images. This substitution eliminates the need for bulky optical elements while maintaining image transfer capability, directly resolving the contradiction between image quality and weight/size.
Solution Approach 2:
The fibre optic face plate acts as an intermediary medium between the image source and the display surface. Instead of using free-space optical paths requiring large lenses, the fibres serve as a compact intermediary that guides light from the image plane to the display plane, reducing overall system size and weight.
2Measurement precision
If conventional optical components are used, then images can be transferred, but the arrangement requires considerable space for optical paths
Solution Approach 1:
The patent replaces free-space optical paths with fibre optic waveguides. The fibres confine and guide light through their internal structure, eliminating the need for large clearance spaces around optical components. This directly reduces the area required for optical path accommodation.
Solution Approach 2:
The fibre optic face plate uses thin fibre bundles to create compact optical paths. The fibres can be arranged in dense configurations within a thin face plate structure, enabling image transfer in a compact form factor that minimizes the space required for optical paths.
3Adaptability or versatility
If multiple light sources are used, then different image information can be displayed, but adjusting all paths to the same image plane becomes difficult
Solution Approach 1:
The fibre optic face plate is segmented into multiple independent fibre bundles, each corresponding to a specific light source or image channel. Each bundle can be independently optimized and positioned, making it easy to accommodate multiple light sources without complex adjustments to shared optical paths.
Solution Approach 2:
The fibre optic face plate provides a universal platform that can accommodate multiple light sources and image channels simultaneously. The modular fibre bundle structure allows different sources to be coupled to specific fibre regions, enabling versatile multi-channel operation without increasing adjustment complexity.
4Measurement precision
If free-space optical paths are used between lenses, then optical transmission can be achieved, but the arrangement becomes sensitive to vibrations and forces
Solution Approach 1:
The patent replaces free-space optical paths with solid fibre optic waveguides. The fibres physically constrain and guide light through their cladding structure, making the optical transmission immune to vibrations and forces that would affect free-space paths. This directly improves reliability under vibrational conditions.
Solution Approach 2:
The fibre optic face plate provides inherent mechanical protection for the optical paths. The fibres are embedded within a rigid face plate structure that cushions and protects them from vibrations and forces before they can affect optical transmission, ensuring stable image transfer under adverse conditions.
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 fibre optic face plate enables efficient image transfer with improved robustness and flexibility, allowing multiple image sources to be combined or divided into separate planes without geometric distortion, enhancing the practicality and performance of HUDs.
Implementation Method 1
a fibre optic face plate comprising a first side having a first surface and a second side having a second surface, said fibre optic face plate being arranged to transmit light incident on the first surface to the second surface
Data Source
Figure 1~2
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Figure 6a~7
AI summary
The present disclosure relates to a head up or head mounted display arrangement and a method for presenting at least one image via at least one surface element of a head up or head mounted display arrangement. The arrangement comprises at least one image generating element (301, 302) arranged to generate an image in a first image plane (346', 346"), at least one surface element, and a fibre optic face plate (340).The face plate is arranged in relation to the at least one image generating element such that the first surface lies at a first image plane. A second image plane lies at the second surface and the at least one surface element is arranged in the beam path from the second surface. The first image plane comprises a plurality of first part image planes each associated with an individual first part surface of the fibre optic face plate and/or the second image plane comprises a plurality of second part image planes each associated with an individual second part surface of the fibre optic face plate.