HUD Optical Guide Assembly Segmentation for Large Field of View
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Solution Overview
Problem
Existing head-up display systems with large field of view and virtual image distance face difficulties in processing and high costs due to the limitations of existing technology in handling optical guides larger than 12 inches in size.
Innovation Solution
A head-up display system comprising an optical guide assembly with multiple optical guides, which are horizontally or vertically disposed below a transmission-reflection plate, allowing incident light to be coupled in and out to form divided fields of view, thereby expanding the field of view and eyebox while reducing processing difficulties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single large-area optical guide is used to achieve large field of view and virtual image distance, then the HUD performance is improved, but the processing difficulty and cost increase significantly
Solution Approach 1:
The patent divides the large-area optical guide into multiple smaller optical guides (first optical guide, second optical guide, etc.) that can be processed separately using existing mature technologies. Each optical guide has a size within the 12-inch wafer processing capability, eliminating the need for complex large-area processing while collectively achieving the required large field of view through their combined optical paths.
2Adaptability or versatility
If a single large-area optical guide is used to achieve large field of view, then the virtual image distance is improved, but the manufacturing cost increases
Solution Approach 1:
The optical guide is segmented into multiple manageable components that can be manufactured using standard 12-inch wafer processing techniques. This segmentation enables mass production through established manufacturing processes, significantly reducing the cost compared to developing and producing custom large-area optical guides.
Solution Approach 2:
Multiple smaller optical guides are optically combined to function as a single large-area optical guide. The light from the light source passes through multiple optical guides in sequence or parallel, achieving the cumulative optical path length and field of view equivalent to a single large optical guide, but at lower manufacturing cost.
3Ease of manufacture
If multiple optical guides are used to reduce processing difficulty, then the ease of manufacture is improved, but the device complexity increases
Solution Approach 1:
Multiple optical guides are integrated into a unified optical guide assembly with a common light source and coordinated optical paths. The individual optical guides work together as a cohesive system, managed by single control units, which reduces the operational complexity despite the increased number of components.
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 system effectively reduces processing challenges and maintains performance by using multiple optical guides to achieve a larger field of view and eyebox, enabling the use of existing mature processes for smaller wafer sizes, facilitating mass production.
Implementation Method 1
the optical guide assembly receives the incident light and outputs an exit light, and wherein the optical guide assembly comprises at least two optical guides, and the incident light is coupled in and coupled out by the at least two optical guides
Implementation Method 2
the head-up display system further comprises a transmission-reflection plate for reflecting the exit light to a human eye
Data Source
AI summary
A head-up display system and a vehicle are disclosed, the head-up display system comprises a light source and an optical guide assembly (1); an incident light emitted from the light source is incident into the optical guide assembly (1); the optical guide assembly (1) receives the incident light and outputs an exit light; the optical guide assembly (1) comprises at least two optical guides, and the incident light is coupled in and coupled out by the at least two optical guides and then is exited to form at least two divided field of views. By replacing the light guide (4) in the prior art with the optical guide assembly (1), the difficulty for processing a large area optical guide is effectively reduced, and a purpose of expanding an angle of field of view of an HUD and an eyebox is achieved.