Adjustable Curvature MEMS Mirror for HUD Projection Alignment
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Solution Overview
Problem
Existing image projection devices for head-up displays face challenges in maintaining consistent image formation and resolution across varying projection distances due to misalignment of the imaging point and changes in spot diameter, requiring specific optical systems for each vehicle type, which increases costs and complexity.
Innovation Solution
The image projection device employs a MEMS mirror with adjustable curvature and a projection optical system that forms a telecentric optical system, allowing for convergence and divergence adjustments of the light beam to align the imaging point with the screen, regardless of projection distance, using either a convex or concave mirror and a condenser lens to maintain constant spot diameter and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common projection optical system is used across different vehicle types, then device complexity and cost are reduced, but imaging performance deteriorates due to misalignment of the imaging point and changes in spot diameter when projection distance varies
Solution Approach 1:
The patent applies dynamics by making the projection optical system adjustable rather than fixed. The optical system can change its focal length and projection distance according to different vehicle types and installation positions, allowing a single common optical system to adapt to multiple applications while maintaining proper imaging point alignment and spot diameter consistency across varying projection distances
Solution Approach 2:
The patent utilizes parameter changes by varying the focal length and projection distance parameters of the projection optical system. By adjusting these optical parameters, the system can compensate for different installation positions and vehicle types, ensuring that the imaging point remains aligned and spot diameter remains consistent without requiring separate optical systems for each application
2Adaptability or versatility
If the projection distance varies, then adaptability to different vehicle types is improved, but image quality deteriorates due to changes in spot diameter and imaging point position
Solution Approach 1:
The patent applies dynamics by enabling the projection optical system to dynamically adjust its focal length in response to varying projection distances. This dynamic adjustment allows the system to maintain consistent spot diameter and imaging point alignment across different vehicle types and installation positions, preventing image quality deterioration despite changes in projection distance
Solution Approach 2:
The patent implements feedback mechanisms that monitor the actual projection distance and imaging point position, then automatically adjust the optical system parameters to compensate for deviations. This feedback control ensures that spot diameter and imaging point alignment remain within acceptable tolerances even when projection distance varies due to different vehicle configurations
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
This solution enables good imaging performance with a common projection optical system across different vehicle types, ensuring consistent image formation and resolution by aligning the imaging point with the screen and suppressing changes in spot diameter, even with varying projection distances.
Implementation Method 1
The scanning unit is configured to deflection scan the light beam whose convergence and divergence are adjusted by the adjusting unit
Implementation Method 2
The projection optical system includes at least one optical element and is configured to project the light beam, which is deflection scanned by the scanning unit, onto the projection target surface
Data Source
AI summary
An image projection device includes an emitting unit, a shaping unit, an adjusting unit, a scanning unit, and a projection optical system. The projection optical system is disposed such that a position of a front side principal plane of the projection optical system is at a position which is separated from the scanning unit by a focal length of the projection optical system.