Rotatable Picture Generation Unit for HUD Image Alignment
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Solution Overview
Problem
Conventional head up displays face challenges in accommodating optical element variances across different vehicle models, leading to unwanted rotation of the virtual image, which existing electronic correction methods cannot fully address, limiting flexibility and increasing costs due to fixed positioning requirements.
Innovation Solution
A rotatable Picture Generation Unit (PGU) allows mechanical rotation of the display to correct optical deficiencies, enabling a common HUD housing to be used across multiple vehicles by adjusting the position of optical elements, reducing costs and minimizing scrap from out-of-specification parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic predistortion is used to correct virtual image rotation, then some rotation correction is achieved, but the LCD is overused and correction is limited
Solution Approach 1:
The patent applies the dynamics principle by making the PGU mechanically rotatable rather than fixed. The PGU can physically rotate to different angular positions, dynamically adjusting the optical path to compensate for virtual image rotation. This mechanical rotation provides continuous adjustment capability without overusing the LCD, as the correction is achieved through physical repositioning of optical elements rather than electronic image manipulation.
2Ease of manufacture
If fixed positioning of optical elements is used, then manufacturing is simplified, but adaptability to different vehicle models is reduced
Solution Approach 1:
The patent implements dynamics by providing a rotatable PGU that can be positioned at different angular orientations. This allows the same HUD housing design to be adapted to different vehicle models with varying optical requirements. The PGU can be rotated to specific angles during assembly or adjustment to match the optical characteristics of different windshield geometries and vehicle configurations, thereby achieving versatility without complicating the manufacturing of the housing itself.
Solution Approach 2:
The patent applies parameter changes by allowing the PGU to be rotated to different angular positions, effectively changing the optical parameters of the system. This enables the same physical housing to accommodate variations in optical element positions and windshield angles across different vehicle models by simply adjusting the rotation angle of the PGU, rather than requiring different housing designs for each vehicle type.
3Device complexity
If the PGU position is fixed in the housing, then assembly is simplified, but flexibility in accommodating different vehicle configurations is lost
Solution Approach 1:
The patent resolves this contradiction by making the PGU rotatable within the housing rather than fixed. The rotation mechanism allows the PGU to be positioned at different angular orientations to accommodate various vehicle configurations. During assembly, the PGU can be rotated to the appropriate angle and then secured, providing both the flexibility needed for different vehicles and a relatively simple assembly process that doesn't require complex adjustable mechanisms.
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 provides increased tolerance in optical element positioning, allowing for a single HUD housing to fit various vehicles without additional tooling costs, correcting virtual image rotation and reducing waste, thereby enhancing packaging flexibility and cost-effectiveness.
Implementation Method 1
a picture generation unit producing a light field that is reflected off of a windshield of the motor vehicle such that the light field is visible to a human driver of the motor vehicle as a virtual image
Data Source
AI summary
A head up display mirror holder arrangement for a motor vehicle includes a picture generation unit producing a light field. A mirror reflects the light field such that the light field is visible to the driver as a virtual image. A mirror holder has two opposite ends and an activation feature. The two opposite ends are aligned along a rotational axis of the mirror. The mirror holder retains the mirror. Each of two bushings is coupled to a respective opposite end of the mirror holder. A calibration switch has minimum proximity to the activation feature of the mirror holder.