Head-Up Display Position Correction for Vibration Stability
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Solution Overview
Problem
Conventional head-up display devices adjust the display position of virtual images based on vehicle vibrations using a single means, which is insufficient for reducing vibrations of varying frequencies and amplitudes, leading to instability of the image projection.
Innovation Solution
A display device with a position correcting unit that selects from multiple correcting units based on the frequency component of the orientation signal, using different means to adjust the display position of virtual images, such as changing the image on the display surface, the direction or position of optical elements, or the display surface itself, to effectively counteract various types of vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single correcting unit is used to adjust display position, then the device complexity is reduced, but the ability to effectively counteract vibrations of varying frequencies and amplitudes deteriorates
Solution Approach 1:
The position correcting unit is divided into multiple correcting units (first correcting unit, second correcting unit, third correcting unit), each responsible for different frequency ranges of vibrations. This segmentation allows the system to handle various vibration types more effectively while maintaining manageable complexity through modular design.
Solution Approach 2:
The system dynamically selects which correcting unit to operate based on the detected vibration frequency. The position correcting unit changes its configuration in real-time according to vibration conditions, enabling adaptive response to varying vibration frequencies and amplitudes without requiring all correcting units to operate simultaneously.
2Adaptability or versatility
If multiple correcting units with different means are used, then the ability to counteract various vibrations is improved, but the device complexity increases
Solution Approach 1:
Each correcting unit is designed with specific local qualities suited for particular vibration frequency ranges. The first correcting unit handles low-frequency vibrations, the second handles mid-frequency vibrations, and the third handles high-frequency vibrations. This specialization allows each unit to be optimized for its specific function rather than requiring all units to handle all frequency ranges.
Solution Approach 2:
The system changes operational parameters by selecting different correcting units based on vibration frequency detection. Instead of using a single complex unit for all frequencies, the system adjusts which correcting unit is active according to the detected frequency parameters, achieving versatility through parameter-based selection rather than structural complexity.
3Device complexity
If vibration correction is not applied, then the device complexity is minimized, but the image projection stability deteriorates under vehicle vibrations
Solution Approach 1:
The position correcting unit applies preliminary anti-action by detecting vibrations before they significantly affect image stability and applying corrective displacement in the opposite direction. This proactive approach prevents image instability rather than reacting to it, maintaining image position stability with minimal correction effort.
Solution Approach 2:
The system employs feedback by continuously detecting the vibration state of the vehicle and using this information to adjust the display position accordingly. The detection unit monitors vibrations and feeds this information back to the position correcting unit, which then applies appropriate corrections to maintain stable image projection despite vehicle movements.
Data Source
AI summary
A display device includes an image forming unit, a projection unit, a main body, and a position correcting unit. The image forming unit includes a display surface and forms an image on the display surface. The projection unit projects a virtual image corresponding to an image on a target space by using output light from the image forming unit. The main body is equipped with an image forming unit and a projection unit. The position correcting unit changes a display position of a virtual image relative to the main body on the basis of an orientation signal representing an orientation of the main body. The position correcting unit includes a plurality of correcting units that change a display position of a virtual image by using different means. The position correcting unit selects at least one correcting unit from a plurality of correcting units in accordance with a frequency component of an orientation signal, and causes the selected correcting unit to change a display position of a virtual image.