Head-Up Display Virtual Image Position Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional head-up display devices require a larger curved mirror to accommodate varying virtual image positions, which increases device size, posing a challenge in compact installation within limited vehicle spaces while maintaining display quality.
Innovation Solution
A head-up display device that includes a virtual-image-position change portion and a display-size change portion, utilizing a projection optical system with movable lenses to adjust the position and size of the virtual image, and optionally using a diffuser, reflecting members, or a transparent medium to satisfy specific conditional expressions for optimal display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the interval between the image display element and the curved mirror is increased to display a virtual image at a position distant from the image-reflecting surface, then the virtual image can be displayed at the desired position, but the size of the curved mirror must be increased to maintain adequate use range
Solution Approach 1:
The patent applies dynamics by making the interval between the image display element and curved mirror variable rather than fixed. The virtual image position changing portion adjusts this interval dynamically to display virtual images at different distances from the image-reflecting surface, allowing a single curved mirror to serve multiple display positions without requiring multiple mirrors of different sizes
Solution Approach 2:
The patent changes the parameter of the interval between the image display element and curved mirror to control virtual image position. By varying this parameter, the system achieves different virtual image distances while maintaining consistent curved mirror use range, eliminating the need to increase mirror size
2Adaptability or versatility
If the curved mirror size is increased to accommodate varying virtual image positions, then the use range is sufficient for all display positions, but the device size increases making compact installation difficult
Solution Approach 1:
The system uses a variable interval mechanism that dynamically adjusts the distance between the image display element and curved mirror. This dynamic adjustment allows a compact curved mirror to adapt to different virtual image display positions, providing full versatility without increasing device volume
Solution Approach 2:
The patent makes the curved mirror multi-functional by enabling it to display virtual images at multiple distances from the image-reflecting surface. The virtual image position changing portion allows a single curved mirror to perform the function of multiple mirrors with different sizes, achieving universality in a compact form
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 allows for a compact head-up display device that can change virtual image positions and sizes effectively, reducing the size of the curved mirror and maintaining high display quality by ensuring the use range of the curved mirror remains consistent across different display positions, thus addressing the need for a smaller device without compromising visibility.
Implementation Method 1
a head-up display device that reflects and enlarges an image, which is displayed on an image display element, by a curved mirror to allow an observer to visually recognize the image as a virtual image
Data Source
AI summary
There is provided a head-up display device that reflects and enlarges an image, which is displayed on an image display element, by a curved mirror, allows an observer to visually recognize the image as a virtual image, can change a virtual image display position, and is small. A head-up display device, which reflects and enlarges a displayed primary display image by a curved mirror and allows an observer to visually recognize the primary display image as a virtual image, includes a virtual-image-position change portion of changing a distance between the observer and the virtual image and a display-size change portion of changing the display size of the primary display image, and is adapted to satisfy the following conditional expression (1).2.5<(Hf/Hn)/(Bf/Bn)<15.0 (1)