HUD Liquid Crystal Panel Imaging Distance and Size Adjustment
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Solution Overview
Problem
Current head-up display systems lack the ability to dynamically adjust imaging conditions, such as imaging distance and size, to effectively integrate information into the driver's field of view without significantly altering their line of sight, limiting flexibility and usability in various environments.
Innovation Solution
The system incorporates an image adjustment device with liquid crystal panels, a controller, and a reflector to dynamically adjust the imaging conditions of the projected image, allowing for multiple imaging distances and sizes by using phase retarders, lenses, and diffusers, enabling flexible and intuitive visual presentation of information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a head-up display system projects light onto the windshield to display information, then the driver can confirm route guidance, emergency information, and vehicle status, but the system lacks the ability to dynamically adjust imaging conditions such as imaging distance and size
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed optical components with dynamically adjustable liquid crystal panels. The first liquid crystal panel adjusts imaging distance by changing its optical properties in response to control signals, while the second liquid crystal panel adjusts image size similarly. This allows the head-up display system to dynamically adapt imaging conditions without requiring multiple fixed optical systems, thereby improving versatility while controlling complexity.
Solution Approach 2:
The patent implements parameter changes by utilizing the electro-optic properties of liquid crystal materials. By applying different voltages to the liquid crystal panels, the system changes their refractive indices and optical path lengths, which directly controls the imaging distance and image size parameters. This electrical control mechanism enables continuous adjustment of imaging parameters without mechanical movement, resolving the contradiction between adaptability and device complexity.
2Adaptability or versatility
If the system presents information as far images integrated into the real environment, then the driver can maintain their line of sight, but the system cannot switch to near images for different viewing conditions
Solution Approach 1:
The patent uses dynamic control of the first liquid crystal panel to adjust imaging distance between far and near positions. The controller receives signals and modifies the optical path through the liquid crystal panel, enabling the system to switch between presenting information as far images (integrated into the environment) and near images (for detailed viewing), all while maintaining a fixed physical display apparatus and minimizing line of sight adjustment requirements.
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 allows for adjustable imaging distances and sizes, enhancing the system's flexibility and usability by allowing information to be presented as either far or near images, improving the driver's visual experience without changing their line of sight, and accommodating different windshield curvatures and orientations.
Implementation Method 1
the liquid crystal panel is a phase retarder
Implementation Method 2
the second liquid crystal panel is a liquid crystal lens
Implementation Method 3
The reflector is adapted to reflect the image light passing through the image adjustment device to a projection screen
Data Source
AI summary
A head up display system is provided and includes an image source, an image adjustment device, a controller, and a reflector. The image source is adapted to output an image with an image light traveling in a light path. The image adjustment device is positioned on the light path of the image light, wherein the image adjustment device comprises a liquid crystal panel. The controller is adapted to control the image adjustment device. The reflector is adapted to reflect the image light passing through the image adjustment device to a projection screen. A display method of a head up display system is also provided in the disclosure.