Head-Up Display Optical Relay for RHD LHD Compatibility
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Solution Overview
Problem
Head-up display devices for right-hand-drive and left-hand-drive cars require different configurations due to varying windshield positions, leading to a lack of compatibility and increased need for dedicated parts.
Innovation Solution
A head-up display device design that includes a first unit generating display light and a second unit guiding the light to a projection target, using optical relays and housings to adjust the irradiation position, allowing for shared components between right-hand-drive and left-hand-drive systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the head-up display device is configured specifically for right-hand-drive or left-hand-drive cars, then the display can be optimized for the specific mounting position and windshield conditions, but the number of common parts between different drive types decreases
Solution Approach 1:
The head-up display device is divided into two independent units: a first unit that generates display light and a second unit that guides the light to the projection target. This segmentation allows each unit to be optimized independently, enabling the same first unit to be used in both right-hand-drive and left-hand-drive configurations while only the second unit needs adjustment for different mounting positions.
Solution Approach 2:
The first unit is designed as a universal component that can be attached to different second units for both right-hand-drive and left-hand-drive cars. The second unit incorporates an optical relay that can shift the irradiation position to accommodate different windshield positions, making the overall system adaptable to multiple drive types while sharing common parts.
2Reliability
If different configurations are used for right-hand-drive and left-hand-drive head-up display devices, then the display conditions can be optimized for each drive type, but the number of dedicated parts increases
Solution Approach 1:
By segmenting the device into a light-generating first unit and a light-guiding second unit, the patent reduces the need for completely different configurations. The first unit remains identical across drive types, while only the second unit's optical relay needs modification to shift irradiation position, significantly reducing the number of dedicated parts required.
Solution Approach 2:
The optical relay in the second unit changes the irradiation position parameter to adapt to different windshield positions for right-hand-drive and left-hand-drive cars. This parameter adjustment allows the same basic configuration to serve both drive types without requiring entirely different dedicated components.
3Device complexity
If the irradiation position is fixed, then the optical system can be simplified, but the device cannot adapt to different windshield positions for different drive types
Solution Approach 1:
The optical relay acts as an intermediary component between the fixed light source in the first unit and the windshield in the second unit. It mediates the light path to shift the irradiation position, allowing the system to adapt to different windshield positions while keeping the overall optical system relatively simple and modular.
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 design increases the number of common parts for both drive types, reducing the need for dedicated components and enhancing compatibility.
Implementation Method 1
a first optical relay that guides the display light from the display to the second unit along an imaginary plane
Implementation Method 2
a first optical relay that guides the display light from the display to the second unit along an imaginary plane
Implementation Method 3
a second optical relay that guides the display light to the projection target member to shift an irradiation position
Implementation Method 4
a second optical relay that guides the display light to the projection target member to shift an irradiation position
Data Source
AI summary
A head-up display device makes it possible to increase the number of common parts between when mounted in a right-hand-drive car and when mounted in a left-hand-drive car. A head-up display device includes: a first unit which generates display light; and a second unit to which the first unit is attached, and which displays a virtual image by guiding the display light generated by the first unit to a windshield. The first unit is provided with a projector which emits the display light, and a first optical relay which guides the display light from the projector to the second unit along a virtual plane. The second unit is provided with a second optical relay which guides the display light to the windshield such that an irradiation position at which the windshield is irradiated with the display light is shifted in a car width direction crossing the virtual plane.