Rail Transportation Head-Up Display Reducing Size via Multi-Dimensional Reflectors
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Solution Overview
Problem
Conventional head-up display devices for rail transportation require both a diffusion sheet and a polarizer to be arranged in the light path of a point light source, leading to a larger device size.
Innovation Solution
A head-up display device design that includes a base plate assembly with a light source assembly, a first reflector assembly, a second reflector assembly, and a third reflector assembly, which emit and diffuse light to form a projected image without needing the second and third reflector assemblies to be on the light path of the light source, allowing for adjustable light position and angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the diffusion sheet and the polarizer are arranged in the light path of the point light source, then the head-up display device can form a projected image, but the device size increases in the direction of the light path
Solution Approach 1:
The patent changes the spatial arrangement from a linear light path configuration to a multi-dimensional configuration where reflectors are positioned on different sides of the base plate. The first reflector is on one side and the second reflector is on the opposite side, allowing light to be redirected through different spatial dimensions rather than requiring all components to be collinear in the light path direction.
Solution Approach 2:
The patent divides the optical system into separate functional modules: a light source assembly, a first reflector assembly, a second reflector assembly, and a third reflector assembly. Each assembly is independently positioned and can be adjusted, allowing the diffusion sheet and polarizer to be separated from the direct light path of the point light source while still achieving image formation.
2Ease of operation
If the second and third reflector assemblies are positioned on the light path of the light source, then light can be effectively directed, but the device complexity increases
Solution Approach 1:
The patent introduces adjustable mechanisms for the base plate and reflector assemblies, allowing the light position and light angle to be dynamically adjusted. The base plate can be moved relative to the base, and the reflectors can be positioned at different angles, providing flexible control over light direction without requiring a fixed complex arrangement.
Solution Approach 2:
The patent uses the base plate as an intermediary component that connects the light source assembly to the reflector assemblies. The base plate serves as a mounting structure that allows the reflectors to be positioned on opposite sides, acting as a mediator that simplifies the overall arrangement while maintaining light direction control capability.
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 reduces the device size by eliminating the need for the second and third reflector assemblies to be on the light path of the light source, while enabling adjustable light positioning and angle adjustments for improved image projection.
Implementation Method 1
a first reflector assembly, disposed on a same side of the base plate assembly as the light source assembly and on a light path of the incident light, so as to enable the first reflector assembly to receive the incident light and emit a reflected light directed toward the first light outlet
Implementation Method 2
a second reflector assembly, disposed on a side of the base plate assembly away from the first reflector assembly and on a light path of the reflected light, so as to enable the second reflector assembly to receive the reflected light and emit a first diffused light
Implementation Method 3
a third reflector assembly, disposed on a same side of the base plate assembly as the second reflector assembly and disposed on a light path of the first diffused light, so as to enable the third reflector assembly to receive the first diffused light and form a projected image
Data Source
AI summary
The present disclosure provides a head-up display device for rail transportation, including: a base plate assembly; a light source assembly, configured to emit an incident light; a first reflector assembly, disposed on a same side of the base plate assembly as the light source assembly and on a light path of the incident light, to receive the incident light and emit a reflected light; a second reflector assembly, disposed on a side of the base plate assembly away from the first reflector assembly and on a light path of the reflected light, to receive the reflected light and emit a first diffused light; and a third reflector assembly, disposed on a same side of the base plate assembly as the second reflector assembly and disposed on a light path of the first diffused light, to receive the first diffused light and form a projected image.