Transmissive Screen Layered Diffusion Plates Head-Up Display Visibility
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Solution Overview
Problem
Current transmission-type screens for head-up displays in vehicles lack enhanced visibility, which affects the user's ability to clearly view projected images without significant changes in their line of sight or focus.
Innovation Solution
The implementation of a configuration that includes a diffusion screen with two layered light diffusion plates and a concave lens, which controls the light distribution angle and principal ray direction, enhancing the visibility of projected images by adjusting the optical path and emission angles to maintain angular differences and prevent double imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transmission-type screen is used to display images, then the driver can recognize information without changing line of sight, but the visibility of the projected image is insufficient
Solution Approach 1:
The optical system is segmented into distinct functional components: a light diffusion plate for scattering light to improve visibility, a concave mirror for focusing and redirecting light, and a convex lens for additional light control. Each component addresses specific visibility issues without requiring complete system redesign.
Solution Approach 2:
A light diffusion plate is introduced as an intermediary element between the light source and the transmission screen. This diffusion plate scatters light to enhance image visibility while a concave mirror acts as an intermediary to redirect and focus light onto the screen, resolving the visibility issue without directly modifying the screen itself.
2Volume of moving object
If the optical unit is designed to be compact, then the device size is reduced, but the light path control and image quality may be compromised
Solution Approach 1:
Curved optical surfaces are employed throughout the system: a concave mirror with a specific radius of curvature to focus light, and a convex lens to further control light paths. These curved surfaces enable precise light path control within a compact form factor by leveraging optical geometry rather than requiring large linear dimensions.
Solution Approach 2:
The optical components are arranged in a nested configuration where the light diffusion plate, concave mirror, and convex lens are positioned in close proximity with optimized spacing. This nesting allows the optical unit to maintain precise light path control while minimizing the overall volume of the optical system.
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 configuration significantly increases the visibility of projected images, allowing users to view virtual images clearly over a range of viewpoints without significant changes in their line of sight, while also enabling a more compact optical unit design.
Implementation Method 1
a diffusion screen having two light diffusion plates which are layered to face each other
Implementation Method 2
an intermediate image formation unit having a concave lens
Data Source
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AI summary
A transmission type screen 362 includes: two light diffusion plates 363a and 363b that respectively have flat surfaces 368a and 368b and light diffusion surfaces 367a and 367b that face the flat surfaces 368a and 368b, respectively, and diffuse and transmit incident light. The two light diffusion plates 363a and 363b are layered such that the respective light diffusion surfaces 367a and 367b face each other, and the respective light diffusion surfaces 367a and 367b diffuse light that is incident on the light diffusion surfaces 367a and 367b in substantially the same light distribution. The light diffusion plates 363a and 363b respectively include base members 366a and 366b having respective principal surfaces and a plurality of light diffusion members 369a and a plurality of light diffusion members 369b that are provided on the respective principal surfaces, and the light diffusion surfaces 367a and 367b may be formed of the respective principal surfaces on which the light diffusion members 369a and the light diffusion members 369b are provided.