Diffractive Signaling Device for Rear-View Mirror
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Solution Overview
Problem
Existing rear-view mirror signaling systems are bulky, energy-inefficient, and require multiple light sources and complex assemblies, leading to increased costs and reduced visibility due to dust accumulation and limited capacity for displaying multiple symbols.
Innovation Solution
A compact diffractive signaling device with a symbol generation unit featuring a diffraction grating on the mirror's surface, utilizing a single electroluminescent diode and optical interfaces to direct light beams for 2D/3D symbol formation without affecting the mirror's architecture, allowing multiple symbols to be displayed efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a partially transmissive mirror is used to display illuminated signals, then the signaling function is achieved, but the rear-view function is degraded and energy consumption increases
Solution Approach 1:
The mirror surface is segmented into two functional zones: a first zone that is fully reflective for optimal rear-view observation, and a second zone that is transparent to allow light transmission for signaling. This segmentation allows each zone to perform its specific function without compromising the other, resolving the contradiction between signaling and rear-view quality.
Solution Approach 2:
Different regions of the mirror are assigned different optical properties: the first zone has high reflectivity while the second zone has high transparency. This local differentiation of quality allows the mirror to simultaneously achieve excellent rear-view performance in the first zone and effective signaling in the second zone, eliminating the need for a uniformly partially transmissive mirror.
2Adaptability or versatility
If multiple light sources and light guides are used to display multiple symbols, then multiple signaling functions are achieved, but device complexity and cost increase
Solution Approach 1:
A single light source serves multiple functions by illuminating different portions of the transparent second zone at different times to display various signaling symbols. The diffraction grating structure enables this one element to generate multiple distinct optical patterns, replacing what would otherwise require multiple light sources and complex light guide assemblies for each symbol.
Solution Approach 2:
The diffraction grating creates optical copies of the light beam in different directions and patterns. By diffracting the single light source, the system generates multiple virtual light paths that form different signaling symbols, effectively copying the light function to achieve multiple signaling capabilities without physical multiplication of light sources.
3Adaptability or versatility
If a bulky illuminated display system is installed in the rear-view mirror, then signaling capability is achieved, but the mirror thickness and overall size increase
Solution Approach 1:
The signaling functionality is extracted from the traditional bulky illuminated display system and implemented through a thin-film diffraction grating deposited on the mirror surface. This extraction reduces the signaling component from a volumetric assembly to a surface-level optical structure, dramatically reducing the added thickness while maintaining signaling capability.
Solution Approach 2:
The diffraction grating is implemented as a thin film deposited on the mirror surface, replacing thick rigid illuminated display assemblies. This thin-film approach allows the signaling function to be integrated into the mirror with minimal thickness addition, achieving compact integration without sacrificing optical performance.
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 provides a high-energy-efficient, compact, and cost-effective system capable of producing bright, visible signals with minimal thickness addition to the mirror, enabling multiple 2D/3D symbols without degrading the rear-view function or increasing mechanical capacity.
Implementation Method 1
the optical device includes a symbol generation unit which is provided with at least a diffraction grating designed to form an illuminated image corresponding to the first illuminated symbol when the illumination unit is lit
Implementation Method 2
utilizing a single electroluminescent diode and optical interfaces to direct light beams
Implementation Method 3
an optical device permitting orientation of the light beam produced by the illumination unit in a determined direction orientated towards the rear
Data Source
AI summary
Signaling device designed to be arranged on the reflective element forming a mirror of a rear-view device comprising at least an illumination unit and at least an optical device, characterized by the fact that the optical device includes a symbol generation unit which is provided with at least a diffraction grating designed to form an illuminated image corresponding to a first illuminated symbol, the symbol generation unit being generally transparent and the diffraction grating being formed on the surface of the symbol generation unit without affecting its transparency.