Automotive Holographic Light Guide with Absorbing Peripheral Face
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Solution Overview
Problem
Automotive holographic 3D lighting systems suffer from ghost images due to parasitic reflections on light guide plate edges, degrading the perceived quality and sharpness of the holographic effect.
Innovation Solution
A luminous device with a patterned portion featuring small zones of binary gratings and a light-absorbing peripheral face to redirect and absorb unwanted light rays, reducing ghost images by orienting the peripheral face at an angle greater than the maximum refracted light angle and applying a light-absorbing material to minimize reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffractive structure is used to create holographic 3D effect, then the lighting system produces desired optical effects, but parasitic reflections on light guide plate edges generate ghost images that degrade quality
Solution Approach 1:
The patent applies a light-absorbing material to the peripheral faces of the light guide plate, converting the harmful parasitic reflections into absorbed energy. This eliminates ghost images while preserving the desired holographic 3D effect from the diffractive structure.
Solution Approach 2:
The patent applies different properties to different parts of the light guide plate: the main surface maintains optical transparency for holographic effect, while the peripheral faces are treated with light-absorbing material to eliminate reflections. This localized treatment resolves the contradiction between maintaining imaging quality and eliminating parasitic reflections.
2Object-affected harmful factors
If complex systems are used to reduce ghost image effects, then ghost images are reduced, but the quality of the final output is degraded and device complexity increases
Solution Approach 1:
The patent extracts and treats only the specific source of ghost images (the peripheral faces of the light guide plate) with light-absorbing material, rather than implementing complex systemic solutions. This targeted approach reduces ghost images while maintaining system simplicity.
Solution Approach 2:
The patent changes the optical parameter (reflectivity) of the peripheral faces by applying light-absorbing material, transforming them from reflective surfaces to absorptive surfaces. This simple parameter change effectively eliminates ghost images without increasing system complexity.
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 effectively reduces ghost images and enhances the sharpness and quality of the holographic 3D lighting effect by minimizing undesired reflections and improving the absorption of stray light rays, thereby improving the overall performance of the automotive lighting system.
Implementation Method 1
the at least one peripheral face of the surface guide is provided and/or made with one or more layer of light absorbing materials
Implementation Method 2
guiding face of the surface guide of the luminous device propagates the at least one part of the light rays emitted by the at least one light source by means of internal reflection towards the patterned portion
Implementation Method 3
Each pixel of this structure is supposed to see only light rays with given incidence angles, calculated with respect to the system geometry and based on the same light is diffracted to form a specific holographic 3D effect
Data Source
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AI summary
The present invention relates to a luminous device (100) for an automotive vehicle for producing holographic 3D effect. The luminous device (100) comprises a light source (10) configured for emitting light rays, a surface guide (200) having a patterned portion (20), a peripheral face (22) and a guiding face (24). The guiding face is configured for guiding he light rays emitted by the light source towards the patterned portion of the surface guide. The luminous device is further provided with a layer of light absorbing material (14) along the peripheral face of the surface guide to reduce the ghost image generation.