Holographic Projector Using Rotating Diffuser for Full-Color Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing holographic projection systems for vehicles require multiple laser sources and spatial light modulators for each color channel, leading to increased complexity, weight, cost, and space requirements.
Innovation Solution
A holographic projection system utilizing a single wavelength laser source, a spatial light modulator, and a rotating diffuser with regions coated with different down conversion materials to generate multiple colors, reducing the need for multiple laser sources and SLMs by employing a time-sequential hologram encoding and diffuser rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple laser sources and spatial light modulators are used for each color channel, then full color holographic projection is achieved, but device complexity increases
Solution Approach 1:
The patent combines multiple color generation functions into a single spatial light modulator by using a rotating diffuser with different down-conversion materials. Instead of having separate SLMs for each color channel, one SLM handles all colors sequentially through time-sequential hologram encoding, reducing the number of components while maintaining full color capability
Solution Approach 2:
The patent introduces a rotating diffuser that dynamically switches between different down-conversion materials (yellow, cyan, magenta) at different angular positions. This dynamic rotation allows a single SLM to serve multiple color channels by presenting the appropriate diffuser region to the light beam at the correct time, enabling full color projection without multiple static SLMs
2Adaptability or versatility
If multiple laser sources and spatial light modulators are used for each color channel, then full color holographic projection is achieved, but weight increases
Solution Approach 1:
The patent merges multiple heavy components (multiple laser sources and multiple SLMs) into a single integrated system with one SLM and a rotating diffuser. This consolidation significantly reduces the overall weight of the projection system while preserving full color holographic projection capability through time-sequential processing
3Adaptability or versatility
If multiple laser sources and spatial light modulators are used for each color channel, then full color holographic projection is achieved, but cost increases
Solution Approach 1:
The patent combines multiple expensive components into a single SLM and a relatively simple rotating diffuser assembly. This reduction in component count directly lowers manufacturing costs, making the system more economically viable while maintaining full color projection capabilities through intelligent time-sequential control
Solution Approach 2:
The rotating diffuser acts as an intermediary element that enables a single SLM to serve multiple color channels. By placing different down-conversion materials on the diffuser at different angular positions, the system achieves multi-color functionality without needing multiple SLMs, thereby reducing cost
4Adaptability or versatility
If multiple laser sources and spatial light modulators are used for each color channel, then full color holographic projection is achieved, but space requirements increase
Solution Approach 1:
The patent consolidates multiple color channel components into a single compact SLM and rotating diffuser assembly. This merging eliminates the need for separate SLMs for each color channel, significantly reducing the spatial footprint of the projection system while maintaining full color capability through time-sequential hologram encoding
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 system achieves full color holographic projection with reduced component count, weight, and cost, while maintaining efficient image display capabilities.
Implementation Method 1
two or more of the regions include respective down conversion materials, and where each of the respective down conversion materials convert a color of the second light beam to another color
Data Source
AI summary
A holographic projection system includes: a light source configured to generate a first light beam; a spatial light modulator configured to receive the first light beam and project a second light beam; a diffuser configured to rotate and including multiple regions, where two or more of the regions include respective down conversion materials, and where each of the respective down conversion materials convert a color of the second light beam to another color; and at least one control module configured to generate an image, encode the spatial light modulator with multiple holograms to generate the second light beam including instances of the image, and control rotation of the diffuser to display and overlay the instances of the image to provide a resultant image.