Multi-state HOE Optical Switch for LED Light Engine Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical light engines struggle to efficiently combine and direct high-power multi-color light sources for large screen displays, particularly with LEDs, due to limitations in compactness, cost, and throughput efficiency compared to traditional arc-lamp systems.
Innovation Solution
The use of a multi-state photonic switch based on a holographic optical element (HOE) with Bragg grating principles, which is electronically switchable between 'field-off' and 'field-on' states, allowing for efficient transmission, reflection, or diffraction of light from red, green, and blue LEDs to achieve a broadband color response, integrated with collimation lenses and a dichroic reflector for improved light collection and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional arc-lamp light sources are used, then high power and large screen display capability are achieved, but cost, power consumption, and lifespan are worsened
Solution Approach 1:
The patent changes the fundamental parameter of the light source from arc-lamp to LED technology, enabling high power output with significantly reduced power consumption. The LED-based illumination module achieves comparable or superior luminous flux while consuming fraction of the power, directly resolving the contradiction between power output and energy efficiency
Solution Approach 2:
The patent replaces the mechanical arc-lamp system with a solid-state LED illumination system. This substitution eliminates the need for complex arc maintenance mechanisms and enables更高效 energy conversion, achieving high power output with lower power consumption and improved reliability
2Adaptability or versatility
If multiple color light sources are combined, then full color display capability is achieved, but device complexity and size increase
Solution Approach 1:
The patent employs a single holographic optical element that performs multiple functions: beam combining, wavelength separation, and color mixing. This multi-functional component consolidates what would otherwise require multiple separate optical elements, reducing system complexity while maintaining full color display capability
Solution Approach 2:
The patent merges multiple color light paths into a single common optical path using a holographic beam combiner. This consolidation integrates red, green, and blue LED outputs into one unified beam that illuminates the DMD device, simplifying the overall optical architecture while preserving color versatility
3Use of energy by stationary object
If LED light sources are used, then cost, lifespan, and power consumption are improved, but light collection efficiency and throughput are worsened
Solution Approach 1:
The patent utilizes the specific spectral characteristics of LEDs by implementing a holographic optical element tuned to the discrete wavelengths emitted by red, green, and blue LEDs. This wavelength-specific design maximizes light collection efficiency by matching the grating parameters to LED emission spectra, thereby improving throughput while maintaining LED power efficiency advantages
Solution Approach 2:
The patent employs an electronically switchable holographic optical element that can dynamically adjust its diffraction efficiency for different wavelengths. This dynamic control optimizes light collection for each LED color source independently, maximizing overall system throughput while preserving the energy efficiency benefits of LED operation
4Device complexity
If a holographic optical element is used, then compactness and simplicity are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the holographic grating parameters (spacing, orientation, depth) to match the specific wavelengths and geometries of commercial LED sources. This parameter optimization reduces sensitivity to manufacturing tolerances while maintaining high diffraction efficiency, thereby achieving compact design without excessive precision requirements
Solution Approach 2:
The patent employs cost-effective holographic fabrication methods that produce sufficient precision for practical applications without requiring ultra-precise manufacturing. The holographic optical element is designed to be replaceable and cost-efficient, balancing manufacturing precision requirements with overall system cost-effectiveness
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 solution enhances light engine efficiency, reduces size and cost, and simplifies design by enabling high-throughput, high-power LED light management for large screen displays, overcoming previous limitations in LED adoption for high-power applications.
Implementation Method 1
A multi-state photonic switch based on a holographic optical element (HOE) with Bragg grating principles
Implementation Method 2
integrated with collimation lenses and a dichroic reflector for improved light collection and distribution
Implementation Method 3
integrated with collimation lenses and a dichroic reflector for improved light collection and distribution
Data Source
AI summary
An image presentation device (100) incorporates an optical combiner (130) that utilizes a multi-state optical switch (131, 137) for use with a plurality of colored light sources (122, 124,126). The switch (131,137) includes an electronically switchable holographic optical element HOE (131) having a first and a second mode of operation. Light from first and second light sources (124, 126) passes through HOE (131) in a diffracted manner in at least one of the first and second modes of operation. Light from a third light source (122) is reflected by a reflector (137) in a third mode of operation. The combiner (130) operates to combine light from the various light sources (122, 124, 126) into a common light path.