Fly-Eye LED Light Source Layout for Side Lobe Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting diode (LED) systems face challenges in optimizing energy utilization rates due to the generation of side lobes in the angular distribution of light beams, leading to energy loss.
Innovation Solution
A light source system comprising an array of LED chips, a collimating lens group, and a fly-eye lens with micro lens units, where the image formed by each LED chip is confined within a micro lens unit, reducing side lobes and enhancing energy utilization by controlling the light beam's angular distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional LED systems are used without precise image control, then the system structure is simple, but side lobes are generated in the angular distribution of light beams, leading to energy loss
Solution Approach 1:
The fly-eye lens is divided into multiple micro lens units, each corresponding to one or more LED chips. This segmentation allows precise control of light from each LED chip through dedicated micro lens units, confining images within individual micro lens units to reduce side lobes and improve energy utilization while maintaining manageable system complexity through modular design
Solution Approach 2:
Different regions of the fly-eye lens have different micro lens units tailored to correspond to specific LED chips. The collimating lens group provides localized collimation for each LED chip before light reaches the fly-eye lens. This local quality approach ensures optimal light control for each LED chip while maintaining overall system simplicity
Solution Approach 3:
The collimating lens group performs preliminary collimation of light beams from LED chips before the light reaches the fly-eye lens. This preliminary action prepares the light in an optimal state for subsequent processing by the micro lens units, reducing the need for complex adjustments later and improving overall energy utilization
2Loss of energy
If the image of LED chips is not confined within micro lens units, then the system is easier to manufacture, but side lobes are generated in the angular distribution, reducing energy utilization
Solution Approach 1:
The patent optimizes parameters such as the focal length of collimating lenses, the distance between LED chips and the fly-eye lens, and the pitch of micro lens units to ensure images are confined within micro lens units. By carefully controlling these parameters, the system achieves precise image positioning without requiring excessively complex manufacturing processes
Solution Approach 2:
The fly-eye lens creates multiple images of LED chips through its array of micro lens units. Each micro lens unit acts as a copy mechanism, forming an image of the corresponding LED chip within its boundaries. This copying approach simplifies the overall optical design while achieving the desired image confinement for reduced side lobes
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 effectively improves energy utilization rates by minimizing side lobes, achieving energy utilization rates up to 100% by ensuring the light beam image is contained within the micro lens units, thereby optimizing energy efficiency.
Implementation Method 1
a collimating lens group located on a light path of light emitted by the array of the light-emitting diodes, the collimating lens group being configured to collimate light beams emitted by the light-emitting diode chips
Implementation Method 2
a fly-eye lens arranged on a light path of light outputted from the collimating lens group. The fly-eye lens includes micro lens units corresponding to the light-emitting diode chips, and an image formed by each of the at least one light-emitting diode chip on surfaces of the micro lens units is completely within a surface of one of the micro lens units
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A light source system (100) and a light-emitting device, the light source system (100) comprising a light-emitting diode array (20), the light-emitting diode array (20) comprising a plurality of light-emitting diode chips (21); a collimating lens group (30), positioned on the emergent light path of the light-emitting diode array (20) and used for collimating the light beams emitted by the light-emitting diode chips (21); and a fly-eye lens (10), arranged on the emergent light path of the collimating lens group (30) and comprising a plurality of micro lens units (11) corresponding to the light-emitting diode chips (21), the image formed by at least one light-emitting diode chip (21) on the surface of a micro lens unit (11) being fully located within the surface of the micro lens unit (11). The present light source system (100) and light-emitting device reduce the proportion of side lobes on the angular distribution of the light beams emitted by the light-emitting diode chips (21) after passing through the micro lens units (11), reducing the energy ratio of side lobes to the total energy of the light beams, and effectively increasing the rate of energy utilisation of the light source system (100).