LED Module Recesses Prevent Total Internal Reflection
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Solution Overview
Problem
Total reflection within LED modules reduces light-extraction efficiency, which is a significant challenge in the field of light emitting diode technology.
Innovation Solution
The integration of refractive parts, such as metal surfaces with specific angles and positions on the circuit board, and the use of an encapsulant with photoluminescence properties, helps to enhance light extraction by optimizing the geometry of the LED module and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED chips are arranged in a conventional configuration without recesses, then the device structure is simple, but total reflection occurs reducing light-extraction efficiency
Solution Approach 1:
The circuit board is segmented with multiple recesses (first recesses and second recesses) that divide the LED chip arrangement into distinct zones. These recesses create separate optical paths and prevent total reflection by breaking the continuous interface between different refractive index regions, thereby improving light extraction efficiency while maintaining manufacturing simplicity.
Solution Approach 2:
Recesses are strategically positioned at specific locations where total reflection occurs, creating local optical optimization zones. The recesses are placed between adjacent LED chips and at specific distances from chip edges to locally modify light propagation paths without requiring complete redesign of the entire device structure.
2Loss of energy
If recesses are added to the circuit board to reduce total reflection, then light-extraction efficiency improves, but device complexity increases
Solution Approach 1:
The recess structure is segmented into two types (first recesses and second recesses) with different positions and functions. First recesses are located between adjacent LED chips at specific distances from chip edges, while second recesses are positioned elsewhere on the circuit board. This segmentation allows optimization of light extraction at critical locations without unnecessarily complicating the entire device structure.
Solution Approach 2:
The recesses have specific geometric parameters (depth, width, positioning distances) that are optimized to control light reflection and refraction. By carefully controlling these parameters, the patent achieves improved light extraction efficiency without requiring excessive structural complexity. The recess depth and positioning are precisely defined to create the desired optical effects with minimal structural intervention.
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 configuration significantly improves the light-extraction efficiency of the LED module by reducing total reflection and enhancing the distribution of light, leading to improved performance.
Implementation Method 1
an encapsulant with photoluminescence properties, enhancing light extraction by optimizing the refractive index and surface interactions
Implementation Method 2
enhancing light extraction by optimizing the refractive index and surface interactions
Data Source
AI summary
An light emitting diode (LED) module includes a circuit board, a plurality of LED chips arranged on and electrically connected to the circuit board, and an encapsulant arranged on the circuit board and covering the LED chips, a plurality of first recesses defined in a first surface of the circuit board.