Light Source Module with Depth-Varied LED Placement
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Solution Overview
Problem
The light emitting efficiency of LED-based light source modules is compromised due to the absorption of green and blue light by red phosphors, leading to reduced luminance and color accuracy in display devices.
Innovation Solution
Spatial separation of light sources and phosphors within a light source module, where blue and green LEDs are positioned at different depths within a receiving container, with a refractive index difference between the resins covering them, minimizing the absorption of green light by the red phosphor, and ensuring they are in the same thermal space for reliable color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red phosphor is used to convert blue light to red light, then white light can be generated, but green light is also absorbed by the red phosphor, reducing light emitting efficiency
Solution Approach 1:
The patent divides the light source module into separate regions: a first light source (blue LED) positioned closer to the phosphor for red light generation, and a second light source (green LED) positioned farther away. This spatial segmentation allows the green LED to emit green light without significant absorption by the red phosphor, while the blue LED efficiently generates red light through phosphor conversion. The receiving container has different bottom surface depths at different locations to accommodate this segmented arrangement.
2Device complexity
If blue and green LED chips are placed at the same depth, then the structure is simple, but green light is absorbed by red phosphor reducing efficiency
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement (all LEDs at the same depth) to a three-dimensional arrangement with varying depths. The receiving container has a first bottom surface at a first depth and a second bottom surface at a second depth, allowing blue and green LED chips to be positioned at different vertical levels. This dimensional change enables optimized light paths while maintaining structural integration.
3Quantity of substance
If red phosphor absorbs green light, then more red light is generated, but overall luminance and color accuracy decrease
Solution Approach 1:
The patent applies different properties to different regions: the first resin containing red phosphor is positioned around the blue LED where red light generation is needed, while the second resin (without phosphor or with different phosphor) is positioned around the green LED where green light transmission is prioritized. This local differentiation ensures that green light passes through the green LED region with minimal absorption while red phosphor effectively converts blue light to red light in its designated region.
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 enhances light emitting efficiency and maintains reliable color coordinates, improving the luminance and color accuracy of the light source module, with the refractive index difference further optimizing green light transmission and absorption.
Implementation Method 1
The first resin includes a phosphor emitting third color light
Implementation Method 2
a refractive index difference between the resins covering them, minimizing the absorption of green light by the red phosphor
Data Source
AI summary
A light source module includes a receiving container, a first light source, a second light source, a first resin, and a second resin. The receiving container includes an upper surface, a first bottom surface, and a second bottom surface. The first bottom surface has a first depth from the upper surface. The second bottom surface has a second depth from the upper surface. The first light source is disposed on the first bottom surface. The first light source generates first color light. The second light source is disposed on the second bottom surface. The second light source generates second color light. The first resin is formed on the first light source. The first resin includes a phosphor emitting third color light. The second resin is formed on the first resin and the second light source.