LED Module Chroma Uniformity via Mixed Chip Sizes
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Solution Overview
Problem
Conventional LED modules suffer from non-uniform chroma and glare due to direct light emission from LED chips, leading to increased module size and reduced color render index, especially when attempting to create a white light source using LEDs of different colors.
Innovation Solution
A light emitting device with a substrate hosting a combination of large and small LED chips of varying dominant wavelengths, where the smaller chips are placed in peripheral regions and larger chips in central regions, along with a fluorescent layer to enhance light mixing and chroma uniformity, and an optical lens to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED chips of different colors are configured in an array on the carrier for packaging to generate white LED light source, then the white light source is achieved, but the module size is increased due to large light mixing area needed
Solution Approach 1:
The patent combines multiple LED chips of different colors (red, green, blue) and different sizes onto a single carrier substrate, merging their light output functions. The optical lens integrates the light from these different chips, combining their functions into a unified illumination system that generates white light without requiring separate mixing areas for each color channel.
Solution Approach 2:
The patent utilizes different spatial dimensions on the carrier substrate by placing LED chips of different sizes at different locations. Larger chips are positioned in certain regions while smaller chips occupy other regions, effectively using the two-dimensional carrier area to accommodate multiple chips without requiring excessive light mixing space, thus reducing overall module size.
2Use of energy by moving object
If an optical lens is configured in the LED module to utilize light beam effectively, then light utilization is improved, but the illumination angle becomes too small or focused at a certain region due to different refraction angles of different colors
Solution Approach 1:
The patent applies the local quality principle by strategically positioning LED chips of different colors and sizes at different locations on the carrier substrate. Larger chips are placed in regions where their light output can be effectively utilized, while smaller chips are positioned in other regions. This spatial differentiation ensures that each chip's light contributes optimally to the overall illumination, maintaining uniform chroma distribution across different viewing angles while preserving high light utilization efficiency through the optical lens.
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 solution achieves favorable chroma uniformity and efficient light utilization, reducing module size while improving color render index and light distribution, effectively addressing the issues of non-uniformity and glare in conventional LED modules.
Implementation Method 1
a fluorescent layer, disposed on the substrate, converting a portion of light of the first LED chips to generate a fluorescent light
Data Source
AI summary
A light emitting module including a substrate, a plurality of first light emitting diode (LED) chips and a plurality of second LED chips is provided. The substrate has a cross-shaped central region and a peripheral region surrounding the cross-shaped central region. The first LED chips are disposed on the substrate and at least located in the cross-shaped central region. The second LED chips are disposed on the substrate and at least located in the peripheral region. A size of each second LED chip is smaller than a size of each first LED chip. The number of the first LED chips located in the peripheral region is smaller than that in the cross-shaped central region. The number of the second LED chips located in the cross-shaped central region is smaller than that in the peripheral region.