LED Array Thermal Management via Localized Element Count
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Solution Overview
Problem
Conventional light-emitting devices with LED elements experience heat generation disparities across the substrate, leading to uneven temperature distribution, premature deterioration, and color tone changes, particularly affecting the central diode packages which suffer from the highest heat accumulation.
Innovation Solution
The design features a substrate with alternating and parallel electrode strips and light-emitting arrays, where the central light-emitting array has the most LED elements, and the number of LED elements decreases towards the ends, along with a heat-release mechanism using a metal plate and elongated holes to manage heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple diode packages are arranged on a single substrate to achieve high brightness, then the light-emitting efficiency is improved, but heat generation disparity and temperature distribution uniformity deteriorate
Solution Approach 1:
The patent applies local quality by varying the number of LED elements in different light-emitting arrays based on their position. The central array has more LED elements (6 elements) while edge arrays have fewer (4 elements), creating non-uniform local characteristics that compensate for heat accumulation patterns. This localized differentiation resolves the temperature uniformity issue while maintaining overall high light-emitting efficiency.
Solution Approach 2:
The patent changes the parameter of LED element quantity across different arrays. By adjusting the number of LED elements from 4 in edge arrays to 6 in the central array, the patent modifies the heat generation parameters locally to achieve uniform temperature distribution across the substrate while preserving high overall light-emitting efficiency.
2Illumination intensity
If the number of LED elements is increased in central arrays to compensate for heat accumulation, then the brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent segments the light-emitting device into multiple independent light-emitting arrays (first, second, third, and fourth arrays) with different numbers of LED elements. This segmentation allows each array to be optimized independently for its specific thermal environment, achieving brightness uniformity across the entire device while keeping the overall structure relatively simple and modular.
3Ease of operation
If all LED elements are connected in parallel with equal current flow, then the ease of operation is improved, but the heat generation uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating different local configurations of LED elements in different arrays. The central arrays have more LED elements (6 elements) while edge arrays have fewer (4 elements), resulting in localized variations in heat generation that compensate for positional heat accumulation differences, achieving uniform temperature distribution while maintaining simple parallel connection for ease of operation.
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 maintains a stable and uniform temperature across the device, reducing heat generation at the central portion, prolonging the device's service life and maintaining consistent color tone by evenly distributing heat and current flow.
Implementation Method 1
a heat-release mechanism using a metal plate and elongated holes to manage heat distribution
Data Source
AI summary
A light-emitting device includes a substrate, and a plurality of light-emitting arrays or light-emitting groups arranged on the substrate. The light-emitting arrays or light-emitting groups include a plurality of LED elements connected in parallel with a pair of adjacent electrodes. The number of the LED elements constituting each of the light-emitting arrays or the light-emitting groups differs in each of the light-emitting arrays or the light-emitting groups. Of the plurality of light-emitting arrays arranged in parallel with each other or the light-emitting groups arranged in a line, the number of the LED elements of the light-emitting arrays or the light-emitting groups positioned inside the substrate is more than the number of the LED elements of the light-emitting arrays or the light-emitting groups positioned outside the substrate.