SSL Emitter Array Layout for Uniform Edge-to-Center Illumination
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Solution Overview
Problem
Conventional solid state lighting (SSL) devices with uniform LED distributions suffer from non-uniform light intensity distribution, resulting in reduced quality, particularly with greater intensity at the center and less at the edges, leading to dark spots and inefficiencies.
Innovation Solution
The arrangement of SSL emitters with varying densities, spacing, sizes, and coverage area ratios in different regions of the emitter array, such as central and peripheral areas, to achieve a more uniform light output without the need for diffusion films, which reduce overall efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform LED distribution is used in SSL devices, then the device structure is simple and easy to manufacture, but the light intensity distribution becomes non-uniform with dark spots at edges
Solution Approach 1:
The patent applies local quality by varying LED parameters (size, spacing, density, coverage area ratio) in different regions of the emitter array. Specifically, peripheral LEDs have different characteristics than central LEDs to compensate for the natural light falloff at edges, creating non-uniform local properties that result in uniform overall illumination.
2Illumination intensity
If diffusion films are used to reduce non-uniformity in conventional multi-LED devices, then the light intensity distribution becomes more uniform, but the overall light output and efficiency are reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring the LED emitter array with non-uniform spacing, sizes, and densities before light emission occurs. This proactive design compensates for expected light falloff patterns, eliminating the need for reactive diffusion films that would attenuate light and reduce efficiency.
3Device complexity
If the LED spacing is increased to reduce complexity, then the device structure is simpler, but the light output uniformity deteriorates with more pronounced dark spots
Solution Approach 1:
The patent applies parameter changes by systematically varying multiple LED parameters including spacing distances, LED sizes, densities, and coverage area ratios across different regions of the array. These coordinated parameter variations achieve uniform light output without requiring overly complex structures.
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 approach results in a highly uniform light output across the array, reducing dark spots and maintaining high efficiency by optimizing emitter placement and spacing to ensure consistent illumination.
Implementation Method 1
the LED 4 emits blue light that stimulates the converter material 6 to emit light at a desired frequency (e.g., yellow light)
Data Source
AI summary
Solid state lighting (SSL) devices and methods of manufacturing such devices. One embodiment of an SSL device comprises a support and an emitter array having a plurality of SSL emitters carried by the support. The emitter array has a central region and a peripheral region outward from the central region. Individual SSL emitters in both the central and the peripheral regions have a primary emission direction along which an intensity of light from the SSL emitters is highest, and the primary emission direction of the SSL emitters in the central region is at least substantially the same direction as the primary emission direction of the SSL emitters in the peripheral region. Additionally, a first coverage area ratio of the SSL emitters in the central region is different than a second coverage area ratio of the SSL emitters in the peripheral region.