Light-emitting Device Series-Parallel Circuit Topology
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Solution Overview
Problem
Existing LED lighting fixtures lack efficient light emission techniques, necessitating a new approach for high-output lighting devices with insulating substrates and multiple light-emitting elements.
Innovation Solution
A light-emitting device with a phosphor layer on an insulating substrate, where light-emitting elements are connected in series and arranged in parallel, utilizing a phosphor layer that excites light in the visible spectrum, enhancing light emission efficiency and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple light-emitting elements are mounted on a substrate, then light output can be increased, but light emission efficiency deteriorates due to lack of optimized light extraction and distribution structures
Solution Approach 1:
The patent segments the light-emitting elements into multiple serial bodies arranged in parallel, with each body containing multiple LED chips connected in series. This segmentation allows independent optimization of light extraction for each body while maintaining high overall output, resolving the contradiction between increased power and efficiency
Solution Approach 2:
The patent applies local quality by positioning phosphor layers specifically on the substrate beneath each serial body, and by arranging anode sides uniformly on one side of the substrate. This localized optimization enhances light emission efficiency in critical areas while maintaining high overall power output
2Power
If light-emitting elements are arranged densely to increase output, then power increases, but device complexity increases due to wiring and heat management
Solution Approach 1:
The patent merges multiple LED chips into serial bodies connected in series, reducing the number of independent circuit connections needed. By arranging multiple serial bodies in parallel with uniform anode positioning, the patent simplifies the overall circuit architecture while maintaining high power output, effectively resolving the complexity issue
3Illumination intensity
If phosphor layer is added for color conversion, then color quality improves, but device complexity increases due to additional layers and materials
Solution Approach 1:
The patent makes the substrate multi-functional by using it both as the mechanical support structure and as the carrier for phosphor layers. This universal use of the substrate eliminates the need for separate color conversion components, improving color quality while avoiding increased device complexity
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 enables efficient light emission and realizes a high-output lighting device with improved light distribution and color adjustment capabilities.
Implementation Method 1
the light-emitting substrate has a phosphor layer which is provided on one surface side of the insulating substrate and which includes a phosphor in which a light emission peak wavelength is in a visible light region when light emitted from at least one of the light-emitting elements is used as excitation light
Data Source
AI summary
A light-emitting device has a light-emitting substrate having a circuit pattern layer over one surface of an insulating substrate and a plurality of light-emitting elements bonded to the circuit pattern layer, the light-emitting substrate has a phosphor layer on one surface side of the insulating substrate and includes a phosphor wherein the light emission peak wavelength is in a visible light region when the light emission of at least one of the light-emitting elements is used as excitation light, the elements have a plurality of serial bodies wherein the light-emitting elements are connected in series and arranged in parallel from an inner to an outer side of the substrate surface when the substrate surface of the light-emitting substrate is viewed from a top surface, and anode sides of the serial bodies are arranged on the same side of either the inner or the outer side of the substrate surface.