Polarless Surface Mount LED with Segmented Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior art surface mounting light emitting diodes require a specific polarity connection, limiting their application and increasing circuit complexity and cost when operating at higher voltages, as incorrect connections result in non-operation and require external shunt resistors.
Innovation Solution
A polarless surface mounting light emitting diode design featuring a substrate with copper foil metal thin films, etched metal blocks, and chip resistors and LEDs connected in parallel via supersonic welding, allowing any end to be connected to a positive or negative electrode, with voltage adjustment using a silicon resistor chip formula VL=I·R+VF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prior art surface mounting light emitting diode is designed with P type and N type junction surfaces requiring predetermined polarity connection, then the diode can operate reliably in positive bias state, but the connection flexibility is reduced and circuit complexity increases when applied to higher voltages
Solution Approach 1:
The substrate is divided into four independent metal thin film blocks (first, second, third, and fourth blocks) instead of traditional two-pole connections. This segmentation allows multiple connection configurations, enabling the diode to adapt to different polarity connections and voltage conditions without requiring external components or complex circuit design.
Solution Approach 2:
The light emitting diode structure is designed to perform multiple functions: it can operate in positive bias mode (traditional operation), negative bias mode (reverse operation), and withstand high voltage conditions. The four metal blocks enable the same device to serve as a standard LED, a reverse-polarity LED, or a high-voltage indicator, eliminating the need for separate components.
2Adaptability or versatility
If a prior art surface mounting light emitting diode is connected with incorrect polarity, then the diode enters cut off mode and cannot light up, but this limits application flexibility
Solution Approach 1:
The invention enables the light emitting diode to operate in both positive bias mode (traditional P-type to positive electrode connection) and negative bias mode (N-type to positive electrode connection). By inverting the traditional connection requirement, the diode can light up regardless of polarity, eliminating the risk of incorrect connection and expanding application flexibility.
3Adaptability or versatility
If a prior art surface mounting light emitting diode is applied to higher voltage, then external shunt resistors must be connected, but this increases cost and device complexity
Solution Approach 1:
The invention integrates multiple functional capabilities into a single device structure. The four-metal-block configuration combines the functions of polarity adaptation, voltage withstanding, and light emission into one component, eliminating the need for external shunt resistors or voltage division circuits that would otherwise be required for high-voltage applications.
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
Enables flexible polarity connections, reduces circuit complexity, and allows operation at higher voltages without external components, achieving cost-effective and efficient production of compact, high-voltage capable diodes.
Implementation Method 1
a substrate having two surfaces which are adhered with copper foil metal thin films by thermal pressing
Implementation Method 2
By thermal supersonic welding technology, four conductive wires are welded respectively to electrically connect the chip resistor and the chip light emitting diode
Implementation Method 3
each light emitting assembly is formed by a chip light emitting diode and a chip resistor
Implementation Method 4
The diode is operated by positive bias so that the surface mounting light emitting diode can light up
Data Source
AI summary
A polarless surface mounting light emitting diode comprises a substrate; an upper surface of the substrate being etched with four independent metal thin film blocks; a lower surface of the substrate being formed with two independent metal thin film blocks; two ends of the substrate being formed with electroplated through holes; a plurality of metal thin films adhered upon the upper and lower surfaces of the substrate; two light emitting assemblies, each light emitting assembly being formed by a chip resistor and a chip light emitting diode; and a package layer. The connection of the polarless surface mounting light emitting diode of the present invention is not limited by the polarity. Any end of the polarless surface mounting light emitting diode can be connected to positive electrode or negative electrode.