AC Light Emitting Diode with 2D Cell Arrays
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Solution Overview
Problem
Light emitting diodes (LEDs) connected directly to an AC power source face issues with continuous operation due to reverse current damage and low operating voltage, making them unsuitable for general illumination and increasing the size and complexity of lighting systems when multiple LEDs are connected in parallel.
Innovation Solution
A single chip AC LED with light emitting cells arranged two-dimensionally on a substrate, connected via wires to form serial arrays that can operate under AC power, incorporating a bridge rectifier and shunt wires to prevent overvoltage, with optimized spacing between cells to balance voltage and reduce flicker and etching damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rectifier is positioned between the light emitting diode and AC power source to rectify AC current into DC current, then the light emitting diode can operate under AC power source, but the device complexity increases due to the additional rectifier component
Solution Approach 1:
The patent combines multiple light emitting diodes and rectifier functions into a single integrated chip structure. The light emitting diodes are arranged in specific configurations (series and parallel combinations) directly on the chip, eliminating the need for external rectifier components and wire connections, thus reducing device complexity while maintaining AC power source compatibility
2Adaptability or versatility
If a plurality of light emitting diodes are connected in reverse parallel to connect directly to high-voltage AC power source, then the light emitting diodes can be connected directly to AC power source, but the overall size of the light emitting device increases
Solution Approach 1:
The patent nests multiple light emitting diodes and their interconnections within a single chip substrate. The diodes are arranged in a compact two-dimensional layout with integrated wiring, effectively nesting the entire AC-compatible circuitry within the chip boundaries, thus minimizing the overall device size while enabling direct AC power source connection
3Device complexity
If light emitting diodes are connected directly to AC power source, then the structure is simplified, but the light emitting diode cannot continuously emit light and may be easily damaged due to reverse current
Solution Approach 1:
The patent segments the chip into multiple light emitting diodes arranged in specific series-parallel configurations. This segmentation allows the circuit to handle AC power source characteristics (including reverse current) while enabling continuous light emission, as different diode segments operate during different phases of the AC cycle
4Area of stationary object
If light emitting cells are spaced apart by distance less than 10 μm, then the chip size is reduced, but current leakage occurs between the light emitting cells
Solution Approach 1:
The patent optimizes the spacing distance between light emitting cells to a specific range (10-30 μm) that balances chip size reduction with prevention of current leakage. This local quality optimization ensures adequate isolation between cells while maintaining compact dimensions
5Reliability
If light emitting cells are spaced apart by distance greater than 30 μm, then current leakage is prevented, but the turn-on and operating voltages increase and operating time is reduced
Solution Approach 1:
The patent optimizes the spacing parameter between light emitting cells to a specific range (10-30 μm) that balances multiple competing requirements: preventing current leakage while maintaining acceptable turn-on and operating voltages for adequate operating time under AC power source
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 continuous operation of AC LEDs connected to a single chip, reducing size and complexity, increasing light output, and minimizing flicker and etching damage while preventing overvoltage and current leakage.
Implementation Method 1
Light emitting diodes are an electroluminescence device having a structure in which n-type and p-type semiconductors are joined together, and emit predetermined light through recombination of electrons and holes
Implementation Method 2
a method of positioning a rectifier between a light emitting diode and an AC power source to rectify AC current into DC current
Data Source
AI summary
Disclosed herein is an AC light emitting diode. The light emitting diode comprises a plurality of light emitting cells two-dimensionally arranged on a single substrate. Wires electrically connect the light emitting cells to one another to thereby form a serial array of the light emitting cells. Further, the light emitting cells are spaced apart from one another by distances within a range of 10 to 30 D, and the serial array is operated while connected to an AC power source. Accordingly, the excellent operating characteristics and light output power can be secured in an AC light emitting diode with a limited size.