AC Driven LED Connection Structure for High Efficiency
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Solution Overview
Problem
Existing AC-driven LED light emitting devices require additional circuits for DC conversion, leading to inefficiencies, increased costs, and complex configurations, with many LEDs being underutilized due to inefficient arrangements that result in low light emission efficiency and high electromagnetic interference.
Innovation Solution
An AC-driven light emitting device with a connection structure that optimizes the arrangement and interconnection of LED cells, allowing operation directly at AC voltage, featuring a substrate with first, second, and third LED cells arranged in specific rows and connections to ensure uniform current distribution and high light emission efficiency, while minimizing electrode interconnections and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional AC/DC converter circuits are used to drive LEDs at AC voltage, then LEDs can operate at normal AC voltage, but device complexity increases and electromagnetic interference worsens
Solution Approach 1:
The patent extracts and eliminates the AC/DC converter circuit from the LED driving system. By directly connecting LED strings to AC voltage through carefully designed series-parallel configurations and rectifier diodes, the complex conversion circuitry is removed entirely, reducing device complexity while maintaining AC voltage operation capability
Solution Approach 2:
The patent replaces the electronic AC/DC conversion mechanism with a direct electrical connection approach using rectifier diodes and LED string arrangements. This substitution eliminates switching components and complex control circuits, thereby reducing electromagnetic interference and simplifying the overall system
2Adaptability or versatility
If LEDs are arranged in reverse-parallel or bridge configuration for AC driving, then AC voltage can be utilized, but light emission efficiency decreases because only 50-60% of LEDs are actively emitting
Solution Approach 1:
The patent segments the LED array into multiple independent strings, each containing series-connected LEDs with rectifier diodes. This segmentation allows different strings to be activated during different half-cycles of AC voltage, ensuring continuous light emission and improving overall efficiency compared to reverse-parallel configurations
Solution Approach 2:
The patent implements dynamic switching of LED strings based on AC voltage polarity. During positive half-cycles, one set of strings is activated; during negative half-cycles, another set is activated. This dynamic arrangement ensures that LEDs are always forward-biased when needed, maximizing light emission efficiency while maintaining AC voltage compatibility
3Illumination intensity
If more LEDs are used to compensate for inefficient arrangement, then desired light output can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent ensures continuous useful action by arranging LED strings and rectifier diodes so that during each AC voltage half-cycle, current flows through active LED strings in the forward direction. This continuous forward biasing during both half-cycles maximizes the utilization of each LED, achieving desired light output with fewer LEDs and reducing manufacturing costs
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 achieves a higher light emission efficiency, reduces the number of LEDs required, simplifies the configuration, and enhances the degree of integration, resulting in improved cost efficiency and reduced electromagnetic interference.
Implementation Method 1
K number of first light emitting diode (LED) cells arranged in a row on a top surface of the substrate
Data Source
AI summary
An alternating current (AC) driven light emitting device includes a substrate, K number of first light emitting diode (LED) cells arranged in a row on a top surface of the substrate, where K is an integer satisfying K≧3, K number of second LED cells arranged in a row parallel to the row of the first LED cells on the top surface of the substrate, and (K−1) number of third LED cells arranged in a row between the respective rows of the first and second LED cells on the top surface of the substrate. The AC driven light emitting device has a connection structure between LED cells to be operable at an AC.