Multi-cell LED Brightness Deviation Reduction
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Solution Overview
Problem
Conventional AC-driven LED lighting apparatuses suffer from brightness deviation and luminous flux deviation due to sequential driving of LED groups, which complicates circuit design and increases manufacturing costs, as they require separate circuits for DC power conversion in AC environments.
Innovation Solution
An AC-driven LED lighting apparatus using a multi-cell LED configuration, where each multi-cell LED includes multiple light emitting cells connected in series, allowing independent control and sequential driving based on rectified voltage levels, with an LED driving module controlling current paths to manage power distribution and dimming levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LEDs are used in AC-driven lighting apparatus with sequential driving of LED groups, then the apparatus can be driven by AC power, but brightness deviation and luminous flux deviation occur among different LED groups
Solution Approach 1:
The invention divides each LED into multiple cells (first cell, second cell, third cell) with different forward voltages. By segmenting the LED and applying different voltages to different cells simultaneously, the patent eliminates brightness deviation among LED groups while maintaining AC power compatibility through the full-wave rectification circuit.
2Use of energy by moving object
If conventional LED groups are sequentially driven according to voltage levels, then power consumption is managed, but circuit design becomes complicated and manufacturing costs increase
Solution Approach 1:
The invention merges multiple LED cells into a single multi-cell LED component that can be directly connected to the full-wave rectification circuit. This integration eliminates the need for complex sequential driving circuits while maintaining power consumption control through voltage-level-based cell activation.
3Power
If LED groups are turned on/off based on voltage thresholds, then power distribution is controlled, but luminous flux deviation occurs between different LED groups
Solution Approach 1:
The invention applies different voltage levels to different cells within the same LED component, creating local quality differences that result in proportional luminous output. The first cell receives higher voltage and emits more light, while the second and third cells receive lower voltages and emit proportionally less light, achieving uniform overall luminous flux without deviation.
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 solution enables independent control of light emitting cells, reduces brightness and luminous flux deviations, and allows for seamless AC power utilization without additional DC conversion circuits, enhancing the efficiency and applicability of LED lighting systems.
Implementation Method 1
a rectification unit connected to an AC power source and supplying a rectified voltage to the LED light emitting module through full-wave rectification of AC voltage supplied from the AC power source
Implementation Method 2
an LED light emitting module including m multi-cell LEDs each including n light emitting cells, the LED light emitting module emitting light upon receiving the rectified voltage
Implementation Method 3
each including n light emitting cells, the LED light emitting module emitting light upon receiving the rectified voltage
Data Source
AI summary
A light-emitting diode (LED) lighting apparatus includes a rectification unit connected to an alternating current (AC) power source, and an LED light emitting module including m multi-cell LEDs each having n light emitting cells, kth light emitting cells of the respective m multi-cell LEDs being connected to each other in series to form a kth light emitting cell group, n being a positive integer of 2 or greater, m being a positive integer of 1 or greater, and k being a positive integer from 1 to n. The rectification unit is configured to supply a rectified voltage to the LED light emitting module through full-wave rectification of an AC voltage from the AC power source. The LED light emitting module is configured to emit light upon receiving the rectified voltage from the rectification unit, and to control sequential driving of first to nth light emitting cell groups according to a voltage level of the rectified voltage.