Integrated LED Driver Chip for Compact Panel Lighting
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Solution Overview
Problem
Conventional LED driving circuits require a large board area, numerous external devices, and complex assembly processes, leading to higher costs and lower compactness, especially when dimming control is needed for brightness adjustment.
Innovation Solution
An integrated LED driving device that combines DC/DC conversion, constant current control, and control logic into a single chip, enabling wireless or external control signals to manage multiple LED arrays with pulse width modulation and protective circuits for overcurrent/overvoltage protection, and supports multi-channel and phase difference control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If various LED driving circuits (DC-DC converter, constant current control, dimming control) are implemented using individual lumped devices, then each circuit can be independently designed and assembled, but the board area required increases significantly and assembly complexity increases
Solution Approach 1:
The patent integrates the DC-DC converter, constant current control circuit, and dimming control circuit into a single integrated circuit chip. This merging of previously separate circuits eliminates the need for multiple discrete components, thereby significantly reducing the board area required while maintaining all necessary LED driving functions.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: DC-DC voltage conversion, constant current control for LED arrays, and PWM dimming control. This multi-functional design consolidates what were previously separate specialized circuits into one universal controller, reducing overall system complexity and board space.
2Adaptability or versatility
If multiple individual devices are used for LED driving circuits, then circuit functionality is comprehensive, but the number of external devices increases and assembly defect ratio increases
Solution Approach 1:
The patent combines multiple functional circuits (DC-DC converter, constant current control, PWM dimming control) into a single integrated circuit chip. This integration maintains comprehensive LED driving functionality while reducing the number of external devices from multiple separate components to one unified controller, thereby simplifying the overall system.
3Ease of manufacture
If conventional separate circuits are used for LED driving, then each circuit can be optimized independently, but manufacturing cost increases and compactness decreases
Solution Approach 1:
The patent integrates multiple LED driving circuits into one chip, which reduces manufacturing costs by eliminating the need for multiple separate components and their associated assembly processes. The integrated design also improves compactness by consolidating all circuit functions into a single device, directly addressing the productivity and cost issues.
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 results in a more compact, cost-effective, and reliable LED driving solution with reduced defect ratios, allowing for precise brightness and color control of LED arrays, suitable for smaller-sized LCD panels.
Implementation Method 1
a direct current (DC)/direct current (DC) converting part converting and outputting a DC voltage inputted from the outside by switching of a switch into a driving voltage
Implementation Method 2
a pulse width modulation controller pulse width modulation-controlling a switching duty of the switch of the DC/DC converting part and controlling a switching duty of each of the switches of the switching part
Data Source
AI summary
There is provided an integrated LED driving device including: a DC/DC converting part converting and outputting a DC voltage inputted from the outside by switching of a switch into a driving voltage of a magnitude suitable for driving a plurality of LED arrays; a constant current controlling part receiving at least one of information on the current flowing through the LED array and information on a voltage applied to the LED array by feed-back, the constant current controlling part including a PWM controller PWM-controlling a switching duty of the switch of the DC/DC converting part, and controlling a switching duty of each of the switches of the switching part to allow the current to flow through the LED array with a predetermined magnitude; and a control logic receiving a control signal by a user and controlling the PWM controller in response to the control signal.