Integrated LED Driving Circuit for RGB Color Multiplexing
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Solution Overview
Problem
LED display devices require multiple driving circuits for three colors (R/G/B) LEDs, leading to high space occupation and circuit costs due to the complexity and size of the necessary components.
Innovation Solution
An LED driving circuit with a first LED driving unit that includes a duty cycle circuit, a current control circuit, and a constant current circuit, which generates enable signals and current adjustment signals to control the emitting cycles and current levels of two color LEDs, reducing the number of required driving units and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate driving circuits are used for each color LED (R/G/B), then each LED can be controlled independently with optimal performance, but the circuit complexity and space occupation increase significantly
Solution Approach 1:
The patent combines multiple color LED driving functions into a single integrated driving circuit. The circuit uses a unified current control circuit and constant current circuit that can sequentially drive different color LEDs (R/G/B) through multiplexed control signals, eliminating the need for separate dedicated driving circuits for each color channel.
Solution Approach 2:
The driving circuit is designed with universal functionality to control multiple color LEDs using the same core components. The current control circuit and constant current circuit can adapt to different color LEDs through configuration of control signals and timing parameters, making the circuit multi-functional rather than requiring separate specialized circuits.
2Reliability
If separate driving circuits are used for each color LED (R/G/B), then each LED can be controlled independently with optimal performance, but the space occupation in the device increases
Solution Approach 1:
The patent merges multiple color LED driving functions into a single integrated driving circuit. The circuit uses a unified current control circuit and constant current circuit that can sequentially drive different color LEDs through multiplexed control signals, significantly reducing the PCB area and component count compared to having separate dedicated driving circuits for each color channel.
3Device complexity
If a simplified driving circuit is used to reduce space and cost, then circuit complexity decreases, but achieving precise constant current control for multiple colors becomes more difficult
Solution Approach 1:
The patent incorporates a constant current circuit with feedback control mechanisms that monitor the actual current flowing through the LEDs and adjust the driving signals accordingly. This feedback system ensures precise constant current control is maintained even though the overall circuit structure is simplified and integrated, resolving the trade-off between circuit simplicity and control precision.
Data Source
AI summary
A light emit diode (LED) driving circuit, an LED driving method and a display device thereof are provided. The LED driving circuit includes: a first LED driving unit for driving first and second color LEDs of the LED circuit. The first LED driving unit includes: a duty cycle circuit generating an enable signal based on at least two color light duty cycle signals, the at least two color light duty cycle signals controlling an emitting cycle of the LED circuit; a current control circuit, generating at least two color light current adjustment signals based the at least two color light duty cycle signals and at least two color light current level signals; and a constant current circuit, for adjusting current levels of the first and the second color LEDs of the LED circuit based on the enable signal and the at least two color light current adjustment signals.