LED Driving Circuit Adaptive Current Control
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Solution Overview
Problem
Current LED driving methods have fixed driving current, limiting adjustability and efficiency, as they operate LEDs at maximum luminance current in all conditions, leading to suboptimal performance.
Innovation Solution
A light emitting diode driving device and method that includes a duty cycle setting up unit, current setting up unit, and control unit to adjust duty cycle and current signals, allowing for adaptive operation of LEDs in high efficiency regions by varying duty cycles and current values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fixed maximum luminance current is used to drive LEDs, then maximum brightness is achieved, but driving efficiency decreases and adaptability to different conditions is limited
Solution Approach 1:
The patent implements dynamic current driving by switching between first and second driving currents based on different display regions. The control unit dynamically adjusts the driving current magnitude, transitioning from fixed to variable current control, thereby achieving adaptability to different display conditions while maintaining optimal LED efficiency in each region.
Solution Approach 2:
The patent applies different driving currents to different display regions (first display region uses first driving current, second display region uses second driving current). This local differentiation allows each region to operate at optimal current levels for its specific requirements, improving overall adaptability and efficiency.
2Illumination intensity
If fixed maximum luminance current is used to drive LEDs, then maximum brightness is achieved, but driving efficiency decreases
Solution Approach 1:
The patent changes the driving current parameter from a fixed maximum value to variable values (first driving current and second driving current with different magnitudes). By adjusting the current parameter according to different display regions and requirements, the system achieves optimal LED efficiency while maintaining necessary brightness levels, thereby reducing energy loss.
Solution Approach 2:
The patent applies partial action by using different current magnitudes for different regions rather than applying maximum current universally. The second driving current (lower magnitude) is sufficient for regions not requiring maximum brightness, avoiding excessive energy consumption while maintaining adequate display quality.
3Device complexity
If fixed driving current is used, then circuit design is simplified, but adjustability and convenience in different applications are limited
Solution Approach 1:
The patent introduces dynamic control capability through a control unit that can switch between different driving currents. This dynamic adjustment mechanism provides flexibility and adjustability for different applications while maintaining a relatively compact circuit structure, balancing complexity and operability.
4Illumination intensity
If first driving current with first duty cycle is applied during first period, then specific luminance is achieved, but continuous optimization requires multiple current levels
Solution Approach 1:
The patent segments the display into different regions (first display region and second display region) and applies different driving currents to each segment. This segmentation allows independent optimization of each region's luminance without requiring complex multi-level current control throughout the entire display, managing complexity through spatial division.
Data Source
AI summary
A light emitting diode driving device and driving method thereof are provided. The light emitting diode driving device includes a duty cycle setup unit, a current setup unit, a control unit, and a light emitting diode driving circuit. The duty cycle setup unit is used for outputting duty cycle setup signal. The current set up unit is used for outputting a current setup signal. The control unit is used for receiving the duty cycle setup signal and the current setup signal, and outputting a current control signal and a duty cycle control signal in response to the duty cycle setup signal and the current setup signal. The light emitting diode driving circuit is used for driving at least one light emitting diode in response to the current control signal and the duty cycle control signal.