LED Driving System Signal Sequencing for Efficiency
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Solution Overview
Problem
Conventional LED driving systems experience inefficiencies due to non-identical preparation and driving periods, leading to inactive LED devices and idle driving system states, which reduce overall brightness and extend refresh cycles.
Innovation Solution
A method where the driving system receives and processes a sequence of driving signals, determining repetitions and average driving periods to construct a sequence list for efficient transmission, ensuring the LED device remains active by uniformly distributing driving signals across a sequence list, thereby minimizing idle times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving signals are transmitted sequentially with fixed preparation periods, then the driving system can maintain a simple transmission protocol, but the LED device experiences idle periods reducing overall efficiency
Solution Approach 1:
The patent applies dynamics by making the driving period variable based on brightness bit level. Higher brightness bits receive longer driving periods while lower bits receive shorter periods, allowing the system to adapt transmission parameters dynamically rather than using fixed periods for all signals. This resolves the contradiction by optimizing productivity without significantly increasing protocol complexity.
Solution Approach 2:
The patent changes the driving period parameter according to the brightness bit level. Instead of using a uniform driving period, the system assigns different driving periods (T2, 2*T2, 4*T2, etc.) based on the significance of each brightness bit. This parameter change allows the LED device to remain active more consistently, improving efficiency while maintaining a manageable transmission protocol.
2Illumination intensity
If higher brightness bits use longer driving periods, then the LED device can achieve higher brightness levels, but the refresh cycle extends and the driving system spends more time in idle state
Solution Approach 1:
The patent segments the brightness control into multiple bits, where each bit represents a different brightness level. By dividing the brightness control into discrete segments (bits), the system can selectively activate only the necessary number of segments based on the required brightness, rather than using a single long driving period for all cases. This reduces the average refresh cycle time while maintaining the ability to achieve high brightness when needed.
Solution Approach 2:
The patent uses periodic action by implementing a structured sequence of driving signals with varying periods. The driving signals are transmitted in a systematic pattern where higher brightness bits have longer periods and lower bits have shorter periods, creating a periodic transmission scheme that optimizes both brightness achievement and refresh cycle efficiency.
3Illumination intensity
If the LED device is activated for longer periods to achieve higher brightness, then the illumination intensity increases, but the overall system efficiency decreases due to extended inactive periods
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-arranging the driving signal sequence before transmission. The driving system prepares the optimal sequence of driving signals with appropriate periods in advance, ensuring that the LED device receives signals in an order that maximizes efficiency. This preliminary planning allows the system to achieve high brightness when needed while minimizing idle time through optimized signal sequencing.
Data Source
AI summary
In a method for driving a light-emitting diode (LED) device, a driving system is configured to: a) receive a number of driving signals, each corresponding to a period the LED device is to be activated; b) determine a number of repetitions for output of each of the driving signals; c) determine an average driving period for each of the driving signals; d) constructing a sequence list of driving signals to be sent to the LED device, the sequence list including a plurality of rows, each of the rows is numbered and includes two columns for containing respectively two entries of the driving signals therein; and e) sequentially transmit the two entries of the driving signals contained in each of the rows included in the sequence list to the LED device.