Light-emitting Element Driving Circuit Reducing Switching Operations
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Solution Overview
Problem
In light-emitting element driving circuit systems, the prolonged light emission period with ON-OFF control of switching elements leads to an increased number of switching operations, resulting in higher current consumption, especially when multiple light-emitting elements are arranged in a matrix and emit light in a circulating manner.
Innovation Solution
The system connects multiple current paths with light-emitting elements and switching elements in series in parallel, allowing the ON time of each switching element to be adjusted based on the light-emission period, thereby reducing the number of switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the light emission period is prolonged with ON-OFF control of switching elements, then the light emission duration is extended, but the number of switching operations increases and current consumption rises
Solution Approach 1:
The patent implements periodic action by dividing the light emission into sequential cycles where different light-emitting elements are activated in turns. The control unit orchestrates periodic switching patterns that extend overall light emission duration while limiting the duty cycle of individual switching elements, thereby reducing their switching frequency and associated current consumption.
Solution Approach 2:
The patent applies segmentation by dividing the matrix of light-emitting elements into multiple groups that are controlled independently. The control unit activates different groups in sequential periods, so that not all switching elements operate simultaneously. This segmentation reduces the total number of switching operations required to achieve extended light emission, thereby lowering current consumption.
2Illumination intensity
If multiple light-emitting elements are arranged in matrix form and emit light in circulating manner, then the light emission coverage is improved, but the number of switching operations increases
Solution Approach 1:
The patent merges the control of multiple light-emitting elements into a unified circulating emission pattern. The control unit coordinates switching elements across different rows and columns to achieve comprehensive light coverage through sequential activation. By merging control functions and utilizing the circulating emission pattern, the system achieves broad illumination while managing the complexity of switching operations through systematic coordination rather than independent control of each element.
3Duration of action of moving object
If the ON time of switching elements is extended to maintain light emission, then the light emission period is prolonged, but the current consumption increases
Solution Approach 1:
The control unit implements periodic action by activating switching elements in alternating cycles rather than maintaining continuous ON states. Different switching elements are turned ON and OFF in a periodic sequence, which extends the overall light emission period while ensuring that individual switching elements remain OFF for significant portions of the cycle, thereby reducing their current consumption.
Solution Approach 2:
The patent applies local quality by varying the ON time allocation for different switching elements based on their positions in the matrix. The control unit assigns different duty cycles to switching elements in different rows and columns, optimizing the light emission period while minimizing current consumption for each local region. This non-uniform time distribution ensures extended overall emission without uniformly increasing current draw across all elements.
Data Source
AI summary
A light-emitting element driving circuit system is provided in which a plurality of current paths, in each of which a light-emitting element and a switching element which is controlled to be switched ON and OFF for causing light to be emitted from the light-emitting element are connected in series, are placed in parallel to each other, wherein an ON time of each switching element is adjusted based on a light-emission period which is a period in which the light-emitting elements are caused to emit light in a circulating manner, such that a number of switching operations of each switching element is reduced.