Passive LED Driver Segmentation for Scalable Line Scan Control
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Solution Overview
Problem
Conventional LED driving devices face challenges in scalability and workload management due to the need for increased switching signals and output pins as the number of LEDs increases, requiring redesign of the control unit and increased workload for generating multiple signals.
Innovation Solution
The proposed driving device includes a control unit, a switch unit, and a driver unit, where the driver unit generates switching outputs based on a clock signal and synchronization signal to control switches, allowing for efficient light emission in a line scan manner without the need for redesigning the control unit, even with an increased number of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the total number of LEDs in the LED array is increased, then the LED array can provide higher luminous output, but the total number of switching signals and switching output pins required increases, necessitating redesign of the control unit
Solution Approach 1:
The patent divides the LED array into multiple groups, with each group controlled by a dedicated switch. The switch unit is segmented into multiple switching elements, each receiving control signals independently. This segmentation allows the system to scale to higher power outputs by adding more LED groups and corresponding switches rather than increasing the complexity of a single control path.
Solution Approach 2:
The patent introduces a time dimension through sequential switching control, where switches are activated in different time slots to drive different LED groups. This temporal dimension allows multiple LED groups to be controlled using a manageable number of output pins through time-multiplexed control, rather than requiring one pin per LED.
2Manufacturing precision
If the control unit generates multiple switching signals and gray scale outputs for increased LED arrays, then the LED array can be controlled with higher resolution, but the workload on the control unit increases
Solution Approach 1:
The control signals are segmented into distinct types: gray scale control signals for intensity modulation and switching control signals for timing and selection. This segmentation of control functions allows the control unit to handle different signal types through dedicated output pins, reducing the overall workload by organizing control tasks into manageable segments rather than generating all signals through a single complex control path.
3Adaptability or versatility
If the control unit is redesigned to accommodate increased number of switching output pins, then the device can support larger LED arrays, but the ease of manufacture and deployment decreases
Solution Approach 1:
The control unit is designed with a universal architecture that can support multiple LED array configurations. The switch unit and driver unit are configured to work together in a standardized manner, allowing the same control unit design to accommodate different numbers of LEDs by simply reconfiguring the switching patterns and gray scale assignments rather than requiring hardware redesign.
Solution Approach 2:
The system employs dynamic switching control where the assignment of switches to LED groups and the timing of switching signals can be adjusted without changing the hardware architecture. This dynamic reconfigurability allows the control unit to adapt to different LED array sizes and configurations through software or control logic changes rather than physical redesign.
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
This solution enables efficient light emission in a line scan manner with scalable LED arrays, reducing the workload on the control unit and preventing the need for redesigning the control unit as the number of LEDs increases, while maintaining luminous intensity related to gray scale data.
Implementation Method 1
a light emitting diode (LED) array, and includes a control unit, a switch unit and a driver unit... generates a plurality of drive outputs for receipt by the LED array... so as to drive the LED array to emit light
Data Source
AI summary
A driving device includes a control unit, a switch unit and a driver unit. The control unit is configured to generate a gray scale output and a synchronization signal. The switch unit is coupled to an LED array, and switches among different conduction states based on a switching output. The driver unit is coupled to the control unit, the switch unit and the LED array. The driver unit generates the switching output based on a clock signal and the synchronization signal, and generates drive outputs for receipt by the LED array based on the clock signal, the gray scale output and the synchronization signal, so as to drive the LED array to emit light.