LED Driving Circuit Row Control via Switch Module

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Solution Overview

Problem

Conventional LED driving circuits for large-size display devices are complex and costly due to the large number of MOSFETs required, which complicates the circuit layout and increases production expenses.

Innovation Solution

An LED driving circuit that includes a control module, a first driving module for column control, and a switch module with flip-flop or microcontroller units for row control, simplifying the circuit layout and reducing complexity by using a switch module to drive rows of LED units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If MOSFETs are used to control each row of LED units, then the LED display device can be driven, but the circuit layout becomes vast and complicated

Engineering Contradiction:

ImproveLED row control capabilityVSAvoidcircuit layout complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a switch module as an intermediary component between the control module and the LED rows. This switch module includes multiple switch units that can be controlled by a reduced number of control signals, thereby simplifying the circuit layout while maintaining the capability to control each LED row independently

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The switch module is designed to perform multiple functions: it can control multiple LED rows using fewer control signals, and the same control structure can be applied to different display sizes and configurations, reducing the overall complexity of the driving circuit

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Area of stationary object

If a large number of MOSFETs are used for large-size display devices, then the display area can be increased, but the cost increases

Engineering Contradiction:

Improvedisplay device sizeVSAvoidmanufacturing cost

Core Design Contradiction:

Area of stationary objectVSEase of manufacture

Solution Approach 1:

The switch module serves as a universal control structure that can be scaled for different display sizes. By using this modular approach, the patent reduces the number of control components needed, thereby lowering manufacturing costs while maintaining the ability to create large-size display devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If each MOSFET is lined with at least one control line, then the LED rows can be controlled, but the circuit layout becomes complicated

Engineering Contradiction:

ImproveLED row controlVSAvoidcircuit layout

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The switch module acts as an intermediary that receives control signals and distributes them to control multiple LED rows. This intermediary structure reduces the number of direct control lines needed from the control module, thereby simplifying the overall circuit layout while maintaining full control capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10515582B2Light emitting diode driving circuit and light emitting diode display device

Publication Date: 2019.12.24 SILICON TOUCH TECH INC

AI summary

An LED driving circuit is provided in the present disclosure for driving an LED matrix module. The LED matrix module includes a plurality of LED units. The LED driving circuit includes a control module, a first driving module and a switch module. The first driving module is used for driving at least one column of the LED matrix module according to a first driving signal provided by the control module. The switch module is electrically connected to the control module for receiving a second driving signal from the control module to drive the at least one row of the LED units of the LED matrix module.