When you get an LED display, chances are you can get overwhelmed by all the technical aspects of its installation and operation. LED display connection is one of the aspects you need to fully understand if you want to properly operate your LED screen.

Before diving into the technical aspects that come with using an LED display, you need to know the basic things first to make it easier to understand.

To learn about the different types of connectivities that run this device, you should know about the LED display board connection and which connections are relevant for the device to effectively operate.

How to Connect LED Displays

Before discussing all the connections related to LED displays, it is vital to learn about the composition of the LED control system. If you want to learn in-depth about the LED control system, visit this page. Once you get to know the composition of the system, you will also learn about the connections within this entire structure.

The LED display connection diagram includes signal transmission connection and power transmission connection.
The signal transmission path is input from the computer, camera, DVD, and other signal input devices to the video processor, and then transmitted to the LED display through the sending card;
The power transmission path provides 220v or 110v power to the power distribution box, which is converted into DC5V voltage by the power supply to power the LED module.
Below we will explain in detail the detailed connection process of LED display signal transmission and power transmission.

LED display video processor cable connection

Here is an LED display connection diagram with a video processor. 

video processor cable connection
video processor cable connection

In this diagram, you can see that the video processor is divided into input area and output area.
The input area is the input of various video or picture signal sources, mainly including the following:

The output area is mainly connected to the sending card or sending box through the DVI or VGA output port.

The controller will then be connected to the LED screen using ethernet cables. And there are cases where a video processor is also added to the mix. And this is how you can connect the LED video processor to your PC. 

The truth is that understanding LED display connection can be quite tedious and it might be better to just rely on the experts for your connectivity needs. However, it also would be a good idea to learn its basics so as not to be caught off-guard and appear like a deer in headlights. It is especially relevant once you decide to upgrade your LED display products. 

LED display connection of Network cable

The following is a diagram of the network cable connection sequence. The sending card or sending box output port is connected to the first receiving card of the LED display through a network cable. The first receiving card is cascaded with the second receiving card, and then the second receiving card is connected with the third receiving card. Cascading of receiving cards… In this way, the cascade has been connected to complete all receiving cards.

Network cable connection
Network cable connection

Usually, the receiving card is installed inside the cabinet, so the network cable connection between the receiving cards can also be regarded as the network cable connection between the cabinets.

Maybe you are curious, as to why some LED displays use one network cable, while others require multiple network cables. In fact, this is related to the load of a network port. A load of a network port is less than 650000 dots.

For example, an LED display screen width of 1920 dots x height of 1080 dots = 2,073,600 dots, 2,073,600 ÷ 650,000 dots = 3.19, so this LED display screen requires at least 4 network cables to be loaded.

LED display connection of Flat cable

When the signal is transmitted to the receiving card, the receiving card transmits the signal to each LED module through flat cables. Its connection is shown in the figure below.

Generally, there are four types of flat cable connections:

  • Normal outputs, the LED modules in the first column are connected to the receiving card with long cables, and the LED modules in other columns are cascaded with cables;
  • symmetrical outputs, 2 columns of LED modules are connected to the receiving card, and other LED modules are cascaded;
  • Triple strip outputs, A single receiving card connects to 3 columns of LED modules;
  • Quadruple strip outputs, The receiving card is connected to the 4-column LED module with flat cables
flat cable connection
flat cable connection

AC cable connection

We have already introduced the signal transmission and connection of the LED display screen before, but for the LED display screen to work normally, it is not enough to have a signal. You must ensure that its power supply system can work normally. Let’s first introduce the connection of AC cable.

AC cable connection
AC cable connection

AC cord connection sequence The 3×2.5mm2 main AC cable is connected from the power distribution box to the AC terminal block inside the cabinet, and then from the terminal block to the AC input of the power supply.

When you use the AC cable to connect to the power supply, please note that the brown wire is connected to the “L” on the power supply, the blue wire is connected to the “N”, and the yellow-green wire is connected to the “G”

power supply connection
power supply connection

The load of the 3 x 2.5mm2 AC cable is related to the use environment, temperature, etc. Under normal use conditions, the 220V input voltage can carry 3600W (300W power supply is less than 12 pcs, 200 power supply is less than 18 pcs), the 110V input voltage can carry 1800W (Less than 6 300W power supplies, less than 9 pcs 200W power supplies)

DC5v wire connection

After the AC power is connected to the power supply, it is converted into DC5V voltage and output to power the LED module.

The number of LED modules loaded by the power supply is calculated based on the maximum white balance current of the LED module. The power supply load of fixedly installed LED display screens is less than 80%, and the power supply load of rental LED display screens is less than 85%.

LED Display Connection – Wiring

The wiring rules on the power supply are: red is connected to the “+” pole and black is connected to the “—” pole. The module is usually connected to 4 pcs 0.75mm2 2 red and 2 black wires with VH4 connectors for the power-led module.

Kinds of Connections Use in LED Displays

When it comes to LED display connections, there are different types of connections you can use. These different connections are often used to connect LED modules, which can be applicable both for power and data connections. Here are some of these connections:

Serial connection (End-to-end) 

This refers to the connection where LEDs function like a chain, where one LED receives a signal from the controller and then passes it on to the next LED. This pattern continues up to the last LED. 

Advantage: Needs fewer pins on the LED controller (Ideal connection for microcontrollers) & longer cable reach from the controller to the LED screen

Disadvantage: Processes data slowly since it needs to go through all the LEDs in the ensemble 

Parallel connection 

This kind of LED display connection features LEDs arranged in rows and columns, where the ones in one row are connected to a single pin, and the ones in one column are connected to a single pin in the controller. 

Advantage: Capable of supporting many LEDs and relatively easy to install or use

Disadvantage: Needs many pins to operate well (Not suitable for microcontrollers)

Multiplex or Hybrid Assembly Connection

The multiplex LED display connection features LEDs arranged in rows and columns. The controller then sends a signal using a specific pattern or sequence on each column or row. 

Advantage: Enables to control a huge number of LEDs using only a few pins on the controller

Disadvantage: Requires meticulous coordination and exact timing to function so may show ghosting or flickering effects when the refresh rate is low


When dealing with LED display connection, it is important to look at all the different types you will use in operating the display. Being familiar with the structure of your LED display is key to understanding what’s connected to which. 

The entire LED display ensemble is made of three to four components, including the computer, controller, LED screen, and sometimes an LED video processor. All of these components are connected using USB wires or ethernet cables, for data or network and power wiring. This is the general view of an LED display connection you should know and learn about.

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