2026-07-21Welcome to the final installment of Redot’s comprehensive LED wall displays terminology series!
Over the past three articles, we have explored everything from the most basic concepts – what an LED is, pixel pitch, Gamma correction, constant-current drive, and viewing angles. If you have been with us from the beginning, you have now built a solid foundation of knowledge that rivals many industry professionals.
Today, in Part 4, we are covering the final 19 essential terms. This batch includes concepts related to signal processing, control systems, communication protocols, and hardware interfaces. These terms may not come up in everyday conversation, but they are critical when you dive into system integration, installation, and technical troubleshooting.
Let us complete your journey to becoming truly fluent in the language of LED wall displays!
Color distortion refers to a phenomenon where the color displayed on an LED wall display does not match the color of the same object as seen by the human eye in real life. In other words, the screen fails to reproduce the true color of the subject.
Common causes:
Inadequate grayscale levels
For professional applications like broadcast, retail, and high-end events, minimizing color distortion is non-negotiable. Always choose LED wall displays from manufacturers that perform rigorous factory calibration.
These two terms describe how an LED wall display receives and processes video content – specifically, whether it relies on a connected computer for real-time playback:
A synchronous system means the content displayed on the LED wall display is perfectly synchronized with the content displayed on the computer monitor. Whatever you see on the computer screen appears simultaneously on the LED screen in real time.
Use cases: Live broadcasts, concerts, events, and any application requiring real-time content changes.
An asynchronous system means the display content is pre-edited and stored in the display’s internal control system (memory). Once the data is uploaded, the computer can be turned off – the LED screen will continue to play the stored content independently.
Use cases: Billboards, retail signage, information displays, and applications where content changes are scheduled in advance.
Blind spot detection is a technology that uses software (host computer) and hardware (control system) to automatically detect faulty pixels on an LED wall display, including open-circuit or short-circuit LEDs (blind/dead pixels).
The system identifies these defective pixels and generates a report that informs the screen manager exactly which pixels need replacement or repair.
The system continuously checks the working condition of all power supplies and generates a diagnostic report – alerting maintenance personnel to any failing or failed power units.
These two terms are closely related but refer to different parts of the brightness management process:
Brightness detection refers to measuring the ambient light level of the environment where the LED wall display is installed. This is typically done using a light sensor that reads the surrounding light conditions.
Brightness adjustment refers to modifying the light output (luminance) of the LED display itself. Once the ambient brightness is detected, the data is fed back to the control system, which automatically adjusts the screen’s brightness to match the environment.
Example: In direct sunlight, the screen brightens to remain visible. At night, the screen dims to save energy and prevent eye strain. This automatic process is called auto-brightness adjustment – a key feature for outdoor LED wall displays.
These terms define the relationship between physical LED pixels and the image resolution they can display:
Real pixels mean the relationship between physical pixel count and displayed pixel count is 1:1. The screen has exactly as many physical pixels as the image resolution it can display. Each physical pixel represents one image pixel.
Virtual pixel technology uses a technique where the relationship between physical pixels and displayed pixels is 1:N (typically N = 2 or 4). Through clever control algorithms, the screen can display 2× or 4× more image pixels than its physical pixel count.
Disadvantage: Reduced image sharpness and potential artifacts compared to true physical pixel resolution.
For high-end applications where image quality is paramount, real pixel LED wall displays remain the preferred choice.
These are two methods of transmitting video signals from the control source to the LED wall display:
Fiber optic transmission involves converting electrical signals into light signals and transmitting them through transparent glass or plastic fibers (optical fibers).
Advantages: Extremely high bandwidth, immune to electromagnetic interference, capable of transmitting over very long distances (kilometers) with minimal signal loss.
Network cable transmission uses metal conductors (typically copper wires in Ethernet cables) to directly transmit electrical signals.
Advantages: Lower cost, simple connectivity, sufficient for shorter distances.
The choice between network cable and fiber optic transmission depends primarily on transmission distance:
> 500 meters Single-mode fiber – designed for long-distance transmission (up to several kilometers)
For outdoor or large-venue installations, always plan your signal transmission path in advance and choose the appropriate medium to avoid signal degradation.
These terms describe how a computer controls an LED wall display over a network:
LAN control means using one computer on a local network to control another computer or an external device connected to it (such as an LED display controller). Both devices are on the same local network.
Internet control means the main controller accesses the target device through its IP address on the public Internet. This allows for remote control of LED wall displays from anywhere in the world.
Use case: A digital signage network operator in New York can send content updates to LED screens in Los Angeles and London using Internet control.
These are two common video signal interfaces used to connect video sources to LED wall displays:
DVI stands for Digital Video Interface. It is an internationally standardized digital video signal interface that transmits pure digital signals from the source to the display.
Advantages: No digital-to-analog conversion, resulting in higher image quality, sharper details, and less signal degradation.
VGA stands for Video Graphics Array. It is an older video signal interface that transmits analog video signals (R, G, B analog outputs).
Advantages: Widely available, compatible with older equipment.
Disadvantages: Analog signals are more susceptible to interference and quality loss over longer cable runs.
While VGA is still found on some legacy equipment, modern LED wall displays overwhelmingly use DVI, HDMI, or Display Port for their superior digital signal quality.
A digital signal is a signal whose amplitude values are discrete – meaning the value is limited to a finite set of levels, typically represented as 0 and 1 (binary). Digital signals are used to transmit data as a series of on/off pulses.
A digital circuit is an electronic circuit that processes and controls digital signals – manipulating binary data to perform logic, arithmetic, and control functions.
Examples in LED displays: Video processors, receiving cards, and control systems all use digital circuits to process image data.
An analog signal is a signal whose amplitude varies continuously over time – taking on any value within a continuous range, rather than discrete 0/1 states.
An analog circuit is an electronic circuit that processes and controls analog signals – handling continuous voltage or current variations.
Examples in LED displays: Some legacy video inputs, power regulation circuits, and sensor interfaces may use analog circuits. However, most modern LED wall displays are predominantly digital.
PCI stands for Peripheral Component Interconnect. A PCI slot is an expansion slot on a computer motherboard that allows you to install various expansion cards – such as graphics cards, network cards, sound cards, and video capture cards.
Relevance to LED displays: In older LED control systems, a PCI card might have been used to output video signals directly from the computer to the display. Today, most systems use external video processors and sending cards connected via USB, Ethernet, or HDMI.
AGP stands for Accelerated Graphics Port. It is an interface specification designed specifically for high-speed 3D graphics on personal computers.
Key features:
Supports advanced 3D graphics technologies like texture mapping, zero buffering, and alpha blending
These are wireless communication technologies that have been used in remote control applications for LED wall displays:
GSM – Global System for Mobile Communications, is a digital mobile communication standard introduced by the European Telecommunications Standards Institute in 1992. It uses digital technology and unified network standards to ensure call quality and support value-added services.
CDMA – Code Division Multiple Access, is a spread-spectrum wireless communication technology – a mature and reliable alternative to GSM-based networks.
Relevance to LED displays: These technologies have been used to enable remote wireless control of LED screens. Today, 4G and 5G modules have largely replaced GPRS/GSM for high-bandwidth applications.
On a GPRS mobile data network, an LED wall display can be equipped with a GPRS transceiver module to enable wireless data communication.
Applications:
Remote control – manage screens from a central location without needing physical network cables
While GPRS offers relatively low bandwidth, it is sufficient for simple text and basic graphic updates. For high-resolution video content, higher-bandwidth connections (fiber, Ethernet, or 5G) are required.
These are serial communication standards commonly used in industrial and display control applications:
Limitations: Short transmission distance (typically < 15 meters), supports only one device per connection.
RS-485 is an enhanced serial communication standard that improves upon RS-232.
Use case: RS-485 is often used to connect multiple LED display modules or control systems in large installations where devices are spread across long distances.
ARM stands for Advanced RISC Machines. It refers to:
A technology for efficient, low-power processing
So, an ARM system is a signal control and processing system built around an ARM-based CPU.
ARM-based control systems are widely used in LED wall displays for:
Low power consumption and high performance – ideal for embedded display controllers
USB stands for Universal Serial Bus. It is a widely adopted interface standard for connecting peripheral devices to computers.
Key features:
Two main versions: USB 1.0 and USB 2.0 (with USB 3.0 and higher now common for faster data transfer)
That’s the wrap of LED display terminology series.
We hope this series has been a valuable resource – whether you are just starting out in the industry or looking to deepen your technical understanding. Mastery of these terms will help you communicate confidently with suppliers, make better purchasing decisions, and ultimately deliver more successful projects.
This concludes Redot's LED wall displays terminology series. We have covered the essential terminology, but the LED industry is always evolving – new technologies, new concepts, and new standards continue to emerge.
