Автор: Техническая команда Meitec
Рецензент: Специалист по светодиодным дисплеям
Категория: Основы продукта
Дата последнего обновления: Сентябрь 2026 года
Приёмная карта для светодиодного дисплея — это ключевой компонент системы управления светодиодным экраном. Устанавливаемая внутри светодиодного шкафа или модульной сборки, она принимает цифровые данные отображения от передающего устройства, обрабатывает эти данные и распределяет необходимые управляющие сигналы на светодиодные модули.
Проще говоря, приёмная карта выступает связующим звеном между контроллером светодиодного дисплея и физическими пикселями на экране.
Без приёмной карты большинство обычных полноцветных светодиодных дисплеев не могут корректно интерпретировать видеоданные, передаваемые системой управления. Понимание принципов работы приёмных карт важно при проектировании, настройке, обслуживании или устранении неисправностей светодиодного дисплея.
Каковы функции приёмной карты светодиодного дисплея?
Полная цепочка передачи сигнала светодиодного дисплея обычно включает несколько этапов:
Источник видео → контроллер светодиодного дисплея или передающая карта → кабель передачи данных → приёмная карта → плата HUB или интерфейс модуля → светодиодные модули
Источником видео может быть компьютер, медиаплеер, система камер, видеопроцессор или другое устройство воспроизведения.
Передающее устройство преобразует изображение в данные, которые может передавать система управления светодиодным дисплеем. Эти данные обычно передаются через Ethernet-кабели или волоконно-оптическое оборудование на приёмные карты, установленные по всему светодиодному дисплею.
Каждая приёмная карта управляет определённой группой светодиодных пикселей.
После получения данных карта обрабатывает такую информацию, как:
- Значения цветов пикселей
- Данные яркости
- Информация о градациях серого
- Временные параметры сканирования
- Временные параметры обновления
- Сопоставление модулей
- Коэффициенты калибровки
Затем она формирует электрические управляющие сигналы, необходимые для драйверных микросхем на светодиодных модулях.
Приёмная карта не генерирует видеоконтент самостоятельно. Её задача — корректно принимать, интерпретировать и распределять данные отображения.
Где устанавливается приёмная карта?
Приёмные карты обычно устанавливаются внутри шкафов светодиодных дисплеев.
Типовой шкаф содержит:
- Светодиодные модули
- Блоки питания
- Приёмную карту
- Плату HUB или интегрированную плату распределения сигнала
- Кабели питания
- Кабели передачи данных
В зависимости от архитектуры шкафа одна приёмная карта может управлять всем шкафом, несколькими модулями или определённым участком более крупного шкафа.
В некоторых современных конструкциях светодиодных дисплеев функции приёмной карты и HUB интегрированы в компактные блоки управления. В других используются отдельные приёмные карты, подключаемые к платам HUB через штыревые разъёмы или шлейфы.
Механическая компоновка может различаться, однако базовая функция передачи сигнала остаётся неизменной.
Например, уличный стационарный светодиодный дисплей Meitec MTO Pro Series спроектирован таким образом, что модули, компоненты питания и элементы управления, связанные с приёмной картой, доступны для обслуживания. Его архитектура с фронтальным и тыловым доступом демонстрирует, почему доступность приёмной карты должна учитываться на этапе проектирования шкафа, а не только после установки.
Как работает приёмная карта?
При отображении видео на светодиодном экране изображение разделяется на цифровую информацию о пикселях.
Контроллер светодиодного дисплея определяет, какие пиксели относятся к каждому участку экрана, и отправляет соответствующую информацию через сеть управления.
Приёмная карта получает назначенную ей часть этой информации.
Затем она обрабатывает данные в соответствии с конфигурацией, сохранённой в системе управления, включая физическое расположение светодиодных модулей и электрические характеристики схемы драйверов.
Например, карта должна знать:
- Разрешение модуля
- Количество подключённых модулей
- Схему распределения групп данных
- Режим сканирования
- Тип драйверной микросхемы
- Последовательность каналов RGB
- Ширину и высоту шкафа в пикселях
If these parameters are incorrect, the receiving card may still receive data, but the image can appear scrambled, repeated, shifted, discolored, or partially missing.
This is why receiving-card configuration files are important during LED display commissioning.
Receiving Card vs. Sending Card
Receiving cards and sending cards perform different functions.
A sending card or LED controller is normally located near the video source. It processes the incoming video signal and sends LED-specific image data toward the display.
A receiving card is installed inside the LED display and receives the data assigned to its section of the screen.
A large LED display may therefore use one controller but dozens or even hundreds of receiving cards.
The relationship can be summarized as:
Sending device = distributes screen data
Receiving card = controls a local section of the LED screen
Some modern controllers integrate video processing and sending functions into one unit, so the term “sending card” is less common in certain system architectures. However, receiving cards remain widely used inside LED cabinets.
What Is Receiving Card Loading Capacity?
Loading capacity is one of the most important specifications when selecting or configuring a receiving card.
It describes the maximum number of pixels the card can control under specified operating conditions.
It is commonly expressed as a maximum width, maximum height, or total pixel capacity.
However, loading capacity should not be judged only by multiplying two maximum numbers.
Actual capacity can depend on several factors, including:
- Refresh rate
- Grayscale depth
- Scan ratio
- Driver IC
- Data clock requirements
- Module configuration
- Receiving-card model
- Control system settings
For this reason, the theoretical maximum loading capacity should not automatically be treated as the recommended operating configuration.
The screen designer should verify the receiving-card capacity against the actual LED module specification and control-system requirements.
Example
Suppose one cabinet has a resolution of:
192 × 192 pixels
The total number of pixels is:
192 × 192 = 36,864 pixels
If the receiving card supports this resolution under the required refresh rate, grayscale, and scan configuration, one card may control the entire cabinet.
If the cabinet resolution exceeds the practical loading capacity, multiple receiving cards may be required.
Why Scan Mode Matters
Receiving cards work closely with the LED module’s scan architecture.
Common LED display scan modes include:
- Статическое сканирование
- Сканирование 1/2
- Сканирование 1/4
- Сканирование 1/8
- Сканирование 1/16
- Сканирование 1/32
- Higher scan ratios on some fine-pitch displays
The receiving card must output the correct control sequence for the module’s driver circuit.
A configuration designed for a 1/8-scan module cannot simply be applied to a different module without verifying its electrical architecture.
Incorrect scan configuration may cause duplicated rows, missing lines, abnormal brightness, flashing, or an unreadable image.
This relationship is also why specifications such as scan mode, refresh rate, and grayscale should be evaluated as parts of one driving system rather than as completely independent values.
For additional technical articles covering these display parameters, see the Meitec LED Display Knowledge Base.
What Is a HUB Board?
A HUB board is often used between the receiving card and LED modules.
Its purpose is primarily signal distribution.
The receiving card processes the display data, while the HUB board routes the output signals to the appropriate module connectors.
Depending on the LED display architecture, the HUB board may distribute:
- RGB data signals
- Clock signals
- Latch signals
- Output-enable signals
- Row-selection signals
Using a standardized HUB board can simplify cabinet wiring and make component replacement easier.
Some newer cabinet designs integrate more control and monitoring functions into the HUB architecture, reducing cable complexity.
The receiving card and HUB board should therefore not be treated as the same component, even though they are closely connected.
What Are the Main Specifications of a Receiving Card?
When evaluating an LED display receiving card, several specifications are particularly important.
1. Loading Capacity
This determines how many pixels the card can control.
Higher cabinet resolutions, especially in fine-pitch LED displays, generally require more careful capacity planning.
2. Supported Scan Modes
The card must support the scanning architecture used by the LED module.
3. Data Outputs
Receiving cards provide multiple output groups that transmit data to the LED modules.
The required number depends on module design and cabinet resolution.
4. Refresh and Grayscale Support
The receiving card participates in the control architecture that determines how image data is driven.
However, a receiving card alone does not guarantee a specific refresh rate or grayscale level. Driver ICs, module design, scan ratio, controller configuration, and other system parameters also affect final performance.
5. Calibration Support
Professional LED systems may store brightness and chromaticity calibration coefficients.
Receiving cards that support calibration data can help maintain more consistent brightness and color across modules or cabinets.
6. Monitoring Functions
Depending on the control system and hardware design, receiving cards may support monitoring of parameters such as:
- Cabinet temperature
- Power status
- Voltage
- Communication status
- Hardware faults
These functions are particularly useful for large fixed installations where technicians need centralized system diagnostics.
What Is Receiving Card Redundancy?
Receiving-card redundancy is used in applications where signal reliability is especially important.
Instead of relying on a single data path, a redundant system can provide a backup signal path or receiving-card architecture.
If the primary communication path experiences a failure, the backup path can help maintain display operation depending on the specific system design.
This is particularly relevant for:
- Control rooms
- Broadcast environments
- Command centers
- Transportation systems
- High-value live events
- Mission-critical visualization systems
For example, Meitec’s control-room project using the NOC Pro Series incorporates dual receiving card redundancy together with dual power backup because the LED wall is designed for continuous operation.
Redundancy is not required for every LED display. It should be selected according to the consequences of system interruption and the reliability requirements of the application.
How Are Receiving Cards Connected?
Receiving cards are commonly connected in a daisy-chain network.
A typical signal path may look like:
Controller → Cabinet 1 → Cabinet 2 → Cabinet 3 → Cabinet 4
Each cabinet receives the data relevant to its assigned screen area while passing communication data to the next cabinet.
Ethernet cables are commonly used between cabinets.
For long-distance transmission, fiber-optic converters or fiber-based control systems may be used between the control room and the LED display before the signal is distributed locally.
Correct cabinet mapping is essential. If the physical connection order does not match the software configuration, parts of the image may appear in the wrong position.
What Happens If a Receiving Card Fails?
Receiving-card problems usually affect a larger display area than individual LED or driver IC failures.
Common symptoms include:
- One complete cabinet showing no image
- Several modules within one controlled area going black
- Abnormal or scrambled content
- Incorrect colors
- Repeated image sections
- Intermittent flashing
- Loss of communication with a cabinet
- Cabinets after one point in the signal chain losing data
However, these symptoms do not automatically prove that the receiving card itself is defective.
Similar problems can be caused by:
- Loose Ethernet cables
- Damaged network cables
- Faulty HUB boards
- Incorrect configuration files
- Power supply problems
- Poor connectors
- Incorrect module parameters
- Data-chain interruptions
Troubleshooting should therefore follow the signal path systematically.
Basic Receiving Card Troubleshooting
When a cabinet loses its image, technicians can begin with several checks.
First, verify that the receiving card has power.
Next, inspect communication indicators and data cables. If multiple downstream cabinets are also offline, check the signal cable entering the first affected cabinet.
If communication appears normal but the display content is incorrect, verify the receiving-card configuration and module parameters.
A known-good Ethernet cable or receiving card can also be used for comparison where appropriate.
Before replacing hardware, save the original configuration and confirm that the replacement card is compatible with the existing control system.
Avoid randomly loading configuration files from another LED screen. Two displays may use similar-looking modules while having different scan methods, driver ICs, or signal mappings.
How to Choose the Right Receiving Card
The receiving card should normally be selected as part of the complete LED display control architecture rather than purchased only according to price or maximum pixel capacity.
Important factors include:
- LED module resolution
- Cabinet resolution
- Scan method
- Driver IC
- Required refresh rate
- Required grayscale performance
- Calibration requirements
- Monitoring requirements
- Redundancy requirements
- Control-system compatibility
- Maintenance method
For an existing LED display, it is usually safest to use the receiving-card model and configuration specified by the display manufacturer unless a compatible replacement has been technically verified.
For a new project, the LED display manufacturer or system integrator should calculate receiving-card loading together with module and cabinet design.
Does the Receiving Card Affect LED Display Image Quality?
Yes, but not independently.
The receiving card is part of the display driving chain, so its processing capability and configuration influence how correctly image data reaches the LED modules.
However, image quality is determined by the complete system.
Important factors include:
- LED quality
- Driver IC
- PCB design
- Режим сканирования
- Приёмную карту
- Controller
- Refresh rate
- Grayscale processing
- калибровку
- Video source quality
Therefore, replacing a receiving card with a higher-specification model does not automatically improve the screen if the LED modules or driver architecture cannot support the desired performance.
A professional LED display should be engineered as one coordinated system.
Final Summary
An LED display receiving card receives image data from the LED controller and converts it into the control signals required by the LED modules.
It determines which part of the image is displayed by a specific cabinet or screen section and works together with the HUB board, driver ICs, modules, and sending system.
When evaluating a receiving card, the most important considerations are not simply brand or maximum pixel capacity. Compatibility with cabinet resolution, scan mode, driver IC, refresh requirements, calibration, monitoring, and redundancy must all be considered.
For maintenance teams, understanding the receiving card also makes troubleshooting easier because a cabinet-level display fault can often be traced systematically through power, communication, receiving-card, HUB-board, and module stages.
In a correctly engineered LED display, the receiving card may be physically small, but it is one of the most important components connecting digital video data to the actual LED pixels.
Frequently Asked Questions
Is a receiving card required for every LED display cabinet?
Not necessarily. One receiving card may control one cabinet, multiple small cabinets, or part of a high-resolution cabinet depending on loading capacity and system architecture.
Can different receiving card brands be mixed in one LED display?
This is generally not recommended unless compatibility has been verified by the control-system provider or LED display manufacturer. Communication protocols, software, configuration files, and supported functions can differ.
Does a receiving card store the video content?
Normally, no. Its primary function is to receive and process display data. Content storage is generally handled by a media player, computer, controller, or asynchronous playback device.
Can a receiving card increase refresh rate?
The receiving card contributes to the driving system, but refresh rate also depends on the driver IC, module circuit, scan ratio, grayscale settings, and system configuration. Changing only the receiving card does not guarantee a higher refresh rate.
How many receiving cards does an LED screen need?
The number depends mainly on total screen resolution, cabinet resolution, receiving-card loading capacity, and system architecture. The calculation should be made during control-system design rather than based only on the physical size of the screen.
