Basic Knowledge of LED Display Screen

What is LED display?

The LED display screen is a flat-panel display, which is composed of light points with a certain spacing and a certain specification. Each light point is composed of a single LED light-emitting tube. It uses light-emitting diodes as display elements and controls the display mode of semiconductor light-emitting diodes to display text, graphics, images, animations, market prices, videos, video signals and other information. LED display screens are usually divided into stroke displays and character displays, such as digital tubes, symbol tubes, pyramid tubes, matrix tubes, level display tubes, etc.

How LED display works

The working principle of LED display screen is to use the characteristics of light-emitting diodes to form an array of LED devices through a certain control method to form a display screen. Each LED represents a pixel, and the LEDs in an LED display are organized into different columns and rows, forming a grid-like structure. When you want to display specific content, by controlling the brightness and color of each LED, you can create the desired image or text. Controlling the brightness and color of LEDs can be done via digital signals. The control system of the display screen will send the input digital signal to the corresponding LED to control its brightness and color. In order to achieve high brightness and clear display effects, LED displays usually use PWM (Pulse Width Modulation) technology, which controls changes in display brightness by continuously switching the LED on and off. LED displays can also use full-color LED technology, which combines three different colors of red, green, and blue LEDs to display colorful images through different brightness and color combinations.

The composition of LED display screen

LED display screen mainly consists of the following parts:

LED unit board: This is one of the core components of LED display, consisting of LED module, driver chip and PCB circuit board.

Control card: used to control the LED unit board, which can control a 256×16 dot two-color screen with 1/16 scan, and can assemble a cost-effective LED screen.

Wiring: including data lines, transmission lines and power lines. The data line is used to connect the control card and the LED unit board, the transmission line is used to connect the control card and the computer, and the power line is used to connect the power supply, the control card and the LED unit board.

Power supply: Generally, switching power supply is used, with 220V input and 5V DC output.

In addition, depending on the use environment, LED displays may also include other accessories and equipment, such as front panels, cabinets, protective covers, etc.

Characteristics of LED display

The main features of LED display screens are as follows:

High brightness: The LED display screen has high brightness and can be used outdoors all day long as well as indoors.

Long life: LED display screens have a long service life, generally reaching more than 100,000 hours.

Large viewing angle: The LED display screen has a large viewing angle and a wide viewing range, so viewers can view the screen from different angles.

Flexible size: The size of the LED display can be designed as needed, ranging from less than one square meter to hundreds or thousands of square meters.

Easy to interface with computers: LED display screens can be easily interfaced with computers, support a variety of software, and can display text, images, videos and other information.

Energy saving and environmental protection: The LED display uses low voltage power supply, low power consumption, and is environmentally friendly and pollution-free.

High reliability: LED display screen has high reliability and can work in harsh environmental conditions, such as high temperature, low temperature, humidity and other environments.

Real-time: LED display can display various information in real time, such as news, advertisements, notifications, etc.

Efficiency: The LED display screen updates quickly and can update and display information in a short time.

Versatility: LED display screen can realize a variety of functions, such as video playback, interactive communication, remote monitoring, etc.

LED electronic display system composition

 

The LED electronic display system mainly consists of the following parts:

LED display: LED display is the core part of the LED electronic display system, which consists of LED lamp beads, circuit boards, power supplies and control chips. LED lamp beads usually use types such as SMD LED (Surface Mounted Device LED) or DIP LED (Dual In-line Package LED), which are used to emit light to produce images.

LED display control system: The LED display control system is used to receive and store display data, process and distribute the data, and then send the data to the LED display through a specific control method.

LED display information processing system: The LED display information processing system is mainly responsible for processing original data, such as decoding, format conversion, image processing, etc., to ensure that the data can be displayed correctly on the LED display.

LED display power distribution system: LED display power distribution system is mainly responsible for providing power to the LED display, usually including power sockets, power cords, power adapters, etc.

LED display safety protection system: The LED display safety protection system mainly includes waterproof, dustproof, lightning protection and other devices to protect the LED display from environmental factors.

LED display structural frame project: LED display structural frame project mainly includes steel structure, aluminum profiles, grid structure, etc., which are used to support and fix various components of the LED display.

In addition, depending on actual needs, the LED electronic display system may also include other accessories and equipment, such as front panels, cabinets, protective covers, etc. These accessories and equipment can enhance the functionality and safety of the LED electronic display system and improve its use.

 

Classification of LED display screens

Outdoor LED display: LED displays suitable for use in outdoor environments generally require waterproofing, dustproof and other measures.

LED rental display screen: a display screen that can be disassembled and installed repeatedly. The screen body is ultra-light, ultra-thin, and space-saving. It can be spliced in any direction, size, and shape to present various visual effects.

LED small-pitch screen: an ultra-fine-pitch, high-pixel-density display screen.

LED transparent screen: also called grid screen, the LED display screen is made transparent.

LED creative display: a special-shaped display with innovation and creativity as its core. The more common ones include LED cylindrical screens and sphere LED displays.

LED fixed display screen: a traditional conventional LED display screen with consistent screen size, one-piece molding without deformation, and small error.

Pixel pitch of LED display

The main pixel pitches of LED displays are as follows:

Less than or equal to P1: The pixel pitch is 1 mm. It is suitable for indoor high-definition display. The pixel density is extremely high and the picture is delicate. It is generally used for close viewing situations, such as conference rooms, TV stations, command centers, etc.

P1.25: The pixel pitch is 1.25 mm, suitable for close viewing, requiring high resolution and delicate picture effects, often used in indoor applications.

P1.5: The pixel pitch is 1.5 mm, suitable for close viewing, requiring high resolution and good display effect, often used in indoor applications.

P1.8: The pixel pitch is 1.8 mm, suitable for near and medium distance viewing, requiring higher resolution and clarity, and commonly used in indoor applications and outdoor semi-shading situations.

P2: The pixel pitch is 2 mm, suitable for indoor places, such as shopping malls, hotels, etc., and can achieve high-definition effects.

P3: The pixel pitch is 3 mm. It is widely used in indoor venues, shopping malls, etc., with good display effect and relatively low price.

P4: The pixel pitch is 4 mm, suitable for indoor and semi-outdoor environments, such as commercial advertisements, stations, etc., with good visual effects and image fineness.

P5: The pixel pitch is 5mm, suitable for indoor and semi-outdoor environments, such as shopping malls, sports venues, etc., with high brightness and wide viewing angle.

Greater than or equal to P6: The pixel pitch is 6 mm, suitable for indoor and outdoor complex environments, with good protective performance and durability.

Application scenarios of LED display screens

The application scenarios of LED display screens are very wide, mainly including the following aspects:

Commercial advertising: LED display screen can be used to play advertisements, promotional information, etc. It has the characteristics of high brightness, high definition, and bright colors, which can attract the attention of a large number of viewers and improve the publicity effect.

Cultural entertainment: LED displays can be used in stage backgrounds, concerts, concerts and other cultural and entertainment activities to create a unique atmosphere and visual effects and enhance the audience’s viewing experience.

Sports events: LED displays can be used in stadiums to display game information, timing and scoring, highlight replays and other functions in real time, providing audiences with a more convenient and accurate viewing experience.

Transportation: LED displays can be used in transportation places such as stations, airports, and docks to provide real-time traffic information, signs, advertising and other functions to facilitate passengers’ travel and understanding of relevant information.

News and information: LED display screens can be used to display news, weather forecasts, traffic information and other public information to facilitate citizens’ lives and access to information.

Financial industry: LED displays can be used in financial institutions such as banks and securities companies to display financial market conditions, transaction information, advertising and other functions to provide customers with more timely and accurate services.

Government agencies: LED displays can be used in government agencies to publish government announcements, policies, regulations and other information to improve the transparency and credibility of government work.

Education industry: LED displays can be used in schools, training institutions and other educational places for teaching demonstrations, examination monitoring, information release and other functions to improve the quality and efficiency of education and teaching.

The development trend of LED display screen

The development trends of LED display screens are mainly reflected in the following aspects:

High resolution and full color: With the advancement of technology, the resolution of LED displays is getting higher and higher, and the color performance is getting richer and richer. In the future, LED displays will achieve higher pixel density and wider color gamut coverage, bringing a more delicate and realistic visual experience to the audience.

Intelligence and interactivity: The intelligence and interactivity of LED displays are also future development trends. Through built-in sensors, cameras and communication modules, LED displays can interact with the audience and enhance the audience’s sense of participation and experience.

Energy saving and environmental protection: LED display screen has the advantages of energy saving and environmental protection, and this advantage will be more prominent in the future. By adopting more efficient LED lamp beads and optimizing power supply design, the energy efficiency of LED displays will be further improved, and its environmental performance will also be enhanced.

Thinness, lightness and foldability: In order to adapt to the needs of different occasions, LED displays are developing in the direction of thinness, lightness and foldability. This design allows for easy installation and transportation, while also improving the flexibility and adaptability of the LED display.

Internet of Things integration: With the development of Internet of Things technology, LED displays will be interconnected with other devices to form an intelligent Internet of Things system. This will make the LED display screen have stronger functions and higher efficiency in information release, data collection and automated control.

Virtual reality (VR) and augmented reality (AR) technology applications: The development of VR and AR technology will further promote the application of LED displays. By combining with these technologies, LED displays will be able to present more immersive virtual scenes and augmented reality effects, bringing an unprecedented visual experience to the audience.

Large screen and splicing: In order to meet the growing demand for large screens, LED displays are developing towards larger screens. At the same time, through splicing technology, multiple screens can be spliced and combined to meet applications in different occasions and needs.

The development trend of LED displays is towards higher resolution, full color, intelligence, interactivity, energy saving and environmental protection, thinness and foldability, Internet of Things integration, VR and AR technology applications, and large screens and splicing. direction development. These development trends will make LED displays widely used in more fields and become one of the important choices for future information display.

LED display installation method

The main installation methods of LED display screens are as follows:

Wall-mounted installation: Fix the LED display on the wall or other flat surface, suitable for smaller LED displays.

Embedded installation: Embed the LED display into the building and integrate it with the building. It is suitable for large-scale LED displays.

Suspended installation: Suspend the LED display on the ceiling, suitable for large LED displays or places that require height adjustment.

Column installation: Install the LED display on a column, suitable for roads, parking lots and other places.

Rooftop installation: Install the LED display on the roof of the building, suitable for large LED displays or places that require long-distance viewing.

According to different use places and needs, you can choose the appropriate installation method. When choosing an installation method, you need to consider factors such as the size, weight, and structure of the display, as well as the load-bearing capacity and space size of the installation location.

 

Common faults and analysis

Common faults of LED displays include a variety of manifestations. The following is an analysis of some fault phenomena and their possible causes:

The display does not light up: It may be caused by power supply problems, signal transmission problems or problems with the LED display itself. It is necessary to check whether the power supply is normal, check whether the signal transmission line is smooth, and check whether the LED display screen is working properly.

Insufficient brightness of the display screen: It may be caused by low power supply voltage, aging of LED lamp beads, or drive circuit failure. It is necessary to check whether the power supply voltage is stable, whether the LED lamp beads are aged or damaged, and whether the drive circuit is faulty.

The color of the display is incorrect: It may be caused by the aging of the LED lamp beads or color mismatch. It is necessary to check whether the LED lamp beads are aged or damaged and whether the colors match.

Display flickering: It may be caused by unstable power supply voltage, signal transmission problems or problems with the LED display itself. It is necessary to check whether the power supply voltage is stable, check whether the signal transmission line is smooth, and check whether the LED display screen is working properly.

Bright lines or bands appear on the display: It may be caused by aging of the LED lamp beads or wiring failure. It is necessary to check whether the LED lamp beads are aged or damaged, and whether the wiring is faulty.

Abnormal display on the display: It may be caused by incorrect control card settings, signal transmission problems, or problems with the LED display itself. It is necessary to check whether the control card settings are correct, check whether the signal transmission line is smooth, and check whether the LED display screen is working properly.

In view of the above fault phenomena, corresponding measures can be taken to troubleshoot and repair. At the same time, regular maintenance and upkeep of LED displays can also effectively prevent failures.

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