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1. Introduction of LED display

The LED display is a display device composed of light emitting diodes. It is driven by low-voltage scanning and has:

less power consumption

long lasting

low cost

High Brightness

Few faults

Large viewing angle

long viewing distance

Specification Variety:

At present, LED display, as a new generation of information dissemination media, has become a symbol of urban information modernization. With the continuous progress of social economy and the continuous improvement of LED display technology, people's understanding of LED display screens will become deeper and deeper, and its application fields will become wider and wider.

After nearly ten years of development and production, the current market has mainly formed the following LED display products:

GSM/CDMA text message control display (suitable for communication energy induction, etc.)

Monochrome text display

Dot matrix and digital tube hybrid display

Dual-color (red, green) multimedia video screen

Full color (red, green, blue) multimedia video screen

LED display classification method:

According to the display color, it is divided into: single red, single green, red and green double primary colors, red, green and blue three primary colors

According to the function of use, it is divided into: text display screen, multimedia video display screen, market display screen, bar display screen and other types of display screens

Divided according to the use environment: indoor display, outdoor display, semi-outdoor display

According to the diameter of the luminous point: (indoor and outdoor single/double primary color) Ф3mm, Ф3.7mm, Ф4.8mm, Ф5.0mm, Ф8.0mm, square 10mm, square 12mm, square 15mm, square 19mm, square 21mm, square 26mm, etc.

According to the density of luminous points: (outdoor full color) 3906 points, 2500 points, 1600 points, 1111 points, 625 points, etc.

LED display technical features:

Excellent effect: using dynamic scanning technology, the picture is stable without noise, the image effect is delicate and clear; the animation effect is vivid and diverse; the video effect is smooth and realistic

Easy maintenance: modular design, easy installation and maintenance.

Excellent quality: Imported luminescent materials, high-quality IC chips, noise-free high-power power supply 55mm Flexible LED Mesh Screen format: The display mode can be arranged by the user arbitrarily

Rich content: can display text, charts, images, animations, and video information

Large amount of information: the displayed information is not limited

2. How to classify LED displays

Classification according to application place

According to different application places, LED display screens can be divided into indoor and outdoor.

indoor screen

It is mainly used indoors. In the production process, the light-emitting crystals are first made into dot matrix modules (or digital tubes), and then the modules are spliced ​​into display unit boards of a certain size. According to user requirements, the display unit board is used as the basic unit splicing into the size required by the user. According to the size of pixels, indoor screens are divided into φ3, φ3.75, φ5, φ8, φ10, etc.

outdoor screen

It is mainly used outdoors. In the production process, the light-emitting crystal grains are first packaged into a single light-emitting diode, which is called a single light. The single light used to make outdoor screens generally uses a reflective cup with a concentrating effect to increase the brightness; Then a plurality of LED single lamps are packaged into a single pixel tube or pixel module, and the pixel tube or pixel module is formed into a dot matrix display unit box. According to user needs and display application places, a display unit box is used as the basis. The basic unit constitutes the required size. The box body should be sealed in design to achieve the purpose of waterproof and anti-fog, so that it can adapt to the outdoor environment. According to the density of pixels, the outdoor screen is divided into 4096 points, 2500 points, 2066 points, 1600 points, 1024 points and other specifications.

Sort by base color

According to the color of the LED used, the LED display can be divided into three types: single primary color, double primary color, and full color.

single color

Each pixel has only one color, and most of them use red, because red has higher luminous efficiency and can obtain higher brightness. Green can also be used, and it can also be mixed colors, that is, part of it is red, part of it is green, and part of it is yellow. .

dual primary color

Each pixel has two primary colors of red and green, which can be superimposed to produce yellow. Under the condition of grayscale control, through the change of different grayscales of red and green, a maximum of 65535 grayscale colors can be combined.

full color

Also known as the three primary colors, each pixel has three primary colors of red, green and blue. Under the condition of grayscale control, through the change of different grayscales of red, green and blue, it can well restore the colors of nature, and the combination of 16,777 , 216 colors.

Classification according to function

According to the functions of the screen, the LED display screen can be divided into four types: bar screen, graphic screen, video screen and digital hybrid screen.

Bar screen series

This type of display screen is mainly used to display text, which can be input by remote control, and can also be used online with a computer to send information through the computer. Can work offline. Because this type of screen is mostly made into a strip shape, it is called a strip screen.

Graphic screen series

This type of display is mainly used to display text and graphics, and generally has no grayscale control. It enters information by communicating with a computer. Compared with the bar screen, the advantage of the graphic screen is that the displayed fonts are rich and can display graphics. Compared with the video screen, the biggest advantage of the graphic screen is that one computer can control multiple screens and can be displayed offline .

Hybrid screen series

Digital screen is the cheapest LED display screen, which is widely used in stock exchange display, bank exchange rate, interest rate display, various price lists, etc. In most cases, a bar screen is installed on the digital screen to display greetings, notifications, advertisements, etc. Support remote control input.

Video series

There is a one-to-one mapping relationship between the screen pixels of this type of display screen and the pixels of the control computer monitor. There are 256 levels of grayscale control, so its expressiveness is extremely rich. Equipped with a multimedia card, the video screen can also play video signals. The video screen has good openness, has no restrictions on the operating system and software, and can reflect the display of the computer monitor in real time.

3. Screen size design selection

When designing the screen size, there are three important factors:

The need to display content

site space conditions

Display unit template size (indoor screen) or pixel size (outdoor screen)

The resolution of ordinary LED display is generally up to 768 rows × 1024 columns. Special display screens can exceed this limit, and the common method is to combine two screens; the other is to design circuits with ultra-high-speed chips, but the cost is relatively high.

The following are the design reference dimensions of the indoor screen:

The dot pitch of 3.0mm is 4.00 mm, and the maximum size of the screen is about: 2.0 meters (height) × 3 meters

The dot pitch of 3.75mm is 4.75 mm, and the maximum size of the screen is about: 2.5 meters (height) x 4 meters

The dot pitch of 5.0mm is 7.62 mm, and the maximum size of the screen is about: 3.7 meters (height) × 6 meters

When designing the geometric dimensions of the indoor display, it should be based on the size of the display unit template. The resolution of a unit template is generally 32 rows × 80 columns, that is, a total of 2048 pixels, and its geometric dimensions are as follows:

The size of the 3.75mm unit template is: 153 mm (height) × 306 mm (width)

The size of the 5 mm unit formwork is: 244 mm (height) × 488mm (width)

The size of the outer frame of the indoor display screen can be determined according to requirements, and generally should be proportional to the size of the screen body. The size of the outer frame is usually 4cm-10cm (per side).

For outdoor screens, the pixel size must first be determined. In addition to the needs of display content and site space factors mentioned above, the selection of pixel size should also consider the installation position and viewing distance. If the distance between the installation location and the main body is farther, the pixel size should be larger, because the larger the pixel size, the more light-emitting tubes in the pixel, the higher the brightness, and the farther the effective viewing distance. However, the larger the pixel size, the lower the pixel resolution per unit area, and the less content displayed.

4. Selection of power consumption and power requirements

The power consumption of the display screen is divided into average power consumption and maximum power consumption. Average power consumption, also known as working power, is the actual power consumption at ordinary times. The maximum power consumption is the power consumption in extreme situations such as startup or full brightness. The maximum power consumption is an element that must be considered for AC power supply (wire diameter, switch, etc.). Power consumption of φ5 mm display screen:

Average power consumption: 200W/square meter; maximum power consumption: 450W/square meter φ3.75mm display power consumption = φ5 mm display power consumption × 2.5 times The display is a large precision electronic device, for safe use and To work reliably, its AC220V power input terminal or the AC220V power input terminal of the microcomputer connected to it must be connected to the ground.

Note: The AC220V power input ground terminal of the microcomputer has been connected with the chassis of the microcomputer.

Special considerations for outdoor screens

The main problems of outdoor screens are as follows:

The display screen is installed outdoors, often exposed to the sun and rain, the wind blows the dust cover, and the working environment is harsh. Wet or severely damp electronic equipment may cause a short circuit or even a fire, resulting in failure or even a fire, resulting in losses. The display may be subject to strong electric and magnetic attacks caused by lightning.

The ambient temperature varies greatly. When the display screen is working, it will generate a certain amount of heat. If the ambient temperature is too high and the heat dissipation is poor, the integrated circuit may not work properly, or even be burned, so that the display system cannot work normally.

The audience is wide, the viewing distance is required to be far, and the field of vision is required to be wide; the ambient light changes greatly, especially it may be exposed to direct sunlight.

In view of the above special requirements, outdoor display screens must:

a. The screen body and the joint between the screen body and the building must be strictly waterproof and leak-proof; the screen body must have good drainage measures, and once water accumulation occurs, it can be discharged smoothly.

b. Install lightning protection devices on display screens and buildings. The main body and shell of the display screen are well grounded, and the grounding resistance is less than 3 ohms, so that the large current caused by lightning can be discharged in time.

c. Install ventilation equipment to cool down, so that the internal temperature of the screen is between -10°C and 40°C. An axial flow fan is installed above the back of the screen to discharge heat.

d. Select an industrial-grade integrated circuit chip with an operating temperature between -40°C and 80°C to prevent the display from being unable to start due to the low temperature in winter.

e. In order to ensure long-distance visibility in the case of strong ambient light, ultra-high brightness light-emitting diodes must be selected.

The display medium adopts a new type of wide viewing angle tube, which has a wide viewing angle, pure colors, consistent coordination, and a life span of more than 100,000 hours. The outer packaging of the display medium is currently the most popular square cylinder with a cover, sealed with silicone, and without metallized assembly;