LED display knowledge

- Mar 20, 2019 -

Introduction to the display


LED is the abbreviation of light emitting diode, referred to as LED. The LED display (LED panEL) is a display screen that displays various information such as text, text, graphics, images, animations, quotes, and television and video signals and is composed of an array of LED devices through a certain control method. As a new generation of display media, it has been widely used in exhibition centers, trading centers, auction centers, financial centers, information centers, securities, telecommunications, taxation, power supply, customs, courts, fire, stations, airports, terminals, talent markets, etc. Public places in the business hall.


Display performance


The LED display is divided into text LED display, graphic LED display, computer video LED display, TV video LED display and market LED display according to display performance. Quotes LED displays generally include LED displays for securities, interest rates, futures, etc.


Display color


The LED display is divided into a single primary color LED display (with pseudo color LED display), a dual primary color LED display and a full color (three primary color) LED display. According to the gray level, it can be divided into 16, 32, 64, 128, 256 gray LED display.


Monochromatic screens are typically constructed of red luminescent materials.


Dual primary color screens are typically constructed of red and yellow-green luminescent materials.


The three primary color screens are divided into full color, consisting of red, yellow-green (wavelength 570nm), blue; true color, consisting of red, pure green (wavelength 525nm), blue.


Basic light point


In the non-quote LED display, the indoor LED display can be divided into Φ3.0mm (62500 points/m 2), Φ3.7mm (44100 points/m 2), Φ4.8mm (27800 points) according to the LED single point diameter. /m 2), Φ5mm (17200 points / m 2), Φ8mm (10000 points / m 2) and other display;


The outdoor LED display can be divided into Φ8mm (10000 points/m 2), Φ12mm (3906 points/m 2), Φ16mm (2500 points/m 2), Φ26mm (1024 points/m 2) and other LEDs according to the pixel diameter. Display. In the market type LED display, the size of the digital tube can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6cm (3inch), etc.


Use environment


LED display screens are divided into indoor LED display, semi-outdoor LED display and outdoor LED display according to the use environment.


The indoor screen area generally ranges from less than 1 square meter to more than ten square meters. The dot density is high. It is used in non-direct sunlight or lighting environment. The viewing distance is several meters away, and the screen body does not have sealing and waterproofing ability.


The semi-outdoor screen is between the outdoor and the indoors. It has a high luminous brightness and can be used outdoors under direct sunlight. The screen has a certain seal, usually under the eaves or in the window.


The outdoor screen area is generally from a few square meters to tens or even hundreds of square meters, the point density is relatively thin (more than 1000-10000 points per square meter), the brightness of the light is 3000-6000cd / square meter (different direction, different brightness requirements), in the sun It is used under direct shooting conditions, and the viewing distance is several tens of meters away. The screen body has good wind, rain and lightning protection capabilities.


Installation method


In-line, stepped, hoisted, wall-mounted, front-maintenance, hinged.


Synchronous and asynchronous


Synchronous mode means that the LED display works in the same way as the computer monitor. It maps the image on the computer monitor in real time with a update rate of at least 30 fields/second, usually with multi-gradation color display capability. Can achieve multimedia promotional advertising effects.


Asynchronous mode means that the LED screen has the ability to store and play automatically. The edited text and non-grayscale pictures on the PC are transmitted to the LED screen through the serial port or other network interface, and then automatically played by the LED screen offline. Generally, there is no gray. The display capability is mainly used to display text information and can be multi-screened.


The main function of the capture card


The LED display is a special display medium that does not directly accept computer data and requires a series of transformations. The function of the capture card is to collect the display data of a high-speed computer (or multimedia display card), convert it, and down-convert it to the main controller.