How to distinguish the type and model of LED display_full color LED display|outdoor LED display

1. According to the performance of the LED display, the LED display can be divided into: single-color graphic LED display, two-color graphic LED display, dual-color visual LED display, synchronous LED display, three-color visual screen (full color LED display), single-color bar screen, two-color bar screen, quotation LED display, various LED display boards, etc. Market LED displays generally include LED displays for securities, interest rates, futures and other purposes.　　(1). Bar screen: usually one or two lines of single color or dual color, can use special remote control. With offline operation function, that is, the control machine can be turned off after the display content is edited and produced and sent to the led display. There are three storage methods for display content: permanent, temporary and real-time. Different content can be scrolled and displayed. 4000 Chinese characters can be displayed. After production, it is usually sent to the screen through the RS232 serial port and controlled by the remote control. The communication line adopts twisted pair, which has strong anti-interference ability. The communication distance within 100 meters uses RS232 interface, and within 100-500 meters uses RS485 interface.　　(2). Graphic display: It supports TXT, BMP and other files and can display simple plane pictures. At the same time, it also has the function of offline operation. If the display content does not change, you can directly turn on the power of the screen without turning on the control machine. The display mode supports more than ten modes such as unfolding and instantaneous. The content stay can be adjusted arbitrarily between 0-255 seconds (including static), and the different content that the user wants to display can be automatically cycled. It is divided into three types: long-stay, temporary and real-time. After production, it is sent to the screen through the RS232 and RS485 serial ports. show. (3). Video display screen: The display content is synchronized in real time, and the size of the display screen can be selected easily and arbitrarily. There are a total of 256X256X256u003d16,777,216 kinds of color change combinations. The scanning field frequency is greater than 200 Hz. The human eye can barely see the scanning line. Ma high-speed, no gray-scale loss correction design, parameters can be selected by the user, easily achieve various gray-scale adjustment and brightness control functions, make the image color soft and realistic, better reproduce the image hierarchy and three-dimensional sense, so that the LED It shows the best display effect under various ambient light. Equipped with advanced and complete control, production and playback software, easy to learn and easy to use, with dozens of playback methods, can play video information, and have the function of automatic black screen on and off of the computer, which improves the service life of the display screen and avoids the computer on and off At times, the display interface is messy and unintentional. 2. Divided by pixel density or pixel diameter. Because the LED dot matrix module specifications used in indoor screens are relatively uniform, the main divisions according to the pixel diameter of the module are usually: 　　∮3.75mm 　44100 pixels/square meter∮4.8 mm　 27800 pixels/square meter ∮5.0mm 　17200 pixels/square meter At present, common indoor LED display dot matrix screens are: P4, P6, P7.62, P8, P10. The pixel diameter of the indoor LED display basically does not exceed 10mm. The main reason is the visual distance and image display effect.　　 There is currently no uniform standard for the pixel diameter and pixel pitch of outdoor LED displays. According to the number of pixels per square meter, there are approximately 2500 dots, 3086 dots, 3906 dots, 5102 dots, etc. Common outdoor screens are: P10, P12, P16, P20, P25. Basically, LED light plug-in modules are mainly used. To overcome the influence of light, outdoor screens need high brightness of LED lights. At the same time, the visible distance of the LED display is related to the pixel diameter, so the outdoor LED display is basically P10 or more.　　3. According to the color, it is divided into single color, double primary color, and three primary colors. 　　Monochrome refers to the luminescent material of the display screen with only one color, mostly single red.　　 dual primary color screens are generally composed of red and yellow-green luminescent materials.　　 three primary color screens are divided into full color (full color), composed of red, green (wavelength 570nm), blue; and true color (nature color), composed of red, pure green (wavelength 525nm), blue. 4. According to the control or use mode, the synchronous and asynchronous synchronous methods mean that the working mode of the led display is basically equivalent to the computer monitor, and it maps the image on the computer monitor in real time with an update rate of at least 30 fields/sec. , Usually has the ability of multi-gray color display, which can achieve the effect of multimedia advertising. Asynchronous mode means that the LED screen has the ability to store and automatically play. The edited text and non-grayscale pictures on the PC are transferred to the LED display through the serial port or other network interface, and then the LED display is automatically played offline, generally not Multi-grayscale display capability, mainly used to display text information, and can be connected to multiple screens. 5. According to the usage environment, it is divided into indoor LED display, outdoor LED display and semi-outdoor LED display. The indoor LED display area generally ranges from less than 1 square meter to more than ten square meters. When used in a lighting environment, the viewing distance is a few meters away, and the screen does not have the ability to seal and waterproof. The indoor LED display is dominated by dot matrix modules, because the brightness of the LED display is not high when used indoors, and the dot matrix module is very cost-effective. Outdoor LED display areas generally range from a few square meters to tens or even hundreds of square meters, with relatively sparse dot density (mostly 1000-4000 dots per square meter), and luminous brightness between 3000-6000cd/square meter (different orientations and different brightness requirements). Used in direct sunlight, the viewing distance is tens of meters away, and the screen has good wind and rain resistance and lightning protection capabilities.　　 Semi-outdoor LED display is between outdoor and indoor. It has high luminous brightness and can be used outdoors in non-direct sunlight. The screen is sealed to a certain extent, usually under the eaves or in the shop window.