1, according to the use of the environment is divided into indoor, outdoor and semi-outdoor
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 indoor display is mainly based on the dot matrix module, because the brightness of the display is not high in indoor use, and the dot matrix module has a high cost performance.
The outdoor screen area is generally from a few square meters to tens or even hundreds of square meters, the dot density is relatively thin (mostly 1000-4000 points per square meter), the luminous brightness is 3000-6000cd/square meter (different orientation, different brightness requirements), available in sunlight Used under direct shooting conditions, the viewing distance is several tens of meters away, and the screen body has good wind, rain and lightning protection capabilities.
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.
2, according to the color is divided into monochrome, double primary color, three primary colors
Monochrome refers to a luminescent material with only one color on the display, mostly single red.
Dual primary color screens are typically constructed of red and yellow-green luminescent materials.
The three primary color screens are divided into full color, composed of red, green (wavelength 570 nm), blue; and true color, consisting of red, pure green (wavelength 525 nm), blue.
3. Synchronous and asynchronous by control or usage
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 an 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 of storage and automatic playback. The edited text and 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.
4, divided by pixel density or pixel diameter
Since the LED dot matrix module used in the indoor screen has relatively uniform specifications, it is usually divided according to the pixel diameter of the module:
∮3.75mm 44100 pixels/square meter ∮4.8mm 27800 pixels/square meter ∮5.0mm 17200 pixels/square meter At present, the common indoor screen dot matrix screens are: P4, P6, P7.62, P8, P10. The pixel diameter of the indoor screen does not substantially exceed 10 mm. The main reason is the visual distance and image display effect.
The pixel diameter and pixel pitch of the outdoor screen currently do not have a very uniform standard, and there are about 2500 points, 3086 points, 3906 points, 5102 points, etc. per square meter of pixels. Outdoor screens are commonly available: P10, P12, P16, P20, P25. Basically, LED light-in-line modules are mainly used. Because outdoor screens have to overcome the effects of light, LED lights need to be bright. At the same time, the visible distance of the display screen is related to the pixel diameter, so the outdoor screen is basically P10 or more.
5, according to the performance
LED display screen is divided into: monochrome graphic screen, two-color graphic screen, dual-primary color screen, synchronous display, three-color screen (full color screen), monochrome screen, two-color strip screen, market display, Various display cards, etc. The market LED display generally includes LED displays for securities, interest rates, futures, and the like.
(1), graphic display: support TXT, BMP and other documents, can display a simple plane picture. At the same time, it also has the function of offline operation. If the display content is not changed, you can open the control panel directly, and directly open the power supply of the screen. The display mode supports more than ten ways, such as expansion and instant. The content stay can be adjusted freely between 0-255 seconds (including static), and can automatically display the different contents that the user wants to display. It can be divided into long-term, temporary, and real-time. After being produced, it can be sent to the screen through RS232 and RS485 serial ports. display.
(2), video display: display content real-time synchronization, you can easily select the size of the display screen, color change combination a total of 256X256X256 = 16,777,216 kinds, scanning field frequency is greater than 200 Hz, the human eye can hardly see the scan line, achieve gamma Ma high speed, no gray scale loss correction design, parameters can be selected by the user, easily realize various gray level adjustment and brightness control functions, make the image color soft and realistic, better reproduce the image layer and stereoscopic effect, make LED The best display of the line in various ambient light. Equipped with advanced and complete control, production and playback software, easy to learn and use, with dozens of playback modes, can play video information, with automatic black screen function of computer switch machine, improve the service life of the display, and avoid the computer switch machine When the display interface is messy.
(3), strip screen: usually one or two lines of monochrome or two-color, you can use a dedicated remote control. With offline operation, the control unit can be turned off after the display content editing is completed and sent to the display. There are three types of display content storage: permanent, temporary and real-time. It can display different contents by scrolling and can display 4000 Chinese characters. After the production, it is generally sent to the screen through RS232 serial port and controlled by remote control. The communication line adopts twisted pair cable, which has strong anti-interference ability. The communication distance is within 100 meters, RS232 interface is used, and RS485 interface is used within 100-500 meters.
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