The LED display is mainly for displaying various characters, symbols and graphics. The screen display information is edited by the computer, and is pre-positioned into the frame memory of the LED display screen via the RS232/485 serial port, and then displayed on a screen-by-screen basis. The display is colorful and works offline. LED display has wide application in various industries because of its flexible control, convenient operation, high stability and long service life.
The development of LED display has been more than 20 years old. Like other LCD splicing and engineering projectors, LED display has been accompanied by technological advancement and upgrading since its inception, displaying text content from the beginning to the later. Graphic and dynamic video. Currently widely used in outdoor advertising, stage performances, exhibitions, stadium events, conference centers and command centers.
LED display control system is also called LED display controller and LED display control card. It is the core component of the LED display, mainly responsible for receiving the picture and video display information from the computer serial port or DVI interface, placing it into the frame memory, and generating the serial display data that can be recognized by the LED display screen according to the partition driving method. Scan control timing.
LED display control system - asynchronous control
LED display asynchronous control system is also called LED display offline control system or offline card. The main control PC will display the information and various control commands to the control panel of the LED display screen through serial communication. The control card inside the LED display screen contains the single chip and the memory, and the control card in the screen stores the information. Then, it is displayed on the LED display according to the command.
Mainly used to display a variety of text, symbols and graphics or animation. The screen display information is edited by the computer, and is pre-positioned into the frame memory of the LED display screen through the RS232/485 serial port, and then displayed on the screen by screen, and the display mode is colorful and varied. Generally, there is no multi-gray display capability, which is mainly used for displaying text and simple graphic information, and can be multi-screened.
Its main features are: simple operation, low price and wide range of use. LED display simple asynchronous control system can only display digital clock, text, special characters. In addition to the function of the simple control system, the LED display graphic asynchronous control system has the biggest feature of controlling the display screen content by region. Support for analog clock display, countdown, picture, table and animation display. With time switch, temperature control, humidity control and other functions.
The asynchronous graphic LED display mainly includes:
1 Adapter upper computer adopts serial port RS232 protocol and goes online through RS232-RS485 adapter. The adapter is optically isolated.
2 The control card receives the information to be displayed and various control commands transmitted by the PC through serial communication. The control card contains the MCU and the memory. The control card in the screen stores the information and then displays it on the LED display according to the command. Features are as follows:
a. When the number of vertical points is less than 128, the number of lateral points can be as long as 2000 points. If the vertical direction is 16 points, the horizontal direction is up to 4000 points.
b, can be controlled by computer, or can be displayed offline.
c. The large-capacity memory supports a one-two-character font Chinese character font and a large number of proprietary fonts, and has a storage capacity of 16 screens.
d, with a perpetual calendar real-time clock function.
e. The information can be saved for 1 year after power off.
PC programming software dedicated communication LED display LED programming software, in line with LED graphic display control protocol. Compilation and broadcast of text and image programs of multiple monochrome or dual-primary LED displays of different lengths and widths. Send up to 16 shows at a time.
A single network cable (four cores) uses a four-wire system: one pair of differential twisted pair reception and another pair of differential twisted pair transmission. The communication distance is 1200 meters. It adopts bus-type networking structure and has a maximum load of 32 lower-level machines.
LED graphic display control protocol
a. This agreement supports dot matrix monochrome and dual primary color text networking LED displays.
b. The networking form is bus type, the upper computer is a PC computer, and the lower computer is a single chip microcomputer in the LED display control board. The four-wire system is adopted, and the online protocol is RS485.
c. Support TCP/IP protocol transmission.
d. The upper computer adopts the serial RS232 protocol to be converted and put online.
control card
There are many types of control cards on LED displays, and there are many companies that produce control cards, such as Mosier, Lingxingyu, Zhongqing, Yangbang, Yukuo, Jinhan, etc. Simply said: Full color synchronization card, asynchronous offline card, full color video offline card With the rapid development of LED display in the past 2 years, the market for LED control card has become more extensive, especially in 2009. U disk LED control card is currently used the most, can be connected to the computer with a serial port, can also use U disk to transfer information, save the computer, free wiring, support analog clock, water border, U disk LED control card can save the computer, save wiring.
C type card (partition card) (U disk and serial port dual communication function)
1, support 4 sweeps, 8 sweeps, 16 sweeps of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2, support the flow of water border and analog clock function, more prominent display content.
3. The maximum controllable range is 114688 points, and the number of double-color points is halved. At the same time, 4 08 interfaces and 4 12 interfaces are built in, which can be expanded to 8 interfaces.
4, display function: support text, pictures, animation, EXCEL form, time, temperature, inverted (positive) timing.
5, can be used to make door screens, poster screens, car screens and other types of screens.
6, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
7, with serial communication and U disk input information dual functions.
8, support a U disk management multi-block display function, convenient multi-screen centralized management.
E-type card (time partition) (U disk and serial port dual communication function)
1, support 4 sweep, 8 sweep, 16 sweep, support a variety of indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2, the maximum controllable range of monochrome 40,960 points, two-color points halved, built-in three 08 interfaces and three 12 interfaces, can be extended to eight interfaces.
3, display functions: text, pictures, animation, time, temperature, inverted (positive) timing.
4, can be used to make door screens, poster screens, car screens and other types of screens.
5, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
6, with serial communication and U disk input information dual functions. 7, support a U disk management multi-block display function, convenient multi-screen centralized management.
G type card (serial communication function)
1. Same as above, support 4 sweep, 8 sweep, 16 sweep of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2, support the flow of water border and analog clock function, more prominent display content.
3. The maximum controllable range of the same color is 114688 points, the number of double color points is halved, and there are 4 08 interfaces and 4 12 interfaces, which can be expanded to 8 interfaces.
4, display functions: text, pictures, animation, EXCEL form, time, temperature, inverted (positive) timing.
5, can be used to make door screens, poster screens, car screens and other types of screens.
6, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
7, with serial communication function.
F-type card (time partition) (serial communication function)
1, support 4 sweep, 8 sweep, 16 sweep of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2. The maximum controllable range is 40960 pixels, the number of double color points is halved, and 3 08 interfaces and 3 12 interfaces are built in, which can be expanded to 8 interfaces.
3, display function: text, picture, animation, time, temperature, inverted (positive) timing.
4, can be used to make door screens, poster screens, car screens and other types of screens.
5, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
6, with serial communication function. According to different needs, you can use the serial port to connect to the computer, or you can use the U disk to transfer information. U disk control card can save the computer, save wiring, control 100,000 points, one card.
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