LED display control card is the core part of the LED display. The LED display controller is responsible for receiving the screen display information from the serial port of the computer, placing the frame memory, generating the serial display data and the scanning control timing required for the LED display by the partition drive mode, which is divided into the synchronous LED control card And asynchronous LED control card.
1, synchronous LED control card:
Mainly used for real-time display of video, graphic, notification and so on. Mainly used for indoor or outdoor full color large screen display. Synchronous LED control card system control LED display works basically the same as the computer monitor, it is at least 60 frames / sec update rate corresponding to real-time mapping of computer monitors on the image, usually with multi-grayscale color display capability , Can achieve the effect of multimedia advertising. Its main features are: real-time, expressive force, the operation is more complex, high prices. A set of synchronous LED display control card system generally by the sending card, receiving card, and DVI graphics card.
2, asynchronous LED control card, also known as offline LED control card or offline card:
Mainly used to display a variety of text, symbols and graphics or animation based. Screen display information by the computer editing, RS232 / 485 serial port pre-installed in the LED display frame memory, and then screen-by-screen playback, cycle, display colorful, varied and varied. Its main features are: simple operation, low price, the use of a wide range. Easy asynchronous LED control card can only display digital clock, text, special characters. Graphic Asynchronous LED control card in addition to a simple control system functions, the biggest feature is the ability to control the display area of the screen.
With the rapid development of LED industry, LED display control card market demand for space is also increasing, and wireless LED control card can be a good customer to meet the unified management, cluster sent to the needs of the market. Such as residential publicity LED screen, car screen, government projects, mobile, telecommunications, bank door screen, bulk installation, easy to manage, to maintain a state without maintenance, is the best choice for users.
Then the user in the use of control card, in order to avoid unnecessary losses, should pay attention to the following matters:
1, the control card to keep working in a dry, relatively stable environment, too high temperature, and humidity, there are many dusty environment, the control card is extremely unfavorable.
2, in the absence of power failure, is strictly prohibited plug the serial port, so as to avoid improper operation and damage the computer serial port and control card serial port.
3, in the system charged work is strictly prohibited to adjust the control card input voltage, so as to avoid improper adjustment, the voltage is too high and damage the computer serial port and control card serial port. Control card normal operating voltage of 5V. Adjust the power supply voltage, you should remove the control card, with a multimeter to measure the slow adjustment.
4, is strictly prohibited control card grounding side and the display frame shorted, otherwise the display frame once gathered static, easy to damage the computer serial port and control card serial port, resulting in unstable communications, static electricity will burn out the control card and screen On the display unit. Therefore, in the outdoor screen or communication distance, it is recommended that users must use the serial isolator to avoid the ground loop, surge, lightning, hot swap and other harsh environments on the computer serial port and control card serial port damage.
5, must ensure that the control card and the computer serial port of the correct connection, so as not to enter the signal is not correct damage to the control card serial port and computer serial port.
6, the control card do not connect to the unit board. To try to lead directly to the switching power supply, the unit board in the process of voltage and its instability. Will cause the control card when the slow, serious can not communicate or run the program to run back to repair, especially the U disk control card, in the case of voltage instability may not read the disk or read the disk error.
7, indoor, 16 sweep unit board should not take the whole screen debugging, a lot of indoor monochrome or two-color, or even full color, and then no debug state directly connected to the control card power, there may be a large area burned behind the unit board sweep drive 4953 chip The Debugging only one unit board debugging, debugging is completed unplug the power, then control card.