Causes and solutions of smearing on LED full-color display

LED full-color display applications are often in the state of looping video playback, and this dynamic display will charge the parasitic capacitance on the column or row line when the row is switched, causing some LED lights that should not be on at this moment to appear dim. This is called a smear phenomenon.

The main reasons for smearing are as follows:

① Graphics card driver problem. You can try to update the graphics card driver or reinstall the graphics card driver, and it is recommended to adjust the resolution and refresh rate, which may also be related to the response time of the LCD monitor.

② Graphics card problem. You can try to unplug it again, and clean the gold fingers, and at the same time, you can observe whether the graphics card fan is running normally.

③Data line problem. Need to replace the data cable to see, or check whether the data cable is bent.

④ Screen line problem. That is, the VGA cable, check whether the cable is connected normally and whether there is any loose problem. You can try a good quality VGA cable, and the VGA cable should be farther away from the power cable.

⑤ Display problem. Connect the monitor to another normal computer. If the problem persists, it may be a monitor problem.

The shadow elimination technology of the LED display screen can make the display screen more delicate, so that the screen display can reach high-definition image quality; low power consumption can save electricity during the long-term use of the LED display screen to meet the requirements of low-cost applications and energy saving and environmental protection; the higher the refresh rate High, the display screen is more stable, providing technical support for fine and high-quality display, and this display effect also makes the human eye watch without fatigue, and can meet the needs of high-speed shooting. This is also the case, which has promoted the improvement of various aspects, and also strongly promoted the development of the entire LED display application technology.

The current erasing technology effectively eliminates the smear phenomenon. When the row of ROW(n) ​​and the row of ROW(n+1) are changed, the current erasing function automatically charges the parasitic capacitance Cc. When the row of ROW(n+1) When turned on, the parasitic capacitance Cc will not be charged by the lamp 2, thereby eliminating the smear phenomenon.

In order to reduce the power consumption of LED display, low power consumption products have been introduced. By reducing the constant current inflection point voltage, the power supply voltage of the LED display is reduced. This method also reduces the power supply voltage, and can save the resistor with a voltage drop of 1V that must be connected in series for the red light. Through these two improvements, low power consumption and high quality applications can be achieved.

In a word, whether it is the shadow elimination technology or the current shadow elimination technology, the main function of the drive technology is to make the picture stable and clear, just like the graphics card driver of the computer, to ensure the smooth picture quality, and finally realize the precise high-definition display of the full-color LED display.

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