How to Solve the Smear of Full Color LED Display?

Full color led display applications are often in a state of looping video, and this dynamic display charges the parasitic capacitance on the column or line when switching, causing some LEDs that are not lit at this moment to appear dark light. This is called smear.

The main causes of smear are as follows:

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

2. Graphics card issue. You can try to re-plug and clean the gold finger, and you can observe whether the graphics card fan is working properly.

3. Data line problem. Need to replace the data line, or check if the data line is bent.

4. Screen line problem. That is, the VGA cable, checking if the wire is connected properly and there is no looseness. You can try to replace a good quality VGA cable, and the VGA cable should be farther away from the power cable.

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

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

The current subtraction technique effectively eliminates the smear phenomenon. When the ROW(n) row and the ROW(n+1) row are linefeed, the current smear function automatically charges the parasitic capacitor Cc, when ROW(n+1)  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 displays, low-power products have been pushed out. By reducing the constant current inflection point voltage, the power supply voltage of the LED display is lowered. In this way, because the power supply voltage is lowered, the voltage drop of 1V of resistance required for the red light to be connected can be omitted.Through these two improvements, which achieved low-power, high-quality applications.

In short, whether it is the shadow elimination technology or the current elimination technology, the most important function of the drive technology is to make the picture stable and clear. Just like the computer graphics driver, the picture quality is smooth, and finally realized the high-definition display of the full-color LED display.