The development of products is inseparable from the real-time replacement of technology. Since the development of the full-color LED display industry, numerous display manufacturing technologies have been accumulated. Among them, the birth of the full-color LED display is one of the technical achievements. At present, LED full-color displays are widely used, and their technical strength is gradually rising. So, what important display technologies does LED full-color displays cover? Today, the editor leads everyone to discuss the shadow elimination technology of full-color full-color led display! Full-color LED display's shadow-removal technology Full-color LED display's shadow-reduction technology can make the display screen more delicate and make the screen display reach high-definition image quality; low power consumption can save energy during long-term use of full-color LED display The method meets the requirements of low-cost applications and energy-saving and environmental protection; the higher the refresh rate, the more stable the display screen, which provides technical support for fine and high-quality displays, and this display effect also makes the human eye look fatigue-free, and can meet the needs of high-speed shooting. It is exactly the same, which has promoted the improvement of all aspects, and has also strongly promoted the development of the entire full-color LED display application technology. Current cancellation technology for full-color LED display
Full color led display
Smear phenomenon
Why is the de-imaging effect so important in the LED full-color display? Because full-color LED display applications are often in the state of looping video, 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 bright at the moment to appear dim , This is called smear phenomenon.
The main causes of smear phenomenon are as follows:
① Graphics card driver problem. You can try to update the graphics card driver or reinstall the graphics card driver. At the same time, it is recommended to adjust the resolution and refresh rate, which may also be related to the response time of the LCD.
② Graphics card problem. You can try to re-plug and clean the golden fingers, and at the same time, you can observe whether the graphics card fan is operating 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 this cable is connected properly and whether there is any looseness. You can try a good quality VGA cable, and the VGA cable should be farther away from the power cord.
⑤Display problem. Connect the monitor to other normal computers. If the problem persists, it may be a monitor problem.
The smear phenomenon was a technical problem that was difficult to solve in the industry earlier. This is also related to the anti-shadow technology of the full-color LED display. If the current anti-shadow effect of the full-color LED display is poor, the smear phenomenon will affect the quality of the display picture. . So in terms of high-definition display on a full-color LED display, the shadow elimination technology is very important.
Full color led display
In addition, since each column line and row line of the full-color LED display has parasitic capacitance, the parasitic capacitance of the column line will affect the rising and falling edge time of the output port of the driver chip, which will affect the display effect of the chip when it is low gray, and Will cause smear phenomenon. The smear phenomenon is very obvious when the LED screen is "slashed": the LED lights in the normal display, the up and down (or left and right) positions will be dimmed.
When the ROW(n) row is turned on, the parasitic capacitance Cc will be charged by the lamp 1 that is turned on; when the ROW(n plus 1) row is turned on, the parasitic capacitance Cc will still be charged by the lamp 2, causing the lamp 2 to be dimly lit. .
The current erasing technology effectively eliminates the smear phenomenon. When the ROW(n) row and ROW(n plus 1) line change, the current erasing function automatically charges the parasitic capacitance Cc, when the ROW(n plus 1) row When it is turned on, the parasitic capacitance Cc will not be charged through the lamp 2, thereby eliminating the smear phenomenon.
In order to reduce the power consumption of full-color LED displays, low-power products have been introduced. By reducing the constant current inflection point voltage, the power supply voltage of the full-color LED display is reduced. This method also reduces the power supply voltage, so the 1V resistor that must be connected in series with the red light can be omitted. Through these two improvements, low-power, high-quality applications can be achieved.
In short, whether it is the shadow elimination technology or the current 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.
