The large LED display is a digital flat panel display. This requires it to display a variety of information such as text, graphics, animations, images, video programs. The purpose of the full-color LED display is to create a giant color display. Large LED displays have many similarities to flat panel displays such as plasma displays and large-screen rear projection TVs. In contrast, LEDs may be more difficult to distribute, drive, reduce power, improve efficiency, restore color, and maintain consistency than other flat panel displays. This is because the light-emitting diode is an innocent device, the switching time is nanosecond, and there is no memory function. In addition, the display area is large, the signal transmission distance is long, and the most advanced COG, SOB and other large integrated bodies cannot be used. The circuit method is manufactured. The following is a brief introduction to the processing of the image signal on the LED display screen. LED display screens generally have two methods for processing image signals: One method is to use a dedicated large-screen signal processor to convert the interlaced television signal into a progressive scan signal and then play it on a large screen. The high-performance processing function can process up to 10 bits or more, and perform interpolation calculation, motion prediction and compensation, and scan conversion when performing scan conversion. Nowadays, high-end large-scale LED screens also use this method, and carry out more image signal processing, trying to upgrade the signal to the broadcast level, of course, the effect is better. The computer image is also processed by this processor and then sent to the large screen display. Processing techniques are constantly evolving and many new algorithms have been proposed. This method is widely used by the large-size rear projection TVs and plasma large-screen TVs that we are familiar with, and the effect is much better than that of ordinary TVs. In this case, the output signal is usually described in the converted signal format, which is more accurate. Another method is a multimedia method, commonly referred to as a synchronous screen method, which captures television signals with a conventional multimedia card and performs demodulation, filtering, and timbre separation. After the image signal is A/D converted, it is MPEG encoded and compressed for storage. Decompress it during playback and watch it directly on your computer monitor. The signal sent to the big screen is obtained from the DVI interface or graphics card of the computer through a dedicated interface card, and some processing is performed on the interface card. At this time, the large screen is actually equivalent to the monitor of the computer or a part thereof, which is usually called a window, and can realize one-to-one synchronous display. Since the computer monitor is progressively scanned, if the frame is not subjected to the frame drawing process, the display format of the large screen is the format of the monitor. For example, the VGA format is a progressive scan format with a pixel count of 640x480, and its scan update rate is 75 Hz. However, the 75Hz progressive scan signal here is not an improvement of the image source itself. The quality of the image is not improved. Actually, it is worse than the level of 50Hz interlaced scanning. It is similar to the effect of DVD or VCD, which is often confused. The place. As for some screens, the screen is changed. For example, the even-numbered screen information is discarded, and only the odd-numbered screen information is sent for display, and the effect is of course worse. Incidentally, the situation of non-video programs is relatively simple, although some game animations also require good continuity, but for animations played on large screens, the screen update rate is more than 10 Hz. The display screen controlled by the embedded controller or the single-chip microcomputer, the program is generated by the controller, and is limited by the processing capability of the controller, and the speed of providing the picture is not fast enough, which may cause the picture to be discontinuous. The most typical phenomenon is that the strip screen controlled by the single-chip microcomputer is not smooth but jumps when the text moves left or right. Both experience and calculations can be drawn. A strip screen consisting of 10 16XI6 dot matrix characters. If the full screen is to be shifted to the left at a speed of 5 seconds, its frame frequency must be above 15 Hz in order to smooth the motion. Optical Fibre To Rj45 Converter,Sc To Sc Coupler,Sc Duplex Adapter,Sc To St Adapter Ningbo Fengwei Communication Technology Co., Ltd , https://www.fengweifiberoptic.com