How to design a long-distance transmission scheme of VGA signal for large-screen display project

Now the large screen display project VGA signal transmission mainly uses the VGA cable as the main transmission medium. Usually, some VGA / RGB cables are used, such as VGA3 + 4, VGA3 + 6, RGB75-2 / 3 cables. For longer distances, consider using optical fiber as the transmission medium; these two transmission schemes have their own advantages and disadvantages. The advantage of using VGA cable transmission is that the transmission distance is about 0-20 meters, the transmission image is clear, no trailing, heavy Low cost; the disadvantage is that the transmission distance is between 30-100 meters, the transmission image is poor, and the quality of the selected cable is not good, there will be smearing, snowflakes, ghosting, etc., even if a VGA long-line driver is installed The effect is not necessarily completely solved (it will damage the brightness and contrast of the VGA signal), and the cost is relatively high; using fiber optic transmission, the cost is very expensive. At present, the single transmission channel on the market is about 10,000 to 30,000 yuan. It is unbearable to customers, unless it is used in special engineering occasions of a few kilometers to tens of kilometers; based on the current use of VGA signal transmission, Beijing Easy Control Innovation Technology Development Co., Ltd. launched a series of twisted pair V GA transmitter solution, the transmission distance can be from 0 to 600 meters, the transmission image resolution is up to 1400 * 1280/85 Hz, and the transmission image is clear, no tailing, no ghosting, no delay, and the price is low; One CAT 5 / CAT 5 or more unshielded twisted-pair network cable can simultaneously transmit 1 VGA signal and audio signal. This technology encodes H and V signals to RGB signals and sends them after emphasis processing. Only CAT-5 cable is used. Three pairs of twisted pairs complete the balanced encoding and decoding of RGBHV signals of VGA, SVGA, SXGA, XGA, and SXGA, and use long-distance high-frequency compensation to emphasize the processing, with a bandwidth of up to 350MHz. The receiver uses the industry's unique balanced input signal buffer, ground potential isolation, variable gain amplification, balanced / unbalanced conversion, five-stage pole weighted equalization compensation, common mode signal recovery, output gain adjustment, co-frequency signal decoding, high fidelity Multi-level broadcast-level video signal processing technology such as video distribution, also has continuous brightness and contrast control, and an extra pair of twisted pairs can transmit audio / RS232 / RS422 / RS485 signals, which is ideal for large-screen display engineering VGA signal transmission Choose a product,

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