I believe that many friends of projection engineering companies foresee such problems when installing and implementing projection display projects. When the projector projects computer signals, color distortion, text icon ghosting, smearing and other phenomena appear. The main reasons for this situation are: ( A) The VGA cable is too long, and the transmission distance of the VGA cable is generally 0-30 meters away; (b) The quality of the VGA cable used in the project is too poor. + 4vga, 3 + 6vga, 75-2vga cables, the quality of products produced by various manufacturers is also very different, it can be clearly seen from the thickness of the wire diameter; (3) too many contacts, some projection In the project, the VGA cable is transferred through multiple links, such as through the central control, distributor, selector, matrix, etc., and it is inevitable that the high-frequency signal of the VGA will be consumed. In addition, the VGA connector itself is not properly welded or has burrs. This makes it easy for ghosting and smearing.

 

    The cause of the above problems, I think the most concern of many engineering companies is to solve the problem as soon as possible, so that the project can be successfully completed and accepted, and the project funds can be recovered. As a solution provider specializing in large-screen projection display peripheral products for many years, Beijing Easy Control Innovation Technology Development Co., Ltd. always pays attention to the dynamic development of the industry and has launched two VGAYC150 and VGAYC50 long-line drivers. It is a professional solution for long-distance transmission of computer video signals using VGA lines. Output end devices (such as projectors, plasma displays, LCD monitors, etc.) caused by poor cable quality, too many contacts, etc. display color distortion, image, text ghosting, or smearing. Because the VGA signal will be attenuated through a long cable transmission, especially the high-frequency part, at the beginning of the cable, high-frequency compensation is used to emphasize the processing, and the high-bandwidth op amp circuit with a bandwidth of up to 300MHz enhances the VGA signal at high frequencies. The stepless RGB three colors are respectively subjected to high-frequency compensation and brightness compensation. The signal attenuated on the line is intentionally amplified, so that the entire signal frequency band is completely restored to the original state, thereby eliminating the tail phenomenon. The transmission distance of the VGA signal reaches a transmission distance of 50 meters to 200 meters, which can fully meet the VGA signal transmission of various long distances.