[Auto Repair Knowledge]What is the format of the reversing display?

The video signal is an analog signal, which is composed of video analog data and video synchronization data, and is used at the receiving end to display images correctly. The details of the signal depend on the applied video standard or "system". There are currently three major systems in the world: NTSC (National Television Standards Committee, National Television Standards Committee), PAL (Phase Alternate Line) and SECAM (Sequential Transmission and Storage Color Television System, a television system adopted in France, SEquential Couleur Avec Memoire). In the household field, due to the different formats used, there are incompatibility situations. Take the resolution as an example. Some systems have 625 lines per frame (50 Hz), while others have only 525 lines (60 Hz) per frame. The latter is a standard adopted in North America and Japan, collectively referred to as NTSC. Usually, a video signal is generated by a video source, such as a camera, VCR, or TV tuner. In order to transmit images, the video source must first generate a vertical synchronization signal (V SYNC). This signal will reset the receiving end device (display device), ensuring that the new image is displayed from the top of the screen. After sending out the VSYNC signal, the video source then scans the first line of the image. After completion, the video source generates a horizontal synchronization signal and resets the receiving end to display the next line from the left side of the screen. And for each line of the image, a scan line and a horizontal synchronization pulse signal must be sent out. In addition, the NTSC standard also stipulates that the video source needs to send 30 complete images (frames) per second. If no other treatment is done, the flickering phenomenon will be very serious. To solve this problem, each frame is divided into two parts, each with 2 62.5 lines. One part is all odd-numbered rows, and the other part is all even-numbered rows. When displaying, scan the odd-numbered lines first, and then the even-numbered lines, which can effectively improve the stability of the image display and reduce flicker. At present, there are three main color TV systems in the world, namely NTSC, PAL and SECAM systems. The three systems are currently not unified, and our country adopts the PAL-D system. Generally, car display products are compatible with NTSC and PAL standards, and many products are compatible with the above three standards.Auto reversingRear view systemMeans that the on-board display device can cooperate with the visualReversing radarOr rear view carCamera, It becomes a visible reversing rear view system, so that when reversing, the viewing angle is larger and the blind area is smaller, plusrearview mirror, Can make car owners reversing worry-free. The vehicle-mounted display device must have a specific input interface to realize the automatic rear-view monitoring function for reversing. With this function, the screen can automatically switch to the rear-view state when reversing. Related: ·The solution to the fog in the car lights[汽车维修知识]
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