As an important role of multimedia teaching, video display platform has been widely used in classroom teaching. Projection teaching based on video display platform is convenient and effective, which is welcomed by teachers. However, in actual use, some teachers are not familiar with the performance of the equipment and are not skilled in technology, which leads to many problems in the use of video display stands. So what? Functions and advantages The video display platform is an advanced projection demonstration equipment. It clearly outputs objects, models, slides, slides, manuscripts, etc. It is transmitted to the display device by CCD digital camera, and digital video information can be stored in the computer. It can also be connected with projectors, AV monitors and other peripherals to form an ideal demonstration system, which can be conveniently applied to education, teaching, scientific research demonstration and other fields. 1, function At present, most video display stands have the functions of clarity of TV lines of more than 400 lines, vivid pictures, auxiliary lighting equipment and automatic white balance adjustment, which can adjust the color difference of manuscripts or films; It has practical functions such as zoom and autofocus, black and white color reproduction, positive and negative film flipping and so on. At the same time, it also has multi-channel signal input and output ports, which can easily connect computers, televisions, video recorders, DVD players and other equipment. It has the function of "centralized controller" in multimedia classrooms and forms a complete audio-visual teaching demonstration system with projectors. In addition, the video kiosk has also developed some other functions, such as connecting with a microscope to demonstrate microscopic phenomena. Video kiosks have long service life, small size, low noise and convenient use. It can replace the traditional physical projection, slide projector, film projector and so on. , truly realize multi-function and multi-purpose of one machine. 2. The advantage video display platform reduces the difficulty of projection teaching, reduces the labor intensity of teachers, and makes the making of teaching software more convenient. Teachers can demonstrate manuscripts and pictures on the spot. Through the rotation of the omni-directional camera, the objects on the shooting platform can be simply demonstrated, and some experimental phenomena and processes that are not suitable for observation can be shot live or enlarged without the limitation of the demonstration platform. It provides convenience for the combined use of various teaching software, and can flexibly demonstrate objects, experiments, manuscripts, pictures, slides, negatives, etc. At the same time, it also provides a good application interface for various analog video signals, which reduces the complexity of various media applications in the teaching process. Problems and shortcomings As mentioned above, the video display platform inherits and develops the advantages of traditional projection equipment and opens up an advanced application platform for audio-visual teaching. However, in the face of this new "weapon", most teachers can't skillfully apply it to teaching. For example, some teachers just use the video booth as a video switching tool or a simple demonstration, which is undoubtedly a waste for the high-end teaching equipment such as the video display booth. 1. Problems in teaching Some teachers use materials at will, but they don't pay attention to the processing of teaching information. Although they regard video kiosks as an audio-visual teaching tool, they ignore the quality and purpose of teaching. Secondly, some teachers can write freely on the traditional blackboard, but they are helpless in front of the video display platform and don't even know how to write on the blackboard. In fact, from the conventional projector to the video display platform, its biggest advantage is that it can write directly on the blackboard and reproduce it in real time on the projection screen, which is the blackboard writing function of the video display platform; In addition, in teaching practice, some teaching software is vivid and expressive, but it lacks corresponding teaching; Some use ready-made pictures or manuscripts, but lack the theme; Some teachers design software with improper length-width ratio, which makes it difficult to show it as a whole; Some softwares have uneven surfaces, dull pictures and unsatisfactory projection effects. Therefore, this requires teachers who take multimedia classes to make full preparations before class, and to process the collected teaching information, materials and materials in depth and in a targeted way, so that teaching can get twice the result with half the effort. 2. The video display stand for problems in operation is used to display pictures, manuscripts and objects remake by the camera. But in practice, some teachers always like to display the whole page of the presentation, because the font is small and easy to read clearly. The correct operation method should be partial presentation or key amplification. For another example, when presenting a large page of manuscripts or pictures, they cannot all be displayed on the screen. In this way, you have to turn the camera, adjust the focal length, and then display other parts, instead of moving the manuscript or picture, unless only a part is displayed. For another example, when demonstrating a real object, try to avoid the movement of the object as much as possible, because the camera will flicker due to insufficient fill light during the movement of the object; In addition, due to the weak illumination, the required aperture is large, and the picture is easy to blur. Generally speaking, when the subject is too bright or too dark, the picture will be blurred or projected with brightness; If the focal length is not adjusted properly, the picture will flicker, or the contrast is too large, or the color is distorted, which is the result of the defects of the video display itself. In a word, video display platform has been widely used in multimedia teaching. In the teaching process, we must master its characteristics and advantages in order to make the video display platform fully play its role.