interactive bulletin board.Infrared touch screen is utilizedA dense infrared matrix in the X and Y directions detects and positions the user's touch. The infrared touch screen is equipped with a circuit board frame on the front of the display. The circuit board arranges infrared transmitting tubes and infrared receiving tubes on the four sides of the screen, one by one to form a horizontal and vertical infrared matrix. When the user touches the screen, the finger blocks the two infrared rays passing through the position, so that the position of the touch point on the screen can be determined. Any touch object can change the infrared on the contact to realize touch screen operation. In early concepts, infrared touch screens had technical limitations such as low resolution, limited touch methods, and susceptible to environmental interference and malfunction, so they once faded out of the market. After that, the second generation of infrared screens partially solved the problem of anti-light interference. The third and fourth generations also improved the resolution and stability performance, but they did not make a qualitative leap in key indicators or comprehensive performance. However, anyone who knows touch screen technology knows that infrared touch screens are not affected by current, voltage and static electricity and are suitable for harsh environmental conditions. Infrared technology is the ultimate development trend of touch screen products. Touch screens using acoustic and other material technologies have their insurmountable barriers, such as damage and aging of a single sensor, fear of contamination of the touch interface, destructive use, and complicated maintenance. As long as the infrared touch screen truly achieves high stability and high resolution, it will certainly replace other technical products and become the mainstream of the touch screen market. In the past, the resolution of infrared touch screens was determined by the number of infrared pairs in the frame. Therefore, the resolution is low. The main domestic products on the market are 32x32 and 40X32. In addition, it is said that infrared screens are more sensitive to lighting environmental factors and are more sensitive to light changes. In the old age, it will be misjudged or even crashed. These are the weaknesses of infrared screens sold by domestic non-IR touch screen domestic agents. The resolution of the latest generation of the fifth-generation infrared screen depends on the number of infrared pairs, scanning frequency and difference algorithm. The resolution has reached 1000X720. As for the infrared screen, it is unstable under light conditions. From the second-generation infrared touch screen, From the beginning, the weakness of anti-light interference has been overcome. The fifth-generation infrared touch screen is a new generation of intelligent technology products. It achieves 1000 * 720 high-resolution, multi-level self-adjusting and self-recovering hardware adaptability and highly intelligent discrimination. It can be used in a variety of harsh environments for a long time. Use it arbitrarily. And can be customized for users to expand functions, such as network control, acoustic sensing, human proximity sensing, user software encryption protection, infrared data transmission, etc. IQTouch K interactive touch screen feature 20-point touch and dual system -- Android 8.0 system and optional OPS Windows 10Pro system. Its 4K UHD resolution facilitates presentations and collaboration. With optional multi-screen casting software, IQClass 6.0 and installation-free IQClass Plus software, IQTouch K Series can help create an interactive and collaborative teaching atmosphere in class.