Research Of Anti Glare And High Precision Infrared Multi-touch Screen

As a kind of convenient, intuitive, quick way of human-computer interaction, touch technology is widely used. With the development of science and technology, there is a clear market demand for touch products in the aerospace field. With the increase in the size of the touch-screen, infrared touch-screen has an advantage in the field of space.There are 3 different points between the common touch-screen and the infrared touch-screen used in the aerospace field. Firstly, when the special touch-screen works in the sunlight environment,the problem of light interference needs to be solved. Secondly, in the case of solving the problem of light interference which limits the lamp layout, and then the precision of the touch-screen is improved as high as possible. Finally, under the condition of two points touch mode, the oblique scanning light is relatively sparse near the display edge, and the oblique scan exclusion method cannot be used to distinguish the true and false points, which leads to the high rate of false position.In view of the above special situation, the corresponding improvement design is adopted.Redundant backup of the two positioning system is used to solve the problem that infrared touch-screen cannot be used under strong light. When the side exposed to light is failure, the other side is used to carry out work. In the single point touch mode, the touch control system is based on the multi line tilt scanning method, and the extended axis coordinate is established. Based on the idea of probability statistics, the sample data are statistically averaged, and the final touch coordinates are obtained. This method not only can improve the positioning accuracy, but also has little effect on the accuracy when the individual infrared emission tube is invalid. Finally, in the case of insufficient memory resources and limited computing capacity, the class center algorithm and distance algorithm are used to accurately calculate two touch points, and effectively avoid failures near 4 edges.Based on the above technology and innovation, a multi-touch screen applied to the 9〞×24〞is built and the function of the system is tested. Test results show that the system can accurately identify multi-touch coordinates and achieve the expected design goals.