Anti-glare Interfere With High-precision Infrared Touch Screen Design And Implementation,

Touchscreen display is an absolute positioning system.As a simple and convenient input device it has been increasingly wider range of applications.As one of the fashionable touch-screen technologies, Infrared touch-screen has become the subject of concern because of its high transmission rate and accurate positioning without drift.But traditional touch-screen resolution of a few dozen has been unable to meet application needs along with the continuous development of display technology and popularity of large-screen display.In addition,infrared touch-screen used infrared receiver tube as sensors,and when the environment sunlight intensity is high,the normal work of the infrared receiver will been intervened.These deficiencies cause great impact on the application of infrared touch-screen.Nowdays , infrared touch-screen technology has developed rapidly.Although commercial infrared touch-screen resolution has been achieved 1000×720 in domestic, 4096×4096 in a foreign country, the performance of anti-glare interference is not satisfactory.The infrared touch-screen can not be achieved normal positioning in domestic for large-screen with length about 610mm. In view of such circumstances, An anti-glare interference with the high-resolution infrared touch-screen design and implementation of the programme were proposed. A broad variety of touch-screen features, positioning principle and the properties of touch-screen comparison were introduced in this dissertation, which focused on the structure of infrared touch screen, positioning principle, advantages and disadvantages as well as the trend of development. Based on the progress in the areas of touch-screen, The AD converter was used innovatively to quantify the voltage signal of reflected light intensity change output by infrared receiver circuit, and the accurate data changes output from AD converter could meet to requirement of high-resolution. Infrared transmitter lighting and flexible scanning was drived by means of the control of shift-register and the storage-register. The collimator-channel sensitive to the propagation direction enhance anti-glare interference capability of infrared touch-screen.In the process of realize high-resolution and anti-glare interference performance, firstly, the feasibility of entire design theory was established,and then its effectiveness was proved by experiment,at last, the final system was tested to verify whether it actually achieve the desired goals.The built-in infrared touch-screen has been installed in the multi-function display with seamless stitching, the resolution of 2048×768. in the area of anti-glare interference, normal environment does not affect application, in addition, position accurately and stably without drift was required as well fast response and so on. Allow for restriction of size, simple circuit structure and I2C bus was used to reduce size dimention, and the touch screen bezel width was reduced to 15 mm without affected the performance of touch screen. The infrared touch screen has been applied to multifunction display in some kind of instrument; the usage of a year has proved the precision and reliability of infrared touch-screen.