Projective and capacitor the touch screen for the built-in mobile systems
In work types of the touch screens used in modern devices of mobile communication and for the other mobile built-in systems are considered. Object of research is touch capacitor the screen. An essence of work is creation of the projective and capacitor touch screen with higher characteristics (light transmissivity to 92% instead of 75–85%, response time to 4 ms, the speed of work of ATsP of 125 kHz, thickness of the touch panel to 2 mm), than the resistive and other capacitor screens used in the market of mobile devices. At the same time the cost of production of such screen has to be comparable with resistive, but characteristics of the received product are similar to properties of other projective and capacitor touch panels. For the solution of these tasks the projective and capacitor panel from a matrix of condensers, the thick-film production technology of the touch screen, and also a controler chip with 64 triggers for fixation of a contact, 9 shifrator of K155IV1 and 6 logical elements is used. The screen with the same market price range, as well as resistive analogs is as a result developed projective and capacitor. Its testing showed operability of the screen and compliance to the declared ranges of characteristics: supply voltage 3,7 B, speed of 4-5 ms, response to a touch of electric capacity 100–300 пФ (a body of the person) with operation of the controler of determination of coordinates of a touch at a voltage of 3,78 V.