Challenges for Screen-printingBeginning with mobile phones, easy-to-use mobile devices with build-in touch-screens are becoming more and more common in our daily lives. As this technology develops, the worldwide price competition between the manufacturers also becomes more aggressive.
Basic structure of touch-screen (Resistance film method)The touched point is detected by using the characteristics of resistance film that changes its electric resistance at the part being pressed. Therefore this point can be identified and located easily. 90% of all touch-screens currently sold on the market are being produced in this method where horizontal direction and vertical direction are detected individually.
Screen-printing processes for touch-screensMicro-tec screen-printing machines can be used for applying dot spacers, forming conductive patterns or insulation resistance. Especially applications with the need for Multi-input capacity of the resistive layer and the demand for detecting the touch intensity can be effectively realized with Micro-tecs high precision and fine screen printers. Complex requirements like multi-input capability or sensing the writing pressure on the resistance film demand a very fine pattern and a high-precision screen-printing technology. Micro-tec machines are capable of such high-tech requirements.
Other touch-screen methodsBeside the resistance film method, there are 4 other methods such as capacitance, ultrasonic, infrared and electromagnetic. The classic example for build-in touchscreens, the iPhone, for example adopts the projected capacitance method: a conductive pattern is applied to the film surface, which senses the electrostatic energy of an approaching or touching finger and therefore recognizes the touched point by the change in electrostatic capacity. With the ability to detect also more than two simultaneously touched points, complex operations like multitouch become possible.
Micro-tec screen printers for this application