Surface capacitive screen and projected capacitive screen, you know how much, there are specific on how specific

Projected capacitive screen is the use of projected capacitive touch technology screen, touch screen panel can be detected when the finger touches the position of the capacitive change so as to calculate the finger is located, multi-touch operation. The common applications of projected capacitive screen in daily life are cell phone, mp4, digital camera and so on. (1) The surface glass and double-sided ITO glass are both reinforced glass, of which the surface layer is a non-conductive glass.　(2) The optically clear adhesive between the surface glass and the double-sided ITO glass is what we usually call OCA adhesive. Scanning Methods of Projected Capacitive Screens Projected capacitive solutions are generally categorized into self-capacitance and mutual capacitance according to their scanning methods: the so-called self-capacitance usually refers to the capacitance between the scanning electrode and the ground. In the glass surface is useful ITO (a transparent conductive material) made of horizontal and vertical scanning electrodes, these electrodes and the ground between the two poles constitute a capacitance. When touched with a hand or a stylus a capacitance is connected in parallel to the circuit, thus changing the overall capacitance on the scan line. During scanning, the control IC scans the longitudinal and lateral electrodes in sequence and determines the coordinate position of the touch point based on the change in capacitance before and after the scan. The advantage of self-capacitance scanning is that the scanning speed is fast, and only X+Y (X and Y are the number of scanning electrodes in the X and Y axes, respectively) roots need to be scanned after one scanning cycle. The disadvantage is that it can not recognize the ghost point, can not do a real Real Touch. projected capacitive screen development difficulties 1, chip technology: the current mainstream is the CYPRESS program single-sided prismatic structure of the PATTERN electrode.　　2, touch panel technology: the need for multiple coating, photolithography and etching, the process is quite complex, and difficult to improve the yield, there are many process details need to be tackled and optimization.　　3, the development cycle: the same chip, different touch electrode design will affect the final touch effect, sensitivity, accuracy, anti-interference and so on. Therefore, the need for continuous optimization and selection of materials, such as the choice of ITO cube resistance, line width and line spacing design, control of loop resistance, etc., the development cycle is quite long 4, high development costs: due to the need for repeated debugging for the selection of the best parameters, the process is not only long, and the cost will be very high, the conventional design, photomasks have to be three, according to the calculation of 15,000 each, such as a slight design change will have to re-design the photomask. If there is a slight change in the design, the photomask will have to be redesigned. Carving glue, shadow liquid, washing liquid, glass substrate, light display clear glass SPUTTER are very expensive, the power cost is also quite high.　　5, talent is difficult to find: projected capacitive screen involves chip technology and touch panel technology, know the chip does not understand the touch panel process, the design can not objectively take into account the impact of the process, the whole theory of the design is not feasible. Those who know the process don't know the chip technology, and they can't predict how the variation in the process will affect the driver, and the potential failure will cause unstable performance, but they can't understand where it occurs. Therefore, it is necessary to establish a complete team, chip technology, panel pre-processing technology, post-processing lamination of each section of the relevant technical team in order to speed up the entire development process, the lack of one, unless it is a generalist. Projected capacitive screen applications Projected capacitive screens are widely used in various areas of our daily lives, such as cell phones, media players, navigation systems, digital cameras, digital cameras, digital photo frames, PDAs, gaming devices, monitors, appliance controls, medical equipment and so on.