The following describes the structure of the projected capacitive type. The formation of transparent electrodes on both sides of the glass substrate and the formation of the x-axis electrode and the F-axis electrode on the surface of the glass substrate through the insulating layer lamination technology have been described above. The projected capacitive touch screen structure uses a thin film substrate with ITO, and also uses glue materials. After patterning the ITO, it is combined with the patterned PET film substrate to form a touch screen. Use conductive glue to form wiring and connect the electrodes to the external drive circuit. In addition, the patterning of ITO can be achieved through a laser dry etching process or a wet etching process.
Projected capacitive touch screens, like resistive touch screens, require the formation of fine 1T0 electrode patterns and require photoresist with high-precision resolution. As the number of electrodes increases, wiring also becomes complicated, and it is necessary to form a thin line conductive paste of less than 100|xm by printing technology. The previous conductive adhesives could not achieve this precision, so a high-precision conductive adhesive AF4500 was developed. Use AF4500 conductive adhesive to form wiring below XVm by printing technology. 3 Bond the X axis to the F axis with an adhesive, and then connect with the FPC. There are also wiring patterns on the glass substrate through a thin film patterning process.
Take the structure of resistive touch screen as an example to explain the glue used. All processes can be completed through the previous screen printing process, which can reduce production costs. At the beginning, it was widely used in mobile terminal products centered on PDAs. In recent years, with the development of large-scale and narrow-frame display devices, a matching fine pattern conductive adhesive is required, and thus printing technology is also required to be improved. With the increase in the output of projected capacitive touch screens and the development of resistive touch screen touch recording technology, the demand for conductive adhesives is increasing.
The touch screen has also been continuously developed as a man-machine interface. The development of low-temperature curing, high-precision and low-resistance conductive adhesives is underway to meet the needs of continuously developing products. In addition, the use of conductive adhesives continues to expand. Began to be used in organic solar cell wiring and RFID tag card antennas. Conductive glue can form long wiring through low-temperature printing technology, and it will play an important role in product development.
