The touch screen pursues light and thin, and the original display external touch module has recently been replaced by in-cell in-line, and the touch element electrodes are integrated on the drive circuit substrate of the display element to reduce the stack of glass or film. To realize the slimness of the display module, such a process requires a manufacturer with extremely high yellow lithography capability and advanced equipment to integrate a very small line width line and produce a reasonable yield product, so the supply of in-cell has been available so far. Manufacturers are still limited to a few LTPS panel factories, and the production process is complicated, the yield is not easy to improve, the interference is easy, and the size is not easy to be difficult.
Xu Ming, general manager of Hengyi Electronic Materials, said that with the development of current In-cell technology, it will become insensitive to large and medium-sized touch, and the future 2k resolution or 4x pixel high-quality display will make the line It is difficult to design and manufacture, and it is difficult to make three major bottlenecks such as curved touch.
Metal grid external touch will be the solution trend to overcome the above in-cell problem. Xu Ming said that because copper is a very good conductive material, the resistance value is less than 1/100 of ITO, it is very easy to make large and high. Sensitive touch modules have no special requirements for the driver IC. At the same time, the metal mesh metalmesh process can simultaneously produce very thin (3um) sensing area and line area circuit, eliminating the need for multiple processes and silver paste materials, so that the production cost of the touch module is greatly reduced.
Hengyi Electronic Materials integrates semiconductor process technology and photoresist technology to develop a complete material solution for fine copper process, breaking through the bottleneck of copper metal grid Cumetalmesh copper process technology, without expensive exposure equipment, and the minimum copper wire width can also be achieved. ~2um, the exhibition has achieved initial results this year. At present, many manufacturers have introduced Cu-ITO narrow-neck film touch for copper collection line less than 20um, and copper metal grid Cumetalmesh glass with pure copper line width less than 2um. Produced with a thin film touch sensor.
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