What difficulties do we have in producing large-size capacitive touch panel?
Producing large-size touch panel will be much more difficult with a series of problems, such as sensor impedance, noise, cost, production process, and so on. For example, there will be a lot of problems in pasting process. If capacitive touch panel is adopting the traditional G+G structure and cover panel and sensor panel are hard glasses, it’s more possible to cause bubbles in pasting process with liquid optical adhesive and the pass rate will be affected. It is relatively simple for mobile phone and tablet computer which adopts small-size G+G structure touch panel. Meanwhile, large-size capacitive touch panel adopts G+F+F structure in which ITO glass is photoetched or printed on PET thin film and cover panel is still glass. The combination of hard glass and soft film in G+F+F structure touch panel is suitable for pasting. At the same time, the bigger the touch panel the more the number of IC chip channels is required, and the noise interference is greater.
