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Interactive touch screen ITO Nano-Ag Metal mesh
Aug 06, 2018

ITO has many limitations

At present, the transparent conductive material mainly used for small-sized touch screens (below 10 inches) is indium tin oxide (ITO). Indium tin oxide (ITO) is a semiconductor material, and the impedance of the mainstream specification of the ITO film is about 150 ohms (Ω) per unit area. This conductivity is sufficient for touch areas below 10 inches, but not for medium, large, or very large touch areas. The low conductivity of semiconductor materials can cause a decrease in touch sensitivity.

In addition, ITO belongs to cermet. When the touch area is curved or flexible, the brittleness of ITO is likely to cause a sharp increase in the impedance value and the impedance stability will become poor.

It can be seen that ITO is not suitable for medium and large touch screens and flexible touch screens. Therefore, metal grids and nano-silver lines with high conductivity and high flexibility are accelerating industrialization and have been applied to large-sized panels such as notebook computers and computers.

Nano silver wire is more suitable for large size and curved screens

Metal grids are industrialized faster than nano-silver lines.

The metal mesh is a conductive metal mesh pattern formed by pressing a plastic film such as PET by using a metal material such as silver or copper or an oxide or the like which is easy to obtain and inexpensive. Its resistance value is as low as 0.1 ohm (Ω) / square inch, and the touch effect is good. However, due to the state of the art of printing, the resulting touch sensor pattern has a thicker metal line width, and the Murray interference ripple is very noticeable at high pixels. Therefore, it is not suitable for high-resolution products, and is more suitable for viewing medium-sized display screens with distant distances, such as notebook computers and smart TVs.

The nano silver wire is coated with a nano silver wire ink material on a plastic or glass substrate, and then patterned by laser or yellow light engraving to form a transparent conductive film having a nano-scale silver wire conductive network pattern. The nano silver wire has a line width of about 20 nm and does not have a Murray interference problem, so it can be applied to displays of various sizes. In addition, the nano-silver film has a smaller bending radius than the metal mesh film, and the resistance change rate is small when bent, which is more advantageous in the application of the curved display device.

metak mesh  touch panel.jpeg

In addition, in the field of large-size and oversized touch screens, the cost of nano-silver wires is only one-fifth the cost of the same-made Japanese-made metal grid.

Cut in from the large-size interactive screen market

As mentioned above, metal grid industrialization is faster than nano silver wire and has been applied to the medium-sized touch screen market such as notebook computers. Therefore, Nofi Nano Technology will cut into the large-size and ultra-large-size touch screen market with the most obvious advantages of nano-silver lines, and gradually shake the medium-size touch screen market.

With the sustained and steady growth of the national economy and the acceleration of the social development process, the market demand for commercial large-screen displays is increasing, and large-screen display technologies and markets are gradually developing. Education, media, advertising, conferences and other industries are targeting large-screen display devices. Demand is growing. According to IHS DisplaySearch, global LCD commercial public display shipments reached 3.6 million units in 2018.

interactive touch screen.jpeg

In the long run, in addition to touch screens, nano-silver film can also be used as building dimming materials, electrode materials for thin-film solar cells, and so on. The potential market is huge.

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