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Advantages And Disadvantages Of Nano Silver Wire And Metal Mesh Material Technology
Aug 16, 2018

ITO, that is, indium tin oxide (Indium Tin Oxide). It is the most commonly used thin film material for transparent electrodes of liquid crystal displays (LCDs), plasma displays (PDPs), electroluminescent displays (EL/OLEDs), touch panels, solar cells, and other electronic meters. The Touch Material Show takes you to understand their characteristics.

Future mobile terminals, wearable devices, smart home appliances and other products have strong demand for touch panels. At the same time, with the large size and low cost of touch panels, and traditional ITO films cannot be used for flexible applications, conductivity and transparency. Factors such as light rate are difficult to overcome and other factors, panel manufacturers have begun to study alternatives to ITO, including nano silver wire, metal mesh, carbon nanotubes and graphene.

New material technology applications can extend from the common panel size of smartphones to devices larger than 20 inches, and their resistance, elongation and flexibility are superior to ITO films. Although the new material technology can not completely replace the ITO film in a short time, the new material technology has great advantages, and from the market reaction point of view, the proportion of film products produced by applying new material technology is increasing year by year. At present, graphene throwing is in the research and development stage, and there is still a long way to go from mass production. The industrialized mass production technology of carbon nanotubes has not been perfected, and the conductivity of the film products produced by them cannot reach the level of ordinary ITO films. Therefore, from the comprehensive evaluation of technology development and market application, metal grid and nano silver line technology will be the two protagonists of the emerging emerging touch technology.

The Metal Mesh technology utilizes a readily available and inexpensive raw material such as a metal such as silver or copper or an oxide, and presses the formed conductive metal grid pattern on a plastic film such as PET. Its theoretical minimum resistance can reach 0.1 ohms per square inch, and it has good electromagnetic interference shielding effect. However, due to the state of the art of printing, the resulting touch sensor pattern has a thicker metal line width, usually greater than 5 um, which results in very high Murray interference ripple at high pixels (usually greater than 200 ppi). . In the display screen of the Murray Interference Index code product, the pixel, the optical film and the metal pattern of the touch conductive, in the horizontal and vertical directions, the regularly aligned pixels and the fine regular pattern overlap of the object are slightly deviated, and the interference may occur. Ripple pattern. Due to the existence of Murray's interference, the film products made by metal grid technology are not suitable for high-resolution products such as high-resolution smartphones and tablets, and are only suitable for viewing screens with distant distances, such as desktop integrated machines. , laptops, smart TVs, etc.

If the line width of the metal mesh pattern in the film can be greatly reduced, the problem of Murray interference in the metal mesh technology can be effectively reduced, especially if the line width of the metal mesh pattern drops to about 1 um. The finished film can also be mounted on high-resolution smart devices. At present, South Korea's Samsung uses the fine line width and patterning technology to reduce the line width of the metal grid pattern from the original 5um~6um to about 3um. However, it is not easy to reduce the line width greatly. The traditional press printing process cannot meet the requirements. The yellow light process is required, the manufacturing cost will increase greatly, and the raw materials will be wasted; the thin metal wire width is easy to be squeezed by external force. Fracture; the resistance of the grid increases, and higher sensitivity requirements are imposed on downstream control IC chips. Therefore, at present, how to reduce the cost of metal grid technology to meet the downstream application of multiple scenarios is a difficult point, and the entire industry chain needs further development and improvement.

SNW (silvernano wire) technology is to apply nano silver wire ink material on a plastic or glass substrate, and then use laser lithography to describe a transparent conductive film with a nano-scale silver wire conductive network pattern. Due to its special physical mechanism, the diameter of the line width of the nano silver wire is very small, about 50 nm, much smaller than 1 um, so there is no problem of Murray interference, and it can be applied to display screens of various sizes. In addition, due to the small line width, the conductive film made by the silver wire technology can achieve higher transmittance than the film made by the metal mesh technology. For example, the film product made by the micro-printing method can be achieved by 3M Company. 89% light transmittance. Thirdly, the nano silver wire film has a smaller bending radius than the metal mesh film, and the resistance change rate is small when bending, and is applied to a device having a curved display, such as a smart watch, a wristband, etc. Advantages.

On the film, the metal wire in the metal mesh can reflect the total area of the visible light; the nano silver wire is not a grid but an irregular distribution, which is covered with the entire surface of the glass substrate. In comparison, nano-silver films have more severe diffuse reflections, both haze problems. The haze problem of the screen can cause the screen to reflect light in the case of outdoor scene lighting, which can make the user unable to see the screen in severe cases. However, some technical means can be used to reduce light diffusion and solve the haze problem. For example, Nissan Chemical Co., Ltd. has developed a high refractive index material coated on a nanosilver film to reduce haze, effectively reducing the haze value. In addition, techniques such as blackening the surface of the nanosilver line, reducing the light reflection intensity, and roughening the surface of the nano silver wire can also effectively improve the haze problem.

Metal mesh technology uses traditional silver, copper and other metal materials or oxides as raw materials to produce thin film panels by traditional printing methods. The raw materials and production costs are very low, but such products are insurmountable. Swiss interference problems, applications are limited. If you want to reduce the line width of the metal in the metal grid, you need to change the manufacturing process, the cost will increase, and there will be problems such as fragile lines. Compared with metal grid technology, nano-silver wire technology uses shaped nano-silver ink materials. These nano-silver wire supply materials are in the hands of a few companies such as Cambrios Technologies. The cost of raw materials is higher, but the manufacturing process is simple. The printing process is used to quickly produce large-area touch panels, and the overall cost is not high. With large-scale production, the cost will be further reduced.

Therefore, the comprehensive comparison, nano silver wire technology has more advantages than metal grid technology. As far as the current market is concerned, it has also split into two major technology camps. Among the nano silver line camps, Taiwan panel supplier TPK is the main manufacturer of nano silver wire technology, and combined with upstream nano silver wire material supplier Cambrios Technologies, and production technology company Japan photo to set up a subsidiary to focus on expansion. Development, application and manufacturing of nano silver wire technology. TPK expects to achieve mass production shipments of nano silver wire films in the second quarter of 2014.

The metal grid technology camp has joined more companies, such as Su Daweige and Ou Feiguang, and South Korea's Samsung are involved in research and development and manufacturing. However, compared with the metal grid camp, the companies in the nano-silver line camp are also leading enterprises in the company, with strong professional expertise and close integration of the upstream, downstream and downstream industries.

In addition, according to media reports, Apple's iWatch, which attracts everyone's attention, will use TPK's nano-silver film technology to prove that nano-silver products do have obvious technical advantages and stability of the industrial chain.

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