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touch screen table interactive display
Apr 18, 2018

ITO, that is, tin indium oxide (Indium Tin Oxide). It is the most commonly used thin film material for transparent electrodes for liquid crystal displays (LCDs), plasma displays (PDPs), electroluminescent displays (EL/OLEDs), touch panels (Touch panels), solar cells, and other electronic instruments. ( s* p/ j$ b' t3 X+ D


    Future mobile terminals, wearable devices, smart home appliances and other products have a strong demand for touch panels. Along with the large size and low cost of touch panels, traditional ITO films cannot be used for flexible applications. Conductivity and transparency Factors such as the optical rate and other intrinsic problems are not easily overcome, and panel manufacturers have begun to study alternatives to ITO, including nanosilver, metal grids, carbon nanotubes, and graphene.


     The new material technology application can extend from the common panel size of smart phones all the way to 20-inch or more devices, and its resistance, extensibility, and bendability are better than ITO film. Although new material technologies cannot fully replace ITO films in a short period of time, new material technologies have great advantages. From the perspective of market reaction, the proportion of film products produced using new material technologies is increasing year by year. At present, graphene is being thrown into the R&D stage and there is still a long way from mass production. The industrialized mass production technology of carbon nanotubes has not been perfected, and the conductivity of the manufactured thin film products cannot reach the level of ordinary ITO films. Therefore, from the comprehensive evaluation of technology development and market application, metal grid and nano silver wire technology will be the two leading protagonists of the newly emerging touch technology. / p& W7 a* V& q6 }6 Q

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     The Metal Mesh technology utilizes readily available and inexpensive raw materials such as silver, copper or other metal materials or oxides to press a formed conductive metal grid pattern on a plastic film such as PET. The theoretical minimum resistance can reach 0.1 ohm/square inch, and there is a good electromagnetic interference shielding effect. However, due to the process level of printing production, the width of the metal lines of the touch sensor patterns obtained is larger, usually larger than 5 um, which will lead to a very clear Moire interference ripple at high pixels (usually greater than 200ppi). . Murray interference index code product display pixels, optical film and touch conductive metal patterns, in the horizontal and vertical direction, the regular alignment of the pixels and the object of the fine regular pattern overlap slightly offset, there will be interference Ripple pattern. Due to the presence of Murray intervention, thin-film products made from metal grid technology are not suitable for high-resolution smart phones, tablet computers and other high-resolution products, and are only suitable for viewing distant display screens, such as desktop integrated machines. , laptops, smart TVs, etc. 6 Z' z$ E, O5 h2 D9 o( `" )

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      If the line width of the metal grid pattern in the thin film can be greatly reduced, the problem of Murray interference in the metal grid technology can be effectively reduced, especially if the line width of the metal grid pattern is reduced to about 1 um. The resulting film can also be mounted on high-resolution smart devices. At present, South Korea's Samsung Company uses micro-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 drastically. The conventional press printing process cannot meet the requirements. The yellow light process is needed, the production cost will be greatly increased, and raw materials will be wasted; the fine metal wire width will be easily squeezed by the external force. Fracture; the resistance of the grid is increased, and higher sensitivity requirements are imposed on the downstream control IC chip. Therefore, how to reduce the cost of metal grid technology at the same time, to meet the downstream applications of multiple scenarios is a difficult point, but also need to further develop and improve the entire industry chain Caixing.


    SNW (silvernano wire) technology applies nano-silver ink materials on plastic or glass substrates, and then uses laser lithography to characterize transparent conductive films with nano-level silver wire conductive network patterns. Because of its special physical mechanism, the diameter 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 various sizes of display screens. In addition, due to the smaller line width, conductive films made of silver wire technology can achieve higher light transmittance than films made of metal mesh technology. For example, 3M's thin-film products made by micro-imprinting can achieve higher light transmittance. 89% transmittance. Once again, the nanosilver film has a smaller bending radius than the metal mesh film, and has a smaller resistance change rate when it is bent. When applied to a device with a curved display, such as a smart watch, a wristband, etc. Advantages.


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