I am often amazed by the development of the touch screen market in the past few years. Three years ago, I was fortunate to be the head of the Applied Materials Co., Ltd. roll-to-roll coating (roll-to-roll vacuum coating equipment) business unit. At that time, we spent a lot of energy on flexible electronic products, looking for opportunities for various application products, such as flexible solar panels, displays, printed circuit boards, and several applications based on transparent conductive films, including touch screen devices. Ironically, although our team has been dedicated to this market for many years, and has been selling roll-to-roll indium tin oxide (ITO) sputter coating equipment since the early 1980s, due to the market for resistive touch technology The growth space is limited, the scale is relatively small and has been tepid.
It was not until the multi-touch technology was applied to products such as mobile phones and tablet computers that the touch screen market slowly changed and stabilized. The application of projected capacitive touch technology, because of its excellent multi-touch performance, has set off a new wave of manufacturing capacity increase. At first, manufacturers with color film production lines in the industry switched product lines and used existing equipment to produce touch screen products. Later, we can apply SmartWeb roll-to-roll coating equipment for flexible substrate resistive touch screens and projected capacitive touch screens. The market demand has increased dramatically, and in the past two years, the performance of our NewAristo and AKT Aristo Twin coating equipment tailored for the production of touch screen devices has hit a record high, showing the strong growth of the market for demand for thin-film substrates and glass substrate-based touch screen products. .
In 2010, I started as the general manager of the PVD product division of the Applied Materials Display Group, and continued to work in the field of touch technology, but also adopted another method, that is, glass substrate-based touch screen technology. From the perspective of the application of touch technology, the processes of the two devices are similar, and the mechanical design of the two devices is very different. The similarity is that both use the most advanced ITO coating technology, and both use additional thin films (such as SiO2, metal, etc.) to improve the ITO characteristics. Both are suitable for the production of projected capacitive touch screens, and are eventually used in mobile phones and tablet computers. product. However, the substrate handling devices of the two types of equipment are quite different (one is single-sheet glass handling, and the other is roll-to-roll flexible substrate handling), and the optimization of the optical properties of the film and the direction of application vary. For example, the touch screen device of the flexible plastic substrate is thinner, lighter, and more impact-resistant; while the touch screen device of the glass substrate has better light transmittance and stronger scratch resistance. Of course, both methods are aggressive, constantly improving the improvement of the short board, the glass substrate becomes thinner and lighter, the flexible substrate becomes more transparent, and the surface hardness is continuously strengthened by surface coating.
Although two types of touch products, flexible substrates and glass substrates, are different, both methods jointly promote the technological innovation of the industry in the integration of multi-layer functional thin film processes. The production of projected capacitive touch screens requires the creation of graphic lines on transparent conductive films (such as ITO). Although touch screen graphics technology is relatively simpler than semiconductor or liquid crystal display graphics technology, they can be recognized by the human eye (but the use of extreme graphics technology and equipment for display quality is not necessary). In order to solve the problem of visible lines, the method of superimposing the film not only maintains the overall performance of the optical characteristics of the touch screen device but also visually hides the line pattern. Even better, the above superimposed film layer has the characteristics of an anti-reflective film, which makes the visual experience of the display device better. Another advantage of using PVD (sputtering) coating equipment is that the same equipment can be used to deposit ITO, SiO2 and / or metal film layers. For end product manufacturers, there will be an opportunity to reduce the consumption of additional materials and subsequent process steps, such as film or Wet coating process.
The future is full of possibilities. Various exciting new technologies will support the rapid development of the touch screen industry and continue to show a dynamic growth trend. I am very honored to be among the important links in the touch screen industry chain, and do my utmost to satisfy people's desire to pursue visual enjoyment and human-computer interaction.
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