Lightweight and low cost are the most important goals of touch panel design. And who can win the battle for a new generation of touch panels? The biggest challenge of In-cell is that the noise problem is difficult to overcome. This is because the touch sensing layer is designed near the liquid crystal layer and the TFT array, so that the sensing layer receives more noise. In fact, the advantage of OGS has gradually become obvious, and it will be able to beat the leader in 2013.
In 2012, touch technology has been highly popularized on most mobile devices. However, is it because of this that there is no new topic in the touch industry? exactly the opposite. In fact, with the popularity of touch applications, in order to improve the differentiation of their products, relevant manufacturers must continue to accelerate to the next generation of touch technology. What is the technological competition that the touch industry is chasing now?
The key is commercialization
Remember the In-cell and On-cell panel technologies that the media has been sensational in the past two years? As the saying goes, no matter how good the technology can not be put into commercial use, everything is in vain. This principle is suitable for both Incell and On-cell technologies.
Apple used In-cell on the iPhone 5 to make In-cell the focus of global attention overnight. As for the technical term of On-cell, it seems to be broken into the cold palace, and few people mention it again. In fact, the development of a new generation of touch technology on the market has never stopped. Now it is the two major technologies of In-cell and OGS. These two touch technologies are generally recognized by the market, which can further reduce the thinness of mobile devices and improve the clarity of the screen.
Of course, there are also G / F / F film panels used on the iPad mini that attract attention, but because of its low yield, low output, and high price, the cost is high. These new-generation touch panel technologies are very likely to have their first days in 2013.
From different application fields, the structure of G / F / F thin-film panels is closest to that of traditional touch panels, which has its advantages in production, and it is easier to support touch applications for 7-10 inch mobile devices. It is expected to be available in A piece of sky was found on the tablet device. Of course, for mobile phones, reducing the number of touch panel components and further reducing their thickness is the strongest demand. This gives OGS and In-cell panels the opportunity to gain substantial growth opportunities on mobile phones. However, comparing these two technologies carefully, OGS is expected to gain greater opportunities for adoption in 2013 due to its low technical difficulty.
In-cell advantage is weakening
Liu Anguo, director of Duntai's market development technology, pointed out that the rise of In-cell technology is of course because the market's demand for thinner and lighter mobile devices never stops. Compared with the traditional layered structure of touch sensor and TFT panel, the advent of the In-cell architecture is nothing more than to provide a thinner touch panel, so that the thin and light mobile devices can be more true.
Liu Anguo said that the In-cell structure can reduce the thickness of the panel by more than 40%. This is mainly through the integration of the TFT and touch sensor structure. On the same panel, it has both display and touch functions. At the same time, it can also reduce costs. Thinning and low cost are the most important goals of touch panel design. However, many people in the industry began to question that although In-cell advertises that its structure is more streamlined, its sensing layer has not been reduced, but only moved from the surface to the TFT layer, which makes the structure thickness not much thinner. .
The TFT display panel and the touch-sensing panel of the conventional touch panel are separated, and the two are adhered through an adhesive material. However, in the new generation of In-cell technology, the sensing layer is made directly in the display panel. In addition to a detailed understanding of the touch technology, such a process must also be familiar with the structure of the TFT panel. Liu Anguo pointed out that this is The huge threshold of In-cell technology lies. It is also because the production procedures are complicated, the bottleneck of mass production is difficult to break through, and the yield is difficult to improve.
Comparing the In-cell panel with the OGS touch panel, the thickness is almost the same. Instead, the sensing layer is integrated on the TFT layer, which makes the noise interference problem more serious, the cost is more expensive, and the yield is greatly reduced. This also makes experts actually not optimistic about the popularity of In-cell panels in the short term. Li Xiangyu, general manager of Inventive Elements, pointed out that the biggest challenge of In-cell technology is that its noise problem is difficult to overcome. This is mainly because the touch sensing layer that dominates transmission and reception is designed near the liquid crystal layer and the TFT array, so that the sensing layer receives more noise. To improve the yield, noise becomes the most difficult level to overcome.
In addition, in terms of thickness, the thickness of the In-cell panel is indeed reduced compared with the traditional double-layer ITO glass structure touch panel, but it is not as thin as expected. If you compare In-cell with OGS panels, In-cell has no advantage in terms of thickness. Li Xiangyu believes that the reason why iPhone 5 did not use OGS is very likely to be a problem of glass strength. However, since the advantages of In-cell are not obvious, it is worth observing whether OGS will take over the high-end touch market in the next stage.
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