The hottest touch panel module technology OGS vs.

2022-09-26
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The latest report made by display search, a market research organization, on touch panel technology, points out that at present, the two main structures of touch sensor are glass capacitor and film capacitor. The most representative brand of glass capacitor is apple, and the leader of film capacitor is Samsung. It is precisely because of the different structural choices of sensing devices among brands that there are different touch module supply chains behind them. Therefore, for many observers of the touch industry, guessing the final competitive results of these two camps is a hot topic

from the era of PDA in the past to the early touch, resistive technology once led the trend. When the leading iPhone officially brought projection capacitors into intelligent applications in 2007, in less than five years, projection capacitors will replace resistive and become the touch technology with the largest shipment. Xiezhongli, a senior analyst at DisplaySearch, said that the future development will be more dramatic than that of glass and film, and it will be clearer in the next 1-2 years. The existing plug-in touch modules, whether glass or thin film, must be laid out in the sensor on cover or one glass solution, and the competition between glass or thin film will also be transformed into the competition between single glass touch and in-cell touch

at present, most of the existing projection capacitors are plug-in, "plug-in" refers to carrying the sensorpattern with a sensorsubstrate independent of the panel; This substrate will be further bonded with the panel. The substrate selection of touch sensing circuit is usually either glass or film (PET). The advantage of glass is that it can withstand high process temperature and high resistance. Therefore, when splashing ITO touch sensing layer, it often has a better impedance value. In contrast, the impedance value of thin films is generally not as ideal as that of glass; However, the film has obvious advantages in thickness and weight

due to the need for bonding between stacked layers, the final cost of the touch module is closely related to the yield of bonding, especially the way of full bonding, in addition to the material cost. Therefore, if we can improve the yield of fitting, or even reduce the number of fitting, it will become the development direction of touch process technology. At present, there are two new technologies in the touch industry, and the purpose of these two technologies is to eliminate the use of the sensing circuit substrate; One is the monolithic glass touch (OGS) scheme, and the other is the final scheme of panel embedded touch (incell)

display search pointed out that the single-chip glass touch and panel embedded touch schemes can reduce the times of fitting, save material costs, and reduce the weight of the application device, which is important for tablet computers; This is why since the third quarter of this year, the system factory has received a large proportion of the request for quotation (RFQ) from the brand, hoping to introduce a monolithic glass touch scheme to the new model in 2012. In addition to the different impact and integration on the value chain, these two technologies will not be a zero sum competition in the foreseeable future; The reason is that these two technologies have their advantages and disadvantages, and it is not necessarily only from the technical perspective

in terms of the matching of surface glass, the single-chip glass touch scheme is not easy to match with surface glass in 2.5D or 3D forms, especially when the so-called "sheet type" is selected, it is not easy to carry out overly complex surface glass processing. For the panel embedded touch control scheme, because the sensing line has nothing to do with the surface glass, in principle, the design and collocation of the surface glass will be relatively free, just as the appearance of adulterated tubes has made consumers firm in their search for hanging schemes for healthy and environmentally friendly plastic pipe products

from the perspective of the yield cost of the sensing line, the panel embedded touch scheme is obviously higher. Display search said that once defective products appear in the sensor patterning process of the monolithic glass touch scheme, the loss is only the surface glass, but the panel embedded touch scheme is to scrap the whole panel. However, from the perspective of the subsequent module manufacturing process, the panel embedded touch control scheme is obviously easier, because it only needs to adhere to the surface glass, and the touch control chip, copper foil flexible ribbon cable and the panel have been integrated. The single-chip glass touch control scheme does not need to sense the circuit substrate, but the touch control chip, copper foil flexible cable and panel bonding are still necessary. Compared with the plug-in touch control scheme, these two new structures only need to be fitted once

intuitively, the panel embedded touch control scheme should be more dominant if the yield and quotation of the panel factory are quite competitive. Although the trend of simplifying and integrating the structure of touch sensing devices has been obvious, in fact, after the addition of complex factors from brand considerations, these two technologies have their own advantages. Due to the customization needs of small and medium-sized applications, such as electronic platform specifications, mechanism design, additional functions, panels, etc., there are specific needs from brands, and the life cycle of this kind of consumer electronic products is too short, which will also make the parties who require and receive customization have more business, rather than technical considerations

with the single-chip glass touch scheme, the brand will have complete control over the touch control chip. It can not only choose the appropriate touch control chip to match and optimize the operating system platform of the terminal; It can also fine tune the touch efficiency according to different terminal mechanism designs, and it is also relatively free to choose the suppliers of touch control chips and panels, so it is not easy to have a single source

if the panel embedded touch scheme is selected, the components often bundled together include important panels and touch control chips, and may even include panel drive chips. Therefore, from the perspective of brand procurement, the risk of a single supplier is high. From the perspective of panel factories that provide panel embedded touch control solutions, unless the brand can promise a certain shipment, the panel factory may not be willing to customize, and most of them will hope that the brand can directly adopt the whole set of solutions proposed by the panel factory. However, the touch control chip selected by the panel factory may not be accepted and certified by the brand

display search said that for front-line touch control chip suppliers, they may not be willing to cooperate with panel manufacturers without brand support and endorsement; Moreover, in order to support their own supply chain, panel factories may choose these front-line touch control chip suppliers at the beginning, but in the end, they may tend to adopt the touch control chip solutions of relevant enterprises, especially from the relevant drive chip suppliers of panel factories

based on the above analysis, display should make the impact testing machine run away from places with high humidity. Search believes that the competition between single-chip glass and panel embedded touch solutions will never be a zero sum competition in the foreseeable future, just like glass and thin film capacitors; Moreover, the brand will have a certain leading force, not the panel factory

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