Touch panel OGS hegemony yield is the decisive point

The touch panel plant this year two technical focus, respectively, monolithic glass solution (OGS) and glass film capacitor (GF), two technical characteristics, but also can be extended to medium and large size touch panel, therefore, much market attention. Among them, OGS stressed that the monolithic glass process, the whole process from the front to the rear section of the joint chemical enhanced, due to the procedures, yield losses are high, the yield did not reach a balance at the same time, part of the touch panel plant will also face the fear of profit crisis.

The so-called monolithic glass solution is coated glass (ITO) and the protective glass into a piece of glass, the touch sensors fabricated directly on the protective glass, so that not only can reduce the cost of the touch panel module, can also reduce the thickness of the touch control module, which is lighter and thinner.

However, the relative strength of the glass is relatively fragile, naturally also need to strengthen the chemical process to enhance the overall hardness. Therefore, compared to the past era of double glass capacitors, monolithic glass processes are required more and more, on average, each single glass solution process is more than 10.

However, many processes, but also means that the yield loss will be greater than in the past. In the past, the key lies in the double glass fit, as long as the fit process yield is high, the overall yield can be maintained at above loss level point however, monolithic glass now solution should not only consider the preceding chemical strengthening process yield, but also consider the BEOL yield hurdle down, yield loss constant.

At present, the domestic import monolithic glass industry solutions including F-TPK Chen Hung (3673), (2384), Shenghua Hong (8056), among them, with the fastest Shenghua OGS shipments, since 2012, there are many manufacturers using monolithic glass plate scheme Shenghua, and Chen Hung, hung up to also catch up, won the favor of the market, only worrying, or yield problems.

The market has to consider the possibility of using in-cELl (embedded) process to replace, but now it seems that the in-cell yield is poor, and the in-cell technology can not be extended to large size, therefore, monolithic glass will be the future in large size touch panel the most important solution, touch panel factory rushing into the OGS market the strategy is right, then, can enhance the yield, the key is how much profit.