Developments of Reverse Offset Printing and Its Specialized Functional Inks for Flexible Thin Film Transistors

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  • PE（印刷TFT）への反転オフセット印刷法の適用と機能性インク
  • PE(インサツ TFT)ヘ ノ ハンテン オフセット インサツホウ ノ テキヨウ ト キノウセイ インク

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<p>Several printing techniques for fabricating organic thin film transistor arrays have been studied. However, such conventional printing techniques like flexo, screen, and ink jet printing show poor printing resolutions of only 20 mm or higher, which is not sufficient for high-resolution thin film transistors (TFTs). Reverse offset printing has attracted much attention recently because of its ability to make fine patterns of less than 5 mm with smooth surfaces. Functional inks for printed TFTs by reverse offset printing have been developed. A polymer network liquid crystal display has driven by the backplane fabricated by reverse offset printing using these functional inks. From the perspective of enabling the industrialized production of printed flexible TFTs, the key points for printing technology include a technique for fabricating fine patterns, a method for realizing precise overlays and the construction of simple and low-cost production processes. Misregistration of the overlying patterns can be caused by the thermal annealing of the plastic films that are needed to convert the ink film layers to functional film layers. In order to overcome this problem, new printing process called as a wet on wet process by reverse offset printing is proposed. The wet-on-wet process by reverse offset printing is that subsequent layers can be printed on previous semi-dried layers, after which all the layers are sintered simultaneously. This can realize not only precise pattern overlays on a flexible plastic substrate but also significantly simplify the printing process.</p>

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