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  Organic thin-film transistor manufacturing method, organic thin-film transistor, and organic thin-film transistor sheetUSPTO Application #: 20070221918Title: Organic thin-film transistor manufacturing method, organic thin-film transistor, and organic thin-film transistor sheet Abstract: An organic thin-film transistor is disclosed. The transistor may include a substrate, a gate electrode, a gate insulating layer, an organic semiconductor layer protective layer, a source electrode, and a drain electrode, wherein a layer formed on the organic semiconductor layer may have a light transmittance of not more than 10%. (end of abstract) Agent: Cantor Colburn, LLP - Bloomfield, CT, US Inventor: Katsura Hirai USPTO Applicaton #: 20070221918 - Class: 257040000 (USPTO) Related Patent Categories: Active Solid-state Devices (e.g., Transistors, Solid-state Diodes), Organic Semiconductor Material The Patent Description & Claims data below is from USPTO Patent Application 20070221918. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] The present application is a continuation application under 35 U.S.C. .sctn.120 of U.S. patent application Ser. No. 11/074,287 filed on Mar. 7, 2005, the entire contents of which are incorporated herein by reference. The 11/074,287 application is a divisional application under 35 U.S.C. .sctn.120 of U.S. patent application Ser. No. 10/742,194 filed on Dec. 19, 2003, the entire contents of which are incorporated herein by reference. The 10/742,194 application claimed the benefit of the date of the earlier filed Japanese Patent Application No. JP 2002-376793 filed Dec. 26, 2002. Priority to all of the above applications is claimed herein also. FIELD OF THE INVENTION [0002] The present invention relates to an organic thin-film transistor manufacturing method, an organic thin-film transistor manufactured by the method, an organic thin-film transistor, and an organic thin-film transistor sheet. BACKGROUND OF THE INVENTION [0003] With the spread of information terminals, there are increasing demands for a flat panel display that serves as a display for a computer. Further, with development of the information technology, there has been increased a chance for information offered in a form of a sheet of paper medium in the past to be offered in an electronic form. An electronic paper or a digital paper is demanded increasingly as a display medium for a mobile that is thin, lightweight and handy. [0004] In the case of a display device of a flat sheet type, a display medium is generally formed using an element that employs a liquid crystal, organic EL or electrophoresis method. In the display medium of this kind, a technology for using an active driving element comprised of a thin-film transistor (TFT), serving as an image driving element, is the main current for ensuring uniform image brightness and an image rewriting speed. [0005] The TFT is manufactured by a process comprising forming, on a glass substrate, a semiconductor layer of a-Si (amorphous silicone) or p-Si (poly-silicone) and metal films of source, drain and gate electrodes, in the order. In the manufacture of a flat panel display employing such a TFT, a photolithography step with high precision is required in addition to a thin layer forming step requiring a vacuum line carrying out a CVD method or a sputtering method or a high temperature treatment step, which results in great increase of manufacturing cost or running cost. Recent demand for a large-sized display panel further increases those costs described above. [0006] In order to overcome the above-described defects, an organic thin-film transistor employing an organic semiconducting material has been extensively studied (refer to Japanese Patent O.P.I. Publication No. 10-19000 and "Advanced Material", 2002, No. 2, p. 99 (review)). Since the organic thin-film transistor can be manufactured at low temperature employing a lightweight substrate difficult to be broken, a flexible display employing a resin film as a substrate can be realized (refer to SID '02 Digest P. 57). Further, employing an organic semiconducting material allowing a wet process such as a printing method or a coating method, a display manufacturing process can be realized which provides excellent productivity and reduced cost. [0007] However, an organic thin-film transistor, when allowed to stand in air, deteriorates, resulting in lowering of transistor properties. Further, an organic thin-film transistor, when manufactured by a process comprising forming an organic semiconductor layer, followed by coating of a light sensitive resin layer, and development of the light sensitive resin layer air, results in deterioration of transistor properties due to a solvent used for coating or components contained in a developer used for development. [0008] An organic thin-film transistor employing a substrate such as a resin plate or a resin film is easily folded as compared with that employing a glass plate. Therefore, the former has problem in that properties as a transistor deteriorate due to folding, or due to light. SUMMARY OF THE INVENTION [0009] The present invention has been made in view of the above. An object of the invention is to provide an organic thin-film transistor manufacturing method minimizing deterioration during the manufacture of transistor properties and minimizing deterioration with time or due to folding of the transistor properties, and an organic thin-film transistor manufactured by the method. Another object of the invention is to provide an organic thin-film transistor and an organic thin-film transistor sheet, each minimizing deterioration with time or due to folding of the transistor properties. BRIEF DESCRIPTION OF THE DRAWINGS Brief Explanation of the Drawings [0010] FIG. 1 is a structural example of the organic thin-film transistor of the invention (top gate type). [0011] FIG. 2 is a structural example of the organic thin-film transistor of the invention (bottom gate type). [0012] FIG. 3 is a schematic equivalent circuit diagram of one example of the organic thin-film transistor sheet of the invention. [0013] FIGS. 4(1) through 4(8) are illustrations for explaining one embodiment of the organic thin-film transistor manufacturing method of the invention. [0014] FIG. 5 is an illustration showing one structural example of a comparative organic thin-film transistor. [0015] FIG. 6 is an illustration showing another structural example of a comparative organic thin-film transistor. [0016] FIG. 7 is an illustration showing one structural example of an inventive organic thin-film transistor. [0017] FIG. 8 is an illustration showing another structural example of an inventive organic thin-film transistor. [0018] FIGS. 9(1) through 9(3) are illustrations for explaining another embodiment of the organic thin-film transistor manufacturing method of the invention. Continue reading... Full patent description for Organic thin-film transistor manufacturing method, organic thin-film transistor, and organic thin-film transistor sheet Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Organic thin-film transistor manufacturing method, organic thin-film transistor, and organic thin-film transistor sheet patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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