Japan Broadcasting Corporation NHK

Setagaya ku, Japan

Japan Broadcasting Corporation NHK

Setagaya ku, Japan
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Fujisaki Y.,Japan Broadcasting Corporation NHK | Koga H.,Osaka University | Nakajima Y.,Japan Broadcasting Corporation NHK | Nakata M.,Japan Broadcasting Corporation NHK | And 5 more authors.
Advanced Functional Materials | Year: 2014

Eco-friendly and low-cost cellulose nanofiber paper (nanopaper) is a promising candidate as a novel substrate for flexible electron device applications. Here, a thin transparent nanopaper-based high-mobility organic thin-film transistor (OTFT) array is demonstrated for the first time. Nanopaper made from only native wood cellulose nanofibers has excellent thermal stability (>180°C) and chemical durability, and a low coefficient of thermal expansion (CTE: 5-10 ppm K-1). These features make it possible to build an OTFT array on nanopaper using a similar process to that for an array on conventional glass. A short-channel bottom-contact OTFT is successfully fabricated on the nanopaper by a lithographic and solution-based process. Owing to the smoothness of the cast-coated nanopaper surface, a solution processed organic semiconductor film on the nanopaper comprises large crystalline domains with a size of approximately 50-100 μm, and the corresponding TFT exhibits a high hole mobility of up to 1 cm2V-1 s-1 and a small hysteresis of below 0.1 V under ambient conditions. The nanopaper-based OTFT also had excellent flexibility and can be formed into an arbitrary shape. These combined technologies of low-cost and eco-friendly paper substrates and solution-based organic TFTs are promising for use in future flexible electronics application such as flexible displays and sensors. Optically transparent paper is an attractive candidate for the substrate of eco-friendly and low-cost flexible electron devices. Here, a high-mobility organic thin-film transistor (TFT) array is demonstrated on a 20-μm-thick transparent cellulose nanofibers paper. The fabricated short channel TFTs exhibit a high mobility of up to 1 cm2V-1s-1 and air stability. The nanopaper-based structure also has mechanical flexibility. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Fukagawa H.,Japan Broadcasting Corporation NHK | Shimizu T.,Japan Broadcasting Corporation NHK | Hanashima H.,Tokyo University of Science | Osada Y.,Tokyo University of Science | And 2 more authors.
Advanced Materials | Year: 2012

Highly efficient and stable, red phosphorescent organic light-emitting diodes (OLEDs) are demonstrated using platinum complexes. The host/dopant combination is a crucial factor in obtaining high efficiency and stability. The OLEDs exhibit a maximum external quantum efficiency of about 20% and an expected half-life of about 10 000 h with an initial luminance of 1000 cd m -2. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ito T.,Japan Broadcasting Corporation NHK
2010 IEEE Asian Solid-State Circuits Conference, A-SSCC 2010 | Year: 2010

NHK is conducting research on two future television themes: Super Hi-Vision and Integral 3DTV. In the talk, these two television systems will be introduced and their impacts on the semiconductor industry will be discussed. We consider Super Hi-Vision as the ultimate 2-dimensional television system. It is designed to be viewed with 100 degrees of visual angle to provide viewers with a sensation of reality and immersion as if they were present at the site of the video scene. This super-realistic television system requires sixteen times more resolution than the current Hi-Vision system. In the talk, the specifications of Super Hi-Vision are explained and a roadmap toward the introduction of Super Hi-Vision for the home will be shown. Research on Integral 3DTV will also be introduced as a post-Super-Hi-Vision candidate system. In the talk, the capabilities of this system and current status of research will be discussed along with expected breakthroughs. ©2010 IEEE.


Emoto M.,Japan Broadcasting Corporation NHK | Sugawara M.,Japan Broadcasting Corporation NHK
IEEE/OSA Journal of Display Technology | Year: 2012

The use of bright and wide field-of-view (FOV) displays in future TV systems will enable us to enjoy TV programs with a rich sense of presence, i.e., a sense of "being there." However, such displays can strongly stimulate human peripheral vision, which is sensitive to flicker. The recent widespread adoption of hold-type displays such as liquid crystal displays might circumvent the flicker problem in current TV systems. For temporal specification of future TV systems with bright and wide FOV displays, we measured the critical fusion frequency (CFF) in 26 participants, using varying luminance, duty ratios, and FOVs. We showed that CFF depended on the duty ratio and the FOV, and that more than 90 Hz was required to avoid flicker perception with wide FOV displays. Moreover, we demonstrated that flicker was regularly perceived in viewing wide FOV natural images presented at 60 Hz with a 50% duty ratio. © 2012 IEEE.


Fukagawa H.,Japan Broadcasting Corporation NHK
Journal of the Vacuum Society of Japan | Year: 2015

Highly efficient and stable phosphorescent organic-light emitting diodes (PHOLEDs) were demonstrated in view of optimization of emitting and/or carrier transporting materials. The device characteristics of the red PHOLED was improved by selecting a host material, which surrounds the phosphorescent dopant. The host/dopant combination was found to be a crucial factor in obtaining high efficiency and stability in the PHOLEDs. On the other hand, the novel hole-transporting materials were synthesized to improve the efficiency and operational stability of green PHOLEDs. The optimized red and green OLEDs exhibit a maximum external quantum efficiency of about 20% and an expected half lifetime of over 10,000 h with an initial luminance of 1,000 cd/m2.


Obata I.,Japan Broadcasting Corporation NHK
Digital Television Tape Recording and Other New Developments: 20th Annual SMPTE Television Conference | Year: 2016

Japan Broadcasting Corporation (NHK) has fourty local stations. In the local stations, many programs, such as infomation, sports, amusement etc., are made with VTRs. © 1986 Society of Motion Picture and Television Engineers, Inc.


Yamashita T.,Japan Broadcasting Corporation NHK | Mitani K.,Japan Broadcasting Corporation NHK
Proceedings of the IEEE | Year: 2013

Research and development of ultrahigh-definition imaging systems that go beyond high-definition television (HDTV) have converged in the field of '4K' and '8K' imaging systems. The 4K imaging systems are used for digital cinema, while the 8K systems have been developed for use in next-generation TV broadcasting systems. The latter at 60 frames/s represents the highest pixel count and frame rate of any system, which includes their transmission design. In this paper, we will present an overview of two '8K' camera systems. One achieves a full resolution of 8K using three 33-Mpixel image sensors. The other is a more compact and practical camera system that uses four 8-Mpixel image sensors. We will also describe the camera functions, evaluation results, and views for future developments. © 1963-2012 IEEE.


Arai J.,Japan Broadcasting Corporation NHK
14th Workshop on Information Optics, WIO 2015 | Year: 2015

Experiments were conducted on three previously developed devices for three-dimensional (3D) television based on integral imaging. Two of the devices were image capture devices using a high resolution complementary metal oxide semiconductor image sensor and the other a camera array. Experiment results confirmed that the 3D images the devices capture had appropriate motion parallax. The third was a display device using four liquid crystal displays (LCDs) so that a large number of pixels can be displayed. Experiment results confirmed that it enables the display area of 3D images obtained with a single LCD to be quadrupled. © 2015 IEEE.


Fukagawa H.,Japan Broadcasting Corporation NHK | Shimizu T.,Japan Broadcasting Corporation NHK | Ohbe N.,Tokyo University of Science | Tokito S.,Japan Broadcasting Corporation NHK | And 2 more authors.
Organic Electronics: physics, materials, applications | Year: 2012

The molecular design strategies for the host materials suitable for highly efficient, blue fluorescent organic light-emitting diodes (OLEDs) are demonstrated. The device characteristics of blue fluorescent OLEDs are compared with different host materials. Some devices exhibit a highly efficient blue electroluminescence with a high external quantum efficiency of more than 7%. The correlation between OLED efficiency and triplet-triplet annihilation is characterized by measuring the up-conversion of triplet excited states into singlet ones. The host materials require an anthracene unit and a bulky molecular structure to prevent the overlap of anthracene units between adjacent molecules in the film. © 2012 Elsevier B.V. All rights reserved.


Fukagawa H.,Japan Broadcasting Corporation NHK | Yokoyama N.,Hodogaya Chemical Co. | Irisa S.,Hodogaya Chemical Co. | Tokito S.,Japan Broadcasting Corporation NHK
Advanced Materials | Year: 2010

An electron-transporting host material suitable for deep-blue phosphorescent organic light-emitting diodes has been developed. The material exhibits electron-transport characteristics, high triplet energy, and high thermal stability. It is designed by integrating electron-transporting pyridoindole substituents into a bulky adamantane core (see Figure), and is demonstrated to be an excellent host for deep-blue phosphorescent dopant emitters. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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