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Furue H.,Tokyo University of Science | Sugimoto Y.,Tokyo University of Science | Iwami K.,Tokyo University of Science | Weng W.,Funai Electrical Advanced Technology Research Institute | Ono M.,Funai Electrical Advanced Technology Research Institute
Molecular Crystals and Liquid Crystals | Year: 2015

Laser speckle noise occurs owing to the strong interference that originates in the high coherency of laser light and the surface topography of screen. The suppression of the speckle noise is necessary for laser displays such as an image projection system. To reduce the speckle noise, we have tried to control the speckle pattern by using liquid crystals (LCs). In this paper, we offer an idea for suppressing the speckle noise using a polymer-dispersed LC (PDLC) cell in which the speckle pattern can be varied in addition to the optical diffusive effect. Copyright © Taylor & Francis Group, LLC. Source


Iwami K.,Tokyo University of Science | Shunsuke,Tokyo University of Science | Koizumi Y.,Funai Electrical Advanced Technology Research Institute | Ono M.,Funai Electrical Advanced Technology Research Institute | Furue H.,Tokyo University of Science
Molecular Crystals and Liquid Crystals | Year: 2014

Laser speckle noise occurs owing to the strong interference that originates in the high coherency of laser light and the surface topography of the screen. The suppression of the speckle noise is necessary for laser displays such as in an image projection system. In order to reduce speckle noise, we try to control the speckle pattern by using liquid crystals (LCs) that have electrically controllable optical characteristics. In this paper, we formulate an idea for suppressing speckle noise using a voltage-gradient LC cell and a polymer-dispersed LC cell. © 2014 Taylor & Francis Group, LLC. Source


Furue H.,Tokyo University of Science | Terashima A.,Tokyo University of Science | Shirao M.,Tokyo University of Science | Koizumi Y.,Funai Electrical Advanced Technology Research Institute | Ono M.,Funai Electrical Advanced Technology Research Institute
Japanese Journal of Applied Physics | Year: 2011

Laser speckle noise occurs owing to the strong interference that originates in the high coherency of laser light and the surface topography of the screen. The suppression of the speckle noise is necessary for laser displays such as in an image projection system. In order to reduce speckle noise, we try to control the speckle pattern by using liquid crystals that have electrically controllable optical characteristics. The modulation of polarized light using the birefringence of liquid crystals is very effective. However, the ratio of noise reduction does not exceed 30%. This is because the polarized light transmitted through the liquid crystal medium is formed by only two optical eigenmodes. The wedge-type liquid crystal cell can control the position of the laser spot on the screen. The incident-angle modulation of laser light is also effective for noise reduction. © 2011 The Japan Society of Applied Physics. Source


Akaogi J.,Tokyo University of Science | Koizumi Y.,Tokyo University of Science | Koizumi Y.,Funai Electrical Advanced Technology Research Institute | Ono M.,Tokyo University of Science | And 2 more authors.
Molecular Crystals and Liquid Crystals | Year: 2014

Liquid crystals (LCs) are attractive for optical devices, such as lenses because of their large birefringence and high response to external field. However, the low-speed response of nematic LCs often becomes an obstacle to the progress of LC devices. In this study, we research the lens effect of ferroelectric LC by using a voltage-gradient cell. As a result, it is found that in order to obtain the lens effect in FLC, the wide cell gap, the large tilt angle and/or the large birefringence of FLC materials are necessary to increase the birefringence variation under the gradient voltage in addition to the monostabilization of FLC media. © 2014 Taylor & Francis Group, LLC. Source


Aizumi S.,Tokyo University of Science | Shira M.,Tokyo University of Science | Yamamuro Y.,Tokyo University of Science | Koizumi Y.,Funai Electrical Advanced Technology Research Institute | And 2 more authors.
Journal of Photopolymer Science and Technology | Year: 2013

For liquid crystal displays, it is an ideal that the birefringence of liquid crystal medium does not vary in whole visible light region. Although the wavelength dispersion of the birefringence can be made small by utilizing an optical phase difference film, the precise control is needed for attachment of the film. In this study, in order to realize the phase-separated composite organic film (PSCOF) structure for the fabrication technology of liquid crystal display without external attachment of the film, we research in detail the fabrication condition of PSCOF liquid crystal cell. In this research, we used lots of alignment film and UV curable monomer materials. As a result, it is found that the most important factor for the realization of a uniform PSCOF structure is the wettability of liquid crystal materials to the alignment film and monomer materials to ITO surface. © 2013SPST. Source

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