Dr. Yasuo Fujimura Profile

Dr. Yasuo Fujimura

at Nitto Denko Corp

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Publications (3)

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Proceedings Article | 5 January 2004 Paper

High-performance optical films for LCDs

Yasuo Fujimura, Takeshi Kamijo, Hiroyuki Yoshimi

Proceedings Volume 5213, (2004) https://doi.org/10.1117/12.505569

KEYWORDS: Polarizers, LCDs, Circular polarizers, Reflectivity, Absorption, Polarization, Refractive index, Chemical species, Reflectors, Transmittance

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Optical performance of the LCD is strongly affected by optical films such as polarizers and retardation films. The characteristics of polarizers, which determine the contrast ratio and the hue balance of the LCD, need to be improved, in particular, to meet the current requirements on high-performance LCDs. Most polarizers for LCDs are made from polyvinyl-alcohol (PVA) films and iodine compounds by the wet dyeing method. Polarizers with high polarization efficiency and transmittance can be obtained by optimizing the dyeing and stretching conditions. In transmissive LCDs, blue decolorization in black images need to be improved by controlling the chemical species of PVA-iodine complexes. The authors analyzed the dichroic ratios of chemical species by separating each absorption peak, and presented a guide for the neutralization of the hue balance of polarizers. The characteristics of reflective LCDs, on the other hand, are largely dependent on the optical design of circular polarizers and quarter-wave plates, which constitute the circular polarizers. The important design elements of reflective LCDs include wavelength dispersion and viewing angle characteristics. The authors have contributed to the improvement of the performance of reflective LCDs by enhancing the characteristics of polymer films using stretching and optical lamination technologies.

Proceedings Article | 30 April 2003 Paper

Improvement of optical films for high-performance LCDs

Yasuo Fujimura, Takeshi Kamijo, Hiroyuki Yoshimi

Proceedings Volume 5003, (2003) https://doi.org/10.1117/12.473857

KEYWORDS: Polarizers, LCDs, Circular polarizers, Reflectivity, Absorption, Polarization, Refractive index, Chemical species, Polymer thin films, Polymers

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Proceedings Article | 16 August 1996 Paper

Optical films for liquid crystal display

Yasuo Fujimura

Proceedings Volume 2873, (1996) https://doi.org/10.1117/12.246253

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We have developed a super high contrast polarizer (EG type). This new polarizer enhances the light transmittance of liquid crystal displays by more than 10%. We have also developed a retardation film with controlled 3D refractive index. This retardation film improves the viewing angle of LCD's.

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