Tatsuo Igawa
Hitachi
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Publication
Featured researches published by Tatsuo Igawa.
Japanese Journal of Applied Physics | 1988
Tetsuya Nagata; Takao Umeda; Tatsuo Igawa; Akio Mukoh; Yasuro Hori
The relation between physical properties of ferroelectric liquid crystals (FLCs) and the AC field stabilization effect is described. The AC field-stabilization effect depends on a dielectric anisotropy Δe and a tilt angle θ. We introduced the parameter α defined by α=-Δesin 2θ and experimentally clarified that the FLCs with a large value of the parameter α showed a large AC field-stabilization effect. This is confirmed by using a FLC mixture with a large value of α so that the alignment state reset by a DC electric field is completely maintained for a certain time by superposing a high-frequency AC electric field to the DC electric field, even if the polarity of the DC electric field changes.
IEEE Transactions on Electron Devices | 1989
Tetuya Nagata; Takao Umeda; Tatsuo Igawa; Yasuro Hori; Akio Mukoh
The influences of the spontaneous polarization (P/sub s/) and reorientational viscosity ( eta ) on the AC field-stabilization effect were studied experimentally by using four ferroelectric liquid-crystal (FLC) compounds that have different P/sub s/ and eta values. Delays in the response time originating from the AC field-stabilization effect were measured. Those FLC compounds with small P/sub s/ and low eta were found to be suitable for realizing both a large AC field-stabilization effect and quick response. >
international display research conference | 1988
Tetuya Nagata; Takao Umeda; Tatsuo Igawa; Akio Mukoh; Yasuro Hori
The influence of spontaneous polarization, P/sub s/ and rotational viscosity, eta , on the AC field-stabilization effect are studied by using four ferroelectric liquid crystal (FLC) compounds which have different P/sub s/ and eta . In the experiments, the delay of the response time originating from the AC field-stabilization effect is measured. It is found that FLC compounds with small P/sub s/ and low eta are suitable for realizing both large AC field-stabilization effect and quick response.<<ETX>>
Archive | 1981
Takao Umeda; Tatsuo Igawa; Yuzuru Simazaki; Takao Miyashita; Fumio Nakano
Archive | 1984
Takao Umeda; Kazuya Ooishi; Tatsuo Igawa; Yasuro Hori; Yoshiharu Nagae; Masato Isogai
Archive | 1997
Takao Kumasaka; Kunio Fukuchi; Masayasu Anzai; Tatsuo Igawa
Archive | 1983
Takao Umeda; Takao Miyashita; Yuzuru Shimazaki; Tatsuo Igawa; Ken Sasaki; Shigeru Matsuyama
Archive | 1990
Tetsuya Nagata; Takao Umeda; Tatsuo Igawa
Archive | 1992
Tetuya Nagata; Takao Umeda; Takao Takuma; Tatsuo Igawa; Masato Miwa
Archive | 2000
Mamoru Okano; Yoshinobu Fukano; Seiji Yonekura; Tatsuo Igawa; Kazuhito Masuda
