Kabushiki Kaisha Toyota Chuo Kenkyusho

Ai Kobayashi

Arimitsu Usuki

Hiromitsu Tanaka

Kazuo Tojima

Hisato Takeuchi

Atsushi Shirasawa

Disclosed is a dichroic crystal including at least one member selected from the group consisting of phtharocyanine, a phtharocyanine derivative, phtharocyanine with a central metal introduced therein, a phtharocyanine derivative with a central metal introduced therein, and iodine. It is precipitated when the iodine is added to a solution containing the member, and it includes the iodine in a form of I.sub.3.sup.- and I.sub.5.sup.- ions. It not only has a high dichroic property but also superb heat resistance and weatherability, so that it is applicable to suspended particles display devices used in severe environments.

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Toyota, Japan

Ai Kobayashi