Electronics and Telecommunications Research Institute

Wol-Yon Whang

Jang-Joo Kim

Tae-Hyoung Zyung

Min-Chul Oh

A color display device using an electroluminescent polymer includes: a transparent substrate; a transparent electrode formed on the transparent substrate, the electrode being buried by a luminescent polymer; a photo-bleached region (non-luminous region) of a first luminescent polymer formed on the transparent electrode; a non-photo-bleached region (luminous region) of a first luminescent polymer formed between a portion of the transparent electrode and a first metal electrode; a photo-bleached region (non-luminous region) of a second luminescent polymer formed on the photo-bleached region of the first luminescent polymer; a non-photo-bleached region (luminous region) of a second luminescent polymer formed between a portion of the photo-bleached region of the first luminescent polymer and a second metal electrode; a first metal electrode formed on the non-photo-bleached region of the first luminescent polymer; a photo-bleached region (non-luminous region) of a third luminescent polymer formed on the photo-bleached region of the second luminescent polymer; a non-photo-bleached region (luminous region) of a third luminescent polymer formed between a portion of the photo-bleached region of the second luminescent polymer and a third metal electrode; a second metal electrode formed on the non-photo-bleached region of the second luminescent polymer; and a third metal electrode formed on the non-photo-bleached region of the third luminescent polymer.

Color display device using electroluminescent polymer and method for

A TE-TM mode converter of a polymer electro-optic polarization waveguide type uses the electro-optic birefringence and the electro-optic effect as a non-linear optical waveguide medium, in which an optical director formed during the poling of a polymer thin film is determined by the direction of the poling electrical field. The poling electrode design enables the optical director having the angle of 45.degree. to the electrical direction of the TE and TM modes to be formed in the polymer thin film. When the waveguide receives the incident light of the TE mode or TM mode, the TE (or TM) mode is switched into the TM (or TE) mode by an effective refraction factor between the optical director and the director perpendicular thereto. If a length of the poling electrode and the birefringence of the waveguide is adjusted, the changes of various electo-optic polarization states are possible. The poled thin film has an electro-optic effect. If a voltage is applied to the thin film, the size of the birefringence derived by the poling is changeable. The use of the electro-optic effect enables the outputting state of the waveguide to be maintained at the TE or TM mode by a bias electrode, and if the switching voltage is applied to the waveguide, the TE-TM mode switching can be accomplished.

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Daejeon, South Korea

Wol-Yon Whang