AVS 47th International Symposium
    Flat Panel Displays Tuesday Sessions
       Session FP-TuP

Paper FP-TuP2
Optical Filters for Plasma Display Panels using Organic Dyes and Sputtered Multilayer Coatings

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: T. Okamura, Mitsui Chemicals, Inc., Japan
Authors: T. Okamura, Mitsui Chemicals, Inc., Japan
S. Fukuda, Mitsui Chemicals, Inc., Japan
K. Koike, Mitsui Chemicals, Inc., Japan
H. Saigou, Mitsui Chemicals, Inc., Japan
M. Yoshikai, Mitsui Chemicals, Inc., Japan
M. Koyama, Mitsui Chemicals, Inc., Japan
T. Misawa, Mitsui Chemicals, Inc., Japan
Y. Matsuzaki, Mitsui Chemicals, Inc., Japan
Correspondent: Click to Email
We describe optical filters for plasma display panels (PDP). PDP emit strong electromagnetic (EM) radiation and intense near-infrared light (NIR). The EM radiation is limited by regulations, and NIR emission causes malfunctions of devices working through NIR. The essential constituents of the developed optical filter are sputtered multilayer coatings and dye-containing layers. The sputtered multilayer coatings comprising alternate layers of metal and high-refractive material show both EM shielding effect and NIR cut-off ability without sacrificing high visible-light transparency. In addition, their reflectance should be reduced in order to improve viewability. Therefore the multilayer coatings are designed by utilizing optical admittance loci and the admittance diagrams to minimize interfacial reflection between the multilayer and the polymeric layer adjacent to it which protects the multilayer coatings and is used for adhering polymeric film such as an anti-reflection film. We obtained 7-layer (Silver and Indium-Tin-Oxide) coatings on polyethylene terephthalate substrates by roll-to-roll process, with surface resistance of 2.2@ohm@/sq., NIR transmittance of 1~12 % in 800~1200nm, visible-light transmittance > 74%, and interfacial reflectance < 0.5%. Since transparent colors of these coatings are usually greenish, we used dyes to neutralize the transparent color. The dyes are also applied to control color temperatures and minimum perceptible color differences of PDP. For this purpose, we have also developed a software tool to simulate optical designs for a given emission spectrum of PDP. The performance of this tool will be also presented.