US Patent 7589798 - Touch panel having upper electrode plate including electrode, polarizing plate, quarter wave plate and heat-resistant transparent resin plate

Touch panel having upper electrode plate including electrode, polarizing plate, quarter wave plate and heat-resistant transparent resin plate

Document Number

US Patent 7589798

Issued Date

September 15, 2009

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Inventors

Takahata; Kazuhiko (Kyoto,JP)

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Hashimoto; Takao (Kyoto,JP)

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Nishikawa; Kazuhiro (Kyoto,JP)

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Asakura; Takeshi (Kyoto,JP)

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Abstract

An upper electrode plate has a 0.15 to 0.8 mm thick optically isotropic heat-resistant transparent resin plate having a glass transition temperature characteristic of not less than 150.degree. C. The heat-resistant transparent resin plate is laminated directly or indirectly on a quarter wave plate all over their surfaces.