Lg Electronics Inc.

Korea Institute of Science and Technology

Hee Bum Kang

Yoon H Kim

Dong K Lim

Jae K Park

Provided is a reflective screen. The reflective screen can be widely and commercially used, easily manufactured at low costs, and realize a sufficient reflection image. The reflective screen includes a substrate, a light diffusion layer in front of the substrate, a light reflecting material reflecting projection light, a light absorbing material absorbing external light, and a light absorption reflection layer containing at least the light reflecting material and the light absorbing material together. The light absorption reflection layer being disposed in the rear of the substrate.

Reflective screen and manufacturing method thereof

A light-transmissive alumina ceramic composition and a method for preparing the same are disclosed. The light-transmissive polycrystalline alumina ceramics composition comprises of 100 w/o of aluminum oxide having a purity of not less than 99.99%, approximately 0.03 to approximately 0.1 w/o of magnesium compound and approximately 0.002 to approximately 0.07 w/o of zirconium compound. The method is comprised of the steps of: molding mixture powder consisting of 100 w/o of aluminum oxide powder having a purity of not less than 99.99% added with from approximately 0.03 to approximately 0.1 w/o of magnesium oxide powder and from approximately 0.002 to approximately 0.07 w/o of zirconium oxide powder to obtain a molded substance; calcining said molded substance under the atmosphere to give a calcined substance having a strength suitable to processing; grinding the surface of said calcined substance smoothly; and sintering the resulting substance in a hydrogen atmosphere or a vacuum. The light-transmissive polycrystalline ceramics composition is preventive of the reflection and scattering of light. With the method for producing light-transmissive polycrystalline ceramics, the workability and the production yield are improved.

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Seoul, South Korea

Hee Bum Kang