Samsung Display Devices Co., Ltd.

Samsung Sdi Co., Inc.

Kwi-seok Choi

Jong-seo Choi

Sang-Jin Lee

Sang-won Lee

Seung-Min Ryu

Gyu-nam Ju

Keun-Bae Kim

Kwang-min Lee

Kyung-cheon Shon

Kyu-nam Joo

Dong-Yol Yang

Su-chan Lee

Suk-Hee Park

A plasma display panel includes front and rear substrates; anodes in a stripe pattern on a facing surface of the front substrate; a lower electrode coating the entire facing surface of the rear substrate; a dielectric layer coating the lower electrode; an upper electrode coating the dielectric layer in a pattern; and a lattice of partition walls between the upper electrode and the front substrate. The portions of the dielectric layer between the partition walls and not coated with the upper electrode form respective pixels. Sputtering is minimized and there is less damage to the electrodes by the gas, thus extending the length of use of the product. The ferroelectric material of the lower electrode has excellent resistance with respect to the discharge gas and the discharge can be initiated with a low initial discharge starting voltage since the ferroelectric cathode provides enough electrons for the discharge.

Plasma display device with ferroelectric dielectric layer

A cathode for an electron tube includes a layer of a electron emitting substance containing alkaline earth metal oxides containing 0.01--20.0 wt % of both a lanthanum compound and a magnesium compound or a lanthanum-magnesium compound disposed on a base metal including nickel as a major component and tungsten as a minor component. The tungsten prevents embrittlement and ensures a continuing supply of fill barium in the electron-emitting substance. The cathode enjoys full interchangeability with the conventional oxide cathode and a 15-30% longer life span.

Cathode for electron tube

A cathode for an electron tube has a layer of electron-emissive substance containing alkaline earth metal carbonates having capillary crystals, to which 0.01-20.0 wt % of both a lanthanum (La) compound and a magnesium (Mg) compound or an La--Mg compound, based upon the weight of the alkaline earth metal carbonate, is added. The cathode enjoys full interchangeability with a conventional oxide cathode and a 15-20% longer lifetime.

An oxide cathode is provided including a metal base, an electron emissive material layer formed on the metal base and having barium as a main component, a heater for heating the electron emissive material layer, and a Ba evaporation restraining layer having a thickness ranging from 10.ANG. to 10,000.ANG. and consisting of at least one titanium compound formed on the electron emissive material layer.

Oxide cathode employing Ba evaporation restraining layer

An oxide cathode is provided including an electron emissive material layer including barium, a metal base, a sleeve and a heater, wherein the electron emissive material layer further includes 0.1 to 20 wt. % of tin or a tin compound, based on the total amount of the electron emissive material, and indium or an indium compound.

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Seoul, South Korea

Kwi-seok Choi