Samsung Display Devices Co., Ltd.

Bong-uk Jeong

Chang-seob Kim

Sang-kyun Kim

Seok-bong Son

Sang-uk Shin

Seok-Bong Shon

Dong-Gil Jang

A cathode structure of an electron gun for a cathode ray tube includes: a substrate (51); cathode electrode layers (52) formed on the substrate (51) and spaced apart from each other at predetermined intervals; a plurality of metal tips (53); an insulating layer (54) formed on the cathode electrode layers (52) and the substrate (51) to isolate each of the metal tips (53) from each other; a gate electrode layer having a first gate electrode portion (56) having a gate through which the metal tips (53) are exposed and formed on top of the insulating layer (54), and a second gate electrode portion (57) extending horizontally from said first gate portion (56) and divided into several parts by a plurality of gaps (60) for reducing the capacitance between the cathode electrode layers (52) and the second gate electrode portion (57).

Cathode structure with reduced capacitance

In an electron gun for a color cathode ray tube including a cathode structure having three electrodes, a control electrode and a screen electrode, and a plurality of focus electrodes and last accelerating electrodes for forming electron lenses, the cathode structure includes a rimmed electrode member, an insulating member inserted into the electrode member and having an indentation formed on the upper surface thereof, a field emission array cell having a base member which is inserted into the indentation, and a plurality of supporting members installed at the insulating member for pressing down on the upper surface of the edge of the field emission array cell which is inserted into the indentation toward the upper surface of the insulating member. Thus, the strength of attachment between the insulating member and a field emission device is improved.

Cathode structure and electron gun for cathode ray tube using the same

A directly heated cathode structure includes a porous pellet impregnated with a thermionic emission material, a supporter for applying electrical power, and a filament fixed to the porous pellet, having an end, and fixed to the supporter, wherein the filament includes a connecting portion wider than the filament and fixed to the supporter at the end of the filament. The cathode structure is suitable for a color CRT such as a color television or a CRT for industrial use and having a large screen.

Directly heated cathode structure

A directly heated cathode structure includes at least one porous pellet containing electron emission material and filaments secured to at least three side surfaces of the porous pellet to support the pellet stably and prevent vibration caused by shock and potential deformation. Each filament is supported by an insulating block and more than one pellet may be mounted on a single insulating block. As a result, a highly reliable cathode ray tube can be manufactured.

A directly heated cathode structure includes a porous pellet impregnated with an electron radiating material, a cup-shaped container holding the porous pellet, a metal member welded to the container, and a filament between the container and the metal member, restricting thermionic emission through the base and sides of the pellet and extending the life of the cathode structure.

A directly heated cathode structure includes a porous pellet impregnated with a cathode material, a first metal member fixed to a surface of the porous pellet, a second metal member welded to the first metal member, and a filament interposed between the first and second metal members. A method for manufacturing a directly heated cathode structure includes manufacturing a porous pellet having a multiplicity of cavities, welding a first metal member to a surface of the porous pellet with a brazing layer, impregnating the cavities of the pellet with an electron radiating material, and welding a second metal member to the first metal member with a filament disposed between the first and second metal members. The useful life of the cathode structure is prolonged since thermions are not emitted through the surface of the pellet covered by the metal member.

A directly heated cathode structure includes a porous pellet impregnated with a cathode material, filaments connected to the porous pellet, a support supporting the filament, and an insulation block supporting the support, wherein the filaments are supported on the porous pellet by at least one auxiliary member. The supporting structure is very strong and the quality and productivity can be greatly improved by improvement of the filament welding process using the auxiliary members.

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Seoul, South Korea

Bong-uk Jeong