Planar display apparatus

A planar display apparatus comprising:

• an electron emission source for emitting electrons to a phosphor screen provided on an inside surface of a sealed container;
• a surface insulated substrate provided between said electron emission source and said phosphor screen and provided with a plurality of electron-passing holes;
• and
• control electrodes composed of a plurality of separate conductive films, said plurality of separate conductive films being formed on said surface insulated substrate and having a passing electron controlling potential applied thereto;
• said surface insulated substrate being composed of a conductive substrate and an insulation layer provided on a surface of said conductive substrate;
• said control electrodes being formed on said insulation layer;
• said electron-passing holes each being composed of a pair of surface hole portions and an inner hole portion, one surface hole portion being provided on an upper surface and another surface hole portion being provided on an undersurface of said surface insulated substrate to a predetermined depth, said inner hole portion having a diameter which is smaller than diameters of said pair of surface hole portions.

A method of forming electron-passing holes and control electrodes in a planar display apparatus comprising the steps of:

• (a) forming surface hole portions on both surfaces of an insulated substrate;
• (b) forming conductive films on all surfaces of the surface insulated substrate including the surface hole portions, the conductive films forming the control electrodes;
• and
• (c) forming an inner hole portion in a pair of surface hole portions by boring a hole through one surface hole portion to another surface hole portion such that a diameter of the inner hole portion is smaller than diameters of the surface hole portions.

A television receiver comprising:

• a receiver for converting incoming television signals into television picture signals;
• a planar display apparatus for displaying television pictures;
• and
• display control means for controlling said planar display apparatus on the basis of said television picture signals applied from said receiver;
• said planar display apparatus including,
• an electron emission source for emitting electrons to a phosphor screen provided on an inside surface of sealed container;
• a surface insulated substrate provided between said electron emission source and said phosphor screen and provided with a plurality of electron-passing holes, and
• control electrodes composed of a plurality of-separate conductive films formed on said surface insulated substrate and having a passing electron controlling potential applied thereto;
• said surface insulated substrate being composed of a conductive substrate and an insulation layer provided on a surface of said conductive substrate;
• said control electrodes being formed on said insulation layer;
• said electron-passing holes each being composed of a pair of surface hole portions and an inner hole portion, one surface hole portion being provided on an upper surface and another surface hole portion being provided on an undersurface of said surface insulated substrate to a predetermined depth, said inner hole portion having a diameter which is smaller than diameters of said pair of surface hole portions.

A planar display apparatus comprising:

• an electron emission source for emitting electrons to a phosphor screen provide on the inside of a sealed container;
• a surface insulated substrate composed of a conductive substrate;
• said surface insulated substrate being provided between said electron emission source and said phosphor screen and provided with a plurality of electron-passing holes;
• said surface insulated substrate also being composed of an insulating film formed on said conductive substrate;
• control electrodes formed on said insulating film of said surface insulated substrate and having a passing electron controlling potential applied thereto;
• and
• voltage applying means for applying a predetermined voltage to said conductive substrate of said surface insulated substrate.

A planar display apparatus comprising:

• an electron emission source for emitting electrons to a phosphor screen provided on an inside surface of a sealed container;
• a surface insulated substrate composed of a conductive substrate;
• said surface insulated substrate being provided between said electron emission source and said phosphor screen and provided with a plurality of electron-passing holes;
• said surface insulated substrate also being composed of an insulating film formed on said conductive substrate;
• and
• control electrodes formed on said insulating film of said surface insulated substrate and having a passing electron controlling potential applied thereto;
• said surface insulated substrate being provided between adjacent control electrodes such that a portion of said conductive substrate is exposed;
• said electron-passing holes each being composed of a pair of surface hole portions and an inner hole portion, one surface hole portion being provided on an upper surface and another surface hole portion being provided on an undersurface of said surface insulated substrate to a predetermined depth, said inner hole portion having a diameter which is smaller than diameters of said pair of surface hole portions.