Electron emission device and electron emission display device using the same

An electron emission display device comprising:

• a first substrate;
• a second substrate facing the first substrate;
• a cathode electrode formed on the first substrate;
• a gate electrode crossing the cathode electrode and insulated from the cathode electrode;
• an electron emission region electrically connected to the cathode electrode;
• a phosphor layer formed on a surface of the second substrate;
• and
• an anode electrode formed on a surface of the phosphor layer,
• wherein the cathode electrode comprises a main electrode with an inner opening portion, an isolate electrode placed in the opening portion and spaced apart from the main electrode by a distance, and a resistance layer disposed between the main electrode and the isolate electrode, the isolate electrode having a via hole,
• wherein the electron emission region contacts the isolate electrode, and is placed in the via hole, and
• wherein the isolate electrode has a first height, and the electron emission region has a second height smaller than the first height.

An electron emission display device comprising:

• a first substrate;
• a second substrate facing the first substrate;
• a cathode electrode formed on the first substrate;
• a gate electrode crossing the cathode electrode and insulated from the cathode electrode;
• an electron emission region electrically connected to the cathode electrode;
• a phosphor layer formed on a surface of the second substrate;
• and
• an anode electrode formed on a surface of the phosphor layer,
• wherein the cathode electrode comprises a main electrode with an inner opening portion, an isolate electrode placed in the opening portion and spaced apart from the main electrode by a distance, and a resistance layer disposed between the main electrode and the isolate electrode, the isolate electrode having a via hole,
• wherein the electron emission region is placed in the via hole, and
• wherein the isolate electrode is adapted to provide a concave equipotential line toward the second substrate and over the electron emission region.