Display device and spacer for display device

A flat panel display device comprising:

• a cathode substrate including an electron source;
• an anode substrate including a fluorescent substance which emits light upon receiving electrons emitted from the electron source;
• and
• a spacer disposed between the cathode substrate and the anode substrate and supporting the both substrates,
• wherein the spacer comprises:
• a glass substrate;
• a first metal oxide thin film exhibiting a semiconductor-like electrical conductivity, the first metal oxide thin film being directly formed on a side surface of the glass substrate;
• a second metal oxide thin film into which particles exhibiting metal-like electrical conductivity are dispersed, the second metal oxide thin film being formed on an outside of the first metal oxide thin film;
• and
• a third metal oxide thin film exhibiting semiconductor-like electrical conductivity, the third metal oxide thin film being formed on an outside of the second metal oxide thin film.

A flat panel display device comprising:

• a cathode substrate including an electron source;
• an anode substrate including a fluorescent substance which emits light upon receiving electrons emitted from the electron source;
• and
• a spacer disposed between the cathode substrate and the anode substrate and supporting the both substrates,
• wherein the spacer comprises a glass substrate and a thin film formed on a side surface thereof,
• wherein the thin film comprises:
• particles exhibiting metal-like electrical conductivity;
• a metal oxide layer exhibiting an insulator-like electrical characteristic which covers surfaces of the particles;
• and
• a composite metal oxide into which said particles are dispersed, and
• wherein the composite metal oxide comprises a solid solution of a metal oxide having semiconductor-like electrical conductivity and a metal oxide having insulator-like electrical conductivity.

A flat panel display device comprising:

• a cathode substrate including an electron source;
• an anode substrate including a fluorescent substance which emits light upon receiving electrons emitted from the electron source;
• and
• a spacer disposed between the cathode substrate and the anode substrate and supporting the both substrates,
• wherein the spacer comprises a glass substrate and, on a surface of the glass substrate, an oxide thin film exhibiting metal-like electrical conductivity, and
• wherein the oxide thin film is formed of a solid solution composed of an oxide exhibiting metal-like electrical conductivity and an oxide having a higher resistance than the former oxide.