Field emission display having improved capability of converging electron beams

A field emission display comprising:

• a first substrate and a second substrate provided opposing one another with a predetermined gap therebetween;
• a plurality of gate electrodes formed on a surface of the first substrate opposing the second substrate, the gate electrodes being formed in a striped pattern;
• an insulation layer formed on the first substrate covering the gate electrodes;
• a plurality of cathode electrodes formed on the insulation layer in a striped pattern to perpendicularly intersect the gate electrodes;
• a plurality of surface electron sources formed along one long side of the cathode electrodes;
• focusing units provided on the cathode electrodes for controlling emission of electron beams from the surface electron sources;
• an anode electrode formed on a surface of the second substrate opposing the first substrate;
• and
• a plurality of phosphor layers formed on the anode electrode,
• wherein the focusing units are extended electrodes, which are extended from a side surface of the cathode electrodes between a bottom surface of the cathode electrodes contacting the insulation layer and an edge portion of the cathode electrodes along which the surface electron sources are formed, the extended electrodes being formed at a predetermined length in a direction perpendicular to a long side direction of the cathode electrodes and at edges of each pixel region corresponding to areas of intersection between the gate electrodes and the cathode electrodes, and
• wherein the length of the extended electrodes in a direction perpendicular to the long side direction of the cathode electrodes is less than or equal to 95% of a distance between two adjacent cathode electrodes.

A field emission display comprising:

• a first substrate and a second substrate provided opposing one another with a predetermined gap therebetween;
• a plurality of gate electrodes formed on a surface of the first substrate opposing the second substrate, the gate electrodes being formed in a striped pattern;
• an insulation layer formed on the first substrate covering the gate electrodes;
• a plurality of cathode electrodes formed on the insulation layer in a striped pattern to perpendicularly intersect the gate electrodes;
• a plurality of surface electron sources formed along one long side of the cathode electrodes;
• focusing units provided on the cathode electrodes for controlling emission of electron beams from the surface electron sources;
• an anode electrode formed on a surface of the second substrate opposing the first substrate;
• and
• a plurality of phosphor layers formed on the anode electrode,
• wherein the focusing units are extended electrodes, which are extended from a side surface of the cathode electrodes between a bottom surface of the cathode electrodes contacting the insulation layer and an edge portion of the cathode electrodes along which the surface electron sources are formed, the extended electrodes being formed at a predetermined length in a direction perpendicular to a long side direction of the cathode electrodes and at edges of each pixel region corresponding to areas of intersection between the gate electrodes and the cathode electrodes, and
• wherein the length of the extended electrodes is greater than 95% but less than 100% of a distance between two adjacent cathode electrodes.