Color variable field emission device

A color variable field emission device, comprising:

• a cathode substrate and an anode substrate that are disposed to face each other with a predetermined distance therebetween;
• first, second and third cathode electrode blocks formed on the cathode substrate to be electrically separated from each other;
• first, second and third field emitter blocks formed on the first, second and third cathode electrode blocks, respectively, in predetermined patterns;
• an anode electrode formed on the anode substrate;
• red, green and blue fluorescent layers formed on the anode electrode to correspond to the first, second and third field emitter blocks, respectively, in predetermined patterns;
• a gate electrode disposed between the cathode substrate and the anode substrate to induce electron emission from each of the field emitter blocks;
• and
• a plurality of current switching circuits electrically connected to each of the cathode electrode blocks to individually control current that flows into each of the cathode electrode blocks,
• wherein when the current that is applied to each of the cathode electrode blocks is individually adjusted through the current switching circuits with a predetermined anode voltage applied to the anode electrode and a predetermined gate voltage applied to the gate electrode over time, the amount of electrons emitted from the first, second and third field emitter blocks formed on the cathode electrode blocks, respectively, is adjusted, so that emission intensity of light emitted from the red, green and blue fluorescent layers is individually adjusted.