Patent ID: 7821193

Claim:
A color pixel element for field emission display, the color pixel element comprising: a sealed container having a light permeable portion; a cathode; at least two anodes spaced from the light permeable portion; at least two phosphor layers, wherein each one of the at least two phosphor layers is formed on an end surface of a corresponding anode and spaced from the light permeable portion; and at least two CNT strings electrically connected to and contacting the cathode, wherein each one of the at least two CNT strings has an emission portion corresponding to one of the at least two phosphor layer; each one of the at least two CNT strings comprises a plurality of first CNT bundles and a plurality of second CNT bundles, the plurality of second CNT bundles are taller than and project over the plurality of first CNT bundles, and each of the plurality of second CNT bundles functions as an electron emitter; wherein the cathode, the at least two anodes, the at least two phosphor layers, and the at least two CNT strings are enclosed in the sealed container.