Patent ID: 7997950

Claim:
A method for manufacturing a field emitter comprising: providing a CNT array; drawing a plurality of CNT bundles from the CNT array to form a CNT yarn; soaking the CNT yarn into an organic solvent, and shrinking the CNT yarn into a CNT string after the organic solvent volatilizes; irradiating a predetermined point of the CNT string with a laser beam, and forming an oxidized defect; applying a voltage between two opposite ends of the CNT string, until the CNT string snaps, wherein the snapped CNT string comprises a broken end portion, the broken end portion comprises a plurality of CNT bundles, each of the plurality of CNT bundles has a taper shaped end comprising a plurality of CNTs, and some CNTs protrude from other adjacent CNTs; and attaching the snapped CNT string to a conductive base, and achieving a field emission electron source.