Patent ID: 7728504

Claim:
A light source, comprising: an anode, an anode substrate, the anode being configured on the anode substrate; a cathode; a cathode substrate, the cathode being configured on the cathode substrate, the anode and the cathode being oppositely configured to produce a spatial electrical field when a voltage is applied therebetween, the cathode comprising: an emitter layer, capable of emitting electrons for bombarding the anode when activated and controlled by the spatial electric field, the emitter layer comprising of carbon nanotubes, a low-melting-point glass, and conductive particles, the carbon nanotubes and the conductive particles being dispersed in the low-melting-point glass; wherein some of the carbon nanotubes are dispersed among the conductive particles and protrude out from the low-melting-point glass; and a conductive layer, located between the cathode substrate and the emitter layer for providing an electrical connection therebetween; a fluorescent layer, configured on a surface of the anode oppositely facing the emitter layer, so as to produce a fluorescence when bombarded by electrons emitted from the emitter layer; and a sealing means, the anode substrate, the cathode substrate, and the sealing means configuring an air-proofed space, receiving the anode, the cathode, and the fluorescent layer therein.