Electron emission device with improved focusing of electron beams

A method of focusing electrons emitted from electron emission regions in an electron emission device to corresponding light emitting regions, the electron emission regions being on cathode electrodes on a first substrate, the corresponding light emitting regions being on a second substrate separated from the first substrate, the method comprising:

• forming gate electrodes over the cathodes electrodes, the gate electrodes being separated from the cathode electrodes by an insulating layer and having gate openings exposing respective electron emission regions at crossings of the gate electrodes and the cathode electrodes;
• wherein the cathode electrodes have an internal cathode region within respective gate openings and support at least one electron emission region and are separated from an external cathode region by focusing electrodes parallel to the cathode electrodes, the focusing electrodes filling a gap between opposing faces of the internal cathode region and the external cathode region.