having an electric field parallel to the surface, e.g. thin film cathodes

Full Title

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps (details of electron-optical or ion-optical arrangements H01J3/00) > Main electrodes > Cold cathodes, e.g. field-emissive cathode > having an electric field parallel to the surface, e.g. thin film cathodes