Patent ID: 6617772
Filing Date: 2003-09-09
Classification: H01J

Abstract:
A flat-panel display comprising:a first plate structure for emitting electrons; a second plate structure, situated opposite the first plate structure, for emitting light to produce an image upon receiving electrons emitted by the first plate structure, an electric field of average strength EAV being directed from the second plate structure to the first plate structure during operation of the display; and a spacer situated between the plate structures, the spacer comprising a spacer wall having a face that extends at least partway from either plate structure to the other plate structure, the wall's face having roughness which, as approximated by identical parallel cylindrical pores of pore diameter dP, corresponds to a wall porosity of at least 10% along the wall's face and a pore height hP of at least 15% of pore height parameter hMD that equals {square root over (2dP&egr;2DMD/eEAV)}, where e is the electron charge, and &egr;2DMD is the median departure energy of secondary electrons emitted by the wall, the roughness in the wall's face comprising depressions or/and protuberances in the wall's face, each depression or protuberance extending only partway across the wall's face.