Flat-panel display having spacer with rough face for inhibiting secondary electron escape

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;
• and
• a spacer situated between the plate structures, the spacer comprising a main spacer body having a face that extends at least partway from either plate structure to the other plate structure, multiple pores extending into the main body along its face such that the main body has a porosity of at least 10% along the main body's face, the pores having an average diameter of 1-1,000 nm and averagely extending deeper into the main body than their average diameter, each pore laterally surrounded by material of the main body where that pore reaches the main body's face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer comprising (a) a primary spacer body having a face that extends at least partway from either plate structure to the other plate structure, multiple pores extending into the primary body along its face such that the primary body has a porosity of at least 10% along the primary body's face, each pore laterally surrounded by material of the primary body where that pore reaches the primary body's face, and (b) a coating overlying the primary body's face in a generally conformal manner such that the coating has a rough face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising (a) a spacer substrate and (b) a porous layer that overlies the substrate and has a face spaced apart from the substrate, the porous layer having an average electrical resistivity of 108-1014 ohm-cm at 25° C., an average thickness of no more than 20 μm, and a porosity of at least 10% along the porous layer's face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising a main spacer body in which multiple grains have outer grain surfaces that at least partially define a rough face of the main body, the outer grain surfaces being shaped to provide the main body's rough face with a directional roughness characteristic in which, along the upper halves of the heights of the outer grain surfaces, the outer grain surfaces generally visible from the first plate structure are of greater average steepness than the outer grain surfaces generally visible from the second plate structure.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising a main spacer body having a rough face in which there are multiple depressions generally shaped as notches, each extending only partway across the wall's face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising a main spacer body having a rough face in which there are multiple three-dimensionally rounded recessions, most of the rounded recessions having portions of roughly constant radius of curvature, each rounded recession laterally surrounded by material of the main body where that rounded recession reached the main body's face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising an electrically non-insulating main spacer wall having a rough face in which there are (a) depressions generally shaped as trenches or/and (b) protuberances generally shaped as ridges, each trench or ridge extending only partway across the wall's face.

A flat-panel display comprising:

• a first plate structure for emitting electrons;
• a second plate structure, situated opposite the first plate structure, for producing an image upon receiving electrons emitted by the first plate structure;
• and
• a spacer situated between the plate structures, the spacer comprising an electrically non-insulating main spacer body having a rough face in which there are protuberances generally shaped as pillars or/and spires, each pillar or spire extending only partway across the main body's face.