Visual display

A visual display comprising a field effect emission device for a visual display, the field effect emission devise including:

• a multilayer substrate having a front substrate layer and at least one additional substrate layer and
• an emission layer on one face of the substrate, the emission layer having:
• a multiplicity of emitters and gates, arranged as an array of emission pixels and
• conductive connections in the emission layer to the emitters and the gates;
• the substrate having:
• conductive vias provided through the front layer thereof to at least some of the said conductive connections in the emission layer for electrical connection to their emitters and gates, the front layer vias being in the body of the emitters and the gates,
• conductive vias provided through the or each additional substrate,
• electrical interconnection tracks provided at the interface(s) between the or each adjacent pair of substrate layers for electrical interconnection of the vias of the pair(s) of adjacent layers,
• the arrangement of the vias and the interconnection tracks being such that the position of a via in the front substrate layer is off-set from that of a via in a back one of the additional substrate layer(s) to which it is electrically connected,
• electrical connections being provided on an outer face of a back one of the additional substrate layer(s) opposite from the front substrate layer,
• the visual display further including:
• a glass face plate incorporating phosphor material selectively excitable by the emission device pixels;
• and
• fused sealing material peripherally sealing the face plate to the emission device, whereby the face plate is parallelly spaced from the emission layer of the emission device and the space therebetween is evacuated,
• wherein the visual display furthermore includes a carrier attached to the face of the emission device opposite from its emission layer.

A visual display comprising a field effect emission device for a visual display, the field effect emission devise including:

• a multilayer substrate having a front substrate layer and at least one additional substrate layer and
• an emission layer on one face of the substrate, the emission layer having:
• a multiplicity of emitters and gates, arranged as an array of emission pixels and
• conductive connections in the emission layer to the emitters and the gates;
• the substrate having:
• conductive vias provided through the front layer thereof to at least some of the said conductive connections in the emission layer for electrical connection to their emitters and gates, the front layer vias being in the body of the emitters and the gates,
• conductive vias provided through the or each additional substrate,
• electrical interconnection tracks provided at the interface(s) between the or each adjacent pair of substrate layers for electrical interconnection of the vias of the pair(s) of adjacent layers,
• the arrangement of the vias and the interconnection tracks being such that the position of a via in the front substrate layer is off-set from that of a via in a back one of the additional substrate layer(s) to which it is electrically connected,
• electrical connections being provided on an outer face of a back one of the additional substrate layer(s) opposite from the front substrate layer,
• the visual display further including:
• a glass face plate incorporating phosphor material selectively excitable by the emission device pixels;
• and
• fused sealing material peripherally sealing the face plate to the emission device, whereby the face plate is parallelly spaced from the emission layer of the emission device and the space therebetween is evacuated,
• wherein the visual display furthermore includes an array of spacers between the face plate and the emission device, wherein one or more of the spacers within the area of the phosphor material and the emission layer, i.e. the inner spacers, carries an electrical track for repelling emitted electrons.