Field emission display with amplification layer

A cathodoluminescent field emission display device, which comprises:

• a faceplate through which emitted light is transmitted from an inside surface to an outside surface of the faceplate for viewing;
• a cathode emitter for primary field emissions of electrons;
• an anode comprising a layer of electrically conductive material disposed between the inside surface of the faceplate and the cathode emitter;
• a light emitter layer of cathodoluminescent material capable of emitting light through the faceplate in response to bombardment by electrons emitted within the device, disposed between the anode and the cathode emitter;
• and
• an amplification layer disposed between the light emitter layer and the cathode emitter and having a thickness enabling penetration by impinging electrons and producing secondary emissions of electrons when bombarded by electrons within the device and for transport of the secondary emissions through the amplification material layer for ultimate contact with the light emitting layer.

A cathodoluminescent field emission display device which comprises:

• a transparent faceplate through which emitted light is transmitted from an inside surface to an outside surface of the faceplate for viewing;
• a cathode emitter for primary field emission of electrons;
• an anode comprising a transparent layer of electrically conductive material, disposed between the inside surface of the faceplate and the cathode emitter;
• a light emitter layer of cathodoluminescent phosphor material, for emitting light through the faceplate in response to bombardment by electrons emitted within the device, disposed between the anode and the cathode emitter;
• and
• an amplification enhancement layer, consisting essentially of an oxide of barium, beryllium, calcium, magnesium or strontium, and disposed between the cathode emitter and the light emitter layer, for enhanced secondary emissions of electrons which pass through the amplification enhancement layer for ultimate contact with the light emitter layer.

A cathodoluminescent field emission display device which comprises:

• a transparent faceplate through which emitted light is transmitted from an inside surface to an outside surface of the faceplate for viewing;
• a cathode emitter for primary field emissions of electrons;
• an anode comprising a transparent layer of electrically conductive material disposed between the inside surface of the faceplate and the cathode emitter;
• a light emitter layer of cathodoluminescent phosphor material for emitting light through the faceplate in response to bombardment by electrons emitted within the device, disposed between the anode and the cathode emitter;
• and
• a layer consisting essentially of magnesium oxide disposed between the cathode emitter and the light emitter layer for enhanced secondary emissions of electrons which pass through the amplification enhancement layer for ultimate contact with the light emitter layer.

A cathodoluminescent field emission display device which comprises:

• a transparent faceplate through which emitted light is transmitted for viewing;
• a cathode emitter for primary field emission of electrons;
• an anode comprising a transparent layer of electrically conductive material disposed between the inside surface of the faceplate and the cathode emitter;
• a light emitter layer of cathodoluminescent phosphor material for emitting light through the faceplate in response to bombardment by electrons emitted within the device, disposed between the anode and the cathode emitter;
• and
• a layer consisting essentially of beryllium oxide disposed between the cathode emitter and the light emitter layer for enhanced secondary emissions of electrons which pass through the amplification enhancement layer for ultimate contact with the light emitter layer.

An electron emitting device for producing secondary emissions of electrons, comprising:

• a primary electron source for providing primary emissions of electrons;
• an anode for collecting electrons within the device;
• and
• an amplification material layer disposed between the anode and cathode electron emitter for producing secondary emissions of electrons when bombarded by electrons which pass through the amplification enhancement layer for ultimate contact with the light emitter layer.