Abstract:
A face plate (10) of an FED image display has a grooved rear surface (25) formed with projections (36). Projections (36) have surfaces (39) covered in regions (58, 59) with electrical conductive material (54) and different color emitting phosphor particles (56a, 56b). The regions (58, 59) define different color anode combs. Surfaces (39) in regions (61) between regions (58,59) are covered with insulative, light absorbing material (62) for absorption of ambient light. Surfaces (39) are formed to encourage forward direction of phosphor-emitted light. In one embodiment, surfaces (39) serve to channel ambient light rearwardly toward projection apexes (40) which are covered with light absorbing material (62). Projections (36) may be parallel elongated prisms, pyramids or cones.
Abstract:
An anode plate 40 for use in a field emission flat panel display device comprises a transparent planar substrate 42 having a plurality of electrically conductive, parallel stripes 46 comprising the anode electrode of the device, which are covered by phosphors 48 R , 48 G and 48 B , and a gettering material 52 in the interstices of the stripes 46. The gettering material 52 is preferably selected from among zirconiumvanadium-iron and barium. The getter 52 may be thermally reactivated by passing a current through it at selected times, or by electron bombardment from microtips on the emitter substrate. The getter 52 may be formed on a substantially opaque, electrically insulating material 50 affixed to substrate 42 in the spaces formed between conductors 46, which acts as a barrier to the passage of ambient light into and out of the device. Methods of fabricating the getter stripes 52 on the anode plate 40 are disclosed.
Abstract:
A face plate (10) of an FED image display has a grooved rear surface (25) formed with projections (36). Projections (36) have surfaces (39) covered in regions (58, 59) with electrical conductive material (54) and different color emitting phosphor particles (56a, 56b). The regions (58, 59) define different color anode combs. Surfaces (39) in regions (61) between regions (58,59) are covered with insulative, light absorbing material (62) for absorption of ambient light. Surfaces (39) are formed to encourage forward direction of phosphor-emitted light. In one embodiment, surfaces (39) serve to channel ambient light rearwardly toward projection apexes (40) which are covered with light absorbing material (62). Projections (36) may be parallel elongated prisms, pyramids or cones.
Abstract:
A computer image display device includes a light transparent glass anode plate (10) spaced from a cathode substrate (12) which has a plurality of microtips (14). Plate (10) has an inside surface (25) which is contoured with an array of prisms (36) having equal sides (58, 59) that converge rearwardly toward apexes (38) of peaks (36). Apexes (38) are covered with light absorbing material (47), then covered at anode comb forming regions (51, 52, 53) with conductive material (48). Different color luminescing phosphors (24a, 24b, 24c) are applied over the respective anode combs (51, 52, 53). Sides (58, 59) direct ambient light toward apexes (38) for absorption by material (47). Light emitted by phosphors (24a, 24b, 24c) is directed by valleys (60) toward outside surface (35) of plate (10).
Abstract:
A field emission display electronics system includes a power reduction apparatus 40 in accordance with the present invention. The system includes a matrix-addressable emitter plate 14 and a voltage-switched trichromatic anode plate 10. In a reduced power consumption mode, the display is switched from a color mode to a monochrome mode, and power reduction apparatus 40 performs three functions, each of which contributes to power reduction of the display device. The first function disables the switched application of high voltage sequentially to the three combs of anode stripes 12 R , 12 G and 12 B , substituting the constant application of high voltage to all of the anode stripes 12, thus reducing the anode switching power to zero. The second function supplies a clock signal to column drivers 18 and row address counter/decoder 20 which is one-third the frequency of the clock signal used during color operation, thus reducing by two-thirds the capacitative power drop in row driver circuits 22, column driver circuits 18 and the emitter panel 14 over a color display. The third function performed by power reduction apparatus 40 is to provide display inversion. Data analyzer 60 senses the data being passed from the host to video controller 16, and determines whether the display data provided by video controller 16 to column drivers 18 should be altered so as to provide an inverted display. Three alternative schemata for controlling entry into the reduced power consumption mode are disclosed.
Abstract:
A computer image display device includes a light transparent glass anode plate (10) spaced from a cathode substrate (12) which has a plurality of microtips (14). Plate (10) has an inside surface (25) which is contoured with an array of prisms (36) having equal sides (58, 59) that converge rearwardly toward apexes (38) of peaks (36). Apexes (38) are covered with light absorbing material (47), then covered at anode comb forming regions (51, 52, 53) with conductive material (48). Different color luminescing phosphors (24a, 24b, 24c) are applied over the respective anode combs (51, 52, 53). Sides (58, 59) direct ambient light toward apexes (38) for absorption by material (47). Light emitted by phosphors (24a, 24b, 24c) is directed by valleys (60) toward outside surface (35) of plate (10).
Abstract:
The emitter plate 60 of a field emission flat panel display device includes a layer 68 of a resistive material and a mesh-like structure 62 of an electrically conductive material. A conductive plate 78 is also formed on top of resistive coating 68 within the spacing defined by the meshes of conductor 62. Microtip emitters 70, illustratively in the shape of cones, are formed on the upper surface of conductive plate 78. With this configuration, all of the microtip emitters 70 will be at an equal potential by virtue of their electrical connection to conductive plate 78. In one embodiment, a single conductive plate 82 is positioned within each mesh spacing of conductor 80; in another embodiment, four conductive plates 92 are symmetrically positioned within each mesh spacing of conductor 90. Also disclosed is an arrangement of emitter clusters comprising conductive plates 102 having a plurality of microtip emitters 104 formed thereon, or spaced thereform by a thin layer of resistive material, each cluster adjacent and laterally spaced from a stripe conductor 100 by a region 106 of a resistive material. The conductive stripes 100 are substantially parallel to each other, are spaced from one another by two conductive plates 102, and are joined by bus regions 110 outside the active area of the display.