Electric lamp and discharge devices – Discharge devices having a multipointed or serrated edge...
Patent
1995-07-18
1999-10-12
O'Shea, Sandra
Electric lamp and discharge devices
Discharge devices having a multipointed or serrated edge...
313336, 313351, 313495, 313496, H01J 0102, H01J 0116, H01J 1910, H01J 0162
Patent
active
059659718
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
1. Field of Invention
The invention relates in general to electronics and more specifically to an edge emitter display device, having particular reference to data display devices for use as a screen or display, as well as use in vacuum-tube microelectronics as super-high speed heat-and-radiation resistant devices.
2. Description of Prior Art
Known in the present state of the art is a cathode-luminescent display (cf. L'Onde Electrique, Novembre-Decembre 1991, Vol. 71, No. 6, pp. 36-42), comprising an array source of electrons and a screen situated above the surface of the source of electrons and electrically insulated from it.
The source of electrons is in fact a substrate, on which ribbon-type cathodes (arranged in columns) and gates (arranged in rows) are provided. The columns and rows are separated from one another by a dielectric layer and intersect one another. Holes are provided at the places of intersection of the ribbon-type gates (or rows) and the dielectric layer, and the holes are adapted to accept needle-type emitters whose bases are situated either directly on the ribbon-type cathode (or column) or on the layer of a load resistor applied to the ribbon-type cathodes. The tips of the needle emitters are at the level of the edges of the holes in the ribbon-type gates (or rows).
Since a display (monitor) can be either monochrome or color. A monochrome display is essentially a transparent plate on which a transparent electrically conducting coating is deposited; i.e., the first coating appearing as parallel electrodes performing the function of cathode buses (columns), and the second coating appearing as parallel electrodes performing the function of grid buses (rows), and a phosphor layer. A color display on a transparent electrically conducting layer has green, red, and blue-emitting areas of the phosphor layer, which are brought in coincidence with the areas established by the places of crossover of the ribbon-type cathodes and gates. Both the display and the source of electrons are enclosed in common air-evacuated casing.
A 400 volt constant positive voltage is applied to the display with respect to the ribbon-type cathodes, while a 50 to 80 volt constant positive voltage is applied to the ribbon-type gates with respect to the ribbon-type cathodes. In a single element or pixel cell of such an arrangement, the operation proceeds in the following manner.
Due to a short spacing between the edge of a hole in the ribbon-type gate and the tip of a needle-type emitter (i.e., of the order of 0.4-0.5 .mu.m), a high-intensity (in excess of 10.sup.7 volts per centimeter or V/cm) electric field is established at the emitter tip, and field emission of electrons from the emitter tip begins. The emitted electrons come under the effect of the accelerating electric field of the display and, while flying towards the display, the electrons bombard the phosphor, thus causing it to luminesce.
Each element (pixel) located at the crossover of the ribbon-type gate and the ribbon-type cathode provides for glow of a dot on the display. Thus, a monochrome or color picture can be established on the display by consecutively activating the respective ribbon-type gates with respect to the respective ribbon-type cathodes with a definite switch-over time.
This type of cathodoluminescent display is characterized by high voltages (that is, 400-500V) applied to the display, which results in higher power consumption which affects the operating stability and dependability of the display. During operation under the bombarding effect of the ions of the residual gases, emitter tips change geometry and undergo an increased radius of curvature which results in the lower operating stability. Ionization activity of any residual gas may occur due to a high voltage (400-500V) applied to the display and an adequately large spacing (200 .mu.m) between the tips of the emitters and the display surface. Such an increase in the radius of curvature of the emitter tips decreases the intensity of the electric field at the tip
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Haynes Mack
Kypwee Display Corporation
O'shea Sandra
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