Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Reexamination Certificate
2000-01-14
2002-10-22
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
C313S304000, C313S495000, C313S239000, C445S024000
Reexamination Certificate
active
06469436
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to semiconductor integrated circuits. More particularly, it pertains to systems, structures, and methods to shield a field emitter device from radiation.
BACKGROUND OF THE INVENTION
Interest in field emitter displays is on the rise. This is attributable to the fact that such displays can fulfill the goal of being consumer-affordable hang-on-the-wall flat panel television displays with diagonals in the range of 20 to 60 inches. Certain field emitter displays operate on the same physical principles as cathode ray tube (CRT) based displays. The field emitter releases electrons responsive to the presence of an electromagnetic field. These excited electrons are guided to a phosphor target to create a display. The phosphor then emits photons in the visible spectrum.
The excited electrons also emit photons upon striking the phosphor target. Some of these photons include high-energy radiation phenomena beyond the visible spectrum. Radiation of this kind tends to damage structural materials and diminish the performance of electrical materials, such as semiconductor-based field emitter displays.
To protect field emitter displays from high-energy radiation, tungsten has been used to absorb such radiation. However, field emitter displays that are protected by tungsten continue to experience deterioration. It seems tungsten has added a number of problems of its own. Most of the problems tend toward reliability issues, such as electromigration. These problems suggest that tungsten might be causing deleterious effects upon the physical structure of the field emitter display. Such issues raise questions about the commercial success of the displays in the marketplace.
Thus, what is needed are systems, structures, and methods to block radiation while inhibiting the deterioration of field emitter displays.
SUMMARY OF THE INVENTION
The above mentioned problems with field emitter displays and other problems are addressed by the present invention and will be understood by reading and studying the following specification. Structures and methods are described which accord these benefits.
One illustrative embodiment of the present invention includes a field emitter display device. This device has at least one emitter to emit electrons at a desired level of energy, and a shielding layer. The shielding layer inhibits radiation degradation of the at least one emitter. The emitter maintains structural stability in the presence of the shielding layer.
In another illustrative embodiment, a method of forming a field emission device is described. The method includes forming a cathode emitter tip on a substrate, forming an extraction grid, forming a dielectric layer, and forming an opaque layer having a thickness of about 0.5 micron to about 1.0 micron.
These and other embodiments, aspects, advantages, and features of the present invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art by reference to the following description of the invention and referenced drawings or by practice of the invention.
REFERENCES:
patent: 5186670 (1993-02-01), Doan, et al.
patent: 5229331 (1993-07-01), Doan et al.
patent: 5259799 (1993-11-01), Doan et al.
patent: 5372973 (1994-12-01), Doan et al.
patent: 5653619 (1997-08-01), Cloud et al.
Rolfson J. Brett
Williams Terry N.
Micro)n Technology, Inc.
Patel Vip
Schwegman Lundberg Woessner & Kluth P.A.
Williams Joseph
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