Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-04-28
2001-06-12
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C313S309000
Reexamination Certificate
active
06246177
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the area of methods for operating field emission displays and, more particularly, to methods for providing “invisible” spacers within a field emission display.
BACKGROUND OF THE INVENTION
It is known in the art to use dielectric spacer structures to maintain the separation distance between a cathode plate and an anode plate of a field emission display. It is also known that the dielectric spacer structures can become positively charged during the operation of the device. By diverting electrons away from cathodoluminescent phosphors that are proximate to the charged spacer structures, the charged spacer structures can cause gaps in the display image at the locations of the charged spacer structures. In this manner, the spacer structures become “visible” or discernible to the viewer.
Thus, it is known to be desirable to neutralize the electrical charge that accumulates on the spacer structures. It is known to achieve spacer invisibility by reducing the voltage at the anode plate to ground potential during an electron emission, and thereby direct the electrons toward charged surfaces within the display, including the charged surfaces of the spacer structures. Although this scheme achieves “invisibility” of the spacers, it can further result in undesirable effects, such as those due to electron bombardment of the cathode plate.
Accordingly, there exists a need for an improved method for operating a field emission display, which achieves “invisibility” of the spacer structures while reducing electron bombardment of the cathode plate.
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Jaskie James E.
Rumbaugh Robert C.
Xie Chenggang
Klekotka James E.
Motorola Inc.
Philogene Haissa
Wills Kevin D.
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