Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Reexamination Certificate
2001-01-12
2003-08-26
Lee, Susan S. Y. (Department: 2852)
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
C313S293000, C313S302000
Reexamination Certificate
active
06611094
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a double-faced vacuum fluorescent display device and a method for driving same, wherein the device has a front plate, a back plate and an anode electrode containing a fluorescent layer formed thereon.
BACKGROUND OF THE INVENTION
A conventional double-faced vacuum fluorescent display device is normally provided with a front plate, a back plate, front anode electrodes formed on the front plate and back anode electrodes formed on the back plate, each anode electrode containing a fluorescent layer coated thereon, wherein a grid is installed corresponding to each anode electrode and a filament is tightly hanged between two grids facing each other.
FIG. 15A
shows a plan view of a conventional double-faced vacuum fluorescent display device
700
.
FIG. 15B
illustrates a cross sectional view of the conventional double-faced fluorescent display device
700
taken along X-X′of FIG.
15
A.
In
FIGS. 15A and 15B
, there are illustrated a front plate
71
of the fluorescent device
700
, a front anode electrode
72
formed on the front plate
71
and a grid
74
corresponding thereto installed facing the front anode electrode
72
, wherein a fluorescent layer
73
is coated on the front anode electrode
72
. Further, there are illustrated a back plate
75
of the fluorescent device
700
, a back anode electrode
76
formed on the back plate
75
and a grid
78
corresponding thereto installed facing the back anode electrode
76
, wherein a fluorescent layer
77
is coated on the back anode electrode
76
. A filament
79
is tightly hanged between the two grids
74
and
78
by two supporting members
80
and
80
′ disposed on the front plate
71
. The grids
74
and
78
control the electron emission from the filament
79
toward the front anode electrode
72
and the back anode electrode
76
facing each other, respectively.
Since, however, in the conventional double-faced vacuum fluorescent display device
700
, the grids
74
and
78
should be installed between the front anode electrode
72
and the back anode electrode
76
, the fluorescent display device
700
is expensive, structurally complex and it is especially difficult to manufacture a light and slim type one. Further, the manufacturing process of the fluorescent display device
700
may be accompanied by certain other defects. For example, the alignment of the grids with the anode electrodes is difficult; and there occurs considerable power consumption due to the use of the grids.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a simple and slim double-faced vacuum fluorescent display device whose power consumption and fabrication cost are low.
In accordance with a preferred embodiment of the present invention, there is provided a double-faced vacuum fluorescent display device including a front plate, a back plate and a filament installed between the front plate and the back plate facing each other,
characterized in that the front plate has one or more front anode electrodes and the back plate has one or more back anode electrodes, each anode electrode containing a fluorescent layer coated thereon; the front anode electrodes function as control electrodes to control the electron emission from the filament toward the back anode electrodes; and the back anode electrodes function as control electrodes to control the electron emission from the filament toward the front anode electrodes.
In accordance with another preferred embodiment of the present invention, there is provided a double-faced vacuum fluorescent display device including a front plate, a back plate and a filament installed between the front plate and the back plate facing each other,
characterized in that the front plate has one or more front anode electrodes and the back plate has one or more back anode electrodes, each anode electrode containing a fluorescent layer coated thereon; and when the front anode electrodes are selected to be turned on to emit light, the back anode electrodes function as control electrodes to control the electron emission from the filament toward the front anode electrodes; and when the back anode electrodes are selected to be turned on to emit light, the front anode electrodes function as control electrodes to control the electron emission from the filament toward the back anode electrodes.
REFERENCES:
patent: 5270613 (1993-12-01), Kim
patent: 5463276 (1995-10-01), Kawasaki et al.
patent: 6340865 (2002-01-01), Kawasaki et al.
patent: 2000-123765 (2000-04-01), None
Iidaka Yoshikazu
Ishikawa Kazuyoshi
Kawasaki Hiroaki
Kougo Katsutoshi
Ogawa Yukio
Futaba Denshi Kogyo Kabushiki Kaisha
Katten Muchin Zavis & Rosenman
Lee Susan S. Y.
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