Plasma display panel with optical shutter

Details Plasma display panel with optical shutter Plasma display panel with optical shutter

1999-07-02

2001-11-20

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Three or more electrode discharge device

C313S586000

Reexamination Certificate

active

06320313

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a flat panel display device, and more particularly to a plasma display panel having a bilateral display function that is adaptive for displaying a picture in two directions and a driving apparatus thereof.
2. Description of the Related Art
Generally, a plasma display panel(PDP) radiates a fluorescent body by an ultraviolet with a wavelength of 147 nm generated during a discharge of He+Xe or Ne+Xe gas to thereby display a picture including characters and graphics. Such a PDP permits it to be easily made into a thin film and large-dimension type. Moreover, the PDP provides a very improved picture quality owing to a recent technical development. The PDP can be classified into an alternating current (AC) driving system making a surface discharge and a direct current (DC) driving system in accordance with its driving system.
Referring to
FIG. 1
, there is shown a PDP driving apparatus of AC system that includes a PDP
10
having a pixel matrix consisting of mxn discharge cells
1
. In the PDP
10
, m scanning/sustaining electrode lines Y
1
to Ym, hereinafter referred to as “Y electrode lines”, and m common sustaining electrode lines Z
1
to Zm, hereinafter referred to as “Z electrode lines”, are alternately formed, in parallel, on an upper glass substrate(not shown). Also, n address electrode lines X
1
to Xn, hereinafter referred to as “X electrode line”, are formed on a lower substrate(not shown) in a direction perpendicular to the Y electrode lines Y
1
to Ym and the Z electrode lines Z
1
to Zm. Each of the mxn discharge cells
1
is arranged in a matrix pattern at intersections among the Y electrode lines Y
1
to Ym, the Z electrode lines Z
1
to Zm and the address electrode lines X
1
to Xn. A barrier rib(not shown) is formed on the lower substrate in parallel with X electrode lines X
1
to Xn to divide the discharge cells
1
arranged at the vertical direction.
Further, the PDP driving apparatus of AC driving system includes first and second address drivers
6
A and
6
B connected to the X electrode lines X
1
to Xn of the PDP
10
, a scanning/sustaining driver
2
connected to the Y electrode lines Y
1
to Ym of the PDP
10
, and a common sustaining driver
4
connected to the Z electrode lines Z
1
to Zm of the PDP
10
. The first address driver
6
A is connected to odd-numbered address electrode lines X
1
, X
3
, . . . , Xn−3, Xn−1 and the second address driver
6
B is connected to even-numbered X electrodes X
2
, X
4
, . . . , Xn−2, Xn to apply a video data to each X electrode line X
1
to Xn. The scanning/sustaining driver
2
is connected to m Y electrode lines Y
1
to Ym to select a scanning line to be displayed and to cause a sustaining discharge at the displayed scanning line. The common sustaining driver
4
is commonly connected to m Z sustaining electrode lines Z
1
to Zm to apply an identical waveform of voltage signal to all the Z electrode lines Z
1
to Zm, thereby causing a sustaining discharge.
In such a PDP, one frame consists of a number of sub-fields, and a gray level is realized by a combination of the sub-fields. For instance, when it is intended to realize 256 gray levels, one frame interval is time-divided into 8 sub-fields. Further, each of the 8 sub-fields is again divided into an address interval and a sustaining interval. A discharge initiated at each of the discharge cells selected in the address interval is sustained during the sustaining interval. The sustaining interval is lengthened by an interval corresponding to 2
n
depending on a weighting value of each sub-field. In other words, the sustaining interval involved in each of first to eighth sub-fields increases at a ratio of 2
0
, 2
1
, 2
3
, 2
4
, 2
5
, 2
6
and 2
7
. To this end, the number of sustaining pulses generated in the sustaining interval also increases into 2
0
, 2
1
, 2
3
, 2
4
, 2
5
, 2
6
and 2
7
depending on the sub-fields. The brightness and the chrominance of a displayed image are determined in accordance with a combination of the sub-fields.
Since such a PDP has a wide view angle and favorable to making a large-scale screen, it can be used for a wall tapestry television as well as an advertising display device. In order to apply a PDP to the advertising display device, it is required to maximize an advertisement effect such as a double-faced display function and to improve the brightness.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a PDP with a bilateral display function that is suitable for displaying a picture in two directions, and a driving apparatus thereof.
Further object of the present invention is to provide a PDP with a bilateral display function that is capable of improving the brightness, and a driving apparatus thereof.
In order to achieve these and other objects of the invention, a plasma display panel with a bilateral display function according to one aspect of the present invention includes a first plasma display panel for displaying a picture by a discharge; a second plasma display panel, being installed in such a manner that its display face is opposed to that of the first plasma display panel for displaying a picture by a discharge; and an optical shutter member, being installed between the first and second plasma display panels, for transmitting or shutting off lights incident thereto from the first and second plasma display panels.
A driving apparatus for a plasma display panel with a bilateral display function according to another aspect of the present invention includes a display panel in which with an optical shutter member is installed between first and second plasma display panels for displaying a picture by a discharge; a memory controller for applying an input video signal for each of the first and second plasma display panels; panel driving means for driving the first and second display panels; optical shutter driving means for driving the optical shutter member; and control means for controlling the optical shutter driving means and the panel driving means.


REFERENCES:
patent: 0 261 584 (1988-03-01), None

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