Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
1999-12-16
2001-03-27
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C345S060000, C345S055000, C345S214000
Reexamination Certificate
active
06208082
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for driving a surface discharge type plasma display panel (PDP) having a matrix display form.
2. Description of the Related Art
FIGS. 1A and 1B
show the structures of conventional surface discharge type PDPs.
FIG. 1A
is a cross sectional view taken in a direction parallel to address electrodes, for illustrating the position where a discharge space is formed according to the arrangement of discharge sustaining electrodes. As shown in the drawing, the conventional surface discharge type PDP is constructed such that a front substrate
1
and a rear substrate
2
are disposed at a predetermined distance to be opposed to each other, and address electrodes
4
and discharge sustaining electrodes
3
are arranged on the opposing surfaces to intersect each other. Here, the discharge sustaining electrodes are arranged such that a common electrode (X) and a scanning electrode (Y) are paired and a black stripe
6
for shielding light is interposed therebetween. A discharge space
5
is formed between each pair of discharge sustaining electrodes, that is, between the common electrode (X) and the scanning electrode (Y). A region where the black stripe
6
is disposed is a non-discharge region
7
.
FIG. 1B
is a plan view showing the structure of discharge sustaining electrodes of another conventional PDP, applied to 50″ PDP products manufactured by Pioneer Electronic Corporation. The discharge sustaining electrodes of another conventional PDP shown in
FIG. 1B
are constructed such that a pair of a scanning electrode (Y-electrode) and a common electrode (X-electrode) are arranged for each line of a discharge cell in a direction intersecting a partition
53
. The scanning electrode and common electrode pair is constructed such that a T-shaped transparent electrode
52
is connected to a bus line
51
. In order to reduce a non-discharge region
54
formed in a gap between two adjacent discharge cells, the electrodes are arranged in order, that is, (X, Y
1
) (Y
2
, X)(X, Y
3
) (Y
4
, X
1
)(X . . . . However, the non-discharge region
54
cannot be completely removed. In order to avoid an erroneous discharge, a dielectric layer (not shown) may be further formed on the non-discharge region
54
between bus lines, which makes the manufacturing process complex and wastes a light-emission region, lowering the luminance.
In the above-described conventional PDP, there is one scanning electrode for each line of a discharge cell. Thus, as many scanning drivers as vertical lines of a display format, that is, the total number of scanning electrodes, are necessary. For example, 480, 768 and 1080 scanning drivers are required for a VGA (Video Graphic Array) PDP, an XGA (Extended Graphic Array) PDP and a HD (High Definition) PDP, respectively. That is to say, a large number of driving chips are necessary for driving electrodes.
In the surface discharge type PDPs having the above-described configurations, as shown in
FIG. 2
, an address electrode and a common electrode are selected and then an address voltage is applied therebetween to form wall charges on a discharge cell corresponding to a particular pixel, and a sustained discharge is made to occur only at the discharge cells where wall charges have been formed when a common discharge sustaining pulse is applied to the discharge sustaining electrodes, thereby displaying a picture of each field. Thus, a picture is divided into fields divided in a time-division manner to then be displayed in a time-sequence basis. According to this driving method, since the non-discharge region where the black stripe
6
is formed occupies a considerable amount of space, the overall luminance is poor and the resolution is deteriorated.
FIG. 3
is a cross-sectional view of a PDP employing an alternative lighting surfaces (ALiS) method in which a non-discharge region is removed from the above-described conventional surface discharge PDP. As shown in
FIG. 3
, in the ALiS-driven PDP, a front substrate
100
and a rear substrate
200
are disposed opposite to each other, and address electrodes
400
and discharge sustaining electrodes
300
are arranged on opposite surfaces to intersect each other, which is the same as the above-described PDP. However, a black matrix for shielding light is not arranged between the pairs of discharge sustaining electrodes
300
so that the discharge sustaining electrodes
300
are arranged in a stripe pattern at a constant interval. In other words, each common electrode (X) or scanning electrode (Y) is shared by two adjacent discharge cells. Thus, since the electrode arrangement density for a given area can be increased, the resolution of a picture can be enhanced. Also, since the non-discharge region is removed, the luminance is increased.
FIG. 4
illustrates a method for driving the surface discharge PDP employing an ALiS method. As shown in the drawing, according to the ALiS method developed by Fujitsu Limited, there is no non-discharge region and discharge spaces (
500
of
FIG. 3
) are secured at all discharge sustaining electrodes (
300
of
FIG. 3
) to cause a discharge, which is used in displaying a screen. In particular, this driving method is suitable for an analog broadcasting method such as Hi-vision broadcasting and is realized by interlaced scanning, as shown in FIG.
4
. In other words, in driving discharge sustaining electrode pairs for displaying a picture of one frame, for odd-numbered discharge lines, a discharge is caused in the first field to form a pixel, and for even-numbered discharge lines, a discharge is caused in the second field to form a pixel. Here, the term “discharge line” refers to a set of discharge cells driven by arbitrary neighboring pairs of X and Y electrodes. Thus, in applying this driving method to a digital television broadcasting system, the method is applicable only to high-definition (HD) systems of 1080I (Here, the character I denotes interlaced scanning.) but is not applicable to 720P or 1080P systems (Here, the character P denotes progressive scanning.).
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a method for driving a surface discharge type plasma display panel (PDP), by which the surface discharge type PDP which is simplified by removing a non-discharge region can be driven by a progressive scanning method rather than an interlaced scanning method.
Accordingly, to achieve the above objective, there is provided a method for driving an alternating-current (AC) type surface discharge plasma display panel (PDP) having two substrate to be opposed to each other, address electrodes arranged on the opposing surface of one of two substrates in a stripe pattern, and discharge sustaining electrodes on the opposing surface of the other substrate in a stripe pattern to intersect the data electrodes, wherein assuming that common electrodes of odd-numbered lines are denoted by Xa, common electrodes of even 5 numbered lines are denoted by Xb, and an nth scanning electrode is denoted by Yn, where n=1, 2, 3, . . . , the common electrodes and the scanning electrodes are arranged in the order Xa-Y
1
-Xb-Y
2
-Xa-Y
3
-Xb-Y
4
- . . . so that discharge cells of 2n lines are formed by (2n+1) discharge sustaining electrodes, the method including the steps of: in an addressing period in which an address pulse is applied to the addressing electrodes, sequentially applying to the Y electrodes a pulse for addressing, having the opposite polarity to that of the address pulse, in a period corresponding to the address pulse of the addressing electrodes, and a pulse for an auxiliary discharge, having the opposite polarity to that of the pulse for addressing, in a preceding period of the period corresponding to the address pulse of the addressing electrodes, the pulse for an auxiliary discharge and the pulse for addressing being applied twice for each Y electrode; and independently coupling Xa electrodes and Xb electrodes in pairs, and applying to
Heo Eun-gi
Kim Sang-Chul
Leydig , Voit & Mayer, Ltd.
Samsung SDI & Co., Ltd.
Vo Tuyet T.
Wong Don
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