Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2000-02-25
2002-04-16
Mengistu, Amare (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S067000
Reexamination Certificate
active
06373451
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for driving an AC surface discharge plasma display panel according to an electrode wiring structure.
2. Description of the Related Art
A plasma display panel is a kind of a display for restoring picture data input as an electrical signal by arranging a plurality of discharge tubes in a matrix shape and selectively emitting light from the plurality of discharge tubes. A method for driving the plasma display panel is divided into a DC driving method and an AC driving method according to whether the polarity of a pulse voltage applied in order to maintain the discharge changes as time passes.
FIG. 1
is a sectional view of an opposite orientation discharge structure plasma display panel.
FIGS. 2A and 2B
are respectively a sectional view and an exploded perspective view of the AC surface discharge structure plasma display panel. As shown in
FIGS. 1
,
2
A, and
2
B, a discharge space is formed between upper glass substrates
1
and
7
and lower glass substrates
4
and
12
in the DC opposite orientation discharge structure plasma display panel and the AC surface discharge structure plasma display panel, respectively. Meanwhile, in the DC plasma display panel, the flow of electrons supplied from a negative polarity is a main source of energy for maintaining the discharge since a scanning electrode
2
and an address electrode
5
are directly exposed to a discharge space
3
, in the AC plasma display panel, a scanning electrode
6
a
and a common electrode
6
b
for maintaining the discharge are electrically isolated from a discharge space
10
since the scanning electrode
6
a
and the common electrode
6
b
are in a dielectric layer
8
. The discharge is maintained by a well-known wall charge effect in the case of the AC type plasma display panel. Namely, since a discharge starting voltage is an addition of a voltage generated by a wall charge to an applied voltage, discharge occurs only where the wall charge exists. Since the discharge accumulates wall charges, the discharge is maintained in a place where the discharge once occurred.
Also, the plasma display panel is divided into an opposite orientation discharge structure and a surface discharge structure according to the arrangement of the electrodes for generating the discharge. Namely, in the opposite orientation discharge structure, the electrodes for generating the discharge are arranged on different surfaces, i.e., opposite surfaces as shown in FIG.
1
. In the surface discharge structure, the electrodes for generating the discharge are arranged on the same surface as shown in FIG.
2
A. The respective structures are divided into a two electrode structure and a three electrode structure, etc., according to the number of electrodes installed in order to easily realize a discharge.
FIG. 2B
shows a three electrode surface discharge structure of the plasma display panel which is commonly used. An address electrode
11
which faces the scanning electrode
6
a
and the common electrode
6
b
which are two display electrodes formed side by side is installed in the discharge space formed by a partition wall. The discharge for generating the wall charge in order to select pixels occurs between the address electrode
11
and the scanning electrode
6
a
. Then, the discharge for displaying a picture is repeated for a predetermined time between the scanning electrode
6
a
and the common electrode
6
b
. A partition wall
17
forms the discharge space and intercepts light generated during the discharge, thus preventing generation of cross talk in adjacent pixels. Each pixel is formed by forming such unit-structure on a substrate and coating fluorescent material on the respective unit structures. These pixels are integrated in a matrix and become a plasma display panel. In the commonly used plasma display panel, the discharge occurs in the respective pixels and ultraviolet rays generated by the discharge excite the fluorescent material coated on the inner wall of the pixel, thus realizing a desired color.
In order for the plasma display panel to exhibit the function of the display panel, gray scales must be realized. In order to realize the gray scales in the plasma display panel, a time division controlling method for dividing one TV field into a plurality of auxiliary fields and displaying the auxiliary fields is used.
FIG. 3
is a diagram for describing the gray scale displaying method of the AC type plasma display panel which is currently applied to products. The method is a 6-bit gray scale displaying method, where one TV field is divided into
6
auxiliary fields. Each auxiliary field is divided into address periods A
1
, A
2
, . . . , and A
6
and sustaining periods S
1
S
2
, S
3
, . . . , and S
6
. The pixel of the display panel is selected during the address periods A
1
, A
2
, . . . , and A
6
. The gray scales of the pixel selected during the address periods are displayed during the following sustaining periods S
1
, S
2
, S
3
, . . . , and S
6
. Accordingly, the gray scales of the pixels are displayed by the combination of the sustaining periods S
1
, S
2
, S
3
, . . . , and S
6
selected by addressing. It is possible to display 64 (=2
6
) gray scales by this method. Namely, the pixels selected from the plasma display panel comprised of 480 scan lines Y
1
, Y
2
, . . . , and Y
480
can display a total of 64 levels, i.e., from level 0 to level 63. For example, the gray scales are displayed as follows, 0(0T), 1(1T), 2(2T), 3(1T+2T), 4(4T), 5(1T+4T), 6(2T+4T), 7(1T+2T+4T), 8(8T), 9(1T+8T), . . . , 27(1T+2T+8T+16T), . . . , 63(1T+2T+4T+8T+16T+32T).
FIG. 4
shows an example of the electrode wiring structure of the commonly used AC type plasma display panel, which is constituted of two electrode pairs (X and Y electrode pairs) which face each other and are parallel to each other in a horizontal direction and address electrodes
21
which are vertical to the X and Y electrode pairs. Here, electrodes which are commonly wired among the two horizontal electrode pairs are common electrodes (X electrodes). The other electrodes are scanning electrodes (Y electrodes). The waveform of a driving signal for driving the AC plasma display panel having such a wiring structure is shown in FIG.
5
. The driving signal is used for an address division sustain (ADS) method for separately driving an address discharge and a sustaining discharge. In
FIG. 5
, the waveforms of the address electrode driving signal A, scanning electrode driving signals Y
1
, Y
2
, . . . , Y
480
, and a common electrode driving signal are shown. Here, only the signal of a first sub field SF
1
is shown. A
1
shows a first address period. S
1
shows a first sustaining period. An address period (the first address period) is comprised of an erase time of an entire erase period A
11
, an entire write period A
12
, and an entire erase period A
13
and a real address period A
14
for actually selecting the pixels. During the erase period A
11
, a wall charge due to a previous discharge is entirely erased. During the period A
12
, a new wall charge is entirely written by generating weak discharge for correctly displaying gray scales. During the erase period A
13
, the written wall charge is entirely erased and the amount of wall charge is appropriately controlled and an appropriate amount is left, thus making the operation of a next auxiliary field harmonious. During the address period (A
14
), a wall charge is written in the scanning electrode of a selected pixel of the entire screen of the plasma display panel by selective discharge caused by a write pulse between the address electrode and the scanning electrode, which cross each other. The write pulse is an electrical signal into which image information is converted. During the discharge maintaining period (S
1
), light emission is maintained, namely, image information is realized on a real screen as real gray scales by the discharge caused by con
Eo Yoon-phil
Kang Kyoung-ho
Ryeom Jeong-duk
Lowe Hauptman & Gilman & Berner LLP
Mengistu Amare
Samsung SDI & Co., Ltd.
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