Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2000-08-07
2002-11-19
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S067000, C345S036000
Reexamination Certificate
active
06483491
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plasma display panel, and more particularly to a structure and driving method for a plasma display panel.
2. Discussion of the Related Art
Generally, a plasma display panel and a liquid crystal display (LCD) have lately attracted considerable attention as the most practical next generation display of flat panel displays. In particular, the plasma display panel has higher luminance and a wider viewing angle than the LCD. For this reason, the plasma display panel is widely used as a thin type large display such as an outdoor advertising tower, a wall TV and a theater display. The plasma display panel can be divided into a three-electrode type and a two-electrode type.
A related art plasma display panel of three-electrode area discharge type will be described with reference to the accompanying drawings.
As shown in
FIG. 1
a
, the related art plasma display panel of three-electrode area discharge type includes an upper substrate
10
and a lower substrate
20
which face each other. In
FIG. 1
b
, the lower substrate
20
is rotated by 90°.
The upper substrate
10
includes a plurality of scan electrodes
16
and
16
′, a plurality of sustain electrodes
17
and
17
′, a dielectric layer
11
, and a passivation film
12
. The scan electrodes
16
and
16
′ are formed at certain intervals in parallel to the sustain electrodes
17
and
17
′. The dielectric layer
11
is deposited on the scan electrodes
16
and
16
′ and the sustain electrodes
17
and
17
′.
The lower substrate
20
includes a plurality of address electrodes
22
, a dielectric film
21
formed on an entire surface of the substrate including the address electrodes
22
, a plurality of barriers
23
formed on the dielectric film
21
between the respective address electrodes, and a phosphor
24
formed on surfaces of the barriers
23
in each discharge cell and of the dielectric film
21
.
Inert gases such as He and Xe are mixed in a space between the upper substrate
10
and the lower substrate
20
at a pressure of 400 to 500 Torr. The space forms a discharge region.
The scan electrodes
16
and
16
′ and the sustain electrodes
17
and
17
′ are of transparent electrodes and bus electrodes of metals so as to increase optical transmitivity of each discharge cell, as shown in
FIGS. 2
a
and
2
b
. That is to say, the electrodes
16
and
17
are of transparent electrodes while the electrodes
16
′ and
17
′ are of bus electrodes.
FIG. 2
a
is a plane view of the sustain electrodes
17
and
17
′ and the scan electrodes
16
and
16
′, and
FIG. 2
b
is a sectional view of the sustain electrodes
17
and
17
′ and the scan electrodes
16
and
16
′.
A discharge voltage from an externally provided driving integrated circuit (IC) is applied to the bus electrodes
16
′ and
17
′. The discharge voltage applied to the bus electrodes
16
′ and
17
′ is applied to the transparent electrodes
16
and
17
to generate discharge between the adjacent transparent electrodes
16
and
17
. The transparent electrodes
16
and
17
have an overall width of about 300 &mgr;m and are made of indium oxide or tin oxide. The bus electrodes
16
′ and
17
′ are formed of a three-layered thin film of Cr—Cu—Cr. At this time, the bus electrodes
16
′ and
17
′ have a line width of ⅓ of a line width of the transparent electrodes
16
and
17
.
The operation of the aforementioned AC type plasma display panel of three-electrode area discharge type will be described with reference to
FIGS. 3
a
to
3
d.
If a driving voltage is applied between each address electrode and each scan electrode, opposite discharge occurs between the address electrode and the scan electrode as shown in
FIG. 3
a
. The inert gas injected into the discharge cell is instantaneously excited by the opposite discharge. If the inert gas is again transited to the ground state, ions are generated. The generated ions or some electrons of quasi-excited state come into collision with a surface of the passivation film as shown in
FIG. 3
b
. The collision of the electrons secondarily discharges electrons from the surface of the passivation film. The secondarily discharged electrons come into collision with a plasma gas to diffuse the discharge. If the opposite discharge between the address electrode and the scan electrode ends, wall charges having opposite polarities occur on the surface of the passivation film on the respective address electrode and the scan electrode, as shown in
FIG. 3
c.
If the discharge voltages having opposite polarities are continuously applied to the scan electrode and the sustain electrode and at the same time the driving voltage applied to the address electrode is cut off, area discharge occurs in a discharge region on the surfaces of the dielectric layer and the passivation film due to potential difference between the scan electrode and the sustain electrode as shown in
FIG. 3
d
. The electrons in the discharge cell come into collision with the inert gas in the discharge cell due to the opposite discharge and the area discharge. As a result, the inert gas in the discharge cell is excited and ultraviolet rays having a wavelength of 147 nm occur in the discharge cell. The ultraviolet rays come into collision with the phosphors surrounding the address electrode and the barrier so that the phosphors are excited. The excited phosphors generate visible light rays, and the visible light rays display an image on a screen. That is, the plasma display panel is operated.
A related art plasma display panel of two-electrode area discharge type will be described with reference to FIG.
4
.
Opposite discharge occurring between a pair of electrodes formed to face each other on facing substrates is controlled to display an image.
The plasma display panel of two-electrode area discharge type includes electrodes in a matrix arrangement. That is, this plasma display panel includes a plurality of cathodes
50
formed on a lower substrate, a plurality of display anode electrodes
60
formed on an upper substrate to be orthogonal to the cathode electrodes, and a plurality of auxiliary anode electrodes
70
.
The cathode electrodes
50
are separated from the anode electrodes
60
and
70
by barriers
23
. A space of a display charge cell
80
and a space of an auxiliary discharge cell
80
′ are respectively formed. A space having a certain area is formed between most of the barriers
23
and the upper substrate
10
and between most of the barriers
23
and the lower substrate
20
, so that a priming path is formed. The priming path induces auxiliary discharge generated by the auxiliary discharge cell
80
′ to the display discharge cell
80
.
The aforementioned plasma display panel adopts a pulse memory system. A method for driving the pulse memory system will now be described.
As shown in
FIG. 5
, a sustain discharge pulse
90
is always applied to the cathode electrodes and a scan pulse
95
is applied from the first cathode electrode to the next cathode electrode in turn. At this time, auxiliary discharge occurs whenever the scan pulse
95
′ is applied to the auxiliary discharge cell
80
′.
The discharge of the auxiliary discharge cell
80
′ is successively spread into an adjacent auxiliary discharge cell, thereby generating charge particles. The charge particles are spread into the adjacent display discharge cell
80
through the priming path. Thus, delay time required to discharge the display discharge cell is reduced.
A data pulse
93
is applied to the display anode electrode
60
when the scan pulse
95
is applied to the cathode electrode
50
. Since a discharge voltage of the display discharge cell
80
is lowered by the auxiliary discharge for generating display discharge, once addressed cell sustains discharge by applying the sustain discharge pulse
90
thereto.
However, the related art plasma display
Fleshner & Kim LLP
Hjerpe Richard
LG Electronics Inc.
Nguyen Kimnhung
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