Electric lamp and discharge devices – With gas or vapor – Three or more electrode discharge device
Reexamination Certificate
2000-05-17
2002-06-04
Kim, Robert H. (Department: 2882)
Electric lamp and discharge devices
With gas or vapor
Three or more electrode discharge device
C313S586000, C313S587000, C313S292000
Reexamination Certificate
active
06400081
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a surface discharge AC driving plasma display panel, and more particularly, to a structure for aligning the positions of the components of the plasma display panel upon its assembly.
In recent years, a surface discharge AC driving plasma display panel has drawn considerable attention as a color display device having a large area and a small thickness, and attempts have been made to popularize the device.
FIG. 6
is a plan view schematically showing the cell structure of a conventional surface discharge AC driving plasma display panel.
FIG. 7
is a cross-sectional view taken along the line V—V of FIG.
6
.
FIG. 8
is a cross-sectional view taken along the line W—W of FIG.
6
.
Referring to
FIGS. 6-8
, on the back surface of a front glass substrate
1
, which is a display surface of the plasma display panel, a plurality of row electrode pairs (X′, Y′), a dielectric layer
2
covering these row electrode pairs (X′, Y′), and a protection layer
3
made of MgO and covering the back surface of this dielectric layer
2
are provided in this order.
Each of the row electrodes X′, Y′ is composed of transparent electrodes Xa′, Ya′ made of a transparent conductive film, such as ITO, having a large width, and bus electrodes Xb′ Yb′ made of a metal film having a narrow width for compensating for the electric conductivity of the transparent electrode Xa′, Ya′.
These row electrodes X′ and Y′ are disposed alternately with a discharge gap g′ therebetween in the column direction, and each row electrode pair (X′, Y′) constitutes one line (row) L of the matrix display.
On a rear glass substrate
4
, which faces the front glass substrate
1
through a discharge space S′ filled with a discharge gas, a plurality of column electrodes D′ is arranged to extend in a direction perpendicular to the row electrode pairs X′, Y′. Belt-shape partitions
5
are formed between the column electrodes D′ so as to extend in parallel with each other. Fluorescent layers
6
of three colors, R, G, B, are formed to cover the side surfaces of the partitions
5
and the column electrodes D′.
Thus, the discharge space S′ is defined by the partitions
5
, and thereby discharge cells C′ constituting respective unit luminous regions are formed at intersections of the column electrodes D′ and the row electrode pairs (X′, Y′) in respective display line L.
The above-mentioned surface discharge AC driving plasma display panel displays images in the following manner. First, through addressing operation, electric discharges are selectively effectuated between the row electrode pairs (X′, Y′) and the column electrodes D′ at the respective discharge cells C′, thereby distributing lightening cells (discharge cells in which wall charges are formed in the corresponding dielectric layer
2
) and light-out cells (discharge cells in which wall charges are not formed in the corresponding dielectric layer
2
) on the panel in correspondence with an image to be displayed.
After this addressing operation, a discharge-maintaining pulse is applied alternately to the row electrode pairs (X′, Y′) for all the display lines L at once. Every time this discharge-maintaining pulse is applied, surface discharge is generated at the lightening cells.
This way, ultraviolet rays are generated at the lightening cells by surface discharge, and the fluorescent layers
6
of R, G, B in the discharge cells C′ are respectively excited to emit light, thereby forming the image to be displayed.
The plasma display panel having the above-mentioned structure is assembled by superimposing the front glass substrate
1
having the row electrodes X′, Y′, dielectric layer
2
, and protection layer
3
formed thereon onto the rear glass substrate
4
having the column electrodes D′, partitions
5
, and fluorescent layers
6
formed thereon.
At the time of this assembly, it is necessary to ascertain an offset between a pattern of the row electrodes X′, Y′ formed on the front glass substrate
1
and partitions
5
formed on the rear glass substrate
4
. This evaluation is performed by detecting the amount of a deviation of an alignment-use mark on the rear glass substrate
4
from the pattern of the row electrodes X′, Y′ (positional relationship between the row electrodes and the partitions) in the condition where the front glass substrate
1
is temporarily fixed to the rear glass substrate
4
by clips in advance of cementing these substrates together.
Such evaluation is necessary because the deviation (alignment error) between the front glass substrate
1
and the rear glass substrate
4
causes a degradation in the luminance and a decrease in the power margin. Once the deviation is detected, the deviation is eliminated by applying a counter-offset.
Here, in the conventional surface discharge AC driving plasma display panel described above, as shown in
FIG. 8
, the fluorescent layers
6
are formed even on the side surfaces of the belt-shape partitions
5
in order to increase the luminous areas in the discharge cells C′, thereby increasing the luminance of the display screen. Nonetheless, if the resolution of the screen is increased by reducing the size of each discharge cell C′, the surface areas of the fluorescent layers
6
are accordingly reduced, and the resultant luminance decreases, which is a drawback.
Furthermore, if the pitch of the row electrode pairs (X′, Y′) is narrowed to achieve a higher resolution of the screen, discharge interference occurs between the discharge cells C′ adjacent in the vertical direction, increasing a likelihood of misdischarge, which is another drawback.
In light of the above problems, the present applicant has previously proposed a novel surface discharge AC driving plasma display panel shown in
FIGS. 9-11
.
In this plasma display panel, a plurality of row electrode pairs (X, Y) is parallely arranged on the back surface of a front glass substrate
10
, which is the display face, in such a way as to extend in the row direction of the front glass substrate
10
(the right and left direction in FIG.
9
).
Each of the row electrodes X is composed of transparent electrodes Xa, each of which is formed to have the shape of the letter “T” and is made of a transparent conductive film, such as ITO, and a bus electrode Xb made of a metal film, which extends in the row direction of the front glass substrate
10
and is connected to the narrow base end part of each transparent electrode Xa.
Similarly, each of the row electrodes Y is composed of transparent electrodes Ya, each of which is formed to have the shape of the letter “T” and is made of a transparent conductive film, such as ITO, and a bus electrode Yb made of a metal film, which extends in the row direction of the front glass substrate
10
and is connected to the narrow base end part of each transparent electrode Ya.
These row electrodes X and Y are alternately arranged in the column direction of the front glass substrate
10
(the vertical direction in FIG.
9
). Each of the transparent electrodes Xa and Ya arranged along the respective bus electrodes Xb and Yb extends towards the corresponding paired row electrode so that the sides of the wider parts of the paired transparent electrodes Xa and Ya face each other through a discharge gap g having a predetermined distance.
Each of the bus electrodes Xb, Yb is formed of a black conductive layer Xb′, Yb′ on the display surface side and a primary conductive layer Xb″, Yb″ on the back side in a double-layered structure.
A black light absorption layer
17
is formed on the back surface of the front glass substrate
10
between the row electrode pairs (X, Y) adjacent in the column direction i.e., between the bus electrode Xb and the-bus electrode Yb.
Further, a dielectric layer
11
Matsumoto Tetsuya
Nakano Takashi
Arent Fox Kintner & Plotkin & Kahn, PLLC
Pioneer Corporation
Yun Jurie
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