JPH05342992A - Plane discharge type plasma display panel - Google Patents

Abstract

PURPOSE:To position a substrate easily at the time of assembly of a plane discharge type display panel which carries out matrix display in varieties of colors by phosphor and has three electrode structure. CONSTITUTION:A plane discharge type plasma display panel is composed while diaphragms 19, 29 which have a belt-like plane shape and partition a discharge space into sections of a light emitting region unit EU in the extended direction of the display electrodes X, Y are set in each of inner faces of a pair of substrates 11, 12 in the back side and in a display plane H side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge type plasma display panel (PDP) having a three-electrode structure for performing matrix display of various colors by using phosphors.

Since PDPs can display images at a higher speed than liquid crystal panels, they are expected to make progress in the field of high-definition television, for example. With this,
There is a demand for higher definition of PDP.

[0003]

2. Description of the Related Art In a PDP, a pair of glass substrates on a display surface side and a back surface side are arranged to face each other, and the peripheral portions of the facing regions of these glass substrates are sealed, so that 60 to 150 inside.
The display device has a discharge space formed of a gap of about μm.

The matrix display type PDP displays arbitrary characters and figures by selectively emitting light in a unit light emitting region defined at the intersection of grid-like electrode groups. Usually, the display area (area where the unit light emitting area is defined) is provided so as to avoid the vicinity of the sealing portion where discharge becomes unstable due to gas release of the sealing material.

Among this type of PDP, a surface discharge type PDP having a three-electrode structure suitable for color display by a phosphor is a pair of display electrodes (main electrodes for surface discharge) which are adjacent to each other in parallel.
And a plurality of address electrodes that are orthogonal to each electrode pair.

FIG. 6 is an exploded perspective view showing a sectional structure of a portion corresponding to one unit light emitting region EU of the conventional surface discharge type PDP 1j. In the figure, the unit light emitting region EU on the inner surface of the glass substrate 11 (the surface on which the display electrodes X and Y are formed)
Is indicated by a chain double-dashed line.

In the PDP 1j, a pair of display electrodes X and Y corresponding to one line of display are arranged on the inner surface of the glass substrate 11 on the display surface H side among the glass substrates 11 and 21 that sandwich the discharge space 30. There is.

The display electrodes X and Y are covered with a dielectric layer 17 for AC driving, and on the dielectric layer 17, partition walls having a grid-like planar shape partitioning the discharge space 30 into unit light emitting regions EU. 19W is provided. When performing multicolor or color display, one pixel (dot) for display is formed by a plurality of unit light emitting areas EU.

Each of the display electrodes X and Y has a wide band-shaped transparent conductive film (a NES film or the like) 41 and a narrow band-shaped metal film (Cr-Cu) stacked to compensate for the conductivity.
-Cr, etc.) 42. That is, the display electrodes X and Y
Is configured to minimize shading.

The surface of the dielectric layer 17 has a partition wall 19W.
At the same time, it is covered with a protective film (not shown) made of MgO having a large secondary electron emission coefficient. This protective film is
In addition to suppressing the deterioration of the dielectric layer 17 due to ion bombardment at the time of discharge, it has the effect of lowering the discharge start voltage.

On the other hand, on the inner surface of the glass substrate 21 on the back side, strip-shaped barrier ribs 29 that define the discharge space 30 together with the barrier ribs 19W and define the gap size thereof, and the unit light emitting region E are provided.
An address electrode A for selectively causing U to emit light and a phosphor 28 of a predetermined emission color are provided.

The address electrode A is arranged so as to be close to one end side of the unit light emitting region EU, that is, adjacent to one of the partitions 29 on both sides of the unit light emitting region EU, and the phosphor 2
8 is disposed on the surface of the glass substrate 21 between the address electrode A and the other partition 29.

For display, for example, display electrodes X and Y
A drive voltage exceeding the discharge start voltage is applied to. As a result, a surface discharge in the surface direction of the dielectric layer 17 occurs and the dielectric layer 1
The surface discharge is stopped when a predetermined amount of wall charges is accumulated in 7. After that, a surface discharge occurs every time a discharge sustaining voltage (display pulse) having a polarity opposite to the wall charges is alternately applied to the display electrodes X and Y, and the ultraviolet light generated at this time excites the phosphor 28 to emit light.

When the unit light emitting area EU is not made to emit light, the address voltage (erase pulse) is applied to the address electrode A at a predetermined time in synchronization with the discharge sustaining voltage.
Is applied. As a result, the wall charges disappear and no surface discharge occurs thereafter.

[0015]

The PDP 1 having the above structure
In j, when the glass substrates 11 and 21 are separately provided with predetermined constituent elements and then these glass substrates 11 and 21 are arranged to face each other, the partition walls 19W are in a lattice shape, and therefore, in the vertical and horizontal directions. High accuracy is required for alignment in the two directions. Especially, the pitch of the unit light emitting area EU is 0.5 mm
In the case of smaller high definition, there was a problem that alignment was extremely difficult.

In view of such problems, it is an object of the present invention to facilitate the alignment of the boards at the time of assembly.

[0017]

[Means for Solving the Problems] P according to the invention of claim 1
In order to solve the above-mentioned problems, the DP is a surface discharge type plasma display panel 1 or 2 having a three-electrode structure, as shown in FIG. 1, and a pair of substrates 1 on the display surface side and the back surface side.
Partition walls 19, 29B, 29, 19B having a planar shape that partition the discharge space into the unit light emitting regions EU in the extension direction of the display electrodes X, Y are provided on the inner surfaces of the reference electrodes 1, 21, respectively.

A PDP according to a second aspect of the present invention extends on the inner surface of at least one of the substrates 21 and 11 outside the display area EH in a direction intersecting with the partition walls 29 and 19B, and the other substrate 11 , 21 on the partition walls 19, 29
In the PDP according to the invention of claim 3, which has wall bodies 51 and 52 that come into contact with B, the wall body 51 and the partition wall 29 are made of a photosensitive thick film material and integrally formed by patterning. ..

In the PDP according to the invention of claim 4, the partition wall 29 on the rear surface side substrate 21 is provided higher than the partition wall 19 on the display surface side substrate 11, and the partition wall 29 is The side surface is covered with the phosphor 28.

In the PDP according to a fifth aspect of the present invention, the partition wall 19B on the rear-side substrate 21 is provided higher than the partition wall 29B on the display surface-side substrate 11, and the partition wall 19B is The surface is covered with a protective film 18.

In the PDP according to the sixth aspect of the present invention, the partition walls 29B and 19B are bonded by the bonding material 60 over the entire surfaces facing each other. In the PDP according to the invention of claim 7, the partition walls 29B, 19B are made of low melting point glass, and the bonding material 60 is made of crystallized glass having a lower softening point than the low melting point glass of the partition material.

[0022]

In the assembly of the surface discharge type plasma display panels 1 and 2, the pair of substrates 1 are arranged so that the partition walls 19 and 29B on the display surface side and the partition walls 29 and 19B on the back surface side are overlapped.
When arranging 1, 21, since the planar shape of these partition walls is a strip shape extending in the arrangement direction (vertical direction) of the display electrodes X and Y, the partition wall pitch is set in the extending direction (horizontal direction) of the display electrodes X and Y. Although high-precision (micrometer-order) alignment that depends on is required, high-precision alignment becomes unnecessary in the vertical direction.

Partition walls 19, 29B and partition walls 29, 19B
Abut on each other in the form of line contact at their tops. However, the partition walls 29 and 19B are wall bodies 5 extending in a direction intersecting with the partition walls 29 and 19B.
1, 52, so that the gap size of the discharge space is regulated to a predetermined value (the sum of the heights of the barrier ribs on the display surface side and the rear surface side) even if the positional deviation in the lateral direction occurs between the substrates. ..

The wall 51 and the partition wall 29 integrally formed by patterning using a photosensitive thick film material have uniform heights, so that the gap size of the discharge space is uniform over the entire display area EH. Become.

By providing the partition wall 29 on the back side high and providing the phosphor 28 on the side surface thereof, the area where the phosphor 28 is formed (that is, the light emitting area) becomes large, and a display screen with high brightness and a wide viewing angle can be obtained. ..

When the phosphor 28 is arranged on the display surface H side, the partition wall 19B on the side where the display electrodes X and Y are arranged (that is, the rear surface side) is provided high and the surface thereof is the protective film 18.
By coating with, the change in the composition of the discharge gas due to the gas release of the partition walls is suppressed, and stable discharge characteristics can be obtained for a long period of time.

By joining the barrier ribs 29B and 19B using the bonding material 60, even if the heights of the barrier ribs 29B and 19B are not uniform, voids do not occur between the barrier ribs, so that the discharge is localized (discharging). Unnecessary spread suppression) is optimized, display disturbance is prevented, and the drive margin is expanded.

[0028]

1 is a plan view showing the structure of the main part of a PDP 1 according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG.
1 is a perspective view showing the partition structure of the PDP 1 of FIG. 1, and FIG.
FIG. 3 is an exploded perspective view showing a sectional structure of a portion corresponding to one unit light emitting region EU of PDP 1. In these drawings, the components corresponding to those in FIG. 6 are denoted by the same reference numerals regardless of the difference in shape, material, and arrangement relationship, and the description thereof will be omitted or simplified.

As shown in FIG. 4, the PDP 1 is
The surface discharge type PDP has a three-electrode structure in which a pair of display electrodes X and Y and an address electrode A correspond to each other in the unit light emitting region EU, and is called a reflection type in view of the arrangement form of the phosphor.

The display electrodes X and Y are composed of a strip-shaped transparent conductive film 41 and a strip-shaped metal film 42, respectively, and are arranged on the inner surface of the glass substrate 11 on the display surface H side. On the dielectric layer 17 covering these display electrodes X and Y, the display electrodes X and
A partition wall 19 having a strip-like planar shape extending in a direction orthogonal to Y is provided. The surface of the dielectric layer 17 is covered with a Mg0 film (protective film) (not shown) at a stage after the partition wall 19 is provided.

In order to prevent discharge interference (combining discharges) between lines, the sum of the widths of the display electrodes X and Y and the discharge gap (width of the electrode pair) is determined by the line pitch (of the unit light emitting area EU). The length is selected to be about 0.7 times the vertical length.

On the other hand, the glass substrate 21 on the back side is provided with strip-shaped partition walls 29 extending in the same direction as the partition walls 19 and in contact with each other. Address electrodes A having a predetermined width by firing are arranged.

The fluorescent substance 28 is provided so as to completely cover the inner surface of the glass substrate 21 except for the top of the partition 29 and its vicinity. That is, in the PDP 1, the phosphor 28 is provided on almost the entire surface of the wall surface of the discharge space 30 on the glass substrate 21 side in the unit light emitting region EU, including the side surface of the partition wall 29 and the surface of the address electrode A. ..

The discharge space 30 is divided by the partition walls 19 and 29 on the display surface H side and the back surface side into unit emission regions EU in the extending direction (horizontal direction) of the display electrodes X and Y, and the gap dimension thereof is set. 130 μ, which is the sum of the heights of the partition walls 19 and 29
It is regulated to a value of about m.

However, as described above, the partition walls 19 and 29 are strip-shaped (width is, for example, about 60 μm) in plan view, and abut on each other in line contact. Therefore, when the glass substrates 11 and 21 are displaced in the lateral direction in the sealing process or the like, the upper glass substrate 11 may slide down and the gap size of the discharge space 30 may become inappropriate.

Therefore, in the PDP 1 of this embodiment, as shown in FIG.
As shown in FIG. 3, in order to ensure the regulation of the gap size of the discharge space 30, the display area EH on the glass substrate 21 is secured.
A wall body 51 extending in the direction orthogonal to the partition wall 29 and having the same height is provided on the outside. The wall bodies 51 are provided on both sides of the display area EH in the extension direction of the partition wall 29. The partition wall 19 on the glass substrate 11 side is extended to the outside of the display area EH so as to come into contact with the wall body 51.

Further, in the PDP 1, as shown in FIGS. 2 and 3, the height of the partition wall 29 is selected to be, for example, about 1.5 to 2 times the height of the partition wall 19. This makes it possible to dispose the phosphor 28 in a wider area closer to the display surface H than in the case where the heights of the partition walls 29 and 19 are the same, which is advantageous in terms of brightness and viewing angle.

Among the partition walls 19 and 29, the relatively low partition wall 19 is formed by pattern printing of a low melting point glass paste with a screen mask and subsequent firing.

On the other hand, since the partition wall 29 needs to have the same height as the wall body 51 and the height value is large, it is integrally formed with the wall body 51 using a photosensitive thick film material. Has been done. That is, the photosensitive insulating material is uniformly applied onto the glass substrate 21 after the address electrodes A are provided, and the partition 29 and the wall 51 are formed by baking after the pattern exposure and development processing.

The partition wall 29 and the wall body 51 integral therewith
Can be formed by screen-printing a predetermined pattern similarly to the partition wall 19. However, in that case, since the printing is repeated several times, the intersection of the partition wall 29 and the wall body 51 is formed in another portion. In contrast, the partition walls 19 and 2 rise
There is a risk that voids will occur between the nine.

FIGS. 5A and 5B are sectional views showing the structure of a PDP 2 according to another embodiment of the present invention.
5B corresponds to a cross section taken along the line BB of FIG. Figure 5
Also in FIG. 4, the same reference numerals are given to the components corresponding to FIGS. 1 to 4 and 6.

The PDP 2 is a surface discharge type PDP having a three-electrode structure, which is called a transmission type in terms of the arrangement of the phosphor, and includes the glass substrate 11 on the display surface H side, the address electrode A, and the phosphor 2.
8, partition wall 29B, wall body 52 extending in a direction orthogonal to the partition wall 19B, glass substrate 21 on the back side, display electrodes X and Y made of a metal thin film, dielectric layer 17, and protective film 1 made of MgO.
8, partition wall 19B, sealing material 31 made of low melting point glass for sealing the periphery of the discharge space 30, and partition walls 29B, 19B
It is composed of a bonding material 60 for bonding.

The barrier ribs 29B and 19B are strip-shaped in plan view, and the tops of the barrier ribs 29A and 19B are in contact with each other to partition the discharge space 30 laterally into unit light-emitting regions EU, and the gap size of the discharge space 30 is determined. Stipulates. These partition walls 29B and 19B are formed by screen printing and firing of a low melting point glass paste.

In the PDP 2, the height of the partition wall 19B on the glass substrate 21 side on which the display electrodes X and Y are arranged is selected to be larger than the height of the partition wall 29B. The surface of the partition wall 19B is covered with the protective film 17 together with the dielectric layer 17. That is, in the PDP 2, the discharge space 3
The discharge characteristics are stabilized by reducing the gas emission by making the area exposed to the discharge space 30 as small as possible within the area of the side wall of the partition wall determined according to the setting of the gap dimension of 0.

Similar to the wall body 51 of the above-described embodiment, the wall body 52 is provided to ensure the regulation of the gap size of the discharge space 30, and the both ends of each partition wall 29B parallel to each other are outside the display area EH. Is integrally formed with the partition wall 29B so as to be connected with each other.

Since the partition wall 29B and the wall 52 are relatively low, their heights are almost uniform even by screen printing. The bonding material 60 is made of crystallized glass (a kind of low-melting glass) having a softening point lower than that of the low-melting glass which is a material of the partitions 29B and 19B, and has a space between the partitions 29B and 19B at least in the display area EH. The partition walls 29B and 19B are joined over their entire lengths so that the above does not occur.

As a result, in PDP2, as shown in FIG.
As well shown in (b), the discharge space 30 is properly divided even if a defective shape such as a partial lowering of the partition wall 19B occurs, so that the display electrode Y and the address electrode A are separated. It is possible to completely suppress the unnecessary spread of the opposed discharge between the two, and it is possible to realize a high-quality display screen without display disorder.

In manufacturing the PDP 2 having the above structure,
On the glass substrate 21, the display electrodes X and Y, the dielectric layer 17,
And barrier ribs 19B are sequentially formed, and a crystallized glass paste layer having a thickness of about 20 μm to be the bonding material 60 is provided on the barrier ribs 19B by screen printing, for example, and then the dielectric layer 1 is formed.
7 and the protective film 18 are vapor-deposited so as to uniformly cover the partition wall 19B.

On the other hand, with respect to the glass substrate 11, after the address electrodes A, the partition walls 29B, the wall bodies 51, and the phosphors 28 are sequentially provided, a low melting point glass layer serving as the sealing material 31 is provided. Then, these glass substrates 11 and 21 are divided into partition walls 19
B and 29B are aligned laterally so as to overlap each other so as to face each other, and heat treatment is performed at about 500 to 600 ° C. to seal the periphery of the glass substrates 11 and 21.

At this time, as the crystallized glass paste layer softens, the partition walls 19B, 29B come into contact with each other to define the gap size of the discharge space 30, and in this state, the crystallized glass paste layer is fired to partition the partition walls 19B, 29B. 29B is joined. The protective film 18 is extremely thin (about 5000 Å)
Therefore, the portion on the crystallized glass paste layer is embedded in the paste during softening.

After that, the interior of the PDP 2 is completed by exhausting the inside and filling the discharge gas through a chip tube (not shown) provided between the display area EH and the sealing material 31. In addition,
In the evacuation step, heating is performed in order to improve efficiency, but the crystallized glass does not easily soften even if it is heated again after firing, so the bonding state of the partition walls 19B and 29B does not change.

According to the embodiments of FIGS. 1 to 4 described above, the phosphor 2 is formed on the side surface of the partition 29 as well as on the surface of the glass substrate 21.
As compared with the case where the phosphor 28 is provided only on the surface of the glass substrate 21, the brightness can be increased directly in front of the display surface H (viewing angle 0 °) and a wide range (viewing angle is provided). For example, a brightness equal to or higher than that of the front surface can be obtained over a range of −60 ° to + 60 °.

According to the embodiment of FIG. 5, the partitions 19B, 29
By joining B, the voids between the barrier ribs that hinder the localization of discharge as described above are eliminated, and the PDP 2
Can increase the mechanical strength of the
It is possible to prevent vibration noise that occurs when the structural natural vibration constant of P2 has a constant relationship.

In the above embodiment, the walls 51 and 52 may be provided on both glass substrates 11 and 21. Also,
The wall bodies 51 and 52 may be provided as long as they come into contact with the partition wall on the other substrate side, and the cross-sectional shape thereof is arbitrary and may be provided in a form of being divided from the partition wall on the same substrate. Furthermore, the wall 5
The lengths of 1, 52 do not have to correspond to the length of the display region EH in the partition arrangement direction, and are appropriately selected within a range capable of preventing the deformation of the glass substrates 11, 21 in the substrate facing direction due to the positional deviation. be able to. For example, the length may be such that it comes into contact with a plurality of partition walls at the central portion or both end portions in the partition wall array direction.

In the embodiment shown in FIGS. 1 to 4, the partition wall 19 may be formed of a photosensitive thick film material similarly to the partition wall 29. In the above-described embodiment, two or three unit light emitting areas EU are associated with one pixel of the matrix display, and each of the unit light emitting areas EU has a phosphor 28 which emits light of a different color.
Can be provided for multicolor display or color display.

[0056]

According to the present invention, the alignment of the pair of substrates can be facilitated during assembly.

According to the second aspect of the present invention, it is possible to prevent the deformation in the substrate facing direction due to the positional deviation between the substrates.
According to the invention of claim 3, even when the wall body for preventing the deformation and the partition wall on the same substrate as the wall body are provided high, these heights can be made to be the same, and an obstacle to the localization of the discharge can be prevented. It is possible to suppress the generation of voids between the partition walls.

According to the invention of claim 4, the phosphor can be provided in a wide range, and the display brightness and the viewing angle can be improved. According to the invention of claim 5, it is possible to suppress as much as possible the gas release of the partition wall which causes the change of the discharge gas composition with time.

According to the sixth aspect of the present invention, it is possible to optimize the partition of the discharge space regardless of the presence or absence of defective partition wall shape, suppress the occurrence of display disturbance, and improve the display quality. ..

According to the invention of claim 7, it is possible to enhance the reliability of the bonding of the barrier ribs between the substrates for optimizing the division of the discharge space.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a main part of a PDP according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

3 is a perspective view showing a partition structure of the PDP of FIG.

FIG. 4 is an exploded perspective view showing a sectional structure of a portion corresponding to one unit light emitting region of the PDP of FIG.

FIG. 5 is a sectional view showing a structure of a PDP according to another embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a cross-sectional structure of a portion corresponding to one unit light emitting region of a conventional surface discharge PDP.

[Explanation of symbols]

1, 2 PDP (surface discharge type plasma display panel) 11, 21 glass substrate (substrate) X, Y display electrode EU unit light emitting area EH display area 19, 29, 29B, 19B partition wall 51, 52 wall body 18 protective film 60 bonding Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Miyahara 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (7)

[Claims] 1. A surface discharge type plasma display panel (1, 2) having a three-electrode structure, wherein a discharge space is formed on each inner surface of a pair of substrates (11) (21) on the display surface side and the back surface side. A surface discharge characterized in that it has barrier ribs (19, 29B) (29, 19B) having a planar shape which is divided into unit light emitting regions (EU) in the extension direction of the display electrodes (X) (Y). Type plasma display panel. 2. A surface discharge type plasma display panel (1, 2) according to claim 1, wherein said inner surface of said at least one substrate (21) (11) is outside said display area (EH). Each partition (29, 19
The other substrate (11) extending in a direction intersecting with B)
(21) A surface discharge type plasma display panel, comprising wall bodies (51, 52) which come into contact with the above-mentioned partition walls (19, 29B). 3. The surface discharge type plasma display panel (1) according to claim 2, wherein the wall body (51) and the partition wall (29) are made of a photosensitive thick film material and integrally formed by patterning. A surface discharge type plasma display panel characterized by the following. 4. The surface discharge type plasma display panel (1) according to claim 1 or 2, wherein the partition wall (29) on the back surface side substrate (21) is the display surface side substrate. (11) A surface discharge type plasma display panel, characterized in that it is provided higher than the partition (19) above and the side surface of the partition (29) is covered with a phosphor (28). 5. The surface discharge type plasma display panel (2) according to claim 1 or 2, wherein the partition wall (19B) on the substrate (21) on the back side is
A surface discharge type which is provided higher than the partition wall (29B) on the substrate (11) on the display surface side, and the surface of the partition wall (19B) is covered with a protective film (18). Plasma display panel. 6. The surface discharge type plasma display panel (2) according to claim 1 or 2, wherein the partition walls (29B) (19B) are bonded to each other by a bonding material (60) over the entire surfaces thereof facing each other. A surface discharge type plasma display panel characterized by the following. 7. The surface discharge plasma display panel (2) according to claim 6, wherein the barrier ribs (29B) (19B) are made of low melting point glass, and the bonding material (60) is a barrier rib material. A surface discharge type plasma display panel comprising a crystallized glass having a lower softening point than that of a low melting point glass.