JP2009277405A - Plasma display panel and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a full-high-vision PDP capable of displaying proper images and having high definition. <P>SOLUTION: A plasma display panel is formed by arranging opposite a front plate 20 and a rear plate 30 so as to form a discharge cell 51 between them. On a rear-glass substrate 31, the rear plate 30 is equipped with an address electrode 32, vertical partition walls 34a installed on both right and left sides in parallel with the address electrode 32, while pinching the electrode 32, and phosphor layers 35 formed on side faces of these vertical partition walls 34a. The phosphor layers 35 are formed, in a state of being deflected, biased to only either the right or the left vertical partition wall 34a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel known as a display device.

  In recent years, expectations for large screens and wall-mounted televisions have increased as interactive information terminals, and there are many display devices such as plasma display panels, liquid crystal display panels, field emission displays, and electroluminescence displays. Among these display devices, the plasma display panel (hereinafter referred to as “PDP”) is a thin display device with excellent visibility because it is self-luminous and can display beautiful images and is easy to enlarge. It is attracting attention and development is progressing toward higher definition and larger screen.

A PDP has a discharge cell between a front plate on which components such as a display electrode, a dielectric layer, and a protective layer made of MgO are formed, and a back plate on which components such as address electrodes, barrier ribs, and phosphor layers are formed. And the periphery is sealed with a sealing member. A discharge gas in which neon (Ne), xenon (Xe), or the like is mixed is sealed in the discharge cell at a pressure of about 66500 Pa (about 500 Torr), for example (see, for example, Patent Document 1).
JP 2003-131580 A

  In this PDP, high definition, so-called full high-definition, has been demanded. However, in a full high-definition PDP with a 40-inch screen size, when the screen is viewed obliquely, bright lines and dark lines appear in the screen. There may be a problem that luminance unevenness that exists is visually recognized.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a high-definition, full high-definition PDP capable of displaying a good image.

  In order to achieve the above object, the plasma display panel of the present invention has a front plate and a back plate facing each other so as to form a discharge cell, and the back plate has an address electrode and an address on the back glass substrate. A vertical barrier rib provided on both left and right sides of the address electrode in parallel with the electrode, and a phosphor layer formed on a side surface of the vertical barrier rib, the phosphor layer being one of the left and right vertical barrier ribs The plasma display panel is characterized in that it is formed so as to be offset only on the side.

  In order to achieve the above object, the method of manufacturing a plasma display panel according to the present invention includes a front plate and a back plate that are opposed to each other so as to form a discharge cell, and the back plate is placed on the back glass substrate. A method for manufacturing a plasma display panel, comprising: an address electrode; a vertical barrier rib provided on both left and right sides of the address electrode in parallel to the address electrode; and a phosphor layer formed on a side surface of the vertical barrier rib. In addition, when applying the phosphor paste between the vertical barrier ribs by scanning while discharging it from the hole formed in the nozzle, the holes are offset and applied in either one of the left and right directions of the vertical barrier rib. A method for manufacturing a plasma display panel.

  In order to achieve the above object, the method of manufacturing a plasma display panel according to the present invention includes a front plate and a back plate that are opposed to each other so as to form a discharge cell, and the back plate is placed on the back glass substrate. A method for manufacturing a plasma display panel, comprising: an address electrode; a vertical barrier rib provided on both left and right sides of the address electrode in parallel to the address electrode; and a phosphor layer formed on a side surface of the vertical barrier rib. When the phosphor paste is applied between the vertical barrier ribs by scanning while ejecting it from the hole formed in the nozzle, the hole is configured in a state where the hole is inclined to one of the left and right sides of the vertical barrier rib. The method for producing a plasma display panel is characterized in that coating is performed in that state.

  In order to achieve the above object, the method of manufacturing a plasma display panel according to the present invention includes a front plate and a back plate that are opposed to each other so as to form a discharge cell, and the back plate is placed on the back glass substrate. A method for manufacturing a plasma display panel, comprising: an address electrode; a vertical barrier rib provided on both left and right sides of the address electrode in parallel to the address electrode; and a phosphor layer formed on a side surface of the vertical barrier rib. The plasma display is characterized in that when the phosphor paste is applied while scanning between the vertical barrier ribs while being ejected from a hole formed in a nozzle, the back plate is inclined and applied in that state. It is a manufacturing method of a panel.

  According to the present invention, it is possible to provide a high-definition, full high-definition PDP capable of displaying a good image.

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings. In the following, the field of view is defined as the angle of the line of sight that is assumed when actually watching TV and tilted to one side from a line perpendicular to the TV screen. More specifically, the visual field is 60 degrees on either side. The viewing angle is defined as 120 degrees.

  FIG. 1 is a cross-sectional perspective view showing an exploded schematic structure of a PDP according to an embodiment of the present invention. The PDP 10 is composed of a front plate 20 and a back plate 30. The front plate 20 and the back plate 30 are arranged to face each other so as to form a discharge space 40 between them, and their peripheral portions are joined by a sealing member. is there.

  In the front plate 20, a plurality of stripe-shaped display electrodes 24 that are paired with a scanning electrode 22 and a sustain electrode 23 are formed on a front glass substrate 21. Between adjacent display electrodes 24, black stripes 25 serving as light shielding portions are formed. A dielectric layer 26 is formed so as to cover the display electrode 24 and the black stripe 25, and a protective layer 27 is formed so as to cover the dielectric layer 26 with, for example, magnesium oxide (MgO).

  The back plate 30 has an address electrode 32 formed on the back glass substrate 31 in a direction crossing the display electrode 24 of the front plate 20, and a base dielectric layer 33 is provided to cover the address electrode 32. On the base dielectric layer 33, there are provided barrier ribs 34 formed in a grid pattern by vertical barrier ribs 34 a parallel to the address electrodes 32 and horizontal barrier ribs 34 b crossing the address electrodes 32. A phosphor layer 35 is provided on the side surfaces of the first and second base dielectric layers 33. In the discharge space 40 partitioned by the adjacent barrier ribs 34, the phosphor layer 35 has a red phosphor layer that emits red light, a green phosphor layer that emits green light, and a blue phosphor that emits blue light. Layers are formed in order.

  The front plate 20 and the back plate 30 as described above are arranged to face each other so that the display electrodes 24 and the address electrodes 32 intersect, and the peripheral portions thereof are sealed and joined with a sealing material. The discharge space 40 is filled with, for example, a mixed gas of neon (Ne) and xenon (Xe) as a discharge gas. Then, by selectively applying a video signal voltage to the display electrode 24, the discharge gas is discharged, and the ultraviolet rays generated thereby excite the phosphor layers 35 of each color to emit red, green, and blue colors. As a result, a color image is displayed.

  In FIG. 1, the vertical barrier ribs 34a and the horizontal barrier ribs 34b are different in height, and the horizontal barrier ribs 34b are lower than the vertical barrier ribs 34a. For example, it may be a stripe shape having only vertical partition walls, or it may be a cross-beam shape having the same height between the vertical partition walls and the horizontal partition walls.

  FIG. 2 is a plan view showing a schematic structure of a PDP according to an embodiment of the present invention as viewed from the front glass substrate 21 side of the front plate 20. Display electrodes 24 paired with scan electrodes 22 and sustain electrodes 23 are arranged with a discharge gap 50 interposed therebetween. In addition, a rectangular region defined by the vertical barrier ribs 34a and the horizontal barrier ribs 34b and intersecting the display electrodes 24 and the address electrodes 32 is a discharge cell 51 as a unit light emitting region.

  The discharge cell 51 forms a non-discharge region 52 between adjacent discharge cells 51, that is, between adjacent display electrodes 24. On the front glass substrate 21 of the non-discharge region 52, black for the purpose of improving contrast is formed. A light shielding layer 25 that is a stripe is formed. That is, the horizontal barrier rib 34b is formed in the non-discharge region 52, and the light shielding layer 25 is formed on the front glass substrate 21 at a position corresponding to the horizontal barrier rib 34b.

  On the other hand, FIG. 3 is a diagram schematically showing a back plate of the PDP in a cross section in a direction perpendicular to the vertical partition wall. FIG. 3A shows a back plate 330 of a high-definition PDP called full high vision. FIG. 3B is a diagram schematically showing a cross section in a direction perpendicular to the vertical partition walls 334a. FIG. 3B is a diagram schematically showing a back plate 430 having a resolution called high vision in a cross section in the direction perpendicular to the vertical partition walls 434a. It is. Here, the dotted lines in FIGS. 3A and 3B indicate the boundaries of the visual recognition area when the observer 60 views the PDP obliquely from the side.

  In the full high-definition PDP, there is a problem that luminance unevenness may be observed when observed from an oblique side. On the other hand, in the high-definition PDP, such a problem is not generated. This situation is thought to be caused by the following.

  That is, according to FIG. 3A, in the full high-definition PDP, the pitch of the vertical partition walls 334a is narrow because of high definition (in the case of 42-inch PDP: cell pitch 160 μm). Light emission from only the phosphor layer 335 formed on the side surface of 334a above about half in the height direction is visually recognized.

  On the other hand, according to FIG. 3 (b), the pitch of the high-definition PDP is almost twice that of the full-high-definition (in the case of 42-inch PDP: 300 μm). The observer 60 emits light from the phosphor layer 435 formed in the entire side surface region of the vertical barrier rib 434a and light emission from a region of about 1/3 of the phosphor layer 435 formed at the bottom of the discharge cell 451. Will be visible.

  Here, FIG. 4 shows the result of geometrically deriving the relationship between the height of the phosphor layer visible on the side surface of the vertical barrier rib and the discharge cell pitch when observed from oblique 60 °. In FIG. 4, the height of the vertical barrier rib is 120 μm, the top width of the vertical barrier rib is 35 μm, and the bottom width of the vertical barrier rib is 50 μm. As is clear from FIG. 4, in the HDTV PDP, the discharge cell pitch is 300 μm, so that the light emission of the phosphor layer at the bottom of the discharge cell is also visible even when observed from an oblique angle of 60 degrees. On the other hand, in full high vision with a discharge cell pitch of 160 μm, when observed from an angle of 60 degrees, only the light emission of the phosphor with the height of the side wall of the vertical barrier rib from the upper half to the upper part is recognized.

  Here, when the phosphor layer is formed in the discharge cell, the variation in the formation thereof is, for example, the discharge cell G1, the discharge cell G2, and the discharge as shown in FIG. Like the cell G3, it appears as a variation in the region attached to the side surface of the vertical partition 334a, that is, a variation in the height of attachment to the vertical partition 334a. However, in the case of a high-vision PDP, the phosphor layer 435 in the viewing region Is the sum of the entire region of the side surface of the barrier rib 434a and the region of about 1/3 of the bottom surface of the discharge cell 451 (FIG. 3B), so that the phosphor layer 435 on the side surface of the vertical barrier rib 434a is provided for each discharge cell 451. Even if the adhesion state (attachment height) varies slightly, the ratio of the variation amount to the total amount of the phosphor layer 435 in the entire viewing region is small, and thus the luminance due to the variation in the adhesion state That La is recognized is believed to be little.

  On the other hand, in the full high-definition PDP, only light emission from the phosphor layer 335 formed above about 1/2 of the height of the vertical partition wall 334a is visible, so that the side wall of the vertical partition wall 334a as described above can be seen. If there is a variation in the adhesion state of the phosphor layer 335, the ratio of the variation amount to the total amount of the phosphor layer 335 in the entire viewing region is large, and as a result, luminance unevenness is likely to be recognized.

  Therefore, in the PDP according to the embodiment of the present invention, the phosphor layer 35 formed between the vertical barrier ribs 34a is arranged on the left and right vertical sides of the discharge cell 51 as shown in FIG. It is characterized in that it is formed so as to be biased so that the height of the formation region is uniformly increased with respect to the vertical partition wall 34a on either side of the partition walls 34a. FIG. 6 shows an example in which the height of the formation region is increased with respect to the vertical barrier rib 34 a on the right side of the discharge cell 51.

  Conventionally, as a method of forming a phosphor layer in a discharge cell, a plurality of small holes (holes) are formed in the nozzle, and the phosphor is moved by flowing the phosphor paste between the barrier ribs and moving the nozzle. A method of applying a phosphor paste and forming a phosphor layer is employed. In such a method, the variation in the formation region of the phosphor layer in the discharge cell is as shown in FIG. The discharge cell 351 is generated when the discharge cell 351 is formed so as to be shifted to either one of the left and right vertical barrier ribs 334a, and the left or right side of the vertical barrier rib 334a is determined for each discharge cell 351. And prediction was impossible.

  In addition, the luminance variation due to the variation in the formation region of the phosphor layer 335 is visually observed when observed obliquely from the side when the offset state exists at random. When the state in which the layer 335 is offset to one side of the vertical partition wall 334a is offset in a unified state in one direction, the luminance seen from the right oblique side and the luminance seen from the left oblique side are Although a luminance difference occurs, the fact that the luminance unevenness that the bright line and the dark line are present in the screen is greatly reduced.

  It should be noted that the phosphor layer 335 formation region variation described above is that the phosphor paste discharged from the nozzle at the start of application is in which vertical partition 334a of the left and right vertical partitions 334a of the discharge cell 351. For example, once a state in which the height of attachment to the left vertical partition 334a is higher than that of the right vertical partition 334a is formed, the state is maintained over the entire length of the vertical partition 334a. I'm drunk.

  Therefore, in the PDP according to the embodiment of the present invention, the phosphor layer 35 in the discharge cell 51 is shifted only to one of the left and right vertical barrier ribs 34a of the discharge cell 51 as shown in FIG. In this state, as shown in FIG. 5, a state in which the variation in the adhesion of the phosphor layer 335 is different for each discharge cell 351 is avoided.

  In addition, when the phosphor layer 35 in the discharge cell 51 is in a state where it is shifted to only one of the left and right vertical barrier ribs 34a of the discharge cell 51 as shown in FIG. 6, each side in that state. The variation in the height of the phosphor layer 35 on the side surface of the vertical barrier rib 34a is about 3 μm in range, and this variation in the formation area of the phosphor layer 35 is recognized as luminance unevenness when observed obliquely from the side. Is not to be done.

  Note that the phosphor layer 35 in the discharge cell 51 is in a state of being biased only to one of the left and right vertical barrier ribs 34a in order to prevent the phosphor layer 35 from being observed as luminance unevenness when observed obliquely from the side. 7, as long as the schematic configuration of the back plate 30 is shown in a cross-sectional view, it is sufficient that the phosphor layer 35 of each of R, G, and B colors is shifted to one side. That is, for example, the discharge cells G1 to G3 in which the G (green) phosphor layer 35 is formed are unified in a state of being offset from the right vertical barrier rib 34a, and the B (blue) phosphor layer 35 is formed. The discharge cells B1 to B2 are unified so as to be offset from the left vertical barrier rib 34a, and the discharge cells R1 to R2 in which the R (red) phosphor layer 35 is formed are offset to the right vertical barrier rib 34a. It is a state that is unified with the state. In the state as described above, although the color balance is slightly disturbed when observed from an oblique side, the same green color is a bright line part in a certain area on the screen, and a certain area picture is a dark line. As a result, it is possible to significantly reduce the occurrence of the problem of luminance unevenness in which bright lines and dark lines exist.

  Next, a method for applying the phosphor paste will be described below. Conventionally, as shown in a schematic sectional view in FIG. 8, the phosphor layer has a nozzle 71 in which a plurality of small holes (holes) 72 are formed, so that the holes 72 are positioned substantially at the center between the vertical partition walls 334a. By relatively aligning the nozzle 71 and the back plate 330 and maintaining the positional relationship, the nozzle 71 is moved along the vertical partition 334a while pouring the phosphor paste 500 through the holes 72 between the partitions 334a. A phosphor layer 335 is formed.

  Here, FIG. 9 shows a result of an experiment in which the phosphor layer 35 is formed by offsetting the hole 72 of the nozzle 71 from the approximate center between the vertical partition walls 34a. In FIG. 9, the larger the number of items of the viewing angle unevenness level, the worse the brightness unevenness. As can be seen from FIG. 8, the level of the viewing angle unevenness is higher when the hole 72 is in the vicinity of the approximate center between the vertical partition walls 34a (offset is −10 μm to 0 + 10 μm). It can be seen that the level of viewing angle unevenness is lower when the hole 72 is closer to 34a. The formation state of the phosphor layer 35 in the discharge cell 51 at this time is determined as to which of the left and right vertical barrier ribs 34a of the discharge cell 51 for each phosphor layer 35 as described with reference to FIG. 5 or FIG. It has been confirmed that only one side is offset.

  If the offset amount is increased and the hole 72 is too close to the vertical partition wall 34a, the hole 72 begins to overlap the top of the vertical partition wall 34a, and the phosphor material adheres to the top of the vertical partition wall 34a. This will cause crosstalk. Therefore, it is preferable that the offset to the vertical partition wall 34a is set so that the hole 72 of the nozzle 71 does not overlap the top of the vertical partition wall 34a.

  As described above, when the hole of the nozzle 71 is positioned approximately at the center between the vertical barrier ribs 334a and the phosphor paste 500 is applied in this state, the phosphor layer 335 formed is formed vertically on the left side of the discharge cell 351. The probability of displacing to the partition wall 334a side or to the right vertical partition 334a side is half the probability, and the offset state is dispersed in the discharge cells 351 of each color, and as a result, the bright line and Although it is visually recognized as luminance unevenness with a dark line, according to the method for manufacturing a PDP according to an embodiment of the present invention, the phosphor paste 500 is applied as shown schematically in FIG. In the initial stage of setting the relative position between the hole 72 of the nozzle 71 and the discharge cell 51, the phosphor paste 500 is placed in the hole 72 in that state by being offset to the left or right in advance. By applying it in the discharge cell 51 by scanning while being discharged, the phosphor layer 35 to be formed can be formed in a state of being selectively offset toward one of the vertical barrier ribs 34a. In addition, it is possible to significantly reduce luminance unevenness when observed obliquely due to variations in the formation region of the phosphor layer 35.

  Further, for example, as schematically shown in a sectional view in FIG. 11, each hole 72 formed in the nozzle 71 is inclined in one direction with respect to the vertical partition wall 34 a of the discharge cell 51 to which the phosphor paste 500 is applied. By forming the phosphor layer 35 in this state, the phosphor layer 35 in the discharge cell 51 is shifted to only one of the left and right vertical barrier ribs 34a of the discharge cell 51. Forming can be realized.

  It should be noted that the above-mentioned hole 72 may be inclined to the left or right, and may be inclined obliquely behind or obliquely at the same time.

  In addition, as shown schematically in FIG. 12 in a cross-sectional view, the fluorescence in the discharge cell 51 can also be obtained by applying the phosphor paste 500 and forming the phosphor layer 35 with the back plate 30 inclined. The body layer 35 can be formed so as to be offset only to one of the left and right vertical barrier ribs 34 a of the discharge cell 51.

  At this time, in order to make the distance between the back plate 30 and the hole 72 of the nozzle 71 equal, it is preferable that the nozzle 71 is also tilted in the same manner as the back plate 30. As shown in FIG. 4, the holes 72 are also inclined so that the vector directions of the flow of the phosphor paste 500 in the holes 72 and the flow after being discharged from the holes 72 are matched. Is preferred.

  As described above, the present invention is useful for realizing a high-definition PDP.

1 is a cross-sectional perspective view showing a schematic structure of a PDP according to an embodiment of the present invention. The figure which shows the schematic structure of PDP by one Embodiment of this invention in the plane seen from the front glass substrate side The figure which shows the backplate of PDP schematically with the cross section of the direction perpendicular to the vertical partition The figure which shows the result of having derived | led-out geometrically derived the relationship between the height which can visually recognize the fluorescent substance layer of the vertical barrier rib side surface, and the discharge cell pitch at the time of observing from diagonal 60 degrees The figure which shows the rough structure of the backplate in section The figure which shows the schematic structure of the backplate in PDP by one Embodiment of this invention in a cross section The figure which shows the schematic structure of the backplate in PDP by one Embodiment of this invention in a cross section The figure which shows the formation state of a fluorescent substance layer in a section The figure which shows the result of the experiment which formed the fluorescent substance layer by offsetting the hole of the nozzle from the approximate center between the vertical partition walls The figure which shows the outline of the manufacturing method of PDP by one embodiment of this invention in a cross section The figure which shows the outline of the manufacturing method of PDP by one embodiment of this invention in a cross section The figure which shows the outline of the manufacturing method of PDP by one embodiment of this invention in a cross section The figure which shows the outline of the manufacturing method of PDP by one embodiment of this invention in a cross section

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plasma display panel 20 Front plate 21 Front glass substrate 22 Scan electrode 22a, 23a Transparent electrode 22b, 23b Bus electrode 23 Sustain electrode 24 Display electrode 25 Light shielding layer 26 Dielectric layer 27 Protective layer 30 Back plate 31 Back glass substrate 32 Address electrode 33 Underlying dielectric layer 34 Partition 34a Vertical partition 34b Horizontal partition 35 Phosphor layer 51 Discharge cell 71 Nozzle 72 Hole 500 Phosphor paste

Claims (4)

The front plate and the back plate are arranged to face each other so as to form a discharge cell between them,
The back plate is on the back glass substrate.
An address electrode;
Vertical barrier ribs provided on both the left and right sides of the address electrode in parallel with the address electrode,
A phosphor layer formed on a side surface of the vertical partition;
With
The plasma display panel according to claim 1, wherein the phosphor layer is formed so as to be offset from only one of the left and right vertical barrier ribs. The front plate and the back plate are arranged to face each other so as to form a discharge cell between them,
The back plate is on the back glass substrate.
An address electrode;
Vertical barrier ribs provided on both the left and right sides of the address electrode in parallel with the address electrode,
A phosphor layer formed on a side surface of the vertical partition;
A method of manufacturing a plasma display panel comprising:
When applying the phosphor paste between the vertical barrier ribs by scanning while discharging it from the hole formed in the nozzle, the hole is positioned and applied in an offset direction in either the left or right direction of the vertical barrier rib. A method of manufacturing a plasma display panel. The front plate and the back plate are arranged to face each other so as to form a discharge cell between them,
The back plate is on the back glass substrate.
An address electrode;
Vertical barrier ribs provided on both the left and right sides of the address electrode in parallel with the address electrode,
A phosphor layer formed on a side surface of the vertical partition;
A method of manufacturing a plasma display panel comprising:
When applying between the vertical barrier ribs by scanning while discharging the phosphor paste from the hole formed in the nozzle, the hole is configured in a state inclined to either the left or right direction of the vertical barrier rib, A method for producing a plasma display panel, which is applied in that state. The front plate and the back plate are arranged to face each other so as to form a discharge cell between them,
The back plate is on the back glass substrate.
An address electrode;
Vertical barrier ribs provided on both the left and right sides of the address electrode in parallel with the address electrode,
A phosphor layer formed on a side surface of the vertical partition;
A method of manufacturing a plasma display panel comprising:
A plasma display panel characterized in that when the phosphor paste is applied while scanning between the vertical barrier ribs while being ejected from a hole formed in a nozzle, the back plate is applied in an inclined state. Manufacturing method.

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