JP2010027562A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain reduction in a daylight contrast by external light reflection of a PDP image screen. <P>SOLUTION: This PDP is provided by forming a discharge space between substrates by sealing the substrate periphery, by oppositely arranging one substrate and the other substrate provided, with a barrier rib extending in the horizontal direction in a visually observed state by erecting an image screen. The barrier rib is formed so that a cross-section which is orthogonal to the extending direction of the barrier rib, forms a trapezoidal shape, having a skirt part wider than its top part with the top part of a predetermined width, and the tilting of a wall surface toward the tip part from the skirt part of its trapezoidal shape, becomes a steeper slope, in the tilting of a wall surface positioned on the upper side than the tilting of a wall surface positioned on the lower side in the visually observed state, with the image screen erected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel (hereinafter referred to as “PDP”), and more particularly to a PDP having partition walls extending in a horizontal direction for partitioning a discharge space.

  The PDP has a configuration in which electrodes, barrier ribs, phosphor layers and the like are arranged between a front substrate and a rear substrate, and a plurality of cells are formed in an internal discharge space by sealing the periphery of the substrate. ing. Then, a discharge gas is sealed in the discharge space, and the phosphor layer is caused to emit light by ultraviolet light generated by discharge between the electrodes corresponding to the cells, thereby performing color display.

  One of the quality evaluation elements of PDP is a contrast in a bright place (bright room contrast), and improving the bright room contrast is a major issue in obtaining a clear image quality.

  In the PDP, the phosphor layer and the barrier rib are generally white under natural light and are visible through the front substrate. Therefore, external light such as illumination light that has entered the panel through the substrate on the front side is reflected by the phosphor layer and the partition walls and emitted to the outside, and the reflection of such external light greatly deteriorates the contrast. It was a factor.

  In order to cope with this, a PDP or the like in which a light shielding body (metal electrode) is provided in a region where the intensity of reflected light by a phosphor layer or a partition wall is high is known (see Patent Document 1).

JP 2003-100222 A

  As the shape of the PDP partition walls, there are known ones in which the partition walls in the column direction for partitioning the cell groups in the column direction on the screen and those in which the partition walls in the column direction and the row direction are divided for each cell. By the way, in the PDP, usually, the screen is viewed horizontally with the panel upright. Therefore, in this specification, the partition in the column direction is referred to as a partition that extends in the vertical direction or a partition in the vertical direction (vertical rib), and the partition in the row direction is defined as a partition that extends in the horizontal direction or a partition in the horizontal direction ( This is called a horizontal rib.

  In the PDP, when the horizontal partition is arranged, the ratio of the partition area to the entire screen is larger than that in which the vertical partition is arranged. For this reason, the decrease in bright room contrast due to reflection of external light is also increased. Therefore, it has been desired to improve the bright room contrast in a PDP having a horizontal partition.

  The present invention has been made in consideration of such circumstances. In a state where the screen is viewed with the screen standing, the inclination of the wall surface located above the wall surface located below the partition wall extending in the horizontal direction is determined. By forming the direction with a steep slope, a decrease in bright room contrast due to external light reflection is suppressed.

  In the present invention, one substrate and the other substrate provided with a partition wall extending in the horizontal direction in a state where the screen is stood and viewed are opposed to each other, and the periphery of the substrate is sealed between the substrates. A plasma display panel in which a discharge space is formed, wherein the barrier rib has a trapezoidal shape in which a cross section perpendicular to the extending direction of the barrier rib has a top portion having a predetermined width and a skirt portion wider than the top portion. The wall surface inclination from the bottom to the top of the shape is a plasma in which the inclination of the wall surface located on the upper side is formed steeper than the inclination of the wall surface located on the lower side when the screen is viewed with the screen standing It is a display panel.

  According to the present invention, when the screen is viewed with the panel upright, the reflection of external light by the partition walls in the horizontal direction is suppressed, so that a decrease in bright room contrast is suppressed.

  In the present invention, the front side substrate and the back side substrate are made of glass, quartz, ceramics, or other desired components such as electrodes, insulating films, dielectric layers, and protective films on these substrates. A formed substrate is included.

  The difference between the inclination angle of the wall surface located on the lower side of the partition wall and the inclination angle of the wall surface located on the upper side is desirably 10 to 20 degrees. In this case, the wall surface located on the lower side of the partition wall preferably has an inclination angle of 50 to 60 degrees, and the wall surface located on the upper side preferably has an inclination angle of 70 to 80 degrees.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In addition, this invention is not limited by this, A various deformation | transformation is possible.

  FIG. 1A and FIG. 1B are explanatory views showing the configuration of an embodiment of the PDP of the present invention. FIG. 1A is a perspective view showing the entire PDP, and FIG. 1B is a partially exploded perspective view of the PDP. This PDP is an AC three-electrode surface discharge type PDP for color display.

  The PDP 1 is composed of a front substrate structure 10 and a rear substrate structure 20. The front-side substrate structure 10 is obtained by adding a component for functioning as a PDP to the front-side substrate 11. The back side substrate structure 20 is obtained by adding a component for functioning as a PDP to the back side substrate 21. A translucent glass substrate is used as the substrate 11 on the front side and the substrate 21 on the back side, but in addition to the glass substrate, a quartz substrate, a ceramic substrate, or the like can also be used.

Sustain electrodes X and scan electrodes Y that repeatedly discharge (sustain discharge) are arranged in parallel and alternately on the inner side surface of the substrate 11 on the front side. A display line L is formed between the sustain electrode X and the scan electrode Y. The sustain electrode X and the scan electrode Y include a wide transparent electrode 12 such as ITO or SnO ₂ , for example, Ag, Au, Al, Cu, Cr, or a laminate thereof (for example, a laminate structure of Cr / Cu / Cr), etc. It is comprised from the metal bus electrode (it is also called a metal electrode) 13 which consists of these.

  On the sustain electrode X and the scan electrode Y, a dielectric layer 17 made of low melting point glass or the like is formed so as to cover the sustain electrode X and the scan electrode Y. A protective film 18 made of MgO (magnesium oxide) is formed on the dielectric layer 17. That is, the sustain electrode X and the scan electrode Y disposed on the front substrate 11 are covered with the dielectric layer 17, and the protective film 18 further covers the surface. The above structure is the substrate structure 10 on the front side.

  This PDP is a so-called ALIS structure PDP in which the sustain electrodes X and the scan electrodes Y are alternately arranged at equal intervals, and the display lines L are all between the adjacent sustain electrodes X and the scan electrodes Y. However, the present invention can also be applied to a PDP having a structure in which the sustain electrode X and the scan electrode Y as a pair are arranged with an interval (non-discharge gap) where no discharge occurs.

  A plurality of address electrodes A are formed on the inner side surface of the substrate 21 on the back side in a direction intersecting with the sustain electrodes X and the scan electrodes Y in plan view, and the address electrodes A are covered on the address electrodes A. Thus, the dielectric layer 24 is formed. The address electrode A generates an address discharge for selecting a light emitting cell at the intersection with the scanning electrode Y, and is formed in a three-layer structure of Cr / Cu / Cr. In addition, the address electrode A can be formed of Ag, Au, Al, Cu, Cr, or the like.

  On the dielectric layer 24, lattice-shaped barrier ribs 29 are formed which are composed of vertical barrier ribs and horizontal barrier ribs that divide the discharge space for each cell. The vertical partition is positioned between the address electrode A and the address electrode A in plan view, and the horizontal partition is positioned so as to overlap the center of the transparent electrode 12, that is, the bus electrode 13. The partition wall 29 is a closed partition wall called a box rib, a waffle rib, a mesh rib, a ladder rib, or the like. The partition walls 29 can be formed by a sand blast method, a photo etching method, or the like. For example, in the sandblasting method, a glass paste made of glass frit, binder resin, solvent, etc. is applied on a dielectric layer and dried, and then a cutting mask having rib (partition) pattern openings on the glass paste layer is formed. It forms by spraying cutting particle | grains in the provided state, cutting the glass paste layer exposed to the opening of a mask, and also baking. In the photo-etching method, instead of cutting with cutting particles, a photosensitive resin is used as the binder resin, and it is formed by baking after exposure and development using a mask.

  Phosphor layers 28R and 28G that generate visible light of red (R), green (G), and blue (B) by being excited by ultraviolet rays on the side and bottom surfaces of the rectangular region (cell) divided by the partition walls 29, respectively. , 28B are repeatedly formed in order. The above structure is the substrate structure 20 on the back side.

  In manufacturing the PDP 1, the front-side substrate structure 10 and the rear-side substrate structure 20 are disposed so as to face each other so that the sustain electrodes X and the scan electrodes Y intersect with the address electrodes A when viewed in a plan view. . Then, the periphery of the substrate is sealed, and a discharge gas containing Ne (neon) and Xe (xenon) is sealed in the discharge space 30 surrounded by the partition walls 29, whereby the PDP 1 is manufactured. In this PDP, the discharge space 30 at the intersection of the display line L and the address electrode A between the sustain electrode X and the scan electrode Y is one cell (unit light emitting region) which is the minimum unit of display. One pixel is composed of three cells, R, G, and B.

  FIG. 2 is an explanatory view showing a state in which the PDP is seen in a plan view. The partition walls 29 are lattice-shaped partition walls composed of vertical partition walls 29a and horizontal partition walls 29b. As shown in FIG. 2, the vertical partition wall 29 a is located between the address electrode A and the address electrode A, and the horizontal partition wall 29 b is positioned so as to overlap the center of the transparent electrode 12, that is, the bus electrode 13. ing.

  FIG. 3 is an explanatory view showing a III-III cross section of FIG. In the figure, the front-side substrate structure 10 and the rear-side substrate structure 20 are drawn apart from each other so that the partition walls can be easily seen. As described above, the substrate structure 20 on the back side is formed with grid-like partition walls including vertical partition walls and horizontal partition walls 29b. The partition wall 29b in the horizontal direction is a partition wall that extends in the horizontal direction when the panel is erected.

  The partition wall 29b in the lateral direction has a trapezoidal shape in which a cross section perpendicular to the extending direction of the partition wall has a top part T having a constant width and a skirt part B wider than the top part T. As for the inclination of the wall surface toward the top T, the inclination of the wall surface U located on the upper side of the inclination of the wall surface D located on the lower side in a state where the screen is viewed with standing up is formed steeper.

  FIG. 4 is an explanatory diagram showing the gradient of the partition walls in the horizontal direction of the PDP of the present invention. The wall surface D located below the partition wall 29b in the horizontal direction has an inclination angle R1 of 50 to 60 degrees, and the wall surface U located on the upper side has an inclination angle R2 of 70 to 80 degrees. . The difference between the slope angle R1 of the wall surface D located on the lower side of the partition wall 29b in the horizontal direction and the slope angle R2 of the slope of the wall surface U located on the upper side is in the range of 10 to 20 degrees.

  Thereby, as shown in FIG. 3, when the screen is viewed with the panel upright, the illumination light S incident from the outside is incident from above the screen. For this reason, of the illumination light S incident on the screen, the light incident on the wall surface U located on the upper side of the partition wall 29b is not easily reflected to the outside. Thereby, since external light reflection is suppressed, the fall of bright room contrast can be suppressed.

  The lateral partition walls 29b as described above can be formed by a sandblasting method or a transfer method. In the case of forming by the sandblast method, the cutting particles are formed by spraying from an oblique direction. In the case of forming by the transfer method, a mother mold having a convex portion having the same shape as the lateral partition wall 29b described above is manufactured, a transfer intaglio is prepared from the mother mold, and the transfer intaglio is used. The barrier rib material is formed by transferring it onto the substrate.

It is explanatory drawing which shows the structure of one Embodiment of PDP of this invention. It is explanatory drawing which shows the state which looked at PDP of this invention planarly. It is explanatory drawing which shows the III-III cross section of FIG. It is explanatory drawing which shows the gradient of the partition of the horizontal direction of PDP of this invention.

Explanation of symbols

1 PDP
DESCRIPTION OF SYMBOLS 10 Front side board structure 11 Front side board 12 Transparent electrode 13 Bus electrode 17, 24 Dielectric layer 18 Protective film 20 Back side board structure 21 Back side board 28R, 28G, 28B Phosphor layer 29 Bulkhead 29a Vertical direction Partition wall 29b lateral partition wall 30 discharge space A address electrode X sustain electrode Y scan electrode

Claims (3)

One substrate and the other substrate provided with partition walls extending in the horizontal direction in a state where the screen is erected and faced are arranged to face each other, and a discharge space is formed between the substrates by sealing the periphery of the substrate A plasma display panel,
The partition wall has a trapezoidal shape in which a cross section perpendicular to the extending direction of the partition wall has a top portion having a predetermined width and a skirt portion wider than the top portion, and the inclination of the wall surface from the skirt portion of the trapezoid shape toward the top portion. However, the plasma display panel in which the slope of the wall surface located on the upper side is formed to be steeper than the slope of the wall surface located on the lower side when the screen is viewed with the screen standing.   The plasma display panel according to claim 1, wherein a difference between an inclination angle of the wall surface located below the partition wall and an inclination angle of the wall surface located above is 10 to 20 degrees.   The plasma display panel according to claim 1 or 2, wherein the wall surface located below the partition wall has an inclination angle of 50 to 60 degrees, and the wall surface located on the upper side has an inclination angle of 70 to 80 degrees.

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