JP2007066569A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent variation in display characteristics of each discharge cell in which red, green, and blue phosphor layers are formed. <P>SOLUTION: The thickness of a red phosphor layer 6R, that of a green phosphor layer 6G, and that of a blue phosphor layer 6B are formed mutually different from each other, and the thickness of a barrier rib bottom plate 5A of the portions on which the red phosphor layer 6R, the green phosphor layer 6G, and the blue phosphor layer 6B are formed respectively is formed mutually different from each other. The sum of the thickness of the red phosphor layer 6R and the thickness of the barrier rib bottom plate 5A on which this phosphor is formed, the sum of the green phosphor layer 6G and that of the barrier rib bottom plate 5A on which this phosphor layer is formed, and the sum of the blue phosphor layer 6B and that of the barrier rib bottom plate on which this phosphor is formed are made to be equal mutually. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a configuration of a plasma display panel.

  In general, in a plasma display panel (PDP), a pair of row electrodes extending in the row direction is disposed on the inner surface side of a front glass substrate constituting a panel surface and is covered with a dielectric layer, and is opposed to the front glass substrate through a discharge space. Column electrodes extending in the column direction are arranged on the inner surface side of the rear glass substrate to be covered with a dielectric layer, and discharge cells are respectively formed at the intersections of the row electrode pairs and the column electrodes in the discharge space. In the cell, phosphor layers of three primary colors of red, green, and blue are formed for each discharge cell.

  In this PDP, an address discharge is selectively generated between one row electrode and a column electrode of the row electrode pair, and a portion of the dielectric layer covering the row electrode pair is opposed to the discharge cell. The light emitting cells in which the wall charges are formed and the non-light emitting cells in which the wall charges are not formed are distributed on the panel surface corresponding to the image data of the video signal. A sustain discharge is generated between the electrodes through the discharge gap, and the phosphor layer emits light, whereby an image by matrix display is formed on the panel surface.

  When the red, green and blue phosphor layers formed in each discharge cell have the same film thickness, the PDP having such a structure has different phosphors depending on the characteristics of the phosphor material forming the phosphor layer. The amount of charge due to the discharge of the surface of the layer differs for each color, and the discharge voltage of the address discharge performed with the phosphor layer sandwiched between the row electrode and the column electrode differs for each color of the phosphor layer. It is difficult to perform a uniform write operation by address discharge in a cell.

  For this reason, in the conventional PDP, the film thickness of the phosphor layer is made different for each color of red, green, and blue according to the charging characteristics of the phosphor material, or is interposed between the phosphor layer and the column electrode. The thickness of the insulating layer (dielectric layer) is made different for each color of red, green, and blue according to the charging characteristics of the fluorescent material of the phosphor layer formed thereon, The discharge voltage of the address discharge in each discharge cell is adjusted by adjusting the capacitance formed between the column electrodes to be the same, and making the charge amount on the surface of the phosphor layer substantially the same. Some are configured to be uniform (see, for example, Patent Document 1).

  However, all of the above conventional PDPs have different discharge space in the discharge cell because the thickness of the phosphor layer or the thickness of the dielectric layer on which the phosphor layer is formed differs for each color of the phosphor layer. The volume varies depending on the color of the phosphor layer formed therein, which causes a problem that the discharge state, the luminance, the light emission efficiency, and the like differ for each color of the phosphor layer.

Japanese Patent No. 3045229

  One of the technical problems of the present invention is to solve the problems in the conventional PDP as described above.

  In order to achieve the above technical problem, a PDP according to the present invention (the invention described in claim 1) is formed on a pair of substrates facing each other through a discharge space and on one of the pair of substrates. A plurality of row electrode pairs that extend in the row direction and are arranged in parallel in the column direction, and a plurality of column electrodes that are formed on the other substrate side and extend in the column direction and are arranged in parallel in the row direction. In a plasma display panel in which unit light emitting regions are formed at portions where row electrode pairs and column electrodes intersect each other, an insulating layer covering the column electrode is formed on the other substrate, and each unit on this insulating layer Red, green, and blue phosphor layers are formed in different colors for each unit light-emitting region at portions facing the light-emitting region, and a red phosphor layer and a green phosphor formed for each unit light-emitting region. Layer, blue phosphor layer thickness Are different from each other, and the red phosphor layer, the green phosphor layer, and the blue phosphor layer have different insulating layer thicknesses. And the sum of the thickness of the insulating layer in the portion where the red phosphor layer is formed, and the sum of the thickness of the insulating layer in the portion where the green phosphor layer and the green phosphor layer are formed, The sum of the thicknesses of the blue phosphor layer and the insulating layer where the blue phosphor layer is formed is equal to each other.

  In this invention, row electrode pairs are formed on the front glass substrate side, column electrodes are formed on the rear glass substrate side, and arranged in a matrix on the panel surface in the discharge space where the row electrode pairs intersect the column electrodes. Discharge cells are formed, and an insulating layer covering the column electrodes is formed on the back glass substrate, and phosphors of the three primary colors red, green, and blue are respectively formed on the portions of the insulating layer facing the discharge cells. The red phosphor layer, the green phosphor layer, and the blue phosphor layer are formed to have different thicknesses, and the red phosphor layer is formed for each discharge cell. And the green phosphor layer and the blue phosphor layer are formed so that the thicknesses of the insulating layers are different from each other, and the red phosphor layer and the red phosphor layer are formed. The sum of the thickness of the insulating layer and the green firefly The sum of the thickness of the insulating layer in the portion where the green phosphor layer and the green phosphor layer are formed, and the sum of the thickness of the insulating layer in the portion where the blue phosphor layer and the blue phosphor layer are formed PDPs having equality to each other are the best embodiment.

  In the PDP in this embodiment, during image formation, address discharge is generated by sandwiching the phosphor layer between one row electrode and column electrode constituting the row electrode pair in each discharge cell, and emits light. The discharge cells to be performed are selected. At this time, the charging characteristics of the red, green, and blue fluorescent materials forming the phosphor layer are different from each other in that the red phosphor layer, the green phosphor layer, and the blue phosphor. The thickness of the body layer is different from each other, and further, the red phosphor layer, the green phosphor layer, and the blue phosphor are set by setting the thickness of the insulating layer in the portion facing each discharge cell. Since the distance between each row electrode of the layer is equal, almost the same discharge state can be formed in each color discharge cell. Variations in luminous efficiency and discharge voltage It is prevented from that.

  That is, in the PDP, since the thicknesses of the insulating layer and the phosphor layer are adjusted for each color, the capacitance between the row electrode and the column electrode becomes almost constant, and the discharge characteristics are made uniform. It will be possible.

  Furthermore, since the volume of the discharge space in the discharge cell was not uniform in the past, the surface areas of the phosphor layers of the respective colors were different from each other, and the discharge characteristics could not be optimized well. For example, since the surface area of the phosphor layer becomes uniform, the light emission efficiency and the luminance can be improved as compared with the conventional case.

  In the PDP, the thicknesses of the red phosphor layer, the green phosphor layer, and the blue phosphor layer are, for example, between the row electrode and the column electrode constituting the row electrode pair via each phosphor layer. It is set according to the amount of charge due to the generated discharge, and the red phosphor layer is the thickest, followed by the blue phosphor layer and the green phosphor layer in that order. The thickness of the insulating layer in the portion where the red phosphor layer is formed is the thinnest, then the thickness of the insulating layer in the portion where the blue phosphor layer is formed, and the green phosphor layer is formed The thickness is increased in the order of the thickness of the insulating layer.

  This prevents variations in luminance, light emission efficiency, and discharge voltage for each color of the discharge cell.

  In the above PDP, when the insulating layer is formed of the same material as the partition that partitions the discharge space for each discharge cell, the insulating layer and the partition can be formed at the same time. Is formed integrally, it becomes easier to manufacture the PDP.

  Further, in the above PDP, when the areas parallel to the substrates of the discharge cells on which the red phosphor layer, the green phosphor layer, and the blue phosphor layer are formed have substantially the same size. Since the volumes in the discharge cells of the respective colors are substantially the same, it becomes possible to form a more uniform discharge state in the discharge cells of the respective colors.

  1 to 5 show an example of the embodiment of the present invention. FIG. 1 is a front view of the PDP in this example, FIG. 2 is a cross-sectional view taken along line V1-V1 in FIG. 1, and FIG. 4 is a sectional view taken along line V2-V2, FIG. 4 is a sectional view taken along line W1-W1 in FIG. 1, and FIG. 5 is a sectional view taken along line W2-W2 in FIG.

  1 to 5, in the PDP, a plurality of row electrode pairs (X, Y) extend in the row direction of the front glass substrate 1 (left-right direction in FIG. 1) on the back surface of the front glass substrate 1 as a display surface. In addition, they are arranged in parallel in the row direction (vertical direction in FIG. 1) at equal intervals.

  In the row electrode X constituting the row electrode pair (X, Y), a metal bus electrode Xa extends in a strip shape in the row direction, and a substantially T-shaped transparent electrode Xb is connected to the bus electrode Xa at equal intervals. Has been.

  Similarly, in the row electrode Y, a metal bus electrode Ya extends in a strip shape in the row direction, and a substantially T-shaped transparent electrode Yb is connected to the bus electrode Ya at equal intervals, so that the width of each transparent electrode Yb is wide. Are opposed to the wide head of the transparent electrode Xb of the paired row electrode X via the discharge gap g.

  A dielectric layer 2 is further formed on the back surface of the front glass substrate 1, and the row electrode pair (X, Y) is covered with the dielectric layer 2.

  The back surface of the dielectric layer 2 is opposed to the bus electrodes Xa and Ya of the adjacent row electrode pairs (X, Y) positioned back to back, and the region sandwiched between the back-to-back bus electrodes Xa and Ya. A raised dielectric layer 3 that protrudes from the back surface of the dielectric layer 2 and extends in a strip shape in the row direction is formed at the position.

  The back surface of the dielectric layer 2 where the raised dielectric layer 3 and the raised dielectric layer 3 are not formed is covered with a protective layer made of a high γ material such as MgO (not shown).

  On the other hand, a plurality of column electrodes D extending in the column direction are respectively provided on the inner surface of the rear glass substrate 4 facing the front glass substrate 1 in parallel (the surface facing the front glass substrate 1). , Y) is formed at a position facing the transparent electrodes Xb and Yb which are opposed to each other via the discharge gap g.

  Furthermore, a partition wall 5 having the following shape is formed on the inner surface of the rear glass substrate 4.

  That is, the partition wall 5 is adjacent to a partition wall bottom plate 5A covering almost the entire surface of the rear glass substrate 4 and a lateral wall 5B formed at a position facing the bus electrodes Xa and Ya of the row electrodes X and Y, respectively. Between the two horizontal walls 5B facing the bus electrodes Xa, Ya of the row electrodes X, Y at positions facing the respective row electrode pairs (X, Y) at positions facing the respective intermediate positions between the column electrodes D. And a vertical wall 5C extending in the column direction.

  In this partition wall 5, the partition wall bottom plate 5A, the horizontal wall 5B, and the vertical wall 5C are integrally formed of the same insulating material, and two horizontal walls 5B are provided for each portion facing each row electrode pair (X, Y). And a plurality of vertical walls 5C positioned in a suspended state between the two horizontal walls 5B, a substantially ladder-like frame is formed on the partition wall bottom plate 5A.

The thickness of the partition wall bottom plate 5A will be described later.
The front end surface of the horizontal wall 5B of the partition wall 5 is brought into contact with the protective layer covering the dielectric layer 3, and the discharge space between the front glass substrate 1 and the back glass substrate 4 is formed between the horizontal wall 5B and the vertical wall 5C. Thus, a rectangular discharge cell is formed by dividing each of the portions facing the transparent electrodes Xb and Yb that are opposed to each other via the discharge gap g of the row electrodes X and Y.

  In each discharge cell, phosphor layers 6R, 6G, and 6B that are color-coded into three primary colors of red, green, and blue so as to cover the five surfaces of the partition wall bottom plate 5A, the horizontal wall 5B, and the vertical wall 5C are provided. It is formed in the following manner.

  That is, one pixel P is constituted by three discharge cells adjacent to each other arranged in the row direction along each row electrode pair (X, Y), and among the three discharge cells constituting each pixel P, A red phosphor layer 6R is formed in the discharge cell located on the left side (hereinafter, this discharge cell is referred to as a red discharge cell CR), and a green phosphor layer 6G is formed in the discharge cell located in the center (hereinafter referred to as “discharge cell CR”). This discharge cell is referred to as a green discharge cell CG), and a blue phosphor layer 6B is formed in the discharge cell located on the right side (hereinafter, this discharge cell is referred to as a blue discharge cell CB).

  The red discharge cell CR, the green discharge cell CG, and the blue discharge cell CB are partitioned by the partition 5 so that the respective opening areas parallel to the front glass substrate 1 are equal to each other.

  In the red phosphor layer 6R, the green phosphor layer 6G, and the blue phosphor layer 6B, the red phosphor layer 6R has the largest film thickness tr according to the charging characteristics of the phosphor material of each color, and the blue phosphor layer The film thickness tb of 6B is the next largest, and the film thickness tg of the green phosphor layer 6G is the smallest.

  Further, the thickness dr of the partition wall bottom plate 5A of the partition wall 5 facing the red discharge cell CR is opposite to the film thicknesses of the red phosphor layer 6R, the green phosphor layer 6G, and the blue phosphor layer 6B. Is the thinnest, the plate thickness db of the partition bottom plate 5A facing the blue discharge cell CB is the next thinnest, and the plate thickness dg of the partition bottom plate 5A facing the green discharge cell CG is the thickest. Is formed.

  Then, the sum of the thickness dr of the barrier rib bottom plate 5A in the red discharge cell CR and the film thickness tr of the red phosphor layer 6R formed thereon, the plate thickness dg of the barrier rib bottom plate 5A in the green discharge cell CG, and The sum of the film thickness tg of the green phosphor layer 6G formed above, the sum of the film thickness db of the partition wall bottom plate 5A in the blue discharge cell CB and the film thickness tb of the blue phosphor layer 6B formed thereon, The sizes of the plate thicknesses dr, dg, db of the barrier rib bottom plate 5A in the red discharge cell CR, the green discharge cell CG, and the blue discharge cell CB are set so as to be equal to each other.

That is,
tr>tb> tg
dr <db <dg
tr + dr = tg + dg = tb + db
Each dimension is set so as to satisfy the relationship.

  Accordingly, the protective layer covering the dielectric layer 2 and the red phosphor layer 6R, the green phosphor layer 6G, and the blue phosphor in the discharge cells of the red discharge cell CR, the green discharge cell CG, and the blue discharge cell CB. The distances from the layer 6B are all the same, and therefore the red discharge cell CR, the green discharge cell CG, and the blue discharge cell CB have substantially the same volume.

  According to the PDP, variations in the discharge characteristics of the discharge cells of the respective colors due to differences in charging characteristics of the red, green, and blue fluorescent materials forming the phosphor layer are eliminated, and substantially the same discharge state is formed. As a result, it is possible to prevent variations in luminance, light emission efficiency, and discharge voltage for each color of the discharge cells.

  6 to 9 show a conventional PDP in which the thicknesses of the red, green, and blue phosphor layers are the same, and the PDP having the above-described configuration (the thickness of the green phosphor layer 6G and the dielectric layer 2). FIG. 6 shows the luminance, FIG. 7 shows the luminous efficiency, and FIG. 8 shows the address discharge. Illumination start voltage (discharge start voltage when wall charges are formed in the dielectric layer by address discharge), FIG. 9 shows extinguishing start voltage (discharge start voltage when erasing wall charges formed in the dielectric layer by address discharge) ) For each comparison.

  Here, R is the red discharge cell CR, G is the green discharge cell CG, B is the discharge characteristic in the blue discharge cell CB, p is the discharge characteristic of the PDP with the above configuration, and c is the discharge characteristic of the conventional PDP. Is shown.

  In FIG. 6, the normalized luminance is improved by 15 percent in the red discharge cell CR and 10 percent in the blue discharge cell CB.

  In FIG. 7, the normalized luminous efficiency is improved by 25 percent in the red discharge cell CR and 15 percent in the blue discharge cell CB.

  In FIG. 8, the standardized lighting start (Vf) voltage decreases in both the red discharge cell CR and the blue discharge cell CB.

  In FIG. 9, the normalized light extinction start (Vsm) voltage is decreased in both the red discharge cell CR and the blue discharge cell CB.

  In FIGS. 8 and 9, the respective potentials are lowered because the conventional PDP is used as a reference. This means that the high potential has been lowered to improve the discharge characteristics. is doing.

  As described above, the PDP configured as described above can improve the discharge characteristics in the discharge cells of red, green, and blue colors.

  In the above description, the case is described in which the PDP includes a partition wall in which a substantially ladder-shaped frame is formed on each partition electrode facing each row electrode pair by a horizontal wall and a vertical wall. However, the present invention is not limited to this, and the PDP has a partition wall in which a substantially lattice-like frame is formed by a horizontal wall and a vertical wall on the partition wall bottom plate, or a partition wall in which only a vertical wall extending in the column direction is formed on the partition wall bottom plate. It may be the case.

  FIG. 10 is a process explanatory view showing a process of forming the partition 5 of the PDP.

  That is, first, as shown in FIG. 10A, an insulating material Re such as an ultraviolet curable or visible light curable glass paste is filled in a mold M in which the outer shape of the partition wall 5 is engraved, and then, As shown in FIG. 10B, the mold M filled with the insulating material Re is overlaid on the rear glass substrate 4 on which the column electrodes D are formed in advance, and this insulating material Re is placed on the rear glass substrate 4. After being photocured in a state of being in close contact with each other, as shown in FIG. 10C, the mold M is peeled off and subjected to a firing step, and then a partition wall 5 is formed on the rear glass substrate 4.

  The PDP of the above embodiment is formed such that the red phosphor layer, the green phosphor layer, and the blue phosphor layer have different thicknesses, and the red phosphor layer and the green phosphor layer. The blue phosphor layers are formed so that the thicknesses of the insulating layers are different from each other, and the red phosphor layer and the insulating layer in the portion where the red phosphor layer is formed The sum of the thickness of the green phosphor layer, the sum of the thickness of the insulating layer where the green phosphor layer is formed, the blue phosphor layer and the blue phosphor layer are formed. A PDP in which the sum of the thicknesses of the insulating layers in the portions is equal to each other is an embodiment of the superordinate concept.

  In the PDP constituting this superordinate concept, the difference in charging characteristics of the red, green, and blue fluorescent materials forming the phosphor layer is different between the red phosphor layer, the green phosphor layer, and the blue phosphor layer. The thickness is different from each other, and further, the red phosphor layer, the green phosphor layer, and the blue phosphor layer are formed by setting the thickness of the insulating layer in the portion facing each unit light emitting region. Since the distance between each row electrode is equal, almost the same discharge state can be formed in the unit light emitting region of each color, and thereby the discharge characteristics for each color of the phosphor layer. Can be made uniform, and the discharge space in each unit light emitting region is made uniform, whereby the luminance and the light emitting efficiency can be improved.

It is a front view which shows one Example in embodiment of this invention. It is sectional drawing in the V1-V1 line | wire of FIG. It is sectional drawing in the V2-V2 line | wire of FIG. It is sectional drawing in the W1-W1 line | wire of FIG. It is sectional drawing in the W2-W2 line | wire of FIG. It is a graph which shows the comparison of the brightness | luminance of the Example and conventional PDP. It is a graph which shows the comparison of the luminous efficiency of the Example and conventional PDP. It is a graph which shows the comparison of the lighting start voltage of the Example and the conventional PDP. It is a graph which shows the comparison of the light extinction start voltage of the Example and the conventional PDP. It is process explanatory drawing which shows the manufacturing process of the partition of the Example, (a) is the state with which the insulating material was filled in the type | mold, (b) is the state with which the type | mold was overlaid on the back glass substrate, (c ) Shows a state in which the partition walls are formed on the rear glass substrate.

Explanation of symbols

1 ... Front glass substrate (one substrate)
2 ... Dielectric layer 4 ... Back glass substrate (the other substrate)
5 ... partition wall 5A ... partition wall bottom plate (insulating layer)
5B ... Horizontal wall (partition wall, horizontal wall)
5C ... Vertical wall (partition wall, vertical wall)
6R: Red phosphor layer 6G: Green phosphor layer 6B ... Blue phosphor layer CR: Red discharge cell (unit emission region)
CG: Green discharge cell (unit emission region)
CB: Blue discharge cell (unit emission region)
D ... Column electrode M ... Type Re ... Insulating material X, Y ... Row electrode

Claims (8)

A pair of substrates facing each other through the discharge space, a plurality of row electrode pairs formed on one of the pair of substrates, extending in the row direction and arranged in parallel in the column direction, and the other substrate side A plurality of column electrodes arranged in the column direction and arranged in parallel in the row direction, each having a unit light emitting region formed at a portion where the row electrode pair and the column electrode intersect in the discharge space. ,
An insulating layer covering the column electrode is formed on the other substrate;
A red, green, and blue phosphor layer is formed on the insulating layer facing each unit light emitting region, and is color-coded for each unit light emitting region.
The red phosphor layer, the green phosphor layer, and the blue phosphor layer formed for each unit light emitting region have different thicknesses, and the red phosphor layer, the green phosphor layer, and the blue phosphor layer are different from each other. The thicknesses of the insulating layers in the portions where the phosphor layers are formed are different from each other,
The sum of the thicknesses of the red phosphor layer and the insulating layer where the red phosphor layer is formed, and the green phosphor layer and the insulating layer where the green phosphor layer is formed The sum of the thickness of the blue phosphor layer and the sum of the thicknesses of the insulating layers where the blue phosphor layer is formed are equal to each other.
A plasma display panel characterized by that.   The red phosphor layer, the green phosphor layer, and the blue phosphor layer have thicknesses generated between the row electrode and the column electrode constituting the row electrode pair through the phosphor layers, respectively. The plasma display panel according to claim 1, wherein the plasma display panel is set in accordance with a charge amount by discharge.   The red phosphor layer is the thickest, followed by the blue phosphor layer and the green phosphor layer in this order, and the red phosphor layer is formed. The thickness of the insulating layer is the thinnest, followed by the thickness of the insulating layer where the blue phosphor layer is formed, and the thickness of the insulating layer where the green phosphor layer is formed. The plasma display panel according to claim 1. The discharge space is partitioned for each unit light emitting region by a partition formed between a pair of substrates,
The plasma display panel according to claim 1, wherein the insulating layer is formed of the same material as the partition walls.   The plasma display panel according to claim 4, wherein the partition wall and the insulating layer are integrally formed.   5. The plasma according to claim 4, wherein the partition wall has a horizontal wall portion that partitions between unit light emitting regions adjacent in the column direction, and a vertical wall portion that partitions between unit light emitting regions adjacent in the row direction. Display panel.   2. The area of each of the unit light emitting regions in which the red phosphor layer, the green phosphor layer, and the blue phosphor layer are formed have substantially the same size as each other. Plasma display panel.   The partition and the insulating layer are filled with an insulating material in a mold having a recess corresponding to the pattern of the partition and the insulating layer, and the insulating material filled in the mold is cured while being in close contact with the substrate. 6. The plasma display panel according to claim 5, wherein the mold is integrally formed by peeling the mold from the cured insulating material.

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