JP2009176574A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP which can prevent generation of a vibration sound during driving and also prevent reduction in discharge characteristics during manufacturing. <P>SOLUTION: A partition wall includes a roughly lattice shape having a horizontal wall extending in a row direction and a vertical wall extending in a column direction. An adhesive layer is formed only on a face opposing one substrate side of an optional intersection part among parts in which the horizontal wall and the vertical wall of this partition wall are intersected. One substrate and another substrate are secured to each other by adhering this adhesive layer to one substrate side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the structure of a plasma display panel.

  Generally, a plasma display panel (hereinafter referred to as a PDP) has a plurality of row electrode pairs extending in the row direction on the back surface of a front glass substrate, and arranged in a column direction on the back glass substrate facing the front glass substrate through a discharge space. A plurality of extending column electrodes are formed, each discharge cell is formed in a discharge space where the row electrode pair and the column electrode intersect, and each partition is partitioned by a partition, and each discharge cell is color-coded for each discharge cell. In addition, it has a configuration in which red, green and blue phosphor layers are formed.

  And between the front glass substrate and the back glass substrate, a sealing layer for sealing the discharge space is formed along the outer peripheral edge of the discharge space, and the front glass substrate and the back glass substrate are mutually connected by this sealing layer. It is fixed inseparable.

  In the PDP having such a configuration, an address discharge is selectively generated between one row electrode and a column electrode of the row electrode pair, and a sustain discharge is generated in a discharge cell (light emitting cell) selected by the address discharge. As a result, the red, green, and blue phosphor layers emit light, thereby forming an image by matrix display.

  Conventionally, the PDP having the above-described configuration is repeatedly expanded and contracted in the discharge gas enclosed in the discharge space by repeating various discharges such as an address discharge and a sustain discharge in each discharge cell at the time of driving. Further, repulsion and suction are repeated between the front glass substrate and the rear glass substrate by the electrostatic force generated by the voltage applied between the row electrode and the column electrode.

  For this reason, when the PDP is driven, minute vibrations are generated in the front glass substrate and the rear glass substrate, and the space between the front glass substrate and the rear glass substrate is formed along the outer peripheral edge of the discharge space in order to seal the discharge space. When they are fixed to each other only by the sealing layer, abnormal noise and noise are generated due to repeated contact and separation between the top of the partition wall and the structure on the front glass substrate side, which makes the user uncomfortable. The problem of giving

  In some conventional PDPs, the top surface of the partition wall is bonded so as not to be separated from the other substrate side by an adhesive layer formed on the inner surface side of the other opposing substrate (for example, Patent Document 1). reference).

  In this conventional PDP, the adhesive layer is formed on the inner surface side of the other substrate in the same pattern as the partition wall by a glass frit for sealing, and this adhesive layer adheres the entire top surface of the partition wall to the inner surface side of the other substrate. By doing so, it has the effect of preventing the generation of vibration noise due to minute vibrations of the substrate.

  However, in this conventional PDP, since the adhesive layer is formed in the same pattern as the partition and has a large volume, the adhesive layer is formed when the adhesive layer is welded to the partition by heating in the manufacturing process. A large amount of impure gas is generated from the glass frit for sealing, and therefore, the inside of the panel is contaminated, for example, because the function of the MgO layer for protecting the dielectric layer covering the row electrode is deteriorated. The PDP has a problem of deteriorating the discharge characteristics.

Japanese Patent Laid-Open No. 3-263733

  An object of the present invention is to solve the problems of the conventional PDP as described above.

  In order to achieve the above object, a PDP according to the present invention has a pair of substrates facing each other through a discharge space, and a plurality of pairs of row electrodes extending in the row direction and arranged in parallel in the column direction are provided on one substrate side. And a plurality of column electrodes extending in the column direction and arranged in parallel in the row direction on the other substrate side, and a partition wall that divides a unit light emitting region formed at a portion where the column electrode and the row electrode pair of the discharge space intersect each other And a phosphor layer formed in a unit light emitting region partitioned by the barrier ribs, the barrier ribs having a substantially lattice shape having a horizontal wall extending in the row direction and a vertical wall extending in the column direction. In the plasma display panel in which the layers are formed of phosphor materials of at least three colors different for each unit light emitting region and phosphor layers of different colors are sequentially arranged in the row direction, the horizontal wall and the vertical wall of the partition intersect each other Any intersection The adhesive layer is formed only on the surface facing the one substrate side, and the adhesive layer adheres to the one substrate side to fix the one substrate and the other substrate to each other. Yes.

  In the present invention, a pair of substrates are opposed to each other through a discharge space, a plurality of row electrode pairs extending in the row direction and arranged in parallel in the column direction are provided on one substrate side, and the column direction is provided on the other substrate side. A plurality of column electrodes arranged in parallel in the row direction, a partition wall that partitions a unit light emitting region formed at a portion where a column electrode and a row electrode pair in the discharge space intersect, and a unit light emission partitioned by the partition wall The phosphor layer formed in the region is provided, the partition wall has a substantially lattice shape having a horizontal wall extending in the row direction and a vertical wall extending in the column direction, and the phosphor layer is different for each unit light emitting region. In a plasma display panel in which phosphor layers of different colors formed by color fluorescent materials are arranged in order in a row direction, one substrate side of an arbitrary intersecting portion of the intersecting portions of the horizontal wall and the vertical wall of the partition wall Only on the surface facing Wearing layer is formed, a PDP that secure together the one substrate and the other substrate by the adhesive layer adheres to one substrate side to its best embodiments.

  According to the PDP of this embodiment, in the display area of the PDP, the two substrates facing each other through the discharge space are fixed to each other by the adhesive layer formed on the partition wall, so that the driving of the PDP Occasionally, the substrate is prevented from vibrating and driving noise is generated.

  An adhesive layer for fixing the two substrates to each other in the display area of the PDP is formed only at an arbitrary crossing portion of the crossing portion of the horizontal wall and the vertical wall of the partition wall. Compared to the conventional PDP in which the adhesive layer is formed, since the material for forming the adhesive layer can be reduced, the adhesive layer is not formed in the manufacturing process of the PDP, for example, when the adhesive layer is formed by a glass frit material. When heated and welded to one substrate side, it is possible to prevent the discharge space from being contaminated by impure gas generated from the adhesive layer and the discharge characteristics of the PDP from being deteriorated.

  In the PDP of the above embodiment, the phosphor layer is formed of fluorescent materials having different colors of the first color, the second color, and the third color for each unit light emitting region, The area of the intersection of the vertical wall and the horizontal wall located between the adjacent unit light emitting regions where the phosphor layers of the first color and the second color are formed is larger than the other intersections. It is preferable that the adhesive layer is formed only on the surface of the intersecting portion where is increased.

  As a result, it is possible to secure a sufficient welding area between the adhesive layer and one substrate side necessary for preventing the generation of vibration noise, and further, the glass frit material forming the adhesive layer protrudes into the discharge cell. Thus, it is possible to prevent a decrease in luminance and a decrease in light emission efficiency during PDP driving.

In the PDP of the above embodiment, the third color fluorescent material among the first color, second color, and third color fluorescent materials may have the highest luminance.
As a result, it is possible to prevent a decrease in luminance of the entire PDP.
In the PDP of the above embodiment, the third color fluorescent material among the first color, second color, and third color fluorescent materials may have the lowest luminance.

In this case, the brightness balance between the unit light emitting areas of the respective colors is ensured, and the white balance can be taken.
In the PDP of the above embodiment, the phosphor material forming the phosphor layer has three colors of red, green, and blue, and the unit light-emitting region in which the red phosphor layer is formed and the blue phosphor layer It is preferable that the area of the intersecting portion between the vertical wall and the lateral wall located between the formed unit light emitting regions is larger than the other intersecting portions.

  As a result, as the area of the top surface of the intersecting portion of the horizontal wall and the vertical wall is increased to form the adhesive layer, a red phosphor layer is formed due to the characteristics of the phosphor material forming the phosphor layer. It is no longer necessary to reduce the opening area of the unit light emitting region in which the green phosphor layer having a higher luminance than the unit light emitting region and the unit light emitting region in which the blue phosphor layer is formed. Can be prevented.

  In the above, as an aspect of increasing the area of the intersection of the horizontal wall and the vertical wall, the unit phosphor regions are arranged in the column direction for each color of the phosphor layer, and the red phosphor layer adjacent in the column direction of the horizontal wall The width in the column direction of the portion located between the unit light emitting regions where the green phosphor layer is formed and between the unit light emitting regions where the blue phosphor layer is formed is between the unit light emitting regions where the green phosphor layer is formed. A mode in which the width is larger than the width of the portion to be positioned is given.

  In the PDP of the above embodiment, the row electrode pair generates a discharge between the first row electrode and the first row electrode that generates a discharge between the unit light emitting region and the column electrode. And the first row electrode and the second row electrode of the row electrode pair are alternately arranged between adjacent row electrode pairs, and the first row electrodes and the second row electrodes are respectively arranged. The lateral walls of the partition walls are positioned back-to-back with each other, and are arranged at positions facing the first row electrode or the second row electrode that are positioned back-to-back with each other in adjacent row electrode pairs. It is preferable that the adhesive layer is formed only on the surface of the intersecting portion of the horizontal wall and the vertical wall facing the one-row electrode.

  As a result, only the area of the top surface of the lateral wall facing the row electrode X that is not involved in the address discharge during PDP driving (discharge generated between the column electrode to select a discharge cell to emit light) is enlarged. Therefore, generation of vibration noise can be prevented without reducing the probability of occurrence of address discharge with the formation of the adhesive layer.

In the PDP of the above embodiment, the interval between the adjacent adhesive layers is
f = (22 / 2πL ² ) × √ (Eh ² / 12ρ)
L: Distance between adhesive layers
f: natural frequency
E: Young's modulus of the substrate
h: thickness of substrate
ρ: It is preferable that the natural frequency is set to a value larger than 20 kHz based on the density equation of the substrate.

  As a result, the number of adhesive layers can be reduced to the maximum while effectively suppressing the generation of vibration noise in the human audible band.

In the PDP of the above embodiment, the interval between the adjacent adhesive layers is
f = (22 / 2πL ² ) × √ (Eh ² / 12ρ)
L: Distance between adhesive layers
f: natural frequency
E: Young's modulus of the substrate
h: thickness of substrate
ρ: It is preferable that the natural frequency is set to a value larger than 4 kHz based on the density equation of the substrate.

  This makes it possible to reduce the number of adhesive layers to the maximum while effectively suppressing the generation of harsh and unpleasant vibration noise.

  1 to 5 show a first example of a PDP according to an 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 the line H-H in FIG. 3 is a cross-sectional view taken along line V1-V1 in FIG. 1, FIG. 4 is a cross-sectional view taken along line V2-V2 in FIG. 1, and FIG. 5 is a cross-sectional view taken along line V3-V3 in FIG.

  1 to 5, a plurality of row electrode pairs (X, Y) are respectively extended in the row direction (left and right direction in FIG. 1) on the back surface of the front glass substrate 1 constituting the display surface of the PDP and in the column direction ( 1 are arranged in parallel to each other in the vertical direction of FIG.

  The row electrodes X and Y constituting the row electrode pair (X, Y) are bus electrodes Xa, Ya, bus electrodes Xa, Ya, etc. from a metal film extending in a strip shape in the row direction of the front glass substrate 1, respectively. A plurality of transparent electrodes Xb and Yb made of ITO or the like that are connected to the interval positions and extend in the column direction to the paired row electrode side and face each other via the discharge gap g. ing.

  The arrangement of the row electrodes X and Y of this row electrode pair (X, Y) is alternately switched between adjacent row electrode pairs (X, Y), and XY, Y-X, X- The row electrodes X and the row electrodes Y are positioned back to back between adjacent row electrode pairs (X, Y) as indicated by Y.

A dielectric layer 2 is further formed on the back surface of the front glass substrate 1 to cover the row electrode pair (X, Y), and a protective layer 3 is formed on the back surface of the dielectric layer 2 with magnesium oxide or the like. Thus, the back surface of the dielectric layer 2 is covered.
A rear glass substrate 4 is opposed to the front glass substrate 1 in parallel with a predetermined interval.

  On the surface (inner surface) of the rear glass substrate 4 facing the front glass substrate 1, a plurality of column electrodes D are opposed to each other via the discharge gap g of the row electrode pairs (X, Y). Are arranged in parallel at a predetermined interval in the row direction so as to extend in the column direction (direction orthogonal to the row electrode pair (X, Y)) at a position facing the transparent electrodes Xb and Yb. ing.

Further, a column electrode protective layer (dielectric layer) 5 is formed on the inner surface of the back glass substrate 4, and the column electrode D is covered with the column electrode protective layer 5.
A partition wall 6 is formed on the column electrode protective layer 5.

  The partition wall 6 includes two bus electrodes Xa of the row electrode pairs (X, Y) adjacent to each other in the column direction, the band-like portions therebetween, and the two bus electrodes Ya positioned back to back. A plurality of horizontal walls 6A extending in the row direction at positions facing the belt-like portions therebetween, and a plurality of vertical walls 6B extending in the column direction at positions facing the portions between adjacent column electrodes D are formed into a substantially ladder shape. Molded.

And, by this partition wall 6, the discharge space formed between the front glass substrate 1 and the rear glass substrate 5 is a portion of the row electrode pair (X, Y) facing the transparent electrodes Xb and Yb that are paired with each other. A discharge cell C is formed for each partition.
The shape of the partition wall 6 will be described in detail later.

  Phosphor layers 7 are formed on the side walls 6A and 6B of the partition walls 6 facing the discharge cells C and on the side surfaces of the column electrode protection layer 5, and these five surfaces are covered with the phosphor layers 7. ing.

  The phosphor layer 7 includes a red phosphor layer 7 (R) formed of a red phosphor material, a green phosphor layer 7 (G) formed of a green phosphor material, and a blue phosphor formed of a blue phosphor material. A red discharge cell C (R) in which a phosphor layer 7 (B) is formed and a red phosphor layer 7 (R) is formed; and a green discharge cell C (G) in which a green phosphor layer 7 (G) is formed; The blue discharge cells C (B) on which the blue phosphor layers 7 (B) are formed are arranged in order in the row direction, such as RGBBRGGB ... The discharge cells C of the same color are arranged in the direction.

A sealing layer (not shown) is formed between the front glass substrate 1 and the rear glass substrate 4 along the four outer peripheral edges of the discharge space. The discharge space is sealed by the sealing layer, and the front glass is sealed. The substrate 1 and the back glass substrate 4 are fixed so as not to be separated from each other.
A discharge gas containing xenon is sealed in the discharge space.

Next, the shape of the partition wall 6 will be described in detail.
Of the horizontal wall 6A of the partition wall 6, two bus electrodes Xa of the row electrode pairs (X, Y) adjacent to each other in the column direction and the first horizontal wall 6A1 facing the band-like portion therebetween are arranged in the row direction. Portions on both sides sandwiching a portion intersecting the first vertical wall 6B1 located between the adjacent blue discharge cell C (B) and the red discharge cell C (R) (blue discharge cells C (B) adjacent in the column direction) The width d1 in the row direction of the portion positioned between the red discharge cells C (R) adjacent in the column direction) is positioned between the green discharge cells C (G) adjacent in the column direction. It is formed so as to be larger than the width d2 of the portion.

  That is, the first horizontal wall 6A1 is shaped so that the front area viewed from the front glass substrate 1 side at the intersection with the first vertical wall 6B1 is larger than the front area of the other part of the first horizontal wall 6A1. Yes.

  In the illustrated example, the first horizontal wall 6A1 has a width d1 in the column direction between the green discharge cells C (G) and the blue discharge cells C (B) between the blue discharge cells C (B) adjacent in the column direction. At the intersection with the third vertical wall 6B3 located between them, the width d2 of the portion located between the green discharge cells C (G) of the first horizontal wall 6A1 is the same, but from the left to the right in FIG. It gradually increases and becomes maximum at a portion where the first vertical wall 6B1 and the first horizontal wall 6A1 intersect, and thereafter gradually decreases in the right direction between the red discharge cells C (R) adjacent in the column direction. The green discharge cell C (G) is again connected at the portion where the second vertical wall 6B2 and the first horizontal wall 6A1 located between the adjacent red discharge cell C (R) and the green discharge cell C (G) intersect. The width d2 of the portion of the first horizontal wall 6 The front shape viewed from the front glass substrate 1 side of the intersection 6A1a with one of the first vertical wall 6B1, are substantially rhombic.

  Of the horizontal wall 6A of the partition wall 6, the second horizontal wall 6A2 facing the two bus electrodes Ya positioned back to back is similar to the conventional PDP in that the front shape viewed from the front glass substrate 1 side has a width in the column direction. Are formed in a certain strip shape along the row direction, and in the illustrated example, the width in the column direction of the second horizontal wall 6A2 is the width in the column direction between the green discharge cells C (G) of the first horizontal wall 6A1. It is set to the same size as d2.

  Adhesive layers 8 are formed of glass frit material on the top surfaces of the intersections 6A1a of the first horizontal walls 6A1 and the first vertical walls 6B1, respectively.

  In the PDP manufacturing process, for example, a glass frit material is formed on the intersecting portion 6A1a of the first lateral wall 6A1 of the partition wall 6 with a required accuracy by, for example, screen printing, and is formed into a substantially cylindrical shape in the illustrated example. ing.

  The area of the top surface of the intersecting portion 6A1a of the first horizontal wall 6A1 is determined in accordance with the printing accuracy of the printing apparatus that applies the glass frit material on the intersecting portion 6A1a in the PDP manufacturing process.

  Each adhesive layer 8 is a seal (not shown) formed on the peripheral edge of the back glass substrate 4 in a state where the front glass substrate 1 is superimposed on the back glass substrate 4 during the sealing process in the manufacturing process of the PDP. The front glass substrate 1 is fixed to the rear glass substrate 4 together with the sealing layer so as not to be separated by being heated together with the layers and welded to the inner surface of the protective layer 3 on the front glass substrate 1 side.

  The PDP has a front glass substrate 1 side and a rear surface in the display area of the PDP by an adhesive layer 8 formed on the top surface of the intersection 6A1a between the first horizontal wall 6A1 and the first vertical wall 6B1 of the partition wall 6, respectively. Since the space between the glass substrate 4 and the glass substrate 4 is fixed so as not to be separated, it is possible to prevent generation of vibration sound due to minute vibrations of the front glass substrate and the back glass substrate during PDP driving.

  In the PDP, the adhesive layer 8 that fixes the protective layer 3 on the front glass substrate 1 side and the partition wall 6 on the rear glass substrate 4 side so as not to be separated in the display area of the PDP is provided with the horizontal wall 6A and the vertical wall of the partition wall 6. Compared to the case of the conventional PDP in which the adhesive layer is formed over the entire top surface of the partition wall by being formed only on the top surface of the selected arbitrary crossing portion among the crossing portions of 6B. Therefore, the volume of the adhesive layer 8 is small (that is, the amount of the glass frit material forming the adhesive layer 8 is small). Therefore, the amount of impure gas generated from the glass frit material by heating during the sealing process in the manufacturing process As compared with the conventional PDP, it is possible to significantly reduce the discharge characteristics of the PDP by preventing contamination of the inside of the panel by impure gas generated from the glass frit material. Can.

  Further, in the PDP, the area of the top surface of the intersecting portion of the horizontal wall 6A and the vertical wall 6B where the adhesive layer 8 of the partition wall 6 is formed is larger than the area of the top surface of the intersecting portion of the other horizontal wall and the vertical wall. As a result, it is possible to secure a sufficient welding area with the front glass substrate 1 side of the adhesive layer 8 necessary for preventing the generation of vibration noise, and the glass frit material for forming the adhesive layer 8 can thereby be obtained. It can be prevented from protruding into the discharge cell, and effective generation of vibration noise can be prevented, and luminance and luminous efficiency can be prevented from being lowered when the PDP is driven.

  Further, the PDP has only the area of the top surface of the intersection 6A1a between the first vertical wall 6B1 and the first horizontal wall 6A1 located between the red discharge cell C (R) and the blue discharge cell C (B) of the barrier rib 6. As the area of the top surface of the intersecting portion of the horizontal wall and the vertical wall is increased in order to form the adhesive layer 8, the red discharge cell C depends on the characteristics of the fluorescent material forming the phosphor layer. There is no need to reduce the opening area of the green discharge cell C (G), which has a higher luminance than the (R) or blue discharge cell C (B).

  Generally, as a characteristic of the fluorescent material, the green fluorescent material has the highest luminance as compared with red and blue, and the contribution to the luminance of the entire panel is as large as 50% or more. Therefore, by ensuring the opening area of the green discharge cell C (G), it is possible to prevent a decrease in luminance of the entire panel.

  When the luminance of the discharge cells other than the green discharge cell C (G) is maximized by the fluorescent material forming the phosphor layer, the vertical wall and the horizontal wall located between the other two color discharge cells. What is necessary is just to enlarge the area of the top surface of the part which crosses.

  On the other hand, as a characteristic of the fluorescent material, the blue fluorescent material has the lowest luminance. Therefore, although not shown, only the area of the top surface of the intersection of the second vertical wall 6B2 and the first horizontal wall 6A1 located between the red discharge cell C (R) and the green discharge cell C (G) of the barrier rib 6 is determined. You may expand and may form the contact bonding layer 8 there.

  In this case, as the area of the top surface of the intersection of the horizontal wall and the vertical wall is increased in order to form the adhesive layer 8, the red discharge cells C (R) and There is no need to reduce the opening area of the blue discharge cell C (B) having a lower luminance than the green discharge cell C (G).

  As a result, the luminance balance between the green discharge cell C (G), the red discharge cell C (R), and the blue discharge cell C (B) is ensured, and white balance can be achieved.

  When the luminance of the discharge cells other than the blue discharge cell C (B) is minimized by the fluorescent material forming the phosphor layer, the vertical wall and the horizontal wall located between the other two color discharge cells. What is necessary is just to enlarge the area of the top surface of the part which 6 crosses.

  Further, the PDP has an arrangement in which the row electrodes X and Y of the row electrode pair (X, Y) are alternately switched between the adjacent row electrode pairs (X, Y). X, Y) address discharge (light emission) at the time of PDP driving by increasing the area of the top surface of the intersection of the first horizontal wall 6A1 and the vertical wall 6B facing the row electrodes X located back to back. Generation of vibration noise can be prevented without lowering the probability of occurrence of discharge between the column electrodes to select a discharge cell to be generated.

  That is, since the address discharge is generated between the row electrode Y and the column electrode D of the row electrode pair (X, Y), when the area of the top surface of the horizontal wall facing the row electrode Y is expanded, the row electrode Although the facing area between Y and the column electrode D is reduced, the probability of occurrence of address discharge may be reduced, but in the PDP, only the area of the top surface of the lateral wall facing the row electrode X not involved in address discharge is enlarged. Therefore, there is no possibility of reducing the address discharge occurrence probability.

  Furthermore, in general, when the width of the portion intersecting the vertical wall of the horizontal wall of the partition wall is formed so as to be larger than the width of the other portion, when firing in the manufacturing process of the PDP, In the PDP, the height of the intersection 6A1a of the first horizontal wall 6A1 with the first vertical wall 6B1 is larger than the other parts because the part where the width of the horizontal wall is larger than the other part. Since the adhesive layer 8 formed on the intersecting portion 6A1a is more strongly pressed against the front glass substrate 1, the front glass substrate 1 and the rear glass substrate 4 are more firmly fixed, Occurrence can be prevented.

  In the above embodiment, in order to secure the area on the top surface of the partition wall necessary for forming the adhesive layer, the width of the intersecting portion with the vertical wall on which the adhesive layer of the horizontal wall is formed is other than that. It is formed to be larger than the portion, but the width of the partition wall is large as a whole, and the top surface of the partition wall has a sufficient area to apply the glass frit material for forming the adhesive layer. When it is, it is not necessary to enlarge the width | variety of the cross | intersection part with the vertical wall of the horizontal wall of a partition especially.

  In the above embodiment, the PDP in which the discharge cells adjacent in the column direction are separated by one horizontal wall of the partition wall has been described. However, the discharge cells adjacent in the column direction sandwich the slit. It may be partitioned by two horizontal walls extending parallel to the row direction. In this case, when forming an adhesive layer on the top surface of the intersection of the horizontal wall and the vertical wall of the partition wall, the top surface of the partition wall The glass frit material applied on the top flows into the slit between the lateral walls and the amount of the coating increases, but the glass frit material does not protrude into the discharge cell, so that the discharge characteristics of the PDP are affected. There is no risk of it occurring.

  In the PDP of the first embodiment described above, an embodiment for further reducing the number of adhesive layers formed on the partition walls will be described below.

  In this embodiment, the appropriate number of adhesive layers formed on the partition wall is set by appropriately setting the distance between adjacent adhesive layers necessary for effectively preventing the generation of vibration noise when driving the PDP. In addition, the number of adhesive layers (that is, the amount of the glass frit material used for forming the adhesive layer) is reduced by forming the minimum necessary adhesive layers.

Generally, the natural frequency f (Hz) when driving the PDP is
f = (22 / 2πL ² ) × √ (Eh ² / 12ρ) (1)
L (mm): Length of span
E (Pa): Young's modulus of the substrate
h (mm): substrate thickness
ρ (Kg / m ³ ): It is determined by the density formula.

In the above equation (1), the span L indicates the distances L1, L2, and L3 between the adhesive layers 8 adjacent to each other in FIG. 1, and prevents the generation of vibration noise when the PDP is driven. In order to reduce vibration sound in an audible band and vibration sound in a band that is particularly unpleasant and unpleasant for humans, by setting the natural frequency f when driving the PDP in advance, the spacing between the adhesive layers 8 The optimum values of L1, L2, and L3 can be obtained.
It can be seen from the above formula (1) that the natural frequency f decreases as the span L increases.

  Generally, the upper limit of the human audible band is said to be 20 kHz, and further, the band that is particularly disturbing and uncomfortable for human beings is said to be 3 kHz to 4 kHz.

For example, in a PDP having a substrate with a thickness h of 1.8 mm, a Young's modulus E of 80 × 10 ⁹ Pa, and a density ρ of 2.5 × 10 ³ kg / m ³ , f> 20 kHz (ie, PDP From the above equation (1), it can be seen that it is necessary to set L1, L2, L3 <22.6 mm in order to set the natural frequency to a value greater than or equal to the upper limit of the human audible band.

  Therefore, in this case, each of the distances L1, L2, and L3 between the adjacent adhesive layers 8 is less than 22.6 mm, and is set to the maximum value allowed in the structure of the PDP. Is not audible to humans, and vibration noise is prevented from being generated in the human audible band.

  When the substrate conditions are the same as described above, 3 kHz ≦ f ≦ 4 kHz (that is, the natural frequency of the PDP is a band that is particularly unpleasant and uncomfortable for humans) is from the above equation (1). 50.7 mm ≦ L1, L2, L3 ≦ 58.6 mm.

  Therefore, in this case, if the distances L1, L2, and L3 between the adjacent adhesive layers 8 are set to be less than 50.7 mm or larger than 58.6 mm, the vibration sound level that is harsh and uncomfortable is obtained. It is suppressed.

  In this case, if the intervals L1, L2, L3 of the adhesive layer 8 are set to a very large value, the partition wall and the front glass substrate are in contact with each other in the portion other than the adhesive layer depending on the unevenness of the partition wall and the warp of the substrate, This is not preferable because a vibration sound caused by the contact point is generated.

  When the distances L1, L2, and L3 of the adhesive layer 8 are set as large as possible in the PDP structure of less than 50.7 mm, it is possible to suppress generation of vibration sound levels that are harsh and unpleasant, The number of sealing layers formed on the partition walls is smaller than when L1, L2, and L3 are set to less than 22.6 mm.

  From the above, in the PDP of this embodiment, in order to suppress the generation of vibration sound in the human audible band, the values of the distances L1, L2, and L3 of the adhesive layer 8 are set as f> 20 kHz in the equation (1). In order to suppress the generation of unpleasant and unpleasant vibration noise and to reduce the number of adhesive layers 8, it is sufficient to set the maximum value possible for the structure of the PDP. As the values of the intervals L1, L2, and L3, it is understood that the maximum value that is possible in the structure of the PDP among L that satisfies f> 4 kHz in Equation (1) may be set.

  In the PDP in this embodiment, the distances L1, L2, and L3 between the adjacent adhesive layers 8 are calculated as described above, thereby effectively suppressing the generation of vibration sound in the human audible band, It is possible to effectively suppress the generation of unpleasant vibration noise, and to form the minimum necessary adhesive layer, thereby reducing the amount of glass frit material used for forming the adhesive layer. Therefore, the amount of impure gas generated from the glass frit material in the manufacturing process can be further reduced.

  In the PDPs of the above embodiments, a pair of substrates are opposed to each other through a discharge space, and a plurality of row electrode pairs extending in the row direction and arranged in parallel in the column direction are provided on one substrate side, and the other substrate side In addition, a plurality of column electrodes extending in the column direction and juxtaposed in the row direction, a partition partitioning a unit light emitting region formed at a portion where the column electrode and the row electrode pair of the discharge space intersect, and partitioned by the partition The phosphor layer formed in the unit light emitting region is provided, the partition wall has a substantially lattice shape having a horizontal wall extending in the row direction and a vertical wall extending in the column direction, and the phosphor layer is provided for each unit light emitting region. In the plasma display panel in which phosphor layers of different colors formed by at least three different color phosphors are sequentially arranged in the row direction, any of the intersecting portions of the portions where the horizontal wall and the vertical wall of the partition intersect Opposite to one substrate side Are bonded layer is formed only on the surface, a PDP that secure together the one substrate and the other substrate by the adhesive layer adheres to one substrate side to the embodiment of the broader concept.

  According to the PDP of this embodiment, in the display area of the PDP, the two substrates facing each other through the discharge space are fixed to each other by the adhesive layer formed on the partition wall, so that the driving of the PDP Sometimes, the substrate is prevented from vibrating and driving noise is generated, and an adhesive layer for fixing the two substrates to each other in the display area of the PDP is provided at any of the intersections between the horizontal wall and the vertical wall of the partition wall. Since the material for forming the adhesive layer can be reduced as compared with the conventional PDP in which the adhesive layer is formed on the entire surface of the partition wall, the adhesive layer is made of, for example, a glass frit material. When the adhesive layer is heated and welded to one substrate side in the PDP manufacturing process, the discharge space is contaminated by impure gas generated from the adhesive layer. Can discharge characteristics of the PDP is prevented.

It is a front view which shows PDP of the 1st Example in embodiment of this invention. It is sectional drawing in the HH line of FIG. 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 V3-V3 line | wire of FIG.

Explanation of symbols

1 ... Front glass substrate (one substrate)
2 ... Dielectric layer 3 ... Protective layer 4 ... Back glass substrate (the other substrate)
6 ... partition wall 6A ... horizontal wall 6A1 ... first horizontal wall 6A2 ... second horizontal wall 6B ... vertical wall 6B1 ... first vertical wall 6B2 ... second vertical wall 6B3 ... third vertical wall 6A1a ... intersecting portion 7 ... phosphor layer 7 (R ) ... Red phosphor layer 7 (G) ... Green phosphor layer 7 (B) ... Blue phosphor layer 8 ... Sealing layer C ... Discharge cell (unit emission region)
C (R): Red discharge cell (unit emission region)
C (G): Green discharge cell (unit emission region)
C (B) ... Blue discharge cell (unit emission region)
X ... row electrode (second row electrode)
Y: Row electrode (first row electrode)
Xa, Ya ... bus electrode Xb, Yb ... transparent electrode

Claims (9)

A pair of substrates are opposed to each other through the discharge space, and a plurality of row electrode pairs extending in the row direction and arranged in parallel in the column direction are provided on one substrate side, and extending in the column direction on the other substrate side. A plurality of column electrodes arranged in parallel to each other, a partition partitioning a unit light emitting region formed at a portion where a column electrode and a row electrode pair of the discharge space intersect, and a unit light emitting region partitioned by the partition The phosphor layer has a substantially lattice shape in which the partition wall has a horizontal wall extending in the row direction and a vertical wall extending in the column direction, and the phosphor layer is different in each unit light emitting region. In the plasma display panel in which the phosphor layers of different colors formed in order are arranged in the row direction,
An adhesive layer is formed only on the surface facing the one substrate side of an arbitrary intersecting portion of the portions where the horizontal wall and the vertical wall of the partition intersect, and this adhesive layer adheres to one substrate side to A plasma display panel, wherein the substrate and the other substrate are fixed to each other.   The phosphor layer is formed of fluorescent materials having different colors of the first color, the second color, and the third color for each unit light emitting region, and the first color of the intersecting portion of the horizontal wall and the vertical wall of the partition wall And the area of the intersection of the vertical wall and the horizontal wall located between the adjacent unit light emitting regions where the phosphor layers of the second color are formed is larger than the other intersections, and this area becomes larger The plasma display panel according to claim 1, wherein an adhesive layer is formed only on the surface of the intersecting portion.   3. The plasma display panel according to claim 2, wherein the phosphor material of the third color has the highest luminance among the phosphor materials of the first color, the second color, and the third color.   3. The plasma display panel according to claim 2, wherein the phosphor material of the third color has the lowest luminance among the phosphor materials of the first color, the second color, and the third color.   The phosphor material forming the phosphor layer has three colors of red, green, and blue, and between the unit light emitting region in which the red phosphor layer is formed and the unit light emitting region in which the blue phosphor layer is formed. The plasma display panel according to claim 2, wherein the area of the intersecting portion between the vertical wall and the lateral wall located at is larger than that of the other intersecting portions.   The unit light emitting regions are arranged in the column direction for each color of the phosphor layer, and a blue phosphor layer is formed between the unit light emitting regions in which the red phosphor layers adjacent in the column direction of the horizontal wall are formed. 6. The plasma according to claim 5, wherein the width in the column direction of the portion located between the unit light emitting regions is larger than the width of the portion located between the unit light emitting regions on which the green phosphor layers are formed. Display panel.   The row electrode pair includes a first row electrode that generates a discharge with a column electrode across a unit light emitting region, and a second row electrode that generates a discharge with the first row electrode. The first row electrode and the second row electrode of the electrode pair are alternately arranged between adjacent row electrode pairs, and the first row electrodes and the second row electrodes are respectively positioned back to back, The lateral walls of the partition walls are respectively disposed at positions facing the first row electrodes or the second row electrodes located adjacent to each other in adjacent row electrode pairs, and facing the first row electrodes located back to back. The plasma display panel according to claim 1, wherein an adhesive layer is formed only on the surface of the intersecting portion of the vertical walls. The spacing between adjacent adhesive layers is
f = (22 / 2πL ² ) × √ (Eh ² / 12ρ)
L: Distance between adhesive layers
f: natural frequency
E: Young's modulus of the substrate
h: thickness of substrate
2. The plasma display panel according to claim 1, wherein the natural frequency is set to a value larger than 20 kHz based on an equation of ρ: substrate density. The spacing between adjacent adhesive layers is
f = (22 / 2πL ² ) × √ (Eh ² / 12ρ)
L: Distance between adhesive layers
f: natural frequency
E: Young's modulus of the substrate
h: thickness of substrate
2. The plasma display panel according to claim 1, wherein the natural frequency is set to a value larger than 4 kHz based on the equation of ρ: substrate density.

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