JP2006004647A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel with high luminance, having no cracks or separation of the phosphor layer, and easy in exhaust of impurity gases. <P>SOLUTION: This is the plasma display panel in which a front substrate 10 having a display electrode composed of a scanning electrode 12 and a sustaining electrode 13 and a back substrate 20 having a data electrode 22 and a barrier rib 24 and a phosphor layer 25 are arranged opposed to each other so that the display electrode and the data electrode 22 may cross each other. The barrier ribs 24 are formed in parallel cross shape by a vertical barrier rib 24a in parallel with the data electrode 22 and a horizontal barrier rib 24b in parallel with the display electrode, and the phosphor layers 25 are formed continuously crossing over at least the crowning of the horizontal barrier rib 24b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plasma display panel, and more particularly to the structure of the phosphor layer.

  2. Description of the Related Art In recent years, color display devices using plasma display panels (hereinafter referred to as PDPs) in color display devices used in image display devices such as computers and televisions are capable of realizing a large, thin and light color display. It is attracting attention as a device.

  In the PDP, a front substrate made of a glass substrate formed by arranging scan electrodes and sustain electrodes for performing surface discharge and a rear substrate made of a glass substrate formed by arranging data electrodes so that both electrodes form a matrix. In addition, they are arranged in parallel so as to form a discharge space in the gap, and the outer peripheral portion thereof is sealed with a sealing material such as glass frit.

  Discharge cells partitioned by barrier ribs are provided between the front substrate and the rear substrate, and a phosphor layer is formed in the discharge cell space between the barrier ribs. In the PDP having such a configuration, color display is performed by generating ultraviolet rays by gas discharge and exciting the phosphors of red, green, and blue colors with the ultraviolet rays to emit light (for example, Patent Document 1). .

  FIG. 5 is an exploded perspective view showing the structure of such a conventional PDP. As shown in FIG. 5, the PDP includes a front substrate 50 and a rear substrate 51. In the front substrate 50, a plurality of pairs of scanning electrodes 53 and sustain electrodes 54 are arranged in parallel to each other on the front glass substrate 52 to form display electrodes, and the dielectric layers 55 cover the display electrodes. The structure is covered with a protective film 56 made of MgO. On the other hand, in the rear substrate 51, a plurality of data electrodes 58 orthogonal to the scanning electrodes 53 are arranged on the rear glass substrate 57, and a dielectric layer 59 is coated thereon. Further, a plurality of parallel barrier ribs 60 forming a discharge space are formed, and red, green, and blue phosphor layers 61 are sequentially formed on the side surfaces of the dielectric layer 59 and the barrier ribs 60.

  A discharge gas such as neon or xenon is sealed in the discharge space and sealed at a pressure of 53 kPa to 80 kPa. In the PDP having such a configuration, a plasma discharge is generated between the electrodes, and the phosphor layer 61 is irradiated with ultraviolet rays generated from a discharge gas sealed in the discharge space, whereby each color of red, green, and blue is changed. Can emit light. During light emission, the partition wall 60 plays a role of preventing crosstalk between unit light emitting regions.

As described above, a plurality of parallel barrier ribs have been used as the barrier rib structure. In recent years, a grid-shaped barrier rib structure as shown in FIG. 6 has been proposed in order to increase the luminance (for example, Patent Documents). 2). In this configuration, in addition to the partition wall 60 shown in FIG. 5, a horizontal partition wall 65 parallel to the scan electrode 53 and the sustain electrode 54 is further provided. By adding the horizontal barrier ribs 65 in this manner, the phosphor layer 61 is also formed on the side surfaces of the horizontal barrier ribs 65 to increase the area of the phosphor layer 61 and improve the brightness, and adjacent to each other by partitioning the discharge cells. This prevents erroneous discharge with the discharge cell.
JP 2001-195990 A JP 2000-195431 A

  However, in the conventional PDP having a grid-shaped partition wall, the adhesion between the phosphor layer, the substrate and the partition wall is weak, and the phosphor layer is cracked or peeled off. That is, in the case of a cross-shaped partition wall, the interface between the side wall of the partition wall and the phosphor layer increases near the top of the partition wall as compared with the case of only the conventional striped partition wall, and the separation start point of the phosphor layer increases. In addition, when the phosphor layer is formed by screen printing or nozzle discharge coating method, it is necessary to remove the phosphor adhering to the top of the partition wall, and at that time, the phosphor layer is peeled off from the side surface of the partition wall. To encourage. Furthermore, in the case of a grid-shaped barrier rib, the phosphor itself generates non-uniform thermal stress when receiving a thermal history such as a firing process or a sealing process of the phosphor layer, and the phosphor adhered to the barrier rib A stress is generated that exfoliates the layer. Therefore, in the case of a cross-shaped partition wall, the phosphor layer is likely to be peeled off or cracked due to these factors, and there are problems such as lowering the PDP luminance and deteriorating display quality.

  Further, it has been found that the phosphor layer can improve the light emission efficiency as it approaches the plasma discharge. However, the phosphor layer formed in the vicinity of the top of the barrier rib has a weak adhesion as described above, and when it comes into contact with the front substrate, it cannot be brought close to plasma discharge in order to further promote the separation, thereby improving the luminance. There is a problem that cannot be done.

  In addition, in the PDP having a cross-shaped partition wall, there is a problem that when the impurity gas is exhausted in an exhaust process or the like, the flow path is narrow and thus the exhaust gas is not exhausted sufficiently.

  The present invention solves the above problems, increases the area of the phosphor layer, improves the brightness by bringing the phosphor layer closer to the plasma discharge, does not crack or peel off the phosphor layer, and facilitates the exhaust of impurity gases. An object is to provide a PDP.

  In order to solve the above-described problems, the PDP of the present invention is configured so that the display electrode and the data electrode intersect the front substrate provided with the display electrode, the data electrode, and the rear substrate provided with the barrier rib and the phosphor layer. In the PDP arranged oppositely, the barrier ribs are formed in a cross-beam shape by the vertical barrier ribs parallel to the data electrodes and the horizontal barrier ribs parallel to the display electrodes, and the phosphor layer is continuously formed across the top of the horizontal barrier ribs. Yes.

  According to such a configuration, the area of the phosphor layer is increased, the luminance is improved, and the phosphor layer is continuously formed beyond the cell, so that a PDP without cracking or peeling of the phosphor layer is realized. can do.

  Furthermore, it is desirable that the height of the horizontal barrier ribs be smaller than that of the vertical barrier ribs, and the vertical barrier ribs and the horizontal barrier ribs are made to have the same height by the phosphor layer formed on the horizontal barrier ribs, so that crosstalk between adjacent discharge cells is achieved. Can be suppressed.

  Further, it is desirable that the height of the horizontal barrier rib including the phosphor layer on the top is equal to or lower than the height of the vertical barrier rib, so that the phosphor layer formed on the top of the horizontal barrier rib is not in contact with the front substrate. The peeling of the body layer can be prevented.

  Furthermore, when the front substrate and the rear substrate are disposed to face each other, it is desirable to have a gap between the top of the horizontal partition and the front substrate. According to such a configuration, the front substrate and the rear substrate are arranged. When sealing and evacuating the substrate, it is possible to facilitate the evacuation of the cross-shaped discharge cells by the gaps, and the impurity gas can be evacuated.

  Further, it is desirable to form the void portion by the phosphor layer formed on the top of the horizontal barrier rib and the vertical barrier rib, and it is easy to exhaust by adjusting the width of the phosphor layer formed on the top of the horizontal barrier rib. A gap can be provided.

  Furthermore, a spacer member may be disposed on the top of the vertical partition wall. According to this configuration, the vertical partition wall and the horizontal partition wall can be made the same height to facilitate the manufacture of the cross beam partition wall.

  Furthermore, it is desirable that the spacer member is made of a black material, so that crosstalk to adjacent cells can be reduced and contrast can be improved.

  As described above, according to the present invention, a PDP having a grid-shaped partition wall in which the area of the phosphor layer is increased and the luminance is improved, the phosphor layer is not cracked or peeled off, and the impurity gas can be easily exhausted is realized. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 is an exploded perspective view of a PDP according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 1, the PDP includes a front substrate 10 and a rear substrate 20. The front substrate 10 includes a plurality of pairs of scanning electrodes 12 and sustain electrodes 13 arranged in parallel to each other on the front glass substrate 11 to form a display electrode, which is covered with a dielectric layer 14 and further MgO. The protective film 15 made of The scan electrode 12 and the sustain electrode 13 are configured by laminating bus electrodes 12b and 13b made of metal films on transparent electrodes 12a and 13a made of ITO, respectively.

  In the rear substrate 20, a plurality of data electrodes 22 orthogonal to the scanning electrodes 12 are arranged on a rear glass substrate 21, and a rear plate dielectric layer 23 is covered thereon. Further, on the back plate dielectric layer 23, a grid-shaped barrier rib 24 that forms the discharge space 30 is formed, and the red, green, and blue phosphor layers 25 are sequentially formed of the dielectric layer 23 and the grid-shaped barrier rib 24. It is the structure formed in the side surface. The front substrate 10 and the back substrate 20 are sealed with a sealing member such as a glass frit, and a discharge gas such as neon or xenon is injected into the discharge space 30 formed by the barrier ribs 24. It is sealed at a pressure of 53 kPa to 80 kPa.

  In the PDP having such a configuration, plasma discharge is generated between the display electrodes, and the phosphor layer 25 is irradiated with ultraviolet rays generated from the discharge gas sealed in the discharge space 30, whereby red, green, blue Each color can be made to emit light. As described above, according to the embodiment of the present invention, since the partition wall 24 has a cross beam shape, the area of the phosphor layer 25 is smaller than that of the conventional parallel partition structure shown in FIG. Since it spreads, a high-luminance PDP can be realized. In addition, since each discharge cell is partitioned by a cross-shaped partition wall, it is possible to prevent erroneous discharge with an adjacent discharge cell.

  Further, the cross-shaped partition wall 24 includes a vertical partition wall 24a parallel to the data electrode 22 and a horizontal partition wall 24b orthogonal to the scan electrode 12 and the sustain electrode 13. As shown in FIG. 2, the horizontal barrier rib 24b is formed to be lower than the vertical barrier rib 24a. The phosphor layer 25 is continuously formed across at least the top 30 of the horizontal partition wall 24b.

  Such a cross-shaped partition wall 24 having vertical partition walls 24a and horizontal partition walls 24b having different heights can be formed by using a photolithography method or the like as a multilayer structure using a photosensitive material, for example. In addition, as a method of continuously forming the phosphor layer 25 across the top 30 of the horizontal barrier rib 24b, a known method such as a screen printing method using a phosphor paste or a nozzle discharge coating method can be used. is there. When applying between the barrier ribs 24 by these methods, it is possible to apply the phosphor paste with a slightly higher viscosity in order to suppress the flow of the phosphor paste riding on the horizontal barrier rib 24b.

  In a PDP having a grid-shaped partition wall, the adhesion between the phosphor layer and the partition wall is weak, and the phosphor layer is cracked or peeled off. That is, in the cross-shaped barrier rib, the interface between the side wall of the barrier rib and the phosphor layer is increased in the vicinity of the top of the barrier rib as compared with the conventional stripe-shaped barrier rib alone, and the separation start point of the phosphor layer is increased. In addition, when the vertical and horizontal bulkheads that make up the cross-shaped partition are the same height, when the front substrate is placed against the partition and the front and rear substrates are placed opposite to each other, the front and rear substrates are attached to the top of the partition. It is necessary to remove the phosphor, and in the removal process, the phosphor layer is exfoliated from the side wall of the partition wall, and a separation starting point is generated. In addition, when the barrier ribs are in the shape of a cross-beam, the phosphor layer is attached to the barrier ribs by generating uneven thermal stress in the barrier ribs themselves when receiving a thermal history such as a firing step or a sealing step of the phosphor layer. Stress to peel off is generated. Due to such factors, in particular, when the vertical and horizontal barrier ribs have the same height when the front substrate and the rear substrate are opposed to each other, defects such as peeling and cracking of the phosphor layer are likely to occur. Image display quality defects such as uneven brightness and non-lighting tend to occur.

  According to the embodiment of the present invention, as shown in FIGS. 1 to 3, the phosphor layer 25 forms the phosphor layer 25 b so as to straddle the top 30 of the transverse barrier rib 24 b, and is parallel to the data electrode 22. The phosphor layer 25 is continuously formed. Further, the height of the horizontal barrier ribs 24b on which the phosphor layer 25 is continuously formed is set lower than the height of the vertical barrier ribs 24a. Moreover, it is desirable that the thickness of the phosphor layer 25b formed on the top of the horizontal barrier rib 24b is the same as the difference in height between the vertical barrier rib 24a and the horizontal barrier rib 24b.

  Therefore, according to the embodiment of the present invention, when the front substrate 10 and the rear substrate 20 are arranged to face each other, it is not necessary to peel off and remove the phosphor layer 25b formed on the horizontal barrier rib 24b. Therefore, the separation starting point between the partition wall 24 and the phosphor layer 25 can be reduced. Further, since the phosphor layer 25 is continuously formed, the degree of adhesion to the partition wall 24 is increased. Therefore, even if the thermal history such as the firing process or the sealing process is subjected to non-uniform thermal stress, the phosphor layer 25 can be prevented from cracking or peeling. Further, since the thickness of the phosphor layer 25b formed on the top of the horizontal barrier rib 24b is the same as the height difference between the vertical barrier rib 24a and the horizontal barrier rib 24b, Crosstalk between discharge cells adjacent to each other in the direction of the data electrode 22 when the substrate 20 is disposed opposite to the substrate 20 can be suppressed.

  Further, the height of the horizontal barrier ribs 24b including the phosphor layer 25b formed on the top of the horizontal barrier ribs 24b is made smaller than the height of the vertical barrier ribs 24a, whereby the phosphor layer 25b formed on the top of the horizontal barrier ribs 24b. And the protective film 15 of the front substrate 10 are not in contact with each other, and the phosphor layer 25 can be prevented from peeling off. If the height of the horizontal barrier ribs 24b including the phosphor layer 25b is about 10 μm lower than that of the vertical barrier ribs 24a, the phosphor layer 25 can be peeled off while preventing crosstalk between adjacent discharge cells. I know it can be prevented.

  Further, in the embodiment of the present invention, as shown in FIG. 3, the width W5 of the phosphor layer 25b provided on the top of the horizontal barrier rib 24b is made smaller than the inner width W4 of the adjacent vertical barrier rib 24a, and the front substrate 10 and the top of the horizontal partition wall 24b. The size of the gap 26 can be determined so as to prevent crosstalk between adjacent discharge cells and secure an exhaust passage in the exhaust process after sealing the front substrate 10 and the rear substrate 20. . Therefore, it can be configured such that the impurity gas in the discharge cell can be easily discharged through the gap portion 26 and no crosstalk occurs in the exhaust process.

  Furthermore, according to the embodiment of the present invention, since the phosphor layer 25 can be provided close to the front substrate 10, the distance between the plasma discharge and the phosphor layer 25 can be shortened. For this reason, it is possible to increase the use efficiency of ultraviolet rays and increase the luminance.

(Second Embodiment)
FIG. 4 is an exploded perspective view of the PDP in the second embodiment of the present invention. The same components as those in FIG. In the embodiment of the present invention, the cross-shaped partition wall 24 forms a vertical partition wall 24a parallel to the data electrode 22 and a horizontal partition wall 24b orthogonal to the same at the same height. The phosphor layer 25 is continuously formed so as to straddle the horizontal barrier ribs 24 b orthogonal to the data electrodes 22. Therefore, the phosphor layer 25 is formed on the top surface of the horizontal barrier rib 24b.

  On the other hand, a phosphor layer is not formed on the upper surface of the barrier rib 24a parallel to the data electrode 22, and a spacer member 41 having the same thickness as the phosphor layer 25 formed on the top of the horizontal barrier rib 24a is provided on the top. Yes. Furthermore, the spacer member 41 is preferably formed of a black material. Such a spacer member 41 can be formed on the top of the horizontal barrier rib 24a by screen printing or nozzle coating after forming the phosphor layer 25 or before forming the phosphor layer 25. In addition, when the front substrate 10 and the back substrate 20 are arranged to face each other and the periphery thereof is sealed with a glass frit or the like, the spacer member 41 can be melted to join the front substrate 10 and the back substrate 20. .

  Also in such a configuration, a gap portion 26 is provided between the phosphor layer 25 provided on the top of the horizontal barrier rib 24 b and the front substrate 10.

  According to this configuration, the height of the vertical partition wall 24a and the horizontal partition wall 24b of the cross-shaped partition wall 24 can be made the same as in the first embodiment, so that the manufacture of the partition wall 24 is facilitated. Furthermore, the contrast of image display can be improved by making the spacer member 41 black. Furthermore, the front substrate 10 and the rear substrate 20 can be bonded by giving the spacer member 41 adhesiveness, and the gas pressure of the discharge gas to be sealed can be freely selected. Therefore, it is possible to achieve high efficiency discharge by optimizing the sealed gas pressure, and further to suppress deformation of the discharge cell and to suppress erroneous discharge and crosstalk.

  Also in the embodiment of the present invention, since the phosphor layer 25 is continuously provided across the horizontal barrier ribs 24b, peeling of the phosphor layer 25 is suppressed, and a high-quality and highly reliable PDP is realized. can do.

  According to the plasma display panel of the present invention, it is possible to realize a plasma display panel that has high brightness, does not break or peel off the phosphor layer, and can easily discharge impurity gas, and is useful for a large screen display device.

The disassembled perspective view of PDP in the 1st Embodiment of this invention AA sectional view of FIG. BB sectional view of FIG. The disassembled perspective view of PDP in the 2nd Embodiment of this invention Exploded perspective view of a conventional PDP Exploded perspective view of a conventional PDP

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front substrate 11 Front glass substrate 12 Scan electrode 12a, 13a Transparent electrode 12b, 13b Bus electrode 13 Sustain electrode 14 Dielectric layer 15 Protective film 20 Rear substrate 21 Rear glass substrate 22 Data electrode 23 Rear plate dielectric layer 24 Partition 24a Vertical Partition 24b Horizontal partition 25, 25b Phosphor layer 26 Gap 30 Top 41 Spacer member

Claims (7)

A plasma display panel in which a front substrate provided with a display electrode, a data electrode, a rear substrate provided with a partition and a phosphor layer are arranged to face each other so that the display electrode and the data electrode intersect with each other. A vertical barrier rib parallel to the data electrode and a horizontal barrier rib parallel to the display electrode are formed in a cross-beam shape, and the phosphor layer is continuously formed across the top of the horizontal barrier rib. Plasma display panel. 2. The plasma display panel according to claim 1, wherein the height of the horizontal barrier rib is smaller than the height of the vertical barrier rib. The plasma display panel according to claim 2, wherein the height of the horizontal barrier rib including the top phosphor layer is equal to or lower than the height of the vertical barrier rib. 3. The plasma display panel according to claim 1, wherein when the front substrate and the rear substrate are disposed to face each other, a gap is provided between a top of a horizontal partition wall and the front substrate. . 5. The plasma display panel according to claim 4, wherein the air gap is formed by a phosphor layer formed on the top of the horizontal barrier rib and a vertical barrier rib. The plasma display panel according to claim 1, wherein a spacer member is disposed on the top of the vertical partition wall. The plasma display panel according to claim 6, wherein the spacer member is a black material.

Images