JP2010062084A - Plasma display panel and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP capable of repairing defects without deteriorating image quality and partial loss of image even when abnormal lighting cells are caused numerously or in a high density, and even when a region display spot appears, and method of manufacturing the same. <P>SOLUTION: In the plasma display panel equipped with a front face substrate consisting of a transparent electrode and a metal electrode of a narrower width than that of the transparent electrode, and equipped with a display electrode extending in one direction, and a backside substrate which is opposed to the front face substrate and equipped with an address electrode that is extending in a direction different from that of the display electrode and forms a plurality of cells in a crossing part with the display electrode, and in the plurality of cells, a cell is included which has a part higher in resistance of the transparent electrode than those of surroundings, and emits light of the same brightness as that of the other cells. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel and a manufacturing method thereof, and more particularly, to a plasma display panel in which abnormally lighted cells or area display spots are eliminated and a manufacturing method thereof.

  A plasma display panel (PDP) is a type of flat display device using light emission by discharge.

  A PDP is a display device in which a glass front substrate and a back substrate are bonded to each other with a small space, and a rare gas such as xenon is sealed in this space.

  The front substrate of the PDP is provided with a plurality of display electrodes that are formed by a transparent electrode and a metal electrode (bus electrode) narrower than the transparent electrode and extend in the horizontal direction. On the other hand, the back substrate is provided with a plurality of address electrodes extending in a direction orthogonal to the display electrodes.

  The display electrode and the address electrode intersect to form a plurality of cells, and a discharge is generated by the voltage applied to the display electrode, and each cell emits light. Thus, the emitted light cell becomes one pixel, and an image is displayed on the surface of the PDP.

By the way, when a PDP completed as a panel is observed, a cell that shines brighter than other cells may be found. Such an abnormally lighted cell is very conspicuous, and the PDP cannot be shipped as it is. In view of this, a technique has been developed in which abnormally lit cells are unlit by irradiating the abnormally lit cells with laser light and increasing the resistance of the transparent electrode (Patent Document 1).
JP 2004-31042 A

  However, when the number of abnormally lit cells is large, or when abnormally lit cells are densely packed, if the abnormally lit cells are turned off as in the above-described prior art, the image quality is deteriorated.

  In addition, as a mode of the phenomenon that some cells shine brighter than other cells, in addition to abnormally lit cells, cells that emit light brighter than other cells occur densely and occupy a certain area. There is an area display spot. If cells included in such area display spots are turned off, a part of the image is lost. Therefore, it is difficult to deal with the area display spots with the above-described non-lighting technique.

  Therefore, the object of the present invention is to eliminate these defects without causing deterioration of image quality or partial omission of images even when a large number of abnormally lit cells or a clustered area occur or when an area display spot occurs. To provide a PDP that can be repaired (repaired) and a method of manufacturing the same.

  According to a first aspect of the present invention, there is provided a front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, facing the front substrate, and the display electrode And a back substrate having an address electrode that forms a plurality of cells at intersections with the display electrode, the transparent electrode being included in the plurality of cells. This is a plasma display panel that includes a cell having a higher resistance than the surrounding cell and emitting light with the same brightness as other cells.

  According to a second aspect of the present invention, there is provided a front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, and facing the front substrate, the display electrode A plasma display panel comprising a back substrate having address electrodes extending in a different direction and forming a plurality of cells at intersections with the display electrodes, wherein the light transmittance of the transparent electrode is the other The plasma display panel is a plasma display panel in which the cells lower than the cell have a dense area, and the cells in the area shine with the same brightness as the other cells.

  According to a third aspect of the present invention, there is provided a front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, and facing the front substrate, the display electrode A first step of forming a plasma display panel comprising a back substrate having address electrodes extending in a different direction from each other and forming a plurality of cells at intersections with the display electrodes; and a plurality of the cells A second step of partially increasing the resistance of the transparent electrode of the display electrode that forms the abnormally lit cell when an abnormally lit cell that emits light brighter than the other cells is generated. It is a manufacturing method of a plasma display panel.

  According to a fourth aspect of the present invention, there is provided a front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, facing the front substrate, and the display electrode A first step of forming a plasma display panel comprising: a back substrate having an address electrode extending in a different direction from the display electrode and forming a plurality of cells at intersections with the display electrode; and And a second step of reducing the light transmittance of the transparent electrode of the cell existing in the region when the region where the cells emitting light brighter than the other cell are densely formed is formed. A display panel manufacturing method.

  According to the present invention, when the number of abnormally lit cells is large, when abnormally lit cells are densely formed, or when an area display spot is generated, a cell that shines brighter than other cells is the same as other cells. Since repair is made so that light is emitted at brightness, these cell defects can be dealt with without causing deterioration in image quality or partial omission of the image.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

(Embodiment 1)
Even if a large number of abnormally lit cells or densely generated or area display spots occur, if it is possible to emit abnormally lit cells or cells in the area display spots with the same brightness as other cells, These defects can be repaired without degrading the quality of the displayed image.

  Based on this idea, this embodiment repairs (repairs) abnormally lit cells so that they emit light with the same brightness as other cells. The present invention relates to a PDP and a method for manufacturing the same.

(1) Configuration FIG. 1 is a plan view illustrating a configuration of a PDP according to the present embodiment.

  FIG. 2 is an enlarged view of a region A surrounded by a broken line in FIG. In the following, even if the drawings are different, the corresponding parts are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 1 and FIG. 2, PDP 2 according to the present embodiment extends along one long side of transparent electrode 4 extending in one direction (for example, the horizontal direction). A front substrate 13 having a display electrode 12 composed of a narrow metal electrode 6 (bus electrode 22) is provided. Here, the display electrode 12 includes a pair of scan electrodes 8 and sustain electrodes 10.

  In addition, the PDP 2 of the present embodiment faces the front substrate 13, further extends in a direction different from the display electrode 12 (for example, the vertical direction), and has a plurality of cells 14, intersecting with the display electrode 12. A back substrate 19 having address electrodes 18 forming 16 is provided. In FIG. 2, the cells 14 and 16 are alternately surrounded by broken lines and denoted by reference numerals so that the drawing is not complicated. Here, unlike the other cells 14, the cell 16 has a portion 20 in which the resistance of the transparent electrode 4 is higher than that of the surrounding transparent electrode 21.

  As described above, the PDP 2 according to the present embodiment includes the transparent electrode 4 and the metal electrode 6 (bus electrode 22) having a narrower width than the transparent electrode 4, and the front substrate including the display electrode 12 extending in one direction. 13 is provided. In addition, the PDP 2 according to the present embodiment has an address electrode 18 that faces the front substrate 13, extends in a direction different from the display electrode 12, and forms a plurality of cells 14 and 16 at intersections with the display electrode 12. And a back substrate 19 provided.

  Furthermore, the PDP 2 of the present embodiment includes a cell 16 that has a portion 20 in which the resistance of the transparent electrode 4 is higher than that of the surrounding cells and emits light with the same brightness as the other cells 14 among the plurality of cells. ing.

  FIG. 3 is an enlarged view of the cell 16 shown in FIG.

  In the example shown in FIG. 3, the transparent electrode 4 forming the scan electrode 8 and the sustain electrode 10 has two portions 20 each having a higher resistance than the surrounding transparent electrode 21.

  The cell 16 is a cell that has been repaired from an originally abnormally lit cell and emits light with the same brightness as the other cells 14.

  When the portion 20 having a higher resistance than the periphery 21 is formed in the transparent electrode 4, the discharge area of the cell is reduced accordingly. As a result, the amount of plasma generated by the cell 16 is also reduced. For this reason, the cell 16 that is an abnormally lit cell has a reduced luminance and emits light with the same brightness as the other cells 14. Therefore, a large number of non-lighting points are formed densely and image quality is not deteriorated.

  As described above, in the PDP 2 according to the present embodiment, the abnormally lit cell 16 is repaired so as to shine with the same brightness as the other cells 14. Therefore, according to the PDP 2 of the present embodiment, even when a large number of abnormally lit cells occur or when they occur densely, these defects are dealt with without degrading the quality of the displayed image. be able to.

  Note that one cell emits light with the same brightness as the other cells means that there is no difference in the brightness perceived by the PDP observer when both cells emit light under the same conditions.

(2) Manufacturing method Next, the manufacturing method of such PDP2 is demonstrated.

  FIG. 4 is a perspective view for explaining the manufacturing method of the PDP according to the present embodiment.

  In the present embodiment, first, the transparent electrode 4 and the metal electrode 6 (bus electrode 22) are formed on the first glass substrate 23 in accordance with a normal PDP manufacturing procedure. Next, a dielectric layer 24 made of glass and a protective layer 26 made of MgO are laminated on the transparent electrode 4 and the bus electrode 22.

  The bus electrode 22 is for facilitating current flow through the transparent electrode, and is formed of a low-resistance metal film such as Cr—Cu—Cr. On the other hand, the transparent electrode 4 for securing a discharge area and efficiently extracting light generated by the discharge is formed of an electrode material such as ITO (Indium Tin Oxide) which has a relatively high resistance but is transparent. . In this way, the front substrate 13 is formed.

  The transparent electrode 4 and the bus electrode 22 form the scan electrode 8 and the sustain electrode 10 to become the display electrode 12. A plurality of the display electrodes 12 are formed so as to extend in the horizontal direction.

  Next, a strip-shaped address electrode 18 made of metal is formed on the second glass substrate 25. As shown in FIG. 4, a plurality of address electrodes 18 are formed so as to extend in the vertical direction.

  Next, a dielectric layer 28 made of glass is formed on the address electrode 18. On the dielectric layer 28, a band-shaped partition wall 30 is formed between the adjacent address electrodes 18. Further, a phosphor 32 is applied from the top of the dielectric layer 28 to the side surface of the partition wall 30. In this way, the back substrate 19 is formed.

  Next, the front substrate 13 and the rear substrate 19 are arranged to face each other so that the display electrodes 12 and the address electrodes 18 are orthogonal to each other, and the peripheral portion is sealed with a sealing member, and neon is formed in the space formed between the two substrates. And a rare gas containing xenon. At this time, a plurality of cells are formed at the intersection of the display electrode 12 and the address electrode 18.

  Through the above steps, first, the front substrate 13 including the transparent electrode 4 and the metal electrode 6 narrower than the transparent electrode 4 and having the display electrode 12 extending in one direction is opposed to the front substrate 13. The pre-repair plasma display panel 3 is formed which includes a back substrate 19 provided with address electrodes 18 extending in a direction different from the display electrodes 12 and forming a plurality of cells at intersections with the display electrodes 12.

  In order to display an image on the PDP 3, a voltage pulse is applied between the address electrode 18 and the display electrode 12 that intersect at a cell to emit light to cause discharge. Due to this discharge, wall charges are accumulated in the protective film 26 covering the display electrode 12.

  In this state, when an alternating voltage pulse is applied between all the scan electrodes 8 forming the display electrode 12 and the sustain electrode 10, a sustain discharge occurs only in the cell in which the wall charges are accumulated.

  By this discharge, the rare gas filled in the cell is excited to emit ultraviolet light. The phosphor 32 is excited by the ultraviolet light to emit light, and an image is displayed on the PDP 3.

  At this time, abnormally lit cells that emit light much brighter than other cells may occur.

  FIG. 5 is a perspective view for explaining a method of repairing (repairing) the brightness of such abnormally lit cells 34 in the same manner as other cells.

  Here, a part or a plurality of parts of the transparent electrode 4 of the display electrode 12 forming the abnormally lit cell 34 is irradiated with the laser beam 38 generated by the laser beam irradiation unit 36 to increase the resistance. When the laser beam 38 is irradiated, the transparent electrode changes color and the resistance becomes higher than that of the surrounding 21. The portion 20 having a higher resistance than the periphery 21 shown in FIG. 3 is a region formed in this manner. Note that the laser beam 38 is irradiated through the first glass substrate 23 that forms the front substrate 13.

  In a cell subjected to such laser processing, even when a voltage pulse is applied between the scan electrode 8 and the sustain electrode 10, a strong electric field that causes discharge is not generated from the high resistance portion 20. . For this reason, the area (discharge area) of the transparent electrode which contributes to discharge becomes small. As a result, the luminance of the abnormally lit cell decreases, and the abnormally lit cell and other cells emit light with the same brightness.

  That is, in this embodiment, when an abnormally lit cell 34 that emits light brighter than other cells is generated in a plurality of cells, the transparent electrode 4 of the display electrode 12 that forms the abnormally lit cell 34 is partially set. The resistance is increased to emit light with the same brightness as other cells.

  As a light source (laser light irradiation unit 36) for partially increasing the resistance of the transparent electrode 4, a neodymium yag laser (Nd: YAG) that performs Q-switch operation can be used. The wavelength used is 355 nm, and the output energy is, for example, 0.6 mJ. The pulse width is 3 to 4 ns, for example, and the repetition period is 1 to 50 Hz.

  The wavelength 355 nm is a wavelength absorbed by the transparent electrode 4. A laser beam having another wavelength may be used as long as the transparent electrode 4 absorbs the wavelength. However, a wavelength that is not absorbed by the first glass substrate 23 is preferable.

  In the present embodiment, as shown in FIG. 5, the laser light 38 generated by such a light source (laser light irradiation unit 36) is focused on a rectangular region having a width of several tens of μm, for example, and irradiated onto the transparent electrode 4. To do. In the example shown in FIG. 3, the resistance of the transparent electrode 4 of the scanning electrode 8 and the sustaining electrode 10 is increased at two locations. However, the portion to be increased in resistance need not be two places, and may be one place or three places or more.

  As described above, according to the present embodiment, even when a large number of abnormally lit cells occur or when they occur in a dense manner, the abnormally lit cells are repaired so that they glow with the same brightness as other cells. The quality of the image displayed on the PDP does not deteriorate.

(Embodiment 2)
The present embodiment relates to a PDP in which area display spots are repaired (repaired) to normal brightness, and a method for manufacturing the PDP.

(1) Configuration FIG. 6 is a plan view illustrating the configuration of PDP 40 according to the present embodiment. In FIG. 6, display electrodes and the like are omitted.

  A PDP 40 according to the present embodiment includes a transparent electrode 4 and a metal electrode 6 (bus electrode 22) having a narrower width than the transparent electrode 4 as in the case of the PDP 2 of the first embodiment, and extends in one direction. A front substrate 13 having 12 is provided. Further, the PDP 40 according to the present embodiment has a back surface provided with address electrodes 18 that face the front substrate 13, extend in a direction different from the display electrodes 12, and form a plurality of cells at intersections with the display electrodes 12. A substrate 19 is provided (see FIGS. 1 and 2). Here, the details of the front substrate 13 and the back substrate 19 are the same as those of the front substrate 13 and the back substrate 19 of the first embodiment described with reference to FIG.

  As shown in FIG. 6, PDP 40 according to the present embodiment has a region 42 in which a plurality of cells whose light transmittance of the transparent electrode is lower than other cells are dense. FIG. 7 is an enlarged view of the rectangular area A shown in FIG. The light transmittance of the transparent electrode 44 of the cell 46 existing in the region A is lower than the transparent electrode of other cells outside the region 42.

  The area 42 is an area where the area display spots that originally emitted light brighter than the surrounding area are repaired (repaired) so that the area 42 shines with the same brightness as the surrounding area.

  When the light transmittance of the transparent electrode (ratio of the intensity of transmitted light to the intensity of incident light) becomes low, the light generated inside the cell becomes difficult to be emitted to the outside, and the brightness of the cell decreases. Therefore, in the present embodiment, the cells in the region 42 that were originally the region display spots emit light with the same brightness as other cells due to the decrease in the light transmittance of the transparent electrode. Yes.

  Therefore, according to the PDP 40 of the present embodiment, even when an area display spot occurs, the area display spot can be repaired without causing a loss in the displayed image.

(2) Manufacturing Method The manufacturing method of the PDP 40 according to the present embodiment is the same as that of the first embodiment until the step of sealing the peripheral portions of the front substrate 13 and the rear substrate 19 and sealing the rare gas between the substrates. It is the same as the manufacturing method of PDP2. Therefore, in the present embodiment, only the subsequent process following the above process will be described.

  FIG. 8 is a perspective view illustrating a method for manufacturing PDP 40 according to the present embodiment.

  In the present embodiment, when a region (region display spot 50) where cells emitting light brighter than other cells are densely generated in the plasma display panel 48 before repair, the transparency of the cells existing in this region is transparent. The electrode is irradiated with laser light to reduce the light transmittance of the transparent electrode. The laser beam 38 is irradiated through the first glass substrate 23 that forms the front substrate 13 as in the first embodiment.

  The wavelengths of the laser beam irradiation unit 36 and the laser beam 38 used in the present embodiment are the same as those used in the first embodiment.

  However, the laser light 38 used in the present embodiment has weaker illuminance on the transparent electrode than the laser light used in the first embodiment. For this reason, in this embodiment, the cells that have been irradiated with the laser do not turn off. Further, the discharge area of the cell does not decrease.

  Furthermore, the irradiation area of the laser beam 38 used in this embodiment is larger than the irradiation area of the embodiment and is substantially the same as the cell.

  When the illuminance of the laser beam 38 is high, the resistance of the transparent electrode becomes so high that measurement is impossible. When such a laser beam is applied to the entire cell, the cell is turned off.

  However, if the illuminance of the laser light is reduced, the cell will eventually not be turned off. However, the light emission intensity (luminance) of the cell at that time is weaker than before laser irradiation. The decrease in emission intensity is due to a decrease in the light transmittance of the transparent electrode.

  For example, when the light intensity of the laser beam 38 is 30 candela and the irradiation region is a rectangular region of 400 μm × 280 μm which is substantially the same as one cell, and the transparent electrode is irradiated with the laser beam, the irradiated cell is not turned off, Its brightness decreases. The laser light irradiation conditions (for example, output energy) other than the luminous intensity and the irradiation region are the same as the laser light irradiation conditions of the first embodiment.

  In the present embodiment, such laser irradiation is performed on the entire cell in the region display spot 50 to reduce the light transmittance of the transparent electrode 44 of the cell (see FIG. 7). Accordingly, the cells in the area display spot 50 that emit light brighter than other cells emit light at the same brightness as the other cells with reduced brightness.

  Therefore, according to the present embodiment, it is possible to repair the region display spots without causing a loss in the displayed image.

  In the above example, the case where there are many cells that shine brighter than other cells has been described, but the present invention can also be applied to the case where there are a small number of such cells (for example, abnormally lit cells).

3 is a plan view illustrating a configuration of a PDP according to the first embodiment. FIG. It is the figure which expanded the area | region A enclosed with the broken line in FIG. It is the figure which expanded further the cell 16 shown in FIG. FIG. 5 is a perspective view for explaining the method for manufacturing the PDP according to the first embodiment. It is a perspective view explaining the method of repairing (repairing) the brightness of an abnormally lighted cell similarly to another cell. 6 is a plan view illustrating a configuration of a PDP according to a second embodiment. FIG. FIG. 7 is an enlarged view of a rectangular area A shown in FIG. 6. It is a perspective view explaining the manufacturing method of PDP according to this Embodiment 2. FIG.

Explanation of symbols

2 ... PDP (Embodiment 1) 3 ... PDP (before repair)
DESCRIPTION OF SYMBOLS 4 ... Transparent electrode 6 ... Metal electrode 8 ... Scan electrode 10 ... Sustain electrode 12 ... Display electrode 13 ... Front electrode 14, 16 ... Cell 18 ... Address electrode 19 ... Back substrate 20 ... Part of transparent electrode 22 (high resistance) ... Bus electrode 23 ... First glass substrate 24 ... Dielectric layer 25 (on front substrate) .... Second glass substrate 26 ... Protective layer 28 ... Dielectric 30 (back substrate) ... Partition 32 ... Phosphor 34 ... Abnormally lit cell 36 ... Laser light irradiation unit 38... Laser light 40... PDP (Embodiment 2)
42... Region 44... (Low light transmittance) transparent electrode 46... (Low light transmittance of transparent electrode) cell 48... (Before repair) PDP 50.

Claims (7)

A front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, and comprising a display electrode extending in one direction;
In a plasma display panel comprising a back substrate facing the front substrate, extending in a direction different from the display electrodes, and provided with address electrodes forming a plurality of cells at intersections with the display electrodes,
The plasma display panel, wherein the plurality of cells include a cell having a portion where the resistance of the transparent electrode is higher than that of the surrounding cells and emitting light with the same brightness as other cells. A front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, and comprising a display electrode extending in one direction;
In a plasma display panel comprising a back substrate facing the front substrate, extending in a direction different from the display electrodes, and provided with address electrodes forming a plurality of cells at intersections with the display electrodes,
The transparent electrode has a region where the cells are denser than the other cells,
The plasma display panel in which the cells in the region shine with the same brightness as the other cells. A front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, and facing the front substrate, extending in a direction different from the display electrode; A first step of forming a plasma display panel comprising a back substrate having an address electrode that forms a plurality of cells at intersections with the display electrode;
When an abnormally lit cell that emits light brighter than the other cells occurs in the plurality of cells, the second electrode that partially increases the resistance of the transparent electrode of the display electrode that forms the abnormally lit cell Comprising steps,
A method for manufacturing a plasma display panel. In the manufacturing method of the plasma display panel of Claim 3,
The second step is a step of increasing the resistance by irradiating a part or a plurality of portions of the transparent electrode of the abnormally lit cell with a laser beam.
A method for manufacturing a plasma display panel. A front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, and facing the front substrate, extending in a direction different from the display electrode; A first step of forming a plasma display panel comprising a back substrate having an address electrode that forms a plurality of cells at intersections with the display electrode;
A second step of lowering the light transmittance of the transparent electrode of the cell existing in the area when the plasma display panel has an area where the cells emitting light brighter than the other cells are densely formed; Comprising
A method for manufacturing a plasma display panel. In the manufacturing method of the plasma display panel of Claim 5,
The second step is a step of irradiating the transparent electrode of the cell existing in the region with laser light.
A method for manufacturing a plasma display panel. A front substrate comprising a transparent electrode and a metal electrode having a narrower width than the transparent electrode, the display substrate extending in one direction, and facing the front substrate, extending in a direction different from the display electrode; A first step of forming a plasma display panel comprising a back substrate having an address electrode that forms a plurality of cells at intersections with the display electrode;
A second step of repairing the cells that emit light brighter than the other cells to emit light at the same brightness as the other cells;
A method for manufacturing a plasma display panel.

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