JP2013152837A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make less conspicuous the boundary of regions on a display panel which is expanded by narrowing down the frame.SOLUTION: A plasma display panel comprises an effective display region including a front plate formed on a front substrate and a back plate formed on a back substrate and a non-display region formed on the outside of the effective display region. The non-display region includes a non-display region A having phosphor coated thereon and a non-display region B formed on the outside of the non-display region A and having no phosphor coated thereon. In the non-display region A, a second electrode has a divided portion and is extended from the effective display region. The area of first and second electrodes occupying a predetermined area of the non-display region B is 61% or more and 77% or less of the area of the first and second electrodes occupying a predetermined area in the effective display region. The electrode width of the first and the second electrodes in the non-display region B is 40% or more and 75% or less of the electrode width of the first and the second electrodes in the effective display region.

Description

  The present invention relates to a plasma display panel as a display device.

  Plasma display panels (hereinafter referred to as PDP) are roughly classified into AC type and DC type in terms of driving. There are two types of discharge, a surface discharge type and a counter discharge type, but at present, the mainstream of PDP is a surface discharge type with a three-electrode structure because of high definition, large screen, and ease of manufacturing. is there.

  In this surface discharge type PDP structure, at least a pair of substrates whose front sides are transparent are arranged to face each other so that a discharge space is formed between the substrates. A partition wall for partitioning the discharge space into a plurality of parts is disposed on the substrate, and an electrode group is disposed on the substrate so that discharge occurs in the discharge space partitioned by the partition wall. And the fluorescent substance which light-emits red, green, and blue light-emission by discharge is formed, and the some discharge cell is comprised. Then, the phosphor is excited by vacuum ultraviolet light having a short wavelength generated by discharge, and red, green, and blue visible light is emitted from the red, green, and blue discharge cells, respectively, thereby performing color display.

  Such a PDP can display at a higher speed than a liquid crystal panel, has a wide viewing angle, can be easily increased in size, and is a self-luminous type, so that the display quality is high. As a result, the flat panel display has recently attracted particular attention and is used for various purposes as a display device in a place where many people gather or a display device for enjoying a large screen image at home. Therefore, performance such as image display quality of the PDP is also required due to the recent trend toward larger screens and higher definition.

  For example, in order to make the boundary between the display area and the non-display area inconspicuous so as not to affect the image, the ratio of the electrode area occupied by the display area and the non-display area is changed by changing the width of the extended electrode. (For example, refer to Patent Document 1).

JP 2010-27489 A

  In recent years, a PDP having a narrow frame with a narrower outer frame has attracted attention in order to make the display screen appear larger.

  Therefore, an object of the present invention is to provide a PDP excellent in display quality in which a difference in boundary between an effective display area and a non-display area is not noticeable on an exposed display screen that is not covered with an outer frame portion.

  The present invention comprises a front plate provided with a plurality of display electrodes arranged in the row direction while arranging a display electrode by disposing a conductive first electrode and a second electrode on the front substrate with a discharge gap therebetween, A back plate having a discharge space provided in the front plate and arranged opposite to each other and forming a plurality of data electrodes so as to be covered with a base layer in a column direction intersecting with the display electrodes, and provided with discharge cells at the intersecting portions, And a plasma display panel having an effective display area where an image is displayed by causing discharge in the discharge cell, and a non-display area formed outside the effective display area. A non-display area A coated with a phosphor, and a non-display area B formed outside the non-display area A and not coated with a phosphor. In the non-display area A, the second electrode is divided To extend from the effective display area. The area of the first electrode and the second electrode occupying a predetermined area of the non-display area B is 61% or more and 77% or less of the area of the first electrode and the second electrode occupying the predetermined area in the effective display area. The electrode width of the second electrode in the non-display area B is 40% to 75% of the electrode width of the second electrode in the effective display area.

  According to the present invention, it is possible to improve display quality even in a PDP in which the outer frame portion is narrowed and the display screen is enlarged.

1 is an exploded perspective view showing a PDP according to an embodiment of the present invention. PDP electrode arrangement according to an embodiment of the present invention 1 is a block diagram showing a PDP device according to a first embodiment of the present invention. The top view which shows the drive waveform of PDP by Embodiment 1 of this invention The top view which shows the arrangement | positioning relationship between the scanning electrode and sustain electrode which comprise the display electrode of PDP by Embodiment 1 of this invention, and a partition Sectional drawing which shows a non-display area | region from the display area of PDP by Embodiment 1 of this invention The top view which shows a non-display area from the display area of PDP by Embodiment 1 of this invention

<Embodiment 1>
Hereinafter, the PDP according to the first embodiment of the present invention will be described with reference to FIGS. However, the embodiment of the present invention is not limited to the first embodiment.

  First, the overall configuration of the PDP according to Embodiment 1 of the present invention will be described with reference to FIGS.

1. Configuration of PDP FIG. 1 is an exploded perspective view showing a front panel and a rear panel in a separated state in the PDP according to the first embodiment of the present invention. As shown in FIG. 1, the PDP is configured by arranging a glass front plate 1 and a back plate 2 so as to form a discharge space 3 therebetween.

  The front plate 1 has a scanning electrode 5 as a conductive first electrode and a sustain electrode 6 as a second electrode arranged on a glass front substrate 4 in parallel with each other with a discharge gap MG. A plurality of display electrodes 7 are arranged in the row direction, and a dielectric layer 8 made of a glass material is formed so as to cover the scan electrodes 5 and the sustain electrodes 6. A protective film 9 made of MgO is formed on 8.

  The scan electrode 5 and the sustain electrode 6 are each made of transparent electrodes 5a, 6a such as ITO, and film thicknesses made of a conductive metal such as Ag formed so as to be electrically connected to the transparent electrodes 5a, 6a. Is composed of bus electrodes 5b and 6b of about several μm.

  The back plate 2 is provided with a plurality of data electrodes 12 made of Ag covered with an insulating layer 11 made of a glass material and arranged in a stripe shape in the column direction on a glass back substrate 10, and On the insulator layer 11, a grid-like partition wall 13 made of a glass material for partitioning the discharge space 3 between the front plate 1 and the back plate 2 for each discharge cell is provided. Further, red (R), green (G), and blue (B) phosphor layers 14R, 14G, and 14B are provided on the surface of the insulator layer 11 and the side surfaces of the partition walls 13. The front plate 1 and the back plate 2 are arranged to face each other so that the scan electrode 5 and the sustain electrode 6 intersect the data electrode 12, and the scan electrode 5, the sustain electrode 6 and the data electrode 12 intersect each other. As shown in FIG. 2, a discharge cell 15 is provided. The discharge space 3 is filled with, for example, a mixed gas of neon and xenon as a discharge gas. Note that the structure of the PDP is not limited to that described above, and for example, a structure having stripe-shaped partition walls may be used.

  Here, as shown in FIG. 2, the cross-shaped barrier ribs 13 that form the discharge cells 15 are the vertical barrier ribs 13 formed in parallel to the data electrodes 12 and the horizontal barrier ribs formed to be orthogonal to the vertical barrier ribs 13. 13. Further, the phosphor layers 14R, 14G, and 14B formed by coating in the partition wall 13 are formed of the blue phosphor layer 14B, the red phosphor layer 14R, and the green phosphor layer 14G in a stripe shape along the longitudinal partition wall 13. They are arranged in order.

  FIG. 2 is an electrode array diagram of the PDP shown in FIG. N scanning electrodes X1, X2, X3... Xn (5 in FIG. 1) and n sustaining electrodes Y1, Y2, Y3... Yn (6 in FIG. 1) are arranged in a row direction. M data electrodes A1... Am (12 in FIG. 1) that are long in the direction are arranged. Discharge cells 15 are formed at the intersections of the pair of scan electrodes X1 and sustain electrodes Y1 and one data electrode A1, and m × n discharge cells 15 are formed in the discharge space. Further, as shown in FIG. 2, the scan electrode X1 and the sustain electrode Y1 are formed on the front plate 1 in a pattern that repeats in the arrangement of the sustain electrode Y1, the scan electrode X1, the scan electrode X2, the sustain electrode Y2,. ing. Each of these electrodes is connected to a connection terminal provided at a peripheral end portion outside the image display area of the front plate 1 and the back plate 2.

2. Configuration of Plasma Display Device Next, an overall configuration of a plasma display device using the above-described PDP (hereinafter referred to as a PDP device) will be described.

  FIG. 3 is a block diagram showing the overall configuration of the plasma display device. This PDP device is a view seen from the side of viewing the display screen of the PDP. As shown in FIG. 3, a PDP 21, an image signal processing circuit 22, a data electrode drive circuit 23, a sustain electrode drive circuit 24, a scan electrode drive circuit 25, a timing generation circuit 26, and a power supply circuit (not shown) are provided. The data electrode drive circuit 23 includes a plurality of data drivers that are connected to one end of the data electrode 12 of the PDP 21 and are formed of semiconductor elements for supplying a voltage to the data electrode 12. The data electrode 12 is divided into a plurality of blocks as one block by several data electrodes 12, and a plurality of data drivers are connected to the electrode lead-out portion at the lower end of the PDP 21 in units of blocks.

  In FIG. 3, an image signal processing circuit 22 converts an image signal sig into image data for each subfield. The data electrode drive circuit 23 converts the image data for each subfield into signals corresponding to the data electrodes A1 to Am, and drives the data electrodes A1 to Am. The timing generation circuit 26 generates various timing signals based on the horizontal synchronization signal H and the vertical synchronization signal V, and supplies them to each drive circuit block. Sustain electrode drive circuit 24 supplies drive voltage waveforms to scan electrodes X1 to Xn based on timing signals, and scan electrode drive circuit 25 supplies drive voltage waveforms to sustain electrodes Y1 to Yn based on timing signals. The sustain electrode side is commonly connected inside or outside the PDP 21, and then the common connection wiring is connected to the scan electrode driving circuit 25.

3. Driving of PDP Next, a driving voltage waveform for driving the PDP 21 and its operation will be described with reference to FIG. FIG. 4 is a diagram showing drive voltage waveforms applied to the respective electrodes of the PDP 21.

  In PDP 21 according to the present embodiment, one field is divided into a plurality of subfields, and each subfield has an initialization period, an address period, and a sustain period.

3-1. Initialization Period In the initialization period of the first subfield, the data electrodes A1 to Am and the sustain electrodes Y1 to Yn are held at 0 (V), and are equal to or lower than the discharge start voltage with respect to the scan electrodes X1 to Xn. A ramp voltage that gradually rises from a voltage Vi1 (V) to a voltage Vi2 (V) that exceeds the discharge start voltage is applied. Then, the first weak initializing discharge is caused in all the discharge cells, negative wall voltages are stored on the scan electrodes X1 to Xn, and positive walls on the sustain electrodes Y1 to Yn and the data electrodes A1 to Am. The voltage is stored. Here, the wall voltage on the electrode refers to a voltage generated by wall charges accumulated on the dielectric layer or the phosphor layer covering the electrode.

  Thereafter, sustain electrodes Y1 to Yn are maintained at positive voltage Vh (V), and a ramp voltage that gradually decreases from voltage Vi3 (V) to voltage Vi4 (V) is applied to scan electrodes X1 to Xn. Then, the second weak initializing discharge is caused in all the discharge cells, the wall voltage between the scan electrodes X1 to Xn and the sustain electrodes Y1 to Yn is weakened, and the wall voltage on the data electrodes A1 to Am is reduced. Is also adjusted to a value suitable for the write operation.

3-2, Addressing Period In the subsequent addressing period, the scan electrodes X1 to Xn are temporarily held at Vr (V). Next, a negative scan pulse voltage Va (V) is applied to the scan electrode X1 in the first row, and the data electrode Ak (k = 1 to 1) of the discharge cell to be displayed in the first row among the data electrodes A1 to Am. A positive write pulse voltage Vd (V) is applied to m). At this time, the voltage at the intersection of the data electrode Ak and the scan electrode X1 is obtained by adding the wall voltage on the data electrode Ak and the wall voltage on the scan electrode X1 to the externally applied voltage (Vd−Va) (V). And the discharge start voltage is exceeded. Then, an address discharge occurs between data electrode Ak and scan electrode X1 and between sustain electrode Y1 and scan electrode X1, and a positive wall voltage is accumulated on scan electrode X1 of this discharge cell. And a negative wall voltage is also accumulated on the data electrode Ak.

  In this manner, an address operation is performed in which address discharge is caused in the discharge cells to be displayed in the first row and wall voltage is accumulated on each electrode. On the other hand, the voltage at the intersection of the data electrodes A1 to Am to which the address pulse voltage Vd (V) is not applied and the scan electrode X1 does not exceed the discharge start voltage, so that address discharge does not occur. The above address operation is sequentially performed until the discharge cell in the nth row, and the address period ends.

3-3, Sustain Period In the subsequent sustain period, the scan electrode X1 to Xn has a positive sustain pulse voltage Vs (V) as the first voltage, and the sustain electrodes Y1 to Yn have the ground voltage as the second voltage. 0 (V) is applied respectively. In the discharge cell in which the address discharge has occurred at this time, the voltage between the scan electrode Xi (i = 1 to n) and the sustain electrode Yi (i = 1 to n) is scanned to the sustain pulse voltage Vs (V). The wall voltage on the electrode Xi and the wall voltage on the sustain electrode Yi are added and exceed the discharge start voltage. Then, a sustain discharge occurs between the scan electrode Xi and the sustain electrode Yi, and the phosphor layer emits light by the ultraviolet rays generated at this time. A negative wall voltage is accumulated on scan electrode Xi, and a positive wall voltage is accumulated on sustain electrode Yi. At this time, a positive wall voltage is also accumulated on the data electrode Ak.

  In the discharge cells in which no address discharge has occurred in the address period, no sustain discharge occurs, and the wall voltage at the end of the initialization period is maintained. Subsequently, 0 (V) that is the second voltage is applied to scan electrodes X1 to Xn, and sustain pulse voltage Vs (V) that is the first voltage is applied to sustain electrodes Y1 to Yn. Then, in the discharge cell in which the sustain discharge has occurred, since the voltage between the sustain electrode Yi and the scan electrode Xi exceeds the discharge start voltage, the sustain discharge occurs again between the sustain electrode Yi and the scan electrode Xi, A negative wall voltage is accumulated on sustain electrode Yi, and a positive wall voltage is accumulated on scan electrode Xi.

3-4, the second and subsequent subfields Similarly, the address discharge is caused in the address period by alternately applying the number of sustain pulses corresponding to the luminance weight to the scan electrodes X1 to Xn and the sustain electrodes Y1 to Yn. The sustain discharge is continuously performed in the discharged cells. Thus, the maintenance operation in the maintenance period is completed. The operations in the initialization period, address period, and sustain period in the subsequent subfield are substantially the same as those in the first subfield, and thus description thereof is omitted.

4. Manufacturing method of PDP 4-1. Manufacturing method of front plate Scan electrode 5 and sustain electrode 6 are formed on front substrate 4 by photolithography. The scanning electrode 5 includes a transparent electrode 5a such as indium tin oxide (ITO) and a bus electrode 5b made of silver (Ag) or the like laminated on the transparent electrode 5a. The sustain electrode 6 includes a transparent electrode 6a such as ITO and a bus electrode 6b made of Ag or the like laminated on the transparent electrode 6a.

  As a material for the bus electrodes 5b and 6b, an electrode paste containing silver (Ag), a glass frit for binding silver, a photosensitive resin, a solvent, and the like is used. First, an electrode paste is applied to the front substrate 4 on which the transparent electrodes 5a and 6a are formed by a screen printing method or the like. Next, the solvent in the electrode paste is removed by a drying furnace. Next, the electrode paste is exposed through a photomask having a predetermined pattern.

  Next, the electrode paste is developed to form a bus electrode pattern. Finally, the bus electrode pattern is fired at a predetermined temperature in a firing furnace. That is, the photosensitive resin in the electrode pattern is removed. Further, the glass frit in the electrode pattern is melted. Thereafter, the glass frit that has been melted is vitrified by cooling to room temperature. Bus electrodes 5b and 6b are formed by the above process.

  Here, besides the method of screen printing the electrode paste, a sputtering method, a vapor deposition method, or the like can be used.

  Next, the dielectric layer 8 is formed. As a material for the dielectric layer 8, a dielectric paste containing a dielectric glass frit, a resin, a solvent, and the like is used. First, a dielectric paste is applied on the front substrate 4 by a die coating method or the like so as to cover the scan electrodes 5 and the sustain electrodes 6 with a predetermined thickness. Next, the solvent in the dielectric paste is removed by a drying furnace. Finally, the dielectric paste is fired at a predetermined temperature in a firing furnace. That is, the resin in the dielectric paste is removed. Further, the dielectric glass frit is melted. Thereafter, the cooled dielectric glass frit is vitrified by cooling to room temperature. Through the above steps, the dielectric layer 8 is formed. Here, besides the method of die coating the dielectric paste, a screen printing method, a spin coating method, or the like can be used. Alternatively, a film that becomes the dielectric layer 8 can be formed by a CVD (Chemical Vapor Deposition) method or the like without using the dielectric paste.

  Next, the protective layer 9 is formed on the dielectric layer 8.

  Through the above steps, the front plate 1 having the scan electrode 5, the sustain electrode 6, the dielectric layer 8, and the protective film 9 on the front substrate 4 is completed.

4-2, Manufacturing Method of Back Plate 2 Data electrodes 12 are formed on the back substrate 10 by photolithography. As a material of the data electrode 12, a data electrode paste containing silver (Ag) for ensuring conductivity, a glass frit for binding silver, a photosensitive resin, a solvent, and the like is used. First, the data electrode paste is applied on the back substrate 10 with a predetermined thickness by screen printing or the like. Next, the solvent in the data electrode paste is removed by a drying furnace. Next, the data electrode paste is exposed through a photomask having a predetermined pattern. Next, the data electrode paste is developed to form a data electrode pattern. Finally, the data electrode pattern is fired at a predetermined temperature in a firing furnace. That is, the photosensitive resin in the data electrode pattern is removed. Further, the glass frit in the data electrode pattern is melted. Thereafter, the glass frit that has been melted is vitrified by cooling to room temperature. The data electrode 12 is formed by the above process. Here, besides the method of screen printing the data electrode paste, a sputtering method, a vapor deposition method, or the like can be used.

  Next, the insulator layer 11 is formed. As a material of the insulator layer 11, an insulator paste containing an insulator glass frit, a resin, a solvent, and the like is used. First, an insulating paste is applied by a screen printing method or the like so as to cover the data electrode 12 on the back substrate 10 on which the data electrode 12 is formed with a predetermined thickness. Next, the solvent in the insulator paste is removed by a drying furnace. Finally, the insulator paste is fired at a predetermined temperature in a firing furnace. That is, the resin in the insulator paste is removed. Moreover, the insulator glass frit is melted. Thereafter, by cooling to room temperature, the molten insulator glass frit is vitrified. The insulator layer 11 is formed by the above process. Here, in addition to the method of screen printing the insulator paste, a die coating method, a spin coating method, or the like can be used. In addition, a film to be the insulator layer 11 can be formed by CVD (Chemical Vapor Deposition) method or the like without using the insulator paste.

  Next, the partition wall 13 is formed by photolithography. As a material of the partition wall 13, a partition wall paste including a filler, a glass frit for binding the filler, a photosensitive resin, a solvent, and the like is used. First, the barrier rib paste is applied on the insulator layer 11 with a predetermined thickness by a die coating method or the like. Next, the solvent in the partition wall paste is removed by a drying furnace. Next, the barrier rib paste is exposed through a photomask having a predetermined pattern. Next, the barrier rib paste is developed to form a barrier rib pattern. Finally, the partition pattern is fired at a predetermined temperature in a firing furnace. That is, the photosensitive resin in the partition pattern is removed. Further, the glass frit in the partition wall pattern is melted. Thereafter, the glass frit that has been melted is vitrified by cooling to room temperature. The partition wall 13 is formed by the above process. Here, in addition to the photolithography method, a sandblast method or the like can be used.

  Next, the phosphor layer 14 is formed. As a material for the phosphor layer 14, a phosphor paste containing phosphor particles, a binder, a solvent, and the like is used. First, the phosphor paste is applied to the insulating layer 11 between the plurality of adjacent barrier ribs 13 and to the side surfaces of the barrier ribs 13 by a dispensing method or the like. Next, the solvent in the phosphor paste is removed by a drying furnace. Finally, the phosphor paste is fired at a predetermined temperature in a firing furnace. That is, the resin in the phosphor paste is removed. The phosphor layer 14 is formed by the above steps. Here, in addition to the dispensing method, a screen printing method or the like can be used.

  Through the above steps, the back plate 2 having the data electrode 12, the insulator layer 11, the partition wall 13, and the phosphor layer 14 on the back substrate 10 is completed.

4-3, Assembly Method of Front Plate 1 and Back Plate 2 First, a sealing paste is applied around the back plate 2 by a dispensing method or the like. The sealing paste may contain beads, a low-melting glass material, a binder, a solvent, and the like. The applied sealing paste forms a sealing paste layer (not shown). Next, the solvent in the sealing paste layer is removed by a drying furnace. Thereafter, the sealing paste layer is temporarily fired at a temperature of about 350 ° C. The resin component etc. in the sealing paste layer are removed by temporary baking. Next, the front plate 1 and the back plate 2 are arranged to face each other so that the display electrode 7 and the data electrode 12 are orthogonal to each other.

  Further, the peripheral portions of the front plate 1 and the back plate 2 are held in a state of being pressed by a clip or the like. In this state, the low melting point glass material is melted by firing at a predetermined temperature. Then, the low-melting-point glass material that has been melted is vitrified by cooling to room temperature. Thereby, the front plate 1 and the back plate 2 are hermetically sealed. Finally, a discharge gas containing Ne, Xe or the like is sealed in the discharge space, thereby completing the PDP 21.

5. About display electrode 5-1. About fine structure of transparent electrode Next, the structure of the display electrode 7 in the display area of PDP21 of this invention is demonstrated.

  FIG. 5 is a detailed view for explaining the scan electrode 5 and the sustain electrode 6 constituting the display electrode 7. FIG. 5 shows the transparent electrodes 5a and 6a and the bus electrodes 5b and 6b as viewed from the front substrate.

  As shown in FIG. 5, the display electrode 7 includes a scan electrode 5 and a sustain electrode 6, and the scan electrode 5 and the sustain electrode 6 are electrically connected to the transparent electrodes 5a and 6a and the transparent electrodes 5a and 6a, respectively. The conductive bus electrodes 5b and 6b are formed.

  The transparent electrodes 5a formed in a stripe shape and the first transparent electrodes 17 formed in a plurality of strips for each discharge cell 15 are integrally formed. Further, the first transparent electrode 17 is divided into a plurality of parts in the discharge space cell surrounded by the barrier ribs 13, and has a shape protruding to the discharge gap side.

  Similarly, the transparent electrode 6a formed in a stripe shape and the second transparent electrode 16 formed in a strip-like shape for each discharge cell 15 are integrally formed. Further, the second transparent electrode 16 is divided into a plurality of portions in the discharge space cell surrounded by the barrier ribs 13, and has a shape protruding to the discharge gap side.

  In the discharge cell 15, a discharge gap MG is formed between the tip of the strip-shaped first transparent electrode 17 of the scan electrode 5 and the tip of the strip-shaped second transparent electrode 16 of the sustain electrode 6. .

  The transparent electrode structure having a strip shape has been described above, but the present invention is not limited to this structure. That is, the transparent electrode structure which does not have a strip shape but has only a stripe shape may be used.

6. Description of Electrode Structure in Effective Display Area and Non-Display Area Next, the structure of the electrode in the effective display area and the non-display area in the present invention will be described. The content described below is one embodiment of the present invention, and is not limited to one embodiment.

  The PDP 21 has an effective display area for displaying an actual image on the display screen and a non-display area formed outside the outer periphery of the effective display area. The non-display area is an area where no image is displayed on the display screen. That is, it is an area where the image is not lit by the discharge in the discharge cell 15.

  In the non-display area 31, several discharge cells 15 surrounded by the barrier ribs 13 are formed on the effective display area side. This will be described in more detail with reference to FIG. FIG. 6 is a cross-sectional view of the vicinity of the boundary between the display region 30 and the non-display region 31 on the scanning electrode terminal (not shown) side when viewing the display screen of the PDP. This cross-sectional view is a cross-sectional view cut in parallel with the long side direction of the PDP 21. As shown in FIG. 6, five discharge cells 15 that do not contribute to image display in the non-display area 31 are provided on the back substrate 10, and this area is an area 19. Further, phosphor layers are formed in three cells closest to the effective display region 30 in the region 19, and this region is referred to as a region 20. The data electrode 12 is formed only in the cell 18 closest to the effective element region 30 in the region 20. The arrangement of the data electrode 12 is to prevent erroneous discharge in the non-display area 31 from occurring. Furthermore, the insulator layer 11 formed on the back substrate 10 is formed outside the range where the partition wall 13 is formed. The non-display area 31 in which neither the partition wall 13 nor the phosphor layer 14 is formed is defined as the area 21.

  Further, the transparent electrodes 5 a and 6 a formed on the front substrate 4 are terminated at a position corresponding to the cell 18 closest to the effective display area 30 in order to suppress erroneous discharge. On the other hand, the bus electrodes 5 b and 6 b of the scan electrode 5 and the sustain electrode 6 are connected to a scan voltage application terminal (not shown) formed at the right end of the PDP 21. The transparent electrode 6 a of the sustain electrode 6 extends at least to the discharge cell 15 where the phosphor layer 14 is formed, but has a dividing portion in the cell 18 closest to the effective display area 30. In this embodiment, the distance between the divided portions is about 100 μm. Thereby, it is possible to prevent an erroneous discharge from occurring between sustain electrode 6 and scan electrode 5 in non-display area 31.

  In addition, the distance of a parting part should just be 90 micrometers or more and 120 micrometers or less. The bus electrodes 6b of the two adjacent sustain electrodes 6 merge to form one bus electrode 6b. The single bus electrode 6b has a terminal portion outside the non-display area of the PDP 21.

  Here, when the PDP 21 is viewed from the viewing side of the display screen, depending on the presence or absence of structures such as the insulator layer 11, the phosphor layer 14, and the partition wall 13 formed on the back substrate 10, depending on the region, it may be different from other regions. The light reflectance is different. As a result, the apparent brightness of each region is different, and the boundary line between the regions is clearly visually recognized.

  Here, as shown in FIG. 6, in the present embodiment, a region in which the insulator layer 11 and the partition wall 13 are formed in the non-display region is a region 19, and a region in which the partition wall 13 and the phosphor layer 14 are not formed is a region. 21. Further, a region 20 in which the phosphor 14 is also applied is defined as a region 20. When classified into this region, for example, a significant difference in brightness is recognized depending on the presence or absence of the phosphor layer 14 formed on the back substrate 10 in the region 21. More specifically, as shown in FIG. 6, the brightness difference between the area 21 in the non-display area 31 where only the insulator layer 11 exists on the back substrate 10 and the effective display area 30 is large. In the effective display area 30, the insulator layer 11, the phosphor layer 14, and the barrier ribs 13 are formed on the back substrate 10, but the region 21 has the phosphor layer 14 and the barrier ribs 13 on the back substrate 10. It is because it is not formed. As a result, the area 21 in the non-display area 31 has a lower reflectance than the effective display area 30.

  Similarly, when the region 20 in the non-display region 31 and the region 21 in the non-display region 31 are compared, the phosphor layer 14 and the partition wall 13 are formed in the region 20. In addition, the phosphor layer 14 and the barrier ribs 13 are not formed. As a result, the region 21 in the non-display region 31 has a lower reflectance than the region 20.

  Therefore, the first embodiment of the present invention aims to make the boundary lines between the regions less noticeable and eliminate the difference in brightness. Specifically, a front plate having a conductive electrode and a second electrode disposed on the front substrate with a discharge gap therebetween to form a display electrode and a plurality of display electrodes arranged in the row direction. And a back plate having a discharge space provided in the front plate and arranged opposite to each other and having a plurality of data electrodes covered with a base layer in a column direction intersecting with the display electrodes, and provided with discharge cells at the crossing portion. A plasma display panel having an effective display area in which an image is displayed when a discharge is generated in a discharge cell, and a non-display area formed outside the effective display area. Has a non-display area A coated with a phosphor and a non-display area B formed outside the non-display area A and not coated with a phosphor. In the non-display area A, the second electrode Is an effective display area with a dividing part? The areas of the first electrode and the second electrode that are extended and occupy a predetermined area of the non-display area B are 61% to 77% of the area of the first electrode and the second electrode that occupy the predetermined area in the effective display area. In addition, the electrode width of the second electrode in the non-display area B is 40% to 75% of the electrode width of the second electrode in the effective display area.

  A specific configuration of the bus electrodes 5b and 6b is shown in FIG. In the area 20 of the non-display area 31, the bus electrodes 5 b and 6 b are formed as in the effective display area 30. On the other hand, the bus electrode 6b has a dividing portion corresponding to the cell 18 of the non-display area 31 closest to the effective display area 30, and the bus electrode 6b extends to the outside of the non-display area 31 through the dividing section. Has been. The bus electrode 6 b extending from the divided portion to the outside of the PDP 21 is not electrically connected to the bus electrode 6 b in the effective display area 30. That is, it is a float electrode. This float electrode is not different from the composition for forming the bus electrode 6b in the effective display area 30.

  In the present invention, as shown in FIG. 7, the electrode width of the bus electrode 6 b in the region 21 of the non-display region 31 is 40% or more and 75% or less of the electrode width of the bus electrode 6 b in the effective display region 30.

  That is, the electrode width of the bus electrode 6 b in the area 21 of the non-display area 31 is smaller than the electrode width of the bus electrode 6 b in the effective display area 30. On the other hand, the electrode width of the bus electrode 5 b in the area 21 of the non-display area 31 is equal to the electrode width of the bus electrode 5 b in the effective display area 30.

  Furthermore, the area of the bus electrodes 5 b and 6 b occupying a predetermined area in the effective display area 30 is 61% or more and 77% or less of the area of the bus electrodes 5 b and 6 b in the area 21 of the non-display area 31.

  That is, the area of the bus electrodes 5 b and 6 b occupying a predetermined area in the effective display area 30 is smaller than the area of the bus electrodes 5 b and 6 b in the area 21 of the non-display area 31.

  As a result, when the display screen of the PDP 21 is viewed in the region 21 having a smaller reflectance than the effective display region 30, the difference in brightness between the effective display region 30 and the region 21 becomes smaller, and the effective display. The boundary between the region 30 and the non-display region 31 becomes difficult to see. As a result, a plasma display panel with better display quality can be provided.

7. Measurement Results Actually, the brightness of each PDP 21 prototyped was determined by adjusting the electrode width of the bus electrode 6b and the area occupied by the electrodes in the predetermined areas of the effective display area 30 and the non-display area 31. The measurement results are shown in Table 1 below. The measurement items and evaluation will be described. In each PDP 21, the electrode width (μm) of the bus electrode 6 b in the effective display region 30 and the electrode width (μm) of the bus electrode 6 b in the non-display region 31 are measured. The ratio of the electrode widths of the bus electrodes 6b in the display area 31 was obtained as the ratio of the electrode widths. Also, the electrode area is obtained by obtaining the total area 1 of the bus electrodes 5b and 6b occupying a predetermined area in the effective display region 30 and the total area 2 of the bus electrodes 5b and 6b occupying the predetermined area in the non-display region 31. The electrode area ratio was determined as the ratio of the total area 2 in the non-display area 31 to the total area 1 in the area 30. The brightness ratio (%) is a circular area having a diameter of 5 mm in each of the effective display area and the non-display area, and the lightness (L *) of each circular area is measured. The lightness (L *) is the lightness in the L * a * b color system defined in JIS Z 8729. In this embodiment, Konica Minolta's spectrocolorimeter CM-2600d is used to measure the lightness (L *). Then, the ratio (%) of the brightness in the area 21 to the brightness in the effective display area 30 was obtained.

  In the determination, the case where the brightness ratio (%) was 90% or less was determined as “Position x”, 90% or more and 100% or less was determined as “Good”, and 100% or more was determined as “Good”.

  As shown in Table 1, in the comparative panel 1, when the electrode widths of the bus electrodes 6b in the effective display region 30 and the region 21 are both 65 μm and the ratio of the total area of the electrodes is the same, the region 21 Was 88.1% with respect to the effective display area 30. In this case, the difference in brightness between the effective display area 30 and the area 21 is noticeable, and the boundary between the effective display area 30 and the area 21 is clearly recognized. Also in the comparative panel 2, the electrode width difference between the effective display region 30 and the bus electrode 6b in the region 21 was 10 μm, and the ratio of the total area of the electrodes was 0.92. In this case, the brightness of the area 21 was 89.1% with respect to the effective display area 30. As a result, the difference in brightness between the effective display area 30 and the area 21 is noticeable, and the boundary between the effective display area 30 and the area 21 is clearly recognized.

  On the other hand, in the panels 3 to 9, the electrode ratios of the effective display area 30 to the non-display area 21 are 0.62, 0.50, 0.44, 0.63, 0.74, and 0.69, respectively. 0.71. The total area ratio of the bus electrodes 5b and 6b occupying the circular area having a radius of 5 mm of the area 21 with respect to the effective display area 30 is 0.65, 0.63, 0.61, 0.68, 0.69, respectively. 0.75 and 0.75. In this case, the brightness ratio (%) of panel 3 to panel 9 exceeded 95%. As a result, the difference in brightness between the effective display region 30 and the region 21 becomes smaller, and the boundary between the effective display region 30 and the region 21 becomes more difficult to understand. In particular, for the panels 6 and 7, the brightness ratio is a difference of less than 1% between the effective display area 30 and the area 21, so that the display quality is such that the boundary between the effective display area 30 and the non-display area 31 is not known. It can be seen that is improved.

<Other embodiments>
The first embodiment has been described. However, the configuration is not limited to that of the first embodiment. Hereinafter, other embodiments will be described.

  In Embodiment 1, an electrode structure having a strip-shaped transparent electrode structure is employed. However, other structures may be adopted for the electrode structure. For example, an electrode structure having a striped transparent electrode that does not have a strip-like structure, or a ladder-shaped bus electrode that does not have a transparent electrode in the first place.

  Ladder-shaped bus electrode 5b having a structure in which scan electrode 5 and sustain electrode 6 include a first portion, a second portion parallel to the first portion, and a second portion connecting the first portion and the second portion. , 6b, in the region 21 in the non-display region 31, the electrode widths of the scan electrode 5 and the sustain electrode 6 are smaller than the effective display region 30, and the number of third portions is smaller than the effective display region. Since the reflectance is low in the non-display area B where the phosphor layer is not formed, the area of the sustain electrode 6 occupying a predetermined area in the non-display area is larger than the area of the sustain electrode 6 occupying the predetermined area in the effective display area. small. Thereby, the reflectance of the effective display area and the non-display area can be made equal (within 5%), and the problem that the display screen is uncomfortable can be solved.

  Further, a black light shielding layer may be formed between the scan electrodes and between the sustain electrodes. In the case where a black light shielding layer is formed, a terminal portion of the light shielding layer is provided in the non-display area.

  In the first embodiment, the effective display area 30 in the right hand direction and the non-display area 31 of the PDP 21 having the terminals of the scan electrodes 5 are described. However, the effective display area in the left hand direction of the PDP 21 having the terminals of the sustain electrodes 6 is described. 30 and the non-display area 31 have the same structure only by changing the correlation between the scan electrode 5 and the sustain electrode 6. More specifically, the region 20 in the left-hand direction of the PDP 21 where the terminals of the sustain electrodes 6 are provided has the scanning electrode 5 extended from the effective display region 30 having a dividing portion. That is, in the region 21, the scan electrode 5 is formed as a floating electrode that is not electrically connected to the scan electrode 5 in the effective display region 30.

  By adopting a structure equivalent to that of the first embodiment, the boundary between the scanning electrode 5 and the scanning electrode 5 as the floating electrode becomes ambiguous even in the non-display area 31 in the left-hand direction of the PDP 21 where the terminal of the sustaining electrode 6 is provided. It can solve the problem that the screen is uncomfortable.

8. Summary of Embodiments Characteristic parts in the above embodiment are listed below. In addition, the invention included in the said embodiment is not limited to the following. In addition, what was described in parentheses after each component is a specific example of each component. Each configuration is not limited to these specific examples.
(1)
In the PDP of the present invention, a conductive electrode and a second electrode are disposed on a front substrate with a discharge gap therebetween to form a display electrode, and a plurality of display electrodes are arranged in the row direction. A back plate provided with a discharge cell at a crossing portion formed by covering a face plate and a plurality of data electrodes so as to be covered with a base layer in a column direction intersecting with the display electrodes by providing a discharge space on the front plate. And comprising. This PDP has an effective display area (30) in which an image is displayed when a discharge is generated in a discharge cell, and a non-display area (31) formed outside the effective display area (30). The non-display area (31) of the plasma display panel (PDP21) is formed outside the non-display area A (area 20) coated with the phosphor (14) and the non-display area A (area 20). In addition, in the non-display area A (area 20), the second electrode (bus electrode 6b) has a dividing portion in the non-display area B (area 21) where the phosphor is not applied. 30) and the area of the first electrode (bus electrode 5b) and the second electrode (bus electrode 6b) occupying a predetermined area of the non-display area B (area 21) is a predetermined area in the effective display area (30). Area (in the effective display area 30 61% to 77% of the area of the first electrode (bus electrode 5b) and the second electrode (bus electrode 6b) occupying the predetermined region 27), and occupying a predetermined area in the non-display region B (region 21) (Predetermined region 28 in region 21) The electrode width of the second electrode (bus electrode 6b) is not less than 40% and not more than 75% of the electrode width of the second electrode (bus electrode 6b) in the effective display region (30). It is characterized by.

Thus, the boundary portion is prevented from being noticeable due to the difference in reflectance for each region on the display screen. As a result, it is possible to provide a PDP with high display quality.
(2)
It is PDP (21) as described in (1), Comprising: A parting part is 100 micrometers or less 90 micrometers or more, It is characterized by the above-mentioned.

This prevents erroneous discharge in the non-display area and prevents the divided part from being clearly seen. As a result, it is possible to provide a PDP with high display quality.
(3)
In the PDP (21) described in (1), the electrode width of the second electrode (bus electrode 6b) in the non-display area B (area 19) is 40 of the electrode width of the first electrode in the effective display area (30). % To 75%, and the first electrode and the second electrode are arranged at equal intervals.

As a result, the difference in reflectance between the effective display area and the non-display area becomes small, and the boundary between the effective display area and the non-display area becomes ambiguous. At the same time, it is prevented from being visually recognized in a striped manner in the non-display area. As a result, it is possible to provide a PDP with high display quality.
(4)
In the PDP (21) described in (1), the number of second electrodes in the non-display region B (region 21) is the second electrode (bus electrode 6b) arranged in the row direction in the effective display region (30). ) Is half of the number of.

  As a result, even in a high-definition PDP, the boundary between the effective display area and the non-display area can be made inconspicuous while ensuring an appropriate electrode width. As a result, it is possible to provide a PDP with high display quality.

  As described above, the present invention is a useful invention with higher display quality in a PDP with an enlarged display screen.

DESCRIPTION OF SYMBOLS 1 Front plate 2 Back plate 3 Discharge space 4 Front substrate 5 Scan electrode 6 Sustain electrode 5a, 6a Transparent electrode 5b, 6b Bus electrode 7 Display electrode 8 Dielectric layer 9 Protective film 10 Back substrate 11 Insulator layer 12 Data electrode 13 Partition 14R, 14G, 14B Phosphor layer 15 Discharge cell 16 Second transparent electrode 17 First transparent electrode 18 Cell closest to the effective display area 30 21 PDP
DESCRIPTION OF SYMBOLS 22 Image signal processing circuit 23 Data electrode drive circuit 24 Sustain electrode drive circuit 25 Scan electrode drive circuit 26 Timing generation circuit 27 Predetermined area in effective display area 30 Predetermined area in area 21 30 Effective display area 31 Non-display area

Claims (4)

A front plate in which a conductive first electrode and a second electrode are arranged on the front substrate with a discharge gap therebetween to form a display electrode, and a plurality of display electrodes are arranged in the row direction, and the front plate An effective display area including a back plate having a discharge space provided in a plurality of data electrodes in a column direction intersecting with the display electrodes so as to be covered with a base layer and provided with discharge cells at the intersections When,
A non-display area formed outside the effective display area, and a plasma display panel comprising:
The non-display area has a non-display area A coated with a phosphor and a non-display area B formed outside the non-display area A and not coated with the phosphor,
In the non-display area A, the second electrode has a dividing portion and extends from the effective display area,
The area of the first electrode and the second electrode occupying a predetermined area of the non-display area B is 61% to 77% of the area of the first electrode and the second electrode occupying the predetermined area in the effective display area. ,
The electrode width of the first electrode and the second electrode in the non-display area B is 40% or more and 75% or less of the electrode width of the first electrode and the second electrode in the effective display area. The plasma display panel according to claim 1, wherein the dividing portion is 100 μm or less and 90 μm or more. The electrode width of the first electrode in the effective display area is not less than 40% and not more than 75% of the electrode width of the second electrode in the non-display area B, and the first electrode in the non-display area B and the The plasma display panel according to claim 1, wherein the second electrode is arranged at equal intervals. The plasma display panel according to claim 1, wherein the number of the second electrodes in the non-display area B is ½ of the number of the second electrodes arranged in the effective display area.

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