WO2013111531A1

WO2013111531A1 - Plasma display panel and display device

Info

Publication number: WO2013111531A1
Application number: PCT/JP2013/000147
Authority: WO
Inventors: 中島　徹; 秀敏秦; 兼治桐山; 上田　健太郎; 和也野本
Original assignee: パナソニック株式会社
Priority date: 2012-01-25
Filing date: 2013-01-16
Publication date: 2013-08-01
Also published as: JP2013152837A

Abstract

A plasma display panel has an active display area and a non-display area provided outside the active display area. The non-display area has a first non-display area and a second non-display area that is provided outside the first non-display area. Further, the plasma display panel has a rear panel and a front panel that is provided facing the rear panel. The reflectance of an area corresponding to the active display area in the rear panel is larger than the reflectance of an area corresponding to the non-display area in the rear panel. The aperture ratio of an area corresponding to the active display area in the front panel is smaller than the aperture ratio of an area corresponding to the first non-display area in the front panel. The aperture ratio of an area corresponding to the first non-display area in the front panel is larger than the aperture ratio of an area corresponding to the second non-display area in the front panel.

Description

Plasma display panel and display device

The technology disclosed herein relates to a plasma display panel and a display device using the plasma display panel.

In order to make the boundary between the display area and the non-display area inconspicuous so as not to affect the image, the width of the stretched electrode is changed to set the ratio of the electrode area to the display area and the non-display area to the same level. A plasma display panel (hereinafter referred to as PDP) having such a structure is known (for example, see Patent Document 1).

JP 2010-27489 A

The disclosed PDP includes an effective display area and a non-display area provided outside the effective display area. The non-display area has a first non-display area and a second non-display area provided outside the first non-display area. Further, the PDP has a back plate and a front plate provided to face the back plate. The reflectance of the area corresponding to the effective display area on the back plate is larger than the reflectance of the area corresponding to the non-display area on the back plate. The aperture ratio of the area corresponding to the effective display area on the front plate is smaller than the aperture ratio of the area corresponding to the first non-display area on the front plate. The aperture ratio of the area corresponding to the first non-display area on the front plate is larger than the aperture ratio of the area corresponding to the second non-display area on the front plate.

FIG. 1 is a perspective view of a PDP. FIG. 2 is a cross-sectional view schematically showing the PDP. FIG. 3 is a diagram showing the electrode arrangement of the PDP. FIG. 4 is a diagram showing the configuration of the plasma display device. FIG. 5 is a diagram showing drive waveforms applied to the PDP. FIG. 6 is a front view showing an outline of the PDP. FIG. 7 is an enlarged view showing a part of the effective display area in FIG. FIG. 8 is an enlarged view showing the vicinity of the end of FIG. FIG. 9 is a cross-sectional view schematically showing the vicinity of the end of the PDP. FIG. 10 is a diagram showing the electrode configuration of the front plate in the vicinity of the end portion of the PDP. FIG. 11 is a diagram showing an outline of the plasma display device. 12 is an enlarged view showing the vicinity of the end of FIG.

The embodiment will be described in detail below. The drawings are referred to as appropriate for the description of the embodiments. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and overlapping descriptions of substantially the same configuration may be omitted. This is for avoiding redundant description and facilitating understanding by those skilled in the art.

In addition, the inventors provide the accompanying drawings and the following description for those skilled in the art to fully understand the present disclosure. The inventors do not intend the subject matter recited in the claims to be limited by the present disclosure.

[1. Configuration of PDP 21]
The PDP 21 includes a front plate 1 and a back plate 2. The PDP 21 has a discharge space 3 between the front plate 1 and the back plate 2 disposed so as to face the PDP 21.

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

The display electrode 7 has a transparent electrode such as ITO (Indium Tin Oxide). The display electrode 7 is made of a conductive metal having a film thickness of several μm made of silver (Ag) or the like. As shown in FIG. 2, the scan electrode 5 and the sustain electrode 6 are a laminate of

transparent electrodes

5a, 6a and

bus electrodes

5b, 6b on the front substrate 4 side.

The back plate 2 has a plurality of data electrodes 12 made of Ag or the like on a glass back substrate 10. The plurality of data electrodes 12 extend in a direction orthogonal to the display electrode 7. The data electrode 12 is covered with an insulator layer 11 made of a glass material. On the insulator layer 11, a grid-like partition wall 13 made of a glass material for partitioning the discharge space 3 for each cell 15 is provided. Further, on the surface of the insulator layer 11 and the side surface of the partition wall 13, a red phosphor layer 14R that emits red (R), a green phosphor layer 14G that emits green (G), and a blue that emits blue (B). A phosphor layer 14B is provided. As shown in FIG. 3, a cell 15 is provided at the intersection where the display electrode 7 and the data electrode 12 intersect. The discharge space 3 is filled with, for example, a mixed gas of neon (Ne) and xenon (Xe) as a discharge gas. The structure of the PDP 21 is not limited to that described above. For example, the PDP 21 may include a stripe-shaped partition wall.

As shown in FIGS. 1 and 2, the cross-shaped partition wall 13 is composed of a vertical partition wall 13 a provided in parallel to the data electrode 12 and a horizontal partition wall 13 b provided so as to be orthogonal to the vertical partition wall 13 a. Yes. The blue phosphor layer 14B, the red phosphor layer 14R, and the green phosphor layer 14G are provided in stripes along the vertical barrier ribs 13a. The blue phosphor layer 14B, the red phosphor layer 14R, and the green phosphor layer 14G may be collectively referred to as the phosphor layer 14 in some cases.

Each of the scan electrode 5, the sustain electrode 6, and the data electrode 12 is connected to each connection terminal provided in the peripheral portion of the PDP 21.

As shown in FIG. 3, the PDP 21 includes n scan electrodes Y1, Y2, Y3... Yn (scan electrode 5 in FIG. 1) and n sustain electrodes X1, X2 extending in the row direction in FIG. , X3... Xn (sustain electrode 6 in FIG. 1). Further, the PDP 21 has m data electrodes A1... Am (data electrodes 12 in FIG. 1) extending in the column direction in FIG. One cell 15 is provided at a portion where the pair of scan electrode Y1 and sustain electrode X1 and one data electrode A1 intersect. The cell 15 is formed so as to have m × n cells in the discharge space. Further, as shown in FIG. 3, scan electrode Y1 and sustain electrode X1 are repeated in an array of scan electrode Y1, sustain electrode X1, sustain electrode X2, scan electrode Y2,.

[2. Configuration of Plasma Display Device 100]
The plasma display apparatus 100 includes a PDP 21, an image signal processing circuit 22, a data electrode drive circuit 23, a scan electrode drive circuit 24, a sustain electrode drive circuit 25, a timing generation circuit 26, and a power supply circuit (shown in FIGS. 1 to 3). (Not shown). The data electrode drive circuit 23 has a plurality of data drivers that are connected to one end of the data electrode 12 and are made of semiconductor elements for supplying a voltage to the data electrode 12.

In FIG. 4, the image signal processing circuit 22 converts the image signal sig into image data for each subfield. The data electrode driving 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. Scan electrode drive circuit 24 supplies drive voltage waveforms to scan electrodes Y1 to Yn based on timing signals, and sustain electrode drive circuit 25 supplies drive voltage waveforms to sustain electrodes X1 to Xn based on timing signals. Note that the sustain electrode side is commonly connected in the PDP 21 or outside the PDP 21, and then the common connection wiring is connected to the sustain electrode drive circuit 25.

[3. Driving PDP21]
In the present embodiment, PDP 21 is driven by a subfield driving method. In the subfield driving method, one field is divided into a plurality of subfields. Each subfield has an initialization period, an address period, and a sustain period.

[3-1. Initialization period]
As shown in FIG. 5, in the initialization period of the first subfield, data electrodes A1 to Am and sustain electrodes X1 to Xn are held at 0 (V). A ramp voltage that gradually rises from voltage Vi1 (V) that is equal to or lower than the discharge start voltage to voltage Vi2 (V) that exceeds the discharge start voltage is applied to scan electrodes Y1 to Yn. Then, the first weak setup discharge is generated in all the cells 15. Further, a negative wall voltage is stored on the scan electrodes Y1 to Yn. A positive wall voltage is stored on sustain electrodes X1 to Xn and data electrodes A1 to Am. The wall voltage refers to a voltage generated by wall charges accumulated in a structure exposed to the discharge space 3 such as the dielectric layer 8.

Thereafter, sustain electrodes X1 to Xn are maintained at positive voltage Vh (V). A ramp voltage that gently falls from the voltage Vi3 (V) to the voltage Vi4 (V) is applied to the scan electrodes Y1 to Yn. Then, the second weak initializing discharge occurs in all the cells 15. The wall voltage between the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn is weakened. The wall voltage on the data electrodes A1 to Am is adjusted to a value suitable for the write operation.

[3-2. Write period]
In the subsequent address period, the scan electrodes Y1 to Yn are temporarily held at Vr (V). Next, a negative scan pulse voltage Va (V) is applied to the scan electrode Y1 in the first row. At the same time, the positive write pulse voltage Vd (V) is applied to the data electrode Ak (k = 1 to m) of the cell to be displayed in the first row among the data electrodes A1 to Am. At this time, the voltage at the intersection of the data electrode Ak and the scan electrode Y1 is obtained by adding the wall voltage on the data electrode Ak and the wall voltage on the scan electrode Y1 to the externally applied voltage (Vd−Va) (V). As a result, the discharge start voltage is exceeded. Address discharge is generated between data electrode Ak and scan electrode Y1 and between sustain electrode X1 and scan electrode Y1. A positive wall voltage is accumulated on the scan electrode Y1 of the cell 15 where the address discharge has occurred. A negative wall voltage is accumulated on sustain electrode X1. A negative wall voltage is accumulated on the data electrode Ak.

In this way, the address operation is performed in which the address discharge is generated in the cell 15 to be displayed in the first row and the 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 Y1 does not exceed the discharge start voltage. Accordingly, no address discharge occurs. When the above write operation is sequentially performed until reaching the cell in the nth row, the write period ends.

[3-3. Maintenance period]
In the subsequent sustain period, positive sustain pulse voltage Vs (V) is applied as the first voltage to scan electrodes Y1 to Yn. A sustain potential of 0 (V) is applied to sustain electrodes X1 to Xn as the second voltage. At this time, in the cell 15 where the address discharge has occurred, the voltage between the scan electrode Yi (i = 1 to n) and the sustain electrode Xi is the sustain pulse voltage Vs (V) and the wall voltage on the scan electrode Yi. And the wall voltage on the sustain electrode Xi are added to exceed the discharge start voltage. A sustain discharge is generated between scan electrode Yi and sustain electrode Xi. Ultraviolet rays generated by the sustain discharge excite the phosphor. The excited phosphor emits light of a predetermined wavelength. Further, a negative wall voltage is accumulated on the scan electrode Yi. A positive wall voltage is accumulated on sustain electrode Xi. At this time, a positive wall voltage is accumulated on the data electrode Ak.

In the cell 15 where no address discharge occurred during the address period, no sustain discharge occurs. That is, the wall voltage at the end of the initialization period is maintained. Subsequently, 0 (V) as the second voltage is applied to the scan electrodes Y1 to Yn. A sustain pulse voltage Vs (V), which is a first voltage, is applied to sustain electrodes X1-Xn. Then, in the cell 15 where the sustain discharge has occurred, since the voltage between the sustain electrode Xi and the scan electrode Yi exceeds the discharge start voltage, the sustain discharge occurs again between the sustain electrode Xi and the scan electrode Yi. . A negative wall voltage is accumulated on sustain electrode Xi. A positive wall voltage is accumulated on the scan electrode Yi.

[3-4. After the second subfield]
Similarly, the sustain discharge continues in the cell 15 in which the address discharge has occurred in the address period by alternately applying the number of sustain pulses corresponding to the luminance weight to the scan electrodes Y1 to Yn and the sustain electrodes X1 to Xn. Occur. The operations in the initialization period, address period, and sustain period in the subsequent subfield are also 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. As a material for scan electrode 5 and sustain electrode 6, 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 by screen printing 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 display electrode pattern. Finally, the display electrode pattern is fired at a predetermined temperature in a firing furnace. That is, the photosensitive resin in the display 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. Through the above steps, scan electrode 5 and sustain electrode 6 are formed.

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. Further, a film that becomes the dielectric layer 8 can be formed by CVD (Chemical Vapor Deposition) method or the like without using the dielectric paste.

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

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 through the above steps.

[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 a CVD (Chemical Vapor Deposition) method or the like without using an 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 rear 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.

Furthermore, 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.

As shown in FIG. 6, the PDP 21 has an effective display area for displaying an image and a non-display area provided outside the effective display area. The effective display area is an area where an image is displayed. A part of the non-display area is covered with an outer frame 50 (shown in FIG. 10).

[5. Details of display electrode 7]
[5-1. Regarding the structure of the

transparent electrodes

5a and 6a]
As shown in FIG. 7, the transparent electrode 5a extends in the same direction as the bus electrode 5b and extends from the second transparent electrode region 57 toward the discharge gap. A protruding first transparent electrode region 56 is included. The 1st transparent electrode area | region 56 is parallel to the vertical partition 13a as an example.

The second transparent electrode region 57 is rectangular as an example. As an example, the first transparent electrode region 56 is rectangular.

As shown in FIG. 7, the transparent electrode 6a has a second transparent electrode region 67 extending in the same direction as the extending direction of the bus electrode 6b, and from the second transparent electrode region 67 toward the discharge gap. A protruding first transparent electrode region 66 is included. For example, the first transparent electrode region 66 is parallel to the vertical partition wall 13a.

The second transparent electrode region 67 is rectangular as an example. As an example, the first transparent electrode region 66 is rectangular.

In the cell 15, a discharge gap is provided between the distal end portion of the first transparent electrode region 56 included in the scan electrode 5 and the distal end portion of the first transparent electrode region 66 included in the sustain electrode 6.

Note that a plurality of the first

transparent electrode regions

56 and 66 are preferably provided in one cell 15. This is because the discharge becomes more stable.

The

transparent electrodes

5a and 6a may be configured not to include the first

transparent electrode regions

56 and 66.

[6. Structure of display electrode 7 in effective display area and non-display area]
The effective display area shown in FIG. 6 is an area where the phosphor layer 14 emits light by the discharge generated in the cell 15. On the other hand, a plurality of cells 15 are also provided in the non-display area. However, no discharge occurs in the cell 15 in the non-display area.

Further, as shown in FIG. 8, the non-display area has a first non-display area and a second non-display area. The second non-display area is provided outside the first non-display area.

A more detailed configuration is shown in FIG. 9 and FIG. In FIG. 9, the dielectric layer 8 and the protective film 9 are omitted. The first non-display area includes a first area and a second area. The first area further includes a third area and a fourth area. In the third region, three cells 15 are provided in the cross section. In the fourth region, two cells 15 are provided in the cross section. The cell 15 provided in the third region has a phosphor layer 14. Further, the cell 15 closest to the effective display area has the data electrode 12. This is to prevent erroneous discharge from occurring in the non-display area. The cell 15 provided in the fourth region does not have the phosphor layer 14 and the data electrode 12. That is, the partition wall 13 is only provided on the insulator layer 11. Note that the second region does not include the cell 15.

The transparent electrode 6a provided on the front substrate 4 is terminated at a position corresponding to the cell 15 closest to the effective display area in order to suppress erroneous discharge. The bus electrode 6b has a dividing portion in an area corresponding to the cell 15 closest to the effective display area. The distance of the dividing part is about 100 μm. Thereby, it is possible to suppress the occurrence of erroneous discharge between the sustain electrode 6 and the scan electrode 5 in the non-display area.

In addition, the distance of the dividing part is preferably 90 μm or more and 120 μm or less. Further, as shown in FIG. 8, two adjacent bus electrodes 6b are connected in the fourth region to form one bus electrode 6b. One bus electrode 6b is terminated in the second non-display area.

On the other hand, the bus electrode 5b is connected to a scanning voltage application terminal (not shown) formed at the right end of the PDP 21.

[6. -1 Reflectance of back plate 2]
When viewed from the display screen side of the PDP 21, there may be a region where the reflectance of external light differs depending on the presence or absence of the insulator layer 11, the partition wall 13, the phosphor layer 14, and the like included in the back plate 2. In that case, the apparent brightness of each region is different, and the boundary between the regions is easily visually recognized.

In the present embodiment, the second area has a smaller reflectance than the effective display area. In the effective display area, an insulator layer 11, a partition wall 13, and a phosphor layer 14 are provided. On the other hand, the partition wall 13 and the phosphor layer 14 are not provided in the second region.

The second region has a smaller reflectance than the third region. A partition wall 13 and a phosphor layer 14 are provided in the third region. On the other hand, the partition wall 13 and the phosphor layer 14 are not provided in the second region.

The third area has a higher reflectance than the fourth area. A partition wall 13 and a phosphor layer 14 are provided in the third region. On the other hand, the phosphor layer 14 is not provided in the fourth region.

[6. -2 Opening ratio of front plate 1]
Therefore, in the present embodiment, as shown in FIG. 9, the aperture ratio varies depending on the area of the front plate 1. The aperture ratio is a ratio of an area through which light passes per unit area of the front plate 1. As an example, light is blocked by the display electrode 7. That is, if the area of the display electrode 7 per unit area is large, the aperture ratio is small. On the other hand, if the area of the display electrode 7 per unit area is small, the aperture ratio increases.

As shown in FIG. 10, the area of the display electrode 7 per unit area (region A) in the effective display region is larger than the area of the display electrode 7 per unit area (region B) in the second region. In this embodiment, the unit area refers to an area of about 2 vertical cells and 2 horizontal cells in the effective display area. That is, the length is long enough to include two

bus electrodes

5b and 6b.

As an example, the area of the display electrode 7 per unit area (region B) in the second region (the area of the

bus electrodes

5b and 6b) is the area of the display electrode 7 per unit area (region A) in the effective display region ( 61% to 77% of the area of the

bus electrodes

5b and 6b).

The width of the bus electrode 6b in the second area may be not less than 40% and not more than 75% of the width of the bus electrode 6b in the effective display area.

That is, the electrode width of the bus electrode 6b in the second area is smaller than the electrode width of the bus electrode 6b in the effective display area. On the other hand, the width of the bus electrode 5b in the first non-display area may be equal to the width of the bus electrode 5b in the effective display area. As a result, the difference in the amount of reflected light between the effective display area and the first non-display area is reduced. Therefore, it becomes difficult to see the boundary between the effective display area and the non-display area.

On the other hand, the aperture ratio in the second non-display area is smaller than the aperture ratio in the first non-display area. Considering disconnection of the display electrode 7 and the like, it is advantageous that the area of the display electrode 7 per unit area is large.

11 and 12, the plasma display device 100 using the PDP 21 includes an outer frame 50. The outer frame 50 covers a part of the non-display area in the PDP 21. The outer frame 50 does not cover the first non-display area. On the other hand, the outer frame 50 covers the second non-display area.

That is, since the second non-display area is covered with the outer frame 50, it is not necessary to consider the difference in the amount of reflected light. Therefore, in the present embodiment, the aperture ratio of the first non-display area on the front plate 1 is larger than the aperture ratio of the second non-display area on the front plate 1.

[7. Evaluation]
The brightness of the plurality of PDPs 21 is adjusted by adjusting the width of the bus electrode 6b and the electrode area in the unit area of the effective display region and the second region. An example is shown in Table 1.

In the PDP 21, the ratio of the electrode width in the effective display area is calculated from the width of the bus electrode 6b in the effective display area and the width of the bus electrode 6b in the first non-display area. Further, the ratio of the electrode areas is obtained from the total area of the

bus electrodes

5b and 6b per unit area in the effective display area and the total area of the

bus electrodes

5b and 6b per unit area in the first non-display area. The brightness ratio (%) is a ratio of lightness (L *) in the effective display area and the first non-display area. The lightness (L *) is the lightness in the L * a * b color system defined in JIS Z 8729. For example, Konica Minolta's spectrocolorimeter CM-2600d is used for measuring the lightness (L *). The measurement area is a circular area having a diameter of 5 mm. The determination is C when the brightness ratio (%) is 90% or less. B is 90% or more and 100% or less. A is 100% or more.

The PDP 21 of Sample 1-7 has 1080 pixels in the horizontal direction in the effective display area. The PDP 21 of Sample 8 has 720 pixels in the horizontal direction in the effective display area. The PDP 21 of sample 9 has 768 pixels in the horizontal direction in the effective display area. In the present embodiment, the number of pixels in the horizontal direction is equal to the number of scan electrodes 5 and sustain electrodes 6.

Sample 1 has an electrode width ratio of 1.0. The electrode area ratio is also 1.0. The brightness ratio is 88.1%. In sample 1, the boundary between the effective display area and the second area is clearly recognized by the difference in brightness between the effective display area and the second area. Therefore, the determination of sample 1 is C.

Sample 2 has an electrode width ratio of 0.84. The electrode area ratio is 0.92. The brightness ratio is 89.1%. In Sample 2, the boundary between the effective display area and the second area is clearly recognized based on the difference in brightness between the effective display area and the second area. Therefore, the determination of sample 2 is C.

Sample 3 has an electrode width ratio of 0.62. The electrode area ratio is 0.65. The brightness ratio is 96.0%. In sample 3, the difference in brightness between the effective display area and the second area is within 5%, which is relatively small. Therefore, it is difficult to recognize the boundary between the effective display area and the second area. Therefore, the determination of sample 3 is B.

Sample 4 has an electrode width ratio of 0.50. The electrode area ratio is 0.63. The brightness ratio is 98.2%. In sample 4, the difference in brightness between the effective display area and the second area is within 5%, which is relatively small. Therefore, it is difficult to recognize the boundary between the effective display area and the second area. Therefore, the determination of sample 4 is B.

Sample 5 has an electrode width ratio of 0.44. The electrode area ratio is 0.61. The brightness ratio is 98.9%. In sample 5, the difference in brightness between the effective display area and the second area is within 5%, which is relatively small. Therefore, it is difficult to recognize the boundary between the effective display area and the second area. Therefore, the determination of sample 5 is B.

Sample 6 has an electrode width ratio of 0.63. The electrode area ratio is 0.68. The brightness ratio is 101.0%. In sample 6, the difference in brightness between the effective display area and the second area is within 1%, which is relatively smaller. Therefore, the boundary between the effective display area and the second area is less likely to be recognized. Therefore, the determination of sample 6 is A.

Sample 7 has an electrode width ratio of 0.74. The electrode area ratio is 0.69. The brightness ratio is 100.7%. In sample 7, the difference in brightness between the effective display area and the second area is within 1%, which is relatively smaller. Therefore, the boundary between the effective display area and the second area is less likely to be recognized. Therefore, the determination of sample 7 is A.

Sample 8 has an electrode width ratio of 0.69. The electrode area ratio is 0.75. The brightness ratio is 96.3%. In sample 8, the difference in brightness between the effective display area and the second area is within 5%, which is relatively small. Therefore, it is difficult to recognize the boundary between the effective display area and the second area. Therefore, the determination of sample 8 is B.

Sample 9 has an electrode width ratio of 0.71. The electrode area ratio is 0.75. The brightness ratio is 96.3%. In sample 8, the difference in brightness between the effective display area and the second area is within 5%, which is relatively small. Therefore, it is difficult to recognize the boundary between the effective display area and the second area. Therefore, the determination of sample 9 is B.

[8. Other Embodiments]
As another embodiment, the

transparent electrodes

5a and 6a may not have the first

transparent electrode regions

56 and 66.

Alternatively, the display electrode 7 may have a configuration without the

transparent electrodes

5a and 6a. In this case, the display electrode 7 may have a ladder-shaped bus electrode. 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 will be described. In the second region, the width of the scan electrode 5 and the sustain electrode 6 is smaller than the effective display region, and the number of the third portions is smaller than the effective display region. In the fourth region where the phosphor layer 14 is not provided, the reflectance is relatively low. Therefore, the area of sustain electrode 6 per unit area of the non-display area is preferably smaller than the area of sustain electrode 6 per unit area of the effective display area. It is preferable to make the difference in reflectance between the effective display area and the non-display area equal (within 5%).

Furthermore, a black light shielding layer may be provided between the plurality of scanning electrodes 5 and between the plurality of sustain electrodes 6. When the light shielding layer is formed, the terminal portion of the light shielding layer is provided in the non-display area.

And the said embodiment is description about the area | region on the right side of PDP21 in which the terminal of the scanning electrode 5 exists. However, the same applies to the left region of the PDP 21 where the terminals of the sustain electrodes 6 are provided. This is because the structure is the same except that the correlation between the scan electrode 5 and the sustain electrode 6 changes. Specifically, in the third region on the left side of PDP 21 where the terminal of sustain electrode 6 is located, scan electrode 5 has a dividing portion. That is, in the fourth region, the scanning electrode 5 as a floating electrode that is not electrically connected to the scanning electrode 5 in the effective display region is provided. By adopting the same configuration as that of the right area of the PDP 21, it becomes difficult to recognize the boundary between the effective display area and the second area.

[9. Summary of Embodiment]
Characteristic parts in the above embodiment are listed below. In addition, the invention included in the said embodiment is not limited to the following.

(1)
The PDP 21 according to the present disclosure includes an effective display area and a non-display area provided outside the effective display area. The non-display area has a first non-display area and a second non-display area provided outside the first non-display area. Further, the PDP 21 has a back plate 2 and a front plate 1 provided to face the back plate 2. The reflectance of the area corresponding to the effective display area on the back plate 2 is larger than the reflectance of the area corresponding to the non-display area on the back plate 2. The aperture ratio of the area corresponding to the effective display area on the front plate 1 is smaller than the aperture ratio of the area corresponding to the first non-display area on the front plate 1. The aperture ratio of the area corresponding to the first non-display area on the front plate 1 is larger than the aperture ratio of the area corresponding to the second non-display area on the front plate.

This makes it possible to suppress the conspicuous boundary due to the difference in the reflectance of each area on the display screen. Therefore, the high quality PDP 21 can be provided.

(2)
In the PDP 21 described in (1), the front plate 1 includes a plurality of display electrodes 7. The width of at least one display electrode 7 among the plurality of display electrodes 7 in the region corresponding to the effective display region is the same as that of at least one display electrode 7 among the plurality of display electrodes 7 in the region corresponding to the first non-display region. Greater than width. The width of at least one display electrode 7 among the plurality of display electrodes 7 in the region corresponding to the first non-display region is at least one display among the plurality of display electrodes 7 in the region corresponding to the second non-display region. It is smaller than the width of the electrode 7.

(3)
In the PDP 21 described in (2), the width of the plurality of display electrodes 7 in the region corresponding to the effective display region is larger than the width of the plurality of display electrodes 7 in the region corresponding to the first non-display region.

(4)
In the PDP 21 described in (2), the width of at least one display electrode 7 among the plurality of display electrodes 7 in the region corresponding to the first non-display region is equal to the plurality of display electrodes 7 in the region corresponding to the effective display region. The width of at least one display electrode 7 is 40% or more and 75% or less.

(5)
In the PDP 21 described in (1), the front plate 1 includes a plurality of display electrodes 7.

The area occupied by the plurality of display electrodes 7 per unit area in the area corresponding to the effective display area is larger than the area occupied by the plurality of display electrodes 7 per unit area in the area corresponding to the first non-display area. The area occupied by the plurality of display electrodes 7 per unit area in the region corresponding to the first non-display region is smaller than the area occupied by the plurality of display electrodes 7 per unit area in the region corresponding to the second non-display region. .

(6)
In the PDP 21 described in (5), the area occupied by the plurality of display electrodes 7 per unit area in the region corresponding to the first non-display region is the plurality of display electrodes per unit area in the region corresponding to the effective display region. 7 to 77% of the area occupied by 7.

(7)
In the PDP 21 described in (1), the front plate 1 includes a plurality of display electrodes 7. The plurality of display electrodes 7 include a plurality of scan electrodes 5 and a plurality of sustain electrodes 6. The total number of the plurality of sustain electrodes 6 in the area corresponding to the first non-display area is smaller than the total number of the plurality of sustain electrodes 6 in the area corresponding to the effective display area.

(8)
In the PDP 21 described in (7), the total number of the plurality of sustain electrodes 6 in the region corresponding to the first non-display region is a half of the plurality of sustain electrodes 6 in the region corresponding to the effective display region.

(9)
In the PDP 21 described in (2) to (6), the back plate 2 further includes a third area which is a dummy area between an area corresponding to the effective display area and an area corresponding to the non-display area. The back plate 2 includes a plurality of partition walls 13 and a phosphor layer 14 provided between the plurality of partition walls 13 in the third region. The plurality of display electrodes 7 include a plurality of scan electrodes 5 and a plurality of sustain electrodes 6. At least one of the plurality of sustain electrodes 6 has a dividing portion in a region facing the third region.

This prevents the occurrence of erroneous discharge.

(10)
In PDP21 as described in (9), the distance of a parting part is 90 micrometers or more and 120 micrometers or less.

This prevents the occurrence of erroneous discharge more.

(11)
A plasma display device 100, which is a display device, including the outer frame 50 that includes the PDP 21 described in (1) and covers a second non-display area.

This makes it possible to suppress the conspicuous boundary due to the difference in the reflectance of each area on the display screen. Therefore, it is possible to provide the plasma display device 100 including the high-quality PDP 21.

As described above, the embodiment has been described as an example of the technique in the present disclosure. To that end, the accompanying drawings and detailed description have been provided.

Therefore, the constituent elements described in the accompanying drawings and the detailed description may include constituent elements that are not essential for solving the problem. This is to illustrate the above technique. The non-essential components are described in the accompanying drawings and the detailed description, so that the non-essential components should not be recognized as essential.

Further, the above-described embodiment is for illustrating the technique in the present disclosure. Therefore, various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and the equivalents thereof.

As described above, the technology disclosed in the present embodiment can be used for a display device with a large 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 13a Vertical barrier rib 13b Horizontal barrier rib 14 Phosphor layer 14R Red phosphor layer 14G Green phosphor layer 14B Blue phosphor layer 15 Cell 21 PDP
DESCRIPTION OF SYMBOLS 22 Image signal processing circuit 23 Data electrode drive circuit 24 Scan electrode drive circuit 25 Sustain electrode drive circuit 26 Timing generation circuit 50

Outer frame

56,66 1st transparent electrode area |

region

57,67 2nd transparent electrode area | region 100 Plasma display apparatus

Claims

An effective display area and a non-display area provided outside the effective display area;
The non-display area includes a first non-display area and a second non-display area provided outside the first non-display area,
Furthermore, it has a front plate provided opposite to the back plate and the back plate,
The reflectance of the area corresponding to the effective display area on the back plate is larger than the reflectance of the area corresponding to the non-display area on the back plate,
The aperture ratio of the area corresponding to the effective display area on the front plate is smaller than the aperture ratio of the area corresponding to the first non-display area on the front plate,
The aperture ratio of the area corresponding to the first non-display area in the front plate is larger than the aperture ratio of the area corresponding to the second non-display area in the front plate,
Plasma display panel.
The front plate includes a plurality of display electrodes,
The width of at least one of the plurality of display electrodes in the region corresponding to the effective display region is equal to the width of at least one of the plurality of display electrodes in the region corresponding to the first non-display region. Larger than width,
The width of at least one display electrode among the plurality of display electrodes in the region corresponding to the first non-display region is at least one of the plurality of display electrodes in the region corresponding to the second non-display region. Smaller than the width of the display electrode,
The plasma display panel according to claim 1.
A width of the plurality of display electrodes in a region corresponding to the effective display region is larger than a width of the plurality of display electrodes in a region corresponding to the first non-display region;
The plasma display panel according to claim 2.
The width of at least one display electrode among the plurality of display electrodes in the region corresponding to the first non-display region is equal to the width of at least one display electrode among the plurality of display electrodes in the region corresponding to the effective display region. 40% or more and 75% or less of the width,
The plasma display panel according to claim 2.
The front plate includes a plurality of display electrodes,
The area occupied by the plurality of display electrodes per unit area in the area corresponding to the effective display area is larger than the area occupied by the plurality of display electrodes per unit area in the area corresponding to the first non-display area,
The area occupied by the plurality of display electrodes per unit area in the region corresponding to the first non-display region is the area occupied by the plurality of display electrodes per unit area in the region corresponding to the second non-display region. Smaller,
The plasma display panel according to claim 1.
The area occupied by the plurality of display electrodes per unit area in the region corresponding to the first non-display region is 61% of the area occupied by the plurality of display electrodes per unit area in the region corresponding to the effective display region. 77% or less,
The plasma display panel according to claim 5.
The front plate includes a plurality of display electrodes,
The plurality of display electrodes include a plurality of scan electrodes and a plurality of sustain electrodes,
A total number of the plurality of sustain electrodes in a region corresponding to the first non-display region is smaller than a total number of the plurality of sustain electrodes in a region corresponding to the effective display region;
The plasma display panel according to claim 1.
The total number of the plurality of sustain electrodes in the region corresponding to the first non-display region is a half of the plurality of sustain electrodes in the region corresponding to the effective display region.
The plasma display panel according to claim 7.
The back plate further includes a dummy area between an area corresponding to the effective display area and an area corresponding to the non-display area,
The back plate has a plurality of partition walls in the dummy region, and a phosphor layer provided between the plurality of partition walls,
The plurality of display electrodes include a plurality of scan electrodes and a plurality of sustain electrodes,
At least one sustain electrode among the plurality of sustain electrodes has a dividing portion in a region facing the dummy region.
The plasma display panel according to any one of claims 2 to 6.
The width of the divided portion is 90 μm or more and 120 μm or less,
The plasma display panel according to claim 9.
A plasma display panel according to claim 1,
An outer frame covering the second non-display area;
Display device.