JP2010165489A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress defects caused in a process without spoiling mechanical strength of a barrier rib while achieving high definition and high efficiency of a plasma display panel. <P>SOLUTION: In the barrier rib having a box structure, which is disposed between the front substrate and the back substrate of the plasma display panel, mechanical strength of the barrier rib is maintained by leaving the partially wider barrier rib in each unit cell although the barrier rib is narrowed for the purpose of achieving high efficiency. Thereby, cracks and breaks of the barrier rib caused by a load applied to the panel in a superposing and evacuating process can be suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel used in a television or a display device.

  A general plasma display panel has a large number of discharge cells partitioned by barrier ribs in a space between a front substrate and a rear substrate. The discharge cells are coated with red, green, and blue color phosphors, and discharge occurs in the discharge cells to generate ultraviolet rays, thereby exciting the phosphors to emit light.

At present, the barrier ribs for partitioning the discharge cells are generally box-shaped barrier ribs arranged in a grid pattern with respect to the display surface. (Patent Document 1) Further, in the plasma display panel having the box-structured partition wall, a concave groove is provided in a part of the partition wall constituting the unit cell for the purpose of high luminance and high efficiency, so that the brightness and the partition wall strength are simultaneously provided The structure to be secured is also known. (Patent Document 2)
Japanese Patent Laid-Open No. 11-213896 JP 2006-222075 A

  In the plasma display panel having the box-structured partition, it is required to narrow the width of the partition for the purpose of high brightness and high efficiency. However, reducing the width of the partition walls lowers the mechanical strength of the partition walls themselves. For this reason, when the partition wall receives pressure in the process of stacking, sealing, and exhausting the front substrate and the back substrate in panel manufacture, the partition wall is cracked or chipped, resulting in a light emission failure.

  Further, in the structure in which a concave groove is provided in a part of the partition wall constituting the unit cell shown in Patent Document 2, the higher the fine panel, the finer the concave groove in the partition wall, and the variation in partition wall formation accuracy. Due to the difference in the aperture ratio per unit cell, there is a risk that luminance variation will occur. In addition, it is difficult to evenly apply the phosphor in the concave groove, and there is a possibility that a variation in luminance occurs in each cell. For this reason, not only the barrier rib forming process but also the phosphor coating process requires more advanced techniques.

  In the present invention, in the present invention, in the partition wall of the box structure disposed between the front substrate and the rear substrate of the plasma display panel, the vertical partition wall is narrowed for the purpose of high efficiency, but partially in units of cells. By leaving the wide vertical partition walls, the mechanical strength of the partition walls can be maintained, and cracks and chipping of the partition walls due to the load applied to the panel during the stacking / exhausting process can be suppressed.

  Further, in the barrier rib structure suggested by the present invention, it is not necessary to form fine irregularities on the barrier ribs, and all the barrier ribs constituting the unit cell have a flat plate structure, which facilitates the barrier rib manufacturing process and the phosphor coating process. Can be.

  According to the present invention, while maintaining high definition and high efficiency of the plasma display panel, it does not impair the mechanical strength of the partition walls, thereby suppressing the occurrence of defects in the process and supplying a good quality plasma display panel easily and efficiently. It becomes possible to do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 2 is a block diagram schematically showing an overall configuration of an example of a plasma display module. The plasma display panel 55 includes a sustain electrode 2 and a scan electrode 3 that repeatedly discharge, and an address electrode 7 that extends in a direction intersecting these two electrode groups. In addition, an address driving circuit 14, a scan driver 15, a Y driving circuit 16, and an X driving circuit 17 are connected to apply a voltage to each electrode. Moreover, the control circuit 18 for controlling them is provided.

  For example, field data that is multi-value image data indicating luminance levels of three colors R, G, and B, and various synchronization signals (clock signal CLK, horizontal synchronization signal Hsync, vertical) from an external device such as a TV tuner or a computer. The synchronization signal Vsync) is input. Then, the control circuit 18 outputs a control signal suitable for each drive circuit from the field data and various synchronization signals to perform a predetermined image display.

  The plasma display panel 55 includes a sustain electrode 2 (X1, X2, X3,...) That performs sustain discharge (sustain discharge) and a scan electrode 3 (Y1, Y2, Y3,. Configure. The sustain electrodes 2 and the scan electrodes 3 and the address electrodes 7 (A1, A2, A3,...) Perpendicularly intersecting these electrodes constitute a matrix display cell.

  In the address process for selecting a discharge cell, the scan driver 15 sequentially applies scan pulses to the scan electrodes 3 to select the scan electrodes 3 (display lines), and scans the address electrodes 7 connected to the address drive circuit 14 and each scan. An address discharge for selecting lighting / non-lighting of the cell for each subfield is generated between the electrodes 3. In addition, the Y drive circuit 16 and the X drive circuit 17 cause the number of sustain discharges corresponding to the luminance of each subfield to the cells selected by the address discharge in the display process in which the sustain discharge is performed.

  FIG. 3 is a diagram showing an example of a gradation driving sequence in the plasma display device of FIG. As shown in FIG. 3, in the gradation driving sequence in the plasma display apparatus, one field (frame) 19 is composed of a plurality of subfields 20 (subframes) SF1 to SFn each having a predetermined luminance. The desired gradation display is performed by the combination. Specifically, as the plurality of subfields, for example, eight subfields SF1 to SF8 having a luminance ratio of the power of 2 (the ratio of the number of sustain discharges is 1: 2: 4: 8: 16: 32: 64: 128), 256 gradations are displayed. Various combinations of the number of subfields and the luminance ratio of each subfield are possible.

  Each subfield includes an initialization process (reset period 21) for making the wall charges of all the cells in the display region uniform, an address process (address period 22) for selecting a lighted cell, and brightness of the selected cell. It is composed of a display process (sustain discharge period 23) that discharges (lights) a number of times according to (weight of each subfield), and the cell is turned on according to the brightness for each display of each subfield. By displaying the fields (SF1 to SF8), one field is displayed. There is also a driving method of a selective initialization process (reset period 21) in which only the cells discharged in the immediately preceding display process (sustain discharge period 23) are discharged.

  Next, FIG. 4 shows an example of the drive waveform. (A) to (c) show drive waveforms applied to the sustain, scan, and address electrodes from the reset period 21 to the sustain discharge period 23, respectively.

  First, the maintenance of (a) and (b), the Y writing blunt wave 32 and the X voltage 25 for forming wall charges in all the cells are applied to the scan electrodes. Subsequently, a Y-compensation blunt wave 33 and an X-compensation voltage 26 are applied to erase the wall charges formed in the cell while leaving a necessary amount.

  The voltage waveform applied in the next address period 22 is a scan pulse 34 for performing discharge for determining cells to be displayed in the row direction and an X voltage 27 for forming charges by the main discharge. In the subsequent display period, the first sustain pulses 28 and 35 and the repeated sustain pulses 29, 36, 30, 31, 37, and 38 are applied.

  The drive waveform applied to the address electrode 7 in the address period in (c) is an address pulse 47 for performing discharge for determining cells to be displayed in the column direction. The address pulse is applied at the timing of causing discharge to the cell to be displayed located at the intersection of the scan electrode 3 and the address electrode 7 in accordance with the scan pulse 34 applied for each row. In addition to the above driving waveforms, a driving waveform for erasing wall charges may be added at the end of the display period.

  FIG. 1 is an exploded perspective view showing an example of a plasma display panel structure according to the present invention. On the front substrate 1, a sustain electrode 2 and a scan electrode 3 formed of a transparent electrode 50 and a metal electrode 51 are arranged. A large number of sustain electrodes 2 and scan electrodes 3 are arranged in parallel in pairs, and discharge is repeatedly performed between them. This electrode group is covered with a dielectric layer 4, and the surface thereof is further covered with a protective layer 5 such as MgO. Address electrodes 7 are arranged on the back substrate 6 in a direction perpendicular to the sustain electrodes 2 and the scan electrodes 3, and are further covered with a second dielectric layer 8. A vertical barrier rib 9 extending in the same direction as the address electrode is disposed on both sides of the address electrode 7, and further extending in the same direction as the sustain electrode 2 and the scan electrode 3 and crossing the vertical barrier rib 9. 10 is arranged. The discharge cells are divided by the barrier ribs 52 having a box structure formed by combining the vertical barrier ribs 9 and the horizontal barrier ribs 10. Further, the dielectric layer 8 on the address electrode 7 and the side surfaces of the vertical barrier rib 9 and the horizontal barrier rib 10 are excited by ultraviolet rays to generate visible light of each color of red (R), green (G), and blue (B). A red phosphor 11, a green phosphor 12, and a blue phosphor 13 are applied. The front substrate 1 and the rear substrate 6 are bonded together so that the protective layer 5 and the partition wall 52 are in contact with each other, and a discharge gas such as Ne—Xe is sealed therein to constitute a panel.

  There are two types of vertical barrier ribs 9, a wide vertical barrier rib 48 and a vertical barrier rib 49 narrower than the wide vertical barrier rib 48. As a result, there are discharge cells sandwiched between vertical barrier ribs having different widths. A narrow vertical partition wall 49 improves the aperture ratio of the panel to improve luminance and efficiency. On the other hand, the vertical partition wall 9 is partially provided with a wide vertical partition wall 48 to increase the mechanical strength of the partition wall 52. I try not to damage it. That is, by disposing the discharge cells sandwiched between the vertical barrier ribs 48 and 49 having different widths with a predetermined regularity, it is possible to prevent the occurrence of cracking and chipping with respect to the load generated between the front substrate 1 and the rear substrate 6, In addition, the brightness and efficiency can be improved.

  In the plasma display panel shown in this example, the vertical barrier ribs 9 formed on the same line in the row direction include a wide vertical barrier rib 48 and a narrow vertical barrier rib 49. In order to increase the aperture ratio of the panel for the purpose of improving the brightness while maintaining the mechanical strength of the partition 52, the number of wide vertical partitions is not less than half of the number of the vertical partitions 9 formed on the entire surface of the panel. Must not. That is, the number of wide vertical partition walls 48 formed in the panel surface must be less than the number of narrow vertical partition walls 49. Of the eight vertical barrier ribs 9 shown in FIG. 1, three wide vertical barrier ribs are formed, which is an example of less than half of the number of vertical barrier ribs. The width of the wide vertical partition wall 48 does not need to be uniform over the entire panel surface. If the width of the vertical partition wall 48 is wider than that of the narrow vertical partition wall 49, the width of the wide vertical partition wall 48 is as follows. There may be multiple types.

FIG. 5 is a plan view showing only the partition wall in the present invention. Discharge cells are partitioned by the horizontal barrier ribs 10 extending in the horizontal direction, the wide vertical barrier ribs 48 extending in the vertical direction, and the narrow vertical barrier ribs 49 extending in the vertical direction. In this figure, the discharge cells partitioned by the wide vertical barrier ribs 48a are sandwiched between the wide vertical barrier ribs 48a and the narrow vertical barrier ribs 49a.
Further, the number of the wide vertical partition walls 48a is 14, while the number of the narrow vertical partition walls 49a is 14, and the wide vertical partition walls 48a are smaller than the narrow vertical partition walls 49a. Further, the vertical partition walls adjacent to the wide vertical partition wall 48a in the vertical and horizontal directions are narrow vertical partition walls 49a. This prevents the wide vertical partition wall 48a from concentrating locally and prevents the occurrence of luminance unevenness.

  FIG. 6 is an example of a plan view showing only the partition wall in the present invention. Discharge cells are partitioned by a horizontal barrier rib extending in the horizontal direction, a wide vertical barrier rib 48 extending in the vertical direction, and a narrow vertical barrier rib 49 extending in the vertical direction. In this figure, two narrow vertical barrier ribs 49b and 49c are arranged between two wide vertical barrier ribs 48b and 48c existing in the same row.

  A discharge cell partially formed by the wide vertical barrier rib 48b has a smaller discharge space than other discharge cells, but two discharge cells are provided between the two wide vertical barrier ribs 48b and 48c. By arranging the vertical barrier ribs 49b and 49c having a narrow width, the discharge spaces to which the red phosphor 11, the green phosphor 12, and the blue phosphor 13 formed in the same row are applied are unified for each color. This prevents the occurrence of chromaticity unevenness.

  FIG. 7 is an example of a plan view showing only the partition wall in the present invention. In one row below the row in which one wide vertical partition wall 48d is arranged, a wide vertical partition wall 48e is formed, which is different from the wide vertical partition wall 48d by one column. Further, with respect to the row adjacent to the lower one of the wide vertical barrier ribs 48e, the wide vertical barrier ribs 48f are formed differently from the wide vertical barrier ribs 48e by one column.

  A discharge space partially formed by the wide vertical barrier rib 48 becomes narrower than other discharge spaces. By disposing the wide vertical barrier ribs 48 regularly in the panel surface, the discharge spaces of the respective colors can be made uniform, and only the discharge spaces of specific colors are prevented from being narrowed. As a result, it is possible to prevent luminance unevenness on the entire panel surface. In FIG. 7, the wide vertical partition formed in the next lower row is arranged with one column on the left side, but is not limited to the left side. You may arrange in.

  FIG. 8 is an example of a plan view showing only the partition wall in the present invention. The wide vertical barrier ribs 48 formed in the panel do not need to be uniformly expanded with respect to the discharge spaces formed on the left and right sides, and the width to be expanded to the left and right discharge spaces is not shown in FIG. Even an equivalent can be applied. In addition, it is not always necessary to widen the wide vertical barrier rib to the left and right, and the width of the barrier rib may be expanded only to one of the discharge spaces.

  Further, the wide vertical partition wall 48 that is unevenly expanded to the left and right does not have to be one kind in one panel, and even if wide vertical partition walls 48g and 48h having different non-uniformities are mixed. good.

  FIG. 9 is an example of a diagram showing electrodes and partitions in the present invention. The sustain electrode 2 and the scan electrode 3 that repeatedly discharge are formed from a metal electrode 50 and a transparent electrode 51. In FIG. 9, the partition walls are indicated by dotted lines. In the light emitting cell formed by the wide vertical partition 48 and having a low aperture ratio, the width of the transparent electrode 51 is expanded among the metal electrode 50 and the transparent electrode 51 constituting the sustain electrode 2 and the scan electrode 3 in the light emitting cell. In addition, by increasing the area, it is possible to improve the luminance per cell and make the luminance uniform for each subpixel. As shown in FIG. 9, when the transparent electrode 5 is expanded to the side of the horizontal barrier rib 10, the discharge gap is not changed from other subpixels, and the discharge start voltage is not changed.

  When the discharge space is narrowed by the wide vertical barrier rib 48 and the starting voltage is increased, the width of the transparent electrode 5 may be expanded so that the discharge gap is narrowed.

  In the present invention, the partition wall 52 may have a sectional shape that is tapered to a vertical shape, or a shape in which the central portion of the side wall of the partition wall is warped, and should be limited to the shape shown in FIG. There is no.

  The present invention can be applied to a plasma display panel having a partition wall having a box structure, and the effect is high particularly for the purpose of high definition and high efficiency of the panel, and industrial applicability is high. .

The disassembled perspective view of the plasma display panel in this invention. Block diagram schematically showing an example of the overall configuration of a plasma display device The figure which shows an example of the gradation drive sequence in a plasma display apparatus The figure which shows an example of the drive waveform in a plasma display apparatus The top view which shows an example of local brightness nonuniformity prevention in Example 1 The top view which shows an example of local chromaticity nonuniformity prevention in Example 1 The top view which shows an example of the chromaticity nonuniformity prevention of the panel whole surface in Example 1. FIG. The top view which showed the partition in Example 2 The top view which showed the electrode and partition in Example 3

1 Front board
2 Maintenance electrode
3 Scan electrode
4 Front substrate dielectric layer
5 Protective film
6 Back board
7 Address electrode
8 Back substrate dielectric layer
9 Row bulkhead
10 Row bulkhead
11 Phosphor layer (R)
12 Phosphor layer (G)
13 Phosphor layer (B)
14 Address drive circuit
15 Scan driver
16 Y drive circuit
17 X drive circuit
18 Control circuit
19 1 field
20 Subfield
21 Reset period
22 Address period
23 Sustain discharge period
25, 27 X voltage
26 X compensation voltage
28, 35 1st sustain pulse
29, 36 Charge polarity alignment pulse
30, 31, 37, 38 Repeated sustain pulse
32 Y writing blunt wave
33 Y compensation blunt wave
34 Scanning pulses
47 Address pulse
48, 48a ~ h Wide vertical bulkhead
49, 49a-c Narrow vertical bulkhead
50 metal electrodes
51 Transparent electrode
52 Box structure bulkhead
55 Plasma display panel

Claims (7)

A front substrate having a scan electrode group and a sustain electrode group for repeatedly discharging, and a rear substrate having an address electrode group extending in a direction intersecting the two electrode groups, the pair of front substrate and rear substrate In a plasma display panel having a vertical barrier rib and a horizontal barrier rib which are arranged between and partition the light emitting cell,
The plasma display panel according to claim 1, wherein a width of the vertical barrier rib is partially increased in units of the light emitting cells. The plasma display panel according to claim 1, wherein
In the vertical barrier rib, the number of wide vertical barrier ribs is smaller than the number of narrow vertical barrier ribs other than that. The plasma display panel according to claim 1, wherein
The plasma display panel according to claim 1, wherein the vertical barrier rib adjacent to the wide vertical barrier rib in the vertical and horizontal directions is the narrow vertical barrier rib. The plasma display panel according to claim 1, wherein
2. A plasma display panel according to claim 1, wherein, among the vertical barrier ribs, the wide vertical barrier ribs are arranged every two in the row direction of the panel. The plasma display panel according to claim 1, wherein
A plasma display panel, wherein the wide vertical barrier ribs formed in adjacent rows above and below one wide vertical barrier rib are formed in one column in the left or right direction. The plasma display panel according to claim 1, wherein
2. The plasma display panel according to claim 1, wherein, among the vertical barrier ribs, the wide vertical barrier ribs are unevenly widened to the left and right. The plasma display panel according to claim 1, wherein
The scan electrode group or the sustain electrode group has a transparent electrode, and the area of the transparent electrode in the light emitting cell having the wide vertical partition is made larger than the area of the transparent electrode in the other light emitting cell. Plasma display panel.

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