JP2011119089A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel that reduces the occurrence of the failures such as chips or cracks to a partition wall formed, thereby achieving more satisfactory image display. <P>SOLUTION: The plasma display panel includes a discharge space sandwiched by a back substrate 2 where the partition wall 9 is formed, and a front substrate facing the back substrate 2. The plasma display panel also includes a partition wall 54 for strength test to measure strength of the partition wall 9 outside an image display region 52 of the back substrate 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plasma display panel (hereinafter referred to as a panel) which is a display device.

Panels are broadly divided into AC type and DC type in terms of driving, and there are two types of discharge types: surface discharge type and counter discharge type. Then, the surface discharge type of the three-electrode structure is the mainstream.
In this surface discharge type panel structure, at least a pair of substrates transparent at least on the front side are arranged to face each other so that a discharge space is formed between the substrates, and partition walls for dividing the discharge space into a plurality are arranged on the substrate. In addition, a plurality of discharge cells are configured by arranging an electrode group on the substrate so that discharge is generated in a discharge space partitioned by the partition walls, and providing phosphors that emit red, green, and blue light emitted by discharge. It is. A phosphor is excited by vacuum ultraviolet light having a short wavelength generated by discharge, and red, green, and blue visible light is emitted from red, green, and blue discharge cells, respectively, to perform color display.

  Such a panel is capable of high-speed display compared to a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and is self-luminous, so the display quality is high. Recently, it has attracted particular attention among panel displays. It is used for various purposes as a display device at a place where many people gather or a display device for enjoying a large screen image at home.

  And such a panel made of metal such as aluminum is held on the front side of the chassis member, and on the back side of the chassis member, a circuit board constituting a drive circuit for causing the panel to emit light is disposed, A plasma display device is configured (see Patent Document 1).

JP 2003-131580 A

By the way, in the panel, it is necessary to form the partition wall thinner as the definition becomes higher. Therefore, there is a problem that defects such as chipping and cracking are likely to occur in the partition wall.
The present invention has been made in view of such a situation, and an object of the present invention is to realize a panel capable of reducing the occurrence of defects such as chipping and cracking with respect to a formed partition wall and thereby displaying a good image.

  In order to achieve the above object, the panel of the present invention is a plasma display panel having a discharge space sandwiched between a rear substrate on which a partition wall is formed and a front substrate facing the rear substrate. A strength test partition for measuring the strength of the partition is provided outside.

According to the present invention, during the panel manufacture, by measuring the strength of the strength test partition provided outside the image display region of the back substrate, the strength of the partition in the image display region is known, thereby In the process, it can be predicted whether or not defects such as chipping or cracking are likely to occur in the partition walls.
Therefore, it is possible to reduce the occurrence of defects such as chipping and cracking in the subsequent manufacturing process or the manufactured panel by selecting a material having good partition strength and performing the post-process. Thus, a panel capable of displaying a good image can be manufactured with a high yield.

It is a perspective view which shows the principal part of the panel by one embodiment of this invention. It is an electrode array figure of the panel. It is a circuit block diagram of the plasma display apparatus comprised using the panel by one embodiment of this invention. It is a wave form diagram which shows the drive voltage waveform applied to each electrode of the panel by one embodiment of this invention. It is a disassembled perspective view which shows the whole structure of the plasma display apparatus comprised using the panel by one embodiment of this invention. It is a top view which shows an example of the arrangement | positioning which looked at the plasma display apparatus comprised using the panel by one embodiment of this invention from the back side. It is a top view which shows the pattern of the dummy partition concerning embodiment of this invention. It is a top view which shows the pattern of the dummy partition concerning embodiment of this invention. It is a figure which shows an example of the dummy partition which changed the top part width | variety in steps.

Hereinafter, a panel according to an embodiment of the present invention will be described with reference to FIGS. The embodiment of the present invention is not limited to this.
As shown in FIG. 1, the panel is configured by disposing a glass front substrate 1 and a back substrate 2 so as to form a discharge space therebetween. On the front substrate 1, a plurality of scanning electrodes 3 and sustaining electrodes 4 constituting display electrodes are formed in parallel with each other. A dielectric layer 5 is formed so as to cover the scan electrodes 3 and the sustain electrodes 4, and a protective layer 6 is formed on the dielectric layer 5.

A plurality of data electrodes 8 covered with an insulator layer 7 are provided on the back substrate 2, and a grid-like partition wall 9 is provided on the insulator layer 7. A phosphor layer 10 is provided on the surface of the insulator layer 7 and on the side surfaces of the partition walls 9. The front substrate 1 and the rear substrate 2 are arranged to face each other so that the scan electrodes 3 and the sustain electrodes 4 and the data electrodes 8 cross each other, and in the discharge space formed therebetween, for example, neon And a mixed gas of xenon. Note that the structure of the panel is not limited to the above-described structure, and for example, a structure having a stripe-shaped partition may be used.
The panel having the above-described configuration can be manufactured by manufacturing the front substrate 1 and the back substrate 2, respectively, arranging the two facing each other, sealing them, and enclosing the discharge gas.

  FIG. 2 is an electrode array diagram of this panel. N scan electrodes SC1 to SCn (scan electrode 3 in FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrode 4 in FIG. 1) are arranged in the row direction, and m data electrodes D1 to D1 are arranged in the column direction. Dm (data electrode 8 in FIG. 1) is arranged. A discharge cell is formed at a portion where a pair of scan electrode SCi and sustain electrode SUi (i = 1 to n) and one data electrode Dj (j = 1 to m) intersect, and the discharge cell is in the discharge space. M × n are formed.

FIG. 3 is a circuit block diagram of a plasma display device using this panel. The plasma display device includes a panel 11, an image signal processing circuit 12, a data electrode drive circuit 13, a scan electrode drive circuit 14, a sustain electrode drive circuit 15, a timing generation circuit 16, and a power supply circuit (not shown).
The image signal processing circuit 12 converts the image signal sig into image data for each subfield. The data electrode driving circuit 13 converts the image data for each subfield into signals corresponding to the data electrodes D1 to Dm, and drives the data electrodes D1 to Dm. The timing generation circuit 16 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 14 supplies drive voltages to scan electrodes SC1 to SCn based on timing signals, and sustain electrode drive circuit 15 supplies drive voltages to sustain electrodes SU1 to SUn based on timing signals. Here, the scan electrode drive circuit 14 and the sustain electrode drive circuit 15 include a sustain pulse generator 17.

Next, a driving voltage waveform for driving the panel 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 panel.
In the plasma display device according to the present embodiment, one field is divided into a plurality of subfields, and each subfield has an initialization period, a writing period, and a sustain period.

  In the initializing period of the first subfield, data electrodes D1 to Dm and sustain electrodes SU1 to SUn are held at 0 (V), and voltage Vi1 (V) that is equal to or lower than the discharge start voltage with respect to scan electrodes SC1 to SCn. A ramp voltage that gradually rises is applied to a voltage Vi2 (V) that exceeds the discharge start voltage. Then, the first weak initializing discharge is caused in all the discharge cells, negative wall voltage is stored on scan electrodes SC1 to SCn, and positive on sustain electrodes SU1 to SUn and data electrodes D1 to Dm. Wall 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 SU1 to SUn 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 SC1 to SCn. Then, the second weak initializing discharge is caused in all the discharge cells, the wall voltage between scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn is weakened, and the wall voltage on data electrodes D1 to Dm is reduced. Is also adjusted to a value suitable for the write operation.

  In the subsequent writing period, scan electrodes SC1 to SCn are temporarily held at Vr (V). Next, negative scan pulse voltage Va (V) is applied to scan electrode SC1 in the first row, and data electrode Dk (k = 1 to 1) of the discharge cell to be displayed in the first row among data electrodes D1 to Dm. A positive write pulse voltage Vd (V) is applied to m). At this time, the voltage at the intersection between the data electrode Dk and the scan electrode SC1 is obtained by adding the wall voltage on the data electrode Dk and the wall voltage on the scan electrode SC1 to the externally applied voltage (Vd−Va) (V). And the discharge start voltage is exceeded. Then, a write discharge occurs between data electrode Dk and scan electrode SC1 and between sustain electrode SU1 and scan electrode SC1, and a positive wall voltage is accumulated on scan electrode SC1 of this discharge cell, and on sustain electrode SU1. And a negative wall voltage is also accumulated on the data electrode Dk.

  In this way, an address operation is performed in which an address discharge is caused in the discharge cells to be displayed in the first row and a wall voltage is accumulated on each electrode. On the other hand, the voltage at the intersection of the data electrodes D1 to Dm to which the write pulse voltage Vd (V) is not applied and the scan electrode SC1 does not exceed the discharge start voltage, so no write discharge occurs. The above address operation is sequentially performed until the discharge cell in the nth row, and the address period ends.

  In the subsequent sustain period, positive sustain pulse voltage Vs (V) is applied to scan electrodes SC1 to SCn as a first voltage, and ground potential, that is, 0 (V) is applied to sustain electrodes SU1 to SUn as a second voltage. Apply. In the discharge cell in which an address discharge has occurred at this time, the voltage between scan electrode SCi and sustain electrode SUi is the sustain pulse voltage Vs (V), the wall voltage on scan electrode SCi and the wall on sustain electrode SUi. The voltage is added and exceeds the discharge start voltage. Then, a sustain discharge occurs between scan electrode SCi and sustain electrode SUi, and the phosphor layer emits light due to the ultraviolet rays generated at this time. Then, a negative wall voltage is accumulated on scan electrode SCi, and a positive wall voltage is accumulated on sustain electrode SUi. At this time, a positive wall voltage is also accumulated on the data electrode Dk.

  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 SC1 to SCn, and sustain pulse voltage Vs (V) that is the first voltage is applied to sustain electrodes SU1 to SUn. Then, in the discharge cell in which the sustain discharge has occurred, the voltage between the sustain electrode SUi and the scan electrode SCi exceeds the discharge start voltage, so that the sustain discharge occurs again between the sustain electrode SUi and the scan electrode SCi, Negative wall voltage is accumulated on sustain electrode SUi, and positive wall voltage is accumulated on scan electrode SCi.

Similarly, the sustain discharge continues in the discharge cells that have caused the write discharge in the write period by alternately applying the number of sustain pulses corresponding to the luminance weight to the scan electrodes SC1 to SCn and the sustain electrodes SU1 to SUn. Done. Thus, the maintenance operation in the maintenance period is completed.
The operations in the initialization period, the writing period, and the sustain period in the subsequent subfield are almost the same as those in the first subfield, and thus the description thereof is omitted.

FIG. 5 shows an example of the overall configuration of the plasma display device incorporating the panel having the structure described above, and FIG. 6 shows an example of the arrangement of the drive circuit blocks as viewed from the back side.
On the front side of the chassis member 21 serving as a holding plate that also serves as a heat sink made of metal such as aluminum, a panel 11 has a heat dissipation sheet (not shown in FIG. 5) interposed between the panel 11 and the chassis member 21. It is held by bonding with an adhesive or the like. Further, as shown in FIG. 6, a plurality of drive circuit blocks for driving the panel 11 are arranged on the rear side of the chassis member 21, thereby constituting a module.

  Here, the heat-dissipating sheet is for adhering and holding the panel 11 on the front side of the chassis member 21, efficiently transferring heat generated in the panel 11 to the chassis member 21, and performing heat dissipation. Is about 1 mm to 2 mm. As this heat radiating sheet, an insulating heat radiating sheet in which a synthetic resin material such as acrylic, urethane, silicon resin, or rubber contains a filler that enhances thermal conductivity, a graphite sheet, a metal sheet, or the like can be used. Further, the heat radiation sheet itself has an adhesive force, and the panel 11 is bonded to the chassis member 21 with only the heat radiation sheet, or the heat radiation sheet has no adhesive force and is separately provided with a double-sided adhesive tape or the like. The structure etc. which adhere | attach 11 to the chassis member 21 can be used.

In addition, flexible wiring boards 22 as display electrode wiring members connected to the electrode lead portions of the scan electrodes 3 and the sustain electrodes 4 are provided on both side edges of the panel 11, and the rear side passes through the outer periphery of the chassis member 21. And connected to the drive circuit block 23 of the scan electrode drive circuit 14 and the drive circuit block 24 of the sustain electrode drive circuit 15 via a connector.
On the other hand, the lower and upper edges of the panel 11 are provided with a plurality of flexible wiring boards 25 as data electrode wiring members connected to the electrode lead portions of the data electrodes 8, and the flexible wiring boards 25 are The plurality of data drivers 26 of the data electrode driving circuit 13 are electrically connected to each other, routed to the back side through the outer periphery of the chassis member 21, and disposed at the lower and upper positions on the back side of the chassis member 21. The data electrode drive circuit 13 is electrically connected to the drive circuit block 27.

  The control circuit block 28 displays image data on the basis of a video signal sent from an input signal circuit block 29 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. 11 is converted into an image data signal corresponding to the number of pixels of 11 and supplied to the drive circuit block 27 of the data electrode drive circuit, and a discharge control timing signal is generated. This is supplied to the drive circuit block 24 of the drive circuit 15 and performs display drive control such as gradation control, and is arranged at substantially the center of the chassis member 21.

  The power supply block 30 supplies a voltage to each of the circuit blocks. Like the control circuit block 28, the power supply block 30 is disposed at a substantially central portion of the chassis member 21, and is commercialized through a connector to which a power supply cable (not shown) is attached. A power supply voltage is supplied. These drive circuit blocks 23, 24, 27, control circuit block 28, input signal circuit block 29, and power supply block 30 are fixed to the boss portion provided on the back side of the chassis member 21 with screws or the like.

  Further, a cooling fan 31 is disposed in the vicinity of the drive circuit blocks 23 and 24 while being held at an angle 32 so that the drive circuit blocks 23 and 24 are cooled by the wind sent from the cooling fan 31. It is configured. Further, the drive circuit block 27 of the data electrode drive circuit 13 disposed at the upper position is cooled at the upper position of the chassis member 21, and on the rear side of the chassis member 21, the entire apparatus is moved from the lower portion toward the upper portion. Three cooling fans 33 are arranged to cool the inside of the apparatus by causing an air flow.

Further, reinforcing angles 34 and 35 are fixed to the chassis member 21 in a horizontal direction and a vertical direction, and the angle 34 arranged in the horizontal direction is a stand for holding the apparatus in an upright state. The pole 36 is fixed with screws or the like.
The module having the above structure is housed in a housing having a front protective cover 37 disposed on the front side of the panel 11 and a metal back cover 38 disposed on the rear side of the chassis member 21. This completes the plasma display device. Here, the front protective cover 37 is attached to the front frame 39 made of resin or metal having an opening 39a from which the image display area on the front side of the panel 11 is exposed, and the opening 39a of the front frame 39, and It is a structure provided with the protective plate 40 which consists of glass etc. in which the unnecessary radiation suppression film | membrane for suppressing the unnecessary radiation of an optical filter and electromagnetic waves was provided. The protective plate 40 is attached to the front frame 39 by sandwiching the peripheral portion of the protective plate 40 between the peripheral edge of the opening 39a of the front frame 39 and a protective plate pressing bracket (not shown). Further, the back cover 38 is provided with a plurality of vent holes (not shown) for releasing heat generated by the module to the outside.

In FIG. 5, reference numeral 41 denotes a screw for attaching the back cover 38 to the chassis member 21, and 42 denotes a gripping part attached to the back cover 38 with a screw or the like.
Next, features of the panel according to the embodiment of the present invention will be described in detail below.
FIG. 7 is a plan view showing a schematic configuration of the back substrate in the panel according to the embodiment of the present invention. As shown in FIG. 7, the panel according to the embodiment of the present invention has a strength test partition 54 for measuring the strength of the partition 9 in the image display region 52 outside the image display region 52 of the back substrate 2. (Hereinafter, a dummy partition wall 54) is provided.
Then, after the partition wall 9 and the dummy partition wall 54 are formed, the strength of the partition wall 9 in the image display area 52 can be relatively known by performing a strength test using the dummy partition wall 54.
Here, if the strength of the partition wall 9 is small, the partition wall 9 is likely to be chipped or cracked. That is, although the malfunction which becomes the cause of an erroneous discharge of a panel is easy to generate | occur | produce, since the intensity | strength of the partition 9 can be known from the intensity | strength of the dummy partition 54 as mentioned above, malfunctions, such as a crack of a partition 9, and a crack generate | occur | produce. It becomes possible to remove the rear substrate 2 having a high possibility in advance.
From the viewpoint of knowing the strength of the partition wall 9 from the strength of the dummy partition wall 54, it is important to form the dummy partition wall 54 simultaneously with the partition wall 9, that is, to form the same material with the same method. Also, it is desirable that the dummy partition wall 54 and the partition wall 9 be the same.
According to the above method, since the strength inspection is performed using the dummy partition wall 54, a destructive inspection can be performed, so that a more realistic strength of the partition wall 9 can be obtained.
Here, as a method of the destructive inspection, for example, a method of knowing the pressure strength of the partition wall 9 in the image display region 52 by uniformly applying pressure to the dummy partition wall 54 using a pressurizing device, or a sandblasting device is used. For example, a method of knowing the strength of the partition wall 9 against pressure and impact received from various angles by causing the abrasive grains to collide with the dummy partition wall 54 can be used.
In the method using the sandblasting apparatus, although the abrasive grains collide with the dummy partition wall 54 outside the image display area 52, the abrasive grains are mixed into the image display area and the image display is not performed. The occurrence of problems such as adverse effects is also assumed. Therefore, in order to eliminate the occurrence of such a problem, a method of masking and blasting the image display area, or a material that does not easily affect discharge, such as alumina or glass beads, is used as the abrasive material. It is considered desirable to adopt a method.
In addition, it is desirable that the grain size of the abrasive grains be smaller than the top width of the dummy partition wall 54 so that an impact can be applied to the dummy partition wall 54 from any angle.
Further, in the panel according to the embodiment of the present invention described above, an example in which the dummy partition wall 54 and the partition wall 9 are separately provided has been shown, but the present invention is not limited to such a configuration. As shown in FIG. 8, the dummy partition wall 54 may be formed continuously with the partition wall 9. In the structure as shown in FIG. 8, the dummy partition 54 is formed in a state of being continuous with the partition 9 in the strength image display area 52, so that the partition 9 in the image display area 52 is formed. The effect that the correlation with the intensity can be further increased can be obtained.
Further, in the panel according to the embodiment of the present invention described above, an example in which the dummy partition wall 54 and the partition wall 9 are formed to have the same shape has been shown. The shape of 54 may be a shape in which chipping or cracking occurs more easily than the partition wall 9. Examples of such a shape include a shape in which the top width of the dummy partition wall 54 is made narrower than the top width of the partition wall 9.
Further, in order to reliably measure the strength, by gradually changing the top width of the dummy partition wall 54 as shown in FIG. 9, in the partition strength inspection, as the impact is increased, the partition wall gradually falls from the narrower top width. It will be. Therefore, it is effective in that the strength of the partition walls can be known relatively reliably.
In order to eliminate the possibility of panel floating when the front substrate 1 and the rear substrate 2 are bonded together, it is effective to form the dummy partition walls 54 lower than the partition walls 9.
As described above, according to the panel of the embodiment of the present invention, the dummy partition is provided outside the image display region for the purpose of measuring the strength of the partition in the image display region, and a destructive inspection is performed using this dummy partition. The rear substrate provided with the partition wall determined to have a predetermined strength or less can be extracted in advance.
Therefore, in the subsequent panel manufacturing process, when the front substrate and the rear substrate are sealed, the rear substrate having a partition wall with inferior strength is not used. As a result, the occurrence of defects such as chipping or cracking in the partition walls in the manufactured panel is greatly reduced, and a panel capable of displaying a good image can be realized.

  As described above, the present invention is useful for providing a large-screen, high-definition panel.

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 9 Partition 52 Image display area 54 Dummy partition

Claims (10)

In a plasma display panel having a discharge space sandwiched between a rear substrate on which barrier ribs are formed and a front substrate facing the rear substrate,
A plasma display panel comprising a strength test partition for measuring the strength of the partition by a strength test outside the image display area of the rear substrate.   The plasma display panel of claim 1, wherein the strength test barrier rib is formed continuously with the barrier rib.   3. The plasma display panel according to claim 1, wherein the strength test partition is formed lower than a height of the partition.   The plasma display panel according to any one of claims 1 to 3, wherein the strength test partition wall has a shape whose strength is weaker than that of the partition wall.   The plasma display panel according to any one of claims 1 to 4, wherein the strength test partition has a top width narrower than a top width of the partition.   The plasma display panel according to any one of claims 1 to 5, wherein the strength test partition wall has a top width that changes stepwise from a top width of the partition wall.   The plasma display panel according to claim 1, wherein the strength test is a method of applying pressure uniformly to the partition using a pressurizing device.   The plasma display panel according to claim 1, wherein the strength test is a method in which abrasive grains collide with the partition using a sandblasting apparatus.   9. The plasma display panel according to claim 8, wherein a particle size of the abrasive grains is smaller than a top width of the strength test partition wall.   The plasma display panel according to claim 8 or 9, wherein the material of the abrasive grains is alumina or glass beads.

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