JP2007121829A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device suitable for screen enlargement and high definition. <P>SOLUTION: The plasma display device includes; a chassis member 21 which has a panel 11 held on the front side and has a driving circuit block for driving the panel 11, disposed on the rear side; and a plurality of flexible circuit boards 25 which are routed through an outer peripheral part of the chassis member 21 and electrically connect a data electrode of the panel 11 to the driving circuit blocks. The chassis member 21 includes a metallic base plate 43 having the panel 11 attached thereto and a metallic plate 45 which is arranged while being put on a peripheral edge part on the rear side of the base plate 43 and has a plurality of projecting parts provided in positions between flexible circuit boards, and the projecting parts of the metallic plate 45 have shapes of which the width is made narrower from coupling parts to the metallic plate 45 toward the outside. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Panels used in this plasma display device are roughly classified 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. Due to the simplicity of manufacturing, at present, the mainstream of plasma display devices is a surface discharge type having a three-electrode structure.

  In this surface discharge type plasma display panel structure, at least a pair of substrates whose front sides are transparent are arranged to face each other so that a discharge space is formed between the substrates, and partition walls for dividing the discharge space into a plurality of substrates are arranged on the substrate. In addition, a plurality of discharge cells are configured by arranging an electrode group on the substrate so that a discharge is generated in the discharge space partitioned by the barrier ribs, and providing phosphors that emit red, green, and blue light emitted by the discharge. However, phosphors are 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 plasma display device can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to enlarge, and is self-luminous so that the display quality is high. Recently, the flat panel display has attracted particular attention and is used for various purposes as a display device in a place where many people gather and a display device for enjoying a large screen image at home.

In such a plasma display device, a circuit that constitutes a drive circuit for holding a panel made mainly of glass on the front side of a chassis member made of metal such as aluminum and causing the panel to emit light on the back side of the chassis member. A module is configured by arranging a substrate (see Patent Document 1).
JP 2003-131580 A

  By the way, in the plasma display device, since it is easy to realize a large screen, products having a size of 65 inches or more have been manufactured and sold in recent years. In addition, as demand for higher-definition displays increases, products with higher definition of 1080 × 1920 are manufactured from products with a definition of 768 × 1366, which has been the mainstream until now.

  As the plasma display device is increased in screen size and resolution, the parts constituting the product need to be reviewed.

  The present invention has been made in view of such a current situation, and an object thereof is to provide a plasma display device suitable for a large screen and high definition.

  In order to solve this problem, the present invention is arranged so that a discharge space is formed between a front substrate on which a plurality of display electrodes are arranged and a rear substrate on which data electrodes are arranged so as to intersect the display electrodes. A plasma display panel, a chassis member that holds the plasma display panel on the front side and a driving circuit block for driving the plasma display panel on the back side, and is routed through the outer periphery of the chassis member and A plurality of display electrode wiring members that electrically connect display electrodes of the plasma display panel to the drive circuit block, and the plasma electrode is routed through the outer periphery of the chassis member at a position different from the display electrode wiring members. Electrical connection of display panel data electrodes to the drive circuit block A plurality of data electrode wiring members, and the chassis member is disposed in a state of being superimposed on a metal base plate to which a plasma display panel is attached and a peripheral portion on the back side of the base plate; A metal plate provided with a plurality of protrusions at positions between the data electrode wiring members, and the protrusions of the metal plate have a shape that narrows outward from the coupling portion with the metal plate. It is characterized by.

  According to the present invention, it is possible to easily obtain a chassis member having a predetermined strength even when the panel is enlarged, and for the protrusions provided on the chassis member, the interval is reduced by increasing the number of wiring members. In addition, since the joint portion with the metal plate can secure a predetermined width compared to the tip portion, it is possible to provide a protrusion with a predetermined strength, which makes it suitable for a large screen and high definition. A device can be obtained.

  Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8, but the embodiment of the present invention is not limited thereto.

  First, the structure of the panel in the plasma display device will be described with reference to FIG. 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 electrode 3 and the sustain electrode 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 between them, 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.

  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 drive 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 voltage waveforms to scan electrodes SC1 to SCn based on timing signals, and sustain electrode drive circuit 15 supplies drive voltage waveforms 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, an address period, and a sustain period.

  In the initializing period of the first subfield, the data electrodes D1 to Dm and the sustain electrodes SU1 to SUn are held at 0 (V), and from the voltage Vi1 (V) that is lower than the discharge start voltage with respect to the scan electrodes SC1 to SCn A ramp voltage that gradually increases toward the voltage Vi2 (V) exceeding the discharge start voltage is applied. Then, the first weak initializing discharge is caused in all the discharge cells, negative wall voltages are stored on scan electrodes SC1 to SCn, and positive walls on sustain electrodes SU1 to SUn and data electrodes D1 to Dm. The voltage is stored. Here, the wall voltage on the electrode refers to a voltage generated by wall charges accumulated on the dielectric layer or the phosphor layer covering the electrode.

  Thereafter, sustain electrodes 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 address 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, an address 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 manner, an address operation is performed in which address discharge is caused in the discharge cells to be displayed in the first row and wall voltage is accumulated on each electrode. On the other hand, the voltage at the intersection of the data electrodes D1 to Dm and the scan electrode SC1 to which the address pulse voltage Vd (V) is not applied does not exceed the discharge start voltage, so that address discharge does not occur. The above address operation is sequentially performed until the discharge cell in the nth row, and the address period ends.

  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 the 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 voltage on sustain electrode SUi. 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.

  Thereafter, similarly, by applying sustain pulses of the number corresponding to the luminance weight alternately to scan electrodes SC1 to SCn and sustain electrodes SU1 to SUn, the sustain discharge continues in the discharge cells that have caused the address discharge in the address period. Done. Thus, the maintenance operation in the maintenance period is completed.

  The operations in the initialization period, address period, and sustain period in the subsequent subfield are substantially the same as those in the first subfield, and thus description thereof is omitted.

  FIG. 5 shows an example of the overall configuration of a plasma display device incorporating the panel having the structure described above, and FIG. 6 shows an example of the arrangement of drive circuit blocks as viewed from the back side.

  In the figure, 21 is a chassis member as a holding plate that also serves as a heat sink made of metal such as aluminum. On the front side of the chassis member 21, a panel 11 is placed between the chassis member 21 and a heat dissipation sheet (see FIG. 5). (Not shown) 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. In addition, the heat radiation sheet itself has an adhesive force, and the panel 11 is bonded to the chassis member 21 only by the heat radiation sheet, or the heat radiation sheet has no adhesive force, and another double-sided adhesive tape is used. The structure etc. which adhere | attach can be used for 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 connectors.

  On the other hand, a plurality of flexible wiring boards 25 as data electrode wiring members connected to the electrode lead portions of the data electrodes 8 are provided on the lower and upper edges of the panel 11, and the flexible wiring boards 25 are connected to The plurality of data drivers 26 of the electrode drive 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 drive circuit block 27 of the data electrode drive circuit 13 is electrically connected.

  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 11 and supplied to the drive circuit block 27 of the data electrode drive circuit, and a discharge control timing signal is generated, and the drive circuit block 23 and the sustain electrode of the scan electrode drive circuit 14 are 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 the horizontal direction and the 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 And a protective plate 40 made of glass or the like provided with an unnecessary radiation suppressing film for suppressing unnecessary radiation of an optical filter or electromagnetic wave, and the protective plate 40 has a front frame around the periphery of the protective plate 40. It is attached to the front frame 39 by being sandwiched between the peripheral edge portion of the opening 39 a of 39 and a protective plate pressing metal fitting (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, the chassis member 21 of the plasma display device according to the present embodiment will be described in more detail with reference to FIG. 7A is a plan view showing the chassis member 21, FIG. 7B is a cross-sectional view taken along line XX in FIG. 7A, and FIG. 7C is a cross-sectional view taken along line Y- in FIG. It is sectional drawing cut | disconnected by the Y line.

  As shown in FIG. 7, the chassis member 21 includes a metal base plate 43 made of an aluminum plate to which the panel 11 is attached, and an aluminum plate arranged in a state of being overlapped with a peripheral portion on the back side of the base plate 43. The base plate 43 is provided with the reinforcing angles 34 and 35 described above. The metal plate 44 is mounted on both the left and right sides where the drive circuit blocks 23 and 24 of the scan electrode drive circuit 14 and the sustain electrode drive circuit 15 are arranged, while the metal plate 45 is a data driver of the data electrode drive circuit 13. 26 and the drive circuit block 27 are attached in an overlapping manner at the upper and lower positions. In FIG. 7A, the metal plates 44 and 45 are indicated by hatching.

  As shown in FIG. 8, the metal plate 44 is provided with a plurality of protrusions 44 a so as to be disposed between the flexible wiring boards 22 disposed on the left and right sides of the chassis member 21. The front protective cover 37 is attached to the chassis member 21 by attaching the front frame 39 of the front protective cover 37 constituting the casing to the portion 44a. On the other hand, as shown in FIG. 8, the metal plate 45 has a plurality of protrusions 45a so as to be disposed between the flexible wiring boards 25 as the data electrode wiring members arranged at the upper and lower positions of the chassis member 21. Furthermore, the protruding portion 45a of the metal plate 45 has a shape whose width becomes narrower toward the outside from the joint portion with the metal plate 45. FIG. 8 is an enlarged view of an arrow A portion in FIG.

  Further, the chassis member 21 has a configuration in which the metal plates 44 and 45 are provided on the periphery of the base plate 43 so as to reinforce the periphery without subjecting the base plate 43 to processing such as press molding. It can be performed. In addition, a step g corresponding to the thickness of the base plate 43 is provided between the base plate 43 and the metal plates 44 and 45, thereby transporting the chassis member 21 in the assembly process of the plasma display device. At this time, the chassis member 21 can be easily transported by using the protruding portions 44a and 45a of the metal plates 44 and 45 so as to be hooked on the jig of the transport device.

  By the way, in the plasma display device, since it is easy to realize a large screen, products having a size of 65 inches or more have been manufactured and sold in recent years. In addition, as demand for higher-definition displays increases, products with higher definition of 1080 × 1920 are manufactured from products with a definition of 768 × 1366, which has been the mainstream until now.

  When manufacturing a plasma display device with a large screen in this way, naturally, the size and shape of the chassis member 21 will increase, but until now it has been given a predetermined strength by, for example, pressing an aluminum plate. In the configuration, a new problem that it is difficult to perform highly accurate molding occurs. Further, in the assembly process of the plasma display device, the projection provided on the chassis member 21 when the chassis member 21 is held in each process such as the attachment of the panel 11 to the chassis member 21 and the attachment of the drive circuit block to the chassis member 21. However, as the product becomes higher in definition, the problem that the space for providing the protruding portion on the chassis member 21 is restricted has also occurred. In particular, at the upper and lower positions where the wiring members for the data electrodes are arranged, the number of 1366 pixels becomes 1920, so that about 1.4 times the number of data drivers on the same size side as before. 26 is required, and the interval between the flexible wiring boards 25 is reduced.

  In the present invention, as described above, the chassis member 21 includes the metal base plate 43 to which the panel 11 is attached and the metal plate disposed in a state where the chassis member 21 is overlapped with the peripheral portion on the back side of the base plate 43. 44 and 45, and the plurality of protrusions 45a provided at positions between the flexible wiring boards 25 on the data electrode side have a shape in which the width becomes narrower outward from the coupling portion with the metal plate 45. Even if the panel 11 is enlarged, the chassis member 21 having a predetermined strength can be easily obtained, and the protrusion 45a provided on the chassis member 21 can be spaced by increasing the number of flexible wiring boards 25. Even if it becomes narrower, since the joint portion with the metal plate 45 can ensure a predetermined width compared to the tip portion, it is possible to provide a protrusion 45a having a predetermined strength.

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

The perspective view which shows the principal part of the panel used for the plasma display apparatus by one embodiment of this invention. Electrode arrangement of the panel Circuit block diagram of the plasma display device Waveform diagram showing drive voltage waveform applied to each electrode of panel Exploded perspective view showing the entire configuration of the plasma display device The top view which shows an example of arrangement | positioning which looked at the same plasma display apparatus from the back side (A) Plan view showing chassis member, (b) Cross-sectional view cut along XX line, (c) Cross-sectional view cut along Y-Y line Enlarged view of part A in FIG.

Explanation of symbols

11 Panel 21 Chassis member 22, 25 Flexible wiring board 23, 24, 27 Drive circuit block 26 Data driver 43 Base plate 44, 45 Metal plate 45a Projection

Claims (1)

A plasma display panel in which a front substrate on which a plurality of display electrodes are arranged and a rear substrate on which data electrodes are arranged so as to intersect the display electrodes are opposed to each other so that a discharge space is formed therebetween, and the plasma display panel A chassis member having a driving circuit block held on the front side and a driving circuit block for driving the plasma display panel on the back side, and a display electrode of the plasma display panel routed through an outer periphery of the chassis member and the driving circuit block And a plurality of display electrode wiring members electrically connected to the display electrode wiring member, the data electrodes of the plasma display panel being routed through the outer periphery of the chassis member at positions different from the display electrode wiring members. With multiple data electrode wiring members to be electrically connected The chassis member is disposed in a state of being superimposed on a metal base plate to which the plasma display panel is attached and a peripheral portion on the back side of the base plate, and a plurality of positions are provided between the data electrode wiring members. A plasma display device comprising: a metal plate provided with a projecting portion, and the projecting portion of the metal plate having a shape narrower toward the outside from a joint portion with the metal plate.

Images