JP2011159521A - Plasma display device - Google Patents

Abstract

An object of the present invention is to improve image quality and quality of a plasma display device.
A plasma display apparatus having a data driver connected to one end of a data electrode of a plasma display panel and supplying a voltage to the data electrode, wherein the plasma display panel includes peripheral edges of the front substrate and the rear substrate. The data electrode lead-out terminal 8b is pulled out to the outside of the seal member 21, and the data electrode lead-out terminal 8b includes the seal member 21. The width of the intermediate portion 8c of the portion covered by the outer portion is made wider than the width of the other portion of the lead terminal 8b.
[Selection] Figure 8

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 constituting a driving 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. Modules are configured by arranging the substrates (see Patent Document 1), and a large screen and high definition have been promoted. However, with the spread of general households, high image quality and low consumption are being promoted. There is also a growing demand for power.

JP 2003-131580 A

  The present invention has been made in view of such a current situation, and an object thereof is to improve image quality and quality of a plasma display device.

  In order to solve this problem, the present invention is arranged so that a discharge space is formed between a front substrate in which a plurality of scan electrodes and sustain electrodes are arranged with a discharge gap therebetween, and the front substrate. And a rear substrate on which a plurality of data electrodes are arranged in a direction intersecting the scan electrode and the sustain electrode and a partition wall for partitioning the discharge space is formed, the scan electrode, the sustain electrode, the data electrode, A plasma display panel is formed by forming a plurality of discharge cells at intersections of the plasma display panel, and has a data driver connected to the data electrode lead terminal of the plasma display panel and supplying a voltage to the data electrode In the apparatus, the plasma display panel includes a gap regulating member around a peripheral portion of the front substrate and the rear substrate. A sealing member is used to seal the data electrode, and the data electrode lead-out terminal is pulled out from the sealing member. The width of the intermediate portion of the data electrode lead-out terminal covered by the seal member is increased. It is characterized by being wider than the width of the other part of the lead terminal.

  According to the present invention, when the peripheral portions of the front substrate and the rear substrate of the plasma display panel are sealed with the sealing member including the gap regulating member, a part of the lead terminal of the data electrode is crushed by the gap regulating member. In the lead terminal of the data electrode, the width of the intermediate part of the portion covered by the sealing member is made wider than the width of the other part of the lead terminal, so that it is included in the sealing member. Even if the gap regulating member to be contacted with the lead terminal of the data electrode, it is possible to prevent the lead terminal from being disconnected.

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 Sectional drawing which shows the discharge cell structure of the panel of the plasma display apparatus Similarly, a plan view showing the discharge cell structure Sectional drawing which shows the structure of the sealing part of the panel of the plasma display apparatus The top view which shows the principal part structure of the extraction terminal part of a data electrode

  Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7, but the embodiment of the present invention is not limited to this.

  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 scan electrodes 3 and sustain electrodes 4 constituting display electrodes are formed in parallel with each other with a discharge gap G therebetween. A dielectric layer 5 made of a glass material is formed so as to cover the scan electrode 3 and the sustain electrode 4, and a protective layer 6 made of MgO is formed on the dielectric layer 5. The scanning electrode 3 and the sustain electrode 4 are composed of transparent electrodes 3a and 4a such as ITO, and bus electrodes 3b and 4b made of Ag formed on the transparent electrodes 3a and 4a.

  A plurality of data electrodes 8 made of Ag arranged in stripes covered with an insulating layer 7 made of a glass material are provided on the back substrate 2, and the front substrate 1 is formed on the insulating layer 7. A partition wall 9 made of a cross-shaped glass material is provided to divide the discharge space between the rear substrate 2 and the rear substrate 2 for each discharge cell. Further, red (R), green (G), and blue (B) phosphor layers 10 are provided on the surface of the insulator layer 7 and 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 the panel 11. In the display area of the panel 11, 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 provided in the row direction. Scan electrode SC1-scan electrode SC2-sustain electrode SU2,... Are arranged, and m data electrodes D1-Dm (data electrode 8 in FIG. 1) are arranged in the column direction as scan electrodes SC1-SCn. And n sustain electrodes SU1 to SUn. A discharge cell S 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 discharge cell S is discharged. M × n are formed in the space. In addition, a non-display area is provided around the display area of the panel 11, and a plurality of dummy electrodes A (two in the illustrated example) are formed in the non-display area.

  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). Further, as shown in FIG. 2, the data electrode driving circuit 13 is connected to a lead terminal at one end of the data electrode 8 of the panel 11 and includes a plurality of data composed of semiconductor elements for supplying a voltage to the data electrode 8. It has a driver 13a. The data electrode 8 is divided into a plurality of blocks as one block by several data electrodes 8, and a plurality of data drivers 13a are connected to the electrode lead-out portion at the lower end of the panel 11 and arranged in units of the block. Yes.

  In FIG. 3, an image signal processing circuit 12 converts an 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.

  Next, the panel structure of the plasma display device according to the present invention will be described in more detail with reference to FIGS.

  FIG. 5 shows a cross-section of the panel structure of the plasma display device according to one embodiment of the present invention, and FIG. 6 shows the discharge cell structure of the panel. The same parts as those shown in FIG. is doing.

  In FIG. 5 and FIG. 6, the grid-shaped barrier rib 9 that partitions the discharge cell S includes a vertical barrier rib 9a formed parallel to the data electrode 8 and a horizontal barrier rib 9b formed perpendicular to the vertical barrier rib 9a. It is configured. The phosphor layer 10 formed by coating in the barrier rib 9 is arranged in the order of the blue phosphor layer 10B, the red phosphor layer 10R, and the green phosphor layer 10G in a stripe shape along the vertical barrier rib 9a. Is formed.

  Further, the data electrode 8 formed in a stripe pattern parallel to the vertical barrier ribs 9a of the barrier ribs 9 has a portion facing the scanning electrode 3 and the sustain electrode 4 in the discharge cell S as shown in FIG. The main electrode portion 8a has a wider width than other portions, and the main electrode portion 8a overlaps the entire area of the scan electrode 3 and the sustain electrode 4 side. In the discharge cell S, the region is arranged so as to be offset toward the scan electrode 3 so that the region overlaps with the sustain electrode 4 in a part of the range on the discharge gap G side.

  FIG. 7 shows the structure of the sealing portion of the panel, and FIG. 8 shows the main structure of the lead terminal portion of the data electrode. As shown in FIGS. 7 and 8, the panel seals the peripheral portions of the front substrate 1 and the back substrate 2 with a sealing member 21 including a glass bead 20 as a gap regulating member, and the data electrode 8 lead terminals 8b are drawn out from the sealing member 21. As shown in FIG. 8, in the lead terminal 8b of the data electrode 8, the width of the intermediate part 8c of the part covered with the sealing member 21 is made wider than the width of the other part of the lead terminal 8b. In FIG. 8, only three lead terminals 8b are shown, and the others are omitted.

  By the way, in this plasma display device, in order to reduce the price, it is necessary to reduce the price of the driving circuit for driving the panel as well as the price of the panel. As a method for reducing the price of the drive circuit, there is a method of reducing the number of parts constituting the drive circuit. As one of the methods, as shown in FIGS. 2 and 3, a voltage is applied to the data electrode of the panel. There is a so-called single scan method in which a data driver for supplying the signal is connected to only one end of the data electrode. In this single scan method, it is necessary to reduce the data current flowing through the data electrode in order to reduce the load on the data driver.

  In the present embodiment, the data electrode 8 has a main electrode portion 8a in which a portion in the discharge cell S is configured wider than other portions, and the main electrode portion 8a is on the side of the scan electrode 3 In the discharge cell S, the scanning electrode 3 overlaps with the scanning electrode 3 in the entire range and the sustaining electrode 4 side region overlaps with the sustaining electrode 4 in a partial range on the discharge gap G side. It is a configuration that is offset from the electrode 3 side, and by reducing the width of the portion other than the main electrode portion 8a used for discharging the panel, the data current flowing through the data electrode 8 during the write period can be reduced, Thereby, low power consumption can be achieved.

  Further, when the peripheral portions of the front substrate 1 and the rear substrate 2 of the plasma display panel are sealed by the sealing member 21 including the beads 20 as the gap regulating member, a part of the lead terminal 8b of the data electrode 8 is formed by the beads 20. In the present invention, the width of the intermediate portion 8c of the portion covered with the sealing member 21 in the lead terminal 8b of the data electrode 8 is set to the other portion of the lead terminal 8b. Even if the beads 20 included in the sealing member 21 hit the lead terminal 8b of the data electrode 8, the lead terminal 8b can be prevented from being disconnected.

  As described above, the present invention is useful in providing a plasma display device with high image quality and low power consumption.

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Scan electrode 4 Sustain electrode 5 Dielectric layer 6 Protective layer 7 Insulator layer 8 Data electrode 8a Main electrode part 9 Partition 10 Phosphor layer 11 Panel 20 Bead 21 Sealing member G Discharge gap S Discharge cell A dummy electrode

Claims (1)

A front substrate having a plurality of scan electrodes and sustain electrodes arranged with a discharge gap therebetween, and the front substrate are arranged to face each other so as to form a discharge space and intersect the scan electrodes and sustain electrodes. A plurality of data electrodes arranged in a direction and a rear substrate on which barrier ribs defining the discharge space are formed, and a plurality of discharge cells are formed at intersections of the scan electrodes, the sustain electrodes, and the data electrodes. A plasma display panel comprising a data driver connected to a lead terminal of the data electrode of the plasma display panel and supplying a voltage to the data electrode. While sealing the peripheral portion of the substrate and the back substrate with a sealing member including a gap regulating member, The data electrode lead-out terminal is drawn out from the sealing member, and the width of the intermediate portion of the data electrode lead-out terminal covered by the seal member is larger than the width of the other part of the lead-out terminal. A plasma display device characterized by being widened.

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