JP2010055913A - Plasma display panel and plasma display apparatus - Google Patents

Abstract

An object of the present invention is to realize a PDP exceeding 100 inches capable of good image display by dividing a circuit for driving a large panel without risk of circuit destruction and solving the luminance unevenness of the panel. .
A plasma display panel in which a front substrate on which a plurality of scan electrodes and a plurality of sustain electrodes covered with a dielectric are formed, and a rear substrate on which write electrodes and barrier ribs are formed are opposed to each other. The plurality of sustain electrodes 5 are divided into at least two equal groups, and each group includes connection portions C1 and C2 for electrically connecting the sustain electrodes, and the connection portions C1 and C2 The plasma display panel is characterized in that each group is electrically separated from each other and connected to different circuits.
[Selection] Figure 1

Description

  The present invention relates to a plasma display panel.

  Plasma display panels (hereinafter also referred to as PDPs) are roughly classified into AC types and DC types in terms of driving, and there are two types of discharge types: surface discharge type and counter discharge type. From the viewpoint of simplicity of screen display and manufacturing, a surface discharge type PDP having a three-electrode structure is currently mainstream.

  In this surface discharge type PDP 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, a discharge gas is sealed in the discharge space, and the discharge A partition wall for partitioning the space is arranged on the substrate, and an electrode group is arranged on the substrate so that discharge is generated in the discharge space partitioned by the partition wall, and light is emitted in red, green, and blue light emitted by the discharge. A plurality of discharge cells are formed by providing a phosphor that excites the phosphor with vacuum ultraviolet light having a short wavelength emitted by the discharge gas, and red, green, and blue are emitted from the red, green, and blue discharge cells, respectively. Color display is performed by emitting visible light.

  Such a PDP 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 that the display quality is high. Recently, it has attracted particular attention among panel displays, and 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.

In recent years, large panels exceeding 100 inches have been announced. In this case, since it becomes difficult to drive the entire panel with one circuit board, a method of dividing the drive circuit into two or more is conceivable (for example, see Patent Document 1).
JP 2007-156472 A

  Here, when the circuit is divided into two or more, a minute timing difference or voltage difference due to variations in element characteristics for each circuit is inevitable. In Patent Document 1, the output of the drive circuit is electrically connected. However, if the output is connected in this way, there is a risk that a reverse current may flow between the circuits due to timing differences or instantaneous voltage differences, which may lead to circuit destruction.

  The present invention has been made in view of such a problem, and by dividing a circuit for driving a large panel without risk of circuit destruction and solving the uneven brightness of the panel, 100 inches can display a good image. The purpose is to realize a PDP exceeding the above.

  In order to achieve the above object, the plasma display panel of the present invention includes a front substrate on which a plurality of scan electrodes covered with a dielectric and a plurality of sustain electrodes are formed, a back substrate on which write electrodes and barrier ribs are formed, Wherein the plurality of sustain electrodes are divided into at least two groups having the same number, and each of the groups includes a connection portion that electrically connects the sustain electrodes to each other. The connection portions are electrically separated from each other for each group, and are connected to different circuits.

  In order to achieve the above object, the plasma display apparatus of the present invention includes the above-described plasma display panel, a sustain drive circuit for applying a drive voltage to each of the sustain electrodes included in each group, and the sustain electrodes. And a connection substrate for connecting the sustain drive circuit.

  According to the present invention, it is possible to divide a circuit for driving a large panel without risk of circuit destruction and to solve the uneven brightness of the panel, thereby realizing a PDP exceeding 100 inches capable of displaying a good image. be able to.

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings. However, the embodiment of the present invention is not limited to this.

  FIG. 1 is a cross-sectional perspective view schematically showing a configuration of a part of a PDP according to an embodiment of the present invention.

  As shown in FIG. 1, the PDP 1 is configured by disposing a glass front substrate 2 and a rear substrate 3 so as to form a discharge space therebetween.

  On the front substrate 2, a plurality of scanning electrodes 4 and sustaining electrodes 5 constituting display electrodes are formed in parallel with each other. A dielectric layer 6 is formed so as to cover the scan electrode 4 and the sustain electrode 5, and a protective layer 7 is formed on the dielectric layer 6.

  Here, for example, each of the scan electrode 4 and the sustain electrode 5 is composed of metal buses 4A and 5A and transparent electrodes 4B and 5B for increasing conductivity.

  A plurality of data electrodes 11 covered with an insulator layer 10 are provided on the back substrate 3, and for example, stripe-shaped partition walls 8 are provided on the insulator layer 10. A phosphor layer 9 is provided on the surface of the insulator layer 10 and the side surfaces of the partition walls 8.

  The front substrate 2 and the rear substrate 3 are arranged to face each other so that the scan electrodes 4 and the sustain electrodes 5 and the data electrodes 11 intersect, and a discharge gas is sealed in a discharge space formed between them. Yes.

  Note that the structure of the PDP is not limited to the above-described one. For example, even if the partition has a cross-like shape including a vertical partition and a horizontal partition, the effect obtained from the present invention is not affected.

  FIG. 2 is a plan view schematically showing the electrode configuration of the PDP according to one embodiment of the present invention. As described above, a large number of scan electrodes 4 and sustain electrodes 5 are arranged in pairs, and the sustain electrodes 5 are electrically connected by the connecting portion 100 at the end of the screen. With this configuration, there is a role that the connection reliability of the sustain electrodes 5 is increased and luminance variations of the entire PDP are suppressed.

  Further, as shown in FIG. 2, in the PDP according to the embodiment of the present invention, the connecting portion 100 does not connect all the sustain electrodes 5 to one but separates them into two or more groups. Connected. The number of sustain electrodes belonging to each group is equal to Ns. That is, sustain electrodes 5 (Y1, 1) to 5 (Y1, Ns) are connected to connection portion C1 as group 1 and 5 (Y2, 1) to 5 (Y2, Ns) are connected to connection portion C2 as group 2. Yes.

  In each group, a plurality of terminal blocks 220 for connecting to a circuit (not shown) are provided, and the terminal blocks and the circuit are connected by a connection board. Here, the number of terminal blocks for each group is equal and is Nb. That is, the connection block C1 includes terminal blocks 220 (B1, 1) to 220 (B1, Nb), and the connection block C2 includes terminal blocks 220 (B2, 1) to 220 (B2, Nb). ing.

  Different groups are connected to different circuits, and each group is electrically separated including the connection portion 100 and the circuit.

  FIG. 3 is a perspective view showing a schematic configuration of the plasma display apparatus according to the embodiment of the present invention, which uses the above-described PDP according to the embodiment of the present invention. 3A is a view as seen from the PDP 1 side, and FIG. 3B is a view as seen from the chassis 20 side on the opposite side. The PDP 1 is affixed to the chassis 20, and the drive circuit groups 31 to 35 are fixed to the surface opposite to the surface to which the PDP 1 is affixed.

  In the PDP 1, each electrode is connected to each drive circuit through a terminal block. The scanning electrode 4 (FIG. 1) is connected to the connection substrate 21 in the terminal block 210, and this connection substrate 21 is connected to the scanning drive circuit 31. Sustain electrode 5 (FIG. 1) is connected to connection substrate 22 in terminal block 220, and this connection substrate 22 is connected to sustain drive circuit 32. The data electrode 11 (FIG. 1) is connected to the connection substrate 23 in the terminal block 230, and the connection substrate 23 is connected to the data driving circuit 33.

  A power supply circuit 34 and a control circuit 35 are connected to the scan drive circuit 31, the sustain drive circuit 32, and the data drive circuit 33, respectively. These circuits may be shared or divided. In the PDP according to the embodiment of the present invention, a plurality of sustain drive circuits 32 are provided corresponding to the group of sustain electrodes 5 already described. Here, an example in which the number of groups is two is shown.

  As the connection substrates 21, 22, and 23, a flexible substrate (FPC) is usually used.

  As described above, when the sustain drive circuit 32 is divided into two or more groups, there is a problem that a minute voltage or timing change generated between the circuits occurs. If all the sustain electrodes 5 to be connected are shared, the potential difference is instantaneously generated in the shared portion, and the electrodes may generate heat due to the instantaneous current. In order to avoid this, when the outputs of the plurality of sustain drive circuits 32 are connected, this minute timing difference or voltage difference becomes a reverse current between the outputs of the circuit, leading to circuit destruction. Therefore, at least these groups need to be electrically separated. However, if they are simply separated, the brightness unevenness occurs in the panel due to this minute timing difference and voltage difference.

  In order to suppress such luminance unevenness, it is effective to suppress the variation in the applied voltage as a result, or to make it comparable to each group even if there is a slight difference in timing. For this purpose, it is preferable to make the groups equivalent by aligning the physical arrangement leading to the drive circuit and the electrodes of each group.

  Here, as shown in FIG. 2, in the PDP according to the embodiment of the present invention, not all the sustain electrodes 5 are connected to one, but divided into two or more groups and connected. In addition, the number of sustain electrodes belonging to each group is made equal. Furthermore, in each group, the number of terminal blocks 220 provided for connection to the circuit is also the same for each group. Also in the configuration of the plasma display device according to the embodiment of the present invention shown in FIG. 3, the number of terminal blocks 220 is the same for each block, showing a configuration in which each is four. Similarly, the number of connection boards 22 is also the same in each group, and a configuration in which four connection boards 22 are provided is shown.

  With the configuration as described above, it is difficult to cause variations between groups.

  Furthermore, it is preferable that the area and the width (W in FIG. 2) of the connecting portion 100 in each group are equal. In each group, the arrangement of the terminal block 220 is not necessarily symmetrical, but it is preferable that the relationship between the groups is symmetrical. That is, it is important to make the state at the boundary between the groups equal between the groups.

  Furthermore, it is preferable not to generate a voltage difference between the electrodes in each group. For this reason, in each group, it is preferable to arrange a plurality of terminal blocks equally and supply the voltage from the drive circuit to each electrode evenly.

  For this reason, it is preferable that the area of the connecting portion 100 be sufficiently large so that a current can be evenly supplied to each electrode.

  FIG. 4 is an explanatory diagram for the area (width) necessary for the connection portion 100. Let Ns be the number of sustain electrodes 5 belonging to one group. The number of terminal blocks 220 is Nb. Then, the number of sustain electrodes per terminal block is Ns / Nb. In the drawing, the range delimited by the horizontal broken line is the sustain electrode 5 that one terminal block 220 takes charge of. The current supplied from one terminal block 220 is distributed and flows to each electrode, but the current flowing from the terminal block 220 through the connecting portion 100 is the maximum number of sustain electrodes Ns per terminal block. It is half of / Nb, that is, Ns / (2 · Nb). Therefore, the width of the connection portion needs to be larger than Ns / (Nb · 2) times the sustain electrode width We. From this, the relational expression Ws ≧ We × Ns / (2 · Nb) is derived with respect to the width Ws of the connecting portion.

  5 shows the connection portion 100 and the sustain electrode 5 in a plan view, and the scan electrode 4 and the sustain electrode 5 are angled as shown in FIG. Withdrawn. In this case, the connection part 100 is arrange | positioned so that the drawer | drawing-out part may be shared. However, as shown in FIG. 5B, in the connection part 100 in the PDP according to the embodiment of the present invention, the sustain electrodes 5 are all connected to the connection part 100 with the same length and the same angle. By doing so, a difference in length for each electrode does not occur in the sustain electrode 5 portion, and variation within the group is suppressed, which is preferable.

  Next, the circuit configuration of the plasma display device according to the embodiment of the present invention will be described with reference to FIG. 3 again.

  As described above, in the plasma display panel according to the embodiment of the present invention, two or more sustain drive circuits 32 are provided corresponding to the group of sustain electrodes 5. Here, the number of connection boards 22 belonging to the two groups is made equal, and the arrangement is made symmetrical. This is preferable because the routes of currents supplied to the two groups are made equal, and the difference in luminance generated between the two groups can be suppressed. Note that the number of connection boards and connection portions is not necessarily the same. It is conceivable to design a plasma display device in which the arrangement of the connection substrate is changed from the purpose and design concept of the circuit and the entire device while using the same panel, in which case the connection substrate is not connected to some connection parts. It is also possible. In this case, the number of connection substrates is smaller than the number of connection portions.

  Furthermore, it is possible to separately provide a power supply substrate for supplying a voltage to each of the two sustain drive circuits. By doing so, it is possible to completely separate the two sustain drive circuits including their power supply paths and to perform a stable operation. In addition, since the distance between the power supply substrate and the sustain drive circuit can be reduced as compared with the case where the power is supplied from one power supply, more stable voltage supply is possible.

  The present invention is not based on the structure of the PDP shown in FIG. 1, and the dielectric layer 6, the partition wall 8, the scan electrode 4, the sustain electrode 5, etc. may not be described in the above embodiment. It is also clear that the effect of the present invention does not depend on the PDP driving method.

  As described above, the present invention is useful for providing a PDP and a PDP device used for a large display.

1 is a cross-sectional perspective view schematically showing a configuration of a part of a PDP according to an embodiment of the present invention. The top view which shows typically the electrode structure of PDP by one embodiment of this invention The perspective view which shows schematic structure of the plasma display apparatus by one embodiment of this invention. The figure explaining the design guideline of the connection part in PDP by one embodiment of this invention The figure which shows the relationship between the connection part and electrode in PDP by one embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plasma display panel 2 Front substrate 3 Back substrate 4 Scan electrode 5 Sustain electrode 6 Dielectric layer 7 Protective layer 8 Partition 9 Phosphor layer 10 Insulator layer 11 Data electrode 12 Black stripe 20 Chassis 21 Scan electrode connection substrate 22 Sustain electrode connection Substrate 23 Data electrode connection substrate 31 Scan drive circuit 32 Sustain drive circuit 33 Data drive circuit 34 Power supply circuit 35 Control circuit 100 Sustain electrode connection part 210 Scan electrode terminal block 220 Sustain electrode terminal block 230 Data electrode terminal block

Claims (13)

A plasma display panel in which a front substrate on which a plurality of scan electrodes covered with a dielectric and a plurality of sustain electrodes are formed, and a rear substrate on which write electrodes and barrier ribs are formed are arranged to face each other,
The plurality of sustain electrodes are divided into at least two equal groups.
A connection portion for electrically connecting the sustain electrodes to each group,
The connecting portions are electrically separated from each other for each group, and are connected to different circuits.
A plasma display panel characterized by that. The plasma display panel according to claim 1, wherein the connecting portions have the same area. The plasma display panel according to claim 1, wherein the connecting portions have the same width. The plasma display panel according to claim 1, wherein the sustain electrodes have the same length. 5. The plasma display panel according to claim 4, wherein each of the sustain electrodes is connected to the connection part at an equal angle. The plasma display panel according to claim 1, wherein the connection part contains silver. Two or more terminal blocks for connecting a connection substrate for connecting the connection portion included in each group and a sustain drive circuit for applying a drive voltage to the sustain electrode are provided for each group. The plasma display panel according to claim 1. The plasma display panel according to claim 7, wherein the number of the terminal blocks included in each group is the same in all groups. The plasma display panel according to claim 8, wherein an arrangement of the terminal blocks included in each group is symmetrical. When the number of the terminal blocks included in each group is Nb, the number of the sustain electrodes included in each group is Ns, the electrode width is We, and the width of the connecting portion included in each group is Ws, Ws ≧ The plasma display panel according to claim 7, wherein a relationship of We × Ns / (2 · Nb) is satisfied. The plasma display panel according to claim 1, a sustain drive circuit for applying a drive voltage to each of the sustain electrodes included in each group, and the sustain electrode and the sustain drive circuit are connected to each other. A plasma display device. The plasma display apparatus according to claim 11, wherein the output of the sustain drive circuit is electrically separated for each group. The plasma display apparatus as claimed in claim 12, wherein a power supply for supplying a voltage to the sustain drive circuit is provided separately for each sustain drive circuit.

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