JP4333097B2 - Plasma display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display device known as a thin, lightweight display device having a large screen.
[0002]
[Prior art]
In this plasma display device, an ultraviolet ray is generated by gas discharge, and a phosphor is excited by the ultraviolet ray to emit light to perform color display. And the display cell divided by the partition on the board | substrate is provided, and it has the structure by which the fluorescent substance layer is formed in this.
[0003]
This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types: a surface discharge type and a counter discharge type, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, the mainstream of plasma display devices is a surface discharge type of a three-electrode structure, and the structure has a pair of display electrodes adjacent in parallel on one substrate, and on the other substrate. It has an address electrode arranged in a direction intersecting with the display electrode, a partition wall, and a phosphor layer. The phosphor layer can be made relatively thick and is suitable for color display using a phosphor.
[0004]
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.
[0005]
Hereinafter, the plasma display device will be described with reference to FIGS. First, the structure of the plasma display panel in the plasma display device will be described with reference to FIG. As shown in FIG. 3, a plurality of stripe-shaped display electrodes 2 paired with a scan electrode and a sustain electrode are formed on a transparent front side substrate 1 such as a glass substrate, and covers the electrode group. Thus, the dielectric layer 3 is formed, and the protective film 4 is formed on the dielectric layer 3.
[0006]
Further, a plurality of rows of stripes covered with an overcoat layer 6 are formed on the rear substrate 5 opposite to the front substrate 1 so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. Address electrodes 7 are formed. On the overcoat layer 6 between the address electrodes 7, a plurality of barrier ribs 8 are arranged in parallel with the address electrodes 7, and a phosphor layer 9 is provided on the side surface between the barrier ribs 8 and on the surface of the overcoat layer 6. Yes.
[0007]
The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrode 2 and the address electrode 7 of the scan electrode and the sustain electrode are almost orthogonal to each other, and the periphery is sealed, In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. Further, the discharge space is divided into a plurality of sections by partition walls 8 to provide a plurality of discharge cells where the intersections of the display electrodes 2 and the address electrodes 7 are located, and each of the discharge cells has red, green and blue colors. The phosphor layers 9 are sequentially arranged one by one so that
[0008]
FIG. 4 shows an electrode arrangement of the plasma display panel. As shown in FIG. 4, the scan electrode, the sustain electrode, and the address electrode have a matrix configuration of M rows × N columns, and M rows are arranged in the row direction. Scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged, and N columns of address electrodes D1 to DN are arranged in the column direction.
[0009]
In the plasma display panel having such an electrode configuration, an address pulse is applied between the address electrode and the scan electrode by applying a write pulse between the address electrode and the scan electrode, and after selecting the discharge cell, the scan electrode By applying a periodic sustain pulse that is alternately inverted between the sustain electrode and the sustain electrode, a sustain discharge is performed between the scan electrode and the sustain electrode, and a predetermined display is performed.
[0010]
FIG. 5 is an exploded perspective view showing an example of the overall configuration of a plasma display device incorporating the panel having the structure described above. In the figure, the panel 10 is held by adhering to the front surface of a chassis member 11 made of aluminum or the like via a heat conductive sheet 12, and a plurality of panels 10 for driving the panel 10 are displayed on the back side of the chassis member 11. The circuit block 13 is attached to form a display unit. The heat conductive sheet 12 is for efficiently transferring the heat generated in the panel 10 to the chassis member 11 to radiate heat. In addition, the circuit block includes an electric circuit for driving and controlling the display of the panel 10, and straddles the outer edge of the four sides of the chassis member 11 over the electrode lead-out portion that is drawn to the edge of the panel 10. They are electrically connected by a plurality of flexible wiring boards (not shown) that extend beyond them.
[0011]
The housing for housing the display unit is disposed on the front side of the panel 10 of the display unit, the back cover 14 disposed so as to cover the back side where the circuit block 13 of the display unit is disposed, and the panel 10 A front glass 15 having a window 15a corresponding to the display area and covering a peripheral part other than the display area, and the window 15a of the front frame 15 also serves as a protection for the optical filter and the panel 10. 16 is arranged. The front glass 16 is provided with a transparent conductive film in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 14 is provided with a plurality of vent holes 14a for releasing heat generated in the panel 10 and the like to the outside.
[0012]
In the plasma display device having such a configuration, a structure described in Japanese Patent Application Laid-Open No. 11-186780 is known as a structure for reducing the noise terminal voltage.
[0013]
6 (a), 6 (b), and 6 (c) show an example of a noise terminal voltage reduction structure in a conventional plasma display device. In FIG. The shielded power cord 22 is passed through the conduction hole 21b, and the connector 23 provided at the tip of the power cord 22 is inserted into the inlet 25 attached to the substrate 24 of the power supply block of the plasma display device to supply power to the substrate 24. It is structured to supply. The inlet 25 is fixed to the substrate 24 by a mounting bracket 26 with screws 27 or the like.
[0014]
[Problems to be solved by the invention]
However, in such a structure, since the unshielded connector 23 is housed in the housing 21, it is possible to prevent noise from being superimposed on the connector 23, but the power cord is not connected. Since the connector 23 of the cord 22 is inside the casing of the plasma display device, there is a problem that the power cord 22 cannot be easily attached and detached.
[0015]
The present invention solves such a conventional problem, and an object thereof is to easily attach and detach a power cord and reduce noise superimposed on the power cord and the connector.
[0016]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, an input block includes a metal casing attached to the chassis member, and a substrate of the input block attached to the metal casing and supplying a commercial power supply voltage to the power supply block. And a power terminal connected to the metal housing and an earth terminal connected to the metal casing , and the power cord has a plug portion connected to a power outlet at one end and the inlet at the other end. The power supply cord has a connector part to be connected and has a structure in which the cord part between the plug part and the connector part is shielded, and the plug part has an across-the-line capacitor. And the noise superimposed on a connector part is reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
That is, according to the first aspect of the present invention, there is provided a display unit in which a circuit block for applying a signal to the panel for display is attached to the back side of a metal chassis member holding the panel, and the display unit. A power supply block for supplying power to the power supply block, and an input block to which a power supply cord for supplying a commercial power supply voltage to the power supply block is mounted. The input block includes a metal housing attached to the chassis member, and A power supply terminal attached to a metal housing and connected to a substrate of the input block so as to supply a commercial power supply voltage to the power supply block, and an inlet having a ground terminal connected to the metal housing; and The power cord has a plug portion connected to a power outlet at one end and a connector portion connected to the inlet at the other end. And a code part to shield the structure between the plug portion and a connector portion, further the plug part which comprising the across-the-line capacitors.
[0019]
Hereinafter, a plasma display apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2, the same parts as those shown in FIGS. 3 to 6 are denoted by the same reference numerals.
[0020]
FIG. 1 shows a main configuration of a plasma display device according to an embodiment of the present invention. FIG. 2 is a plan view showing an arrangement structure of a display unit with the back cover removed in the plasma display device. The overall configuration of the plasma display device will be described with reference to FIG.
[0021]
In FIG. 2, a scan driver circuit block 30 supplies a predetermined signal voltage to the scan electrodes of the panel 10, a sustain driver circuit block 31 supplies a predetermined signal voltage to the sustain electrodes of the panel 10, and an address driver circuit block 32 A predetermined signal voltage is supplied to the address electrodes of the panel 10, and the scan driver circuit block 30 and the sustain driver circuit block 31 are arranged at both ends in the width direction of the chassis member 11, and the address driver circuit block 32 is a chassis. It arrange | positions at the upper end part of the height direction of the member 11, and a lower end part.
[0022]
The control circuit block 33 displays image data on the basis of a video signal sent from an input signal circuit block 34 having an input terminal portion to which a connection cable for connecting to an external device such as a television tuner is detachably connected. An image data signal corresponding to the number of pixels of 10 is converted and supplied to the address driver circuit block 32, and a discharge control timing signal is generated and supplied to the scan driver circuit block 30 and the sustain driver circuit block 31, respectively. It performs display drive control such as control, and is disposed at substantially the center of the chassis member 11.
[0023]
The power supply block 35 supplies a voltage to each of the circuit blocks. Like the control circuit block 33, the power supply block 35 is arranged at substantially the center of the chassis member 11 and is attached with a power supply cord (not shown). The commercial power supply voltage is supplied through the input block 36.
[0024]
The flexible wiring board 37 connects the scanning electrode of the panel 10, the electrode lead-out portion of the sustain electrode, and the printed wiring board of the scan driver circuit block 30 and the sustain driver circuit block 31, and the flexible wiring board 38 is an address electrode of the panel 10. The electrode lead-out portion and the printed wiring board of the address driver circuit block 32 are connected to each other. The electrode lead-out portion and the printed wiring board of the address driver circuit block 32 are arranged by being bent 180 degrees from the front side to the back side through the outer peripheral portion of the panel 10.
[0025]
Although not shown, each circuit block has a ground terminal connected to a metal chassis member 11.
[0026]
Next, the main structure of the plasma display device according to the present invention will be described with reference to FIG. 1. As shown in FIG. 1, a metal housing 39 attached to the chassis member 11 in the input block 36 of the power supply block 35. Inlet 40 is attached. The power terminal 40 a of the inlet 40 is connected to the substrate 41 of the input block 36, and the ground terminal 40 b is connected to the metal housing 39. Reference numeral 42 denotes wiring for connecting each terminal of the inlet 40 to the substrate 41 and the metal casing 39.
[0027]
The power cord 43 has a plug portion 44 connected to a power outlet at one end and a connector portion 45 connected to the inlet 40 at the other end, and the cord portion 46 between the plug portion 44 and the connector portion 45 is shielded. The plug portion 44 includes an across-the-line capacitor 47. Further, the plug portion 44 and the connector portion 45 have a structure having ground terminals 44a and 45a, respectively.
[0028]
That is, in the present invention, an across-the-line capacitor 47 is provided in the plug portion 44 of the power cord 43 for connecting the power block 35 and a commercial power outlet. Even if the noise generated inside the plasma display device passes through the shield of the metal casing 39 and is superimposed from the unshielded connector portion 45, the across-the-chip built in the plug portion 44 is used. It can be absorbed and reduced by the line capacitor 47. Moreover, unlike the prior art, it is not necessary to arrange the connector portion 45 in the metal casing 39, so that the power cord 43 can be easily attached and detached.
[0029]
【The invention's effect】
As described above, according to the plasma display device of the present invention, a display unit in which a circuit block for displaying a signal by applying a signal to the panel is attached to the back side of a metal chassis member holding the panel; A power supply block for supplying power to the display unit; and an input block to which a power cord for supplying a commercial power supply voltage is attached to the power supply block. The input block is a metal casing attached to the chassis member. And an inlet having a power terminal connected to the substrate of the input block and a ground terminal connected to the metal casing so as to supply a commercial power supply voltage to the power supply block. The power cord has a plug portion connected to a power outlet at one end and is connected to the inlet at the other end. And having a structure in which the cord portion between the plug portion and the connector portion is shielded, and the plug portion is provided with an across-the-line capacitor, whereby the power cord and the connector portion are provided. It is possible to reduce the superimposed noise, and it is possible to easily attach and detach the power cord while realizing a reduction in the noise terminal voltage.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a main part of a plasma display device according to an embodiment of the present invention. FIG. 2 is a plan view showing a main part structure of the plasma display device. FIG. 4 is an electrical wiring diagram showing the electrode arrangement of the plasma display device. FIG. 5 is an exploded perspective view showing the overall configuration of the plasma display device. FIG. 6 is a schematic configuration showing the main part of a conventional plasma display device. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Panel 11 Chassis member 13 Circuit block 35 Power supply block 36 Input block 40 Inlet 43 Power supply cord 44 Plug part 45 Connector part 46 Code part 47 Across the line capacitor

Claims (1)

A display unit in which a circuit block that applies a signal to the panel to display is attached to the back side of a metal chassis member that holds the panel, a power supply block that supplies power to the display unit, and a power supply block And an input block to which a power cord for supplying a commercial power supply voltage is attached. The input block includes a metal casing attached to the chassis member, and a commercial power source attached to the metal casing and connected to the power supply block. A power supply terminal connected to the substrate of the input block to supply a voltage and an inlet having a ground terminal connected to the metal casing , and the power cord has a plug connected to a power outlet at one end And a connector portion connected to the inlet at the other end, and a connector between the plug portion and the connector portion. A plasma display apparatus and to shield the de part structure, the more the plug part, characterized by comprising the across-the-line capacitors.

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