JP2006039073A - Plasma display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of interference electromagnetic wave in a plasma display apparatus. <P>SOLUTION: The display apparatus comprises; a display unit in which a panel is arranged in front of a metal chassis member 11 and a circuit block which performs displaying by applying a signal to the panel at the back and in which a ground terminal of the circuit block is connected to the chassis member 11; at least two support posts 32, one end being fixed to the chassis member 11 of the display unit; a basis 33 to which the other end of the support post is fixed; and a stand 31 for supporting the display unit in a standing state. The support post 32 of the stand 31 is made of metal and at least a part where the metal support post 32 is fixed on the basis 33 is coated by a resin coating film 32a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plasma display device known as a thin, lightweight display device having a large screen.

  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.

  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.

  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.

  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.

  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.

  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

  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.

  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.

  FIG. 5 is an exploded perspective view showing an example of the entire configuration of the 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 dissipate heat. Further, the circuit block 13 includes an electric circuit for performing display driving of the panel 10 and its control, and the electrode lead-out portion led out to the edge portion of the panel 10 extends over the outer edge portions of the four sides of the chassis member 11. They are electrically connected by a plurality of flexible wiring boards (not shown) extending beyond.

  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.

  In the plasma display device having such a configuration, a stand for supporting the display unit in an upright state is used. As the structure of this stand, one described in Patent Document 1 is known.

FIG. 6 shows the structure of a stand in a conventional plasma display apparatus. As shown in FIG. 6, the conventional stand 17 is made of a metal rod-like column 18 and a metal plate-like column for fixing the column 18. The chassis member 11, which is constituted by the pedestal 19 and to which the circuit block 13 of the display unit is attached and to which the ground terminal of the circuit block 13 is connected, is fixed to the metal column 18 of the stand 17, thereby plasma display It is structured to support the device in an upright state.
Japanese Patent Laid-Open No. 11-143372

  By the way, in this type of plasma display device, as described above, the display unit selectively discharges the discharge cell by applying a pulse signal to the electrode of the panel, so that the display unit emits unnecessary electromagnetic waves. Therefore, various countermeasures against this unwanted radiation have been taken.

  However, in the above-described conventional configuration, by attaching the stand 17 to the chassis member 11, the ground terminal of the circuit block 13 of the display unit is the chassis member 11-one column 18 of the stand 17 serving as an antenna, and a metal column, In addition, there is a problem in that disturbing electromagnetic waves are generated due to current flowing through the surface layer of the pedestal.

  The present invention solves such a conventional problem, and an object thereof is to suppress the generation of disturbing electromagnetic waves.

  In order to achieve the above object, according to the present invention, a panel is arranged on the front side of a metal chassis member, and a circuit block for displaying a signal by applying a signal to the panel is arranged on the rear side, and the ground of the circuit block is arranged. A display unit having a terminal connected to a chassis member, at least two support columns having one end fixed to the chassis member of the display unit, and a pedestal fixing the other end of the support column, the display unit is supported in an upright state. The stand column is made of metal, and at least a portion of the metal column fixed to the pedestal is covered with an electrically insulating material.

  According to the plasma display device of the present invention, the electromagnetic interference generated from the conventional stand can be reduced by covering at least the portion of the stand's metal column fixed to the pedestal with the electrically insulating material. .

  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.

  FIG. 1 shows a schematic front view of a plasma display device according to an embodiment of the present invention attached to a stand, and FIG. 2 shows an internal display unit with the back cover removed in the plasma display device. The arrangement structure is shown.

  2, the scan driver circuit block 20 supplies a predetermined signal voltage to the scan electrodes of the panel 10, the sustain driver circuit block 21 supplies a predetermined signal voltage to the sustain electrodes of the panel 10, and the address driver circuit block 22 A predetermined signal voltage is supplied to the address electrodes of the panel 10, and the scan driver circuit block 20 and the sustain driver circuit block 21 are arranged at both ends in the width direction of the chassis member 11, and the address driver circuit block 22 is a chassis. It arrange | positions at the upper end part of the height direction of the member 11, and a lower end part.

  The control circuit block 23 displays image data on the basis of a video signal sent from an input signal circuit block 24 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 22, and a discharge control timing signal is generated and supplied to the scan driver circuit block 20 and the sustain driver circuit block 21, respectively. It performs display drive control such as control, and is disposed at substantially the center of the chassis member 11.

  The power supply block 25 supplies a voltage to each of the circuit blocks. Like the control circuit block 23, the power supply block 25 is disposed at a substantially central portion of the chassis member 11 and includes a connector 26 to which a power cable (not shown) is attached. The commercial power supply voltage is supplied through the power input block 27 having the power supply.

  The flexible wiring board 28 connects the scanning electrode of the panel 10 and the electrode lead-out portion of the sustain electrode to the printed wiring board of the scan driver circuit block 20 and the sustain driver circuit block 21, and the flexible wiring board 29 is an address electrode of the panel 10. The electrode lead-out portion and the printed wiring board of the address driver circuit block 22 are connected to each other. The electrode lead-out portion and the printed wiring board of the address driver circuit block 22 are arranged by being bent 180 degrees from the front side to the back side through the outer periphery of the panel 10.

  Although not shown, each circuit block has a ground terminal connected to a metal chassis member 11.

  Further, in FIG. 2, the bracket 30 is provided with two metal rod-like columns 32 of a stand 31 as shown in FIG. 1, and is positioned at the lower end of the chassis member 11 in the height direction. Installed. One end of each column 32 of the stationary stand 31 is inserted into the hole of the bracket 30, and the column 31 is fixed to the bracket 30 with a screw or the like, so that the stand 31 is attached, thereby supporting the display unit in a standing state. Will be.

  Further, as shown in FIG. 1, the column 32 of the stand 31 is entirely covered with a resin coating film 32 a as an electrical insulator, so that the plate-like pedestal 33 is electrically insulated. It is fixed. In addition, in this Embodiment, although the example in case the support | pillar 32 of the stand 31 is two is shown, you may provide two or more support | pillars 32. FIG. Further, the resin coating film 32a is provided so as to cover the entire support column 32, but may be provided so as to cover at least a portion fixed to the pedestal 33.

  That is, the present invention includes a stand 31 including at least two columns 32 having one end fixed to the chassis member 11 of the display unit and a pedestal 33 that fixes the other end of the column 32. Is made of metal, and at least a portion of the metal support 32 fixed to the pedestal 33 is covered with a resin coating film 32a, which is an electrically insulating material. The support 32 of the stand 31 is electrically connected to the pedestal 33. Since the closed loop is not formed between the ground terminal of the circuit block of the display unit, the chassis member 11, the support column 32 of the stand 31, and the pedestal 33, the conventional closed loop is problematic. It is possible to suppress the generation of the disturbing electromagnetic wave. Furthermore, the generation of disturbing electromagnetic waves, which has been a problem due to current flowing through the metal struts 32 and the surface layer of the pedestal 33, can be suppressed.

  As described above, according to the present invention, it is a useful invention that can provide a plasma display device capable of reducing interference electromagnetic waves.

1 is a schematic front view showing a plasma display device according to an embodiment of the present invention. The top view which shows the principal part structure of the plasma display apparatus The perspective view which shows the panel structure of a plasma display apparatus Electrical wiring diagram showing electrode arrangement of plasma display device Exploded perspective view showing the entire configuration of the plasma display device Schematic configuration diagram showing a conventional plasma display device

Explanation of symbols

10 Panel 11 Chassis member 13 Circuit block 31 Stand 32 Support column 32a Resin coating film 33 Base

Claims (1)

A display unit in which a panel is disposed on the front side of a metal chassis member and a circuit block that performs display by applying a signal to the panel is disposed on the rear side, and a ground terminal of the circuit block is connected to the chassis member; A stand for supporting the display unit in an upright state, comprising at least two columns whose one end is fixed to the chassis member of the display unit and a pedestal for fixing the other end of the column; A plasma display device characterized in that it is made of metal, and at least a portion fixed to the pedestal of the metal column is covered with an electrically insulating material.

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