JP4277487B2 - 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 stand for supporting the display unit in an upright state is used. As the structure of this stand, the one described in JP-A-11-143372 is known. ing.
[0013]
FIG. 6 shows the structure of a stand in a conventional plasma display apparatus. As shown in FIG. 6, the conventional stand 17 is composed of a metal rod-like column 18 and a metal plate-like base for fixing the column 18. The chassis member 11 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 the plasma display device. It has a structure that supports in a standing state.
[0014]
[Problems to be solved by the invention]
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.
[0015]
However, in the conventional configuration described above, by attaching the stand 17 to the chassis member 11, the ground terminal of the circuit block 13 of the display unit is connected to the chassis member 11-one column 18 of the stand 17-pedestal 19-the other column 18-. There is a problem that a closed loop is formed in the path of the chassis member 11 and a disturbing electromagnetic wave is generated when a current flows in the loop.
[0016]
The present invention solves such a conventional problem, and an object thereof is to suppress the generation of disturbing electromagnetic waves.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a bracket attached to the position of the lower end portion of the chassis member of the display unit in the height direction, and is electrically connected to the chassis member by fixing one end to the bracket. A stand made of at least two metal posts and a pedestal for fixing the other end of the support drawn to the outside of the housing, and supporting the display unit in an upright state , The metal columns are fixed to the pedestal while being electrically insulated from each other.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
That is, according to the first aspect of the present invention, a panel is arranged on the front side of a metal chassis member, and a circuit block for displaying by applying a signal to the panel is arranged on the rear side, and the circuit block. A display unit having a ground terminal connected to the chassis member, a back cover disposed so as to cover a back side where the circuit block of the display unit is disposed, and a front frame disposed on the front side of the panel of the display unit, And a bracket attached to the position of the lower end of the display unit in the height direction of the chassis member. One end of the bracket is fixed to the chassis member so as to be electrically connected to the chassis member. consists pedestal for fixing the other end is drawn out of the housing of the struts and the supports consist of at least two metal and said display Yoo And a stand for supporting in a state of upright Tsu bets, in the stand and is characterized in that fixed to the base of the metallic post in a state of electrically insulated from each other.
[0020]
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.
[0021]
FIG. 1 shows a main configuration of a plasma display device according to an embodiment of the present invention, and FIG. 2 is a plan view showing the arrangement structure of a display unit with the back cover removed in the plasma display device. 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. 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 connected to the chassis member 11. Upper and lower end in the height direction It is located.
[0022]
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.
[0023]
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.
[0024]
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 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]
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. It is attached. One end of each column 32 of the stationary stand 31 is inserted into the hole of the bracket 30, and the column 32 is fixed to the bracket 30 with a screw or the like so that the column 32 is electrically connected to the chassis member 11. A stand 31 is attached, and thus the display unit is supported in a standing state. Further, the other end of the column 32 of the stand 31 is pulled out to the outside of the casing constituted by the back cover and the front frame, and is electrically insulated by being embedded in a plate-like pedestal 33 made of an electrical insulator. It is fixed in the state. In the present embodiment, an example in which there are two support columns 32 of the stand 31 is shown, but two or more support columns 32 may be provided.
[0027]
In other words, in the present invention, at least two of the display members that are electrically connected to the chassis member 11 by fixing one end to the bracket 30 attached to the position of the lower end portion in the height direction of the chassis member 11 of the display unit . A stand 31 comprising a metal support 32 and a pedestal 33 for fixing the other end of the support 32 drawn out of the housing is provided. In the stand 31, the metal support 32 is electrically insulated from each other. In this state, the base 31 of the stand 31 is electrically insulated by the base 33 so that the ground terminal of the circuit block of the display unit, the chassis member 11, the post 32 of the stand 31, and the base 33 are fixed. Since no closed loop is formed between the It is possible to suppress the raw.
[0028]
【The invention's effect】
As described above, according to the plasma display device of the present invention, the stand column is made of metal, and the metal column is fixed to the pedestal while being electrically insulated from each other. The interference electromagnetic wave which has been reduced can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a plasma display device according to an embodiment of the present invention. FIG. 2 is a plan view showing a main structure of the plasma display device. FIG. 3 is a perspective view showing a panel structure of the plasma display device. FIG. 4 is an electrical wiring diagram showing an 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 diagram showing a conventional plasma display device.
10 Panel 11 Chassis member 13 Circuit block 31 Stand 32 Post 33 Pedestal

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 housing composed of a back cover arranged to cover the back side where the circuit block of the display unit is arranged, and a front frame arranged on the front side of the panel of the display unit, and a chassis of the display unit A bracket attached to the position of the lower end portion in the height direction of the member, and at least two metal columns electrically connected to the chassis member by fixing one end to the bracket, and the column of the column and a stand for supporting a state in which it and erected the display unit from the base for fixing the other end drawn to the outside of the housing For example, a plasma display device, characterized in that in the stand, fixed to the base of the metallic post in a state of electrically insulated from each other.

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