JP4309706B2 - Flat panel display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat display device.
[0002]
[Prior art]
In recent years, as display panels used in flat display devices, row electrode pairs and column electrode pairs are respectively arranged on the inner surfaces of a pair of substrates opposed to each other via a discharge space, and at the intersection of these two electrodes. Development of plasma display panels (hereinafter referred to as PDPs) in which discharge cells are configured and display is performed by causing discharge in each discharge cell has been activated.
[0003]
Such a flat display device using a PDP is used for a large-screen image monitor or the like, and is a tuner that provides an image source, a speaker that outputs sound, an audio circuit that controls the audio signal and drives the speaker. Etc. each used a separate device.
[0004]
However, along with the widespread use of large-screen flat display devices in general households, flat display devices in which a tuner, a speaker, an audio circuit, and the like are integrated have been developed so that they can be easily used as home television receivers.
[0005]
An integrated flat display device as described above includes a panel drive unit that controls drawing of a display panel, a speaker, and an audio circuit that drives the speaker by controlling an audio signal in an exterior housing that houses the display panel. And a tuner circuit for extracting an audio signal and an image signal to be reproduced.
[0006]
Hereinafter, an example of a conventional integrated flat display device will be described in detail with reference to FIGS. 1 and 2.
FIG. 1 is a back view of a conventional flat display device with a rear cover removed, and FIG. 2 is a cross-sectional view taken along the line AA with the rear cover attached to the conventional flat display device shown in FIG. FIG. 3 is a perspective view showing an example of the structure of the source part.
[0007]
As shown in FIGS. 1 and 2, the flat display device 101 is input to the back surface of a metal chassis substrate 104 to which a PDP 103 that is a flat display panel for displaying an image is attached on the front surface. A panel driving unit 105 that controls drawing of the PDP 103 based on an image signal, an audio circuit that controls an output signal to a speaker or the like based on an input audio signal, and a panel that selects a received radio wave such as a TV radio wave A source unit 108 including a tuner circuit that extracts an image signal input to the drive unit 105 and an audio signal input to the audio circuit, and a power supply unit 102 that supplies power to the circuits of the above-described units are provided. In this structure, the rear surface of the chassis substrate 104 equipped with each of the above parts is covered with a metal rear cover 111. The rear cover 111 also serves as a cover for covering an open portion of the rear surface of the front frame 112 that houses the PDP 103, and constitutes an exterior casing 113 that forms the appearance of the apparatus together with the front frame 112.
[0008]
The PDP 103 is fixed to the front surface of the chassis substrate 104 with a double-sided adhesive tape. A transparent front protective plate 114 that covers the front side of the PDP 103 is attached to the opening of the front frame 112. The chassis substrate 104 is fastened and fixed to the front frame 112 by screws or the like.
[0009]
The front frame 112 is usually an integrally molded product made of synthetic resin. The rear cover 111 is an integrated product that covers the entire rear surface of the chassis substrate 104 on which the panel driving unit 105 and the source unit 108 are mounted, and is made of metal because it prevents electromagnetic wave leakage (for example, Patent Document 1).
[0010]
Further, as shown in FIG. 3, the source unit 108 is housed in a shield case 121, in particular, a portion of the circuit provided on the substrate 115 that requires an electromagnetic shield. A heat generating component 118 such as a power IC of the audio circuit is attached to the heat sink 120.
[0011]
[Patent Document 1]
JP 2002-341777 A
[Problems to be solved by the invention]
By the way, in the conventional flat display device 101, the source unit 108 exists in the accommodation space of the panel drive unit 105 and the power supply unit 102, and is generated by the operation of the panel drive unit 105 and the power supply unit 102, the discharge of the PDP 103, and the like. For example, a member that shields electromagnetic waves, such as a shield case 121 for accommodating a portion that requires an electromagnetic shield shown in FIG. 3, is necessary because the electromagnetic noise to be affected affects the image signal and the audio signal in the source unit 108. There was a problem of increasing the cost.
[0013]
Further, the heat generating component 118 having a relatively large power consumption such as a power IC mounted on the audio circuit of the source unit 108 generates a considerable amount of heat. As described above, in the structure in which the heat generating component 118 is built in the housing space of the panel drive unit 105 or the power supply unit 102, the heat generated from the heat generating component 118 is trapped in the housing space and causes an excessive temperature rise. .
[0014]
In order to prevent the deterioration of the display characteristics of the panel and the shortening of the service life of the parts due to this excessive temperature rise, the exterior housing 113 is equipped with a heat radiating port for releasing the heat generated by the heat generating components 118 to the outside of the housing, and It is indispensable to equip the cooling fan 123 that forcibly releases the heated atmosphere in the housing to the outside from the heat radiation port (a plurality of cooling fans are necessary depending on the cooling capacity of the fan).
[0015]
Equipping the flat display device 101 with the cooling fan 123 causes not only an increase in cost due to an increase in the number of components, but also an increase in the size of the device, which hinders a reduction in the thickness of the device. Further, since the operation sound of the cooling fan 123 leaks to the outside of the apparatus, there is a risk of impairing the quietness required for the audio apparatus or the like.
[0016]
Further, in the conventional flat display device 101, the heat generating component 118 is mounted on the dedicated heat sink 120 as a heat dissipation measure for the heat generating component 118 such as a power IC. Since the dedicated heat sink 120 is relatively large, it hinders thinning of the apparatus.
[0017]
For the problem to be solved by the present invention, it is indispensable to provide a shield case for accommodating a portion that requires an electromagnetic shield, which causes an increase in cost and a cooling fan is required. There is a problem that it may be necessary to reduce the thickness and silence of the device because it is indispensable, and a heat sink dedicated to the heat generating component is required, which increases the number of components and increases the cost. As mentioned.
[0018]
[Means for Solving the Problems]
According to the first aspect of the present invention, the drawing of the display panel is controlled on the back surface of the conductive chassis substrate having the flat display panel for displaying an image attached to the front surface based on the input image signal. A flat panel display device having a structure in which a panel drive unit and a source unit including an audio circuit for controlling an audio signal are provided, and a rear surface of the chassis substrate is covered with a conductive rear cover, the chassis substrate and the rear cover; A conductive case member that defines a circuit accommodating space in cooperation with the chassis substrate and the rear cover, and the source portion is accommodated in the case member. It is characterized by.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a flat display device according to a preferred embodiment of the present invention will be described in detail with reference to FIGS.
4 is a rear view of the flat display device according to the present embodiment with the rear cover removed, and FIG. 5 is taken along line BB in a state in which the rear cover is attached to the flat display device shown in FIG. FIG. 6 is a perspective view showing the structure of the source portion.
[0020]
As shown in FIGS. 4 and 5, the flat display device 1 includes a back surface of a conductive (metal or the like) chassis substrate 4 having a PDP 3, which is a flat display panel for displaying an image, attached to the front surface. Furthermore, a panel drive unit 5 that controls drawing of the PDP 3 based on the input image signal, a source unit 8 that includes an audio circuit 6 that controls an output signal to a speaker or the like based on the input audio signal, The power supply unit 2 is configured to supply power to the circuits of the respective units, and the rear surface of the chassis substrate 4 equipped with the respective units is covered with a conductive (metal or the like) rear cover 11.
The source unit 8 further includes a tuner circuit 7 that selects a received radio wave such as a TV radio wave and extracts an image signal input to the panel drive unit 5 and an audio signal input to the audio circuit 6. You may have.
The rear cover 11 also serves as a cover that covers an open portion of the rear surface of the front frame 12 that accommodates the display panel 3, and constitutes an exterior casing 13 that forms the appearance of the apparatus together with the front frame 12.
The PDP 3 has a laminated structure of a front substrate 3a and a back substrate 3b, and the back side of the back substrate 3b is bonded and fixed to the front surface of the chassis substrate 4 with a double-sided adhesive tape or the like. A front protective plate 14 that covers the front side of the PDP 3 is attached to the front surface of the front frame 12. The chassis substrate 4 is fastened and fixed to the front frame 12 with screws or the like.
[0022]
Further, a metal case member 17 having electrical conductivity and thermal conductivity that partitions the circuit housing space 16 in cooperation with the chassis substrate 4 and the rear cover 11 in a space surrounded by the chassis substrate 4 and the rear cover 11. The source part 8 including the audio circuit 6 is accommodated in the case member 17.
[0023]
The case member 17 defines a substantially enclosed rectangular parallelepiped circuit housing space 16 between the rear surface of the chassis substrate 4 and the inner surface of the rear cover 11, and the case member 17 itself includes the chassis substrate 4 and the rear cover. The part covered with 11 is a simple frame structure with an opening.
[0024]
The case member 17 is formed of a metal material that is excellent in both conductivity and thermal conductivity, such as aluminum, and is suitable for weight reduction. Further, a part of the case member 17 faces the chassis substrate 4 or the rear cover 11. In the contact state, the flat panel display device 1 is fixed to the rear panel 19 (panel having input / output terminals) at the bottom of the flat display device 1 with screws 20 or the like.
[0025]
In the present embodiment, as shown in FIG. 3, the heat-generating component 18 having a relatively large power consumption such as a power IC mounted on the audio circuit 6 included in the source unit 8 faces the peripheral wall of the case member 17. It is in close contact with the contact state and is mounted by being fixed with, for example, an epoxy resin.
[0026]
In the flat display device 1 described above, the case member 17 that accommodates the source unit 8 serves as an electromagnetic shield wall that blocks noise from the panel drive unit 5, and the source unit from the noise generated by the panel drive unit 5. 8 is protected.
[0027]
Therefore, the source unit 8 itself does not need a noise countermeasure that eliminates the influence of noise from the panel drive unit 5, and it is not necessary to mount a shield case or the like on the substrate 15, thereby reducing the number of parts and reducing the cost. Can be achieved.
[0028]
Moreover, the source part 8 includes a heat generating component 18 such as a power IC that generates a large amount of heat, and the source part 8 is housed in the circuit housing space 16 independent of the peripheral circuit part such as the panel driving part 5. Heat generation from the audio circuit 6 is prevented from affecting the operation of peripheral circuit units such as the panel drive unit 5.
[0029]
Therefore, as compared with the conventional device in which the peripheral circuit unit such as the panel driving unit 5 and the source unit 8 are accommodated in the same accommodation space, the heat generated in the source unit 8 is generated on the peripheral circuit unit side such as the panel driving unit 5. Since it is hardly transmitted to the housing space, it is possible to omit a cooling fan for preventing temperature rise. Therefore, the pressure on the housing space by the cooling fan can be eliminated, and at the same time, the number of parts can be reduced, and there is no operation noise of the cooling fan, so that the silence can be improved.
[0030]
In the present embodiment, since the heat generating component 18 included in the source portion 8 is mounted in close contact with the peripheral wall of the case member 17 in a surface contact state, the peripheral wall of the case member 17 that houses the source portion 8 is formed. The heat generating component 18 functions as a heat sink that releases the heat to the outside, and it is not necessary to prepare a dedicated heat sink for the heat generating component 18. Therefore, since there is no relatively large dedicated heat sink, the apparatus can be thinned.
[0031]
Further, since the heat generating component 18 can be attached to the left and right peripheral walls other than the peripheral wall in the upper part of FIG. 6 and the mounting surface is relatively large, a plurality of heat generating components 18 are mounted on the peripheral wall of the case member 17. You can also
[0032]
The heat conducted from the heat generating component 18 of the audio circuit 6 included in the source unit 8 to the case member 17 is the chassis substrate 4 or the rear cover 11 on which the case member 17 is fixed in a surface contact state, and the rear panel 19 fixed with screws or the like. Conducted by Thereby, the chassis substrate 4 and the rear cover 11 are usefully used as a heat sink, and efficient heat dissipation becomes possible. In particular, since the rear cover 11 is exposed to the outside of the flat display device 1 and is in contact with the outside air, heat can be efficiently radiated to the outside of the device.
[0033]
In the above-described embodiment, an example in which a PDP is used as a flat display panel is shown. However, the present invention is not limited to this, and other flat display panels such as an organic EL display panel and a liquid crystal display panel are used. The present invention can also be applied to a flat display device to be mounted.
[0034]
In addition, among the audio circuits 6 included in the source unit 8, some circuits (for example, audio preamplifiers) that do not require electromagnetic shielding and generate little heat are external to the case member 17, that is, the panel driving unit 5. You may install suitably in the accommodation space of the peripheral circuit part.
[0035]
According to the flat display device 1 according to the present embodiment, the PDP 3 based on the image signal input to the back surface of the conductive chassis substrate 4 attached to the front surface of the flat PDP 3 for displaying an image. This is a flat display device 1 having a structure in which a panel drive unit 5 for controlling the drawing of the image signal and a source unit 8 including an audio circuit 6 for controlling an audio signal are covered with a conductive rear cover 11. In addition, a case member 17 having conductivity that defines a circuit housing space 16 in cooperation with the chassis substrate 4 and the rear cover 11 is provided in a space surrounded by the chassis substrate 4 and the rear cover 11, and the case The source part 8 is accommodated in the member 17.
As a result, the case member 17 serves as an electromagnetic shield wall and protects the tuner circuit 7 and the audio circuit 6 in the source unit 8 from electromagnetic noise generated by the operation of the panel drive unit 5 and the power supply unit 2 and the discharge of the PDP 103. it can.
[0036]
In addition, the case member has thermal conductivity, and since the heat generating component constituting the source part is mounted in contact with the peripheral wall of the case member, a cooling fan, a large heat sink, or the like is not necessary. There is no loss of silence due to the operating sound, and since there is no installation space for these parts, it is possible to contribute to a reduction in the thickness of the apparatus and to reduce the cost of parts.
[Brief description of the drawings]
FIG. 1 is a back view of a conventional flat display device with a rear cover removed.
2 is a cross-sectional view taken along the line AA in a state where a rear cover is attached to the flat display device shown in FIG.
FIG. 3 is a perspective view illustrating an example of a structure of a source portion of a conventional flat display device.
4 is a back view of the flat display device according to the embodiment of the present invention with the rear cover removed. FIG.
5 is a cross-sectional view taken along line BB in a state where a rear cover is attached to the flat display device shown in FIG.
FIG. 6 is a perspective view showing an example of the structure of the source part of the flat display device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat display device 2 Power supply part 3 PDP (plasma display panel)
4 Chassis board 5 Panel drive unit 6 Audio circuit 7 Tuner circuit 8 Source unit 11 Rear cover 13 Exterior casing 16 Circuit housing space 17 Case member 18 (made of metal) Heating component

Claims (4)

A panel drive unit that controls drawing of the display panel based on an input image signal on the back surface of the conductive chassis substrate having a flat display panel for displaying an image attached to the front surface;
And a source unit including an audio circuit for controlling an audio signal, and a planar display device having a structure in which a rear surface of the chassis substrate is covered with a conductive rear cover,
In the space surrounded by the chassis substrate and the rear cover, equipped with a conductive case member that defines a circuit housing space in cooperation with the chassis substrate and the rear cover, and in the case member, A flat display device that accommodates the source portion. The flat display device according to claim 1, wherein the case member has thermal conductivity, and a heat-generating component constituting the source unit is mounted in contact with a peripheral wall of the case member. The flat display device according to claim 1, wherein the case member is fixed in surface contact with the chassis substrate or the rear cover. The flat display device according to claim 1, wherein the case member is made of metal.

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