JP2011160384A - Display apparatus - Google Patents

Abstract

A display device capable of reducing the temperature of a display panel is provided.
A display panel and a chassis (6) for supporting the display panel on a support surface via an adhesive sheet are provided. The chassis (6) has a recess (61) in which a part of the support surface is recessed on the back side. The recess (61) has openings on the top and bottom. The display panel can be efficiently cooled by the air flowing in from the lower opening (63b) passing through the upper opening (63a).
[Selection] Figure 1

Description

The present invention relates to a display device that displays a television image or the like, and more particularly to a heat dissipation structure thereof.

  In recent years, display devices using flat display panels have been increasing in size, thickness and image quality. A PDP (Plasma Display Panel), which is an example of a flat display panel, displays an image using a gas discharge phenomenon. The PDP can be thinned and can realize a large high-quality screen having a wide viewing angle. Further, the PDP generates a discharge in a gas-filled space formed between the electrodes by a direct current or an alternating voltage applied to the electrodes, and emits light by exciting the phosphor by the ultraviolet radiation associated therewith.

  FIG. 8 is a schematic cross-sectional view showing an internal configuration of a conventional PDP device 100. As shown in FIG. 8, inside the front cover 800 and the back cover 700 of the PDP apparatus 100 are a PDP panel 200 that displays an image, a chassis 600 that supports the panel on the front side, and a rear side of the chassis 600. A fixed circuit board 400 and a data driver 500 that transmits data to the PDP panel 200 are mainly accommodated.

The back cover 700 has upper and lower openings 710 for cooling the inside of the PDP device 100, sucks air from the lower opening, and discharges high-temperature air from the upper opening.
The chassis 600 is generally made of a metal such as aluminum. The chassis 600 is formed by casting or pressing.

  Here, the PDP panel 200 tends to become high temperature due to the operation principle of displaying an image using gas discharge in the panel. Moreover, when the PDP panel 200 is heated to a high temperature, the electric capacity of the electrodes formed therein changes, causing a problem that normal discharge is not performed. In order to prevent this, the PDP device 100 is a resin having high thermal conductivity between the chassis 600 and the PDP panel 200 for the purpose of keeping the PDP panel 200 at a predetermined temperature (for example, 70 to 80 ° C.) or lower. The heat conductive sheet 300 made of is sandwiched. With this configuration, the PDP device 100 effectively transmits the heat of the PDP panel 200 to the chassis 600 so that the effect of heat dissipation and the effect of temperature equalization can be obtained at the same time.

Japanese Patent No. 3223495

  However, a display panel such as the above-described PDP panel makes it difficult to reduce the temperature by increasing the power input to increase the brightness or by reducing the distance between the display panel and the substrate in order to reduce the thickness. It has become.

  The present invention has been made in view of the above problems, and an object thereof is to provide a display device that can reduce the temperature of a display panel with a relatively simple structure.

  In order to achieve the above object, a display device of the present invention includes a display panel and a chassis that supports the display panel on a support surface via an adhesive sheet, and the chassis has a part of the support surface. It has a recessed part dented in the back side, and the said recessed part has an opening part up and down.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can reduce the temperature of a display panel with a comparatively simple structure can be provided.

(A) Rear perspective view of PDP device according to embodiment 1, (b) exploded view Sectional view in A-A 'section (A) The perspective view which expanded the recessed part 61, (b) Sectional drawing in a C-C 'cross section Explanatory drawing showing another method of forming recesses The perspective view which expanded the recessed part 65 in Embodiment 2. FIG. Sectional drawing of the PDP apparatus in Embodiment 3 The perspective view which expanded the recessed part 65 in Embodiment 3. FIG. Schematic sectional view showing the internal structure of a conventional PDP device

  Hereinafter, embodiments of a display device according to the present invention will be described with reference to the drawings. In the following embodiments, a PDP device using a PDP as a display panel will be described as an example of a display device. In addition, in the embodiment, components that perform the same operation may be denoted by the same reference numerals, and description thereof may be omitted.

(Embodiment 1)
A PDP device that is a display device according to Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1A is a rear perspective view of the PDP device 1 according to the first embodiment, and FIG. 1B shows an exploded view thereof. In FIG. 1, the front cover and the back cover are not shown. FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG. FIG. 2 shows a front cover and a back cover. Hereinafter, for convenience of explanation, the normal direction of the display surface of the PDP device 1 is referred to as the x axis, the longitudinal direction of the display surface of the PDP device 1 is referred to as the y axis, and the direction orthogonal to the x axis and the y axis is referred to as the z axis. . Further, the positive direction of the x axis, that is, the display surface direction is the front direction, the negative direction of the x axis is the rear direction, the direction of the y axis is the left-right direction, the positive direction of the z axis is upward, and the negative direction of the z axis is The direction is called the downward direction.

  As shown in FIG. 2, the PDP device 1 is configured such that a PDP panel 2 as an image display panel is covered with a front cover 8 made of resin and a back cover 7 made of a conductive material such as iron. The back cover 7 has upper and lower heat radiation openings 71 for cooling the inside of the PDP apparatus 1, sucks air from the lower opening, and discharges high-temperature air from the upper opening.

  The PDP panel 2 is configured by bonding front and back glass substrates having transparent electrodes. In the PDP panel 2, a discharge gas such as neon gas or xenon gas is sealed in a minute gap between the two glass substrates. The PDP panel 2 generates discharge by applying a voltage to the electrodes, and generates ultraviolet rays by changing the discharge gas to a plasma state. Then, the PDP panel 2 stimulates red, blue, and green phosphors applied to the rear glass substrate with the ultraviolet rays to display and display an image. For example, electrodes are arranged in the left-right direction on the front glass and in the up-down direction on the rear glass, and light emission at a location corresponding to the intersection can be controlled. A single glass substrate has a thickness of about 1.5 mm to 3 mm. The PDP panel 2 repeats discharge over the entire surface by such a mechanism and displays an image. For this reason, the PDP panel 2 tends to be hot. The power consumption of the PDP device 1 as a whole is 300 to 500 W, whereas the power consumption of the PDP panel 2 is about 200 to 300 W, accounting for about half or more of the whole.

  Between the PDP panel 2 and the chassis 6 that supports the PDP panel 2 on the front side, a heat conductive sheet 3 made of a resin having high heat conductivity is sandwiched. The heat conductive sheet 3 has a rectangular area as viewed from the front side that is substantially equal to the PDP panel 2 and has a thickness of about 0.5 to 4 mm. The heat conductive sheet 3 basically improves the heat conduction effect of conducting heat generated from the PDP panel 2 to the chassis 6 by closely contacting the PDP panel 2 composed of a glass substrate and the chassis 6 made of metal. Yes. Furthermore, the heat conductive sheet 3 can absorb the warp in the PDP panel 2 and the chassis 6. Moreover, the heat conductive sheet 3 can relieve the impact from the outside. For this reason, as the material of the heat conductive sheet 3, silicon having both flexibility and heat conductivity is used. It is more preferable to use a graphite sheet having a large thermal diffusion effect.

  The chassis 6 is made of metal having a shape and an area viewed from the front that are substantially equal to the PDP panel 2 and a thickness of about 1.5 to 4 mm. The chassis 6 points to the PDP panel 2 on the support surface on the front side. Further, the chassis 6 has a role of supporting the entire PDP panel 2 by holding it in a space surrounded by the front cover 8 and the back cover 7. In addition, the chassis 6 achieves heat equalization by diffusing the heat conducted from the PDP panel 2 through the heat conductive sheet 3 in the in-plane direction of the chassis 6 itself, and the chassis 6 and the back cover 7 It plays the role of radiating heat to the space between. For this reason, as the material of the chassis 6, aluminum having a good thermal conductivity is used. Further, the chassis 6 may be formed with heat radiation fins on the back side (back cover 7 side) as necessary. Furthermore, the chassis 6 may be provided with ribs in the vertical direction and the horizontal direction for reinforcement.

  On the rear side of the chassis 6, a power supply circuit board 4 for supplying power to each board, a tuner block 12 for inputting various image signals from the outside and performing various signal processing, and signals to the electrodes of the PDP panel 2. A panel drive circuit board 5 or the like constituting a drive circuit or the like for giving an image display is screwed to a boss 64 of the chassis 6 so as to be parallel to the PDP panel 2.

  As shown in FIG. 1, the data drivers 9 are arranged in a horizontal row in a component arrangement area B provided on the lower side of the chassis 6. Usually, 8 to 15 data drivers 9 are installed according to the resolution of the image and the size of the screen.

  Next, the configuration of the chassis 6 will be described more specifically.

  The chassis 6 has a recess 61 in which a part of the support surface is recessed on the back side. An enlarged view of the recess 61 is shown in FIG. 3A is an enlarged perspective view of the recess 61, and FIG. 3B is a cross-sectional view taken along the line C-C 'of FIG. 3A.

  The recess 61 has an upper opening 63a and a lower opening 63b. The concave portion 61 is formed by drawing to narrow the support surface of the chassis 6 to the back side. More specifically, a cut is formed at a position where the upper opening of the chassis 6 is formed and a position where the lower opening is formed, and the drawing is performed by pressing between the cuts from the support surface side. By such a forming method, the recess 61, the upper opening 63a, and the lower opening 63b can be easily formed in the chassis 6. The recess 61 has a horizontal width of 1 cm to 5 cm and a vertical length of about 5 cm to 30 cm. However, it is not restricted to these numerical values. The size can be appropriately selected according to the size of the PDP panel 2 and the size of the substrate mounted on the chassis 6. Moreover, the upper side opening part 63a and the lower side opening part 63b have the opening of the same magnitude | size.

  As shown in FIG. 3B, by forming the recess 61, a flow path 62 through which air flows can be formed between the heat conductive sheet 3 and the chassis 6 (between the recess 61). The heat conductive sheet 3 can directly come into contact with the air when the air entering from the lower opening 63b passes through the flow path 62 and escapes from the upper opening 63a, and the temperature is lowered. As a result, the temperature of the PDP panel 2 can be lowered.

  Further, the recess 61 has a vertically long shape in which the length in the vertical direction is longer than the width on the left and right. With such a shape, a chimney effect can be given to the air passing through the flow path 62. That is, when the air in the flow path 62 is warmed and rises, negative pressure is applied to the air near the lower opening 63b, and the air flows in. As a result, the flow of air can be promoted by having a vertically long shape, and the temperature reduction effect of the PDP panel 2 can be further enhanced.

  In addition, a component placement region B is provided below the recess 61 on the rear surface of the chassis 6. That is, parts can be arranged below the lower opening 63 b of the recess 61. In the component arrangement area B, a data driver 9 that is a heat generating component is arranged. The air near the lower opening 63b is warmed by the heat generated by the data driver 9. Therefore, the chimney effect with respect to the air passing through the flow path 62 can be enhanced. As a result, the temperature reduction effect of the PDP panel 2 can be further enhanced. In particular, the data driver 9 used for display on the PDP panel 2 is one of the components that generate a large amount of heat in the PDP device 1. By forming the component arrangement region B in the chassis 6 and arranging components having large heat generation in the component arrangement region B in this way, the chimney effect can be used efficiently.

  In the present embodiment, the recesses 61 are formed at two positions on the left and right sides of the rear surface of the chassis 6, but the present invention is not limited to this configuration. Only one or three or more may be provided. The position to be formed can be appropriately changed according to the arrangement of the substrates attached to the back surface of the chassis 6 and the size of the PDP panel 2.

  Further, in the present embodiment, the drive circuit board 5 is attached so as to cover the recess 61 from the back side, but the position of the recess 61 may be another position. Alternatively, the boss 64 may be attached to the recess 61, and the drive circuit board 5 or the like may be attached.

  In the present embodiment, the heat conduction sheet 3 is in direct contact with air in the flow path 62. However, the heat conduction sheet 3 in this portion is removed so that the PDP panel 2 and air are in direct contact with each other. Good. According to such a structure, the temperature of the part which is in contact with the air in PDP panel 2 can be reduced more. However, from the viewpoint of making the temperature of the PDP panel 2 uniform, it is preferable not to remove the heat conductive sheet 3.

  Further, in the present embodiment, the recess 61 is formed by a drawing process for narrowing the support surface of the chassis 6 to the back side, but the present invention is not limited to this. For example, as shown in FIG. 4, a wall portion 611 can be attached to the hole portion 610 provided in the chassis 6 from the back side. With such a configuration, it is possible to realize even a concave shape that is difficult to draw. The same applies to other embodiments described below.

(Embodiment 2)
Next, a PDP apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in that a recess 65 having a different shape is used instead of the recess 61 formed in the chassis 6. Other configurations are the same as those in the first embodiment, and the description thereof will be omitted.

  FIG. 5 shows an enlarged perspective view of the recess 65 in the present embodiment. The recess 65 has a shape in which the width in the left-right direction is wider on the lower side than on the upper side. The width gradually increases from the upper side to the lower side. The lower opening 63b is larger than the upper opening 63b.

  By having such a configuration, it is possible to increase the amount of air flowing in from the lower opening 63b while enhancing the chimney effect. As a result, the temperature reduction effect can be further increased as compared with the first embodiment.

  In the present embodiment, the recess 65 has a shape in which the width in the left-right direction is wider on the lower side than on the upper side. For example, the width in the front-rear direction (x-axis direction) is higher than that on the upper side. Alternatively, the lower side may have a wider shape. Moreover, both of them may be sufficient. In short, it suffices if the lower opening is larger than the upper opening.

(Embodiment 3)
Next, a PDP apparatus according to Embodiment 3 of the present invention will be described with reference to FIGS. The present embodiment is different from the second embodiment in that the recess 65 formed in the chassis 6 and the component mounted on the drive circuit board 5 are in contact with each other. Other configurations are the same as those in the second embodiment, and the description thereof will be omitted.

  FIG. 6 is a cross-sectional view of the PDP device 10 in the present embodiment, and corresponds to FIG. 2 of the first embodiment. FIG. 7 shows an enlarged perspective view of the recess 65 in the present embodiment.

  As shown in FIG. 6, an IC 50, which is a heat generating component, is mounted on the drive circuit board 5 in the present embodiment. The IC 50 is mounted on the surface of the drive circuit board 5 on the chassis 6 side. The package surface of the IC 50 is in contact with the recess 65 of the chassis 6. With such a configuration, the IC 50 can be radiated using the recess 65. That is, the heat dissipation effect of the IC 50 can be obtained without separately providing a member such as a heat radiating fin in the IC 50 that is a heat generating component.

  Further, as shown in FIG. 7, the IC 50 is preferably in contact with a position closer to the lower opening 63 b than the upper opening 63 a of the recess 65. According to such a structure, the lower side of the recessed part 65 can be warmed. Therefore, the air near the lower opening 63b can be warmed. Thereby, the chimney effect is further enhanced, and the temperature reduction effect can be further enhanced.

  In the present embodiment, the IC 50 is in direct contact with the recess 65, but may be configured to contact through a heat conducting member such as an adhesive sheet.

  The display device according to the present invention has been described based on the embodiment, but the present invention is not limited to this embodiment. Unless it deviates from the meaning of this invention, the form which carried out the various deformation | transformation which those skilled in the art can think to the said embodiment, and the form constructed | assembled combining the component in a different embodiment is also contained in the scope of the present invention. .

  That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for temperature reduction in a display device having a display panel such as a plasma display panel.

DESCRIPTION OF SYMBOLS 1,10 PDP apparatus 2 PDP panel 3 Thermal conductive sheet 4 Power supply circuit board 5 Drive circuit board 50 IC
6 Chassis 61, 65 Concave 62 Flow path 63a Upper opening 63b Lower opening 610 Hole 611 Wall 7 Back cover 71 Radiation opening 8 Front cover 9 Data driver 11 Tuner block

Claims (11)

A display panel;
A chassis that supports the display panel on a support surface via an adhesive sheet,
The chassis has a recess in which a part of the support surface is recessed on the back side,
The concave portion has openings on the upper and lower sides,
Display device. The lower opening is larger than the upper opening;
The display device according to claim 1. The concave portion is longer in the vertical direction than the left and right widths,
The display device according to claim 1. The width of the recess is wider on the lower side than on the upper side,
The display device according to claim 1. The width of the recess gradually widens from the upper side to the lower side,
The display device according to claim 4. The chassis has a component placement region below the recess,
A heat generating component is provided in the component arrangement area.
The display device according to claim 1. The display panel is a plasma display panel;
The heat generating component is a data driver of the plasma display panel.
The display device according to claim 6. A circuit board that is attached to the rear side of the chassis and has a heat generating component on the front side,
The heat-generating component is in contact with the back side of the recess directly or through a heat conducting member,
The display device according to claim 1. The heat-generating component is in contact with a position on the back side of the recess and closer to the lower opening than the upper opening, directly or via a heat conducting member,
The display device according to claim 8. The recess is formed by drawing to squeeze the support surface to the back side.
The display device according to claim 1. The concave portion is formed by attaching a wall portion from the back side to the hole portion provided in the support surface.
The display device according to claim 1.

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