JP2000010493A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve the temp. difference between the display part and non- display part of a display panel. SOLUTION: A frame chassis 12 which exists on the rear surface side of the display panel 4 and is fixed with the display panel 4 is formed to an annular shape corresponding to the peripheral part of the display panel 4 inclusive of the non-display part around the display panel 4. The heat generated in the display part is transferred via the frame chassis 12 to the non-display part, by which the temp. of the display part may be lowered and the temp. of the non-display part may be elevated. Consequently, the temp. difference between the display part and the non-display part is diminished and the temp. gradient from the display to the non-display part is relieved, by which a thermal stress may be suppressed to a lower level and the destruction by the heat of the display panel 4 may be prevented. Since the frame chassis 12 exists only in the peripheral part inclusive of the non-display part of the display panel 4, the weight of the frame chassis 12 may be reduced. A heat conduction sheet 9 may be interposed between the display panel 4 and the frame chassis 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a plasma display, and more particularly to a structure of a frame chassis for preventing a display panel of the present display device from being damaged by heat.

[0002]

2. Description of the Related Art In recent years, a plasma display panel (hereinafter, referred to as PDP) device has been put into practical use as a large-screen image display device. As shown in FIGS. 7 and 8, the PDP device usually includes frame chassis 6 and 7 inside the housing 3. There are two main types of frame chassis. One is a metal member 61 such as aluminum which has good mechanical rigidity and is lightweight, as shown in FIG.
Are combined with a rivet 63 or the like. A PDP 4 formed by bonding two glass substrates is attached to the front surface of the frame chassis 6. As a mounting method, the PDP 4 is fixed to the frame chassis 6 with the double-sided adhesive tape 5. In addition, since the PDP 4 becomes high in temperature due to internal discharge during light emission display, a cooling fan 11 (not shown) is installed on the upper part of the housing 3 and the high-temperature air inside the housing 3 is cooled by the cooling fan. , The temperature rise of the PDP 4 is suppressed.

As shown in FIG. 8, another frame chassis is made of a single metal plate 62 such as aluminum, which has good mechanical rigidity and thermal conductivity and is lightweight. Like the former,
The PDP 4 is fixed to the front surface of the frame chassis 7 with a double-sided adhesive tape 5. When the PDP 4 is fixed by the double-sided adhesive tape 5 disposed around the frame chassis 7 in order to suppress the temperature rise of the PDP 4, a heat conductive sheet 9 is interposed between the frame chassis 7 and the PDP 4, and this heat conduction is performed. The heat generated in the PDP 4 by the sheet 9 is efficiently conducted to the frame chassis 7 to dissipate the heat.

[0004]

However, in the former method, the temperature difference between the display portion and the non-display portion around the PDP which causes the destruction of the PDP 4 due to heat cannot be reduced. P to avoid
There is a problem that the power of the DP4 cannot be increased, that is, the luminance of the light emission display of the PDP4 cannot be increased.

More specifically, referring to FIG. 9, the PDP 4 includes a front glass 71 and a rear glass 72, and two sheets of glass are bonded together with a predetermined gap 74 therebetween. Therefore, the front glass 71 and the rear glass 7 are provided around the PDP 4.
There is an adhesive portion 73 for bonding the two, and the adhesive portion 73 is a non-display portion that is not turned on. When a white rectangular area with high brightness is displayed close to the non-display area,
A temperature difference occurs between the non-display part and the display part, and thermal stress occurs near the boundary between the non-display part and the display part. When the temperature difference between the non-display part and the display part increases and reaches a certain value, PDP4
Leads to destruction.

In the latter method, there is a problem that the weight increases because the frame chassis 7 made of a metal plate 62 made of aluminum or the like having substantially the same size as the PDP 4 is used. Further, since the double-sided adhesive tape 5 is disposed around the frame chassis, there is a problem that the efficiency of heat conduction to the non-display part of the PDP 4 is low, and the temperature difference between the display part and the non-display part is not easily reduced.

Accordingly, an object of the present invention is to solve the above-mentioned problem, and to provide a video display device capable of reducing a temperature difference between a display portion and a non-display portion of a display panel.

[0008]

According to a first aspect of the present invention, there is provided an image display apparatus comprising: a frame chassis to which a display panel is fixed and which is located on a rear side of a display panel; It is characterized in that it has an annular shape corresponding to the peripheral portion of the display panel including the surrounding non-display portion.

As described above, since the frame chassis is formed in an annular shape corresponding to the peripheral portion of the display panel including the non-display portion around the display panel, heat generated in the display portion is transmitted to the non-display portion via the frame chassis. This can lower the temperature of the display unit and increase the temperature of the non-display unit. As a result, the temperature difference between the display unit and the non-display unit is reduced, and the temperature gradient from the display unit to the non-display unit is moderated, and the thermal stress can be reduced. it can. Further, since the frame chassis exists only in the peripheral portion including the non-display portion of the display panel, the weight of the frame chassis can be reduced.

[0010] The image display device according to the second aspect is the first aspect.
In the above, the heat conductive sheet was interposed between the display panel and the frame chassis. As described above, since the heat conductive sheet is interposed between the display panel and the frame chassis, the adhesion between the display panel and the frame chassis is increased, the efficiency of heat conduction is increased, and the temperature difference can be further reduced. According to a third aspect of the present invention, in the first or second aspect, the heat radiation fins are provided on a surface of the frame chassis opposite to the display panel. In this way, the radiation fins are provided on the surface of the frame chassis opposite to the display panel, so the heat radiation capacity of the display is improved and the temperature of the display is reduced, so the temperature difference with the non-display is further reduced. It is effective.

According to a fourth aspect of the present invention, there is provided the image display device, wherein a temperature control device capable of controlling the temperature of the non-display portion is provided so that the temperature difference between the display portion of the display panel and the non-display portion around the display panel is reduced. It is characterized by having. As described above, the temperature control device capable of controlling the temperature of the non-display section is provided so that the temperature difference between the display section of the display panel and the non-display section around the display panel is reduced. The temperature of the non-display portion can be controlled in accordance with the detected temperature rise.
Therefore, the temperature difference between the display portion and the non-display portion can be suppressed, and the display panel can be reliably prevented from being damaged by heat. Further, the provision of the temperature control device does not require the frame chassis to have a configuration having thermal conductivity, so that the weight of the frame chassis can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a plasma display device (video display device) according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a positional relationship between a display panel and a frame chassis in the first embodiment,
FIG. 3 is a cross-sectional view showing a state where the display panel and the frame chassis are mounted in the first embodiment. As shown in FIG. 1, this plasma display device includes a housing 3 configured by combining a front housing 1 and a rear housing 2 into one, and an internal unit housed inside the housing 3. 20. A plurality of ventilation holes 52 are formed in the upper and lower parts of the front housing part 1 side by side in the width direction, and have a light transmitting part 51 made of glass or the like on the front surface. Also,
A plurality of ventilation holes 52 are also formed in the upper and lower portions of the rear housing 2 in a row in the width direction.

The internal unit 20 includes the frame chassis 1
2, a display panel (PDP) 4 attached to the front of the frame chassis 12, a heat conductive sheet 9 made of silicon or the like interposed between the frame chassis 12 and the display panel 4, and a back panel of the frame chassis 12. And a plurality of circuit boards 8 supported. The frame chassis 12 includes an annular heat conducting plate 65 corresponding to a peripheral portion of the display panel 4 including a non-display portion around the display panel 4,
Further, a fixing boss 64 for attaching the circuit board 8 to the heat conductive plate 65 is provided. Specifically, as shown in FIGS. 2 and 3, since heat generated in the panel display unit 77 is transmitted to the panel non-display unit 76 via the frame chassis 12, the heat conductive plate 65 is connected to the panel of the display panel 4. Non-display section 76
From the panel display portion 77 side.
In this case, the heat conducting plate 65 is made of a lightweight metal having good heat conductivity such as aluminum or magnesium, the outer dimensions are equal to the outer dimensions of the display panel 4, and the annular portion has a width of 1 mm.
It is from 0 cm to 15 cm and the thickness is from 1 mm to 3 mm. As shown in FIG. 4A, the fixing boss 64 and the heat conductive plate 65 may be integrated. In addition, as shown in FIG. 4B, heat radiation fins 66 are provided on the surface of the heat conductive plate 65 opposite to the display panel 4 in order to improve the heat radiation capability of the panel display unit.
May be provided.

The heat conductive sheet 9 is formed of a material having high heat conductive efficiency, for example, silicone or acrylic foam, and has a double-sided adhesive ability. This prevents a local decrease in heat conduction efficiency due to the use of the double-sided adhesive tape, and improves the efficiency of heat conduction between the display panel 4 and the heat conduction plate 65. The circuit board 8 performs light emission driving of the display panel 4 and control thereof.

The display panel 4 comprises a front glass 71 and a rear glass 72, as shown in FIG.
Two sheets of glass are bonded together with a predetermined gap 74 therebetween. Therefore, there is an adhesive portion 73 around the display panel 4 for bonding the front glass 71 and the rear glass 72, and the adhesive portion 73 is a non-display portion that is not lit, and a display portion that is surrounded by the adhesive portion 73 and is lit. Becomes In this case, the front glass 71 is longer in the long side direction and shorter in the short side direction than the rear glass 72. Therefore, the front glass 71 and the rear glass 72 each have a portion that does not overlap each other, and a terminal connected to an electrode inside the display panel 4 is formed in the non-overlapping portion (not shown). A plurality of film-like wirings (not shown) having a male connector at the tip are crimped to the terminals, and the male connector is connected to a female connector (not shown) provided at the edge of each circuit board 8. Each circuit board 8 is connected to each other.
And the display panel 4 are electrically connected.

In the video display device configured as described above,
Since the annular heat conductive plate 65 is provided in the peripheral portion including the non-display portion of the display panel 4, the heat generated in the display portion is transmitted to the non-display portion via the heat conductive plate 65 to reduce the temperature of the display portion. At the same time, the temperature of the non-display section is increased. as a result,
As the temperature difference between the display unit and the non-display unit becomes smaller, the temperature gradient from the display unit to the non-display unit becomes gentler, the thermal stress can be reduced, and the display panel 4 can be prevented from being damaged by heat. Further, since the heat conduction plate 65 is present only in the peripheral portion including the non-display portion of the display panel 4, the weight of the frame chassis 12 can be reduced.

Also, by interposing the heat conductive sheet 9 between the display panel 4 and the heat conductive plate 65, the adhesion between the display panel and the frame chassis is increased, and the efficiency of heat conduction is increased.
The temperature difference can be further reduced. Further, FIG.
By providing the radiation fins 66 on the surface of the frame chassis 12 opposite to the display panel 4 as shown in FIG.
Because the heat radiation capacity of the display unit improves and the temperature of the display unit falls,
The temperature difference from the non-display portion is further reduced, which is effective.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an exploded perspective view of the video display device according to the second embodiment of the present invention. As shown in FIG. 5, the internal unit 21 of the video display device includes a frame chassis 6 having a fixed boss 64 and a metal member 61 such as aluminum, which is lightweight and has high mechanical rigidity, combined with rivets 63 and the like. A display panel 4 attached to the front of the display panel 6 with a double-sided adhesive tape 5
And a temperature control device 10 arranged in a non-display portion around the display panel 4, and a fixed boss 64 on the back of the frame chassis 6.
And a plurality of circuit boards 8 supported by the same. Case 3
The display panel 4 is configured in the same manner as in the first embodiment.

The temperature control device 10 includes a heater 82 (hatched portion) disposed on the front side of a non-display portion around the display panel.
And a temperature sensor 81 installed on the back side to control the temperature difference between the non-display part of the display panel 4 and the two adjacent points of the display part so as to prevent the display panel 4 from being damaged by heat. Have been. The temperature sensor 81 detects a temperature difference between the non-display section and the display section, and is installed near the center of the four sides of the display panel 4 as shown in FIG. In this case, the temperature sensor 81 is configured to detect the temperature difference by a pair of the non-display section temperature sensor 83 and the display section temperature sensor 84. The non-display part temperature sensor 83 is installed at the center of the non-display part in the width direction, and the display part temperature sensor 84 is installed at a position symmetrical to the non-display part temperature sensor 83 with the boundary between the non-display part and the display part interposed therebetween. The distance between the two sensors 83 and 84 is 2-3 cm. Further, two or three sets of temperature sensors 81 are installed on each side of the display panel 4.

The destruction of the display panel 4 by heat occurs when a temperature difference between two adjacent points of the non-display part and the display part is about 20 ° C. Therefore, the temperature control device 10
, The temperature difference between the non-display portion and the display portion is detected, and when the temperature difference reaches 15 ° C., the non-display portion is heated by the heater 82 to reduce the temperature difference between the non-display portion and the display portion. Further, the temperature difference between the non-display portion and the display portion is reduced by 1 by heating the heater 82.
When the temperature reaches 0 ° C., the heating by the heater 82 is stopped. During the light emission display of the display panel 4, the temperature difference is always detected by the temperature sensor 81 and the temperature control is performed as described above.

As described above, in this embodiment, the temperature control device 10 is installed in place of the annular heat conducting plate, and the temperature rise of the display unit is reduced so that the temperature difference between the display unit and the non-display unit is reduced. Is sensed and the temperature of the non-display portion is controlled in accordance with the temperature rise, so that the display panel can be reliably prevented from being damaged by heat. Further, since the heat conduction plate is eliminated, the weight of the frame chassis 6 can be reduced.

Note that if the display panel device is installed only in a configuration in which the display panel device is set up in a nearly vertical position, it is not necessary to install the temperature sensor 81 and the heater 82 on the upper side 75 of the display panel 4. . Further, the frame chassis 12 of the first embodiment may be used instead of the frame chassis 6, and the heat conductive sheet 9 may be used instead of the double-sided adhesive tape 5.

[0023]

According to the video display device of the first aspect of the present invention, the frame chassis is formed in an annular shape corresponding to the peripheral portion of the display panel including the non-display portion around the display panel. The generated heat is transmitted to the non-display section via the frame chassis, so that the temperature of the display section can be lowered and the temperature of the non-display section can be raised. As a result, the temperature difference between the display unit and the non-display unit is reduced, and the temperature gradient from the display unit to the non-display unit is moderated, and the thermal stress can be reduced. it can. Further, since the frame chassis exists only in the peripheral portion including the non-display portion of the display panel, the weight of the frame chassis can be reduced.

According to the second aspect of the present invention, since the heat conductive sheet is interposed between the display panel and the frame chassis, the adhesion between the display panel and the frame chassis is increased, the heat conduction efficiency is increased, and the temperature difference is further reduced. Can be. According to the third aspect, since the radiation fins are provided on the surface of the frame chassis opposite to the display panel, the heat radiation capability of the display unit is improved and the temperature of the display unit is reduced, so that the temperature difference with the non-display unit is further reduced. It is effective.

According to the video display device of the present invention, the temperature of the non-display portion can be controlled so that the temperature difference between the display portion of the display panel and the non-display portion around the display panel becomes small. Since the temperature control device is provided, it is possible to sense a rise in the temperature of the display unit and control the temperature of the non-display unit according to the rise in the temperature. Therefore, the temperature difference between the display portion and the non-display portion can be suppressed, and the display panel can be reliably prevented from being damaged by heat. Further, the provision of the temperature control device does not require the frame chassis to have a configuration having thermal conductivity, so that the weight of the frame chassis can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a video display device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a positional relationship between a display panel and a frame chassis according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where the display panel and the frame chassis are mounted in the first embodiment of the present invention.

FIGS. 4A and 4B are perspective views each showing another form of the heat conducting plate.

FIG. 5 is an exploded perspective view of a video display device according to a second embodiment of the present invention.

FIG. 6 is a rear view of the display panel showing a position of a temperature sensor in the second embodiment.

FIG. 7 is an exploded perspective view of a conventional image display device.

FIG. 8 is an exploded perspective view of another conventional image display device.

9A is a partially cutaway front view of the display panel, and FIG.
Is a sectional view taken along the line A-A.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 front case 2 back case 3 case 4 PDP 5 double-sided adhesive tape 6 frame chassis 7 frame chassis 8 circuit board 9 heat conductive sheet 10 temperature control device 11 cooling fan 12 frame chassis 20 internal unit 21 internal unit 51 light transmitting unit 52 Ventilation port 71 Front glass 72 Back glass 73 Adhesive part 74 Gap 75 Upper side 76 Panel non-display part 77 Panel display part 61 Metal member 62 Metal plate 63 Rivets 64 Fixing boss 65 Heat conduction plate 66 Heat radiation fin 81 Temperature sensor 82 Heater 83 Non Display temperature sensor 84 Display temperature sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroto Inoue 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C058 AA11 AB01 AB06 BA30 5G435 AA12 BB06 EE04 EE05 EE13 GG44 HH12 LL04

Claims (4)

[Claims] 1. A frame chassis, which is located on the back side of a display panel and to which the display panel is fixed, has an annular shape corresponding to a peripheral portion of the display panel including a non-display portion around the display panel. Video display device. 2. The image display device according to claim 1, wherein a heat conductive sheet is interposed between the display panel and the frame chassis. 3. The image display device according to claim 1, wherein a radiation fin is provided on a surface of the frame chassis opposite to the display panel. 4. An image characterized by comprising a temperature control device capable of controlling the temperature of the non-display part so that the temperature difference between the display part of the display panel and the non-display part around the display panel is reduced. Display device.