JP3499847B2 - Plasma display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device. 2. Description of the Related Art In recent years, a plasma display device has been put into practical use as a thin, lightweight image display device having a large screen. This plasma display device usually includes a metal frame chassis inside a case, and a plasma display panel (hereinafter, referred to as a PDP) formed by bonding two glass substrates is attached to the front of the frame chassis. ing. [0003] The PDP is heated to a considerably high temperature due to internal discharge during light emission display. If this is left, PD
It is necessary to suppress the temperature to a predetermined temperature or less because P may be damaged. As an effective method for this purpose, when a PDP is mounted on a frame chassis, a heat conductive sheet made of a silicon-based resin or the like is interposed between the PDPs, and the heat generated by the PDP is efficiently conducted to the frame chassis by this sheet to dissipate heat. There is a way to make it happen. SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a plasma display device capable of efficiently dissipating heat of a PDP. [0005] In order to solve the above-mentioned problems, a plasma display device according to the present invention comprises a metal frame chassis and a front surface mounted on the frame chassis .
And an internal unit having a PDP formed by bonding two glass substrates, and a case containing the internal unit and including a front case portion and a back case portion. P
Adhere to frame chassis and PDP between DP
With the interposition of sea urchin heat conductive sheet, in which is disposed a circuit board which performs PDP of the light emission drive on the rear side of the frame chassis, and to form a plurality of vent holes in the back case unit. Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a plasma display device 10 according to one embodiment of the present invention. The plasma display device 10 includes a front case portion 14 and a back case portion 16 which are combined to form the case 12, and an internal unit 26 housed in the case 12. A plurality of ventilation holes 1 are provided at the upper and lower parts of the front case part 14, respectively.
8 and 20 are formed in the width direction, and have a light transmitting part 22 made of glass or the like on the front surface thereof. Further, a plurality of ventilation holes 18 and 20 (only the upper ventilation hole 18 is shown) are formed in the upper and lower portions of the back case portion 16 in the width direction, respectively. The internal unit 26 includes an aluminum frame chassis 28, a PDP 32 attached to the front of the frame chassis 28, a heat conductive sheet 34 interposed between the frame chassis 28 and the PDP 32, It comprises a plurality of circuit boards 36 supported on the back. The circuit board 36 drives the PDP 32 to emit light and controls the light emission. The PDP 32 includes a front panel and a rear panel, and although not shown in the drawing, the front panel is longer in the long side direction and shorter in the short side direction than the rear panel. Therefore, the front plate and the back plate each have a portion that does not overlap each other, and the non-overlapping portion includes the PDP 32
Terminals connected to the inner electrodes are formed (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 36. By connecting each of them, each circuit board 36 and PDP 32 are electrically connected. The heat conductive sheet 34 has good heat conductive efficiency,
Moreover, it is made of flexible silicone resin, etc.
The heat generated at 32 is efficiently transferred to the frame chassis 28 and functions as a cushioning material. As shown in FIG. 1, the heat conductive sheet 34 has substantially the same size as the PDP 32. Further, the heat conductive sheet 34 is composed of a plurality of sheet pieces 40 , and the sheet pieces 40 are arranged in a checkerboard shape with no gap.
Have been . FIG. 2 is a plan view of a contact surface of the sheet piece 40 with the PDP 32 and a side view thereof. As shown in FIG. 2, on one surface of the sheet piece 40, a plurality of rectangular convex portions 44 separated by a lattice-shaped groove-shaped concave portion 42 are formed in a matrix. The sheet piece 40 is a square having a side of 100 mm and a thickness of 2 mm, the rectangular projection 44 is a square having a side of 13 mm, a projection height h is 1 mm, and a width w of the groove-shaped recess 42 is 2 mm.
, But their shapes and dimensions are not limited and can be changed as appropriate. Next, the PDP 3 to the frame chassis 28
4 is assembled as shown in FIG. 3 (illustration of the convex portion 44 of the sheet piece 40 is omitted). First, frame chassis 2
A double-sided adhesive tape 48 is stuck on the four sides around the front surface of 8. The thickness of the double-sided adhesive tape 48 is substantially the same as that of the heat conductive sheet 34. Then, a heat conductive sheet 34 composed of a plurality of arranged sheet pieces 40 is placed on the frame chassis 28, and the intervening air is completely extruded using a roller or the like to bring the heat conductive sheet 34 into close contact with the frame chassis 28. . Since both surfaces of the heat conductive sheet 34 are adhesive, once the frame is in close contact with the frame chassis 28, air does not enter later. Subsequently, the PDP 32 is placed on the double-sided adhesive tape 48 and the heat conductive sheet 34, and lightly pressed by hand from above. Then, the PDP 32 is pressed against the protrusions 44 of each sheet piece 40, and at this time, the rectangular protrusions 44 are crushed and swell in the lateral direction. In the process of inflation, the groove-shaped concave portion 42 of the sheet piece 40 serves as an air discharge passage and air is pushed out, and finally the groove-shaped concave portion 42 is not filled up by the lateral protrusion of the rectangular convex portion 44. . As a result, the air layer is almost completely eliminated between the heat conductive sheet 34 and the PDP 32 so that both members come into close contact with each other.
2 is fixed by a double-sided adhesive tape 48. In addition, PD
Since P32 is not transparent, the process of discharging air cannot be observed. However, when a transparent glass plate was pressed against the heat conductive sheet 34, the heat conductive sheet 34 was completely adhered to the glass plate without leaving an air layer. Close contact was confirmed. A PDP 32 is placed on the heat conductive sheet 34.
Even if an air layer remains in the groove-shaped concave portion 42 when pressed and pressed, since it can be almost uniformly contacted with the heat conductive sheet 34 over the entire surface of the PDP 32, the heat conductive sheet 34 and the PDP 32 Compared with the case where the air layer remains, the heat conduction efficiency can be improved and uniform over the entire area of the PDP 32. As described above, in the plasma display device 10 of the present embodiment, the plasma display device 10 is in contact with the PDP 32 of the heat conductive sheet.
A concave and convex portion is formed by a groove-shaped concave portion 42 and a rectangular convex portion 44 on one side to be touched.
Are formed , and air is released by placing the PDP 32 on the surface and pressing it lightly. Therefore, the heat conduction sheet 34 and the PDP 32 can be easily brought into close contact with each other, and the heat conduction efficiency can be made uniform over the entire area of the PDP 32. FIGS. 4 and 5 show modified examples of the shape of the sheet piece 40. FIG. In the example shown in FIG.
Each sheet piece 40a constituting the sheet 34 has a plurality of circular convexes.
The parts 44a are arranged so as to be in contact with each other
The circular convex portion 44a is formed so that the thickness gradually decreases from the central portion toward the peripheral portion. The boundary portion 50 of each circular convex portion 44a and the region 42a having no circular convex portion 44a are concave portions corresponding to the groove-shaped concave portions 42 of the sheet piece 40 , whereby the heat conductive sheet 34
It is configured so that an uneven portion is formed on the contact surface with DP32.
It is. The sheet piece 40a can also be
The same operation and effect as described above can be obtained. In the example shown in FIG. 5, the sheet piece 40b
Is thicker in the central region and gradually thinner toward the periphery. When configuring the heat conductive sheet 34 by arranging the sheet pieces 40b, the central region projections of the sheet piece 40b, becomes near the periphery recess of each sheet piece 40b, thereby thermally conductive sheet 34, the PDP32
An uneven portion is formed on the contact surface of the heat conductive sheet 34, and the same operation and effect as those of the heat conductive sheet 34 including the sheet pieces 40 can be obtained. In the heat conductive sheet 34 described above , an uneven portion is formed on one surface in contact with the PDP 32.
Although the configuration has been described, the configuration may be such that uneven portions are formed on both surfaces. Further, the heat conductive sheet 34 is configured by arranging a plurality of sheet pieces 40, 40a, and 40b. A part may be formed. As described above, in the plasma display device of the present invention, a metal frame chassis and two glass substrates attached to the front of the frame chassis are provided.
An internal unit having a PDP obtained by bonding
And a case made of this internal unit accommodated and front case part and the back case unit, between the frame chassis of the internal unit PDP, a frame
A heat conductive sheet is interposed so as to be in close contact with the chassis and the PDP, a circuit board for driving light emission of the PDP is disposed on the rear side of the frame chassis, and a plurality of ventilation holes are formed on the upper and lower portions of the back case portion. Formed, P
The heat radiation of the DP can be performed efficiently. Also, as in the embodiment , the unevenness is provided on one surface of the heat conductive sheet, the PDP is placed on the surface, and the air is released only by pressing lightly by hand to make the air escape. The PDP and the heat conductive sheet can be easily brought into close contact with each other without leaving a large amount of air layer locally between the heat conductive sheet and the heat transfer efficiency can be made uniform over the entire area of the PDP.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a plasma display device. FIG. 2 is a plan view and a side view showing a sheet piece constituting a heat conductive sheet. FIG. 3 is a diagram illustrating a procedure for assembling a plasma display panel to a frame chassis. FIG. 4 is a plan view and a side view showing a modified example of a sheet piece. FIG. 5 is a plan view and a side view showing another modified example of the sheet piece. [Description of Reference Numerals] 10 Plasma display device 28 Frame chassis 32 Plasma display panel 34 Heat conductive sheet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09F 9/00 304 G09F 9/313 H04N 5/66 101

Claims (1)

(57) [Claim 1] A metal frame chassis and two glass substrates attached to the front of the frame chassis
An internal unit having a plasma display panel obtained by bonding the internal unit and a case containing the internal unit and comprising a front case portion and a back case portion, wherein a frame chassis of the internal unit and the plasma display panel are provided. Between the frame chassis and
A heat conductive sheet was interposed so as to be in close contact with the plasma display panel, a circuit board for driving light emission of the plasma display panel was disposed on the back side of the frame chassis, and a plurality of ventilation holes were formed in the back case portion. Plasma display device.