JPH10319863A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach/detach a display panel by attaching a display panel to a frame chassis with a screw or an energizing force of a spring to be freely attachable and detachable. SOLUTION: A fixed boss 40 is made adhesion and fixed to a plasma display panel(PDP) 32 by a thermosetting both sides tape. An opening hole is provided at a heat conduction sheet 34 corresponding to the fixed boss 40. Also, a concave part of a conical mount shape is molded or formed by a press process also in a frame chassis 28 corresponding to the fixed boss 40, and a through hole 50 is formed at a bottom face of this concave part. Thereby, when a screw 30 is inserted into the through hole 50 from a back face of the frame chassis through a spring washer and a washer and tightened to a female spring part of the fixed boss 40, the PDP 32 is attached to the frame chassis 28. Also when it is reguired to exchange the PDP 32 afterward, the PDP 32 can be removed from the frame chassis 28 by loosing the screw 30.

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 for mounting a display panel inside a case.

[0002]

2. Description of the Related Art In recent years, a plasma display panel (hereinafter referred to as a PD) has been used as a thin, lightweight image display device having a large screen.
P) is being put to practical use. This PDP device usually includes a frame chassis inside a case, and a PDP formed by bonding two glass substrates is attached to the front of the frame chassis. Until now, as a mounting method, PD with strong double-sided adhesive tape
It was common to fix P to the frame chassis.

[0003] In addition, the PDP is heated to a considerably high temperature due to internal discharge during light emitting display. PDP if you leave this
It is necessary to suppress the temperature to a predetermined temperature or less because it may lead to breakage of the device. As an effective method therefor, as shown in FIG. 10, when the PDP 32 is fixed with the double-sided adhesive tape 2 disposed around the frame chassis 28, the heat conductive sheet 3 is placed between the frame chassis 28 and the PDP 32.
A method has been proposed in which the heat generated in the PDP 32 by the sheet 34 is efficiently conducted to the frame chassis 28 with the sheet 34 interposed therebetween for heat radiation.

[0004]

However, once the PDP is fixed with a strong double-sided adhesive tape, it is extremely difficult to remove the PDP from the frame chassis later. Therefore, even when the PDP needs to be replaced due to a failure or damage at the user's site, a service person or the like cannot replace the PDP alone on the spot, and replaces the PDP with the frame chassis. It is necessary to transport the entire PDP device to the manufacturer, exchange the PDP, and then transport the PDP device again to the user. Further, when the manufacturer removes the PDP from the frame chassis, the frame chassis may be deformed or damaged, so that the frame chassis cannot be reused. Therefore, in any case, there is a problem that the repair cost is high.

Further, as shown in FIG. 10, the PDP 32 is adhesively fixed to the frame chassis 28 in the peripheral area thereof, so that the PDP 32 has a close contact with the heat conductive sheet 34.
There is also a problem that the heat conduction efficiency becomes worse in the central region of the P. 32 and the heat conduction efficiency is lower than that in the peripheral region. Furthermore, when the thickness of the heat conductive sheet 34 is smaller than the thickness of the double-sided adhesive tape 2, the gap formed between the PDP 32 and the heat conductive sheet 34 causes the frame chassis 28 via the heat conductive sheet 34 from the PDP 32. There is a problem that heat conduction to the heat is not performed. On the other hand, when the thickness of the heat conductive sheet 34 is larger than the thickness of the double-sided adhesive tape 2, the PDP 3
2 and the double-sided adhesive tape 2, P
There is a problem that the DP 32 and the frame chassis 28 do not adhere to each other.

[0006]

In order to solve the above-mentioned problems, a video display device according to the present invention is provided with a plurality of fixing members on the back of a display panel, and using the fixing members to connect the display panel to a frame chassis. Fixed detachably by fixing means.

In the image display device of the present invention, the fixing member may be a fixing boss having a female screw portion, and the fixing means may be a screw member screwed into the female screw portion, or conversely, the fixing member may be a fixing member. Is a fixing bolt having a male screw portion, and the fixing means may be a nut member screwed to the male screw portion.

The fixing member has a flange at a portion protruding through the frame chassis, and the fixing means is a spring removably provided between the flange and the rear surface of the frame chassis. The display panel may be fixed to the frame chassis by the urging force of the spring.

Further, a heat conductive sheet may be interposed between the display panel and the frame chassis, and the fixing member may be arranged not only in a peripheral area of the display panel but also in a central area thereof. .

[0010]

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 (video 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 a case 12;
And an internal unit 26 housed in the case 12. A plurality of ventilation holes 18 and 20 are formed in the upper part and the lower part of the front case part 14 in the width direction, respectively, and have a light transmitting part 22 made of glass or the like on the front surface. Also, 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 has an aluminum frame chassis 28 and a plurality of screws 30 (fixing means) mounted on the front of the frame chassis 28.
DP (display panel) 32, frame chassis 28 and P
It comprises a heat conductive sheet 34 made of silicone or the like interposed between the DP 32 and a plurality of circuit boards 36 supported on the back of the frame chassis 28. Thermal conductive sheet 34
Is for efficiently transferring the heat of the PDP 32 to the frame chassis 28. The circuit board 36 is a PDP
32, and controls the light emission of 32.

The PDP 32 has a front plate and a back plate, and although not shown in the drawing, the front plate is longer in the long side direction and shorter in the short side direction than the back plate. Therefore, the front plate and the rear plate each have a portion that does not overlap each other, and a terminal connected to an electrode in the PDP 32 is formed in the non-overlapping portion (not shown). A plurality of film-like wirings (not shown) having a male connector at the end 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 circuit board, each circuit board 36 and PDP
32 are electrically connected.

As shown in FIGS. 1 and 2, a plurality of fixing bosses (fixing members) 40 are provided on the back surface of the PDP 32. In the present embodiment, five fixed bosses 40 are arranged in the peripheral area and the central area of the PDP 32. However, it is confirmed by a drop impact test that if the number of the installed bosses is at least three or more, they can withstand the strength. For example, as shown in FIG.
Twelve fixed bosses 40 may be arranged in the peripheral area and central area of the PDP 32. In addition, as described later, the PDP 32
The fixing bosses 40 are preferably arranged evenly with respect to the PDP 32 in order to bring the heat conductive sheet 34 and the heat conductive sheet 34 into close contact with each other.

The shape of the fixed boss 40 is shown in FIGS.
As shown in (c), various shapes are conceivable.
The fixing boss 40 is formed by molding or cutting using a metal or a synthetic resin, and has a female screw portion 42 at the center thereof. As shown in FIG. 5, the PDP 32 is screwed and fixed to the frame chassis 28 using the female screw portion 42 with the screw 30.

The fixing boss 40 is bonded and fixed to the PDP 32 by a thermosetting double-sided tape 44. Thermal conductive sheet 3
4 has an opening 46 corresponding to the fixing boss 40. In the frame chassis 28, a truncated cone-shaped concave portion 48 corresponding to the fixed boss 40 is formed by molding or pressing. The bottom of the recess 48 has a through hole 5
0 is formed. Thereby, the frame chassis 2
The screw 30 is inserted into the through hole 50 from the back surface of the fixing boss 4 through the spring washer 52 and the washer 54 so as to fix the boss 4.
When the PDP 32 is tightened to the female screw portion 42 of the PDP 32, the PDP 32 is attached to the frame chassis 28. Also, later PDP3
When replacement of the PDP 32 becomes necessary, the PDP 32 can be removed from the frame chassis 28 by loosening the screw 30.

As described above, in the plasma display device 10 of the present embodiment, the PDP 32 is
8 because it is detachably mounted by screwing.
The attachment and detachment of the DP 32 can be easily performed. Therefore, when it is necessary to replace the PDP 32 at the user's site, a service person or the like can replace the PDP device on the spot without sending back the entire PDP device to the manufacturer, so that the labor, time and cost required for repair can be greatly reduced, and Maintenance and serviceability during replacement are improved. Also, at the time of assembling, the labor of attaching a double-sided adhesive tape for fixing the PDP 32 as in the related art can be omitted, so that the assembling process can be simplified.

Further, the PDP 32 is connected to the frame chassis 2
8, when the screws 30 are tightened with the same torque, the fixing bosses 40 are evenly arranged in the peripheral area and the central area of the PDP 32. The heat conduction efficiency is P
It can be made uniform over the entire area of the DP 32.

The fixed boss 40 having the female screw portion 42
Instead, as shown in FIG. 6, a fixing bolt 60 having a male screw portion 62 may be adhered to the PDP 32 and fixed with a nut 64.

Next, another mounting method of the PDP 32 will be described with reference to FIGS. FIG. 7 shows a structure in which the PDP 32 is attached to the frame chassis 28 using a helical spring 70. In this mounting method, the tip of the fixed boss 40 protrudes through the frame chassis 28 through the opening 50. A screw 72 having a flange 74 with a larger diameter than the fixed boss 40 is screwed into the female screw portion 42 of the fixed boss 40. Around the fixed boss 40 and the flange 7
A helical spring 70 is provided between the frame spring 4 and the rear surface 29 of the frame chassis 28, and the PDP 32 is fixedly held on the frame chassis 28 by the urging force of the helical spring 70. In this case, by loosening and removing the screw 72, the spring 70 can be attached and detached around the fixed boss 40, and P
The DP 32 can be easily removed from the frame chassis 28.

FIG. 8 shows a PDP 3 using a leaf spring 80.
2 shows an attachment structure. Fixed boss 4 on the back of PDP32
0, a fixing pin 8 having a flange portion 82 at the tip.
4 is fixed. The flange portion 82 of the fixing pin 84 protrudes through the frame chassis 28 through the opening 50. A leaf spring 80 is provided between the flange portion 82 of the fixing pin 84 and the back surface 29 of the frame chassis 28. As shown in FIG. 9, the leaf spring 80 is formed by, for example, bending a metal plate into a U-shape, and has a notch 81 formed from the edge to the center. By attaching the cylindrical portion 86 of the fixing pin 84 to the notch portion 81 so as to be inserted, the urging force of the leaf spring 80 acting between the flange portion 82 of the fixing pin 84 and the frame chassis 28 causes the PD
P32 is fixedly held by the frame chassis 28. In this case, the PDP 32 can be easily removed from the frame chassis 28 by pulling out the leaf spring 80 from the fixing pin 84.

As described above, the PDP 32 is connected to the frame chassis 28 using the spring members such as the helical spring 70 and the leaf spring 80.
When the PDP 32 is fixed to the frame chassis 28, the PDP 32 can be easily attached to and detached from the frame chassis 28, and the PDP 32 with respect to the frame chassis 28 can be
2 can be arbitrarily set.

According to the plasma display device described in the above embodiment, P
Since the DP and the heat conductive sheet and the heat conductive sheet and the frame chassis are securely adhered to each other, the heat generated from the PDP is reliably radiated from the back of the frame chassis through the heat conductive sheet, and the temperature rise of the PDP is suppressed. PD
The reliability against breakage of P is improved.

In the above embodiment, the description has been given of the plasma display device having the heat conductive sheet. However, the present invention can be applied to the plasma display device having no heat conductive sheet.

[0024]

According to the video display device of the present invention, the display panel can be easily attached and detached because the display panel is attached to the frame chassis by screws or by the biasing force of a detachable spring. Maintenance during replacement,
The serviceability is improved, and the frame chassis can be reused. Also, at the time of assembling the apparatus, the labor for attaching a double-sided adhesive tape can be omitted, and the assembling process can be simplified.

Further, when the fixing member is provided also in the central region of the display panel and a heat conductive sheet is interposed between the display panel and the frame chassis, a screw member as fixing means corresponding to the fixing member in the central region. Alternatively, by tightening a nut member or using a spring member having a large elastic modulus, it is possible to improve the adhesion to the heat conductive sheet in the central region of the display panel, and to make the heat conduction efficiency uniform over the entire area of the display panel. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a plasma display device.

FIG. 2 is a rear view of a frame chassis provided with five fixing bosses.

FIG. 3 is a rear view of a frame chassis provided with twelve fixing bosses.

FIGS. 4A to 4C are diagrams showing types of shapes of fixed bosses.

FIG. 5 is a partial cross-sectional view near a fixing boss when the PDP is mounted on a frame chassis.

FIG. 6 is a partial cross-sectional view showing a modification in which a fixing bolt is used instead of the fixing boss.

FIG. 7 is a partial cross-sectional view showing a PDP mounting structure using a helical spring.

FIG. 8 is a partial sectional view showing a PDP mounting structure using a leaf spring.

FIG. 9 is a plan view and a side view of a leaf spring.

FIG. 10 is a diagram showing a conventional method of fixing a PDP to a frame chassis.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Plasma display apparatus, 28 ... Frame chassis, 32 ... Plasma display panel (display panel), 30 ... Screw (fixing means), 34 ... Heat conductive sheet,
40: fixed boss (fixed member), 70: helical spring, 80:
Leaf spring, 84: fixing pin (fixing member).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Kojima 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. An image display device comprising: a plurality of fixing members provided on a back surface of a display panel; and the display panel is removably fixed to a frame chassis using the fixing members by fixing means. 2. The image display device according to claim 1, wherein the fixing member is a fixing boss having a female screw portion, and the fixing means is a screw member screwed into the female screw portion. 3. The image display device according to claim 1, wherein the fixing member is a fixing bolt having a male screw portion, and the fixing means is a nut member screwed into the male screw portion. 4. The fixing member has a flange portion at a portion protruding through the frame chassis, and the fixing means is a spring detachably provided between the flange portion and a rear surface of the frame chassis. The image display device according to claim 1, wherein the display panel is fixed to the frame chassis by a biasing force of the spring. 5. The image display device according to claim 1, wherein a heat conductive sheet is provided between the display panel and the frame chassis. 6. The image display device according to claim 1, wherein the fixing member is arranged not only in a peripheral region of the display panel but also in a central region thereof.