JP2008040412A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device which improves the impact resistance of a front glass substrate, without having to increase the thickness of the glass substrate. <P>SOLUTION: The image display device is equipped with a plasma display panel 10 arranged opposite to a front plate 11 and a back plate 12, and forms the surface on the front plate 11 side as the image display surface. The front plate 11 is formed to a projecting shape on the image display surface side so that, even if impact is applied to the glass substrate of the front plate 11 formed into a projection shape, generation of cracks in the plasma display panel 10 can be suppressed, by reducing the tensile stress generated in the glass substrate of the back plate 12 due to the impact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display apparatus using a plasma display panel known as a display device.

  In recent years, expectations for large screens and wall-mounted televisions have increased as interactive information terminals, and there are a number of display devices such as liquid crystal display panels, field emission displays, and electroluminescence displays. Among these display devices, a plasma display panel (hereinafter referred to as “PDP”) is a self-luminous, beautiful image display, and a thin display device with excellent visibility because it can be easily enlarged. Development for high definition and large screen is underway.

  In the PDP, a front plate and a back plate on which components such as an electrode, a dielectric layer, a partition wall, a phosphor layer, and a protective layer made of MgO are respectively formed are opposed to each other so as to form a minute discharge space. The periphery is sealed with a sealing member. A discharge gas obtained by mixing neon (Ne), xenon (Xe), or the like is sealed in the discharge space at a pressure of, for example, about 66500 Pa (about 500 Torr).

  The front plate and the back plate are obtained by forming the above-described components on a front substrate and a rear substrate, which are glass substrates, respectively. These front side substrates and back side substrates are made thinner in order to make them lighter, but the front side substrates are particularly easily damaged by direct impact of objects or impacts during transportation. This is because the rear substrate is affixed to an aluminum chassis, so external impacts are not directly applied to the rear substrate. This is because a direct hit may be received.

To solve such a problem, a method for improving the strength of the front plate substrate while keeping the thickness and weight of the total glass substrate equal by thinning the back substrate and increasing the thickness of the front substrate accordingly is disclosed. (For example, refer to Patent Document 1).
JP 2002-134040 A

  However, in order to achieve both weight reduction of the PDP and improvement of the strength of the glass substrate, it is necessary to improve the strength without increasing the thickness of the glass substrate. However, a method for improving the strength of a glass substrate using a method for producing tempered glass such as a chemical tempering method or a physical tempering method has a problem that the cost of the glass substrate itself increases.

  The present invention has been made in view of such a situation, and an object thereof is to provide an image display device in which the impact resistance of a front glass substrate is improved without increasing the thickness of the glass substrate.

  In order to achieve the above object, an image display device of the present invention is an image display device that includes a PDP in which a front plate and a back plate are arranged to face each other, and has a front plate side surface as an image display surface. The face plate has a convex shape on the image display surface side.

  According to such a configuration, even if an impact is applied to the glass substrate of the convex front plate, it is possible to suppress the occurrence of cracks in the glass substrate by reducing the tensile stress generated in the rear glass substrate due to the impact. it can.

  In addition, a holding member for holding the PDP on the back plate side is preferably provided, and the holding member is preferably convex on the image display surface side, and the front plate is convex along the holding member to break the glass substrate of the front plate. Can be suppressed.

  Further, the holding member includes a metal chassis member, and it is desirable that the chassis member has a convex shape on the display surface side, and the convex chassis member can be easily realized by molding aluminum or the like. Breaking of the substrate can be suppressed.

  Further, the holding member includes a heat conductive sheet, and it is desirable that the heat conductive sheet has a convex shape on the display surface side, and improves the heat dissipation characteristics of the PDP by improving the contact property of the heat conductive sheet with the PDP. The convex shape of the glass substrate of the face plate can be reliably realized.

  Further, the holding member is provided with an adhesive sheet, and the adhesive sheet is preferably convex on the display surface side, and the adhesiveness between the PDP and the holding member is improved to reliably realize the convex shape of the glass substrate of the front plate. be able to.

  According to the image display device of the present invention, the impact resistance of the front glass substrate can be improved by a simple method without increasing the thickness of the glass substrate or using tempered glass, and a highly reliable PDP is provided. An image display device can be realized.

  Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional perspective view showing a schematic configuration of a PDP used in the image display apparatus according to the first embodiment of the present invention, and FIG. 2 is a plan view showing a schematic configuration of an image display unit of the PDP. As shown in FIG. 1, the PDP 10 includes a front plate 11 and a back plate 12.

  The front plate 11 has a stripe-like shape in which a scanning electrode 14 and a sustain electrode 15 are paired as a PDP component on a transparent front glass substrate 13 made of sodium borosilicate glass or the like formed by a float process. A display electrode 16 is formed. Further, for the purpose of improving the contrast, the black stripe 17 and the dielectric layer 18 are formed so as to cover the black stripe 17 and the display electrode 16 group. Further, a protective layer 19 of MgO is formed so as to cover the dielectric layer 18.

  Scan electrode 14 and sustain electrode 15 are each composed of transparent electrodes 14a and 15a and bus electrodes 14b and 15b made of Cr / Cu / Cr or Ag or the like electrically connected to transparent electrodes 14a and 15a. ing.

  The back plate 12 has an address electrode 21 formed in a direction orthogonal to the display electrode 16 of the front plate 11 on the back glass substrate 20 disposed opposite to the front glass substrate 13, and a lower surface covering the address electrode 21. A base dielectric layer 22 that is a ground layer is formed. Further, on the back plate 12, for example, stripe-shaped barrier ribs 23 on the base dielectric layer 22, and phosphor layers 24 formed on the side surfaces between the barrier ribs 23 and the surface of the base dielectric layer 22 are formed. For the color display, the phosphor layer 24 is usually arranged in order of three colors: a red phosphor layer 24a, a green phosphor layer 24b, and a blue phosphor layer 24c.

  The front plate 11 and the back plate 12 are arranged opposite to each other with the partition wall 23 interposed therebetween so that the display electrode 16 and the address electrode 21 are orthogonal to each other and form a minute internal space therein, and the periphery is a sealing member. It is sealed by. A PDP 10 is configured by sealing a discharge gas obtained by mixing neon (Ne), xenon (Xe), or the like in the internal space at a pressure of about 66500 Pa (500 Torr). In FIG. 1, the front plate 11 and the back plate 12 are shown apart from each other so that the internal configuration can be easily understood. However, the front plate 11 and the back plate 12 actually face each other with the partition wall 23 interposed therebetween. Has been placed. FIG. 1 shows a state in which the back plate 12 and the front plate 11 are placed on a horizontal plane, but the front side glass substrate 13 and the back side glass substrate 20 are at their respective ends with respect to the horizontal reference line 28. The central part is lifted from the part.

  Further, as shown in FIG. 2, the scan electrodes 14 and the sustain electrodes 15 are alternately arranged in the column direction so as to be adjacent to each other in the matrix display with the discharge gap 25 interposed therebetween. Here, a portion that is partitioned by the partition wall 23 in the internal space of the PDP 10 and that is orthogonal to the display electrode 16 and the address electrode 21 functions as a discharge cell 26 that is a unit light emitting region. A black stripe 17 is formed in the non-light emitting region 27.

  Then, a discharge is generated by a periodic voltage applied to the address electrode 21 and the display electrode 16, and the phosphor layer 24 is irradiated with ultraviolet rays by the discharge to convert it into visible light, thereby performing image display.

  FIG. 3A is an exploded perspective view showing the main part of the image display device using the PDP in the first embodiment of the present invention, and FIG. 3B is a front view of the main part of the image display device. . As shown in FIG. 3B, in a state where the image display device is assembled, the PDP 10 is configured such that the surface on the front plate 11 side is an image display surface, and the front plate 11 has a convex shape on the image display surface side. is doing.

  As shown in FIG. 3A, the image display apparatus is roughly a PDP 10 comprising a chassis member 30 as a holding member for holding the PDP from the back plate side, and a front plate 11 and a back plate 12 held thereon. And a front frame 31 provided on the front plate 11 side. The chassis member 30 is provided with a drive circuit (not shown) for driving the PDP 10. On the other hand, the front frame 31 is equipped with a filter (not shown) for reducing reflection on the display surface and increasing impact resistance.

  In the image display apparatus according to the first embodiment of the present invention, the chassis member 30 has a convex shape, so that the entire PDP 10 has a convex shape on the display surface side. That is, the chassis member 30 is a holding plate that holds the PDP 10 and fixes the PDP 10 with the front frame 31. The chassis member 30 is formed by molding or the like using, for example, an aluminum plate having good thermal conductivity so as to have a function as a heat radiating plate for radiating heat of the PDP 10. Therefore, as shown in FIG. 3 (a), the chassis member 30 itself is formed into a shape having a convex central portion by molding, the PDP 10 is aligned with the shape, and the front frame 31 and the chassis member 30 are screwed together. As shown in FIG. 3B, it is possible to realize an image display device in which the display surface side on the front plate 11 side of the PDP 10 has a convex shape.

  Next, the reason why the strength against impact increases when the glass substrate has such a convex shape will be described. FIG. 4 is a diagram illustrating an example of a situation in which the glass substrate breaks when an impact is applied to the glass substrate. As a fracture mechanism when an impact is applied to a glass substrate, two types of bending fracture mode and Hertz fracture mode are common. The Hertz break mode is a mode that occurs when the impact speed is high, such as a pistol bullet, and the impact area is small, and the breakage of the glass substrate of a general image display device is a bending break mode. It is believed that there is.

  FIG. 4 shows a case where both ends of the glass substrate 32 are supported. As shown in FIG. 4, when an impact 33 is applied to the glass substrate 32, the central portion of the glass substrate 32 bends downward in the drawing, and a large tensile stress is applied to the lower surface 34 of the glass substrate opposite to the surface to which the impact 33 is applied. 35 is produced. And when this tensile stress 35 exceeds the compressive stress inside a glass substrate, the crack 36 will generate | occur | produce. This phenomenon confirms that cracks are generated from the surface of the glass substrate on which the holding member abuts even when the holding member holds the surface opposite to the surface to which the impact is applied.

  That is, in the present invention, the main purpose is to reduce the tensile stress generated on the surface opposite to the surface to which the impact is applied. By making the surface to which the impact is applied convex and making the opposite surface concave, the compressive stress is applied to the opposite surface, reducing the generation of tensile stress applied by the impact. is there.

  2. Description of the Related Art In recent years, an image display device using a PDP has been accelerated to reduce the thickness of a glass substrate constituting the PDP in order to reduce the weight, and such a glass substrate is easily cracked due to bending or the like.

  As described above, by forming the chassis member, which is a holding member that holds the back plate side of the PDP, into a convex shape on the display surface side, the tensile stress generated by the impact can be reduced and the PDP with improved impact resistance can be obtained. A highly reliable image display apparatus can be realized.

(Second Embodiment)
In the second embodiment of the present invention, different methods for forming the front glass substrate 13 and the rear glass substrate 20 of the PDP 10 in a convex shape on the image display surface side will be described.

  FIG. 5A is an exploded perspective view showing the main part of the image display device using the PDP in the second embodiment of the present invention, and FIG. 5B is a front view of the main part of the image display device. . As shown in FIG. 5B, when the image display device is assembled, the PDP 10 is configured such that the surface on the front plate 11 side is an image display surface, and the front plate 11 is convex on the image display surface side. Has been.

  The difference between the second embodiment of the present invention and the first embodiment of the present invention is that a heat conductive sheet 40 that promotes heat dissipation of the PDP 10 is sandwiched between the chassis member 30 and the PDP 10. Is a point. And as shown in FIG. 5, the heat conductive sheet 40 is thickened from the peripheral part on the side in contact with the back plate 12 to the central part. In the embodiment of the present invention, the chassis member 30 is formed of a flat plate.

  The PDP 10 is configured to have a convex shape on the display surface side of the front plate 11 by attaching the heat conductive sheet 40 to the flat chassis member 30, placing the PDP 10 thereon, and fixing the PDP 10 with the front frame 31. Can do.

  As such a heat conductive sheet 40, it is possible to use an insulating heat radiation sheet, a graphite sheet, a metal sheet, or the like in which a synthetic resin material such as acrylic, urethane, silicone resin, or rubber contains a filler that enhances heat conductivity. it can. Therefore, since the heat conductive sheet 50 can be easily processed by molding or the like, such a shape can be easily realized.

  Thus, the thermal conductive sheet 40 constituting the holding member realizes a reduction in tensile stress generated on the surface opposite to the surface to which the impact is applied. For this reason, the surface to which the impact is applied is convex and the opposite surface is concave, so that compressive stress is applied to the opposite surface to reduce the generation of tensile stress applied by the impact. Thus, the glass substrate can be prevented from cracking.

  In addition, in embodiment of this invention, although the thickness of the heat conductive sheet demonstrated the case where it formed thickly toward a center part from a peripheral part, it is good also considering a pressure sensitive adhesive sheet as the above-mentioned shape instead of a heat conductive sheet. That is, the same effect can be obtained even if the pressure-sensitive adhesive sheet in which the heat conductive sheet is bonded to the chassis or the pressure-sensitive adhesive sheet in which the PDP and the heat conductive sheet are bonded together has the above-described shape.

  In addition, when the strength is important as the convex shape, it is desirable to have a lens shape as shown in FIG. 3 or FIG. It may be configured such that it is curved toward the short side to have a convex shape.

  According to the image display device of the present invention, it is possible to realize a highly reliable image display device with improved impact resistance by suppressing cracking due to an impact on the image display surface, in particular, a large-screen liquid crystal display device or It is useful for a PDP display device.

1 is a cross-sectional perspective view showing a schematic configuration of a PDP used in an image display device according to a first embodiment of the present invention. The top view which shows schematic structure of the image display part of the PDP (A) The disassembled perspective view which shows the principal part of the image display apparatus using PDP in the 1st Embodiment of this invention, (b) is a front view of the principal part of the image display apparatus The figure which shows an example of the situation where a glass substrate breaks when an impact is applied to a glass substrate (A) The disassembled perspective view which shows the principal part of the image display apparatus using PDP in the 2nd Embodiment of this invention, (b) is a front view of the principal part of the image display apparatus

Explanation of symbols

10 PDP
DESCRIPTION OF SYMBOLS 11 Front plate 12 Back plate 13 Front glass substrate 14 Scan electrode 14a, 15a Transparent electrode 14b, 15b Bus electrode 15 Sustain electrode 16 Display electrode 17 Black stripe 18 Dielectric layer 19 Protective layer 20 Back glass substrate 21 Address electrode 22 Base dielectric Layer 23 Partition 24 Phosphor layer 24a Red phosphor layer 24b Green phosphor layer 24c Blue phosphor layer 25 Discharge gap 26 Discharge cell 27 Non-light emitting region 28 Horizontal reference line 30 Chassis member 31 Front frame 32 Glass substrate 33 Impact 34 Glass substrate Lower surface 35 Tensile stress 36 Crack 40 Heat conduction sheet

Claims (5)

An image display device comprising a plasma display panel in which a front plate and a back plate are arranged to face each other, wherein the front plate side surface is an image display surface, and the front plate has a convex shape on the image display surface side An image display device characterized by the above. The image display apparatus according to claim 1, further comprising a holding member that holds the plasma display panel on the back plate side, wherein the holding member has a convex shape on the image display surface side. The image display device according to claim 2, wherein the holding member includes a metal chassis member, and the chassis member has a convex shape on the display surface side. The image display apparatus according to claim 2, wherein the holding member includes a heat conductive sheet, and the heat conductive sheet has a convex shape on the display surface side. The image display device according to claim 2, wherein the holding member includes an adhesive sheet, and the adhesive sheet has a convex shape on the display surface side.

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