WO2007023534A1

WO2007023534A1 - Display panel device

Info

Publication number: WO2007023534A1
Application number: PCT/JP2005/015326
Authority: WO
Inventors: Hideaki Yanagita
Original assignee: Fujitsu Hitachi Plasma Display Limited
Priority date: 2005-08-24
Filing date: 2005-08-24
Publication date: 2007-03-01
Also published as: JPWO2007023534A1

Abstract

A display panel device has a display panel having a screen for displaying an image, a support body (4) having a panel support surface (41) greater than the screen, and an adhesive member for adhering the display panel to the panel support surface (41). The support body (4) has a through-hole (45) communicating from a rear surface (42) to the panel support surface (41) and also has a connector section (46) to which piping for delivering pressurized fluid to the through-hole (45) is connected. Gas or liquid can be injected under pressure via the through-hole (45) to the interface between the support body (4) and the adhesive member. The support body (4) and the adhesive member are separated by the injection, and this enables or facilitates removal of the display panel from the support body (4).

Description

Specification

Display panel device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a display panel device including a display panel and a support attached to the back surface thereof, and more particularly to a display panel device in which the display panel can be easily removed.

Background art

[0002] Display panels such as plasma display panels, liquid crystal panels, organic-electrical luminescence, and field emission displays are becoming larger. In particular, plasma display panels that are advantageous for large screens have already achieved a screen with a diagonal of more than 50 inches.

[0003] In assembling a display device including a plasma display panel, the plasma display panel is attached to a metal support and is attached to the housing of the display device in that state. As is widely known, a plasma display panel is a plate-like structure in which two glass substrates with a thickness of several millimeters with electrodes arranged are bonded together, and a support is required to fix them. The support mechanically protects the plasma display panel, and even dissipates warpage and dissipates heat with the power of the screen. Double-sided adhesive tape generally used for pasting has moderate flexibility to absorb the impact force in the thickness direction of the plasma display panel.

[0004] The attachment of the plasma display panel to the support must have sufficient strength to withstand the load. On the other hand, it is also required for pasting that it is easy to reuse the resources that are important in industrial products in recent years. Also, if it is easy to separate the plasma display panel from the support body, it is necessary to manufacture the display device by simply disassembling the used display device. If a defective display is found during the display inspection, the support can be reused without being discarded together with the plasma display panel.

[0005] However, it is not easy to remove the plasma display panel attached with the double-sided adhesive tape from the support. For example, a solvent is soaked around the pasting surface to According to the general method of dissolving the adhesive, it takes more than 30 minutes. In particular, it takes a longer time to carefully remove the plasma display panel without damaging it in order to analyze the cause of failure.

[0006] With regard to facilitating separation of the plasma display panel and the support, there is a prior art that uses a bonding material that has a bonding force that weakens when extended in a direction parallel to the bonding surface. Japanese Patent Application Laid-Open No. 2002-02858577 describes the use of a double-sided adhesive tape in which an adhesive layer is formed on both sides of an elastic film having a breaking elongation of 300% or more. Japanese Patent Application Laid-Open No. 2004-333 904 proposes applying a stretch-peeling adhesive to a pattern composed of a plurality of lines.

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-286577

Patent Document 2: JP 2004-333904 A

Disclosure of the invention

[0007] It is difficult to obtain a display panel device with high reliability by the above prior art characterized by the material of the pasting material. Adhesive materials must meet requirements for joint strength, flexibility, thermal conductivity, durability (aging characteristics), and so on. In addition to these requirements, the prior art requires stretchability to facilitate peeling. At present, there is no material with effective stretchability and sufficient durability.

[0008] An object of the present invention is to facilitate the removal of a display panel which is attached to a support with a material having a special property for peeling.

[0009] A display panel embodying the present invention includes a display panel having a screen for displaying an image, a support having a panel support surface larger than the screen !, and the display panel supporting the display panel. An adhesive member to be attached to the surface, and the support has a through hole that communicates with the back surface of the panel and a connector portion for connecting a pipe that supplies pressurized fluid to the through hole. Is.

[0010] Gas or liquid can be injected into the interface between the support and the adhesive member via the through hole.

The support and the adhesive member are separated by press-fitting, and the display panel is detached from the support or is easily detached. Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a configuration of a display panel device to which the present invention is applied.

FIG. 2 is a cross-sectional view of an essential part showing an example of a connector portion provided in a support body constituting the display panel device.

FIG. 3 is a plan view showing an example of grooves formed on the panel support surface of the support.

FIG. 4 is a plan view showing another example of grooves formed on the panel support surface of the support.

FIG. 5 is a perspective view showing an appearance of a display device assembled with a display panel device.

FIG. 6 is a cross-sectional view showing an internal configuration of the display device.

BEST MODE FOR CARRYING OUT THE INVENTION

In FIG. 1, a display panel device 1 has a plasma display panel 2 having a screen 50 capable of color display, a filter 3 attached to the front surface of the plasma display panel 2, and a through hole 45 unique to the present invention. The support 4 and the adhesive member 5 for attaching the plasma display panel 2 to the panel support surface 41 of the support 4 are configured.

[0013] The planar size of the plasma display panel 2 corresponds to the screen size. For example, if the screen size is 42 inches diagonal (0.92m x 0.52m), the horizontal dimension is about 0.99m and the vertical dimension is about 0.58m.

[0014] The filter 3 is a laminated sheet including an antireflection layer, a dye filter layer, and an electromagnetic wave shielding layer.

[0015] The support body 4 is a box-shaped metal structure that has a rectangular main surface portion that is larger than the screen 50, a side surface portion that is connected to the periphery thereof, and does not have a powerful bottom, and has a thickness of about 1 to 5 mm, for example. It is made by pressing the aluminum plate. The front surface of the main surface portion is flat, and this front surface is the panel support surface 41. A driving circuit board is attached to the back of the main surface part together with a block for reinforcement.

In this example, one through hole 45 is formed at the center of the panel support surface 41. The through hole 45 penetrates through the main surface portion, that is, from the front surface (panel support surface 41) to the back surface of the main surface portion. The size of the practical through hole 45 is 3mn in diameter! ~ About 10mm.

[0017] The adhesive member 5 is one double-sided adhesive sheet or several wide double-sided adhesive tapes arranged in parallel. The adhesive member 5 is used to support the plasma display panel 2 with sufficient strength. And is interposed between the plasma display panel 2 and the support 4 as a shock absorbing layer having a thickness of about 1.5 mm to 2 mm. Acrylic elastomer or silicon elastomer is excellent in thermal conductivity (thermal conductivity 1.3 to 2.3 WZm'K) and is a suitable material for the adhesive member 5.

As shown in FIG. 2, a connector 46 that is suitable for pipe connection for supplying pressurized fluid to the through hole 45 is joined to the back surface 42 of the support 4. The connector 46 is a metal cylinder having an internal thread 46 A on the inner surface, and is disposed concentrically with the penetration height 5. The female screw 46A engages with the male screw 70A at the tip of the one-touch joint 70 that is a piping component. By screwing the joint joint 70 into the connector 46, the pipe 75 can be fixed to the support 4 and the flow path in the pipe can be communicated with the through hole 45. The pipe 75 may be attached to the one-touch joint 70 after the one-touch joint 70 is fixed to the support 4.

The connection of the pipe 75 to the through hole 45 is performed when the display panel device 1 is disassembled, specifically when the plasma display panel 2 and the support 4 are separated. That is, the through hole 45 and the connector 46 are provided for removing the plasma display panel 2. Hereinafter, a method for removing the plasma display panel 2 using the through hole 45 will be described.

[0020] In the completed display panel device 1, the adhesive member 5 is in close contact with the panel support surface (front surface) 41 of the support 4, and the plasma display panel 2 is attached by the adhesive member 5. Talk to you. The through hole 45 is blocked by the adhesive member 5.

In the removal method of this example, an air pressure source is connected to the support 4 in this state via a pipe 75, and the air pressure is stored in the through hole 45. For example, the pressure is about the same as general air blow 0

5 to 0.7 MPa.

[0022] By applying air pressure, the adhesive member 5 is also peeled off by the support 4 in the vicinity of the through hole 45. Then, the peeled area also expands the force near the through hole 45 to the periphery, and the adhesive area gradually decreases. Thereby, the plasma display panel 2 is peeled off or easily peeled off.

FIG. 3 shows a modification of the support.

In the support 4b of FIG. 3, the inflow of compressed air to the interface between the adhesive member 5 and the support 4 In order to speed up the process, a plurality of grooves 47 extending radially from the through hole 45 to the periphery are formed in the panel support surface 41b. The depth of the groove 47 is about 0.3 to 0.5 mm and the width is about lmm. The groove 47 does not reach the peripheral edge of the panel support surface 41b, and the peripheral edge and the groove 47 are separated. This is a consideration to prevent the compressed air flowing from the through hole 45 from leaking outside through the groove 47 before the plasma display panel 2 is completely peeled off. Thereby, the air pressure effectively acts on the separation of the adhesive member 5 and the support 4.

[0025] The removal method described above is a method in which the adhesive member 5 and the support 4 are physically peeled off by internal pressure, but there is also a method that places importance on chemical action. For this purpose, the following support is suitable.

[0026] In the support 4c shown in Fig. 4, three penetrating lashes 45a, 45b, and 45c are arranged at the central portion in the width direction along the length direction, and are pierced through the non-nozzle support surface 41c. A plurality of grooves 48 extending from the 45a, 45b, and 45c forces to the edge are formed. The groove 48 reaches the peripheral edge of the panel support surface 41c. That is, in the state where the adhesive member 5 is adhered, a flow path connecting the through holes 45a, 45b, 45c and the outside is formed by the groove 48. The depth and width of the groove 48 are the same as in the above example.

[0027] On the back surface of the support 4c, connectors 46 shown in Fig. 2 are provided for the through holes 45a, 45b, and 45c, respectively, and in the same manner as in the above example, piping is provided in the through holes 45a, 45b, and 45c. Can be connected.

[0028] When the plasma display panel 2 attached to the support 4c is removed, a predetermined pipe is connected to the support 4c, and heated air or acetone or alcohol is connected to the through holes 45a, 45b, 45c. Then, press the solvent.

[0029] The heated heated air or solvent flows out through the groove 48 to the outside. If the pressurization of the heated air is continued, the adhesive member 5 is heated evenly, and the adhesive force of the entire adhesive member 5 is weakened. Further, due to the press-fitting of the solvent, the adhesive member 5 starts to melt from the vicinity of the groove 48, and eventually the adhesive member 5 dissolves over almost the entire area of the panel support surface 41c.

The above display panel device 1 is incorporated in a display device as shown in FIGS. 5 and 6 and used for displaying an image.

In FIG. 5, the display device 100 is a flat type. Determine the plane size of the display device 100 The decorative cover 101 has an opening larger than the screen 50, and the front surface of the display panel device 1 is exposed except for the peripheral portion.

[0032] As shown in FIG. 6, which is a cross-sectional view taken along the line aa in FIG. 5, in the display device 100, the display panel device 1 is driven in a conductive case (shield housing) 102 to which a decorative cover 101 is attached. Arranged together with the circuit board 90. The conductive case 102 is composed of a frame having an opening slightly larger than the screen and a thin, plate-shaped plate.

Display panel device 1 is fixed by screwing support 4 (chassis) to conductive case 102. A drive circuit board 90 is disposed on the back side of the support 4. Flexible cables 8 and 9 are used for electrical connection between the drive circuit board 90 and the plasma display panel 2. In Fig. 6, the power supply, video signal processing circuit, and audio circuit are omitted.

The plasma display panel 2 includes a front plate 10 and a back plate 20. Both the front plate 10 and the back plate 20 have a glass substrate strength of about 3 mm.

[0035] The front sheet 3 is a flexible laminate in which a functional film 3A having a multilayer structure having a thickness of 0.3 mm and an adhesive layer 3B having a thickness of approximately 0.5 mm are overlaid.

In the above-described embodiment, the configuration of the display panel device 1 can be changed as appropriate in accordance with the spirit of the present invention. The material and shape of the component are not limited to the examples. The size, number, and formation position of the through holes 45, 45 a, 45 b, 45 c may be selected according to specifications such as the screen size and the adhesive force of the adhesive member 5. The connector 46 is not limited to the screw type as long as it fits the piping used. A one-touch power bra may be used. If the support 4 has a sufficient thickness, the connector portion can be formed by processing a part of the support 4. Even if it is a screw hole which penetrates the support body 4, if it engages with piping components, it corresponds to the through hole and connector portion of the present invention. The arrangement pattern, arrangement density, pattern width, and depth of the grooves 47 and 48 of the supports 4b and 4c can be arbitrarily selected. Even when multiple adhesive tapes are applied as adhesive member 5 with an interval of, for example, about 1 cm, the groove is formed so that the injected gas or liquid acts effectively based on the adhesive tape application position. What is necessary is just to form.

Industrial applicability The present invention contributes to the reduction of wastes in the manufacture of display devices and the cost of reusing parts of display devices.

Claims

The scope of the claims

[1] A display panel device comprising: a display panel having a screen for displaying an image; a support having a panel support surface larger than the screen; and an adhesive member for attaching the display panel to the panel support surface. There,

The support body includes a through hole that leads from the back surface to the panel support surface, and a connector portion for connecting a pipe that supplies pressurized fluid to the through hole.

A display panel device characterized by that.

[2] A groove extending toward the periphery of the through hole is formed in the panel support surface.

The display panel device according to claim 1.

[3] A plurality of grooves extending from the through hole to the periphery of the support surface are formed on the support surface.

The display panel device according to claim 1.