WO2008020481A1

WO2008020481A1 - Display apparatus, plasma display apparatus and method of filter detachment

Info

Publication number: WO2008020481A1
Application number: PCT/JP2006/316244
Authority: WO
Inventors: Nobuyuki Hori; Yoshimi Kawanami
Original assignee: Hitachi Plasma Display Limited
Priority date: 2006-08-18
Filing date: 2006-08-18
Publication date: 2008-02-21
Also published as: JPWO2008020481A1

Abstract

A display apparatus comprising a film filter provided with a functional film, the functional film composed of a transparent resin base material and, superimposed on one major surface thereof, a filter layer, and a pressure sensitive adhesive layer, and comprising a display panel having the film filter attached to the front face thereof by means of the pressure sensitive adhesive layer, wherein the thickness of the functional film of the film filter on the surface bonded to the display panel is 1.1 or more times that of the pressure sensitive adhesive layer, and wherein the thickness of the pressure sensitive adhesive layer is 50 μm or more, so that a cut line for facilitating detachment without flawing of the display panel can be made on the film filter. Thus, without damaging of the display panel, the efficiency of detachment operation can be enhanced.

Description

Specification

Display device, plasma display device, and filter peeling method

Technical field

TECHNICAL FIELD [0001] The present invention relates to a display device, a plasma display device, and a filter peeling method, and more particularly, to a display device having a film filter attached thereto and a method for removing the attached film filter.

Background art

[0002] Technological development of flat display panels such as plasma display panels (PDPs) is progressing in the direction of increasing the screen size in order to provide more powerful image display. One of the major challenges in increasing the screen size is light weight.

[0003] In general, a display device (plasma display device) including a PDP includes a plate filter using a tempered glass as a support. This plate-like filter is disposed on the front side of the PDP and is provided away from the PDP. The plate filter mechanically protects the PDP along with various functions related to display operations such as optical adjustment of display color, antireflection of external light, shielding of electromagnetic waves emitted from the PDP, and shielding of near infrared rays. It has a function.

[0004] In order to reduce the weight of plasma display devices, instead of assembling plate filters, a film filter (film filter) with a resin film as a support is directly attached to the front glass of the PDP. Has been proposed. For example, Japanese Patent Laid-Open No. 2001-343898 describes a film filter comprising a transparent conductive film for reducing electromagnetic wave radiation noise, an antireflection film attached to the front side thereof, and a cover.

[0005] In a plasma display device in which the film filter is directly attached to the front glass of the PDP, air bubbles are trapped between the PDP and the film filter in the shelling process, and carelessness after attachment If the filter is damaged by, the film filter needs to be replaced. There has been proposed a filter that easily removes the panel force when the film filter is replaced. For example, Japanese Unexamined Patent Application Publication No. 2004-311664 describes a PDP direct pasting filter in which the peel strength of the PDP from the front glass is 10 NZ20 mm or less. [0006] However, if the peel force is small, the film filter may be peeled off naturally due to changes in the usage environment of the plasma display device, etc., so that the film filter requires a certain degree of adhesive strength. For PDPs that are becoming larger, the peel force that takes into account their size is important.

[0007] Generally, the screen size of a PDP is 32 inches or more diagonally, and the width of the corresponding film filter is 400 mm or more. Therefore, if the peel force is 10NZ20mm, the actual peel force when peeling the film filter may be 200N or more, which requires a very large force and the workability is poor. Furthermore, the peeling reaction may cause excessive stress on the panel, destroying the internal structure of the panel or damaging the panel itself. In the future, considering the further thinness and lightness of the plasma display device (thinning the panel and the base chassis that supports it), the risk is even greater.

[0008] Japanese Patent Application Laid-Open No. 2004-134285 describes a method of cutting a film into a strip shape in advance when the film is peeled from the display device, and reducing the peeled area at a time. Yes. However, the method described in Japanese Patent Application Laid-Open No. 2004-134285 does not take into consideration that the panel may be damaged when the film is cut.

Patent Document 1: Japanese Patent Laid-Open No. 2001-343898

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-311664

Patent Document 3: Japanese Patent Application Laid-Open No. 2004-134285

Disclosure of the invention

An object of the present invention is to provide a display device that can easily peel off an attached film filter without damaging the display panel. Another object of the present invention is to enable easy and reliable peeling of the attached film filter without damaging the display panel.

[0011] The display device of the present invention includes a display panel that displays an image, a functional film including a transparent resin base material, and a filter layer laminated on one surface side of the transparent resin base material, and an adhesive layer. And a film filter in which the functional film is attached to the front surface of the display panel via the adhesive layer, and the film filter has a thickness of the functional film described above. It is characterized in that it is 1.1 times the thickness of the adhesive layer and the thickness of the adhesive layer is 50 m or more.

According to the present invention, the thickness of the adhesive layer of the film filter on the surface to be attached to the display panel is 50 m or more and less than 1.1 times the thickness of the functional film, so that the display panel is damaged. Therefore, a cut for facilitating peeling can be put in the film filter, and workability related to peeling can be improved.

[0012] Further, the filter peeling method of the present invention is a film filter in which a functional film composed of a transparent resin base material and a filter layer is attached to the front surface of a display panel for displaying an image via an adhesive layer. In the peeling method, the adhesive layer of the film filter can be cut along the cut surface by cutting the functional film, and at least the transparent resin substrate of the functional film is cut completely. A cut having a depth reaching the adhesive layer and not reaching the display panel is put in the film filter, and the film filter is peeled off the display panel along the cut.

According to the present invention, the force required to peel off the film filter attached to the front surface of the display panel can be reduced and the peeling work can be efficiently performed, and the load applied to the display panel due to the reaction caused by the peeling is suppressed. It is possible to prevent the display panel from being damaged.

Brief Description of Drawings

FIG. 1 is a cross-sectional view schematically showing a configuration example of a display device according to an embodiment of the present invention.

FIG. 2A is a diagram for explaining a method of cutting a film filter.

FIG. 2B is a diagram showing peeling of the film filter from the display panel.

FIG. 3 is a diagram showing the filter surface flatness according to the thickness of the transparent resin base material and the thickness of the adhesive layer.

FIG. 4A is a cross-sectional view showing a specific example of a film filter in the present embodiment.

FIG. 4B is a cross-sectional view showing another specific example of the film filter in the present embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating a configuration example of a display device according to an embodiment of the present invention. FIG. 1 schematically shows a cross section of the display device according to the present embodiment. In FIG. 1, 1 is a functional film, 2 is an adhesive (transparent adhesive) layer (hereinafter referred to as an adhesive layer), and 3 is a front glass of the display panel. A functional film 1 and an adhesive layer 2 constitute a film filter, which is attached to the front glass 3 of the display panel. Specifically, the functional film 1 is attached to the front glass 3 of the display panel via the adhesive layer 2.

[0015] The functional film 1 includes, for example, an optical property adjustment film for optical adjustment of display color, an antireflection film for preventing reflection of external light, and a display panel force for blocking electromagnetic waves emitted. These include electromagnetic wave shielding films and near infrared ray shielding films for shielding near infrared rays emitted from display panels (particularly PDP).

[0016] The functional film 1 has a transparent resin base material 4 and a filter layer 5 laminated on one surface side thereof. For example, a PET (polyethylene terephthalate) film is used as the transparent resin substrate 4, and a characteristic adjusting film, an antireflection film, a conductive layer, a near-infrared blocking layer, etc. according to the function realized by the functional film 1 are provided on one side thereof. The filter layer 5 is formed.

[0017] The adhesive layer 2 is for attaching the functional film 1 to the front glass 3 of the display panel. Adhesive layer 2 is made of acrylic resin as the main material, and its hardness is adjusted so that it is cut along the cut surface of functional film 1 even if it is not cut completely. It is. That is, at least the functional film 1 is completely cut, so that the functional film 1 and the adhesive layer 2 immediately below the functional film 1 can be peeled along the cut surface.

Here, the display panel in the present embodiment is a plasma display panel (PDP). In this PDP, although not shown in FIG. 1, a plurality of X electrodes (sustain electrodes) are alternately and in parallel. ) And a plurality of Y electrodes (scanning electrodes) are disposed on the front glass substrate 3, and address electrodes, ribs for partitioning display cells, and phosphors are disposed on the rear glass substrate facing the front glass substrate 3. Ne + Xe-paying gas, etc. is sealed between the front glass substrate and the back glass substrate. X electrode, Y electrode and address electrode are arranged so as to be orthogonal Each display cell corresponding to a pixel is formed by the intersection of the Y electrode and the address electrode and the corresponding X electrode adjacent thereto. Then, by selectively generating a discharge in the display cell, the phosphor provided in the display cell is excited to emit light, and an image is displayed.

[0019] In the present embodiment, in the film filter composed of the functional film 1 and the adhesive layer 2, the thickness of the adhesive layer 2 is 50 m or more, and the thickness of the functional film 1 is that of the adhesive layer 2. 1. More than 1 times the thickness. Hereinafter, the thicknesses of the functional film 1 and the adhesive layer 2 in the film filter of this embodiment will be described.

[0020] First, the thickness of the adhesive layer 2 will be described.

Prepare a film filter with a transparent moonlight base material thickness of 100 m and adhesive layer thickness of 25, 50, 100, 250 m, and evaluate it for damage to the panel surface caused by cutting the film filter. Went.

[0021] The cross-sectional structure of the film filter has the same outer shape in the order of the separator, the adhesive layer, and the functional film on the display panel side. For convenience, the functional film has only a transparent resin base and is not provided with a filter layer. In addition, the adhesive layer is mainly made of an acrylic resin as described above, and the adhesive layer itself is completely cut! At least, the adhesive layer is hard so that it is cut along the cut surface of the functional film. Is adjusted.

[0022] Each film filter force The separator is peeled off and bonded to a glass substrate having a thickness of about 3 mm, and as shown in FIG. 2A, a functional film of the film filter (transparent using a cutter having a depth adjusting function) The cut was made so that the resin base was completely cut. However, considering the thickness accuracy (about ± 10 m) of the transparent resin substrate in the film filter and the depth accuracy of the cutter blade, the depth of the cutter blade (thickness of the transparent resin substrate) + 20 m).

[0023] FIG. 2A is a diagram for explaining a method of cutting a film filter. In FIG. 2A, 11 is a functional film (transparent resin base material), 12 is an adhesive layer, 13 is a glass substrate, and 14 is a cutter having a depth adjusting function. Adjust the depth of the blade 16 and fix it with the stopper 15 and move the cutter 14 using the guide 17 to make a cut with a predetermined depth in the film filter consisting of the functional film 11 and the adhesive layer 12 . [0024] After making a cut in the film filter, the film filter was peeled off from the glass substrate 13 along the cut as shown in Fig. 2B. As a result, the adhesive layer was also cut along the cut surface, and the functional film (transparent film) (Fat base material) 11 and adhesive layer 12 were peeled cleanly. FIG. 2B is a diagram showing how the film filter is peeled off. In FIG. 2B, D indicates the depth of the cutter blade (depth of the cut surface), and 21 indicates the cut surface.

After removing all the film filters, the surface of the glass substrate was observed and evaluated for damage to the panel surface. Table 1 below shows damage to the panel surface against the thickness of the adhesive layer!

[0026] [Table 1]

[0027] As shown in Table 1, when the thickness of the adhesive layer in the film filter was 25 μm, the surface of the glass substrate was damaged and the panel surface was damaged, but the thickness of the adhesive layer was 50 m. In these cases, the glass substrate surface is not damaged and the panel surface is not damaged. Even if the thickness of the adhesive layer is 25 μm or more and less than 50 μm, depending on the thickness of the adhesive layer, the functional film (transparent resin base material) may be cut without damaging the glass substrate surface. Although it is possible to peel the film filter, it is not preferable because it requires an improvement in the thickness accuracy of the transparent resin base material and an improvement in the depth accuracy of the cutter blade, leading to an increase in cost.

[0028] Further, as shown in Table 1, as the thickness of the adhesive layer in the film filter increases to 100 μm and 250 m, the flatness of the filter surface after bonding the film filter increases. I'm evil. This poor surface flatness does not degrade the display quality, such as causing distortion in the video display, but the appearance quality when the power is turned off (for example, the distortion of the reflected image of a fluorescent lamp). , Which is preferable for lowering.

[0029] Therefore, by increasing the thickness of the transparent resin base material, the film thickness after bonding the film filter is increased. The flatness of the surface of the filter was improved. Prepare film filters with different thicknesses of transparent resin base material and adhesive layer, and paste each film filter on a glass substrate with a thickness of about 3mm. Evaluation was performed. The film filter has a pressure-sensitive adhesive layer thickness of 25 m, 50 ^ m, and 100 m, and a transparent resin substrate thickness of 50 / zm, 100 ^ m, and 200 m, respectively. A layer having a thickness of 250 m and a transparent oyster effect having a thickness of 100 μm, 200 μm, and 300 μm was prepared.

[0030] The flatness of the filter surface relating to the thickness of the transparent resin substrate and the thickness of the adhesive layer after film filter bonding is shown in Table 2 and Fig. 3 below.

[0031] [Table 2]

[0032] In Table 2 and FIG. 3, the symbol “◯” indicates that the surface flatness is good, the symbol “△” indicates that the surface flatness is slightly bad, and the symbol “X” indicates the surface flatness. Show that it is evil! In FIG. 3, the horizontal axis represents the thickness (T) of the adhesive layer, and the vertical axis represents the transparent resin base material.

AD

Thickness (T).

PET

As apparent from Table 2 and FIG. 3, in the film filter, if the thickness (T) of the transparent resin base material is 1.1 times or more of the thickness (T) of the adhesive layer, the glass substrate Filter after bonding to

PET AD

It can be seen that the flatness of the surface is good.

[0034] Next, a film filter having a functional film (transparent resin base material) thickness of 300 μm and an adhesive layer thickness of 250 μm was prepared, and a 42-inch diagonal plasma display module was prepared. Bonded to the front glass of PDP. As shown in FIG. 2A, the transparent resin base material in the film filter was cut using a cutter having a depth adjusting function.

[0035] At this time, the depth of the cutter blade was such that the functional film (transparent resin base material) of the film filter was completely cut and did not reach the front glass of the display panel (PDP). In addition, the interval between adjacent cuts (corresponding to the peeling width of the film filter when peeling) was 50 mm, 1 OO mm, 200 mm, 300 mm, 400 mm, 500 mm, and the strips were made into strips.

[0036] The adhesive strength of this film filter to glass is 10NZ25mm (90 ° peeling, peeling speed 200mmZmin, temperature 25 ° C, humidity 50%). Therefore, the peeling forces at peeling widths of 50 mm, 10 Omm, 200 mm, 300 mm, 400 mm, and 500 mm are 20 N, 40 N, 80 N, 120 N, 160 N, and 200 N, respectively.

[0037] Table 3 shows the workability of the stripping work with respect to the stripping width and the presence or absence of display defects when stripping a film filter that has been cut into strips.

[0038] [Table 3]

[0039] As shown in Table 3, when the peel width to be peeled at once is 50 mm to 300 mm, the film filter can be peeled relatively easily, and display on the display panel after the film filter is peeled off. There were no defects. On the other hand, when the peel width is 400 mm or more, if the force required to peel off the film filter is large and the workability is poor, the display panel will stagnate due to the reaction caused by peeling, and the internal structure of the panel will be damaged. Problems such as display defects due to (such as rib collapse) occurred. Therefore, the width of the film to be peeled at one time is, for example, a film filter that peels at such an interval that a peel force of 150 N or less is desired.

[0040] As described above, the thickness of the adhesive layer of the film filter to be attached to the display panel is set to 50%. By setting the functional film thickness to 1.1 m or more and the thickness of the adhesive layer to 1.1 times or more, the film filter can be cut without damaging the front glass, facilitating peeling work and workability. Can be improved. In addition, the flatness of the filter surface after film filter bonding is not bad.

[0041] In addition, a functional film (transparent resin base material) is cut from the film filter attached to the front surface of the display panel, and a cut is made at a depth that does not reach the front glass of the display panel. By peeling off the glass, the force required for peeling without damaging the front glass can be reduced, and the peeling work can be performed efficiently, and the load on the display panel due to the reaction caused by peeling can be suppressed and the display panel can be prevented from being damaged. .

[0042] Since the peeling force generally decreases as the peeling speed decreases, it is desirable to appropriately set the peeling width and the peeling speed so that the total of the peeling tact time is shortened for each target. Moreover, in this embodiment mentioned above, although a PET film is shown as an example as a transparent resin base material, it is not limited to this, The same effect will be provided if a transparent resin base material can be cut | disconnected using a cutter. Can be obtained.

[0043] A specific configuration example of the film filter in the present embodiment is shown in FIGS. 4A and 4B. 4A and 4B schematically show the cross-sectional structure of the film filter, and the film filter is attached to the front glass of the display panel via the adhesive layers 41 and 51. FIG.

[0044] In Fig. 4A, 41 is an adhesive layer mainly composed of acrylic resin, and at least the functional film portion is completely cut, so that the adhesive layer itself is not cut completely, even on the cut surface. The hardness is adjusted to be cut along with the peeling. 42 is a transparent resin base material (for example, PET film), and 43 is a conductive layer laminated on one side of the transparent resin base material 42. That is, the transparent resin substrate 42 and the conductive layer 43 constitute an electromagnetic wave shielding film for blocking electromagnetic waves emitted from the display panel cover as one functional film.

[0045] 44 is an adhesive layer, 45 is a transparent resin base material (for example, PET film), and 46 is an antireflection film laminated on one side of the transparent resin base material 45. In other words, the transparent resin base material 45 and the antireflection film 46 constitute an antireflection film for preventing reflection of outside light as one functional film. Electromagnetic wave shielding film comprising transparent resin base material 42 and conductive layer 43 And an antireflection film comprising a transparent resin base material 45 and an antireflection film 46 are bonded together by an adhesive layer 44.

FIG. 4B shows a conductive layer disposed on the opposite side of the display panel in the electromagnetic wave shielding film of the film filter shown in FIG. 4A, which is disposed on the display panel side. In Fig. 4B, the adhesive layer 51, 54ί, the conductive layer 52, conductive layer 53, 55, transparent base material 56, antireflection film 56. The adhesive layers 51 and 54 correspond to the adhesive layers 41 and 44 shown in FIG. 4B, respectively, and the conductive layer 52 corresponds to the conductive layer 43 shown in FIG. The transparent resin base materials 53 and 55 correspond to the transparent resin base materials 42 and 45 shown in FIG. 4B, and the antireflection film 56 corresponds to the antireflection film 46 shown in FIG.

Note that the film filter in the present embodiment may include two functional films as shown in FIGS. 4 and 4 and provided with an adhesive layer on the side to be attached to the display panel. However, the number of functional films and the surface on which the filter layer is formed are arbitrary.

[0048] In addition, each of the above-described embodiments is merely an example of a specific example for carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main characteristic power thereof.

Industrial applicability

[0049] According to the present invention, a cut for facilitating peeling without damaging the display panel can be put in the film filter, and damage to the display panel can be prevented and workability related to peeling can be improved. And the flatness of the filter surface after the film filter is attached can be kept good.

Claims

The scope of the claims

[1] A display panel that displays images,

A functional film comprising a transparent resin base material and a filter layer laminated on one surface side of the transparent resin base material, and an adhesive layer, and the functional film on the front surface of the display panel via the adhesive layer With a film filter attached,

The display device according to claim 1, wherein the thickness of the functional film is 1.1 times or more of the thickness of the adhesive layer, and the thickness of the adhesive layer is 50 m or more.

[2] The film filter according to claim 1, wherein at least the functional film is completely cut so that the adhesive layer corresponding to the functional film can be peeled along the cut surface. Display device.

[3] The display device according to [1], wherein the functional film is at least one of an antireflection film, an electromagnetic wave shielding film, and a near-infrared shielding film.

[4] A plasma display panel that displays images;

A functional film composed of a transparent resin base material and a filter layer laminated on one side of the transparent resin base material, and an adhesive layer, and the front glass of the plasma display panel through the adhesive layer A film filter to which the functional film is attached, wherein the functional film has a thickness of 1.1 times or more of the thickness of the adhesive layer and a thickness of the adhesive layer of 50 A plasma display device characterized by being m or more.

5. The plasma display device according to claim 4, wherein the functional film is at least one of an antireflection film, an electromagnetic wave shielding film, and a near infrared shielding film.

[6] A method for peeling a film filter in which a functional film comprising a transparent resin base material and a filter layer is attached to the front surface of a display panel for displaying an image via an adhesive layer, the method comprising: The adhesive layer can be cut along the cut surface by cutting the functional film.

At least the transparent resin substrate of the functional film is completely cut to reach the adhesive layer, and a cut having a depth that does not reach the display panel is put in the film filter. A method for peeling a filter, characterized in that the film filter is peeled off the display panel along the cut line.

7. The method of peeling a filter according to claim 6, wherein the film filter is cut at intervals at which peeling force with respect to the front surface of the display panel due to peeling of the film filter is 150 N or less.