JP2004325663A - Panel sticking-together structure and display device equipped with panel having the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stuck-together structure of a panel which can accurately be positioned and fixed, has no remaining lump of an adhesive on an adhesion surface, and has a join of joint part made hard to see from the surface, and a panel having the stuck-together structure. <P>SOLUTION: The stuck-together structure is constituted by making joined surfaces of 1st and 2nd panels 1 and 2, made of light-transmissive materials having specified thicknesses uneven and joining the uneven joined surfaces together. The recessed joined surface of the 1st panel is formed of a V-shaped groove, e.g. X, Y or Z having 1st and 2nd surface opposite each other almost in a V shape, and a projection joined surface of the 2nd panel is fitted matching the V-shaped groove, and an adhesive is applied between both the joined surfaces and the 1st and 2nd panels are fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a translucent panel laminating structure, and more specifically, to accurately position and fix a panel, prevent adhesive lumps from remaining on an adhesive surface, and make a joint at a joint portion from the surface. The present invention relates to a panel bonding structure made difficult to see and a display device provided with a panel having the bonding structure.
[0002]
[Prior art]
BACKGROUND ART Translucent panels such as acrylic plates are used as optical members such as light guide plates and diffusion plates in various electronic devices, for example, liquid crystal display devices, and their use is limited to this type of electronic devices. It is widely used in other machinery, containers, etc.
[0003]
However, since such commonly distributed panels are limited in size to a predetermined size, when a larger panel is required, a plurality of panels are bonded and joined. This creates the large panels needed. However, when trying to join a plurality of panels, there are various problems. For example, it is necessary to make the shape of the joint surface easy to work and to secure a predetermined mechanical strength. Many panel bonding structures (hereinafter referred to as bonding structures) that solve this problem have been devised and implemented.
[0004]
It should be noted that a liquid crystal display device is also known in which two panels are bonded and joined to each other to increase the size, as described in Patent Document 1, for example.
[0005]
FIG. 5 shows some bonding structures which are different from this patent document.
[0006]
FIG. 5A is an external perspective view showing two panels to be bonded, and FIG. 5B illustrates different bonding structures (i) to (vii) in a portion C in FIG. It is a side view.
[0007]
As shown in FIG. 5, the two panels A and B are panels having the same thickness and a predetermined vertical width and a horizontal width, and are joined to each other at the side end surfaces in the vertical width direction. It has become. The bonding structure can be roughly classified into three types, for example, type I, type II, and type III.
[0008]
The type I is a type in which the inclined surfaces of the panels A and B are joined to each other as shown in FIGS. 5 (b) (i) to (iii). As shown in FIGS. 5 (iv) and 5 (v), type II is a type in which the joining surfaces of panels A and B are joined in an uneven shape without an inclined surface. In the type III, as shown in FIGS. 5 (vi) and (vii), the bonding surface of each of the panels A and B has an uneven shape having a cross section perpendicular to the inclined surface, or the inclined surface has a multi-stepped shape. It is a type that is joined in an uneven shape.
[0009]
In the type I bonding structure, as shown in FIGS. 5B and 5I, inclined surfaces having predetermined inclination angles α ₁ and β ₁ are formed on the front surface or the back surface of each of the panels A and B. An adhesive is applied to these inclined surfaces, and panels A and B are attached to each other. This type is variously modified, as shown in FIGS. 5 (b), (ii) and (iii), in which the inclined surfaces are further multi-stepped to provide inclination angles α ₂ , β ₂ , γ ₂ , or In some cases, the inclined surface is formed in a stepped shape, or inclined angles α ₅ and β ₅ are provided. The inclination angles α ₁ , β ₁ , α ₂ , β ₂ , γ ₂ , α ₅ , and β ₅ are all set to arbitrary angles within a range of acute angles.
[0010]
As shown in FIGS. 5 (iv) and 5 (v), the type III bonding structure has an uneven bonding surface as viewed from a vertical cross section.
[0011]
In addition, as shown in FIGS. 5 (vi) and (vii), the bonding structure of the type III is such that the inclination angles α ₃ , β ₃ , α ₄ , β ₄ , γ ₄ , δ ₄ are set to arbitrary angles. Has a concave-convex bonding surface set as described above.
[0012]
[Patent Document 1]
JP-A-8-146440 (page 3, right column, FIG. 1)
[0013]
[Problems to be solved by the invention]
However, as can be seen from FIGS. 5 (b) (i) to (iii), the type I bonding structure requires too strong a force to push the panels A and B from both sides during bonding. In addition, the adhesive surface on which the adhesive is applied slips and shifts, so that accurate positioning and fixing is difficult.
[0014]
Further, in the type II bonding structure shown in FIGS. 5 (b), (iv) and (v), when each of the panels A and B is a translucent panel, the bonding surface of the panels is easily observed from the surface, Not available for some. For example, in the case of using as a surface protection panel for displaying an image such as a liquid crystal display device, if the joint portion is visible, the image becomes difficult to see and the display quality is reduced. Further, in the case of (v), the shape of the joining surface is complicated, the processing is troublesome, and when the adhesive is applied more in the vicinity of the central portion, the adhesive hardly escapes. A lump is formed, and it is difficult to perform accurate positioning and fixing due to a displacement of the bonding surface.
[0015]
In addition, in the type III bonding structure shown in FIGS. 5 (b), (vi), and (vii), similarly to (v), the shape of the bonding surface is complicated, and an adhesive mass is likely to be formed near the center. It is difficult to accurately position and fix.
[0016]
Therefore, the present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to accurately position and fix the adhesive, and to prevent the adhesive mass from remaining on the adhesive surface. It is another object of the present invention to provide a panel bonding structure in which a joint at a joint portion is difficult to see from the surface, and a display device including a panel having the bonding structure.
[0017]
[Means for Solving the Problems]
The above object can be achieved by the following configurations.
[0018]
In the panel bonding structure of the present invention, the joining surfaces of the first and second panels each having a predetermined thickness and made of a light-transmitting material are formed in an uneven shape, and the uneven joining surfaces are fitted to each other. In the panel bonding structure in which the first and second panels are bonded together, the first panel includes a first and a second bonding surface, and the first and the second bonding surfaces are substantially V-shaped. The second panel includes a V-shaped groove, and the convex joint surface of the second panel is formed to fit into the V-shaped groove, and an adhesive is applied between the two joint surfaces to form the first panel. The second panel is fixed.
[0019]
Further, a lateral width of a region where the V-shaped groove is processed in the first and second panels is wider than a thickness of the first and second panels.
[0020]
Further, the V-shaped groove is characterized in that the area of the first and second joint surfaces is substantially equal, or the V-shaped groove is a joint surface of the first and second surfaces. , Wherein the area of one surface is smaller than the area of the other surface.
[0021]
Also, a panel bonding method in which the joining surfaces of the first and second panels each having a predetermined thickness and made of a light-transmitting material are formed in an uneven shape, and the uneven joining surfaces are fitted to each other and fixed. In the structure, a joining cross section of the first and second panels has a V-shape with two sides in a horizontal direction, and an adhesive is applied between the joining surfaces to form the first and second panels. Are fixed.
[0022]
Further, two sides of the laterally-shaped V-shaped joint section have substantially the same length. Alternatively, the two sides of the horizontal V-shaped junction cross section have different lengths. The two sides having different lengths are characterized in that the upper side is longer than the lower side.
[0023]
The display device further includes a panel having the bonding structure. The panel is a display panel forming a plurality of pixel portions, and the display panel is a liquid crystal panel.
[0024]
In this configuration, when the first and second panels are bonded together, the bonded surface does not slip and shift even when the panels are strongly bonded. Also, the adhesive does not remain on the joining surface to form a lump. In addition, since the joining surface does not have the most prominent vertical cut surface, the seam can be seen from the surface so that it is not difficult to see. Also, by applying to a display panel in a display device having this structure, the bonding is performed. The display device also has high display quality.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings. 1A and 1B show a panel bonding structure according to an embodiment of the present invention, wherein FIG. 1A is an external perspective view showing two panels to be bonded, and FIG. It is a side view which shows the bonding structure of FIG.
[0026]
Each of the two panels 1 and 2 has a predetermined thickness d, for example, 8 mm. The panels 1 and 2 have front surfaces 1a and 2a and back surfaces 1b and 2b, respectively, and the vertical width (length in the vertical direction of the panel) on the side surfaces 1c and 2c of the panels 1 and 2 is, for example, 100 to 200 mm. The lateral width (lateral length of the panel) of the end surfaces 1d and 2d is, for example, 100 to 200 mm. The panels 1 and 2 are large panels made of a light-transmitting material, for example, an acrylic plate, and are bonded together by pressing the side end surfaces 1c and 2c in the direction of the arrow. The thickness d of each of the panels 1 and 2 is preferably the same.
[0027]
One side end faces 1c and 2c of the two panels 1 and 2 are processed so that the bonding surface forms a V-shape in the lateral direction. Region t where processing is given in panel 1, when a reference to one of the panel 1, a region went from t ₀ to the end portion of the side end face 1c on the surface 1a in the lateral direction until t _1. The width from t ₀ to t ₁ in the processing area t is set to be longer than the thickness d of each of the panels 1 and 2 and several times the thickness d.
[0028]
Then, bonding surfaces X, Y, and Z are formed in the region t.
[0029]
Referring to FIG. 1 (b), first, each point is placed at a predetermined position in the thickness direction of each of the panels 1 and 2, for example, a point of １ ／ × d, ×× d, ／ × d. Draw the assumed parallel lines dy, dx, dz (lines parallel to the back side in the width direction) passing through, and denote the intersection of these parallel lines with the vertical line d ₁ extending in the thickness direction at t ₁ , respectively. , A, c.
[0030]
Next, for example, any one of a V-shaped joint surface X, a joint surface Y, and a joint surface Z is formed on the side end surfaces 1c, 2c of the panels 1, 2.
[0031]
The joining surface X has a V-shaped cross-sectional shape composed of two sides connecting t ₀ , a, and t _x . Incidentally t _x is a position where the end portion of the side end face 1c of the rear surface 1b, is located in a vertical line d ₂ extending in the thickness direction at t _0. That it is located in the same place as t ₀ of the back surface 1b.
[0032]
The bonding surface Y is, t _{0, b,} has a V-shaped cross section comprising two sides connecting the t _y. And t _y is a position where the end portion of the side end face 1c of the rear surface 1b, is located at a distance t _y from vertical d ₂ at the back surface 1b.
[0033]
The bonding surface Z is, t _{0, c,} has a V-shaped cross section comprising two sides connecting the t _z. And _{t z} is a position where the end portion of the side end face 1c of the rear surface 1b, located _{t z (t y <t z} ) away from the vertical line _{d 2} in the back surface 1b.
[0034]
Incidentally, the bonding surfaces X, Y, t positioned on the back surface 1b on the Z _x, t _y, and t _z, may be set anywhere in the area t the joint surface is formed. In this case, it is not preferable that t _x , t _y , and t _z are located on the vertical line d ₁ , so that they are excluded.
[0035]
Then, an adhesive is applied to each of the joining surfaces X, Y, and Z, and each panel is bonded and fixed. The adhesive has substantially the same refractive index as the material constituting the panels 1 and 2, is colorless and transparent, and further has a viscosity that spreads evenly on the bonding surface and does not drip. Adhesives that set after a few minutes are preferred.
[0036]
By configuring the joining surfaces X, Y, and Z as described above, the joining surface slips at the time of joining as in the related art, so that there is no possibility of displacement, and the adhesive can easily escape from the joining surface. In addition, the adhesive does not remain on the adhesive surface to form a lump. Further, since the angle of the joining surface is formed to be an acute angle or an obtuse angle, the joining surface becomes less noticeable. Further, since the shape of the end portion is relatively simple, the joining surface can be easily cut, so that the accuracy of the joining surface can be improved.
[0037]
With reference to FIGS. 2 and 3, the shapes of the joint surfaces X, Y, and Z and the features of the joints will be described in detail.
[0038]
2 is a side view showing the bonding surface X of FIG. 1B, FIG. 3 is a side view showing the bonding surface Y of FIG. 1B, and FIG. 3 is a bonding surface of FIG. It is the side view which showed Z.
[0039]
Referring to FIG. 2, bonding surface X is formed in a horizontal V-shape with a bottom at a along a center line ×× d of thickness d of each of panels 1 and 2. That is, the panel 1 has a V-shaped groove formed in the side end face 1c in the vertical width direction of the panel, while the panel 2 has the V-shaped groove formed in the side end face 2c in the vertical width direction of the panel. A spear-shaped projection that fits into the hole is formed. Next, the above-mentioned adhesive is applied to this joint surface, and the panels 1 and 2 are bonded and fixed.
[0040]
Angle theta _x formed between the panel surface 1a and the upper joint surface a _x is chosen at any angle, depending on to the panel material to less than 10 °, the tip mechanical strength is weakened Is not preferred because it may be damaged. This angle is preferably 15 ° to 20 °. Also, as for the V-shaped slot and the spear-shaped projection, as the angle becomes sharper, the mechanical strength becomes weaker. Therefore, this angle is preferably 20 ° to 60 °.
[0041]
On the other hand, there is a possibility that the applied amount of the adhesive may vary on the bonding surface X. Therefore, as a countermeasure, it can be solved by making a cut in the surface of the spear-shaped projection (not shown), applying a large amount of adhesive to the cut, and wiping off the adhesive before the adhesive hardens. As the cut, for example, a shape extending in the vertical width direction of the panel can be considered.
[0042]
Further, the range where the bonding surface b _x of the lower side the joint surface X can not hidden in the upper joint surface a _x is the extension of the line connecting the t _x and a, and t _x and t _o the line connecting, that is, the range in 10x vertical line _{d 2.}
[0043]
Referring to FIG. 3, joining surface Y is formed in a horizontal V-shape as bottom b along 厚 み × d of thickness d of each of panels 1 and 2. That is, a V-shaped slot is formed in the panel 1 on the side end face 1c in the vertical width direction of the panel, while the V-shaped slot of the panel 1 is fitted in the panel 2 on the side end face 2c in the vertical width direction of the panel. A mating spear is formed.
[0044]
Range where the bonding surface b _y can not hidden in the upper joint surface a _y lower in this joint surface Y is connecting the extension line of the line connecting the t _y and b, and the t _y and t _o It becomes 10y within the range of the extension of the elbow. In addition, the angle θ _y , the application of the adhesive, and the like are the same as those of the bonding surface X described above.
[0045]
Further, referring to FIG. 4, in the joint surface Z, the joint surface Z is formed in a horizontal V-shape as a bottom portion c along ３ d of the thickness d of each of the panels 1 and 2. That is, a V-shaped slot is formed in the panel 1 on the side end surface in the vertical width direction of the panel, while the V-shaped slot of the panel 1 is fitted in the panel 2 on the side end face in the vertical width direction of the panel. A V-shaped projection is formed.
[0046]
Range where the lower joint surface b _z in this joining surface Z can not hidden in the upper joint surface a _z is the extension of the line connecting the t _z and c, connecting the t _z and t _o It is 10z within the range of the extension of the line. In addition, the angle θ _z , the application of the adhesive, and the like are the same as those of the bonding surface X described above. From this, it can be seen that the bonding surface having the widest visual field range is the bonding surface Z shown in FIG.
[0047]
The most noticeable places when the panels are joined are the cut ends of the upper and lower surfaces. However, it may be conspicuous or hidden depending on the cutting shape and the viewing angle. For example, when the area of the upper joint surface is larger than the area of the lower joint surface, the lower cut end portion is easily hidden. More particularly, for example, a junction plane X, Y, when a shape such as a Z,, from the upper surface side cutting edge t ₀ in the junction plane, the vertical lines d ₁ to a position to change the cutting angle in the region t the shadow of the cut surface to top, if there is a lower surface side cutting edge t _x ~t _Z, a lower surface side cutting edge t _x ~t _Z is not hidden. This is because the viewing angle hiding of the lower surface side cutting edge t _X ~t _Z by the shape of the joint surface is different.
[0048]
With the above configuration, there is no fear that the joining surface slips during joining, and the adhesive easily escapes from the joining surface. In addition, since the cutting angle is formed at an acute angle or an obtuse angle, the joining surface is not conspicuous, and the end shape is relatively simple, so that the joining surface can be easily cut, thereby improving the positional accuracy of the joining surface. it can.
[0049]
Next, a case where the flat display panel having the above configuration is used for a display device will be described. It is actually difficult to manufacture a large-sized display device with one large-sized display panel due to the yield, the manufacturing device, and the like. Therefore, it is known to manufacture a large-sized display device by connecting a plurality of small or medium-sized display panels to realize one large-sized display panel. In this case, a light-transmitting panel such as a glass substrate or a plastic substrate is usually used for the display panel. Then, by bonding the glass substrates and the like, various problems occur at the joints where the display panels are joined. In particular, in the case of a display flat panel, one of its features is its thinness, so that it is difficult to process and work at the joint, and if the joint is conspicuous, an observer may feel uncomfortable.
[0050]
However, by laminating the display panels using the laminating structure as in the present application, workability and workability are improved, and the joined portions are less noticeable. Note that the display panel referred to here is a panel that performs display by emitting light from each of a plurality of pixel units arranged in a matrix based on an image signal from the outside or the like. A flat panel such as an EL panel or a liquid crystal panel which performs display by emitting light in a pixel portion using a light source from the outside.
[0051]
Particularly, in a liquid crystal display device using a liquid crystal panel, the bonding structure as in the present application is effective. In general, a liquid crystal display device uses a light source such as a fluorescent tube and a backlight having various optical members such as a diffusion plate in addition to a liquid crystal panel. When the size of the liquid crystal display device is increased, a reinforcing plate such as glass is used between the liquid crystal panel and the backlight. Further, a light-transmitting resin substrate or the like is disposed on the front surface of the liquid crystal panel for the purpose of protecting the panel or the like. Therefore, since a plurality of panels having various translucencies are used, if such panels are bonded by a conventional bonding structure, the problem of workability and workability of a joined portion is further increased. , And adversely affect the display.
[0052]
However, by using the bonding structure of the present application, in a large-sized liquid crystal display device manufactured by bonding a plurality of liquid crystal panels or a light-transmitting optical member such as a diffusion plate, the bonding surface is inconspicuous. It has effects such as high alignment accuracy, and it is possible to provide a liquid crystal display device with high display quality. It should be noted that, even in a display device other than the liquid crystal display device, even when a translucent panel is used to protect the display panel in addition to the display panel, the bonding structure as in the present application is naturally effective. is there.
[0053]
【The invention's effect】
As described above, according to the panel bonding structure of the present invention, the bonding surface does not slip during the bonding, no adhesive mass is formed on the bonding surface, and the shape of the panel end is compared. A panel bonding structure that can be formed easily and easily can be realized, and a panel bonding structure in which a bonded portion after bonding is inconspicuous can be provided. In addition, by manufacturing a display device having the panel bonding structure of the present invention, a large display device with high display quality can be provided.
[Brief description of the drawings]
FIG. 1 shows a panel bonding structure according to an embodiment of the present invention. FIG. 1 (a) is an external perspective view showing two panels to be bonded, and FIG. 1 (b) is a portion C in FIG. 1 (a). The side view which shows the bonding structure of FIG.
FIG. 2 is a side view showing a bonding surface X of FIG. 1 (b).
FIG. 3 is a side view showing a joining surface Y of FIG. 1 (b).
FIG. 4 is a side view showing a bonding surface Z of FIG. 1 (b).
5A and 5B show a prior art, and FIG. 5A is an external perspective view showing two panels to be bonded, and FIG. 5B shows a bonding structure of a portion C in FIG. (I)-(vii) are side views for explaining different types of bonding structures.
[Explanation of symbols]
1 panel (first panel)
2 panels (second panel)
X, Y, Z joint surface

Claims (11)

In a panel bonding structure in which first and second panels each having a predetermined thickness and made of a light-transmitting material are formed in a concavo-convex shape, and the concavo-convex joint surfaces are fitted to each other and fixed. The concave joining surface of the first panel comprises first and second joining surfaces, and the first and second joining surfaces comprise a V-shaped groove in which the first and second joining surfaces face each other in a substantially V-shape. The convex joint surface of the second panel is formed so as to fit into the V-shaped groove, and the first and second panels are fixed by applying an adhesive between the two joint surfaces. Panel bonding structure characterized by the following. The panel attachment according to claim 1, wherein a width of a region where the V-shaped groove is processed in the first and second panels is wider than a thickness of the first and second panels. Matching structure. 3. The panel bonding structure according to claim 1, wherein the V-shaped groove has substantially equal areas of the first and second joining surfaces. 4. 3. The panel bonding method according to claim 1, wherein an area of one surface of the V-shaped groove is smaller than an area of the other surface in a joining surface of the first and second surfaces. Construction. In a panel bonding structure in which first and second panels each having a predetermined thickness and made of a light-transmitting material are formed in an irregular shape, and the uneven joint surfaces are fitted and fixed to each other. The joining cross section of the first and second panels has a horizontal V-shape consisting of two sides, and the first and second panels are fixed by applying an adhesive between the two joining surfaces. Panel bonding structure characterized by being performed. 6. The panel bonding structure according to claim 5, wherein two sides of the horizontal V-shaped joining cross section have substantially the same length. 6. The panel bonding structure according to claim 5, wherein two sides of the laterally V-shaped junction cross section have different lengths. The panel bonding structure according to claim 7, wherein the two sides having different lengths have an upper side longer than a lower side. The display device according to claim 1, further comprising a panel having the bonding structure. The display device according to claim 9, wherein the panel is a display panel having a plurality of pixel units. The display device according to claim 10, wherein the display panel is a liquid crystal panel.

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