JP4269759B2 - Display device having panel bonding structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-transmitting panel laminating structure, and more specifically, positioning and fixing can be accurately performed, and an adhesive lump is not left on an adhesive surface and a joint seam is formed from the surface. The present invention relates to a panel bonding structure that is difficult to see and a display device including a panel having the bonding structure.
[0002]
[Prior art]
A panel having translucency such as an acrylic plate is used as an optical member such as a light guide plate or a diffusion plate in various electronic devices, for example, liquid crystal display devices, and its use is limited to this type of electronic device. It is widely used for other machinery and containers.
[0003]
However, since such a generally distributed panel is limited to a predetermined size, if a larger panel is required, a plurality of panels are bonded and bonded together. Large panels that are needed are made. However, when trying to join a plurality of panels, there are various problems. For example, it is necessary to make the joining surface easy to process and to ensure a predetermined mechanical strength. And many panel bonding structures (henceforth a bonding structure) which solve this subject are devised and implemented.
[0004]
In addition, also in a liquid crystal display device, for example, as described in Patent Document 1, a large-sized one obtained by bonding and joining two panels is known.
[0005]
FIG. 5 is different from this patent document, but shows several bonding structures.
[0006]
FIG. 5 (a) is an external perspective view showing two panels to be bonded together, and FIG. 5 (b) illustrates different bonding structures (i) to (vii) in a portion C of 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 having a predetermined vertical width and horizontal width, and are joined to each other at the side end surfaces in the vertical width direction. It is like that. The bonding structure can be roughly classified into three types, for example, type I, type II, and type III.
[0008]
Type I is a type in which the inclined surfaces of the panels A and B are joined together 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 the panels A and B are joined in an uneven shape without an inclined surface. In Type III, as shown in FIGS. 5 (vi) and (vii), the joining surfaces of the panels A and B are made uneven with 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]
As shown in FIGS. 5B and 5I, the type I bonding structure is formed with inclined surfaces having predetermined inclination angles α ₁ and β ₁ with respect to the front or back surfaces of the panels A and B. The adhesive is applied to these inclined surfaces, and the panels A and B are bonded together. This type is variously changed, and as shown in FIGS. 5 (b) (ii) and (iii), the inclined surfaces are further multi-staged to provide the inclination angles α ₂ , β ₂ and γ ₂ , or Some of the inclined surfaces are stepped or provided with inclination angles α ₅ and β ₅ . Note that 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 an acute angle range.
[0010]
In addition, the type III bonding structure has an uneven joint surface as shown in FIGS. 5 (iv) and 5 (v).
[0011]
Further, as shown in FIGS. 5 (vi) and 5 (vii), the type III bonding structure has an inclination angle α ₃ , β ₃ , α ₄ , β ₄ , γ ₄ , δ ₄ at an arbitrary angle. It has the uneven | corrugated shaped joint surface set to (1).
[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 the structures shown in FIGS. 5 (b) (i) to (iii), the type I bonding structure is too strong to push the panels A and B from both sides during bonding. The adhesive surface to which the adhesive is applied slips and shifts, making accurate positioning and fixing difficult.
[0014]
In addition, the type II bonding structure of FIGS. 5 (b), 5 (iv), and 5 (v) is such that when the panels A and B are translucent panels, the joint surfaces of the panels are easily observed from the surface. Some cannot be used. For example, in the case of using as a surface protection panel for projecting an image such as a liquid crystal display device, if the joint portion is seen, the image becomes difficult to see and the display quality is deteriorated. Furthermore, in the case of (v), when the shape of the joining surface is complicated, the processing is troublesome, and when a large amount of adhesive is applied near the center, the adhesive becomes difficult to escape. A lump is formed and the bonding surface is displaced, and accurate positioning and fixing is difficult.
[0015]
In addition, in the type III bonding structure shown in FIGS. 5B, 5B, and 5I, the shape of the joint surface is complicated as in (v), and an adhesive lump is easily formed near the center. Accurate positioning and fixing is difficult.
[0016]
Therefore, the present invention has been made to solve the above-described problems of the prior art, and an object of the invention is to enable accurate positioning and fixing so that no lump of adhesive remains on the bonding surface. It is another object of the present invention to provide a panel bonding structure in which the joints are hardly visible from the surface and a display device including the panel having the bonding structure.
[0017]
[Means for Solving the Problems]
The above object can be achieved by the following configurations.
[0018]
A display device having a panel bonding structure according to the present invention includes a first display panel and a second display panel made of a light-transmitting material having a predetermined thickness and forming a plurality of pixel portions. A display device having a panel bonding structure in which a joint surface between the first display panel and the second display panel is formed in a concavo-convex shape, and the concavo-convex joint surface is fitted and fixed to each other. In addition, the junction cross section between the first display panel and the second display panel has a lateral V-shape consisting of only two sides, and the two sides of the V-shaped junction cross section have a length. The two sides having different lengths are such that the upper side on the display side is longer than the lower side, and an adhesive is applied between the joint surfaces to form the first display panel and the two sides. The second display panel is fixed to the second display panel.
[0023]
Further, the display device includes a panel having the bonding structure. The display panel is a display panel in which a plurality of pixel portions are formed, and the display panel is a liquid crystal panel.
[0024]
In this configuration, when the first and second panels are bonded to each other, even if the panels are strongly bonded, the bonding surfaces do not slip and shift. In addition, the adhesive remains on the joint surface and does not form a lump. In addition, since the joining surface does not have a vertical cut surface where the joint is most conspicuous, there is no difficulty in seeing the joint from the surface, and it is bonded and bonded by applying it to a display panel in a display device having this structure. The display device also has a high display quality.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described with reference to 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 together, and FIG. 1 (b) is a portion C of FIG. It is a side view which shows this bonding structure.
[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 and back surfaces 1a and 2a and back surfaces 1b and 2b, respectively, and the vertical width length (the length in the vertical direction of the panel) at the panel 1 and 2 side end faces 1c and 2c is, for example, 100 to 200 mm. The widths of the end faces 1d and 2d (the length in the horizontal direction of the panel) are, 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 faces 1c and 2c from the arrow direction. The thicknesses d of the panels 1 and 2 are preferably the same.
[0027]
The side surfaces 1c and 2c of the two panels 1 and 2 are processed so that the bonding surface is V-shaped 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 region t is set longer than the thickness d of the panels 1 and 2 and several times the thickness d.
[0028]
Then, bonding surfaces X, Y, and Z are formed in this region t.
[0029]
Referring to FIG. 1B, first, each point is placed at a predetermined location in the thickness direction of each panel 1, 2 such as 1/4 × d, 1/2 × d, and 3/4 × d. Draw assumed parallel lines dy, dx, dz (lines in the lateral width direction and parallel to the back surface), and each of these parallel lines intersects with a vertical line d ₁ extending in the thickness direction at t ₁ . , A, c.
[0030]
Next, any one of, for example, a V-shaped joining surface X, a joining surface Y, and a joining surface Z is formed on the side end surfaces 1c and 2c of the panels 1 and 2.
[0031]
The joint 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 is, it is located at the same position as t ₀ on 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. T _z is a position that becomes the end of the side end face 1c on the back surface 1b, and is located at a position away from the vertical line d ₂ by t _z (t _y <t _z ) on 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 _tz are located on the vertical line d ₁ , and are excluded.
[0035]
Then, an adhesive is applied to each joint surface X, Y, Z, and each panel is bonded and fixed. The adhesive has almost the same refractive index as the material constituting the panels 1 and 2, is colorless and transparent, and has a viscosity that spreads uniformly on the adhesive surface and does not dripping, and is not an instantaneous adhesive. An adhesive that hardens after a few minutes is preferred.
[0036]
By configuring the bonding surfaces X, Y, and Z as described above, the bonding surface slips at the time of bonding and there is no risk of displacement, and the adhesive can easily escape from the bonding surface as in the prior art. The adhesive remains on the bonding surface and does not become a lump. Further, since the angle of the joint surface is formed as an acute angle or an obtuse angle, the joint surface becomes inconspicuous. Furthermore, since the end shape is relatively simple, the joint surface can be easily cut, and the accuracy of the joint surface can be improved.
[0037]
With reference to FIGS. 2-3, the shape of each joint surface X, Y, Z and the characteristic of a joint are explained in full detail.
[0038]
2 is a side view showing the joining surface X of FIG. 1B, FIG. 3 is a side view showing the joining surface Y of FIG. 1B, and FIG. 3 is the joining surface of FIG. It is the side view which showed Z.
[0039]
Referring to FIG. 2, the joint surface X is formed in a horizontal V shape with the bottom portion a along the center line 1/2 × d of the thickness d of each panel 1, 2. That is, the panel 1 is formed with a V-shaped groove on the side end face 1c in the vertical direction of the panel, while the panel 2 has a V-shaped groove on the side end face 2c in the vertical direction of the panel. A hook-shaped protrusion that fits into the hole is formed. Next, the adhesive is applied to the joint surface, and the panels 1 and 2 are bonded and fixed.
[0040]
The angle θ _x formed between the panel surface 1a and the upper joint surface a _x is selected to an arbitrary angle, but if it is 10 ° or less, it depends on the panel material, but the mechanical strength decreases and the tip part Is not preferable because it may be damaged. This angle is preferably 15 ° to 20 °. In addition, since the mechanical strength of the V-shaped groove and the hook-shaped protrusion becomes weaker as the angle becomes acute, the angle is preferably 20 ° to 60 °.
[0041]
On the other hand, variations in the amount of adhesive applied on the joint surface X may occur. Therefore, as a countermeasure, it can be solved by making a cut (not shown) on the surface of the hook-shaped protrusion, applying a large amount of adhesive to the cut, and wiping it off before the adhesive is cured. As this notch, for example, a shape extending in the vertical width direction of the panel can be considered.
[0042]
Further, the range where the lower joint surface b _x is hidden behind the upper joint surface a _x and cannot be seen on the joint surface _X is an extension of the line connecting t _x and a, and t _x and t _o . 10x within the range of the line connecting the _two , that is, the vertical line d2.
[0043]
Referring to FIG. 3, the bonding surface Y is formed in a horizontal V shape as a bottom b along ¼ × d of the thickness d of each panel 1, 2. That is, a V-shaped slot is formed in the side end surface 1c of the panel in the vertical width direction on the panel 1, while a V-shaped slot in the panel 1 is fitted in the side end surface 2c of the panel in the vertical width direction. Matching hook-shaped projections are 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 line of the ellipse. In addition, the angle θ _y , the application of the adhesive, and the like are the same as those of the joint surface X.
[0045]
Furthermore, referring to FIG. 4, at the joint surface Z, the joint surface Z is formed in a horizontal V shape as a bottom c along 3 / 4d of the thickness d of each panel 1, 2. That is, the panel 1 is formed with a V-shaped slot on the side end surface in the vertical width direction of the panel, while the panel 2 is fitted with the V-shaped slot on the side end surface in the vertical width direction of the panel 1. A V-shaped protrusion is formed.
[0046]
In this joint surface Z, the range where the lower joint surface b _z is hidden behind the upper joint surface a _z is invisible and the extension line of the line connecting t _z and c is connected to t _z and t _o . It becomes 10z within the range of the extended line. In addition, the angle θ _z , the adhesive application, and the like are the same as those of the joint surface X described above. From this, it can be seen that the joint surface having the widest visual field range is the joint surface Z shown in FIG.
[0047]
The most conspicuous part when the panels are joined is the cut end portions of the upper and lower surfaces. However, it may be conspicuous or hidden depending on the cut shape and 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 is easily hidden. More specifically, for example, when the joint surface is shaped like X, Y, Z, the vertical line d ₁ that is the position to change the cutting angle in the region t from the upper surface side cut end t ₀ on the joint surface. When the lower surface side cut ends t _{x to} t _Z are in the shadow of the upper cut surface, the lower surface side cut ends t _{x to} t _Z are hidden and cannot be seen. This is because the viewing angle at which the lower surface side cut ends t _{X to} t _Z are hidden differs depending on the shape of the joint surface.
[0048]
By having the configuration as described above, there is no fear that the joining surface slips during joining, and there is less concern that the adhesive will remain on the joining surface because it is easy to escape from the joining surface, In addition, since the cutting angle is formed as an acute angle or an obtuse angle, the bonding surface becomes inconspicuous, and the end shape is relatively simple, so that the cutting of the bonding surface can be facilitated, thereby improving the positional accuracy of the bonding surface. it can.
[0049]
Next, a case where a flat display panel having the above configuration is used in a display device will be described. In practice, it is difficult to manufacture a large display device using a single large display panel due to the yield, manufacturing apparatus, and the like. Thus, it is known to manufacture a large display device by connecting a plurality of small or medium display panels to realize a single large display panel. In this case, a translucent panel such as a glass substrate or a plastic substrate is usually used as the display panel. And by sticking this glass substrate etc., the various problems in the junction part which joined the display panel will arise. In particular, in the case of a flat panel for display, the thinness is one of the characteristics, so that it is difficult to process and work at the joined portion, and if the joined portion is conspicuous, the observer feels uncomfortable.
[0050]
However, by bonding the display panel using the bonding structure as in the present application, the workability and workability are improved, and the joined portion is not noticeable. Here, the display panel is a display panel that emits light from each of a plurality of pixel portions arranged in a matrix based on a video signal from the outside, for example, a self-luminous PDP, an organic It is an EL panel or a flat panel such as a liquid crystal panel that emits light from a pixel portion using an external light source for display.
[0051]
In particular, in a liquid crystal display device using a liquid crystal panel, the bonding structure as in the present application is effective. Usually, in a liquid crystal display device, in addition to a liquid crystal panel, a light source such as a fluorescent tube and a backlight having various optical members such as a diffusion plate are used. If the liquid crystal display device becomes large, a reinforcing plate such as glass is used between the liquid crystal panel and the backlight. Furthermore, a translucent resin substrate or the like is disposed on the front surface of the liquid crystal panel for the purpose of protecting the panel. Therefore, since a plurality of panels having various translucency are used, if such a panel is bonded by a conventional bonding structure, the problem of workability and workability of the joint portion is further increased. In addition, the display is adversely affected.
[0052]
However, in the large-sized liquid crystal display device manufactured by bonding a plurality of liquid crystal panels and a light-transmitting optical member such as a diffusion plate by using the bonding structure of the present application, the bonding surface is not noticeable, and the position This brings about effects such as high alignment accuracy, and it is possible to provide a liquid crystal display device with high display quality. Note that, in a display device other than a liquid crystal display device, a bonded structure as in the present application is naturally effective even when a translucent panel is used to protect the display panel in addition to the display panel. is there.
[0053]
【The invention's effect】
As described above, according to the panel laminating structure of the present invention, the joining surface does not slip during joining, and no adhesive lump is formed on the adhesion surface, and the shape of the panel end is also compared. A panel bonding structure that can be formed easily can be realized, and a panel bonding structure in which the bonded portion after bonding is not conspicuous 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]
1A and 1B show a panel bonding structure according to an embodiment of the present invention, in which FIG. 1A is an external perspective view showing two panels to be bonded, and FIG. 1B is a C portion of FIG. The side view which shows the bonding structure of.
FIG. 2 is a side view showing a joint surface X in FIG.
FIG. 3 is a side view showing a bonding surface Y in FIG.
4 is a side view showing a joint surface Z in FIG.
5A is a perspective view showing an external appearance of two panels to be bonded together, and FIG. 5B is a perspective view showing a bonding structure of a portion C in FIG. 5A. Figures (i) to (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 interface

Claims (2)

A first display panel and a second display panel made of a light-transmitting material having a predetermined thickness and forming a plurality of pixel portions ;
Forming a joint surface between the first display panel and the second display panel in a concavo-convex shape;
A display device having a panel bonding structure in which the uneven bonding surfaces are fitted and fixed to each other ,
The joining cross section of the first display panel and the second display panel is a lateral V-shape consisting of only two sides,
The two sides of the V-shaped joint cross section are different in length,
The two sides of the different length are longer on the upper side on the display side than the lower side,
A display device, wherein an adhesive is applied between the joint surfaces to fix the first display panel and the second display panel. The display device according to claim 1 , wherein the display panel is a liquid crystal panel.

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