JP4784001B2 - Display panel and curved display device having the panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display panel (for example, a liquid crystal display panel) that can be bent and deformed by stacking a plurality of flexible display elements. The present invention also relates to a curved display device (for example, a liquid crystal display device) using a display panel that can be bent and deformed.
[0002]
BACKGROUND OF THE INVENTION
In recent years, it has become possible to make a liquid crystal display element using a light and thin film substrate such as a resin, and therefore, a multilayer liquid crystal display device in which a plurality of these liquid crystal display elements are stacked has attracted attention.
[0003]
FIG. 8 is a partial sectional view schematically showing an example of such a liquid crystal display device. As shown in the figure, the display device 2 has three stacked display elements 6 (in order from the observation side, a blue display element 6B, a green display element 6G, and a red display element 6R).
[0004]
Each display element 6 (6B, 6G, 6R) includes a film-like first substrate 9 (9B, 9G, 9R) and a second substrate 10 (10B, 10G, 10R) made of a transparent material. A resin structure 12 for adhering and supporting the substrate 9 and the second substrate 10, and a liquid crystal 14 filled in a gap formed by the resin structure 12. The liquid crystal 14 is, for example, a chiral nematic liquid crystal that can selectively reflect light having a wavelength in the visible range. The liquid crystal 14 is sealed by a seal wall (not shown) provided so as to surround the display portion of each display element 6. Here, the display unit refers to a portion of each display element 6 constituting a display area (consisting of a set of pixels) of the liquid crystal display device. Further, in the following description, a portion sandwiched between the first substrate 9 and the second substrate 10 is referred to as a display layer. Although not shown, a spherical spacer is also included between the first and second substrates 9 and 10. If necessary, the light absorption layer 15 is provided on the back surface of the second substrate 10R of the red display element 6R. A plurality of transparent strip-like upper electrodes 16 (16B, 16G, 16R) are arranged in parallel at predetermined intervals on the lower surface of the first substrate 9. On the other hand, on the upper surface of the second substrate 10, a plurality of transparent strip-like lower electrodes 18 (18B, 18G, 18R) are arranged in parallel at predetermined intervals. The arrangement direction of the upper electrode 16 and the lower electrode 18 is orthogonal when viewed from the direction perpendicular to the substrate, and the upper electrode 16 and the lower electrode 18 are opposed to each other (when viewed from the direction perpendicular to the substrate). Of the display device 2 form a pixel. These sets of pixels are arranged in a matrix and display is performed using the set of pixels. Specifically, by applying a predetermined voltage to the predetermined upper and lower electrodes 16, 18, at the intersection (when viewed from the direction perpendicular to the substrate) of the upper electrode 16 and the lower electrode 18. Display is performed by changing the state of the liquid crystal portion.
[0005]
For example, the multi-layer liquid crystal display device is manufactured by stacking a plurality of display elements 6B, 6G, and 6R through an adhesive layer such as an adhesive so that the display elements are not misaligned and aligned. The
[0006]
By the way, in recent years, there is an increasing demand for a display device having a curved surface instead of a flat surface for reasons such as design and placement, and the liquid crystal display device as described above is flexible as a whole, and thus meets such a demand. Expected as a thing.
[0007]
However, in practice, the display element is laminated in a planar shape by attaching another display element to the display element held on the support base having a flat support surface through an adhesive layer, and then these display elements are laminated. Even when a liquid crystal display device is manufactured by curving the display element with a housing, the sealing wall enclosing the liquid crystal may be peeled off or damaged due to use or storage in a high temperature environment. In addition, the same problem occurs even when a display element is laminated in a curved shape by attaching another display element to the display element held on a support base having a curved support surface through an adhesive layer. It was. This is because each display element expands and contracts depending on the environmental conditions around the element such as temperature and humidity. However, since the display elements are fixed to each other with an adhesive layer, the generated stress is applied to the seal wall. It is considered a thing.
[0008]
Therefore, the present invention aims to alleviate the stress generated when each display element expands and contracts due to environmental conditions around the element such as temperature and humidity, thereby preventing the display element from being damaged. .
[0009]
SUMMARY OF THE INVENTION
In order to achieve the above object, a display panel according to the present invention is formed by laminating a plurality of flexible display sub-panels with an adhesive layer having a translucent fluid. In this application, a display sub-panel means each panel which comprises a display panel.
[0010]
Further, in the present application, the fluid means a medium that can fill at least a region corresponding to the display region between the display sub-panels without a gap and can be deformed spontaneously or by applying an external force. . Since the fluid can be deformed into an arbitrary shape, it is not prevented that the display sub-panels are displaced from each other in the surface direction along with the curvature.
[0011]
The fluid includes a liquid, a solid or semi-solid substance, and a liquid in which a solid is dispersed. The solid or semi-solid substance includes a gel (particularly a jelly-like gel), a grease-like solid or semi-solid substance, and the like. In the case where a solid is dispersed in a liquid, a sol using the liquid as a dispersion medium is included.
[0012]
You may make it provide the control area | region which controls the relative position of the surface direction of display subpanels in a part between display subpanels. Thereby, it is possible to substantially prevent the positional shift between the display sub-panels when the display panel is curved. In one embodiment, the display sub-panel is formed in a square shape, and the restriction region is provided in the vicinity of a line connecting the centers of two opposing sides.
[0013]
In the display device using the display panel according to the present invention, the restriction area may be provided outside the display portion of each display sub-panel so as not to hinder display.
[0014]
As a fluid, a liquid, a solid, or the like can be used as long as it can fill at least the area corresponding to the display area between the display sub-panels without gaps and can be deformed spontaneously or by applying an external force. Or a semi-solid substance or a liquid in which a solid is dispersed. Anyway, what is necessary is just to have translucency which does not prevent the display of a display panel.
[0015]
A fluid containing liquid has high fluidity, can be easily filled without a gap between display sub-panels, and can be suitably used as a fluid because it deforms following the bending of the display panel. More preferably, a highly viscous liquid is used as the fluid. Here, the highly viscous liquid means a liquid having a viscosity that does not substantially leak from between the display sub-panels.
[0016]
In one embodiment, each display sub-panel has a display layer sandwiched between a pair of flexible substrates. The display layer includes a display medium and a seal wall provided so as to surround the display medium so as to enclose the display medium.
[0017]
The seal wall may be bonded to the pair of substrates, and a part of the seal wall may be set to have a larger adhesive force with the substrate than the other portions. When the display sub-panel is bent, a shearing force acts on the seal wall. By increasing the adhesive force of the seal wall portion at which the shearing force is maximized, the seal wall can be prevented from breaking.
[0018]
A curved display device according to the present invention includes a display panel formed by laminating a plurality of flexible display sub-panels via an adhesive layer having a fluid, and an exterior that covers the display panel in a curved state. And a member.
[0019]
You may make it provide the control area | region which controls the relative position of the surface direction of display subpanels in a part between display subpanels. Thereby, it is possible to substantially prevent positional deviation between the display sub-panels that are curved and held in the exterior member.
[0020]
When the display panel is bent and placed in the exterior member, the relative position of the display sub-panel is slightly shifted in the area other than the restriction area. However, this deviation can be achieved by providing the restriction area in the top area of the curved display panel. Can be minimized.
[0021]
In the display device according to the present invention, the restriction area may be provided outside the display portion of each display sub-panel so as not to hinder display.
[0022]
In one embodiment, the fluid is also filled in a region surrounded by an exterior member. This avoids the problem of fluid leaking between the display sub-panels, and widens the choice of fluid to be used.
[0023]
In one embodiment, each display sub-panel has a display layer sandwiched between a pair of flexible substrates. The display layer includes a display medium and a seal wall provided so as to surround the display medium so as to enclose the display medium.
[0024]
In one embodiment, the display panel is rectangular and curved so as to form a quadratic curved surface or a cubic curved surface. Correspondingly, the seal wall is formed in a frame shape, and the seal wall is the pair of substrates. And glued. Here, the quadric surface refers to a curved surface having a curvature of zero in a predetermined surface direction. A cubic curved surface refers to a curved surface having a curvature in any direction along the surface. In this case, regarding the seal wall portion on the end portion side having a large curvature radius, the adhesive force with the substrate may be set larger than that on the end portion side having a small curvature radius. When the display sub-panel is bent, a shearing force is applied to the seal wall. By increasing the adhesive force of the seal wall part on the end side where the radius of curvature is the largest, the seal wall Breaking can be prevented.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0026]
1 and 2 show a display device according to an embodiment of the present invention. In FIG. 1 showing a schematic external view, the display device 20 is convex toward the observation side and is formed in a quadric surface shape. ing. As shown in FIG. 2A, the display device 20 sandwiches the display layer 23 (23A, 23B, 23C) between a pair of film substrates 21 (21A, 21B, 21C) and 22 (22A, 22B, 22C). A display panel 26 in which at least three display elements 24 (24A, 24B, 24C) (hereinafter referred to as display subpanels) are stacked is provided. These display sub-panels 24A, 24B, and 24C are laminated using a liquid application / lamination device 27 (see FIG. 3) via an adhesion layer 28 made of a highly viscous liquid (details will be described later). The display panel 26 is planar before being placed on the display device 20, and is curved in the upper and lower covers 29 and 30 that form the appearance of the convex display device 20 toward the observation side. Is held by. In the form shown in the figure, the upper cover 29 has an opening corresponding to the display area 31, but instead covers the area including the display area 31 with, for example, an acrylic resin that is a transparent material. Also good. Further, the entire apparatus including the display area 31 may be entirely covered with a transparent material, and a frame may be formed on a portion corresponding to the periphery of the display area 31 by printing.
[0027]
Each display sub-panel 24A, 24B, 24C is a display medium between a pair of film substrates made of a resin material (for example, polycarbonate, polyethersulfone, etc.), for example, similar to that shown in FIG. A display layer having a liquid crystal and a spacer may be sandwiched. Each display subpanel 24 is provided with a seal wall 33 so as to surround the display section 32 as shown in FIG. 2B which is a plan view of each display subpanel 24. It should be noted that the resin structure that adheres and supports both substrates may be arranged in the display area according to a predetermined rule. In this way, the gap between the substrates becomes more constant, and problems such as substrate peeling due to bending of the display sub-panel can be suppressed.
[0028]
3A to 5G are process diagrams showing an example of a method for manufacturing the display device 20 according to the present invention.
[0029]
As best shown in FIGS. 3A and 3B, the liquid application / laminating apparatus 27 includes a flat plate 34 that sucks and fixes the display sub-panel 24 by negative pressure, and an application unit 35 disposed above the flat plate 34. And have. The flat plate 34 has a plurality of suction holes 36 on the surface on which the display sub-panel 24 is placed. These suction holes 36 are all in communication within the flat plate 34, and are further connected to the vacuum pump 40 via an electromagnetic valve 38. ing.
[0030]
The applicator 35 includes an oil pan 44 that contains the highly viscous liquid 42, a supply roller 46, a regulating blade 48 that is disposed so that its tip is close to or in contact with the outer peripheral surface of the supply roller 46, and close to the supply roller 46. A coating roller 50 having an axis (not shown) parallel to the surface of the flat plate 34. The height of the shaft of the application roller 50 with respect to the flat plate 34 is adjusted so that the distance between the upper surface of the display sub panel 24 and the outer peripheral surface of the application roller 50 becomes a predetermined value in a state where the display sub panel 24 is placed on the flat plate 34. It is possible. The lower part of the supply roller 44 is positioned below the liquid surface of the highly viscous liquid 42 in the oil pan 44. The application part 35 is slidable in the direction 52 in the figure in parallel with the surface of the flat plate 34. The shafts (not shown) of the supply roller 46 and the application roller 50 are drivingly connected to a motor (not shown) so as to be able to rotate in the direction of the arrow in the drawing.
[0031]
When the supply roller 46 is rotated in the coating unit 35 having the above configuration, the liquid 42 adhering to the outer peripheral surface of the supply roller 46 reaches the regulating blade 48 while being carried on the supply roller 46, and there is excess liquid there. 28 is removed by the regulating blade 48, and a uniform thin layer having a desired film thickness is formed. Thereafter, the further rotation of the supply roller 46 causes the thin layered liquid 42 to be conveyed to a region facing the application roller 50, where it is transferred to the outer peripheral surface of the application roller 50. Then, the liquid 42 on the outer peripheral surface of the application roller 50 is supplied to the display sub-panel 24 surface.
[0032]
The application portion 35 can be retracted from the flat plate 34. Instead, as shown in FIG. 4D, the pressing portion 53 can be disposed above the flat plate 34 so as to be retractable. The pressing portion 53 includes a pressing roller 54 having an axis above the flat plate 34 and parallel to the surface of the flat plate 34. The pressing roller 54 is slidable in a direction 56 in the drawing parallel to the surface of the flat plate 34. The height of the shaft of the pressing roller 54 with respect to the flat plate 34 can be adjusted.
[0033]
The pressing portion 53 has a holding member 58, and this holding member 58 is for lifting and holding one end of the upper display subpanel that is superimposed on the lower display subpanel fixed on the flat plate 34. The holding member 58 is configured to moderately pull one end of the display subpanel so that the upper display subpanel does not sag. Air bubbles are prevented from being taken in between the display sub-panels by overlapping the display sub-panels to be superimposed while lifting one end (that is, bending the display sub-panel).
[0034]
In the stacking operation of the display sub-panels, first, the first display sub-panel 24A is arranged at a predetermined position on the flat plate 34, and the first display sub-panel 24A is sucked and fixed on the flat plate 34 by opening the electromagnetic valve 38 [FIG. 3 (a)].
[0035]
Next, the highly viscous liquid 42 is applied onto the upper substrate 21A of the first display sub-panel 24A while sliding the application part 35 in the direction of the arrow 52 [FIG. 3 (b)]. The application needs to be performed on at least the upper substrate 21A corresponding to the display unit 32 [FIG. 2B] so that the visibility of the image becomes equal in the display region 31 (FIG. 1). Further, the coating is not performed on the entire surface of the upper substrate 21A of the first display sub-panel 24A, but on the upper substrate 21A, as described later, the upper substrate 21A of the first display sub-panel and the second display sub-panel 24B. An area for adhering a part of the lower substrate 22B is left. In this embodiment, the application unit 35 is moved relative to the flat plate 34. Instead, the position of the application unit 35 is fixed and the flat plate 34 is moved in the direction opposite to the arrow 52, or the flat plate 34 is moved. It is also possible to adopt a configuration in which both 34 and the application part 35 are moved in opposite directions.
[0036]
Subsequently, the other end of the second display sub-panel 24B and the other end of the first display sub-panel 24A are temporarily aligned using appropriate fixing means such as a fixing tape 60 [FIG. 3 (c)].
[0037]
In FIG. 4D, the pressing roller 54 is slid in the direction of the arrow 56 in a state where the one end of the second display sub-panel 24B is held by the holding member 58. The first and second display sub-panels 24A and 24B are overlapped while sequentially rotating the second display sub-panel 24B against the first display sub-panel 24A. In this embodiment, the pressing roller 54 is moved with respect to the flat plate 34. Instead, the position of the pressing roller 54 is fixed and the flat plate 34 is moved in the direction opposite to the arrow 56, or the flat plate 34 is moved. Both 34 and the pressure roller 54 may be configured to move in opposite directions.
[0038]
Since the first display sub-panel 24A and the second display sub-panel 24B are in a state where they are merely stacked via the adhesion layer 28 made of the liquid 42 without being bonded, the relative positions of the display sub-panels 24A and 24B with respect to the surface direction Can be changed. Therefore, after laminating the first and second display sub-panels 24A and 24B in the step shown in FIG. 4D, the fixing tape 60 is removed [FIG. 4E], and each display sub-panel 24A and 24B is provided in advance. Based on the alignment mark for alignment, the second display sub-panel 24B is shifted in the surface direction to perform exact alignment of the display sub-panels 24A and 24B.
[0039]
As described above, after the two display sub-panels are temporarily aligned, it is only necessary to perform the exact alignment. Therefore, the two display sub-panels are strictly aligned via the non-fluid adhesive sheet. (Ie, the first display sub-panel 6A is accurately arranged at a predetermined reference position on the flat plate 34, and the second display sub-panel 6B is accurately arranged at a predetermined reference position. This has the advantage that the structure of the stacking apparatus can be simplified compared to the case where two display sub-panels need to be bonded together.
[0040]
The alignment mark may be printed in advance on the substrate of each display subpanel, or may be displayed by applying a voltage to a predetermined electrode provided on each display subpanel. In the latter case, in order to display the alignment mark, it is not necessary to separately provide an electrode dedicated to the alignment mark, and an image display electrode (corresponding to the upper and lower electrodes 16 and 18 in FIG. 8) may be used. That is, as shown in FIG. 4F, which is a plan view of each display sub-panel 24, alignment marks 62 may be displayed at least at two corner regions on the diagonal line of the display section 32 of each display sub-panel 24. Based on the mark, the display sub-panels 24 can be strictly aligned with each other.
[0041]
If the vicinity of the outer periphery of the display unit 32 of each display sub-panel 24 is accurately aligned, it can be considered that the display sub-panels 24 are accurately aligned over the entire display unit 32. It is preferable to display near the outer periphery of the display unit 32 as described above.
[0042]
The first and second display sub-panels 24A and 24B that have been accurately aligned in this way are curved into a quadratic curved surface when placed on the display device 20, but the display sub-panels are in close contact with each other without being bonded. Therefore, the relative position in the surface direction of the first and second display sub-panels 24A and 24B cannot be maintained. Therefore, it is necessary to regulate the relative position in the surface direction of the display sub-panels 24A and 24B.
[0043]
Specifically, when the display sub-panels 24A and 24B are curved into a quadratic curved surface, the top is formed between the upper substrate 21A of the first display sub-panel 24A and the lower substrate 22B of the second display sub-panel 24B. Adhering in the region 64 where the adhesion layer 28 is not interposed (that is, in the vicinity of the center of the end surface of the display sub-panel that is curved in a state where the display sub-panels 24A and 24B are curved in a quadratic curved surface) [ As shown in FIG. 4 (e) and FIG. 5 (g)]. For example, an ultraviolet curable resin is injected into the adhesion region 64 on the end face of the display sub-panel using an injector having a thin nozzle such as a syringe, and the resin is cured by irradiating ultraviolet rays. As an ultraviolet irradiation method, for example, ultraviolet rays may be directly irradiated from the ultraviolet lamp to the bonding region 64 of the display sub-panel end face, or ultraviolet rays emitted from the ultraviolet lamp may be incident on one end of the optical fiber and the other end of the optical fiber may be irradiated. The adhesive region 64 may be irradiated with ultraviolet rays in a spot shape.
[0044]
Next, with respect to the first and second display sub-panels 24A and 24B arranged on the flat plate 34, the third display sub-panel 24C is made in the same manner as the steps shown in FIGS. 3B to 5G. The display panel 26 is manufactured by stacking.
[0045]
If a light-absorbing layer is required, this light-absorbing layer can be painted black after or before stacking the display subpanel farthest from the viewing side, or as the substrate behind the display subpanel farthest from the viewing side. It can be provided by a method such as using a black one.
[0046]
The display panel 26 composed of the display sub-panels 24A, 24B, and 24C stacked in this manner is removed from the flat plate 34 by closing the solenoid valve 38, and set in the upper and lower covers 29 and 30 shown in FIG. To do. At this time, there is a difference in circumference between the display subpanels 24. However, as shown in FIG. 5H, the display subpanels 24A, 24B, and 24C are curved into a quadratic curved surface, and the end surfaces on the curved side are displayed. Since it is fixed by an adhesive (ultraviolet curable resin) 66 in the vicinity of the center, the display sub-panels 24A, 24B, and 24C are shifted evenly around the adhesive region 64 to form a curved display panel. Since the adhesive region 64 is provided in the top region of the display panel 26, this deviation can be minimized.
[0047]
The high-viscosity liquid 42 has a viscosity that does not leak from between the display sub-panels 24 due to long-term use of the display device, and has a light-transmitting property that does not interfere with the display of the display sub-panel 24. These are selected in consideration of matching with the refractive index of the film substrates 21 and 22 of the display sub-panel 24 (and the refractive index of the coating film when a coating film is provided on the film substrate for the purpose of gas barrier or the like). As such a liquid, for example, various oils such as silicone oil and Teflon oil, and resin materials such as siloxane oligomer, acrylic monomer, and acrylic oligomer are preferably used.
[0048]
As an example, a polycarbonate resin (refractive index of the coating film: about 1, 5) as the material of the film substrates 21 and 22, and an oil made by Nikon as a highly viscous liquid (trade name: immersion oil, refractive index: 1,515) And the liquid application amount is 1 mg / cm ² A display panel was produced as described above. At this time, the thickness of each adhesion layer of the display panel was about 10 μm. Thus, according to the present invention, it is possible to make the display panel thinner than in the case where each display sub-panel is bonded via an adhesive sheet (for example, a thickness of about 25 μm).
[0049]
The above description relates to an embodiment of the present invention, and the present invention can be variously modified. For example, referring to FIG. 5G, the seal wall 33 encloses the liquid crystal and bonds the two film substrates of each display sub-panel 24 of the display device. For this reason, when the display panel composed of a plurality of display sub-panels is curved into a quadratic curved surface in a state where the display panel is disposed in the exterior member (upper and lower covers), the seal wall 33 has a peripheral length of two film substrates. Shear force is received due to the difference. The shearing force becomes maximum at the straight side end face of the display sub-panel, and the sealing wall may break and the liquid crystal may flow out. Therefore, as shown in FIG. 6, in each display sub-panel 24 ′, the width W of the seal wall 33 ′ in the vicinity of the straight-side end surface. ₁ Is the width W of the seal wall 33 ′ in the vicinity of the curved side end face ₂ It is preferable to increase the adhesive strength between the seal wall and the film substrate in the vicinity of the straight side end surface, for example, by making it wider, thereby preventing the seal wall from being broken.
[0050]
Further, the adhesion layer for closely adhering the display sub-panels may have a spacer together with the highly viscous liquid. Thereby, even if the liquid leaks slightly due to the use of the display device for a long time at the edge of the adhesion layer, it is possible to prevent the visibility from changing due to the change in the thickness of the adhesion layer.
[0051]
Further, as shown in FIG. 7, the upper and lower covers 29 ′ and 30 ′, which are exterior members, completely seal the display panel 26 ′ (the portion 70 corresponding to the display area as the upper cover 29 ′ is transparent). The exterior member may be filled with a liquid 42 ′ that closely contacts the display sub-panels. By doing in this way, the problem of liquid leaking between display sub-panels can be avoided, and the range of selection of the liquid to be used is expanded.
[0052]
In addition, the material used for the adhesion layer for adhering the display sub-panel is not limited to the high-viscosity liquid described above, but a low-viscosity liquid, a liquid in which a solid is dispersed in a sol or the like using a liquid as a dispersion medium, or a jelly-like gel Further, it may be a solid or semi-solid substance such as a grease-like substance. For example, a gel such as a silicon gel or an acrylic gel can be used.
[0053]
In addition to the convex curved surface having a convex display surface as in the above embodiment, the display surface may be a concave curved surface having a concave surface.
[0054]
【The invention's effect】
According to the present invention, strain energy generated when each display sub-panel expands and contracts depending on environmental conditions such as temperature and humidity can be absorbed by the adhesion layer between the display sub-panels. The sub panel can be prevented from being damaged, and thus the durability of the display panel is improved. Further, such a display panel can be curved into a predetermined shape. Furthermore, a durable curved display device can be provided using such a bendable display panel.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a display device according to the present invention.
FIG. 2A is a cross-sectional view showing a multilayer display panel according to the present invention. (B) The top view which shows each display subpanel which comprises a display panel.
FIG. 3 is a process chart showing an example of a method for manufacturing a display panel according to the present invention.
FIG. 4 is a process chart showing an example of a method for manufacturing a display panel according to the present invention.
FIG. 5 is a process chart showing an example of a method for manufacturing a display panel according to the present invention.
FIG. 6 is a top view showing a modified example of each display sub-panel constituting the display panel.
FIG. 7 is a cross-sectional view showing another embodiment of the display device according to the present invention.
FIG. 8 is a detailed enlarged partial cross-sectional view of a liquid crystal display device.
[Explanation of symbols]
, 20: display device, 21: film substrate, 22: film substrate, 23: display layer, 24: display sub-panel, 26: laminated display panel, 28: adhesion layer, 29: upper cover, 30: lower cover, 31 : Display area of display device, 32: Display part of each display sub-panel, 33: Seal wall, 35: Application part, 42: High viscosity liquid, 64: Adhesive area, 66: Adhesive layer.

Claims (16)

A display panel formed by laminating a plurality of flexible display sub-panels with an adhesive layer having a translucent fluid. The display panel according to claim 1, wherein a restriction region for restricting a relative position in a surface direction between the display sub-panels is provided in a part between the display sub-panels. 3. The display panel according to claim 2, wherein the display sub-panel is formed in a quadrangular shape, and the restriction region is provided in the vicinity of a line connecting the centers of two opposing sides. The display panel according to claim 2, wherein the restriction region is provided outside a display portion of each display sub-panel. The display panel according to claim 1, wherein the fluid includes a liquid. The display panel according to claim 1, wherein each display sub-panel has a display layer sandwiched between a pair of flexible substrates. The display panel according to claim 6, wherein the display layer includes a display medium and a seal wall provided so as to surround the display medium so as to enclose the display medium. 8. The display panel according to claim 7, wherein the seal wall is bonded to the pair of substrates, and a part of the seal wall is set to have a larger adhesive force with the substrate than the other portions. A curved display device comprising: a display panel formed by laminating a plurality of flexible display sub-panels via an adhesive layer having a fluid; and an exterior member that covers the display panel in a curved state. 10. The curved surface display device according to claim 9, wherein a restriction region for restricting a relative position in a surface direction between the display sub-panels is provided in a part between the display sub-panels. 11. The curved display apparatus according to claim 10, wherein the restriction area is provided in a top area of the display panel that is curved. The curved display apparatus according to claim 10 or 11, wherein the restriction region is provided outside a display portion of each display sub-panel. The curved surface display device according to claim 9, wherein a region surrounded by the exterior member is filled with the fluid. The display curved surface type device according to claim 9, wherein each display sub-panel has a display layer sandwiched between a pair of flexible substrates. The curved display device according to claim 14, wherein the display layer includes a display medium and a seal wall provided so as to surround the display medium so as to enclose the display medium. The display panel is rectangular and curved so as to form a secondary curved surface or a cubic curved surface, and a seal wall is formed in a frame shape correspondingly, and the seal wall is bonded to the pair of substrates.
16. The curved surface display device according to claim 15, wherein the seal wall portion on the end portion side having a large curvature radius is set to have a larger adhesive force with the substrate than the seal wall portion on the end portion side having a small curvature radius. .

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