Curved liquid crystal panel and manufacturing method for curved liquid crystal panel

Abstract

Disclosed is a curved liquid crystal panel and a manufacturing method for a curved liquid crystal panel. The curved liquid crystal panel includes a first substrate curved in a first direction, a second substrate curved in the first direction and facing the first substrate, a liquid crystal sandwiched between the first substrate and the second substrate, a first seal adhering the first substrate and the second substrate to each other and sealing the liquid crystal, and a second seal surrounding a periphery of the first seal. A force of the second seal adhering the first substrate and the second substrate to each other is weaker than a force of the first seal adhering the first substrate and the second substrate to each other.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Japanese Patent Application No. 2020-209796, filed on December 18, 2020, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to a curved liquid crystal panel and a method for manufacturing a curved liquid crystal panel. Background Technology

[0004] There is a need for display devices with shapes that correspond to the installation location and the design of the device in which the display device will be installed. To meet this need, liquid crystal display devices with curved display surfaces have been developed. For example, unexamined Japanese Patent Application Publication No. 2017-181821 discloses an in-vehicle device that includes a curved display and a main body for attaching the curved display to the vehicle.

[0005] A curved display disclosed in unexamined Japanese Patent Application Publication No. 2017-181821 includes a first substrate bent in a first direction, a second substrate bent in the first direction and disposed facing the first substrate, and a sealing material for adhering the first and second substrates to each other. The sealing material includes a first seal extending in a second direction orthogonal to the first direction and a second seal extending in the first direction. In unexamined Japanese Patent Application Publication No. 2017-181821, the width of the first seal in the first direction is configured to be greater than the width of the second seal in the second direction, thereby suppressing stress concentration in the first and second substrates and reducing light leakage occurring near the four corners of the display surface.

[0006] In unexamined Japanese Patent Application Publication No. 2017-181821, shear stress (torsion applied to the sealing material due to the bending of the stacked first and second substrates) continuously acts on the sealing member. Therefore, the sealing material is more prone to degradation, and air bubbles may enter the liquid crystal from outside the sealing material.

[0007] The purpose of this disclosure is to provide a curved liquid crystal panel that suppresses shear stress acting on a sealant that adheres substrates to each other and seals liquid crystals, and a method for manufacturing the curved liquid crystal panel. Summary of the Invention

[0008] To achieve the above objectives, the curved liquid crystal panel according to the first aspect of this disclosure includes:

[0009] A first substrate, which is bent in a first direction;

[0010] a second substrate that is curved in the first direction and faces the first substrate;

[0011] a liquid crystal that is sandwiched between the first substrate and the second substrate;

[0012] a first sealant that adheres the first substrate and the second substrate to each other and seals the liquid crystal; and

[0013] a second sealant that surrounds a periphery of the first sealant; wherein

[0014] a force of the second sealant that adheres the first substrate and the second substrate to each other is weaker than a force of the first sealant that adheres the first substrate and the second substrate to each other.

[0015] The manufacturing method for a curved liquid crystal panel according to the second aspect includes:

[0016] forming a first sealant that seals the liquid crystal on the first substrate or the second substrate;

[0017] forming a second sealant that surrounds a periphery of the first sealant on one of the first substrate and the second substrate on which the first sealant is formed;

[0018] stacking the other of the first substrate and the second substrate on one of the first substrate and the second substrate on which the first sealant and the second sealant are formed;

[0019] curing the second sealant and adhering the first substrate and the second substrate to each other;

[0020] curving the first substrate and the second substrate adhered to each other in the first direction;

[0021] weakening a force of the second sealant that adheres the first substrate and the second substrate to each other in a state in which the first substrate and the second substrate are curved; and

[0022] curing the first sealant in the state in which the first substrate and the second substrate are curved, wherein

[0023] the weakened force of the second sealant that adheres the first substrate and the second substrate to each other is weaker than a force of the cured first sealant that adheres the first substrate and the second substrate to each other.

[0024] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0025] According to the present disclosure, a shear stress acting on a sealant that adheres substrates to each other and seals a liquid crystal can be inhibited. BRIEF DESCRIPTION OF DRAWINGS

[0026] A more complete understanding of the present application can be obtained by reference to the following detailed description when considered in connection with the following drawings, in which:

[0027] Figure 1 is a plan view of a curved liquid crystal panel according to Embodiment 1;

[0028] Figure 2 is Figure 1 is a cross-sectional view taken along line A-A of the curved liquid crystal panel shown in FIG. 1;

[0029] Figure 3 is a flowchart showing a manufacturing method for the curved liquid crystal panel according to Embodiment 1;

[0030] Figure 4 is a schematic view showing a first seal and a second seal formed on a first substrate according to Embodiment 1;

[0031] Figure 5 is a schematic view showing a first substrate and a second substrate stacked in a flat state according to Embodiment 1;

[0032] Figure 6 is a schematic view showing a first substrate and a second substrate in a curved state according to Embodiment 1;

[0033] Figure 7 is a schematic view showing a curved cover, a first substrate, and a second substrate according to Embodiment 1 pressed by an upper mold and a lower mold;

[0034] Figure 8 is a plan view of a curved liquid crystal panel according to Embodiment 2;

[0035] Figure 9 is a plan view of a curved liquid crystal panel according to Embodiment 3; and

[0036] Figure 10 is Figure 9 is a cross-sectional view taken along line B-B of the curved liquid crystal panel shown in FIG. 2. DETAILED DESCRIPTION

[0037] Hereinafter, a curved liquid crystal panel according to various embodiments will be described with reference to the accompanying drawings.

[0038] Embodiment 1

[0039] Referring to Figures 1 to 7 A curved liquid crystal panel 100 according to the present embodiment is described. As Figure 1 and Figure 2As shown, the curved liquid crystal panel 100 includes a curved cover 10 and a liquid crystal panel 20. The curved cover 10 is bent and supports the liquid crystal panel 20. The curved cover 10 and the liquid crystal panel 20 are adhered to each other by an adhesive layer 12. The liquid crystal panel 20 displays text, color images, etc., according to signals from a display controller (not shown) and a driving circuit (not shown). In this specification, for ease of understanding, a description is given in which... Figure 1 In the curved LCD panel 100, the rightward direction (rightward direction on the paper) is called the "+X direction", the upward direction (upward direction on the paper) is called the "+Y direction", and the direction perpendicular to the +X direction and the +Y direction (front direction on the paper) is called the "+Z direction".

[0040] A curved liquid crystal panel 100 and a backlight member disposed on the -Z side constitute a display device. The display device including the curved liquid crystal panel 100 is installed in electronic devices, vehicles, etc. Additionally, the display device including the curved liquid crystal panel 100 is used as a sign display.

[0041] The curved cover 10 of the curved liquid crystal panel 100 supports the liquid crystal panel 20 in a curved state via an adhesive layer 12. The curved cover 10 includes a first main surface 10a and a second main surface 10b that are curved in a first direction (the -Z direction in this embodiment). The radius of curvature of the first main surface 10a and the second main surface 10b is, for example, from 800 mm to 1200 mm. The curved cover 10 is formed of glass, a light-transmitting resin, or the like.

[0042] An adhesive layer 12 of the curved liquid crystal panel 100 is disposed on the first main surface 10a of the curved cover 10. The adhesive layer 12 adheres the liquid crystal panel 20 to the first main surface 10a of the curved cover 10. In one example, the adhesive layer 12 is implemented as an optically clear adhesive (OCA).

[0043] In one example, the liquid crystal panel 20 of the curved liquid crystal panel 100 is implemented as a transmissive liquid crystal panel driven by thin-film transistors (TFTs). The display surface (first polarizer 42, described later) of the liquid crystal panel 20 is adhered to the first main surface 10a of the curved cover 10 and is curved in the -Z direction.

[0044] like Figure 1 and Figure 2As shown, the liquid crystal panel 20 includes a first substrate 22, a second substrate 24, liquid crystal 26, a first sealing member 32, and a second sealing member 34. The liquid crystal panel 20 also includes a first polarizer 42 and a second polarizer 44. The first substrate 22 and the second substrate 24 sandwich the liquid crystal 26 between them. The first sealing member 32 and the second sealing member 34 adhere the first substrate 22 and the second substrate 24 to each other. The first polarizer 42 is adhered to the first substrate 22, and the second polarizer 44 is adhered to the second substrate 24. Note that, for ease of understanding, in... Figure 2 The cross-sectional lines of LCD 26 are omitted in the text.

[0045] In one example, the first substrate 22 of the liquid crystal panel 20 is implemented as a glass substrate. The first substrate 22 is bent in the -Z direction. The first substrate 22 includes a strip color filter, a black matrix, electrodes, alignment films, etc. (all not shown) on the surface 22a of the first substrate 22 that sandwiches the liquid crystal 26 together with the surface 24a of the second substrate 24. Additionally, a first polarizing plate 42 is adhered to the surface 22b on the side opposite to the surface 22a of the first substrate 22.

[0046] Similar to the first substrate 22, the second substrate 24 of the liquid crystal panel 20 is also a glass substrate. The second substrate 24 is also bent in the -Z direction. The second substrate 24 includes TFTs, wiring, electrodes, alignment films, etc. (all not shown) on the surface 24a of the second substrate 24 that clamps the liquid crystal 26 together with the surface 22a of the first substrate 22. Additionally, a second polarizing plate 44 is adhered to the surface 24b opposite to the surface 24a of the second substrate 24. The first substrate 22 and the second substrate 24 are adhered to each other at a predetermined interval (cell gap) via the first sealing member 32 and the second sealing member 34.

[0047] like Figure 2 As shown, the liquid crystal 26 of the liquid crystal panel 20 is sandwiched between the first substrate 22 and the second substrate 24. The liquid crystal 26 is a nematic liquid crystal, and the liquid crystal panel 20 operates in twisted nematic (TN) mode.

[0048] A first sealing member 32 of the liquid crystal panel 20 is disposed between the first substrate 22 and the second substrate 24, and adheres the first substrate 22 and the second substrate 24 to each other. Additionally, the first sealing member 32 seals the liquid crystal 26 sandwiched between the first substrate 22 and the second substrate 24.

[0049] like Figure 1As shown, the first seal 32 has a frame-like shape. The first seal 32 is formed along the outer shape of the first substrate 22 and the second substrate 24. In one example, the first seal 32 is formed of an ultraviolet (UV) curable adhesive. As described later, the first seal 32 is cured in a state where the first substrate 22 and the second substrate 24 are bent. Thus, a shear stress caused by the bending of the first substrate 22 and the second substrate 24 can be suppressed from acting on the first seal 32. Since the shear stress acting on the first seal 32 can be suppressed, deterioration of the first seal 32 can be suppressed. In addition, since the deterioration of the first seal 32 can be suppressed, entry of air bubbles from the outside into the liquid crystal 26 due to a decrease in the adhesive strength of the first seal 32 can be suppressed.

[0050] Like the first seal 32, the second seal 34 of the liquid crystal panel 20 adheres the first substrate 22 and the second substrate 24 to each other. The second seal 34 has a frame-like shape. The second seal 34 surrounds the periphery of the first seal 32. In one example, the second seal 34 is formed of a detachable adhesive. The detachable adhesive is an adhesive whose adhesive strength decreases due to light irradiation, heat, or the like. Examples of the detachable adhesive include a light fusion adhesive, a heat fusion adhesive, and the like. Another example of the detachable adhesive is a UV releasable type adhesive (COPONYL) (registered trademark) manufactured by Mitsubishi Chemical Corporation.

[0051] As described later, the second seal 34 is cured in a state where the first substrate 22 and the second substrate 24 are flat. The second seal 34 maintains the adhered state of the first substrate 22 and the second substrate 24 until the first substrate 22 and the second substrate 24 are bent. Additionally, in a state where the first substrate 22 and the second substrate 24 are bent, the force of the second seal 34 that adheres the first substrate 22 and the second substrate 24 to each other is weaker than the force of the first seal 32 that adheres the first substrate 22 and the second substrate 24 to each other. In the present embodiment, the force of the second seal 34 that adheres the first substrate and the second substrate to each other is weaker than the force of the first seal 32 that adheres the first substrate and the second substrate to each other due to release, softening, liquefaction, rupture, or the like of the second seal 34. Hereinafter, the force that adheres the first substrate and the second substrate to each other is referred to as an "adhesion force".

[0052] A first polarizing plate 42 of the liquid crystal panel 20 is adhered to a surface 22b of the first substrate 22. Additionally, the first polarizing plate 42 is adhered to the first major surface 10a of the curved cover 10 via the adhesive layer 12. A second polarizing plate 44 of the liquid crystal panel 20 is adhered to a surface 24b of the second substrate 24.

[0053] Next, a manufacturing method for the curved liquid crystal panel 100 is described. Figure 3is a flowchart showing a manufacturing method of the curved liquid crystal panel 100. The manufacturing method for the curved liquid crystal panel 100 includes preparing a first substrate 22 and a second substrate 24 (step S10); forming a first seal 32 that seals liquid crystal 26 on one of the first substrate 22 and the second substrate 24 (step S12); forming a second seal 34 that surrounds a periphery of the first seal 32 on the one of the first substrate 22 and the second substrate 24 on which the first seal 32 is formed (step S14); dropping the liquid crystal 26 in an area surrounded by the first seal 32 (step S16); and stacking the one of the first substrate 22 and the second substrate 24 on which the first seal 32 and the second seal 34 are formed on the other of the first substrate 22 and the second substrate 24 (step S18).

[0054] The manufacturing method for the curved liquid crystal panel 100 further includes curing the second seal 34 to adhere the first substrate 22 and the second substrate 24 to each other (step S20); adhering a first polarizing plate 42 to the first substrate 22 (step S22); bending the first substrate 22 and the second substrate 24 adhered to each other in a first direction (-Z direction) (step S24); weakening, in a state where the first substrate 22 and the second substrate 24 are bent, a force of the cured second seal 34 that adheres the first substrate 22 and the second substrate 24 to each other (step S26); curing the first seal 32 in a state where the first substrate 22 and the second substrate 24 are bent (step S28); and adhering a second polarizing plate 44 to the second substrate 24 (step S30).

[0055] In step S10, a glass substrate on which a color filter, a black matrix, and the like are formed (so-called color filter substrate) is prepared as the first substrate 22. Additionally, a glass substrate on which a TFT, a wiring, and the like are formed (so-called TFT substrate) is prepared as the second substrate 24.

[0056] In step S12, a UV curable resin is coated on the surface 22a of the first substrate 22 using a dispenser, thus forming the first seal 32 that seals the liquid crystal 26. Note that the UV curable resin includes spacers to maintain a cell gap. Next, in step S14, a UV releasable type adhesive is coated on the surface 22a of the first substrate 22 on which the first seal 32 is formed using a dispenser, thus forming the second seal 34 that surrounds a periphery of the first seal 32. As a result, as shown in Figure 4 the first seal 32 and the second seal 34 are formed on the first substrate 22.

[0057] Returning to Figure 3 In step S16, the liquid crystal 26 is dropped in an area of the surface 22a of the first substrate 22 surrounded by the first seal 32. Then, in step S18, the one of the first substrate 22 and the second substrate 24 on which the first seal 32 and the second seal 34 are formed is stacked on the other of the first substrate 22 and the second substrate 24. Figure 5As shown, the heated upper surface plate 82 and lower surface plate 84 are used to stack the second substrate 24 on the first substrate 22 on which the liquid crystal 26 is dropped in a flat state.

[0058] Returning to Figure 3 In step S20, the second sealant 34 is cured, thereby adhering the first substrate 22 and the second substrate 24 in a flat state to each other. Thus, the second sealant 34 is cured in a state in which the first substrate 22 and the second substrate 24 are flat.

[0059] Next, in step S22, the first polarizing plate 42 is adhered to the surface 22b of the first substrate 22. Then, in step S24, the first polarizing plate 42 is adhered to the first major surface 10a of the curved cover 10 via the adhesive layer 12, thereby bending the first substrate 22 and the second substrate 24 adhered to each other in the first direction (-Z direction). As shown, Figure 6 As shown, the first substrate 22 and the second substrate 24 adhered to each other are bent in the -Z direction along the first major surface 10a of the curved cover 10.

[0060] In step S26, first, as shown, Figure 7 the first substrate 22 and the second substrate 24 adhered to the curved cover 10 are pressed using the upper mold 86 and the lower mold 88, and the bent state of the first substrate 22 and the second substrate 24 is maintained. Here, the openings 92, 94 are provided in the lower mold 88 so as to irradiate UV light on the first sealant 32 and the second sealant 34. Additionally, the curved cover 10 contacting the upper mold 86 and the second substrate 24 contacting the lower mold 88 are sucked to the respective molds.

[0061] Next, the adhesion of the cured second sealant 34 is weakened by irradiating UV light on the cured second sealant 34 through the opening 94. In this case, the weakened adhesion of the second sealant 34 is made weaker than the adhesion of the cured first sealant 32. In the present embodiment, because the second sealant 34 is formed of a UV releasable type adhesive, the second sealant 34 is released from the first substrate 22 and the second substrate 24 due to the irradiation by the UV rays.

[0062] In the present embodiment, the adhesion of the second sealant 34 cured in a state in which the first substrate 22 and the second substrate 24 are flat is weakened, and thereby, the stress applied to the bent first substrate 22 and the second substrate 24 can be suppressed.

[0063] Returning to Figure 3In step S28, UV light is irradiated on the first sealant 32 through the opening 92, thereby curing the first sealant 32 in the state where the first substrate 22 and the second substrate 24 are bent. As a result, the shear stress caused by the bending of the first substrate 22 and the second substrate 24 can be suppressed from acting on the first sealant 32. In addition, the deterioration of the first sealant 32 can be suppressed, and the entry of air bubbles from the outside into the liquid crystal 26 caused by the weakening of the adhesion strength of the first sealant 32 can be suppressed.

[0064] In step S30, the bent cover 10 and the second substrate 24 are removed from the upper mold 86 and the lower mold 88, respectively, and then, the second polarizing plate 44 is adhered to the surface 24b of the second substrate 24. Thus, the bent liquid crystal panel 100 can be manufactured.

[0065] As described above, the adhesion of the second sealant 34 cured in the state where the first substrate 22 and the second substrate 24 are flat is weaker than the adhesion of the first sealant 32 cured in the state where the first substrate 22 and the second substrate 24 are bent. Thereby, the shear stress caused by the bending of the first substrate 22 and the second substrate 24 can be suppressed from acting on the first sealant 32. Additionally, the stress acting on the bent first substrate 22 and the second substrate 24 can be suppressed.

[0066] Embodiment 2

[0067] In Embodiment 1, the second sealant 34 has a frame-like shape. The second sealant 34 can have any shape. It is enough that the second sealant 34 keeps the state where the first substrate 22 and the second substrate 24 are adhered to each other until the first substrate 22 and the second substrate 24 are bent.

[0068] As Figure 8 shown, the bent liquid crystal panel 100 of the present embodiment includes a plurality of separate second sealants 34a to 34d. Each of the second sealants 34a to 34d is formed in a rectangular shape. The second sealants 34a to 34d are arranged at the periphery of the first sealant 32, surrounding the first sealant 32. The other configurations of the bent liquid crystal panel 100 of the present embodiment are the same as those of the bent liquid crystal panel 100 of Embodiment 1.

[0069] As with the bent liquid crystal panel 100 of Embodiment 1, in the bent liquid crystal panel 100 of the present embodiment, the adhesion of the second sealant 34 is made weaker than the adhesion of the first sealant 32, and thereby, the shear stress caused by the bending of the first substrate 22 and the second substrate 24 can be suppressed from acting on the first sealant 32. Additionally, the stress acting on the bent first substrate 22 and the second substrate 24 can be suppressed.

[0070] Embodiment 3

[0071] In Embodiment 1 and Embodiment 2, the curved liquid crystal panel 100 includes the first seal 32 and the second seal 34. However, a configuration in which the curved liquid crystal panel 100 includes another seal is possible.

[0072] The curved liquid crystal panel 100 of the present embodiment includes a third seal 36. The other configuration of the curved liquid crystal panel 100 of the present embodiment is the same as that of the curved liquid crystal panel 100 of Embodiment 1.

[0073] The third seal 36 adheres the first substrate 22 and the second substrate 24 to each other. As shown in Figs. 6A and 6B, the third seal 36 is positioned on the ridge line M of the curve of the first substrate 22 or the second substrate 24 when viewed from above, and is disposed outside the second seal 34. Figure 9 and Figure 10 In the present embodiment, the third seal 36 is disposed at a position of 1 / 2 of the curved side length of the second seal 34. Due to this configuration, the first substrate 22 and the second substrate 24 can be curved without being obstructed by the third seal 36. It is preferable that the adhesion of the third seal 36 be stronger than that of the first seal 32. It is desirable to select an adhesive that does not have a detachable property (an adhesive that is not a detachable adhesive) or does not require the same process as the chemical reaction process related to the curing of the first seal 32 as the adhesive that forms the third seal 36. For example, a heat-curable epoxy resin, a solvent volatilization type rubber glue, a curing agent mixed type two-component mixed epoxy resin, a hot melt type styrene-butadiene rubber, a pressure-sensitive acrylic resin, or the like can be used as the third seal 36.

[0074] In the manufacturing method for the curved liquid crystal panel 100 of Embodiment 1, the formation of the third seal 36 is performed between the preparation of the first substrate 22 and the second substrate 24 (step S10) and the stacking of the second substrate 24 on the first substrate 22 (step S18). The third seal 36 is cured (step S24) before the first substrate 22 and the second substrate 24 are curved in the -Z direction.

[0075] In the present embodiment, since the third seal 36 positioned on the ridge line M of the curve adheres the first substrate 22 and the second substrate 24 to each other before the first substrate 22 and the second substrate 24 are curved, a positional deviation between the first substrate 22 and the second substrate 24 due to the curvature can be suppressed. Additionally, as in Embodiment 1, a shear stress caused by the curvature of the first substrate 22 and the second substrate 24 can be suppressed from acting on the first seal 32.

[0076] Modified Examples

[0077] Embodiments have been described, but various modifications can be made to the present disclosure without departing from the spirit and scope of the present disclosure.

[0078] The liquid crystal panel 20 of Embodiment 1 is a transmissive liquid crystal display panel, but a configuration in which the liquid crystal panel 20 is a reflective liquid crystal panel is possible. Additionally, the liquid crystal panel 20 in Embodiment 1 operates in a TN mode, but a configuration in which the liquid crystal panel 20 operates in a vertical alignment (VA) mode, a fringe field switching (FFS) mode, or the like is possible. Further, the liquid crystal panel 20 of Embodiment 1 is curved in the -Z direction, but a configuration in which the liquid crystal panel 20 is curved in the +Z direction is possible.

[0079] The liquid crystal panel 20 of Embodiment 1 is curved by being adhered to the curved cover 10. A configuration in which the liquid crystal panel 20 is curved by being pressed against the curved cover 10 is possible. Additionally, a configuration in which the liquid crystal panel 20 is curved by being fitted into a curved frame-like chassis is possible.

[0080] In Embodiment 1, the first substrate 22 includes a color filter, an electrode, an alignment film, and the like, and the second substrate 24 includes a TFT, a wiring, an electrode, an alignment film, and the like. However, a configuration in which the first substrate 22 includes a TFT, a wiring, an electrode, an alignment film, and the like and the second substrate 24 includes a color filter, an electrode, an alignment film, and the like is possible. Additionally, a configuration in which the first substrate 22 and the second substrate 24 are formed of a light-transmissive resin is possible.

[0081] In Embodiment 1, there is a gap between the first seal 32 and the second seal 34, but a configuration in which the first seal 32 and the second seal 34 are in contact with each other is possible. Additionally, the material of the second seal 34 is not limited to a detachable adhesive. The second seal 34 maintains the state in which the first substrate 22 and the second substrate 24 are adhered to each other until the first substrate 22 and the second substrate 24 become curved, and it is enough that the adhesion of the second seal 34 is weaker than the adhesion of the first seal 32.

[0082] A configuration in which the curved liquid crystal panel 100 of Embodiment 2 includes the third seal 36 of Embodiment 3 is possible.

[0083] In the manufacturing method for the curved liquid crystal panel 100 of Embodiment 1, the first seal 32 and the second seal 34 are formed on the first substrate 22, but a configuration in which the first seal 32 and the second seal 34 are formed on the second substrate 24 is possible. Additionally, the first seal 32 is cured after the adhesion of the second seal 34 is weakened, but a configuration in which the adhesion of the second seal 34 is weakened after the first seal 32 is cured is possible.

[0084] In the manufacturing method of the curved liquid crystal panel 100 for Embodiment 1, the liquid crystal 26 is dropped after the second seal 34 is formed, but it is enough that the liquid crystal 26 is dropped after the first seal 32 is formed and before the second substrate 24 is stacked on the first substrate 22.

[0085] In addition, a configuration in which the liquid crystal 26 is sealed in the region surrounded by the first seal 32 by injection is possible. In this case, the first seal 32 is formed with an injection port of an opening, the liquid crystal 26 is injected into the region surrounded by the first seal 32, and then, the injection port of the first seal 32 is sealed. It is enough that the step of injecting and sealing the liquid crystal 26 in the region surrounded by the first seal 32 is performed after the first substrate 22 and the second substrate 24 are adhered to each other and before the first substrate 22 and the second substrate 24 are curved.

[0086] For purposes of explanation, some example embodiments were described above. Although the foregoing discussion has presented specific embodiments, one skilled in the art will recognize that changes can be made in the form and details of the described embodiments without departing from the broader spirit and scope of the application. Thus, the described specification and drawings are to be regarded in an illustrative rather than a restrictive sense. The detailed description set forth above is not intended to be exhaustive or to be unduly restrictive. The detailed description set forth above is designed to enable practices of the present application and is presented by way of example only. What is claimed is what is set forth in the claims and equivalents thereto.

Claims

1.A curved liquid crystal panel comprising: a first substrate curved in a first direction; a second substrate curved in the first direction and facing the first substrate; a liquid crystal sandwiched between the first substrate and the second substrate; a first sealant adhering the first substrate and the second substrate to each other and sealing the liquid crystal; and a second sealant surrounding a periphery of the first sealant, wherein a force of the second sealant adhering the first substrate and the second substrate to each other is weakened in a state where the first substrate and the second substrate are curved, the force of the second sealant adhering the first substrate and the second substrate to each other is weaker than a force of the first sealant adhering the first substrate and the second substrate to each other, wherein the first sealant is cured in the state where the first substrate and the second substrate are curved in the first direction. 2.The curved liquid crystal panel according to claim 1, wherein the second sealant is divided into a plurality of sections. 3.The curved liquid crystal panel according to claim 1 or 2, wherein the second sealant is formed of a detachable adhesive. 4.The curved liquid crystal panel according to claim 1, further comprising: a third sealant disposed on a ridge line of a curve of the first substrate or the second substrate and disposed outside the second sealant when viewed from above, and adhering the first substrate and the second substrate to each other. 5.A manufacturing method for a curved liquid crystal panel, the manufacturing method comprising: forming a first sealant sealing a liquid crystal on a first substrate or a second substrate; on one of the first substrate and the second substrate on which the first sealant is formed, forming a second sealant surrounding a periphery of the first sealant; stacking one of the first substrate and the second substrate on which the first sealant and the second sealant are formed on the other of the first substrate and the second substrate; curing the second sealant and adhering the first substrate and the second substrate to each other; curving the first substrate and the second substrate adhered to each other in a first direction; weakening a force of the second sealant adhering the first substrate and the second substrate to each other in a state where the first substrate and the second substrate are curved; and curing the first sealant in the state where the first substrate and the second substrate are curved, wherein the weakened force of the second sealant adhering the first substrate and the second substrate to each other is weaker than a force of the cured first sealant adhering the first substrate and the second substrate to each other. 6.The manufacturing method for a curved liquid crystal panel according to claim 5, further comprising: between the forming the first sealant and the stacking, dropping the liquid crystal in an area surrounded by the first sealant. 7.The manufacturing method for a curved liquid crystal panel according to claim 5, further comprising: ​ ​ between said adhering and said bending, injecting and sealing said liquid crystal in the area enclosed by said first seal.

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