Display device

Abstract

A display device includes a front panel having a display region with light-transmitting property and a peripheral region different from the display region, and a display panel disposed opposite to at least the display region of the front panel, the front panel having a plurality of alignment marks provided in the peripheral region at positions corresponding to a plurality of display panel side alignment marks provided in the display panel, and a plurality of linear first marks extending along an outer periphery of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to a display device. BACKGROUND

[0002] A display device in which a display panel and a protective member are attached is described in Patent Literature 1. Reference marks for alignment are formed in the display panel and the protective member, respectively, and the reference marks of the display panel and the reference marks of the protective member are arranged in register. In addition, display devices in which a plurality of display panels are attached to one front panel (also referred to as a protective plate or a protective panel) are described in Patent Literatures 2 to 5.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: JP Patent Publication No. 2020-8758

[0006] Patent Literature 2: International Publication No. 2016 / 113908

[0007] Patent Literature 3: JP Patent Publication No. 2016-49934

[0008] Patent Literature 4: JP Patent Publication No. 2019-174764

[0009] Patent Literature 5: JP Patent Publication No. 2020-1223 SUMMARY

[0010] In such a display device, after the front panel is attached to the display panel, it can be difficult to confirm the positional accuracy of the display panel (whether or not misalignment is present). For example, in the display devices described in Patent Literatures 4 and 5, the front panel and the display panel are curved, and the distance between the alignment marks provided in the display panel and the alignment marks provided in the front panel can differ depending on the position or angle of observation using a camera (or a camera), resulting in an inability to accurately detect misalignment of the display panel.

[0011] An object of the present application is to provide a display device in which the positional accuracy of a display panel attached to a front panel can be easily confirmed.

[0012] The display device of one aspect of the present application includes a front panel having a display region that is transparent to light and a peripheral region that is different from the display region, and a display panel disposed opposite at least the display region of the front panel, the front panel having a plurality of alignment marks provided in the peripheral region at positions corresponding to a plurality of display panel-side alignment marks provided in the display panel, and a plurality of linear first marks extending along an outer periphery of the display panel.

[0013] The display device of one aspect of the present application includes a front panel having a curved surface portion, and display panels provided to the front panel and adhered along the front panel, the front panel having a plurality of alignment marks provided at positions corresponding to a plurality of display panel side alignment marks provided to the display panels, and a plurality of linear first marks provided along the periphery of the display panels. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic cross-sectional view of a display device of the first embodiment.

[0015] Figure 2 is a schematic plan view of a display device of the first embodiment.

[0016] Figure 3 is a schematic plan view of a front panel of the first embodiment.

[0017] Figure 4 is a plan view schematically showing an example of alignment of a display panel with a front panel.

[0018] Figure 5 is a configuration view of a press bonding device of the first embodiment.

[0019] Figure 6 is a configuration view for explaining the operation of the press bonding device.

[0020] Figure 7 is a configuration view for explaining the operation of the press bonding device.

[0021] Figure 8 is a configuration view for explaining the operation of the press bonding device.

[0022] Figure 9 is a view for explaining an example of a method of detecting the position accuracy of a display panel adhered to a front panel.

[0023] Figure 10 is a view for explaining an example of a method of detecting the position accuracy of a display panel adhered to a front panel of a comparative example.

[0024] Figure 11 is a plan view showing a part of a display device of the first embodiment in an enlarged scale.

[0025] Figure 12 is a plan view showing a part of a display device of a modified example of the first embodiment in an enlarged scale.

[0026] Figure 13 is a schematic plan view of a front panel of the second embodiment.

[0027] Figure 14 is a plan view showing a part of a display device of the second embodiment in an enlarged scale.Figure 13 Top view of area A.

[0028] Figure 15 This is a schematic top view of the display device according to the third embodiment. Detailed Implementation

[0029] The embodiments for carrying out this disclosure are described in detail with reference to the accompanying drawings. This disclosure is not limited to the contents described in the following embodiments. Furthermore, the constituent elements described below include substantially the same elements readily conceived by those skilled in the art. Moreover, the constituent elements described below can be appropriately combined. Furthermore, this disclosure is merely an example, and appropriate modifications that are readily conceived by those skilled in the art and have the inventive spirit are naturally included within the scope of this disclosure. Additionally, to make the description clearer, the width, thickness, shape, etc., of various parts of the drawings are sometimes schematically shown compared to the actual form, but this is merely an example and not a limitation on the interpretation of this disclosure. Furthermore, in this specification and the various figures, the same reference numerals are sometimes used for elements that are the same as those described with respect to the existing drawings, and detailed descriptions are appropriately omitted.

[0030] In this specification and claims, when describing the configuration of other structures on top of a certain structure, the use of "on top of" alone, unless otherwise stated, includes two cases: one where other structures are configured directly above a certain structure in connection with it, and the other where other structures are configured above a certain structure with another structure in between.

[0031] Figure 1 This is a schematic cross-sectional view of the display device according to the first embodiment. Figure 2 This is a schematic top view of the display device according to the first embodiment. Figure 3 This is a schematic top view of the front panel of the first embodiment. Figure 1 yes Figure 2 Section I-I' in the middle. Additionally... Figure 3 It is to remove Figure 2 A top view of the front panel 1 in the case of multiple display panels 2.

[0032] like Figure 1 As shown, the display device 3 of the first embodiment includes a front panel 1 and three display panels 2. The three display panels 2 are attached to the front panel 1 with a gap between them. The display panels 2 are smaller than the front panel 1 when viewed from above.

[0033] The front panel 1 is a cover component that protects the display panel 2. The display panel 2 is disposed on one side of the front panel 1 and is mounted to the front panel 1 through an adhesive layer (not shown). The front panel 1 is as follows... Figure 2The front panel 1 is shown as being substantially rectangular in plan view, with the corners being chamfered to form curves. In addition, the front panel 1 is formed to be left-right symmetrical. However, the shape of the front panel 1 is not limited thereto, and for example, the front panel 1 can be left-right asymmetrical.

[0034] As shown in Figure 1 , the front panel 1 is bent as a whole with a curvature R1. The front panel 1 is glass or synthetic resin having light transmissivity. Therefore, light from the display panel 2 is transmitted through the front panel 1. Also, from the viewpoint of the viewer, an image is displayed on the display surface along the surface of the front panel 1. The front panel 1 formed of glass is also referred to as cover glass.

[0035] The display panel 2 is, for example, a liquid crystal panel or an organic light emitting diode panel (hereinafter referred to as an OLED panel). The liquid crystal panel or the OLED panel can also include a touch panel. In the case where the display panel 2 is a liquid crystal panel, a backlight 8 is provided on the back side (the side opposite to the front panel 1) of the display panel 2 (refer to Figure 11 ). The display panel 2 includes a first substrate and a second substrate formed of glass or the like, and a liquid crystal layer interposed between the first substrate and the second substrate. In addition, the display panel 2 is connected to a wiring substrate 9. The wiring substrate 9 is, for example, a flexible printed substrate.

[0036] As shown in Figure 2 , for example, the display panel 2-2 located in the central portion is rectangular in plan view. The display panels 2-1, 2-3 located on the left and right of the display panel 2-2 are in a shape in which a curved portion is provided in a part of the outer shape in plan view.

[0037] In addition, as shown in Figure 1 , the display panel 2 is curved in cross-sectional view, and from the viewpoint of the viewer, both ends in one direction of the display panel 2 are located on the front side compared to the center in one direction. As shown in Figure 1 , the front panel 1 has a curved curved surface portion, and the curvature of the curved surface portion is fixed throughout the surface. The front surface of the display panel 2 is attached to the second surface la of the front panel 1, and is curvedly attached along the front panel 1. However, the front panel 1 can have a plurality of curved surface portions having different curvatures. The front panel 1 is not limited to a concave curved surface portion, and can be a convex curved surface portion, or can be formed in a cross-sectional S shape in which a concave curved surface portion and a convex curved surface portion are combined.

[0038] Next, referring to Figure 2 , 3, the multiple alignment marks provided to the front panel 1 are illustrated. Further, in the following description, sometimes the edge of the outer periphery of the display panel 2, which is connected to the wiring substrate 9 and extends in one direction, is referred to as a "lower edge". Sometimes the edge extending in one direction on the side opposite to the lower edge is referred to as an "upper edge". Sometimes the edge extending in a direction orthogonal to the one direction is referred to as a "left edge" and a "right edge".

[0039] As shown in Figure 3 , the front panel 1 has a display region CA having light transmittance, and a peripheral region BA different from the display region CA. Multiple display regions CA are arranged on one front panel 1, with the peripheral regions BA therebetween, in one direction. The display panel 2 is provided opposite to the display region CA, respectively, and is bently attached along the front panel 1, respectively.

[0040] The peripheral region BA is a region that is shielded from light, and for example, a decorative layer or a metal layer after coloring is formed. The peripheral region BA is printed in black, for example. However, in Figure 2 , 3 , and the like, the illustrated peripheral region BA is not filled with color for ease of explanation.

[0041] The front panel 1 has multiple alignment marks 71, multiple first marks 72, and multiple second marks 73 provided to the peripheral region BA. The multiple alignment marks 71, the multiple first marks 72, and the multiple second marks 73 are printed in white, for example, on a black printed layer. However, each alignment mark is not limited to white, and can be any combination of colors as long as a clear contrast can be observed between the decorative layers.

[0042] The multiple alignment marks 71 are provided to be used for alignment of the display panel 2 and the front panel 1 when the display panel 2 is attached to the front panel 1. The multiple alignment marks 71 are provided at positions corresponding to display panel side alignment marks 75 (refer to Figure 4 ) provided to the display panel 2.

[0043] Three alignment marks 71-1, 71-2, 71-3 are provided around the display region CA on the left side in Figure 3 . Four alignment marks 71-2, 71-3, 71-4, 71-5 are provided around the display region CA in the central portion. Three alignment marks 71-4, 71-5, 71-6 are provided around the display region CA on the right side. Further, in the following description, in cases where it is not necessary to distinguish the alignment marks 71-1, 71-2, 71-3, 71-4, 71-5, 71-6, only the alignment marks 71 are referred to.

[0044] The alignment marks 71-2, 71-3 are provided between the display region CA on the left side and the display region CA in the central portion, and are used for Figure 2The alignment of the display panel 2-1 and the alignment of the display panel 2-2 are shown. In addition, the alignment marks 71-4, 71-5 are provided between the display area CA of the central portion and the display area CA of the right side, and are used for Figure 2 The alignment of the display panel 2-2 and the alignment of the display panel 2-3 are shown.

[0045] The plurality of alignment marks 71 are quadrangular shapes. For example, the alignment marks 71-1, 71-6 are square shapes, and the alignment marks 71-2, 71-3, 71-4, 71-5 are rectangular shapes, and are different shapes from each other. Further, the plurality of alignment marks 71 are not limited to quadrangular shapes, and can be any shape as long as they are shapes that can be subjected to image recognition, such as circular shapes, cross shapes, polygonal shapes, and the like.

[0046] The plurality of first marks 72 are provided in order to confirm the positional accuracy (presence or absence of misalignment) of the display panel 2 after the display panel 2 is attached to the front panel 1. The plurality of first marks 72 are each formed in a linear shape extending along the outer periphery of the display panel 2. The line width (width in a direction orthogonal to the extending direction) of the plurality of first marks 72 is each smaller than the width of the alignment marks 71. In addition, the shape and line width of the plurality of first marks 72 are also different from the display panel side alignment marks 75 (refer to Figure 4 ).

[0047] Specifically, the plurality of first marks 72-1 extend in one direction along the lower edge of the display panel 2. The two first marks 72-1 are each disposed apart from the center line CL in one direction of the display panel 2. In other words, the two first marks 72-1 are provided at positions that do not overlap the wiring substrate 9.

[0048] The plurality of first marks 72-2 are formed in an L shape in correspondence with the corners of the lower edge of the display panel 2. The plurality of first marks 72-2 are formed in an L shape by connecting a portion extending along the lower edge of the display panel 2 and a portion extending along the left edge or the right edge of the display panel 2.

[0049] The plurality of first marks 72-3 extend in one direction along the upper edge of the display panel 2. The plurality of first marks 72-3 are each provided in the peripheral area BA on the opposite side from the plurality of first marks 72-1 across the display area CA. The length in the extending direction of the first marks 72-3 is shorter than the first marks 72-1.

[0050] The plurality of first marks 72-4 extend obliquely with respect to one direction along the curved portion of the display panel 2. The plurality of first marks 72-4 are each provided in a region on one end side in one direction of the peripheral area BA and a region on the other end side.

[0051] The plurality of second marks 73 are provided to confirm the positional accuracy (misalignment) of the backlight 8 after the backlight 8 is attached to the back surface of the display panel 2. The plurality of second marks 73 are provided between the first marks 72 and the outer periphery of the front panel 1, and are formed in a linear shape extending along the outer periphery of the front panel 1. In addition, the plurality of second marks 73 are provided to be positioned between the upper edge of the display panel 2 and the outer periphery of the front panel 1 after the display panel 2 and the front panel 1 are attached.

[0052] Furthermore, the number or position of the plurality of alignment marks 71, the plurality of first marks 72, and the plurality of second marks 73 are merely examples, and can be appropriately changed.

[0053] Next, a method of aligning the display panel 2 and a method of confirming the positional accuracy will be described. Figure 4 is a plan view schematically showing an example of aligning the display panel and the front panel. Figure 5 is a configuration view of the crimping device of the first embodiment. Figures 6-8 is a configuration view for explaining the operation of the crimping device. As shown in Figure 5 , the crimping device 100 includes a vacuum chamber 5, a vacuum source 51, a stage 10, an elastic body 20, a fixed stage 62, setting stages 61, 63, a lifting device 65, a pipe 52, and a control device 30. In addition, the crimping device 100 is provided with a camera 7.

[0054] The vacuum chamber 5 is a container that houses the stage 10, the fixed stage 62, the setting stages 61, 63, and the lifting device 65. The vacuum source 51 is a pump that discharges air in the vacuum chamber 5 via the pipe 52 to make the pressure in the vacuum chamber 5 lower than the atmosphere.

[0055] The stage 10 is disposed in the vacuum chamber 5, and is a jig for fixing the front panel 1 in a state of being in close contact with the fixed portion 11 along the surface of the curved portion. The setting stage 61 is provided with the stage 10. The interval between the fixed stage 62 and the setting stage 61 can be appropriately changed using the lifting device 65. The lifting device 65 lifts the setting stage 61 with respect to the fixed stage 62 by driving a driving mechanism such as a hydraulic pressure or a motor based on a control command of the control device 30. In addition, the setting stage 63 is connected to the XY stage, and is provided to be movable in the XY plane by driving a motor driving mechanism based on a control command of the control device 30.

[0056] The elastic body 20 is a base having elasticity. The elastic body 20 is formed of a thin sheet-shaped synthetic rubber, an elastic body, or the like having a uniform film thickness when no pressure is applied. The elastic member can also be natural rubber. The elastic body 20 is fixed to the surface of the setting stage 63 on the side of the setting stage 61. As shown in Figure 3 , the elastic body 20 has a pressure receiving surface 20F having a concave shape along the fixing surface 11F of the fixed portion 11.

[0057] The support sheet 4 is an elastic component. This elastic component is formed from a thin sheet of synthetic rubber, elastomer, etc., with uniform film thickness when no pressure is applied. The elastic component can also be made of natural rubber.

[0058] The display panel 2 is pre-attached to the carrier plate 4 using an adhesive layer or similar material. The carrier plate 4 is positioned at a predetermined position where the display panel 2 coincides with the front panel 1 when viewed from above. The carrier plate 4 is clamped between the elastomer 20 and the stage 10 in a non-contact manner. The section line L1 of the mounting surface of the carrier plate 4 for mounting the display panel 2 is along the tangent line L2 of the front panel 1, which is positioned at the minimum distance from it.

[0059] The control device 30 is, for example, a computer that includes at least a CPU (Central Processing Unit) as an arithmetic unit and a memory as a storage unit. The control device 30 can also use these hardware resources to execute computer programs to perform various functions.

[0060] Specifically, the control device 30 reads the computer program stored in a designated storage unit (not shown) and expands it in the memory, causing the CPU to execute the commands contained in the expanded program. The control device 30 controls the operation of the vacuum source 51 to control the pressure within the vacuum chamber 5. Additionally, the control device 30 controls the operation of the lifting device 65 to control the distance between the mounting platform 61 and the mounting platform 63. Thus, based on the driving of the lifting device 65, the distance between the elastic body 20 and the platform 10 changes.

[0061] Furthermore, the control device 30 calculates the position coordinates of the front panel 1 and the display panel 2 in the XY plane based on image data from the camera 7. Based on the calculation results, it controls the movement of the XY stage and the position of the setting platform 63. This aligns the display panel 2 with the front panel 1.

[0062] like Figure 4 As shown, the control device 30 calculates the position of the center position CP of the alignment mark 71 located on the front panel 1 based on image data from the camera 7. Additionally, the control device 30 calculates the position of the intersection point of the alignment marks 75 on the display panel side based on image data from the camera 7. Based on these calculation results, the control device 30 moves the mounting stage 6 such that the alignment marks 75 and 71 on the display panel side coincide. This aligns the display panel 2 with the front panel 1.

[0063] In addition, Figure 4In the present embodiment, a set of display panel side alignment marks 75 and alignment marks 71 are shown, but the control device 30 detects a plurality of display panel side alignment marks 75 and a plurality of alignment marks 71 provided around the display panel 2 to calculate the positions of the display panel 2 and the front panel 1. In addition, Figure 4 The recognition method of the alignment marks 71 by the camera 7 is not limited to this example. For example, the positions of the alignment marks 71 can be calculated by recognizing at least two edges (edges S1, S2) of the alignment marks 71. The display panel side alignment marks 75 are in a cross shape, but are not limited to this. The display panel side alignment marks 75 can be in other shapes as long as they are shapes that can be recognized by image recognition.

[0064] Next, a manufacturing method of a display device using the press-bonding device 100 described above will be described. First, in a preparation process, as shown in FIG. 1, a first display panel 2 (display panel 2-1) is attached to the carrier sheet 4 in the vacuum chamber 5 with an adhesive layer. At this time, an adhesive layer is also attached in advance to the side of the display panel 2 opposite the front panel 1. In addition, the adhesive force of the adhesive layer on the side of the carrier sheet 4 is smaller than that of the adhesive layer on the side opposite the front panel 1. Figure 5

[0065] Furthermore, in the preparation process, the front panel 1 is fixed in a state of being in close contact with the fixing portion 11, and the front panel 1 is attached to the stage 10 with an adhesive layer. In this way, the front panel 1 is placed on the stage 10. The attachment of the front panel 1 to the stage 10 can be performed before or after the attachment of the first display panel 2 to the carrier sheet 4, or simultaneously.

[0066] After the preparation process, as described above, the image data of the alignment marks 71 and the display panel side alignment marks 75 are acquired by the camera 7, and the alignment of the display panel 2 and the front panel 1 is performed. Thereafter, a decompression process of reducing the pressure in the vacuum chamber 5 is performed after the preparation process. The control device 30 controls the operation of the vacuum source 51 to control the pressure in the vacuum chamber 5.

[0067] The press-bonding process of attaching the display panel 2 to the front panel 1 is performed after the pressure in the vacuum chamber 5 reaches a predetermined pressure. As shown in FIG. 2, the control device 30 sets the lifting device 65 to the raised state, and reduces the distance between the setting table 61 and the setting table 63. Figure 6

[0068] As a result, the distance between the carrier sheet 4 and the fixing portion 11 of the stage 10 becomes shorter, and the first display panel 2 attached to the carrier sheet 4 comes into abutment with the front panel 1. In the press-bonding process, if the front panel 1 comes into abutment with the first display panel 2, the first display panel 2 and the carrier sheet 4 are sandwiched together between the elastic body 20 and the front panel 1.

[0069] After the press-bonding process, in a peeling process, as shown in FIG. 3, the carrier sheet 4 is peeled from the first display panel 2. The carrier sheet 4 is peeled from the first display panel 2 by the peeling device 70. Figure 7 ​​As shown, the control device 30 sets the lifting device 65 to a lowered state, increasing the distance between the setting platform 61 and the setting platform 63. This allows the support piece 4 to be detached from the first display panel 2 while maintaining the first display panel 2 in contact with the front panel 1.

[0070] Next, as Figure 7 As shown, a second display panel 2 (display panel 2-3) is mounted on the carrier plate 4 using an adhesive layer. The carrier plate 4 is positioned at a predetermined position different from the position where the first display panel 2 is mounted, and the second display panel 2 coincides with the front panel 1 when viewed from above. Next, after aligning the second display panel 2 with the front panel 1, although not shown in the figure, as described above, during the pressing process, the control device 30 sets the lifting device to the raised state, reducing the distance between the setting platform 61 and the setting platform 63.

[0071] After the crimping process, in the peeling process, such as Figure 8 As shown, the control device 30 sets the lifting device to a lowering state, increasing the distance between the setting platform 61 and the setting platform 63. This allows the support piece 4 to be detached from the second display panel 2 while maintaining the second display panel 2 in contact with the front panel 1.

[0072] Next, as Figure 8 As shown, a third display panel 2 (display panel 2-2) is mounted on the carrier plate 4 using an adhesive layer. The carrier plate 4 is positioned differently from the positions where the first and second display panels 2 are mounted, and in a top view, the third display panel 2 coincides with the front panel 1. Next, after aligning the third display panel 2 with the front panel 1, although not shown in the figure, a pressing process is performed as described above. Then, a peeling process is performed.

[0073] Next, the pressure inside vacuum chamber 5 is restored to atmospheric pressure, and... Figure 1 and Figure 2 The display device 3 shown is removed.

[0074] Figure 9 This is an explanatory diagram illustrating an example of a method for detecting the positional accuracy of a display panel bonded to the front panel. Figure 10 This is an explanatory diagram illustrating an example of a method for detecting the positional accuracy of a display panel bonded to the front panel of a comparative example. Furthermore, in Figure 9 as well as Figure 10 For ease of explanation, an example of a display panel 2 being attached to a front panel 1 is shown.

[0075] like Figure 9As shown, after the display panel 2 is attached to the front panel 1, the positional accuracy of the display panel 2 is confirmed using the camera 7. In this case, with the camera 7 positioned along the normal direction of the display panel 2, the positional accuracy is checked. Figure 4 The positional relationship between alignment mark 71 and alignment mark 75 on the display panel side is shown. Specifically, based on image data from camera 7, control device 30 calculates the distance W1 between alignment mark 75 on the display panel side and edge S1, and the distance W2 between alignment mark 75 on the display panel side and edge S2. If distances W1 and W2 fall within a specified range, it is determined that the display panel 2 is not misaligned.

[0076] On the other hand, Figure 10 In the comparative example shown, when the display panel 2 is tilted, the normal direction of the display panel 2 is offset from the position of the camera 7. In this case, a detection is made corresponding to the tilt angle of the display panel 2. Figure 4 The alignment mark 71 shown has a different positional relationship with the alignment mark 75 on the display panel side. For example, if the display panel 2 is tilted, then... Figure 9 Compared to detecting a smaller distance W1, the positional accuracy of the display panel 2 cannot be accurately determined. Furthermore, the detected distance W1 may vary depending on the magnification or focal distance of the camera 7. Alternatively, the edge of the alignment mark 71 may not be properly detected after the display panel 2 is attached to the front panel 1.

[0077] Figure 11 This is a top view showing an enlarged portion of the display device according to the first embodiment. Furthermore, in Figure 11 In the image, backlight 8 is indicated by a two-dot dashed line. (Example:) Figure 2 , Figure 3 as well as Figure 11 As shown, in this embodiment, a plurality of first marks 72 are provided on the front panel 1. Therefore, after the display panel 2 is attached to the front panel 1, the outer periphery of the display panel 2 and the positions of the plurality of first marks 72 can be detected, making it easy to confirm the positional accuracy of the display panel 2. The confirmation of the positional accuracy of the display panel 2 can be based on image data captured by the camera 7, or it can be performed visually.

[0078] More specifically, the first marks 72-1 and 72-3 are arranged along the lower and upper edges of the display panel 2, respectively. Therefore, based on the spacing or overlap of the first marks 72-1 and 72-3 with the lower and upper edges of the display panel 2, the positional accuracy of the display panel 2 in a direction orthogonal to the direction in which the first marks 72-1 and 72-3 extend can be easily determined. Furthermore, multiple first marks 72-1 and 72-3 are arranged in one direction, thus the tilt of the display panel 2 relative to one direction can be easily determined. Additionally, as... Figure 2 ,3 As illustrated, since the L-shaped first marks 72-2 and the first marks 72-4 along the curved portion are provided, even if the display panel 2-1, 2-3 having the curved portion is used, the positional accuracy in one direction of the display panel 2 can be easily confirmed.

[0079] Further, in the present embodiment, the plurality of second marks 73 are provided in the front panel 1. Thereby, after the backlight 8 is attached to the back surface of the front panel 1 and the display panel 2, the positions of the outer periphery of the backlight 8 and the plurality of second marks 73 can be detected, and the positional accuracy of the backlight 8 can be easily confirmed.

[0080] Further, sometimes the backlight 8 does not require high positional accuracy compared to the display panel 2, and thus the allowable range of misalignment is relatively large. Therefore, the second marks 73 can be provided along at least one side of the backlight 8, or the second marks 73 can not be provided.

[0081] In the first embodiment, the display device 3 is mounted on the dashboard of a vehicle, for example. The display device 3 has an advantage that the curved interior trim of the vehicle is smoothly connected to the surface of the display device 3 by bending the surface of the front panel 1. The display panel 2 displays, for example, a navigation device, a speedometer, a tachometer, a fuel gauge, a water temperature gauge, and the like.

[0082] Further, the display device 3 is not necessarily mounted on a vehicle, and can be applied to other electronic devices such as a mobile terminal. In addition, even in the case where the display device 3 is mounted on a vehicle, the image displayed by the display device 3 is not limited to the instrument of the vehicle, and can be, for example, a map of a car navigation device, or the like.

[0083] Further, the display panel 2 can be an organic EL panel. In the case where the display panel 2 is an organic EL panel, a backlight is not required. In addition, the display panel 2 can have a touch detection function. That is, a touch panel can be provided in the inside of the display panel 2 or on the surface of the display panel 2.

[0084] Further, the front panel 1 is not necessarily formed of glass. The front panel 1 can be formed of, for example, a light-transmissive synthetic resin.

[0085] As described above, the display device 3 of the present embodiment includes a front panel 1 having a display region CA that is light-transmissive and a peripheral region BA that is different from the display region CA, and a display panel 2 that is provided opposite to at least the display region CA of the front panel 1. The front panel 1 has a plurality of alignment marks 71 provided in the peripheral region BA at positions corresponding to display panel side alignment marks 75 provided in the display panel 2, and a plurality of linear first marks 72 extending along the outer periphery of the display panel 2.

[0086] Thus, the control device 30 can perform image recognition of the alignment mark 75 on the display panel side and the alignment mark 71 based on the image data from the camera 7, and perform alignment of the front panel 1 and the display panel 2. Then, by observing the positional relationship between the plurality of linear first marks 72 and the outer periphery of the display panel 2 after the front panel 1 and the display panel 2 are bonded, the positional accuracy of the display panel 2 can be easily confirmed. In addition, by providing the first marks 72 different from the alignment mark 71, it is possible to suppress detection deviation of the positional accuracy due to the difference in the inclination of the display panel 2 with respect to the observation direction of the camera 7, compared to the case where the positional accuracy of the display panel 2 is confirmed using the alignment mark 71 and the alignment mark 75 on the display panel side after the front panel 1 and the display panel 2 are bonded.

[0087] (Modified Example)

[0088] Figure 12 is a plan view that enlargedly shows a part of the display device of the modified example of the first embodiment. In addition, in the following description, the same reference numerals are given to the same constituent elements as those described in the above embodiment, and the repeated description is omitted.

[0089] As shown in Figure 12 , the front panel 1A of the modified example has a plurality of sub-marks 72a, 72b in addition to the first marks 72. More specifically, the plurality of sub-marks 72a, 72b are arranged side by side with the first marks 72-1, 72-3 in the direction perpendicular to the outer periphery of the display panel 2. The length in the extension direction of the plurality of sub-marks 72a, 72b is formed shorter than that of the first marks 72, and thus is set to be able to be distinguished from the first marks 72.

[0090] In the present modified example, the first marks 72 are arranged between the plurality of sub-marks 72a, 72b in the direction perpendicular to the outer periphery of the display panel 2. More specifically, the sub-mark 72a is arranged between the first marks 72-1, 72-3 and the outer periphery of the front panel 1A. The sub-mark 72b is arranged between the first marks 72-1, 72-3 and the outer periphery of the display region CA of the front panel 1A.

[0091] In the present modified example, by confirming the positional relationship between the outer periphery of the display panel 2 and the first marks 72 and the sub-marks 72a, 72b after the display panel 2 and the front panel 1A are bonded, the size of the misalignment of the display panel 2 can be easily confirmed.

[0092] In addition, in Figure 12 , two sub-marks 72a, 72b are provided with respect to one first mark 72. However, it is not limited thereto, and three or more sub-marks 72a, 72b can be provided with respect to one first mark 72. In addition, in Figure 12In the first embodiment, the first marks 72-1, 72-3 extending in a line are provided with sub-marks 72a, 72b. However, the present application is not limited thereto, and the sub-marks 72a, 72b can be provided to the first mark 72-2 in the L shape or the first mark 72-4 extending obliquely with respect to one direction (see FIG. 6). Figure 3 ) setting sub-marks 72a, 72b.

[0093] (Second Embodiment)

[0094] Figure 13 is a schematic plan view of a front panel of the second embodiment. Figure 14 is a plan view of the area A shown in Figure 13 enlarged. In the first embodiment and the modified example described above, an example in which the front panel 1 is formed with a curved curved portion and a plurality of display panels 2 are attached to one front panel 1 is shown, but the present application is not limited thereto.

[0095] As shown in Figure 13 , the front panel 1B of the second embodiment is a flat plate, and one display panel 2 is attached to the front panel 1B opposite one display region CA (the illustration is omitted in Figure 13 ). The display region CA is substantially quadrangular, and in the example shown in Figure 13 , it is a trapezoidal shape. The peripheral region BA is formed in a frame shape surrounding the periphery of the display region CA. However, the present application is not limited thereto, and the display region CA can be rectangular, polygonal, circular, or other shapes.

[0096] As shown in Figure 13 and Figure 14 , in the present embodiment, an alignment mark 71B and a first mark 72B are provided to the front panel 1B. The alignment mark 71B is in a cross shape, and is disposed at the corners of the peripheral region BA, respectively. The first mark 72B is disposed near the alignment mark 71B, and is disposed at the corners of the peripheral region BA, respectively.

[0097] On the upper side of the peripheral region BA, the first marks 72B in a line provided to the upper side of the peripheral region BA and extending in one direction are disposed separately from the first marks 72B in a line provided to the left and right sides of the peripheral region BA and extending in a direction intersecting the one direction. The alignment marks 71B-1, 71B-2 are disposed separately from the first marks 72B, and are located at the intersection of the extensions of the first marks 72B.

[0098] On the lower side of the peripheral region BA, the first marks 72B in a line are provided in a curved line shape bending along the corners of the display region CA. The alignment marks 71B-3, 71B-4 are provided outside the first marks 72B between the first marks 72B and the outer periphery of the front panel 1B.

[0099] In the present embodiment, after the display panel 2 is attached to the front panel 1B, the alignment marks 71B and the first marks 72B are provided in correspondence with the corners of the display panel 2. Then, the position accuracy of the display panel 2 can be confirmed using the first marks 72B provided at the four corners of the display panel 2. However, the first marks 72B can be provided along the four sides of the display panel 2.

[0100] (Third Embodiment)

[0101] Figure 15 Fig. 16 is a schematic plan view of a display device of the third embodiment. In addition, in Figs. 16 and 17, the display panel 2C is shown by a two-dot chain line for easy observation of the drawings. Although not shown, the front panel 1C and the display panel 2C of the present embodiment are, like the first embodiment, curved surface panels having curved surface portions that are curved in a cross-sectional view. Figure 15 As shown in Fig. 16, the upper side of the display panel 2C is formed in a curve that is convexly curved on the outer side. The front panel 1C is curved in correspondence with the display panel 2C, and the upper side is formed in a curve that is curved, and the left and right sides are inclined. In addition, the sides of the front panel 1C are connected by smooth curves. Figure 15

[0102] In the present embodiment, the plurality of alignment marks 71C are each a quadrangular shape, and are provided in correspondence with the corners of the display panel 2C. The plurality of first marks 72C are each a linear shape, and are provided along the four sides of the display panel 2C.

[0103] The first mark 72C-1 is provided between the alignment marks 71C-1 and 71C-2 adjacent in one direction, and extends along the lower side of the display panel 2C. The first mark 72C-2 is provided on the side opposite the first mark 72C-1 across the display region CA. The first mark 72C-2 is provided between the alignment marks 71C-3 and 71C-4 adjacent in one direction, and extends along a portion of the upper side of the display panel 2C.

[0104] The first mark 72C-3 is provided between the alignment marks 71C-1 and 71C-4 adjacent in a direction orthogonal to one direction, and extends along the left side of the display panel 2C. The first mark 72C-4 is provided on the side opposite the first mark 72C-3 across the display region CA. The first mark 72C-4 is provided between the alignment marks 71C-2 and 71C-3 adjacent in a direction orthogonal to one direction, and extends along the right side of the display panel 2C. In the present embodiment, the first marks 72C-1, 72C-3, and 72C-4 are formed longer along the sides of the outer periphery of the display panel 2C that extend in a straight line. Thus, after the display panel 2C is attached to the front panel 1C, the position accuracy or inclination of the display panel 2C can be easily confirmed.

[0105] ​In addition, the second mark 73C is located on the four sides of the surrounding area BA, between the first mark 72C and the outer periphery of the front panel 1C.

[0106] Furthermore, the configurations of the above-described embodiments and modifications can be appropriately combined. For example, the front panels 1 and 1C can be adopted... Figure 13 , Figure 14 The alignment mark 71B and the first mark 72B shown can also be used on the front panel 1, 1B. Figure 15 Alignment marks 71C, 72C, and 73C are shown. Alternatively, alignment marks 71C, 72C, and 73C may also be used on the front panels 1B and 1C. Figure 12 The sub-markers 72a and 72b are shown.

[0107] The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. The content disclosed in the embodiments is merely an example, and various modifications can be made without departing from the spirit of the present invention. Appropriate modifications made without departing from the spirit of the present invention are of course also within the technical scope of the present invention. At least one of various omissions, substitutions, and modifications of the constituent elements can be made without departing from the spirit of the above embodiments and variations.

[0108] Explanation of reference numerals in the attached figures

[0109] 1. Front panels of 1A, 1B, and 1C

[0110] 2.2C display panel

[0111] 3 Display devices

[0112] 5 vacuum chambers

[0113] 7 cameras

[0114] 8 backlights

[0115] 10 years of Taiwan

[0116] 30 control devices

[0117] 61, 63 Setting Platform

[0118] 62 fixed platforms

[0119] 65 lifting device

[0120] Alignment marks 71, 71B, 71C

[0121] Mark 1 of 72, 72B, and 72C

[0122] 72a, 72b sub-markers

[0123] 73, 73C, second mark

[0124] 75 display panel side alignment mark

[0125] 100 crimping device

[0126] BA peripheral area

[0127] CA display area

[0128] CP center position.

Claims

1. A display device comprising: The front panel has a light-transmitting display area and a peripheral area different from the display area; and A display panel disposed opposite at least the display area of ​​the front panel. The front panel has: Multiple alignment marks are provided in the peripheral region at positions corresponding to multiple display panel side alignment marks provided on the display panel; A plurality of linear first marks extending along the outer periphery of the display panel; and Multiple sub-marks arranged side-by-side with the first mark in a direction perpendicular to the outer periphery of the display panel. The first marker is configured among the plurality of sub-markers.

2. The display device according to claim 1, wherein, The plurality of the first marks include linear marks disposed along the edges of the display panel and L-shaped marks disposed corresponding to the corners of the display panel.

3. The display device according to claim 1 or 2, wherein, The length of the sub-mark is shorter than that of the first mark.

4. The display device according to any one of claims 1 to 3, wherein, The plurality of alignment marks and the plurality of first marks are provided corresponding to the corners of the display panel.

5. The display device according to any one of claims 1 to 3, wherein, The plurality of alignment marks are provided corresponding to the corners of the display panel, and the plurality of first marks are provided along each of the four sides of the display panel.

6. The display device according to any one of claims 1 to 5, wherein, It also has a second mark. The second mark is located between the first mark and the outer periphery of the front panel.

7. The display device according to any one of claims 1 to 6, wherein, The front panel has a curved surface portion. The display areas are arranged in multiples on one of the front panels. The display panel is disposed corresponding to the plurality of display areas, and is respectively bent and attached to the front panel along the front panel.

8. The display device according to any one of claims 1 to 7, wherein, The sub-mark among the plurality of sub-marks, which is positioned between the first mark and the display area, overlaps with the display panel.

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