Display device

Abstract

A display device comprises a flexible display panel, a substrate, a cover plate, a first connecting piece and a first adhesive layer. The substrate is located on the bottom side of the flexible display panel and has a normal direction, a first direction and a second direction, the first direction and the second direction are perpendicular to the normal direction, and the first direction is perpendicular to the second direction. The cover plate is located on the top side of the flexible display panel. The first adhesive layer is located between the cover plate and the flexible display panel. The extension direction of the two first side edges of the flexible display panel is parallel to the second direction. The bending axial direction of the flexible display panel is parallel to the first direction, and the display surface of the flexible display panel is suitable for protruding outwards in the direction away from the substrate. The first adhesive layer comprises two opposite third side edges, and the two third side edges are parallel and aligned with the two first side edges. In the first direction, the length of the cover plate is larger than that of the first adhesive layer.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a display device including a flexible display panel. Background Art

[0002] Generally speaking, when a flexible display is dynamically folding, rolling, or sliding, the adhesive is prone to peeling. Even if the flexible display has a static fixed curve, if the radius of curvature of the corner is too small, the adhesive is prone to peeling. The peeling of the adhesive may be caused by separation from the upper and lower materials, or separation within the adhesive itself. Summary of the Invention

[0003] The present invention provides a display device which can prevent adhesive material from peeling off and thus improve the yield rate.

[0004] The display device of the present invention includes a flexible display panel, a substrate, a cover plate, a first connecting member, and a first adhesive layer. The flexible display panel has a top side and a bottom side opposite to each other. The substrate is located on the bottom side and has a normal direction and a first direction and a second direction perpendicular to the normal direction, wherein the first direction is perpendicular to the second direction. The cover plate is located on the top side. The first connecting member is located between the substrate and the flexible display panel. The first adhesive layer is located between the cover plate and the flexible display panel. The flexible display panel includes two opposite first side edges and two opposite second side edges, wherein the extension direction of the two first side edges is parallel to the second direction, and the extension direction of the two second side edges is parallel to the first direction. The bending axis of the flexible display panel is parallel to the first direction, and the display surface of the flexible display panel is adapted to bulge outward in a direction away from the substrate. The first adhesive layer includes two opposite third side edges, wherein the two third sides are parallel to and aligned with the two first side edges. In the first direction, the length of the cover plate is greater than the length of the first adhesive layer.

[0005] In one embodiment of the present invention, in the first direction, the length of the cover is greater than the length of the substrate.

[0006] In one embodiment of the present invention, the length of the first connecting member is less than or equal to the length of the flexible display panel.

[0007] In one embodiment of the present invention, the length of the first connecting member is less than or equal to the length of the substrate.

[0008] In one embodiment of the present invention, the length of the first connecting member is less than or equal to the length of the first adhesive layer.

[0009] In one embodiment of the present invention, the storage modulus of the first adhesive layer is between 20% and 60% of the storage modulus of the first connecting member.

[0010] In one embodiment of the present invention, the above-mentioned display device also includes a bonding layer located on the cover plate. In the first direction and the second direction, the length of the bonding layer is greater than the length of the first adhesive layer, the length of the bonding layer is greater than the length of the first connecting member, and the length of the bonding layer is greater than the length of the cover plate.

[0011] In an embodiment of the present invention, the display device further includes a protective member, and the bonding layer is located between the protective member and the cover plate.

[0012] In one embodiment of the present invention, the display device further includes a second connecting member and a back film, wherein the second connecting member is located between the bottom side and the first connecting member, and the back film is located between the second connecting member and the first connecting member.

[0013] In one embodiment of the present invention, the display device further includes a touch panel and a second adhesive layer. The touch panel is positioned on the first adhesive layer. The touch panel includes two opposing fourth sides that are parallel to and aligned with the first side. The second adhesive layer is positioned between the touch panel and the cover plate. In the first direction, the length of the second adhesive layer is equal to the length of the first adhesive layer.

[0014] In one embodiment of the present invention, in the second direction, the length of the flexible display panel is greater than the lengths of the second adhesive layer, the first adhesive layer, and the touch panel.

[0015] In one embodiment of the present invention, in the second direction, the length of the touch panel is greater than the length of the second adhesive layer.

[0016] In one embodiment of the present invention, in the first direction and the second direction, the length of the second adhesive layer is greater than or equal to the length of the first connecting member.

[0017] In one embodiment of the present invention, the storage modulus of the first adhesive layer is smaller than that of the second adhesive layer, and the storage modulus of the second adhesive layer is smaller than that of the second connecting member.

[0018] In one embodiment of the present invention, the storage modulus of the first adhesive layer is smaller than that of the second adhesive layer, and the storage modulus of the second adhesive layer is smaller than that of the first connecting member.

[0019] In one embodiment of the present invention, the display device further includes a light shielding member disposed on the cover plate, and the thickness of the bonding layer in the normal direction is greater than the thickness of the second adhesive layer in the normal direction.

[0020] In one embodiment of the present invention, the display device further includes a light shielding member disposed under the cover plate, and the thickness of the second adhesive layer in the normal direction is greater than the thickness of the bonding layer in the normal direction.

[0021] In one embodiment of the present invention, the storage modulus of the first adhesive layer is between 20% and 60% of the storage modulus of the second connecting member.

[0022] Based on the above, in the display device of the present invention, the flexible display panel is adapted to bulge upward. The first adhesive layer above the flexible display panel includes two opposing third sides that are parallel and aligned with the two first sides of the flexible display panel. Consequently, during folding, the first adhesive layer completely secures the flexible display panel to the upper material. Consequently, the flexible display panel is less likely to pull on the first adhesive layer, causing it to peel, thereby improving yield.

[0023] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A and Figure 1B FIG1 is a three-dimensional schematic diagram of a display device according to an embodiment of the present invention applied to a seat.

[0025] Figure 2A and Figure 2B Schematic diagram of bending methods of display devices in some embodiments of the present invention.

[0026] Figure 3 FIG. 1 is a front view schematic diagram of a display device according to an embodiment of the present invention.

[0027] Figure 4 FIG. 1 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0028] Figure 5A and Figure 5B FIG. 1 is a schematic diagram of the operation of a display device according to an embodiment of the present invention.

[0029] Figure 6A and Figure 6B 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention taken along different cross-sectional lines.

[0030] Figure 7A FIG. 1 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0031] Figure 7B FIG. 1 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0032] The accompanying drawings are described as follows:

[0033] 10: Seat

[0034] 11: Display device

[0035] 11a: Flexible display panel

[0036] 11b: Edge

[0037] 12: Roller

[0038] 20, 20B: first connecting piece

[0039] 30, 30B: first adhesive layer

[0040] 31: Length

[0041] 40: Bonding layer

[0042] 50, 50B: second connecting piece

[0043] 60: Second adhesive layer

[0044] 100, 100B, 100C, 100D: display device

[0045] 110, 110B: Flexible display panel

[0046] 111, 111B: Top side

[0047] 112, 112B: bottom side

[0048] 113: Display surface

[0049] 120, 120B: substrate

[0050] 130, 130B: Cover

[0051] 140, 140B: back film

[0052] 160: Protective parts

[0053] 170: Circuit board

[0054] 180: Shading piece

[0055] 190: Flexible circuit substrate

[0056] 191, 191B: driver chip

[0057] 192: Flexible printed circuit board

[0058] A1: Box

[0059] A11: Open

[0060] B1: Base

[0061] A-A', B-B': section line

[0062] D1: First direction

[0063] D2: Second direction

[0064] H1, H2, H3, H4: thickness

[0065] L1, L2, L4, L5, L7, L1', L2', L4', L5', L7': Length

[0066] N1: normal direction

[0067] R1: Roller

[0068] S1: First side

[0069] S2: Second side

[0070] S3: The third side

[0071] S4: Fourth side

[0072] S5: The fifth side

[0073] TP:Touch Panel

[0074] TP1: Length

[0075] TP2: Top side

[0076] X, Y, Z: directions. DETAILED DESCRIPTION

[0077] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As those skilled in the art will realize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention.

[0078] In the accompanying drawings, for the sake of clarity, the thickness of layers, films, panels, regions, etc. is magnified. Throughout the specification, the same reference numerals represent the same elements. It should be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element, or an intermediate element can also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" can refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" can be the presence of other elements between two elements.

[0079] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is turned over, the element described as being on the "lower" side of the other elements will be oriented on the "upper" side of the other elements. Thus, the exemplary term "lower" can include both "lower" and "upper" orientations, depending on the particular orientation of the figure. Similarly, if the device in one figure is turned over, the element described as being "below" or "beneath" the other elements will be oriented as being "above" the other elements. Thus, the exemplary terms "above" or "below" can include both "above" and "below" orientations.

[0080] As used herein, "about," "approximately," or "substantially" includes the stated value and an average value that is within an acceptable deviation range of the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, or ±5%. Furthermore, as used herein, "about," "approximately," or "substantially" can be selected based on the optical property, etching property, or other property, and may not apply to all properties with a single standard deviation.

[0081] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Therefore, variations in the shapes of the illustrations as a result of, for example, manufacturing techniques and / or tolerances are to be expected. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions as shown herein, but rather include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may typically have rough and / or nonlinear features. Furthermore, sharp angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shape of the regions and are not intended to limit the scope of the claims.

[0082] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present invention, and will not be interpreted as idealized or overly formal unless explicitly defined as such herein.

[0083] Figure 1A and Figure 1BThis is a three-dimensional schematic diagram of a display device according to an embodiment of the present invention applied to a seat. With the development of the automotive industry and technology, users' demand for in-car audio and video entertainment has also been continuously strengthened. Figure 1A and Figure 1B For example, a display device 11 is arranged behind the front seat 10 to provide entertainment experience for rear passengers. Figure 1A and Figure 1B The display device 11 is shown in the stowed and unfolded states applied to the seat 10 , but the present invention is not limited thereto.

[0084] Figure 2A and Figure 2B Schematic diagram of the bending method of the display device of some embodiments of the present invention. Figure 2A and Figure 2B For example, Figure 1A and Figure 1B The display device 11 can utilize the roller 12 to move the flexible display panel 11a of the display device 11 as shown in FIG. Figure 2A Folding as shown, or Figure 2B The sliding shown in FIG. 1 is a schematic diagram of a sliding movement, but the present invention is not limited thereto. In one embodiment, Figure 2A An edge 11 b of the flexible display panel 11 a is connected to the roller 12 . The roller 12 is suitable for unfolding or rolling up the flexible display panel 11 a , but the present invention is not limited thereto.

[0085] Figure 3 FIG. 1 is a front view schematic diagram of a display device according to an embodiment of the present invention. Figure 4 FIG. 1 is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Figure 5A and Figure 5B is a schematic diagram of the operation of a display device according to an embodiment of the present invention. Figure 4 The display device 100 is shown in FIG. Figure 3 The cross-sectional view of the section line AA' is shown. The rectangular coordinates XYZ are also provided here to facilitate the subsequent description and reference of the components.

[0086] Please refer to Figure 3 and Figure 4 The display device 100 of this embodiment includes a substrate 120, a first connector 20, a backing film 140, a second connector 50, a flexible display panel 110, a first adhesive layer 30, and a cover plate 130. The substrate 120, the first connector 20, the backing film 140, the second connector 50, the flexible display panel 110, the first adhesive layer 30, and the cover plate 130 are stacked in sequence in the Z direction. The display device 100 is adapted to convex in the positive Z direction, but the present invention is not limited thereto.

[0087] In this embodiment, the flexible display panel 110 has a top side 111 and a bottom side 112 opposite to each other. The substrate 120 is located on the bottom side 112 of the flexible display panel 110. Specifically, the substrate 120 has a normal direction N1, a first direction D1 perpendicular to the normal direction N1, and a second direction D2 perpendicular to the normal direction N1. Figure 3 The first direction D1 is perpendicular to the second direction D2. Here, the first direction D1 is, for example, parallel to the X direction, the second direction D2 is, for example, parallel to the Y direction, and the normal direction N1 is, for example, parallel to the Z direction.

[0088] In this embodiment, the first connecting member 20 is located between the substrate 120 and the flexible display panel 110 , and the first adhesive layer 30 is located between the cover plate 130 and the flexible display panel 110 .

[0089] In this embodiment, the flexible display panel 110 is adapted to bulge outward in the positive Z-direction. The adhesive on the top side 111 of the flexible display panel 110 is subject to greater shear strain. Therefore, placing the adhesive with a lower storage modulus in a location subject to greater shear strain can reduce the likelihood of peeling during bending. Therefore, the storage modulus of the first adhesive layer 30 above the flexible display panel 110 is required to be lower than the storage modulus of the first connector 20 and the second connector 50 below the flexible display panel 110. For example, the storage modulus of the first adhesive layer 30 is between 20% and 60% of the storage modulus of the first connector 20, and the storage modulus of the first adhesive layer 30 is between 20% and 60% of the storage modulus of the second connector 50. This reduces the likelihood of peeling in the first adhesive layer 30 and avoids significant differences in material properties, but the present invention is not limited to this.

[0090] In this embodiment, the first adhesive layer 30 on the flexible display panel 110 may be a thin film optically transparent adhesive (OCA) or a liquid optically transparent resin. In other embodiments, the first adhesive layer 30 may also be non-transparent, which is not limited to the present invention.

[0091] In this embodiment, the first connecting member 20 and the second connecting member 50 below the flexible display panel 110 may be pressure sensitive adhesive (PSA), double-sided tape, or an adhesive with a substrate in between, which are easy to attach and inexpensive. In other embodiments, the first connecting member 20 and the second connecting member 50 may also be OCA, but the present invention is not limited thereto.

[0092] In this embodiment, the cover plate 130 is located on the top side 111 of the flexible display panel 110, the second connector 50 is located between the bottom side 112 of the flexible display panel 110 and the first connector 20, and the backing film 140 is located between the second connector 50 and the first connector 20. The flexible display panel 110 is bonded to the cover plate 130 using the first adhesive layer 30, the backing film 140 is bonded to the flexible display panel 110 using the second connector 50, and the substrate 120 is bonded to the backing film 140 using the first connector 20, but the present invention is not limited to this.

[0093] Here, the cover plate 130 can be a glass plate, such as ultra-thin glass (UTG), but the present invention is not limited thereto. Here, the back film 140 can be a heat sink or a plastic sheet (PET), but the present invention is not limited thereto.

[0094] In one embodiment, the back film 140, the second connecting member 50, the flexible display panel 110, and the first adhesive layer 30 below the cover plate 130 can be cut flush, for example, by using a tool to cut along the first side S1 of the flexible display panel 110 to achieve a flush cutting effect and improve process convenience. Thus, the back film 140, the second connecting member 50, the flexible display panel 110, and the first adhesive layer 30 have the same length L2 in the first direction D1.

[0095] Specifically, in this embodiment, the flexible display panel 110 includes two opposing first side edges S1 extending parallel to the second direction D2 (i.e., the Y direction). The first adhesive layer 30 includes two opposing third side edges S3 parallel to and aligned with the first side edge S1.

[0096] In this embodiment, in the first direction D1, the length L1 of the cover plate 130 is greater than the length L2 of the first adhesive layer 30. In this way, the larger cover plate 130 can achieve both protective and aesthetic effects.

[0097] In this embodiment, the bending axis of the flexible display panel 110 is parallel to the first direction D1 and the display surface 113 ( Figure 3 ) is suitable for convex in the direction away from the substrate 120 to serve as a convex display. Figure 5A and Figure 5B As shown, in one embodiment, the display device 100 further includes a box body A1 and a base B1 for supporting the box body A1. The box body A1 has an opening A11, and the roller R1 is located in the box body A1. The flexible display panel 110 is unfolded or stored in a folding manner, for example, but the present invention is not limited thereto. In one embodiment, the box body A1 and the base B1 can be installed in Figure 1AThe seat 10 is provided, but the present invention is not limited thereto.

[0098] Under the above configuration, the size of the display screen of the flexible display panel 110 can be adjusted according to the usage scenario, which is very convenient. Figure 4 As shown, in the first direction D1, the first adhesive layer 30 (the adhesive closest to the flexible display panel 110) is the same length as the flexible display panel 110. Therefore, during folding, the first adhesive layer 30 completely secures the flexible display panel 110 to the upper material (e.g., the cover plate 130). Therefore, the flexible display panel 110 is less likely to pull on the first adhesive layer 30, causing the first adhesive layer 30 to peel, thereby improving the yield of the display device 100.

[0099] Please refer to Figure 4 In this embodiment, the substrate 120 is, for example, a SUS stainless steel plate, but the present invention is not limited thereto. In the first direction D1, the length L1 of the cover 130 is greater than the length L4 of the substrate 120 to avoid interference with the underlying structure and maintain the appearance.

[0100] In one embodiment, the display device 100 is assembled by, for example, first placing the backing film 140, the second connector 50, the flexible display panel 110, and the first adhesive layer 30 beneath the cover plate 130. The substrate 120 is then attached to the backing film 140 via the first connector 20. To prevent the first connector 20 from being exposed or causing adhesive to be pulled out, the first connector 20 is designed to be recessed. That is, in the first direction D1, the length L5 of the first connector 20 is less than the length L2 of the flexible display panel 110 and the first adhesive layer 30 above it, and the length L5 of the first connector 20 is less than the length L4 of the substrate 120 below it, but the present invention is not limited to this.

[0101] In other embodiments, the substrate can also be cut flush with the flexible display panel, whereby the length of the first connecting member can be equal to the length of the flexible display panel and the first adhesive layer thereon. The length of the first connecting member is not limited in this regard.

[0102] In this embodiment, in the first direction D1, the length L4 of the substrate 120 is equal to the length L2 of the flexible display panel 110. However, in other embodiments, in the first direction, the length of the substrate may be less than or equal to the length of the flexible display panel, and the present invention is not limited thereto.

[0103] In addition, please refer to Figure 3The display device 100 further includes a circuit board 170 and a flexible circuit substrate 190. The flexible circuit substrate 190 includes a driver chip 191 and a flexible circuit board 192, but the present invention is not limited thereto. The driver chip 191 can be used to provide the electrical signals required by the display medium on the flexible display panel 110, but is not limited thereto.

[0104] The following examples are provided for illustration purposes only. It should be noted that the following examples share the same component numbers and some of the details as the previous examples, with the same numbers used to represent the same or similar components, and descriptions of the same technical details omitted. For the omitted details, please refer to the previous examples, and the following examples will not be repeated.

[0105] Figure 6A and Figure 6B 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention at different section lines. Figure 6A and Figure 6B The front view of the display device can be referred to Figure 3 For example, Figure 6A The display device is shown in Figure 3 Schematic cross-sectional view of the section line AA'. Figure 6B The display device is shown in Figure 3 Schematic cross-sectional view of the section line BB'.

[0106] Please refer to Figure 6A The display device 100B of this embodiment includes a substrate 120B, a first connector 20B, a backing film 140B, a second connector 50B, a flexible display panel 110B, a first adhesive layer 30B, a touch panel TP, a second adhesive layer 60, a cover plate 130B, a bonding layer 40, and a protective member 160. The substrate 120B, the first connector 20B, the backing film 140B, the second connector 50B, the flexible display panel 110B, the first adhesive layer 30B, the touch panel TP, the second adhesive layer 60, the cover plate 130B, the bonding layer 40, and the protective member 160 are stacked in sequence in the Z direction.

[0107] In this embodiment, the touch panel TP is located below the cover plate 130B, which provides protection. The second adhesive layer 60 is located between the touch panel TP and the cover plate 130B. The touch panel TP is bonded to the cover plate 130B using the second adhesive layer 60, but the present invention is not limited thereto.

[0108] In this embodiment, the touch panel TP is on the top side 111B of the flexible display panel 110B. The touch panel TP is located on the first adhesive layer 30B to avoid being blocked, but this is not limiting. In other embodiments, the top side 111B of the flexible display panel 110B may also be configured with an anti-reflection layer, an anti-fingerprint layer, or a hard coat, and the present invention does not limit this.

[0109] In this embodiment, the bonding layer 40 is on the cover plate 130B. Specifically, the bonding layer 40 is between the protective member 160 and the cover plate 130B, and the cover plate 130B is bonded to the protective member 160 by the bonding layer 40. Here, the protective member 160 can be a plate-like body made of glass, but the present invention is not limited thereto.

[0110] In this embodiment, the flexible display panel 110B is adapted to bulge outward in the positive Z direction. The adhesive material closer to the top side 111B of the flexible display panel 110B needs to bear a larger shear strain. Therefore, placing the adhesive material with a smaller storage modulus at the position where the shear strain to be borne is relatively large can reduce the chance of peeling when the adhesive material is bent. Specifically, the storage modulus of the adhesive material on the top side 111B of the flexible display panel 110B is greater than the storage modulus of the adhesive material on the bottom side 112 of the flexible display panel 110B, making the overall resilience of the display device 100B better.

[0111] Furthermore, the material on the top side 111B of the flexible display panel 110B is in tensile stress. Since the cover plate 130 is made of a relatively hard material (applying pressure), the compressive stress borne by the second adhesive layer 60 under the cover plate 130 is greater than that of the bonding layer 40. Therefore, on the top side 111B of the flexible display panel 110B, the adhesive material layer closest to the display surface (that is, closest to the top side 111B) has the greatest shear strain resistance. Accordingly, the storage modulus of the adhesive material on the top side 111B of the flexible display panel 110B increases in the positive Z direction. The storage modulus of the adhesive material on the bottom side 112 of the flexible display panel 110B increases in the negative Z direction.

[0112] In one embodiment, if the storage modulus of the bonding layer 40 is denoted as SA and the storage modulus of the second adhesive layer 60 is denoted as SB, then 5 < SA / SB < 10, to avoid too large differences in material properties, but this is not limiting.

[0113] In this configuration, the storage modulus of the first adhesive layer 30B is lower than that of the second adhesive layer 60, which in turn is lower than that of the bonding layer 40. Furthermore, the storage modulus of the second adhesive layer 60 is lower than that of the first and second connectors 20B and 50B. The storage modulus of the second connector 50B is lower than that of the first connector 20B, and the storage modulus of the first adhesive layer 30B is between 20% and 60% of that of the second connector 50B. This reduces the likelihood of peeling in the first adhesive layer 30B and prevents significant differences in material properties, although the present invention is not limited thereto.

[0114] In this embodiment, the first adhesive layer 30B, the second adhesive layer 60, and the bonding layer 40 above the flexible display panel 110B can be a film-like optically clear adhesive (OCA) or a liquid optically clear resin. In other embodiments, the first adhesive layer 30B, the second adhesive layer 60, and the bonding layer 40 can also be non-transparent, and the present invention is not limited to this. In one embodiment, the bonding layer 40 is black OCA, but the present invention is not limited to this.

[0115] In this embodiment, the first connecting member 20B and the second connecting member 50B below the flexible display panel 110B may be pressure sensitive adhesive (PSA), double-sided tape, or an adhesive with a substrate in between, which is easy to attach and inexpensive. In other embodiments, the first connecting member 20B and the second connecting member 50B may also be OCA, but the present invention is not limited thereto.

[0116] In detail, in one embodiment, the back film 140B, the second connecting member 50B, the flexible display panel 110B, the first adhesive layer 30B, the touch panel TP, and the second adhesive layer 60 under the cover plate 130B are cut flush. In other words, the back film 140B, the second connecting member 50B, the flexible display panel 110B, the first adhesive layer 30B, the touch panel TP, and the second adhesive layer 60 have the same length L2 in the first direction D1.

[0117] For further information, please refer to Figure 6A In this embodiment, the flexible display panel 110B includes two opposing first side edges S1 extending parallel to the second direction D2 (i.e., the Y direction). In the first direction D1, the touch panel TP includes two opposing fourth side edges S4 parallel to and aligned with the first side edge S1.

[0118] In this embodiment, the bending axis of the flexible display panel 110B is parallel to the first direction D1 and the display surface 113 ( Figure 3 ) is suitable for convexing in a direction away from the substrate 120.

[0119] In one embodiment, the display device 100 is assembled by, for example, first placing the backing film 140B, the second connector 50B, the flexible display panel 110B, the first adhesive layer 30B, the touch panel TP, and the second adhesive layer 60 beneath the cover plate 130B. The substrate 120B is then attached to the backing film 140B via the first connector 20B. To prevent the first connector 20B from being exposed or causing adhesive to be pulled out, the first connector 20B is designed to be recessed. That is, in the first direction D1, the length L5 of the first connector 20B is less than the length L2 of the flexible display panel 110B and the first adhesive layer 30B above it, and the length L5 of the first connector 20B is less than the length L4 of the substrate 120B below it, but the present invention is not limited to this.

[0120] Please refer to Figure 6A In the first direction D1, the length L7 of the bonding layer 40 is greater than the length L2 of the first adhesive layer 30B, the length L7 of the bonding layer 40 is greater than the length L5 of the first connecting member 20B, and the length L7 of the bonding layer 40 is greater than the length L1 of the cover plate 130B.

[0121] Please refer to Figure 6B In one embodiment, in the second direction D2, the length of the flexible display panel 110B is greater than the lengths of the second adhesive layer 60, the first adhesive layer 30B, and the touch panel TP. Here, the second adhesive layer 60 and the first adhesive layer 30B have a length 31, and the touch panel TP has a length TP1. The length TP1 of the touch panel TP is greater than the length 31 of the second adhesive layer 60 and the first adhesive layer 30B, and the length TP1 of the touch panel TP is less than the length L2' of the flexible display panel 110B.

[0122] Specifically, in this embodiment, the flexible display panel 110 includes two opposing second sides S2 extending parallel to the first direction D1 (i.e., the X-direction). The second adhesive layer 60, the first adhesive layer 30B, and the touch panel TP are recessed within the second sides S2 of the flexible display panel 110. This allows the top sides 111B on the left and right edges of the flexible display panel 110 to be partially exposed, serving as bonding locations for the driver chip 191B.

[0123] In one embodiment, in the second direction D2, the length TP1 of the touch panel TP is greater than the length 31 of the second adhesive layer 60. The second adhesive layer 60 is recessed from the fifth side S5 of the touch panel TP. This allows the top side TP2 of the touch panel TP to be partially exposed, serving as the bonding location for the driver chip 191B.

[0124] Specifically, in this embodiment, in the second direction D2, the length L7' of the bonding layer 40 is greater than the length 31 of the first adhesive layer 30B, the length L7' of the bonding layer 40 is greater than the length L5' of the first connecting member 20B, and the length L7' of the bonding layer 40 is greater than the length L1' of the cover plate 130B.

[0125] In more detail, Figure 6A As shown, in one embodiment, in the first direction D1, the length L2 of the flexible display panel 110B is greater than the length L4 of the substrate 120, but the present invention is not limited to this. In other embodiments, in the first direction, the length of the flexible display panel may be less than or equal to the length of the substrate, but the present invention is not limited to this. In one embodiment, in the first direction D1, the length L2 of the second adhesive layer 60 is greater than the length L5 of the first connector 20B, but the present invention is not limited to this. In other embodiments, in the first direction, the length of the second adhesive layer is equal to the length of the first connector, but the present invention is not limited to this.

[0126] like Figure 6B As shown, in this embodiment, in the second direction D2, the length L2' of the flexible display panel 110B is greater than the length L4' of the substrate 120B, but the present invention is not limited to this. In other embodiments, the length of the flexible display panel in the second direction may be less than or equal to the length of the substrate, but the present invention is not limited to this. In one embodiment, in the second direction D2, the length 31 of the second adhesive layer 60 is equal to the length L5' of the first connecting member 20B, but the present invention is not limited to this. In other embodiments, in the second direction, the length of the second adhesive layer is greater than the length of the first connecting member, but the present invention is not limited to this.

[0127] Figure 7A FIG is a cross-sectional view of a display device according to an embodiment of the present invention. Figure 7A In this embodiment, the display device 100C and Figure 6A The display device 100B is slightly different from the display device 100C. The main difference is that the display device 100C further includes a light shielding member 180 disposed on the cover plate 130B. The thickness H1 of the bonding layer 40 in the normal direction N1 is greater than the thickness H2 of the second adhesive layer 60 in the normal direction N1. Here, the light shielding member 180 is, for example, a black matrix. On the XY plane, the light shielding member 180 is arranged in a U-shaped pattern, but the present invention is not limited to this.

[0128] Figure 7B FIG is a cross-sectional view of a display device according to an embodiment of the present invention. In this embodiment, the display device 100D and Figure 7A The display device 100C is slightly different, the main differences being that the light shielding member 180D is disposed below the cover plate 130B, and the thickness H3 of the bonding layer 40 in the normal direction N1 is less than the thickness H4 of the second adhesive layer 60 in the normal direction N1.

[0129] In summary, in the display device of the present invention, the flexible display panel is adapted to bulge upward. The first adhesive layer above the flexible display panel includes two opposing third sides that are parallel and aligned with the two first sides of the flexible display panel. This ensures that, during folding, the first adhesive layer completely secures the flexible display panel to the upper material. Consequently, the flexible display panel is less likely to pull on the first adhesive layer, causing it to peel, thereby improving yield.

[0130] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A display device comprising: A flexible display panel having a top side and a bottom side opposite to each other; a substrate located on the bottom side, having a normal direction, a first direction and a second direction perpendicular to the normal direction, wherein the first direction is perpendicular to the second direction; a cover plate located on the top side; a first connecting member located between the substrate and the flexible display panel; and a first adhesive layer located between the cover plate and the flexible display panel, The flexible display panel includes two opposite first sides and two opposite second sides, wherein the extension direction of the two first sides is parallel to the second direction, and the extension direction of the two second sides is parallel to the first direction. The bending axis of the flexible display panel is parallel to the first direction and the display surface of the flexible display panel is adapted to bulge outward in a direction away from the substrate. The first adhesive layer includes two opposite third sides, the two third sides are parallel and aligned with the two first sides, In the first direction, the length of the cover plate is greater than the length of the first adhesive layer. 2 . The display device as claimed in claim 1 , wherein in the first direction, a length of the cover plate is greater than a length of the substrate. 3 . The display device as claimed in claim 1 , wherein a length of the first connecting member is less than or equal to a length of the flexible display panel. The display device as claimed in claim 1 , wherein a length of the first connecting member is less than or equal to a length of the substrate. The display device as claimed in claim 1 , wherein a length of the first connecting member is less than or equal to a length of the first adhesive layer. 6 . The display device as claimed in claim 1 , wherein a storage modulus of the first adhesive layer is between 20% and 60% of a storage modulus of the first connecting member.

7. The display device as described in claim 1 further includes a bonding layer located on the cover plate, and the length of the bonding layer in the first direction and the second direction is greater than the length of the first adhesive layer, the length of the bonding layer is greater than the length of the first connecting member, and the length of the bonding layer is greater than the length of the cover plate. 8 . The display device as claimed in claim 7 , further comprising a protection member, wherein the bonding layer is located between the protection member and the cover plate.

9. The display device according to claim 7, further comprising: a second connecting member located between the bottom side and the first connecting member; as well as A back film is located between the second connecting member and the first connecting member.

10. The display device according to claim 9, further comprising: a touch panel located on the first adhesive layer, the touch panel comprising two opposite fourth sides, the two fourth sides being parallel to and aligned with the first side; as well as A second adhesive layer is located between the touch panel and the cover plate. In the first direction, the length of the second adhesive layer is equal to the length of the first adhesive layer. 11 . The display device as claimed in claim 10 , wherein in the second direction, a length of the flexible display panel is greater than a length of the second adhesive layer, the first adhesive layer, and the touch panel. 12 . The display device as claimed in claim 10 , wherein in the second direction, a length of the touch panel is greater than a length of the second adhesive layer. 13 . The display device as claimed in claim 10 , wherein in the first direction and the second direction, a length of the second adhesive layer is greater than or equal to a length of the first connecting member. 14 . The display device according to claim 10 , wherein the storage modulus of the first adhesive layer is smaller than that of the second adhesive layer, and the storage modulus of the second adhesive layer is smaller than that of the first connector. 15 . The display device according to claim 10 , wherein the storage modulus of the first adhesive layer is smaller than that of the second adhesive layer, and the storage modulus of the second adhesive layer is smaller than that of the second connector. 16 . The display device as claimed in claim 10 , further comprising a light shielding member disposed on the cover plate, wherein a thickness of the bonding layer in the normal direction is greater than a thickness of the second adhesive layer in the normal direction. 17 . The display device as claimed in claim 10 , further comprising a light shielding member disposed under the cover plate, wherein a thickness of the second adhesive layer in the normal direction is greater than a thickness of the bonding layer in the normal direction. 18 . The display device as claimed in claim 9 , wherein a storage modulus of the first adhesive layer is between 20% and 60% of a storage modulus of the second connecting member.

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