Display device

Abstract

The application discloses a display device, comprising a flexible display panel, a sealing glue and a first reinforcing structure. The flexible display panel comprises a lower substrate, an upper substrate and a display medium layer between the lower substrate and the upper substrate. The lower substrate and the upper substrate each have an edge area. The center line of the flexible display panel is parallel to the short side of the flexible display panel. The sealing glue is between the edge area of the lower substrate and the edge area of the upper substrate. The first reinforcing structure is between the sealing glue, the edge area of the lower substrate and the edge area of the upper substrate. The center line of the flexible display panel passes through the first reinforcing structure, and the elastic modulus of the first reinforcing structure is greater than that of the sealing glue. When the display device is bent, the edge area of the lower substrate and the edge area of the upper substrate are relatively stable at the position adjacent to the center line, and the strain generated by the bending can be dispersed on the opposite sides of the display device, so that the single-side dislocation and delamination can be avoided.

Description

[0001] This application is a divisional application of the patent application filed on July 19, 2019, with application number 201910653346.4 and title "Display Device". Technical Field

[0002] This invention relates to a display device, and more particularly to a display device having a flexible display panel. Background Technology

[0003] Flexible display panels are widely used as display screens in various consumer electronics products today, such as electronic paper. The display medium layer of a flexible display panel is mainly composed of an electrophoretic solution and white and black particles mixed in the electrophoretic solution. By applying voltage to the display medium layer, the white and black particles can be driven to move, so that each pixel area displays black, white, or grayscale respectively. Since flexible display panels achieve the purpose of display by reflecting incident light (such as sunlight or indoor ambient light) onto the display medium layer, no backlight is required, thus saving power consumption.

[0004] However, when a display device with a flexible display panel is bent, misalignment occurs between the inner and outer edges due to the device's thickness. In other words, the inner layer shrinks inward compared to the outer layer. If misalignment occurs only on one side of the display device, accumulated stress and strain can easily lead to delamination. Summary of the Invention

[0005] The purpose of this invention is to provide a display device in which the edge areas of the lower substrate and the upper substrate are relatively stable near the center line, and the strain generated by bending can be distributed on the opposite sides of the display device, thereby avoiding unilateral misalignment and delamination.

[0006] According to one embodiment of the present invention, a display device includes a flexible display panel, a sealant, and a first reinforcing structure. The flexible display panel includes a lower substrate, an upper substrate, and a display dielectric layer located between the lower substrate and the upper substrate. The lower substrate and the upper substrate each have an edge region. The centerline of the flexible display panel is parallel to the short side of the flexible display panel. The sealant is located between the edge regions of the lower substrate and the upper substrate. The first reinforcing structure is located between the sealant, the edge regions of the lower substrate, and the edge regions of the upper substrate. The centerline of the flexible display panel passes through the first reinforcing structure, and the elastic modulus of the first reinforcing structure is greater than the elastic modulus of the sealant.

[0007] In one embodiment of the present invention, the first reinforcing structure is a thermosetting adhesive or a photocurable adhesive.

[0008] In one embodiment of the present invention, the elastic modulus of the first reinforcing structure is in the range of 3 GPa to 4 GPa.

[0009] In one embodiment of the present invention, the display device further includes an upper protective layer and an adhesive layer. The adhesive layer is located between the upper protective layer and the upper substrate.

[0010] In one embodiment of the present invention, the display device further includes a second reinforcing structure. The second reinforcing structure is located between the edge regions of the upper protective layer, the adhesive layer, and the upper substrate, and the centerline of the flexible display panel passes through the second reinforcing structure.

[0011] In one embodiment of the present invention, the display device further includes a lower protective layer and an adhesive layer. The adhesive layer is located between the lower protective layer and the lower substrate.

[0012] In one embodiment of the present invention, the display device further includes a second reinforcing structure. The second reinforcing structure is located between the edge regions of the lower protective layer, the adhesive layer, and the lower substrate, and the centerline of the flexible display panel passes through the second reinforcing structure.

[0013] In one embodiment of the present invention, the display device has an air gap located between the edge region of the lower substrate, the display medium layer, the edge region of the upper substrate, and the adhesive layer, and the extending direction of the air gap is parallel to the center line.

[0014] In one embodiment of the present invention, the display device further includes a support member. The support member is located in the air gap and on the edge region of the lower substrate.

[0015] In one embodiment of the present invention, the display device further includes a first guide rail and a plurality of second guide rails. The centerline of the flexible display panel passes through the first guide rail. The second guide rails are pivotally connected to each other, and two of the second guide rails are pivotally connected to opposite sides of the first guide rail. The flexible display panel is accommodated in the first guide rail and the second guide rails, wherein the rigidity of the first guide rail is greater than the rigidity of the second guide rails.

[0016] In one embodiment of the present invention, the first guide rail is made of metal and the second guide rail is made of rubber.

[0017] In one embodiment of the present invention, the display device further includes a second reinforcing structure. The second reinforcing structure is located between the first guide rail and the flexible display panel.

[0018] In the above embodiments of the present invention, since the centerline of the flexible display panel passes through the first reinforcing structure, and the elastic modulus of the first reinforcing structure is greater than that of the sealant, the edge areas of the lower substrate and the upper substrate are more stable near the centerline when the display device is bent. In this way, the strain generated by bending can be distributed on opposite sides of the display device, avoiding unilateral misalignment and delamination.

[0019] According to one embodiment of the present invention, a display device includes a flexible display panel, an upper protective layer, a first adhesive layer, a lower protective layer, and a second adhesive layer. The flexible display panel includes a lower substrate, an upper substrate, and a display dielectric layer located between the lower substrate and the upper substrate, wherein the centerline of the flexible display panel is parallel to the short side of the flexible display panel. The first adhesive layer is located between the upper protective layer and the upper substrate. The second adhesive layer is located between the lower protective layer and the lower substrate, wherein at least one of the first adhesive layer and the second adhesive layer near the centerline has greater adhesion or elasticity than that away from the centerline.

[0020] In one embodiment of the present invention, the upper protective layer has a recess or a protrusion that contacts the first adhesive layer, and the centerline of the flexible display panel passes through the recess or the protrusion.

[0021] In one embodiment of the present invention, the upper substrate has a recess or a protrusion that contacts the first adhesive layer, and the centerline of the flexible display panel passes through the recess or the protrusion.

[0022] In one embodiment of the present invention, the lower protective layer has a recess or a protrusion that contacts the second adhesive layer, and the centerline of the flexible display panel passes through the recess or the protrusion.

[0023] In one embodiment of the present invention, the display device has an air gap located between the edge region of the lower substrate, the display medium layer, the edge region of the upper substrate and the first adhesive layer, and the extending direction of the air gap is parallel to the center line.

[0024] In one embodiment of the present invention, the display device further includes a support member. The support member is located in the air gap and on the edge region of the lower substrate.

[0025] In one embodiment of the present invention, the display device further includes a first guide rail and a plurality of second guide rails. The centerline of the flexible display panel passes through the first guide rail. The second guide rails are pivotally connected to each other, and two of the second guide rails are pivotally connected to opposite sides of the first guide rail. The flexible display panel is accommodated in the first guide rail and the second guide rails, wherein the rigidity of the first guide rail is greater than the rigidity of the second guide rails.

[0026] In one embodiment of the present invention, the first guide rail is made of metal and the second guide rail is made of rubber.

[0027] In one embodiment of the present invention, the display device further includes a reinforcing structure. The reinforcing structure is located between the first guide rail and the flexible display panel.

[0028] In the above embodiments of the present invention, the adhesiveness or elasticity of the first or second adhesive layer located near the center line of the flexible display panel is greater than that located away from the center line. Therefore, when the display device is bent, the upper and lower protective layers are more stable near the center line. In this way, the strain caused by bending can be distributed on opposite sides of the display device, avoiding unilateral misalignment and delamination.

[0029] According to one embodiment of the present invention, a display device includes a flexible display panel, an upper protective layer, a first adhesive layer, a lower protective layer, and a second adhesive layer. The flexible display panel includes a lower substrate, an upper substrate, and a display medium layer located between the lower substrate and the upper substrate, wherein the centerline of the flexible display panel is parallel to the short side of the flexible display panel. The first adhesive layer is located between the upper protective layer and the upper substrate. The second adhesive layer is located between the lower protective layer and the lower substrate. At least one of the upper protective layer, the upper substrate, and the lower protective layer has a recess or a protrusion, the recess or protrusion contacting one of the first adhesive layer and the second adhesive layer, and the centerline passing through the recess or protrusion.

[0030] In one embodiment of the present invention, the display device has an air gap located between the edge region of the lower substrate, the display medium layer, an edge region of the upper substrate and the first adhesive layer, and the extending direction of the air gap is parallel to the center line.

[0031] In one embodiment of the present invention, the display device further includes a support member. The support member is located in the air gap and on the edge region of the lower substrate.

[0032] In one embodiment of the present invention, the display device further includes a first guide rail and a plurality of second guide rails. The centerline of the flexible display panel passes through the first guide rail. The second guide rails are pivotally connected to each other, and two of the second guide rails are pivotally connected to opposite sides of the first guide rail. The flexible display panel is accommodated in the first guide rail and the second guide rails, wherein the rigidity of the first guide rail is greater than the rigidity of the second guide rails.

[0033] In one embodiment of the present invention, the first guide rail is made of metal and the second guide rail is made of rubber.

[0034] In one embodiment of the present invention, the display device further includes a reinforcing structure. The reinforcing structure is located between the first guide rail and the flexible display panel.

[0035] In the above embodiments of the present invention, since the upper protective layer, the upper substrate, and the lower protective layer may have recesses or convexities, and these recesses or convexities can contact the first adhesive layer and the second adhesive layer and pass through the center line, when the display device is bent, the upper protective layer, the upper substrate, and the lower protective layer can contact more adhesive layer at their respective recesses or convexities than in other areas, making the upper protective layer, the upper substrate, and the lower protective layer more stable near the center line. In this way, the strain generated by bending can be distributed on opposite sides of the display device, avoiding unilateral misalignment and delamination.

[0036] According to one embodiment of the present invention, a display device includes a flexible display panel, a first guide rail, a plurality of second guide rails, and a reinforcing structure. The flexible display panel has a center line parallel to its short side. The center line of the flexible display panel passes through the first guide rail. The second guide rails are pivotally connected to each other, and two of the second guide rails are pivotally connected to opposite sides of the first guide rail. The flexible display panel is housed within the first and second guide rails, wherein the rigidity of the first guide rail is greater than the rigidity of the second guide rails. The reinforcing structure is located between the first guide rail and the flexible display panel.

[0037] In one embodiment of the present invention, the first guide rail is made of metal and the second guide rail is made of rubber.

[0038] In one embodiment of the present invention, the display device has an air gap located between the edge region of the lower substrate, the display medium layer, the edge region of the upper substrate and the first adhesive layer, and the extending direction of the air gap is parallel to the center line.

[0039] In one embodiment of the present invention, the display device further includes a support member. The support member is located in the air gap and on the edge region of the lower substrate.

[0040] In the above embodiments of the present invention, since the hardness of the first guide rail through which the center line passes is greater than that of the second guide rail, and the reinforcing structure is located between the first guide rail and the flexible display panel, the display device is more stable near the center line when it is bent. In this way, the strain generated by bending can be distributed on opposite sides of the display device, avoiding unilateral misalignment and delamination. Attached Figure Description

[0041] Figure 1 A top view of a display device according to an embodiment of the present invention is shown;

[0042] Figure 2 Draw Figure 1 A cross-sectional view of the display device along line segment 2-2;

[0043] Figure 3 Draw Figure 1 A cross-sectional view of the display device along line segment 3-3;

[0044] Figure 4 Draw Figure 1 A cross-sectional view of the display device along line segment 4-4;

[0045] Figure 5 A cross-sectional view of a display device according to an embodiment of the present invention is shown, the cross-sectional position being... Figure 4 same;

[0046] Figure 6 A side view of a display device according to an embodiment of the present invention is shown;

[0047] Figure 7 Draw Figure 6 A cross-sectional view of the display device along line segment 7-7;

[0048] Figure 8 Draw Figure 6 A cross-sectional view of the display device along line segment 8-8;

[0049] Figure 9 A top view of a display device according to an embodiment of the present invention is shown;

[0050] Figure 10 Draw Figure 9 A cross-sectional view of the display device along line segment 10-10;

[0051] Figure 11 A top view of a display device according to an embodiment of the present invention is shown;

[0052] Figure 12 Draw Figure 11 A cross-sectional view of the display device along line segment 12-12;

[0053] Figure 13 A top view of a display device according to an embodiment of the present invention;

[0054] Figure 14A A top view of a display device according to an embodiment of the present invention is shown;

[0055] Figure 14B Draw Figure 14A A cross-sectional view of the display device along the center line L;

[0056] Figure 15A A top view of a display device according to an embodiment of the present invention is shown;

[0057] Figure 15B Draw Figure 15A A cross-sectional view of the display device along the center line L.

[0058] Explanation of key figure labels:

[0059] 100, 100a, 100b, 100c, 100d, 100e, 100f - Display device; 110, 110a - Flexible display panel; 112, 112a, 112b - Lower substrate; 113 - Edge region; 114 - Upper substrate; 115 - Edge region; 116, 116a - Display dielectric layer; 120 - Sealant; 130, 130a, 130b, 130c - Reinforcing structure; 140, 140a - Upper protective layer; 150a, 150 b, 150c, 150d - Adhesive layer; 160, 160a - Lower protective layer; 170 - Support; 180a - First guide rail; 180b - Second guide rail; 192, 192a, 192b - Recess; 194 - Protrusion; 2-2, 3-3, 4-4, 7-7, 8-8, 10-10 - Line segments; A1, A2, A3 - Areas; D, D1, D2 - Directions; G - Air gap; L - Centerline; O1, O2 - Openings; S1, S2 - Accommodation space. Detailed Implementation

[0060] Several embodiments of the present invention will be disclosed below with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some well-known and conventional structures and elements will be illustrated in the drawings in a simple schematic manner.

[0061] Figure 1 A top view of a display device 100 according to an embodiment of the present invention is shown. Figure 2 Draw Figure 1 A cross-sectional view of the display device 100 along line segment 2-2. Figure 3 Draw Figure 1 A cross-sectional view of the display device 100 along line segment 3-3. See also... Figures 1 to 3 The display device 100 includes a flexible display panel 110, a sealant 120 (e.g., encapsulation frame adhesive), and a reinforcing structure 130. The flexible display panel 110 includes a lower substrate 112, an upper substrate 114, and a display dielectric layer 116 located between the lower substrate 112 and the upper substrate 114. The lower substrate 112 may be made of polyimide (PI) and has a thin-film transistor array (TFT array). The display dielectric layer 116 includes a colloid and microcapsules containing charged particles. The display dielectric layer 116 can be used to reflect incident light. Charged particles include, but are not limited to, black and white particles. Furthermore, the colloid may be a pressure-sensitive adhesive (PSA).

[0062] The lower substrate 112 and the upper substrate 114 each have an edge region 113 and an edge region 115, respectively. Edge regions 113 and 115 can be considered as the peripheral encapsulation areas of the flexible display panel 110. Sealant 120 is located between the edge region 113 of the lower substrate 112 and the edge region 115 of the upper substrate 114. The centerline L of the flexible display panel 110 is parallel to the short side of the flexible display panel 110; in other words, the centerline L is perpendicular to the long side of the flexible display panel 110. In this embodiment, a reinforcing structure 130 is provided near the centerline L. The elastic modulus of the reinforcing structure 130 is greater than that of the sealant 120, yet it still possesses sealing properties; it can be another type of sealant. The reinforcing structure 130 is located between the sealant 120, the edge region 113 of the lower substrate 112, and the edge region 115 of the upper substrate 114. The centerline L of the flexible display panel 110 passes through the reinforcing structure 130, and the elastic modulus of the reinforcing structure 130 is greater than that of the sealant 120.

[0063] In this embodiment, the reinforcing structure 130 can be a thermosetting adhesive or a photocurable adhesive, possessing high adhesion and high elasticity. The elastic modulus of the reinforcing structure 130 can be in the range of 3 GPa to 4 GPa, while the elastic modulus of the sealant 120 is approximately below 1 GPa. The display device 100 (or flexible display panel 110) can be bent or rolled along its long side. When the display device 100 is bent, the edge region 113 of the lower substrate 112 and the edge region 115 of the upper substrate 114 are relatively stable near the center line L. In this way, the strain generated by bending can be distributed on opposite sides of the display device 100 (e.g., Figure 1 The two short sides (top and bottom) are bent to avoid unilateral misalignment and delamination. In this document, "bending" includes winding, which will be stated earlier.

[0064] In this embodiment, the display device 100 further includes an upper protective layer 140, an adhesive layer 150a, and a reinforcing structure 130a. The adhesive layer 150a is located between the upper protective layer 140 and the upper substrate 114. The reinforcing structure 130a is located between the upper protective layer 140, the adhesive layer 150a, and the edge region 115 of the upper substrate 114, and the center line L of the flexible display panel 110 passes through the reinforcing structure 130a. Similarly, the display device 100 may also include a lower protective layer 160, an adhesive layer 150b, and a reinforcing structure 130b. The adhesive layer 150b is located between the lower protective layer 160 and the lower substrate 112. The reinforcing structure 130b is located between the lower protective layer 160, the adhesive layer 150b, and the edge region 113 of the lower substrate 112, and the center line L of the flexible display panel 110 passes through the reinforcing structure 130b. The materials of the reinforcing structures 130a and 130b can be the same as those of the reinforcing structure 130. The adhesive layers 150a and 150b can be optical clear adhesive (OCA) or pressure-sensitive adhesive (PSA), but this is not intended to limit the invention. When the display device 100 is bent, the upper protective layer 140 and the lower protective layer 160 are relatively stable near the centerline L, and the strain caused by bending can be distributed on opposite sides of the display device 100 (e.g., ...). Figure 1 (The two short sides at the top and bottom) to avoid unilateral misalignment and delamination.

[0065] It should be understood that the component connections, materials, and functions already described will not be repeated, but will be stated in advance.

[0066] The above design improves interlayer stability in the center region of the long side of the display device 100. In the following description, the design for improving interlayer stability on the short side of the display device 100 will be described.

[0067] Figure 4 Draw Figure 1 A cross-sectional view of the display device 100 along line segment 4-4. See also... Figure 1 and Figure 4The display device 100 has an air gap G. The air gap G is located between the edge region 113 of the lower substrate 112, the display dielectric layer 116, the edge region 115 of the upper substrate 114, and the adhesive layer 150a, and the air gap G extends parallel to the center line L. At the short side of the display device 100, the lower substrate 112 protrudes beyond the display dielectric layer 116 and the upper substrate 114, allowing the upper protective layer 140 to be bonded using the adhesive layer 150a. That is, a portion of the edge region 113 of the lower substrate 112 is not covered by the display dielectric layer 116 and the upper substrate 114. In this way, when the display device 100 is bent, the air gap G allows for slight displacement between the upper protective layer 140 and the flexible display panel 110, preventing interlayer displacement from concentrating in the area near the center line L of the display device 100 and causing delamination.

[0068] Figure 5 A cross-sectional view of a display device 100 according to an embodiment of the present invention is shown, the cross-sectional position being... Figure 4 Same. With Figure 4 The difference in implementation methods lies in, Figure 5 The display device 100 also includes a support member 170. The support member 170 is located in the air gap G and on the edge region 113 of the lower substrate 112. The support member 170 is disposed along the length direction of the air gap G. During manufacturing... Figure 5 When the display device 100 is used, a support member 170 can be first set on the short side of the lower substrate 112 to define a reserved space. In this way, when the upper protective layer 140 is pressed and bonded by the adhesive layer 150a, the bonding position of the adhesive layer 150a will be closer to the side of the lower substrate 112 due to the abutment of the support member 170, leaving a reserved space and forming an air gap G. In this embodiment, the support member 170 can be a thin strip of polyethylene terephthalate (PET) tape or polyimide (PI) tape, but this is not intended to limit the invention.

[0069] Figure 6 A side view of a display device 100a according to an embodiment of the present invention is shown. Figure 7 Draw Figure 6 A cross-sectional view of the display device 100a along line segment 7-7. Figure 8 Draw Figure 6 A cross-sectional view of the display device 100a along line segment 8-8. See also... Figures 6 to 8 The display device 100a includes a first guide rail 180a, a plurality of second guide rails 180b, and Figure 1The display device 100. A first guide rail 180a and a second guide rail 180b can be mounted on a housing. The first guide rail 180a and the second guide rail 180b cover the bottom and sides of the display device 100 and extend at least partially to the top surface of the display device 100. The first guide rail 180a and the second guide rail 180b respectively have accommodating spaces S1 and S2 to accommodate a flexible display panel 110 (see...). Figure 3 The display device 100 has a first guide rail 180a and a second guide rail 180b, each having an opening O1 and an opening O2, respectively. Opening O1 connects to a receiving space S1, and opening O2 connects to a receiving space S2. When the display device 100 is rotated in direction D, it can move along the receiving space S2 of the second guide rail 180b. The opening O1 of the first guide rail 180a and the opening O2 of the second guide rail 180b expose the display area on the top surface of the display device 100 for viewing by the user.

[0070] Furthermore, the display device 100a also includes a reinforcing structure 130c. The reinforcing structure 130c is located between the first guide rail 180a and the display device 100. For more details, see [link to documentation]. Figure 3 The reinforcing structure 130c is located between the first guide rail 180a and the upper protective layer 140, and between the first guide rail 180a and the lower protective layer 160. In other words, the reinforcing structure 130c is located between the first guide rail 180a and the flexible display panel 110. In this embodiment, the first guide rail 180a is located on the centerline L (see also...). Figure 1 The second guide rails 180b are pivotally connected to each other, and two of the second guide rails 180b are pivotally connected to opposite sides of the first guide rail 180a, not passing through the center line L. The hardness of the first guide rail 180a is greater than that of the second guide rail 180b. For example, the first guide rail 180a can be made of metal (e.g., stainless steel), and the second guide rail 180b can be made of rubber.

[0071] The reinforcing structure 130c can be adhered to the display device 100. When the display device 100a is rolled in direction D, the display device 100 in the accommodating space S1 cannot move, only the display device 100 in the accommodating space S2 can move along the second guide rail 180b. At half the length of the fully unfolded display device 100a (i.e., the position where the center line L passes), the reinforcing structure 130c can fix the upper protective layer 140 and the lower protective layer 160 in the first guide rail 180a. This fixing method restricts the relative position of the upper protective layer 140 and the lower protective layer 160 in the first guide rail 180a to remain completely unchanged whether the display device 100a is unfolded or rolled up. In this way, when the upper protective layer 140 and the lower protective layer 160 undergo interlayer displacement due to bending, it will only move towards the two short sides of the display device 100 (i.e., Figure 6The material of the reinforcing structure 130c can be epoxy resin, but it is not limited to this.

[0072] Because the hardness of the first guide rail 180a, through which the centerline L passes, is greater than that of the second guide rail 180b, and the reinforcing structure 130c is located between the first guide rail 180a and the flexible display panel 110 (see... Figure 3 The display devices 100a are positioned such that when the display device 100a is bent, it is more stable near the center line L. In this way, the strain caused by bending can be distributed on both sides of the display device 100a, thus avoiding unilateral misalignment and delamination.

[0073] Figure 9 A top view of a display device 100b according to an embodiment of the present invention is shown. Figure 10 Draw Figure 9 A cross-sectional view of the display device 100b along line segment 10-10. See also... Figure 9 and Figure 10 The display device 100b includes a flexible display panel 110, an upper protective layer 140, an adhesive layer 150c, a lower protective layer 160, and an adhesive layer 150d. The flexible display panel 110 includes a lower substrate 112, an upper substrate 114, and a display dielectric layer 116a. Figure 1 , Figure 3 The difference in the implementation is that the adhesiveness or elasticity of at least one of the adhesive layers 150c and 150d gradually increases in the direction D1, D2 toward the center line L of the flexible display panel 110, and the reinforcing structures 130, 130a, and 130b are omitted.

[0074] In this embodiment, the centerline L passes through region A1. Therefore, the adhesive layer 150c (or adhesive layer 150d) in region A1 has greater viscosity or elasticity than the adhesive layer 150c (or adhesive layer 150d) in region A2, and the adhesive layer 150c (or adhesive layer 150d) in region A2 has greater viscosity or elasticity than the adhesive layer 150c (or adhesive layer 150d) in region A3. The number of regions described above is not intended to limit the invention. During manufacturing, at least one of the adhesive layers 150c and 150d can be treated using a gradient curing method. For example, if adhesive layers 150c and 150d are thermosetting or ultraviolet (UV) curing adhesives, and higher energy (high power or longer time) is used to cure adhesive layers 150c and 150d in area A1 through which the centerline L passes, then the adhesiveness or elasticity of adhesive layers 150c and 150d in the area adjacent to the centerline L (e.g., area A1) will be higher than on the sides (e.g., area A3), causing the display device 100b to preferentially bend to the sides (e.g., when bent). Figure 9 The two short sides (top and bottom) are misaligned.

[0075] Because the adhesiveness or elasticity of the adhesive layers 150c and 150d gradually increases towards the centerline L of the flexible display panel 110, the upper protective layer 140 and the lower protective layer 160 are more stable near the centerline L when the display device 100b is bent. In this way, the strain caused by bending can be distributed on opposite sides of the display device 100b (e.g., ...). Figure 9 The two short sides (top and bottom) can prevent unilateral misalignment and delamination.

[0076] Figure 11 A top view of a display device 100c according to an embodiment of the present invention is shown. Figure 12 Draw Figure 11 A cross-sectional view of the display device 100c along line segment 12-12. See also... Figure 11 and Figure 12 The display device 100c includes a flexible display panel 110, an upper protective layer 140a, an adhesive layer 150a, a lower protective layer 160a, and an adhesive layer 150b. The flexible display panel 110 includes a lower substrate 112, an upper substrate 114, and a display medium layer 116. In this embodiment, the upper protective layer 140a, the adhesive layer 150a, the adhesive layer 150b, and the lower protective layer 160a all have recesses 192. The recesses 192 of the upper protective layer 140a and the lower protective layer 160a respectively contact the adhesive layers 150a and 150b, and the centerline L passes through the recesses 192.

[0077] When the upper protective layer 140a and the lower protective layer 160a are respectively attached to the flexible display panel 110, the upper protective layer 140a and the lower protective layer 160a have a larger attachment area in the region near the center line L, which can improve stability. Furthermore, the interlayer strain generated when the display device 100c is bent (or wound) will encounter geometric resistance from the recesses 192 of the upper protective layer 140a and the lower protective layer 160a in the region near the center line L. In this way, the interlayer strain can only move to both sides (e.g., Figure 11 The two short sides (upper and lower) are moved to avoid the interlayer strain from concentrating on one side and causing delamination.

[0078] Figure 13 A top view of a display device 100d according to an embodiment of the present invention. The display device 100d includes an upper protective layer 140a, an adhesive layer 150a, a lower protective layer 160a, and an adhesive layer 150b. Figure 11 The flexible display panel 110. With Figure 11The difference in the implementation method lies in that the upper protective layer 140a, adhesive layer 150a, lower protective layer 160a, and adhesive layer 150b of the display device 100d all have protrusions 194, and the center line L passes through the protrusions 194. The protrusions 194 of the upper protective layer 140a and the lower protective layer 160a respectively contact the adhesive layers 150a and 150b, and the center line L passes through the protrusions 194. This design can also have the aforementioned... Figure 11 The effect of the recess 192.

[0079] Figure 14A A top view of a display device 100e according to an embodiment of the present invention is shown. Figure 14B Draw Figure 14A A cross-sectional view of the display device 100e along the center line L. See also... Figure 14A and Figure 14B The display device 100e includes an upper protective layer 140a, an adhesive layer 150a, a lower protective layer 160a, an adhesive layer 150b, and a flexible display panel 110. In this embodiment, the upper substrate 114 and the display medium layer 116 are recessed within the lower substrate 112a; in other words, the lower substrate 112a protrudes from the upper substrate 114 and the display medium layer 116. Thus, the edges of the upper substrate 114 and the display medium layer 116 can jointly form a recess 192a, and the centerline L passes through the recess 192a. In this embodiment, the adhesive layer 150a contacts the adhesive layer 150b, the lower substrate 112a, and the upper substrate 114 sequentially from the outside to the inside, thereby increasing the additional adhesion area and creating geometric resistance in the region near the centerline L when the display device 100e is wound. Thus, interlayer strain can only be directed to both sides (e.g., ...). Figure 14A The two short sides (upper and lower) are moved to avoid the interlayer strain from concentrating on one side and causing delamination.

[0080] Figure 15A A top view of a display device 100f according to an embodiment of the present invention is shown. Figure 15B Draw Figure 15A A cross-sectional view of the display device along the center line L. See also... Figure 15A and Figure 15B The display device 100f includes an upper protective layer 140a, an adhesive layer 150a, a lower protective layer 160a, an adhesive layer 150b, and a flexible display panel 110a. Figure 14A , Figure 14BThe difference in the implementation method lies in that the edges of the upper substrate 114, the display dielectric layer 116, and the lower substrate 112b of the flexible display panel 110a are approximately aligned. In this way, the edges of the upper substrate 114, the display dielectric layer 116, and the lower substrate 112b can collectively form a recess 192b, and the centerline L passes through the recess 192b. In this embodiment, the adhesive layer 150a contacts the adhesive layer 150b and the upper substrate 114 sequentially from the outside to the inside, thus increasing the additional adhesion area and creating geometric resistance in the region near the centerline L when the display device 100f is wound. As a result, interlayer strain can only be directed to both sides (e.g., ...). Figure 15A The two short sides (upper and lower) are moved to avoid the interlayer strain from concentrating on one side and causing delamination.

[0081] The display device of the present invention can use the components and structures in the above embodiments independently or in combination, depending on the designer's needs.

[0082] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements 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 claims.

Claims

1. A display device, characterized by comprising: Include: A flexible display panel includes a lower substrate, an upper substrate, and a display medium layer located between the lower substrate and the upper substrate, wherein a center line of the flexible display panel is parallel to the short side of the flexible display panel. Upper protective layer; A first adhesive layer is located between the upper protective layer and the upper substrate; Lower protective layer; The second adhesive layer is located between the lower protective layer and the lower substrate, wherein at least one of the upper protective layer, the upper substrate and the lower protective layer has a recess or a protrusion, the recess or the protrusion contacts one of the first adhesive layer and the second adhesive layer, and the centerline passes through the recess or the protrusion. A first guide rail, wherein the centerline of the flexible display panel passes through the first guide rail; and A plurality of second guide rails are pivotally connected to each other, and two of the plurality of second guide rails are pivotally connected to opposite sides of the first guide rail. The flexible display panel is housed in the first guide rail and the plurality of second guide rails, wherein the rigidity of the first guide rail is greater than the rigidity of the plurality of second guide rails.

2. The display device of claim 1, wherein, It has an air gap located between the edge region of the lower substrate, the display medium layer, the edge region of the upper substrate and the first adhesive layer, and the extending direction of the air gap is parallel to the center line.

3. The display device of claim 2, wherein, Also includes: A support member is located in the air gap and on the edge region of the lower substrate.

4. The display device of claim 1, wherein The first guide rail is made of metal, and the plurality of second guide rails are made of rubber.

5. The display device of claim 1, wherein Also includes: A reinforcing structure is located between the first guide rail and the flexible display panel.

6. The display device of claim 1, wherein The upper protective layer, the upper substrate, and the lower protective layer all have the recessed portion.

7. The display device of claim 6, wherein Both the first adhesive layer and the second adhesive layer have recesses, and the plurality of recesses of the upper protective layer, the upper substrate and the lower protective layer are aligned with the plurality of recesses of the first adhesive layer and the second adhesive layer in the top view direction.

8. The display device of claim 1, wherein, The upper protective layer, the upper substrate, and the lower protective layer all have the protrusions.

9. The display device of claim 8, wherein, Both the first adhesive layer and the second adhesive layer have protrusions, and the plurality of protrusions of the upper protective layer, the upper substrate and the lower protective layer are aligned with the plurality of protrusions of the first adhesive layer and the second adhesive layer in the top view direction.

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