Display device

Abstract

A display device, the display device includes a first support member (1), a second support member (2) and a flexible display module (3); a gap (8) is provided between the second support member (2) and the first support member (1); the flexible display module (3) is disposed on the first surface (11) of the first support member (1) and the third surface (21) of the second support member (2); the area of the first surface (11) close to the second support member (2) is the first mating surface (111), and the area of the third surface (21) close to the first support member (1) is the third mating surface (211), and the first mating surface (111) and the third mating surface (211) are symmetrically arranged; the distance between at least part of the first mating surface (111) and the flexible display module (3) increases as the distance from the second support member (2) decreases, and the distance between at least part of the third mating surface (211) and the flexible display module (3) increases as the distance from the first support member (1) decreases, so that when the display device is folded inward, at least part of the flexible display module (3) contacts at least part of the first mating surface (111) and at least part of the third mating surface (211) to form a water droplet shape. The display device can meet the conditions of both inward folding and outward folding at the same time.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a display device. Background Art

[0002] With the development of technology, foldable flexible display devices have come into the view of ordinary consumers. An outer fold means that the display side faces outward when the display device is in a folded state. The outer fold can provide more convenient services for users. However, the display side being on the outside poses high requirements for the scratch resistance and impact resistance of the flexible module. An inner fold means that the main display panel is on the inside when the display device is in a folded state, which can well avoid problems such as scratches on the flexible display module. However, it is necessary to add a secondary screen on the outside for quick use.

[0003] Currently, foldable flexible display devices can only achieve outer folds or inner folds, and there is no display device that can simultaneously meet inner folds and outer folds.

[0004] It should be noted that the information disclosed in the above background art is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a display device, thereby at least to a certain extent overcoming one or more problems caused by the limitations and defects of the related art.

[0006] According to one aspect of the present disclosure, there is provided a display device, including:

[0007] A first support member having a first surface and a second surface disposed opposite to each other;

[0008] A second support member having a gap provided therebetween and the first support member, the second support member having a third surface and a fourth surface disposed opposite to each other;

[0009] A flexible display module disposed on the first surface of the first support member and the third surface of the second support member;

[0010] Wherein, a region of the first surface close to the second support member is a first mating surface, a region of the third surface close to the first support member is a third mating surface, and the first mating surface and the third mating surface are symmetrically arranged; at least part of the distance between the first mating surface and the flexible display module increases as the distance from the second support member decreases, and at least part of the distance between the third mating surface and the flexible display module increases as the distance from the first support member decreases, so that when the display device is folded inward, at least part of the flexible display module contacts at least part of the first mating surface and at least part of the third mating surface to form a water droplet shape.

[0011] In an exemplary embodiment of the present disclosure, both the first mating surface and the third mating surface include:

[0012] An adhesive plane on which the flexible display module is adhered;

[0013] An inclined surface connected to the adhesive plane, with a smooth transition between the inclined surface and the adhesive plane;

[0014] A limiting plane connected to the inclined surface, with the limiting plane arranged parallel to the adhesive plane;

[0015] Wherein, the inclined surface inclines away from the flexible display module from the adhesive plane to the limiting plane, and the inclined surface and the limiting plane are transitioned through at least one arc surface protruding towards the flexible display module, and the tangent planes of the inclined surface and the arc surface are coplanar. When the display device is folded inward, the flexible display module contacts the arc surface and the limiting plane to form a water droplet shape.

[0016] In an exemplary embodiment of the present disclosure, the inclination angle of the inclined surface is greater than or equal to 10 degrees and less than or equal to 20 degrees, the width of the limiting plane is greater than or equal to 5 mm and less than or equal to 7 mm, and the sum of the widths of the limiting plane and the inclined surface is greater than or equal to 13 mm and less than or equal to 15 mm.

[0017] In an exemplary embodiment of the present disclosure, the flexible display module includes:

[0018] A flexible support plate adhered to a part of the first surface and a part of the third surface;

[0019] A protective layer provided on the side of the flexible support plate away from the first support and the second support;

[0020] A negative film layer provided on the side of the protective layer away from the flexible support plate;

[0021] A first adhesive layer provided on the side of the negative film layer away from the flexible support plate;

[0022] A flexible display panel provided on the side of the first adhesive layer away from the flexible support plate;

[0023] A second adhesive layer provided on the side of the flexible display panel away from the flexible support plate;

[0024] A polarizer provided on the side of the second adhesive layer away from the flexible support plate;

[0025] A third adhesive layer provided on the side of the polarizer away from the flexible support plate;

[0026] The first cover plate is disposed on a side of the third adhesive layer away from the flexible support plate.

[0027] In an exemplary embodiment of the present disclosure, the thickness of the flexible support plate is greater than or equal to 140 μm and less than or equal to 160 μm, and the equivalent elastic modulus is greater than or equal to 8 Kpa and less than or equal to 12 Kpa.

[0028] In an exemplary embodiment of the present disclosure, the material of the first adhesive layer is OCA optical adhesive, the thickness is greater than or equal to 12 μm and less than or equal to 18 μm, and at a temperature of 25 °C, its elastic modulus is greater than or equal to 35 KPa and less than or equal to 55 Kpa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 120 KPa and less than or equal to 140 Kpa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 35 KPa and less than or equal to 45 KPa.

[0029] In an exemplary embodiment of the present disclosure, the material of the second adhesive layer is OCA optical adhesive, the thickness is greater than or equal to 10 μm and less than or equal to 20 μm, and at a temperature of 25 °C, its elastic modulus is greater than or equal to 70 KPa and less than or equal to 90 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 120 KPa and less than or equal to 140 Kpa; at a temperature of 65 °C, its elastic modulus is greater than or equal to 60 KPa and less than or equal to 80 KPa.

[0030] In an exemplary embodiment of the present disclosure, the thickness of the first cover plate is greater than or equal to 80 μm and less than or equal to 90 μm.

[0031] In an exemplary embodiment of the present disclosure, the thickness of the polarizer is greater than or equal to 40 μm and less than or equal to 50 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 GPa.

[0032] In an exemplary embodiment of the present disclosure, the thickness of the negative film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 Gpa.

[0033] In an exemplary embodiment of the present disclosure, the material of the third adhesive layer is OCA optical adhesive, the curing rate is greater than or equal to 65% and less than or equal to 71%, the thickness is greater than or equal to 45 μm and less than or equal to 55 μm, and at a temperature of 25 °C, its elastic modulus is greater than or equal to 45 KPa and less than or equal to 65 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 Kpa; or

[0034] The material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 90 μm and less than or equal to 110 μm, and an elastic modulus greater than or equal to 45 KPa and less than or equal to 65 KPa at a temperature of 25°C; at a temperature of -20°C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60°C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 KPa; or

[0035] The material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 45 μm and less than or equal to 55 μm, and an elastic modulus less than or equal to 130 KPa and less than or equal to 150 KPa at a temperature of 25°C.

[0036] In an exemplary embodiment of the present disclosure, the thickness of the bottom film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and the elastic modulus is greater than or equal to 8 GPa and less than or equal to 10 Gpa; and the material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 45 μm and less than or equal to 55 μm, and an elastic modulus greater than or equal to 45 KPa and less than or equal to 65 KPa at a temperature of 25°C; at a temperature of -20°C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60°C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 Kpa.

[0037] In an exemplary embodiment of the present disclosure, the thickness of the polarizer is greater than or equal to 80 μm and less than or equal to 100 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 Gpa; and the thickness of the bottom film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 Gpa; and the material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 45 μm and less than or equal to 55 μm, and an elastic modulus greater than or equal to 45 KPa and less than or equal to 65 KPa at a temperature of 25°C; at a temperature of -20°C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60°C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 Kpa.

[0038] In an exemplary embodiment of the present disclosure, the flexible display module further includes:

[0039] A fourth adhesive layer disposed on a side of the first cover plate away from the flexible support plate;

[0040] The second cover plate is disposed on a side of the fourth adhesive layer away from the flexible support plate.

[0041] In an exemplary embodiment of the present disclosure, the thickness of the second cover plate is greater than or equal to 80 μm and less than or equal to 90 μm.

[0042] Other features and advantages of the present disclosure will become apparent from the following detailed description, or will be learned in part from the practice of the present disclosure.

[0043] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present invention will become more apparent.

[0045] Figure 1 It is a schematic structural diagram of an exemplary embodiment of a display device of the present invention;

[0046] Figure 2 is Figure 1 a schematic structural diagram of the display device in the inner folding state in;

[0047] Figure 3 is Figure 1 a schematic structural diagram of the display device in the outer folding state in;

[0048] Figure 4 is Figure 1 a schematic overall structural diagram of the first support member and the second support member after connection in;

[0049] Figure 5 is Figure 4 a schematic structural diagram of the connection part of the first support member and the second support member after connection in;

[0050] Figure 6 is Figure 1 a schematic structural diagram of an exemplary embodiment of a flexible display module in;

[0051] Figure 7 is Figure 6 a schematic diagram of the strain finite element simulation of the second adhesive layer and the third adhesive layer in;

[0052] Figure 8 is Figure 6 a schematic diagram of the strain finite element simulation of the flexible display panel in;

[0053] Figure 9 is Figure 1 a schematic structural diagram of another exemplary embodiment of the flexible display module in.

[0054] The descriptions of the main component reference numerals in the figures are as follows:

[0055] 1. First support member; 11. First surface; 111. First mating surface; 12. Second surface; 13. First gear;

[0056] 2. Second support member; 21. Third surface; 211. Third mating surface; 22. Fourth surface; 23. Second gear;

[0057] a. Bonding plane; b. Inclined surface; c. Arc surface (circular arc surface); d. Limiting plane;

[0058] 3. Flexible display module; 31. Flexible support plate; 32. Protective layer; 33. Negative film layer; 34. First adhesive layer; 35. Flexible display panel; 36. Second adhesive layer; 37. Polarizer; 38. Third adhesive layer; 39. First cover plate; 40. Fourth adhesive layer; 41. Second cover plate;

[0059] 5. Bonding layer;

[0060] 61. First frame; 62. Second frame;

[0061] 7. Connecting portion; 71. Mating gear;

[0062] 8. Gap. Detailed implementation manners

[0063] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0064] When the foldable flexible display device is in the inner-folded and outer-folded states, the forces on each film layer are different. For example, the film layer that is under pressure during inner folding may be under tension during outer folding, and the film layer that is under tension during inner folding may be under pressure during outer folding; if the foldable flexible display device can satisfy both inner folding and outer folding simultaneously, the strain of each film layer is relatively large. Especially when in the inner-folded state, the maximum strain of each film layer generally occurs in the inner-folded state, which easily causes the adhesive material to fail, and the functional layer of the flexible display panel also fails due to the relatively large strain, resulting in the foldable flexible display device being unable to display normally.

[0065] Moreover, in the related art, the water droplet shape formed during the inner folding of the foldable flexible display device is not smooth, and there will be a fold angle, which also causes the strain of each film layer to be relatively large, easily causing the adhesive material to fail, and the functional layer of the flexible display panel 35 also fails due to the relatively large strain, resulting in the foldable flexible display device being unable to display normally.

[0066] This exemplary embodiment provides a display device. Referring to Figures 1 - 3 the schematic structural diagram of an exemplary embodiment of the display device of the present invention shown in the figure, the display device may include a first support member 1, a second support member 2, and a flexible display module 3; the first support member 1 has a first surface 11 and a second surface 12 disposed opposite to each other; a gap 8 is provided between the second support member 2 and the first support member 1, and the second support member 2 has a third surface 21 and a fourth surface 22 disposed opposite to each other; the flexible display module 3 is disposed on the first surface 11 of the first support member 1 and the third surface 21 of the second support member 2; wherein, the region of the first surface 11 close to the second support member 2 is a first mating surface 111, the region of the third surface 21 close to the first support member 1 is a third mating surface 211, the first mating surface 111 and the third mating surface 211 are symmetrically arranged, and the distance between at least a part of the first mating surface 111 and the flexible display module 3 increases as the distance from the second support member 2 decreases, and the distance between at least a part of the third mating surface 211 and the flexible display module 3 increases as the distance from the first support member 1 decreases. When the display device is folded inward, at least a part of the flexible display module 3 contacts at least a part of the first mating surface 111 and at least a part of the third mating surface 211 to form a water droplet shape.

[0067] In the display device of this exemplary embodiment, the distance between at least a part of the first mating surface 111 and the flexible display module 3 increases as the distance from the second support member 2 decreases, and the first mating surface 111 and the third mating surface 211 are symmetrically arranged, that is, the distance between at least a part of the third mating surface 211 and the flexible display module 3 increases as the distance from the first support member 1 decreases. When the display device is folded inward, at least a part of the flexible display module 3 contacts at least a part of the first mating surface 111 and at least a part of the third mating surface 211 to form a water droplet shape. Since the flexible display module 3 is supported by the first mating surface 111 and the third mating surface 211, the formed water droplet shape is relatively smooth and no folding angle is formed, avoiding large stress on each film layer, thereby avoiding the failure of the adhesive material and the functional layer, so as to be applicable to a display device that simultaneously meets the conditions of inward folding and outward folding.

[0068] In this exemplary embodiment, the so-called "far from" and "close to" refer to when the display device is in a flattened state. The length direction is the direction perpendicular to the folding direction of the display device, and the width direction is the direction perpendicular to the length direction and parallel to the flexible display module 3.

[0069] In the present exemplary embodiment, the first support member 1 has a first surface 11 and a second surface 12, and the first surface 11 and the second surface 12 are disposed opposite to each other. The second surface 12 may be set as a flat surface, and a flexible display module 3 may be disposed on the first surface 11. The second support member 2 has a third surface 21 and a fourth surface 22, and the third surface 21 and the fourth surface 22 are disposed opposite to each other. The fourth surface 22 may be set as a flat surface, and a flexible display module 3 may be disposed on the third surface 21.

[0070] The structures of the first support member 1 and the second support member 2 may be exactly the same; a gap 8 is provided between the second support member 2 and the first support member 1, and the first support member 1 and the second support member 2 are symmetrically disposed, that is, the first surface 11 and the third surface 21 are symmetric.

[0071] Specifically, the region of the first surface 11 close to the second support member 2 is a first mating surface 111, and the first mating surface 111 may include an adhesive flat surface a, an inclined surface b, and a limiting flat surface d. The adhesive flat surface a is located at one end of the first mating surface 111 away from the bending portion, and the limiting flat surface d is located at one end of the first support member 1 close to the bending portion. The limiting flat surface d and the adhesive flat surface a are parallel to each other and are both parallel to the flexible display module 3; the flexible display module 3 is bonded to the adhesive flat surface a through an adhesive layer 5; in the flattened state, there is a spaced space between the limiting flat surface d and the flexible display module 3.

[0072] The region of the third surface 21 close to the first support member 1 is a third mating surface 211, and the third mating surface 211 may also include an adhesive flat surface a, an inclined surface b, and a limiting flat surface d. The adhesive flat surface a is located at one end of the third mating surface 211 away from the bending portion, and the limiting flat surface d is located at one end of the second support member 2 close to the bending portion. The limiting flat surface d and the adhesive flat surface a are parallel to each other and are both parallel to the flexible display module 3; the flexible display module 3 is bonded to the adhesive flat surface a through an adhesive layer 5; in the flattened state, there is a spaced space between the limiting flat surface d and the flexible display module 3.

[0073] The inclined surface b is connected between the adhesive flat surface a and the limiting flat surface d. The inclined surface b is smoothly transitioned with the adhesive flat surface a, and the inclined surface b is inclined away from the flexible display module 3 from the adhesive flat surface a to the limiting flat surface d. The inclination angle α of the inclined surface b is approximately 15 degrees, that is, the angle α between the inclined surface b and the second surface 12 is approximately 15 degrees, and the angle α between the inclined surface b and the fourth surface 22 is also approximately 15 degrees. Of course, the inclination angle α of the inclined surface b being greater than or equal to 10 degrees and less than or equal to 20 degrees is acceptable.

[0074] The inclined surface b and the limiting plane d are transitioned through an arc surface c protruding towards the flexible display module 3. The tangent plane of the inclined surface b and the arc surface c is coplanar, that is, an arc surface c is connected between the inclined surface b and the limiting plane d. The arc surface c protrudes towards the flexible display module 3, and the arc surface c is tangent to the inclined surface b, so that the arc surface c and the inclined surface b are smoothly transitioned. That is, the first support 1 at the arc surface c forms a partial cylinder, and the tangent plane of the cylinder is a plane passing through a generatrix of the cylinder and perpendicular to the axial section passing through this generatrix. In addition, in other exemplary embodiments of the present invention, the arc surface c connected between the inclined surface b and the limiting plane d may also be an elliptical arc surface c, a parabolic arc surface c, etc., as long as it can contact the flexible display module 3 when the display device is folded inward to make the flexible display module 3 form a relatively smooth water droplet shape.

[0075] In this exemplary embodiment, referring to Figure 2 as shown, the width L1 of the limiting plane d is approximately 6 mm ± 1 mm. It should be noted that the width L1 of the limiting plane d being approximately 6 mm ± 1 mm means that the width L1 of the limiting plane d is greater than or equal to 5 mm (6 mm - 1 mm) and less than or equal to 7 mm (6 mm + 1 mm). Each data mentioned subsequently represents an interval value, not a point value; it corresponds to the numerical range in the claims. The sum L2 of the widths of the inclined surface b and the limiting plane d is approximately 14 mm ± 1 mm. After the display device is folded inward, the minimum distance H1 between the first support 1 and the second support 2 is approximately 2 mm, achieving a smooth water droplet shape when folded inward, and the radius R1 is approximately 3 mm; referring to Figure 3 as shown, after the display device is folded outward, the maximum distance H2 between the first support 1 and the second support 2 is approximately 10 mm, achieving a smooth "U" shape when folded outward, and the radius R2 is approximately 5 mm. Of course, the width of the limiting plane d and the width of the inclined surface b can also be set as needed.

[0076] In this exemplary embodiment, the bonding plane a extends towards the side away from the bending portion to support the flexible display module 3. Since the structures of the first support 1 and the second support 2 can be exactly the same, the extension length of the bonding plane a of the first support 1 is the same as the extension length of the bonding plane a of the second support 2.

[0077] Of course, in other exemplary embodiments of the present invention, the first mating surface 111 and the third mating surface 211 can be formed into a shape that completely fits the smooth water droplet shape to be formed, so that when the display device is folded inward, the flexible display module 3 is completely attached to the first mating surface 111 and the third mating surface 211 to support the flexible display module 3. The structures of the first support member 1 and the second support member 2 may also be different. For example, the widths of the first support member 1 and the second support member 2 may be inconsistent, that is, the extension lengths of the bonding planes a of the first support member 1 and the second support member 2 are different, so that the bending position of the display device is not located in the middle position; as long as the first mating surface 111 and the third mating surface 211 are symmetrically arranged, a smooth and symmetrical water droplet shape can be formed, avoiding display failure caused by uneven stress on the flexible display module 3 and each functional layer during inward folding.

[0078] Referring Figure 4 and Figure 5 As shown, a first frame 61 is further provided on the outer periphery of the first support member 1. The first frame 61 surrounds the other three edges of the first support member 1 except the first mating surface 111, and both ends of the first frame 61 protrude beyond the first mating surface 111. Two first fixed shafts are correspondingly arranged at the two ends of the first frame 61 that protrude beyond the first mating surface 111, and a first gear 13 is arranged on the first fixed shaft.

[0079] A second frame 62 is further provided on the outer periphery of the second support member 2. The second frame 62 surrounds the other three edges of the second support member 2 except the third mating surface 211, and both ends of the second frame 62 protrude beyond the third mating surface 211. Two second fixed shafts are correspondingly arranged at the two ends of the second frame 62 that protrude beyond the third mating surface 211, and a second gear 23 is arranged on the second fixed shaft.

[0080] Referring Figure 4 and Figure 5 As shown, the display device further includes two connecting portions 7. The structures of the two connecting portions 7 are the same. The connecting portion 7 includes at least one mating gear 71. The mating gear 71 is disposed between the first gear 13 and the second gear 23 and is externally meshed with the first gear 13 and the second gear 23, so that both the first support member 1 and the second support member 2 can rotate relative to the connecting portion 7 to achieve inward or outward folding of the display device.

[0081] The specific structure of the flexible display module 3 will be described in detail below.

[0082] Referring Figure 6Schematic structural diagram of an exemplary embodiment of the flexible display module 3. The flexible display module 3 may include: a flexible support plate 31, a protective layer 32, a base film layer 33, a first adhesive layer 34, a flexible display panel 35, a second adhesive layer 36, a polarizer 37, a third adhesive layer 38, a first cover plate 39, a fourth adhesive layer 40, and a second cover plate 41. The flexible support plate 31 is bonded to a part of the first surface 11 and a part of the third surface 21. The protective layer 32 is disposed on a side of the flexible support plate 31 away from the first support member 1 and the second support member 2; the base film layer 33 is disposed on a side of the protective layer 32 away from the flexible support plate 31; the first adhesive layer 34 is disposed on a side of the base film layer 33 away from the flexible support plate 31; the flexible display panel 35 is disposed on a side of the first adhesive layer 34 away from the flexible support plate 31; the second adhesive layer 36 is disposed on a side of the flexible display panel 35 away from the flexible support plate 31; the polarizer 37 is disposed on a side of the second adhesive layer 36 away from the flexible support plate 31; the third adhesive layer 38 is disposed on a side of the polarizer 37 away from the flexible support plate 31; the first cover plate 39 is disposed on a side of the third adhesive layer 38 away from the flexible support plate 31; the fourth adhesive layer 40 is disposed on a side of the first cover plate 39 away from the flexible support plate 31; the second cover plate 41 is disposed on a side of the fourth adhesive layer 40 away from the flexible support plate 31.

[0083] The positional relationship of each film layer of the flexible display module 3 has been described above. Next, the thickness and performance requirements of each film layer will be described.

[0084] The flexible support plate 31 may be a metal support plate. The thickness of the flexible support plate 31 may be 150μm ± 10μm, and the equivalent elastic modulus is 10Kpa ± 2Kpa. The flexible support plate 31 provides a supporting force for the entire flexible display module 3.

[0085] The material of the protective layer 32 may be foam. The protective layer 32 can protect the base film layer 33 and prevent the flexible support plate 31 from damaging the base film layer 33. There are adhesive layers on both sides of the protective layer 32 for bonding the flexible support plate 31 and the base film layer 33.

[0086] The material of the base film layer 33 may be polyimide. The thickness of the base film layer 33 may be 23μm ± 3μm, and the elastic modulus may be 3.2GPa ± 0.5Gpa. The function of the base film layer 33 is to support and protect the flexible display panel 35.

[0087] The material of the first adhesive layer 34 can be OCA (Optically Clear Adhesive) optical adhesive, and the thickness of the first adhesive layer 34 can be 15μm ± 3μm. At a temperature of 25°C, its elastic modulus is 45KPa ± 10Kpa; at a temperature of -20°C, its elastic modulus is 130KPa ± 10Kpa; at a temperature of 60°C, its elastic modulus is 40KPa ± 5KPa. The first adhesive layer 34 is used to bond the flexible display panel 35 and the negative film layer 33.

[0088] OCA optical adhesive is a special adhesive used for bonding transparent optical components (such as lenses, etc.). It is required to be colorless and transparent, with a light transmittance of more than 90%, good bonding strength, curable at room temperature or medium temperature, and have characteristics such as small curing shrinkage; OCA optical adhesive is a special substrate-free double-sided adhesive with optical transparency.

[0089] The flexible display panel 35 can be an OLED (Organic Electroluminesence Display) display panel or a QLED (Quantum Dots Light Emitting Diode Display) display panel, etc. The flexible display panel 35 can be any display panel that can be made flexible, and the specific structure of the display panel will not be elaborated here.

[0090] The material of the second adhesive layer 36 can also be OCA optical adhesive, and the thickness of the second adhesive layer 36 can be 15μm ± 5μm. At a temperature of 25°C, its elastic modulus is 80KPa ± 10KPa; at a temperature of -20°C, its elastic modulus is 130KPa ± 10Kpa; at a temperature of 65°C, its elastic modulus is 70KPa ± 10KPa. The second adhesive layer 36 is used to bond the flexible display panel 35 and the polarizer 37.

[0091] The thickness of the polarizer 37 can be 45μm ± 5μm, and its elastic modulus is 3.2GPa ± 0.5GPa. The basic structure of the polarizer 37 includes: PVA (polyvinyl alcohol) in the middle, two layers of TAC (triacetyl cellulose), PSA film (pressure-sensitive adhesive), Release film (release film), and Protective film (protective film). Among them, the PVA layer plays a polarization role, but PVA is extremely easy to hydrolyze. In order to protect the physical properties of the polarizing film, a layer of (TAC) film with high light transmittance, good water resistance, and certain mechanical strength is laminated on both sides of the PVA for protection, which forms the original polarizer 37.

[0092] The material of the third adhesive layer 38 can also be OCA optical adhesive. The thickness of the third adhesive layer 38 can be 50μm ± 5μm. At a temperature of 25°C, its elastic modulus is 55KPa ± 10KPa; at a temperature of -20°C, its elastic modulus is 120KPa ± 10Kpa; at a temperature of 60°C, its elastic modulus is 35KPa ± 5KPa. The curing rate of the third adhesive layer 38 is 68% ± 3%. The third adhesive layer 38 is used to bond the polarizer 37 and the first cover plate 39.

[0093] The thicknesses of the first cover plate 39 and the second cover plate 41 can both be 85μm ± 5μm. The materials of the first cover plate 39 and the second cover plate 41 can be polyimide or a combination of polyimide and PET (Polyethylene terephthalate). The fourth adhesive layer 40 is used to bond the first cover plate 39 and the second cover plate 41. Providing two cover plates (the first cover plate 39 and the second cover plate 41) can enhance the scratch resistance and impact resistance of the display device, and avoid damage to each functional layer caused by scratching and impact when the display device is folded outward.

[0094] In the second exemplary embodiment of the present invention, on the basis of keeping other conditions unchanged, the thickness of the third adhesive layer 38 can be adjusted. Specifically: The material of the third adhesive layer 38 can also be OCA optical adhesive. The thickness of the second adhesive layer 36 can be 100μm ± 10μm. At a temperature of 25°C, its elastic modulus is 55KPa ± 10KPa; at a temperature of -20°C, its elastic modulus is 120KPa ± 10Kpa; at a temperature of 60°C, its elastic modulus is 35KPa ± 5KPa. The curing rate of the third adhesive layer 38 is 68% ± 3%.

[0095] In the third exemplary embodiment of the present invention, on the basis of keeping other conditions unchanged, the elastic modulus of the third adhesive layer 38 can be adjusted. Specifically: The material of the third adhesive layer 38 can also be OCA optical adhesive. The thickness of the second adhesive layer 36 can be 50μm ± 5μm. At a temperature of 25°C, its elastic modulus is 140KPa ± 10KPa. The curing rate of the third adhesive layer 38 is 68% ± 3%.

[0096] In the fourth exemplary embodiment of the present invention, on the basis of keeping other conditions unchanged, the thickness of the polarizer 37 can be adjusted. Specifically: The thickness of the polarizer 37 can be 90μm ± 10μm, and its elastic modulus is 3.2GPa ± 0.5GPa.

[0097] In the fifth exemplary embodiment of the present invention, on the basis of keeping other conditions unchanged, the elastic modulus of the bottom film layer 33 can be adjusted. Specifically: the material of the bottom film layer 33 can be polyimide, the thickness of the bottom film layer 33 can be 23μm ± 3μm, and the elastic modulus is 9GPa ± 1Gpa.

[0098] In the above exemplary embodiments, each film layer is mutually matched and obtained through countless tests.

[0099] Refer to Figure 7 the schematic diagram of the strain finite element simulation of the second adhesive layer 36 and the third adhesive layer 38 shown. The ordinate in the figure is the strain; refer to Figure 8 the schematic diagram of the strain finite element simulation of the flexible display panel 35 shown. The ordinate in the figure is the strain. The strains in the figure are all the maximum strains during the process of the display device changing from the inner-fold state to the outer-fold state. The comparison of the following data is to compare each exemplary embodiment with the first exemplary embodiment.

[0100] It can be obtained from the figure that: in the first exemplary embodiment, the strain of the second adhesive layer 36 is approximately 124%, the strain of the third adhesive layer 38 is approximately 136%, and the strain of the flexible display panel 35 is approximately 0.225%; the strains of the flexible display panel 35, the second adhesive layer 36, and the third adhesive layer 38 are all relatively small. In the second exemplary embodiment, the strain of the second adhesive layer 36 slightly decreases to approximately 122%; however, the strain of the third adhesive layer 38 increases significantly to approximately 180%; the strain of the flexible display panel 35 slightly increases to approximately 0.23%. In the third exemplary embodiment, the strain of the second adhesive layer 36 increases significantly to approximately 162%; the strain of the third adhesive layer 38 increases significantly to approximately 160%; the strain of the flexible display panel 35 also increases significantly to approximately 0.42%. In the fourth exemplary embodiment, the strain of the second adhesive layer 36 slightly increases to approximately 148%; the strain of the third adhesive layer 38 slightly increases to approximately 142%; the strain of the flexible display panel 35 slightly decreases to approximately 0.21%. In the fifth exemplary embodiment, the strain of the second adhesive layer 36 basically remains unchanged; the strain of the third adhesive layer 38 slightly decreases to approximately 134%; the strain of the flexible display panel 35 increases significantly to approximately 0.46%.

[0101] Therefore, from the above comparison, it can be obtained that the first exemplary embodiment is relatively better, the second and fourth exemplary embodiments are second, and the third and fifth exemplary embodiments are the worst. However, the strains of each film layer in the above five exemplary embodiments are all smaller than the strains of the corresponding film layers in the prior art. Through tests, it is obtained that the strains of the second adhesive layer 36 and the third adhesive layer 38 in the prior art are both greater than 200%, and the strains of the flexible display panel are both greater than 0.5%.

[0102] Referring to Figure 9 As shown, in another exemplary embodiment of the present invention, the fourth adhesive layer 40 and the second cover plate 41 may not be provided.

[0103] The features, structures, or characteristics described above can be combined in one or more embodiments in any suitable manner. If possible, the features discussed in each embodiment are interchangeable. In the above description, many specific details are provided to give a full understanding of the embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, materials, etc. can be adopted. In other cases, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0104] As used in this specification, the terms "about" and "approximately" generally mean within 20% of a given value or range, preferably within 10%, and more preferably within 5%. The given quantity is an approximate quantity, meaning that the implications of "about", "approximately", "substantially", or "roughly" can still be implied without specific instructions.

[0105] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience, for example, according to the directions of the examples described in the drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component "lower". Other relative terms such as "high", "low", "top", "bottom", etc. also have similar meanings. When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" provided on another structure, or that a structure is "indirectly" provided on another structure through another structure.

[0106] In this specification, the terms "a", "an", "the", "said", and "at least one" are used to indicate the existence of one or more elements / components / etc.; the terms "comprising", "including", and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.; the terms "first", "second", and "third", etc. are used only as labels and are not a limitation on the quantity of their objects.

[0107] It should be understood that the present invention is not limited in its application to the detailed construction and arrangement of components set forth in this specification. The present invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It should be understood that the invention as disclosed and defined in this specification extends to all alternative combinations of two or more separate features mentioned or evident in the text and / or drawings. All such different combinations constitute various alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for practicing the invention and will enable those skilled in the art to utilize the present invention.

Claims

1. A display device, wherein, Comprising: A first support member having a first surface and a second surface disposed opposite to each other; A second support member having a gap provided therebetween and the first support member, the second support member having a third surface and a fourth surface disposed opposite to each other; A flexible display module disposed on the first surface of the first support member and the third surface of the second support member; Wherein, a region of the first surface close to the second support member is a first mating surface, a region of the third surface close to the first support member is a third mating surface, and the first mating surface and the third mating surface are symmetrically disposed; the distance between at least a part of the first mating surface and the flexible display module increases as the distance from the second support member decreases, and the distance between at least a part of the third mating surface and the flexible display module increases as the distance from the first support member decreases, so that when the display device is folded inward, at least a part of the flexible display module contacts at least a part of the first mating surface and at least a part of the third mating surface to form a water droplet shape; The flexible display module includes: A flexible support plate bonded to a part of the first surface and a part of the third surface, the thickness of the flexible support plate being greater than or equal to 140 μm and less than or equal to 160 μm, and the equivalent elastic modulus being greater than or equal to 8 Kpa and less than or equal to 12 Kpa.

2. The display device according to claim 1, wherein, Both the first mating surface and the third mating surface include: A bonding plane on which the flexible display module is bonded; An inclined surface connected to the bonding plane, and the inclined surface and the bonding plane are smoothly transitioned; A limiting plane connected to the inclined surface, and the limiting plane is disposed parallel to the bonding plane; Wherein, the inclined surface inclines away from the flexible display module from the bonding plane to the limiting plane, and the inclined surface and the limiting plane are transitioned through at least one arc surface protruding toward the flexible display module, and the inclined surface and the tangent plane of the arc surface are coplanar, so that when the display device is folded inward, the flexible display module contacts the arc surface and the limiting plane to form a water droplet shape.

3. The display device according to claim 2, wherein, The inclination angle of the inclined surface is greater than or equal to 10 degrees and less than or equal to 20 degrees, the width of the limiting plane is greater than or equal to 5 mm and less than or equal to 7 mm, and the sum of the width of the limiting plane and the inclined surface is greater than or equal to 13 mm and less than or equal to 15 mm.

4. The display device according to claim 1, wherein, The flexible display module further includes: A protective layer disposed on a side of the flexible support plate away from the first support member and the second support; A bottom film layer disposed on a side of the protective layer away from the flexible support plate; A first adhesive layer disposed on a side of the bottom film layer away from the flexible support plate; A flexible display panel disposed on a side of the first adhesive layer away from the flexible support plate; A second adhesive layer disposed on a side of the flexible display panel away from the flexible support plate; A polarizer disposed on a side of the second adhesive layer away from the flexible support plate; A third adhesive layer disposed on a side of the polarizer away from the flexible support plate; A first cover plate disposed on a side of the third adhesive layer away from the flexible support plate.

5. The display device according to claim 4, wherein, The material of the first adhesive layer is OCA optical adhesive, with a thickness greater than or equal to 12 μm and less than or equal to 18 μm. At a temperature of 25 °C, its elastic modulus is greater than or equal to 35 KPa and less than or equal to 55 Kpa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 120 KPa and less than or equal to 140 Kpa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 35 KPa and less than or equal to 45 KPa.

6. The display device according to claim 5, wherein, The material of the second adhesive layer is OCA optical adhesive, with a thickness greater than or equal to 10 μm and less than or equal to 20 μm. At a temperature of 25 °C, its elastic modulus is greater than or equal to 70 KPa and less than or equal to 90 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 120 KPa and less than or equal to 140 Kpa; at a temperature of 65 °C, its elastic modulus is greater than or equal to 60 KPa and less than or equal to 80 KPa.

7. The display device according to claim 6, wherein, The thickness of the first cover plate is greater than or equal to 80 μm and less than or equal to 90 μm.

8. The display device according to claim 7, wherein, The thickness of the polarizer is greater than or equal to 40 μm and less than or equal to 50 μm, and its elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 GPa.

9. The display device according to claim 8, wherein, The thickness of the bottom film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and its elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 Gpa.

10. The display device according to claim 9, wherein, The material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 45 μm and less than or equal to 55 μm. At a temperature of 25 °C, its elastic modulus is greater than or equal to 45 KPa and less than or equal to 65 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 Kpa; or The material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 90 μm and less than or equal to 110 μm. At a temperature of 25 °C, its elastic modulus is greater than or equal to 45 KPa and less than or equal to 65 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 Kpa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 KPa; or The material of the third adhesive layer is OCA optical adhesive, with a curing rate greater than or equal to 65% and less than or equal to 71%, a thickness greater than or equal to 45 μm and less than or equal to 55 μm. At a temperature of 25 °C, its elastic modulus is less than or equal to 130 KPa and less than or equal to 150 KPa.

11. The display device according to claim 8, wherein,The thickness of the negative film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and the elastic modulus is greater than or equal to 8 GPa and less than or equal to 10 GPa; and the material of the third adhesive layer is OCA optical adhesive, the curing rate is greater than or equal to 65% and less than or equal to 71%, the thickness is greater than or equal to 45 μm and less than or equal to 55 μm, and at a temperature of 25 °C, its elastic modulus is greater than or equal to 45 KPa and less than or equal to 65 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 KPa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 KPa.

12. The display device according to claim 7, wherein, The thickness of the polarizer is greater than or equal to 80 μm and less than or equal to 100 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 GPa; and the thickness of the negative film layer is greater than or equal to 20 μm and less than or equal to 26 μm, and the elastic modulus is greater than or equal to 2.7 GPa and less than or equal to 3.7 GPa; and the material of the third adhesive layer is OCA optical adhesive, the curing rate is greater than or equal to 65% and less than or equal to 71%, the thickness is greater than or equal to 45 μm and less than or equal to 55 μm, and at a temperature of 25 °C, its elastic modulus is greater than or equal to 45 KPa and less than or equal to 65 KPa; at a temperature of -20 °C, its elastic modulus is greater than or equal to 110 KPa and less than or equal to 130 KPa; at a temperature of 60 °C, its elastic modulus is greater than or equal to 30 KPa and less than or equal to 40 KPa.

13. The display device according to any one of claims 4 to 12, wherein, The flexible display module further includes: A fourth adhesive layer provided on the side of the first cover plate away from the flexible support plate; A second cover plate provided on the side of the fourth adhesive layer away from the flexible support plate.

14. The display device according to claim 13, wherein, The thickness of the second cover plate is greater than or equal to 80 μm and less than or equal to 90 μm.

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