CN113470535A - Supporting structure for supporting flexible display screen and flexible display device - Google Patents
Supporting structure for supporting flexible display screen and flexible display device Download PDFInfo
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- CN113470535A CN113470535A CN202110829186.1A CN202110829186A CN113470535A CN 113470535 A CN113470535 A CN 113470535A CN 202110829186 A CN202110829186 A CN 202110829186A CN 113470535 A CN113470535 A CN 113470535A
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- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The embodiment of the invention provides a supporting structure for supporting a flexible display screen and a flexible display device, and relates to the technical field of display. The support structure comprises a flexible support layer, wherein the flexible support layer comprises a first support layer and a second support layer; the first support layer comprises a first surface and a second surface which are oppositely arranged, and the first surface is the surface facing the flexible display screen in the first support layer; the second support layer is positioned on one side of the second surface of the first support layer, the second support layer comprises a plurality of support parts arranged at intervals, the support parts comprise a first support part and a second support part, and the direction of the first support part pointing to the second support part is the curling direction of the flexible display screen; in the direction perpendicular to the plane where the first supporting layer is located, the film thickness of the first supporting part is larger than that of the second supporting part.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a supporting structure for supporting a flexible display screen and a flexible display device.
[ background of the invention ]
The flexible display technology is an important development direction of the current display technology, and the flexible display device has the characteristics of flexibility, ultra-light and thinness, low power consumption, portability and the like, and is widely applied to various electronic products.
The flexible display device comprises a flexible display screen and a supporting layer for supporting the flexible display screen, wherein for the flexible display device with a curling state, the flexible display device is usually wound for more than three turns, and after winding, stress distribution at different positions of the flexible display screen is uneven, so that the screen can be damaged due to stress concentration in partial areas.
[ summary of the invention ]
In view of this, the embodiment of the present invention provides a supporting structure for supporting a flexible display screen and a flexible display device, when the flexible display device is curled, the stress of the flexible display screen is uniformly distributed, and at the same time, the supporting layer is prevented from being broken, and the surface flatness of the flexible display screen is improved.
In one aspect, an embodiment of the present invention provides a support structure for supporting a flexible display screen, where the support structure includes a flexible support layer, and the flexible support layer includes a first support layer and a second support layer;
the first support layer comprises a first surface and a second surface which are oppositely arranged, and when the support structure is in an unfolded state, the first surface is the surface, facing the flexible display screen, of the first support layer;
the second support layer is positioned on one side of the second surface of the first support layer, the second support layer comprises a plurality of support parts arranged at intervals, the support parts comprise a first support part and a second support part, and the direction of the first support part pointing to the second support part is the curling direction of the flexible display screen; when the supporting structure is in an unfolded state, the film thickness of the first supporting part is larger than that of the second supporting part in the direction perpendicular to the plane where the first supporting layer is located.
Based on the same inventive concept, an embodiment of the present invention further provides a flexible display device, including:
the flexible display screen comprises a light emitting surface and a non-light emitting surface;
the supporting structure is located on the side of the non-light-emitting surface of the flexible display screen
The supporting structure for supporting the flexible display screen and the flexible display device provided by the embodiment of the invention have the following beneficial effects:
maximum bending stress generated at various positions of the flexible display device when the flexible display device is curled
Wherein, M is the cross section bending moment of the flexible display device at the corresponding position, W is the bending section coefficient of the flexible display device at the corresponding position, and the maximum bending stress is transmitted to the flexible supporting layer and the flexible display screen at the corresponding position and is shared by the flexible supporting layer and the flexible display screen.
In the embodiment of the invention, the flexible supporting layer adopts a double-layer structure design, wherein the second supporting layer is used as a reinforcing layer and comprises a plurality of supporting parts which are independently arranged, and the local rigidity of the flexible supporting layer at different positions can be changed by performing the design of film thickness differentiation on the supporting parts at different positions. Specifically, taking the cross-sectional shape of the support portion perpendicular to the extending direction thereof as a rectangle as an example, the bending resistance section coefficient corresponding to the support portion
Wherein, b is the width of the supporting part in the direction vertical to the extending direction of the supporting part, and h is the film thickness of the supporting part in the direction vertical to the plane of the first supporting layer. Because the membrane thickness h1 of first supporting part is greater than the membrane thickness h2 of second supporting part, therefore, the bending resistance section coefficient that first supporting part corresponds is bigger, and correspondingly, the rigidity of the local flexible supporting layer of first supporting part position department is also bigger, and bending resistance is higher. Furthermore, compared with the second supporting part, the first supporting part is closer to the inner ring position, so that the local rigidity of the flexible supporting layer at the position close to the inner ring is larger, the part of the flexible supporting layer can bear larger bending stress, the bending stress transmitted to the flexible display screen is reduced, the stress mutation of the flexible display screen at the inner ring position is reduced, the stress distribution uniformity of the flexible display screen is effectively improved, and the stress reductionAnd the flexible display screen is damaged due to stress concentration of the inner ring.
Meanwhile, in the embodiment of the invention, the first supporting layer is arranged between the second supporting layer and the flexible display screen at intervals, so that the rigidity of the whole flexible supporting layer can be maintained by utilizing the rigidity of the first supporting layer, and the risk of fracture of the flexible supporting layer caused by insufficient rigidity of partial area is avoided. In addition, first supporting layer can carry out the outrigger to each position of flexible display screen, no matter be flexible display device in expansion state or the state of curling, can both avoid the flexible display screen sunken in the clearance between the supporting part, has effectively improved the surface smoothness of flexible display screen.
Therefore, in the embodiment of the invention, by improving the structure of the flexible supporting layer, the stress distribution uniformity of the flexible display screen is improved, the damage of the inner ring screen of the flexible display screen is avoided, and simultaneously, the reliability of the flexible supporting layer and the surface smoothness of the flexible display screen are also improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an unfolded structure of a flexible display device in the prior art;
fig. 2 is a schematic diagram of a rolled structure of a flexible display device in the prior art;
fig. 3 is a schematic view of an expanded structure of a flexible display device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a support structure according to an embodiment of the present invention;
FIG. 5 is a schematic view of an unfolded structure of a flexible display supported by a support structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a rolled configuration of a support structure supporting a flexible display screen according to an embodiment of the present invention;
FIG. 7 is a top view of a flexible support layer provided by an embodiment of the present invention;
FIG. 8 is another top view of a flexible support layer provided by embodiments of the present invention;
FIG. 9 is a further top view of a flexible support layer provided by embodiments of the present invention;
FIG. 10 is a further top view of a flexible support layer provided by embodiments of the present invention;
FIG. 11 is a cross-sectional view taken along line A1-A2 of FIG. 7;
FIG. 12 is another cross-sectional view taken along line A1-A2 of FIG. 7;
FIG. 13 is a schematic view of another embodiment of a support structure according to the present invention;
FIG. 14 is a schematic view of another rolled configuration of a support structure supporting a flexible display screen according to an embodiment of the present invention;
FIG. 15 is a schematic view of a support structure supporting a flexible display screen according to an embodiment of the present invention in an unfolded configuration;
FIG. 16 is a schematic structural diagram of a reel according to an embodiment of the present invention;
fig. 17 is a schematic structural diagram of a glue layer provided in the embodiment of the present invention;
fig. 18 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first and second may be used to describe the support layers in embodiments of the present invention, the support layers should not be limited to these terms. These terms are only used to distinguish the support layers from each other. For example, the first support layer may also be referred to as a second support layer, and similarly, the second support layer may also be referred to as a first support layer, without departing from the scope of embodiments of the present invention.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic diagram of an unfolded structure of a flexible display device in the prior art, and fig. 2 is a schematic diagram of a rolled structure of a flexible display device in the prior art, the flexible display device includes a flexible display screen 101 and a support layer 102, the support layer 102 is used for supporting the flexible display screen 101, and the support layer 102 is a film layer with a uniform film thickness.
The inventors have found that the bending stress generated at different positions when the flexible display device is wound for a plurality of turns is different. Specifically, the bending stress σ generated at each position of the flexible display device is E × ═ E, where E is the equivalent elastic modulus of the flexible display device and ∈ is strain. Further, according to ε ═
The derivation shows: σ ═ E × y × K, where y is the distance between the flexible display screen 101 and the neutral plane of the support layer 102,
k is the curvature. As can be seen, the bending stress σ and the curvatureK is in a direct proportion relation, and the larger the curvature K is, the larger the bending stress sigma is.
It can be understood that after the flexible display device is wound for multiple turns, the closer to the inner circle position, the more the flexible display device is bent, and the corresponding curvature is larger, so that the flexible display device generates a larger bending stress at the inner circle position, which leads to a problem that the flexible display screen 101 is easily damaged by local stress concentration at the inner circle position.
In order to solve the above problems, an embodiment of the present invention provides an improved scheme, in which a structure of a supporting layer is improved to adjust a local stiffness of the supporting layer, so as to adjust a bending stress locally transmitted to a flexible display screen.
As shown in fig. 3, fig. 3 is a schematic view of an unfolded structure of the flexible display device according to the embodiment of the present invention, a plurality of grooves 2 'are formed on a support layer 1', and the volume of the grooves 2 'increases along a rolling direction of a flexible display screen 3', for example, the depth of the grooves 2 'increases along the rolling direction of the flexible display screen 3'. By such arrangement, after the flexible display device is wound for multiple circles, the volume of the groove 2' is smaller at the position closer to the inner circle, the modulus of the material of the supporting layer 1' is larger, correspondingly, the rigidity of the supporting layer 1' at the position is larger, the bending resistance is higher, and larger bending stress can be borne, so that the bending stress transmitted to the flexible display screen 3' is reduced, and the stress concentration of the flexible display screen 3' at the position of the inner circle is avoided.
However, the inventor further studies and finds that, after the groove 2 'is formed in the support layer 1', the rigidity of the body of the support layer 1 'cannot be ensured at a position where the volume of the groove 2' is large, and the support layer 1 'is easily broken when the flexible display device is curled, thereby reducing the reliability of the support layer 1'. Moreover, when the flexible display screen 3' is curled, the flexible display screen is easy to be sunken in the groove 2', so that the surface flatness of the flexible display screen 3' is low, and the curling effect is influenced.
Therefore, the inventor provides a further improvement scheme, and by adopting the technical scheme, when the flexible display device is curled, the stress distribution of the flexible display screen is adjusted by using the supporting layer, so that the supporting layer is prevented from being broken, the reliability of the supporting layer is improved, the flexible display screen is prevented from being sunken in the groove, and the surface flatness of the flexible display screen is improved.
An embodiment of the present invention provides a support structure for supporting a flexible display screen, as shown in fig. 4, fig. 4 is a schematic structural diagram of the support structure provided in the embodiment of the present invention, where the support structure includes a flexible support layer 1, the flexible support layer 1 includes a first support layer 2 and a second support layer 3, and the first support layer 2 and the second support layer 3 may be configured to be curled and deformed, and may be specifically formed by a Polycarbonate (PC) material.
Referring to fig. 5, fig. 5 is a schematic view of an unfolded structure of the support structure supporting the flexible display screen according to the embodiment of the present invention, in which the first support layer 2 includes a first surface 4 and a second surface 5, which are oppositely disposed, and when the support structure is in an unfolded state, the first surface 4 is a surface of the first support layer 2 facing the flexible display screen 100. For example, when the support structure is in contact with the flexible display screen 100, the flexible display screen 100 conforms to the first surface 4 of the first support layer 2.
The second support layer 3 is located on one side of the second surface 5 of the first support layer 2, the second support layer 3 includes a plurality of support portions 6 arranged at intervals, the support portions 6 include a first support portion 7 and a second support portion 8, and a direction in which the first support portion 7 points to the second support portion 8 is a curling direction X of the flexible display screen 100. When the support structure is in the unfolded state, the film thickness d1 of the first support part 7 is larger than the film thickness d2 of the second support part 8 in the direction perpendicular to the plane of the first support layer 2. That is, when the flexible display device is curled, the first support part 7 having a larger film thickness is closer to the inner ring position than the second support part 8.
It should be noted that, when the flexible display device is rolled, the flexible display panel 100 is bent along a side facing the second support layer 3, and at this time, the light emitting surface of the flexible display panel 100 at the outermost circle is exposed to the outside.
Maximum bending stress generated at various positions of the flexible display device when the flexible display device is curled
Wherein M is a cross-sectional bending moment of the flexible display device at the corresponding position, W is a bending section coefficient of the flexible display device at the corresponding position, and the maximum bending stress is transmitted to the flexible support layer 1 and the flexible display screen 100 at the corresponding position and is shared by the flexible support layer 1 and the flexible display screen 100.
In the embodiment of the present invention, the flexible supporting layer 1 adopts a double-layer structure design, wherein the second supporting layer 3 serves as a reinforcing layer, the second supporting layer 3 includes a plurality of supporting portions 6 which are independently arranged, and the local stiffness of the flexible supporting layer 1 at different positions can be changed by performing a film thickness differentiation design on the supporting portions 6 at different positions. Specifically, referring to fig. 5, the cross-sectional shape of the support portion 6 in the direction perpendicular to the extending direction thereof is a rectangle, and the bending resistance cross-sectional coefficient of the support portion 6 corresponds to
Where b is the width of the support portion 6 in the direction perpendicular to the extending direction thereof, and h is the film thickness of the support portion 6 in the direction perpendicular to the plane of the first support layer 2. Since the film thickness h1 of the first support part 7 is larger than the film thickness h2 of the second support part 8, the bending section modulus of the first support part 7 is larger, and accordingly, the rigidity of the local flexible support layer 1 at the position of the first support part 7 is larger, and the bending resistance is higher. Further, compared with the second support part 8, the first support part 7 is closer to the inner ring position, so that the local rigidity of the flexible support layer 1 at the position close to the inner ring position is larger, and the part of the flexible support layer 1 can bear larger bending stress, so that the bending stress transmitted to the flexible display screen 100 is reduced, the stress mutation of the flexible display screen 100 at the inner ring position is reduced, the stress distribution uniformity of the flexible display screen 100 is effectively improved, and the risk that the screen of the flexible display screen 100 is damaged due to the stress concentration of the inner ring is reduced.
Meanwhile, compared with the structure shown in fig. 3, in the embodiment of the present invention, the first support layer 2 is further spaced between the second support layer 3 and the flexible display screen 100, so that the stiffness of the first support layer 2 can be utilized to maintain the overall stiffness of the flexible support layer 1, and the risk of fracture of the flexible support layer 1 due to insufficient stiffness of a partial region is avoided. In addition, first supporting layer 2 can carry out the stable support to each position of flexible display screen 100, no matter be flexible display device be in the state of expanding or the state of curling, can both avoid flexible display screen 100 to cave in the clearance between supporting part 6, has effectively improved flexible display screen 100's surface smoothness nature.
Therefore, in the embodiment of the present invention, by improving the structure of the flexible supporting layer 1, the uniformity of the stress distribution of the flexible display screen 100 is improved, the damage to the inner ring screen of the flexible display screen 100 is avoided, and meanwhile, the reliability of the flexible supporting layer 1 is improved and the surface smoothness of the flexible display screen 100 is improved.
In addition, it should be noted that, at the same time, the state of the flexible display screen 100 and the state of the support structure are the same, when the flexible display device is rolled, the flexible display screen 100 and the support structure are both in the rolled state, and when the flexible display device is rolled, the flexible display screen 100 and the support structure are both in the rolled state. In the embodiment of the present invention, "the flexible display device is in the unfolded state", "the flexible display screen 100 is in the unfolded state", and "the support structure is in the unfolded state" refer to the same state, and similarly, "the flexible display device is in the rolled state", "the flexible display screen 100 is in the rolled state", and "the support structure is in the rolled state" also refer to the same state.
In one embodiment, referring again to fig. 4, the first surface 4 and the second surface 5 of the first supporting layer 2 are parallel and are flat surfaces. The flat surface according to the embodiment of the present invention is a plane without unevenness, and when the first surface 4 and the second surface 5 are parallel and are both flat surfaces, the first support layer 2 is a film layer with a uniform film thickness.
With such a configuration, when the flexible display screen 100 is supported by the flexible support layer 1, the flexible display screen 100 is opposite to the first flat surface 4 of the first support layer 2, and with reference to fig. 5 and 6, fig. 6 is a schematic diagram of a winding structure when the flexible display screen is supported by the support structure provided in the embodiment of the present invention, no matter the flexible display device is in an unfolded state or a winding state, the first support layer 2 can stably support the flexible display screen 100, so as to better maintain the surface flatness of the flexible display screen 100, and especially in the winding state, the flexible display screen 100 can be prevented from sinking toward a gap between the support portions 6 under the action of stress.
In an embodiment, as shown in fig. 7, fig. 7 is a top view of the flexible supporting layer 1 according to an embodiment of the present invention, the supporting portion 6 is a strip-shaped structure, an extending direction of the supporting portion 6 is perpendicular to a curling direction X of the flexible display screen 100, and the plurality of supporting portions 6 are arranged along the curling direction X of the flexible display screen 100.
When the flexible display device is wound for a plurality of turns, the stress generated by the same turn of the flexible display device tends to be consistent, for example, the bending stress generated by the innermost turn tends to be consistent, and the bending stress generated by the outermost turn also tends to be consistent. It can be understood that, the bending resistance of the local flexible supporting layer 1 at the position of the single supporting portion 6 is consistent, when the supporting portion 6 is arranged in the above manner, after the flexible display device is wound for a plurality of turns, the single supporting portion 6 will be located on the same turn of the flexible display device, and will not span the plurality of turns, so that the local stiffness of the flexible supporting layer 1 on the same turn is similar, and then the bending stress transmitted to the flexible display screen 100 is also similar, thereby further providing the stress uniformity of the flexible display screen 100 at different positions. Moreover, the supporting parts 6 at the innermost circle position can be ensured to have larger film thickness, so that the flexible supporting layer 1 at the position can bear larger bending stress, and the stress concentration of the flexible display screen 100 at the position is avoided.
Further, referring to fig. 4 again, along the curling direction X of the flexible display screen 100, the film thickness of the plurality of supporting portions 6 in the direction perpendicular to the plane of the first supporting layer 2 decreases progressively, so that the stiffness of the flexible supporting layer 1 decreases progressively along the direction smoothly, and abrupt change of the stiffness of the flexible supporting layer 1 is avoided, thereby avoiding abrupt change of the stress transmitted to the flexible display screen 100.
In addition, please refer to fig. 7 again, the lengths H of the plurality of supporting portions 6 in the extending direction thereof may be made equal to further improve the force uniformity of the flexible display screen 100.
In one embodiment, along the rolling direction X of the flexible display screen 100, the width of the plurality of supporting portions 6 in the direction perpendicular to the extending direction thereof decreases, and/or the distance between two adjacent supporting portions 6 increases.
Exemplarily, as shown in fig. 8, fig. 8 is another top view of the flexible support layer 1 provided in the embodiment of the present invention, along the curling direction X of the flexible display screen 100, the width b of the plurality of support portions 6 in the direction perpendicular to the extending direction thereof decreases, and the distance L between two adjacent support portions 6 is constant. Alternatively, as shown in fig. 9, fig. 9 is a further top view of the flexible support layer 1 provided in the embodiment of the present invention, along the rolling direction X of the flexible display screen 100, the width b of the plurality of support portions 6 in the direction perpendicular to the extending direction thereof is constant, and the distance L between two adjacent support portions 6 increases. Still alternatively, as shown in fig. 10, fig. 10 is a further top view of the flexible support layer 1 provided in the embodiment of the present invention, along the rolling direction X of the flexible display screen 100, the width b of the plurality of support portions 6 in the direction perpendicular to the extending direction thereof decreases, and at the same time, the distance L between two adjacent support portions 6 increases.
By further performing differential design on the width and/or the distance of the supporting parts 6 at different positions, the rigidity of the flexible supporting layer 1 near the inner ring position is further increased, so that the bending resistance of the flexible supporting layer 1 is higher, larger bending stress is borne, and stress concentration of the flexible display screen 100 at the inner ring position is further avoided.
In one embodiment, referring to fig. 4, as shown in fig. 11 and 12, fig. 11 is a cross-sectional view taken along a direction a1-a2 in fig. 7, and fig. 12 is another cross-sectional view taken along a direction a1-a2 in fig. 7, the supporting part 6 has a first cross-section 9, the first cross-section 9 is perpendicular to a plane of the first supporting layer 2 and perpendicular to an extending direction of the supporting part 6, and the first cross-section 9 has a rectangular, semicircular or semi-elliptical shape.
When the first cross-sections 9 have different shapes, the bending section coefficients of the support portions 6 are different. Exemplary, rectangular cross-section corresponds to bending section modulus
b and h being cross-sectionsLength and width, and bending modulus corresponding to circular cross section
d is the diameter of the cross section. When the cross-sectional areas are the same, the bending section modulus for a circular cross-section is generally greater.
Therefore, the first section 9 of the support portion 6 can be set to different shapes according to the actual curling condition of the flexible display screen 100, so as to adjust the bending resistance of the support portion 6 to different degrees, thereby being suitable for flexible display devices with different curling radiuses. For example, if the flexible display device has a smaller radius of curvature and the bending degree of each loop of the flexible display device is larger, the cross-sectional shape with a larger bending-resistant cross-sectional coefficient may be selected, so that the support portion 6 bears bending stress as much as possible, and further protects the flexible display screen 100 to a greater extent.
In an implementation manner, as shown in fig. 13, fig. 13 is another schematic structural diagram of a support structure according to an embodiment of the present invention, where the support structure further includes a planarization layer 10, the planarization layer 10 is located on a side of the second support layer 3 facing away from the first support layer 2, and an elastic modulus of the planarization layer 10 is smaller than elastic moduli of the first support layer 2 and the second support layer 3; the planarization layer 10 covers the flexible support layer 1 in a direction perpendicular to the plane of the first support layer 2, and the surface of the planarization layer 10 remote from the second support layer 3 is a planarized surface.
It should be noted that the leveling layer 10 is made of a soft material, and is not used for supporting, but only plays a leveling role, and the leveling layer 10 may be specifically formed by using a soft rubber material.
After the planarization layer 10 is disposed, as shown in fig. 14, fig. 14 is another schematic diagram of a curling structure when the flexible display screen is supported by the support structure provided in the embodiment of the present invention, after the flexible display device is curled, one side of the flexible display screen 100 contacts with the first support layer 2, and the other side contacts with the flat surface of the planarization layer 10, so that the planarization layer 10 can be used to keep the other side of the flexible display screen 100 flat, prevent the side from sinking in the gap between the support portions 6, and further improve the surface flatness of the flexible display screen 100.
Further, the elastic modulus of the first support layer 2 is E1, the elastic modulus of the second support layer 3 is E2, the elastic modulus of the flattening layer 10 is E3,
will be provided with
The minimum value of (2) is set to 5, so that the difference between the rigidity of the leveling layer 10 and the rigidity of the supporting layer can be enough, and the material of the leveling layer 10 is soft and only used for leveling. And further will
Set up to 10, can avoid leveling layer 10 too soft again, when leveling layer 10 did not fill the clearance between the supporting part 6, flexible display device curls the back, can reduce leveling layer 10 the sunken risk in the clearance between supporting part 6, and then makes its better screen flatness who maintains flexible display screen 100.
Further, as shown in fig. 15, fig. 15 is a schematic view of another unfolding structure when the flexible display screen is supported by the supporting structure provided in the embodiment of the present invention, and the leveling layer 10 can also fill gaps between the plurality of supporting portions 6, so that the flexible display device can be effectively prevented from sinking in the gaps between the supporting portions 6 under the action of stress by the curled leveling layer 10, and the screen flatness effect of the flexible display screen 100 can be further improved.
It should be noted that the leveling layer 10 may be a functional film prepared in advance, and after the second supporting layer 3 is formed, the leveling layer 10 is directly attached to one side of the second supporting layer 3, or the leveling layer 10 may also be directly deposited on one side of the second supporting layer 3 in a film coating manner.
When leveling layer 10 adopts attached mode setting in second supporting layer 3 one side, combine fig. 14, if leveling layer 10 need not to fill the supporting part 6 clearance, leveling layer 10 is the functional film that both sides are the level surface, and this kind of functional film need not to consider factors such as counterpoint precision when attached only to make it cover flexible supporting layer 1 can. Or, referring to fig. 15, if the leveling layer 10 needs to fill the gap of the supporting portion 6, and one side of the leveling layer 10 is a concave-convex undulating surface, when the leveling layer 10 is attached, the convex portion is aligned with the gap of the supporting portion 6, and the concave portion is aligned with the position of the supporting portion 6, and then the convex portion is attached to the flexible supporting layer 1.
Further, referring to fig. 14 and fig. 15 again, the sum of the film thicknesses of the planarization layer 10 and the flexible support layer 1 increases along the rolling direction X of the flexible display screen 100.
As shown in fig. 16, fig. 16 is a schematic structural diagram of a winding shaft according to an embodiment of the present invention, and for a flexible display device having a rolled state, the flexible display device generally further includes a winding shaft 11 having a cylindrical shape, and the support structure and the flexible display screen 100 are wound around the winding shaft 11. Through the design of difference to the thick sum of membrane of leveling layer 10 and flexible supporting layer 1, can make inner circle position department, that is to say the membranous layer thickness of bearing structure and spool 11 junction less, flexible display device only can smooth transition under less segment difference when curling around spool 11, improves the effect of curling.
In an implementation manner, as shown in fig. 17, fig. 17 is a schematic structural diagram of a glue layer according to an embodiment of the present invention, and a glue layer 12 is further disposed between the first support layer 2 and the second support layer 3 to improve adhesion between the first support layer 2 and the second support layer 3, so that when the flexible display device is curled, the second support layer 3 is prevented from being separated from the first support layer 2, and the second support layer 3 is effectively ensured to adjust local stiffness of the flexible support layer 1.
Based on the same inventive concept, an embodiment of the present invention further provides a flexible display device, as shown in fig. 18, fig. 18 is a schematic structural diagram of the flexible display device provided in the embodiment of the present invention, where the flexible display device includes: the flexible display screen 100 comprises a light emitting surface 200 and a non-light emitting surface 300; in the above-mentioned supporting structure 400, the supporting structure 400 is located on the non-light-emitting surface side of the flexible display 100. The specific structure of the supporting structure 400 has been described in detail in the above embodiments, and is not described herein again. Moreover, the flexible display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book, or a television.
Because the flexible display device provided by the embodiment of the invention comprises the supporting structure 400, when the flexible display device is curled, the stress of the flexible display screen 100 is uniformly distributed, and meanwhile, the breakage of the supporting layer is avoided, and the surface flatness of the flexible display screen 100 is improved.
Further, referring to fig. 18 again, when the flexible display screen 100 is in the unfolded state, in a direction perpendicular to the plane of the flexible display screen 100, the first support layer 2 covers the flexible display screen 100, and at this time, each area of the flexible display screen 100 is stably supported by the first support layer 2, so that the support effect of the first support layer 2 and the surface flatness of the flexible display screen 100 are further improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A support structure for supporting a flexible display screen, the support structure comprising a flexible support layer comprising a first support layer and a second support layer;
the first support layer comprises a first surface and a second surface which are oppositely arranged, and when the support structure is in an unfolded state, the first surface is the surface, facing the flexible display screen, of the first support layer;
the second support layer is positioned on one side of the second surface of the first support layer, the second support layer comprises a plurality of support parts arranged at intervals, the support parts comprise a first support part and a second support part, and the direction of the first support part pointing to the second support part is the curling direction of the flexible display screen; when the supporting structure is in an unfolded state, the film thickness of the first supporting part is larger than that of the second supporting part in the direction perpendicular to the plane where the first supporting layer is located.
2. The support structure of claim 1,
the first surface and the second surface are parallel and are flat surfaces.
3. The support structure of claim 1,
the supporting part is a strip-shaped structure, the extending direction of the supporting part is perpendicular to the curling direction of the flexible display screen, and the supporting parts are arranged along the curling direction of the flexible display screen.
4. The support structure of claim 3,
and along the curling direction of the flexible display screen, the film thickness of the plurality of supporting parts in the plane direction perpendicular to the first supporting layer is gradually reduced.
5. The support structure of claim 3,
along the curling direction of the flexible display screen, the width of the support parts in the direction perpendicular to the extending direction of the support parts is gradually reduced, and/or the distance between every two adjacent support parts is gradually increased.
6. The support structure of claim 3,
the plurality of support portions are equal in length in the extending direction thereof.
7. The support structure of claim 3,
the supporting part is provided with a first cross section, the first cross section is perpendicular to the plane of the first supporting layer and perpendicular to the extending direction of the supporting part, and the shape of the first cross section is rectangular, semicircular or semi-elliptical.
8. The support structure of claim 1,
the supporting structure further comprises a leveling layer, the leveling layer is positioned on one side, back to the first supporting layer, of the second supporting layer, and the elastic modulus of the leveling layer is smaller than those of the first supporting layer and the second supporting layer;
in the direction perpendicular to the plane of the first supporting layer, the leveling layer covers the flexible supporting layer, and the surface, far away from the second supporting layer, of the leveling layer is a flat surface.
9. The support structure of claim 8,
the elastic modulus of the first support layer is E1, the elastic modulus of the second support layer is E2, the elastic modulus of the planarization layer is E3,
10. the support structure of claim 8,
the leveling layer fills gaps between the plurality of supporting parts.
11. The support structure of claim 8,
and along the curling direction of the flexible display screen, the sum of the film thicknesses of the leveling layer and the flexible supporting layer is increased progressively.
12. The support structure of claim 1,
and a glue layer is also arranged between the first supporting layer and the second supporting layer.
13. A flexible display device, comprising:
the flexible display screen comprises a light emitting surface and a non-light emitting surface;
the support structure of any one of claims 1 to 12, wherein the support structure is located on the non-light-emitting surface side of the flexible display screen.
14. The flexible display device of claim 13,
when the flexible display screen is in an unfolded state, the first supporting layer covers the flexible display screen in a direction perpendicular to a plane where the flexible display screen is located.
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| CN113470535B (en) | 2022-04-01 |
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