CN110752232B - Flexible display panel and display device - Google Patents
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- CN110752232B CN110752232B CN201910936230.1A CN201910936230A CN110752232B CN 110752232 B CN110752232 B CN 110752232B CN 201910936230 A CN201910936230 A CN 201910936230A CN 110752232 B CN110752232 B CN 110752232B
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- G—PHYSICS
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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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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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Abstract
The invention discloses a flexible display panel and a display device, wherein a plurality of deformation units are arranged in a deformation area of a supporting layer, and each deformation unit comprises: the device comprises a first signal generation structure, a second signal generation structure and a deformation layer, wherein the first signal generation structure and the second signal generation structure are oppositely arranged, and the deformation layer is positioned between the first signal generation structure and the second signal generation structure. Or a plurality of main gas storage structures are arranged in the deformation area of the supporting layer, and an auxiliary gas storage structure communicated with the main gas storage structures is arranged. The neutral plane of the bending area of the flexible display panel can be adjusted along with the adjustment, the adverse effect of stress is reduced, the bending area can be in smooth transition, the damage to the flexible display panel caused by excessive bending is avoided, and the reliability of the flexible display panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel and a display device.
Background
With the development of display technology, the demands of consumers for display panels are more and more diversified and personalized. The flexible display panel has the advantages of flexibility, portability and the like, and is favored by consumers. However, when the flexible display panel is bent, the flexible display panel is stressed to generate defects, so that the reliability of the flexible display panel is reduced.
Disclosure of Invention
The embodiment of the invention provides a flexible display panel and a display device, which are used for solving the problem that the flexible display panel has defects when being bent.
An embodiment of the present invention provides a flexible display panel, including:
a flexible display substrate comprising: a bending zone;
the supporting layer covers one side of the flexible display substrate; and the support layer comprises a deformation zone; the deformation area covers the bending area; the deformation area comprises a plurality of deformation units at the pixel level;
each of the deformation units includes: the device comprises a first signal generating structure, a second signal generating structure and a deformation layer, wherein the first signal generating structure and the second signal generating structure are arranged oppositely, and the deformation layer is positioned between the first signal generating structure and the second signal generating structure;
the deformation layer is used for generating deformation when the first signal generation structure and the second signal generation structure are respectively loaded with signals.
An embodiment of the present invention further provides a flexible display panel, including:
a flexible display substrate comprising: a bending zone and a flat zone; the bending area and the straight area are arranged along a first direction;
the supporting layer covers one side of the flexible display substrate; and the support layer comprises a deformation zone; the deformation area covers the bending area; the deformation area comprises a plurality of main gas storage structures which extend along the second direction and are arranged along the first direction; the second direction is different from the first direction;
a plurality of secondary gas storage structures, one of the secondary gas storage structures in communication with one of the primary gas storage structures; and the auxiliary gas storage structure and the bending area have no overlapping area;
the main gas storage structure is used for stretching in a direction perpendicular to the flexible display substrate when the bending area of the flexible display substrate is bent.
The embodiment of the invention also provides a display device which comprises the flexible display panel.
The invention has the following beneficial effects:
in the flexible display panel and the display device provided by the embodiments of the present invention, the deformation region of the supporting layer is provided with a plurality of deformation units, and each deformation unit includes: the device comprises a first signal generation structure, a second signal generation structure and a deformation layer, wherein the first signal generation structure and the second signal generation structure are oppositely arranged, and the deformation layer is positioned between the first signal generation structure and the second signal generation structure. Since the deformation layer may be used for deformation when loading the first signal generating structure and the second signal generating structure with signals, respectively. Like this buckle the district at flexible display panel when buckling, can change along with the camber of buckling, the adjustment is to first signal generation structure and the loaded signal of second signal generation structure, so that deformation takes place for the deformation layer, thereby make the thickness change on deformation layer, so that the neutral plane of the bending zone of flexible display panel adjusts along with it, reduce the adverse effect of stress, make bending zone smooth transition, and then avoid excessively buckling the damage that causes flexible display panel, improve flexible display panel's reliability. Or, set up a plurality of main gas storage structures through the deformation district at the supporting layer, and set up the supplementary gas storage structure with main gas storage structure intercommunication, when the bending region of flexible display panel buckles, along with the curvature change of buckling, main gas storage structure stretches out and draws back in the direction of the flexible display substrate of perpendicular to, in order to discharge the gas of inside to supplementary gas storage structure, thereby make the thickness change of main gas storage structure, so that the neutral plane of the bending region of flexible display panel adjusts along with it, reduce the adverse effect of stress, make bending region smooth transition, and then avoid excessively buckling the damage that causes flexible display panel, improve flexible display panel's reliability.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel in a related art when bent;
FIG. 2 is a schematic top view of some flexible display panels according to an embodiment of the invention;
FIG. 3 is a schematic view of some of the cross-sectional structures shown in FIG. 2 taken along the direction AA';
FIG. 4 is a schematic diagram of some structures of a flexible display panel according to an embodiment of the present invention when the flexible display panel is bent;
FIG. 5 is a schematic cross-sectional view along AA' of FIG. 2;
FIG. 6 is a schematic top view of deformation zones in an embodiment of the present invention;
FIG. 7 is a schematic top view of a deformation zone in an embodiment of the present invention;
FIG. 8 is a schematic top view of a deformation zone in an embodiment of the present invention;
FIG. 9 is a schematic top view of a deformation zone in an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a top view of still other flexible display panels according to an embodiment of the present invention;
FIG. 11 is a schematic view of some of the cross-sectional structures shown in FIG. 10 taken along the direction AA';
FIG. 12 is a schematic view of still other structures of a flexible display panel during bending according to an embodiment of the present invention;
fig. 13 is still another structural schematic diagram of the flexible display panel in the embodiment of the invention when being bent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a flexible display panel in a folded state. Due to the process limitation of the flexible display panel, when the flexible display panel is bent along the bending axis S, the flexible display panel is often in a state where the curvature at the position of the bending axis is large and the bending radius is small. Therefore, the flexible display panel can be subjected to the maximum bending stress at the bending shaft S position to cause excessive bending, so that the flexible display panel is damaged and easily generates defects, and the display failure condition is generated.
In view of the above, as shown in fig. 2 and fig. 3, fig. 2 is a schematic top view structure diagram of a flexible display panel according to an embodiment of the present invention. Fig. 3 is a schematic cross-sectional view of the flexible display panel shown in fig. 2 along the AA' direction.
Referring to fig. 2 and fig. 3, a flexible display panel according to an embodiment of the present invention may include:
a flexible display substrate 100 comprising: a bending zone SS;
a support layer 200 covering one side of the flexible display substrate 100; and the support layer 200 includes a deformation region XS; the deformation region XS covers the bending region SS; and the deformation region XS includes a plurality of deformation units 210 at the pixel level;
each deformation unit 210 includes: a first signal generating structure 211 and a second signal generating structure 212 which are oppositely arranged, and a deformation layer 213 which is positioned between the first signal generating structure 211 and the second signal generating structure 212;
the deformation layer 213 is used for generating deformation when the first signal generating structure 211 and the second signal generating structure 212 are loaded with signals, respectively.
In the flexible display panel provided in the embodiment of the present invention, the deformation region of the supporting layer is provided with a plurality of deformation units, and each deformation unit includes: the device comprises a first signal generation structure, a second signal generation structure and a deformation layer, wherein the first signal generation structure and the second signal generation structure are oppositely arranged, and the deformation layer is positioned between the first signal generation structure and the second signal generation structure. Since the deformation layer may be used for deformation when loading the first signal generating structure and the second signal generating structure with signals, respectively. Like this buckle the district at flexible display panel when buckling, can change along with the camber of buckling, the adjustment is to first signal generation structure and the loaded signal of second signal generation structure, so that deformation takes place for the deformation layer, thereby make the thickness change on deformation layer, so that the neutral plane of the bending zone of flexible display panel adjusts along with it, reduce the adverse effect of stress, make bending zone smooth transition, and then avoid excessively buckling the damage that causes flexible display panel, improve flexible display panel's reliability.
In specific implementation, in the embodiment of the present invention, as shown in fig. 2 and fig. 4, the flexible display substrate 100 may further include: a flat area; the bent section SS and the flat section are arranged along the first direction F1. For example, the flexible display substrate 100 includes: two flat zones: FS-1 and FS-2, the flat region FS-1 and the flat region FS-2 are respectively located at both sides of the inflection region SS, and the flat region FS-1, the inflection region SS and the flat region FS-2 are sequentially arranged along a first direction F1 (i.e., the direction of the arrow F1). And, the bending section SS has a center line L0 perpendicular to the first direction F1; wherein the bending zone SS is substantially symmetrically arranged with respect to the centre line L0. The center line L0 is parallel to the surface of the flexible display substrate 100. That is, the first direction F1 is parallel to the surface on which the flexible display substrate 100 is located, and has a second direction F2 perpendicular to the first direction F1 on the surface parallel to the surface on which the flexible display substrate 100 is located, and the center line L0 extends along the second direction F2.
Referring to fig. 2 and 4, when the bending region SS of the flexible display panel is bent (toward the side having the supporting layer 200 or toward the side away from the supporting layer 200), the signals applied to the first signal generating structure 211 and the second signal generating structure 212 may be adjusted along with the change of the bending curvature, so as to deform the deformation layer 213, and thus change the thickness of the deformation layer 213. For example, the thickness W1 of the deformation unit 210 at a position close to the center line L0 may be made smaller than the thickness W2 of the deformation unit 210 at a position far from the center line L0, so that the thickness of the deformation region XS of the support layer 200 is gradually increased in a direction pointing from the center line L0 to the flat region. Therefore, the neutral surface of the bending area SS of the flexible display panel can be adjusted along with the adjustment, the adverse effect of the stress of the bending area SS is reduced, the bending area SS is easier to bend, the damage to the flexible display panel caused by excessive bending is avoided, and the reliability of the flexible display panel is improved.
In practical implementation, in the embodiment of the present invention, as shown in fig. 2 and fig. 4, the deformation region XS and the bending region SS may be overlapped. Of course, the present invention includes, but is not limited to, this.
In particular implementations, in embodiments of the invention, a flexible display panel may include a display area having a bending region and a flat region. Wherein the display area may include pixel units. The pixel unit may include a plurality of sub-pixels. Each sub-pixel may include a light emitting device and a pixel driving circuit for driving the light emitting device to emit light. The light-emitting device comprises an anode, a light-emitting functional layer and a cathode which are stacked. Further, the light emitting device may include: at least one of Organic Light Emitting Diodes (OLED) and Quantum Dot Light Emitting Diodes (QLED). Moreover, the general pixel driving circuit may include a plurality of transistors such as a driving transistor and a switching transistor, and a storage capacitor, and the specific structure and the operation principle thereof may be the same as those in the prior art, which is not described herein again.
In specific implementation, in the embodiment of the present invention, the pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so as to implement an image display function through red, green, and blue color mixing. The pixel unit can also comprise a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel so as to realize the image display function through red, green, blue and white color mixing.
In specific implementation, in the embodiment of the present invention, as shown in fig. 3, the flexible display panel may further include: the thin film transistor array layer 310 is located on one side of the flexible display substrate 100, and the light emitting device layer 320 is located on one side of the thin film transistor array layer 310, which is away from the substrate. The support layer 200 is located on a side of the flexible display substrate 100 facing away from the thin film transistor array layer. Among them, the thin film transistor array layer 310 may include: forming each film layer of the transistor and each film layer forming the capacitor. The light emitting device layer 320 may include an anode, a light emitting function layer, and a cathode, which are stacked.
It should be noted that the morphing unit 210 in the embodiment of the present invention is at a pixel level, and may refer to: the size of the deformation unit 210 may be substantially the same as the size of the pixel unit. Through preparing deformation unit 210 for the size of pixel cell size, can make the thickness adjustment more meticulous like this, can further realize the smooth transition of buckling to be favorable to realizing the angle of buckling, reduce the curved problem of crossing.
In practical implementation, as shown in fig. 4, when the bending region SS of the flexible display substrate 100 is bent, the curvature of the bending region SS gradually decreases from the center line L0 to both sides. Illustratively, the curvature gradually decreases and the radius of curvature gradually increases in a direction from the center line L0 toward the flat area FS-1. Further, the curvature gradually decreases and the radius of curvature gradually increases from the center line L0 toward the flat area FS-2. Therefore, the bending area SS can be further smoothly transited during bending, so that the bending angle is favorably realized, and the over-bending problem is reduced.
Generally, Ion-exchange Polymer Metal Composite (IPMC) materials, Electro-Active Polymer (EAP) materials, piezoelectric materials, Polymer gel materials, and Shape Memory Alloy (SMA) materials can be deformed under the action of an electric field. In practical implementation, in an embodiment of the present invention, the material of the deformation layer 213 may include: at least one of an ion-exchanged polymeric metal material, an electroactive polymer material, a piezoelectric material, a polymer gel material, and a shape memory alloy material. Also, the deformation layer 213 is used to generate deformation when a voltage signal is applied to the first signal generating structure 211 and the second signal generating structure 212, respectively.
It should be noted that, by applying voltage signals with different voltage values to the first signal generating structure 211 and the second signal generating structure 212, an electric field can be formed between the first signal generating structure 211 and the second signal generating structure 212 to deform the deformation layer 213. Also, the electric field intensity at both sides of the deformation layer 213 may be made different by controlling the voltage values of the voltage signals input to the first signal generating structure 211 and the second signal generating structure 212, so that the deformation of the deformation layer 213 is made different in size, thereby controlling the thickness of the deformation layer 213 in the direction perpendicular to the flexible display substrate 100. Furthermore, when the bending region SS is bent, the thickness of the deformation layer 213 can be controlled by controlling the voltage values of the voltage signals input into the first signal generating structure 211 and the second signal generating structure 212 in different deformation units, for example, the thickness of the deformation unit 210 near the center line L0 can be controlled to be smaller than the thickness of the deformation unit 210 far from the center line L0, so that the thickness of the deformation region XS of the supporting layer 200 is gradually increased in a direction pointing to the flat region from the center line L0.
Illustratively, the material of the deformation layer 213 may be an IPMC material, such that the first signal generating structure 211 and the second signal generating structure 212 are respectively loaded with voltage signals with different voltage values, and an electric field may be formed between the first signal generating structure 211 and the second signal generating structure 212, so that the deformation layer 213 formed of the IPMC material may be deformed.
Illustratively, the material of the deformation layer 213 may also be an EAP material, such as silicone, acrylic, or the like. Thus, by applying voltage signals with different voltage values to the first signal generating structure 211 and the second signal generating structure 212, an electric field can be formed between the first signal generating structure 211 and the second signal generating structure 212, so that the deformation layer 213 made of the EAP material can be deformed. In addition, the EAP material has the advantages of large resilience, fast response, low density, tear resistance and the like, so the EAP material is applied to the flexible display panel and the reliability of the flexible display panel can be further improved.
Illustratively, the material of the deformation layer 213 may also be a piezoelectric material, such as a piezoelectric polymer, a piezoelectric crystal, or the like. Thus, by applying voltage signals with different voltage values to the first signal generating structure 211 and the second signal generating structure 212, an electric field can be formed between the first signal generating structure 211 and the second signal generating structure 212, so that the deformation layer 213 formed of a piezoelectric material can be deformed.
Illustratively, the material of the deformation layer 213 may also be a polymer gel material. Thus, by applying voltage signals with different voltage values to the first signal generating structure 211 and the second signal generating structure 212, an electric field can be formed between the first signal generating structure 211 and the second signal generating structure 212, so that hydrogen ions in the polymer gel material can enter or escape, and the deformation layer 213 can be deformed by expansion and contraction.
Illustratively, the material of the deformation layer 213 may also be a shape memory alloy material. In this way, the first signal generating structure 211 and the second signal generating structure 212 are respectively loaded with voltage signals with different voltage values, so that the first signal generating structure 211 and the second signal generating structure 212 can generate heat, and the deformation layer 213 has temperature and is deformed. By controlling the voltage values of the voltage signals applied to the first signal generating structure 211 and the second signal generating structure 212, the temperature of the deformation layer 213 can be changed, thereby achieving the purpose of deformation.
In general, a magnetic field deformable material can be deformed under the action of a magnetic field. In a specific embodiment, in an embodiment of the present invention, the material of the deformation layer 213 may also include: a magnetic field deformable material; wherein the deformation layer 213 is configured to deform when a signal is applied to the first signal generating structure 211 and the second signal generating structure 212 to generate a magnetic field. Illustratively, the first signal generating structure 211 has N-polarity and the second signal generating structure 212 has S-polarity, a magnetic field is generated between the first signal generating structure 211 and the second signal generating structure 212. And by controlling the magnitude of the generated magnetic field, the degree of deformation of the deformation layer 213 can be controlled, thereby controlling the thickness of the deformation layer 213 in the direction perpendicular to the flexible display substrate 100.
In practical implementation, in the embodiment of the present invention, as shown in fig. 3, when the bending region SS is not bent, the thickness of each shape-changing unit 210 in the shape-changing region XS in the direction perpendicular to the flexible display panel may be the same. Therefore, the deformation units 210 can be formed by adopting the same process and setting the same parameters, so that the process preparation difficulty is reduced.
In practical implementation, in the embodiment of the present invention, as shown in fig. 5 and fig. 2, the thickness of the shape-changing unit 210 close to the center line L0 in the direction perpendicular to the flexible display substrate 100 may also be smaller than the thickness of the shape-changing unit 210 far from the center line L0 in the direction perpendicular to the flexible display substrate 100. For example, when the bending region SS is not bent, the thickness of the shape-changing unit 210 close to the center line L0 in the shape-changing region XS in the direction perpendicular to the flexible display substrate 100 may be smaller than the thickness of the shape-changing unit 210 far from the center line L0 in the direction perpendicular to the flexible display substrate 100. Thus, when the bending region SS is bent, the thickness of the deformation unit 210 can be changed by adjusting the signals input into the first signal generating structure 211 and the second signal generating structure 212. The deformation area XS can be preferentially thinned, and the neutral surface of the bending area SS is further adjusted when the bending area SS is bent, so that the bending is further smoothly transited, the bending angle is favorably realized, and the over-bending problem is reduced.
In practical implementation, in the embodiment of the present invention, as shown in fig. 2, 6 to 9, a plurality of morphable units 210 can be uniformly distributed in the morphable region XS. For example, a plurality of morphable elements 210 may be arranged in an array within the morphable region XS. This can further make the bending curvature uniform and larger. Of course, the present invention includes, but is not limited to, this.
In practical implementation, as shown in fig. 2, a plurality of morphable units 210 may be arranged in a plurality of rows along the row direction (e.g., the second direction F2), and every two adjacent rows of morphable units 210 are arranged in a straight line along the row direction (e.g., the second direction F2). This makes it possible to increase the bending curvature uniformly during bending. For example, the orthographic projection of the shape changing unit 210 on the flexible display substrate 100 may be a regular pattern such as a rectangle. For example, the rectangle has two sets of opposite sides, wherein one set of opposite sides is parallel to the first direction F1, and the other set of opposite sides is parallel to the second direction F2. This can further make the bending curvature uniform and larger.
In practical implementation, as shown in fig. 6 and 7, in the embodiment of the invention, the shape-changing units 210 are arranged in a plurality of columns along the row direction (e.g., the second direction F2), and at least two adjacent rows of the shape-changing units 210 are arranged in a staggered manner. For example, the orthographic projection of the shape changing unit 210 on the flexible display substrate 100 may be a regular pattern such as a rectangle. For example, as shown in FIG. 6, every two adjacent rows of shape-changing units 210 are arranged in a staggered manner. And one set of opposite sides of the rectangle is parallel to the first direction F1, and the other set of opposite sides is parallel to the second direction F2. As shown in FIG. 7, every two adjacent rows of deformation units 210 are arranged in a staggered manner. And one diagonal of the rectangle is parallel to the first direction F1 and the other diagonal is parallel to the second direction F2. That is, the diagonals of the morphable elements 210 in each column extend along a same line in the column direction (e.g., the first direction F1), and the diagonals of the morphable elements 210 in each row extend along a same line in the row direction (e.g., the second direction F2). This can further make the bending curvature uniform and larger.
In practical implementation, as shown in fig. 8, in the embodiment of the invention, the orthographic projection of each shape-changing unit 210 on the flexible display substrate 100 is a regular hexagon, and a plurality of shape-changing units 210 are arranged in the shape-changing region XS in a honeycomb manner. This can further make the bending curvature uniform and larger. Moreover, by arranging the shape-changing units 210 in the shape-changing region XS in a honeycomb shape, the shape-changing units can be arranged more closely.
In specific implementation, in the embodiment of the present invention, as shown in fig. 9, the orthographic projection of each shape changing unit 210 on the flexible display substrate 100 is a regular triangle, and a plurality of shape changing units 210 are arranged in a plurality of rows along a column direction (for example, a first direction F1); in each row, the shape changing units 210 with forward regular triangle shape projected on the flexible display substrate 100 and the shape changing units 210 with reverse regular triangle shape projected on the flexible display substrate 100 are alternately arranged. This also allows for a more compact arrangement. For example, one shape-changing unit 210 with a forward projection being a forward regular triangle and one shape-changing unit 210 with a forward projection being a backward regular triangle may be disposed at corresponding positions of two adjacent rows. This can further make the bending curvature uniform and larger. And may further allow for a tighter packing.
In practical implementation, in the embodiment of the present invention, there is a gap between the deformation units 210. Illustratively, the width of the gap between every two adjacent deformation units 210 may be the same. Therefore, the distribution uniformity of the deformation units 210 can be improved, and the smooth transition of bending can be further realized, so that the bending angle can be favorably realized, and the over-bending problem can be reduced.
In an actual process, the same or different features may not be completely the same due to limitations of process conditions or other factors, and therefore, the same relationship between the features may be satisfied only by approximately satisfying the above conditions, and all of the features fall within the scope of the present invention. For example, the above-described identity may be the same as allowed within an error allowable range.
Based on the same inventive concept, the present invention provides another flexible display panel, which is modified from the foregoing embodiments. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.
As shown in fig. 10 and 11, another flexible display panel provided in an embodiment of the present invention may include:
a flexible display substrate 100 comprising: a bending zone SS and a flat zone; the bent section SS and the flat section are arranged in the first direction F1; the implementation of the straight region can refer to the above embodiments, which are not described herein;
a support layer 200 covering one side of the flexible display substrate 100; and the support layer 200 includes a deformation region XS; the deformation region XS covers the bending region SS; and the deformation zone XS includes a plurality of primary gas storage structures 220 extending along the second direction F2 and arranged along the first direction F1; the second direction F2 is different from the first direction F1;
a plurality of secondary gas storage structures 230, one secondary gas storage structure 230 in communication with one primary gas storage structure 220; and the auxiliary gas storage structure 230 has no overlapping area with the bending region SS;
the main gas storage structure 220 is used to expand and contract in a direction perpendicular to the flexible display substrate 100 when the bending region SS of the flexible display substrate 100 is bent.
According to the flexible display panel provided by the embodiment of the invention, the plurality of main gas storage structures are arranged in the deformation area of the supporting layer, and the auxiliary gas storage structures communicated with the main gas storage structures are arranged, so that when the bending area of the flexible display panel is bent, the main gas storage structures stretch in the direction vertical to the flexible display substrate along with the bending curvature change, so that the internal gas is discharged into the auxiliary gas storage structures, the thickness of the main gas storage structures is changed, the neutral surface of the bending area of the flexible display panel is adjusted along with the change of the bending curvature, the adverse effect of stress is reduced, the bending area can be in smooth transition, the damage to the flexible display panel caused by excessive bending is avoided, and the reliability of the flexible display panel is improved.
In specific implementation, in the embodiment of the present invention, as shown in fig. 10, a plurality of auxiliary gas storage structures 230 are located at the side of the flexible display substrate 100. This may prevent the auxiliary gas storage structure 230 from affecting the bending of the flexible display panel. Also, in practical applications, the flexible display panel has a certain thickness in a direction perpendicular to the flexible display substrate 100. By disposing the auxiliary gas storage structure 230 at the side of the flexible display panel, the volume of the auxiliary gas storage structure 230 can be set according to the thickness of the flexible display panel, so that the occupied space of the auxiliary gas storage structure 230 can be reduced.
In particular implementation, in the embodiment of the present invention, as shown in fig. 10, the bending region SS has a center line L0 perpendicular to the first direction F1, and the volume of the auxiliary gas storage structure 230 communicated with the main gas storage structure 220 near the center line L0 is greater than the volume of the auxiliary gas storage structure 230 communicated with the main gas storage structure 220 far from the center line L0. Since the thickness of the main gas storage structure 220 near the center line L0 in the direction perpendicular to the flexible display substrate 100 is smaller than the thickness of the main gas storage structure 220 far from the center line L0 in the direction perpendicular to the flexible display substrate 100 when the bending region SS of the flexible display panel is bent, the volume of the gas stored by the main gas storage structure 220 near the center line L0 is smaller than the volume of the gas stored by the main gas storage structure 220 far from the center line L0. That is, the volume of gas discharged from the primary gas storage structure 220 near the centerline L0 is greater than the volume of gas discharged from the primary gas storage structure 220 away from the centerline L0, and the gas discharged from the primary gas storage structure 220 enters the secondary gas storage structure 230, so that each secondary gas storage structure 230 can be made to adjust the volume of gas stored in the primary gas storage structure 220 as much as practical by making the volume of the secondary gas storage structure 230 in communication with the primary gas storage structure 220 near the centerline L0 greater than the volume of the secondary gas storage structure 230 in communication with the primary gas storage structure 220 away from the centerline L0.
Referring to fig. 10 and 12, when the flexible display substrate 100 is bent away from the side having the supporting layer 200, the intake air amount V2 corresponding to one main gas storage structure 220 satisfies the following relationship:
where R2 represents the distance from the bending axis S to the surface B1 of the flexible display substrate 100 facing the side of the support layer 200 when the flexible display panel is bent, t represents the thickness of the main gas storage structures 220 in the direction perpendicular to the flexible display substrate 100, n represents the length of one side of the main gas storage structure 220 immediately adjacent to the flexible display substrate 100 (i.e., the bottom surface SD2) in the first direction F1 in the direction perpendicular to the flexible display substrate 100, and L represents the length of one main gas storage structure 220 in the second direction F2. Thus, when the flexible display substrate 100 is bent away from the side having the support layer 200, the intake amount V2 corresponding to the main gas storage structure 220 can be adjusted according to the above formula, and the volume of the gas stored in the main gas storage structure 220 can be further adjusted according to the optimal mixture ratio.
Referring to fig. 10 and 13, when the flexible display substrate 100 is bent toward the side having the support layer 200, the intake air amount V1 corresponding to one main gas storage structure 220 satisfies the following relationship:
wherein R1 represents the distance between the bending axis S and the surface B2 of the flexible display substrate 100 facing away from the supporting layer 200 when the flexible display panel is bent, and t represents the distance between the bending axis S and the surface B2 perpendicular to the flexible display substrateIn the direction of the panel 100, the thickness of the main gas storage structure 220, n represents the length of the side of the main gas storage structure 220 immediately adjacent to the flexible display substrate 100 (i.e., the bottom surface SD2) in the first direction F1 in the direction perpendicular to the flexible display substrate 100, and L represents the length of the main gas storage structure 220 in the second direction F2. Thus, when the flexible display substrate 100 is bent toward the side having the support layer 200, the intake amount V2 corresponding to the main gas storage structure 220 can be adjusted according to the above formula, and the volume of the gas stored in the main gas storage structure 220 can be further adjusted according to the optimal mixture ratio.
In practical implementation, in the embodiment of the invention, as shown in fig. 10 and fig. 11, the supporting layer 200 is located on a side of the flexible display substrate 100 facing away from the thin film transistor array layer 310. Also, each primary gas storage structure 220 may include: a flexible top surface SD1 located on a side facing away from the flexible display substrate 100, a bottom surface SD2 in direct contact with the flexible display substrate 100, and a first side surface SC1 and a second side surface SC2 connected between the flexible top surface SD1 and the bottom surface SD 2; wherein the elastic top surface SD1, the bottom surface SD2, the first side surface SC1 and the second side surface SC2 form a hollow structure for storing gas. Like this when the bending region SS of flexible display substrate 100 buckles, because elastic top surface SD1 can carry out elastic deformation, when the volume that main gas storage structure 220 fills gas changes, can make main gas storage structure 220 change in the thickness of the direction of perpendicular to flexible display substrate 100, thereby make the neutral plane of the bending region SS of flexible display panel adjust thereupon, reduce the adverse effect of stress, make bending region SS can smooth transition, and then avoid excessively buckling the damage that causes the flexible display panel, improve the reliability of flexible display panel.
In specific implementation, in the embodiment of the present invention, as shown in fig. 10 and fig. 11, the flexible display panel may further include: a resilient structure 410 affixed between each adjacent two of the primary gas storage structures 220; wherein the first side SC1 of one primary gas storage structure 220 is connected to the second side SC2 of the other primary gas storage structure 220 by a resilient structure 410. Thus, the first side surface SC1, the second side surface SC2 and the bottom surface SD2 of the main gas storage structure 220 can be fixed, so that the elastic top surface SD1 can be deformed when the flexible display panel is bent, and the service life of the main gas storage structure 220 is prolonged.
In practical implementation, in the embodiment of the invention, as shown in fig. 12 and 13, when the bending region SS of the flexible display substrate 100 is bent, the length of the elastic structure 410 in the direction parallel to the flexible display substrate 100 is increased. When the bending area SS of the flexible display panel is bent, the neutral surface of the bending area SS of the flexible display panel can be further adjusted along with the bending area SS through the stretching of the elastic structure 410, the adverse effect of stress is reduced, the bending area SS can be in smooth transition, the damage to the flexible display panel caused by excessive bending is avoided, and the reliability of the flexible display panel is improved.
Further, when the bending region SS of the flexible display substrate 100 is bent, the length of the elastic structure 410 in a direction perpendicular to the flexible display substrate 100 may be made constant. In this way, the flexible display substrate 100 can be supported by the elastic structure 410, so as to improve the hardness of the flexible display substrate 100 and further improve the reliability of the flexible display panel.
It should be noted that, in practical applications, the elastic structure 410 may be made of an elastic material capable of performing the above-mentioned functions. However, since the elastic material has a certain elasticity, the length of the elastic structure 410 in the direction perpendicular to the flexible display substrate 100 may also vary when the flexible display panel is bent due to the limitation of the process conditions or other factors, and thus, there may be some deviation. Therefore, when the bending region SS of the flexible display substrate 100 is bent, the length of the elastic structure 410 in the direction perpendicular to the flexible display substrate 100 may be: the present invention is not limited to the above-described embodiments as long as the above conditions are substantially satisfied. For example, the above-described invariance may be an allowable invariance within an error allowable range.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the flexible display panel provided by the embodiment of the invention. The principle of the display device to solve the problem is similar to the flexible display panel, so the implementation of the display device can be referred to the implementation of the flexible display panel, and repeated details are not repeated herein.
In specific implementation, in the embodiment of the present invention, the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
In the flexible display panel and the display device provided by the embodiments of the present invention, the deformation region of the supporting layer is provided with a plurality of deformation units, and each deformation unit includes: the device comprises a first signal generation structure, a second signal generation structure and a deformation layer, wherein the first signal generation structure and the second signal generation structure are oppositely arranged, and the deformation layer is positioned between the first signal generation structure and the second signal generation structure. Since the deformation layer may be used for deformation when loading the first signal generating structure and the second signal generating structure with signals, respectively. Like this buckle the district at flexible display panel when buckling, can change along with the camber of buckling, the adjustment is to first signal generation structure and the loaded signal of second signal generation structure, so that deformation takes place for the deformation layer, thereby make the thickness change on deformation layer, so that the neutral plane of the bending zone of flexible display panel adjusts along with it, reduce the adverse effect of stress, make bending zone smooth transition, and then avoid excessively buckling the damage that causes flexible display panel, improve flexible display panel's reliability. Or, set up a plurality of main gas storage structures through the deformation district at the supporting layer, and set up the supplementary gas storage structure with main gas storage structure intercommunication, when the bending region of flexible display panel buckles, along with the curvature change of buckling, main gas storage structure stretches out and draws back in the direction of the flexible display substrate of perpendicular to, in order to discharge the gas of inside to supplementary gas storage structure, thereby make the thickness change of main gas storage structure, so that the neutral plane of the bending region of flexible display panel adjusts along with it, reduce the adverse effect of stress, make bending region smooth transition, and then avoid excessively buckling the damage that causes flexible display panel, improve flexible display panel's reliability.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A flexible display panel, comprising:
a flexible display substrate comprising: a bending zone and a flat zone; the bending area and the straight area are arranged along a first direction;
the supporting layer covers one side of the flexible display substrate; and the support layer comprises a deformation zone; the deformation area covers the bending area; the deformation area comprises a plurality of main gas storage structures which extend along the second direction and are arranged along the first direction; the second direction is different from the first direction; wherein each of the primary gas storage structures comprises: the flexible display substrate comprises an elastic top surface positioned on one side away from the flexible display substrate, a bottom surface directly contacted with the flexible display substrate, and a first side surface and a second side surface which are connected between the elastic top surface and the bottom surface; the elastic top surface, the bottom surface, the first side surface and the second side surface form a hollow structure for storing gas;
a plurality of secondary gas storage structures, one of the secondary gas storage structures in communication with one of the primary gas storage structures; and the auxiliary gas storage structure and the bending area have no overlapping area; the main gas storage structure is used for stretching in a direction perpendicular to the flexible display substrate when the bending area of the flexible display substrate is bent;
the elastic structures are adhered between every two adjacent main gas storage structures; the first side of one of the primary gas storage structures is connected to the second side of the other of the primary gas storage structures by the resilient structure.
2. The flexible display panel of claim 1, wherein a length of the elastic structure in a direction parallel to the flexible display substrate increases when the bending region of the flexible display substrate is bent.
3. The flexible display panel of claim 1, wherein the bending region has a centerline perpendicular to the first direction; the volume of the secondary gas storage structure in communication with the primary gas storage structure near the centerline is greater than the volume of the secondary gas storage structure in communication with the primary gas storage structure away from the centerline.
4. The flexible display panel of claim 3, wherein the plurality of auxiliary gas storage structures are located on a side of the flexible display substrate.
5. The flexible display panel of claim 1, wherein the flexible display substrate is bent toward the side having the supporting layer, and an amount of intake air V1 corresponding to one of the main gas storage structures satisfies the following relationship:
the flexible display substrate is bent back to one side with the supporting layer, and the air inflow V2 corresponding to one main gas storage structure meets the following relation:
wherein R1 represents a distance between a bending axis and a surface of the flexible display substrate on a side facing away from the support layer when the flexible display panel is bent, R2 represents a distance between a bending axis and a surface of the flexible display substrate on a side facing toward the support layer when the flexible display panel is bent, t represents a thickness of the main gas storage structures in a direction perpendicular to the flexible display substrate, n represents a length of a side of the main gas storage structures adjacent to the flexible display substrate in the first direction in the direction perpendicular to the flexible display substrate, and L represents a length of the main gas storage structures in the second direction.
6. A display device comprising the flexible display panel according to any one of claims 1 to 5.
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| CN112002219B (en) * | 2020-06-30 | 2023-05-23 | 联想(北京)有限公司 | Electronic equipment |
| CN112116875A (en) * | 2020-10-13 | 2020-12-22 | 武汉华星光电半导体显示技术有限公司 | Foldable display module |
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| CN114724455A (en) * | 2021-01-05 | 2022-07-08 | 元太科技工业股份有限公司 | Flexible display panel |
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| CN114300515A (en) * | 2021-12-22 | 2022-04-08 | 深圳市华星光电半导体显示技术有限公司 | Flexible display device and preparation method thereof |
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