CN112967609B - Rollable display device - Google Patents
Rollable display device Download PDFInfo
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- CN112967609B CN112967609B CN202110275881.8A CN202110275881A CN112967609B CN 112967609 B CN112967609 B CN 112967609B CN 202110275881 A CN202110275881 A CN 202110275881A CN 112967609 B CN112967609 B CN 112967609B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- 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
- G09F9/30—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
- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- 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
- G09F9/30—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
- G09F9/33—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 being semiconductor devices, e.g. diodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
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Abstract
The invention discloses a rollable display device, which belongs to the technical field of display and comprises a flexible display screen and at least one scroll; the flexible display screen comprises a curled state and a flattened state, in the curled state, the flexible display screen comprises opposite curled ends and free ends, and the flexible display screen can be wound on a reel around the curled ends; the flexible display screen is characterized by further comprising at least one stretching part positioned at the free end, wherein the stretching part can drive the flexible display screen to be unfolded under the action of external force; the stretching portion is stretchable to a degree greater than that of the flexible display screen. When the flexible display device is curled, the tensile force caused by the superposition of the thickness of the flexible display screen on the flexible display screen can be overcome as much as possible, the extrusion between film layers of the flexible display screen is reduced, and further the influence on the display quality can be avoided.
Description
Technical Field
The present invention relates to the field of display technology, and more particularly, to a rollable display device.
Background
Intelligent terminal devices (e.g., smartphones, electronic readers, tablet computers, etc.) are continually evolving towards larger display areas, i.e., larger display screens, which are lighter, thinner, and more portable. With the wide application of borderless technology, the screen ratio of the current intelligent terminal equipment, especially mobile phones, is approaching to the limit, so that a larger screen is required, and a larger carrying volume is required. Thus, the advent and use of collapsible displays, rollable displays, as a solution that can provide larger display screens and smaller carrying volumes, is a necessary consequence of market demand.
Compared with the folding mode of the display screen of the intelligent terminal equipment, the display with the crimpable function has the characteristics of high-ratio display area, easy storage and the like, and is an object of extensive research, so that the terminal crimping device has gradually become one of the development trends of future display technologies. Organic Light-Emitting Diode (OLED) display screens have the advantages of Light weight, flexibility, folding, curling and the like, and are currently used for flexible display products such as foldable mobile phones, smart watches, vehicle-mounted displays and the like. As the technology of flexible curled display screens has matured, it has become possible for intelligent terminal devices to have a curled screen in the form of a scroll.
Therefore, it is a technical problem to be solved by those skilled in the art to provide a rollable display device capable of improving the rolling effect and guaranteeing the display quality.
Disclosure of Invention
In view of the above, the present invention provides a rollable display device to improve the rolling performance and display effect of the rollable display device in the prior art.
The invention discloses a rollable display device, comprising: a flexible display screen and at least one scroll; the flexible display screen comprises a curled state and a flattened state, in the curled state, the flexible display screen comprises opposite curled ends and free ends, and the flexible display screen can be wound on a reel around the curled ends; the flexible display screen is characterized by further comprising at least one stretching part positioned at the free end, wherein the stretching part can drive the flexible display screen to be unfolded under the action of external force; the stretching portion is stretchable to a degree greater than that of the flexible display screen.
Compared with the prior art, the rollable display device provided by the invention has the advantages that at least the following beneficial effects are realized:
the flexible display device provided by the invention is wound on the reel through the flexible display screen to realize the function of curling and folding, and optionally, in a curled state, the flexible display screen comprises opposite curled ends and free ends, wherein the curled ends are ends close to the axis of the reel, the free ends are ends far away from the outer surface of the reel, and the flexible display screen can be gradually wound on the reel through winding the curled ends, namely, the free ends are positioned at one side of the curled ends far away from the axis of the reel in the curled state of the flexible display device. The flexible display device further comprises at least one stretching part positioned at the free end, wherein the stretching part is used for driving the flexible display screen to be unfolded under the action of external force (such as pulling force of a user and the like), and the flattening state of the flexible display device can be realized. The stretching part of the stretching part is more stretchable than the flexible display screen, and the stretching part at the free end has the effect of buffering stress, can bear more stretching stress as much as possible, can overcome the tensile force caused to the flexible display screen by the superposition of the thickness of the flexible display screen when the flexible display screen is curled, is beneficial to reducing the extrusion between the film layers of the flexible display screen, and further can avoid influencing the display quality.
Of course, it is not necessary for any one product to practice the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of a structure in a curled state of a rollable display device in the related art;
fig. 2 is a schematic structural view of a rollable display device in a flattened state according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a rollable display device according to an embodiment of the present invention in a rolled state;
fig. 4 is a schematic view of another structure of a rollable display device in a rolled state according to an embodiment of the present invention;
FIG. 5 is a schematic plan view of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 6 is a schematic view of the cross-sectional structure in the direction A-A' of FIG. 5;
FIG. 7 is a schematic view of a partial enlarged structure of the area B in FIG. 2;
FIG. 8 is a schematic view of another partial enlarged structure of the area B in FIG. 2;
FIG. 9 is a schematic view of another partial enlarged structure of the area B in FIG. 2;
FIG. 10 is a schematic view of another planar structure of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 11 is a schematic view showing another structure of a rollable display device in a flattened state according to an embodiment of the present invention;
FIG. 12 is a schematic view showing another structure of a rollable display device in a flattened state according to an embodiment of the present invention;
FIG. 13 is a schematic view of a partial enlarged structure of the region C in FIG. 11;
FIG. 14 is a schematic view of the partial enlarged structure of the area D in FIG. 12;
FIG. 15 is a schematic view showing another structure of a rollable display device in a flattened state according to an embodiment of the present invention;
FIG. 16 is a schematic view of a partially enlarged structure of the stretching portion in FIG. 15;
FIG. 17 is a schematic view of another partial enlarged construction of the tension section of FIG. 15;
FIG. 18 is a schematic view showing a planar structure of a supporting layer of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 19 is a schematic view showing another planar structure of a supporting layer of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 20 is a schematic plan view of a buffer layer of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 21 is a schematic view showing another planar structure of a buffer layer of a rollable display device according to an embodiment of the present invention in a flattened state;
FIG. 22 is a schematic view of another enlarged partial structure of the area B in FIG. 2;
FIG. 23 is a schematic view of another partial enlarged structure of the area B in FIG. 2;
FIG. 24 is a schematic view showing another structure of a rollable display device in a flattened state according to an embodiment of the present invention;
FIG. 25 is a schematic view showing another structure of a rollable display device in a flattened state according to an embodiment of the present invention;
fig. 26 is a schematic view showing another structure of the rollable display device in a flattened state according to the embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the related art, referring to fig. 1, fig. 1 is a schematic structural diagram of a rollable display device in the related art in a rolled state, and a flexible display screen 20 'of the rollable display device 000' in fig. 1 is rolled by a roller 20', so that the rollable display device 000' is in a flattened state and has a larger display screen when in use; when not in use, the rollable display device 000' can be rolled up on a roller to achieve a rolled state, which is convenient for storage and carrying. However, in the process of winding the rollable display device 000' from the flattened state to the rolled state by the winding shaft 20', the winding shaft 20' continuously overlaps the thickness of the flexible display 10' during rolling, so that the flexible display 10' has a tensile force F ' (as shown in fig. 1) perpendicular to the thickness overlapping direction Z ' of the flexible display, and as the number of winding turns increases, the tensile force F ' applied to the flexible display 10' also increases, and the continuous increase of the tensile force F ' is likely to cause continuous increase of stress strain accumulation, so that the film interlayer extrusion of the flexible display 10' is serious, and display failure is easily caused, thereby affecting the display performance of the device.
Referring to fig. 2 and 3 in combination, fig. 2 is a schematic structural diagram of a rollable display device in a flattened state according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a rollable display device in a rolled state according to an embodiment of the present invention, where the rollable display device 000 includes: a flexible display screen 10 and at least one reel 20; the flexible display 10 includes a rolled state (as shown in fig. 3) in which the flexible display 10 includes an opposite rolled end 10A and a free end 10B, and a flattened state (as shown in fig. 2) in which the flexible display 10 can be wound on a reel 20 around the rolled end 10A; the rollable display device 000 further includes at least one stretching portion 30 located at the free end 10B, where the stretching portion 30 can drive the flexible display screen 10 to expand under the action of external force; the stretching portion 30 is stretchable to a greater extent than the flexible display screen 10.
Specifically, the rollable display device 000 provided in this embodiment is rolled on the roller 20 through the flexible display 10 to achieve the function of being rolled and retracted, and optionally, in the rolled state, the flexible display 10 includes opposite rolled ends 10A and free ends 10B, wherein the rolled ends 10A are ends close to the axis 20A of the roller 20, the free ends 10B are ends far away from the outer surface of the roller 20, and the flexible display 10 can be rolled on the roller 20 gradually around the rolled ends 10A, i.e. the free ends 10B are located at the side of the rolled ends 10A far away from the axis 20A of the roller 20 in the rolled state of the rollable display device 000. The rollable display device 000 of the present embodiment further includes at least one stretching portion 30 located at the free end 10B, where the stretching portion 30 is configured to drive the flexible display screen 10 to expand under an external force (such as a pulling force of a user, etc.), so as to realize a flattened state of the rollable display device 000. The stretching portion 30 of the present embodiment has a stretching degree greater than that of the flexible display screen 10, and since the stretching portion 30 at the free end 10B has a stretching degree greater than that of the flexible display screen 10, the stretching portion 30 can play a role of buffering stress, and can bear more stretching stress as much as possible, so that when the flexible display device 000 is curled, the tensile force on the flexible display screen 10 caused by the superposition of the thickness of the flexible display screen 10 can be overcome as much as possible, which is beneficial to reducing the extrusion between the film layers of the flexible display screen 10, and further avoiding affecting the display quality.
It should be noted that, in this embodiment, the structure of the stretching portion 30 is not specifically limited, for example, a material with strong stretching performance may be selected to make the stretching portion 30, or a buffer structure may be disposed on the stretching portion 30 to improve the stretching capability of the stretching portion, or other disposing methods may be adopted, and in specific implementation, the stretching portion 30 may be disposed at the position of the free end 10B of the flexible display screen 10 according to actual needs, and only the stretching degree of the stretching portion 30 that is disposed needs to be satisfied to be greater than the stretching degree of the flexible display screen 10. The structure of the flexible display 10 is not limited in this embodiment, and the structure of the flexible display in the rollable display device according to the related art can be specifically understood, and the description of this embodiment is omitted.
Alternatively, as shown in fig. 4, fig. 4 is a schematic structural diagram of a curled state of the rollable display device according to the embodiment of the present invention, where the stretching portion 30 is stretchable to a greater extent than the flexible display screen 10, and the stretching portion 30 may be configured to have a wavy shape or a zigzag shape to achieve improvement of the stretching performance.
In some alternative embodiments, please refer to fig. 5 and fig. 6 in combination, fig. 5 is a schematic plan view of a rollable display device in a flattened state according to an embodiment of the present invention, fig. 6 is a schematic cross-sectional view of A-A' in fig. 5, in this embodiment, the stretching portion 30 includes a plurality of display islands 310 arranged in an array and a stretching bridge 320 connecting two adjacent display islands 310, the display islands 310 include at least one pixel unit (not shown), and the stretching bridge 320 is in a stretchable structure.
The embodiment illustrates that the stretching portion 30 located at the free end 10B of the flexible display screen 10 may be a stretchable display area, specifically, the stretching portion 30 may include a plurality of display islands 310 arranged in an array and a stretching bridge 320 connecting two adjacent display islands 310, the display islands 310 include at least one pixel unit, the stretching bridge 320 is a stretchable structure, the display islands 310 are used for providing the pixel units to realize the display function, and the stretching bridge 320 is used for realizing the stretchable function of the stretching portion 30. The display islands 310 may be of a separate structure, one end of the stretching bridge 320 is connected to one display island 310, and the other end of the stretching bridge 320 is connected to the other display island 310, so as to achieve connection of two adjacent display islands 310, i.e., two adjacent display islands 310 may be separated from each other by a gap or a notch between the two adjacent display islands 310, and the two adjacent display islands 310 separated from each other are connected through the stretching bridge 320. In this embodiment, by setting the stretching portion 30 to include a plurality of display islands 310 arranged in an array and a stretching bridge 320 connecting two adjacent display islands 310, the stretching degree of the stretching portion 30 is greater than that of the flexible display screen 10 through the stretchability of the stretching bridge 320, so that the stretching portion 30 can play a role in buffering stress in the curling process of the rollable display device 000, bear more stretching stress, and overcome the tensile force caused to the flexible display screen 10 due to the superposition of the thickness of the flexible display screen 10 as much as possible, thereby being beneficial to improving the display quality.
It should be noted that, in this embodiment, only the display island 310 includes at least one pixel unit, and the pixel unit is used to implement a display function, and in specific implementation, the structure of the display island 310 capable of implementing the display function is not limited to this, and may include other film structures, signal transmission lines, and the like, which are not described in detail herein, and the structure of the display island 310 in this embodiment may be understood with reference to the structure of the stretchable display screen in the related art.
In some alternative embodiments, please refer to fig. 2, fig. 3, fig. 7, fig. 8, fig. 7 is a schematic view of a partially enlarged structure of the region B in fig. 2, and fig. 8 is a schematic view of a partially enlarged structure of the region B in fig. 2, in which the stretching portion 30 includes a buffer layer 301; the buffer layer 301 includes a first side 301A and a second side 301B disposed opposite to each other along a direction Z perpendicular to a plane in which the flexible display screen 10 is disposed; a plurality of grooves 40 are provided on either the first side 301A or the second side 301B.
The present embodiment illustrates that the stretching portion 30 may be a single-film layer or a multi-film layer structure, where the stretching portion 30 includes a buffer layer 301, and the buffer layer 301 includes a first side 301A and a second side 301B that are disposed opposite to each other along a direction Z perpendicular to a plane in which the flexible display screen 10 is located; alternatively, in fig. 7 of the present embodiment, taking the case that the first side 301A is located on the second side 301B away from the axis 20A of the reel 20 along the direction Z perpendicular to the plane of the flexible display 10 as an example, in this embodiment, other embodiments may be used for the first side 301A and the second side 301B of the buffer layer 301 that are disposed opposite to each other. The first side 301A of the buffer layer 301 of the present embodiment is provided with a plurality of grooves 40 (as shown in fig. 7) or the second side 301B of the buffer layer 301 is provided with a plurality of grooves 40 (as shown in fig. 8), and by providing the grooves 40 on the surface or the bottom of the buffer layer 301 of the stretching portion 30, the stretching degree of the stretching portion 30 is greater than that of the flexible display screen 10, and meanwhile, the grooves 40 can deform when stretched, so that the deformation can be used as an elastic buffer structure of the stretching portion 30, thereby overcoming the tensile force caused to the flexible display screen 10 due to the superposition of the thickness of the flexible display screen 10, being beneficial to reducing the extrusion between the film layers of the flexible display screen 10 when the stretching portion 30 is pulled in the flattening process, further being beneficial to improving the display effect and avoiding the display failure.
It should be understood that, in this embodiment, the film position of the buffer layer 301 in the stretching portion 30 is not specifically limited, the buffer layer 301 may be any film made of a stretchable material in the stretching portion 30, for example, the material of the buffer layer 301 may be polyimide, polyethylene terephthalate, thermoplastic polyurethane elastomer rubber, diphenylmethane diisocyanate, toluene diisocyanate, or other materials, or the stretching degree may be improved by providing a structure capable of improving the stretching performance on the buffer layer, which is not specifically limited in this embodiment.
In some alternative embodiments, please refer to fig. 2, fig. 3 and fig. 9 in combination, fig. 9 is another enlarged partial structure schematic diagram of the region B in fig. 2, and in this embodiment, the first side 301A and the second side 301B of the buffer layer 301 are each provided with a plurality of grooves 40.
Optionally, the grooves 40 include a first groove 401 on the first side 301A and a second groove 402 on the second side 301B; the front projection of the first groove 401 on the light emitting surface of the flexible display screen 10 and the front projection of the second groove 402 on the light emitting surface of the flexible display screen 10 are staggered.
The present embodiment illustrates that the stretching portion 30 may be a single-film layer or a multi-film layer structure, where the stretching portion 30 includes a buffer layer 301, and the buffer layer 301 includes a first side 301A and a second side 301B that are disposed opposite to each other along a direction Z perpendicular to a plane in which the flexible display screen 10 is located; alternatively, in fig. 7 of the present embodiment, taking the case that the first side 301A is located on the second side 301B away from the axis 20A of the reel 20 along the direction Z perpendicular to the plane of the flexible display 10 as an example, in this embodiment, other embodiments may be used for the first side 301A and the second side 301B of the buffer layer 301 that are disposed opposite to each other. The first side 301A and the second side 301B of the buffer layer 301 in this embodiment are both provided with a plurality of grooves 40, where the grooves 40 include a first groove 401 located on the first side 301A and a second groove 402 located on the second side 301B, and the front projection of the first groove 401 on the plane where the flexible display screen 10 is located and the front projection of the second groove 402 on the plane where the flexible display screen 10 is located are staggered. According to the embodiment, the grooves 40 are formed in the surface and the bottom of the buffer layer 301 of the stretching portion 30, so that the stretching degree of the stretching portion 30 is higher than that of the flexible display screen 10, and meanwhile, the grooves 40 deform when being stretched, the deformation can be used as an elastic buffer structure of the stretching portion 30, the tensile force caused to the flexible display screen 10 due to the superposition of the thickness of the flexible display screen 10 is overcome, the extrusion between film layers of the flexible display screen 10 is reduced when the stretching portion 30 is pulled in the flattening process, the display effect is improved, display failure is avoided, the original strength of the stretching portion is maintained through the design mode of the upper and lower staggering of the first grooves 401 and the second grooves 402, the spring-like effect of the stretching portion 30 is achieved, and the stretching performance of the stretching portion 30 is improved.
In some alternative embodiments, please refer to fig. 2, fig. 3 and fig. 10 in combination, fig. 10 is a schematic plan view of another exemplary structure of a rollable display device in a flattened state according to an embodiment of the present invention, where the flexible display screen 10 includes a display area AA and a non-display area NA, and optionally, the non-display area NA is disposed around the display area AA, and the stretching portion 30 is at least located in the non-display area NA of the flexible display screen 10.
The embodiment illustrates that the stretching portion 30 located at the free end 10B of the flexible display 10 may be disposed at least within the non-display area NA of the flexible display 10, so that the stretching effect of the stretching portion 30 is prevented from being affected by a larger stretching degree when the stretching portion 30 is disposed in the display area AA.
It can be appreciated that the stretching portion 30 of the rollable display device 000 of the present embodiment may be manufactured by the same process as the flexible display screen 10, that is, in the process of manufacturing each film layer of the flexible display screen 10, the film layer with higher stretchability of the flexible display screen 10 itself may be extended to obtain the structure of the stretching portion 30 or the structure of the buffer layer 301, which is not only beneficial to ensuring the overall stability of the stretching portion 30 and the flexible display screen 10, but also beneficial to improving the manufacturing efficiency.
In some alternative embodiments, please refer to fig. 11, fig. 11 is a schematic diagram illustrating another structure of a rollable display device in a flattened state according to an embodiment of the present invention, where the flexible display screen 10 includes a flexible substrate 101, and a buffer layer 301 and the flexible substrate 101 are made of the same material.
This embodiment illustrates that the flexible display 10 may include a flexible substrate 101, which may be used as a substrate 101, and may also be used as a back plate for the rollable display device 000, for carrying the various film layer structures of the flexible display 10. Since the flexible substrate 101 has higher stretchability, the buffer layer 201 of the present embodiment may be made of the same material as the flexible substrate 101, that is, the flexible substrate 101 may be further extended along the stretching direction (such as the direction X in fig. 11) of the rollable display device 000 in the process of manufacturing the flexible display screen 10, so that the flexible display screen 10 includes a first extension portion far away from the side of the roller 20, and the first extension portion is made of the same material as the flexible substrate 101 and multiplexed into the buffer layer 301 of the stretching portion 30, so that the stretching portion 30 and the flexible substrate 101 of the flexible display screen 10 are in an integral connection structure, which is not only beneficial to ensuring the overall stability of the stretching portion 30 and the flexible display screen 10, but also beneficial to improving the manufacturing efficiency. In addition, since the flexible substrate 101 is further extended along the stretching direction of the rollable display device 000 to form the first extension portion, which is the same layer and material as the flexible substrate 101 and is multiplexed into the buffer layer 301 of the stretching portion 30, the buffer layer 301 can prevent dust from falling on the adhesive layer (which plays a role of adhesion and fixation) exposed between the film layers during the rolling, and can avoid the adhesive failure of the adhesive layer.
It can be appreciated that the flexible substrate 101 of the flexible display screen 10 of the present embodiment may further include other film layers capable of realizing the display function, such as each insulating layer, pixel definition layer, organic light emitting layer 100, etc., which are not described in detail herein, and the flexible display screen structure in the related art may be specifically referred to for understanding.
It should be noted that, in order to clearly illustrate the technical solution of the present embodiment, the thickness of each film layer of the flexible display screen 10 of the present embodiment is only illustrated to be thicker, and in practical implementation, the thickness of the film layer such as the flexible substrate 101 is far smaller than the thickness illustrated in the drawing, so that in actual use, the step difference between the first extension portion (i.e. the buffer layer 301) generated by further extending the flexible substrate 101 along the stretching direction of the rollable display device 000 and other flexible display screens 10 is not particularly obvious.
In some alternative embodiments, please refer to fig. 12, fig. 12 is a schematic view illustrating another structure of a rollable display device in a flattened state according to an embodiment of the present invention, where the flexible display screen 10 includes a flexible cover 102, and a buffer layer 301 and the flexible cover 102 are made of the same material.
The present embodiment explains that the flexible display screen 10 may include a flexible cover plate 102, and optionally, the flexible cover plate 102 is located on a side of the organic light emitting layer 100 away from the flexible substrate 101, so as to cover the organic light emitting layer 100, and function to protect the entire flexible display screen 10. Because the flexible cover 102 has higher stretchability, the buffer layer 201 of the present embodiment may be made of the same material as the flexible cover 102, i.e., the flexible cover 102 may be further extended along the stretching direction (such as the direction X in fig. 12) of the rollable display device 000 in the process of manufacturing the flexible display 10, so that the flexible display 10 includes a second extension portion far away from the side of the roller 20, and the second extension portion is made of the same material as the flexible cover 102 and multiplexed into the buffer layer 301 of the stretching portion 30, so that the stretching portion 30 and the flexible cover 102 of the flexible display 10 are integrally connected, which is not only beneficial to ensuring the overall stability of the stretching portion 30 and the flexible display 10, but also beneficial to improving the manufacturing efficiency. In addition, since the flexible cover plate 102 is further extended along the stretching direction of the rollable display device 000 to form the second extension portion, the second extension portion and the flexible cover plate 102 are made of the same material and multiplexed into the buffer layer 301 of the stretching portion 30, the buffer layer 301 can prevent dust from falling on the adhesive layer (which plays a role of adhesion and fixation) exposed between the film layers during the rolling, and can avoid the adhesive failure of the adhesive layer.
In some alternative embodiments, please refer to fig. 11, 12, 13 and 14, fig. 13 is a schematic view of a partially enlarged structure of a region C in fig. 11, and fig. 14 is a schematic view of a partially enlarged structure of a region D in fig. 12, in which, in the present embodiment, a depth H1 of the groove 40 is smaller than a thickness H2 of the buffer layer 301 along a direction Z perpendicular to a plane of the flexible display screen 10.
The present embodiment illustrates that the buffer layer 301 includes a first side 301A and a second side 301B disposed opposite each other along a direction Z perpendicular to a plane in which the flexible display screen 10 is disposed; alternatively, in fig. 13 and 14 of the present embodiment, the first side 301A is located on the second side 301B away from the axis 20A of the reel 20 along the direction Z perpendicular to the plane of the flexible display 10, and in this embodiment, other embodiments may be used for the first side 301A and the second side 301B of the buffer layer 301 that are opposite to each other. Optionally, the first side 301A and/or the second side 301B of the buffer layer 301 are provided with a groove 40, and deformation generated when the groove 40 is stretched is used as an elastic buffer structure of the stretching portion 30, so as to overcome a tensile force caused by superposition of thicknesses of the flexible display screen 10 on the flexible display screen 10. Alternatively, fig. 13 and fig. 14 each illustrate that the first side 301A and the second side 301B of the buffer layer 301 are provided with a plurality of grooves 40, where the grooves 40 include a first groove 401 located on the first side 301A and a second groove 402 located on the second side 301B, and the front projection of the first groove 401 on the plane of the flexible display screen 10 and the front projection of the second groove 402 on the plane of the flexible display screen 10 are staggered. In this embodiment, the depth H1 of the groove 40 is smaller than the thickness H2 of the buffer layer 301 along the direction Z perpendicular to the plane where the flexible display screen 10 is located, so that the groove 40 penetrates through the buffer layer 301 to affect the performance of the flexible substrate 101 or the flexible cover plate 102, and further affect the display effect of the flexible display screen 10 when the flexible substrate 101 or the flexible cover plate 102 is used as the buffer layer 301.
In some alternative embodiments, please refer to fig. 15 and fig. 16, fig. 15 is another schematic structural diagram of a curled display device in a flattened state according to an embodiment of the present invention, and fig. 16 is a schematic enlarged partial structural diagram of a stretching portion in fig. 15, in which the flexible display screen 10 includes a supporting layer 103, and a buffer layer 301 and the supporting layer 103 are made of the same material.
The embodiment explains that the flexible display screen 10 may further include a supporting layer 103, optionally, the supporting layer 103 is located on a side of the organic light emitting layer 100 away from the flexible cover plate 102, and the supporting layer 103 is located on a side of the flexible substrate 101 away from the organic light emitting layer 100, so as to support the film layer of the whole flexible display screen 10, and play a role in supporting and protecting. Optionally, the supporting layer 103 may be made of stainless steel or copper, so as to play a role in improving supporting strength, and the supporting layer 103 is provided with a plurality of hollow structures in class, so as to ensure the crimpable performance of the supporting layer 103 and realize the crimping of the flexible display screen 10. The buffer layer 201 of this embodiment may be made of the same material as the support layer 103, i.e. the support layer 103 may be further extended along the stretching direction (such as the direction X in fig. 15) of the rollable display device 000 in the process of manufacturing the flexible display screen 10, so that the flexible display screen 10 includes a third extension portion far away from one side of the roller 20, and the third extension portion is made of the same material as the support layer 103 and is reused as the buffer layer 301 of the stretching portion 30, so that the stretching portion 30 and the support layer 103 of the flexible display screen 10 are integrally connected, which is not only beneficial to ensuring the overall stability of the stretching portion 30 and the flexible display screen 10, but also beneficial to improving the manufacturing efficiency.
Optionally, as shown in fig. 15, the stretching portion 30 of the present embodiment is not only located in the non-display area NA of the flexible display 10, but the stretching portion 30 is also located in the display area AA of the flexible display 10, and the present embodiment uses the third extending portion of the supporting layer 103 further extending along the stretching direction (such as the direction X in fig. 15) of the rollable display device 000 and the supporting layer 103 originally existing in the display area AA of the flexible display 10 together as the buffer layer 301, so that the area of the buffer layer 301 is increased, and the stretching degree of the stretching portion 30 can be further increased.
In some alternative embodiments, please refer to fig. 15 and 17 in combination, fig. 17 is a schematic view of another partial enlarged structure of the stretching portion in fig. 15, and in this embodiment, the first groove 401 and the second groove 402 penetrate the buffer layer 301 along a direction Z perpendicular to the plane of the flexible display screen 10.
The present embodiment illustrates that, since the hardness of the material of the supporting layer 103 is generally greater than that of the other film layers of the flexible display screen 10 to provide a better supporting effect, when the supporting layer 103 is used as the buffer layer 301, the first groove 401 and the second groove 402 formed on the buffer layer 301 may penetrate the buffer layer 301 along the direction Z perpendicular to the plane of the flexible display screen 10. The material for manufacturing the supporting layer 103 of the flexible display screen 10 of this embodiment may be a material with higher hardness such as stainless steel or copper, so that the first groove 401 and the second groove 402 formed on the supporting layer 103 penetrate the supporting layer 103, which has less influence on the strength of the whole flexible display screen 10, and is beneficial to increasing the tensile degree, and meanwhile, the first groove 401 and the second groove 402 penetrating the buffer layer 301 are beneficial to increasing the crimpability of the supporting layer 103, which is beneficial to better realizing the crimping performance of the crimpable display device 000.
Optionally, when the first groove 401 and the second groove 402 penetrate the buffer layer 301 along the direction Z perpendicular to the plane of the flexible display 10, other film structures of the flexible display 10 except for the supporting layer 103 may cover the first groove 401 and the second groove 402, so as to ensure the adhesion firmness of the supporting layer 103 after the grooves 40 are formed.
In some alternative embodiments, please refer to fig. 18, fig. 18 is a schematic plan view of a supporting layer of a rollable display device in a flattened state according to an embodiment of the present invention, in which the stretching portion 30 is not only located in the non-display area NA of the flexible display 10, but the stretching portion 30 is also located in the display area AA of the flexible display 10, the flexible display 10 includes a supporting layer 103, and the buffer layer 301 and the supporting layer 103 are made of the same material. The first recess 401 and the second recess 402 extend through the buffer layer 301 in a direction Z perpendicular to the plane of the flexible display 10, i.e. the recess 40 extends through the buffer layer 301. The width of the groove 40 is D1 within the non-display area NA; in the display area AA, the width of the groove 40 is D2, wherein D1 is equal to or greater than D2.
The present embodiment illustrates that, because the hardness of the material of the supporting layer 103 is relatively high, when the supporting layer 103 is multiplexed as the buffer layer 103, the grooves 40 may penetrate the buffer layer 301, and the opening range of the grooves 40 may be located within the non-display area NA and the partial display area AA. Since the supporting layer 103 is provided with the grooves 40 with less influence on the display performance, the embodiment sets the intervals of the grooves 40 to be set in a sectional differentiation manner, specifically, the width of the grooves 40 is D1 in the range of the non-display area NA; in the display area AA, the width of the groove 40 is D2, where D1 is greater than or equal to D2, that is, the farther away from the reel 20 (in order to stretch the flexible display 10, the closer to the area acted by the external force), the greater the width D of the groove 40, so that enough tensile stress can be borne, when the rollable display device 000 is curled, as much as possible of the tensile force caused to the flexible display 10 due to the superposition of the thickness of the flexible display 10 can be overcome, the extrusion between the film layers of the flexible display 10 is reduced, the influence on the display quality is avoided, and in the display area AA, the smaller the width D of the groove 40 is, the curling characteristic of the rollable display device 000 can be considered, and the display quality of the display area AA is ensured.
It should be understood that, in fig. 18 of the present embodiment, the opening range of the groove 40 is only within the range of the non-display area NA and the partial display area AA, which is illustrated as an example, but the present invention is not limited thereto, and the groove 40 may be formed on the entire surface of the supporting layer 103, and may be selectively arranged according to practical requirements when implemented.
In some alternative embodiments, please refer to fig. 19, fig. 19 is a schematic view of another planar structure of the supporting layer of the rollable display device in the flattened state according to the embodiment of the present invention, in which the stretching portion 30 is not only located in the non-display area NA of the flexible display screen 10, but also the stretching portion 30 is located in the display area AA of the flexible display screen 10, the flexible display screen 10 includes the supporting layer 103, and the buffer layer 301 and the supporting layer 103 are made of the same material. The first recess 401 and the second recess 402 extend through the buffer layer 301 in a direction Z perpendicular to the plane of the flexible display 10, i.e. the recess 40 extends through the buffer layer 301. In the flattened state, the flexible display 10 includes a first end M1 near the reel 20 and a second end M2 far from the reel 20, and the width D of the groove 40 gradually decreases in a direction in which the second end M2 is directed toward the first end M1 (i.e., a direction G in fig. 19).
The present embodiment illustrates that, because the hardness of the material of the supporting layer 103 is relatively high, when the supporting layer 103 is multiplexed as the buffer layer 103, the grooves 40 may penetrate the buffer layer 301, and the opening range of the grooves 40 may be located within the non-display area NA and the partial display area AA. Because the supporting layer 103 is provided with the grooves 40, the effect of the grooves 40 on the display performance is small, and in this embodiment, the grooves 40 are arranged at intervals to perform the step-by-step differentiation, specifically, in the flattened state, the flexible display screen 10 includes the first end M1 close to the reel 20 and the second end M2 far away from the reel 20, the width D of the grooves 40 gradually decreases along the direction G of the second end M2 toward the first end M1, i.e., the further away from the reel 20, the greater the width D of the grooves 40 is, so that sufficient tensile stress can be borne, when the rollable display device 000 is curled, the tensile force caused to the flexible display screen 10 due to the superposition of the thickness of the flexible display screen 10 can be overcome as much as possible, the extrusion between the film layers of the flexible display screen 10 is reduced, the influence on the display quality is avoided, and the closer to the reel 20, the width D of the grooves 40 is gradually smaller, so that the curling characteristic of the rollable display device 000 can be considered.
Alternatively, referring to fig. 20 and 21 in combination, fig. 20 is a schematic plan view of a buffer layer of a rollable display device according to an embodiment of the present invention in a flattened state, and fig. 21 is another plan view of a buffer layer of a rollable display device according to an embodiment of the present invention in a flattened state, in this embodiment, grooves 40 formed on a buffer layer 301 of a stretching portion 30 may be shown as a single row and multiple column groove 40 with a direction X as a row direction, or may be a single row and multiple column groove 40 with a direction X as a column direction, and a direction Y is not particularly limited.
In some alternative embodiments, please refer to fig. 2, fig. 9, fig. 22, and fig. 23 in combination, fig. 22 is another partially enlarged schematic structural view of the area B in fig. 2, fig. 23 is another partially enlarged schematic structural view of the area B in fig. 2, in which the flexible display 10 includes a first cross section (not illustrated in the drawings), which may be understood as a cross section of the flexible display 10 sectioned in fig. 9, fig. 22, and fig. 23, the first cross section being perpendicular to a plane of the flexible display 10 and being parallel to a stretching direction of the rollable display device 000 (as illustrated in fig. 9, fig. 22, and fig. 23), and the first groove and/or the second groove includes any one of a square (as illustrated in fig. 9), a triangle (as illustrated in fig. 22), and a semicircle (as illustrated in fig. 23). By the diversified design of the shape of the groove 40, the stretching degree of the buffer layer 301 of the stretching portion 30 is achieved to be greater than that of the flexible display screen 10.
In some alternative embodiments, please continue to refer to fig. 2 and fig. 9, in this embodiment, along a direction Z perpendicular to a plane of the flexible display screen, a depth of the first groove 401 is equal to a depth of the second groove 402, which is H1; the spacing between adjacent two first grooves 401 in the stretching direction (direction X in fig. 9) of the rollable display device 000 is equal to the spacing between adjacent two second grooves 402, both being L1.
The present embodiment illustrates that, among the grooves 40 formed on the buffer layer 301, the depth of the first groove 401 is equal to the depth of the second groove 402 along the direction Z perpendicular to the plane of the flexible display screen, and is H1; the distance between two adjacent first grooves 401 along the stretching direction (such as the direction X in fig. 9) of the rollable display device 000 is equal to the distance between two adjacent second grooves 402, and is L1, so that the depth and the distance between the grooves 40 formed on the first side 301A and the second side 301B of the buffer layer 301 are the same, and the grooves 40 formed on the buffer layer 301 are uniformly changed, which is similar to the principle structure of a spring, and is beneficial to maintaining the force stability of the whole buffer layer 301.
In some alternative embodiments, please continue to refer to fig. 2 and 9 in combination, the thickness H2 of the buffer layer is in the range of 20-50um; the depth H1 of the first groove 401 ranges from 0.1 to 1um, and the depth H1 of the second groove 402 ranges from 0.1 to 1um; the distance L1 between two adjacent first grooves 401 ranges from 9 to 10.5um, and the distance L1 between two adjacent second grooves 402 ranges from 9 to 10.5um.
This embodiment further illustrates that the thickness H2 of the buffer layer 301 of the stretching portion 30 ranges from 20 to 50um, so that it is possible to avoid that the buffer layer 301 that is too thick cannot achieve flexible curling, and also to avoid that the buffer layer 301 that is too thin cannot open the grooves 40. The depth H1 of the first groove 401 formed on the buffer layer 301 in this embodiment ranges from 0.1 um to 1um, and the depth H1 of the second groove 402 ranges from 0.1 um to 1um; the distance L1 between two adjacent first grooves 401 ranges from 9 um to 10.5um, the distance L1 between two adjacent second grooves 402 ranges from 9 um to 10.5um, so that the grooves 40 formed in the buffer layer 301 with the thickness H2 ranging from 20 um to 50um can be stretched to a degree greater than that of the flexible display screen 10, deformation generated when the grooves 40 are stretched can be used as an elastic buffer structure of the stretching portion 30, the tensile force caused to the flexible display screen 10 due to superposition of the thickness of the flexible display screen 10 is overcome, the extrusion between film layers of the flexible display screen 10 is reduced when the stretching portion 30 is pulled in the flattening process, the display effect is improved, display failure is avoided, and the grooves 40 with overlarge density and overlarge depth formed in the buffer layer 301 are prevented from being easily broken, so that the tensile strength of the stretching portion 30 is influenced.
In some alternative embodiments, please refer to fig. 24, 25 and 26 in combination, fig. 24 is another schematic structural diagram of the rollable display device in a flattened state provided by the embodiment of the present invention, fig. 25 is another schematic structural diagram of the rollable display device in a flattened state provided by the embodiment of the present invention, fig. 26 is another schematic structural diagram of the rollable display device in a flattened state provided by the embodiment of the present invention, in this embodiment, the flexible substrate 101 of the flexible display screen 10 and the organic light emitting layer 100 are adhered and fixed by the first adhesive layer 104 (as shown in fig. 24), the flexible cover plate 102 and the organic light emitting layer 100 are adhered and fixed by the second adhesive layer 105 (as shown in fig. 25), the supporting layer 103 and the flexible substrate 101 are adhered and fixed by the third adhesive layer 106 (as shown in fig. 26), and the two ends of the first adhesive layer 104, the second adhesive layer 105 and the third adhesive layer 106 have end portions K, respectively, which may be inclined surfaces, along the stretching direction X of the rollable display device 000. Because the flexible display screen 10 is easy to generate small dislocation between the film layers due to winding extrusion in the process of winding on the reel 20, two film layers with inclined surfaces at two end surfaces of the first adhesive layer 104 and the second adhesive layer 105, which can be better adhered and fixed in dislocation, are arranged.
In this embodiment, the inclination angles of the inclined surfaces of the two end portions K of the first adhesive layer 104 and the second adhesive layer 105 are not particularly limited, and may be selected according to the thickness of the adhesive layer, the thickness of the two adhesive layers, and the degree of curling.
According to the embodiment, the rollable display device provided by the invention has at least the following beneficial effects:
the flexible display device provided by the invention is wound on the reel through the flexible display screen to realize the function of curling and folding, and optionally, in a curled state, the flexible display screen comprises opposite curled ends and free ends, wherein the curled ends are ends close to the axis of the reel, the free ends are ends far away from the outer surface of the reel, and the flexible display screen can be gradually wound on the reel through winding the curled ends, namely, the free ends are positioned at one side of the curled ends far away from the axis of the reel in the curled state of the flexible display device. The flexible display device further comprises at least one stretching part positioned at the free end, wherein the stretching part is used for driving the flexible display screen to be unfolded under the action of external force (such as pulling force of a user and the like), and the flattening state of the flexible display device can be realized. The stretching part of the stretching part is more stretchable than the flexible display screen, and the stretching part at the free end has the effect of buffering stress, can bear more stretching stress as much as possible, can overcome the tensile force caused to the flexible display screen by the superposition of the thickness of the flexible display screen when the flexible display screen is curled, is beneficial to reducing the extrusion between the film layers of the flexible display screen, and further can avoid influencing the display quality.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. A rollable display device, comprising: a flexible display screen and at least one scroll; the flexible display screen includes a rolled state in which the flexible display screen includes opposite rolled ends and free ends, the flexible display screen being capable of being wound on the reel around the rolled ends; the flexible display screen is characterized by further comprising at least one stretching part positioned at the free end, wherein the stretching part can drive the flexible display screen to be unfolded under the action of external force; the stretching part has a stretching degree larger than that of the flexible display screen;
the stretching part comprises a buffer layer; the buffer layer comprises a first side and a second side which are oppositely arranged along the direction perpendicular to the plane of the flexible display screen;
The first side and the second side are provided with a plurality of grooves;
the grooves include a first groove on the first side and a second groove on the second side; the orthographic projection of the first groove on the light-emitting surface of the flexible display screen and the orthographic projection of the second groove on the light-emitting surface of the flexible display screen are arranged in a staggered mode;
the flexible display screen comprises a display area and a non-display area;
the stretching part is positioned in the non-display area of the flexible display screen;
the stretching part is also positioned in the display area of the flexible display screen, the flexible display screen comprises a supporting layer, and the buffer layer and the supporting layer are made of the same material.
2. The rollable display device according to claim 1, wherein,
and the depth of the groove is smaller than the thickness of the buffer layer along the direction perpendicular to the plane of the flexible display screen.
3. The rollable display device of claim 1, wherein the first and second grooves extend through the buffer layer in a direction perpendicular to a plane in which the flexible display screen is located.
4. The rollable display device according to claim 1, wherein,
The width of the groove is D1 in the range of the non-display area;
in the display area range, the width of the groove is D2, wherein D1 is more than or equal to D2.
5. The rollable display device of claim 1, wherein in the flattened state the flexible display screen includes a first end proximate to the roller and a second end distal from the roller, the width of the groove gradually decreasing in a direction along the second end toward the first end.
6. The rollable display device according to claim 1, wherein,
the depth of the first groove is equal to the depth of the second groove along the direction perpendicular to the plane of the flexible display screen;
the distance between two adjacent first grooves is equal to the distance between two adjacent second grooves.
7. The rollable display device according to claim 1, wherein,
the thickness of the buffer layer ranges from 20 um to 50um;
the depth range of the first groove is 0.1-1um, and the depth range of the second groove is 0.1-1um;
the distance between two adjacent first grooves is 9-10.5um, and the distance between two adjacent second grooves is 9-10.5um.
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| CN113345330B (en) * | 2021-06-17 | 2022-10-04 | 合肥维信诺科技有限公司 | Flexible display device |
| KR20230000277A (en) * | 2021-06-24 | 2023-01-02 | 삼성전자주식회사 | Flexible display and electronic device having thereof |
| CN113506516A (en) * | 2021-07-19 | 2021-10-15 | 武汉华星光电半导体显示技术有限公司 | Stretchable display panel and electronic device |
| CN114578906B (en) * | 2022-03-16 | 2024-08-27 | 上海天马微电子有限公司 | Display device |
| CN114863809B (en) * | 2022-04-15 | 2023-11-17 | 京东方科技集团股份有限公司 | Flexible display module and display device |
| CN115132096B (en) * | 2022-07-29 | 2023-09-08 | 珠海华萃科技有限公司 | Flexible screen assembly and electronic equipment |
| KR20240086304A (en) * | 2022-12-09 | 2024-06-18 | 엘지디스플레이 주식회사 | Display device |
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