CN107067979B - Flexible display device, manufacturing method thereof and electronic equipment - Google Patents
Flexible display device, manufacturing method thereof and electronic equipment Download PDFInfo
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- CN107067979B CN107067979B CN201710134929.7A CN201710134929A CN107067979B CN 107067979 B CN107067979 B CN 107067979B CN 201710134929 A CN201710134929 A CN 201710134929A CN 107067979 B CN107067979 B CN 107067979B
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- 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
Abstract
The embodiment of the invention discloses a flexible display device, a manufacturing method thereof and electronic equipment. The flexible display device includes: a flexible display panel having a first side surface displaying an image and a second side surface opposite to the first side surface; the buffer film is at least formed on the second side surface of the flexible display panel and provided with a second buffer area and a first buffer area surrounding the second buffer area, wherein a plurality of hollow structures are arranged in the buffer film of the first buffer area, and when the flexible display panel is in a planar state, the cross section area of each hollow structure along the second direction parallel to the flexible display panel is gradually increased to a preset area and then gradually reduced in the first direction perpendicular to the flexible display panel. In the embodiment of the invention, the buffer film can prevent the flexible display panel from collapsing or twisting, limit the bending curvature of the panel, improve the impact resistance and the shock absorption capability of the panel and realize the moisture-proof function.
Description
Technical Field
The embodiment of the invention relates to the field of flexible display, in particular to a flexible display device, a manufacturing method thereof and electronic equipment.
Background
The flexible display is a display device which is made of soft materials and can be deformed and bent, and the flexible display is one of future technical trends and can be used for realizing random rolling and folding of display equipment such as smart phones and flat panels. However, for flexible displays, there are generally the following problems: when the flexible display screen is stretched, the middle part of the screen may collapse, the surface of the screen may be uneven, the screen may be distorted and the like due to the fact that the flexible display screen is softer; the impact resistance and shock absorption capacity of the flexible display screen are not enough; when the flexible display screen is bent and deformed, an excessive bending phenomenon may occur to cause damage to devices inside the display screen. The above problems have a great influence on the user experience and the service life of the flexible display, and become a difficult problem to be solved urgently for the industrial application of the flexible display.
Disclosure of Invention
The embodiment of the invention provides a flexible display device, a manufacturing method thereof and electronic equipment, and aims to solve the problems that an existing flexible display screen is prone to collapse, unevenness, distortion and the like, poor in shock resistance and shock absorption capacity, excessive in bending and the like.
In a first aspect, an embodiment of the present invention provides a flexible display device, including:
a flexible display panel having a first side surface displaying an image and a second side surface opposite to the first side surface;
at least one deck buffer film, buffer film forms at least on the second side surface of flexible display panel, buffer film has the second buffer zone and centers on the first buffer zone of second buffer zone, wherein, be provided with a plurality of hollow structure in the buffer film of first buffer zone, work as when flexible display panel is in planar state, at the perpendicular to flexible display panel's first direction, hollow structure's edge is on a parallel with the cross sectional area of flexible display panel's second direction increases gradually to predetermineeing the area and then reduces gradually again.
In a second aspect, the embodiment of the present invention further provides an electronic device, which includes the flexible display apparatus as described above.
In a third aspect, an embodiment of the present invention further provides a manufacturing method of a flexible display device, where the manufacturing method includes:
providing at least two buffer thin layers, wherein each buffer thin layer is provided with a second buffer area and a first buffer area surrounding the second buffer area, and a plurality of grooves are formed in the first buffer area;
attaching one buffer thin layer to the other buffer thin layer to enable the grooves of the two buffer thin layers to be correspondingly overlapped one by one to form a buffer film with a plurality of hollow structures;
providing a flexible display panel, wherein the flexible display panel is provided with a first side surface for displaying images and a second side surface opposite to the first side surface, and attaching the buffer film to the second side surface of the flexible display panel, wherein the buffer film at least covers the second side surface of the flexible display panel;
when the flexible display panel is in a planar state, in a first direction perpendicular to the flexible display panel, the cross-sectional area of the hollow structure along a second direction parallel to the flexible display panel is gradually increased to a preset area and then gradually decreased.
In the flexible display device provided by the embodiment of the invention, at least one layer of buffer film is formed on the second side surface of the flexible display panel, a plurality of hollow structures are arranged in the buffer film of the first buffer area, and when the flexible display panel is in a planar state, the cross section area of each hollow structure along the second direction is gradually increased to a preset area and then gradually reduced in the first direction. The flexible display device provided by the embodiment of the invention can avoid the problems of screen middle part collapse, screen surface unevenness, screen distortion and the like of the flexible display panel; the buffer film is used as an integral film layer, the bending curvature of the flexible display panel can be limited, the bending resistance of the flexible display panel is improved, and the phenomenon of over-bending is prevented; meanwhile, the buffer membrane with the hollow structure can realize the buffer effect, absorb impact force and vibration, and improve the impact resistance and the vibration absorption capacity of the flexible display panel; and, the second side surface of buffer film parcel flexible display panel, then the buffer film can play shielding and block outside water oxygen effect, prevents that outside water oxygen from getting into flexible display panel from flexible display panel's second side surface, has realized dampproofing function.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a flexible display device provided in the prior art;
FIG. 2A is a schematic diagram of a support structure for a flexible display provided in the prior art;
FIG. 2B is a cross-sectional view taken along A-A' of FIG. 2A;
fig. 3A is a schematic diagram of a flexible display device according to an embodiment of the present invention;
FIG. 3B is one possible implementation of the cross-sectional view of FIG. 3A along B-B';
FIG. 3C is yet another possible implementation of the cross-sectional view of FIG. 3A along B-B';
FIG. 4A is a schematic diagram of a prior art flexible display screen before and after an impact shock;
fig. 4B is a schematic diagram illustrating a change of the flexible display device without the hollow structure before and after an impact shock;
fig. 4C is a schematic view illustrating a change of the flexible display device having a hollow structure before and after an impact shock;
fig. 5 is a schematic view of a flexible display device having a hollow structure for blocking external water and oxygen according to an embodiment of the present invention;
fig. 6A is a schematic view of another flexible display device provided in an embodiment of the present invention;
FIG. 6B is a cross-sectional view taken along C-C' of FIG. 6A;
fig. 7A is a schematic view of a flexible display device according to another embodiment of the present invention;
FIG. 7B is a cross-sectional view taken along D-D' of FIG. 7A;
fig. 8 is a schematic view of still another flexible display device provided by an embodiment of the present invention;
fig. 9A to 9E are schematic diagrams of various realizations of a flexible display device according to an embodiment of the present invention;
fig. 10 is a flowchart of a method of manufacturing a flexible display device according to another embodiment of the present invention;
fig. 11A to 11C are schematic diagrams illustrating steps in a manufacturing process of a flexible display device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a flexible display device provided in the prior art, which is a roll type flexible display device, and in particular, the flexible display device includes a flexible display screen and a rolling device for supporting the flexible display screen, and a flexible display screen 10 is drawn out of an opening 20 of the flexible display device and retracted. Fig. 2A is a cross-sectional view taken along a-a 'of fig. 2A, in which the support structure 30 is disposed on a non-display area of the flexible display 40, and fig. 2B is a cross-sectional view taken along a-a' of fig. 2A, the support structure 30 includes a plurality of bosses 31 having a narrow top and a wide bottom, so that the flexible display 40 has a bending limit when bent.
However, for the existing flexible display screen, when the flexible display screen is stretched, the flexible display screen is soft, and the phenomena of collapse of the middle part of the screen, uneven surface of the screen, distortion of the screen and the like may occur; the impact resistance and shock absorption capacity of the flexible display screen are not enough, and the like, so that the user experience and the service life of the flexible display are seriously influenced.
Please refer to fig. 3A, 3B and 3C. Fig. 3A is a schematic diagram of a flexible display device according to an embodiment of the present invention, fig. 3B is a possible implementation manner of a cross-sectional view taken along B-B 'of fig. 3A, and fig. 3C is another possible implementation manner of the cross-sectional view taken along B-B' of fig. 3A. The flexible display device provided by the embodiment of the application specifically comprises the following structures: a flexible display panel 110, the flexible display panel 110 having a first side surface 111 displaying an image and a second side surface opposite to the first side surface 111; the at least one buffer film 120, the buffer film 120 being formed at least on the second side surface of the flexible display panel 110, the buffer film 120 having a second buffer region 122 and a first buffer region 121 surrounding the second buffer region 122, wherein a plurality of hollow structures 123 are disposed in the buffer film 120 of the first buffer region 121, and when the flexible display panel 110 is in a planar state, in a first direction perpendicular to the flexible display panel 110, a cross-sectional area of the hollow structures 123 along a second direction parallel to the flexible display panel 110 gradually increases to a predetermined area and then gradually decreases.
The flexible display panel 110 described in this embodiment is any one of the existing flexible display panels manufactured based on a flexible material, such as an AMOLED flexible display panel, and the flexible display panel is not particularly limited in the present invention. Fig. 3A shows a flexible display device, which optionally includes a layer of buffer film 120, and the optional buffer film 120 is only disposed on the second side surface of the flexible display panel 110 (the second side surface is in direct contact with the buffer film 120 and is covered by the buffer film 120, and the mark is not shown).
As shown in fig. 3A, the flexible display panel 110 of the flexible display device has a first side surface 111 displaying an image and a second side surface opposite to the first side surface 111, and light is emitted from the first side surface 111 of the flexible display panel 110 to display an image. It will be understood by those skilled in the art that in other alternative embodiments, the flexible display panel may be in a dual-side light emitting mode, that is, light is emitted from the first side surface of the flexible display panel to display an image while light is emitted from the second side surface of the flexible display panel to display an image, and the light emitting mode of the flexible display panel is not particularly limited in the present invention.
As shown in fig. 3A, the buffer film 120 of the flexible display device is formed on the second side surface of the flexible display panel 110, and the buffer film 120 is in direct contact with the second side surface of the flexible display panel 110 and completely covers the second side surface of the flexible display panel 110, so that the buffer film 120 can entirely support the flexible display panel 110. When the flexible display panel 110 is in a planar state, the buffer film 120 can improve the rigidity of the flexible display panel 110, thereby avoiding the problems of the flexible display panel 110, such as the middle portion of the screen collapsing, the surface of the screen being uneven, and the screen being twisted. When the flexible display panel 110 is bent, the buffer film 120 serves as an integral film layer, which can limit the bending curvature of the flexible display panel 110, increase the bending resistance of the flexible display panel 110, and prevent the damage of the devices inside the flexible display panel 110 due to the over-bending phenomenon.
As shown in fig. 3B, the buffer film 120 has a second buffer region 122 and a first buffer region 121 surrounding the second buffer region 122, and a plurality of hollow structures 123 are disposed in the buffer film 120 of the first buffer region 121, that is, the outer surface of the buffer film 120 is a complete film layer, and the interior of the buffer film 120 has at least one hollow structure 123. Obviously, the position, size and number of the hollow structures 123 are related to the size of the buffer membrane 120, and the related designer can design the position, size and number of the hollow structures according to the size parameters of the buffer membrane in the product, and is not particularly limited in the present invention.
It should be noted that, a plurality of hollow structures may be distributed in the buffer film of the first buffer area in a uniform or non-uniform arrangement. In the present embodiment, a plurality of hollow structures 123 may be distributed in the buffer film 120 of the first buffer area 121 in a uniform arrangement, and the uniform arrangement of the hollow structures 123 may achieve uniform bending curvature.
As shown in fig. 3B, when the flexible display panel 110 is in a planar state, in the first direction, the cross-sectional area of the hollow structure 123 along the second direction gradually increases to a preset area and then gradually decreases, based on the area characteristics of the hollow structure 123, the optional hollow structure 123 shown in fig. 3B is a pyramid (octahedron or hexahedron), and a connection line of upper and lower vertex angles of the pyramid is parallel to the first direction. Specifically, taking three cross sections a1, a2, A3 of the pyramid shown in fig. 3B along the second direction as an example, the cross section a1 is close to the upper vertex angle of the pyramid in the first direction and the area of the cross section a1 is S1, the cross section a2 is located at the middle of the pyramid in the first direction and the area of the cross section a2 is S2, the cross section A3 is close to the lower vertex angle of the pyramid in the first direction and the area of the cross section A3 is S3, wherein the preset area of the pyramid is the area S2 of the cross section a 2. As is apparent from S1< S2 and S2> S3, the cross-sectional area of the pyramid in the second direction gradually increases from 0 to S1 and then gradually increases to S2, and then gradually decreases from S2 to S3 and then gradually decreases to 0, that is, the cross-sectional area of the pyramid in the first direction in the second direction gradually increases from small to large and then decreases, and the structure of the pyramid conforms to the characteristic that the cross-sectional area of the hollow structure 123 in the second direction gradually increases to a predetermined area and then gradually decreases. When the hollow structure 123 is a pyramid, the cross-sectional shape of the hollow structure 123 in the first direction is a diamond shape.
In order to clearly illustrate the characteristics of the hollow structure of the buffer film of the present invention, another flexible display device having a top view as shown in fig. 3A and a cross-sectional view as shown in fig. 3C is provided in this embodiment, and the flexible display device is different from the flexible display device shown in fig. 3B in that the hollow structure 123 of the flexible display device shown in fig. 3C is an ellipsoid, and a line connecting the top and the bottom of the ellipsoid is parallel to the first direction. Specifically, taking five cross-sections a1, a2, A3, A4, A5 of the ellipsoid shown in fig. 3C along the second direction as an example, the cross-section a1 is close to the top of the ellipsoid in the first direction and the area of the cross-section a1 is S1, the cross-section A3 is located in the middle of the ellipsoid in the first direction and the area of the cross-section A3 is S3, the cross-section A5 is close to the bottom of the ellipsoid in the first direction and the area of the cross-section A5 is S5, the cross-section a2 is located between the cross-sections a1 and A3 in the first direction and the area of the cross-section a2 is S2, and the cross-section A4 is located between the cross-sections A5 and A3 in the first direction and the area of the cross-section A3 is S3, wherein the predetermined area of the ellipsoid is the area S3. As is apparent from S1< S2< S3 and S3> S4> S5, the cross-sectional area of the ellipsoid along the second direction gradually increases from 0 to S1, then gradually increases to S2, then gradually increases to S3, then gradually decreases from S3 to S4, then gradually decreases to S5, and then gradually decreases to 0, that is, the cross-sectional area of the ellipsoid along the second direction in the first direction gradually increases to a larger area and then decreases to a smaller area, and the structure of the ellipsoid conforms to the characteristic that the cross-sectional area of the hollow structure 123 along the second direction gradually increases to a predetermined area and then decreases. When the hollow structure 123 is an ellipsoid, the sectional shape of the hollow structure 123 in the first direction is an ellipse.
The skilled person in the art can understand that the size and the preset area of the hollow structure are limited by the size of the buffer membrane, and related designers can design the position, the preset area, the size and the number of the hollow structure according to the size parameter of the buffer membrane in the product, so that the preset areas of different hollow structures can be changed according to the product design, and the preset area of the hollow structure is not specifically limited in the invention; the structural shape of the hollow structure in the present invention includes, but is not limited to, the above-mentioned pyramid and ellipsoid, and any structure in which the cross-sectional area along the second direction gradually increases to a predetermined area and then gradually decreases falls within the scope of the hollow structure in the present invention, such as a sphere, a hexagonal prism, and the like.
The buffer film 120 having the hollow structure 123 in this embodiment is disposed on the second side surface of the flexible display panel 110 and also can achieve buffering, impact resistance, and vibration resistance functions. The excellent buffering, impact resistance and vibration effects of the buffer film 120 having the hollow structure 123 in the present embodiment will be described herein with respect to the changes before and after impact vibration of the conventional flexible display panel having the support structure, the flexible display device without the hollow structure, and the flexible display device having the hollow structure, respectively.
Next, the impact shock resistance of the flexible display device provided in the embodiment of the present application will be explained with reference to fig. 4A to 4C. As shown in fig. 4A, which is a schematic view of a change of the conventional flexible display screen 40 before and after an impact shock, it is obvious that the supporting structure 30 provided on the conventional flexible display screen 40 does not change before and after the impact shock, and the height thereof is always kept at X1, so that the supporting structure 30 can only play a supporting role, cannot play a buffering role, and cannot absorb the impact shock received by the flexible display screen 110, and the conventional flexible display screen 110 is easily damaged when receiving the impact shock.
Fig. 4B is a schematic diagram showing the change of the flexible display device without the hollow structure before and after the impact shock. When the flexible display panel 50 is not impacted and vibrated, the film thickness of the buffer film 60 is H1. When the flexible display panel 50 is impacted and vibrated, the buffer film 60 is also subjected to external forces such as impact and vibration, based on the buffer characteristics of the buffer material, the buffer film 60 is compressed and deformed in the first direction, that is, the film thickness of the buffer film 60 is changed to H2 and H2< H1, and the buffer film 60 has a buffer function. When the external force is removed, the cushioning properties of the buffer film 60 restore the film thickness to H1. The buffer film 60 can perform a buffering function, thereby improving impact resistance and shock absorption of the flexible display panel 50. However, the buffer film 60 is a dense film layer, and the thickness H2 is only slightly less than H1 when deformed, so the buffer effect of the buffer film 60 is slightly better than that of the prior art.
Fig. 4C is a schematic diagram illustrating a change of the flexible display device having a hollow structure before and after an impact shock. When the flexible display panel 110 is not impacted and vibrated, the film thickness of the buffer film 120 is H1, the height of the hollow structure 123 is G1, and the width is W1. When the flexible display panel 110 is impacted and vibrated, the buffer film 120 is also subjected to external forces such as impact and vibration, based on the material buffer characteristics of the buffer film and the hollow structure 123 arranged therein, the buffer film 120 is subjected to compression deformation in the first direction, namely, the film thickness of the buffer film 120 is changed to H3 and H3< H2< H1, and simultaneously, the hollow structure 123 of the buffer film 120 is subjected to compression deformation in the first direction, namely, the height of the buffer film is changed to G2 and G2< G1, and based on the compression deformation of the buffer film 120 and the hollow structure 123 in the first direction, the hollow structure 123 of the buffer film 120 is also subjected to tensile deformation in the second direction, namely, the width of the hollow structure is changed to W2 and W2> W1; based on the cross-sectional area of the hollow structure 123 along the second direction parallel to the flexible display panel 110, the cross-sectional area increases from small to large to small, when the hollow structure 123 deforms, an interaction internal force can be generated between any adjacent side walls of the hollow structure 123, so that the supporting effect is achieved, the effect of resisting an external force is achieved, the buffer film 120 is not damaged, obviously, the deformation of the buffer film 120 and the hollow structure 123 is a process of absorbing impact shock, and therefore the flexible display panel 110 can be effectively prevented from being damaged by the impact shock. When the external force disappears, the internal force of the interaction generated between any adjacent side walls of the hollow structure 123 can restore the position after the deformation to the position before the deformation, that is, the film thickness of the buffer film 120 is H1, the height of the hollow structure 123 is G1, and the width is W1. Therefore, the buffer film 120 having the hollow structure 123 can achieve a buffering effect, absorb impact force and shock, and further improve the impact resistance and shock absorption capability of the flexible display panel 110, and the effect of buffering and absorbing impact force and shock of the buffer film 120 is better than that of the flexible display device provided in fig. 4A and 4B.
In addition, because the second side surface of the flexible display panel 110 is wrapped by the buffer film 120, the buffer film 120 can additionally play a role in shielding and blocking external water and oxygen while playing a role in buffering, absorbing impact force and vibration, so that the external water and oxygen are prevented from entering the flexible display panel 110 from the second side surface of the flexible display panel 110, and a moisture-proof function is realized. As shown in fig. 5, when water and oxygen impurities exist outside, the shielding and blocking effects of the buffer film 120 can block most of the water and oxygen impurities outside the buffer film 120; a small amount of water and oxygen impurities may enter the buffer film 120, wherein a portion of the water and oxygen impurities may be dissolved in the buffer film 120 when moving in the buffer film 120, another portion of the water and oxygen impurities may be dissolved in the air of the hollow structure 123 when moving into the hollow structure 123 of the buffer film 120, and the remaining very small amount of the water and oxygen impurities may move to the second side surface of the flexible display panel 110. Obviously, the buffer film 120 with the hollow structure 123 can play a role in effectively blocking water and oxygen impurities while playing a role in buffering, absorbing impact force and vibration, thereby greatly reducing the water and oxygen impurities entering the second side surface of the flexible display panel 110.
The flexible display device provided by the embodiment is characterized in that at least one layer of buffer film is formed on the second side surface of the flexible display panel, a plurality of hollow structures are arranged in the buffer film of the first buffer area, and when the flexible display panel is in a planar state, the cross section area of each hollow structure along the second direction is gradually increased to a preset area and then gradually reduced in the first direction. According to the flexible display device provided by the embodiment, the buffer film can improve the rigidity of the flexible display panel, and the problems of screen middle part collapse, screen surface unevenness, screen distortion and the like of the flexible display panel are avoided; the buffer film is used as an integral film layer, the bending curvature of the flexible display panel can be limited, the bending resistance of the flexible display panel is improved, and the phenomenon of over-bending is prevented; the buffer film with the hollow structure can realize the buffer effect, absorb impact force and vibration, and improve the impact resistance and the vibration absorption capacity of the flexible display panel; and, the second side surface of buffer film parcel flexible display panel, then the buffer film can play shielding and block outside water oxygen effect, prevents that outside water oxygen from getting into flexible display panel from flexible display panel's second side surface, has realized dampproofing function. The flexible display device provided by the embodiment has the advantages of long service life and good user experience.
Fig. 6A is a schematic diagram of another flexible display device according to an embodiment of the present invention, and fig. 6B is a cross-sectional view taken along line C-C' of fig. 6A, where the flexible display device has the same reference numerals as those of the flexible display device. The flexible display device is different from any one of the flexible display devices described above in that the buffer film 120 of the second buffer area 122 is located on the second side surface of the flexible display panel 110, and the buffer film 120 of the first buffer area 121 surrounds the flexible display panel 110 and directly contacts an edge sidewall of the flexible display panel 110. The flexible display device includes at least one buffer film 120, and only the case where the flexible display device includes one buffer film 120 is illustrated herein. The buffer film 120 of the first buffer area 121 has a hollow structure 123 therein, and the buffer film 120 of the second buffer area 122 does not have a hollow structure therein.
In the flexible display device, the buffer film 120 of the second buffer area 122 is located on the second side surface of the flexible display panel 110, and the buffer film 120 of the second buffer area 122 can improve the rigidity of the flexible display panel 110, thereby avoiding the problems of the flexible display panel 110, such as the collapse of the middle part of the screen, the uneven surface of the screen, the distortion of the screen, and the like; the buffer film 120 of the second buffer area 122 entirely covers the flexible display panel 110, so the buffer film 120 can also limit the bending curvature of the flexible display panel 110, increase the bending resistance of the flexible display panel 110, and prevent the occurrence of an over-bending phenomenon.
In the flexible display device, the buffer film 120 of the first buffer area 121 surrounds the flexible display panel 110 and directly contacts the edge sidewall of the flexible display panel 110, and the buffer film 120 of the first buffer area 121 has the hollow structure 123 therein, so that the buffer film 120 can achieve excellent effects of buffering and absorbing impact force and vibration, and the impact resistance and the vibration absorption capability of the flexible display panel 110 are effectively improved; and, the buffer film 120 can also protect the second side surface of the flexible display panel 110 and the sidewalls thereof, preventing the second side surface and the edge sidewalls of the flexible display panel 110 from being damaged.
In the flexible display device, the buffer film 120 wraps the second side surface of the flexible display panel 110 and the edge side wall of the flexible display panel, and the buffer film 120 of the second buffer area 122 can additionally play a role in shielding and blocking external water and oxygen while playing buffering, absorbing impact force and vibration effects, so that the external water and oxygen are prevented from entering the flexible display panel 110 from the second side surface of the flexible display panel 110, and a moisture-proof function is realized. The buffer film 120 of the first buffer area 121 can additionally play a role of shielding and blocking external water and oxygen while playing a role of buffering, absorbing impact force and vibration, so as to prevent the external water and oxygen from entering the flexible display panel 110 from the edge sidewall of the flexible display panel 110, thereby realizing a moisture-proof function. The buffer film 120 of the flexible display device greatly reduces water and oxygen impurities entering the flexible display panel 110, and the water and oxygen blocking effect of the flexible display device is better than that of any flexible display device.
Fig. 7A is a schematic diagram of another flexible display device according to an embodiment of the present invention, and fig. 7B is a cross-sectional view taken along line D-D' of fig. 7A, where the flexible display device has the same reference numerals as those of the flexible display device. The flexible display device is different from any one of the flexible display devices in that the buffer film 120 is only disposed on the second side surface of the flexible display panel 110, and the thickness of the buffer film 120 in the first buffer region 121 is greater than that of the buffer film 120 in the second buffer region 122, that is, the buffer film 120 has a structure in which the frame region is thick and the middle region is thin.
In the flexible display device, the buffer film 120 can improve the rigidity of the flexible display panel 110, and avoid the problems of the flexible display panel 110, such as the collapse of the middle part of the screen, the uneven surface of the screen, the distortion of the screen and the like; the buffer film 120 can also limit the bending curvature of the flexible display panel 110, increase the bending resistance of the flexible display panel 110, and prevent the over-bending phenomenon; the buffer film 120 with the hollow structure 123 can also achieve a buffering effect, absorb impact force and shock, and improve the impact resistance and shock absorption capability of the flexible display panel 110; and, the buffer film 120 wraps at least the second side surface of the flexible display panel 110, and can also play a role in shielding and blocking external water and oxygen, thereby greatly reducing water and oxygen impurities entering the flexible display panel 110, and realizing a moisture-proof function.
In the flexible display device, the thickness of the buffer film 120 of the first buffer area 121 is greater than the thickness of the buffer film 120 of the second buffer area 122. If a first buffer film is provided, the thickness of the first buffer film is uniform and is the same as that of the buffer film in the first buffer area; providing a second buffer film with uniform thickness and the same thickness as the second buffer region, wherein the curvature of the first buffer film is smaller than that of the second buffer film. Therefore, in the flexible display device, the buffer film 120 of the first buffer area 121 limits the bending curvature of the flexible display device to be small, and prevents the phenomenon of excessive bending caused by excessive bending curvature.
The flexible display device comprises at least one layer of buffer film, the thickness of an optional layer of buffer film is 0.1-0.2 mm, and the number of layers of the optional buffer film is 1-3, so that the buffer film does not affect the bending performance of the flexible display panel on the basis of realizing the buffer function. In other alternative embodiments of the flexible display device, a plurality of buffer films may be optionally included, and are not particularly limited in the present invention.
It will be understood by those skilled in the art that in other alternative embodiments, the buffer film may also be formed on the second side surface of the flexible display panel, and at the same time, the buffer film is also formed on the non-display area of the first side surface of the flexible display panel, and it is obvious that the present invention is not limited to the film layer structure of the buffer film on the basis of not affecting the image display of the flexible display panel.
Illustratively, on the basis of any one of the flexible display devices described above, the sum of the volumes of the plurality of selectable hollow structures is less than or equal to one half of the volume of the buffer film of the first buffer region. The buffer membrane has strong impact resistance and shock absorption capacity, and if the sum of the volumes of the plurality of hollow structures exceeds one half of the volume of the buffer membrane in the first buffer area, the hollow structures are easy to collapse. Specifically, when the flexible display panel is impacted or vibrated, the buffer membrane is too large in hollow area and possibly poor in buffer capacity, and the hollow structure collapses, so that the buffer function cannot be exerted.
For example, on the basis of any one of the above-mentioned flexible display devices, as shown in fig. 8, a plurality of hollow structures are disposed in the buffer film of the optional second buffer region, and the sum of the volumes of the plurality of hollow structures is less than or equal to half of the volume of the buffer film of the second buffer region, taking the flexible display device shown in fig. 3A as an example, and fig. 8 is another cross-sectional view taken along B-B' of fig. 3A. Hollow structures can be arranged in the first buffer area and the second buffer area of the buffer membrane, so that the impact resistance and the shock absorption capacity of the buffer membrane can be improved. The buffer film of the optional second buffer region is provided with a plurality of regularly arranged hollow structures, and if the hollow structures are irregularly arranged, the buffer effect and the bending curvature of the buffer film may be uneven, but the invention is not limited thereto.
It will be understood by those skilled in the art that the size, arrangement, shape, etc. of the hollow structures in the buffer film of the second buffer region may be the same as or different from the hollow structures in the buffer film of the first buffer region, and related practitioners may set the relevant parameters of the hollow structures in the buffer film of the first buffer region and the relevant parameters of the hollow structures in the buffer film of the second buffer region according to production needs, and are not limited in the present invention.
Illustratively, on the basis of any one of the flexible display devices, the cross-sectional shape along the first direction of the plurality of selectable hollow structures includes at least one of a diamond shape, a regular pentagon shape, a regular hexagon shape, an ellipse shape and a circle shape, and any one corner of the hollow structures is a round corner. Any corner in the hollow structure is a fillet, stress concentration can be reduced by the fillet, and impact resistance and vibration capacity of the buffer membrane are improved. Fig. 9A to 9E are schematic diagrams illustrating various implementations of a flexible display device according to an embodiment of the present invention, and in particular, fig. 9A to 9E illustrate flexible display devices having hollow structures with different cross-sectional shapes, where the corresponding hollow structures may be pyramids, pentagons, hexagons, ellipsoids, circles, and the like, and the hollow structures can improve the impact resistance of the flexible display panel and enhance the bending resistance of the flexible display panel. It can be understood by those skilled in the art that any three-dimensional structure with a cross-sectional area from small to large to small falls within the protection scope of the hollow structure of the present invention, and will not be described or limited herein.
Illustratively, in addition to any one of the above-described flexible display devices, the constituent material of the optional buffer film includes any one or more of metal, plastic, resin, and rubber. The buffer film formed by the metal material has good ductility and is easy to form; the buffer film formed by plastic, resin or rubber material has good bending property and low cost. It is understood by those skilled in the art that the constituent materials of the buffer film include, but are not limited to, the above materials, and any elastic material with a buffer function falls within the scope of the present invention, and will not be described herein. The film layers formed by the materials have elastic characteristics and can play a role in buffering, and the film layers formed by the materials are compact, so that the film layers can effectively shield and block external water and oxygen and play a role in moisture prevention.
Illustratively, in addition to any one of the above flexible display devices, the buffer film may be made of any one or more of copper, aluminum, steel, alloy, and polyethylene terephthalate. The metal such as copper, aluminum, steel, alloy and the like has low hardness and cost, and is suitable for manufacturing the buffer film. The polyethylene glycol terephthalate has excellent physical and mechanical properties, can reach 120 ℃ after long-term use, has excellent electrical insulation, good friction resistance and dimensional stability, and is suitable for being made into a buffer film. It is understood by those skilled in the art that the constituent materials of the buffer film include, but are not limited to, the above materials, and any elastic material with a buffer function falls within the scope of the present invention, and will not be described herein.
Illustratively, on the basis of the technical scheme, the optional buffer film is made of antistatic liquid, so that the buffer film has an antistatic function, can play a role in electrostatic protection, and prevents external static from being led into the flexible display panel to damage a circuit device of the flexible display panel. Alternatively, the optional flexible display device further comprises: the anti-static layer formed on the surface of one side, away from the flexible display panel, of the buffer film can play a role in static protection, and prevents external static from being led into the flexible display panel and further damaging a circuit device of the flexible display panel.
Another embodiment of the present invention further provides a method for manufacturing a flexible display device, where the flexible display device is any one of the flexible display devices described above. A method for manufacturing a flexible display device will be described in detail with reference to fig. 10 and fig. 11A to 11C. The manufacturing method provided by the embodiment comprises the following steps:
The cross-sectional area of the hollow structure parallel to the flexible display panel is changed from small to large to small, so that in the manufacturing process, at least two completely same buffer thin layers 310 can be formed, a plurality of grooves 313 are formed on the buffer thin layers 310 by adopting an etching process, the plurality of grooves 313 can be selected to be uniformly distributed in the buffer film 310 of the first buffer area 311, and the composition material of the selected buffer thin layers 310 is the same as that of the buffer film material described in the above embodiment. It will be understood by those skilled in the art that a plurality of grooves may be formed simultaneously in the buffer film of the second buffer region in other alternative embodiments, and the number, process, etc. of the buffer thin layers are not particularly limited in the present invention.
As described above, the two buffer thin layers 310 are attached together, and the grooves 313 of the two buffer thin layers 310 are overlapped in a one-to-one correspondence, so that the two grooves 313 in direct contact form a hollow structure 321, and the two buffer thin layers 310 in direct contact form the buffer film 320. Two buffer thin layers 310 may be attached together optionally using an adhesive.
As will be understood by those skilled in the art, the buffer film has a buffering function and cannot affect the display of the flexible display panel, and therefore, the buffer film is attached to a second side surface of the flexible display panel opposite to the first side surface for displaying the image; in other alternative embodiments, the buffer film may be attached to the sidewall of the flexible display panel at the same time as the second side surface of the flexible display panel is attached; in other alternative embodiments, the buffer film may be attached to the sidewall of the flexible display panel and the non-display region of the first side surface of the flexible display panel at the same time as the second side surface of the flexible display panel.
An embodiment of the present invention further provides an electronic device, where the electronic device includes any one of the flexible display apparatuses described above, such as any product or component having a flexible display screen, such as a folding smart phone, a wearable smart watch, smart glasses, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted display, and the like. The flexible display device is provided with a buffer film as described in any of the above embodiments.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A flexible display device, comprising:
a flexible display panel having a first side surface displaying an image and a second side surface opposite to the first side surface;
the buffer film is at least formed on the second side surface of the flexible display panel and provided with a second buffer area and a first buffer area surrounding the second buffer area, a plurality of hollow structures are arranged in the buffer film of the first buffer area, and when the flexible display panel is in a planar state, the cross section area of each hollow structure along the second direction parallel to the flexible display panel is gradually increased to a preset area and then gradually reduced in the first direction perpendicular to the flexible display panel;
the hollow structures are mutually isolated;
the buffer film is disposed only on the second side surface of the flexible display panel, or,
the buffer film of the second buffer area is located on the second side surface of the flexible display panel, and the buffer film of the first buffer area surrounds the flexible display panel and is in direct contact with the edge side wall of the flexible display panel.
2. The flexible display device according to claim 1, wherein a sum of volumes of the plurality of hollow structures is less than or equal to half of a volume of the buffer film of the first buffer region.
3. The flexible display device according to claim 1, wherein a plurality of hollow structures are provided in the buffer film of the second buffer region, and a sum of volumes of the plurality of hollow structures is less than or equal to one half of a volume of the buffer film of the second buffer region.
4. The flexible display device according to any one of claims 1 to 3, wherein a cross-sectional shape of the plurality of hollow structures along the first direction comprises at least one of a diamond shape, a regular pentagon shape, a regular hexagon shape, an ellipse shape, and a circle shape, and any one corner of the hollow structures is a rounded corner.
5. The flexible display device of claim 1, wherein a constituent material of the buffer film comprises any one or more of metal, plastic, resin, and rubber.
6. The flexible display device of claim 5, wherein the buffer film comprises any one or more of copper, aluminum, steel, alloys, and polyethylene terephthalate.
7. The flexible display device of claim 5, wherein the buffer film is composed of a material further comprising an antistatic liquid.
8. The flexible display device of claim 1, further comprising: and the antistatic layer is formed on the surface of one side of the buffer film, which faces away from the flexible display panel.
9. An electronic device, characterized in that the electronic device comprises a flexible display device according to any of claims 1-8.
10. A method of manufacturing a flexible display device, the method comprising:
providing at least two buffer thin layers, wherein each buffer thin layer is provided with a second buffer area and a first buffer area surrounding the second buffer area, and a plurality of grooves are formed in the first buffer area;
attaching one buffer thin layer to the other buffer thin layer to enable the grooves of the two buffer thin layers to be correspondingly overlapped one by one to form a buffer film with a plurality of hollow structures, wherein the hollow structures are isolated from each other;
providing a flexible display panel, wherein the flexible display panel is provided with a first side surface for displaying images and a second side surface opposite to the first side surface, and attaching the buffer film to the second side surface of the flexible display panel, wherein the buffer film is only arranged on the second side surface of the flexible display panel, or the buffer film of the second buffer area is positioned on the second side surface of the flexible display panel, and the buffer film of the first buffer area surrounds the flexible display panel and is directly contacted with the edge side wall of the flexible display panel;
when the flexible display panel is in a planar state, in a first direction perpendicular to the flexible display panel, the cross-sectional area of the hollow structure along a second direction parallel to the flexible display panel is gradually increased to a preset area and then gradually decreased.
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