CN111415586B - Flexible display panel and display device - Google Patents
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- CN111415586B CN111415586B CN202010239553.8A CN202010239553A CN111415586B CN 111415586 B CN111415586 B CN 111415586B CN 202010239553 A CN202010239553 A CN 202010239553A CN 111415586 B CN111415586 B CN 111415586B
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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
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Abstract
The invention discloses a flexible display panel and a display device, wherein the flexible display panel comprises at least one group of bending groups, each bending group comprises a bending area, two bending transition areas and two flat areas, the flexible display panel comprises a cover plate, a flexible OLED device, a supporting layer and a flat buffer piece, the flexible OLED device is arranged on one side of the thickness of the cover plate, the supporting layer is arranged on one side of the flexible OLED device, which is opposite to the cover plate, surface concave parts are respectively formed on the supporting layer positioned in each bending transition area, so that the minimum thickness of the supporting layer positioned in the bending transition areas is smaller than that of the supporting layer positioned in the flat areas, and the flat buffer pieces are filled in the surface concave parts; the flexible display panel has a folded state, the bending area is bent to form a bending part in the folded state, the two flat areas are overlapped to form a flat part, and the width of the bending part is larger than that of the flat part in the thickness direction of the cover plate. The flexible display panel has good bending resistance and is reliable to use.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel and a display device.
Background
The flexible display panel is a display panel formed on the basis of a flexible substrate material, and has the characteristics of being curled, wide in visual angle, convenient to carry and the like, so that the flexible display panel has wide application prospect and good market potential in portable products and most display application fields.
In the related art, when the flexible water drop type foldable display panel is folded, for example, folded inwards, the cover plate and the flexible OLED device are easily separated, so that the flexible display panel has poor bending resistance and poor reliability.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention provides a flexible display panel, which has good bending resistance and is reliable in use.
The invention also provides a display device with the flexible display panel.
According to the flexible display panel of the first aspect of the present invention, the flexible display panel includes at least one bending group, the bending group includes a bending region, two bending transition regions and two flat regions, the two flat regions are respectively located at two sides of the bending region in a bending direction of the flexible display panel, and each flat region is respectively connected to the bending region through one bending transition region, the flexible display panel includes: a cover plate; the flexible OLED device is arranged on one side of the thickness of the cover plate and is connected with the cover plate in an adhering mode; the supporting layer is arranged on one side, back to the cover plate, of the flexible OLED device, and surface concave parts are formed on the supporting layer in each bending transition area respectively, so that the minimum thickness of the supporting layer in each bending transition area is smaller than that of the supporting layer in each flat area; the flexible display panel is provided with a folding state, the bending areas are bent to form bending parts, the two flat areas are overlapped to form a flat part, and the width of the bending parts is larger than that of the flat parts in the thickness direction of the cover plate.
According to the flexible display panel, the supporting layer and the flat buffer piece are arranged, so that the flat buffer piece is filled in the surface concave part of the supporting layer, the strain generated by a glue layer between the flexible OLED device and the cover plate can be effectively reduced, the flexible OLED device and the cover plate are prevented from being easily separated, the bending resistance of the flexible display panel is effectively improved, the flexible display panel is reliable to use, and the display effect of the flexible display panel in the repeated folding process is ensured.
In some embodiments, the surface recesses include a first recess formed on a side surface of the support layer facing the flexible OLED device and/or a second recess formed on a side surface of the support layer facing away from the flexible OLED device.
In some embodiments, the minimum thickness of the support layer at the bend transition region is t g The thickness of the support layer in the flat area is t p Said t is g 、t p Satisfies the following conditions: 1/3 ≤ t g /t p ≤2/3。
In some embodiments, the thickness of the support layer at the inflection region is equal to the thickness of the support layer at the flat region.
In some embodiments, the surface of the support layer at the bend region is flush with the surface of the support layer at the bend transition region.
In some embodiments, the support layer at the bend region and the support layer at the bend transition region are both formed as a uniform thickness structure.
In some embodiments, the maximum thickness of the support layer at the bend transition region is t g ', said t g ' satisfies: t is t g ’＝t p 。
In some embodiments, the surface depression extends through the support layer.
In some embodiments, in a bending direction of the flexible display panel, a width h of the bending transition region satisfies: h is more than or equal to 1mm and less than or equal to 5 cm.
In some embodiments, the surface depression comprises a groove, the bottom wall of the groove is formed into a plane, or a curved surface, or a combination of different planes, or a combination of a plane and a curved surface, or a combination of different curved surfaces, and in the thickness direction of the cover plate, the orthographic projection of the support layer at the bending transition area coincides with the orthographic projection of the bottom wall of the groove; or, the surface depression part comprises a plurality of grooves which are sequentially arranged along the bending direction of the flexible display panel, a bulge is arranged between every two adjacent grooves, and the thickness of the supporting layer corresponding to the bulge is equal to that of the supporting layer located in the flat area.
In some embodiments, two of the bending transition areas of the bending group are a first bending transition area and a second bending transition area, respectively, and a minimum thickness of the supporting layer located in the first bending transition area is equal to a minimum thickness of the supporting layer located in the second bending transition area.
In some embodiments, the flat buffer is a rubber, or a silicone, or a foam.
A display device according to a second aspect of the invention comprises a flexible display panel according to the above first aspect of the invention.
According to the display device provided by the invention, the flexible display panel of the first aspect is arranged, so that good bending resistance is ensured, and good use reliability is achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a flexible display panel according to a first embodiment of the present invention, wherein the flexible display panel is in a folded state;
FIG. 2 is another schematic view of the flexible display panel shown in FIG. 1, wherein the flexible display panel is in an unfolded state;
FIG. 3 is a partial schematic view of the flexible display panel shown in FIG. 1;
fig. 4 is a schematic diagram of the flexible display panel shown in fig. 1 in cooperation with a jig, wherein the flexible display panel is in a folded state;
FIG. 5 is another schematic diagram of the flexible display panel shown in FIG. 4 in cooperation with a fixture, wherein the flexible display panel is in an unfolded state;
fig. 6 is a schematic view of a flexible display panel according to a second embodiment of the invention;
fig. 7 is a schematic view of a flexible display panel according to a third embodiment of the present invention;
FIG. 8 is a schematic diagram of the flexible display panel shown in FIG. 7 in cooperation with a fixture, wherein the flexible display panel is in an unfolded state;
fig. 9 is another schematic view of the flexible display panel shown in fig. 7 in cooperation with a jig, wherein the flexible display panel is in a folded state;
fig. 10 is a schematic view of a flexible display panel according to a fourth embodiment of the present invention;
fig. 11 is a schematic view of a flexible display panel according to embodiment five of the present invention;
fig. 12 is a schematic diagram of the flexible display panel shown in fig. 11 in cooperation with a jig, wherein the flexible display panel is in a folded state;
fig. 13 is a schematic view of a flexible display panel according to a sixth embodiment of the present invention;
fig. 14 is a schematic view of a flexible display panel according to a seventh embodiment of the present invention;
fig. 15 is a schematic view of a flexible display panel according to an eighth embodiment of the present invention;
fig. 16 is a schematic view of a flexible display panel according to embodiment nine of the present invention;
fig. 17 is a schematic view of a flexible display panel according to a tenth embodiment of the present invention;
fig. 18 is a schematic view of the flexible display panel shown in fig. 17 in cooperation with a jig, wherein the flexible display panel is in a folded state;
fig. 19 is a schematic view of a flexible display panel according to embodiment eleven of the present invention.
Reference numerals:
a flexible display panel 100, a jig 101,
A bending group A,
A bending region A1, a bending transition region A2, a flat region A3,
A first bending transition area A21, a second bending transition area A22,
A first flat region A31, a second flat region A32,
A cover plate 1,
A flexible OLED device 2, a polarizer layer 21, a touch function layer 22, a display layer 23, a protective film layer 24,
The supporting layer 3, the surface recess 31, the first recess 31a, the second recess 31b,
A groove 311, a projection 312,
A flat buffer 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.
Next, a flexible display panel 100 according to an embodiment of the first aspect of the present invention is described with reference to the drawings.
As shown in fig. 1 and fig. 2, the flexible display panel 100 includes at least one bending group a, where the bending group a includes a bending region a1, two bending transition regions a2, and two flat regions A3, the two flat regions A3 are respectively located at two sides of the bending region a1 in the bending direction of the flexible display panel 100, and each flat region A3 is connected to the bending region a1 through one bending transition region a 2.
For example, in the example of fig. 1 and fig. 2, the two bending transition areas a2 are a first bending transition area a21 and a second bending transition area a22, respectively, the two flat areas A3 are a first flat area a31 and a second flat area a32, respectively, the first flat area a31 and the second flat area a32 are located on two sides of the bending area a1 in the bending direction of the flexible display panel 100, the first flat area a31 is connected to one side of the bending area a1 through the first bending transition area a21, and the second flat area a32 is connected to the other side of the bending area a1 through the second bending transition area a 22.
The flexible display panel 100 has a folded state (as shown in fig. 1) in which the bending region a1 is bent to form a bending portion B1, two flat regions A3 are overlapped to form a flat portion B2, and the width T of the bending portion B1 is greater than the width T of the flat portion B2 in the thickness direction (e.g., the up-down direction in fig. 1) of the cover plate 1.
Here, the width T of the bent portion B1 may be understood as the width of the entire bent portion B1 occupying the space in the thickness direction of the lid plate 1, and the width T of the flat portion B2 may be understood as the width of the entire flat portion B2 occupying the space in the thickness direction of the lid plate 1. Since T is greater than T, the flexible display panel 100 in the folded state is not U-shaped, and instead, the bent portion B1 is substantially formed into a droplet shape, so that the flexible display panel 100 is formed into a flexible droplet-shaped foldable display panel, that is, the bent portion B1 has a larger bending radius, for example, the bent portion B1 has the largest bending radius when the flexible display panel 100 is in the folded state, and the bent portion B1 assumes an ideal droplet circle state.
It should be noted that, in folded state, the flexible display panel that is the U-type, its radius of bending is relatively less, and the clearance between two flat districts of the flat portion of this flexible display panel is great, lead to flexible display panel's whole thickness great, the appearance is unsightly, use experience is not good enough, and if this kind of flexible display panel wants to accomplish totally closed, when making the clearance between two flat districts of flat portion be 0, the radius of bending part will be minimum, flexible display panel's material and reliance all are difficult to satisfy.
In the present application, since T is greater than T, the flexible display panel 100 is formed as a flexible droplet-shaped display panel in a folded state, the gap between the two flat regions A3 of the flat portion B2 is small, and even the two flat regions A3 can be in contact with each other, so that the gap between the two flat regions A3 is 0, for example, when the flexible display panel 100 is folded inward, wherein the cover plate 1 of one flat region A3 and the cover plate 1 of the other flat region A3 are close to each other, the gap between the lid 1 at one of the flat sections A3 and the lid 1 at the other flat section A3 may be made 0, thereby being beneficial to reducing the whole thickness of the flexible display panel 100, being convenient to realize the minimization of the involution thickness of the flexible display panel 100 after being bent, meanwhile, the bending radius of the bending part B1 is larger, which is convenient for ensuring the realizability and reliability of the flexible display panel 100, and the water drop shape is more beautiful.
As shown in fig. 1 and 3, the flexible display panel 100 includes a cover plate 1, a flexible OLED device 2, and a support layer 3, the flexible OLED device 2 is disposed on a thickness side of the cover plate 1, and the flexible OLED device 2 is bonded to the cover plate 1, for example, the flexible OLED device 2 may be connected to the cover plate 1 through an optical adhesive layer, the support layer 3 is disposed on a side of the flexible OLED device 2 facing away from the cover plate 1, and the flexible OLED device 2 is disposed between the cover plate 1 and the support layer 3. The support layer 3 at each bending transition area a2 is formed with a surface depression 31, so that the minimum thickness of the support layer 3 at the bending transition area a2 is smaller than the thickness of the support layer 3 at the flat area A3. The flexible display panel 100 further includes a flat buffer 4, and the flat buffer 4 is filled in the surface recess 31.
Through analysis and research, the inventor finds that the thickness of the supporting layer 3 is thicker than that of the whole flexible display panel 100, so that when the flexible display panel 100 is bent, parameters such as mechanical properties of the supporting layer 3 have great influence on bending reliability, deformability, stress and the like of the whole flexible display panel 100, and the mechanical parameters, the thickness and the like of the supporting layer 3 can directly influence the integral bending performance of each thin film layer of the flexible OLED device 2 attached thereon; it is also found that the flexible OLED device and the cover plate are easily separated in the bending transition area, that is, the flexible OLED device and the cover plate corresponding to the bending transition area are most easily damaged, and through the cooperation of the flexible display panel 100 and the jig 101, the bending transition area a2 is easily subjected to stress concentration, so that the technical scheme of the application is provided.
The flat buffer member 4 is filled in the surface concave part 31 of the support layer 3 in the bending transition area A2, so that the resilience of the flexible display panel 100 in a folded state is effectively reduced, the stress of a rubber material of the flexible display panel 100, such as the rubber material between the flexible OLED device 2 and the cover plate 1, is reasonable, the deformation is reduced, and the risk of separating the flexible OLED device 2 from the cover plate 2 is reduced, meanwhile, by arranging the flat buffer member 4, because the flat buffer member 4 has certain elasticity, the bending transition area A2 can be compensated, the stress concentration of the bending transition area A2 is weakened, a good compensation and stress buffering effect is achieved, meanwhile, when the jig 101 is adopted to bend the flexible display panel 100, the flat buffer member 4 can achieve the flattening of the support layer 3, the jig 101 can better push the bending transition area A2, so as to achieve the bending of the bending transition area A2, and therefore the reliability of the flexible display panel 100 in a folded state is better achieved, thereby preventing the adhesive material of the flexible display panel 100 from being pulled out and peeled off during repeated folding processes.
Compared with some technologies, in order to reduce the crease generated in the repeated folding process of the flexible display panel, a metal support layer with good resilience is attached to the flexible display panel, but due to the fact that the metal support layer has a large elastic modulus, the flexible OLED device and the cover plate are prone to being separated in the inward folding process of the flexible display panel (for example, the cover plate is separated from the polarizer easily), so that the bending resistance of the flexible water drop type display panel is reduced, and the flexible water drop type folding display panel cannot be used normally after being repeatedly bent; and flexible display panel 100 in this application is through setting up supporting layer 3 and flat buffer 4, make flat buffer 4 fill in the surperficial depressed part 31 of supporting layer 3, can effectively reduce flexible display panel 100 in the in-process of buckling (for example, the infolding), the difference in strain between flexible OLED device 2 and the apron 1, reduce the strain that the optical bonding glue film between flexible OLED device 2 and the apron 1 produced, in order to avoid easily taking place to separate between flexible OLED device 2 and the apron 1, thereby effectively promoted flexible display panel 100's bending resistance ability, make flexible display panel 100 use reliably, and guaranteed the display effect of flexible display panel 100 in the repeated folding in-process.
Wherein the thickness of the flat buffer 4 is substantially equal to the depth of the surface recess 31, the following cases can be included: 1. the thickness of the flat cushion 4 is absolutely equal to the depth of the surface recess 31; 2. there is a negligible error between the thickness of the flat cushion 4 and the depth of the surface recess 31. Thereby, it is convenient to further ensure the planarization of the flexible display panel 100.
In some embodiments, the formation of the concave portion 31 on the upper surface of the supporting layer 3 may be realized by performing a thinning process on the supporting layer 3, for example, by performing a laser Hatching (laser Hatching) or a localized dry etching process to realize a patterned thinning of the supporting layer 3 in a specific region, i.e., the bending transition region a 2. But is not limited thereto.
Alternatively, the support layer 3 may be a metal member, but is not limited thereto. For example, the support layer 3 may be PI (polyimide), the thickness of the support layer 3 may be 20mm to 50mm, and the elastic modulus may be 2GPa to 10 GPa; the surface of the support layer 3 can be provided with a release film. Therefore, the support layer 3 is convenient to ensure enough resilience, and the recovery effect of the bending crease is favorably improved.
In some embodiments, the surface recesses 31 include a first recess 31a and/or a second recess 31b, the first recess 31a is formed on a side surface of the support layer 3 facing the flexible OLED device 2, and the second recess 31b is formed on a side surface of the support layer 3 facing away from the flexible OLED device 2, which includes the following cases: 1. the surface recess 31 includes a first recess 31a and does not include a second recess 31 b; 2. the surface recess 31 includes the second recess 31b and does not include the first recess 31 a; 3. the surface recess 31 includes a first recess 31a and a second recess 31 b. From this, the structural design of superficial depressed part 31 has been richened, has realized that the structure of superficial depressed part 31 is diversified, is favorable to flexible display panel 100 to satisfy actual differentiation demand, promotes the suitability.
For example, as shown in fig. 6 and 13, the surface recess 31 includes a first recess 31a and does not include a second recess 31b, in this case, a side surface of the support layer 3 facing the flexible OLED device 2 in the bending transition region a2 may be disposed non-flush with a side surface of the support layer 3 facing the flexible OLED device 2 in the flat region A3, a side surface of the support layer 3 facing away from the flexible OLED device 2 in the bending transition region a2 may be flush with a side surface of the support layer 3 facing away from the flexible OLED device 2 in the flat region A3, and a side surface of the support layer 3 facing away from the flexible OLED device 2 in the bending transition region a2 and a side surface of the support layer 3 facing away from the flexible OLED device 2 in the flat region A3 are located on the same plane or the same curved surface; for another example, as shown in fig. 3, 7, 10, 11, and 14-17, the surface recess 31 includes the second recess 31b and does not include the first recess 31a, in this case, a side surface of the support layer 3 facing away from the flexible OLED device 2 in the bending transition region a2 may be disposed non-flush with a side surface of the support layer 3 facing away from the flexible OLED device 2 in the flat region A3, a side surface of the support layer 3 facing towards the flexible OLED device 2 in the bending transition region a2 may be flush with a side surface of the support layer 3 facing towards the flexible OLED device 2 in the flat region A3, and a side surface of the support layer 3 facing towards the flexible OLED device 2 in the bending transition region a2 and a side surface of the support layer 3 facing towards the flexible OLED device 2 in the flat region A3 are located on the same plane or the same curved surface; for another example, the surface recess 31 includes a first recess 31a and a second recess 31b, in this case, a side surface of the support layer 3 facing the flexible OLED device 2 in the bending transition region a2 is not flush with a side surface of the support layer 3 facing the flexible OLED device 2 in the flat region A3, and a side surface of the support layer 3 facing away from the flexible OLED device 2 in the bending transition region a2 is also not flush with a side surface of the support layer 3 facing away from the flexible OLED device 2 in the flat region A3.
In some embodiments, as shown in fig. 3, the minimum thickness of the support layer 3 at the bending transition area a2 is t g The thickness of the support layer 3 at the flat area A3 is t p ，t g 、t p Satisfies the following conditions: 1/3 is less than or equal to t g /t p 2/3, thereby through the minimum thickness that sets up the supporting layer 3 that is located the transition zone A2 of buckling, be convenient for weaken the resilience force of the supporting layer 3 that is located the transition zone A2 of buckling, for example, can make the resilience force of the supporting layer 3 that is located the transition zone A2 of buckling descend at least half, make the supporting layer 3 that is located the transition zone A2 of buckling have suitable resilience, the deformation of flexible display panel 100 gluing material has been weakened, avoid the supporting layer 3 resilience that is located the transition zone A2 of buckling too big to lead to the flexible display screen easily to take place the peel-off phenomenon, also can avoid the supporting layer 3 resilience undersize that is located the transition zone A2 of buckling to lead to the flexible display panel 100 easily to produce the crease.
For example, when the surface recesses 31 are not formed on the support layer 3, the entire support layer 3 of the flexible display panel 100 may be formed in an equal thickness structure, and the maximum depth of the surface recesses 31 may occupy between 1/3 and 2/3 of the thickness of the support layer 3.
It will be appreciated that the support layer 3 at the bending transition region a2 can be formed in a uniform thickness structure, and the minimum thickness t of the support layer 3 at the bending transition region a2 g I.e. the thickness of the support layer 3 at any position in the bend transition region a 2; of course, the support layer 3 at the bending transition area a2 may also be formed as a non-uniform thickness structure.
In some embodiments, as shown in fig. 3, fig. 6, fig. 10, fig. 11, and fig. 13 to fig. 19, the thickness of the support layer 3 located in the bending region a1 is equal to the thickness of the support layer 3 located in the flat region A3, so that the entire support layer 3 of the flexible display panel 100 may be thinned only in the bending transition region a2, which facilitates the processing of the flexible display panel 100 and improves the processing efficiency.
Of course, the thickness of the support layer 3 at the bending region a1 and the thickness of the support layer 3 at the flat region A3 may not be equal.
For example, as shown in fig. 7-9, the surface of the support layer 3 located in the bending region a1 is flush with the surface of the support layer 3 located in the bending transition region a2, and the surface of the support layer 3 located in the bending region a1 and the corresponding surface of the support layer 3 located in the bending transition region a2 are located on the same plane or the same curved surface, so that the thickness of the support layer 3 located in the bending region a1 is unequal to the thickness of the support layer 3 located in the flat region A3, thereby further enriching the design of the flexible display panel 100.
For example, in the examples of fig. 7 to 9, the support layer 3 located in the bending region a1 and the support layer 3 located in the bending transition region a2 are both formed in an equal-thickness structure, so that the thickness of the support layer 3 located in the bending region a1 is equal to the thickness of the support layer 3 located in the bending transition region a2, and the entire support layer 3 of the flexible display panel 100 may be thinned in both the bending region a1 and the bending transition region a2, and since the thicknesses of the support layer 3 in the bending region a1 and the bending transition region a2 are equal during the thinning process, it is beneficial to simplify the thinning process and improve the processing efficiency.
In some embodiments, as shown in fig. 14, 16 and 17, the maximum thickness t of the support layer 3 at the bending transition area a2 is g ’，t g ’＝t p At this time, the supporting layer 3 located in the bending region a1 may be locally thinned, so that the thinning area is reduced on the premise of ensuring the bending resistance of the flexible display panel 100, which is beneficial to improving the processing efficiency.
Of course, the maximum thickness t of the support layer 3 at the bend transition area A2 g ' may also be less than t p The weakening strength of the recovery performance of the support layer 3 is ensured, and the bending resistance of the flexible display panel 100 can be enhanced.
In some embodiments, as shown in fig. 19, the surface recesses 31 penetrate through the supporting layer 3, and the surface recesses 31 on the supporting layer 3 are formed as through holes, and the flat buffer 4 is filled in the through holes, so that the resilience of the supporting layer 3 can be ensured, and the stress buffer of the supporting layer 3 can be realized.
In some embodiments, as shown in fig. 3, in the bending direction of the flexible display panel 100, the width h of the bending transition region a2 satisfies that h is greater than or equal to 1mm and less than or equal to 5cm, and then the bending transition region a2 has a proper width, so that a proper distance is provided between the flat region A3 and the bending region a1, which avoids that the bending transition region a2 has a smaller width and is easy to generate stress concentration, and also avoids that the bending transition region a2 has a larger width and causes a smaller bending radius of the bending region a1 in the folded state, which results in higher reliability and material requirements for the flexible display panel 100.
In the example of fig. 1, in the bending direction of the flexible display panel 100, the bending transition region a2 may be centered at the starting position of the water drop type structure formed by bending the bending region a1 in the folded state.
In some embodiments, the surface recess 31 includes a groove 311, the bottom wall of the groove 311 is formed as a plane, or a curved surface, or a combination of different planes, or a combination of a plane and a curved surface, or a combination of different curved surfaces, and then in the cross section of the groove 311, the bottom wall of the groove 311 is formed as a plane, or a curved surface, or a combination of different planes, or a combination of a plane and a curved surface, or a combination of different curved surfaces; in the thickness direction of the cover plate 1, the orthographic projection of the support layer 3 located in the bending transition area a2 coincides with the orthographic projection of the bottom wall of the groove 311, and at this time, the whole support layer 3 located in the bending transition area a2 can be thinned, and the edge of the bending transition area a2 is removed, and the maximum thickness of the support layer 3 in the bending transition area a2 is smaller than the thickness of the support layer 3 located in the flat area A3. Wherein, at the edge of the bending transition area a2, the thickness of the support layer 3 may be less than or equal to the thickness of the support layer 3 in the flat area A3.
It will be appreciated that the cross-sectional shape of the recess 311 may be specifically configured according to the application. For example, in the examples of fig. 3, 6, and 7, the bottom wall of the groove 311 is formed as a plane, such as a cross-sectional shape of the groove 311 of a v, 21274; for another example, in the examples of fig. 10, 11, and 13, the bottom wall of the groove 311 is formed into a curved surface, such as a cross-sectional shape of the groove 311 is a semi-ellipse; for another example, the bottom wall of the recess 311 is formed as a combination of different planes, such as the cross-sectional shape of the recess 311 is a dogleg; for another example, in the example of fig. 15, the bottom wall of the recess 311 is formed as a combination of different curved surfaces. It should be noted that the "curved surface" may be understood as a smooth curved surface.
In other embodiments, the surface depression 31 includes a plurality of grooves 311, the plurality of grooves 311 are sequentially arranged along the bending direction of the flexible display panel 100, a protrusion 312 is disposed between two adjacent grooves 311, the thickness of the support layer 3 corresponding to the protrusion 312 is equal to the thickness of the support layer 3 located in the flat area A3, and at this time, a local thinning process may be performed on the entire support layer 3 located in the bending transition area a 2.
For example, in the example of fig. 16, the plurality of grooves 311 are arranged at intervals along the bending direction of the flexible display panel 100; for another example, in the example of fig. 14, the plurality of grooves 311 are provided without intervals in the bending direction of the flexible display panel 100. It is understood that the cross-sectional shape of the recess 311 may be set according to the actual application, for example, the bottom wall of the recess 311 is formed as a plane, or a curved surface, or a combination of different planes, or a combination of a plane and a curved surface, or a combination of different curved surfaces, and the cross-sectional shapes of the plurality of recesses 311 may be the same or different.
In some embodiments, the two bending transition areas a2 of bending group a are a first bending transition area a21 and a second bending transition area a22, respectively, and the minimum thickness of the support layer 3 located in the first bending transition area a21 is equal to the minimum thickness of the support layer 3 located in the second bending transition area a 22. From this, be convenient for supporting layer 3's processing, be convenient for guarantee simultaneously that supporting layer 3 is comparatively slick and sly, regular in the solid-state after buckling.
For example, in the example of fig. 1-19, the support layer 3 at the first bend transition a21 has the same structure as the support layer 3 at the second bend transition a22 for ease of processing.
In some embodiments, the flat cushion 4 is a rubber (e.g., TPU), or a silicone, or a foam. Of course, the flat buffer 4 may be made of other high molecular elastomer polymers, but is not limited thereto.
A display device according to an embodiment of the second aspect of the invention comprises a flexible display panel 100 according to the above-described embodiment of the first aspect of the invention.
According to the display device of the embodiment of the invention, by adopting the flexible display panel 100, good bending resistance is ensured, and good use reliability is achieved.
Other configurations and operations of the display device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
The flexible display panel 100 according to an embodiment of the present invention is described in detail in eleven specific embodiments with reference to fig. 1 to 19. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Example one
In this embodiment, as shown in fig. 1 to fig. 5, the flexible display panel 100 is an OLED display panel, the flexible display panel 100 includes a bending group a, the bending group a includes a bending region a1, two bending transition regions a2 and two flat regions A3, the two flat regions A3 are respectively located at two sides of the bending region a1 in the bending direction of the flexible display panel 100, and the flat regions A3 are respectively connected to the bending region a1 through one bending transition region a 2. The flexible display panel 100 has a folded state, and in the folded state, the bending area a1 is in the form of a water drop.
The flexible display panel 100 includes a cover plate 1, a flexible OLED device 2, a support layer 3 and a flat buffer 4, the flexible OLED device 2 is disposed on one side of the cover plate 1, the support layer 3 is disposed on one side of the flexible OLED device 2 facing away from the cover plate 1, a surface recess 31 is formed on each support layer 3 in each bending transition area a2, so that the minimum thickness of the support layer 3 in the bending transition area a2 is smaller than the thickness of the support layer 3 in the flat area A3, and the flat buffer 4 is filled in the surface recess 31.
The surface recesses 31 on the two bending transition regions a2 have the same structure, the surface recesses 31 include a second recess 31b, the second recess 31b is formed on the surface of the support layer 3 opposite to the flexible OLED device 2, the second recess 31b includes a groove 311, the bottom wall of the groove 311 is formed as a plane, and the groove 311 is formed by recessing the surface of the entire support layer 3 in the bending transition region a2, so that the support layer 3 in the bending transition region a2 is formed as an equal-thickness structure and has a thickness t g The thickness of the support layer 3 at the flat area A3 is t p ，1/3≤t g /t p Less than or equal to 2/3. Wherein, the support layer 3 located in the bending region a1 is formed into an equal thickness structure, and the thickness of the support layer 3 located in the bending region a1 and the thickness t of the support layer 3 located in the flat region A3 are equal p Are equal.
The flexible OLED device 2 comprises a polarizer layer 21, a touch function layer 22, a display layer 23 and a protection film layer 24, the polarizer layer 21 is connected with one side of the cover plate 1 in a bonding mode, the protection film layer 24 is attached to the surface of the support layer 3, the touch function layer 22 and the display layer 23 are stacked between the polarizer layer 21 and the display layer 23, and the touch function layer 22 is located on one side, far away from the support layer 3, of the display layer 23.
The supporting layer 3 has good elastic resilience, and has a large resilience in the bending transition area a2, and during the bending process, the side effect of the resilience is that the supporting layer 3 will want to overcome the pushing force of the jig 101 to restore the original shape, so that a large pulling force can be applied to the glue material of the flexible display panel 100; meanwhile, the bending transition area a2 should bend toward the cover plate 1 during the folding process, and the glue material of the flexible display panel 100 will be under the action of tension. Therefore, the rubber material is easily deformed greatly under the action of the responsible force, and the rubber material is peeled and layered. When the jig 101 bends the flexible display panel 100, the jig 101 is arranged corresponding to the flat area A3 and the bending transition area a2, that is, the jig 101 does not apply a direct bending acting force to the bending area a1 in the bending process; the part of the jig 101 corresponding to the bending transition region a2 may be designed with a transition arc chamfer to optimize the stress of the bending transition region a 2.
Therefore, in order to satisfy the resilience and protect the adhesive material, the flexible display panel 100 is designed regionally in the bending transition region a2, that is, the support layer 3 of the bending transition region 2 is thinned, and the flat buffer 4 is filled in the surface recess 31, so as to perform stress relaxation treatment on the bending transition region a2, thereby reducing the bending deformation generated by the optical adhesive layer between the flexible OLED device 2 and the cover plate 1, and enhancing the bending resistance of the bending transition region a 2.
Example two
As shown in fig. 6, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface recess 31 includes a first recess 31a, the first recess 31a is formed on a side surface of the support layer 3 facing the flexible OLED device 2, the first recess 31a includes a groove 311, and a bottom wall of the groove 311 is formed as a plane.
EXAMPLE III
As shown in fig. 7 to 9, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface of the support layer 3 at the bending area a1 is flush with the surface of the support layer 3 at the bending transition area a2, and the thickness of the support layer 3 at the bending area a1 is equal to the thickness of the support layer 3 at the bending transition area a 2.
Example four
As shown in fig. 10, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the bottom wall of the recess 311 is formed as a curved surface, and the cross-sectional shape of the bottom wall of the recess 311 is an elliptical arc.
EXAMPLE five
As shown in fig. 11 and 12, the present embodiment has substantially the same structure as the fourth embodiment, wherein the same reference numerals are used for the same components, except that: and the cross-sectional shape of the bottom wall of the recess 311 is a circular arc.
EXAMPLE six
As shown in fig. 13, the present embodiment has substantially the same structure as the fourth embodiment, wherein the same reference numerals are used for the same components, except that: the surface recess 31 comprises a first recess 31a, the first recess 31a being formed on a side surface of the support layer 3 facing the flexible OLED device 2, the first recess 31a comprising a recess 311.
EXAMPLE seven
As shown in fig. 14, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface depression 31 includes a second depression 31b, the second depression 31b includes a plurality of grooves 311, the plurality of grooves 311 are disposed at intervals along the bending direction of the flexible display panel 100, and a maximum thickness of the second depression 31b is equal to a thickness of the support layer 3 in the flat area a 3.
Example eight
As shown in fig. 15, the present embodiment has the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface recess 31 includes a second recess 31b, and the second recess 31b includes a groove 311, and the bottom wall of the groove 311 is formed as a combination of different curved surfaces.
Example nine
As shown in fig. 16, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface depression 31 includes a second depression 31b, the second depression 31b includes a plurality of grooves 311, the plurality of grooves 311 are spaced apart along the bending direction of the flexible display panel 100, the bottom wall of each groove 311 is formed as a circular arc surface, and the maximum thickness of the second depression 31b is equal to the thickness of the support layer 3 located in the flat area a 3.
Example ten
As shown in fig. 17 and 18, the present embodiment has substantially the same structure as the ninth embodiment, wherein the same reference numerals are used for the same components, except that: the bottom wall of each recess 311 is formed as a plane.
EXAMPLE eleven
As shown in fig. 19, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the surface depression 31 extends through the support layer 3, i.e. the thickness of the support layer 3 at the bending transition a2 is 0.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "width", "thickness", "upper", "lower", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (11)
1. A flexible display panel, characterized in that the flexible display panel comprises at least one set of bending groups, the bends
Roll over group and include a bending zone, two transition zones of buckling and two flat zones, two the flat zone is located respectively the bending zone is in flexible display panel buckles the ascending both sides in orientation, and every the flat zone respectively through one the transition zone of buckling with the bending zone links to each other, the transition zone circular arc transitional coupling of buckling the flat zone with the bending zone, flexible display panel includes:
a cover plate;
the flexible OLED device is arranged on one side of the thickness of the cover plate and is connected with the cover plate in an adhering mode;
the supporting layer is arranged on one side, back to the cover plate, of the flexible OLED device, and surface concave parts are formed on the supporting layer in each bending transition area respectively, so that the minimum thickness of the supporting layer in each bending transition area is smaller than that of the supporting layer in each flat area;
the flat buffer piece is filled in the surface concave part and is only positioned in the bending transition area,
the flexible display panel is provided with a folding state, the folding region is bent to form a bending part, two flat regions are superposed to form a flat part, and the width of the bending part is greater than that of the flat part in the thickness direction of the cover plate;
the minimum thickness of the supporting layer in the bending transition area is tg, the thickness of the supporting layer in the flat area is tp, and tg and tp meet the following requirements: 1/3 tg/tp 2/3.
2. The flexible display panel of claim 1, wherein the surface recesses comprise a first recess formed on a side surface of the support layer facing the flexible OLED device and/or a second recess formed on a side surface of the support layer facing away from the flexible OLED device.
3. The flexible display panel of claim 1, wherein the thickness of the support layer in the bending region is equal to the thickness of the support layer in the flat region.
4. The flexible display panel of claim 1, wherein a surface of the support layer at the bend region is flush with a surface of the support layer at the bend transition region.
5. The flexible display panel of claim 4, wherein the support layer at the bend region and the support layer at the bend transition region are each formed as a uniform thickness structure.
6. The flexible display panel of claim 1, wherein the maximum thickness of the support layer at the bend transition region is tg 'and the tg' satisfies: tg ═ tp.
7. The flexible display panel according to claim 1, wherein in a bending direction of the flexible display panel, a width h of the bending transition region satisfies: h is more than or equal to 1mm and less than or equal to 5 cm.
8. The flexible display panel of claim 1,
the surface concave part comprises a groove, the bottom wall of the groove is formed into a plane, a curved surface, a combination of different planes, a combination of a plane and a curved surface, or a combination of different curved surfaces, and in the thickness direction of the cover plate, the orthographic projection of the supporting layer positioned in the bending transition area is superposed with the orthographic projection of the bottom wall of the groove; or,
the surface concave part comprises a plurality of grooves which are sequentially arranged along the bending direction of the flexible display panel, a bulge is arranged between every two adjacent grooves, and the thickness of the supporting layer corresponding to the bulge is equal to that of the supporting layer positioned in the flat area.
9. The flexible display panel according to claim 1, wherein two of the bending transition regions of the bending group are a first bending transition region and a second bending transition region, respectively, and a minimum thickness of the support layer located in the first bending transition region is equal to a minimum thickness of the support layer located in the second bending transition region.
10. The flexible display panel of claim 1, wherein the flat buffer is a rubber, a silicone, or a foam.
11. A display device characterized by comprising the flexible display panel according to any one of claims 1 to 10.
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