Flexible display substrate, display panel and display device

Abstract

The present disclosure provides a flexible display substrate, a display panel and a display device, and belongs to the field of display devices. The flexible display substrate comprises a peripheral region and a display region, the peripheral region surrounds the display region; the peripheral region has a plurality of corner regions, at least one of the corner regions comprises two first regions and a second region located between the two first regions; the first region has a hollow structure, and the second region has at least one notch located at the edge of the flexible display substrate.

Description

Technical Field

[0001] This disclosure relates to the field of display devices, and in particular to a flexible display substrate, a display panel, and a display device. Background Technology

[0002] With the development of display technology, flexible display technology has become increasingly mature. In addition to bendable and foldable display substrates, stretchable display substrates have also gradually matured.

[0003] The stretchable flexible display substrate has a hollow structure located in the outer area of ​​the flexible display substrate. This allows the outer area to undergo tensile deformation when the flexible display substrate is stretched. For example, by stretching, the outer area can be attached to the bezel of the installed terminal to achieve a curved screen design.

[0004] However, for the four corners of the flexible display substrate, the stretching amount of the two adjacent sides of the flexible display substrate during the stretching process will be squeezed at the corner to form wrinkles, affecting the bonding effect. Summary of the Invention

[0005] This disclosure provides a flexible display substrate, a display panel, and a display device, which can improve the bonding wrinkle problem of stretchable display panels. The technical solution is as follows:

[0006] In a first aspect, embodiments of this disclosure provide a flexible display substrate, the flexible display substrate including a peripheral region and a display region, the peripheral region surrounding the display region;

[0007] The outer area has multiple corner areas, and at least one of the corner areas includes two first areas and a second area located between the two first areas;

[0008] The first region has a hollow structure, and the second region has at least one notch located at the edge of the flexible display substrate.

[0009] Optionally, the notch is a semi-elliptical notch, a semi-circular notch, a rectangular notch, a trapezoidal notch, or an arc-shaped notch.

[0010] Optionally, the long axis of the notch intersects the edge where the notch is located and has an intersection point.

[0011] For shapes like ellipses and semi-ellipses, the major axis is the major axis of the ellipse or semi-ellipse. For other symmetrical figures such as rectangles, the major axis can be the longest line segment of symmetry. For asymmetrical figures, the major axis can be the longest line segment passing through the center of the figure and with its two endpoints located at the edges of the figure.

[0012] Optionally, the notch is a semi-elliptical notch.

[0013] Optionally, the major axis of the semi-elliptical notch ranges from 200 to 600 μm;

[0014] The minor axis of the semi-elliptical notch ranges from 40 to 80 μm;

[0015] When the second region has multiple semi-elliptical notches, the minimum distance between adjacent semi-elliptical notches ranges from 5 to 40 μm.

[0016] Optionally, the second region includes:

[0017] Two first sub-regions and one second sub-region, the second sub-region being located between the two first sub-regions, the first sub-regions and the second sub-region being arranged along the extending direction of the edge of the flexible display substrate, and the notch being located in the two first sub-regions.

[0018] Optionally, the second sub-region is located at the center of the corner region.

[0019] Optionally, the second sub-region is a non-hollowed-out region.

[0020] Optionally, the flexible display substrate further includes peripheral circuitry;

[0021] At least a portion of the peripheral circuit is located within the second region.

[0022] Optionally, the peripheral circuit includes a GOA circuit located within the second sub-region.

[0023] Optionally, the hollow structure includes a plurality of I-shaped holes, wherein the plurality of I-shaped holes include at least one of a first through hole and a second through hole;

[0024] The first through hole includes a first strip-shaped main body and two trapezoidal parts, the two trapezoidal parts being located at both ends of the first strip-shaped main body, and the upper bottom of the trapezoidal parts being connected to the first strip-shaped main body;

[0025] The second through hole includes a second strip-shaped main body and two strip-shaped branch portions. The two strip-shaped branch portions are located at both ends of the second strip-shaped main body, and the middle part of the strip-shaped branch portions is connected to the second strip-shaped main body.

[0026] Optionally, the length of the first strip-shaped main body or the second strip-shaped main body ranges from 170 to 600 μm;

[0027] The length of the trapezoidal portion or the strip-shaped branch portion ranges from 60 to 160 μm;

[0028] The width of the first strip-shaped main body and the trapezoidal part, or the second strip-shaped main body and the strip-shaped branch, ranges from 4 to 50 μm.

[0029] The minimum distance between adjacent I-shaped holes ranges from 80 to 200 μm.

[0030] Optionally, the gap between two adjacent I-shaped holes is a bridge area, and the gap formed by four adjacent I-shaped holes is an island area;

[0031] The wiring is arranged within the bridge area, and the peripheral circuits are arranged within the island area.

[0032] Optionally, the display area has a hollow structure, and within a unit area, the area of ​​the hollow structure located in the display area is larger than the area of ​​the hollow structure located in the peripheral area.

[0033] Optionally, the hollow structure of the display area includes a plurality of I-shaped holes, wherein the plurality of I-shaped holes include at least one of a first through hole and a second through hole;

[0034] The first through hole includes a first strip-shaped main body and two trapezoidal parts, the two trapezoidal parts being located at both ends of the first strip-shaped main body, and the upper bottom of the trapezoidal parts being connected to the first strip-shaped main body;

[0035] The second through hole includes a second strip-shaped main body and two strip-shaped branch portions. The two strip-shaped branch portions are located at both ends of the second strip-shaped main body, and the middle part of the strip-shaped branch portions is connected to the second strip-shaped main body.

[0036] Optionally, the length of the first strip-shaped main body portion or the second strip-shaped main body portion located in the display area is greater than the length of the first strip-shaped main body portion or the second strip-shaped main body portion located in the peripheral area.

[0037] Optionally, within the display area, the length of the first strip-shaped main body portion or the second strip-shaped main body portion ranges from 250 to 800 μm;

[0038] The length of the trapezoidal portion or the strip-shaped branch portion ranges from 100 to 250 μm;

[0039] The width of the first strip-shaped main body and the trapezoidal part, or the second strip-shaped main body and the strip-shaped branch, ranges from 4 to 50 μm;

[0040] The minimum distance between adjacent I-shaped holes ranges from 40 to 100 μm.

[0041] Optionally, a bridge area and an island area are provided between the I-shaped holes in the display area;

[0042] The area of ​​the island area in the display area is smaller than the area of ​​the island area in the peripheral area, and the width of the bridge area in the display area is smaller than the width of the bridge area in the peripheral area.

[0043] Optionally, the flexible display substrate includes:

[0044] A flexible substrate, a display functional film layer and a cover plate are sequentially located on the flexible substrate, wherein the projections of the edges of the flexible substrate and the cover plate onto the plane containing the surface of the display functional film layer are located outside the surface of the display functional film layer.

[0045] In a second aspect, embodiments of this disclosure provide a display panel, the display panel comprising a flexible display substrate as described in any of the first aspects.

[0046] Thirdly, embodiments of this disclosure provide a display device, the display device including a display panel as described in the second aspect.

[0047] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0048] By providing a notch at the edge of the second region in the middle of the corner area of ​​the outer periphery of the flexible display substrate, when the outer periphery of the flexible display substrate is stretched downward and bonded to the frame of the installed terminal, the notch can absorb the shrinkage deformation during bonding, and the deformation in the corner area can be offset by the notch, thereby improving the problem of wrinkles formed during bonding in the corner area and improving the bonding effect. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of a region of a flexible display substrate provided in an embodiment of this disclosure;

[0051] Figure 2 This is a schematic diagram of the structure of a flexible display substrate provided in an embodiment of this disclosure;

[0052] Figure 3 This is a schematic diagram of the strain region distribution in the corner area provided in an embodiment of this disclosure;

[0053] Figure 4 This is a schematic diagram of the force distribution in the corner region of the flexible display substrate provided in this embodiment of the present disclosure;

[0054] Figure 5 This is a schematic diagram of a peripheral circuit arrangement provided in an embodiment of this disclosure;

[0055] Figure 6 This is a schematic diagram showing the dimensions of the semi-elliptical notch provided in an embodiment of this disclosure;

[0056] Figure 7 This is a schematic diagram of the structure of the first through hole provided in an embodiment of this disclosure;

[0057] Figure 8 This is a schematic diagram of the structure of the second through hole provided in an embodiment of this disclosure;

[0058] Figure 9 This is a schematic diagram showing the dimensions of the hollow structure provided in the embodiments of this disclosure;

[0059] Figure 10 This is a schematic diagram of the structure of the I-shaped hole provided in an embodiment of this application;

[0060] Figure 11 This is a schematic diagram of the structure of the flexible display panel provided in an embodiment of this disclosure;

[0061] Figure 12 This is a schematic diagram of the structure of the flexible display panel provided in an embodiment of this disclosure;

[0062] Figure 13 This is a schematic diagram showing the dimensions of the strip hole provided in an embodiment of this disclosure;

[0063] Figure 14 This is a schematic diagram of the layer hierarchy of a flexible display substrate provided in an embodiment of this disclosure;

[0064] Figure 15 This is a flowchart of a method for manufacturing a flexible display substrate according to an embodiment of the present disclosure. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0066] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0067] Figure 1 This is a schematic diagram of a region of a flexible display substrate provided in an embodiment of this disclosure. See also... Figure 1 The flexible display substrate includes a peripheral region 1 and a display region 2, with the peripheral region 1 surrounding the display region 2.

[0068] Figure 2 This is a partial structural schematic diagram of a flexible display substrate provided in an embodiment of this disclosure. Figure 2 As shown, the peripheral area 1 has multiple corner areas 10 (only one is shown in the figure). For example, a rectangular flexible display substrate has four corner areas. The rectangular flexible display substrate can be a right-angled flexible display substrate or a rounded-corner flexible display substrate; this embodiment does not limit the type of corner area. A corner area 10 is a region that includes a corner, such as a rectangular region with one corner as one corner, or a fan-shaped region with one corner as an arc; this embodiment also does not limit the shape of the corner area 10.

[0069] At least one of the corner regions 10 includes two first regions 11 and a second region 12 located between the two first regions 11; the first region 11 has a hollow structure 110, which allows the flexible display substrate to undergo tensile deformation when stretched, facilitating the bonding of the flexible display substrate. The second region 12 has at least one notch 120 located at the edge of the flexible display substrate, which is used to absorb the compression deformation of the corner region of the flexible display substrate and improve the wrinkles caused by compression deformation.

[0070] For example, each corner region 10 in the flexible display substrate is configured according to the above structure.

[0071] In this embodiment of the present disclosure, by providing a notch at the edge of the second region in the middle of the corner area of ​​the outer periphery of the flexible display substrate, when the outer periphery of the flexible display substrate is stretched downward and bonded to the frame of the installed terminal, the notch can absorb the shrinkage deformation requirement during bonding, and the deformation in the corner area can be offset by the notch, thereby improving the problem of wrinkles formed during bonding in the corner area and improving the bonding effect.

[0072] In addition, this bonding method allows for a deeper bonding depth in the outer area, resulting in a larger display area on the display panel and thus improving the screen-to-body ratio.

[0073] Figure 3 This is a schematic diagram of the strain region distribution in the corner area provided in an embodiment of this disclosure. See also... Figure 3 The strain regions in the corner area include: two compressive strain maxima A and two tensile strain maxima B.

[0074] like Figure 3 As shown, the tensile strain maximum region B and the compressive strain maximum region A overlap in the aforementioned first region 11, while in the second region 12, the two sides belong to the compressive strain maximum region A, and the middle part is a stress-free region.

[0075] It is worth noting that the flexible display substrate also has tensile strain electrode area C and compressive strain electrode area D, which are usually located in the display area of ​​the flexible display substrate.

[0076] Figure 4 This is a schematic diagram of the forces acting on the corner region of the flexible display substrate provided in an embodiment of this disclosure. See also... Figure 4 Due to the aforementioned strain distribution, the two sides of the second region 12 are subjected to significant compressive force (as shown by the arrows in the figure), which easily leads to wrinkles in this area. This disclosure improves the fit by arranging notches 120 in the second region to offset these wrinkles.

[0077] See you again Figure 2 The second region 12 includes:

[0078] Two first sub-regions 121 and one second sub-region 122, the second sub-region 122 being located between the two first sub-regions 121, the first sub-regions 121 and the second sub-region 122 being arranged along the extending direction of the edge of the flexible display substrate, and the notch 120 being located in the two first sub-regions 121.

[0079] For example, the second sub-region 122 is located at the center of the corner region 10.

[0080] The second sub-region 122 here is the aforementioned stress-free region, and the first sub-region 121 is the aforementioned region of maximum compressive strain, that is... Figure 4The area is subjected to greater compressive stress. Therefore, placing the notch 120 in the first sub-region 121 can alleviate or even eliminate the formation of wrinkles.

[0081] Since the second sub-region 122 is a stress-free area, it is a non-hollowed-out area, meaning that neither gaps nor hollow structures are provided in the second sub-region 122.

[0082] Since the second sub-region 122 has neither a notch nor a cutout structure, a circuit structure can be set in the second sub-region 122.

[0083] Figure 5 This is a schematic diagram of a peripheral circuit arrangement provided in an embodiment of this disclosure. See also... Figure 5 The flexible display substrate also includes peripheral circuitry 1220, at least a portion of which is located within the second region 12. Because the cutout structure 110 and notch 120 in the peripheral region 1 compress the space originally intended for the peripheral circuitry, placing at least a portion of the peripheral circuitry 1220 within the second region 12 can alleviate the compression of the space available for the peripheral circuitry.

[0084] For example, the peripheral circuitry 1220 includes a gate-on-array (GOA) circuit located in the second sub-region 122.

[0085] exist Figure 2 In the flexible display substrate shown, notch 120 is a semi-elliptical notch.

[0086] In other possible implementations, the notch 120 can be other shapes, such as a semi-circular notch, a rectangular notch, a trapezoidal notch, or an arc-shaped notch.

[0087] exist Figure 2 In the flexible display substrate shown, the major axis of the semi-elliptical notch intersects with the edge where the notch 120 is located and has an intersection point. This semi-elliptical notch has a good effect on improving wrinkles. Furthermore, by arranging the semi-elliptical notch in such a way that the major axis of the semi-elliptical notch intersects with the edge where the notch 120 is located, a larger number of semi-elliptical notches can be arranged in the first sub-region 121, further improving the wrinkle-improving effect.

[0088] For example, the major axis of the semi-elliptical notch is perpendicular to the edge where the notch 120 is located. For instance, for a right-angled rectangular flexible display substrate, the major axis of the semi-elliptical notch is perpendicular to the side where the notch 120 is located; for a rounded rectangular flexible display substrate, the major axis of the semi-elliptical notch is perpendicular to the tangent of the side where the notch 120 is located.

[0089] Of course, in other implementations, the minor axis of the semi-elliptical notch may intersect with the edge where the notch 120 is located; there are no restrictions on this.

[0090] Figure 6 This is a schematic diagram showing the dimensions of the semi-elliptical notch provided in an embodiment of this disclosure. See also... Figure 6 The major axis 2a of the semi-elliptical notch ( Figure 6 The value of 'a' (half of the major axis) in the figure ranges from 200 to 600 μm, and the value of 'b' (the minor axis of the semi-elliptical notch) ranges from 40 to 80 μm. When multiple notches exist, the minimum distance 'c' between adjacent semi-elliptical notches ranges from 5 to 40 μm. It should be noted that, for ease of observation, the distance between adjacent notches is not shown to scale in the figure.

[0091] It is worth noting that the aforementioned adjacent semi-elliptical gaps usually refer to adjacent semi-elliptical gaps within the same first sub-region 121.

[0092] For example, the major axis 2a of the semi-elliptical notch is 400 μm, the minor axis b of the semi-elliptical notch is 60 μm, and the minimum distance c between adjacent semi-elliptical notches is 25 μm.

[0093] like Figure 2 As shown, the hollow structure 110 includes multiple I-shaped holes. The structure of the I-shaped holes is briefly described below with reference to the accompanying drawings:

[0094] There are two types of I-shaped holes: a first through hole and a second through hole.

[0095] Figure 7 This is a schematic diagram of the structure of the first through hole provided in an embodiment of this disclosure. See also... Figure 7 The first through hole 111 includes a first strip-shaped main body 1111 and two trapezoidal parts 1112. The two trapezoidal parts 1112 are located at both ends of the first strip-shaped main body 1111, and the upper bottom of the trapezoidal parts 1112 is connected to the first strip-shaped main body 1111.

[0096] For example, the trapezoidal portion 212 is an isosceles trapezoid, and the upper base of the trapezoidal portion 212 coincides with the width side of the first strip-shaped main body portion 211.

[0097] The trapezoidal portion 212 is set as an isosceles trapezoid, and the upper base of the trapezoidal portion 212 coincides with one side of the first strip-shaped main body portion 211, so that the first through hole 21 is not only axially symmetrical, but also centrally symmetrical, which facilitates the neat arrangement of the first through hole 21 on the flexible display substrate.

[0098] Figure 8 This is a schematic diagram of the structure of the second through hole provided in an embodiment of this disclosure. See also... Figure 8The second through hole 112 includes a second strip-shaped main body 1121 and two strip-shaped branch portions 1122. The two strip-shaped branch portions 1122 are located at both ends of the second strip-shaped main body 1121, and the middle part of the strip-shaped branch portions 1122 is connected to the second strip-shaped main body 1121.

[0099] The difference between the second through hole 112 and the first through hole 111 is that the shapes of the ends of the through holes are different.

[0100] like Figure 8 As shown, the length direction of the strip-shaped branch 1122 is perpendicular to the length direction of the second strip-shaped main body 1121, and the strip-shaped branch 1122 is symmetrical about the second strip-shaped main body 1121.

[0101] The strip branch portion 1122 is arranged perpendicularly to the second strip main body portion 1121, and the strip branch portion 1122 is symmetrical about the second strip main body portion 1121. This is also to make the second through hole 112 not only axially symmetrical, but also centrally symmetrical, so as to facilitate the neat arrangement of the second through hole 112 on the flexible display substrate.

[0102] Figure 9 This is a schematic diagram showing the dimensions of the hollow structure provided in an embodiment of this disclosure. See also... Figure 9 Taking the second through hole as an example, the length a of the second strip-shaped main body 1121 ranges from 170 to 600 μm, the length b of the strip-shaped branch 1122 ranges from 60 to 160 μm, the width c of the second strip-shaped main body 1121 and the strip-shaped branch 1122 ranges from 4 to 50 μm, and the minimum distance d between adjacent I-shaped holes ranges from 80 to 200 μm.

[0103] For example, the length a of the second strip-shaped main body 1121 is 400 μm, the length b of the strip-shaped branch 1122 is 100 μm, the width c of the second strip-shaped main body 1121 and the strip-shaped branch 1122 is 30 μm, and the minimum distance d between adjacent I-shaped holes is 150 μm.

[0104] When the hollow structure includes a first through hole, the size of the first through hole is the same as the size of the aforementioned second through hole, that is:

[0105] The length of the first strip-shaped main body 1111 ranges from 170 to 600 μm, the length of the trapezoidal part 1112 (i.e., the length of the lower base of the trapezoidal part) ranges from 60 to 160 μm, the width of the first strip-shaped main body 1111 and the trapezoidal part 1112 (where the width of the trapezoidal part is also the height of the trapezoid) ranges from 4 to 50 μm, and the minimum distance between adjacent I-shaped holes ranges from 80 to 200 μm.

[0106] Figure 10 This is a schematic diagram of the structure of the I-shaped hole provided in an embodiment of this application. See also... Figure 10 The gap between two adjacent I-shaped holes is the bridge area 113, and the gap formed by four adjacent I-shaped holes is the island area 114.

[0107] like Figure 10 As shown, multiple island areas 114 are arranged in an array. Adjacent island areas 114 are connected by bridge areas 113. Each island area 114 is connected to four bridge areas 113. The four bridge areas 113 are connected to different sides of the island area 114, and the connection between the bridge area 113 and the island area 114 is located at the end of the side.

[0108] In this embodiment of the disclosure, wiring is arranged within the bridge area 113.

[0109] For example, only power lines (VDD) and common voltage lines (VSS) are arranged in the bridge area, and the GOA routing can be arranged in areas without perforated structures.

[0110] The width of bridge area 113, which is also the minimum distance d between adjacent I-shaped holes, ranges from 80 to 200 μm. The width of the trace is on the order of tens of μm, so the width of bridge area 113 can meet the trace requirements.

[0111] In addition to arranging peripheral circuits in the aforementioned second sub-region 112, peripheral circuits can also be arranged in the island region 114, thereby ensuring that there is enough space for the arrangement of peripheral circuits.

[0112] In this case, VDD, VSS, and GOA cabling can be installed simultaneously in the bridge area.

[0113] The island area 114 arranged according to the above dimensions is about 200μm×200μm, while the unit size of the GOA circuit is about 100μm×150um. Therefore, the above island area design can meet the arrangement requirements of the GOA circuit.

[0114] Figure 11 This is a schematic diagram of the structure of a flexible display panel provided in an embodiment of this disclosure. See also... Figure 11 In addition to the corner area 10, the outer area 1 also includes the central area 13 located between adjacent corner areas 10, and the central area 13 is provided with a hollow structure 110.

[0115] The hollow structure 110 in the central region 13 and the hollow structure 110 in the corner region 10 can be the same or different.

[0116] For example, the hollow structure 110 in the central region 13 and the hollow structure 110 in the corner region 10 both include I-shaped holes, and include I-shaped holes of the same shape and size.

[0117] For example, the through holes in the hollow structure 110 in the central region 13 and the hollow structure 110 in the corner region 10 may have different shapes or the same shape but different sizes, which will not be described in detail here.

[0118] It is worth noting that, in the outer area, the hollow structure 110 can be formed not only by the aforementioned I-shaped holes, but also by strip holes, or by a combination of I-shaped holes and strip holes.

[0119] In this embodiment, the peripheral area may include multiple concentric rings of I-shaped holes, such as five rings, but this embodiment does not limit this. In these multiple concentric rings of I-shaped holes, the arrangement directions of the I-shaped holes in adjacent rings are different, for example, the directions are perpendicular to each other.

[0120] See you again Figure 11 The display area 2 has a hollow structure 110. Within a unit area, the area of ​​the hollow structure 110 located in the display area 2 is greater than the area of ​​the hollow structure 110 located in the peripheral area 1.

[0121] The area of ​​the hollow structure 110 refers to the area enclosed by the inner wall of the hollow structure 110 on the surface of the flexible display substrate when the flexible display substrate is flattened and has not undergone deformation.

[0122] This means that the area of ​​the hollow structure located in the outer area 1 is smaller, which allows for more space in the outer area to accommodate peripheral circuits and wiring, for example... Figure 11 In the middle, the wiring m and the peripheral circuit n are arranged in the gap of the hollow structure of the outer area 1; the four corners can be designed with greater curvature to increase the bonding depth, thereby achieving the effect of hiding the outer area to the side and realizing the full-screen display effect.

[0123] Of course, such as Figure 11 As shown, wiring m can also be arranged in the gaps of the hollow structure at the edge of display area 1, which will not be elaborated here.

[0124] In this embodiment of the disclosure, the hollow structure 110 of the display area 2 includes a plurality of I-shaped holes, the plurality of I-shaped holes including one of a first through hole 111 and a second through hole 112.

[0125] The first through hole 111 includes a first strip-shaped main body 1111 and two trapezoidal parts 1112. The two trapezoidal parts 1112 are respectively located at both ends of the first strip-shaped main body 1111, and the upper bottom of the trapezoidal parts 1112 is connected to the first strip-shaped main body 1111.

[0126] The second through hole 112 includes a second strip-shaped main body portion 1121 and two strip-shaped branch portions 1122. The two strip-shaped branch portions 1122 are located at both ends of the second strip-shaped main body portion 1121, and the middle part of the strip-shaped branch portions 1122 is connected to the second strip-shaped main body portion 1121.

[0127] In this embodiment of the disclosure, the cutout structure 110 of the display area 2 and the cutout structure in the peripheral area 1 may be the same or different.

[0128] For example, the cutout structure 110 in the display area 2 and the cutout structure 110 in the corner area 10 or the central area 13 both include I-shaped holes, and include I-shaped holes of the same shape and size.

[0129] For example, the through holes in the cutout structure 110 of the display area 2 and the cutout structure 110 of the corner area 10 and the central area 13 may have different shapes or the same shape but different sizes.

[0130] See Figure 11 The through holes included in the hollow structure 110 of the display area 2 and the peripheral area 1 are both I-shaped holes, but the sizes of the I-shaped holes in the two areas are different. For example, the strip branch of the I-shaped hole in the display area 2 is longer, and the interval between adjacent I-shaped holes in the peripheral area 1 is larger. This makes the area of ​​the hollow structure 110 in the display area 2 larger than the area of ​​the hollow structure 110 in the peripheral area 1 per unit area.

[0131] That is to say, the length of the first strip-shaped main body portion 1111 or the second strip-shaped main body portion 1121 located in the display area 2 is greater than the length of the first strip-shaped main body portion 1111 or the second strip-shaped main body portion 1121 located in the peripheral area 1.

[0132] See Figure 12 The through holes in the hollow structure 110 of the display area 2 are I-shaped holes, while the through holes in the hollow structure 110 of the outer area 1 are strip-shaped holes, and the two have different shapes.

[0133] Using vias in peripheral area 1 allows for more space to be allocated for peripheral circuits and wiring.

[0134] Figure 13 This is a schematic diagram showing the dimensions of the strip hole provided in an embodiment of this disclosure. See also... Figure 13 The length 'a' of the strip hole ranges from 170 to 600 μm, the width 'c' of the strip hole ranges from 4 to 50 μm, and the minimum distance 'd' between adjacent strip holes ranges from 80 to 200 μm.

[0135] For example, the length a of the strip hole is 400 μm, the width c of the strip hole is 30 μm, and the minimum distance d between adjacent strip holes is 150 μm.

[0136] In display area 2, the length of the first strip-shaped main body 1111 or the second strip-shaped main body 1121 ranges from 250 to 800 μm;

[0137] The length of the trapezoidal portion 1112 or the strip-shaped branch portion 1122 ranges from 100 to 250 μm;

[0138] The width of the first strip-shaped main body 1111 and the trapezoidal part 1112, or the second strip-shaped main body 1121 and the strip-shaped branch part 1122, ranges from 4 to 50 μm.

[0139] The minimum distance between adjacent I-shaped holes ranges from 40 to 100 μm.

[0140] For example, the length of the first strip-shaped main body portion 1111 or the second strip-shaped main body portion 1121 is 500 μm;

[0141] The length of the trapezoidal portion 1112 or the strip-shaped branch portion 1122 is 180 μm;

[0142] The width of the first strip-shaped main body portion 1111 and the trapezoidal portion 1112, or the second strip-shaped main body portion 1121 and the strip-shaped branch portion 1122, is 30 μm;

[0143] The minimum distance between adjacent I-shaped holes is 70 μm.

[0144] See you again Figure 11 In display area 2, there are also bridge area 113 and island area 114. The bridge area 113 is arranged with wiring and the island area 114 is arranged with light-emitting structure.

[0145] For example, the area of ​​the island area 114 located in the display area 2 is smaller than the area of ​​the island area 114 located in the peripheral area 1, and the width of the bridge area 113 located in the display area 2 is smaller than the width of the bridge area 113 located in the peripheral area 1.

[0146] Among them, bridge area 113 is strip-shaped, and the width of bridge area 113 is the width of the strip.

[0147] Figure 14 This is a schematic diagram of the layer hierarchy of a flexible display substrate provided in an embodiment of this disclosure. See also... Figure 14 The flexible display substrate includes:

[0148] A flexible substrate 3, a display functional film layer 4 and a cover plate 5 are sequentially located on the flexible substrate 3, and the projection of the edges of the flexible substrate 3 and the cover plate 5 onto the plane where the surface of the display functional film layer 4 is located is outside the surface of the display functional film layer 4.

[0149] The cover plate 5 can be made of optically clear adhesive (OCA), such as positive or negative photoresist.

[0150] In related technologies, the outermost edge of the display functional film layer of a flexible display substrate is provided with a heat-affected zone and a dam to eliminate the heat effects of laser cutting. However, in this embodiment, the projections of the edges of the flexible substrate 3 and the cover plate 5 onto the plane containing the surface of the display functional film layer 4 are located outside the surface of the display functional film layer 4. That is, the flexible substrate 3 and the cover plate 5 extend outward relative to the display functional film layer 4. By replacing the original heat-affected zone and heat-affected dam with the extended flexible substrate 3 and cover plate 5, the structural complexity of the display functional film layer is simplified, facilitating its fabrication. Without the heat-affected zone and heat-affected dam, the outermost structure of the display functional film layer can be a waterproof dam (the structure in related technologies simultaneously has a waterproof dam and a heat-affected dam).

[0151] See you again Figure 14 The display functional film layer 4 includes: a buffer layer 41, an active layer 42, a gate insulating layer 43, a gate layer 44, a source-drain insulating layer 45, a source-drain layer 46, a first planarization layer 47, a spacer layer 48, a first encapsulation layer 49, an anode layer 410, a pixel defining layer 411, a light-emitting layer 412, a cathode layer 413, a second planarization layer 414, and a second cover plate 415.

[0152] Among them, the first planarization layer 47, the spacer layer 48, the first cover plate 49, and the cathode layer 413 form the aforementioned waterproof dam 6 in the outer area for waterproofing against oxygen corrosion.

[0153] For example, the buffer layer 41 may be composed of multiple sub-layers, such as Figure 13 This includes multiple sublayers, such as two inorganic sublayers and two organic sublayers. It is worth noting that the aforementioned flexible substrate 3 also serves as a buffer; therefore, the flexible substrate 3 and the buffer layer 41 can together form a buffer (BF).

[0154] For example, the active layer 42 can be a low-temperature polycrystalline silicon (LTPS) layer. LTPS has high mobility and good stability, which can meet the requirements of high-resolution displays.

[0155] For example, the gate insulating layer 43 can be an inorganic insulating layer, such as a silicon nitride (chemical formula: SiN) insulating layer, or an organic insulating layer, such as a ring resin insulating layer. Silicon nitride and ring resin have good insulating properties, ensuring the insulation of the gate insulating layer 43.

[0156] For example, the source-drain insulating layer 45 can be an inorganic insulating layer, such as a silicon nitride insulating layer, or an organic insulating layer, such as a ring-shaped resin insulating layer. Silicon nitride and ring-shaped resin have good insulation properties, ensuring the insulation of the source-drain insulating layer 45.

[0157] For example, the gate layer 44 can be a metal layer or an indium tin oxide layer. This ensures the stability of electrical signal transmission in the gate layer 44.

[0158] For example, the source / drain layer 46 can be a metal layer or an indium tin oxide layer. This ensures the stability of electrical signal transmission in the source / drain layer 46.

[0159] For example, the first planarization layer 47 and the second planarization layer 414 can be resin layers, and the resin has insulating properties to ensure the insulation of the second planarization layer 70.

[0160] For example, the spacer layer 48 can be an organic or inorganic insulating spacer layer.

[0161] For example, the anode layer 410 can be a metal layer. The cathode layer 413 can be an indium tin oxide thin film layer.

[0162] For example, the pixel defining layer 411 can be a hydrophobic material layer, such as a fluorinated polyimide or a fluorinated polymethyl methacrylate layer.

[0163] For example, the light-emitting layer 412 may include a hole transport layer, an organic light-emitting layer, and an electron transport layer stacked together.

[0164] For example, the first cover plate 49 and the second cover plate 415 can be encapsulated using a thin-film encapsulation (TFE) method to ensure the encapsulation effect.

[0165] This disclosure also provides a display panel, the display panel including as follows: Figures 1 to 14 The flexible display substrate described in any one of the images.

[0166] In this embodiment of the present disclosure, by providing a notch at the edge of the second region in the middle of the corner area of ​​the outer periphery of the flexible display substrate, when the outer periphery of the flexible display substrate is stretched downward and bonded to the frame of the installed terminal, the notch can absorb the shrinkage deformation requirement during bonding, and the deformation in the corner area can be offset by the notch, thereby improving the problem of wrinkles formed during bonding in the corner area and improving the bonding effect.

[0167] This disclosure also provides a display device, which includes the display panel as described above.

[0168] The display device in this embodiment can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0169] In this embodiment of the present disclosure, by providing a notch at the edge of the second region in the middle of the corner area of ​​the outer periphery of the flexible display substrate, when the outer periphery of the flexible display substrate is stretched downward and bonded to the frame of the installed terminal, the notch can absorb the shrinkage deformation requirement during bonding, and the deformation in the corner area can be offset by the notch, thereby improving the problem of wrinkles formed during bonding in the corner area and improving the bonding effect.

[0170] Figure 15 This is a flowchart illustrating a method for fabricating a flexible display substrate according to an embodiment of this disclosure. Figure 15 As shown, the manufacturing method includes:

[0171] Step S11: Provide a flexible substrate.

[0172] Step S12: Form a display functional film layer on the flexible substrate.

[0173] The display functional film layer includes at least a light-emitting element, peripheral circuitry, and wiring.

[0174] Step S13: Form a hollow structure and a notch on a flexible substrate with a display functional layer to obtain a flexible display substrate.

[0175] The flexible display substrate includes a display area and a peripheral area, with the peripheral area surrounding the display area. The hollow structure and notch design of the display area and peripheral area are described in [reference needed]. Figures 1 to 13 Any one of them.

[0176] In this embodiment of the present disclosure, by providing a notch at the edge of the second region in the middle of the corner area of ​​the outer periphery of the flexible display substrate, when the outer periphery of the flexible display substrate is stretched downward and bonded to the frame of the installed terminal, the notch can absorb the shrinkage deformation requirement during bonding, and the deformation in the corner area can be offset by the notch, thereby improving the problem of wrinkles formed during bonding in the corner area and improving the bonding effect.

[0177] For example, a patterning process can be used to form the cutout structure and the notch. The cutout structure and the notch penetrate through the display functional layer and the flexible substrate.

[0178] Optionally, prior to step S13, the method further includes forming a cover plate.

[0179] A cover plate covers the display functional film layer to provide protection for it. Exemplarily, the cover plate may be made of optical adhesive.

[0180] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A flexible display substrate, characterized in that, The flexible display substrate includes a peripheral region (1) and a display region (2), wherein the peripheral region (1) surrounds the display region (2); The outer area (1) has a plurality of corner areas (10), at least one of the corner areas (10) includes two first areas (11) and a second area (12) located between the two first areas (11). The first region (11) has a hollow structure (110), and the second region (12) has at least one notch (120) located at the edge of the flexible display substrate. The second region (12) includes: Two first sub-regions (121) and one second sub-region (122), the second sub-region (122) being located between the two first sub-regions (121), the first sub-regions (121) and the second sub-regions (122) being arranged along the extension direction of the edge of the flexible display substrate, and the notch (120) being located in the two first sub-regions (121). Each of the two first sub-regions (121) includes multiple notches (120); the second sub-region (122) does not have notches or hollow structures, and the second sub-region (122) is a stress-free area.

2. The flexible display substrate according to claim 1, characterized in that, The notch (120) can be a semi-elliptical notch, a semi-circular notch, a rectangular notch, a trapezoidal notch, or an arc notch.

3. The flexible display substrate according to claim 2, characterized in that, The long axis of the notch intersects the edge where the notch (120) is located and has an intersection point.

4. The flexible display substrate according to claim 3, characterized in that, The notch (120) is a semi-elliptical notch.

5. The flexible display substrate according to claim 4, characterized in that, The major axis of the semi-elliptical notch ranges from 200 to 600 μm; The minor axis of the semi-elliptical notch ranges from 40 to 80 μm. When the second region (12) has multiple semi-elliptical notches, the minimum distance between adjacent semi-elliptical notches ranges from 5 to 40 μm.

6. The flexible display substrate according to any one of claims 1 to 5, characterized in that, The second sub-region (122) is located at the center of the corner region (10).

7. The flexible display substrate according to claim 6, characterized in that, The flexible display substrate also includes peripheral circuitry (1220). At least a portion of the peripheral circuit (1220) is located within the second region (12).

8. The flexible display substrate according to claim 7, characterized in that, The peripheral circuit (1220) includes a GOA circuit located within the second sub-region (122).

9. The flexible display substrate according to any one of claims 1 to 5, 7 to 8, characterized in that, The hollow structure (110) includes a plurality of I-shaped holes, the plurality of I-shaped holes including at least one of a first through hole (111) and a second through hole (112); The first through hole (111) includes a first strip-shaped main body (1111) and two trapezoidal parts (1112). The two trapezoidal parts (1112) are located at both ends of the first strip-shaped main body (1111), and the upper bottom of the trapezoidal parts (1112) is connected to the first strip-shaped main body (1111). The second through hole (112) includes a second strip-shaped main body (1121) and two strip-shaped branch portions (1122). The two strip-shaped branch portions (1122) are located at both ends of the second strip-shaped main body (1121), and the middle part of the strip-shaped branch portion (1122) is connected to the second strip-shaped main body (1121).

10. The flexible display substrate according to claim 9, characterized in that, The length of the first strip-shaped main body (1111) or the second strip-shaped main body (1121) ranges from 170 to 600 μm; The length of the trapezoidal portion (1112) or the strip-shaped branch portion (1122) ranges from 60 to 160 μm; The width of the first strip-shaped main body (1111) and the trapezoidal part (1112), or the second strip-shaped main body (1121) and the strip-shaped branch part (1122), ranges from 4 to 50 μm; The minimum distance between adjacent I-shaped holes ranges from 80 to 200 μm.

11. The flexible display substrate according to claim 9, characterized in that, The gap between two adjacent I-shaped holes is the bridge area (113), and the gap formed by four adjacent I-shaped holes is the island area (114). The wiring is arranged in the bridge area (113), and the peripheral circuit is arranged in the island area (114).

12. The flexible display substrate according to any one of claims 1 to 5, 7 to 8, and 10 to 11, characterized in that, The display area (2) has a hollow structure (110). Within a unit area, the area of ​​the hollow structure (110) located in the display area (2) is greater than the area of ​​the hollow structure (110) located in the outer area (1).

13. The flexible display substrate according to claim 12, characterized in that, The hollow structure (110) of the display area (2) includes a plurality of I-shaped holes, the plurality of I-shaped holes including at least one of a first through hole (111) and a second through hole (112); The first through hole (111) includes a first strip-shaped main body (1111) and two trapezoidal parts (1112). The two trapezoidal parts (1112) are located at both ends of the first strip-shaped main body (1111), and the upper bottom of the trapezoidal parts (1112) is connected to the first strip-shaped main body (1111). The second through hole (112) includes a second strip-shaped main body (1121) and two strip-shaped branch portions (1122). The two strip-shaped branch portions (1122) are located at both ends of the second strip-shaped main body (1121), and the middle part of the strip-shaped branch portion (1122) is connected to the second strip-shaped main body (1121).

14. The flexible display substrate according to claim 13, characterized in that, The length of the first strip-shaped main body portion (1111) or the second strip-shaped main body portion (1121) located in the display area (2) is greater than the length of the first strip-shaped main body portion (1111) or the second strip-shaped main body portion (1121) located in the peripheral area (1).

15. The flexible display substrate according to claim 14, characterized in that, Within the display area (2), the length of the first strip-shaped main body (1111) or the second strip-shaped main body (1121) ranges from 250 to 800 μm; The length of the trapezoidal portion (1112) or the strip branch portion (1122) ranges from 100 to 250 μm; The width of the first strip-shaped main body (1111) and the trapezoidal part (1112), or the second strip-shaped main body (1121) and the strip-shaped branch part (1122), ranges from 4 to 50 μm; The minimum distance between adjacent I-shaped holes ranges from 40 to 100 μm.

16. The flexible display substrate according to claim 13, characterized in that, The display area (2) has a bridge area (113) and an island area (114) between the I-shaped holes. The area of ​​the island area (114) located in the display area (2) is smaller than the area of ​​the island area (114) located in the outer area (1), and the width of the bridge area (113) located in the display area (2) is smaller than the width of the bridge area (113) located in the outer area (1).

17. The flexible display substrate according to any one of claims 1 to 5, 7 to 8, 10 to 11, and 13 to 16, characterized in that, The flexible display substrate includes: The flexible substrate (3), the display functional film layer (4) and the cover plate (5) are sequentially located on the flexible substrate (3), and the projection of the edges of the flexible substrate (3) and the cover plate (5) onto the plane where the surface of the display functional film layer (4) is located outside the surface of the display functional film layer (4).

18. A display panel, characterized in that, The display panel includes a flexible display substrate as described in any one of claims 1 to 17.

19. A display device, characterized in that, The display device includes the display panel as described in claim 18.

Images