WO2022012259A1 - 柔性显示装置及电子设备 - Google Patents

柔性显示装置及电子设备 Download PDF

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Publication number
WO2022012259A1
WO2022012259A1 PCT/CN2021/100726 CN2021100726W WO2022012259A1 WO 2022012259 A1 WO2022012259 A1 WO 2022012259A1 CN 2021100726 W CN2021100726 W CN 2021100726W WO 2022012259 A1 WO2022012259 A1 WO 2022012259A1
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WO
WIPO (PCT)
Prior art keywords
layer
area
crack
display device
flexible display
Prior art date
Application number
PCT/CN2021/100726
Other languages
English (en)
French (fr)
Inventor
吴永凯
李仁佑
樊浩原
李旭伟
杨峰
杭宗秋
戴明
赵言
赵天龙
谈耀宏
丛晓东
陈启程
王笑鸽
Original Assignee
京东方科技集团股份有限公司
绵阳京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 京东方科技集团股份有限公司, 绵阳京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/789,291 priority Critical patent/US20230049009A1/en
Publication of WO2022012259A1 publication Critical patent/WO2022012259A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a flexible display device and an electronic device.
  • Flexible display products have become the favored objects of electronic devices such as mobile phones and tablet computers.
  • Flexible display products can be designed according to different shape models of electronic devices to provide different surface display requirements.
  • the purpose of the present disclosure is to provide a flexible display device and an electronic device with good quality and reliability.
  • a first aspect of the present disclosure provides a flexible display device, the flexible display device includes a display substrate, a polarizer and a first optical adhesive layer stacked in sequence; the flexible display device has a display area and a a peripheral area, the peripheral area includes a first side area extending in a first direction, a second side area extending in a second direction, and located on the first side area and the second side Arc corner areas between areas;
  • the arc-shaped corner area has a first side, an inner arc side, a second side and an outer arc side which are connected end to end in sequence, the first side is connected to the first side area, and the second side connected with the second side area;
  • the arc-shaped corner area includes a first corner area with the first side and a second corner area with the second side, and the arc-shaped corner area is The center position is located in the first corner area;
  • the arc-shaped corner area can be bent, and the bending angle of the first corner area is greater than the bending angle of the second corner area; in the first corner area, all the The outer contour of the orthographic projection of the polarizer and/or the first optical adhesive layer on the reference plane is located outside the outer contour of the orthographic projection of the display substrate on the reference plane;
  • the display substrate includes an anti-crack base, an anti-crack retaining wall and a plurality of anti-crack blocks at least located in the first corner area;
  • the anti-crack retaining wall is formed on the anti-crack base and located on the the outer side of the display area;
  • the plurality of anti-crack blocking blocks are formed on the anti-cracking substrate and located on the side of the anti-cracking blocking wall away from the display area;
  • the first direction intersects the second direction;
  • the reference plane is a plane parallel to the first direction and the second direction.
  • the anti-cracking base, the anti-cracking retaining wall and the anti-cracking blocking block are further located in the second corner area;
  • the plurality of anti-crack blocks are divided into at least two rows of anti-crack block groups, each row of the anti-crack block groups includes a plurality of parts located in the arc-shaped corner regions of the display substrate according to the reference
  • the anti-crack stopper is arranged by the outer contour of the orthographic projection on the plane; wherein,
  • the middle regions of the adjacent crack prevention blocks in each row of the crack prevention block groups are in contact, and there are gaps between the regions on both sides thereof;
  • the anti-crack blocks in one row correspond to the gaps between adjacent anti-crack blocks in the other row.
  • the orthographic projection of the anti-cracking stopper on the reference plane includes a first point and a second point that are farthest away;
  • the first point and the second point of the anti-crack block in one row and the contact point between the adjacent anti-crack blocks in the other row are located on the same straight line .
  • an orthographic projection shape of the anti-cracking stopper in the reference plane is a quadrilateral; a portion of the display substrate located in the arc-shaped corner region is in the reference plane
  • the outer contour of the orthographic projection on is an arc line;
  • the quadrilateral has a first diagonal line and a second diagonal line, two ends of the first diagonal line are the first point and the second point respectively, and the length of the first diagonal line is is greater than the length of the second diagonal; wherein, the included angle between the first diagonal and the normal of the tangent point corresponding to the first diagonal in the outer arc edge is an acute angle.
  • the included angle between the first diagonal line and the normal line of the tangent point corresponding to the first diagonal line in the arc is 5° to 30° °.
  • the quadrilaterals are symmetrically arranged with respect to the first diagonal line.
  • the orthographic projection shape of the crack prevention block in the crack prevention block group closest to the outer arc edge in the reference plane is a rhombus.
  • the anti-cracking substrate, the anti-cracking blocking block and the anti-cracking blocking wall are all composed of at least one organic film layer.
  • the display substrate in the display area, includes a flexible substrate, and the flexible substrate includes a first organic substrate layer, an inorganic barrier layer, and a second organic substrate layer stacked in sequence and inorganic buffer layer;
  • the crack-resistant substrate is integrally formed with at least one of the first organic substrate layer and the second organic substrate layer.
  • the display substrate further includes a driving circuit layer and a light emitting structure layer located in the display area, the driving circuit layer is disposed on the inorganic buffer layer, and the light emitting structure The layer is arranged on the side of the driving circuit layer away from the inorganic buffer layer;
  • the driving circuit layer includes a thin film transistor, and the light emitting structure layer includes a first planarization layer covering the thin film transistor, formed on the A via electrode on the planarization layer, a second planarization layer covering the via electrode, and an anode and a pixel definition layer sequentially formed on the second planarization layer, the anode is connected to the via hole
  • the transfer electrode is electrically connected, the transfer electrode is electrically connected to the thin film transistor through a via hole, the pixel definition layer is provided with a pixel opening exposing the anode, the first planarization layer, the second
  • the materials of the planarization layer and the pixel definition layer are organic materials;
  • the flexible display device further includes a touch substrate located at least in the display area, the touch substrate is located on the side of the polarizer close to the display substrate, and the touch substrate includes a touch substrate located on the light emitting structure layer away from all a touch electrode layer of the driving circuit layer and an organic protective layer located on the side of the touch electrode layer away from the display substrate;
  • the anti-crack retaining wall and at least one of the first planarization layer, the second planarization layer, the pixel definition layer and the organic protective layer are disposed in the same layer and are disconnected from each other;
  • the anti-crack stopper and at least one of the first planarization layer, the second planarization layer, the pixel definition layer and the organic protective layer are disposed in the same layer and disconnected from each other.
  • the number of layers of the organic film layers in the anti-crack retaining wall and the anti-crack blocking block are the same and correspond one-to-one.
  • a surface of the anti-cracking block that is far from the anti-cracking base is flush with a surface of the anti-cracking wall that is far away from the anti-cracking base.
  • the thickness of the anti-crack retaining wall is 4 ⁇ m to 5 ⁇ m.
  • the display substrate further includes a first encapsulation barrier wall and a second encapsulation barrier wall located in the peripheral region and surrounding the display region, the first encapsulation barrier wall being located in the peripheral region and surrounding the display region.
  • the anti-cracking retaining wall is located on the side close to the display area
  • the second packaging retaining wall is located on the side of the first packaging retaining wall close to the display area
  • the height of the first packaging retaining wall is greater than the height of the second encapsulation retaining wall;
  • the first encapsulation retaining wall and at least one of the second planarization layer and the pixel definition layer are disposed in the same layer and disconnected from each other;
  • the second encapsulation barrier wall and at least one of the second planarization layer and the pixel definition layer are disposed in the same layer and disconnected from each other.
  • the at least two rows of anti-crack block groups are located in the first corner area; and a portion of the at least two rows of anti-crack block groups that are far from the display area A set of crack stops extends to the second corner region.
  • the two rows of the anti-cracking block groups extend to the second corner area.
  • the anti-crack retaining wall is provided with multiple circles, and there is a gap between two adjacent circles of the anti-crack retaining wall;
  • a plurality of circles of the anti-cracking retaining walls are located in the first corner area, and a part of the plurality of circles of the anti-cracking retaining walls far from the display area extends to the second corner area, the first side region and the second side region.
  • the outer contours of the orthographic projection of the polarizer and the first optical adhesive layer on the reference plane are both located at the location where the display substrate is located.
  • the outer contour of the orthographic projection on the reference plane, and the outer contour of the orthographic projection of the polarizer on the reference plane coincides with the outer contour of the orthographic projection of the first optical adhesive layer on the reference plane.
  • the first corner region includes a first subregion and a second subregion located in the first subregion and adjacent to the first side region, wherein the arc The center position of the corner area is located in the first sub-area;
  • the first sub-region there is a first distance between the outer contour of the orthographic projection of the polarizer on the reference plane and the outer contour of the orthographic projection of the display substrate on the reference plane;
  • the second distance is greater than the first distance.
  • the first corner area further includes a third sub-area and a fourth sub-area; the third sub-area is located in the first sub-area and close to the second corner area one side, the fourth sub-region is located on the side of the second sub-region close to the first side region,;
  • the third distance is smaller than the first distance
  • the fourth distance is smaller than the second distance
  • the outer contour of the orthographic projection of the polarizer and the first optical adhesive layer on the reference plane is related to the display substrate. Coincidence of the outer contours of the orthographic projections on the reference plane.
  • a cover plate is further included, located on a side of the first optical adhesive layer away from the polarizer;
  • the outer contour of the orthographic projection of the polarizer and the first optical adhesive layer on the reference plane is located within or coincides with the outer contour of the orthographic projection of the cover plate on the reference plane.
  • a second aspect of the present disclosure also provides an electronic device, which includes the flexible display device described in any one of the above.
  • FIG. 1 shows a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure
  • FIG. 2 shows a schematic structural diagram of an arc-shaped corner area in a flexible display device according to an embodiment of the present disclosure
  • FIG. 3 shows a schematic structural diagram of the flexible display device according to an embodiment of the present disclosure in which the edge is in a bent state
  • FIG. 4 shows a schematic structural diagram of the flexible display device according to an embodiment of the present disclosure under a viewing angle
  • FIG. 5 shows a schematic diagram of cracks generated when the flexible display device according to an embodiment of the present disclosure is bent
  • FIG. 6 shows a schematic structural diagram of an arc-shaped corner area in a flexible display device according to another embodiment of the present disclosure
  • FIG. 7 shows a schematic structural diagram of an arc-shaped corner area in a flexible display device according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram showing the relationship between the crack direction and the normal of its corresponding part during the bending process of the arc-shaped corner area of the flexible display device according to an embodiment of the present disclosure
  • Figure 9 shows a schematic cross-sectional view along the D-D line shown in Figure 1;
  • Figure 10 shows a schematic cross-sectional view along the Q-Q line shown in Figure 7;
  • Figure 11 shows a schematic cross-sectional view along the R-R line shown in Figure 7;
  • FIG. 12 to FIG. 14 are schematic diagrams respectively showing the crack prevention block according to an embodiment of the present disclosure to prevent crack extension.
  • Flexible display device 1a, display substrate; 1b, polarizer; 1c, first optical adhesive layer; 1d, cover plate; 1e, touch substrate; 10, display area; 101, flexible substrate; 101a, first organic Base layer; 101b, inorganic barrier layer; 101c, second organic base layer; 101d, inorganic buffer layer; 102, thin film transistor; 102a, active layer; 102b, gate electrode, 102c, source electrode; 102d, drain electrode; 103 103a, the first plate; 103b, the second plate; 104, the gate insulating layer; 105, the capacitor insulating layer; 106, the interlayer dielectric layer; 107, the passivation layer; 108, the first planarization layer 109, transfer electrode; 110, second planarization layer; 111, anode; 112, pixel definition layer; 113, organic light-emitting layer; 114, cathode; 115, encapsulation layer; 115a, first inorganic encapsulation layer; organic en
  • the terms “installed”, “connected” and “connected” should be construed in a broad sense. For example, it may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate piece, or an internal communication between two elements.
  • installed should be construed in a broad sense. For example, it may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediate piece, or an internal communication between two elements.
  • the term “same layer arrangement” is used to mean that two layers, components, components, elements or sections may be formed by the same patterning process, and that the two layers, components, components , elements or parts are generally formed of the same material.
  • patterning process generally includes steps of photoresist coating, exposure, development, etching, and photoresist stripping.
  • one-shot patterning process means a process of forming patterned layers, features, members, etc. using one mask.
  • the flexible display device 1 has a display area 10 and a peripheral area 20 arranged around the display area 10 .
  • the shape of the orthographic projection of the flexible display device 1 on the reference plane in the embodiment of the present disclosure may be similar to a rectangle, that is, the flexible display device 1 may include two opposing first One side area 20a, two second side areas 20b opposite in the first direction Y, and four arc-shaped corner areas 20c.
  • first direction Y in the embodiment of the present disclosure may intersect with the second direction X, and optionally, the first direction Y and the second direction X are orthogonal.
  • reference plane mentioned in the embodiments of the present disclosure is a plane parallel to the first direction Y and the second direction X.
  • the first side area 20a and the second side area 20b may be rectangular; but not limited thereto, other shapes may also be used; and as shown in FIG. 2, the arc-shaped corner areas 20c have end-to-end connected
  • the first side 201, the inner arc side 202, the second side 203 and the outer arc side 204, the first side 201 is connected with the first side area 20a, and the second side 203 is connected with the second side area 20b.
  • first side area 20a and the second side area 20b in the embodiment of the present disclosure may be rectangular
  • the second side 203 connecting the regions 20b may be straight, but not limited thereto, the first side 201 and the second side 203 may be determined according to the shapes of the first side region 20a and the second side region 20b.
  • the edge of the flexible display device 1 can be bent to form a bending area C as shown in FIG. 3 , and the bending area C may include the first side area 20a as shown in FIG. 1 and an arc shape
  • the corner area 20c may also include a portion of the display area 10 close to the first side area 20a and the arc-shaped corner area 20c, so as to realize curved display.
  • the first side region 20a of the flexible display device 1 can be bent in a direction away from the display side of the flexible display device 1 , and it should be understood that the first side region 20a is bent in a direction away from the display side of the flexible display device 1 .
  • the arc-shaped corner region 20c and the display region 10 are also bent in a direction away from the display side of the flexible display device 1 along with the first side region 20a.
  • the corner area of the flexible display device 1 in the embodiment of the present disclosure is in an arc shape
  • the stress on the arc-shaped corner area 20c will be much greater than that on the first side area 20a. Therefore, cracks are likely to occur in the arc-shaped corner region 20c, thereby affecting product performance and product reliability.
  • the arc-shaped corner region 20c is also prone to cracks under external pressure.
  • the arc-shaped corner area 20c of the embodiment of the present disclosure may include a first corner area A having a first side 201 and a second corner area B having a second side 203 , that is, the first corner area A is close to the first side area 20a, and the second corner area B is close to the second side area 20b; wherein, as shown in FIG. 2, the first corner area A and the second corner area B may share a straight side, and the first corner area Region A may include a portion of the inner arc edge 202 and a portion of the outer arc edge 204 , and the second corner region B may include another portion of the inner arc edge 202 and another portion of the outer arc edge 204 .
  • the center position of the arc-shaped corner area 20c is located in the first corner area A.
  • the first corner area A is closer to the first side area 20a than the second corner area B, as shown in FIG. 3 , in the first side area 20a of the flexible display device 1
  • the bending angle ⁇ 1 of the first corner area A is greater than the bending angle ⁇ 2 of the second corner area B; this bending angle can be the first corner area A, the second corner area B
  • the dotted line Q in FIG. 3 is located in this reference plane.
  • the first side region 20a of the flexible display device 1 when the first side region 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1, it can be seen from the experimental analysis that the overall first corner region A is more affected than the second corner region B as a whole. The stress is higher, that is, the first corner region A is more prone to cracks than the second corner region B.
  • the embodiment of the present disclosure improves the structure located at the arc-shaped corner area 20c in the flexible display device 1, as follows:
  • the flexible display device 1 may include a display substrate 1a, a polarizer 1b, and a first optical adhesive layer 1c stacked in sequence.
  • the display substrate 1a, the polarizer 1b, and the first optical adhesive layer 1c Located in the display area 10 and the peripheral area 20 .
  • the display substrate 1a can be an OLED (Organic Light-Emitting Diode, organic light emitting diode) display, but is not limited thereto.
  • the flexible display device 1 may further include a cover plate 1d, and the cover plate 1d is located on the side of the first optical adhesive layer 1c away from the polarizer 1b. Specifically, the cover plate 1d can be bonded to the polarizer 1b through the first optical adhesive layer 1c.
  • the outer contour of the orthographic projection of the display substrate 1a, the polarizer 1b and the first optical adhesive layer 1c on the reference plane needs to be located within the outer contour of the orthographic projection of the cover plate 1d on the reference plane; it should be understood that , the display substrate 1a, polarizer 1b and the first optical adhesive layer 1c have tolerances in incoming materials, cutting, etc., but the slight decoration of the display substrate 1a, polarizer 1b and the first optical adhesive layer 1c does not affect the flexible display.
  • the outer shape of the device 1, because the outer shape of the flexible display device 1 is mainly embodied on the cover plate 1d.
  • the outer contour of the orthographic projection of the polarizer 1b and the first optical adhesive layer 1c on the reference plane may also coincide with the outer contour of the orthographic projection of the cover plate 1d on the reference plane, depending on the specific situation.
  • the flexible display device 1 Since the flexible display device 1 is a flat plate structure before being bent; therefore, when the first side region 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1, the flexible display device 1 is mainly affected by tensile stress 5 , the surfaces of the display substrate 1a, the polarizer 1b and the first optical adhesive layer 1c are all subject to tensile stress F; wherein, the polarizer 1b and the first optical adhesive layer 1c in the embodiment of the present disclosure are made of organic insulating materials Materials, since the polarizer 1b and the first optical adhesive layer 1c are made of organic insulating materials, the polarizer 1b and the first optical adhesive layer 1c have good flexibility and are not prone to breakage during the bending process; while the display substrate 1a It is usually formed of a variety of materials, such as inorganic insulating materials, organic insulating materials and metal materials, etc.
  • inorganic insulating materials are hard and brittle, during the above bending process, the inorganic insulating layer in the display substrate 1a is subjected to After tensile stress, it is easy to break, especially the inorganic insulating layer at the arc-shaped corner region 20c. After the crack is generated, with the stress release, it can extend to other film layers and display regions to form crack E.
  • the outer contour of the orthographic projection of the polarizer 1b and/or the first optical adhesive layer 1c on the reference plane is located outside the outer contour of the orthographic projection of the display substrate 1a on the reference plane;
  • the polarizer 1b and/or the first optical adhesive layer 1c at the first corner area A are first subjected to surface tensile stress of the product, thereby protecting the display substrate 1a
  • the purpose is to relieve the display substrate 1a located in the first corner region A from being prone to cracks during bending, thereby alleviating the proneness to cracks during bending of the entire arc-shaped corner region 20c, and improving product yield and reliability.
  • the outer contour of the orthographic projection of the polarizer 1b and the first optical adhesive layer 1c on the reference plane can be located outside the outer contour of the orthographic projection of the display substrate 1a on the reference plane; In order to further protect the display substrate 1a, the first corner region A is prone to cracks when it is bent. Further, the outer contour of the orthographic projection of the polarizer 1b on the reference plane may be coincident with the outer contour of the orthographic projection of the first optical adhesive layer 1c on the reference plane, so as to reduce the design difficulty.
  • the first corner area A may include a first sub-area A1 and a second sub-area A2 located in the first sub-area A1 and close to the first side area 20a, wherein, The center of the arc-shaped corner area 20c is located in the first sub-area A1; experimental analysis shows that when the first side area 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1, the second sub-area The stress on A2 is greater than the stress on the first sub-region A1. Therefore, in order to save the space occupied by the polarizer 1b and reserve more design space for other designs, the polarizer 1b can be placed in a position with greater stress.
  • the distance beyond the edge of the display substrate 1a is larger, and the distance beyond the edge of the display substrate 1a is smaller at the position where the stress is small; that is, in the first sub-area A1, the outer contour of the orthographic projection of the polarizer 1b on the reference plane is the same as There is a first distance between the outer contours of the orthographic projection of the display substrate 1a on the reference plane; in the second sub-area A2, the outer contour of the orthographic projection of the polarizer 1b on the reference plane and the outer contour of the orthographic projection of the display substrate 1a on the reference plane. There is a second distance between the outer contours of the orthographic projection; wherein, the second distance is greater than the first distance.
  • the first corner area A may further include a third sub-area A3 and a fourth sub-area A4; the third sub-area A3 is located on the side of the first sub-area A1 close to the second corner area B, The four sub-areas A4 are located on the side of the second sub-area A2 close to the first side area 20a.
  • the first side area 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1.
  • the stress on the third sub-region A3 is less than that on the first sub-region A1, and the stress on the fourth sub-region A4 is less than that on the second sub-region A2; in order to further save the space occupied by the polarizer 1b, it is assumed that The purpose of other designs is to reserve more design space; in the embodiment of the present disclosure, in the third sub-area A3, the outer contour of the orthographic projection of the polarizer 1b on the reference plane is the same as that of the display substrate 1a on the reference plane.
  • the distance of the polarizer 1b beyond the edge of the display substrate 1a can be changed according to the changing trend of stress, so that the polarizer 1b can protect the display substrate 1a in the first corner area A while saving the cost of the polarizer 1b. Take up space for the purpose of reserving more design space for other designs.
  • the position where the stress is the largest in the third sub-region A3 is the position connected to the first sub-area A1
  • the position with the largest stress in the first sub-area A1 is the position connected with the second sub-area A2
  • the position with the largest stress in the first sub-area A1 is located at the arc-shaped corner
  • the position with the greatest stress in the second sub-area A2 is the position connected to the fourth sub-area A4
  • the position with the greatest stress in the fourth sub-area A4 is the position in the second sub-area A2.
  • the first, second, third and fourth distances refer to the distances of the polarizer 1b beyond the edge of the display substrate 1a at the positions with the greatest stress in each sub-region.
  • the distance of the polarizer 1b beyond the edge of the display substrate 1a gradually increases or decreases, for example: from the first sub-region A1 where the stress is the largest From the position to the position where the stress of the second sub-area A2 is the largest, the distance of the polarizer 1b beyond the edge of the display substrate 1a gradually increases.
  • the polarizer 1b when the first side region 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1, since the stress on the second corner region B is relatively small, cracks are not easily generated there.
  • the purpose of further saving the space occupied by the polarizer 1b is to reserve more design space for other designs; in the second corner area B, as shown in FIG. 6, the polarizer 1b and the first optical adhesive layer 1c are in the reference
  • the outer contour of the orthographic projection on the plane may coincide with the outer contour of the orthographic projection of the display substrate 1a on the reference plane.
  • the outer contour of the orthographic projection of the polarizer 1b and the first optical adhesive layer 1c on the reference plane may also exceed the outer contour of the orthographic projection of the display substrate 1a on the reference plane, As the case may be.
  • the present disclosure can not only improve the situation that cracks are prone to occur in the arc-shaped corners by changing the size of the polarizer 1b and/or the first optical adhesive layer 1c, but also improve the display substrate 1a in the arc-shaped corners by improving the
  • the structure of the zone can be improved to improve the situation that is prone to cracks; the details are as follows:
  • the display substrate 1 a may include a crack-preventing base 205 , a crack-preventing retaining wall 206 and a plurality of crack-preventing blocks 207 located at least in the first corner area A; the crack-preventing retaining wall 206 is formed on the anti-crack substrate 205 and is located outside the display area 10; It should be noted that, as shown in FIG. 7 , the anti-cracking base 205 , the anti-cracking blocking wall 206 and the anti-cracking blocking block 207 may also be located in the second corner area B. As shown in FIG.
  • the crack prevention block 207 and the crack prevention wall 206 can be provided to block cracks to prevent them from extending to the display area, thereby avoiding problems such as black spots in the display area, and improving product reliability and yield.
  • the arrangement of the plurality of anti-crack blocks 207 according to certain requirements can not only achieve the purpose of blocking cracks, but also divert the cracks, so as to further relieve the cracks from extending to other film layers or display areas.
  • the plurality of crack prevention blocks 207 in the embodiment of the present disclosure may be divided into at least two rows of crack prevention block groups, and each row of crack prevention block groups includes a plurality of crack prevention block groups located in arcs according to the display substrate 1a
  • the anti-crack blocking blocks 207 are arranged by the outer contour of the orthographic projection of the part of the shaped corner area 20c on the reference plane; wherein, the middle areas of the adjacent anti-cracking blocking blocks 207 in each row of anti-crack blocking blocks are in contact, and There are gaps between the areas on both sides; that is to say, between the adjacent anti-crack blocks 207 in each row of anti-crack block groups is a weak area.
  • the anti-crack block 207 in one row corresponds to the gap between the adjacent anti-crack blocks 207 in the other row, so that the design makes After the crack E passes through the weak area of a row of anti-crack block groups, it just encounters the anti-crack block 207 of the next row of anti-crack block groups, which can completely prevent the crack E from continuing to extend to the display area, as shown in Figure 12 shown.
  • some cracks have relatively large stress release energy, which can be bifurcated on the sidewall of the anti-crack block 207 to disperse the energy.
  • the energy is small, even if it passes through one row of anti-crack block groups, it just encounters the non-weak area of the next row of anti-crack block groups, and the anti-crack blocks 207 in the next row can completely block cracks.
  • each row of crack prevention block groups may be in point contact, but not limited thereto, and may also be in line contact, depending on the specific situation.
  • the orthographic projection of the anti-crack block 207 in the reference plane may include the first point and the second point that are farthest apart; in two adjacent rows of anti-crack block groups, The junction points between the first and second points of the crack-preventing blocks 207 in one row and the adjacent crack-preventing blocks 207 in the other row may be located on the same straight line P, so that the cracks pass through a row of anti-crack blocks After the crack block group, the strongest blocking area of the next row of crack prevention block groups (ie, the area with the largest size in the crack prevention block 207 ) will be encountered, which can better prevent the crack from continuing to extend in the display area.
  • the orthographic projection shape of the anti-crack stopper 207 in the reference plane is a quadrilateral; wherein, the quadrilateral has a first diagonal and a second diagonal, and the two ends of the first diagonal are the aforementioned The first point and the second point, and the length of the first diagonal is greater than the length of the second diagonal.
  • the outer contour of the orthographic projection of the portion of the display substrate 1a located in the arc-shaped corner region 20c on the reference plane is a circular arc.
  • the experimental analysis shows that due to the influence of the synthetic stress and the coating direction of the film itself, as shown in Figure 8, the crack direction S generated during bending and the normal line N of its corresponding part (the normal line N is perpendicular to the tangent line M) There is a certain angle in the direction of the crack prevention block 207, therefore, in order to make the crack prevention block 207 better to block cracks, in the design, the first diagonal line of the crack prevention block 207 can be made parallel to the crack direction S, such as As shown in FIG. 14 , that is, there is a certain included angle between the first diagonal line of the anti-cracking stopper 207 and the normal line of the tangent point corresponding to the first diagonal line in the aforementioned circular arc line.
  • this included angle is an acute angle; further, the included angle between the first diagonal and the normal of the tangent point corresponding to the first diagonal in the arc is 5° to 30°, for example: 5 °, 10°, 15°, 20°, 25°, 30°, etc.
  • the quadrilateral can be symmetrically arranged with respect to the first diagonal line, which facilitates the arrangement of the plurality of anti-crack stoppers 207 according to the outline of the outer arc, but is not limited to this. shape to adjust.
  • the orthographic projection shape of the anti-crack block 207 in the anti-crack block group closest to the outer arc edge 204 in the reference plane is a rhombus, so as to better guide, evacuate and release stress energy, thereby It can relieve cracks from extending to the display area and other film layers.
  • the crack prevention blocks 207 in other crack prevention block groups can also be diamond-shaped, but not limited to this, and the shape of the crack prevention blocks 207 can also be adjusted according to actual needs.
  • multiple rows of anti-crack block groups may be located in the first corner area A; and a part of the multiple rows of anti-crack block groups that are far from the display area 10 It can be extended to the second corner area B, that is, the number of rows of the anti-crack block group at the second corner area B is smaller than the number of rows of the anti-crack block group at the first corner area A, and the second corner area
  • the anti-crack block group at B is arranged close to the outer arc edge 204 ; because the stress on the first corner region A when the first side region 20a of the flexible display device 1 is bent away from the display side of the flexible display device 1 The stress is greater than the stress on the second corner area B.
  • the anti-crack block group can effectively prevent cracks from extending to the display area, and at the same time save more space for arranging other wirings.
  • the anti-crack block group located in the first corner area A there are three rows of anti-crack block groups located in the first corner area A; wherein, two rows of anti-crack block groups located near the outer arc edge 204 in the three rows of anti-crack block groups extend to the second corner area B , that is to say, the anti-crack block group located in the first corner area A may be provided with three rows, the anti-crack block group located in the second corner area B may be provided with two rows, and the two blocks located in the second corner area B
  • the rows of anti-crack block groups are arranged in a one-to-one correspondence with the two outermost rows of anti-crack block groups located in the first corner area A.
  • the number of rows of crack prevention block groups in the first corner area A and the second corner area B is not limited to those mentioned above, and may be more, depending on the specific situation.
  • the anti-crack retaining walls 206 may be provided with multiple circles, and there is a gap between two adjacent circles of anti-crack retaining walls 206 ; wherein, the multiple circles of anti-crack retaining walls 206 are located at the first corner area A, and the part of the anti-crack retaining walls 206 far from the display area 10 in the multi-circle anti-crack retaining walls 206 extends to the second corner area B, the first side area 20a and the second side area 20b.
  • the stress on the first corner region A is greater than the stress on the second corner region B.
  • Designing more circles of anti-crack retaining walls 206 can effectively prevent cracks from extending to the display area; and designing fewer circles of anti-crack retaining walls 206 at the second corner area B can effectively prevent cracks from extending to the display area, while also preventing cracks from extending to the display area. More space can be saved for other traces.
  • the crack prevention walls 206 in the second corner area B, the first side area 20a and the second side area 20b may be provided with two circles, and the crack prevention walls in the first corner area A
  • the wall 206 can be arranged in six circles; wherein, the anti-crack retaining walls 206 in the second corner area B, the first side area 20a and the second side area 20b are close to the outer arc edge 204, and are connected with the first corner area A.
  • the corresponding anti-cracking retaining wall 206 is integrally formed into a ring structure to better protect the display area 10 .
  • the experimental analysis shows that when the first side region 20a of the flexible display device 1 is bent in a direction away from the display side of the flexible display device 1, the first sub-region A1, the second sub-region A2, and the fourth sub-region A4
  • the stress is relatively large, therefore, as shown in FIG. 7 , three rows of anti-cracking block groups can be designed in the first sub-area A1, the second sub-area A2, and the fourth sub-area A4, and six circles of anti-cracking blocking walls 206 can be arranged.
  • the stress that the third sub-area A3 is subjected to is relatively small, therefore, as shown in the figure, the third sub-area A3 can be provided with two rows of anti-crack block groups, and two rings of anti-crack blocking walls 206 can be provided.
  • the portion of the display substrate 1a located in the peripheral region 20 not only includes the anti-cracking base 205, the anti-cracking block 207 and the anti-cracking blocking wall 206, but also includes signal traces (not shown in the figure) and other circuit structures.
  • the crack-proof substrate 205, the crack-proof stopper 207 and the crack-proof stopper wall 206 can be made of good It is made of flexible organic materials.
  • the anti-cracking substrate 205 , the anti-cracking blocking block 207 and the anti-cracking blocking wall 206 are all composed of at least one organic film layer.
  • the organic film layers in the anti-cracking substrate 205 , the anti-cracking blocking block 207 and the anti-cracking blocking wall 206 can be arranged in the same layer as the film layers made of organic materials in the display area.
  • the display substrate 1a may include a flexible substrate 101, and the flexible substrate 101 includes a first organic substrate layer 101a, an inorganic barrier layer 101b, and a second organic substrate layer stacked in sequence 101c and the inorganic buffer layer 101d.
  • the materials of the first organic base layer 101a and the second organic base layer 101c may include one of PI (polyimide), PET (polyethylene terephthalate) and PC (polycarbonate) or more; the materials of the inorganic barrier layer 101b and the inorganic buffer layer 101d may include any one or more of silicon oxide (SiOx), silicon nitride (SiNx) and silicon oxynitride (SiON).
  • the anti-cracking base 205 is integrally formed with at least one of the first organic base layer 101a and the second organic base layer 101c.
  • the anti-cracking substrate 205 includes a first layer 205a integrally formed with the first organic base layer 101a and a second layer 205b integrally formed with the second organic base layer 101c.
  • the flexible substrate 101 is not limited to include the above-mentioned film layers, and may also include only one organic substrate layer, or be provided with more organic substrate layers and inorganic insulating layers.
  • the flexible substrate 101 can also extend to a part of the peripheral area 20, but is not limited thereto, depending on the specific situation.
  • the display substrate 1 a may further include a driving circuit layer and a light emitting structure layer located in the display area 10 .
  • the driving circuit layer is disposed on the inorganic buffer layer 101d, and the light emitting structure layer is disposed on the side of the driving circuit layer away from the inorganic buffer layer 101d.
  • the driving circuit layer may include thin film transistors 102 and capacitors 103 .
  • the thin film transistor 102 may include an active layer 102a, a gate electrode 102b, a source electrode 102c and a drain electrode 102d;
  • the capacitor 103 may include a first electrode plate 103a and a second electrode plate 103b located on the side of the first electrode plate 103a away from the flexible substrate 101 ;
  • the first plate 103a and the gate electrode 102b can be arranged in the same layer.
  • the material of the active layer 102a may be amorphous indium gallium zinc oxide (a-IGZO), zinc oxynitride (ZnON), indium zinc tin oxide (IZTO), amorphous silicon (a-Si), Various materials such as polysilicon (p-Si), hexathiophene, polythiophene, etc.; the gate electrode 102b, the source electrode 102c, the drain electrode 102d, the first electrode plate 103a and the second electrode plate 103b can be made of metal materials, such as silver ( Any one or more of Ag), copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or alloy materials of the above metals; such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb), which can be a single-layer structure, or a multi-layer composite structure, such as Mo/Cu/Mo, Ti/Al/Ti, etc
  • the driving circuit layer may further include a gate insulating layer 104, a capacitor insulating layer 105, an interlayer dielectric layer 106, and a passivation layer 107;
  • the gate insulating layer 104 is located between the active layer 102a and the gate electrode 102b,
  • the capacitor insulating layer 105 is located between the gate electrode 102 b and the second electrode plate 103 b , and the interlayer dielectric layer 106 is located on the side of the second electrode plate 103 b away from the flexible substrate 101 .
  • the gate insulating layer 104 , the capacitor insulating layer 105 and the interlayer dielectric layer 106 are provided with through holes penetrating the gate insulating layer 104 , the capacitor insulating layer 105 and the interlayer dielectric layer 106 , and the source electrode 102c and the drain electrode 102d respectively pass through
  • the through hole is electrically connected to the active layer 102a, and the passivation layer 107 covers the source electrode 102c and the drain electrode 102d.
  • the gate insulating layer 104 , the capacitor insulating layer 105 , the interlayer dielectric layer 106 , and the passivation layer 107 are not only located in the display area 10 , but may also be located in part of the peripheral area 20 .
  • the light emitting structure layer may include a first planarization layer 108, a via electrode 109, a second planarization layer 110, an anode 111, a pixel definition layer 112, an organic light emitting layer 113 and a cathode 114; the first planarization The layer 108 is formed on the side of the passivation layer 107 away from the flexible substrate 101, that is, the first planarization layer 108 can cover the thin film transistor 102 and the capacitor 103; A via hole on the planarization layer 108 and the passivation layer 107 is electrically connected to the thin film transistor 102, specifically the drain electrode 102d of the thin film transistor 102; the second planarization layer 110 covers the transfer electrode 109; the anode 111 is formed on the first The second planarization layer 110 faces away from the flexible substrate 101 and is electrically connected to the via electrodes 109 through the via holes on the second planarization layer 110 ; the pixel definition layer 112 is formed on the second planarization layer 110
  • the materials of the first planarization layer 108 , the second planarization layer 110 and the pixel definition layer 112 are organic materials, which include PI, acrylic or polyethylene terephthalate, etc.;
  • the material is a metal material, such as any one or more of Ag, Cu, Al, Ti and Mo, or an alloy material of the above metals;
  • the material of the anode 111 can be indium tin oxide ITO or indium zinc oxide IZO, etc.; organic
  • organic The light-emitting layer 113 includes a stacked hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer;
  • the material of the cathode 114 may include magnesium (Mg), silver (Ag), aluminum (Al), copper Any one or more of (Cu) and lithium (Li), or an alloy made with any one or more of the above metals.
  • the display substrate 1a of the embodiment of the present disclosure may not be provided with the via electrodes 109 and the second planarization layer 110 , that is, the anode 111 may be formed on the first planarization layer 108 and pass through the first planarization layer 108 .
  • the via holes on the passivation layer and the passivation layer 107 are connected to the drain electrode 102 d of the thin film transistor 102 .
  • the display substrate 1 a further includes a first encapsulation barrier wall 208 and a second encapsulation barrier wall 209 located in the peripheral area 20 and surrounding the display area 10 , and the first encapsulation barrier wall 208 is located on the anti-cracking barrier wall 206
  • the second encapsulation barrier wall 209 is located on the side of the first encapsulation barrier wall 208 close to the display area 10, and the height of the first encapsulation barrier wall 208 is greater than the height of the second encapsulation barrier wall 209;
  • An encapsulation retaining wall 208 may be disposed in the same layer as at least one of the second planarization layer 110 and the pixel definition layer 112 and be disconnected from each other.
  • the first encapsulation retaining wall 208 includes the same layer as the second planarization layer 110
  • the third layer 208a that is disconnected from each other and the fourth layer 208b that are provided in the same layer as the pixel definition layer 112 and are disconnected from each other, but not limited to this;
  • At least one of the layers 112 is disposed on the same layer and disconnected from each other, for example, the second encapsulation retaining wall 209 and the pixel definition layer 112 are disposed on the same layer and disconnected from each other.
  • the display substrate 1 a may include an encapsulation layer 115 , and the encapsulation layer 115 may be formed in the display area 10 and part of the peripheral area 20 , and the encapsulation layer 115 includes a first inorganic encapsulation layer 115 a , an organic encapsulation layer 115 , and an organic encapsulation layer 115 , which are stacked in sequence. layer 115b, second inorganic encapsulation layer 115c.
  • the first inorganic encapsulation layer 115a and the second inorganic encapsulation layer 115c are disposed on the display area 10 and part of the peripheral area 20, wrapping the first encapsulation barrier wall 208 and the second encapsulation barrier wall 209, and the organic encapsulation layer 115b is disposed on the first inorganic encapsulation layer 115a and the second inorganic encapsulation layer 115c are located on the side of the second encapsulation barrier wall 209 close to the display area 10.
  • the first inorganic encapsulation layer 115a and the second inorganic encapsulation layer 115c can be fabricated by chemical vapor deposition process, but not limited thereto, physical vapor deposition process can also be used; and the organic encapsulation layer 115b can be formed by inkjet It is produced by printing process, but not limited to this, and spraying process can also be used.
  • the organic encapsulation layer 115b since the organic encapsulation material has a certain fluidity, the first encapsulation retaining wall 208 and the second encapsulation retaining wall 209 can restrict the flow of the organic encapsulation material, so as to avoid causing encapsulation. failure problem.
  • first inorganic encapsulation layer 115a and the second inorganic encapsulation layer 115c may also cover the anti-crack blocking block 207 and the anti-cracking blocking wall 206, but are not limited thereto, depending on the specific situation.
  • some circuit structures may also be provided in the portion of the peripheral area 20 close to the display area 10 , such as: peripheral wiring 210 , a first peripheral patch cord 211 and a second peripheral patch cord 212 .
  • the peripheral wiring 210 can be arranged on the same layer as the source electrode 102c and the drain electrode 102d
  • the first peripheral wiring 211 can be arranged on the same layer as the anode 111
  • the second peripheral wiring 212 can be arranged on the same layer as the switching electrode 109 of the display area 10a set up.
  • the peripheral traces 210 may be located below the first encapsulation barrier wall 208 and the second encapsulation barrier wall 209 , and the first peripheral wiring 211 may be located between the third layer 208 a and the fourth layer 208 b in the second encapsulation barrier wall 209 ;
  • the second peripheral transfer line 212 may be located below the first encapsulation retaining wall 208 and the second encapsulating retaining wall 209 .
  • a first pattern block 213 may be disposed below the second encapsulation barrier 209 to elevate the second encapsulation barrier 209 ; the first pattern block 213 may be in the same layer as the second planarization layer 110 set up.
  • a second pattern block 214 may be disposed below the first encapsulation barrier wall 208 to elevate the first encapsulation barrier wall 208 ; the second pattern block 214 may be disposed on the same layer as the first planarization layer 108 .
  • circuit structure in the peripheral region 20 is not limited to this, and depends on the specific situation.
  • the flexible display device 1 further includes a touch substrate 1e located at least in the display area 10 , the touch substrate 1e is located on the side of the polarizer 1b close to the display substrate 1a, and is located on the packaging layer 115 away from the flexible substrate 101 side.
  • the touch substrate 1e may include a touch electrode layer 116 on the light emitting structure layer away from the driving circuit layer and an organic protective layer 117 on the side of the touch electrode layer 116 away from the display substrate 1a, wherein the touch electrode layer 116
  • the receiving electrode and the transmitting electrode which are insulated from each other may be included; the material of the organic protective layer 117 may include PI, acrylic or polyethylene terephthalate and the like.
  • part of the touch substrate 1e may also be located in part of the peripheral area 20, depending on the specific situation.
  • the position of the touch substrate 1e is not limited to this, and may also be disposed on the side of the polarizer 1b away from the flexible substrate 101, depending on the specific situation.
  • the anti-crack retaining wall 206 may be disposed in the same layer and disconnected from at least one of the first planarization layer 108 , the second planarization layer 110 , the pixel definition layer 112 and the organic protective layer 117 10, the anti-crack retaining wall 206 may include a fifth layer 206a arranged in the same layer as the first planarization layer 108 and disconnected from each other, and a fifth layer 206a arranged in the same layer as the second planarization layer 110 and disconnected from each other.
  • the sixth layer 206b and the seventh layer 206c which are provided on the same layer as the organic protective layer 117 and are disconnected from each other, but it should be understood that the structure of the anti-cracking retaining wall 206 is not limited to this, depending on the specific situation.
  • the anti-crack stopper 207 may be disposed in the same layer and disconnected from at least one of the first planarization layer 108 , the second planarization layer 110 , the pixel definition layer 112 and the organic protective layer 117 , as shown in FIG. 10 .
  • the anti-crack retaining wall 206 may include an eighth layer 207a provided in the same layer as the first planarization layer 108 and disconnected from each other, a ninth layer 207b provided in the same layer as the second planarization layer 110 and disconnected from each other, and
  • the organic protective layer 117 is the tenth layer 207c provided in the same layer and disconnected from each other, but it should be understood that the structure of the anti-crack stopper 207 is not limited to this, depending on the specific situation.
  • the number of organic film layers in the anti-crack retaining wall 206 and the anti-crack blocking block 207 are the same and correspond one-to-one, wherein the anti-crack retaining wall 206 and the anti-crack blocking block 207 have the same number of layers of film layers. set and disconnect from each other. Since the film layer of the anti-cracking block 207 is the same as the film layer of the anti-cracking blocking wall 206, therefore, when designing the mask, a film stacking design consistent with the anti-cracking blocking wall 206 can be adopted, and the coating process is performed synchronously. No new processes are added, the product production Tact Time is maintained, and the mold and production costs are not increased.
  • the surface of the anti-cracking stop 207 remote from the anti-cracking base 205 may be flush with the surface of the anti-cracking retaining wall 206 that is remote from the anti-cracking base 205 .
  • the thickness h of the anti-crack retaining wall 206 can be about 4 ⁇ m to 5 ⁇ m, such as 4 ⁇ m, 4.5 ⁇ m, 5 ⁇ m, etc., which can increase the blocking effect on cracks and reflect the advantages of the anti-cracking retaining wall 206 .
  • the display area of the embodiment of the present disclosure can also be designed with an opening, and the opening (not shown in the figure) can be used for assembling functional devices such as a camera, a sensor, a HOME key, an earpiece or a speaker.
  • An embodiment of the present disclosure also provides an electronic device, which includes the flexible display device 1 described in any of the foregoing embodiments.
  • the specific type of the electronic device is not particularly limited, and any type of electronic device commonly used in the art can be used, such as OLED displays, mobile phones, tablet computers, notebook computers and other mobile devices, watches, wristbands, etc.
  • the wearable device can be selected by those skilled in the art according to the specific application, which will not be repeated here.
  • the electronic device also includes other necessary components and components. Taking a display as an example, such as a casing, a power cord, a driver chip, etc., those skilled in the art can use the display device as an example. The specific use requirements of the system should be supplemented accordingly, and will not be repeated here.

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Abstract

一种柔性显示装置（1）及电子设备，具有良好品质和信赖性。柔性显示装置（1）包括依次层叠的显示基板（1a）、偏光片（1b）及第一光学胶层（1c）；柔性显示装置（1）具有显示区（10）和环绕显示区（10）设置的外围区（20），外围区（20）包括具有第一拐角区（A）和第二拐角区（B）的弧形拐角区（20c）；弧形拐角（20c）的中心位置位于第一拐角区（A）；弧形拐角区（20c）能够弯曲，且第一拐角区（A）的弯曲角度大于第二拐角区（B）的弯曲角度；在第一拐角区（A）中，偏光片（1b）和/或第一光学胶层（1c）的外轮廓超出显示基板（1a）的外轮廓；显示基板（1a）包括至少位于第一拐角区（A）的防裂纹基底（205）、防裂纹挡墙（206）及多个防裂纹挡块（207）；防裂纹挡墙（206）形成在防裂纹基底（205）上并位于显示区（10）的外侧；多个防裂纹挡块（207）形成在防裂纹基底（205）上并位于防裂纹挡墙（206）远离显示区（10）一侧。

Description

柔性显示装置及电子设备
交叉引用
本公开要求于2020年7月17日提交的申请号为202010690264.X名称为“柔性显示装置及电子设备”的中国专利申请的优先权，该中国专利申请的全部内容通过引用全部并入本文。
技术领域
本公开涉及显示技术领域，具体而言，涉及一种柔性显示装置及电子设备。
背景技术
目前，从市场趋势来看，柔性显示产品成为手机、平板电脑等电子设备青睐的对象，柔性显示产品可根据电子设备匹配不同的外形模型设计，提供不同的曲面显示需求。
但柔性显示产品在弯曲后，一定存在应力问题；尤其是在拐角位置处，应力问题较严重，容易产生裂纹等不良现象，从而容易导致产品封装失效，显示区中容易出现黑色斑点等不良，影响产品品质，产品信赖性较低；同时产品在使用过程中拐角位置处最容易受到外力按压，产生不良的风险很大。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本公开的目的在于提供一种柔性显示装置及电子设备，具有良好品质和信赖性。
本公开第一方面提供了一种柔性显示装置，所述柔性显示装置包括依次层叠的显示基板、偏光片及第一光学胶层；所述柔性显示装置具有显示区和环绕所述显示区设置的外围区，所述外围区包括在第一方向上延伸的第一侧边区、在第二方向上延伸的第二侧边区、以及位于所述第一侧边区和所述第二侧边区之间的弧形拐角区；
其中，所述弧形拐角区具有依次首尾相连的第一边、内弧边、第二边及外弧边，所述第一边与所述第一侧边区相接，所述第二边与所述第二侧边区相接；所述弧形拐角区包括具有所述第一边的第一拐角区和具有所述第二边的第二拐角区，且所述弧形拐角区的中心位置位于所述第一拐角区；所述弧形拐角区能够弯曲，且所述第一拐角区的弯曲角度大于所述第二拐角区的弯曲角度；在所述第一拐角区中，所述偏光片和/或所述第一光学胶层在参考平面上的正投影的外轮廓位于所述显示基板在所述参考平面上的正投影的外轮廓的外侧；
其中，所述显示基板包括至少位于所述第一拐角区的防裂纹基底、防裂纹挡墙及多个防裂纹挡块；所述防裂纹挡墙形成在所述防裂纹基底上并位于所述显示区的外侧；所 述多个防裂纹挡块形成在所述防裂纹基底上并位于所述防裂纹挡墙远离所述显示区一侧；
所述第一方向与所述第二方向相交；所述参考平面为与所述第一方向和所述第二方向相平行的平面。
在本公开的一种示例性实施例中，所述防裂纹基底、所述防裂纹挡墙及所述防裂纹挡块还位于所述第二拐角区；
所述多个防裂纹挡块划分成至少两排防裂纹挡块组，每排所述防裂纹挡块组包括多个按照所述显示基板中位于所述弧形拐角区的部分在所述参考平面上的正投影的外轮廓进行排布的所述防裂纹挡块；其中，
每排所述防裂纹挡块组中相邻所述防裂纹挡块的中间区域相接触，且其两侧区域之间具有缝隙；
在相邻两排所述防裂纹挡块组中，一排中防裂纹挡块与另一排中相邻防裂纹挡块之间的缝隙相对应。
在本公开的一种示例性实施例中，所述防裂纹挡块在所述参考平面中的正投影包括距离最远的第一点和第二点；
在相邻两排所述防裂纹挡块组中，一排中防裂纹挡块的第一点和第二点与另一排中相邻防裂纹挡块之间的相接点位于同一条直线上。
在本公开的一种示例性实施例中，所述防裂纹挡块在所述参考平面中的正投影形状为四边形；所述显示基板中位于所述弧形拐角区的部分在所述参考平面上的正投影的外轮廓线为圆弧线；
所述四边形具有第一对角线和第二对角线，所述第一对角线的两端点分别为所述第一点和所述第二点，且所述第一对角线的长度大于所述第二对角线的长度；其中，所述第一对角线和所述外弧边中与所述第一对角线对应的切点的法线之间的夹角为锐角。
在本公开的一种示例性实施例中，所述第一对角线和所述弧线中与所述第一对角线对应的切点的法线之间的夹角为5°至30°。
在本公开的一种示例性实施例中，所述四边形关于所述第一对角线呈对称设置。
在本公开的一种示例性实施例中，位于最靠近所述外弧边的防裂纹挡块组中的所述防裂纹挡块在所述参考平面中的正投影形状为菱形。
在本公开的一种示例性实施例中，所述防裂纹基底、所述防裂纹挡块及所述防裂纹挡墙均由至少一层有机膜层构成。
在本公开的一种示例性实施例中，在所述显示区中，所述显示基板包括柔性基底，所述柔性基底包括依次层叠的第一有机基底层、无机阻挡层、第二有机基底层和无机缓冲层；
所述防裂纹基底与所述第一有机基底层和所述第二有机基底层中的至少一者一体形成。
在本公开的一种示例性实施例中，所述显示基板还包括位于所述显示区的驱动电路层和发光结构层，所述驱动电路层设置在所述无机缓冲层上，所述发光结构层设置在所述驱动电路层远离所述无机缓冲层的一侧；所述驱动电路层包括薄膜晶体管，所述发光结构层包括覆盖所述薄膜晶体管的第一平坦化层、形成在所述第一平坦化层上的转接电极、覆盖所述转接电极的第二平坦化层以及依次形成在所述第二平坦化层上的阳极和像素定义层，所述阳极通过过孔与所述转接电极电连接，所述转接电极通过过孔与所述薄膜晶体管电连接，所述像素定义层上开设有露出所述阳极的像素开口，所述第一平坦化层、所述第二平坦化层和所述像素定义层的材料为有机材料；
所述柔性显示装置还包括至少位于所述显示区触控基板，所述触控基板位于所述偏光片靠近所述显示基板的一侧，所述触控基板包括位于所述发光结构层远离所述驱动电路层的触控电极层和位于所述触控电极层远离所述显示基板一侧的有机保护层；
所述防裂纹挡墙与所述第一平坦化层、所述第二平坦化层、所述像素定义层和所述有机保护层中的至少一者同层设置并相互断开；
所述防裂纹挡块与所述第一平坦化层、所述第二平坦化层、所述像素定义层和所述有机保护层中的至少一者同层设置并相互断开。
在本公开的一种示例性实施例中，所述防裂纹挡墙和所述防裂纹挡块中有机膜层的层数相同，并一一对应。
在本公开的一种示例性实施例中，所述防裂纹挡块中远离所述防裂纹基底的表面与所述防裂纹挡墙中远离所述防裂纹基底的表面相平齐。
在本公开的一种示例性实施例中，所述防裂纹挡墙的厚度为4μm至5μm。
在本公开的一种示例性实施例中，所述显示基板还包括位于所述外围区并环绕所述显示区的第一封装挡墙和第二封装挡墙，所述第一封装挡墙位于所述防裂纹挡墙靠近所述显示区的一侧，所述第二封装挡墙位于所述第一封装挡墙靠近所述显示区的一侧，所述第一封装挡墙的高度大于所述第二封装挡墙的高度；
所述第一封装挡墙与所述第二平坦化层、所述像素定义层中的至少一者同层设置并相互断开；
所述第二封装挡墙与所述第二平坦化层、所述像素定义层中的至少一者同层设置并相互断开。
在本公开的一种示例性实施例中，所述至少两排防裂纹挡块组位于所述第一拐角区；且所述至少两排防裂纹挡块组中远离所述显示区的部分防裂纹挡块组延伸至所述第二拐 角区。
在本公开的一种示例性实施例中，位于所述第一拐角区中所述防裂纹挡块组设置有三排；其中，三排所述防裂纹挡块组中靠近所述外弧边的两排所述防裂纹挡块组延伸至所述第二拐角区。
在本公开的一种示例性实施例中，所述防裂纹挡墙设置有多圈，相邻两圈所述防裂纹挡墙之间具有缝隙；
其中，多圈所述防裂纹挡墙位于所述第一拐角区，且多圈所述防裂纹挡墙中远离所述显示区的部分所述防裂纹挡墙延伸至所述第二拐角区、所述第一侧边区和所述第二侧边区。
在本公开的一种示例性实施例中，在所述第一拐角区，所述偏光片和所述第一光学胶层在参考平面上的正投影的外轮廓均位于所述显示基板在所述参考平面上的正投影的外轮廓的外侧，且所述偏光片在参考平面上的正投影的外轮廓与所述第一光学胶层在参考平面上的正投影的外轮廓重合。
在本公开的一种示例性实施例中，所述第一拐角区包括第一子区和位于所述第一子区靠近所述第一侧边区的第二子区，其中，所述弧形拐角区的中心位置位于所述第一子区；
在所述第一子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第一距离；
在所述第二子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第二距离；
其中，所述第二距离大于所述第一距离。
在本公开的一种示例性实施例中，所述第一拐角区还包括第三子区和第四子区；所述第三子区位于所述第一子区靠近所述第二拐角区的一侧，所述第四子区位于所述第二子区靠近所述第一侧边区的一侧，；
在所述第三子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第三距离；
在所述第四子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第四距离；
其中，所述第三距离小于所述第一距离，所述第四距离小于所述第二距离。
在本公开的一种示例性实施例中，在所述第二拐角区中，所述偏光片和所述第一光学胶层在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓的重合。
在本公开的一种示例性实施例中，还包括盖板，位于所述第一光学胶层远离所述偏光片的一侧；
其中，所述偏光片和所述第一光学胶层在参考平面上的正投影的外轮廓位于所述盖板在所述参考平面上的正投影的外轮廓内或与之重合。
本公开的第二方面还提供了一种电子设备，其包括上述任一项所述的柔性显示装置。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出了本公开实施例所述的柔性显示装置的结构示意图；
图2示出了本公开一实施例所述的柔性显示装置中弧形拐角区的结构示意图；
图3示出了本公开实施例所述的柔性显示装置的边缘处于弯曲状态的结构示意图；
图4示出了本公开实施例所述的柔性显示装置在一视角下的结构示意图；
图5示出了本公开实施例所述的柔性显示装置在弯曲时裂纹产生的原理图；
图6示出了本公开另一实施例所述的柔性显示装置中弧形拐角区的结构示意图；
图7示出了本公开又一实施例所述的柔性显示装置中弧形拐角区的结构示意图；
图8示出了本公开一实施例所述的柔性显示装置的弧形拐角区在弯曲过程中裂纹方向和与其对应部分的法线之间的关系示意图；
图9示出了图1中所示的沿D-D线的截面示意图；
图10示出了图7中所示的沿Q-Q线的截面示意图；
图11示出了图7中所示的沿R-R线的截面示意图；
图12至图14分别示出了本公开一实施例所述的防裂纹挡块阻挡裂纹延伸的示意图。
附图标记：
1、柔性显示装置；1a、显示基板；1b、偏光片；1c、第一光学胶层；1d、盖板；1e、触控基板；10、显示区；101、柔性基底；101a、第一有机基底层；101b、无机阻挡层；101c、第二有机基底层；101d、无机缓冲层；102、薄膜晶体管；102a、有源层；102b、栅电极、102c、源电极；102d、漏电极；103、电容；103a、第一极板；103b、第二极板；104、栅极绝缘层；105、电容绝缘层；106、层间介质层；107、钝化层；108、第一平坦 化层；109、转接电极；110、第二平坦化层；111、阳极；112、像素定义层；113、有机发光层；114、阴极；115、封装层；115a、第一无机封装层；115b、有机封装层；115c、第二无机封装层；116、触控电极层；117、有机保护层；20、外围区；20a、第一侧边区；20b、第二侧边区；20c、弧形拐角区；201、第一边；202、内弧边；203、第二边；204、外弧边；205、防裂纹基底；205a、第一层；205b、第二层；206、防裂纹挡墙；206a、第五层；206b、第六层；206c、第七层；207、防裂纹挡块；207a、第八层；207b、第九层；207c、第十层；208、第一封装挡墙；208a、第三层；208b、第四层；209、第二封装挡墙；210、外围走线；211、第一外围转接线；212、第二外围转接线；213、第一图案块；214、第二图案块。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚明白，下文中将结合附图对本公开的实施例进行详细说明。注意，实施方式可以以多个不同形式来实施。所属技术领域的普通技术人员可以很容易地理解一个事实，就是方式和内容可以在不脱离本公开的宗旨及其范围的条件下被变换为各种各样的形式。因此，本公开不应该被解释为仅限定在下面的实施方式所记载的内容中。在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互任意组合。
在附图中，有时为了明确起见，夸大表示了各构成要素的大小、层的厚度或区域。因此，本公开的一个方式并不一定限定于该尺寸，附图中各部件的形状和大小不反映真实比例。此外，附图示意性地示出了理想的例子，本公开的一个方式不局限于附图所示的形状或数值等。
本说明书中的“第一”、“第二”、“第三”等序数词是为了避免构成要素的混同而设置，而不是为了在数量方面上进行限定的。
在本说明书中，为了方便起见，使用“中间区域”、“两侧区域”“上”、“内”、“外”等指示方位或位置关系的词句以参照附图说明构成要素的位置关系，仅是为了便于描述本说明书和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。构成要素的位置关系根据描述各构成要素的方向适当地改变。因此，不局限于在说明书中说明的词句，根据情况可以适当地更换。
在本说明书中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解。例如，可以是固定连接，或可拆卸连接，或一体地连接；可以是机械连接，或电连接；可以是直接相连，或通过中间件间接相连，或两个元件内部的连通。对 于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
在本公开中，除非另有说明，所采用的术语“同层设置”指的是两个层、部件、构件、元件或部分可以通过同一构图工艺形成，并且，这两个层、部件、构件、元件或部分一般由相同的材料形成。
在本公开中，除非另有说明，表述“构图工艺”一般包括光刻胶的涂布、曝光、显影、刻蚀、光刻胶的剥离等步骤。表述“一次构图工艺”意指使用一块掩模板形成图案化的层、部件、构件等的工艺。
本公开一实施例提供一种柔性显示装置，如图1所示，柔性显示装置1具有显示区10和环绕显示区10设置的外围区20，此外围区20包括在第一方向Y上延伸的第一侧边区20a、在第二方向X上延伸的第二侧边区20b、以及位于第一侧边区20a和第二侧边区20b之间的弧形拐角区20c。
如图1所示，本公开实施例中的柔性显示装置1在参考平面上的正投影形状可类似为矩形，也就是说，柔性显示装置1可包括两个在第二方向X上相对的第一侧边区20a、两个在第一方向Y上相对的第二侧边区20b及四个弧形拐角区20c。
需要说明的是，本公开实施例的第一方向Y可与第二方向X相交，可选地，第一方向Y与第二方向X正交。此外，本公开实施例中提到的参考平面为与第一方向Y和第二方向X相平行的平面。
如图1所示，第一侧边区20a和第二侧边区20b可为矩形；但不限于此，也可为其他形状；且如图2所示，弧形拐角区20c具有依次首尾相连的第一边201、内弧边202、第二边203及外弧边204，第一边201与第一侧边区20a相接，第二边203与第二侧边区20b相接。
需要说明的是，由于本公开实施例的第一侧边区20a和第二侧边区20b可为矩形，因此，与第一侧边区20a相接的第一边201和与第二侧边区20b相接的第二边203可为直边，但不限于此，第一边201和第二边203可根据第一侧边区20a和第二侧边区20b的形状而定。
在本公开的实施例中，柔性显示装置1的边缘能够进行弯曲，形成如图3所示的弯曲区域C，此弯曲区域C可包括如图1所示的第一侧边区20a和弧形拐角区20c，以及还可包括显示区10中靠近第一侧边区20a和弧形拐角区20c的部分，以实现曲面显示。详细说明，柔性显示装置1的第一侧边区20a可向远离柔性显示装置1的显示侧的方向弯曲，应当理解的是，在第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，弧形拐角区20c、显示区10也随着第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲。
其中，由于本公开实施例的柔性显示装置1中拐角区呈弧形，因此，在柔性显示装置1进行弯曲时，该弧形拐角区20c受到的应力会远远大于第一侧边区20a受到的应力，这样使得弧形拐角区20c容易发生裂纹，从而影响产品性能以及影响产品信赖性。此外，该弧形拐角区20c还容易在外力按压下产生裂纹。
如图2所示，本公开实施例的弧形拐角区20c可包括具有第一边201的第一拐角区A和具有第二边203的第二拐角区B，也就是说，第一拐角区A靠近第一侧边区20a，第二拐角区B靠近第二侧边区20b；其中，如图2所示，第一拐角区A和第二拐角区B可共用一直边，且第一拐角区A可包括内弧边202的部分和外弧边204的部分，第二拐角区B可包括内弧边202的另一部分和外弧边204的另一部分。
需要说明的是，弧形拐角区20c的中心位置位于第一拐角区A。此外，应当理解的是，由于第一拐角区A相比于第二拐角区B更靠近第一侧边区20a，因此，如图3所示，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一拐角区A的弯曲角度α1大于第二拐角区B的弯曲角度α2；此弯曲角度可为第一拐角区A、第二拐角区B的弯曲末端的切线与参考平面之间的夹角，需要说明的是，图3中的虚线Q位于此参考平面内。
其中，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，经实验分析可知，第一拐角区A整体相比于第二拐角区B整体受到的应力较大，也就是说，第一拐角区A相比于第二拐角区B更容易发生裂纹。
基于上述内容，为改善弧形拐角区20c处发生裂纹的情况，本公开实施例对柔性显示装置1中位于弧形拐角区20c处的结构进行了改进，具体如下：
如图4所示，本公开实施例的柔性显示装置1可包括依次层叠的显示基板1a、偏光片1b及第一光学胶层1c，此显示基板1a、偏光片1b及第一光学胶层1c位于显示区10和外围区20。需要说明的是，此显示基板1a可为OLED(OrganicLight-Emitting Diode，有机发光二极管)显示，但不限于此。
如图4所示，柔性显示装置1还可包括盖板1d，此盖板1d位于第一光学胶层1c远离偏光片1b的一侧。具体地，盖板1d可通过第一光学胶层1c与偏光片1b进行粘接。需要说明的是，显示基板1a、偏光片1b和第一光学胶层1c在参考平面上的正投影的外轮廓需位于盖板1d在参考平面上的正投影的外轮廓内；应当理解的是，显示基板1a、偏光片1b和第一光学胶层1c在来料、切割等均存在公差，但显示基板1a、偏光片1b和第一光学胶层1c外形的轻微裱花并不影响柔性显示装置1的外形，因为柔性显示装置1的外形主要体现在盖板1d上。
此外，还需要说明的是，偏光片1b和第一光学胶层1c在参考平面上的正投影的外 轮廓也可与盖板1d在参考平面上的正投影的外轮廓重合，视具体情况而定。
由于柔性显示装置1在未弯曲之前为平板结构；因此，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，柔性显示装置1主要受张应力影响，如图5所示，显示基板1a、偏光片1b及第一光学胶层1c表面均承受张应力F；其中，本公开实施例的偏光片1b和第一光学胶层1c的材料为有机绝缘材料，由于偏光片1b、第一光学胶层1c的材料为有机绝缘材料，因此，偏光片1b、第一光学胶层1c具有良好的柔性，在弯曲过程中不容易发生断裂；而显示基板1a通常由多种材料形成，例如：无机绝缘材料、有机绝缘材料和金属材料等，由于无机绝缘材料具有硬、脆的特点，因此，在上述弯曲过程中，显示基板1a中的无机绝缘层在承受张应力后容易断裂，尤其是在弧形拐角区20c处的无机绝缘层，裂缝产生后随着应力释放，可向其他膜层和显示区延伸，形成裂纹E。
其中，前述提到在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一拐角区A受到的应力较大，因此，为了避免第一拐角区A在弯曲时出现裂纹，在设计第一拐角区A时，如图6所示，可使偏光片1b和/或第一光学胶层1c超出显示基板1a，即：在第一拐角区A中，偏光片1b和/或第一光学胶层1c在参考平面上的正投影的外轮廓位于显示基板1a在参考平面上的正投影的外轮廓的外侧；这样设计在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一拐角区A处偏光片1b和/或第一光学胶层1c首先承受产品表面张应力，从而起到保护显示基板1a的目的，以缓解位于第一拐角区A的显示基板1a在弯曲时容易出现裂纹的情况，从而缓解整个弧形拐角区20c在弯曲时容易出现裂纹的情况，提高产品良率及信赖性。
可选地，在第一拐角区A，偏光片1b和第一光学胶层1c在参考平面上的正投影的外轮廓均可位于显示基板1a在参考平面上的正投影的外轮廓的外侧；以进一步起到保护显示基板1a的目的，缓解第一拐角区A在弯曲时容易出现裂纹的情况。进一步地，偏光片1b在参考平面上的正投影的外轮廓可与第一光学胶层1c在参考平面上的正投影的外轮廓重合，以降低设计难度。
应当理解的是，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，不仅第一拐角区A整体受到的应力与第二拐角区B整体受到的应力不同，而且第一拐角区A中不同区域所受到的应力大小也不尽相同。
在本公开的一实施例中，如图6所示，第一拐角区A可包括第一子区A1和位于第一子区A1靠近第一侧边区20a的第二子区A2，其中，弧形拐角区20c的中心位置位于第一子区A1；经实验分析可知，在柔性显示装置1的第一侧边区20a向远离柔性显示装 置1的显示侧的方向弯曲时，第二子区A2受到的应力大于第一子区A1受到的应力，因此，为了实现节省偏光片1b所占空间，以为其他设计预留出更多设计空间的目的，可使偏光片1b在应力较大的位置超出显示基板1a边缘的距离较大，在应力较小的位置超出显示基板1a边缘的距离较小；即：在第一子区A1中，偏光片1b在参考平面上的正投影的外轮廓与显示基板1a在参考平面上的正投影的外轮廓之间具有第一距离；在第二子区A2中，偏光片1b在参考平面上的正投影的外轮廓与显示基板1a在参考平面上的正投影的外轮廓之间具有第二距离；其中，第二距离大于第一距离。
其中，如图6所示，第一拐角区A还可包括第三子区A3和第四子区A4；第三子区A3位于第一子区A1靠近第二拐角区B的一侧，第四子区A4位于第二子区A2靠近第一侧边区20a的一侧，经实验分析可知，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第三子区A3受到的应力小于第一子区A1受到的应力，第四子区A4受到的应力小于第二子区A2受到的应力；为了进一步实现节省偏光片1b所占空间，以为其他设计预留出更多设计空间的目的；在本公开的实施例中，在第三子区A3中，偏光片1b在参考平面上的正投影的外轮廓与显示基板1a在参考平面上的正投影的外轮廓之间具有第三距离；在第四子区A4中，偏光片1b在参考平面上的正投影的外轮廓与显示基板1a在参考平面上的正投影的外轮廓之间具有第四距离；其中，第三距离小于第一距离，第四距离小于第二距离。
基于上述可知，偏光片1b超出显示基板1a边缘的距离可根据应力变化趋势而变化，这样使得偏光片1b在第一拐角区A对显示基板1a进行保护的同时，还可实现节省偏光片1b所占空间，以为其他设计预留出更多设计空间的目的。
需要说明的是，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，在不受外界力的干扰下；第三子区A3中应力最大的位置为与第一子区A1相接的位置，第一子区A1中应力最大的位置为与第二子区A2相接的位置，且第一子区A1中应力最大的位置为位于弧形拐角区20c的显示基板1a的中心位置，第二子区A2中应力最大的位置为与第四子区A4相接的位置，第四子区A4中应力最大的位置为与第二子区A2中应力最小的位置相接的位置；而第一距离、第二距离、第三距离及第四距离则指的是各子区中应力最大的位置处偏光片1b超出显示基板1a边缘的距离。此外，从一子区应力最大的位置到相邻另一子区应力最大的位置，偏光片1b超出显示基板1a边缘的距离逐渐增大或减小，例如：从第一子区A1应力最大的位置至第二子区A2应力最大的位置，偏光片1b超出显示基板1a边缘的距离逐渐增大。
其中，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，由于第二拐角区B受到的应力较小，此处不易产生裂纹，因此，为了更进一步 地实现节省偏光片1b所占空间，以为其他设计预留出更多设计空间的目的；在第二拐角区B中，如图6所示，偏光片1b和第一光学胶层1c在参考平面上的正投影的外轮廓可与显示基板1a在参考平面上的正投影的外轮廓的重合。
但不限于此，在第二拐角区B中，偏光片1b和第一光学胶层1c在参考平面上的正投影的外轮廓也可超出显示基板1a在参考平面上的正投影的外轮廓，视具体情况而定。
需要说明的是，本公开不仅能够通过改变偏光片1b和/或第一光学胶层1c的大小，来改善在弧形拐角区容易出现裂纹的情况，还可通过改善显示基板1a在弧形拐角区的结构来改善容易出现裂纹的情况；具体如下：
在本公开一实施例中，如图7所示，显示基板1a可包括至少位于第一拐角区A的防裂纹基底205、防裂纹挡墙206及多个防裂纹挡块207；防裂纹挡墙206形成在防裂纹基底205上并位于显示区10的外侧；多个防裂纹挡块207形成在防裂纹基底205上并位于防裂纹挡墙206远离显示区10一侧。需要说明的是，如图7所示，防裂纹基底205、防裂纹挡墙206及防裂纹挡块207还可位于第二拐角区B。
本公开实施例中通过设置防裂纹挡块207和防裂纹挡墙206可对裂纹进行阻挡，以避免其向显示区延伸，从而避免显示区出现黑色斑点等问题，提高产品信赖性和良率。此外，多个防裂纹挡块207按照一定要求排列不仅可以实现对裂纹进行阻挡的目的，还可对裂纹进行疏导，以进一步缓解裂纹向其他膜层或显示区延伸。
详细说明，如图7所示，本公开实施例的多个防裂纹挡块207可划分成至少两排防裂纹挡块组，每排防裂纹挡块组包括多个按照显示基板1a中位于弧形拐角区20c的部分在参考平面上的正投影的外轮廓进行排布的防裂纹挡块207；其中，每排防裂纹挡块组中相邻防裂纹挡块207的中间区域相接触，且其两侧区域之间具有缝隙；也就是说，每排防裂纹挡块组中相邻防裂纹挡块207之间为薄弱区，根据裂纹容易在薄弱区开裂的特点，裂纹在防裂纹挡块207边缘存在一定比例的变向，变向后裂纹可沿着防裂纹挡块207的侧壁穿过薄弱区，由于这样设计可改变裂纹的延伸方向，因此，可增加裂纹的延伸路径，起到疏导、疏散、释放应力能量的作用，从而可缓解裂纹向显示区和其他膜层延伸。
其中，如图7所示，在相邻两排防裂纹挡块组中，一排中防裂纹挡块207与另一排中相邻防裂纹挡块207之间的缝隙相对应，这样设计使得裂纹E在穿过一排防裂纹挡块组的薄弱区后，正好遇到下一排防裂纹挡块组的防裂纹挡块207，这样可完全阻挡裂纹E向显示区继续延伸，如图12所示。
此外，如图13所示，部分裂纹应力释放能量较大，可在防裂纹挡块207的侧壁分叉，能量分散，一部分沿原方向穿过一排防裂纹挡块组，分叉后裂纹能量较小，即使穿过一排防裂纹挡块组，则正好遇到下一排防裂纹挡块组的非薄弱区，下一排中的防裂纹挡块 207可完全阻挡裂纹。
需要说明的是，如裂纹为受外力按压导致，穿透能力较强，则可将防裂纹挡块组设置三排或超过三排，这样可进一步对裂纹进行疏散，以完全阻挡裂纹继续延伸。此外，还需说明的是，每排防裂纹挡块组中相邻防裂纹挡块207的中间区域可为点接触，但不限于此，也可为线接触，视具体情况而定。
在一些实施例中，如图7所示，防裂纹挡块207在参考平面中的正投影可包括距离最远的第一点和第二点；在相邻两排防裂纹挡块组中，一排中防裂纹挡块207的第一点和第二点与另一排中相邻防裂纹挡块207之间的相接点可位于同一条直线P上，这样使得裂纹在穿过一排防裂纹挡块组之后，会正好遇到下一排防裂纹挡块组的最强阻挡区(即：防裂纹挡块207中尺寸最大的区域)，可更好地阻挡裂纹继续显示区内延伸。
可选地，防裂纹挡块207在参考平面中的正投影形状为四边形；其中，四边形具有第一对角线和第二对角线，第一对角线的两端点分别为前述提到的第一点和第二点，且第一对角线的长度大于第二对角线的长度。此外，显示基板1a中位于弧形拐角区20c的部分在参考平面上的正投影的外轮廓线为圆弧线。
经实验分析可知，由于受到合成应力以及膜层本身镀膜方向的影响，如图8所示，在弯曲时产生的裂纹方向S和与其对应部分的法线N(法线N为与切线M相垂直的线)方向存在一定的夹角，因此，为了使得防裂纹挡块207能够更好地阻挡裂纹，在设计时，可使防裂纹挡块207的第一对角线与裂纹方向S平行，如图14所示，即：使防裂纹挡块207的第一对角线和前述提到的圆弧线中与第一对角线对应的切点的法线之间具有一定的夹角，应当理解的是，此夹角为锐角；进一步地，第一对角线和弧线中与第一对角线对应的切点的法线之间的夹角为5°至30°，比如：5°、10°、15°、20°、25°、30°等等。
举例而言，此四边形可关于第一对角线呈对称设置，这样便于将多个防裂纹挡块207按照外弧边的轮廓进行排布，但不限于此，也可根据实际情况对四边形的形状进行调整。
其中，位于最靠近外弧边204的防裂纹挡块组中的防裂纹挡块207在参考平面中的正投影形状为菱形，以更好地起到疏导、疏散、释放应力能量的作用，从而可缓解裂纹向显示区和其他膜层延伸。需要说明的是，其他防裂纹挡块组中的防裂纹挡块207也可为菱形，但不限于此，也可根据实际需求对防裂纹挡块207的形状进行调整。
在本公开的一些实施例中，如图7所示，多排防裂纹挡块组可位于第一拐角区A；且多排防裂纹挡块组中远离显示区10的部分防裂纹挡块组可延伸至第二拐角区B，也就是说，第二拐角区B处的防裂纹挡块组的排数小于第一拐角区A处的防裂纹挡块组的排数，且第二拐角区B处的防裂纹挡块组靠近外弧边204设置；由于在柔性显示装置1的 第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一拐角区A受到的应力大于第二拐角区B受到的应力，因此，通过在第一拐角区A处设计较多排防裂纹挡块组可有效防止裂纹向显示区内延伸；而将第二拐角区B处设计较少排防裂纹挡块组，在有效防止裂纹向显示区内延伸的同时，还可节省出更多的空间布置其他走线。
举例而言，位于第一拐角区A中防裂纹挡块组设置有三排；其中，三排防裂纹挡块组中靠近外弧边204的两排防裂纹挡块组延伸至第二拐角区B，也就是说，位于第一拐角区A中防裂纹挡块组可设置有三排，位于第二拐角区B中防裂纹挡块组可设置有两排，且位于第二拐角区B中的两排防裂纹挡块组与位于第一拐角区A中最外两排防裂纹挡块组一一对应排布。
需要说明的是，第一拐角区A和第二拐角区B中防裂纹挡块组的排数不限于上述提到，也可更多，视具体情况而定。
在一些实施例中，如图7所示，防裂纹挡墙206可设置有多圈，相邻两圈防裂纹挡墙206之间具有缝隙；其中，多圈防裂纹挡墙206位于第一拐角区A，且多圈防裂纹挡墙206中远离显示区10的部分防裂纹挡墙206延伸至第二拐角区B、第一侧边区20a和第二侧边区20b，由于在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一拐角区A受到的应力大于第二拐角区B受到的应力，因此，通过在第一拐角区A处设计较多圈防裂纹挡墙206可有效防止裂纹向显示区内延伸；而将第二拐角区B处设计较少圈防裂纹挡墙206，在有效防止裂纹向显示区内延伸的同时，还可节省出更多的空间布置其他走线。
举例而言，如图7所示，第二拐角区B、第一侧边区20a和第二侧边区20b中防裂纹挡墙206可设置有两圈，第一拐角区A中防裂纹挡墙206可设置六圈；其中，第二拐角区B、第一侧边区20a和第二侧边区20b中的防裂纹挡墙206靠近外弧边204，并与第一拐角区A中与之对应的防裂纹挡墙206一体形成为环状结构，以对显示区10进行更好的保护。
其中，经实验分析可知，在柔性显示装置1的第一侧边区20a向远离柔性显示装置1的显示侧的方向弯曲时，第一子区A1、第二子区A2、第四子区A4受到的应力较大，因此，如图7所示，第一子区A1、第二子区A2、第四子区A4可设计三排防裂纹挡块组，以及设置六圈防裂纹挡墙206；而第三子区A3受到的应力较小，因此，如图所示，第三子区A3可设置两排防裂纹挡块组，以及设置两圈防裂纹挡墙206。
此外，还应当理解的是，显示基板1a中位于外围区20的部分不仅包括防裂纹基底205、防裂纹挡块207和防裂纹挡墙206，还可包括信号走线(图中未示出)等电路结构。
由于无机绝缘层在弯曲时容易产生裂纹，因此，在本公开的一些实施例中，为了防 止裂纹的产生，可使防裂纹基底205、防裂纹挡块207及防裂纹挡墙206均由具有良好柔性的有机材料制作而成，具体地，防裂纹基底205、防裂纹挡块207及防裂纹挡墙206均由至少一层有机膜层构成。其中，为了降低工艺成本，防裂纹基底205、防裂纹挡块207及防裂纹挡墙206中的有机膜层可与显示区中采用有机材料制作的膜层同层设置。
举例而言，如图9所示，在显示区10中，显示基板1a可包括柔性基底101，此柔性基底101包括依次层叠的第一有机基底层101a、无机阻挡层101b、第二有机基底层101c和无机缓冲层101d。其中，第一有机基底层101a、第二有机基底层101c的材料可以包括PI(聚酰亚胺)、PET(聚对苯二甲酸乙二醇酯)及PC(聚碳酸酯)中的一种或多种；无机阻挡层101b、无机缓冲层101d的材料可以包括硅氧化物(SiOx)、硅氮化物(SiNx)和氮氧化硅(SiON)中的任意一种或多种。
其中，防裂纹基底205与第一有机基底层101a和第二有机基底层101c中的至少一者一体形成。可选地，如图10所示，防裂纹基底205包括与第一有机基底层101a一体形成的第一层205a和与第二有机基底层101c一体形成的第二层205b。
需要说明的是，在显示区10中，柔性基底101不限于包括上述膜层，也可仅包括一层有机基底层，或设置有更多有机基底层和无机绝缘层。此外，该柔性基底101也可延伸至部分外围区20，但不限于此，视具体情况而定。
在本公开的一实施例中，显示基板1a还可包括位于显示区10的驱动电路层和发光结构层。此驱动电路层设置在无机缓冲层101d上，发光结构层设置在驱动电路层远离无机缓冲层101d的一侧。
详细说明，如图9所示，驱动电路层可包括薄膜晶体管102以及电容103。薄膜晶体管102可包括有源层102a、栅电极102b、源电极102c和漏电极102d；电容103可包括第一极板103a及位于第一极板103a背离柔性基底101一侧的第二极板103b；第一极板103a可与栅电极102b同层设置。举例而言，有源层102a的材料可以为非晶态氧化铟镓锌材料(a-IGZO)、氮氧化锌(ZnON)、氧化铟锌锡(IZTO)、非晶硅(a-Si)、多晶硅(p-Si)、六噻吩、聚噻吩等各种材料；栅电极102b、源电极102c、漏电极102d、第一极板103a和第二极板103b的材料可为金属材料，如银(Ag)、铜(Cu)、铝(Al)、钛(Ti)和钼(Mo)中的任意一种或更多种，或上述金属的合金材料；如铝钕合金(AlNd)或钼铌合金(MoNb)，可以是单层结构，或者多层复合结构，如Mo/Cu/Mo、Ti/Al/Ti等。
需要说明的是，驱动电路层还可包括栅极绝缘层104、电容绝缘层105、层间介质层106、钝化层107；栅极绝缘层104位于有源层102a与栅电极102b之间，电容绝缘层105位于栅电极102b与第二极板103b之间，层间介质层106位于第二极板103b背离柔性基 底101的一侧。栅极绝缘层104、电容绝缘层105及层间介质层106上设有穿透栅极绝缘层104、电容绝缘层105及层间介质层106的通孔，源电极102c及漏电极102d分别通过通孔与有源层102a电连接，钝化层107覆盖源电极102c和漏电极102d。
应当理解的是，栅极绝缘层104、电容绝缘层105、层间介质层106、钝化层107不仅位于显示区10，也可位于部分外围区20。
如图9所示，发光结构层可包括第一平坦化层108、转接电极109、第二平坦化层110、阳极111、像素定义层112、有机发光层113及阴极114；第一平坦化层108形成在钝化层107背离柔性基底101的一侧，即：第一平坦化层108可覆盖薄膜晶体管102及电容103；转接电极109形成在第一平坦化层108上，并通过第一平坦化层108和钝化层107上的过孔与薄膜晶体管102电连接，具体与薄膜晶体管102的漏电极102d电连接；第二平坦化层110覆盖转接电极109；阳极111形成在第二平坦化层110背离柔性基底101的一侧，并通过第二平坦化层110上的过孔与转接电极109电连接；像素定义层112形成在第二平坦化层110上，且像素定义层112上开设有露出阳极111的像素开口；有机发光层113至少部分位于像素开口内并与阳极111接触；阴极114整面设置，并覆盖像素定义层112和有机发光层113。
举例而言，第一平坦化层108、第二平坦化层110和像素定义层112的材料为有机材料，其包括PI、亚克力或聚对苯二甲酸乙二醇酯等；转接电极109的材料为金属材料，如Ag、Cu、Al、Ti和Mo中的任意一种或更多种，或上述金属的合金材料；阳极111的材料可为氧化铟锡ITO或氧化铟锌IZO等；有机发光层113包括叠设的空穴注入层、空穴传输层、发光层、电子传输层和电子注入层；阴极114的材料可包括镁(Mg)、银(Ag)、铝(Al)、铜(Cu)和锂(Li)中的任意一种或更多种，或采用上述金属中任意一种或多种制成的合金。
需要说明的是，本公开实施例的显示基板1a也可不设置转接电极109和第二平坦化层110，也就是说，阳极111可形成在第一平坦化层108上，并通过第一平坦化化层和钝化层107上的过孔与薄膜晶体管102的漏电极102d连接。
如图7和图11所示，显示基板1a还包括位于外围区20并环绕显示区10的第一封装挡墙208和第二封装挡墙209，第一封装挡墙208位于防裂纹挡墙206靠近显示区10的一侧，第二封装挡墙209位于第一封装挡墙208靠近显示区10的一侧，第一封装挡墙208的高度大于第二封装挡墙209的高度；其中，第一封装挡墙208可与第二平坦化层110、像素定义层112中的至少一者同层设置并相互断开，比如：第一封装挡墙208包括与第二平坦化层110同层设置且相互断开的第三层208a和与像素定义层112同层设置且相互断开的第四层208b，但不限于此；第二封装挡墙209与第二平坦化层110、像素定 义层112中的至少一者同层设置并相互断开，比如：第二封装挡墙209与像素定义层112同层设置且相互断开。
如图9和图11所示，显示基板1a可包括封装层115，此封装层115可形成在显示区10和部分外围区20，封装层115包括依次层叠的第一无机封装层115a、有机封装层115b、第二无机封装层115c。第一无机封装层115a、第二无机封装层115c设置在显示区10和部分外围区20，包裹第一封装挡墙208和第二封装挡墙209，有机封装层115b设置在第一无机封装层115a和第二无机封装层115c之间，位于第二封装挡墙209靠近显示区10的一侧。
其中，此第一无机封装层115a和第二无机封装层115c可采用化学气相沉积工艺制作而成，但不限于此，也可采用物理气相沉积工艺等；而有有机封装层115b可采用喷墨打印工艺制作，但不限于此，也可采用喷涂工艺等。在制作有机封装层115b的过程中，由于有机封装材料具有一定的流动性，因此，通过设置第一封装挡墙208和第二封装挡墙209可对有机封装材料的流动形成限制，避免引起封装失效的问题。
需要说明的是，第一无机封装层115a和第二无机封装层115c还可覆盖防裂纹挡块207及防裂纹挡墙206，但不限于此，视具体情况而定。
如图11所示，外围区20中靠近显示区10的部分还可设置一些电路结构，比如：外围走线210、第一外围转接线211和第二外围转接线212。其中，外围走线210可源电极102c和漏电极102d同层设置，第一外围转接线211可与阳极111同层设置；第二外围转接线212可与显示区10a的转接电极109同层设置。其中，外围走线210可位于第一封装挡墙208和第二封装挡墙209的下方，第一外围转接线211可位于第二封装挡墙209中第三层208a与第四层208b之间；第二外围转接线212可位于第一封装挡墙208和第二封装挡墙209的下方。
此外，如图11所示，第二封装挡墙209的下方可设置有第一图案块213，以垫高第二封装挡墙209；第一图案块213可与第二平坦化层110同层设置。第一封装挡墙208的下方可设置有第二图案块214，以垫高第一封装挡墙208；第二图案块214可与第一平坦化层108同层设置。
需要说明的是，外围区20中电路结构的设计不限于此，视具体情况而定。
其中，如图9所示，柔性显示装置1还包括至少位于显示区10的触控基板1e，触控基板1e位于偏光片1b靠近显示基板1a的一侧，且位于封装层115背离柔性基底101的一侧。具体地，此触控基板1e可包括位于发光结构层远离驱动电路层的触控电极层116和位于触控电极层116远离显示基板1a一侧的有机保护层117，其中，触控电极层116可包括相互绝缘的接收电极和发射电极；有机保护层117的材料可包括PI、亚克力 或聚对苯二甲酸乙二醇酯等。
需要说明的是，触控基板1e的部分也可位于部分外围区20，视具体情况而定。此外，触控基板1e的位置不限于此，也可设置在偏光片1b背离柔性基底101的一侧，视具体情况而定。
在本公开一实施例中，防裂纹挡墙206可与第一平坦化层108、第二平坦化层110、像素定义层112和有机保护层117中的至少一者同层设置并相互断开；如图10所示，防裂纹挡墙206可包括与第一平坦化层108同层设置并相互断开的第五层206a、与第二平坦化层110同层设置并相互断开的第六层206b、与有机保护层117同层设置并相互断开的第七层206c，但应当理解的是，防裂纹挡墙206的结构不限于此，视具体情况而定。
同理，防裂纹挡块207可与第一平坦化层108、第二平坦化层110、像素定义层112和有机保护层117中的至少一者同层设置并相互断开，如图10所示，防裂纹挡墙206可包括与第一平坦化层108同层设置并相互断开的第八层207a、与第二平坦化层110同层设置并相互断开的第九层207b、与有机保护层117同层设置并相互断开的第十层207c，但应当理解的是，防裂纹挡块207的结构不限于此，视具体情况而定。
可选地，防裂纹挡墙206和防裂纹挡块207中有机膜层的层数相同，并一一对应，其中，防裂纹挡墙206和防裂纹挡块207对应层数的膜层同层设置并相互断开。由于防裂纹挡块207的膜层与防裂纹挡墙206的膜层一致，因此，在掩膜板设计时，可采用与防裂纹挡墙206一致的膜层堆叠设计，镀膜时工艺同步进行，不新增加工序，维持产品生产Tact Time(节拍时间)，不增加模具和生产成本。
可选地，防裂纹挡块207中远离防裂纹基底205的表面可与防裂纹挡墙206中远离防裂纹基底205的表面相平齐。
其中，如图10所示，防裂纹挡墙206的厚度h可约为4μm至5μm，比如：4μm、4.5μm、5μm等等，可增加对裂纹的阻挡作用，体现防裂纹挡墙206的优势。
应当理解的是，本公开实施例的显示区还可进行开孔设计，此开孔(图中未示出)可用于装配摄像头、传感器、HOME键、听筒或扬声器等功能器件。
此外，还应当理解的是，在不冲突的情况下，上述公开的实施例及实施例中的特征可以相互组合。
本公开实施例还提供了一种电子设备，其包括上述任一实施例所描述的柔性显示装置1。
根据本公开的实施例，该电子设备的具体类型不受特别的限制，本领域常用的电子设备类型均可，具体例如OLED显示器、手机、平板电脑、笔记本电脑等移动装置、手表、手环等可穿戴设备，本领域技术人员可根据该具体用途进行相应地选择，在此不再 赘述。
需要说明的是，该电子设备除了柔性显示装置1以外，还包括其他必要的部件和组成，以显示器为例，具体例如外壳、电源线，驱动芯片等等，本领域技术人员可根据该显示装置的具体使用要求进行相应地补充，在此不再赘述。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由所附的权利要求指出。

Claims (23)

  1. 一种柔性显示装置，其中，所述柔性显示装置包括依次层叠的显示基板、偏光片及第一光学胶层；所述柔性显示装置具有显示区和环绕所述显示区设置的外围区，所述外围区包括在第一方向上延伸的第一侧边区、在第二方向上延伸的第二侧边区、以及位于所述第一侧边区和所述第二侧边区之间的弧形拐角区；
    其中，所述弧形拐角区具有依次首尾相连的第一边、内弧边、第二边及外弧边，所述第一边与所述第一侧边区相接，所述第二边与所述第二侧边区相接；所述弧形拐角区包括具有所述第一边的第一拐角区和具有所述第二边的第二拐角区，且所述弧形拐角区的中心位置位于所述第一拐角区；所述弧形拐角区能够弯曲，且所述第一拐角区的弯曲角度大于所述第二拐角区的弯曲角度；在所述第一拐角区中，所述偏光片和/或所述第一光学胶层在参考平面上的正投影的外轮廓位于所述显示基板在所述参考平面上的正投影的外轮廓的外侧；
    其中，所述显示基板包括至少位于所述第一拐角区的防裂纹基底、防裂纹挡墙及多个防裂纹挡块；所述防裂纹挡墙形成在所述防裂纹基底上并位于所述显示区的外侧；所述多个防裂纹挡块形成在所述防裂纹基底上并位于所述防裂纹挡墙远离所述显示区一侧；
    所述第一方向与所述第二方向相交；所述参考平面为与所述第一方向和所述第二方向相平行的平面。
  2. 根据权利要求1所述的柔性显示装置，其中，所述防裂纹基底、所述防裂纹挡墙及所述防裂纹挡块还位于所述第二拐角区；
    所述多个防裂纹挡块划分成至少两排防裂纹挡块组，每排所述防裂纹挡块组包括多个按照所述显示基板中位于所述弧形拐角区的部分在所述参考平面上的正投影的外轮廓进行排布的所述防裂纹挡块；其中，
    每排所述防裂纹挡块组中相邻所述防裂纹挡块的中间区域相接触，且其两侧区域之间具有缝隙；
    在相邻两排所述防裂纹挡块组中，一排中防裂纹挡块与另一排中相邻防裂纹挡块之间的缝隙相对应。
  3. 根据权利要求2所述的柔性显示装置，其中，所述防裂纹挡块在所述参考平面中的正投影包括距离最远的第一点和第二点；
    在相邻两排所述防裂纹挡块组中，一排中防裂纹挡块的第一点和第二点与另一排中相邻防裂纹挡块之间的相接点位于同一条直线上。
  4. 根据权利要求3所述的柔性显示装置，其中，
    所述防裂纹挡块在所述参考平面中的正投影形状为四边形；所述显示基板中位于所述弧形拐角区的部分在所述参考平面上的正投影的外轮廓线为圆弧线；
    所述四边形具有第一对角线和第二对角线，所述第一对角线的两端点分别为所述第一点和所述第二点，且所述第一对角线的长度大于所述第二对角线的长度；其中，所述第一对角线和所述圆弧线中与所述第一对角线对应的切点的法线之间的夹角为锐角。
  5. 根据权利要求4所述的柔性显示装置，其中，
    所述第一对角线和所述弧线中与所述第一对角线对应的切点的法线之间的夹角为5°至30°。
  6. 根据权利要求4所述的柔性显示装置，其中，所述四边形关于所述第一对角线呈对称设置。
  7. 根据权利要求6所述的柔性显示装置，其中，
    位于最靠近所述外弧边的防裂纹挡块组中的所述防裂纹挡块在所述参考平面中的正投影形状为菱形。
  8. 根据权利要求2所述的柔性显示装置，其中，所述防裂纹基底、所述防裂纹挡块及所述防裂纹挡墙均由至少一层有机膜层构成。
  9. 根据权利要求8所述的柔性显示装置，其中，
    在所述显示区中，所述显示基板包括柔性基底，所述柔性基底包括依次层叠的第一有机基底层、无机阻挡层、第二有机基底层和无机缓冲层；
    所述防裂纹基底与所述第一有机基底层和所述第二有机基底层中的至少一者一体形成。
  10. 根据权利要求9所述的柔性显示装置，其中，
    所述显示基板还包括位于所述显示区的驱动电路层和发光结构层，所述驱动电路层设置在所述无机缓冲层上，所述发光结构层设置在所述驱动电路层远离所述无机缓冲层的一侧；所述驱动电路层包括薄膜晶体管，所述发光结构层包括覆盖所述薄膜晶体管的第一平坦化层、形成在所述第一平坦化层上的转接电极、覆盖所述转接电极的第二平坦化层以及依次形成在所述第二平坦化层上的阳极和像素定义层，所述阳极通过过孔与所述转接电极电连接，所述转接电极通过过孔与所述薄膜晶体管电连接，所述像素定义层上开设有露出所述阳极的像素开口，所述第一平坦化层、所述第二平坦化层和所述像素定义层的材料为有机材料；
    所述柔性显示装置还包括至少位于所述显示区触控基板，所述触控基板位于所述偏光片靠近所述显示基板的一侧，所述触控基板包括位于所述发光结构层远 离所述驱动电路层的触控电极层和位于所述触控电极层远离所述显示基板一侧的有机保护层；
    所述防裂纹挡墙与所述第一平坦化层、所述第二平坦化层、所述像素定义层和所述有机保护层中的至少一者同层设置并相互断开；
    所述防裂纹挡块与所述第一平坦化层、所述第二平坦化层、所述像素定义层和所述有机保护层中的至少一者同层设置并相互断开。
  11. 根据权利要求10所述的柔性显示装置，其中，
    所述防裂纹挡墙和所述防裂纹挡块中有机膜层的层数相同，并一一对应。
  12. 根据权利要求11所述的柔性显示装置，其中，
    所述防裂纹挡块中远离所述防裂纹基底的表面与所述防裂纹挡墙中远离所述防裂纹基底的表面相平齐。
  13. 根据权利要求12所述的柔性显示装置，其中，所述防裂纹挡墙的厚度为4μm至5μm。
  14. 根据权利要求10所述的柔性显示装置，其中，
    所述显示基板还包括位于所述外围区并环绕所述显示区的第一封装挡墙和第二封装挡墙，所述第一封装挡墙位于所述防裂纹挡墙靠近所述显示区的一侧，所述第二封装挡墙位于所述第一封装挡墙靠近所述显示区的一侧，所述第一封装挡墙的高度大于所述第二封装挡墙的高度；
    所述第一封装挡墙与所述第二平坦化层、所述像素定义层中的至少一者同层设置并相互断开；
    所述第二封装挡墙与所述第二平坦化层、所述像素定义层中的至少一者同层设置并相互断开。
  15. 根据权利要求2所述的柔性显示装置，其中，
    所述至少两排防裂纹挡块组位于所述第一拐角区；且所述至少两排防裂纹挡块组中远离所述显示区的部分防裂纹挡块组延伸至所述第二拐角区。
  16. 根据权利要求15所述的柔性显示装置，其中，
    位于所述第一拐角区中所述防裂纹挡块组设置有三排；其中，三排所述防裂纹挡块组中靠近所述外弧边的两排所述防裂纹挡块组延伸至所述第二拐角区。
  17. 根据权利要求2所述的柔性显示装置，其中，
    所述防裂纹挡墙设置有多圈，相邻两圈所述防裂纹挡墙之间具有缝隙；
    其中，多圈所述防裂纹挡墙位于所述第一拐角区，且多圈所述防裂纹挡墙中远离所述显示区的部分所述防裂纹挡墙延伸至所述第二拐角区、所述第一侧边区 和所述第二侧边区。
  18. 根据权利要求1至17中任一项所述的柔性显示装置，其中，
    在所述第一拐角区，所述偏光片和所述第一光学胶层在参考平面上的正投影的外轮廓均位于所述显示基板在所述参考平面上的正投影的外轮廓的外侧，且所述偏光片在参考平面上的正投影的外轮廓与所述第一光学胶层在参考平面上的正投影的外轮廓重合。
  19. 根据权利要求18所述的柔性显示装置，其中，所述第一拐角区包括第一子区和位于所述第一子区靠近所述第一侧边区的第二子区，其中，所述弧形拐角区的中心位置位于所述第一子区；
    在所述第一子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第一距离；
    在所述第二子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第二距离；
    其中，所述第二距离大于所述第一距离。
  20. 根据权利要求19所述的柔性显示装置，其中，所述第一拐角区还包括第三子区和第四子区；所述第三子区位于所述第一子区靠近所述第二拐角区的一侧，所述第四子区位于所述第二子区靠近所述第一侧边区的一侧，；
    在所述第三子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第三距离；
    在所述第四子区中，所述偏光片在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓之间具有第四距离；
    其中，所述第三距离小于所述第一距离，所述第四距离小于所述第二距离。
  21. 根据权利要求18所述的柔性显示装置，其中，
    在所述第二拐角区中，所述偏光片和所述第一光学胶层在所述参考平面上的正投影的外轮廓与所述显示基板在所述参考平面上的正投影的外轮廓的重合。
  22. 根据权利要求1所述的柔性显示装置，其中，还包括盖板，位于所述第一光学胶层远离所述偏光片的一侧；
    其中，所述偏光片和所述第一光学胶层在参考平面上的正投影的外轮廓位于所述盖板在所述参考平面上的正投影的外轮廓内或与之重合。
  23. 一种电子设备，其中，包括权利要求1至22中任一项所述的柔性显示装置。
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