WO2022193376A1 - 柔性显示装置及其制备方法 - Google Patents

柔性显示装置及其制备方法 Download PDF

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Publication number
WO2022193376A1
WO2022193376A1 PCT/CN2021/085305 CN2021085305W WO2022193376A1 WO 2022193376 A1 WO2022193376 A1 WO 2022193376A1 CN 2021085305 W CN2021085305 W CN 2021085305W WO 2022193376 A1 WO2022193376 A1 WO 2022193376A1
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WIPO (PCT)
Prior art keywords
bending
plane
flexible display
curved
display device
Prior art date
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Ceased
Application number
PCT/CN2021/085305
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English (en)
French (fr)
Inventor
覃黎君
段艳强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Filing date
Publication date
Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to US17/419,743 priority Critical patent/US12016139B2/en
Publication of WO2022193376A1 publication Critical patent/WO2022193376A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • 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 OR CALCULATING; 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
    • G06F1/1601—Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • 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 application relates to the technical field of flexible displays, and in particular, to a flexible display device and a manufacturing method thereof.
  • the thinner the thickness of the flexible display device the greater the curvature of the curved portion, and the greater the stress on the connection between the curved portion and the non-curved portion, which is prone to breakage and peeling of the circuit.
  • the yield rate dropped significantly. Due to this limitation, the thickness of the current flexible display devices in the industry cannot be further reduced, and the development of thin and light flexible display devices has encountered a technical bottleneck.
  • Embodiments of the present application provide a flexible display device and a manufacturing method thereof, so as to solve the technical problem of circuit breakage and peeling caused by excessive bending stress on the flexible display panel at a preset bending position when the thickness of the flexible display device is too small .
  • An embodiment of the present application provides a flexible display device, including: a flexible display panel, the flexible display panel is bent at a preset position to form a first plane part, a curved part and a second plane part, the curved part is located in the first plane part Between a plane portion and the second plane portion; the preset position includes a first inflection point on the surface of the abutment between the curved portion and the first plane portion, and a first inflection point located between the curved portion and the first plane portion A second inflection point of the abutment surface of a second plane portion, the first plane portion being located on the first plane, the first inflection point and the second inflection point being located at a second point perpendicular to the first plane On a plane; the distance between the first bending point and the second bending point is H, the bending axis of the bending part is perpendicular to the second plane, the first bending point and the second bending point are The midpoint of the line connecting the points is located on the
  • the second plane portion is parallel to the first plane; on the second plane, the vertex of the curved portion of the curved portion and the first plane portion are The distance between them is equal to the distance between the vertex of the curved surface and the second plane portion.
  • the difference between the maximum radius of curvature r of the curved portion and the minimum radius of curvature H/2 is at least greater than 120 ⁇ m.
  • the bending axis of the bending portion is perpendicular to the second plane, and the midpoint of the line between the first bending point and the second bending point is located at the on the bending axis; the included angle between the plane formed by the apex of the curved surface of the bending portion and the bending axis and the first plane portion ranges from 0 degrees to 30 degrees.
  • the plane formed by the apex of the curved surface of the curved portion on the second plane and the curved axis of the curved portion is the same as the first plane portion and/or the plane formed by the curved axis of the curved portion.
  • the included angle between the second plane portions ranges from 0 degrees to 30 degrees.
  • the flexible display device further includes: a backplane, the flexible display panel is disposed on the backplane, and the backplane is disposed corresponding to the first plane portion
  • a backplane the flexible display panel is disposed on the backplane
  • the backplane is disposed corresponding to the first plane portion
  • There is a first back plate the first plane part is located on the first back plate
  • the back plate is provided with a groove part corresponding to the curved part, and the curved part is opposite to the groove part
  • the backplane is provided with a second backplane corresponding to the second plane portion, the second plane portion is located on the second backplane
  • the second plane portion is bent to the first backplane
  • the design value of the length L of the groove portion before bending satisfies the following formula:
  • ⁇ is the correction value of the bending process accuracy
  • H is the distance between the first bending point and the second bending point
  • h is the thickness of the flexible display panel.
  • the bending process accuracy correction value ⁇ satisfies the following formula:
  • A is the manufacturing accuracy of the groove portion
  • B is the fitting accuracy of the flexible display panel and the backplane
  • C is the bending alignment accuracy of the first backplane and the second backplane .
  • a composite support structure is further included, the composite support structure is located between the bent first plane portion and the second plane portion, the composite support structure is respectively Abutting with the first backplane and the second backplane, the distance H between the first inflection point and the second inflection point satisfies the following formula:
  • h is the thickness of the flexible display panel
  • a is the thickness of the backplane
  • b is the thickness of the composite support structure.
  • the curved portion includes an elliptical curved surface.
  • the curved portion on the second plane, has a curved apex, and the curvature radius of the curved portion is in a region from the first curved point to the curved apex
  • the radius of curvature of the curved portion gradually decreases in the region from the vertex of the curved surface to the second bending point.
  • the curvature radius of the curved portion varies between a minimum curvature radius H/2 and a maximum curvature radius r.
  • Embodiments of the present application also provide a method for preparing the aforementioned flexible display device, including:
  • ⁇ is the correction value of the bending process accuracy
  • H is the target distance between the first bending point and the second bending point
  • h is the thickness of the flexible display panel
  • the bending device of the flexible display panel presets the bending trajectory of the bending portion according to the length L of the groove portion and the target distance H between the first bending point and the second bending point , so that the distance between the vertex of the curved surface of the curved portion on the second plane and the first plane portion is equal to the distance between the vertex of the curved surface and the second plane portion;
  • the bending device bends the flexible display panel according to the preset bending trajectory, so that the difference between the maximum curvature radius r of the bending portion and the H/2 is at least greater than 120 ⁇ m.
  • the step B2 further includes: presetting a bending trajectory of the bending portion, so that the bending axis of the bending portion is perpendicular to the second plane, and the first The midpoint of the line between the bending point and the second bending point is located on the bending axis; the plane formed by the curved vertex of the curved portion after bending and the bending axis and the first plane
  • the included angle of the parts ranges from 0 degrees to 30 degrees.
  • the bending process accuracy correction value ⁇ satisfies the following formula:
  • A is the manufacturing accuracy of the groove portion
  • B is the fitting accuracy of the flexible display panel and the backplane
  • C is the bending alignment accuracy of the first backplane and the second backplane .
  • the flexible display device further includes a composite support structure
  • the step B3 includes: the first plane portion is located on one side of the composite support structure, and the The two plane parts are bent to the other side of the composite support structure, so that the composite support structure abuts against the first backboard and the second backboard respectively, and the first bending point is connected to the second backboard.
  • the distance H between the inflection points satisfies the following formula:
  • h is the thickness of the flexible display panel
  • a is the thickness of the backplane
  • b is the thickness of the composite support structure.
  • the curved trajectory of the curved portion includes an elliptical curved surface.
  • the curved trajectory of the curved portion is preset, so that the radius of curvature of the curved portion is from the first curved point to the vertex of the curved surface.
  • the radius of curvature of the curved portion gradually decreases in the region from the vertex of the curved surface to the second bending point.
  • the curved trajectory of the curved portion is preset, so that on the second plane, the radius of curvature of the curved portion is within the minimum radius of curvature. Variation between H/2 and the maximum radius of curvature r.
  • the step B3 includes: the bending device bends the flexible display panel according to the preset bending trajectory, so that the maximum curvature radius r of the bending part is the same as that of the bending part.
  • the difference in H/2 is at least greater than 200 ⁇ m.
  • the distance between the first bending point and the second bending point located at both ends of the bending portion is reduced, and the maximum curvature radius r of the bending portion is elongated so that the maximum curvature radius r of the bending portion is greater than Half of the distance between the first bending point and the second bending point, that is, let the curved surface of the bending part include an elliptical curved surface, so as to reduce the bending stress at the first bending point and the second bending point, and avoid the circuit on the flexible display panel due to damage. Excessive bending stress will cause defects such as fracture and peeling, which significantly improves the production yield of ultra-thin flexible display panels.
  • FIG. 1 is a schematic side view of a first embodiment of a flexible display device provided by the present application.
  • FIG. 2 is a schematic structural diagram of the flexible display panel and the back panel in FIG. 1 before they are bent;
  • FIG. 3 is a schematic side view of a second embodiment of the flexible display device provided by the present application.
  • FIG. 4 is an experimental test diagram of the flexible display device provided by the present application.
  • the present application provides a reference coordinate axis, which specifically includes an XY plane, a YZ plane, and an XZ plane defined by the first direction X, the second direction Y, and the third direction Z, so as to explain the technical solution of the present application more clearly.
  • a flexible display device 100 including a flexible display panel 1 , a backplane 2 , a composite support structure 3 , a polarizer 4 , a cover plate 5 and a protective layer 6 .
  • the flexible display panel 1 includes a display area AA for displaying pictures.
  • the plane where the display area AA is located is parallel to the XY plane.
  • the flexible display panel 1 can be bent at a preset position.
  • the flexible display panel 1 may be divided into a first flat part 11 , a curved part 12 and a second flat part 13 which are connected in sequence.
  • the curved portion 12 is located between the first flat portion 11 and the second flat portion 13 .
  • the first plane 110 on which the first plane portion 11 is located is parallel to the XY plane.
  • the display area AA is located on the first plane portion 11 .
  • the display area AA is provided with pixels for displaying pictures (not shown in the figure) and signal lines (not shown in the figure) for conducting driving signals.
  • the specific pixel and circuit structure can adopt the existing technology in the industry. This is not specifically limited.
  • the preset position specifically includes a first inflection point M on the surface where the curved portion 12 and the first plane portion 11 abut, and a second inflection point N on the surface where the curved portion 12 and the second plane portion 13 abut.
  • the first inflection point M is located on the side surface of the first plane portion 11 close to the polarizer.
  • the second inflection point N is located on the side surface of the second plane portion 13 away from the polarizer. Both the first inflection point M and the second inflection point N are located on the second plane 130 perpendicular to the first plane 110 .
  • the second plane 130 is parallel to the XZ plane.
  • the degree of deformation of the first flat portion 11 and the second flat portion 13 is smaller than that of the curved portion 12 .
  • the first plane portion 11 and the second plane portion 13 may not need to provide a flat surface.
  • the entire portion of the flexible display panel 1 may be bent or rolled.
  • the curved part 12 is not limited to the curved part in the flexible display panel 1 as shown in the drawings, and any part of the flexible display panel 1 can be bent into the first flat part 11 , the curved part 12 and the second flat part by bending At least one of 13.
  • the curved portion 12 On the second plane, the curved portion 12 has an elliptical shape.
  • the first inflection point M and the second inflection point N are located at both ends of the curved portion 12, respectively.
  • the distance between the first inflection point M and the second inflection point N is H.
  • the midpoint of the connecting line between the first bending point M and the second bending point N is set as a vertical line perpendicular to the second plane, and the bending axis P of the bending portion 12 can be obtained.
  • the radius of curvature of the bend 12 may be defined as the shortest distance from the bend axis P to a specified point on the surface of the bend 12 remote from the bend axis P.
  • the radius of curvature of the curved portion 12 at points M and N is H/2
  • the radius of curvature of the point O farthest from the bending axis P on the curved portion 12 is r.
  • the distance from the bending axis P to the surface of the bending portion 12 remote from the bending axis P varies continuously between H/2 and r.
  • the curved portion 12 has a radius of curvature that varies between H/2 and r.
  • the radius of curvature at the vertex O of the curved surface is the maximum radius of curvature r, and r is greater than H/2.
  • the curvature radius of the curved portion 12 gradually increases in the region from the first inflection point M to the curved surface vertex O.
  • the radius of curvature of the curved portion 12 gradually decreases in the region from the vertex O of the curved surface to the second bending point N.
  • the curved portion 12 may include multiple curved structures, and as long as the radius of curvature of at least one point in the curved portion 12 is greater than H/2, the first curved portion can be reduced to a certain extent Stress at point M and second inflection point N.
  • the backplane 2 includes a first backplane 21 corresponding to the first plane portion 11 and a second backplane 23 corresponding to the second plane portion 13 .
  • a groove portion 22 corresponding to the curved portion 12 is formed between the first back plate 21 and the second back plate 23 .
  • the backplane 2 can be made of PI (Polyimide, polyimide) and/or PET (Polyethylene) that can isolate water and oxygen. Terephthalate, polyethylene terephthalate) and other organic insulating materials.
  • the flexible display panel 1 is formed on the backplane 2 .
  • the first plane portion 11 is located on the first backplane 21 .
  • the curved portion 12 is disposed opposite to the groove portion 22 .
  • the second plane portion 13 is located on the second back plate 23 .
  • the groove portion 22 may penetrate the backboard 2 along the thickness direction of the backboard 2 to expose part of the flexible display panel 1 , so as to improve the flexibility of the flexible display panel 1 at the bending portion 12 as much as possible.
  • the target distance H between the first bending point M and the second bending point N may also be determined. Since the length of the curved segment obtained by bending the curved portion 12 is approximately the same as the length L of the groove portion 22 , the maximum radius of curvature r on the curved portion 12 is determined by the length L of the groove portion 22 before bending.
  • the present application provides a design formula for the length L of the groove portion 22 before bending, which is as follows:
  • ⁇ is the correction value of the bending process accuracy
  • H is the distance between the first bending point M and the second bending point N
  • h is the thickness of the flexible display panel 1 .
  • A is the manufacturing accuracy of the groove portion 22
  • B is the bonding accuracy of the flexible display panel 1 and the backplane 2
  • C is the bending alignment accuracy of the first backplane 21 and the second backplane 23 .
  • the bending device of the flexible display panel 1 can calculate the length L of the groove part and the distance between the first bending point M and the second bending point N
  • the target distance H is used to preset the curved trajectory of the curved portion 12 to obtain the r value.
  • the composite support structure 3 is located between the curved first planar portion 11 and the second planar portion 13 .
  • the composite supporting structure 3 includes a supporting layer 31 and an adhesive layer 32 , and the supporting layer 31 is arranged on the adhesive layer 32 .
  • the support layer 31 includes a metal heat dissipation layer (not shown in the figure), a foam support layer (not shown in the figure) and other composite structures.
  • the first backplane 21 is located between the support layer 31 and the first plane portion 11 .
  • One surface of the support layer 31 is in contact with the first backplane 21 and is pasted and fixed.
  • the sticking layer 32 can use a common double-sided tape. The sticking layer 32 sticks and fixes the other side surface of the support layer 31 and the surface of the second backplane 23 .
  • the protective layer 6 often uses UV glue.
  • the protective layer 6 is used to protect the curved portion 12 of the flexible display panel 1 from being damaged by external force.
  • One end of the protective layer 6 extends to the surface of the first plane portion 11 , and the other end extends to the surface of the second plane portion 13 .
  • the distance H between the first inflection point M and the second inflection point N satisfies the following formula:
  • h is the thickness of the flexible display panel 1
  • a is the thickness of the backplane 2
  • b is the thickness of the composite support structure 3 .
  • the radius of curvature of the curved portion is constant and equal to H/2.
  • the distance H between the first bending point M and the second bending point N is constantly decreasing, and the radius of curvature of the bending portion is correspondingly reduced.
  • the smaller the curvature radius of the curved portion is, the greater the bending stress the flexible display panel bears at the two stress concentration points, the first bending point M and the second bending point N.
  • the embodiment of the present application proposes to reduce the H value of the curved portion 12 at the first bending point M and the second bending portion by elongating the maximum curvature radius r of the curved portion 12 to make the curved portion 12 elliptical, while reducing the H value adaptively.
  • the bending angle at the point N further reduces the bending stress at the first bending point M and the second bending point N, thereby solving the above-mentioned technical problems.
  • the plane where the second plane portion 13 is located is parallel to the XY plane and the first plane 110 .
  • the end point N of the upper surface of the second plane portion 13 and the end point M of the upper surface of the first plane portion 11 are vertically aligned on the second plane 130 shown in the figure, so that the distance between the point O of the curved surface of the curved portion 12 and the first plane portion 11 and the distance between the vertex O of the curved surface and the second plane portion 13 is equal.
  • the maximum curvature radius r of the curved portion 12 at the vertex O of the curved surface is at least 120 ⁇ m larger than the minimum curvature radius H/2 at the first bending point M and the second bending point N.
  • the maximum curvature radius r of the curved portion 12 at the vertex O of the curved surface is at least 200 ⁇ m larger than the minimum curvature radius H/2 at the first bending point M and the second bending point N.
  • the curved vertex O of the curved portion 12 can also be designed to be close to the first plane portion 11 or the second plane portion 13, so as to adapt to different application scenarios or matches. different shells.
  • the included angle between the plane formed by the curved vertex O of the curved portion 12 and the bending axis P and the XY plane ranges from 0 degrees to 30 degrees. That is, the vertex O of the curved surface of the curved portion 12 may be offset within 30 degrees in the direction close to the first plane portion 11 or the second plane portion 13 .
  • the flexible display panel 1 may also have various bending angles.
  • the drawings only show the flexible display device in which the first plane part 11 and the second plane part 13 are parallel to each other as an example.
  • the included angle between the plane where the first plane portion 11 and the second plane portion 13 are located may be 60 degrees or 90 degrees, etc., which is not specifically limited here.
  • the frame width of the flexible display device 100 is widened. As shown in FIG. 1 , the frame width of the flexible display device 100 includes the width W of the non-display area and the maximum curvature radius r of the curved portion 12 .
  • the present application provides a second embodiment as shown in FIG. 3 .
  • the width W' of the non-display area in the second embodiment is smaller than the width W of the non-display area in the first embodiment.
  • the sum of W' and r is smaller than or equal to the sum of W and r in the first embodiment, thereby ensuring that the width of the frame of the flexible display device 100 remains unchanged or reduced, which is in line with the current narrow frame. design trends.
  • the width W' of the non-display area can be realized by compressing the area of the wiring in the fan-shaped area, adjusting the position of the driving control circuit, etc., which is not specifically limited here.
  • the present application also provides a method for preparing the aforementioned flexible display device 100, which specifically includes:
  • H is the target distance between the first bending point M and the second bending point N
  • h is the thickness of the flexible display panel 1
  • ⁇ is the correction value of the bending process accuracy
  • A is the manufacturing accuracy of the groove portion 22
  • B is the bonding accuracy of the flexible display panel 1 and the backplane 2
  • C is the bending alignment accuracy of the first backplane 21 and the second backplane 23 .
  • the bending device of the flexible display panel 1 can preset the bending of the bending portion 12 according to the length L of the groove portion obtained in step B1 and the target distance H between the first bending point M and the second bending point N trajectory.
  • the curved trajectory of the curved portion 12 includes an elliptical curved surface, the distance between the curved surface vertex O of the curved portion 12 and the first plane portion 11 and the distance between the curved surface vertex O and the second plane portion 13 equal distances.
  • the radius of curvature r at the vertex O of the surface is greater than H/2.
  • the bending device bends the flexible display panel 1 according to a preset bending trajectory, so that the difference between the maximum curvature radius r of the bending portion 12 and H/2 is at least greater than 120 ⁇ m.
  • FIG. 4 shows the stress test of the flexible display device provided by the present application in a laboratory.
  • the figure shows the ideal state when the fracture difference of the back plate 2 is 0, that is, when the dislocation distance between the curved edges of the first back plate 21 and the second back plate 23 is 0, the curved portion 12 is simulated by using a perfect semicircle design.
  • the average stress at the first bending point M and the second bending point N is 1134 MPa, and the bending part 12 adopts the non-regular semicircle design simulation to obtain the average stress at the first bending point M and the second bending point N is 1022 Mpa.
  • the 112Mpa stress can be reduced using the design of the present application.
  • the alignment error of the curved rear edges of the first backplane 21 and the second backplane 23 cannot be avoided.
  • the measured fracture difference of the back plate 2 is 220 ⁇ m, that is, when the dislocation distance between the curved edges of the first back plate 21 and the second back plate 23 is 220 ⁇ m
  • the curved part 12 adopts a perfect semicircle design to obtain the first bending point M and the second bending point M.
  • the average stress at the bending point N is 2858 MPa, and the average stress at the first bending point M and the second bending point N is measured to be 1769 MPa by using the non-regular semicircle design of the bending part 12 .
  • the 1089Mpa stress can be reduced by using the design of the present application.
  • the present application adaptively reduces the distance H between the first bending point M and the second bending point N on the surfaces of both ends of the curved portion 12 , and lengthens the maximum curvature of the curved portion 12 .
  • the radius r makes r greater than H/2, so that the curved surface of the curved portion 12 includes an elliptical curved surface, thereby reducing the bending stress at the first bending point M and the second bending point N, and avoiding the circuit on the flexible display panel due to excessive bending stress. Defects such as breakage and peeling occur, which significantly improves the mass production yield of ultra-thin flexible display panels.
  • the technical solution proposed in the present application breaks the technical bottleneck in the prior art that the distance H between the first bending point M and the second bending point N cannot be further reduced due to the curvature radius R of the bending portion 12 .
  • the H thickness value ranges from 0.5 mm to 0.7 mm.
  • the above H value can be reduced to less than 0.5 mm, and the thickness of the flexible display device can be further improved while ensuring the mass production yield. compression is possible.

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Abstract

一种柔性显示装置（100）及其制备方法，包括柔性显示面板（1），柔性显示面板（1）在预设位置弯曲以形成第一平面部（11）、弯曲部（12）和第二平面部（13）；预设位置包括第一弯曲点（M）和第二弯曲点（N），第一弯曲点（M）与第二弯曲点（N）之间的距离为H，第一弯曲点（M）与第二弯曲点（N）连线的中点位于弯曲部（12）的弯曲轴（P）上，弯曲部（12）上至少有一点的曲率半径（r）大于H/2。

Description

柔性显示装置及其制备方法 技术领域
本申请涉及柔性显示技术领域，具体涉及一种柔性显示装置及其制备方法。
 背景技术
随着柔性显示技术的发展，柔性显示装置的轻薄化发展已成为业界主流。
但是，柔性显示装置的厚度越小，弯曲部的曲率就越大，弯曲部与非弯曲部的连接处受到的应力也越大，容易出现线路的断裂、剥离等不良，使柔性显示装置的量产良率大幅下降。受此限制，目前业内的柔性显示装置的厚度始终无法进一步减小，柔性显示装置的轻薄化发展遇到了技术瓶颈。
 技术问题
本申请实施例提供了一种柔性显示装置及其制备方法，以解决当柔性显示装置厚度过小时，柔性显示面板在预设弯曲位置出现因弯曲应力过大而导致的线路断裂和剥离的技术问题。
 技术解决方案
本申请实施例提供一种柔性显示装置，包括：柔性显示面板，所述柔性显示面板在预设位置弯曲以形成第一平面部、弯曲部和第二平面部，所述弯曲部位于所述第一平面部与所述第二平面部之间；所述预设位置包括位于所述弯曲部与所述第一平面部的邻接处表面的第一弯曲点，以及位于所述弯曲部与所述第二平面部的邻接处表面的第二弯曲点，所述第一平面部位于第一平面上，所述第一弯曲点和所述第二弯曲点位于与所述第一平面垂直的第二平面上；所述第一弯曲点与所述第二弯曲点之间的距离为H，所述弯曲部的弯曲轴垂直于所述第二平面，所述第一弯曲点与所述第二弯曲点之间连线的中点位于所述弯曲轴上；在所述第二平面上，所述弯曲部上至少有一点的曲率半径大于H/2。
可选的，在本申请的一些实施例中，所述第二平面部平行于所述第一平面；在所述第二平面上，所述弯曲部的曲面顶点与所述第一平面部之间的距离和所述曲面顶点与所述第二平面部之间的距离相等。
可选的，在本申请的一些实施例中，所述弯曲部的最大曲率半径r与所述最小曲率半径H/2的差值至少大于120μm。
可选的，在本申请的一些实施例中，所述弯曲部的弯曲轴垂直于所述第二平面，所述第一弯曲点与所述第二弯曲点之间连线的中点位于所述弯曲轴上；所述弯曲部的曲面顶点与所述弯曲轴所构成的平面与所述第一平面部的夹角范围在0度至30度之间。
可选的，在本申请的一些实施例中，所述弯曲部在所述第二平面上的曲面顶点与所述弯曲部的弯曲轴所构成的平面与所述第一平面部和/或所述第二平面部之间的夹角范围在0度至30度之间。
可选的，在本申请的一些实施例中，所述柔性显示装置还包括：背板，所述柔性显示面板设置在所述背板上，所述背板上对应所述第一平面部设置有第一背板，所述第一平面部位于所述第一背板上；所述背板上对应所述弯曲部设置有凹槽部，所述弯曲部与所述凹槽部相对设置；所述背板上对应所述第二平面部设置有第二背板，所述第二平面部位于所述第二背板上；所述第二平面部被弯折至所述第一背板上远离所述第一平面部的一侧，弯折前的所述凹槽部的长度L的设计值满足如下公式：
L=απ（H-h）/2
其中，α为弯曲工艺精度修正值，H为所述第一弯曲点与所述第二弯曲点之间的距离，h为所述柔性显示面板的厚度。
可选的，在本申请的一些实施例中，所述弯曲工艺精度修正值α满足如下公式：
α=√(A^2+B^2+C^2 ) 
其中，A为所述凹槽部的制造精度，B为所述柔性显示面板与所述背板的贴合精度，C为所述第一背板与所述第二背板的弯曲对位精度。
可选的，在本申请的一些实施例中，还包括复合支撑结构，所述复合支撑结构位于弯曲后的所述第一平面部和所述第二平面部之间，所述复合支撑结构分别与所述第一背板和所述第二背板抵接，所述第一弯曲点与所述第二弯曲点之间的距离H满足如下公式:
H=2（h+a）+b
其中，h为所述柔性显示面板的厚度，a为所述背板的厚度，b为所述复合支撑结构的厚度。
可选的，在本申请的一些实施例中，所述弯曲部包括椭圆曲面。
可选的，在本申请的一些实施例中，在所述第二平面上，所述弯曲部具有曲面顶点，所述弯曲部的曲率半径在所述第一弯曲点至所述曲面顶点的区域内逐渐增大，所述弯曲部的曲率半径在所述曲面顶点至所述第二弯曲点的区域内逐渐减小。
可选的，在本申请的一些实施例中，在所述第二平面上，所述弯曲部的曲率半径在最小曲率半径H/2与最大曲率半径r之间变化。
本申请实施例还提供了一种前述柔性显示装置的制备方法，包括：
B1、根据如下公式获得弯折前背板上开设的与所述弯曲部对应的凹槽部的长度L：
L=απ（H-h）/2
其中，α为弯曲工艺精度修正值，H为所述第一弯曲点与所述第二弯曲点之间的目标距离，h为所述柔性显示面板的厚度；
B2、所述柔性显示面板的弯折设备根据所述凹槽部的长度L和所述第一弯曲点与所述第二弯曲点之间的目标距离H，预设所述弯曲部的弯曲轨迹，使所述弯曲部在所述第二平面上的曲面顶点与所述第一平面部之间的距离和所述曲面顶点与所述第二平面部之间的距离相等；
B3、所述弯折设备按照预设的所述弯曲轨迹弯曲所述柔性显示面板，使所述弯曲部的最大曲率半径r与所述H/2的差值至少大于120μm。
可选的，在本申请的一些实施例中，所述步骤B2还包括：预设所述弯曲部的弯曲轨迹，使所述弯曲部的弯曲轴垂直于所述第二平面，所述第一弯曲点与所述第二弯曲点之间连线的中点位于所述弯曲轴上；弯曲后的所述弯曲部的所述曲面顶点与所述弯曲轴所构成的平面与所述第一平面部的夹角范围在0度至30度之间。
可选的，在本申请的一些实施例中，所述弯曲工艺精度修正值α满足如下公式：
α=√(A^2+B^2+C^2 ) 
其中，A为所述凹槽部的制造精度，B为所述柔性显示面板与所述背板的贴合精度，C为所述第一背板与所述第二背板的弯曲对位精度。
可选的，在本申请的一些实施例中，所述柔性显示装置还包括复合支撑结构，所述步骤B3包括：所述第一平面部位于所述复合支撑结构的一侧，将所述第二平面部弯曲至所述复合支撑结构的另一侧，使所述复合支撑结构分别与所述第一背板和所述第二背板抵接，所述第一弯曲点与所述第二弯曲点之间的距离H满足如下公式:
H=2（h+a）+b
其中，h为所述柔性显示面板的厚度，a为所述背板的厚度，b为所述复合支撑结构的厚度。
可选的，在本申请的一些实施例中，所述弯曲部的弯曲轨迹包括椭圆曲面。
可选的，在本申请的一些实施例中，在所述步骤B2中，预设所述弯曲部的弯曲轨迹，使所述弯曲部的曲率半径在所述第一弯曲点至所述曲面顶点的区域内逐渐增大，所述弯曲部的曲率半径在所述曲面顶点至所述第二弯曲点的区域内逐渐减小。
可选的，在本申请的一些实施例中，在所述步骤B2中，预设所述弯曲部的弯曲轨迹，使在所述第二平面上，所述弯曲部的曲率半径在最小曲率半径H/2与最大曲率半径r之间变化。
可选的，在本申请的一些实施例中，所述步骤B3包括：所述弯折设备按照预设的所述弯曲轨迹弯曲所述柔性显示面板，使所述弯曲部的最大曲率半径r与所述H/2的差值至少大于200μm。
 有益效果
在降低柔性显示装置厚度时，减小位于弯曲部两端的第一弯曲点与第二弯曲点之间的距离，并通过拉长所述弯曲部的最大曲率半径使弯曲部的最大曲率半径r大于第一弯曲点与第二弯曲点之间的距离的一半，即让弯曲部的曲面包括椭圆曲面，从而降低第一弯曲点与第二弯曲点处的弯曲应力，避免柔性显示面板上的线路因弯曲应力过大而产生断裂、剥离等不良，显著提高超薄柔性显示面板的生产良率。
 附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，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是本申请提供的柔性显示装置的第一实施例的侧面示意图；
图2是图1中柔性显示面板以及背板在弯折前的结构示意图；
图3是本申请提供的柔性显示装置的第二实施例的侧面示意图；
图4是本申请提供的柔性显示装置的实验测试图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请提供一参考坐标轴，具体包括由第一方向X、第二方向Y以及第三方向Z限定的XY平面、YZ平面以及XZ平面，以便更清楚的阐述本申请的技术方案。
本申请提供第一具体实施例如图1所示，提供一种柔性显示装置100包括柔性显示面板1、背板2、复合支撑结构3、偏光片4、盖板5以及保护层6。
柔性显示面板1包括用于显示画面的显示区AA。显示区AA所在平面与XY平面平行。为尽可能的减小柔性显示装置100的边框宽度，柔性显示面板1可在预设位置弯曲。当柔性显示面板1如图1所示弯曲时，柔性显示面板1可以划分为依次连接的第一平面部11、弯曲部12和第二平面部13。弯曲部12位于第一平面部11和第二平面部13之间。
第一平面部11所在的第一平面110与XY平面平行。显示区AA位于第一平面部11上。显示区AA上设置有用于显示画面的像素（图中未示出）和用于传导驱动信号的信号线（图中未示出），具体的像素和电路结构可采用业界现有的技术，在此不作具体限定。
预设位置具体包括位于弯曲部12与第一平面部11的邻接处表面的第一弯曲点M，以及位于弯曲部12与第二平面部13的邻接处表面的第二弯曲点N。第一弯曲点M位于第一平面部11上靠近偏光片的一侧表面。第二弯曲点N位于第二平面部13上远离偏光片的一侧表面。第一弯曲点M和第二弯曲点N都位于与第一平面110垂直的第二平面130上。第二平面130与XZ平面平行。第二平面130垂直于第一平面110。图1至图3为柔性显示装置在第二平面130上呈现的结构示意图。
可以理解的是，第一平面部11和第二平面部13的形变程度小于弯曲部12的形变程度。第一平面部11和第二平面部13可以不需要提供平整表面。在其他实施例中，柔性显示面板1的整个部分可被弯曲或卷绕。换句话说，弯曲部12不限于如附图所示的柔性显示面板1中的弯曲部分，柔性显示面板1的任何部分均可通过弯曲成为第一平面部11、弯曲部12以及第二平面部13中的至少一个。
在第二平面上，弯曲部12呈椭圆状。第一弯曲点M和第二弯曲点N分别位于弯曲部12的两端。第一弯曲点M和第二弯曲点N之间的距离为H。在第一弯曲点M与第二弯曲点N之间连线的中点作垂直于第二平面的垂线，即可获得弯曲部12的弯曲轴P。
在第二平面130上，弯曲部12的曲率半径可定义为从弯曲轴P到弯曲部12上远离所述弯曲轴P的表面上指定点的最短距离。比如，在图1所示的第二平面130中，弯曲部12在M点和N点的曲率半径为H/2，弯曲部12上距离弯曲轴P最远处O点的曲率半径为r。在第二平面130上，可看到弯曲轴P至弯曲部12上远离所述弯曲轴P的表面的距离在H/2和r之间不断变化。即弯曲部12具有在H/2至r之间不断变化的曲率半径。当弯曲部12呈如附图所示的椭圆状时，曲面顶点O处的曲率半径为最大曲率半径r，且r大于H/2。
在第二平面130上，弯曲部12的曲率半径在第一弯曲点M至曲面顶点O的区域内逐渐增大。在第二平面130上，弯曲部12的曲率半径在曲面顶点O至第二弯曲点N的区域内逐渐减小。
可以理解的是，在本申请的其他具体实施例中，弯曲部12可以包括多个曲面结构，只要弯曲部12中至少一点的曲率半径大于H/2，就能一定程度的减小第一弯曲点M与第二弯曲点N处的应力。
结合图2所示，背板2包括对应第一平面部11的第一背板21和对应第二平面部13的第二背板23。第一背板21和第二背板23之间形成有与弯曲部12相对应的凹槽部22。背板2可采用能隔离水、氧的PI（Polyimide，聚酰亚胺）和/或PET（Polyethylene Terephthalate，聚对苯二甲酸乙二醇酯）等有机绝缘材料制得。
柔性显示面板1形成于背板2上。其中，第一平面部11位于第一背板21上。弯曲部12与凹槽部22相对设置。第二平面部13位于第二背板23上。在一些具体实施例中，凹槽部22可以沿背板2的厚度方向贯穿背板2以裸露部分柔性显示面板1，以尽可能的提高柔性显示面板1在弯曲部12的可挠度。
当柔性显示装置100的目标厚度确定时，第一弯曲点M和第二弯曲点N之间的目标距离H也可以确定。由于弯曲部12弯曲所得的曲线段的长度与凹槽部22的长度L接近一致，弯曲部12上的最大曲率半径r由凹槽部22弯曲前的长度L决定。
本申请给出了弯曲前凹槽部22的长度L的设计公式，具体如下：
L=απ（H-h）/2
其中，α为弯曲工艺精度修正值，H为第一弯曲点M与第二弯曲点N之间的距离，h为柔性显示面板1的厚度。
在实际生产中，弯曲工艺精度修正值α满足如下公式：
α=√(A^2+B^2+C^2 ) 
其中，A为凹槽部22的制造精度，B为柔性显示面板1与背板2的贴合精度，C为第一背板21与第二背板23的弯曲对位精度。
在通过上述公式计算得到弯曲前凹槽部22的长度L后，柔性显示面板1的弯折设备可根据所得的凹槽部的长度L和第一弯曲点M与第二弯曲点N之间的目标距离H，来预设弯曲部12的弯曲轨迹，获得r值。当显示面板1按照图1弯曲，使弯曲部12上距离弯曲轴P最远的O点距离第一平面部11和第二平面部13的距离相等时，可通过常用的椭圆周长计算公式L=2r - H + πH/2 得到r值。
复合支撑结构3位于弯曲后的第一平面部11和第二平面部13之间。复合支撑结构3包括支撑层31和粘贴层32，支撑层31设置在粘贴层32上。
其中，支撑层31包括金属散热层（图中未示出）、泡棉支撑层（图中未示出）等复合结构。第一背板21位于支撑层31与第一平面部11之间。支撑层31的一侧表面与第一背板21抵接并粘贴固定。粘贴层32可采用常见的双面胶。粘贴层32将支撑层31的另一侧表面与第二背板23的表面粘贴固定。
保护层6常采用UV胶。保护层6用于保护柔性显示面板1的弯曲部12不受外力损坏。保护层6的一端延伸至第一平面部11的表面，另一端延伸至第二平面部13的表面。
在本实施例中，第一弯曲点M与第二弯曲点N之间的距离H满足如下公式:
H=2（h+a）+b
其中，h为柔性显示面板1的厚度，a为背板2的厚度，b为复合支撑结构3的厚度。
在现有技术中，弯曲部的曲率半径为定值且等于H/2。顺应业界不断降低柔性显示装置的厚度的要求，第一弯曲点M与第二弯曲点N之间的距离H在不断缩减，弯曲部的曲率半径也相应减少。但弯曲部的曲率半径越小，柔性显示面板在第一弯曲点M和第二弯曲点N这两处应力集中点所承受的弯曲应力越大。当H小于0.5mm时，柔性显示面板在第一弯曲点M与第二弯曲点N这两处应力集中点所承受的弯曲应力过大，会容易出现线路的断裂、剥离等不良，使柔性显示装置的制备良率大幅下降。本申请实施例提出在适应性减小H值的同时，通过拉长弯曲部12的最大曲率半径r使弯曲部12呈椭圆状，来减小弯曲部12在第一弯曲点M和第二弯曲点N处的弯折角度，进而降低第一弯曲点M与第二弯曲点N处的弯曲应力，从而解决上述技术问题。
在附图所示出的实施例中，第二平面部13所在平面平行于XY平面和第一平面110。第二平面部13上表面的端点N与第一平面部11上表面端点M在图示的第二平面130上下对齐，使弯曲部12的曲面顶点O点与第一平面部11之间的距离和曲面顶点O点与第二平面部13之间的距离相等。此时，弯曲部12在曲面顶点O点处的最大曲率半径r比第一弯曲点M和第二弯曲点N处的最小曲率半径H/2至少大120μm。在本申请的一些具体实施例中，弯曲部12在曲面顶点O点处的最大曲率半径r比第一弯曲点M和第二弯曲点N处的最小曲率半径H/2至少大200μm。
可以理解的是，在设计弯曲部12的弯曲轨迹时，也可以将弯曲部12的曲面顶点O设计为靠近第一平面部11或第二平面部13，以此来适应不同的应用场景或匹配不同的壳体。在这些实施例中，弯曲部12的曲面顶点O与弯曲轴P所构成的平面与XY平面的夹角范围在0度至30度之间。即弯曲部12的曲面顶点O可以朝靠近第一平面部11或靠近第二平面部13的方向偏移30度以内。
可以理解的时，柔性显示面板1还可以具有各种弯曲角度。附图作为示例仅示出第一平面部11与第二平面部13平行的柔性显示装置。在本发明的另一些实施例中，第一平面部11与第二平面部13所在平面之间的夹角可为60度或90度等，这里不作具体限定。
在第一具体实施例中，由于拉长了弯曲部12的最大曲率半径r，导致柔性显示装置100的边框宽度变宽。如图1所示，柔性显示装置100的边框宽度包括非显示区的宽度W与弯曲部12的最大曲率半径r。
为实现柔性显示装置100的窄边框化，本申请提供了如图3所示的第二实施例。第二实施例中非显示区的宽度W’小于第一实施例中非显示区的宽度W。通过降低非显示区的宽度W’，使W’与r的和小于或等于第一实施例中W与r的和，从而确保柔性显示装置100的边框宽度不变或减小，符合目前窄边框化的设计趋势。
在本实施例中，非显示区的宽度W’可通过压缩扇形区走线的面积、调整驱动控制线路的位置等方式来实现，这里不作具体限定。
本申请还提供了一种前述柔性显示装置100的制备方法，具体包括：
B1、根据如下公式获得弯折前背板2上凹槽部22的长度L：
L=απ（H-h）/2
其中，H为第一弯曲点M与第二弯曲点N之间的目标距离，h为柔性显示面板1的厚度,α为弯曲工艺精度修正值。
在实际生产中，弯曲工艺精度修正值α满足如下公式：
α=√(A^2+B^2+C^2 ) 
其中，A为凹槽部22的制造精度，B为柔性显示面板1与背板2的贴合精度，C为第一背板21与第二背板23的弯曲对位精度。
B2、柔性显示面板1的弯折设备可根据步骤B1中所得的凹槽部的长度L和第一弯曲点M与第二弯曲点N之间的目标距离H，来预设弯曲部12的弯曲轨迹。
在附图所示的实施例中，弯曲部12的弯曲轨迹包括椭圆曲面，弯曲部12的曲面顶点O与第一平面部11之间的距离和曲面顶点O与第二平面部13之间的距离相等。曲面顶点O处的曲率半径r大于H/2。
B3、弯折设备按照预设的弯曲轨迹弯曲柔性显示面板1，使弯曲部12的最大曲率半径r与H/2的差值至少大于120μm。
图4示出了本申请提供的柔性显示装置在实验室测试应力的情况。图中示出了当背板2的断差为0的理想状态时，即第一背板21与第二背板23弯曲后边缘的错位距离为0时，弯曲部12采用正半圆设计模拟得到第一弯曲点M和第二弯曲点N处的平均应力为1134MPa，弯曲部12采用非正半圆设计模拟得到第一弯曲点M和第二弯曲点N处的平均应力为1022 Mpa。利用本申请的设计能降低112Mpa应力。
由于实际生产测试调节下，第一背板21与第二背板23弯曲后边缘的对位误差无法避免。实测背板2的断差为220μm时，即第一背板21与第二背板23弯曲后边缘的错位距离为220μm时，弯曲部12采用正半圆设计实测得到第一弯曲点M和第二弯曲点N处的平均应力为2858 MPa，弯曲部12采用非正半圆设计实测得到第一弯曲点M和第二弯曲点N处的平均应力为1769M Pa。利用本申请的设计能降低1089Mpa应力。
本申请在降低柔性显示装置整体厚度时，适应性减小位于弯曲部12两端表面的第一弯曲点M与第二弯曲点N之间的距离H，并通过拉长弯曲部12的最大曲率半径r使r大于H/2，让弯曲部12的曲面包括椭圆曲面，从而降低第一弯曲点M与第二弯曲点N处的弯曲应力，避免柔性显示面板上的线路因弯曲应力过大而产生断裂、剥离等不良，显著提高超薄柔性显示面板的量产良率。
本申请所提出的技术方案打破现有技术中第一弯曲点M与第二弯曲点N之间的距离H受制于弯曲部12的曲率半径R而无法进一步减小的技术瓶颈。现有技术中H厚度值范围在0.5mm至0.7mm之间，通过本申请的改进，可将上述H值降低至0.5mm以下，在保证量产良率的同时让柔性显示装置的厚度获得进一步的压缩成为可能。
以上对本申请实施例所提供的一种柔性显示装置及其制备方法进行了详细的介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (20)

  1. 一种柔性显示装置，其中，包括：
    柔性显示面板，所述柔性显示面板在预设位置弯曲以形成第一平面部、弯曲部和第二平面部，所述弯曲部位于所述第一平面部与所述第二平面部之间；
    所述预设位置包括位于所述弯曲部与所述第一平面部的邻接处表面的第一弯曲点，以及位于所述弯曲部与所述第二平面部的邻接处表面的第二弯曲点，所述第一平面部位于第一平面上，所述第一弯曲点和所述第二弯曲点位于与所述第一平面垂直的第二平面上；
    所述第一弯曲点与所述第二弯曲点之间的距离为H，在所述第二平面上，所述弯曲部上至少有一点的曲率半径大于H/2。
  2. 根据权利要求1所述的柔性显示装置，其中，所述第二平面部平行于所述第一平面；
    在所述第二平面上，所述弯曲部的曲面顶点与所述第一平面部之间的距离和所述曲面顶点与所述第二平面部之间的距离相等。
  3. 根据权利要求2所述的柔性显示装置，其中，所述弯曲部的最大曲率半径r与所述最小曲率半径H/2的差值至少大于120μm。
  4. 根据权利要求3所述的柔性显示装置，其中，所述弯曲部的最大曲率半径r与所述最小曲率半径H/2的差值至少大于200μm。
  5. 根据权利要求2所述的柔性显示装置，其中，所述弯曲部的弯曲轴垂直于所述第二平面，所述第一弯曲点与所述第二弯曲点之间连线的中点位于所述弯曲轴上；所述曲面顶点与所述弯曲轴所构成的平面与所述第一平面部的夹角范围在0度至30度之间。
  6. 根据权利要求1所述的柔性显示装置，其中，所述弯曲部在所述第二平面上的曲面顶点与所述弯曲部的弯曲轴所构成的平面与所述第一平面部和/或所述第二平面部之间的夹角范围在0度至30度之间。
  7. 根据权利要求1所述的柔性显示装置，其中，还包括：
    背板，所述柔性显示面板设置在所述背板上，所述背板上对应所述第一平面部设置有第一背板，所述第一平面部位于所述第一背板上；所述背板上对应所述弯曲部设置有凹槽部，所述弯曲部与所述凹槽部相对设置；所述背板上对应所述第二平面部设置有第二背板，所述第二平面部位于所述第二背板上；
    所述第二平面部被弯折至所述第一背板上远离所述第一平面部的一侧，弯折前的所述凹槽部的长度L的设计值满足如下公式：
    L=απ（H-h）/2
    其中，α为弯曲工艺精度修正值，H为所述第一弯曲点与所述第二弯曲点之间的距离，h为所述柔性显示面板的厚度。
  8. 根据权利要求7所述的柔性显示装置，其中，所述弯曲工艺精度修正值α满足如下公式：
    α=√(A^2+B^2+C^2 ) 
    其中，A为所述凹槽部的制造精度，B为所述柔性显示面板与所述背板的贴合精度，C为所述第一背板与所述第二背板的弯曲对位精度。
  9. 根据权利要求7所述的柔性显示装置，其中，还包括复合支撑结构，所述复合支撑结构位于弯曲后的所述第一平面部和所述第二平面部之间，所述复合支撑结构分别与所述第一背板和所述第二背板抵接，所述第一弯曲点与所述第二弯曲点之间的距离H满足如下公式:
    H=2（h+a）+b
    其中，h为所述柔性显示面板的厚度，a为所述背板的厚度，b为所述复合支撑结构的厚度。
  10. 根据权利要求1所述的柔性显示装置，其中，所述弯曲部包括椭圆曲面。
  11. 根据权利要求1所述的柔性显示装置，其中，在所述第二平面上，所述弯曲部具有曲面顶点，所述弯曲部的曲率半径在所述第一弯曲点至所述曲面顶点的区域内逐渐增大，所述弯曲部的曲率半径在所述曲面顶点至所述第二弯曲点的区域内逐渐减小。
  12. 根据权利要求1所述的柔性显示装置，其中，在所述第二平面上，所述弯曲部的曲率半径在最小曲率半径H/2与最大曲率半径r之间变化。
  13. 一种如权利要求1所述的柔性显示装置的制备方法，其中，包括：
    B1、根据如下公式获得弯折前背板上开设的与所述弯曲部对应的凹槽部的长度L：
    L=απ（H-h）/2
    其中，α为弯曲工艺精度修正值，H为所述第一弯曲点与所述第二弯曲点之间的目标距离，h为所述柔性显示面板的厚度；
    B2、所述柔性显示面板的弯折设备根据所述凹槽部的长度L和所述第一弯曲点与所述第二弯曲点之间的目标距离H，预设所述弯曲部的弯曲轨迹，使所述弯曲部在所述第二平面上的曲面顶点与所述第一平面部之间的距离和所述曲面顶点与所述第二平面部之间的距离相等；
    B3、所述弯折设备按照预设的所述弯曲轨迹弯曲所述柔性显示面板，使所述弯曲部的最大曲率半径r与所述H/2的差值至少大于120μm。
  14. 根据权利要求13所述的柔性显示装置的制备方法，其中，所述步骤B2还包括：
    预设所述弯曲部的弯曲轨迹，使所述弯曲部的弯曲轴垂直于所述第二平面，所述第一弯曲点与所述第二弯曲点之间连线的中点位于所述弯曲轴上；弯曲后的所述弯曲部的所述曲面顶点与所述弯曲轴所构成的平面与所述第一平面部的夹角范围在0度至30度之间。
  15. 根据权利要求13所述的柔性显示装置的制备方法，其中，所述弯曲工艺精度修正值α满足如下公式：
    α=√(A^2+B^2+C^2 ) 
    其中，A为所述凹槽部的制造精度，B为所述柔性显示面板与所述背板的贴合精度，C为所述第一背板与所述第二背板的弯曲对位精度。
  16. 根据权利要求13所述的柔性显示装置的制备方法，其中，所述柔性显示装置还包括复合支撑结构，所述步骤B3包括：
    所述第一平面部位于所述复合支撑结构的一侧，将所述第二平面部弯曲至所述复合支撑结构的另一侧，使所述复合支撑结构分别与所述第一背板和所述第二背板抵接，所述第一弯曲点与所述第二弯曲点之间的距离H满足如下公式:
    H=2（h+a）+b
    其中，h为所述柔性显示面板的厚度，a为所述背板的厚度，b为所述复合支撑结构的厚度。
  17. 根据权利要求13所述的柔性显示装置的制备方法，其中，所述弯曲部的弯曲轨迹包括椭圆曲面。
  18. 根据权利要求13所述的柔性显示装置的制备方法，其中，在所述步骤B2中，预设所述弯曲部的弯曲轨迹，使所述弯曲部的曲率半径在所述第一弯曲点至所述曲面顶点的区域内逐渐增大，所述弯曲部的曲率半径在所述曲面顶点至所述第二弯曲点的区域内逐渐减小。
  19. 根据权利要求13所述的柔性显示装置的制备方法，其中，在所述步骤B2中，预设所述弯曲部的弯曲轨迹，使在所述第二平面上，所述弯曲部的曲率半径在最小曲率半径H/2与最大曲率半径r之间变化。
  20. 根据权利要求13所述的柔性显示装置的制备方法，其中，所述步骤B3包括：所述弯折设备按照预设的所述弯曲轨迹弯曲所述柔性显示面板，使所述弯曲部的最大曲率半径r与所述H/2的差值至少大于200μm。
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