WO2021036164A1 - 显示面板及其制作方法 - Google Patents

显示面板及其制作方法 Download PDF

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Publication number
WO2021036164A1
WO2021036164A1 PCT/CN2020/070871 CN2020070871W WO2021036164A1 WO 2021036164 A1 WO2021036164 A1 WO 2021036164A1 CN 2020070871 W CN2020070871 W CN 2020070871W WO 2021036164 A1 WO2021036164 A1 WO 2021036164A1
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WO
WIPO (PCT)
Prior art keywords
flexible substrate
layer
area
bending
flexible
Prior art date
Application number
PCT/CN2020/070871
Other languages
English (en)
French (fr)
Inventor
胡凯
Original Assignee
武汉华星光电半导体显示技术有限公司
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.)
Filing date
Publication date
Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/638,478 priority Critical patent/US11309500B2/en
Publication of WO2021036164A1 publication Critical patent/WO2021036164A1/zh

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Classifications

    • 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
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • 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
    • 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
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This application relates to the technical field of display panels, and in particular to a display panel and a manufacturing method thereof.
  • AMOLED Active-matrix organic light emitting diode
  • the present application provides a display panel and a manufacturing method thereof.
  • the bending stress of the flexible substrate in the bending area is reduced when the flexible substrate is bent.
  • the flexible substrate in the zone is bent, it is prone to technical problems that the flexible substrate is broken or peeled off.
  • the present application provides a display panel including a flexible substrate, the flexible substrate including a bending area and a non-bending area, the thickness of the flexible substrate located in the bending area is greater than the thickness of the flexible substrate located in the non-bending area small.
  • a first groove is provided on a surface of one side of the flexible substrate, and the first groove is provided corresponding to the bending area.
  • a second groove is provided on a surface of the flexible substrate on a side away from the first groove, and the second groove is provided corresponding to the bending area.
  • a surface of the flexible substrate on a side away from the first groove is provided with a plurality of third grooves, and the plurality of third grooves correspond to the bending area Set up.
  • a plurality of fourth grooves are provided at the bottom of the first groove.
  • the flexible substrate includes a first flexible layer, and an intermediate layer and a second flexible layer sequentially disposed on the first flexible layer;
  • the first groove is provided on the surface of the first flexible layer away from the intermediate layer
  • the second groove is provided on the surface of the second flexible layer away from the intermediate layer
  • the bottom of the first groove is provided with a plurality of fourth grooves
  • the bottom of the second groove is provided with a plurality of fifth grooves.
  • the non-bending area includes a first area and a second area, and the first area and the second area are connected by the bending area; the display panel further includes The TFT array layer, the organic light-emitting layer, and the encapsulation layer are sequentially arranged on the flexible substrate in the first area, the metal layer is arranged on the flexible substrate in the bending area, and the metal layer is arranged in the second area.
  • the driving circuit on the flexible substrate; the metal layer extends from the TFT array layer to the driving circuit.
  • the flexible substrate located in the bending area is bent at 180° in a direction away from the TFT array layer; the display panel further includes a support layer, and the support layer is located at the The flexible substrate is on a side away from the TFT array layer; and the flexible substrate located in the first area and the flexible substrate located in the second area are connected and fixed by the support layer.
  • the first area includes a display area and a first transition area
  • the second area includes a second transition area and a third area
  • the display area and the bending area The zone is connected by the first transition zone, and the third zone and the bending zone are connected by the second transition zone; the first transition zone corresponds to the second transition zone, and the third zone Corresponding to the display area; the TFT array layer, the organic light-emitting layer and the support layer are arranged corresponding to the display area.
  • the embodiment of the present application also provides a display panel, including a flexible substrate, the flexible substrate including a first flexible layer, and an intermediate layer and a second flexible layer sequentially disposed on the first flexible layer;
  • the flexible substrate includes a bending area and a non-bending area, and the thickness of the flexible substrate located in the bending area is smaller than the thickness of the flexible substrate located in the non-bending area.
  • the embodiment of the present application also provides a manufacturing method of a display panel, which includes the following steps:
  • the flexible substrate includes a bending area and a non-bending area;
  • the flexible substrate in the bending zone is thinned, so that the thickness of the flexible substrate in the bending zone is smaller than the thickness of the flexible substrate in the non-bending zone.
  • the thinning process of the flexible substrate in the bending area includes the following steps:
  • the surface of the flexible substrate in the non-bending area is covered with a photoresist layer, so that the flexible substrate in the bending area is exposed;
  • the photoresist layer covering the flexible substrate is removed.
  • the flexible substrate includes a first flexible layer, and an intermediate layer and a second flexible layer sequentially disposed on the first flexible layer;
  • the thinning of the flexible substrate in the bending zone includes the following steps:
  • the surface of the first flexible layer and the second flexible layer on the side away from the intermediate layer in the non-bending area is covered with a photoresist layer, so that the first flexible layer and the second flexible layer in the bending area Layer exposed
  • the photoresist layer covering the flexible substrate is removed.
  • the present application reduces the bending stress of the flexible substrate in the bending zone by reducing the thickness of the flexible substrate in the bending zone, and avoids the flexible substrate in the bending zone from breaking or breaking during the bending process. It is peeled off from other adjacent structures, thereby ensuring the overall performance of the display panel;
  • the flexible substrate is composed of a first flexible layer, an intermediate layer and a second flexible layer sequentially arranged on the first flexible layer, and the first flexible layer is thinned.
  • the thickness of the second flexible layer to achieve that the thickness of the flexible substrate in the bending zone is smaller than the thickness of the flexible substrate in the non-bending zone, which can reduce the impact of each layer structure in the bending zone during the bending process.
  • the bending stress prevents the first flexible layer, the second flexible layer and the intermediate layer from breaking or peeling off in the bending area, ensuring the structural integrity and functional integrity of the flexible substrate, and effectively improving the display effect of the display panel.
  • FIG. 1 is a schematic structural diagram of a display panel provided by an embodiment of the application.
  • FIG. 2 is a top view of a flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 3 is a cross-sectional view of a flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 4 is a cross-sectional view of another flexible substrate provided in an embodiment of the application in an unbent state
  • FIG. 5 is a cross-sectional view of another flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 6 is a cross-sectional view of another flexible substrate provided in an embodiment of the application in an unbent state
  • FIG. 7 is a cross-sectional view of another flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 8 is a cross-sectional view of another flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 9 is a cross-sectional view of another flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 10 is a cross-sectional view of another flexible substrate provided in an embodiment of the application in an unbent state
  • FIG. 11 is a cross-sectional view of another flexible substrate provided in an embodiment of the application in an unbent state
  • FIG. 12 is a schematic structural diagram of another display panel provided by an embodiment of the application.
  • FIG. 13 is a cross-sectional view of another flexible substrate provided by an embodiment of the application in an unbent state
  • FIG. 14 is a schematic block diagram of a manufacturing method of a display panel according to an embodiment of the application.
  • 15 is a schematic flowchart of a manufacturing method of a display panel provided by an embodiment of the application.
  • FIG. 16 is a schematic flowchart of another method for manufacturing a display panel according to an embodiment of the application.
  • connection should be understood in a broad sense, unless otherwise clearly specified and limited.
  • it can be a fixed connection or a detachable connection.
  • Connected or integrally connected it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection should be understood in a broad sense, unless otherwise clearly specified and limited.
  • it can be a fixed connection or a detachable connection.
  • Connected or integrally connected it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.
  • an embodiment of the present application discloses a display panel 1, including a flexible substrate 2.
  • the flexible substrate 2 includes a bending area 3 and a non-bending area 4, and the flexible substrate 2 is located in the bending area 3.
  • the thickness (d) of is smaller than the thickness (D) of the flexible substrate 2 located in the non-bending area 4.
  • the display panel 1 further includes a TFT (Thin Film Transistor) array layer 5, an organic light-emitting layer 6, an encapsulation layer 7 and a driving circuit 8 arranged on the flexible substrate 2 located in the non-bending area 4;
  • the non-bending area 4 includes a first area 9 and a second area 10.
  • the first area 9 and the second area 10 are connected by the bending area 3; the TFT array layer 5, the organic light emitting layer 6, and the encapsulation layer 7 correspond to the first area 9
  • the drive circuit 8 is arranged on the flexible substrate 2 located in the second area 10; the flexible substrate 2 located in the bending area 3 is provided with a secondary TFT array layer 5
  • the metal layer 11 extending to the driving circuit 8, the TFT array layer 5 and the driving circuit 8 are electrically connected through the metal layer 11.
  • the thickness of the flexible substrate 2 in the bending zone 3 is reduced to reduce the bending stress of the flexible substrate 2 in the bending zone 3 during bending, so as to avoid bending
  • the flexible substrate 2 in the area 3 is broken or peeled off from other adjacent structures during the bending process, thereby ensuring the overall performance of the display panel 1;
  • the display panel 1 also includes a bending area, and the bending of the flexible substrate 2 The bending area 3 overlaps, reducing the thickness of the flexible substrate 2 in the bending area 3 reduces the thickness of the overall structure in the bending area of the display panel 1, and by reducing the metal layer 11 in the bending area of the display panel 1.
  • the thickness of the buffer layer to reduce the thickness of the overall structure in the bending area of the display panel 1 so that the stress on the various layer structures in the bending area of the display panel 1 is reduced.
  • the overall thickness of the bending area of the display panel 1 is significantly reduced, so that the bending stress of each layer structure located in the bending area is reduced, and avoiding The flexible substrate 2 and other structural layers located in the bending area 3 are broken or peeled off, thereby improving the display effect of the display panel 1.
  • the surface of one side of the flexible substrate 2 is provided with a first groove 12, and the first groove 12 is provided corresponding to the bending area 3.
  • the orthographic projection of the first groove 12 on the flexible substrate 2 and the orthographic projection of the bending zone 3 on the flexible substrate 2 coincide.
  • the first groove 12 may be provided on the upper surface of the flexible substrate 2 or on the lower surface of the flexible substrate 2.
  • the depth of the first groove 12 may be the same everywhere, or it may be variable.
  • the bending area 3 includes a bending line 13, and the depth of the first groove 12 extends from the bending line 13 to perpendicular to the bending line 13 and away from it.
  • the bending line 13 gradually becomes smaller in the direction, where the bending line 13 may refer to the center line position where the curvature radius of the bending zone 3 is the smallest after being bent.
  • the first groove 12 is provided on the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than the thickness of the flexible substrate 2 in the non-bending zone 4.
  • the flexible substrate 2 in the bending zone 3 has the smallest thickness at the bending line 13, due to the bending line
  • the radius of curvature after being bent at 13 is the smallest, the bending stress is the largest, and the most likely to be broken. Reducing the thickness of the flexible substrate 2 at the bending line 13 can effectively reduce the impact on the flexible substrate 2 at the bending line 13 The bending stress prevents the flexible substrate 2 from breaking.
  • the flexible substrate 2 located in the bending area 3 is bent at 180° in a direction away from the TFT array layer 5; the display panel 1 further includes a support layer 14, which is located on the flexible substrate 2.
  • the side away from the TFT array layer 5; the flexible substrate 2 located in the first area 9 and the flexible substrate 2 located in the second area 10 are connected and fixed by the support layer 14 (including the backplane 15 and the adhesive layer 16);
  • the first area 9 Including a display area 17 and a first transition area 18, the second area 10 includes a second transition area 20 and a third area 19, the display area 17 and the bending area 3 are connected by the first transition area 18, the third area 19 and the bending area
  • the area 3 is connected by the second transition area 20, the first transition area 18 corresponds to the second transition area 20, and the third area 19 corresponds to the display area 17;
  • the TFT array layer 5, the organic light emitting layer 6, and the support layer 14 correspond to the display area 17 Set up.
  • the first transition area 18, the second transition area 20, and the bending area 3 all belong to the non-display area.
  • the support layer 14 is provided only corresponding to the display area 17, so that after the bending area 3 is bent at 180°, the flexible substrate 2 and the support located in the first transition area 18, the bending area 3, and the second transition area 20
  • a gap is formed between the layers 14, so that the flexible substrate 2 located in the first transition zone 18, the bending zone 3 and the second transition zone 20 is not compressed by the support layer 14, so that the flexible substrate 2 located in the first transition zone 18, the bending zone 3 and the flexible substrate 2 in the second transition zone 20 are balanced in bending stress, avoiding the phenomenon that the flexible substrate 2 cannot be completely bent or the flexible substrate 2 breaks after bending due to uneven stress during the bending process.
  • the embodiment of the present application also discloses a display panel 1.
  • a first groove 12 is provided on the surface of one side of the flexible substrate 2, and the flexible substrate 2 is away from the first groove.
  • the surface on one side 12 is provided with a second groove 21, and the first groove 12 and the second groove 21 are arranged corresponding to the bending area 3.
  • the orthographic projections of the first groove 12 and the second groove 21 on the flexible substrate 2 are the same as the orthographic projections of the bending area 3 on the flexible substrate 2.
  • the projections overlap, and the depths of the first groove 12 and the second groove 21 are the same.
  • the depths of the first groove 12 and the second groove 21 can also be different.
  • the depth of 21 is not limited.
  • the first groove 12 and the second groove 21 are respectively provided on both sides of the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than that of the non-bending zone.
  • the thickness of the flexible substrate 2 in 4, and the minimum radius of curvature of the flexible substrate 2 in the bending zone 3 is increased after bending, and the bending stress on the flexible substrate 2 at the minimum radius of curvature is reduced, thereby protecting The most easily broken part of the flexible substrate 2 in the bending zone 3.
  • the embodiment of the present application also discloses a display panel 1.
  • a first groove 12 is provided on the surface of one side of the flexible substrate 2, and the flexible substrate 2 is away from the first groove.
  • the surface on one side 12 is provided with a plurality of third grooves 22, and the first groove 12 and the plurality of third grooves 22 are arranged corresponding to the bending area 3.
  • the orthographic projection of the first groove 12 on the flexible substrate 2 coincides with the orthographic projection of the bending zone 3 on the flexible substrate 2, and the third groove
  • the number of 22 can be odd or even, and the plurality of third grooves 22 are evenly distributed in the bending area 3.
  • the first groove 12 is provided on the surface of the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than that of the flexible substrate 2 in the non-bending zone 4.
  • a plurality of third grooves 22 corresponding to the bending area 3 are provided on the surface of the flexible substrate 2 on the side away from the first groove 12, and a plurality of uniformly distributed third grooves 22 can disperse the flexible substrate 2
  • the bending stress received on the side away from the first groove 12 further reduces the bending stress experienced by the flexible substrate 2 in the bending zone 3 when it is bent.
  • the embodiment of the present application also discloses a display panel 1.
  • a first groove 12 is provided on the surface of one side of the flexible substrate 2, and the first groove 12 is correspondingly bent.
  • the zone 3 is provided, and the bottom of the first groove 12 is provided with a plurality of fourth grooves 23.
  • the number of the fourth grooves 23 may be odd or even, and a plurality of fourth grooves 23 are evenly distributed on the bottom of the first groove 12.
  • the first groove 12 is provided on the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than the thickness of the flexible substrate 2 in the non-bending zone 4.
  • a plurality of fourth grooves 23 are provided at the bottom of the first groove 12, and the plurality of evenly distributed fourth grooves 23 can disperse the bending stress of the flexible substrate 2 where the first groove 12 is located, and also This further reduces the bending stress experienced by the flexible substrate 2 in the bending zone 3 when it is bent.
  • the embodiment of the present application also discloses a display panel 1.
  • a first groove 12 is provided on the surface of one side of the flexible substrate 2, and the flexible substrate 2 is away from the first groove.
  • the surface on one side 12 is provided with a second groove 21, the first groove 12 and the second groove 21 are arranged corresponding to the bending area 3, and the bottom of the first groove 12 is provided with a plurality of fourth grooves 23.
  • the number of the fourth grooves 23 may be odd or even, and a plurality of fourth grooves 23 are evenly distributed on the bottom of the first groove 12.
  • the first groove 12 and the second groove 21 are respectively provided on both sides of the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than that of the non-bending zone.
  • the thickness of the flexible substrate 2 in 4 and at the same time, a plurality of fourth grooves 23 are provided at the bottom of the first groove 12, and a plurality of evenly distributed fourth grooves 23 can further disperse the position where the first groove 12 is located.
  • the bending stress experienced by the flexible substrate 2 also further reduces the bending stress experienced by the flexible substrate 2 in the bending zone 3 during bending.
  • the embodiment of the present application also discloses a display panel 1.
  • a first groove 12 is provided on the surface of one side of the flexible substrate 2, and the flexible substrate 2 is away from the first groove.
  • a second groove 21 is provided on the surface on one side of 12, the first groove 12 and the second groove 21 are arranged corresponding to the bending area 3, and the bottom of the first groove 12 is provided with a plurality of fourth grooves 23.
  • the bottom of the second groove 21 is provided with a plurality of fifth grooves 24.
  • the number of the fourth grooves 23 and the fifth grooves 24 may be odd or even, and a plurality of fourth grooves 23 are evenly distributed on the bottom of the first groove 12, and a plurality of fifth grooves 24 are evenly distributed at the bottom of the second groove 21.
  • the first groove 12 and the second groove 21 are respectively provided on both sides of the flexible substrate 2 in the bending zone 3 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than that of the non-bending zone.
  • the thickness of the flexible substrate 2 in 4 at the same time, a plurality of fourth grooves 23 are provided at the bottom of the first groove 12, and a plurality of fifth grooves 24 are provided at the bottom of the second groove 21.
  • the distributed fourth grooves 23 and a plurality of evenly distributed fifth grooves 24 respectively disperse the bending stress received by the flexible substrate 2 from both sides of the flexible substrate 2 in the bending zone 3, and further reduce the bending The bending stress experienced by the flexible substrate 2 in the zone 3 when it is bent.
  • the embodiment of the present application also discloses a display panel 1.
  • the flexible substrate 2 includes a first flexible layer 25, and is sequentially arranged on the first flexible layer 25
  • the first groove 12 is arranged on the surface of the first flexible layer 25 away from the intermediate layer 26, and
  • the second groove 21 is arranged on the second flexible layer 27 away from the intermediate layer 26.
  • the material of the first flexible layer 25 includes polyimide
  • the material of the second flexible layer 27 and the first flexible layer 25 are the same
  • the material of the intermediate layer 26 includes silicon oxide, silicon nitride, silicon oxide, and silicon nitride.
  • the intermediate layer 26 can play a role of blocking water and oxygen on the one hand, and can play a role of heat preservation on the other hand, and protect the flexible substrate 2 from high temperature process damage.
  • the depths of the first groove 12 and the second groove 21 are the same.
  • the depths of the first groove 12 and the second groove 21 can also be different.
  • the thickness is not limited.
  • the flexible substrate 2 is composed of a first flexible layer 25, an intermediate layer 26 and a second flexible layer 27 that are sequentially disposed on the first flexible layer 25, and a first groove 12 is provided on the first flexible layer 25.
  • the second groove 21 is provided on the second flexible layer 27 to realize that the thickness of the flexible substrate 2 in the bending zone 3 is smaller than the thickness of the flexible substrate 2 in the non-bending zone 4, by reducing the thickness of the flexible substrate 2 in the bending zone 3.
  • the thickness of the flexible substrate 2 can reduce the bending stress of each layer structure in the bending zone 3 during the bending process, and avoid the first flexible layer 25, the second flexible layer 27 and the middle in the bending zone 3.
  • the layer 26 is broken or the first flexible layer 25 and the second flexible layer 27 are separated from the intermediate layer 26 respectively, which ensures the structural integrity and functional integrity of the flexible substrate 2 and effectively improves the display effect of the display panel 1.
  • the intermediate layer 26 is located on the neutral surface, and the flexible substrate 2 in the bending zone 3 is bent during the bending process.
  • the bending stress is the smallest, which effectively protects the intermediate layer 26 from damage, and the first groove 12 and the second groove 21 also make the first flexible layer 25 and the second flexible layer on both sides of the neutral surface in the bending zone 3
  • the bending stress received by the layer 27 is reduced, so that the first flexible layer 25, the second flexible layer 27, and the intermediate layer 26 in the bending zone 3 are prevented from breaking or peeling off.
  • the embodiment of the present application also discloses a display panel 1.
  • the flexible substrate 2 includes a first flexible layer 25 and an intermediate layer sequentially disposed on the first flexible layer 25 26 and the second flexible layer 27; the first groove 12 is arranged on the surface of the first flexible layer 25 away from the intermediate layer 26, and the surface of the second flexible layer 27 away from the intermediate layer 26 is provided with a plurality of third grooves
  • the groove 22 and the plurality of third grooves 22 are arranged corresponding to the bending area 3.
  • the number of the third grooves 22 may be odd or even, and the plurality of third grooves 22 are evenly distributed in the bending area 3.
  • the thickness of the flexible substrate 2 in the bending zone 3 is smaller than the thickness of the flexible substrate 2 in the non-bending zone 4 by arranging the first groove 12 on the first flexible layer 25.
  • the thickness of the flexible substrate 2 in the bending zone 3 can reduce the bending stress of each layer structure in the bending zone 3 during the bending process, and a plurality of evenly distributed third layers are arranged on the second flexible layer 27.
  • the groove 22 further reduces the bending stress of each layer structure in the bending zone 3 during the bending process, and avoids the first flexible layer 25, the second flexible layer 27 and the intermediate layer in the bending zone 3 26 is broken or peeled off, ensuring the structural integrity and functional integrity of the flexible substrate 2 and effectively improving the display effect of the display panel 1.
  • the bottom of the first groove 12 may also be provided with a plurality of fourth grooves 23, and the bottom of the second groove 21 may also be provided with a plurality of fifth grooves 24, which will not be repeated here.
  • the cross-sectional shapes of the first groove 12, the second groove 21, the third groove 22, the fourth groove 23, and the fifth groove 24 in the direction perpendicular to the flexible substrate 2 include rectangles and arcs.
  • an embodiment of the present application also provides a manufacturing method of the display panel 1, including the following steps:
  • S141 Provide a flexible substrate; the flexible substrate includes a bending area and a non-bending area;
  • S142 Perform a thinning process on the flexible substrate in the bending area, so that the thickness of the flexible substrate in the bending area is smaller than the thickness of the flexible substrate in the non-bending area.
  • step S142 includes the following steps:
  • the surface of the flexible substrate 2 in the non-bending area 4 (shown as a in FIG. 15) is covered with a photoresist layer 28, so that the flexible substrate 2 in the bending area 3 is exposed, such as Shown in b in Figure 15;
  • the exposed flexible substrate 2 is etched with an etching solution to make the thickness of the flexible substrate 2 in the bending area 3 thinner, as shown in c in FIG. 15;
  • the photoresist layer 28 covering the flexible substrate 2 is removed, as shown in d in FIG. 15.
  • the thickness of the thinning can be controlled from the nanometer level to the micrometer level according to different treatment processes.
  • a TFT array layer 5 After thinning the flexible substrate 2 in the bending area 3, a TFT array layer 5, an organic light-emitting layer 6, an encapsulation layer 7, a driving circuit 8 and a support layer 14 will be formed on the flexible substrate 2, and bend The folding area 3 is bent, and the specific steps are not described in detail here.
  • the display panel 1 also includes a bending area 3, which overlaps with the bending area 3 of the flexible substrate 2 to reduce the bending area 3.
  • the thickness of the flexible substrate 2 in the display panel 1 reduces the thickness of the overall structure in the bending area 3 of the display panel 1, and reduces the display panel by reducing the thickness of the metal layer 11 or the buffer layer in the bending area 3 of the display panel 1.
  • the present application can prevent damage to the effective display area 17 of the display panel 1.
  • the overall thickness of the bending area 3 of the display panel 1 is significantly reduced, thereby reducing the bending stress of each layer structure located in the bending area 3, and avoiding the flexible substrate 2 located in the bending area 3 and others.
  • the structural layer is broken or peeled off, thereby improving the display effect of the display panel 1.
  • the flexible substrate 2 (as shown in e in FIG. 16) includes a first flexible layer 25, and an intermediate layer 26 and a second flexible layer that are sequentially disposed on the first flexible layer 25.
  • Layer 27; Step S142 includes the following steps:
  • the surface of the first flexible layer 25 and the second flexible layer 27 in the non-bending zone 4 away from the intermediate layer 26 is covered with the photoresist layer 28, so that the first flexible layer 25 and the second flexible layer 27 in the bending zone 3
  • the flexible layer 27 is exposed, as shown in f in FIG. 16;
  • the exposed first flexible layer 25 and the second flexible layer 27 are etched with an etching solution, so that the thickness of the first flexible layer 25 and the second flexible layer 27 in the bending area 3 becomes thinner, as shown in g in FIG. 16 Shown
  • the photoresist layer 28 covering the flexible substrate 2 is removed, as shown by h in FIG. 16.
  • the flexible substrate 2 is composed of a first flexible layer 25 and an intermediate layer 26 and a second flexible layer 27 that are sequentially arranged on the first flexible layer 25.
  • the first flexible layer 25 and the second flexible layer 27 are thinned.
  • the thickness of the flexible substrate 2 in the bending zone 3 is smaller than the thickness of the flexible substrate 2 in the non-bending zone 4, which can reduce the impact of each layer structure in the bending zone 3 during the bending process.
  • the bending stress prevents the first flexible layer 25, the second flexible layer 27 and the intermediate layer 26 from breaking or peeling off in the bending zone 3, ensuring the structural integrity and functional integrity of the flexible substrate 2 and effectively improving the display The display effect of panel 1.

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Abstract

一种显示面板(1)及其制作方法，显示面板(1)包括柔性基板(2)，柔性基板(2)包括弯折区(3)和非弯折区(4)，位于弯折区(3)的柔性基板(2)的厚度(d)较位于非弯折区(4)的柔性基板(2)的厚度(D)小。

Description

显示面板及其制作方法
本申请要求于2019年08月23日提交中国专利局、申请号为201910783550.8、发明名称为“一种显示面板及其制作方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示面板技术领域，特别涉及一种显示面板及其制作方法。
 背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
随着柔性和可折叠式智能手机需求量的增加，以及平板电脑和可穿戴电子设备等搭载可折叠显示器的发展，刺激了柔性可折叠显示面板大幅发展。对于一些高端显示面板，消费者倾向于柔性可折叠和窄边框的设计。目前为实现可折叠和窄边框设计，大部分厂商都使用以柔性基板为基材的AMOLED（Active-matrix organic light emitting diode，有源矩阵有机发光二极管）技术。柔性基板具有较好的柔性，因此具备了可折叠的前提，另外，通过对显示面板边框处COF（Chip on film，覆晶薄膜）的绑定垫片或COP（Chip on panel）的控制芯片绑定垫片以及一些金属走线和电路的下弯折可以将原有刚性的显示面板边框变小，从而实现显示面板的可折叠和窄边框设计。
然而，采用柔性基板为基材并结合下弯折技术实现可折叠和窄边框设计时仍有一些未能解决的问题，例如柔性基板的断裂或剥离，严重影响显示面板的显示效果，这种现象在弯折区尤为明显。
 技术问题
本申请提供一种显示面板及其制作方法，通过减小弯折区中的柔性基板的厚度来减小弯折区中的柔性基板在弯折时所受的弯折应力，解决了位于弯折区的柔性基板呈弯折状时易出现柔性基板断裂或剥离的技术问题。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请提供一种显示面板，包括柔性基板，所述柔性基板包括弯折区和非弯折区，位于所述弯折区的柔性基板的厚度较位于所述非弯折区的柔性基板的厚度小。
在本申请实施例所提供的显示面板中，所述柔性基板一侧的表面设有第一凹槽，所述第一凹槽对应所述弯折区设置。
在本申请实施例所提供的显示面板中，所述柔性基板远离所述第一凹槽一侧的表面设有第二凹槽，所述第二凹槽对应所述弯折区设置。
在本申请实施例所提供的显示面板中，所述柔性基板远离所述第一凹槽一侧的表面设有多个第三凹槽，所述多个第三凹槽对应所述弯折区设置。
在本申请实施例所提供的显示面板中，所述第一凹槽的底部设有多个第四凹槽。
在本申请实施例所提供的显示面板中，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
所述第一凹槽设置在所述第一柔性层远离所述中间层一侧的表面上，所述第二凹槽设置在所述第二柔性层远离所述中间层一侧的表面上。
在本申请实施例所提供的显示面板中，所述第一凹槽的底部设有多个第四凹槽，所述第二凹槽的底部设有多个第五凹槽。
在本申请实施例所提供的显示面板中，所述非弯折区包括第一区域和第二区域，所述第一区域和第二区域通过所述弯折区连接；所述显示面板还包括依次设置在位于所述第一区域的柔性基板上的TFT阵列层、有机发光层、封装层，设置在位于所述弯折区的柔性基板上的金属层，以及设置在位于所述第二区域的柔性基板上的驱动电路；所述金属层从所述TFT阵列层延伸至所述驱动电路。
在本申请实施例所提供的显示面板中，位于所述弯折区的柔性基板向背离所述TFT阵列层的方向呈180°弯曲；所述显示面板还包括支撑层，所述支撑层位于所述柔性基板背离所述TFT阵列层的一侧；且位于所述第一区域的柔性基板和位于所述第二区域的柔性基板通过所述支撑层连接固定。
在本申请实施例所提供的显示面板中，所述第一区域包括显示区和第一过渡区，所述第二区域包括第二过渡区和第三区域；所述显示区和所述弯折区通过所述第一过渡区连接，所述第三区域和所述弯折区通过所述第二过渡区连接；所述第一过渡区和所述第二过渡区对应，所述第三区域和所述显示区对应；所述TFT阵列层、所述有机发光层和所述支撑层对应所述显示区设置。
本申请实施例还提供了一种显示面板，包括柔性基板，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
所述柔性基板包括弯折区和非弯折区，位于所述弯折区的柔性基板的厚度较位于所述非弯折区的柔性基板的厚度小。
本申请实施例还提供了一种显示面板的制作方法，包括以下步骤：
提供柔性基板；所述柔性基板包括弯折区和非弯折区；
对所述弯折区中的柔性基板进行减薄处理，以使所述弯折区中的柔性基板的厚度较所述非弯折区中的柔性基板的厚度小。
在本申请实施例所提供的显示面板的制作方法中，所述对所述弯折区中的柔性基板进行减薄处理，包括以下步骤：
在所述非弯折区中的柔性基板的表面覆盖光阻层，以使所述弯折区中的柔性基板裸露出来；
采用蚀刻液对裸露的柔性基板进行蚀刻，以使所述弯折区中的柔性基板的厚度变薄；
去除覆盖在所述柔性基板上的光阻层。
在本申请实施例所提供的显示面板的制作方法中，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
所述对所述弯折区中的柔性基板进行减薄处理，包括以下步骤：
在所述非弯折区中的第一柔性层和第二柔性层远离所述中间层的一侧的表面覆盖光阻层，以使所述弯折区中的第一柔性层和第二柔性层裸露出来；
采用蚀刻液对裸露的第一柔性层和第二柔性层进行蚀刻，以使所述弯折区中的第一柔性层和第二柔性层的厚度变薄；
去除覆盖在所述柔性基板上的光阻层。
 有益效果
本申请通过减小弯折区中的柔性基板的厚度来减小弯折区中的柔性基板在弯折时所受的弯折应力，避免弯折区中的柔性基板在弯折过程中断裂或与相邻的其他结构剥离，从而保证了显示面板的整体性能；柔性基板由第一柔性层以及依次设置在第一柔性层上的中间层和第二柔性层构成，通过减薄第一柔性层和第二柔性层的厚度来实现弯折区中的柔性基板的厚度小于非弯折区中的柔性基板的厚度，可以减小弯折区中的每一层结构在弯折过程中所受到的弯折应力，避免弯折区中的第一柔性层、第二柔性层和中间层断裂或剥离，保证了柔性基板结构的完整性以及功能的完整性，有效的提高了显示面板的显示效果。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是申请的一些实施例，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为本申请实施例提供的一种显示面板的结构示意图；
图2为本申请实施例提供的一种柔性基板未弯折状态下的俯视图；
图3为本申请实施例提供的一种柔性基板未弯折状态下的截面图；
图4为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图5为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图6为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图7为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图8为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图9为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图10为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图11为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图12为本申请实施例提供的另一种显示面板的结构示意图；
图13为本申请实施例提供的另一种柔性基板未弯折状态下的截面图；
图14为本申请实施例提供的一种显示面板的制作方法的流程示意框图；
图15为本申请实施例提供的一种显示面板的制作方法的流程示意图；
图16为本申请实施例提供的另一种显示面板的制作方法的流程示意图。
 本发明的实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是用来描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，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申请的限制。此外，术语“第一”、“第二”仅用来描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，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，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是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申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
下面结合附图和实施例对本申请作进一步说明。
如图1至图3所示，本申请实施例公开了一种显示面板1，包括柔性基板2，柔性基板2包括弯折区3和非弯折区4，位于弯折区3的柔性基板2的厚度(d)较位于非弯折区4的柔性基板2的厚度(D)小。
具体的，显示面板1还包括设置在位于非弯折区4的柔性基板2上的TFT（Thin Film Transistor，薄膜晶体管）阵列层5、有机发光层6、封装层7和驱动电路8；其中，非弯折区4包括第一区域9和第二区域10，第一区域9和第二区域10通过弯折区3连接；TFT阵列层5、有机发光层6和封装层7对应第一区域9设置，且依次形成在位于第一区域9的柔性基板2上；驱动电路8设置在位于第二区域10的柔性基板2上；位于弯折区3的柔性基板2上设有从TFT阵列层5向驱动电路8延伸的金属层11，TFT阵列层5与驱动电路8通过金属层11电连通。
如图3所示，当弯折区3中的柔性基板2的长度L一定时，减小弯折区3中的柔性基板2的厚度d可以有效的减小柔性基板2在弯折过程中受到的弯折应力，本实施例中，通过减小弯折区3中的柔性基板2的厚度来减小弯折区3中的柔性基板2在弯折时所受的弯折应力，避免弯折区3中的柔性基板2在弯折过程中断裂或与相邻的其他结构剥离，从而保证了显示面板1的整体性能；另外，显示面板1也包括弯折区，且与柔性基板2的弯折区3重合，减小弯折区3中的柔性基板2的厚度即减小了显示面板1的弯折区中整体结构的厚度，与通过减小显示面板1的弯折区中金属层11或缓冲层的厚度来减小显示面板1的弯折区中整体结构的厚度以使显示面板1的弯折区中各层结构所受的应力减小的方案相比，本申请可以在不损害显示面板1的有效显示区域结构（例如金属线）的情况下显著减小显示面板1的弯折区的整体厚度，从而使位于弯折区的各层结构所受到的弯折应力减小，避免位于弯折区3的柔性基板2以及其他结构层断裂或剥离，从而提高了显示面板1的显示效果。
在一实施例中，如图2至图5所示，柔性基板2一侧的表面设有第一凹槽12，第一凹槽12对应弯折区3设置。具体的，在位于弯折区3的柔性基板2未弯折时，第一凹槽12在柔性基板2上的正投影与弯折区3在柔性基板2上的正投影重合。第一凹槽12可以设置在柔性基板2的上表面，也可以设置在柔性基板2的下表面。
具体的，第一凹槽12的深度可以是处处相同，也可以是变化的，例如弯折区3包括弯折线13，第一凹槽12的深度从弯折线13向垂直于弯折线13且远离弯折线13的方向上逐渐变小，其中，弯折线13可以是指弯折区3被弯折后曲率半径最小的中心线位置。
本实施例中，通过在弯折区3中的柔性基板2上设第一凹槽12来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度。当第一凹槽12的深度从弯折线13向垂直于弯折线13且远离弯折线13的方向上逐渐变小时，弯折区3中的柔性基板2在弯折线13处厚度最小，由于弯折线13处被弯折后的曲率半径最小，受到的弯折应力最大，也最容易断裂，减小弯折线13处的柔性基板2的厚度可以有效的减小弯折线13处的柔性基板2受到的弯折应力，避免柔性基板2断裂。
在一实施例中，如图1所示，位于弯折区3的柔性基板2向背离TFT阵列层5的方向呈180°弯曲；显示面板1还包括支撑层14，支撑层14位于柔性基板2背离TFT阵列层5的一侧；位于第一区域9的柔性基板2和位于第二区域10的柔性基板2通过支撑层14（包括背板15和粘合层16）连接固定；第一区域9包括显示区17和第一过渡区18，第二区域10包括第二过渡区20和第三区域19，显示区17和弯折区3通过第一过渡区18连接，第三区域19和弯折区3通过第二过渡区20连接，第一过渡区18和第二过渡区20对应，第三区域19和显示区17对应；TFT阵列层5、有机发光层6、支撑层14对应显示区17设置。
具体的，第一过渡区18、第二过渡区20和弯折区3都属于非显示区。本实施例中，支撑层14仅对应显示区17设置，使得弯折区3呈180°弯折后，位于第一过渡区18、弯折区3和第二过渡区20的柔性基板2与支撑层14之间形成空隙，使得位于第一过渡区18、弯折区3和第二过渡区20的柔性基板2不受支撑层14的挤压，从而使位于第一过渡区18、弯折区3和第二过渡区20的柔性基板2受到的弯折应力均衡，避免柔性基板2在弯折过程中因应力不均出现不能完全弯折或弯折后柔性基板2断裂等现象。
如图6所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2一侧的表面设有第一凹槽12，柔性基板2远离第一凹槽12一侧的表面设有第二凹槽21，第一凹槽12和第二凹槽21对应弯折区3设置。
具体的，在位于弯折区3的柔性基板2未弯折时，第一凹槽12和第二凹槽21在柔性基板2上的正投影均与弯折区3在柔性基板2上的正投影重合，且第一凹槽12和第二凹槽21的深度相同，当然第一凹槽12和第二凹槽21的深度也可以不同，此处对第一凹槽12和第二凹槽21的深度不作限制。
本实施例中，通过在弯折区3中的柔性基板2的两侧分别设置第一凹槽12和第二凹槽21来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，并且，使得弯折区3中的柔性基板2弯折后最小曲率半径增大，减小了最小曲率半径处的柔性基板2受到的弯折应力，从而保护了弯折区3中的柔性基板2最易断裂的部分。
如图7所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2一侧的表面设有第一凹槽12，柔性基板2远离第一凹槽12一侧的表面设有多个第三凹槽22，第一凹槽12和多个第三凹槽22对应弯折区3设置。
具体的，在位于弯折区3的柔性基板2未弯折时，第一凹槽12在柔性基板2上的正投影与弯折区3在柔性基板2上的正投影重合，第三凹槽22的数量可以是奇数，也可以是偶数，多个第三凹槽22均匀的分布在弯折区3中。
本实施例中，通过在弯折区3中的柔性基板2一侧的表面设置第一凹槽12来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，同时，在柔性基板2远离第一凹槽12一侧的表面设与弯折区3对应的多个第三凹槽22，多个均匀分布的第三凹槽22可以分散柔性基板2远离第一凹槽12一侧受到的弯折应力，进一步减小了弯折区3中的柔性基板2在弯折时所受到的弯折应力。
如图8所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2一侧的表面设有第一凹槽12，第一凹槽12对应弯折区3设置，且第一凹槽12的底部设有多个第四凹槽23。
具体的，第四凹槽23的数量可以是奇数，也可以是偶数，多个第四凹槽23均匀的分布在第一凹槽12的底部。
本实施例中，通过在弯折区3中的柔性基板2上设第一凹槽12来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，同时，在第一凹槽12的底部设有多个第四凹槽23，多个均匀分布的第四凹槽23可以分散第一凹槽12所在位置的柔性基板2受到的弯折应力，也进一步减小了弯折区3中的柔性基板2在弯折时所受到的弯折应力。
如图9所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2一侧的表面设有第一凹槽12，柔性基板2远离第一凹槽12一侧的表面设有第二凹槽21，第一凹槽12和第二凹槽21对应弯折区3设置，且第一凹槽12的底部设有多个第四凹槽23。
具体的，第四凹槽23的数量可以是奇数，也可以是偶数，多个第四凹槽23均匀的分布在第一凹槽12的底部。
本实施例中，通过在弯折区3中的柔性基板2的两侧分别设置第一凹槽12和第二凹槽21来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，同时，在第一凹槽12的底部设有多个第四凹槽23，多个均匀分布的第四凹槽23可以进一步分散第一凹槽12所在位置的柔性基板2受到的弯折应力，也进一步减小了弯折区3中的柔性基板2在弯折时所受到的弯折应力。
如图10所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2一侧的表面设有第一凹槽12，柔性基板2远离第一凹槽12一侧的表面设有第二凹槽21，第一凹槽12和第二凹槽21对应弯折区3设置，且第一凹槽12的底部设有多个第四凹槽23，第二凹槽21的底部设有多个第五凹槽24。
具体的，第四凹槽23和第五凹槽24的数量可以是奇数，也可以是偶数，多个第四凹槽23均匀的分布在第一凹槽12的底部，多个第五凹槽24均匀的分布在第二凹槽21的底部。
本实施例中，通过在弯折区3中的柔性基板2的两侧分别设置第一凹槽12和第二凹槽21来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，同时，在第一凹槽12的底部设有多个第四凹槽23，在第二凹槽21的底部设有多个第五凹槽24，多个均匀分布的第四凹槽23和多个均匀分布第五凹槽24分别从弯折区3中的柔性基板2的两侧同时分散了柔性基板2受到的弯折应力，也进一步减小了弯折区3中的柔性基板2在弯折时所受到的弯折应力。
如图11和图12所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2包括第一柔性层25，以及依次设置在第一柔性层25上的中间层26和第二柔性层27；第一凹槽12设置在第一柔性层25远离中间层26一侧的表面上，第二凹槽21设置在第二柔性层27远离中间层26一侧的表面上。
具体的，第一柔性层25的材料包括聚酰亚胺，第二柔性层27和第一柔性层25的材料相同，中间层26的材料包括氧化硅、氮化硅、氧化硅和氮化硅的复合材料等，中间层26一方面可以起到阻挡水氧的作用，另一方面可以起到保温作用，保护柔性基板2不受高温制程的损害。
具体的，第一凹槽12和第二凹槽21的深度相同，当然第一凹槽12和第二凹槽21的深度也可以不同，此处对第一凹槽12和第二凹槽21的厚度不作限制。
本实施例中，柔性基板2由第一柔性层25以及依次设置在第一柔性层25上的中间层26和第二柔性层27构成，通过在第一柔性层25上设置第一凹槽12以及在第二柔性层27上设置第二凹槽21来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，通过减小位于弯折区3的柔性基板2的厚度可以降低位于弯折区3中的每一层结构在弯折过程中所受到的弯折应力，避免弯折区3中的第一柔性层25、第二柔性层27和中间层26断裂或第一柔性层25和第二柔性层27分别与中间层26剥离，保证了柔性基板2结构的完整性以及功能的完整性，有效的提高了显示面板1的显示效果。
特别的，当第一凹槽12和第二凹槽21的厚度相同时，中间层26位于中性面，弯折区3中的柔性基板2在弯折过程中，中间层26所受到的弯折应力最小，有效的保护了中间层26不受破坏，且第一凹槽12和第二凹槽21也使得弯折区3中的中性面两侧的第一柔性层25和第二柔性层27受到的弯折应力减小，避免弯折区3中的第一柔性层25、第二柔性层27与中间层26发生断裂或剥离现象。
如图13所示，本申请实施例还公开了一种显示面板1，与上述实施例不同的在于，柔性基板2包括第一柔性层25，以及依次设置在第一柔性层25上的中间层26和第二柔性层27；第一凹槽12设置在第一柔性层25远离中间层26一侧的表面上，第二柔性层27远离中间层26一侧的表面设有多个第三凹槽22，多个第三凹槽22对应弯折区3设置。
具体的，第三凹槽22的数量可以是奇数，也可以是偶数，多个第三凹槽22均匀的分布在弯折区3中。
本实施例中，通过在第一柔性层25上设置第一凹槽12来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，通过减小位于弯折区3的柔性基板2的厚度可以降低弯折区3中的每一层结构在弯折过程中所受到的弯折应力，且在第二柔性层27上设置多个均匀分布的第三凹槽22进一步减小了弯折区3中的每一层结构在弯折过程中所受到的弯折应力，避免弯折区3中的第一柔性层25、第二柔性层27和中间层26断裂或剥离，保证了柔性基板2结构的完整性以及功能的完整性，有效的提高了显示面板1的显示效果。
当然，第一凹槽12的底部还可以设置多个第四凹槽23，第二凹槽21的底部还可以设置多个第五凹槽24，此处不再赘述。以上实施例中第一凹槽12、第二凹槽21、第三凹槽22、第四凹槽23和第五凹槽24在垂直于柔性基板2方向上的截面形状包括矩形和弧形。
如图14所示，本申请实施例还提供了一种显示面板1的制作方法，包括以下步骤：
S141：提供柔性基板；柔性基板包括弯折区和非弯折区；
S142：对弯折区中的柔性基板进行减薄处理，以使弯折区中的柔性基板的厚度较非弯折区中的柔性基板的厚度小。
具体的，步骤S142包括以下步骤：
如图15所示，在非弯折区4中的柔性基板2（如图15中的a所示）的表面覆盖光阻层28，以使弯折区3中的柔性基板2裸露出来，如图15中的b所示；
采用蚀刻液对裸露的柔性基板2进行蚀刻，以使弯折区3中的柔性基板2的厚度变薄，如图15中的c所示；
去除覆盖在柔性基板2上的光阻层28，如图15中的d所示。
具体的，根据不同的处理工艺可以控制减薄的厚度从纳米级到微米级。
具体的，对弯折区3中的柔性基板2减薄处理后，将在柔性基板2上形成TFT阵列层5、有机发光层6、封装层7、驱动电路8和支撑层14，并对弯折区3进行弯折，具体步骤此处不作详细描述。
本实施例中，通过减小弯折区3中的柔性基板2的厚度来减小弯折区3中的柔性基板2在弯折时所受的弯折应力，避免柔性基板2在弯折过程中断裂或与相邻的其他结构剥离，从而保证了显示面板1的整体性能；另外，显示面板1也包括弯折区3，与柔性基板2的弯折区3重合，减小弯折区3中的柔性基板2的厚度即减小了显示面板1的弯折区3中整体结构的厚度，与通过减小显示面板1的弯折区3中金属层11或缓冲层的厚度来减小显示面板1的弯折区3中整体结构的厚度从而减小显示面板1的弯折区3中各层结构所受的应力的方案相比，本申请可以在不损害显示面板1的有效显示区17域结构的情况下显著减小显示面板1的弯折区3的整体厚度，从而降低位于弯折区3的各层结构所受到的弯折应力，避免位于弯折区3的柔性基板2以及其他结构层断裂或剥离，从而提高了显示面板1的显示效果。
在一实施例中，如图16所示，柔性基板2（如图16中的e所示）包括第一柔性层25，以及依次设置在第一柔性层25上的中间层26和第二柔性层27；步骤S142包括以下步骤：
在非弯折区4中的第一柔性层25和第二柔性层27远离中间层26的一侧的表面覆盖光阻层28，以使弯折区3中的第一柔性层25和第二柔性层27裸露出来，如图16中的f所示；
采用蚀刻液对裸露的第一柔性层25和第二柔性层27进行蚀刻，以使弯折区3中的第一柔性层25和第二柔性层27的厚度变薄，如图16中的g所示；
去除覆盖在柔性基板2上的光阻层28，如图16中的h所示。
本实施例中，柔性基板2由第一柔性层25以及依次设置在第一柔性层25上的中间层26和第二柔性层27构成，通过减薄第一柔性层25和第二柔性层27的厚度来实现弯折区3中的柔性基板2的厚度小于非弯折区4中的柔性基板2的厚度，可以减小弯折区3中的每一层结构在弯折过程中所受到的弯折应力，避免弯折区3中的第一柔性层25、第二柔性层27和中间层26断裂或剥离，保证了柔性基板2结构的完整性以及功能的完整性，有效的提高了显示面板1的显示效果。
综上所述，虽然本申请已以优选实施例揭露如上，但上述优选实施例并非用以限制本申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (15)

  1. 一种显示面板，包括柔性基板，所述柔性基板包括弯折区和非弯折区，位于所述弯折区的柔性基板的厚度较位于所述非弯折区的柔性基板的厚度小。
  2. 如权利要求1所述的显示面板，其中，所述柔性基板一侧的表面设有第一凹槽，所述第一凹槽对应所述弯折区设置。
  3. 如权利要求2所述的显示面板，其中，所述柔性基板远离所述第一凹槽一侧的表面设有第二凹槽，所述第二凹槽对应所述弯折区设置。
  4. 如权利要求2所述的显示面板，其中，所述柔性基板远离所述第一凹槽一侧的表面设有多个第三凹槽，所述多个第三凹槽对应所述弯折区设置。
  5. 如权利要求2所述的显示面板，其中，所述第一凹槽的底部设有多个第四凹槽。
  6. 如权利要求3所述的显示面板，其中，所述第一凹槽的底部设有多个第四凹槽，所述第二凹槽的底部设有多个第五凹槽。
  7. 如权利要求3所述的显示面板，其中，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
    所述第一凹槽设置在所述第一柔性层远离所述中间层一侧的表面上，所述第二凹槽设置在所述第二柔性层远离所述中间层一侧的表面上。
  8. 如权利要求7所述的显示面板，其中，所述第一凹槽的底部设有多个第四凹槽，所述第二凹槽的底部设有多个第五凹槽。
  9. 如权利要求1所述的显示面板，其中，所述非弯折区包括第一区域和第二区域，所述第一区域和第二区域通过所述弯折区连接；所述显示面板还包括依次设置在位于所述第一区域的柔性基板上的TFT阵列层、有机发光层、封装层，设置在位于所述弯折区的柔性基板上的金属层，以及设置在位于所述第二区域的柔性基板上的驱动电路；所述金属层从所述TFT阵列层延伸至所述驱动电路。
  10. 如权利要求9所述的显示面板，其中，位于所述弯折区的柔性基板向背离所述TFT阵列层的方向呈180°弯曲；所述显示面板还包括支撑层，所述支撑层位于所述柔性基板背离所述TFT阵列层的一侧；且位于所述第一区域的柔性基板和位于所述第二区域的柔性基板通过所述支撑层连接固定。
  11. 如权利要求10所述的显示面板，其中，所述第一区域包括显示区和第一过渡区，所述第二区域包括第二过渡区和第三区域；所述显示区和所述弯折区通过所述第一过渡区连接，所述第三区域和所述弯折区通过所述第二过渡区连接；所述第一过渡区和所述第二过渡区对应，所述第三区域和所述显示区对应；所述TFT阵列层、所述有机发光层和所述支撑层对应所述显示区设置。
  12. 一种显示面板，包括柔性基板，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
    所述柔性基板包括弯折区和非弯折区，位于所述弯折区的柔性基板的厚度较位于所述非弯折区的柔性基板的厚度小。
  13. 一种显示面板的制作方法，包括以下步骤：
    提供柔性基板；所述柔性基板包括弯折区和非弯折区；
    对所述弯折区中的柔性基板进行减薄处理，以使所述弯折区中的柔性基板的厚度较所述非弯折区中的柔性基板的厚度小。
  14. 如权利要求13所述的显示面板的制作方法，其中，所述对所述弯折区中的柔性基板进行减薄处理，包括以下步骤：
    在所述非弯折区中的柔性基板的表面覆盖光阻层，以使所述弯折区中的柔性基板裸露出来；
    采用蚀刻液对裸露的柔性基板进行蚀刻，以使所述弯折区中的柔性基板的厚度变薄；
    去除覆盖在所述柔性基板上的光阻层。
  15. 如权利要求13所述的显示面板的制作方法，其中，所述柔性基板包括第一柔性层，以及依次设置在所述第一柔性层上的中间层和第二柔性层；
    所述对所述弯折区中的柔性基板进行减薄处理，包括以下步骤：
    在所述非弯折区中的第一柔性层和第二柔性层远离所述中间层的一侧的表面覆盖光阻层，以使所述弯折区中的第一柔性层和第二柔性层裸露出来；
    采用蚀刻液对裸露的第一柔性层和第二柔性层进行蚀刻，以使所述弯折区中的第一柔性层和第二柔性层的厚度变薄；
    去除覆盖在所述柔性基板上的光阻层。
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