WO2024255539A1 - 显示模组及其制备方法、显示装置 - Google Patents

显示模组及其制备方法、显示装置 Download PDF

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Publication number
WO2024255539A1
WO2024255539A1 PCT/CN2024/094297 CN2024094297W WO2024255539A1 WO 2024255539 A1 WO2024255539 A1 WO 2024255539A1 CN 2024094297 W CN2024094297 W CN 2024094297W WO 2024255539 A1 WO2024255539 A1 WO 2024255539A1
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WO
WIPO (PCT)
Prior art keywords
layer
display panel
cover plate
display module
display
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
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PCT/CN2024/094297
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English (en)
French (fr)
Inventor
傅景杰
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.)
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
Beijing BOE Technology Development Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
Beijing BOE Technology Development Co Ltd
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Publication date
Application filed by BOE Technology Group Co Ltd, Chengdu BOE Optoelectronics Technology Co Ltd, Beijing BOE Technology Development Co Ltd filed Critical BOE Technology Group Co Ltd
Publication of WO2024255539A1 publication Critical patent/WO2024255539A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a display module and a preparation method thereof, and a display device.
  • foldable display products generally include: a foldable display panel, and a support portion located on the side of the light-emitting surface away from the foldable display panel and used to support the foldable display panel.
  • the foldable display panel has a bending area and a non-bending area; the support portion is mostly made of stainless steel (SUS), and the portion of the support portion located on the bending area side is mostly hollowed out, and the portion of the support portion located on the bending area side is spaced from the foldable display panel, and the portion of the support portion located on the non-bending area side is in contact with the foldable display panel, so as to better support the foldable display panel while reducing the weight of the product and ensuring the folding effect.
  • SUS stainless steel
  • a display module comprising:
  • a display panel wherein the display panel has a bending area and a non-bending area surrounding the bending area;
  • a support layer located on a side away from the light emitting surface of the display panel comprising a first support portion located on a side of the bending area and a second support portion located on a side of the non-bending area; the first support portion has a hollow area and is spaced from the display panel; the second support portion is in contact with the display panel;
  • a protective cover plate is located on the light emitting surface of the display panel, wherein the protective cover plate comprises a plurality of release layers stacked in sequence in a direction away from the display panel, and two adjacent release layers in the plurality of release layers are At least one cover layer between the layers, a first hardening coating layer located on a side of the multiple release layers away from the display panel, and a second hardening coating layer located on a side of at least one release layer close to the display panel.
  • the material of the second hardening coating is the same as that of the first hardening coating.
  • the thickness of the second hardened coating layer is smaller than the thickness of the first hardened coating layer.
  • the thickness of the first hardened coating is between 5 microns and 8 microns; the thickness of the second hardened coating is between 3 microns and 4 microns.
  • the protective cover plate includes: a second hardening coating layer located on a side of each release layer close to the display panel.
  • the protective cover plate includes: a first release layer and a second release layer stacked in sequence in a direction close to the display panel.
  • the protective cover plate includes: a first hardening coating layer located on a side of the first release layer away from the display panel, and a second hardening coating layer located on a side of the first release layer close to the display panel.
  • the protective cover plate includes: a first hardening coating layer located on a side of the first release layer away from the display panel, and a second hardening coating layer located on a side of the second release layer close to the display panel.
  • the protection cover plate includes: a first cover plate layer and a second cover plate layer stacked in sequence in a direction approaching the display panel.
  • the material of the first cover plate layer and the material of the second cover plate layer both include transparent flexible materials, and the material of the first cover plate layer and the material of the second cover plate layer are different.
  • the material of the first cover layer includes: transparent glass; the material of the second cover layer includes: transparent polyimide.
  • the thickness of the second cover plate layer is smaller than the thickness of the first cover plate layer.
  • the thickness of the first cover layer is greater than or equal to 30 microns; the thickness of the second cover layer is between 2 microns and 4 microns.
  • the material of the release layer includes polyethylene terephthalate.
  • the display panel comprises: a flexible substrate and a display screen stacked in sequence in a direction away from the support layer;
  • the display module also includes:
  • a second adhesive layer located between the display panel and two adjacent film layers in the support layer and used for bonding the display panel and two adjacent film layers in the support layer;
  • the orthographic projection of the second adhesive layer located between the flexible substrate and the supporting layer on the display panel overlaps with the orthographic projection of the second supporting portion in the supporting layer on the display panel, and does not overlap with the orthographic projection of the first supporting portion in the supporting layer on the display panel, and the second adhesive layer is used to bond the flexible substrate and the second supporting portion in the supporting layer.
  • the display module further includes:
  • a waterproof protective film is located between the second support portion and the flexible substrate.
  • the first adhesive layer includes: transparent optical adhesive; and the second adhesive layer includes: pressure-sensitive adhesive.
  • the material of the support layer includes: stainless steel; and the orthographic projection of the first support portion on the display panel is in a mesh shape.
  • a method for preparing a display module for preparing the display module as described in the above aspect; the method comprising:
  • the display panel has a bending area and a non-bending area surrounding the bending area;
  • a support layer is formed on a side away from the light emitting surface of the display panel, and the formed support layer includes a first support portion located on one side of the bending area and a second support portion located on one side of the non-bending area; the first support portion has a hollow area and is spaced from the display panel; and the second support portion is in contact with the display panel;
  • a protective cover plate is formed on one side of the light emitting surface of the display panel, and the formed protective cover plate includes a plurality of release layers stacked in sequence in a direction away from the display panel, at least one cover plate layer located between two adjacent release layers in the plurality of release layers, a first hardened coating layer located on a side of the plurality of release layers away from the display panel, and a second hardened coating layer located on a side of at least one release layer close to the display panel.
  • a display device comprising: a power supply component, and the display module as described in the above aspect;
  • the power supply component is coupled to the display module and is used to supply power to the display module.
  • FIG1 is a schematic diagram of a film structure of a display module provided by an embodiment of the present disclosure.
  • FIG2 is a schematic diagram of a film layer structure of another display module provided by an embodiment of the present disclosure.
  • FIG3 is a schematic diagram of a film structure of another display module provided by an embodiment of the present disclosure.
  • FIG4 is a schematic diagram of a partial film layer of a display module based on the film layer structure shown in FIG3 ;
  • FIG5 is a schematic diagram of a film structure of another display module provided in an embodiment of the present disclosure.
  • FIG6 is a schematic diagram of a partial film layer of a display module based on the film layer structure shown in FIG5 ;
  • FIG7 is a schematic diagram of a partial film layer of a display module based on the film layer structure shown in FIG2 ;
  • FIG8 is a schematic diagram showing a comparison of four-corner warping provided by an embodiment of the present disclosure.
  • FIG9 is a schematic diagram of edge warping comparison provided by an embodiment of the present disclosure.
  • FIG10 is a schematic diagram of a film structure of another display module provided in an embodiment of the present disclosure.
  • FIG11 is a flow chart of a method for preparing a display module provided by an embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of the structure of a display device provided in an embodiment of the present disclosure.
  • the support portion for supporting the foldable display panel is located in the bending area of the foldable display panel and is spaced from the foldable display panel, which causes the foldable display product to be uneven at this position, and thus causes the foldable display product to be easily warped, so that the foldable display panel appears to have a visible and obvious arch when reflecting external light, resulting in the problem of uneven light and shadow.
  • the embodiments of the present disclosure provide a new display module that can solve the problem of uneven light and shadow in the foldable display module in the related art.
  • FIG1 is a diagram of a membrane structure of a display module provided in an embodiment of the present disclosure.
  • FIG2 is a diagram of a membrane structure of another display module provided in an embodiment of the present disclosure. Referring to FIG1 and FIG2 , it can be seen that the display module described in the embodiment of the present disclosure includes: a display panel 01, a support layer 02 located on the side of the light emitting surface away from the display panel 01, and a protective cover 03 located on the side of the light emitting surface of the display panel 01.
  • the light emitting surface side of the display panel 01 refers to the side that displays the image, and correspondingly, the side away from the light emitting surface of the display panel 01 may also be referred to as the backlight surface of the display panel 01 .
  • the display panel 01 has a bending area A1 and a non-bending area A2 surrounding the bending area A1. It can be seen that the display panel 01 can be a folding display panel, and the display module including the display panel 01 can be a folding display module. It should be noted that the bending area A1 and the non-bending area A2 here belong to different parts of the same substrate in the display panel 01.
  • the support layer 02 includes a first support portion 021 located on one side of the bending area A1 and a second support portion 022 located on one side of the non-bending area A2.
  • the first support portion 021 has a hollow area Q1 (e.g., having a plurality of through holes) and is spaced apart from (i.e., not in contact with) the display panel 01.
  • the second support portion 022 is in contact with the display panel 01. Since the first support portion 021 located on one side of the bending area A1 needs to adopt a hollow pattern design, the range of the bending area A1 can also be referred to as a pattern range.
  • the display panel 01 will be warped as shown in FIG1 within the bending area A1, that is, the display panel 01 bulges toward the side away from the second support portion 022, and the bulge of the display panel 01 at the second support portion 022 close to the two ends of the first support portion 021 is smaller than the bulge at the center of the second support portion 022.
  • the center of the second support portion 022 may refer to the location of the central axis.
  • the warped shape shown in FIG1 will further cause the second support portion 022 to be arched at the two ends of the first support portion 021, thereby forming an obvious arching phenomenon that can be seen when reflecting external light in the dark state, and the display module produces uneven light and shadow.
  • the protective cover plate 03 at least includes a plurality of release layers 031 stacked in sequence in a direction away from the display panel 01, at least one cover plate layer 032 located between two adjacent release layers 031 in the plurality of release layers 031, and a first hardened coating (HC) 033, also called an HC layer, located on the side of the plurality of release layers 031 away from the display panel 01.
  • HC first hardened coating
  • another display module described in the embodiment of the present disclosure further includes: a second hardened coating layer 034 located on the side of at least one release layer 031 close to the display panel 01.
  • the first hardened coating layer 033 is called the HC1 layer
  • the second hardened coating layer 034 is called the HC2 layer.
  • the warping forms of different cover plate layers 032 can be used to offset the shrinkage of the first hardened coating layer 033, thereby reducing the warping of the protective cover plate 03.
  • the purpose of stress offset can be achieved, and the warping of the protective cover plate 03 can also be reduced.
  • the display module as a whole can be made relatively That is, compared with the display module shown in FIG1 , the warping of the protective cover plate 03 in FIG2 is reduced, and the display module is relatively flat.
  • the embodiments of the present disclosure provide a display module, which includes: a display panel having a bending area and a non-bending area, and a protective cover plate and a support layer respectively located on the light-emitting side and the backlight side of the display panel.
  • the protective cover plate not only includes a plurality of release layers stacked in sequence and a first hardened coating layer located on the side of the plurality of release layers away from the display panel, but also includes at least one cover plate layer located between two adjacent release layers and a second hardened coating layer located on the side of at least one release layer close to the display panel.
  • the warping morphology of the cover plate layer and the second hardened coating layer can be used to offset the stress with the warping morphology of the first hardened coating layer, so that a relatively flat protective cover plate can be formed.
  • a flat protective cover plate the problem of the display module being prone to warping can be improved, so that there will be no visible and obvious arch when the display module reflects external light, thereby effectively improving the problem of uneven light and shadow in the display module.
  • At least one cover plate layer 032 in the protective cover plate 03 and each film layer located on the side of the at least one cover plate layer 032 away from the display panel 01 may be collectively referred to as a first protective cover plate cover1, and each film layer located between the at least one cover plate layer 032 and the display panel 01 may be collectively referred to as a second protective cover plate cover2 according to the preparation process sequence.
  • the first protective cover plate cover1 and the second protective cover plate cover2 may be prepared in different preparation processes. Of course, this is only a schematic illustration.
  • the protective cover plate 03 described in the embodiment of the present disclosure may include: a cover plate layer 032 .
  • the protective cover plate 03 recorded in the embodiment of the present disclosure may include: a first cover plate layer 032 - 1 and a second cover plate layer 032 - 2 stacked in sequence in a direction close to the display panel 01 , totaling two cover plate layers 032 .
  • the material of the first cover layer 032 - 1 and the material of the second cover layer 032 - 2 may both include transparent flexible materials, and the material of the first cover layer 032 - 1 and the material of the second cover layer 032 - 2 may be different.
  • the material of the first cover layer 032-1 may include: transparent glass.
  • the material of the second cover layer 032-2 may include: transparent polyimide (colorless polyimide, CPI).
  • the first cover layer 032-1 may also be called an ultra-thin flexible glass (ultra-thin glass, UTG) cover, and the second cover layer 032-2 may also be called a CPI cover.
  • the cover layer 032 in the display module shown in FIG. 1 and FIG. 2 may be a UTG cover.
  • the thickness of the second cover plate layer 032-2 (i.e., CPI cover plate) can be less than that of the first cover plate layer 032-1 (i.e., UTG cover plate). It should be noted that the thickness directions recorded in the embodiments of the present disclosure may all be perpendicular to the bearing surface of the display panel 01.
  • the thickness of the UTG cover plate may be greater than or equal to 30 micrometers ( ⁇ m), and the thickness of the CPI cover plate may be between 2 ⁇ m and 4 ⁇ m.
  • the thickness of the UTG cover plate is 30 mm, and the thickness of the CPI cover plate is 4 ⁇ m.
  • FIG. 4 also shows a single UTG cover plate before a CPI cover plate is provided, a CPI cover plate is coated on one side of the single UTG cover plate, and after the double-layer cover plate is treated by a heating curing process, the warping amount of the cover plate increases.
  • the display module will be positively warped due to uneven stress, that is, the display panel 01 is arched toward the side away from the support layer 02.
  • the UTG cover plate can be negatively warped (i.e., arched toward the side close to the display panel 01).
  • the negatively warped UTG can offset the shrinkage of the first hardening coating 033, reduce the positive warping of the first protective cover plate cover1, thereby improving the unevenness of the film layer, and then improving the problem of uneven light and shadow.
  • FIG4 can also be understood as UTG coating CPI for the first protective cover plate cover1. That is, a CPI cover plate is covered on one side of the UTG cover plate to offset the positive warping caused by the shrinkage of the HC1 layer through the negative warping of the cover plate, thereby ensuring that the first protective cover plate cover1 is flat.
  • the material of the second hardening coating layer 034 ie, the HC2 layer
  • the material of the first hardening coating layer 033 ie, the HC1 layer
  • the thickness of the second hardening coating layer 034 may be smaller than the thickness of the first hardening coating layer 033 .
  • the thickness of the first hardened coating 033 may be 5 to 8 ⁇ m, and the thickness of the second hardened coating 034 may be 3 to 4 ⁇ m.
  • the thickness of the first hardened coating 033 included in the display module may be 8 ⁇ m, and the thickness of the second hardened coating 034 may be 3 ⁇ m.
  • the protective cover plate 03 may include: a second hardened coating layer 034 located on the side of each release layer 031 close to the display panel 01. In this way, it can better ensure that the formed protective cover plate 03 is sufficiently flat, thereby better improving the light and shadow irregularity problem of the display module.
  • the protective cover plate 03 described in the embodiment of the present disclosure can be
  • the present invention comprises two release layers 031 , namely a first release layer 031 - 1 and a second release layer 031 - 2 which are sequentially stacked in a direction close to the display panel 01 .
  • the material of the release layer 031 may include polyethylene terephthalate (PET), and accordingly, the release layer 031 may also be referred to as a PET layer.
  • PET polyethylene terephthalate
  • the first release layer 031-1 may be referred to as a PET1 layer
  • the second release layer 031-2 may be referred to as a PET2 layer.
  • the protective cover plate 03 described in the embodiment of the present disclosure may include: a second hardened coating layer 034 located on the side of the first release layer 031-1 close to the display panel 01. That is, on the basis of setting the HC1 layer on the side of the first release layer 031-1 away from the display panel 01, the HC2 layer may be further set on the side of the first release layer 031-1 close to the display panel 01.
  • This implementation method can also be understood as double-sided HC coating for the first protective cover plate cover1. According to tests, by double-sided HC coating, the stress of the HC1 layer and the HC2 layer can be offset to balance the stress, thereby producing a flat first protective cover plate cover1 and improving the problem of uneven light and shadow.
  • Table 1 shows the pre-baking warpage and post-baking warpage of different positions of the display module in two scenarios, in which the first hardening coating 033 is currently only provided on the side of the first release layer 031-1 away from the display panel 01 (i.e., single-sided coating HC) and the double-sided coating HC protected by the embodiment of the present disclosure, in millimeters (mm).
  • the heating condition here is to heat at 60 degrees for 70 minutes (min) and then cool for 2 hours (h).
  • Table 1 shows the warpage of four different positions of the display module, including the upper left (i.e., the upper left side), the upper right (i.e., the upper right side), the lower left (i.e., the lower left side) and the lower right (i.e., the lower right side).
  • Table 1 tests four HC coating methods with different thicknesses.
  • the thicknesses of HC1 include 5.76mm, 5.83mm, 5.85mm and 5.68mm, respectively
  • the thicknesses of the corresponding HC2 i.e., the second hardened coating 034 include 3.3mm, 3.5mm, 3.4mm and 3.3mm, respectively.
  • Table 1 it can be seen that in the related technology of single-sided HC coating, the warpage after baking increases relative to the warpage before baking; and under the premise of setting double-sided HC coating in the embodiment of the present disclosure, the warpage after baking can be further reduced relative to the warpage before baking.
  • the embodiment of the present disclosure can produce a relatively flat first protective cover plate cover1 by adopting the method of double-sided coating of HC, thereby laying a good foundation for improving the problem of uneven light and shadow.
  • the thickness of the PET1 layer is 65 ⁇ m
  • the thickness of the HC1 layer is between 5 and 6 ⁇ m
  • the thickness of the HC2 layer is 3 ⁇ m.
  • the protective cover plate 03 described in the embodiment of the present disclosure may include: a second hardened coating 034 located on the side of the second release layer 031-2 close to the display panel 01. That is, on the basis of setting the HC1 layer on the side of the first release layer 031-1 away from the display panel 01, the HC2 layer may be further set on the side of the second release layer 031-2 close to the display panel 01. It should be noted that the display module shown in FIG6 does not further set the HC2 layer on the side of the first release layer 031-1 close to the display panel 01.
  • This implementation method can also be understood as setting a hard shrink coating for the second protective cover plate cover2, so that the second protective cover plate cover2 can be negatively warped.
  • the first protective cover plate cover1 on which the first release layer 031-1 and the first hardened coating layer 033 (i.e., PET1 layer + HC1 layer) are sequentially stacked on a UTG cover plate it will have a positive warping shape due to uneven stress.
  • the embodiment of the present disclosure further provides a second protective cover plate cover2 on one side of the UTG cover plate, including a second release layer 031-2 and a second hardened coating layer 034 (i.e., PET2 layer + HC2 layer) sequentially stacked in a direction close to the display panel 01.
  • the negative warping shape of the second protective cover plate cover2 and the positive warping shape of the first protective cover plate cover1 can offset each other's stress, thereby producing a relatively flat protective cover plate 03, thereby improving the problem of uneven light and shadow.
  • FIG8 shows the display module in two scenarios: a hard shrink coating is provided for the second protective cover plate cover2 and an HC1 layer is provided only on the side of the first release layer 031-1 away from the display panel 01 (i.e., a hard shrink coating is not provided for the second protective cover plate cover2).
  • FIG9 shows a comparison of the warping at the four corners.
  • FIG9 shows a comparison of the warping at the bent edge of the display module under the two scenarios.
  • the warping at the four corners is approximately between 3 mm and 4 mm; and after the hard shrink coating is provided for the second protective cover plate cover2, the warping at the four corners can be reduced to about 2 mm.
  • the warping at the bent edge is approximately between 0 and 1 mm; after the hard shrink coating is set for the second protective cover plate cover2, the warping at the bent edge can be maintained at about 0.5 mm to 1 mm.
  • the spacing between the support layer 02 and the display panel 01 is about 40 ⁇ m to 123 ⁇ m, and the embodiment of the present disclosure can reduce the spacing to less than 80 ⁇ m on the basis of improving the uneven light and shadow problem. It can also be further seen that the arching of the display panel can be improved to ensure that the film layer of the display module can be relatively flat.
  • the display panel 01 recorded in the embodiment of the present disclosure may include: a flexible substrate 011 and a display screen 012 stacked in sequence in a direction away from the support layer 02.
  • the display screen 012 may include a back film Ufilm and a main screen (panel, PNL) stacked in sequence.
  • the material of the flexible substrate 011 may include PI. Accordingly, as shown in FIG. 10 , the flexible substrate 011 may also be referred to as a PI layer.
  • the display module described in the embodiment of the present disclosure may further include:
  • the first adhesive layer 04 is located between two adjacent film layers in the display panel 01 and the protective cover plate 03 and is used to bond two adjacent film layers in the display panel 01 and the protective cover plate 03 .
  • a second adhesive layer 05 is located between the display panel 01 and two adjacent film layers in the support layer 02 and is used for bonding the display panel 01 and two adjacent film layers in the support layer 02 .
  • the display module may include: a first adhesive layer 04 located between the display screen 012 and the second release layer 031-2, a first adhesive layer 04 located between the second release layer 031-2 and the cover layer 032, and a first adhesive layer 04 located between the cover layer 032 and the first release layer 031-1.
  • it may also include: a second adhesive layer 05 located between the flexible substrate 011 and the support layer 03, and a second adhesive layer 05 located between the flexible substrate 011 and the display screen 012.
  • a third release layer PET3 is also provided between the second adhesive layer 05 and the display screen 012, and accordingly, a second adhesive layer 05 for bonding the third release layer PET3 and the display screen 012 is also included.
  • the first adhesive layer 04 may include: optically clear adhesive (OCA).
  • the second adhesive layer 05 may include: pressure sensitive adhesive (PSA). In this way, it can be ensured that the light emitting surface of the display panel 01 can emit light reliably.
  • each first adhesive layer 04 from the side away from the support layer 02 to the side close to the support layer 02 is labeled as OCA0, OCA1 and OCA2 respectively; and each second adhesive layer 05 from top to bottom is labeled as PSA0, PSA1 and PSA2 respectively.
  • the orthographic projection of the second adhesive layer 05 (i.e., PSA2) between the flexible substrate 01 and the support layer 02 on the display panel 01 may overlap with the orthographic projection of the second support portion 022 in the support layer 02 on the display panel 01, and may not overlap with the orthographic projection of the first support portion 021 in the support layer 02 on the display panel 01. That is, the second adhesive layer 05 may be used to bond the flexible substrate and the second support portion 022 in the support layer 02. It should be noted that the design in which the second adhesive layer 05 is disconnected at the bending area A1 may also be referred to as a disconnection design.
  • the display module described in the embodiment of the present disclosure may further include: a waterproof protective film TPU located between the second support portion 022 and the flexible substrate 01 .
  • TPU can refer to the material of the waterproof protective film: Thermoplastic Polyurethane Elastomer, Thermoplastic Urethane. That is, there is no adhesive material adhering between TPU and the supporting layer 03.
  • the material of the support layer 02 may include: stainless steel SUS.
  • the orthographic projection of the first support portion 021 on the display panel 01 may be in a mesh shape.
  • the thickness of the first release layer 031-1 (i.e., PET1 layer) can be about 65 ⁇ m; the thickness of the second release layer 031-2 (i.e., PET2 layer) can be about 50 ⁇ m; the thickness of the third release layer PET3 can be about 50 ⁇ m; the thickness of the transparent optical adhesive OCA can be about 50 ⁇ m; the thickness of the pressure-sensitive adhesive PSA can be about 20 ⁇ m or 13 ⁇ m; the thickness of the flexible substrate 011 can be about 25 ⁇ m; the thickness of the back film Ufilm in the display screen 012 can be about 65 ⁇ m; the thickness of the main screen PNL can be about 43 ⁇ m.
  • the thickness here is only for schematic illustration.
  • the embodiments of the present disclosure provide a display module, which includes: a display panel having a bending area and a non-bending area, and a protective cover plate and a support layer respectively located on the light-emitting side and the backlight side of the display panel.
  • the protective cover plate not only includes a plurality of release layers stacked in sequence and a first hardened coating layer located on the side of the plurality of release layers away from the display panel, but also includes at least one cover plate layer located between two adjacent release layers and a second hardened coating layer located on the side of at least one release layer close to the display panel.
  • the warping morphology of the cover plate layer and the second hardened coating layer can be used to offset the stress with the warping morphology of the first hardened coating layer, so that a relatively flat protective cover plate can be formed.
  • a flat protective cover plate the problem of the display module being prone to warping can be improved, so that there will be no visible and obvious arch when the display module reflects external light, thereby effectively improving the problem of uneven light and shadow in the display module.
  • FIG11 is a method for preparing a display module provided by an embodiment of the present disclosure, which can be used to prepare a display module as shown in any one of FIG2 to FIG7 and FIG10. As shown in FIG11, the preparation method includes:
  • Step 1101 Provide a display panel, wherein the provided display panel has a bending area and a non-bending area surrounding the bending area.
  • Step 1102 forming a support layer on the side away from the light emitting surface of the display panel, and the formed support layer includes a first support portion located on the bending area side and a second support portion located on the non-bending area side, the first support portion has a hollow area and is spaced from the display panel, and the second support portion is in contact with the display panel.
  • Step 1103 forming a protective cover plate on one side of the light emitting surface of the display panel, and the formed protective cover plate includes a plurality of release layers stacked in sequence in a direction away from the display panel, at least one cover plate layer located between two adjacent release layers in the plurality of release layers, a first hardened coating layer located on a side of the plurality of release layers away from the display panel, and a second hardened coating layer located on a side of at least one release layer close to the display panel.
  • the material of the second hardened coating layer may be the same as that of the first hardened coating layer.
  • the thickness of the formed second hardened coating layer may be smaller than the thickness of the first hardened coating layer.
  • the formed protective cover plate may include: a second hardening coating layer located on a side of each release layer close to the display panel.
  • the formed protection cover plate may include: a first A first release layer and a second release layer.
  • the formed protection cover plate may include: a first cover plate layer and a second cover plate layer stacked in sequence in a direction away from the display panel.
  • the material of the first cover plate layer and the material of the second cover plate layer may both include transparent flexible materials and are different.
  • the material of the first cover layer may include: transparent glass; the material of the second cover layer may include: transparent polyimide.
  • the thickness of the formed second cover layer may be smaller than the thickness of the first cover layer.
  • the display panel may include: a flexible substrate and a display screen stacked in sequence in a direction away from the support layer.
  • the preparation method may further include:
  • a first bonding layer for bonding the two adjacent film layers in the display panel and the protective cover plate is formed between the two adjacent film layers in the display panel and the protective cover plate.
  • a second adhesive layer for bonding the display panel and the two adjacent film layers in the supporting layer is formed between the display panel and the two adjacent film layers in the supporting layer.
  • the orthographic projection of the second adhesive layer formed between the flexible substrate and the supporting layer on the display panel may overlap with the orthographic projection of the second supporting portion in the supporting layer on the display panel, and may not overlap with the orthographic projection of the first supporting portion in the supporting layer on the display panel. Accordingly, it can be known that the formed second adhesive layer can be used to bond the flexible substrate and the second supporting portion in the supporting layer.
  • the preparation method may further include:
  • a waterproof protective film is formed between the second support portion and the flexible substrate.
  • the first adhesive layer formed may include: transparent optical adhesive; and the second adhesive layer formed may include: pressure-sensitive adhesive.
  • the material of the formed support layer may include: stainless steel; and the orthographic projection of the first support portion on the display panel may be in a mesh shape.
  • the embodiments of the present disclosure provide a method for preparing a display module, wherein the display module formed by the method includes a display panel having a bending area and a non-bending area, and a protective cover plate and a support layer respectively located on the light emitting side and the backlight side of the display panel.
  • the protective cover plate includes not only a plurality of release layers stacked in sequence and a first hardening coating located on the side of the plurality of release layers away from the display panel, but also includes at least one cover plate layer located between two adjacent release layers and a second hardening coating located on the side of at least one release layer close to the display panel.
  • the warping shape of the cover plate layer and the second hardening coating can be used to The stress of the warping state and the first hardened coating is offset, so that a relatively flat protective cover plate can be formed.
  • a flat protective cover plate On the basis of forming a flat protective cover plate, the problem of the display module being prone to warping can be improved, so that the display module will not have a visible obvious arch when reflecting external light, thereby effectively improving the problem of uneven light and shadow in the display module.
  • Fig. 12 is a schematic diagram of the structure of a display device provided by an embodiment of the present disclosure. As shown in Fig. 12, the display device includes: a power supply component J1, and a display module 00 as shown in any one of Figs. 2 to 7 and 10.
  • the power supply component J1 is coupled to (ie, electrically connected to) the display module 00 and is used to supply power to the display module 00 .
  • the display device described in the embodiments of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a flexible display device, a television set, and a monitor.
  • a display function such as a mobile phone, a tablet computer, a flexible display device, a television set, and a monitor.
  • Words such as “include” or “comprising” and the like mean that the elements or objects preceding “include” or “comprising” include the elements or objects listed after “include” or “comprising” and their equivalents, and do not exclude other elements or objects.

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Abstract

提供了一种显示模组及其制备方法、显示装置，属于显示技术领域。该显示模组包括：具有弯折区和非弯折区的显示面板，以及分别位于该显示面板出光面一侧和背光面一侧的保护盖板和支撑层。其中，保护盖板不仅包括依次层叠的多层离型层和位于多层离型层远离显示面板一侧的第一硬化涂层，而且还包括位于相邻两层离型层之间的至少一层盖板层和位于至少一层离型层靠近显示面板一侧的第二硬化涂层。如此，可以借用盖板层和第二硬化涂层的翘曲形态与第一硬化涂层的翘曲形态进行应力抵消，使得能够形成较为平坦的保护盖板，进而可以使得显示模组反射外界光时不会出现可见的明显拱起，有效改善显示模组出现的光影不顺问题。

Description

显示模组及其制备方法、显示装置
本公开要求于2023年6月12日提交的申请号为202310694033.X、发明名称为“显示模组及其制备方法、显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示技术领域，特别涉及一种显示模组及其制备方法、显示装置。
背景技术
近年来，随着显示技术的发展，一系列能够折叠以便于携带的折叠显示产品(如，可折叠手机)应运而生。
目前，折叠显示产品一般包括：折叠显示面板，以及位于背离折叠显示面板的出光面一侧且用于支撑折叠显示面板的支撑部。其中，折叠显示面板具有弯折区和非弯折区；支撑部多采用不锈钢(steel use stainless，SUS)材料，支撑部中位于弯折区一侧的部分多采用镂空设计，且支撑部位于弯折区一侧的部分与折叠显示面板相互间隔，支撑部位于非弯折区一侧的部分与折叠显示面板相互接触，以在较好支撑折叠显示面板的同时，减轻产品重量，确保折叠效果。
发明内容
提供了一种显示模组及其制备方法、显示装置，所述技术方案如下：
一方面，提供了一种显示模组，所述显示模组包括：
显示面板，所述显示面板具有弯折区和围绕所述弯折区的非弯折区；
位于背离所述显示面板出光面一侧的支撑层，所述支撑层包括位于所述弯折区一侧的第一支撑部和位于所述非弯折区一侧的第二支撑部；所述第一支撑部具有镂空区，且与所述显示面板间隔；所述第二支撑部与所述显示面板接触；
位于所述显示面板出光面一侧的保护盖板，所述保护盖板包括沿远离所述显示面板的方向依次层叠的多层离型层，位于所述多层离型层中相邻两层离型 层之间的至少一层盖板层，位于所述多层离型层远离所述显示面板一侧的第一硬化涂层，以及位于至少一层离型层靠近所述显示面板一侧的第二硬化涂层。
可选的，所述第二硬化涂层的材料与所述第一硬化涂层的材料相同。
可选的，所述第二硬化涂层的厚度小于所述第一硬化涂层的厚度。
可选的，所述第一硬化涂层的厚度位于5微米至8微米之间；所述第二硬化涂层的厚度位于3微米至4微米之间。
可选的，所述保护盖板包括：位于每层离型层靠近所述显示面板一侧的第二硬化涂层。
可选的，所述保护盖板包括：沿靠近所述显示面板的方向依次层叠的第一离型层和第二离型层。
可选的，所述保护盖板包括：位于所述第一离型层远离所述显示面板一侧的第一硬化涂层，以及位于所述第一离型层靠近所述显示面板一侧的第二硬化涂层。
可选的，所述保护盖板包括：位于所述第一离型层远离所述显示面板一侧的第一硬化涂层，以及位于所述第二离型层靠近所述显示面板一侧的第二硬化涂层。
可选的，所述保护盖板包括：沿靠近所述显示面板的方向依次层叠的第一盖板层和第二盖板层。
可选的，所述第一盖板层的材料和所述第二盖板层的材料均包括透明柔性材料，且所述第一盖板层的材料和所述第二盖板层的材料不同。
可选的，所述第一盖板层的材料包括：透明玻璃；所述第二盖板层的材料包括：透明聚酰亚胺。
可选的，所述第二盖板层的厚度小于所述第一盖板层的厚度。
可选的，所述第一盖板层的厚度大于等于30微米；所述第二盖板层的厚度位于2微米至4微米之间。
可选的，所述离型层的材料包括聚对苯二甲酸乙二醇酯。
可选的，所述显示面板包括：沿远离所述支撑层的方向依次层叠的柔性衬底和显示屏；
所述显示模组还包括：
位于所述显示面板和所述保护盖板中相邻两层膜层之间，且用于粘接所述 显示面板和所述保护盖板中相邻两层膜层的第一粘接层；
以及，位于所述显示面板和所述支撑层中相邻两层膜层之间，且用于粘接所述显示面板和所述支撑层中相邻两层膜层的第二粘接层；
其中，位于所述柔性衬底与所述支撑层之间的第二粘接层在所述显示面板上的正投影与所述支撑层中的第二支撑部在所述显示面板上的正投影交叠，且与所述支撑层中的第一支撑部在所述显示面板上的正投影不交叠，所述第二粘接层用于粘接所述柔性衬底和所述支撑层中的第二支撑部。
可选的，所述显示模组还包括：
位于所述第二支撑部与所述柔性衬底之间的防水保护膜。
可选的，所述第一粘接层包括：透明光学胶；所述第二粘接层包括：压敏胶。
可选的，所述支撑层的材料包括：不锈钢；且所述第一支撑部在所述显示面板上的正投影呈网状。
另一方面，提供了一种显示模组的制备方法，用于制备如上述一方面所述的显示模组；所述制备方法包括：
提供显示面板，所述显示面板具有弯折区和围绕所述弯折区的非弯折区；
在背离所述显示面板出光面的一侧形成支撑层，且形成的所述支撑层包括位于所述弯折区一侧的第一支撑部和位于所述非弯折区一侧的第二支撑部；所述第一支撑部具有镂空区，且与所述显示面板间隔；所述第二支撑部与所述显示面板接触；
在所述显示面板出光面的一侧形成保护盖板，且形成的所述保护盖板包括沿远离所述显示面板的方向依次层叠的多层离型层，位于所述多层离型层中相邻两层离型层之间的至少一层盖板层，位于所述多层离型层远离所述显示面板一侧的第一硬化涂层，以及位于至少一层离型层靠近所述显示面板一侧的第二硬化涂层。
又一方面，提供了一种显示装置，所述显示装置包括：供电组件，以及如上述一方面所述的显示模组；
其中，所述供电组件与所述显示模组耦接，并用于为所述显示模组供电。
附图说明
为了更清楚地说明本公开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公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的一种显示模组的膜层结构示意图；
图2是本公开实施例提供的另一种显示模组的膜层结构示意图；
图3是本公开实施例提供的又一种显示模组的膜层结构示意图；
图4是在图3所示膜层结构基础上示出的一种显示模组的局部膜层示意图；
图5是本公开实施例提供的再一种显示模组的膜层结构示意图；
图6是在图5所示膜层结构基础上示出的一种显示模组的局部膜层示意图；
图7是在图2所示膜层结构基础上示出的一种显示模组的局部膜层示意图；
图8是本公开实施例提供的一种四角翘曲对比示意图；
图9是本公开实施例提供的一种边缘翘曲对比示意图；
图10是本公开实施例提供的再一种显示模组的膜层结构示意图；
图11是本公开实施例提供的一种显示模组的制备方法流程图；
图12是本公开实施例提供的一种显示装置的结构示意图。
具体实施方式
为了使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。
目前，因折叠显示产品中，用于支撑折叠显示面板的支撑部位于折叠显示面板的弯折区的部分与折叠显示面板相互间隔，故导致折叠显示产品在该位置处不平整，进而导致折叠显示产品易出现翘曲，使得折叠显示面板反射外界光时出现可见的明显拱起，产生光影不顺的问题。基于此，本公开实施例提供了一种新的显示模组，可以解决相关技术中折叠显示模组易产生光影不顺的问题。
图1是本公开实施例提供的一种显示模组的膜层结构图。图2是本公开实施例提供的另一种显示模组的膜层结构图。参考图1和图2可以看出，本公开实施例记载的显示模组包括：显示面板01，位于背离显示面板01的出光面一侧的支撑层02，以及位于显示面板01的出光面一侧的保护盖板(cover)03。
需要说明的是，显示面板01的出光面一侧是指显示画面的一侧，相应的，背离显示面板01的出光面的一侧也可以称为显示面板01的背光面。
其中，继续参考图1和图2可以看出，该显示面板01具有弯折区A1和围绕弯折区A1的非弯折区A2。由此可知，该显示面板01可以为折叠显示面板，包括该显示面板01的显示模组可以为折叠显示模组。需要说明的是，这里的弯折区A1和非弯折区A2属于显示面板01中的同一个衬底的不同部分。
可选的，继续参考图1和图2可以看出，本公开实施例记载的显示模组中，支撑层02包括位于弯折区A1一侧的第一支撑部021和位于非弯折区A2一侧的第二支撑部022。并且，该第一支撑部021具有镂空区Q1(如，具有多个通孔)，且与显示面板01相互间隔(即，不接触)。第二支撑部022与显示面板01相互接触。因位于弯折区A1一侧的第一支撑部021需要采用镂空的图案化(pattern)设计，故弯折区A1所处范围也可以称为pattern范围。
对于包括上述支撑层02的显示模组而言，一旦其出现膜层不平整问题，即会导致显示面板01在弯折区A1范围内存在图1所示的上翘形态，即显示面板01朝远离第二支撑部022的一侧凸起，且显示面板01在第二支撑部022靠近第一支撑部021两端处的凸起小于在第二支撑部022中心位置处的凸起，第二支撑部022的中心位置可以是指中轴线所在位置。图1所示的上翘形态会进一步导致第二支撑部022靠近第一支撑部021两端处出现拱起现象，从而形成暗态反射外界光时可见明显的拱起现象，显示模组产生光影不顺。
继续参考图1和图2可以看出，该保护盖板03至少包括沿远离显示面板01的方向依次层叠的多层离型层031，位于多层离型层031中相邻两层离型层031之间的至少一层盖板层032，以及位于多层离型层031远离显示面板01一侧的第一硬化涂层(hard coating，HC)033，也称为HC层。
此外，参考图2还可以看出，本公开实施例记载的另一种显示模组还包括：位于至少一层离型层031靠近显示面板01一侧的第二硬化涂层034。为区分，将第一硬化涂层033称为HC1层，将第二硬化涂层034称为HC2层。
其一，在包括多层盖板层032的基础上，可以采用不同盖板层032的翘起形态相互抵消第一硬化涂层033的收缩，降低保护盖板03的翘度。其二，在设置第二硬化涂层034的基础上，可以达到应力抵消的目的，同样降低保护盖板03的翘度。在降低保护盖板03的翘度基础上，即可以使得显示模组整体能够较 为平坦，从而改善光影不顺问题。即，图2相对于图1所示显示模组而言，保护盖板03的翘度降低，显示模组较为平坦。
综上所述，本公开实施例提供了一种显示模组，该显示模组包括：具有弯折区和非弯折区的显示面板，以及分别位于该显示面板出光面一侧和背光面一侧的保护盖板和支撑层。其中，保护盖板不仅包括依次层叠的多层离型层和位于多层离型层远离显示面板一侧的第一硬化涂层，而且还包括位于相邻两层离型层之间的至少一层盖板层和位于至少一层离型层靠近显示面板一侧的第二硬化涂层。如此，可以借用盖板层和第二硬化涂层的翘曲形态与第一硬化涂层的翘曲形态进行应力抵消，使得能够形成较为平坦的保护盖板。在形成平坦的保护盖板基础上，可以改善显示模组易出现翘曲的问题，使得显示模组反射外界光时不会出现可见的明显拱起，进而有效改善显示模组出现的光影不顺问题。
可选的，在本公开实施例中，可以根据制备工艺顺序，将保护盖板03中至少一层盖板层032以及位于至少一层盖板层032远离显示面板01一侧的各膜层统称为第一保护盖板cover1，并将位于至少一层盖板层032与显示面板01之间的各膜层统称为第二保护盖板cover2。第一保护盖板cover1和第二保护盖板cover2可以在不同制备流程中制备得到。当然，此处仅是示意性说明。
可选的，参考图1和图2可以看出，本公开实施例记载的保护盖板03可以包括：一层盖板层032。
或者，参考图3和图4所示局部膜层图可以看出，本公开实施例记载的保护盖板03可以包括：沿靠近显示面板01的方向依次层叠的第一盖板层032-1和第二盖板层032-2共两层盖板层032。
并且，第一盖板层032-1的材料和第二盖板层032-2的材料均可以包括透明柔性材料，且第一盖板层032-1的材料和第二盖板层032-2的材料可以不相同。
例如，第一盖板层032-1的材料可以包括：透明玻璃。第二盖板层032-2的材料包括：透明聚酰亚胺(colorless polyimide，CPI)。相应的，第一盖板层032-1也可以称为超薄柔性玻璃(ultra-thin glass，UTG)盖板，第二盖板层032-2也可以称为CPI盖板。图1和图2所示显示模组中的盖板层032可以为UTG盖板。
可选的，继续参考图4所示的局部膜层图可知，在本公开实施例中，第二盖板层032-2(即，CPI盖板)的厚度可以小于第一盖板层032-1(即，UTG盖 板)的厚度。需要说明的是，本公开实施例记载的厚度方向可以均垂直于显示面板01的承载面。
例如，在一些实施例中，UTG盖板的厚度可以大于等于30微米(μm)，CPI盖板的厚度可以位于2μm至4μm之间。如，参考图4，其示出的显示模组中，UTG盖板的厚度为30mm，CPI盖板的厚度为4μm。
可选的，图4还示出未设置CPI盖板之前的单一UTG盖板，在单一UTG盖板一侧覆盖(coating)CPI盖板，以及采用加热固化(curing)工艺处理该双层盖板后，盖板的翘曲量增大。
需要说明的是，结合图1，在仅设置第一硬化涂层033(即，HC1层)，也即未设置第二硬化涂层034(即，HC2层)，且仅设置一个UTG盖板的基础上，会因应力不均，造成显示模组出现正翘形态，即显示面板01朝远离支撑层02的一侧拱起。而结合图4所示的工艺流程可以看出，在UTG盖板一侧再设置CPI盖板之后，可以使得UTG盖板呈负翘形态(即，朝靠近显示面板01的一侧拱起)。该负翘形态的UTG可以抵消第一硬化涂层033的收缩，降低第一保护盖板cover1的正翘度，从而改善膜层不平整现象，进而改善光影不顺问题。
需要说明的是，图4所示实现方式也可以理解为针对第一保护盖板cover1，进行UTG coating CPI。即，在UTG盖板一侧覆盖CPI盖板，以通过盖板负翘形态抵消HC1层收缩导致的正翘形态，确保第一保护盖板cover1平整。
以下实施例均以显示模组包括一层UTG盖板为例进行说明：
可选的，在本公开实施例中，第二硬化涂层034(即，HC2层)的材料和第一硬化涂层033(即，HC1层)的材料可以相同。
可选的，在本公开实施例中，第二硬化涂层034的厚度可以小于第一硬化涂层033的厚度。
例如，在一些实施例中，第一硬化涂层033的厚度可以为5至8μm，第二硬化涂层034的厚度可以为3至4μm。如，在本公开实施例中，显示模组包括的第一硬化涂层033的厚度可以为8μm，第二硬化涂层034的厚度可以为3μm。
可选的，在本公开实施例中，保护盖板03可以包括：位于每层离型层031靠近显示面板01一侧的第二硬化涂层034。如此，可以更好的确保形成的保护盖板03足够平整，进而更好的改善显示模组的光影不顺问题。
可选的，参考图1至图4还可以看出，本公开实施例记载的保护盖板03可 以包括：沿靠近显示面板01的方向依次层叠的第一离型层031-1和第二离型层031-2共两层离型层031。
示例的，离型层031的材料可以包括：聚对苯二甲酸乙二醇酯(polyethylene terephthalate，PET)，相应的，离型层031也可以称为PET层。为区分，可以将第一离型层031-1称为PET1层，将第二离型层031-2称为PET2层。
作为一种可选的实现方式，参考图5所示再一种显示模组结构图和图6示出的局部膜层图可以看出：
本公开实施例记载的保护盖板03可以包括：位于第一离型层031-1靠近显示面板01一侧的第二硬化涂层034。即，可以在第一离型层031-1远离显示面板01的一侧设置HC1层的基础上，还在第一离型层031-1靠近显示面板01的一侧设置HC2层。该实现方式也可以理解为针对第一保护盖板cover1进行的HC双面涂布。经测试，通过双面涂布HC，可以使得HC1层和HC2层相互抵消应力，使得应力平衡，从而产出平坦的第一保护盖板cover1，改善光影不顺问题。
示例的，下述表1示出了目前仅在第一离型层031-1远离显示面板01的一侧设置第一硬化涂层033(即，单面涂布HC)和本公开实施例保护的双面涂布HC两种场景下，显示模组不同位置的烤前翘曲和烤后翘曲，单位为毫米(mm)。这里加热条件为采用60度高温加热70分钟(min)之后再冷却2小时(h)。
表1
以显示模组呈矩形为例，上述表1中共示出显示模组四个不同位置的翘曲，包括左上(即，左侧上方)、右上(即，右侧上方)、左下(即，左侧下方)和右下(即，右侧下方)。且，表1中共针对四种不同厚度的HC涂布方式进行了测试。其中，HC1(即，第一硬化涂层033)的厚度分别包括5.76mm、5.83mm、5.85mm和5.68mm，对应涂布的HC2(即，第二硬化涂层034)的厚度分别包括3.3mm、3.5mm、3.4mm和3.3mm。此外，参考表1还可以看出，单面HC涂布的相关技术中，烤后翘曲相对于烤前翘曲增大；而在本公开实施例设置双面HC涂布的前提下，可以使得烤后翘曲相对于烤前翘曲进一步减小。如，对于左上位置而言，烤前翘曲为6mm，烤后翘曲减小至0.5mm。由此可以进一步看出，本公开实施例通过采用双面涂布HC的方式，可以产出较为平坦的第一保护盖板cover1，从而为改善光影不顺问题奠定良好的基础。
可选的，图6示出的显示模组中，PET1层的厚度为65μm，HC1层的厚度为5至6μm之间，HC2层的厚度为3μm。
作为另一种可选的实现方式，参考图2和图7示出的局部膜层图可以看出：
本公开实施例记载的保护盖板03可以包括：位于第二离型层031-2靠近显示面板01一侧的第二硬化涂层034。即，可以在第一离型层031-1远离显示面板01的一侧设置HC1层的基础上，还在第二离型层031-2靠近显示面板01一侧设置HC2层。需要说明的是，图6示出的显示模组未在第一离型层031-1靠近显示面板01的一侧再设置HC2层。该实现方式也可以理解为针对第二保护盖板cover2设置硬质收缩涂层，如此可以使得第二保护盖板cover2发生负翘。
结合图7所示局部膜层图也可以看出，对于在一个UTG盖板上依次层叠设置第一离型层031-1和第一硬化涂层033(即，PET1层+HC1层)的第一保护盖板cover1而言，其会因应力不均出现正翘形态，而本公开实施例通过在UTG盖板一侧再设置包括沿靠近显示面板01的方向依次层叠的第二离型层031-2和第二硬化涂层034(即，PET2层+HC2层)的第二保护盖板cover2，可以借用第二保护盖板cover2的负翘形态与第一保护盖板cover1的正翘形态相互抵消应力，从而产出较为平整的保护盖板03，进而改善光影不顺的问题。
可选的，以显示模组呈矩形为例，图8示出了针对第二保护盖板cover2设置硬质收缩涂层和仅在第一离型层031-1远离显示面板01的一侧设置HC1层(即，未针对第二保护盖板cover2设置硬质收缩涂层)两种场景下，显示模组 四角处翘曲对比图。图9示出了该两种场景下，显示模组弯折边缘翘曲对比图。
参考图8可以看出，未针对第二保护盖板cover2设置硬质收缩涂层的场景下，四角处翘曲度大概为3mm至4mm之间；而在针对第二保护盖板cover2设置硬质收缩涂层后，可以使得四角处翘曲度降低为2mm左右。
参考图9可以看出，未针对第二保护盖板cover2设置硬质收缩涂层的场景下，弯折边缘处翘曲度大概为0至1mm之间；而在针对第二保护盖板cover2设置硬质收缩涂层后，可以使得弯折边缘处翘曲度保持在0.5mm至1mm左右。
需要说明的是，目前光影不顺的场景下，支撑层02与显示面板01之间的间隔间距约为40μm至123μm之间，而本公开实施例再改善光影不顺问题的基础上，可以使得该间距降低至小于80μm。由此，也可以进一步看出，可以改善显示面板的拱起，确保显示模组的膜层可以较为平整。
可选的，参考图1和图10示出的再一种显示模组的膜层结构示意图还可以看出，本公开实施例记载的显示面板01可以包括：沿远离支撑层02的方向依次层叠的柔性衬底011和显示屏012。参考图1可以看出，显示屏012又可以包括依次层叠的背膜Ufilm和主体屏(panel，PNL)。
示例的，柔性衬底011的材料可以包括PI，相应的，如图10所示，柔性衬底011也可以称为PI层。
可选的，继续参考图1至图7和图10还可以看出，本公开实施例记载的显示模组还可以包括：
位于显示面板01和保护盖板03中相邻两层膜层之间，且用于粘接显示面板01和保护盖板03中相邻两层膜层的第一粘接层04。
以及，位于显示面板01和支撑层02中相邻两层膜层之间，且用于粘接显示面板01和支撑层02中相邻两层膜层的第二粘接层05。
例如，结合图1和图10可以看出，显示模组可以包括：位于显示屏012和第二离型层031-2之间的第一粘接层04，位于第二离型层031-2和盖板层032之间的第一粘接层04，以及位于盖板层032和第一离型层031-1之间的第一粘接层04。以及，还可以包括：位于柔性衬底011和支撑层03之间的第二粘接层05，位于柔性衬底011和显示屏012之间的第二粘接层05。此外，参考图10还可以看出，在第二粘接层05与显示屏012之间还设置有第三离型层PET3，相应的，还包括用于粘接第三离型层PET3和显示屏012的第二粘接层05。
可选的，在本公开实施例中，结合图10，第一粘接层04可以包括：透明光学胶(optically clear adhesive，OCA)。第二粘接层05可以包括：压敏胶(pressure sensitive adhesive，PSA)。如此，可以确保显示面板01的出光面可靠出光。
为区分，图中将由远离支撑层02一侧到靠近支撑层02一侧(即，从上到下)的各个第一粘接层04分别标识为OCA0、OCA1和OCA2；以及将从上到下的各个第二粘接层05分别标识为PSA0、PSA1和PSA2。
并且，参考图1和图10还可以看出，位于柔性衬底01与支撑层02之间的第二粘接层05(即，PSA2)在显示面板01上的正投影可以与支撑层02中的第二支撑部022在显示面板01上的正投影交叠，且可以与支撑层02中的第一支撑部021在显示面板01上的正投影不交叠。也即是，该第二粘接层05可以用于粘接柔性衬底和支撑层02中的第二支撑部022。需要说明的是，该第二粘接层05在弯折区A1处被断开的设计方式也可以称为断胶设计。
在一些实施例中，继续参考图1还可以看出，本公开实施例记载的显示模组还可以包括：位于第二支撑部022与柔性衬底01之间的防水保护膜TPU。
其中，TPU可以是指防水保护膜的材料：热塑性聚氨酯弹性体，Thermoplastic Urethane。也即是，TPU与支撑层03之间无胶材粘附。
可选的，在本公开实施例中，支撑层02的材料可以包括：不锈钢SUS。且如图10所示，第一支撑部021在显示面板01上的正投影可以呈网状。
可选的，继续图10可以看出，本公开实施例提供的显示模组中，第一离型层031-1(即，PET1层)的厚度可以约为65μm；第二离型层031-2(即，PET2层)的厚度可以约为50μm；第三离型层PET3的厚度可以约为50μm；透明光学胶OCA的厚度可以约为50μm；压敏胶PSA的厚度可以约为20μm或13μm；柔性衬底011的厚度可以约为25μm；显示屏012中背膜Ufilm的厚度可以约为65μm；主体屏PNL的厚度可以约为43μm。当然，此处厚度仅是示意性说明。
结合上述实施例记载可知，在本公开实施例中，为改善因图1所示结构出现正翘形态而导致的光影不顺问题，可以采用以下多种方案：其一，针对第一保护盖板cover1，进行双面涂布HC，达到应力抵消，使得应力平衡，产生较为平坦的第一保护盖板cover1；其二，针对第一保护盖板cover1，进行UTG coating CPI设计，使得负翘形态的盖板层能够抵消第一硬化涂层HC1的收缩，从而降低第一保护盖板cover1的正翘度；其三，针对第二保护盖板cover2，新增硬化 涂层HC2，使得第二保护盖板cover2发生负翘，与发生正翘的第一保护盖板cover1进行贴合后相互抵消应力，产出较为平整的保护盖板。以上，在产出平坦的保护盖板基础上，可以有效改善目前显示模组出现的光影不顺问题。需要说明的是，以上多种方案可以任意组合，从而达到更好的改善目的。
综上所述，本公开实施例提供了一种显示模组，该显示模组包括：具有弯折区和非弯折区的显示面板，以及分别位于该显示面板出光面一侧和背光面一侧的保护盖板和支撑层。其中，保护盖板不仅包括依次层叠的多层离型层和位于多层离型层远离显示面板一侧的第一硬化涂层，而且还包括位于相邻两层离型层之间的至少一层盖板层和位于至少一层离型层靠近显示面板一侧的第二硬化涂层。如此，可以借用盖板层和第二硬化涂层的翘曲形态与第一硬化涂层的翘曲形态进行应力抵消，使得能够形成较为平坦的保护盖板。在形成平坦的保护盖板基础上，可以改善显示模组易出现翘曲的问题，使得显示模组反射外界光时不会出现可见的明显拱起，进而有效改善显示模组出现的光影不顺问题。
图11是本公开实施例提供的一种显示模组的制备方法，可以用于制备如图2至图7和图10任一所示的显示模组。如图11所示，该制备方法包括：
步骤1101、提供显示面板，且提供的显示面板具有弯折区和围绕弯折区的非弯折区。
步骤1102、在背离显示面板出光面的一侧形成支撑层，且形成的支撑层包括位于弯折区一侧的第一支撑部和位于非弯折区一侧的第二支撑部，第一支撑部具有镂空区，且与显示面板间隔，第二支撑部与显示面板接触。
步骤1103、在显示面板出光面的一侧形成保护盖板，且形成的保护盖板包括沿远离显示面板的方向依次层叠的多层离型层，位于多层离型层中相邻两层离型层之间的至少一层盖板层，位于多层离型层远离显示面板一侧的第一硬化涂层，以及位于至少一层离型层靠近显示面板一侧的第二硬化涂层。
可选的，形成的第二硬化涂层的材料与第一硬化涂层的材料可以相同。
可选的，形成的第二硬化涂层的厚度可以小于第一硬化涂层的厚度。
可选的，形成的保护盖板可以包括：位于每层离型层靠近显示面板一侧的第二硬化涂层。
可选的，形成的保护盖板可以包括：沿远离显示面板的方向依次层叠的第 一离型层和第二离型层。
可选的，形成的保护盖板可以包括：沿远离显示面板的方向依次层叠的第一盖板层和第二盖板层。
可选的，形成的第一盖板层的材料和第二盖板层的材料均可以包括透明柔性材料且不相同。
例如，第一盖板层的材料可以包括：透明玻璃；第二盖板层的材料可以包括：透明聚酰亚胺。
可选的，形成的第二盖板层的厚度可以小于第一盖板层的厚度。
可选的，形成的显示面板可以包括：沿远离支撑层的方向依次层叠的柔性衬底和显示屏。以及，制备方法还可以包括：
在显示面板和保护盖板中相邻两层膜层之间，形成用于粘接显示面板和保护盖板中相邻两层膜层的第一粘接层。
以及，在显示面板和支撑层中相邻两层膜层之间，形成用于粘接显示面板和支撑层中相邻两层膜层的第二粘接层。
并且，形成的位于柔性衬底与支撑层之间的第二粘接层在显示面板上的正投影可以与支撑层中的第二支撑部在显示面板上的正投影交叠，且可以与支撑层中的第一支撑部在显示面板上的正投影不交叠。相应的可知，形成的第二粘接层可以用于粘接柔性衬底和支撑层中的第二支撑部。
可选的，制备方法还可以包括：
在第二支撑部与柔性衬底之间形成防水保护膜。
可选的，形成的第一粘接层可以包括：透明光学胶；形成的第二粘接层可以包括：压敏胶。
可选的，形成的支撑层的材料可以包括：不锈钢；且第一支撑部在显示面板上的正投影可以呈网状。
综上所述，本公开实施例提供了一种显示模组的制备方法，该方法形成的显示模组包括具有弯折区和非弯折区的显示面板，以及分别位于该显示面板出光面一侧和背光面一侧的保护盖板和支撑层。其中，保护盖板不仅包括依次层叠的多层离型层和位于多层离型层远离显示面板一侧的第一硬化涂层，而且还包括位于相邻两层离型层之间的至少一层盖板层和位于至少一层离型层靠近显示面板一侧的第二硬化涂层。如此，可以借用盖板层和第二硬化涂层的翘曲形 态与第一硬化涂层的翘曲形态进行应力抵消，使得能够形成较为平坦的保护盖板。在形成平坦的保护盖板基础上，可以改善显示模组易出现翘曲的问题，使得显示模组反射外界光时不会出现可见的明显拱起，进而有效改善显示模组出现的光影不顺问题。
图12是本公开实施例提供的一种显示装置的结构示意图。如图12所示，显示装置包括：供电组件J1，以及如图2至图7、图10任一所示的显示模组00。
其中，供电组件J1与显示模组00耦接(即，电连接)，并用于为显示模组00供电。
可选的，本公开实施例记载的显示装置可以为：手机、平板电脑、柔性显示装置、电视机和显示器等任何具有显示功能的产品或部件。
需要说明的是，本公开的实施方式部分使用的术语仅用于对本公开的实施例进行解释，而非旨在限定本公开。除非另作定义，本公开的实施方式使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。
如，本公开专利申请说明书以及权利要求书中使用的“第一”、“第二”或者“第三”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。
同样，“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。
“包括”或者“包含”等类似的词语意指出现在“包括”或者“包含”前面的元件或者物件涵盖出现在“包括”或者“包含”后面列举的元件或者物件及其等同，并不排除其他元件或者物件。
“上”、“下”、“左”或者“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则所述相对位置关系也可能相应地改变。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (20)

  1. 一种显示模组，所述显示模组包括：
    显示面板，所述显示面板具有弯折区和围绕所述弯折区的非弯折区；
    位于背离所述显示面板出光面一侧的支撑层，所述支撑层包括位于所述弯折区一侧的第一支撑部和位于所述非弯折区一侧的第二支撑部；所述第一支撑部具有镂空区，且与所述显示面板间隔；所述第二支撑部与所述显示面板接触；
    位于所述显示面板出光面一侧的保护盖板，所述保护盖板包括沿远离所述显示面板的方向依次层叠的多层离型层，位于所述多层离型层中相邻两层离型层之间的至少一层盖板层，位于所述多层离型层远离所述显示面板一侧的第一硬化涂层，以及位于至少一层离型层靠近所述显示面板一侧的第二硬化涂层。
  2. 根据权利要求1所述的显示模组，其中，所述第二硬化涂层的材料与所述第一硬化涂层的材料相同。
  3. 根据权利要求1或2所述的显示模组，其中，所述第二硬化涂层的厚度小于所述第一硬化涂层的厚度。
  4. 根据权利要求3所述的显示模组，其中，所述第一硬化涂层的厚度位于5微米至8微米之间；所述第二硬化涂层的厚度位于3微米至4微米之间。
  5. 根据权利要求1至4任一所述的显示模组，其中，所述保护盖板包括：位于每层离型层靠近所述显示面板一侧的第二硬化涂层。
  6. 根据权利要求1至4任一所述的显示模组，其中，所述保护盖板包括：沿靠近所述显示面板的方向依次层叠的第一离型层和第二离型层。
  7. 根据权利要求6所述的显示模组，其中，所述保护盖板包括：位于所述第一离型层远离所述显示面板一侧的第一硬化涂层，以及位于所述第一离型层靠近所述显示面板一侧的第二硬化涂层。
  8. 根据权利要求6所述的显示模组，其中，所述保护盖板包括：位于所述第一离型层远离所述显示面板一侧的第一硬化涂层，以及位于所述第二离型层靠近所述显示面板一侧的第二硬化涂层。
  9. 根据权利要求1至8任一所述的显示模组，其中，所述保护盖板包括：沿靠近所述显示面板的方向依次层叠的第一盖板层和第二盖板层。
  10. 根据权利要求9所述的显示模组，其中，所述第一盖板层的材料和所述第二盖板层的材料均包括透明柔性材料，且所述第一盖板层的材料和所述第二盖板层的材料不同。
  11. 根据权利要求10所述的显示模组，其中，所述第一盖板层的材料包括：透明玻璃；所述第二盖板层的材料包括：透明聚酰亚胺。
  12. 根据权利要求9至11任一所述的显示模组，其中，所述第二盖板层的厚度小于所述第一盖板层的厚度。
  13. 根据权利要求12所述的显示模组，其中，所述第一盖板层的厚度大于等于30微米；所述第二盖板层的厚度位于2微米至4微米之间。
  14. 根据权利要求1至13任一所述的显示模组，其中，所述离型层的材料包括聚对苯二甲酸乙二醇酯。
  15. 根据权利要求1至14任一所述的显示模组，其中，所述显示面板包括：沿远离所述支撑层的方向依次层叠的柔性衬底和显示屏；
    所述显示模组还包括：
    位于所述显示面板和所述保护盖板中相邻两层膜层之间，且用于粘接所述显示面板和所述保护盖板中相邻两层膜层的第一粘接层；
    以及，位于所述显示面板和所述支撑层中相邻两层膜层之间，且用于粘接 所述显示面板和所述支撑层中相邻两层膜层的第二粘接层；
    其中，位于所述柔性衬底与所述支撑层之间的第二粘接层在所述显示面板上的正投影与所述支撑层中的第二支撑部在所述显示面板上的正投影交叠，且与所述支撑层中的第一支撑部在所述显示面板上的正投影不交叠，所述第二粘接层用于粘接所述柔性衬底和所述支撑层中的第二支撑部。
  16. 根据权利要求15所述的显示模组，其中，所述显示模组还包括：
    位于所述第二支撑部与所述柔性衬底之间的防水保护膜。
  17. 根据权利要求15或16所述的显示模组，其中，所述第一粘接层包括：透明光学胶；所述第二粘接层包括：压敏胶。
  18. 根据权利要求1至17任一所述的显示模组，其中，所述支撑层的材料包括：不锈钢；且所述第一支撑部在所述显示面板上的正投影呈网状。
  19. 一种显示模组的制备方法，用于制备如权利要求1至18任一所述的显示模组；所述制备方法包括：
    提供显示面板，所述显示面板具有弯折区和围绕所述弯折区的非弯折区；
    在背离所述显示面板出光面的一侧形成支撑层，且形成的所述支撑层包括位于所述弯折区一侧的第一支撑部和位于所述非弯折区一侧的第二支撑部；所述第一支撑部具有镂空区，且与所述显示面板间隔；所述第二支撑部与所述显示面板接触；
    在所述显示面板出光面的一侧形成保护盖板，且形成的所述保护盖板包括沿远离所述显示面板的方向依次层叠的多层离型层，位于所述多层离型层中相邻两层离型层之间的至少一层盖板层，位于所述多层离型层远离所述显示面板一侧的第一硬化涂层，以及位于至少一层离型层靠近所述显示面板一侧的第二硬化涂层。
  20. 一种显示装置，所述显示装置包括：供电组件，以及如权利要求1至18任一所述的显示模组；
    其中，所述供电组件与所述显示模组耦接，并用于为所述显示模组供电。
PCT/CN2024/094297 2023-06-12 2024-05-20 显示模组及其制备方法、显示装置 Ceased WO2024255539A1 (zh)

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