WO2020124809A1 - 光学胶及显示面板 - Google Patents

光学胶及显示面板 Download PDF

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Publication number
WO2020124809A1
WO2020124809A1 PCT/CN2019/077875 CN2019077875W WO2020124809A1 WO 2020124809 A1 WO2020124809 A1 WO 2020124809A1 CN 2019077875 W CN2019077875 W CN 2019077875W WO 2020124809 A1 WO2020124809 A1 WO 2020124809A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
sub
optical adhesive
elastic modulus
adhesive layer
Prior art date
Application number
PCT/CN2019/077875
Other languages
English (en)
French (fr)
Inventor
严国春
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 US16/488,021 priority Critical patent/US20220006044A1/en
Publication of WO2020124809A1 publication Critical patent/WO2020124809A1/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
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

  • the invention relates to the field of display technology, and in particular to an optical glue and a display panel having the optical glue.
  • OLED Organic Light-Emitting Diode
  • the cover glass on the surface will be replaced with Cover Film (protective film) or called Cover window (cover window) to ensure the bending characteristics of the display.
  • Cover Film protective film
  • Cover window cover window
  • the surface hardness is required to reach a certain standard, but the OLED display module is made of multi-layer OCA glue (English name: Optically Clear Adhesive, referred to as OCA, Chinese abbreviation: optical adhesive layer), the OCA adhesive itself is relatively soft, which makes the overall surface hardness of the surface window of the cover window only 1 ⁇ 2H or even less than 7 ⁇ 9H 1H.
  • OCA adhesive layer is very important for the bending performance of the entire OLED display module.
  • the thicker OCA adhesive layer will increase the hardness of the OLED display module, which is not easy to bend.
  • the thinner OCA adhesive layer has poor adhesion , It is easy to cause the film layer to peel off due to the bending stress, which will affect the quality of the display module.
  • the selection of the OCA adhesive layer in the prior art OLED display module needs to consider key technical indicators such as hardness and thickness, and it is difficult to select the OCA adhesive layer whose bending performance and adhesive performance meet the requirements.
  • the invention provides an optical adhesive, which is provided with a first section with better hardness and a second section that is easy to be bent to solve the bending performance and bonding performance of the optical adhesive layer of the OLED display module in the prior art Poor technical problems.
  • the present invention provides an optical glue including a first section and a second section connecting the first section;
  • the hardness of the second section is less than the hardness of the first section; and the elastic modulus of the second section is less than the elastic modulus of the first section.
  • the optical glue further includes a third section, and the third section connects an end of the second section away from the first section.
  • the hardness of the second section is less than the hardness of the third section; and the elastic modulus of the second section is less than the elastic modulus of the third section .
  • the second section includes more than one odd-numbered sub-sections, and the long sides of the sub-sections and the first section and the third section The edges are parallel to each other.
  • the elastic modulus of the sub-segment in the middle is directed toward the sub-regions on both sides
  • the segments increase, and the elastic modulus of the sub-segments adjacent to the first segment and the third segment is smaller than the elastic modulus of the first segment and the third segment.
  • the sub-segments outside the sub-segment in the middle have high or low elastic modulus Alternately arranged, wherein the elastic modulus of the sub-section located in the middle is smaller than the minimum elastic modulus of the other sub-sections, and is adjacent to the first section and the third section.
  • the elastic modulus of the sub-section is smaller than the elastic modulus of the first section and the third section.
  • any two of the sub-sections symmetrically arranged with the sub-sections in the middle have the same hardness and elastic modulus.
  • the contact surface of the second section with the first section and the third section is a slope.
  • the contact surface of the second section with the first section and the third section is a curved surface.
  • the Young's modulus of the first section and the third section is 10 6 Pa ⁇ 10 9 Pa
  • the Young's modulus of the second section is 10 4 Pa ⁇ 10 6 Pa.
  • the first section, the second section, and the third section when preparing the optical glue, all use solid glue.
  • the first section and the third section use semi-solid glue
  • the second section uses solid glue
  • the first section and the third section use liquid glue
  • the second section uses solid glue
  • a display panel including a non-bending area and a bending area connected to the non-bending area and,
  • optical adhesive layer disposed between two adjacent functional layers;
  • the optical adhesive layer includes a first section and a second section connecting the first section;
  • the hardness of the second section is less than The hardness of the first section;
  • the elastic modulus of the second section is smaller than the elastic modulus of the first section;
  • the second section corresponds to the position of the bending zone
  • the first section corresponds to the position of the non-bending zone
  • the non-bending area includes a first sub-plate area and a second sub-plate area, the first sub-plate area is connected to one end of the bending area, and the second sub-plate area Connected to the other end of the bending zone;
  • the optical adhesive layer further includes a third section, the third section is connected to an end of the second section away from the first section; the first section The segment corresponds to the position of the first sub-slab area, and the third section corresponds to the position of the second sub-slab area.
  • the width of the bending section is W
  • the bending radius of the bending zone is r
  • the width W is less than or equal to the product of the bending radius r and ⁇ .
  • the display panel includes: a first functional layer, the first functional layer is a flexible substrate; a first optical adhesive layer is provided on the surface of the flexible substrate; a second functional layer, The second functional layer is an OLED layer, which is arranged on the surface of the first optical adhesive layer; the conventional optical adhesive layer is arranged on the surface of the OLED layer; and the third functional layer, which is a touch panel, It is disposed on the surface of the conventional optical adhesive layer; and the second optical adhesive layer is disposed above the touch panel.
  • the display panel includes: a first functional layer, the first functional layer is a flexible substrate; a first optical adhesive layer is provided on the surface of the flexible substrate; a second functional layer, The second functional layer is an OLED display layer, which is provided on the surface of the first optical adhesive layer; the second optical adhesive layer is provided on the surface of the OLED display layer; a third functional layer, the third functional layer A touch panel is disposed on the surface of the second optical adhesive layer; and a third optical adhesive layer is disposed above the touch panel.
  • a method for preparing an optical adhesive layer includes the following steps:
  • the hardness of the second adhesive layer is smaller than the hardness of the first adhesive layer; and the elastic modulus of the second adhesive layer is smaller than the elastic modulus of the first adhesive layer.
  • the invention provides an optical glue and a display panel having the optical glue.
  • the optical glue includes a portion corresponding to a bending area of the display panel.
  • the elastic modulus and hardness of the portion are lower than other areas of the optical glue, so that the display panel has Good bending performance.
  • FIG. 1 is a schematic diagram of a three-dimensional structure of optical glue provided by the present invention.
  • FIG. 2a is a schematic cross-sectional structure diagram of the optical adhesive provided by the present invention.
  • 2b is a schematic diagram of another cross-sectional structure of the optical adhesive provided by the present invention.
  • FIG. 3 is a schematic diagram of the structure of multiple sub-sections of the optical adhesive provided by the present invention.
  • FIG. 4 is a flow chart of preparation of an optical adhesive layer provided by the present invention.
  • 4a to 4c are schematic structural diagrams of the manufacturing process steps of the optical adhesive provided by the present invention.
  • 5a is a schematic diagram of a film structure of a display panel using the optical adhesive layer provided by the present invention.
  • 5b is a schematic diagram of another film layer structure of a display panel using the optical adhesive layer provided by the present invention.
  • FIG. 5c is a schematic diagram of a three-dimensional structure of a display panel applying the optical adhesive layer provided by the present invention.
  • FIG. 6 is another schematic structural view of a display panel using the optical adhesive layer provided by the present invention.
  • FIG. 7 is another schematic structural view of a display panel applying the optical adhesive layer provided by the present invention.
  • the present invention is directed to the technical problem of poor bending performance and bonding performance of the optical adhesive layer of the OLED display module in the prior art, and this embodiment can solve this defect.
  • the optical adhesive provided by the present invention includes a first section 102 and a second section 101 connected to an end of the first section 102; further, the second section A third section 103 is provided at the end of 101 away from the first section 102.
  • the first section 102 and the third section 103 are prepared using a first glue material, the second section 101 is formed using a second glue material, the first glue material and the second glue
  • the optical adhesive sections formed by the material have different hardness and elastic film amounts; further, the hardness and elastic film amount of the second section 101 are smaller than the elastic film amount of the first section 102, and the third The amount of elastic membrane in section 103.
  • the first section and the first section correspond to the flat section of the display device.
  • the flat section is a section that is not bent.
  • the material of the first section and the third section is harder, which can better ensure the adjacent film layer.
  • An edge contact surface is formed between the second section of the optical adhesive and the first section and the third section, since the second section is different from the first section and the third section.
  • the optical glue includes a second section 201, a first section 202 and a third section 203 connecting the two sides of the second section 201, and a second section 201 and the An edge contact surface between the first section 202 and the third section 203, wherein the edge contact surface is provided with a slope, so that the edge of the second section 201 and the first section 202, The edges of the third section 203 are staggered.
  • the area of the edge contact surface can be increased.
  • the edge contact surface with a slope is used.
  • the stress point of bending stress is determined by the second section 201 and the first
  • the edges of the section 202 and the third section 203 are dispersed into the second section 201, the first section 202, and the third section 203, so that the edge contact surface can be reduced The possibility of separation.
  • the optical adhesive includes a second section 201, a first section 202 and a third section 203 connecting the two sides of the second section 201, and a second section 201 and the The edge contact surface between the first section 202 and the third section 203, wherein the edge contact surface is arranged in an arc shape, so that the edge of the second section 201 and the first section 202, The edge of the third section 203 forms a semi-cladding.
  • the area of the edge contact surface can be increased.
  • the edge contact surface of the inclined surface is adopted as compared with the vertically arranged edge contact surface.
  • the stress points of the bending stress are dispersed from the edges of the second section 201, the first section 202, and the third section 203 to the second section 201 In the first section 202 and the third section 203, the separation of the edge contact surface can be avoided.
  • the second section of the optical glue includes one or more odd-numbered strip-shaped sub-sections; the long sides of the sub-sections are parallel to the edges of the first section and the third section.
  • the optical glue is prepared on the surface of the first substrate, and a second substrate is prepared on the surface of the optical glue, the first substrate and the second substrate are release films; the optical glue further includes a first A section, a second section and a third section, the second section includes a sub-section.
  • the elastic modulus of the first section and the second section is selected on the order of 106Pa ⁇ 109Pa, and the elastic modulus of the second section is selected on the order of 104Pa ⁇ 106Pa.
  • the optical adhesive 302 is prepared on the surface of the first substrate 301, the surface of the optical adhesive 302 is prepared with a second substrate, and the first substrate 301 is separated from the second substrate Type film; the optical glue 302 also includes a first section, a second section and a third section, the second section includes more than an odd number of sub-sections, odd number of the sub-sections along the display device The distribution of the bending direction.
  • the second section includes five of the sub-sections, including a third sub-section 3031 in the middle, a second sub-section 3032 and a fourth sub-area on both sides of the third sub-section 3031 A segment 3033, and a first sub-segment 3034 located on the other side of the second sub-segment 3032, and a fifth sub-segment 3035 located on the other side of the fourth sub-segment 3033.
  • the elastic modulus distribution of the plurality of sub-segments may be set as follows: the elastic modulus of the third sub-segment 3031 increases toward the sub-segments on both sides and is adjacent to the first The elastic modulus of the sub-sections of a section and the third section is smaller than that of the first section and the third section; that is, the third sub-section 3031
  • the elastic modulus is smaller than the elastic modulus of the second sub-section 3032 and the fourth sub-section 3033, and the elastic modulus of the first sub-section 3034 is greater than the elasticity of the second sub-section 3032
  • the modulus is smaller than the elastic modulus of the adjacent first section and the third section 302, the elastic modulus of the fifth sub-section 3035 is greater than the elasticity of the fourth sub-section 3033
  • the modulus is smaller than the elastic modulus of the adjacent first section and the third section.
  • the elastic modulus distribution of the plurality of sub-segments may also be set as follows: the sub-segments other than the third sub-segment 3031 are alternately arranged with high and low elastic modulus, wherein The elastic modulus of the sub-section is less than the minimum elastic modulus of the other sub-sections, and the elastic modulus of the sub-sections adjacent to the first section and the third section is less than The elastic modulus of the first section and the third section.
  • any two of the sub-segments arranged symmetrically to the middle sub-segment have the same hardness and elastic modulus to improve the application of the optical adhesive 302 layer
  • the symmetry of the bending of the display device
  • the method includes the following steps:
  • a first area and a second area are defined on the substrate surface.
  • the first section and the second section can be formed by roller coating; for example, using a roller provided with a first glue layer pattern on the first
  • the surface of the substrate is coated with a solid adhesive layer to form the first section, and a roller provided with a second adhesive layer pattern is applied to the surface of the first substrate to form the second section.
  • the surface of the optical adhesive formed by the second section and the first section is attached to the second substrate.
  • a first area 402 and a second area 403 are defined on the surface of the first substrate 401, and a third area 404 is formed between the first area 402 and the second area 403
  • a first solid adhesive layer is attached to the first area 402 and the second area 403 to form the first section 405, as shown in FIG. 4b, at the second base
  • a second solid adhesive layer is attached to the surface of the sheet 407 to form the bending section 406, as shown in FIG. 4c, the second substrate 407 is attached to the first substrate 401, and the bending is performed
  • the section 406 fits in the third region 404 in alignment.
  • the optical adhesive layer when the optical adhesive layer is prepared, a first area and a second area are defined on the surface of the first substrate, and a third area is formed between the first area and the second area.
  • a semi-solid curing adhesive is prepared in the first area and the second area, a solid adhesive layer is coated on the third area to form the second section, and the semi-solid curing adhesive is cured into a hard adhesive using ultraviolet light irradiation
  • the first section is formed, and the second substrate is attached to the surface of the optical adhesive layer formed by the second section and the first section.
  • the semi-solid cured adhesive has a low elastic modulus and hardness, which is similar to the elastic modulus and hardness of the rubber material of the second section, and the difference between the two when prepared at the same time is small, which is convenient for bonding.
  • the optical adhesive layer when the optical adhesive layer is prepared, a first area and a second area are defined on the surface of the first substrate, and a third area is formed between the first area and the second area.
  • a solid adhesive layer is prepared in the third area of a substrate to form the second section, and after the optical adhesive layer is attached to the display panel, liquid solidification is dropped into the first area and the second area Glue, curing the liquid curing glue into hard glue using ultraviolet light irradiation to form the first section, and attaching the surface of the optical glue layer formed by the second section and the first section The second substrate, and then prepare a film layer of other display modules on the surface of the second substrate.
  • a bendable display panel the display panel defines a bending area and a flat plate area connecting the bending area
  • the display panel includes: an OLED light emitting layer; and, An optical adhesive layer is provided on at least one side of the light-emitting layer of the OLED; the optical adhesive layer includes a first section and a second section connecting the first section; the hardness of the second section, Less than the hardness of the first section; and the elastic modulus of the second section is less than the elastic modulus of the first section; wherein, the position of the second section and the bending zone Correspondingly, the first section corresponds to the position of the flat panel area.
  • the display panel includes a back plate 501, a first optical adhesive layer 502 prepared on the surface of the back plate 501, and an OLED display prepared on the surface of the first optical adhesive layer 502 Layer 503, a conventional optical adhesive layer 504 prepared on the surface of the OLED display layer 503 (the elastic modulus and hardness of the entire surface are the same), a touch panel 505 prepared on the surface of the conventional optical adhesive layer 504, prepared on the touch A circular polarizer 506 on the surface of the control panel 505, a second optical adhesive layer 507 prepared on the surface of the circular polarizer 506, and a cover window 508 prepared on the surface of the second optical adhesive layer 507.
  • the display panel includes a back plate 501, a first optical adhesive layer 502 prepared on the surface of the back plate 501, and an OLED display prepared on the surface of the first optical adhesive layer 502 A layer 503, a second optical adhesive layer 507 prepared on the surface of the OLED display layer 503, a touch panel 505 prepared on the surface of the second optical adhesive layer 507, and a circle prepared on the surface of the touch panel 505 A polarizer 506, a third optical adhesive layer 504 prepared on the surface of the circular polarizer 506, and a cover window 508 prepared on the surface of the third optical adhesive layer 504.
  • a display panel using the above optical adhesive layer includes a back plate 501, an OLED display layer 503 provided on the back plate 501, a cover window 508 provided on the OLED display layer 503, and at least
  • the optical adhesive layer 502 disposed on both sides of the OLED display layer 503, the display device includes a first flat panel area 5091, a second flat panel area 5092, a third flat panel area 5093, and a connection to the first flat panel area 5091 A first bending area 5094 connected to the second flat plate area 5092, and a second bending area 5095 connecting the second flat plate area 5092 and the third flat plate area 5093.
  • the above-mentioned optical adhesive layer 203 is provided in the display panel;
  • the display panel includes a flat panel area 601 and a bending area 602 located in the flat panel area;
  • the flat panel area 601 includes a first sub-flat panel Area 6011, second sub-plate area 6012 and third sub-plate area 6013, the bending area includes a first bending area 6021 and a second bending area 6022;
  • the first sub-plate area 6011 and the second The sub-plate area 6012 is connected by a first bending area 6021, and the other side of the second sub-plate area 6012 is connected to the third sub-plate area 6013 by a second bending area 6022.
  • the first sub-slab area 6011, the second sub-slab area 6012, and the third sub-slab area 6013 have the same length, and any two adjacent sub-slab areas may overlap after being bent by the bending area .
  • the sum of the lengths of the first sub-plate area 6011 and the third sub-plate area 6013 is equal to or less than the length of the second sub-plate area 6012, and the first sub-plate area 6011 passes through the After the first bending area 6021 is bent, it can be attached to the surface of the second sub-plate area 6012, and the third sub-plate area 6013 can be attached to the surface after being bent by the second bending area 6022 The second sub-plate area 6012 surface.
  • the above-mentioned optical adhesive layer 703 is provided in the display panel;
  • the beneficial effects of the present invention are as follows:
  • the present invention provides an optical glue and a display panel having the optical glue.
  • the optical glue includes a portion corresponding to the bending area of the display panel, and the elastic modulus and hardness of the portion are relatively small, making the display The panel has good bending performance.

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  • Physics & Mathematics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

本发明提供一种光学胶及具有该光学胶的显示面板，光学胶包括对应于显示面板的弯折区的部分，该部分的弹性模量和硬度低于光学胶的其他区域，使得显示面板具有良好的弯折性能。

Description

光学胶及显示面板 技术领域
本发明涉及显示技术领域，尤其涉及一种光学胶及具有该光学胶的显示面板。
 背景技术
有机发光二极管（Organic Light-Emitting Diode，简称： OLED）显示器由于具有广视角、高色域、低功耗等优点，正逐渐成为显示器行业的主流，而开发柔性可折叠的OLED显示屏也逐渐成为行业发展的目标。
在Foldable（可弯折）OLED的开发过程中，首先会将表面的Cover glass（盖板玻璃）替代为Cover Film（防护膜）或叫做Cover window（覆盖窗口），以保证显示屏的弯折特性。作为显示屏，要求表面硬度达到一定的标准，但OLED显示模组是由多层OCA胶（英文全称：Optically Clear Adhesive，简称OCA，中文简称：光学胶层）组合起来的，OCA胶本身较软，这使得即使表层的Cover Window在具有7~9H硬度的情况下，整体的表面硬度也只有1~2H甚至小于1H。
OCA胶层的选择对于整个OLED显示模组的弯折性能极为重要，OCA胶层厚度较厚会增加OLED显示模组的硬度，不易弯折，OCA胶层厚度较薄，则粘接性欠佳，易导致膜层受弯折应力影响而剥离，进而影响显示模组品质。
综上所述，现有技术的OLED显示模组对于OCA胶层的选择，需考虑硬度和厚度等关键技术指标，较难选择弯折性能和粘接性能均满足需求的OCA胶层。
 技术问题
本发明提供一种光学胶，设置有硬度较好的第一区段，和易于弯折的第二区段，以解决现有技术的OLED显示模组的光学胶层弯折性能和粘接性能欠佳的技术问题。
 技术解决方案
为解决上述问题，本发明提供的技术方案如下：
本发明提供一种光学胶，所述光学胶包括第一区段，以及连接所述第一区段的第二区段；
其中，所述第二区段的硬度，小于所述第一区段的硬度；且所述第二区段的弹性模量，小于所述第一区段的弹性模量。
根据本发明一优选实施例，所述光学胶还包括第三区段，所述第三区段连接所述第二区段远离所述第一区段的一端。
根据本发明一优选实施例，所述第二区段的硬度，小于所述第三区段的硬度；且所述第二区段的弹性模量，小于所述第三区段的弹性模量。
根据本发明一优选实施例，所述第二区段包括一个以上的奇数个条形的子区段，所述子区段的长边与所述第一区段和所述第三区段的边缘相互平行。
根据本发明一优选实施例，当所述子区段包括三个以上的奇数个所述子区段时，位于中间的所述子区段的弹性模量，向位于两侧的所述子区段递增，且相邻于所述第一区段和所述第三区段的所述子区段的弹性模量，小于所述第一区段和所述第三区段的弹性模量。
根据本发明一优选实施例，当所述子区段包括三个以上的奇数个所述子区段时，位于中间的所述子区段之外的所述子区段，以弹性模量高低交替设置，其中，位于中间的所述子区段的弹性模量，小于其他所述子区段的最小弹性模量，且相邻于所述第一区段和所述第三区段的所述子区段的弹性模量，小于所述第一区段和所述第三区段的弹性模量。
根据本发明一优选实施例，以位于中间的所述子区段相对称设置的任意两个所述子区段，其硬度和弹性模量相同。
根据本发明一优选实施例，所述第二区段与所述第一区段和所述第三区段的接触面为斜面。
根据本发明一优选实施例，所述第二区段与所述第一区段和所述第三区段的接触面为弧面。
根据本发明一优选实施例，所述第一区段和所述第三区段的杨氏模量为10 6Pa～10 9Pa，所述第二区段的杨氏模量为10 4Pa～10 6Pa。
根据本发明一优选实施例，在制备所述光学胶时，所述第一区段、所述第二区段以及所述第三区段均采用固态胶。
根据本发明一优选实施例，在制备所述光学胶时，所述第一区段和所述第三区段采用半固态胶，所述第二区段采用固态胶。
根据本发明一优选实施例，在制备所述光学胶时，所述第一区段和所述第三区段采用液态胶，所述第二区段采用固态胶。
依据本发明的上述目的，提供一种显示面板，所述显示面板包括非弯折区及与所述非弯折区连接的弯折区以及，
设置在相邻两个功能层之间的光学胶层；所述光学胶层包括第一区段，以及连接所述第一区段的第二区段；所述第二区段的硬度，小于所述第一区段的硬度；且所述第二区段的弹性模量，小于所述第一区段的弹性模量；
其中，所述第二区段与所述弯折区的位置相对应，所述第一区段与所述非弯折区的位置相对应。
根据本发明一优选实施例，所述非弯折区包括第一子平板区和第二子平板区，所述第一子平板区连接所述弯折区的一端，所述第二子平板区连接所述弯折区的另一端；所述光学胶层还包括第三区段，所述第三区段连接所述第二区段远离所述第一区段的一端；所述第一区段与所述第一子平板区的位置相对应，所述第三区段与所述第二子平板区的位置相对应。
根据本发明一优选实施例，所述弯折区段的宽度为W，所述弯折区的弯折半径为r，所述宽度W小于或等于所述弯折半径r与π的乘积。
根据本发明一优选实施例，所述显示面板包括：第一功能层，所述第一功能层为柔性基底；第一所述光学胶层，设置于所述柔性基底表面；第二功能层，所述第二功能层为OLED层，设置于第一所述光学胶层表面；常规光学胶层，设置于所述OLED层表面；第三功能层，所述第三功能层为触控面板，设置于所述常规光学胶层表面；以及第二所述光学胶层，设置于所述触控面板上方。
根据本发明一优选实施例，所述显示面板包括：第一功能层，所述第一功能层为柔性基底；第一所述光学胶层，设置于所述柔性基底表面；第二功能层，所述第二功能层为OLED显示层，设置于第一所述光学胶层表面；第二所述光学胶层，设置于所述OLED显示层表面；第三功能层，所述第三功能层为触控面板，设置于第二所述光学胶层表面；以及第三所述光学胶层，设置于所述触控面板上方。
依据本发明的上述目的，还提供一种光学胶层的制备方法，所述方法包括以下步骤：
S10，在基底表面定义第一区域和第二区域；
S20，使用第一图案化滚轮在所述第一区域制备第一胶层形成第一区段；
S30，使用第二图案化滚轮在所述第二区域内制备第二胶层形成第二区段；
其中，所述第二胶层的硬度，小于所述第一胶层的硬度；且所述第二胶层的弹性模量，小于所述第一胶层的弹性模量。
 有益效果
本发明提供一种光学胶及具有该光学胶的显示面板，光学胶包括对应于显示面板的弯折区的部分，该部分的弹性模量和硬度低于光学胶的其他区域，使得显示面板具有良好的弯折性能。
 附图说明
图1为本发明提供的光学胶立体结构示意图；
图2a为本发明提供的光学胶一剖面结构示意图；
图2b为本发明提供的光学胶另一剖面结构示意图。
图3为本发明提供的光学胶的多子区段结构示意图；
图4为本发明提供的光学胶层制备流程图。
图4a至4c为本发明提供的光学胶的制备工艺步骤结构示意图。
图5a为应用本发明提供的光学胶层的显示面板一膜层结构示意图；
图5b为应用本发明提供的光学胶层的显示面板另一膜层结构示意图；
图5c为应用本发明提供的光学胶层的显示面板立体结构示意图。
图6为应用本发明提供的光学胶层的显示面板另一结构示意图；
图7为为应用本发明提供的光学胶层的显示面板又一结构示意图。
 本发明的实施方式
本发明针对现有技术的OLED显示模组的光学胶层弯折性能和粘接性能欠佳的技术问题，本实施例能够解决该缺陷。
实施例一
如图1所示，本发明提供的光学胶，所述光学胶包括第一区段102，以及连接所述第一区段102端部的第二区段101；进一步，所述第二区段101远离所述第一区段102的一端设置有第三区段103。
所述第一区段102和所述第三区段103采用第一胶材制备形成，所述第二区段101采用第二胶材制备形成，所述第一胶材和所述第二胶材所形成的光学胶区段具有不同的硬度和弹性膜量；进一步，所述第二区段101的硬度和弹性膜量小于所述第一区段102的弹性膜量，以及所述第三区段103的弹性膜量。
通过在光学胶中设置材质较软的第二区段和材料较硬的第一区段和第三区段；所述光学胶应用到显示装置内时，所述第一区段和所述第三区段对应于显示装置的平板区段，所述平板区段为不被弯折的区段，第一区段和第三区段的材质较硬，能够更好的保证相邻膜层之间的粘接性，并且能够对显示装置的非弯折区段提供支撑作用，保证显示面板的平整性；第二区段对应于显示装置的弯折区段，所述第二区段材质较软，便于所述显示装置的弯折。
实施例二
所述光学胶的第二区段与所述第一区段和第三区段之间形成有边缘接触面，所述第二区段与所述第一区段和第三区段由于具有不同的弹性模量和硬度，二者的边缘接触面的结合强度较弱，尤其是在弯曲应力的作用下更易使所述第二区段与所述第一区段及第三区段被迫分离。
如图2a所示，光学胶包括第二区段201、连接所述第二区段201两侧的第一区段202和第三区段203、以及位于所述第二区段201与所述第一区段202、所述第三区段203之间的边缘接触面，其中，所述边缘接触面呈斜面设置，使得所述第二区段201的边缘与所述第一区段202、所述第三区段203的边缘形成交错，一方面，可增加所述边缘接触面的面积。另一方面，与垂直设置的所述边缘接触面相比，采用斜面的所述边缘接触面，所述光学胶在弯曲时，弯曲应力的受力点由所述第二区段201与所述一区段202、所述第三区段203的边缘，分散至所述第二区段201、所述第一区段202以及所述第三区段203内，从而可减小所述边缘接触面分离的可能。
如图2b所示，光学胶包括第二区段201、连接所述第二区段201两侧的第一区段202和第三区段203、以及位于所述第二区段201与所述第一区段202、第三区段203之间的边缘接触面，其中，所述边缘接触面呈弧形设置，使得所述第二区段201的边缘与所述第一区段202、所述第三区段203的边缘形成半包覆，一方面，可增加所述边缘接触面的面积，另一方面，与垂直设置的所述边缘接触面相比，采用斜面的所述边缘接触面，所述光学胶在弯曲时，弯曲应力的受力点由所述第二区段201与所述第一区段202、所述第三区段203的边缘，分散至所述第二区段201、所述第一区段202以及所述第三区段203内，从而可避免所述边缘接触面分离。
实施例三
所述光学胶的第二区段包括一个或一个以上的奇数个条形子区段；所述子区段的长边与所述第一区段和所述第三区段的边缘相互平行。
所述光学胶制备于第一基片表面，所述光学胶表面制备有第二基片，所述第一基片与所述第二基片为离型膜；所述光学胶还包括第一区段、第二区段和第三区段，所述第二区段包括一个子区段。
所述第一区段、所述第二区段的弹性模量选择为106Pa~109Pa量级，所述第二区段的弹性模量选择为104Pa~106Pa量级。
如图3所示，所述光学胶302制备于第一基片301表面，所述光学胶302的表面制备有第二基片，所述第一基片301与所述第二基片为离型膜；所述光学胶302还包括第一区段、第二区段以及第三区段，所述第二区段包括一个以上的奇数个子区段，奇数个所述子区段沿显示装置的弯折方向分布。
所述第二区段包括五个所述子区段，其中包括位于中间的第三子区段3031、位于所述第三子区段3031两侧的第二子区段3032和第四子区段3033、以及位于所述第二子区段3032另一侧的第一子区段3034、和位于所述第四子区段3033另一侧的第五子区段3035。
例如，多个所述子区段的弹性模量分布可以设置为：所述第三子区段3031的弹性模量，向位于两侧的所述子区段递增，且相邻于所述第一区段、所述第三区段的所述子区段的弹性模量，小于所述第一区段、所述第三区段的弹性模量；即所述第三子区段3031的弹性模量，小于所述第二子区段3032和所述第四子区段3033的弹性模量，所述第一子区段3034的弹性模量大于所述第二子区段3032的弹性模量，且小于相邻的所述第一区段、所述第三区段302的弹性模量，所述第五子区段3035的弹性模量大于所述第四子区段3033的弹性模量，且小于相邻的所述第一区段、所述第三区段的弹性模量。
又如，多个所述子区段的弹性模量分布还可以设置为：所述第三子区段3031之外的所述子区段，以弹性模量高低交替设置，其中，位于中间的所述子区段的弹性模量，小于其他所述子区段的最小弹性模量，且相邻于所述第一区段、第三区段的所述子区段的弹性模量，小于所述第一区段、第三区段的弹性模量。
上述两种弹性模量的分布设置方案中，任意两个以位于中间的所述子区段相对称设置的所述子区段，其硬度和弹性模量相同，以提高应用该光学胶302层的显示装置的弯折对称性。
如图4所示，依据本发明的上述目的，提出一种光学胶的制备方法，所述方法包括以下步骤：
S10，在基底表面定义第一区域和第二区域。
S20，使用第一图案化滚轮在所述第一区域制备第一胶层形成第一区段。
S30，使用第二图案化滚轮在所述第二区域内制备第二胶层形成第二区段；其中，所述第二胶层的硬度，小于所述第一胶层的硬度；且所述第二胶层的弹性模量，小于所述第一胶层的弹性模量。
例如，所述光学胶在制备时，可使用滚轮涂覆的方式分别形成所述第一区段和所述第二区段；例如，使用设置有第一胶层图案的滚轮在所述第一基片表面涂覆固态胶层形成所述第一区段，使用设置有第二胶层图案的滚轮在所述第一基片表面涂覆固态胶层形成所述第二区段，在所述第二区段与所述第一区段形成的所述光学胶表面贴附所述第二基片。
又如，所述光学胶在制备时，在所述第一基片401表面定义第一区域402和第二区域403，所述第一区域402和所述第二区域403间隔形成第三区域404，如图4a所示，在所述第一区域402和所述第二区域403内贴附第一固态胶层形成所述第一区段405，如图4b所示，在所述第二基片407表面贴附第二固态胶层形成所述弯折区段406，如图4c所示，将所述第二基片407与所述第一基片401对贴，并使所述弯折区段406对位贴合于所述第三区域404。
另又如，所述光学胶层在制备时，在所述第一基片表面定义第一区域和第二区域，所述第一区域和所述第二区域间隔形成第三区域，在所述第一区域和所述第二区域内制备半固态固化胶，在所述第三区域涂覆固态胶层形成所述第二区段，使用紫外光照射将所述半固态固化胶固化成硬胶形成所述第一区段，在所述第二区段与所述第一区段形成的所述光学胶层表面贴附所述第二基片。
所述半固态固化胶的弹性模量和硬度较低，与所述第二区段的胶材的弹性模量和硬度近似，两者同时制备时差异小，便于贴合。
再如，所述光学胶层在制备时，在所述第一基片表面定义第一区域和第二区域，所述第一区域和所述第二区域间隔形成第三区域，在所述第一基片的第三区域内制备固态胶层形成所述第二区段，待所述光学胶层对贴至显示面板后，在所述第一区域和所述第二区域内滴注液态固化胶，使用紫外光照射将所述液态固化胶固化成硬胶形成所述第一区段，在所述第二区段与所述第一区段形成的所述光学胶层表面贴附所述第二基片，接着在所述第二基片表面制备其他显示模组的膜层。
依据本发明的上述目的，还提供一种可弯折的显示面板，所述显示面板定义有弯折区和连接所述弯折区的平板区，所述显示面板包括：OLED发光层；以及，光学胶层，设置于所述OLED发光层的至少一侧；所述光学胶层包括第一区段，以及连接所述第一区段的第二区段；所述第二区段的硬度，小于所述第一区段的硬度；且所述第二区段的弹性模量，小于所述第一区段的弹性模量；其中，所述第二区段与所述弯折区的位置相对应，所述第一区段与所述平板区的位置相对应。
如图5a所示，所述显示面板包括：背板501、制备于所述背板501表面的第一所述光学胶层502、制备于所述第一所述光学胶层502表面的OLED显示层503、制备于所述OLED显示层503表面的常规光学胶层504（整面弹性模量和硬度相同）、制备于所述常规光学胶层504表面的触控面板505、制备于所述触控面板505表面的圆偏光片506、制备于所述圆偏光片506表面的第二所述光学胶层507、以及制备于第二所述光学胶层507表面的覆盖窗口508。
如图5b所示，所述显示面板包括：背板501、制备于所述背板501表面的第一所述光学胶层502、制备于所述第一所述光学胶层502表面的OLED显示层503、制备于所述OLED显示层503表面的第二所述光学胶层507、制备于第二所述光学胶层507表面的触控面板505、制备于所述触控面板505表面的圆偏光片506、制备于所述圆偏光片506表面的第三所述光学胶层504、以及制备于第三所述光学胶层504表面的覆盖窗口508。
如图5c所示，应用上述光学胶层的显示面板，包括背板501、设置于所述背板501上的OLED显示层503、设置于所述OLED显示层503上的覆盖窗口508、以及至少设置于所述OLED显示层503两侧的所述光学胶层502，所述显示装置包括第一平板区5091、第二平板区5092、第三平板区5093、以及连接所述第一平板区5091与所述第二平板区5092的第一弯折区5094、以及连接所述第二平板区5092与所述第三平板区5093的第二弯折区5095。
如图6所示，所述显示面板内设置有上述光学胶层203；所述显示面板包括平板区601及位于所述平板区内的弯折区602；所述平板区601包括第一子平板区6011、第二子平板区6012以及第三子平板区6013，所述弯折区包括第一弯折区6021和第二弯折区6022；所述第一子平板区6011与所述第二子平板区6012通过第一弯折区6021连接，所述第二子平板区6012的另一侧与所述第三子平板区6013通过第二弯折区6022连接。
例如，所述第一子平板区6011、所述第二子平板区6012以及所述第三子平板区6013具有相同长度，且任意两相邻的子平板区可通过弯折区弯折后重叠。
又如，所述第一子平板区6011与所述第三子平板区6013的长度之和，等于或小于所述第二子平板区6012的长度，所述第一子平板区6011通过所述第一弯折区6021弯折后，可贴合于所述第二子平板区6012表面，所述第三子平板区6013通过所述第二弯折区6022弯折后，可贴合于所述第二子平板区6012表面。
如图7所示，所述显示面板内设置有上述光学胶层703；所述显示面板包括平板区701及位于所述平板区701内的弯折区702；所述弯折区702的宽度w，小于或等于所述显示面板的弯折半径r与π的乘积，所述显示面板的弯折半径r即当所述显示面板对折后形成的半圆弧的半径，半圆弧的周长C=πr ，所述弯折区702的宽度w需小于或等于所述半圆弧的周长C，以满足所述显示装置的弯折角度。
本发明的有益效果为：本发明提供一种光学胶及具有该光学胶的显示面板，光学胶包括对应于显示面板的弯折区的部分，该部分的弹性模量和硬度较小，使得显示面板具有良好的弯折性能。
综上所述，虽然本发明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发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (15)

  1. 一种光学胶，所述光学胶包括第一区段，以及连接所述第一区段的第二区段；
    其中，所述第二区段的硬度小于所述第一区段的硬度，且所述第二区段的弹性模量小于所述第一区段的弹性模量。
  2. 根据权利要求1所述的光学胶，其中，所述光学胶还包括第三区段，所述第三区段连接所述第二区段远离所述第一区段的一端。
  3. 根据权利要求2所述的光学胶，其中，所述第二区段的硬度小于所述第三区段的硬度，且所述第二区段的弹性模量小于所述第三区段的弹性模量。
  4. 根据权利要求3所述的光学胶，其中，所述第二区段包括一个以上的奇数个条形的子区段，所述子区段的长边与所述第一区段和所述第三区段的边缘相互平行。
  5. 根据权利要求4所述的光学胶，其中，当所述子区段包括三个以上的奇数个所述子区段时，位于中间的所述子区段的弹性模量，向位于两侧的所述子区段递增，且相邻于所述第一区段和所述第三区段的所述子区段的弹性模量，小于所述第一区段和所述第三区段的弹性模量。
  6. 根据权利要求4所述的光学胶，其中，当所述子区段包括三个以上的奇数个所述子区段时，位于中间的所述子区段之外的所述子区段，以弹性模量高低交替设置，其中，位于中间的所述子区段的弹性模量小于其他所述子区段的最小弹性模量，且相邻于所述第一区段和所述第三区段的所述子区段的弹性模量小于所述第一区段和所述第三区段的弹性模量。
  7. 根据权利要求5所述的光学胶，其中，以位于中间的所述子区段相对称设置的任意两个子区段的硬度和弹性模量相同。
  8. 根据权利要求1所述的光学胶，其中，所述第二区段与所述第一区段和所述第三区段的接触面为斜面。
  9. 根据权利要求1所述的光学胶，其中，所述第二区段与所述第一区段和所述第三区段的接触面为弧面。
  10. 根据权利要求2所述的光学胶，其中，所述第一区段和所述第三区段的杨氏模量为10 6Pa～10 9Pa，所述第二区段的杨氏模量为10 4Pa～10 6Pa。
  11. 一种显示面板，所述显示面板包括非弯折区及与所述非弯折区连接的弯折区，所述显示面板还包括：
    多个功能层；以及
    设置在相邻两个功能层之间的光学胶层；所述光学胶层包括第一区段，以及连接所述第一区段的第二区段；所述第二区段的硬度，小于所述第一区段的硬度；且所述第二区段的弹性模量，小于所述第一区段的弹性模量；
    其中，所述第二区段与所述弯折区的位置相对应，所述第一区段与所述非弯折区的位置相对应。
  12. 根据权利要求11所述的显示面板，其中，
    所述非弯折区包括第一子平板区和第二子平板区，所述第一子平板区连接所述弯折区的一端，所述第二子平板区连接所述弯折区的另一端；
    所述光学胶层还包括第三区段，所述第三区段连接所述第二区段远离所述第一区段的一端；
    所述第一区段与所述第一子平板区的位置相对应，所述第三区段与所述第二子平板区的位置相对应。
  13. 根据权利要求11所述的显示装置，其中，所述弯折区的宽度为W，所述弯折区的弯折半径为r，所述宽度W小于或等于所述弯折半径r与π的乘积。
  14. 根据权利要求11所述的显示面板，其中，所述显示面板包括：
    第一功能层，所述第一功能层为柔性基底；
    第一所述光学胶层，设置于所述柔性基底表面；
    第二功能层，所述第二功能层为OLED显示层，设置于第一所述光学胶层表面；
    常规光学胶层，设置于所述OLED显示层表面；
    第三功能层，所述第三功能层为触控面板，设置于所述常规光学胶层表面；以及，
    第二所述光学胶层，设置于所述触控面板上方。
  15. 根据权利要求11所述的显示面板，其中，所述显示面板包括：
    第一功能层，所述第一功能层为柔性基底；
    第一所述光学胶层，设置于所述柔性基底表面；
    第二功能层，所述第二功能层为OLED显示层，设置于第一所述光学胶层表面；
    第二所述光学胶层，设置于所述OLED显示层表面；
    第三功能层，所述第三功能层为触控面板，设置于第二所述光学胶层表面；以及，
    第三所述光学胶层，设置于所述触控面板上方。
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