WO2016161719A1 - 一种各向异性导电胶膜、显示装置及其返修方法 - Google Patents

一种各向异性导电胶膜、显示装置及其返修方法 Download PDF

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Publication number
WO2016161719A1
WO2016161719A1 PCT/CN2015/085428 CN2015085428W WO2016161719A1 WO 2016161719 A1 WO2016161719 A1 WO 2016161719A1 CN 2015085428 W CN2015085428 W CN 2015085428W WO 2016161719 A1 WO2016161719 A1 WO 2016161719A1
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Prior art keywords
anisotropic conductive
resin layer
display panel
display device
conductive film
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PCT/CN2015/085428
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English (en)
French (fr)
Inventor
李红
Original Assignee
京东方科技集团股份有限公司
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Priority to US15/124,328 priority Critical patent/US10940676B2/en
Publication of WO2016161719A1 publication Critical patent/WO2016161719A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
    • H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/706—Anisotropic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
    • H05K2201/10621—Components characterised by their electrical contacts
    • H05K2201/10681—Tape Carrier Package [TCP]; Flexible sheet connector
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an anisotropic conductive film, a display device, and a method for repairing the same.
  • LED Light Emitting Diode
  • OLED Organic Light Emitting Diode
  • PDP Plasma Display Panel
  • LCD Liquid Crystal Display
  • a conventional flat panel display generally includes a display panel and an external circuit, wherein the external circuit transmits a driving signal to each signal line in the display panel by electrically connecting to a pin on the substrate of the display panel.
  • the electrical connection between the external circuit and the pins on the substrate of the display panel is generally achieved by crimping using an anisotropic conductive film (ACF).
  • ACF anisotropic conductive film
  • the external circuit is misaligned with the pin on the substrate of the display panel, and the insulation layer covered by the conductive particles in the ACF is not broken due to insufficient pressure during the crimping process, and the ACF is not electrically conductive, or Due to uneven pressure during the crimping process, the insulating layer coated in the ACF outside the conductive particles is not broken, and the ACF conductive effect is poor.
  • the above-mentioned defects may cause problems such as no display or abnormal display on the display panel. Therefore, it is necessary to peel off the external circuit from the display panel to perform rework on the flat panel display.
  • the method of heating the crimping region is generally used to melt the cured ACF to separate the external circuit from the display panel.
  • the method is complicated, and the method is not Applicable to flexible display panels, causing damage to flexible display panels.
  • an embodiment of the present invention provides an anisotropic conductive film, a display device, and a method for repairing the same, to provide a new method for repairing.
  • an embodiment of the present invention provides an anisotropic conductive film comprising at least a first resin layer having positive photosensitive characteristics and conductive particles distributed in the first resin layer.
  • the method further includes: a second resin layer that is bonded to the first resin layer and has no photosensitive property, and Conductive particles distributed in the second resin layer.
  • the thickness of the first resin layer is smaller than the thickness of the second resin layer.
  • the material of the first resin layer is a photosensitive resin, and a polyimide doped with a diazonium compound.
  • An embodiment of the present invention further provides a display device including: a display panel and an external circuit; wherein
  • the display panel and the external circuit are electrically connected by the anisotropic conductive film provided by an embodiment of the present invention.
  • the first resin layer in the anisotropic conductive adhesive film is in contact with the display panel.
  • the external circuit includes: a flexible printed circuit; the flexible printed circuit passes the anisotropic conductive film and the display Electrical connection of the panel; or,
  • the external circuit includes: a printed circuit and a flip chip; wherein the flip chip is electrically connected to the display panel through the anisotropic conductive film.
  • the display panel is a flexible display panel.
  • An embodiment of the present invention further provides a method for repairing a display device, including:
  • the display panel electrically connected through the anisotropic conductive film is separated from the external circuit.
  • the method further includes:
  • the region corresponding to the anisotropic conductive film in the display device is treated with a removal liquid.
  • the removal liquid comprises: an alcohol solvent, an organic acid, and a nonionic surfactant.
  • the method further includes:
  • the display panel is treated with an organic solvent.
  • the exposure processing of the region corresponding to the anisotropic conductive film in the display device includes:
  • Exposure processing is performed on the side of the display panel in the display device.
  • the anisotropic conductive adhesive film comprising: a first resin layer having positive photosensitive characteristics and being distributed in the first resin layer Conductive particles; since the first resin layer has positive-sensing light characteristics, the first resin layer can be decomposed after the exposure process, so that when the display panel and the external circuit are bonded by the anisotropic conductive film, the defect can be
  • the first resin layer in the anisotropic conductive film is decomposed by exposing the anisotropic conductive film, so that the external circuit can be separated from the display panel to achieve rework of the display device without heating.
  • the method achieves rework, which not only simplifies the rework process, but also applies to the rework of the flexible display panel.
  • FIG. 1 is a schematic structural view of an anisotropic conductive adhesive film according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention before performing hot pressing processing in a binding process;
  • FIG. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention after performing hot pressing processing in a binding process
  • FIG. 4 is a schematic structural diagram of a display device after exposure processing according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for repairing a display device according to an embodiment of the present invention.
  • An anisotropic conductive film provided by an embodiment of the present invention, as shown in FIG. 1, includes at least a first resin layer 1 having positive photosensitive characteristics and conductive particles 2 distributed in the first resin layer 1.
  • the first resin layer since the first resin layer has a positive photosensitive property, the first resin layer can be decomposed after the exposure treatment, and thus, an anisotropic conductive film is utilized.
  • the first resin layer in the anisotropic conductive film may be decomposed by exposing the anisotropic conductive film to separate the external circuit from the display panel. Rework of the display device without reheating is required, which not only simplifies the rework process, but also applies to the rework of the flexible display panel.
  • the conductive particles distributed in the first resin layer can ensure that the anisotropic conductive film is bonded to the display panel and the external circuit.
  • the display panel is electrically connected to the external circuit.
  • the second resin layer may be further bonded to the first resin layer 1 and has no photosensitive property. 3 and conductive particles 2 distributed in the second resin layer 3. Adding the second resin layer 3 to the anisotropic conductive film can enhance the adhesion of the anisotropic conductive film, and can avoid the phenomenon of falling off when the display panel and the external circuit are bonded by the anisotropic conductive film. .
  • the conductive particles distributed in the first resin layer and the conductive particles in the second resin layer can ensure the anisotropic conductive film is When the display panel and the external circuit are bound, the display panel is electrically connected to the external circuit.
  • the first resin layer needs to be decomposed by exposure processing.
  • the thickness of the first resin layer 1 is set to be smaller than the thickness of the second resin layer 3.
  • the material of the first resin layer may be a photosensitive resin, that is, a photosensitive resin-containing resin material formed by a chemical reaction; or A photosensitive agent is incorporated as a material of the first resin layer in the material of the second resin layer.
  • the material of the second resin layer may be polyimide resin (PI) or polyethylene naphthalate (
  • the sensitizer may be a diazonium compound or the like
  • the material of the first resin layer may be a polyimide resin doped with a diazonium compound or a poly samarium compound-containing compound.
  • a combination of one or more of ethylene naphthalate is not limited herein.
  • the photosensitive agent or the photosensitive group in the first resin layer can react under the irradiation of light of a corresponding wavelength, The first resin layer is prevented from decomposing in the natural environment to affect the performance of the anisotropic conductive film.
  • a sensitizer which is insensitive to natural light or a photosensitive group which is insensitive to natural light is incorporated in the first resin layer, for example, An ultraviolet light-sensitive sensitizer may be incorporated into the first resin layer or a photosensitive group sensitive to ultraviolet light may be formed; or a sensitizer sensitive to infrared light may be incorporated into the first resin layer or a pair of infrared rays may be generated.
  • the light-sensitive photosensitive group is not limited herein.
  • an embodiment of the present invention further provides a display device, as shown in FIG. 2 and FIG. 3, including: a display panel 4 (FIG. 2 and FIG. 3 only show a binding area of the display panel) and an external connection. Circuit 5; wherein
  • the display panel 4 and the external circuit 5 are electrically connected by the above-mentioned anisotropic conductive film provided by an embodiment of the present invention.
  • 2 and 3 each illustrate an example in which the anisotropic conductive paste film includes the second resin layer 3, the first resin layer 1, and the conductive particles 2 distributed in the second resin layer 3 and the first resin layer 1, as an example, wherein Figure 2 shows the display device before the hot pressing process in the binding process, and Figure 3 shows the display device after the hot pressing in the bonding process.
  • the anisotropic conductive film bonded to the display panel and the external circuit contains the first resin layer having positive photosensitive characteristics, In this way, when the display panel and the external circuit are bonded by the anisotropic conductive film, the first resin layer in the anisotropic conductive film can be decomposed by exposing the anisotropic conductive film. Therefore, the external circuit can be separated from the display panel to implement the rework of the display device without reheating by heating, so that the rework process can be simplified and the flexible display panel can be reworked.
  • the display device provided by one embodiment of the present invention may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the anisotropic conductive film comprises only the first resin layer or the anisotropic conductive film comprises the second resin layer and the first resin layer, due to the display
  • the light transmittance of the panel is better than that of the external circuit. Therefore, as shown in FIG. 2 and FIG. 3, the first resin layer 1 in the anisotropic conductive film can be in contact with the display panel 4, as shown in FIG. It is shown that exposure processing is performed on the side of the display panel 4 when the anisotropic conductive film is subjected to exposure processing (as indicated by an arrow shown in FIG. 4).
  • the first resin layer in the anisotropic conductive film may also be in contact with an external circuit.
  • it is necessary to extend the exposure processing time which is not limited herein.
  • the external circuit may be a Flexible Printed Circuit (FPC); the flexible printed circuit is electrically connected to the display panel through the anisotropic conductive film; or
  • the external circuit may also include: a printed circuit (PC) and a chip on film (COF); wherein the printed circuit is electrically connected to the flip chip through an anisotropic conductive film, and the flip chip passes through The anisotropic conductive film is electrically connected to the display panel.
  • FPC Flexible Printed Circuit
  • COF chip on film
  • the external circuit is not limited to the flexible printed circuit, nor is it limited to the printed circuit and the flip chip, and may be other circuits that can load the display panel with the driving signal. This is not limited.
  • the display panel may be a flexible display panel, that is, the anisotropic conductive film provided by one embodiment of the present invention is particularly suitable for a flexible display panel, and the flexible display is
  • the external circuit and the flexible display panel can be separated by exposure processing to realize the repair of the flexible display device without heating. Repair, will not cause damage to the flexible display panel.
  • an embodiment of the present invention further provides a method for repairing a display device. As shown in FIG. 5, the method includes the following steps:
  • S501 performing exposure processing on a region corresponding to the anisotropic conductive adhesive film in the display device to decompose the first resin layer in the anisotropic conductive adhesive film;
  • the display panel and the external circuit in the display device can be separated only by performing exposure processing on the region corresponding to the anisotropic conductive adhesive film in the display device, the display can be realized.
  • the rework of the device eliminates the need for heating for rework, which not only simplifies the rework process, but can also be applied to rework the flexible display panel.
  • the photosensitive agent or photosensitive group in the first resin layer can react under irradiation of light of a corresponding wavelength, in order to avoid the first resin layer Decomposition in the natural environment to affect the performance of an anisotropic conductive film, generally incorporating a sensitizer that is insensitive to natural light or a photosensitive group that is insensitive to natural light in the first resin layer, for example, may be in the first resin
  • the layer is doped with a sensitizer sensitive to ultraviolet light or a photosensitive group sensitive to ultraviolet light, and the exposure treatment may be irradiated with ultraviolet light; or, the sensitizer sensitive to infrared light may be incorporated into the first resin layer.
  • a photosensitive group sensitive to infrared light is generated, and the exposure treatment is performed by infrared light irradiation, which is not limited herein.
  • step S501 in the above method provided by an embodiment of the present invention when performing an exposure process on a region corresponding to the anisotropic conductive film in the display device, for example, as shown in FIG.
  • the first resin layer in the anisotropic conductive paste film between the metal wire 6 on the fourth electrode and the metal wire 7 on the external circuit 5 is not easily broken due to being blocked by the metal wire 6 on the display panel 4, and therefore,
  • the embodiment of the present invention is provided.
  • step S502 of the above method before the display panel in the display device is separated from the external circuit, the method may further include the following steps:
  • the metal wire 6 located on the display panel 4 and the external electrical connection can be The anisotropic conductive film between the metal wires 7 on the road 5 is removed, so that the external circuit 5 can be easily removed from the display panel 4.
  • the removal liquid may be injected into the gap 8 (formed after the exposed first resin layer is decomposed) at the edge in the display device.
  • the display device can be processed by other methods using an anisotropic conductive film, which is not limited herein.
  • the removal liquid may include: an alcohol solvent, an organic acid, a nonionic surfactant, and the like.
  • the component of the removal liquid is not limited thereto, and is not limited herein.
  • the method may further include the following steps:
  • the display panel is processed by using an organic solvent; preferably, the binding area of the display panel can be gently wiped with alcohol, so that good conditions can be provided for the next binding.
  • the first resin layer and the display in the anisotropic conductive film may be displayed.
  • the display panel in the device is in contact with the display panel in the display device when performing the exposure processing on the region corresponding to the anisotropic conductive film in the display device in step S501 in the above method provided by an embodiment of the present invention.
  • the exposure treatment is performed on the side, so that the exposure effect of the first resin layer can be ensured.
  • the first resin layer in the anisotropic conductive film may also be in contact with an external circuit.
  • it is necessary to extend the exposure processing time which is not limited herein.
  • An anisotropic conductive adhesive film, a display device and a repairing method thereof comprising: a first resin layer having positive photosensitive characteristics and distributed in the first resin layer The conductive particles; since the first resin layer has a positive photosensitive property, the first resin layer can be decomposed after the exposure treatment, so that when the display panel and the external circuit are bonded by the anisotropic conductive film, the display layer and the external circuit are defective.
  • the first resin layer in the anisotropic conductive film can be decomposed by exposing the anisotropic conductive film, so that the external circuit can be separated from the display panel to realize the display device. Rework, without the need for heating for rework, so that not only can the rework process be simplified, but it can also be applied to rework the flexible display panel.

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Abstract

提供了一种各向异性导电胶膜、显示装置及其返修方法。各向异性导电胶膜包括：具有正性感光特性的第一树脂层（1）和分布在第一树脂层（1）内的导电粒子（2）；由于第一树脂层（1）具有正性感光特性，因此，第一树脂层（1）在曝光处理后可以被分解，这样，在利用各向异性导电胶膜绑定显示面板（4）和外接电路（5）出现不良时，可以采用对各向异性导电胶膜进行曝光处理的方式使各向异性导电胶膜中的第一树脂层（1）分解，从而可以将外接电路（5）与显示面板（4）分离以实现对显示装置的返修，而无需采用加热的方式实现返修，这样，不仅可以简化返修过程，还能适用于对柔性显示面板进行返修。

Description

一种各向异性导电胶膜、显示装置及其返修方法 技术领域
本发明涉及显示技术领域，尤其涉及一种各向异性导电胶膜、显示装置及其返修方法。
背景技术
随着显示技术的不断发展，发光二极管(Light Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)、等离子显示器(Plasma Display Panel，PDP)及液晶显示器(Liquid Crystal Display，LCD)等平板显示器发展迅速。
现有的平板显示器一般包括显示面板和外接电路，其中，外接电路通过与显示面板的基板上的引脚电性连接来实现对显示面板中的各信号线传递驱动信号。外接电路与显示面板的基板上的引脚电性连接一般利用各向异性导电胶膜(Anisotropic Conductive Film，ACF)通过压接的方式来实现，然而，在压接的过程中容易出现各种不良，例如，外接电路与显示面板的基板上的引脚对位错位，在压接过程中由于压力不足导致ACF中包覆在导电粒子外的绝缘层未破碎进而出现ACF不导电的问题，或在压接过程中由于压力不均导致ACF中包覆在部分导电粒子外的绝缘层未破碎进而出现ACF导电效果不良的问题等。上述不良会使显示面板出现不显示或显示异常等问题，因此，需要将外接电路从显示面板上剥离以实现对平板显示器的返修。
在现有的对平板显示器进行返修的方法中，一般采用对压接区域进行加热的方法使已固化的ACF融化以使外接电路与显示面板分离，然而，该方法较为复杂，并且，该方法不适用于柔性显示面板，会对柔性显示面板造成损坏。
因此，如何提供一种新的返修方法，是本领域技术人员亟需解决的技术问题。
发明内容
有鉴于此，本发明一个实施例提供了一种各向异性导电胶膜、显示装置及其返修方法，用以提供一种新的返修方法。
因此，本发明一个实施例提供了一种各向异性导电胶膜，至少包括：具有正性感光特性的第一树脂层和分布在所述第一树脂层内的导电粒子。
在一种可能的实现方式中，在本发明一个实施例提供的上述各向异性导电胶膜中，还包括：与所述第一树脂层相贴合且不具有感光特性的第二树脂层和分布在所述第二树脂层内的导电粒子。
在一种可能的实现方式中，在本发明一个实施例提供的上述各向异性导电胶膜中，所述第一树脂层的厚度小于所述第二树脂层的厚度。
在一种可能的实现方式中，在本发明一个实施例提供的上述各向异性导电胶膜中，所述第一树脂层的材料为光敏树脂、掺有重氮醌类化合物的聚酰亚胺树脂、掺有重氮醌类化合物的聚萘二甲酸乙二醇酯中一种或多种的组合。
本发明一个实施例还提供了一种显示装置，包括：显示面板与外接电路；其中，
所述显示面板与所述外接电路通过本发明一个实施例提供的上述各向异性导电胶膜电性连接。
在一种可能的实现方式中，在本发明一个实施例提供的上述显示装置中，所述各向异性导电胶膜中的第一树脂层与所述显示面板接触。
在一种可能的实现方式中，在本发明一个实施例提供的上述显示装置中，所述外接电路包括：柔性印刷电路；所述柔性印刷电路通过所述各向异性导电胶膜与所述显示面板电性连接；或者，
外接电路包括：印刷电路和覆晶薄膜；其中，所述覆晶薄膜通过所述各向异性导电胶膜与所述显示面板电性连接。
在一种可能的实现方式中，在本发明一个实施例提供的上述显示装置中，所述显示面板为柔性显示面板。
本发明一个实施例还提供了一种显示装置的返修方法，包括：
对显示装置中与各向异性导电胶膜对应的区域进行曝光处理，使所述各向异性导电胶膜中的第一树脂层分解；
将通过所述各向异性导电胶膜电性连接的显示面板与外接电路进行分离。
在一种可能的实现方式中，在本发明一个实施例提供的上述方法中，在曝光处理之后，在将显示面板与外接电路分离之前，还包括：
利用去除液对所述显示装置中与所述各向异性导电胶膜对应的区域进行处理。
在一种可能的实现方式中，在本发明一个实施例提供的上述方法中，所述去除液包括：酒精系溶剂、有机酸和非离子界面活性剂。
在一种可能的实现方式中，在本发明一个实施例提供的上述方法中，在将显示面板与外接电路分离之后，还包括：
利用有机溶剂对所述显示面板进行处理。
在一种可能的实现方式中，在本发明一个实施例提供的上述方法中，在所述各向异性导电胶膜中的第一树脂层与所述显示装置中的显示面板接触时，对所述显示装置中与所述各向异性导电胶膜对应的区域进行曝光处理，包括：
在所述显示装置中的显示面板一侧进行曝光处理。
本发明一个实施例提供的上述各向异性导电胶膜、显示装置及其返修方法，该各向异性导电胶膜包括：具有正性感光特性的第一树脂层和分布在第一树脂层内的导电粒子；由于第一树脂层具有正性感光特性，因此，第一树脂层在曝光处理后可以被分解，这样，在利用各向异性导电胶膜绑定显示面板和外接电路出现不良时，可以采用对各向异性导电胶膜进行曝光处理的方式使各向异性导电胶膜中的第一树脂层分解，从而可以将外接电路与显示面板分离以实现对显示装置的返修，而无需采用加热的方式实现返修，这样，不仅可以简化返修过程，还能适用于对柔性显示面板进行返修。
附图说明
图1为本发明一个实施例提供的各向异性导电胶膜的结构示意图；
图2为本发明一个实施例提供的显示装置在绑定过程中进行热压处理前的结构示意图；
图3为本发明一个实施例提供的显示装置在绑定过程中进行热压处理后的结构示意图；
图4为本发明一个实施例提供的显示装置在曝光处理后的结构示意图；
图5为本发明一个实施例提供的显示装置的返修方法的流程图。
附图标记说明：
1、第一树脂层；2、导电粒子；3、第二树脂层；4、显示面板；5、外接电路；6、位于显示面板上的金属线；7、位于外接电路上的金属线；8空隙。
具体实施方式
下面结合附图，对本发明一个实施例提供的一种各向异性导电胶膜、显示装置及其返修方法的具体实施方式进行详细地说明。
附图中各膜层的形状和厚度不反映其真实比例，目的只是示意说明本发明内容。
本发明一个实施例提供的一种各向异性导电胶膜，如图1所示，至少包括：具有正性感光特性的第一树脂层1和分布在第一树脂层1内的导电粒子2。
本发明一个实施例提供的上述各向异性导电胶膜，由于第一树脂层具有正性感光特性，因此，第一树脂层在曝光处理后可以被分解，这样，在利用各向异性导电胶膜绑定显示面板和外接电路出现不良时，可以采用对各向异性导电胶膜进行曝光处理的方式使各向异性导电胶膜中的第一树脂层分解，从而可以将外接电路与显示面板分离以实现对显示装置的返修，而无需采用加热的方式实现返修，这样，不仅可以简化返修过程，还能适用于对柔性显示面板进行返修
需要说明的是，在本发明一个实施例提供的上述各向异性导电胶膜中，分布在第一树脂层内的导电粒子可以保证各向异性导电胶膜在绑定显示面板与外接电路时将显示面板与外接电路电性连接。
可选地，在本发明一个实施例提供的上述各向异性导电胶膜中，如图1所示，还可以包括：与第一树脂层1相贴合且不具有感光特性的第二树脂层3和分布在第二树脂层3内的导电粒子2。在各向异性导电胶膜中增加第二树脂层3可以增强各向异性导电胶膜的粘附力，在利用各向异性导电胶膜绑定显示面板与外接电路时，可以避免出现脱落的现象。
需要说明的是，在本发明一个实施例提供的上述各向异性导电胶膜中，分布在第一树脂层中的导电粒子和第二树脂层中的导电粒子可以保证各向异性导电胶膜在绑定显示面板与外接电路时将显示面板与外接电路电性连接。
优选地，在本发明一个实施例提供的上述各向异性导电胶膜中，由于在利用各向异性导电胶膜绑定显示面板和外接电路出现不良时，需要通过曝光处理使第一树脂层分解，以将外接电路与显示面板分离以实现对显示装置的返修，因此，为了保证第一树脂层能够曝光完全，以便于在曝光处理后将外接电路与显示面板分离，如图1所示，可以将第一树脂层1的厚度设置为小于第二树脂层3的厚度。
可选地，在本发明一个实施例提供的上述各向异性导电胶膜中，第一树脂层的材料可以为光敏树脂，即通过化学反应形成的含有感光基团的树脂材料；或者，也可以在第二树脂层的材料内掺入感光剂作为第一树脂层的材料，可选地，第二树脂层的材料可以为聚酰亚胺树脂(PI)或聚萘二甲酸乙二醇酯(PEN)等柔性基材，感光剂可以为重氮醌类化合物等，则第一树脂层的材料可以为掺有重氮醌类化合物的聚酰亚胺树脂、掺有重氮醌类化合物的聚萘二甲酸乙二醇酯中的一种或多种的组合，在此不做限定。
需要说明的是，在本发明一个实施例提供的上述各向异性导电胶膜中，由于第一树脂层中的感光剂或感光基团可以在对应波长的光的照射下发生反应，因此，为了避免第一树脂层在自然环境中分解而影响各向异性导电胶膜的性能，一般在第一树脂层中掺入对自然光不敏感的感光剂或生成对自然光不敏感的感光基团，例如，可以在第一树脂层中掺入对紫外光敏感的感光剂或生成对紫外光敏感的感光基团；或者，也可以在第一树脂层中掺入对红外光敏感的感光剂或生成对红外光敏感的感光基团，在此不做限定。
基于同一发明构思，本发明一个实施例还提供了一种显示装置，如图2和图3所示，包括：显示面板4(图2和图3仅示出显示面板的绑定区域)与外接电路5；其中，
显示面板4与外接电路5通过本发明一个实施例提供的上述各向异性导电胶膜电性连接。图2和图3均以各向异性导电胶膜包括第二树脂层3、第一树脂层1以及分布于第二树脂层3和第一树脂层1中的导电粒子2为例进行说明，其中，图2为绑定过程中进行热压处理前的显示装置，图3为绑定过程中进行热压后的显示装置。
本发明一个实施例提供的上述显示装置，由于绑定显示面板与外接电路的各向异性导电胶膜中含有具有正性感光特性的第一树脂层， 这样，在利用各向异性导电胶膜绑定显示面板和外接电路出现不良时，可以采用对各向异性导电胶膜进行曝光处理的方式使各向异性导电胶膜中的第一树脂层分解，从而可以将外接电路与显示面板分离以实现对显示装置的返修，而无需采用加热的方式实现返修，这样，不仅可以简化返修过程，还能适用于对柔性显示面板进行返修。
本发明一个实施例提供的上述显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述各向异性导电胶膜的实施例，重复之处不再赘述。
优选地，在本发明一个实施例提供的上述显示装置中，无论各向异性导电胶膜仅包括第一树脂层，还是各向异性导电胶膜包括第二树脂层和第一树脂层，由于显示面板的透光性比外接电路的透光性好，因此，如图2和图3所示，可以将各向异性导电胶膜中的第一树脂层1与显示面板4接触，如图4所示，在对各向异性导电胶膜进行曝光处理时在显示面板4一侧进行曝光处理(如图4所示的箭头所示)。
当然，各向异性导电胶膜中的第一树脂层也可以与外接电路接触，为了保证对第一树脂层的曝光效果，需要延长曝光处理的时间，在此不做限定。
可选地，在本发明一个实施例提供的上述显示装置中，外接电路可以为柔性印刷电路(Flexible Printed Circuit，FPC)；柔性印刷电路通过各向异性导电胶膜与显示面板电性连接；或者，外接电路也可以包括：印刷电路(Printed Circuit，PC)和覆晶薄膜(Chip On Film，COF)；其中，印刷电路通过各向异性导电胶膜与覆晶薄膜电性连接，覆晶薄膜通过各向异性导电胶膜与显示面板电性连接。
当然，在本发明一个实施例提供的上述显示装置中，外接电路并非局限于柔性印刷电路，也并非局限于印刷电路和覆晶薄膜，还可以为其他可以对显示面板加载驱动信号的电路，在此不做限定。
优选地，在本发明一个实施例提供的上述显示装置中，显示面板可以为柔性显示面板，即本发明一个实施例提供的上述各向异性导电胶膜尤其适用于柔性显示面板，在将柔性显示面板和外接电路绑定的过程中出现不良时，仅需通过曝光处理即可将外接电路与柔性显示面板分离以实现对柔性显示装置的返修，而无需采用加热的方式实现返 修，不会对柔性显示面板造成损坏。
基于同一发明构思，本发明一个实施例还提供了一种显示装置的返修方法，如图5所示，包括如下步骤：
S501、对显示装置中与各向异性导电胶膜对应的区域进行曝光处理，使各向异性导电胶膜中的第一树脂层分解；
S502、将通过各向异性导电胶膜电性连接的显示面板与外接电路进行分离。
本发明一个实施例提供的上述方法，由于仅通过对显示装置中与各向异性导电胶膜对应的区域进行曝光处理，即可将显示装置中的显示面板和外接电路分离，从而可以实现对显示装置的返修，无需采用加热的方式实现返修，从而不仅可以简化返修过程，还可以适用于对柔性显示面板进行返修。
需要说明的是，在本发明一个实施例提供的上述方法中，由于第一树脂层中的感光剂或感光基团可以在对应波长的光的照射下发生反应，因此，为了避免第一树脂层在自然环境中分解而影响各向异性导电胶膜的性能，一般在第一树脂层中掺入对自然光不敏感的感光剂或生成对自然光不敏感的感光基团，例如，可以在第一树脂层中掺入对紫外光敏感的感光剂或生成对紫外光敏感的感光基团，曝光处理采用紫外光照射即可；或者，也可以在第一树脂层中掺入对红外光敏感的感光剂或生成对红外光敏感的感光基团，曝光处理采用红外光照射即可，在此不做限定。
可选地，在执行本发明一个实施例提供的上述方法中的步骤S501，对显示装置中与各向异性导电胶膜对应的区域进行曝光处理时，例如，如图4所示，位于显示面板4上的金属线6和位于外接电路5上的金属线7之间的各向异性导电胶膜中的第一树脂层由于被位于显示面板4上的金属线6遮挡而不易被分解，因此，如图5所示，在执行本发明一个实施例提供的上述方法中的步骤S501，对显示装置中与各向异性导电胶膜对应的区域进行曝光处理之后，在执行本发明一个实施例提供的上述方法中的步骤S502，将显示装置中的显示面板与外接电路进行分离之前，还可以包括如下步骤：
S503、利用去除液对显示装置中与各向异性导电胶膜对应的区域进行处理；这样，可以将位于显示面板4上的金属线6和位于外接电 路5上的金属线7之间的各向异性导电胶膜去除掉，从而可以轻易地将外接电路5从显示面板4上取下。优选地，可以在显示装置中的边缘向空隙8(被曝光的第一树脂层分解后形成的)处注入去除液。当然，还可以利用各向异性导电胶膜通过其他方式对显示装置进行处理，在此不做限定。
可选地，在本发明一个实施例提供的上述方法中，去除液可以包括：酒精系溶剂、有机酸和非离子界面活性剂等。当然，去除液的成分并非局限于此，在此不做限定。
可选地，在执行本发明一个实施例提供的上述方法中的步骤S502，将显示面板与外接电路分离之后，在显示面板的绑定区域还残留有第一树脂层被分解后的残留物，因此，如图5所示，在执行执行本发明一个实施例提供的上述方法中的步骤S502，将显示面板与外接电路分离之后，还可以包括如下步骤：
S504、利用有机溶剂对显示面板进行处理；优选地，可以利用酒精轻轻擦拭显示面板的绑定区域，这样，可以为下一次绑定提供良好的条件。
可选地，在本发明一个实施例提供的上述方法中，由于显示面板的透光性比外接电路的透光性好，因此，可以将各向异性导电胶膜中的第一树脂层与显示装置中的显示面板接触，在执行本发明一个实施例提供的上述方法中的步骤S501对显示装置中与各向异性导电胶膜对应的区域进行曝光处理时，可以在显示装置中的显示面板一侧进行曝光处理，这样，可以保证第一树脂层的曝光效果良好。
当然，各向异性导电胶膜中的第一树脂层也可以与外接电路接触，为了保证第一树脂层的曝光效果，需要延长曝光处理的时间，在此不做限定。
本发明一个实施例提供的一种各向异性导电胶膜、显示装置及其返修方法，该各向异性导电胶膜包括：具有正性感光特性的第一树脂层和分布在第一树脂层内的导电粒子；由于第一树脂层具有正性感光特性，因此，第一树脂层在曝光处理后可以被分解，这样，在利用各向异性导电胶膜绑定显示面板和外接电路出现不良时，可以采用对各向异性导电胶膜进行曝光处理的方式使各向异性导电胶膜中的第一树脂层分解，从而可以将外接电路与显示面板分离以实现对显示装置的 返修，而无需采用加热的方式实现返修，这样，不仅可以简化返修过程，还能适用于对柔性显示面板进行返修。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (13)

  1. 一种各向异性导电胶膜，其特征在于，至少包括：具有正性感光特性的第一树脂层和分布在所述第一树脂层内的导电粒子。
  2. 如权利要求1所述的各向异性导电胶膜，其特征在于，还包括：与所述第一树脂层相贴合且不具有感光特性的第二树脂层和分布在所述第二树脂层内的导电粒子。
  3. 如权利要求2所述的各向异性导电胶膜，其特征在于，所述第一树脂层的厚度小于所述第二树脂层的厚度。
  4. 如权利要求1-3任一项所述的各向异性导电胶膜，其特征在于，所述第一树脂层的材料为光敏树脂、掺有重氮醌类化合物的聚酰亚胺树脂、掺有重氮醌类化合物的聚萘二甲酸乙二醇酯中一种或多种的组合。
  5. 一种显示装置，其特征在于，包括：显示面板与外接电路；其中，
    所述显示面板与所述外接电路通过如权利要求1-4任一项所述的各向异性导电胶膜电性连接。
  6. 如权利要求5所述的显示装置，其特征在于，所述各向异性导电胶膜中的第一树脂层与所述显示面板接触。
  7. 如权利要求5或6所述的显示装置，其特征在于，所述外接电路包括：柔性印刷电路；所述柔性印刷电路通过所述各向异性导电胶膜与所述显示面板电性连接；或者，
    外接电路包括：印刷电路和覆晶薄膜；其中，所述覆晶薄膜通过所述各向异性导电胶膜与所述显示面板电性连接。
  8. 如权利要求5或6所述的显示装置，其特征在于，所述显示面板为柔性显示面板。
  9. 一种如权利要求5-8任一项所述的显示装置的返修方法，其特征在于，包括：
    对显示装置中与各向异性导电胶膜对应的区域进行曝光处理，使所述各向异性导电胶膜中的第一树脂层分解；
    将通过所述各向异性导电胶膜电性连接的显示面板与外接电路进行分离。
  10. 如权利要求9所述的方法，其特征在于，在曝光处理之后，在将显示面板与外接电路分离之前，还包括：
    利用去除液对所述显示装置中与所述各向异性导电胶膜对应的区域进行处理。
  11. 如权利要求10所述的方法，其特征在于，所述去除液包括：酒精系溶剂、有机酸和非离子界面活性剂。
  12. 如权利要求9-11任一项所述的方法，其特征在于，在将显示面板与外接电路分离之后，还包括：
    利用有机溶剂对所述显示面板进行处理。
  13. 如权利要求9-11任一项所述的方法，其特征在于，在所述各向异性导电胶膜中的第一树脂层与所述显示装置中的显示面板接触时，对所述显示装置中与所述各向异性导电胶膜对应的区域进行曝光处理，包括：
    在所述显示装置中的显示面板一侧进行曝光处理。
PCT/CN2015/085428 2015-04-07 2015-07-29 一种各向异性导电胶膜、显示装置及其返修方法 WO2016161719A1 (zh)

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