WO2019080736A1 - Method of bonding integrated circuit chip to display panel, and display apparatus - Google Patents

Method of bonding integrated circuit chip to display panel, and display apparatus

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Publication number
WO2019080736A1
WO2019080736A1 PCT/CN2018/110229 CN2018110229W WO2019080736A1 WO 2019080736 A1 WO2019080736 A1 WO 2019080736A1 CN 2018110229 W CN2018110229 W CN 2018110229W WO 2019080736 A1 WO2019080736 A1 WO 2019080736A1
Authority
WO
WIPO (PCT)
Prior art keywords
display panel
vias
bonding pads
forming
integrated circuit
Prior art date
Application number
PCT/CN2018/110229
Other languages
French (fr)
Inventor
Hongwei Ma
Youngyik Ko
Tairong KIM
Xiangdan DONG
Jinsan PARK
Original Assignee
Boe Technology Group Co., Ltd.
Chengdu Boe Optoelectronics Technology Co., Ltd.
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 Boe Technology Group Co., Ltd., Chengdu Boe Optoelectronics Technology Co., Ltd. filed Critical Boe Technology Group Co., Ltd.
Priority to US16/332,291 priority Critical patent/US11367698B2/en
Priority to EP18852765.9A priority patent/EP3701775A4/en
Publication of WO2019080736A1 publication Critical patent/WO2019080736A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/02—Bonding areas ; Manufacturing methods related thereto
    • 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
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L24/02—Bonding areas ; Manufacturing methods related thereto
    • H01L24/07—Structure, shape, material or disposition of the bonding areas after the connecting process
    • H01L24/08—Structure, shape, material or disposition of the bonding areas after the connecting process of an individual bonding area
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/065—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L27/00
    • H01L25/0657—Stacked arrangements of devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/18—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different subgroups of the same main group of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/50—Multistep manufacturing processes of assemblies consisting of devices, each device being of a type provided for in group H01L27/00 or H01L29/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/023—Redistribution layers [RDL] for bonding areas
    • H01L2224/0231—Manufacturing methods of the redistribution layers
    • H01L2224/02311—Additive methods
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/023—Redistribution layers [RDL] for bonding areas
    • H01L2224/0237—Disposition of the redistribution layers
    • H01L2224/02371—Disposition of the redistribution layers connecting the bonding area on a surface of the semiconductor or solid-state body with another surface of the semiconductor or solid-state body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/023—Redistribution layers [RDL] for bonding areas
    • H01L2224/0237—Disposition of the redistribution layers
    • H01L2224/02372—Disposition of the redistribution layers connecting to a via connection in the semiconductor or solid-state body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/023—Redistribution layers [RDL] for bonding areas
    • H01L2224/0237—Disposition of the redistribution layers
    • H01L2224/02381—Side view
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/02—Bonding areas; Manufacturing methods related thereto
    • H01L2224/07—Structure, shape, material or disposition of the bonding areas after the connecting process
    • H01L2224/08—Structure, shape, material or disposition of the bonding areas after the connecting process of an individual bonding area
    • H01L2224/081—Disposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2225/00—Details relating to assemblies covered by the group H01L25/00 but not provided for in its subgroups
    • H01L2225/03—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00
    • H01L2225/04—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers
    • H01L2225/065—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers the devices being of a type provided for in group H01L27/00
    • H01L2225/06503—Stacked arrangements of devices
    • H01L2225/06541—Conductive via connections through the device, e.g. vertical interconnects, through silicon via [TSV]
    • H01L2225/06544—Design considerations for via connections, e.g. geometry or layout
    • 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
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/111—Pads for surface mounting, e.g. lay-out
    • H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
    • 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
    • H05K2201/09—Shape and layout
    • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
    • H05K2201/09972—Partitioned, e.g. portions of a PCB dedicated to different functions; Boundary lines therefore; Portions of a PCB being processed separately or differently
    • 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
    • H05K2201/10007—Types of components
    • H05K2201/10128—Display
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to display technology, more particularly, to a method of bonding an integrated circuit chip to a display panel, and a display apparatus.
  • the present invention provides a method of bonding an integrated circuit chip to a display panel, comprising forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming a plurality of vias extending through the display panel in the bonding region; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a second side of the display panel substantially opposite to the first side, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias.
  • the one or more of the plurality of vias extends through one of the plurality of first bonding pads.
  • the one or more of the plurality of vias directly abut an edge of one of the plurality of first bonding pads.
  • the method further comprises, prior to forming the plurality of vias, forming an optical film on a second side of the display panel substantially opposite to the first side; and wherein the plurality of vias are formed to extend through the display panel and the optical film in the bonding region.
  • the method further comprises subsequent to forming the optical film, forming a protective film on a side of the optical film distal to the display panel; and subsequent to forming the plurality of vias, removing the protective film from the optical film.
  • one or more of the plurality of vias extend through the display panel and the optical film in the bonding region, and at least partially extend into the protective film.
  • an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel, thereby forming an overlapping region.
  • each of the plurality of vias are formed at least partially in the overlapping region.
  • each of the plurality of vias are formed at least partially in the overlapping region, and adjacent to an edge of the overlapping region.
  • each of the plurality of vias are formed at least partially in the overlapping region, and directly abutting an edge of the overlapping region.
  • each of the plurality of vias are formed outside the overlapping region, and directly abutting an edge of the overlapping region.
  • forming the plurality of vias are performed by laser perforation.
  • forming the plurality of connectors respectively in the plurality of vias are performed by sputtering a conductive material in the the plurality of vias.
  • an orifice of at least one of the plurality of vias on the first side is surrounded by one of the plurality of first bonding pads.
  • an orifice of one of the plurality of vias on the first side directly abuts one of the plurality of first bonding pads.
  • the integrated circuit chip is a chip-on-film.
  • the present invention provides a display apparatus comprising a display panel and an integrated circuit chip bonded to the display panel according to a method described herein.
  • the display apparatus is a flexible display apparatus.
  • the integrated circuit chip is a chip-on-film.
  • FIG. 1 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • FIG. 2 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • FIG. 3 is a schematic diagram illustrating the structure of a display panel in some embodiments according to the present disclosure.
  • FIG. 4 is a plan view of the display panel in FIG. 3.
  • FIG. 5 illustrates a process of forming an optical film on a display panel in some embodiments according to the present disclosure.
  • FIG. 6A illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • FIG. 6B illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • FIG. 6C illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • FIG. 7 illustrates a process of removing a protective film from a display panel in some embodiments according to the present disclosure.
  • FIG. 8 is a schematic diagram illustrating the structure of an integrated circuit chip in some embodiments according to the present disclosure.
  • FIG. 9 is a plan view of the integrated circuit chip in FIG. 8.
  • FIG. 10 illustrates a process of attaching an integrated circuit chip in a bonding region of a display panel in some embodiments according to the present disclosure.
  • FIG. 11A illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • FIG. 11B illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • FIG. 11C illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • the present disclosure provides, inter alia, a method of bonding an integrated circuit chip to a display panel, and a display apparatus that substantially obviate one or more of the problems due to limitations and disadvantages of the related art.
  • the present disclosure provides a method of bonding an integrated circuit chip to a display panel having a display region and a bonding region.
  • FIG. 1 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. Referring to FIG.
  • the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming a plurality of vias extending through the display panel in the bonding region, each of the plurality of vias extending through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a second side of the display panel substantially opposite to the first side, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the display panel, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias.
  • the term “display region” refers to a region of the display panel where image is actually displayed.
  • the display region may include both a subpixel region and an inter-subpixel region.
  • Asubpixel region refers to a light emission region of a subpixel, such as a region corresponding to a pixel electrode in a liquid crystal display or a region corresponding to a light emissive layer in an organic light emitting display.
  • An inter-subpixel region refers to a region between adjacent subpixel regions, such as a region corresponding to a black matrix in a liquid crystal display or a region corresponding a pixel definition layer in an organic light emitting display.
  • the inter-subpixel region is a region between adjacent subpixel regions in a same pixel.
  • the inter-subpixel region is a region between two adjacent subpixel regions from two adjacent pixels.
  • the term “bonding region” refers to a region of the display panel wherein a plurality of signal lines are connected to an integrated circuit ship.
  • the bonding region of the display panel includes a plurality of bonding pads.
  • substantially opposite means that two sides (e.g., a first side and a second side) need not be arranged exactly in parallel, but may be arranged in such a manner that an inclination between the two sides is defined, e.g., with an inclined angle less than 45 degrees, 30 degrees, 15 degrees, or 10 degrees.
  • the plurality of vias are first formed in a plurality of pre-designated positions prior to disposing the integrated circuit chip on the second side of the display panel, followed by forming the plurality of connectors respectively in the plurality of vias respectively electrically connecting the plurality of first bonding pads and the plurality of second bonding pads. Because the plurality of vias are formed prior to placing the integrated circuit chip on the display panel, obviating any damage to the integrated circuit chip caused by the via-forming process (e.g., using laser to form the plurality of vias) .
  • FIG. 2 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming an optical film and a protective film on a second side of the display panel substantially opposite to the first side, the protective film on a side of the optical film distal to the display panel; forming a plurality of vias extending through the display panel and the optical film in the bonding region, each of the plurality of vias extending through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, removing the protective film from the optical film; subsequent to removing the protective film, disposing an integrated circuit chip having a plurality of second bonding pads on a side of the optical film distal to the display panel, the plurality of second bonding pads being on
  • one or more of the plurality of vias not only extend through the display panel and the optical film in the bonding region, but also at least partially extend into the protective film.
  • the plurality of vias extend through the display panel, the optical film, and the protective film in the bonding region.
  • each of the plurality of vias extend through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads.
  • an orifice of one of the plurality of vias on the first side is surrounded by one of the plurality of first bonding pads.
  • an orifice of one of the plurality of vias on the first side directly abuts one of the plurality of first bonding pads.
  • the protective film is required.
  • the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming an optical film on a second side of the display panel substantially opposite to the first side; forming a plurality of vias extending through the display panel in the bonding region and the optical film, each of the plurality of vias extending through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a side of the optical film distal to the display panel, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the optical film, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel; and electrically connecting the plurality
  • FIG. 3 is a schematic diagram illustrating the structure of a display panel in some embodiments according to the present disclosure.
  • FIG. 4 is a plan view of the display panel in FIG. 3.
  • the display panel 1 has a display region and a bonding region. In the bonding region, the display panel 1 includes a plurality of first bonding pads 2.
  • the display panel has a first side S1 and a second side S2 substantially opposite to the first side S1.
  • the plurality of bonding pads are on the first side S1.
  • the first side S1 is a light emitting side of the display panel 1
  • the second side S2 is a light non-emitting side of the display panel 1.
  • FIG. 5 illustrates a process of forming an optical film on a display panel in some embodiments according to the present disclosure.
  • an optical film 3 and a protective film 4 are formed on the second side S2 of the display panel 1.
  • the protective film 4 is formed on a side of the optical film 3 distal to the display panel 1.
  • the optical film 3 is in direct contact with the display panel 1, and the protective film 4 is in direction contact with the optical film 3.
  • the optical film 3 is attached to the display panel by an optically adhesive film.
  • the optical film 3 extends throughout the display panel 1.
  • the protective film 4 extends throughout the display panel 1.
  • the protective film 4 is limited to the bonding region of the display panel 1.
  • the protective film 4 is omitted entirely, i.e., only the optical film 3 is disposed on the second side S2 of the display panel 1.
  • FIG. 6A illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • the plurality of vias 5 respectively extend through the plurality of first bonding pads 2.
  • Each of the pre-designated positions for forming the plurality of vias 5 is adjacent to an edge of one of the plurality of first bonding pads 2.
  • the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6A.
  • the plurality of vias 5 do not extend into the protective film 4.
  • the plurality of vias 5 at least partially extend into the protective film 4.
  • FIG. 6B illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • each of the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2.
  • the step of forming the plurality of vias 5 includes removing a portion of each of the plurality of first bonding pads 2 at its edge.
  • Each of the pre-designated positions for forming the plurality of vias 5 is at an edge of one of the plurality of first bonding pads 2.
  • the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6B.
  • the plurality of vias 5 do not extend into the protective film 4.
  • the plurality of vias 5 at least partially extend into the protective film 4.
  • FIG. 6C illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
  • each of the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2.
  • the step of forming the plurality of vias 5 does not involve removing any portion of the plurality of first bonding pads 2.
  • Each of the pre-designated positions for forming the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2.
  • the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6C.
  • the plurality of vias 5 do not extend into the protective film 4.
  • the plurality of vias 5 at least partially extend into the protective film 4.
  • the step of forming the plurality of vias 5 is performed by laser perforation.
  • FIG. 7 illustrates a process of removing a protective film from a display panel in some embodiments according to the present disclosure. Referring to FIG. 7, subsequent to forming the plurality of vias, the protective film 4 is removed from the surface of the optical film 3.
  • FIG. 8 is a schematic diagram illustrating the structure of an integrated circuit chip in some embodiments according to the present disclosure.
  • FIG. 9 is a plan view of the integrated circuit chip in FIG. 8.
  • the integrated circuit chip 7 includes a plurality of second bonding pads 8.
  • the plurality of second bonding pads 8 are on one side of the integrated circuit chip 7.
  • FIG. 10 illustrates a process of attaching an integrated circuit chip in a bonding region of a display panel in some embodiments according to the present disclosure.
  • the integrated circuit chip 7 having a plurality of second bonding pads 8 is disposed on the second side S2 of the display panel 1.
  • the integrated circuit chip 7 is placed on the display panel 1 in a way so that the plurality of second bonding pads 8 are on a side of the optical film 3 distal to the display panel 1, e.g., the plurality of second bonding pads 8 are on a side of the integrated circuit chip 7 proximal to the optical film 3.
  • an orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1.
  • the plurality of first bonding pads 2 and the plurality of second bonding pads 8 have a one-to-one corresponding relationship.
  • the plurality of second bonding pads 8 are in direct contact with the optical film 3.
  • the method further includes, subsequent to disposing the integrated circuit chip 7 having a plurality of second bonding pads 8 on the second side S2 of the display panel, aligning the plurality of first bonding pads 2 and the plurality of second bonding pads 8 with each other so that the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 at least partially overlaps with the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1.
  • the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 substantially overlaps with the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1.
  • the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 substantially covers the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1.
  • the orthographic projection of each of the plurality of second bonding pads 8 on the display panel 1 substantially covers the orthographic projection of one of the plurality of first bonding pads 2 on the display panel 1.
  • each of the pre-designated positions for forming the plurality of vias 5 is at least partially in the overlapping region.
  • each of the pre-designated positions for forming the plurality of vias 5 is in the overlapping region, and adjacent to an edge of the overlapping region.
  • one or more of the pre-designated positions for forming the plurality of vias 5 is entirely in the overlapping region (see, e.g., FIG. 6A) .
  • each of the pre-designated positions for forming the plurality of vias 5 is in the overlapping region, and directly abuts an edge of the overlapping region (see, e.g., FIG. 6B) .
  • each of the pre-designated positions for forming the plurality of vias 5 is outside the overlapping region, and directly abuts an edge of the overlapping region (see, e.g., FIG. 6C) .
  • FIG. 11A illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • the structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6A.
  • FIG. 11B illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • the structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6B.
  • FIG. 11C illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
  • the structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6C.
  • a plurality of connectors 9 are formed respectively in the plurality of vias. Each of the plurality of connectors 9 electrically connects one of the plurality of first bonding pads 2 and one of the plurality of second bonding pads 8.
  • the step of forming the plurality of connectors 9 respectively in the plurality of vias includes sputtering a conductive material in the plurality of vias, thereby forming the plurality of connectors 9 respectively electrically connecting the plurality of first bonding pads 2 and the plurality of second bonding pads 8.
  • the step of forming the plurality of connectors 9 respectively in the plurality of vias includes depositing a conductive material layer following by patterning the conductive material layer to form the plurality of connectors 9.
  • the step of patterning the conductive material layer in some embodiments includes forming a photoresist layer, exposing the photoresist layer with a mask plate, developing the exposed photoresist layer thereby forming a photoresist pattern, etching the conductive material layer in regions exposed by the photoresist pattern, and removing the photoresist layer, thereby forming the plurality of connectors 9 in the plurality of vias.
  • the plurality of connectors 9 include a metallic material such as a metal or an alloy.
  • the metallic material is aluminum.
  • the plurality of first bonding pads 2 and the plurality of second bonding pads 8 include a conductive material such as a metal.
  • the plurality of vias are first formed in a plurality of pre-designated positions prior to disposing the integrated circuit chip on the second side of the display panel, followed by forming the plurality of connectors respectively in the plurality of vias respectively electrically connecting the plurality of first bonding pads and the plurality of second bonding pads. Because the plurality of vias are formed prior to placing the integrated circuit chip on the display panel, obviating any damage to the integrated circuit chip caused by the via-forming process (e.g., using laser to form the plurality of vias) .
  • the present disclosure provides a display apparatus having a display panel and an integrated circuit chip, wherein the integrated circuit chip is bonded to the display panel by a method described herein.
  • the display panel is a flexible display panel
  • the display apparatus is a flexible display apparatus.
  • the display apparatus is a display apparatus with a narrow bezel or an extremely narrow bezel.
  • the display apparatus is a liquid crystal display apparatus.
  • the display apparatus is an organic light emitting diode display apparatus.
  • the display apparatus is an electrophoretic display apparatus. Examples of touch display apparatuses include, but are not limited to, an electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital album, a GPS, etc.
  • the term “the invention” , “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred.
  • the invention is limited only by the spirit and scope of the appended claims.
  • these claims may refer to use “first” , “second” , etc. following with noun or element.
  • Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. Any advantages and benefits described may not apply to all embodiments of the invention.

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Abstract

A method of bonding an integrated circuit chip (7) to a display panel (1) is provided. The method includes forming a plurality of first bonding pads (2) in a bonding region on a first side of the display panel (1); forming a plurality of vias (5) extending through the display panel (1) in the bonding region; subsequent to forming the plurality of vias (5), disposing an integrated circuit chip (7) having a plurality of second bonding pads (8) on a second side of the display panel (1) substantially opposite to the first side, the plurality of second bonding pads (8) being on a side of the integrated circuit chip (7) proximal to the display panel (1); and electrically connecting the plurality of first bonding pads (2) respectively with the plurality of second bonding pads (8) by forming a plurality of connectors (9) respectively in the plurality of vias (5).

Description

METHOD OF BONDING INTEGRATED CIRCUIT CHIP TO DISPLAY PANEL, AND DISPLAY APPARATUS
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to Chinese Patent Application No. 201711057011.3, filed October 27, 2017, the contents of which are incorporated by reference in the entirety.
TECHNICAL FIELD
The present invention relates to display technology, more particularly, to a method of bonding an integrated circuit chip to a display panel, and a display apparatus.
BACKGROUND
In recent years, flexible display apparatuses have been developed. In particular, flexible organic light emitting diode display apparatuses have been widely used in various applications. To achieve better user experience and display quality, a narrow bezel design of display apparatuses has become a focus of research and development.
SUMMARY
In one aspect, the present invention provides a method of bonding an integrated circuit chip to a display panel, comprising forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming a plurality of vias extending through the display panel in the bonding region; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a second side of the display panel substantially opposite to the first side, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias.
Optionally, the one or more of the plurality of vias extends through one of the plurality of first bonding pads.
Optionally, the one or more of the plurality of vias directly abut an edge of one of the plurality of first bonding pads.
Optionally, the method further comprises, prior to forming the plurality of vias, forming an optical film on a second side of the display panel substantially opposite to the first side; and wherein the plurality of vias are formed to extend through the display panel and the optical film in the bonding region.
Optionally, the method further comprises subsequent to forming the optical film, forming a protective film on a side of the optical film distal to the display panel; and subsequent to forming the plurality of vias, removing the protective film from the optical film.
Optionally, one or more of the plurality of vias extend through the display panel and the optical film in the bonding region, and at least partially extend into the protective film.
Optionally, prior to forming the plurality of vias, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel, thereby forming an overlapping region.
Optionally, each of the plurality of vias are formed at least partially in the overlapping region.
Optionally, each of the plurality of vias are formed at least partially in the overlapping region, and adjacent to an edge of the overlapping region.
Optionally, each of the plurality of vias are formed at least partially in the overlapping region, and directly abutting an edge of the overlapping region.
Optionally, each of the plurality of vias are formed outside the overlapping region, and directly abutting an edge of the overlapping region.
Optionally, forming the plurality of vias are performed by laser perforation.
Optionally, forming the plurality of connectors respectively in the plurality of vias are performed by sputtering a conductive material in the the plurality of vias.
Optionally, subsequent to disposing the integrated circuit chip having the plurality of second bonding pads on the second side of the display panel, further comprising aligning the plurality of first bonding pads and the plurality of second bonding pads with each other so that an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel.
Optionally, an orifice of at least one of the plurality of vias on the first side is surrounded by one of the plurality of first bonding pads.
Optionally, an orifice of one of the plurality of vias on the first side directly abuts one of the plurality of first bonding pads.
Optionally, the integrated circuit chip is a chip-on-film.
In another aspect, the present invention provides a display apparatus comprising a display panel and an integrated circuit chip bonded to the display panel according to a method described herein.
Optionally, the display apparatus is a flexible display apparatus.
Optionally, the integrated circuit chip is a chip-on-film.
BRIEF DESCRIPTION OF THE FIGURES
The following drawings are merely examples for illustrative purposes according to various disclosed embodiments and are not intended to limit the scope of the present invention.
FIG. 1 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
FIG. 2 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
FIG. 3 is a schematic diagram illustrating the structure of a display panel in some embodiments according to the present disclosure.
FIG. 4 is a plan view of the display panel in FIG. 3.
FIG. 5 illustrates a process of forming an optical film on a display panel in some embodiments according to the present disclosure.
FIG. 6A illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
FIG. 6B illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
FIG. 6C illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure.
FIG. 7 illustrates a process of removing a protective film from a display panel in some embodiments according to the present disclosure.
FIG. 8 is a schematic diagram illustrating the structure of an integrated circuit chip in some embodiments according to the present disclosure.
FIG. 9 is a plan view of the integrated circuit chip in FIG. 8.
FIG. 10 illustrates a process of attaching an integrated circuit chip in a bonding region of a display panel in some embodiments according to the present disclosure.
FIG. 11A illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
FIG. 11B illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
FIG. 11C illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure.
DETAILED DESCRIPTION
The disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of some embodiments are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
The present disclosure provides, inter alia, a method of bonding an integrated circuit chip to a display panel, and a display apparatus that substantially obviate one or more of the problems due to limitations and disadvantages of the related art. In one aspect, the present disclosure provides a method of bonding an integrated circuit chip to a display panel having a display region and a bonding region. FIG. 1 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. Referring to FIG. 1, the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming a plurality of vias extending through the display panel in the bonding region, each of the plurality of vias extending through one of the plurality of first bonding pads or directly  abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a second side of the display panel substantially opposite to the first side, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the display panel, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias. Optionally, the integrated circuit chip is a chip-on-film.
As used herein, the term “display region” refers to a region of the display panel where image is actually displayed. Optionally, the display region may include both a subpixel region and an inter-subpixel region. Asubpixel region refers to a light emission region of a subpixel, such as a region corresponding to a pixel electrode in a liquid crystal display or a region corresponding to a light emissive layer in an organic light emitting display. An inter-subpixel region refers to a region between adjacent subpixel regions, such as a region corresponding to a black matrix in a liquid crystal display or a region corresponding a pixel definition layer in an organic light emitting display. Optionally, the inter-subpixel region is a region between adjacent subpixel regions in a same pixel. Optionally, the inter-subpixel region is a region between two adjacent subpixel regions from two adjacent pixels. As used herein, the term “bonding region” refers to a region of the display panel wherein a plurality of signal lines are connected to an integrated circuit ship. Optionally, the bonding region of the display panel includes a plurality of bonding pads. As used herein, the term “substantially opposite” means that two sides (e.g., a first side and a second side) need not be arranged exactly in parallel, but may be arranged in such a manner that an inclination between the two sides is defined, e.g., with an inclined angle less than 45 degrees, 30 degrees, 15 degrees, or 10 degrees.
In the present method, the plurality of vias are first formed in a plurality of pre-designated positions prior to disposing the integrated circuit chip on the second side of the display panel, followed by forming the plurality of connectors respectively in the plurality of vias respectively electrically connecting the plurality of first bonding pads and the plurality of second bonding pads. Because the plurality of vias are formed prior to placing the integrated  circuit chip on the display panel, obviating any damage to the integrated circuit chip caused by the via-forming process (e.g., using laser to form the plurality of vias) .
FIG. 2 is a flow chart illustrating a method of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. Referring to FIG. 2, the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on a first side of the display panel; forming an optical film and a protective film on a second side of the display panel substantially opposite to the first side, the protective film on a side of the optical film distal to the display panel; forming a plurality of vias extending through the display panel and the optical film in the bonding region, each of the plurality of vias extending through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, removing the protective film from the optical film; subsequent to removing the protective film, disposing an integrated circuit chip having a plurality of second bonding pads on a side of the optical film distal to the display panel, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the optical film, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias. Optionally, the plurality of vias are formed by laser perforation.
Optionally, one or more of the plurality of vias not only extend through the display panel and the optical film in the bonding region, but also at least partially extend into the protective film. Optionally, the plurality of vias extend through the display panel, the optical film, and the protective film in the bonding region.
In some embodiments, each of the plurality of vias extend through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads. Optionally, an orifice of one of the plurality of vias on the first side is surrounded by one of the plurality of first bonding pads. Optionally, an orifice of one of the plurality of vias on the first side directly abuts one of the plurality of first bonding pads.
In some embodiment, the protective film is required. Optionally, the method in some embodiments includes forming a plurality of first bonding pads in a bonding region on  a first side of the display panel; forming an optical film on a second side of the display panel substantially opposite to the first side; forming a plurality of vias extending through the display panel in the bonding region and the optical film, each of the plurality of vias extending through one of the plurality of first bonding pads or directly abutting an edge of one of the plurality of first bonding pads; subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a side of the optical film distal to the display panel, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the optical film, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel; and electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias.
FIG. 3 is a schematic diagram illustrating the structure of a display panel in some embodiments according to the present disclosure. FIG. 4 is a plan view of the display panel in FIG. 3. Referring to FIG. 3 and FIG. 4, the display panel 1 has a display region and a bonding region. In the bonding region, the display panel 1 includes a plurality of first bonding pads 2. The display panel has a first side S1 and a second side S2 substantially opposite to the first side S1. The plurality of bonding pads are on the first side S1. Optionally, the first side S1 is a light emitting side of the display panel 1, whereas the second side S2 is a light non-emitting side of the display panel 1.
FIG. 5 illustrates a process of forming an optical film on a display panel in some embodiments according to the present disclosure. Referring to FIG. 5, an optical film 3 and a protective film 4 are formed on the second side S2 of the display panel 1. The protective film 4 is formed on a side of the optical film 3 distal to the display panel 1. Optionally, the optical film 3 is in direct contact with the display panel 1, and the protective film 4 is in direction contact with the optical film 3. Optionally, the optical film 3 is attached to the display panel by an optically adhesive film.
Optionally, the optical film 3 extends throughout the display panel 1. Optionally, the protective film 4 extends throughout the display panel 1. Optionally, the protective film 4 is limited to the bonding region of the display panel 1. Optionally, the protective film 4 is  omitted entirely, i.e., only the optical film 3 is disposed on the second side S2 of the display panel 1.
FIG. 6A illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure. Referring to FIG. 6A, the plurality of vias 5 respectively extend through the plurality of first bonding pads 2. Each of the pre-designated positions for forming the plurality of vias 5 is adjacent to an edge of one of the plurality of first bonding pads 2. Optionally, the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6A. Optionally, the plurality of vias 5 do not extend into the protective film 4. Optionally, the plurality of vias 5 at least partially extend into the protective film 4.
FIG. 6B illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure. Referring to FIG. 6B, each of the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2. The step of forming the plurality of vias 5 includes removing a portion of each of the plurality of first bonding pads 2 at its edge. Each of the pre-designated positions for forming the plurality of vias 5 is at an edge of one of the plurality of first bonding pads 2. Optionally, the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6B. Optionally, the plurality of vias 5 do not extend into the protective film 4. Optionally, the plurality of vias 5 at least partially extend into the protective film 4.
FIG. 6C illustrates a process of forming a plurality of vias in a bonding region of a display panel in some embodiments according to the present disclosure. Referring to FIG. 6C, each of the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2. The step of forming the plurality of vias 5 does not involve removing any portion of the plurality of first bonding pads 2. Each of the pre-designated positions for forming the plurality of vias 5 is directly abutting an edge of one of the plurality of first bonding pads 2. Optionally, the plurality of vias 5 extend through an entire thickness of the display panel 1 and the optical film 3, as shown in FIG. 6C. Optionally, the plurality of vias 5 do not extend into the protective film 4. Optionally, the plurality of vias 5 at least partially extend into the protective film 4.
Optionally, the step of forming the plurality of vias 5 is performed by laser perforation.
FIG. 7 illustrates a process of removing a protective film from a display panel in some embodiments according to the present disclosure. Referring to FIG. 7, subsequent to forming the plurality of vias, the protective film 4 is removed from the surface of the optical film 3.
FIG. 8 is a schematic diagram illustrating the structure of an integrated circuit chip in some embodiments according to the present disclosure. FIG. 9 is a plan view of the integrated circuit chip in FIG. 8. Referring to FIG. 8 and FIG. 9, the integrated circuit chip 7 includes a plurality of second bonding pads 8. Optionally, the plurality of second bonding pads 8 are on one side of the integrated circuit chip 7.
FIG. 10 illustrates a process of attaching an integrated circuit chip in a bonding region of a display panel in some embodiments according to the present disclosure. Referring to FIG. 10, subsequent to removing the protective film, the integrated circuit chip 7 having a plurality of second bonding pads 8 is disposed on the second side S2 of the display panel 1. Specifically, the integrated circuit chip 7 is placed on the display panel 1 in a way so that the plurality of second bonding pads 8 are on a side of the optical film 3 distal to the display panel 1, e.g., the plurality of second bonding pads 8 are on a side of the integrated circuit chip 7 proximal to the optical film 3. Optionally, an orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1. Optionally, the plurality of first bonding pads 2 and the plurality of second bonding pads 8 have a one-to-one corresponding relationship. Optionally, the plurality of second bonding pads 8 are in direct contact with the optical film 3.
Optionally, the method further includes, subsequent to disposing the integrated circuit chip 7 having a plurality of second bonding pads 8 on the second side S2 of the display panel, aligning the plurality of first bonding pads 2 and the plurality of second bonding pads 8 with each other so that the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 at least partially overlaps with the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1. Optionally, the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 substantially overlaps with the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1. Optionally, the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 substantially covers the  orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1. Optionally, the orthographic projection of each of the plurality of second bonding pads 8 on the display panel 1 substantially covers the orthographic projection of one of the plurality of first bonding pads 2 on the display panel 1.
In some embodiments, the orthographic projection of each of the plurality of first bonding pads 2 on the display panel 1 at least partially overlaps with the orthographic projection of one of the plurality of second bonding pads 8 on the display panel 1, thereby forming an overlapping region. Optionally, each of the pre-designated positions for forming the plurality of vias 5 is at least partially in the overlapping region. Optionally, each of the pre-designated positions for forming the plurality of vias 5 is in the overlapping region, and adjacent to an edge of the overlapping region. Optionally, one or more of the pre-designated positions for forming the plurality of vias 5 is entirely in the overlapping region (see, e.g., FIG. 6A) . Optionally, each of the pre-designated positions for forming the plurality of vias 5 is in the overlapping region, and directly abuts an edge of the overlapping region (see, e.g., FIG. 6B) . Optionally, each of the pre-designated positions for forming the plurality of vias 5 is outside the overlapping region, and directly abuts an edge of the overlapping region (see, e.g., FIG. 6C) .
FIG. 11A illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. The structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6A. FIG. 11B illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. The structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6B. FIG. 11C illustrates a process of bonding an integrated circuit chip to a display panel in some embodiments according to the present disclosure. The structure of the assembly of the integrated circuit chip and the display panel corresponds to that in FIG. 6C. Referring to FIGs. 11A to 11C, a plurality of connectors 9 are formed respectively in the plurality of vias. Each of the plurality of connectors 9 electrically connects one of the plurality of first bonding pads 2 and one of the plurality of second bonding pads 8.
In some embodiments, the step of forming the plurality of connectors 9 respectively in the plurality of vias includes sputtering a conductive material in the plurality of vias,  thereby forming the plurality of connectors 9 respectively electrically connecting the plurality of first bonding pads 2 and the plurality of second bonding pads 8.
In some embodiments, the step of forming the plurality of connectors 9 respectively in the plurality of vias includes depositing a conductive material layer following by patterning the conductive material layer to form the plurality of connectors 9. Specifically, the step of patterning the conductive material layer in some embodiments includes forming a photoresist layer, exposing the photoresist layer with a mask plate, developing the exposed photoresist layer thereby forming a photoresist pattern, etching the conductive material layer in regions exposed by the photoresist pattern, and removing the photoresist layer, thereby forming the plurality of connectors 9 in the plurality of vias.
Optionally, the plurality of connectors 9 include a metallic material such as a metal or an alloy. Optionally, the metallic material is aluminum.
The plurality of first bonding pads 2 and the plurality of second bonding pads 8 include a conductive material such as a metal.
In the present method, the plurality of vias are first formed in a plurality of pre-designated positions prior to disposing the integrated circuit chip on the second side of the display panel, followed by forming the plurality of connectors respectively in the plurality of vias respectively electrically connecting the plurality of first bonding pads and the plurality of second bonding pads. Because the plurality of vias are formed prior to placing the integrated circuit chip on the display panel, obviating any damage to the integrated circuit chip caused by the via-forming process (e.g., using laser to form the plurality of vias) .
In another aspect, the present disclosure provides a display apparatus having a display panel and an integrated circuit chip, wherein the integrated circuit chip is bonded to the display panel by a method described herein. Optionally, the display panel is a flexible display panel, and the display apparatus is a flexible display apparatus. Optionally, the display apparatus is a display apparatus with a narrow bezel or an extremely narrow bezel. Optionally, the display apparatus is a liquid crystal display apparatus. Optionally, the display apparatus is an organic light emitting diode display apparatus. Optionally, the display apparatus is an electrophoretic display apparatus. Examples of touch display apparatuses include, but are not limited to, an electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital album, a GPS, etc.
The foregoing description of the embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention” , “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first” , “second” , etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.

Claims (20)

  1. A method of bonding an integrated circuit chip to a display panel, comprising:
    forming a plurality of first bonding pads in a bonding region on a first side of the display panel;
    forming a plurality of vias extending through the display panel in the bonding region;
    subsequent to forming the plurality of vias, disposing an integrated circuit chip having a plurality of second bonding pads on a second side of the display panel substantially opposite to the first side, the plurality of second bonding pads being on a side of the integrated circuit chip proximal to the display panel; and
    electrically connecting the plurality of first bonding pads respectively with the plurality of second bonding pads by forming a plurality of connectors respectively in the plurality of vias.
  2. The method of claim 1, wherein the one or more of the plurality of vias extends through one of the plurality of first bonding pads.
  3. The method of claim 1, wherein the one or more of the plurality of vias directly abut an edge of one of the plurality of first bonding pads.
  4. The method of any one of claims 1 to 3, further comprising, prior to forming the plurality of vias, forming an optical film on a second side of the display panel substantially opposite to the first side; and
    wherein the plurality of vias are formed to extend through the display panel and the optical film in the bonding region.
  5. The method of claim 4, further comprising:
    subsequent to forming the optical film, forming a protective film on a side of the optical film distal to the display panel; and
    subsequent to forming the plurality of vias, removing the protective film from the optical film.
  6. The method of claim 5, wherein one or more of the plurality of vias extend through the display panel and the optical film in the bonding region, and at least partially extend into the protective film.
  7. The method of any one of claims 1 to 6, wherein, prior to forming the plurality of vias, an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel, thereby forming an overlapping region.
  8. The method of claim 7, wherein each of the plurality of vias are formed at least partially in the overlapping region.
  9. The method of claim 8, wherein each of the plurality of vias are formed at least partially in the overlapping region, and adjacent to an edge of the overlapping region.
  10. The method of claim 8, wherein each of the plurality of vias are formed at least partially in the overlapping region, and directly abutting an edge of the overlapping region.
  11. The method of claim 7, wherein each of the plurality of vias are formed outside the overlapping region, and directly abutting an edge of the overlapping region.
  12. The method of any one of claims 1 to 11, wherein forming the plurality of vias are performed by laser perforation.
  13. The method of any one of claims 1 to 12, wherein forming the plurality of connectors respectively in the plurality of vias are performed by sputtering a conductive material in the the plurality of vias.
  14. The method of any one of claims 1 to 13, subsequent to disposing the integrated circuit chip having the plurality of second bonding pads on the second side of the display panel, further comprising aligning the plurality of first bonding pads and the plurality of second bonding pads with each other so that an orthographic projection of each of the plurality of first bonding pads on the display panel at least partially overlaps with an orthographic projection of one of the plurality of second bonding pads on the display panel.
  15. The method of claim 1, wherein an orifice of at least one of the plurality of vias on the first side is surrounded by one of the plurality of first bonding pads.
  16. The method of claim 1, wherein an orifice of one of the plurality of vias on the first side directly abuts one of the plurality of first bonding pads.
  17. The method of any one of claims 1 to 16, wherein the integrated circuit chip is a chip-on-film.
  18. A display apparatus, comprising a display panel and an integrated circuit chip bonded to the display panel according to a method of any one of claims 1 to 17.
  19. The display apparatus of claim 18, wherein the display apparatus is a flexible display apparatus.
  20. The display apparatus of claim 19, wherein the integrated circuit chip is a chip-on-film.
PCT/CN2018/110229 2017-10-27 2018-10-15 Method of bonding integrated circuit chip to display panel, and display apparatus WO2019080736A1 (en)

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EP3701775A1 (en) 2020-09-02
US11367698B2 (en) 2022-06-21

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