CN109407358B - Display panel and repairing method thereof - Google Patents

Display panel and repairing method thereof Download PDF

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Publication number
CN109407358B
CN109407358B CN201811271800.1A CN201811271800A CN109407358B CN 109407358 B CN109407358 B CN 109407358B CN 201811271800 A CN201811271800 A CN 201811271800A CN 109407358 B CN109407358 B CN 109407358B
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China
Prior art keywords
area
layer
display panel
welded
circuit board
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Application number
CN201811271800.1A
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Chinese (zh)
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CN109407358A (en
Inventor
庄益壮
张小新
钟兴进
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TCL Huaxing Photoelectric Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to CN201811271800.1A priority Critical patent/CN109407358B/en
Publication of CN109407358A publication Critical patent/CN109407358A/en
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    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/1306Details
    • G02F1/1309Repairing; Testing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/48Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/488Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
    • H01L23/498Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
    • H01L23/49838Geometry or layout
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays

Abstract

The invention provides a display panel and a repairing method thereof, wherein the panel comprises: the array substrate, the cross-sectional structure of array substrate includes: a substrate base plate; the metal layer is arranged on the substrate base plate; the first protection layer is arranged on the metal layer, and a plurality of through holes are formed in the first protection layer; the transparent conducting layer is positioned in the through hole and on the first protective layer; the array substrate is provided with a display area and a binding area, and the binding area comprises a reserved area and a to-be-welded area; the reserved area and the area to be welded are covered with a plurality of through holes, and a second protective layer is arranged on the transparent conductive layer of the reserved area; and when the connecting wire in the welding area to be welded is damaged, the reserved area is electrically connected with the flexible circuit board. The repair method of the display panel and the display panel can improve the product yield and reduce the production cost.

Description

Display panel and repairing method thereof
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a repairing method thereof.
[ background of the invention ]
As shown in fig. 1, the bonding area structure includes a substrate 11, a metal layer 12 having a plurality of connection lines, a protective layer 13, and a transparent conductive layer 14, wherein the protective layer 13 is provided with a plurality of via holes (via holes) 101, the via holes 101 are filled with the transparent conductive layer 14, and the rest of the transparent conductive layer 14 is located on the protective layer 13, and then a flexible circuit board (COF) is attached to connect the via holes 101 to the flexible circuit board.
However, before the COF is attached, the ITO in the via hole 101 of the bonding region is easily contaminated by the outside, so that the connection line is damaged. After COF is attached, if external corrosive liquid enters, the connecting wire can still be damaged. After the connecting wire is damaged, the bonding area and the flexible circuit board cannot be conducted through signals, external signals cannot be transmitted, the product yield is reduced, products can only be scrapped, and therefore production cost is increased.
Therefore, it is necessary to provide a method for repairing a display panel and a display panel, so as to solve the problems in the prior art.
[ summary of the invention ]
The invention aims to provide a display panel and a repairing method thereof, which can improve the product yield and reduce the production cost.
To solve the above technical problem, the present invention provides a display panel, which includes:
the cross-sectional structure of the array substrate includes:
a substrate base plate;
the metal layer is arranged on the substrate base plate;
the first protection layer is arranged on the metal layer, and a plurality of through holes are formed in the first protection layer;
the transparent conducting layer is positioned in the through hole and on the first protective layer; the array substrate is provided with a display area and a binding area, and the binding area comprises a reserved area and a to-be-welded area; the reserved area and the area to be welded are covered with a plurality of through holes, a second protective layer is further arranged on the transparent conductive layer in the reserved area, and when the connecting line in the area to be welded is damaged, the reserved area is electrically connected with the flexible circuit board.
In the display panel of the present invention, the reserved area is close to the display area, and the area to be welded is far from the display area.
In the display panel of the invention, the material of the second protective layer is an insulating material.
In the display panel, when the connecting line in the welding area is damaged, the connecting line in the reserved area is electrically connected with the flexible circuit board through the anisotropic conductive adhesive film.
In the display panel of the invention, the metal layer includes at least two sub-metal layers, an insulating layer is disposed between two adjacent sub-metal layers, and the sub-metal layers are electrically connected with each other.
The invention also provides a repair method of the display panel, wherein the display panel comprises the following steps:
the cross-sectional structure of the array substrate includes:
a substrate base plate;
the metal layer is arranged on the substrate base plate;
the first protection layer is arranged on the metal layer, and a plurality of through holes are formed in the first protection layer;
the transparent conducting layer is positioned in the through hole and on the first protective layer; the array substrate is provided with a display area and a binding area, and the binding area comprises a reserved area and a to-be-welded area; the reserved area and the area to be welded are covered with a plurality of through holes, a second protective layer is arranged on the transparent conductive layer of the reserved area, and when a connecting wire in the area to be welded is damaged, the reserved area is electrically connected with the flexible circuit board;
the method comprises the following steps:
separating the to-be-welded area from the flexible circuit board, and cutting the reserved area from the to-be-welded area;
removing the second protective layer;
and electrically connecting the reserved area with the flexible circuit board.
In the repairing method of the display panel of the present invention, the step of electrically connecting the reserved area and the flexible circuit board includes: and attaching an anisotropic conductive adhesive film to the transparent conductive layer positioned in the reserved area, and laminating the flexible circuit board and the reserved area.
In the repair method of a display panel of the present invention, the removing the second protective layer includes:
the second protective layer is removed by etching or laser.
In the repair method of a display panel of the present invention, the step of separating the pad to be soldered from the flexible circuit board includes:
and heating the anisotropic conductive adhesive film between the to-be-welded area and the flexible circuit board to soften the anisotropic conductive adhesive film and strip the flexible circuit board.
In the repairing method of the display panel, the reserved area is close to the display area, and the area to be welded is far away from the display area.
According to the display panel and the repair method thereof, the part of the binding region is connected with the flexible circuit board, and when the connecting wire of the part of the binding region is damaged, the remaining part of the binding region is electrically connected with the flexible circuit board, so that the condition that an external signal cannot be input into the display panel is avoided, the product yield is improved, and the production cost is reduced.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a bonding area of a conventional display panel;
fig. 2 is a schematic structural diagram of a bonding area of a display panel according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a display panel according to the present invention when a bonding area is connected to a flexible circuit board;
FIG. 4 is a schematic structural diagram of a first step of a repairing method for a display panel according to the present invention;
FIG. 5 is a structural diagram of a second step of the repairing method for a display panel according to the present invention;
fig. 6 is a schematic structural diagram of a third step of the repairing method of the display panel according to the present invention.
Fig. 7 is a schematic structural diagram of a bonding area of a display panel according to a second embodiment of the present invention.
[ detailed description ] embodiments
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. In the present invention, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc. refer to directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
Referring to fig. 2 to 6, fig. 2 is a schematic structural diagram of a bonding area of a display panel according to a first embodiment of the invention.
As shown in fig. 2, the display panel of the present embodiment includes an array substrate, and a cross-sectional structure of the array substrate includes: a base substrate 11, a metal layer 12, a first protective layer 13, and a transparent conductive layer 14.
The metal layer 12 is disposed on the substrate 11, the metal layer 12 includes a plurality of connecting lines, one end of each connecting line is connected to a signal line (data line, scan line) of the display area, and the other end of each connecting line is connected to the flexible circuit board. The metal layer 12 has a single-layer structure.
The first protection layer 13 is disposed on the metal layer 12, and a plurality of via holes 101, that is, via holes, are disposed on the first protection layer 13.
A transparent conductive layer 14 is located within the via hole 101 and on the first protective layer 13.
In a top view, the array substrate has a display area (not shown in the figure) and a bonding area, wherein the bonding area comprises a reserved area 201 and an area to be welded 202; the reserved area 201 and the area to be welded 202 both cover a plurality of the via holes 101, that is, the reserved area 201 and the area to be welded 202 both have a plurality of connecting lines, and the connecting lines are scanning connecting lines or connecting lines connected with data lines. That is, the connection line is a scan connection line for supplying a scan signal or a connection line for supplying a data signal.
A second protection layer 15 is further disposed on the transparent conductive layer 14 of the reserved area 201, and when the connecting line in the area to be welded 202 is damaged, the reserved area 201 is electrically connected to the flexible circuit board. For example, as shown in fig. 3, in the initial state, the pad 202 is electrically connected to the flexible circuit board 20. Wherein the bonding pad 202 is electrically connected to the flexible circuit board 20 through the anisotropic conductive film. When the connecting wires in the to-be-welded area 202 are damaged, the reserved area 201 is electrically connected with the flexible circuit board 20.
Wherein the reserved area 201 is close to the display area, and the area to be welded 202 is far away from the display area. That is, the reserved area 201 is close to the inner side of the array substrate, and the area to be welded 202 is close to the edge of the array substrate.
In one embodiment, the material of the second protection layer 15 is an insulating material. Wherein the material of the second protective layer 15 is, for example, an organic material or an inorganic material.
In an embodiment, referring to fig. 6, when the connection line in the to-be-soldered area 202 is damaged, the connection line in the reserved area 201 is electrically connected to the flexible circuit board 20 through an anisotropic conductive adhesive film. Specifically, the second protection layer 15 is removed, and an Anisotropic Conductive Film (ACF)21 is attached on the transparent conductive layer 14 of the reserved area 201, wherein the anisotropic conductive film 21 is doped with conductive particles, and the conductive particles make the connection lines of the reserved area and the pins of the flexible circuit board 20 electrically connected, as described below.
It is understood that the display panel of the present invention may be a liquid crystal display panel or an organic light emitting diode display.
The invention also provides a repair method of the display panel, which is particularly used for repairing the binding area of the display panel, and the method comprises the following steps:
s101, separating the to-be-welded area from the flexible circuit board, and cutting the reserved area from the to-be-welded area;
for example, in conjunction with fig. 3 and 4, the to-be-soldered area 202 is separated from the flexible circuit board 20, wherein the step includes: and heating the anisotropic conductive film between the to-be-welded area 202 and the flexible circuit board 20 to soften the anisotropic conductive film and peel off the flexible circuit board 20.
Then, the reserved area 201 and the area to be welded 202 are separated, for example, a gap is cut between the reserved area 201 and the area to be welded 202, so that the reserved area 201 and the area to be welded 202 are disconnected, and the corrosion liquid is prevented from penetrating into the reserved area 201 after the area to be welded 202 is corroded and damaged.
And S102, removing the second protective layer.
For example, as shown in fig. 5, when the second protective layer 15 is an organic material, the second protective layer 15 may be removed using a chemical etching method.
When the second protective layer 15 is an inorganic material, the second protective layer 15 may be removed by laser.
S103, electrically connecting the reserved area with the flexible circuit board.
For example, as shown in fig. 6, the reserved area 201 is electrically connected to the flexible circuit board 20.
The step of electrically connecting the flexible circuit board with the reserved area comprises the following steps:
and S1031, attaching an anisotropic conductive adhesive film to the transparent conductive layer positioned in the reserved area, and pressing the flexible circuit board and the reserved area.
For example, an anisotropic conductive film is attached to the transparent conductive layer 14 of the reserved area 201 from which the second passivation layer is removed, conductive particles are doped in the anisotropic conductive film 21, the conductive particles enable the connection lines of the reserved area to be conducted with the pins of the flexible circuit board 20, and then the flexible circuit board 20 is pressed with the reserved area 201, so that the pins of the flexible circuit board 20 are electrically connected with the connection lines of the reserved area 201, and external signals are input into the display panel.
Because a part of the binding region is connected with the flexible circuit board, and the protective layer is arranged above the remaining part of the binding region, when the connecting wire of the part of the binding region is damaged, the part of the binding region is separated from the flexible circuit board, then the remaining part of the binding region is separated from the part of the binding region, and then the protective layer on the remaining part of the binding region is removed, so that the remaining part of the binding region is electrically connected with the flexible circuit board, thereby avoiding that an external signal cannot be input into the display panel, improving the product yield and reducing the production cost.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a bonding area of a display panel according to a second embodiment of the present invention.
The bonding region of the present embodiment is different from the previous embodiment in that the metal layer 12 of the present embodiment has a multi-layer structure. As shown in fig. 7, the metal layer 12 includes two sub-metal layers 121, an insulating layer 16 is disposed between two adjacent sub-metal layers 121 and 122, and the sub-metal layers 121 and 122 are electrically connected to each other. For example, vias are disposed on the insulating layer 16 and the first protective layer 13, so that the sub-metal layers 121 and 122 are electrically connected through the transparent conductive layer. It will be appreciated that the metal layer may also include more than two sub-metal layers.
The specific repairing method of the display panel of this embodiment is the same as that of the previous embodiment, and is not described herein again.
According to the display panel and the repair method thereof, the part of the binding region is connected with the flexible circuit board, and when the connecting wire of the part of the binding region is damaged, the remaining part of the binding region is electrically connected with the flexible circuit board, so that the condition that an external signal cannot be input into the display panel is avoided, the product yield is improved, and the production cost is reduced.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (9)

1. A display panel, comprising:
the cross-sectional structure of the array substrate includes:
a substrate base plate;
the metal layer is arranged on the substrate base plate;
the first protection layer is arranged on the metal layer, and a plurality of through holes are formed in the first protection layer;
the transparent conducting layer is positioned in the through hole and on the first protective layer; the array substrate is provided with a display area and a binding area, and the binding area comprises a reserved area and a to-be-welded area; the reserved area and the area to be welded are covered with a plurality of through holes, and a second protective layer is arranged on the transparent conductive layer of the reserved area; when the connecting line in the welding area to be welded is damaged, the reserved area is electrically connected with the flexible circuit board; the reserved area is close to the display area, and the area to be welded is far away from the display area.
2. The display panel according to claim 1,
the material of the second protective layer is an insulating material.
3. The display panel according to claim 1,
when the connecting wire in the welding area is damaged, the connecting wire in the reserved area is electrically connected with the flexible circuit board through the anisotropic conductive adhesive film.
4. The display panel according to claim 1,
the metal layer comprises at least two sub-metal layers, an insulating layer is arranged between every two adjacent sub-metal layers, and the sub-metal layers are electrically connected.
5. A method for repairing a display panel, wherein the display panel comprises:
the cross-sectional structure of the array substrate includes:
a substrate base plate;
the metal layer is arranged on the substrate base plate;
the first protection layer is arranged on the metal layer, and a plurality of through holes are formed in the first protection layer;
the transparent conducting layer is positioned in the through hole and on the first protective layer; the array substrate is provided with a display area and a binding area, and the binding area comprises a reserved area and a to-be-welded area; the reserved area and the area to be welded are covered with a plurality of through holes, a second protective layer is arranged on the transparent conductive layer of the reserved area, and when a connecting wire in the area to be welded is damaged, the reserved area is electrically connected with the flexible circuit board;
characterized in that the method comprises:
separating the to-be-welded area from the flexible circuit board, and cutting the reserved area from the to-be-welded area;
removing the second protective layer;
and electrically connecting the reserved area with the flexible circuit board.
6. The repairing method for the display panel according to claim 5, wherein the step of electrically connecting the reserved area and the flexible circuit board comprises: and attaching an anisotropic conductive adhesive film to the transparent conductive layer positioned in the reserved area, and laminating the flexible circuit board and the reserved area.
7. The repairing method of the display panel according to claim 5, wherein the step of removing the second protective layer comprises:
the second protective layer is removed by etching or laser.
8. The repair method of a display panel according to claim 5, wherein the step of separating the pad-to-be-soldered from the flexible circuit board includes:
and heating the anisotropic conductive adhesive film between the to-be-welded area and the flexible circuit board to soften the anisotropic conductive adhesive film and strip the flexible circuit board.
9. The repair method of a display panel according to claim 5, wherein the reserved area is close to the display area, and the area to be welded is far from the display area.
CN201811271800.1A 2018-10-29 2018-10-29 Display panel and repairing method thereof Active CN109407358B (en)

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CN201811271800.1A CN109407358B (en) 2018-10-29 2018-10-29 Display panel and repairing method thereof
PCT/CN2019/070035 WO2020087771A1 (en) 2018-10-29 2019-01-02 Display panel repairing method and display panel

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CN109407358A (en) 2019-03-01

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