CN109031733B - Flexible circuit board and display device - Google Patents

Flexible circuit board and display device Download PDF

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Publication number
CN109031733B
CN109031733B CN201810797127.9A CN201810797127A CN109031733B CN 109031733 B CN109031733 B CN 109031733B CN 201810797127 A CN201810797127 A CN 201810797127A CN 109031733 B CN109031733 B CN 109031733B
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pin terminal
circuit board
grooves
colloid
ranges
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CN201810797127.9A
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CN109031733A (en
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陈道义
施展
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/118—Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Structure Of Printed Boards (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention provides a flexible circuit board and a display device, wherein the flexible circuit board is fixed with a display panel through a colloid, and the flexible circuit board comprises a grounding pin terminal; and the grounding pin terminal is provided with a diffusion area, and the diffusion area is used for receiving the colloid and crushing the conductive particles in the colloid. According to the scheme, the diffusion region is arranged on the grounding pin terminal of the flexible circuit board, so that the conductive particles are effectively diffused, and the yield of the display device is improved.

Description

Flexible circuit board and display device
Technical Field
The invention relates to the technical field of display, in particular to a flexible circuit board and a display device.
Background
The maturity of Liquid Crystal Display (LCD) technology has promoted the high-speed development of electronic devices such as smart phones and tablet computers.
Among them, the lcd panel can quickly and accurately display a picture under the control of an external driver chip (IC). Specifically, a Flexible Printed Circuit (FPC) may be used to support the driving chip, and then the driving chip is pressed on the liquid crystal display panel through an Anisotropic Conductive Film (ACF).
The width of the pin terminal of the FPC grounding part is 1.5-2.0 mm, the width range of the ACF is about 1.5 mm, and the diameter range of the conductive particles inside the ACF is 5-10 microns. In the pressing process, the pin terminal of the FPC grounding part is too wide, so that the conductive particles in the ACF close to the pin terminal of the grounding part can be crushed, and the conductive particles in the ACF far away from the pin terminal are difficult to crush, so that the yield of the display is reduced.
Disclosure of Invention
The invention aims to provide a flexible circuit board and a display device, which improve the yield of the display device.
The embodiment of the invention provides a flexible circuit board, wherein the flexible circuit board is fixed with a display panel through a colloid and comprises a grounding pin terminal;
and the grounding pin terminal is provided with a diffusion area, and the diffusion area is used for receiving the colloid and crushing the conductive particles in the colloid.
In some embodiments, the diffusion region includes a plurality of grooves.
In some embodiments, the plurality of grooves are sequentially and longitudinally arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.6 mm to 2 mm.
In some embodiments, the plurality of grooves are sequentially and transversely arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.1 mm to 1.5 mm.
In some embodiments, the diffusion region includes a plurality of through holes arranged in an array, and the diameter of the through holes ranges from 0.2 mm to 0.3 mm.
In some embodiments, the diffusion region includes a plurality of hollow-out regions, the hollow-out regions are sequentially and longitudinally arranged on the ground pin terminal, a width of the hollow-out region ranges from 0.25 mm to 0.35 mm, and a length of the hollow-out region ranges from 0.8 mm to 1.3 mm.
The embodiment of the present invention further provides a display device, including: the flexible circuit board comprises a grounding pin terminal, a colloid layer and a display panel, wherein the colloid layer comprises colloid with conductive particles;
the colloid layer is used for fixing the flexible circuit board and the display panel together;
and the grounding pin terminal is provided with a diffusion area, and the diffusion area is used for receiving the colloid and crushing the conductive particles in the colloid.
In some embodiments, the diffusion region includes a plurality of grooves.
In some embodiments, the plurality of grooves are sequentially and longitudinally arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.6 mm to 2 mm.
In some embodiments, the plurality of grooves are sequentially and transversely arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.1 mm to 1.5 mm.
According to the flexible circuit board and the display device provided by the embodiment of the invention, the diffusion region is arranged on the grounding pin terminal of the flexible circuit board, so that the conductive particles are effectively diffused, and the yield of the display device is improved.
In order to make the aforementioned and other objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:
drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Fig. 2a is a schematic view of a first structure of a flexible printed circuit board according to an embodiment of the present invention.
Fig. 2b is a schematic diagram of a second structure of the flexible printed circuit board according to the embodiment of the present invention.
Fig. 2c is a schematic diagram of a third structure of the flexible printed circuit board according to the embodiment of the present invention.
Fig. 2d is a schematic diagram of a fourth structure of the flexible printed circuit board according to the embodiment of the present invention.
Fig. 2e is a schematic diagram of a fifth structure of the flexible printed circuit board according to the embodiment of the present invention.
Fig. 2f is a schematic diagram of a sixth structure of the flexible printed circuit board according to the embodiment of the present invention.
Fig. 3 is a seventh schematic structural diagram of the flexible printed circuit provided in the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a flexible printed circuit board provided in an embodiment of the present invention and a conventional flexible printed circuit board.
Fig. 5 is a comparative experimental diagram of a flexible printed circuit board according to an embodiment of the present invention and a conventional flexible printed circuit board.
Detailed Description
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.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 1, the display device 1 includes a flexible wiring board 10, a gel layer 20, and a display panel 30.
The glue layer 20 includes glue, and the glue layer 20 is used to fix the flexible wiring board 10 and the display panel 30 together. The colloid has conductive particles, and after the colloid layer 20 is thermally pressed, the conductive particles in the colloid are crushed, so as to electrically connect the flexible circuit board 10 and the display panel 30.
As shown in fig. 2, the flexible printed circuit board 10 includes a ground pin terminal 100, and a diffusion area 1000 is disposed on the ground pin terminal 100, and the diffusion area 1000 is configured to receive the gel and crush conductive particles in the gel.
In some embodiments, as shown in fig. 2 a-2 f, the diffusion region 1000 includes a plurality of grooves. As shown in fig. 2a to 2d, the plurality of grooves are sequentially and longitudinally arranged on the ground pin terminal 100. The size of the longitudinally arranged grooves is set according to the size of the ground pin terminal 100. Since the size of ground pin terminal 100 is typically 1.5 mm by 2 mm. Therefore, it is preferable that the width of the longitudinally arranged grooves is set to be in the range of 0.25 mm to 0.35 mm, and the length is set to be in the range of 1.6 mm to 2 mm.
When the length of the longitudinally arranged grooves reaches 2 mm, that is, the length of the longitudinally arranged grooves is identical to the length of the ground pin terminal 100, the ground pin terminal 100 having the structure shown in fig. 2a can be obtained. When the length of the longitudinally arranged grooves is smaller than the length of the ground pin terminal 100, the longitudinally arranged grooves may be disposed at a position close to the edge of the ground pin terminal 100, so that the ground pin terminal 100 forms a bifurcated shape as shown in fig. 2 b; longitudinally arranged grooves may also be provided in the middle of the ground pin terminal 100, forming a shape as shown in fig. 2 c.
As shown in fig. 2 d-2 f, the plurality of grooves may also be sequentially arranged on the ground pin terminal 100 in a transverse direction, and the size of the grooves arranged in the transverse direction may also be set according to the size of the ground pin terminal 100. Preferably, the width of the transversely arranged grooves ranges from 0.25 mm to 0.35 mm, and the length ranges from 1.1 mm to 1.5 mm.
When the length of the laterally arranged grooves reaches 1.5 mm, i.e. the length of the grooves is consistent with the width of the ground pin terminal 100, the ground pin terminal 100 having the structure shown in fig. 2d can be obtained. When the length of the laterally arranged grooves is smaller than the width of the ground pin terminal 100, the laterally arranged grooves may be disposed at a position close to the edge of the ground pin terminal 100, so that the ground pin terminal 100 forms a bifurcated shape as shown in fig. 2 e; laterally arranged recesses may also be provided in the middle of the ground pin terminal 100, forming a shape as shown in fig. 2 f.
As shown in fig. 3, the diffusion region 1000 may further include a plurality of through holes arranged in an array, and the diameter of the through holes ranges from 0.2 mm to 0.3 mm. Preferably, as shown in fig. 3, the through holes may be arranged in 5 rows and 4 columns.
In some embodiments, the diffusion region 1000 further includes a plurality of hollow-out regions, and the hollow-out regions are sequentially and longitudinally arranged on the ground pin terminal 100. The size of the hollow area is set according to the size of the ground pin terminal 100. Preferably, the width of the hollow-out area ranges from 0.25 mm to 0.35 mm, and the length of the hollow-out area ranges from 0.8 mm to 1.3 mm. It should be noted that the arrangement manner of the hollow-out areas is similar to that of the grooves, and is not described herein again.
Next, experiments can be performed on the existing flexible printed circuit board and the flexible printed circuit board according to the embodiment of the present invention, and the peeling condition of the flexible printed circuit board and the cracking condition of the conductive particles during the connection process between the flexible printed circuit board and the display panel are verified.
In the first aspect, the peeling condition of the conventional flexible wiring board 40 shown in fig. 4 and the peeling condition of the flexible wiring board 10 according to the embodiment of the present invention can be observed after the flexible wiring board and the display panel are fixed for 100 hours under the environmental parameters of 85 relative humidity and 85 temperature. It was found that the peeling phenomenon occurred in the conventional flexible wiring board 40 and the bubbles Q were generated in the flexible wiring board 40 as shown in fig. 5, whereas the peeling phenomenon did not occur in the flexible wiring board 10 of the embodiment of the present invention and the bubbles were not generated in the flexible wiring board 10 as shown in fig. 5.
In the second aspect, after the flexible wiring board is fixed to the display panel, the rupture of the conductive particles corresponding to the conventional flexible wiring board 40 and the rupture of the conductive particles corresponding to the flexible wiring board 10 of the embodiment of the present invention can be observed. As shown in fig. 4, a detection point may be set at the same position of the flexible wiring board 10 of the embodiment of the present invention and the existing flexible wiring board 40: l1, L2, L3, M1, M2, M3, R1, R2, and R3. And determining the rupture condition of the conductive particles by measuring the diameters of the conductive particles corresponding to the detection points. Specifically, at a temperature of 300 ℃, after the conventional flexible wiring board 40 is hot-pressed for 8 seconds, the conductive particle diameters shown in table 1 below can be obtained, and also at a temperature of 300 ℃, after the flexible wiring board 10 according to an embodiment of the present invention is hot-pressed for 8 seconds, the conductive particle diameters shown in table 2 below can be obtained. As can be seen from comparison between tables 1 and 2, the diameters of the conductive particles in table 2 are both greater than 5 micrometers, the diameters of a plurality of conductive particles in table 1 are not greater than 5 micrometers, and the average diameter of the conductive particles of the flexible printed circuit board 10 of the embodiment of the present invention is greater than the average diameter of the conductive particles of the conventional flexible printed circuit board 40, that is, the conductive particles of the flexible printed circuit board 10 of the embodiment of the present invention are broken better than the conductive particles of the conventional flexible printed circuit board 40.
TABLE 1
Figure BDA0001736194900000081
TABLE 2
Figure BDA0001736194900000091
According to the flexible circuit board and the display device provided by the embodiment of the invention, the diffusion region is arranged on the grounding pin terminal of the flexible circuit board, so that the conductive particles are effectively diffused, and the yield of the display device is improved.
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 (10)

1. A flexible circuit board is fixed with a display panel through glue, and is characterized in that the flexible circuit board comprises a grounding pin terminal;
a diffusion region is arranged on the grounding pin terminal;
and under the state that the colloid is hot-pressed, the diffusion area is used for receiving the colloid and crushing the conductive particles in the colloid.
2. The flexible wiring board of claim 1, wherein the diffusion region comprises a plurality of grooves.
3. The flexible wiring board of claim 2, wherein the plurality of grooves are sequentially and longitudinally arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.6 mm to 2 mm.
4. The flexible wiring board of claim 2, wherein the plurality of grooves are sequentially arranged transversely on the ground pin terminal, the width of the grooves ranges from 0.25 mm to 0.35 mm, and the length of the grooves ranges from 1.1 mm to 1.5 mm.
5. The flexible wiring board of claim 1, wherein the diffusion region comprises a plurality of through holes arranged in an array, and the diameter of the through holes ranges from 0.2 mm to 0.3 mm.
6. The flexible circuit board of claim 2, wherein the diffusion region comprises a plurality of hollow-out regions, the plurality of hollow-out regions are sequentially and longitudinally arranged on the ground pin terminal, the width of each hollow-out region ranges from 0.25 mm to 0.35 mm, and the length of each hollow-out region ranges from 0.8 mm to 1.3 mm.
7. A display device, comprising: the flexible circuit board comprises a grounding pin terminal, a colloid layer and a display panel, wherein the colloid layer comprises colloid with conductive particles;
the colloid layer is used for fixing the flexible circuit board and the display panel together;
and the grounding pin terminal is provided with a diffusion area, and the diffusion area is used for receiving the colloid and crushing the conductive particles in the colloid.
8. The display device according to claim 7, wherein the diffusion region comprises a plurality of grooves.
9. The display device according to claim 8, wherein the plurality of grooves are sequentially and longitudinally arranged on the ground pin terminal, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.6 mm to 2 mm.
10. The display device according to claim 8, wherein the plurality of grooves are sequentially arranged on the ground pin terminal in a transverse direction, the width of each groove ranges from 0.25 mm to 0.35 mm, and the length of each groove ranges from 1.1 mm to 1.5 mm.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI262346B (en) * 2001-11-08 2006-09-21 Hitachi Ltd Liquid crystal display device
CN102316664A (en) * 2010-07-02 2012-01-11 富葵精密组件(深圳)有限公司 Flexible circuit board and manufacture method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105572985A (en) * 2015-12-23 2016-05-11 南京中电熊猫液晶显示科技有限公司 COF substrate and liquid crystal display panel connected with same
CN205726657U (en) * 2016-05-10 2016-11-23 Tcl显示科技（惠州）有限公司 Flexible PCB
CN205643942U (en) * 2016-05-24 2016-10-12 合肥京东方光电科技有限公司 Circuit plate structure and display device
CN207053876U (en) * 2017-08-16 2018-02-27 信利光电股份有限公司 A kind of FPC and electronic equipment
CN107644593B (en) * 2017-09-06 2020-06-09 武汉华星光电半导体显示技术有限公司 Flexible OLED display panel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI262346B (en) * 2001-11-08 2006-09-21 Hitachi Ltd Liquid crystal display device
CN102316664A (en) * 2010-07-02 2012-01-11 富葵精密组件(深圳)有限公司 Flexible circuit board and manufacture method thereof

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