KR20170064011A - Display device and printed circuit board including connector for flexible flat cable - Google Patents

Display device and printed circuit board including connector for flexible flat cable Download PDF

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Publication number
KR20170064011A
KR20170064011A KR1020150168179A KR20150168179A KR20170064011A KR 20170064011 A KR20170064011 A KR 20170064011A KR 1020150168179 A KR1020150168179 A KR 1020150168179A KR 20150168179 A KR20150168179 A KR 20150168179A KR 20170064011 A KR20170064011 A KR 20170064011A
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KR
South Korea
Prior art keywords
connector
pads
flat cable
flexible flat
pad
Prior art date
Application number
KR1020150168179A
Other languages
Korean (ko)
Inventor
한규성
김종태
김영옥
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020150168179A priority Critical patent/KR20170064011A/en
Publication of KR20170064011A publication Critical patent/KR20170064011A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/771—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/777—Coupling parts carrying pins, blades or analogous contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/82—Coupling devices connected with low or zero insertion force
    • H01R12/83—Coupling devices connected with low or zero insertion force connected with pivoting of printed circuits or like after insertion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6461—Means for preventing cross-talk
    • H01R13/6467—Means for preventing cross-talk by cross-over of signal conductors
    • H01R13/6469—Means for preventing cross-talk by cross-over of signal conductors on substrates
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The present invention provides a display device including a panel defining a plurality of pixel regions and a printed circuit board disposed around the panel and processing a voltage and a signal for driving the panel. In such a display device, the printed circuit board includes a plurality of pads formed on a substrate and in contact with respective lines of a flexible flat cable (FFC), a plurality of pads And a connector lid positioned above the plurality of pads and pressing the flexible flat cable in the direction of the plurality of pads with a fixing force supported by the connector body.

Figure P1020150168179

Description

Technical Field [0001] The present invention relates to a display device and a printed circuit board including a connector for a flexible flat cable,

The present invention relates to a display device and a printed circuit board included in the display device.

2. Description of the Related Art [0002] With the development of an information society, demands for a display device for displaying an image have increased in various forms. Recently, a liquid crystal display device (LCD), a plasma display panel (PDP) Various display devices such as an organic light emitting display device (OLED) and the like are being utilized.

Such a display device internally includes various constituent devices, which can be electrically connected by a cable.

A flexible flat cable (FFC) is mainly used as a cable for connecting the components. For example, a control printed circuit board and a source printed circuit board included in a display device transmit and receive a voltage and a signal through a flexible flat cable.

The flexible flat cable may be electrically connected to a pattern formed in the printed circuit board through a connector fixed to the printed circuit board.

The connector comprises a connector terminal, a housing and a cover. The connector terminal connected to the pattern of the printed circuit board is in contact with the pad of the flexible flat cable. Through the contact, the flexible flat cable is indirectly connected to the pattern of the printed circuit board .

On the other hand, as the functions of the display device become more advanced, the kinds of signals transmitted and received between the constituent devices increase and their transmission speeds are also increasing.

As the type of signal and the transmission speed of the signal change, the specifications of the flexible flat cable (for example, the number of cable lines and the thickness of the cable line) and the line impedance of the flexible flat cable are changed.

When the transmission impedance and the reception impedance are matched, the maximum power of the signal is transmitted from the transmission side to the reception side. Therefore, the impedance of the connector terminal must be changed in accordance with the line impedance of the flexible flat cable.

However, in the prior art, since the connector terminal is manufactured through a mold, there is a problem that the impedance can not be changed from time to time. In addition, in the case of a metal mold, there is a limit in the thickness of a connector terminal that can be manufactured. However, due to this limitation, the prior art has a problem in increasing the impedance of the connector terminal to a certain value or more.

In view of the foregoing, an object of the present invention is, in one aspect, to provide a connector technology for a flexible flat cable having a structure in which an impedance can be easily controlled. In another aspect, the present invention provides a technique for removing a connector terminal which is not easy to manufacture and connecting a flexible flat cable directly to a printed circuit board.

In order to achieve the above object, in one aspect, the present invention provides a display device comprising a panel defining a plurality of pixel regions and a printed circuit board disposed around the panel and processing a voltage and a signal for driving the panel, Lt; / RTI > In such a display device, the printed circuit board includes a plurality of pads formed on a substrate and in contact with respective lines of a flexible flat cable (FFC), a plurality of pads And a connector lid positioned above the plurality of pads and pressing the flexible flat cable in the direction of the plurality of pads with a fixing force supported by the connector body.

In another aspect, the present invention provides a printed circuit board that is disposed around a panel in which a plurality of pixel regions are defined and processes voltages and signals for driving the panel. Such a printed circuit board includes a plurality of pads formed on a substrate and contacting each line of a flexible flat cable (FFC), a plurality of pads which are fixed to the substrate and surround a plurality of pads, And a connector cover which is positioned above the plurality of pads and presses the flexible flat cable in a plurality of pad directions with a fixing force supported by the connector body.

As described above, according to the present invention, impedance control of a connector connected to a flexible flat cable is easy and high-speed transmission of signals can be achieved. In addition, by removing the connector terminal constituting the connector, the steps required for manufacturing the connector can be shortened and the cost can be reduced.

1 is a schematic system configuration diagram of a display apparatus 100 according to the present embodiments.
2 is an exploded perspective view of a conventional connector.
3 is a view showing an impedance matching relationship in the prior art.
4 is a perspective view of a printed circuit board 400 according to an embodiment of the present invention.
5 is a sectional view of a portion II 'in FIG.
6 is a view showing an embodiment in which a protrusion is further formed on the connector cover.
7 is a view showing an embodiment in which the protruding portion is constituted by a plurality of protrusions.
8 is a view showing an example of the shape of the connector pad 420. FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected." In the same context, when an element is described as being formed on an "upper" or "lower" side of another element, the element may be formed either directly or indirectly through another element As will be understood by those skilled in the art.

1 is a schematic system configuration diagram of a display apparatus 100 according to the present embodiments.

Referring to FIG. 1, a display device 100 according to the present embodiment includes a plurality of pixel regions, a plurality of data lines and a plurality of gate lines, A data driver 120 connected to the panel 110 and driving a plurality of data lines, a gate driver 130 driving a plurality of gate lines, A timing controller 140 for controlling the data driver 120 and the gate driver 130, and the like.

The data driver 120 drives a plurality of data lines by supplying data voltages to the plurality of data lines.

The gate driver 130 sequentially supplies the scan signals to the plurality of gate lines to sequentially drive the plurality of gate lines.

The timing controller 140 controls the data driver 120 and the gate driver 130 by supplying various control signals to the data driver 120 and the gate driver 130.

The timing controller 140 starts scanning according to the timing implemented in each frame, switches the input image data inputted from the outside according to the data signal format used by the data driver 120, Output. Then, the timing controller 140 controls the data driving at a proper time according to the scan.

The gate driver 130 sequentially supplies the scan signals of the On voltage or the Off voltage to the plurality of gate lines and sequentially drives the plurality of gate lines under the control of the timing controller 140.

1, the gate driver 130 may be located only on one side of the panel 110, or may be located on both sides, depending on the driving method, the panel designing method, and the like.

In addition, the gate driver 130 may include one or more gate driver integrated circuits.

Each gate driver integrated circuit may be connected to a bonding pad of the panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method, or may be connected to a bonding pad of a GIP (Gate In Panel) type And may be disposed directly on the panel 110, and may be integrated on the panel 110 as the case may be.

Each gate driver integrated circuit may be implemented by a chip on film (COF) method, as shown in FIG. In this case, the gate drive chip 132 corresponding to each gate driver integrated circuit is mounted on the flexible film 131, and one end of the flexible film 131 can be bonded to the panel 110.

When the specific gate line is opened, the data driver 120 converts the image data received from the timing controller 140 into an analog data voltage and supplies the data voltage to a plurality of data lines to drive the plurality of data lines.

The data driver 120 may include at least one source driver integrated circuit to drive a plurality of data lines.

Each source driver integrated circuit may be connected to a bonding pad of the panel 110 in a tape automated bonding (TAB) or chip on glass (COG) Or may be integrated and disposed in the panel 110, as the case may be.

In addition, each source driver integrated circuit may be implemented by a chip on film (COF) method, as shown in FIG. In this case, the source driver chip 122 corresponding to each source driver integrated circuit is mounted on a flexible film 121, and one end of the flexible film 121 is connected to at least one source printed circuit board Board 150, and the other end is bonded to the panel 110.

Referring to FIG. 1, a source printed circuit board 150 is mounted on a control printed circuit board 160 through a flexible flat cable 170 positioned around the panel 110, . The source printed circuit board 150 receives and processes voltages and signals for driving the panel 110 from the control printed circuit board 160.

On the control printed circuit board 160, a timing controller 140 is disposed.

A power controller (not shown) for controlling various voltages or currents to supply or supply various voltages or currents to the panel 110, the data driver 120, and the gate driver 130 may be further disposed on the control printed circuit board have.

Meanwhile, the flexible flat cable 170 may be connected to the source printed circuit board 150 or the control printed circuit board 160 through the connector 180.

2 is an exploded perspective view of a conventional connector.

Referring to FIG. 2, the conventional connector 200 may include a connector housing 210, a connector terminal 220, and a connector cover 230.

The connector terminal 220 can be connected to a pattern printed on the printed circuit board, with the body being seated in the connector housing 210.

The flexible flat cable 170 is inserted between the connector terminal 220 and the connector cover 230. The pad located on the flexible flat cable 170 is in contact with the upper side of the connector terminal 220, so that the pattern of the flexible flat cable 170 and the printed circuit board are indirectly connected.

3 is a view showing an impedance matching relationship in the prior art.

When the flexible flat cable 170 and the connector terminal 220 are coupled, the impedance of both sides must be in a matching relationship so that a signal of the maximum power can be transmitted and received. As the magnitude of the power of the signal increases, the influence of noise on the signal becomes smaller and the signal transmission rate increases accordingly.

Impedance matching occurs when the output impedance on one side is equal to the input impedance on the other side.

3, the output impedance Zo of the flexible flat cable 170 at the side of the connector terminal 220 is measured and the input impedance Zi of the connector terminal 220 at the side of the flexible flat cable 170 is measured A maximum power signal can be transmitted and received between the flexible flat cable 170 and the connector terminal 220 when the output impedance Zo and the input impedance Zi are substantially equal to each other.

The output impedance Zo of the flexible flat cable 170 may be influenced by the length of the flexible flat cable 170, the cross sectional area of the flexible flat cable 170, and the like. Of course, although the output impedance of a signal transmitter (not shown) that transmits a signal to the flexible flat cable 170 has an important influence on the output impedance Zo of the flexible flat cable 170, Impedance also affects the output impedance Zo thereof.

The kind of the signal transmitted through the flexible flat cable 170 and the transmission speed of the signal may be set differently according to the improvement of the display device 100. [ Accordingly, the impedance of the flexible flat cable 170 also changes, and the output impedance Zo of the flexible flat cable 170 can also be changed.

When the output impedance Zo of the flexible flat cable 170 changes, the impedance of the connector terminal 220 must be changed for impedance matching.

The impedance of the connector terminal 220 can be determined by the type of the material forming the connector terminal 220, the cross-sectional area of the connector terminal 220, and the length of the connector terminal 220.

The impedance of the connector terminal 220 can be adjusted only by the cross-sectional area if there is a limitation on the length of the connector terminal 220 for the standardization of the constraints of space and the configuration of other connectors-the connector housing and the connector cover.

The sectional area of the connector terminal 220 is determined by the product of the transverse length W1 and the transverse length H1. At this time, in order to change the transverse length W1 or the transverse length H1 of the connector terminal 220 There is a problem of changing the mold.

In order to increase the impedance of the connector terminal 220, the transverse length W1 or the longitudinal length H1 must be narrow. Due to the nature of the mold, the transverse length W1 or the longitudinal length H1 of the connector terminal 220, Is less than a certain limit.

4 is a perspective view of a printed circuit board 400 according to an embodiment of the present invention.

The printed circuit board 400 shown in one embodiment may be the source printed circuit board 150 described with reference to FIG. 1 and may be a control printed circuit board 160. Although not shown in FIG. 1, the printed circuit board 400 may be another printed circuit board connected through the flexible flat cable 170.

Referring to FIG. 4, printed circuit board 400 may include a plurality of pads 420 formed on substrate 402 and in contact with respective lines of flexible flat cable 170.

The connector terminal 220 according to the prior art is not included in the printed circuit board 400. The printed circuit board 400 includes a plurality of pads 420 formed directly on the substrate 402 and may be directly connected to the flexible flat cable 170 through the plurality of pads 420.

The plurality of pads 420 may be formed in the same layer as the pattern of the printed circuit board 400, but may be formed on the surface of the substrate 402.

The plurality of pads 420 are directly connected to the pattern of the printed circuit board 400 so that the flexible flat cable 170 is electrically connected to the pattern of the printed circuit board 400 via the plurality of pads 420 .

The number of the plurality of pads 420 may be equal to the number of lines of the flexible flat cable 170. 2, the number of the pads 420 may be equal to the number of the terminals of the connector terminal 220.

The printed circuit board 400 may include a connector body 410 that is fixed to the substrate 402 and surrounds the plurality of pads 420 at a periphery of a portion where the plurality of pads 420 are located.

The connector body 410 may correspond to the connector housing 210 in the prior art.

The height of the connector body 410 is lower than that of the connector housing 210 in the prior art, when comparing the connector housing 210 and the connector body 410 in the prior art.

The connector housing 210 in the prior art includes a portion where the connector terminal 220 is seated. On the contrary, the connector body 410 has no portion for seating the connector terminal 220 and the internal space is empty.

Since the connector terminal 220 is removed from the display device 100 according to an embodiment of the present invention, the height of the connector body 410 is set to a height of the connector terminal 220 or a height . ≪ / RTI >

It is very important to lower the height of each component such as a connector used in the display apparatus 100 in a trend that the thickness of the display apparatus 100 becomes thinner and thinner. In this respect, the display device 100 according to one embodiment has an advantage that the connector terminal 220 can be removed, thereby lowering the overall height of the connector portion.

The connector body 410 surrounds the plurality of pads 420 and the inner space is empty. At this time, since the flexible flat cable 170 is inserted into one side, the connector body 410 may have a 'C' shape as a whole.

A flexible flat cable 170 may be inserted into a portion of the connector body 410 that is opened in a 'C' shape, and a plurality of pads 420 may be formed on the substrate 402.

The connector body 410 may be attached to the substrate 402. The connector body 410 can be attached to the substrate 402 via bonding and can be attached to the substrate 402 through a constant bonding structure-male and female connecting structure.

The printed circuit board 400 includes a connector cover 430 which is positioned above the plurality of pads 420 and presses the flexible flat cable 170 in the direction of the plurality of pads 420 with a fixing force supported by the connector body 410 .

A plurality of pads 420, a flexible flat cable 170 and a connector lid 430 are sequentially connected and the connector lid 430 and the board 402 are pressed together on both sides, (420) and the flexible flat cable (170).

At this time, the connector cover 430 is fixed to the connector body 410, thereby forming a fixing force for fixing the flexible flat cable 170.

4, the connector cover 430 may be fixed to the connector body 410. However, the connector cover 430 may have a structure capable of moving around a certain axis, 410).

An operator of inserting the flexible flat cable 170 in the movable structure firstly opens the connector cover 430 and inserts the flexible flat cable 170 into the inner space of the connector body 410, The flexible flat cable 170 may be inserted into the connector body 410 by moving the flexible flat cable 170 over the flexible flat cable 170.

In the case of working in this manner, there is an advantage that the insertion operation of the flexible flat cable 170 becomes easier.

The connector cover 430 may be coupled to an opening formed in the connector body 410 at one side edge of the connector cover 430 and one side edge of the connector cover 430 contacts the connector body 410. Through this structure, the connector cover 430 can be rotated around one side edge thereof.

The connector lid 430 includes coupling protrusions at both sides perpendicular to the rotation axis. When the connector lid 430 is brought into contact with the connector body 410 by the rotation of the connector lid 430, So that the connector body 430 is fixed to the connector body 410.

5 is a sectional view taken along the line I-I 'in FIG.

A pad 174 is formed at the end of each line 172 in the flexible flat cable 170 and the pad 174 can contact the pad 420 formed on the substrate 402.

The pads 174 formed on the flexible flat cable 170 and the pads 420 formed on the substrate 402 may be formed of the same material or different materials. The pads 174 and 420 may have the same shape or different shapes. A pad positioned on the flexible flat cable 170 is referred to as a cable pad 174 and a pad formed on the substrate 402 is referred to as a connector pad 420 .

5, when the connector pad 420 is positioned on the substrate 402 and the cable pad 174 is positioned on the connector pad 420, the cable pad 174 and the connector pad 420 are electrically connected to each other do.

The cable pad 420 is electrically connected to each line 172 of the flexible flat cable 170. Accordingly, the flexible flat cable 170 is connected in the order of the line 172, the cable pad 174, the connector pad 420, and the pattern of the substrate 402.

The connector lid 430 is positioned on the flexible flat cable 170 and the connector lid 430 is fixed to the connector body 410 fixed to the board 402.

On the other hand, since the cable pad 174 and the connector pad 420 are in simple contact with each other on the face-to-face basis, the contact resistance may vary depending on the contact strength.

The contact strength between the cable pad 174 and the connector pad 420 must be strong in order to reduce the contact resistance between the cable pad 174 and the connector pad 420 or to keep the contact resistance uniform. The contact strength between the cable pad 174 and the connector pad 420 must be strong so that the flexible flat cable 170 is not separated from the printed circuit board 400 due to movement or vibration of the display device 100 .

The connector cover 430 is fixed to the connector body 410 and presses the flexible flat cable 170 in the direction of the connector pad 420 with a fixing force supported by the connector body 410. The contact strength between the cable pad 174 and the connector pad 420 is increased.

The display device 100 may further include an additional structure to increase the contact strength between the cable pad 174 and the connector pad 420. [

6 is a view showing an embodiment in which a protrusion is further formed on the connector cover.

Referring to FIG. 6, the protrusion 610 may be positioned in the connector cover 430 in the direction of the connector pad 420.

The protrusion 610 may have a cross-section as shown in Fig. 6, a quadrangle, a semicircle, and may have a polygonal shape depending on the embodiment.

The protrusion 610 may have a columnar shape as a whole. As shown in FIG. 6, when the cross section is a quadrangle, it may have a quadrangular prism shape as a whole, or may have a semicircular prism shape when the cross section is a semicircle.

The protrusion 610 may be located at a portion corresponding to the position of the connector pad 420. Of course, depending on the embodiment, the protrusion 610 may be extended to other portions, but a portion that is necessarily included is a portion corresponding to the connector pad 420.

The protruding portion 610 further presses the flexible flat cable 170 and the connector pad 420 using the protruding portion.

The protrusion 610 may be formed of a plurality of protrusions.

7 is a view showing an embodiment in which the protruding portion is constituted by a plurality of protrusions.

7 is a sectional view of a connector portion of the printed circuit board 400 viewed from the direction in which the flexible flat cable 170 is inserted.

Referring to FIG. 7, a cable pad 174 is positioned on the substrate 402 such that a plurality of connector pads 420 are spaced apart from each other and correspond to the respective connector pads 420.

Above the cable pad 174, each line portion 172 of the flexible flat cable 170 is positioned and the connector cover 430 is positioned thereon.

At this time, the connector lid 430 is provided with a protrusion for increasing the pressing force. The protrusion may be formed of a plurality of protrusions 611 as shown in Fig.

Each protrusion 611 constituting the protrusion may be disposed at a portion corresponding to each position of the connector pad 420. The pressing force between the cable pad 174 and the connector pad 420 can be increased by arranging the protrusions 611, the cable pads 174 and the connector pads 420 in a line.

Meanwhile, since the shape of the connector pad 420 is freely adjustable, the impedance of the connector pad 420 is more easily controlled than that of the conventional connector terminal 220 described with reference to FIG.

8 is a view showing an example of the shape of the connector pad 420. FIG.

The shape of the connector pad 420 may be determined according to a previously calculated impedance size.

The output impedance Zo of the flexible flat cable 170 viewed from the connector side as shown in Fig. 3 can be measured. Depending on the output impedance Zo, the impedance that the connector pad 420 should have can be calculated.

The length L2, the width W2, and the height H2 of the connector pad 420 can be determined in accordance with the calculation of the impedance size with respect to the connector pad 420. [

The longer the length L2, the more the impedance of the connector pad 420 increases. As the width W2 and the height H2 increase, the impedance of the connector pad 420 decreases.

The width W2 of the connector pad 420 must match the width of the cable pad 174 so that the impedance of the connector pad 420 can be controlled by the height H2 and the length L2 of the connector pad 420 have.

Through this process, the input impedance of the connector pad 420 can be controlled to be substantially equal to the output impedance of the flexible flat cable 170.

The input impedance of the connector pad 420 may be controlled to be within a certain range from the output impedance of the flexible flat cable 170, even if it is not substantially the same under other conditions.

When the output impedance of the flexible flat cable 170 is matched with the input impedance of the connector pad 420, the signal of the maximum power is transmitted, thereby enabling high-speed transmission of the signal.

As described above, according to the present invention, impedance control of a connector connected to a flexible flat cable is easy and high-speed transmission of signals can be achieved. In addition, by removing the connector terminal constituting the connector, the steps required for manufacturing the connector can be shortened and the cost can be reduced.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (9)

A panel in which a plurality of pixel regions are defined; And
And a printed circuit board disposed around the panel and processing a voltage and a signal for driving the panel,
Wherein the printed circuit board includes:
A plurality of pads formed on the substrate and in contact with respective lines of a flexible flat cable (FFC)
A connector body fixed to the substrate and surrounding the plurality of pads at a periphery of a portion where the plurality of pads are located,
And a connector cover disposed on the plurality of pads and pressing the flexible flat cable in the direction of the plurality of pads with a fixing force supported by the connector body. The method according to claim 1,
Wherein protrusions are located in portions of the connector cover corresponding to the positions of the plurality of pads in the plurality of pad directions. 3. The method of claim 2,
The protruding portion
Wherein each of the plurality of projections is disposed at a portion corresponding to each position of the plurality of pads. The method according to claim 1,
Wherein a shape of the pad is determined according to a magnitude of an impedance previously calculated with respect to the pad. The method according to claim 1,
Wherein an input impedance of the pad is substantially equal to an output impedance of the flexible flat cable. A printed circuit board (PCB) for processing a voltage and a signal for driving the panel, the PCB surrounding the panel defining a plurality of pixel regions,
A plurality of pads formed on the substrate and in contact with respective lines of a flexible flat cable (FFC)
A connector body fixed to the substrate and surrounding the plurality of pads at a periphery of a portion where the plurality of pads are located,
And a connector lid which is positioned above the plurality of pads and which presses the flexible flat cable in the direction of the plurality of pads with a fixing force supported by the connector body. The method according to claim 6,
Wherein protrusions are located in portions of the connector cover corresponding to the positions of the plurality of pads in the plurality of pad directions. 8. The method of claim 7,
The protruding portion
Wherein each of the plurality of projections is disposed at a portion corresponding to each position of the plurality of pads. The method according to claim 6,
Wherein an input impedance of the pad is substantially equal to an output impedance of the flexible flat cable.
KR1020150168179A 2015-11-30 2015-11-30 Display device and printed circuit board including connector for flexible flat cable KR20170064011A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200014469A (en) * 2018-07-31 2020-02-11 삼성디스플레이 주식회사 Connector and display device including the connector
CN112864658A (en) * 2019-11-28 2021-05-28 三星显示有限公司 Display device including connector
US11044804B2 (en) 2018-10-04 2021-06-22 Samsung Display Co., Ltd. Connector assembly and display device having the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200014469A (en) * 2018-07-31 2020-02-11 삼성디스플레이 주식회사 Connector and display device including the connector
US11044804B2 (en) 2018-10-04 2021-06-22 Samsung Display Co., Ltd. Connector assembly and display device having the same
CN112864658A (en) * 2019-11-28 2021-05-28 三星显示有限公司 Display device including connector
US11424085B2 (en) 2019-11-28 2022-08-23 Samsung Display Co., Ltd. Connector and display device including the same

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