KR100441847B1 - Flexible print circuit cable having two-layer structure for low voltage differential signal transmission, including signal transmission lines arranged into zigzag shapes on both sides of insulation layer - Google Patents

Flexible print circuit cable having two-layer structure for low voltage differential signal transmission, including signal transmission lines arranged into zigzag shapes on both sides of insulation layer Download PDF

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KR100441847B1
KR100441847B1 KR1019970003484A KR19970003484A KR100441847B1 KR 100441847 B1 KR100441847 B1 KR 100441847B1 KR 1019970003484 A KR1019970003484 A KR 1019970003484A KR 19970003484 A KR19970003484 A KR 19970003484A KR 100441847 B1 KR100441847 B1 KR 100441847B1
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signal transmission
circuit cable
low voltage
voltage differential
differential signal
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KR1019970003484A
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Korean (ko)
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KR19980067447A (en
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민진식
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삼성전자주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/002—Pair constructions

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Abstract

PURPOSE: A flexible print circuit cable is provided to reduce transmission noises by preventing transmission signals from being influenced by distortions during transmission. CONSTITUTION: A flexible print circuit cable(10) comprises an insulation layer; and a plurality of signal transmission lines arranged at upper and lower surfaces of the insulation layer and formed into pairs of signal lines(11a,11b to 11m,11n) in a vertical direction. A pair of signal transmission lines are arranged into zigzag shapes and intersected with each other.

Description

저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블2-layer flexible printed circuit cable for low voltage differential signal transmission

본 발명은 플렉서블 프린트 써키트 케이블(flexible print circuit cable) 에 관한 것으로, 더욱 상세하게는 저전압차동신호전송(LVDS: low voltagedifferential signaling) 방식의 케이블 전송 노이즈를 감소시키고 소요 공간을 감소시키도록 한 저전압차동 신호전송용 2층구조의 플렉서블 프린트 써키트 케이블에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible print circuit cable, and more particularly to a low voltage differential signal designed to reduce cable transmission noise and low space required by low voltage differential signaling (LVDS). The present invention relates to a flexible printed circuit cable having a two-layer structure for transmission.

일반적으로 널리 알려진 바와 같이, 쌍으로 이루어진 신호를 차동증폭하여 원래의 신호를 복구하는 저전압차동신호전송방식에서는 전송신호의 왜곡은 치명적이다. 하지만, 쌍의 신호가 동시에 동일 레벨만큼 왜곡되는 것은 두 신호의 차이 변화, 즉 △V의 변화에 영향을 받지 않으므로 수신부에서 왜곡되지 않은 신호를 복구할 수 있다.As is generally known, in a low voltage differential signal transmission method that differentially amplifies a pair of signals to recover an original signal, distortion of the transmission signal is fatal. However, since the signals of the pair are distorted by the same level at the same time are not affected by the difference between the two signals, that is, the change in ΔV, and thus the receiver may recover the undistorted signal.

그런데, 송신부와 수신부와의 상호연결을 위한 종래의 플렉서블 프린트 써키트 케이블에서는 쌍의 신호전송선이 꼬여져 있는데 이는 상기 신호전송선을 통하여 송신단으로부터 전송된 전송신호를 수신단이 차동증폭하기 때문이다.However, in the conventional flexible printed circuit cable for interconnection between the transmitter and the receiver, a pair of signal transmission lines are twisted, because the receiver differentially amplifies the transmission signal transmitted from the transmitter through the signal transmission line.

그러나, 종래의 플렉서블 프린트 써키트 케이블에서는 쌍의 신호전송선이 서로 수평으로 배선되어 있는데 이를 이용하여 저전압차동신호를 전송하는 경우, 외부의 노이즈가 있으면, 도 1에 도시된 바와 같이, 쌍의 전송신호(S+),(S-)에 각각 발생하는 왜곡이 상이하게 나타난다. 이러한 상태의 쌍의 전송신호를 수신단에서 차동증폭하면, 노이즈가 더욱 심하게 발생한다. 이로 인해, 종래의 플렉서블 프린트 써키트 케이블이 저전압차동신호전송용 케이블로서 사용할 수 없는 문제점이 있었다.However, in the conventional flexible printed circuit cable, a pair of signal transmission lines are horizontally wired to each other, and when the low voltage differential signal is transmitted using the same, if there is external noise, as shown in FIG. 1, the pair of transmission signals ( Distortions occurring at S +) and (S-) respectively appear differently. When differentially amplified at the receiving end of the pair of transmission signals in this state, noise is more severely generated. For this reason, there has been a problem that the conventional flexible printed circuit cable cannot be used as a cable for low voltage differential signal transmission.

따라서, 본 발명의 목적은 전송중에 발생하는 왜곡에 영향을 받는 것을 방지하여 전송 노이즈를 감소시키도록 한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 제공하는데 있다.Accordingly, an object of the present invention is to provide a flexible printed circuit cable having a two-layer structure for low voltage differential signal transmission to reduce transmission noise by being prevented from being affected by distortion generated during transmission.

도 1은 종래 기술에 의한 플렉서블 프린트 써키트 케이블을 이용하여 저전압차동신호전송한 경우에서의 노이즈 발생을 나타낸 파형도.BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a waveform diagram showing generation of noise when a low voltage differential signal is transmitted using a flexible printed circuit cable according to the prior art.

도 2는 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 나타낸 평면도.Figure 2 is a plan view showing a flexible printed circuit cable of a two-layer structure for low voltage differential signal transmission according to the present invention.

도 3은 도2의 A-A선을 따라 절단한 단면도.3 is a cross-sectional view taken along the line A-A of FIG.

도 4는 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 이용하여 저전압차동신호전송한 경우에서의 노이즈 발생을 나타낸 파형도.Figure 4 is a waveform diagram showing the generation of noise when the low voltage differential signal transmission using the flexible printed circuit cable of the two-layer structure for low voltage differential signal transmission according to the present invention.

<도면의주요부분에대한부호의설명>Explanation of symbols on the main parts of the drawing

10: 플렉서블 프린트 써키트 케이블 11: 신호전송선 13: 절연층 15: 상층10: flexible printed circuit cable 11: signal transmission line 13: insulation layer 15: upper layer

16: 하층16: lower floor

이와 같은 목적을 달성하기 위한 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블은 쌍의 신호를 전송하기 위한 쌍의 전송선들이 중간 절연층의 상, 하면에 각각 형성되어 2층을 형성하며 양자가 지그재그로 서로 교차하며 배선되어 있는 것을 특징으로 한다. 따라서, 전송 노이즈가 감소하고 소요공간이 감소하여 TFT-LCD의 박형화에 적용하기 쉽다.According to the present invention, a flexible printed circuit cable having a two-layer structure for low voltage differential signal transmission according to the present invention has a pair of transmission lines for transmitting a pair of signals formed on the upper and lower surfaces of the intermediate insulating layer, respectively. It is characterized in that both are zigzag intersecting and wired. Therefore, transmission noise is reduced and space required is easy to apply to thinning of TFT-LCD.

이하, 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 첨부된 도면을 참조하여 상세히 설명하기로 한다.Hereinafter, a flexible printed circuit cable having a low voltage differential signal transmission two-layer structure according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 나타낸 평면도이고, 도 3은 도2의 A-A선을 따라 절단한 단면도이다.2 is a plan view illustrating a flexible printed circuit cable having a two-layer structure for low voltage differential signal transmission according to the present invention, and FIG. 3 is a cross-sectional view taken along the line A-A of FIG.

도 2와 도 3에 도시된 바와 같이, 플렉서블 프린트 써키트 케이블(10)은 도전층으로 이루어진, 쌍의 신호전송선들(11a,11b),(11c,11d),..(11m,11n)이 지그재그 형태로 배선되면서 서로 교차하고 있다. 신호전송선들(11a,11c,..11m)이 상층(15)에 형성되어 있고 신호전송선들(11b,11d,..,11n)이 하층(16)에 형성되어 있고, 상층(15)과 하층(16)의 사이에 절연층(13)이 형성되어 있다.As shown in Figs. 2 and 3, the flexible printed circuit cable 10 is made of a conductive layer, and the pair of signal transmission lines 11a, 11b, 11c, 11d, and 11m, 11n are zigzag. They are wired in the form and cross each other. Signal transmission lines 11a, 11c, ..11m are formed in the upper layer 15, and signal transmission lines 11b, 11d, ..11n are formed in the lower layer 16, and the upper layer 15 and the lower layer. The insulating layer 13 is formed between 16.

이와 같이 구성된 플렉서블 프린트 써키트 케이블의 작용을 도 4를 참조하여 설명하면 다음과 같다. 설명의 편의상 1쌍의 신호 전송선을 기준으로 설명하기로 한다.The operation of the flexible printed circuit cable configured as described above will be described with reference to FIG. 4. For convenience of description, a pair of signal transmission lines will be described.

도 4는 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블을 이용하여 저전압차동신호전송한 경우에서의 노이즈 발생을 나타낸 파형도이다.4 is a waveform diagram illustrating noise generation when a low voltage differential signal is transmitted using a flexible printed circuit cable having a two-layer structure for low voltage differential signal transmission according to the present invention.

전송신호가 플렉서블 프린트 써키트 케이블(10)을 통하여 송신부(도시안됨)로부터 수신부(도시안됨)로 전송되는 도중에 외부로부터 노이즈를 받게 되면, 신호전송선(11a)의 전송신호(S11a)가 왜곡된다. 또한, 신호전송선(11b)의 전송신호(S11b)도 동일하게 공통으로 왜곡된다. 이는 신호 전송선들(11a),(11b)이 절연층(13)을 사이에 두고 상하로 대향하며 위치하고 있어 커패시터의 역할을 수행하기 때문이다.If a transmission signal is received from outside while the transmission signal is transmitted from the transmitter (not shown) to the receiver (not shown) via the flexible printed circuit cable 10, the transmission signal S11a of the signal transmission line 11a is distorted. In addition, the transmission signal S11b of the signal transmission line 11b is similarly distorted in common. This is because the signal transmission lines 11a and 11b face each other up and down with the insulating layer 13 interposed therebetween to serve as a capacitor.

따라서, 수신부에서 전송신호(S11a),(S11b)의 차동증폭시 각각의 왜곡성분이 회복되어 왜곡 발생 이전의 상태로 복구되므로 노이즈가 제거된다.Therefore, when the differential signal of the transmission signals S11a and S11b is recovered by the receiver, the respective distortion components are recovered and restored to the state before the distortion occurs, thereby removing noise.

한편, 쌍의 신호전송선들이 상하로 위치하므로 플렉서블 프린트 써키트 케이블(10)의 폭이 절반으로 감소한다.On the other hand, since the pair of signal transmission lines are positioned up and down, the width of the flexible printed circuit cable 10 is reduced by half.

이상에서 살펴본 바와 같이, 본 발명에 의한 저전압차동신호전송용 2층구조의 플렉서블 프린트 써키트 케이블은 쌍의 전송선들이 절연층의 상, 하에 각각 지그재그로 서로 교차하며 배선되어 전송중에 전송신호의 왜곡이 발생하더라도 원래의 전송신호들이 수신부에서 복구된다. 따라서, 전송신호의 노이즈가 감소된다. 또한, 폭이 감소하여 박형 TFT-LCD에 적용하기에 유리하다.As described above, the flexible printed circuit cable of the two-layer flexible printed circuit cable for low voltage differential signal transmission according to the present invention has a pair of transmission lines crossing each other in a zigzag pattern above and below the insulating layer, causing distortion of the transmission signal during transmission. Even if the original transmission signal is recovered at the receiver. Therefore, the noise of the transmission signal is reduced. In addition, the width is reduced, which is advantageous for application to thin TFT-LCDs.

Claims (2)

플렉서블 프린트 써키트 케이블에 있어서,In the flexible printed circuit cable, 절연층과,With insulation layer, 상기 절연층의 양면에서 상, 하 대칭으로 서로 쌍을 이루도록 형성되는 복수의 신호전송선을 포함하며, 상기 복수의 신호전송선은 각각 지그재그 형태로 형성되는 저전압 차동신호 전송용 2층 구조의 플렉서블 씨키트 케이블.And a plurality of signal transmission lines formed to be paired with each other in both upper and lower symmetry on both sides of the insulating layer, wherein the plurality of signal transmission lines are each formed in a zigzag form. . 제 1 항에 있어서,The method of claim 1, 상기 서로 쌍을 이루는 신호전송선은 서로 교차하는 것을 특징으로 하는 저전압 차동신호 전송용 2층 구조의 플렉서블 씨키트 케이블.The two-layer flexible cable for low-voltage differential signal transmission, characterized in that the pair of signal transmission line crossing each other.
KR1019970003484A 1997-02-05 1997-02-05 Flexible print circuit cable having two-layer structure for low voltage differential signal transmission, including signal transmission lines arranged into zigzag shapes on both sides of insulation layer KR100441847B1 (en)

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KR1019970003484A KR100441847B1 (en) 1997-02-05 1997-02-05 Flexible print circuit cable having two-layer structure for low voltage differential signal transmission, including signal transmission lines arranged into zigzag shapes on both sides of insulation layer

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KR1019970003484A KR100441847B1 (en) 1997-02-05 1997-02-05 Flexible print circuit cable having two-layer structure for low voltage differential signal transmission, including signal transmission lines arranged into zigzag shapes on both sides of insulation layer

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KR100441847B1 true KR100441847B1 (en) 2004-10-26

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KR101008970B1 (en) * 2003-11-28 2011-01-17 삼성전자주식회사 Driving circuit board of liquid crystal display device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03226916A (en) * 1990-01-31 1991-10-07 Furukawa Electric Co Ltd:The Tape like multiple pair cable
KR920016879A (en) * 1991-02-04 1992-09-25 김정배 Installation method of driving circuit of liquid crystal display device using flexible substrate (FPC)
JPH06162830A (en) * 1992-11-18 1994-06-10 Riichi Fujii Conductive, zigzag-curved and converged conductive cable
JPH08288709A (en) * 1995-04-14 1996-11-01 Mitsubishi Heavy Ind Ltd High frequency cable
US5584451A (en) * 1994-03-02 1996-12-17 Seagate Technology, Inc. Apparatus for attaching a printed circuit cable to an actuator arm in a disc drive assembly using formed PCC bracket
JPH09138387A (en) * 1995-11-16 1997-05-27 Hitachi Ltd Liquid crystal display device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03226916A (en) * 1990-01-31 1991-10-07 Furukawa Electric Co Ltd:The Tape like multiple pair cable
KR920016879A (en) * 1991-02-04 1992-09-25 김정배 Installation method of driving circuit of liquid crystal display device using flexible substrate (FPC)
JPH06162830A (en) * 1992-11-18 1994-06-10 Riichi Fujii Conductive, zigzag-curved and converged conductive cable
US5584451A (en) * 1994-03-02 1996-12-17 Seagate Technology, Inc. Apparatus for attaching a printed circuit cable to an actuator arm in a disc drive assembly using formed PCC bracket
JPH08288709A (en) * 1995-04-14 1996-11-01 Mitsubishi Heavy Ind Ltd High frequency cable
JPH09138387A (en) * 1995-11-16 1997-05-27 Hitachi Ltd Liquid crystal display device

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