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Characteristic impedance 85-115 omega flexible line structure

A flexible cable, characteristic impedance technology, applied in conductors, insulated cables, electrical components, etc., can solve problems such as non-compliance with the use specifications of LVDS signal transmission lines, signal loss, deformation, etc.

Active Publication Date: 2005-01-05
P TWO ELECTRONICS SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Otherwise, signal reflection and noise interference will occur, resulting in signal loss, deformation and distortion
[0005] like figure 2 As shown, use flexible flat cable FFC (Flexible Flat Cable) 30, because its characteristic impedance Z 0 The value is about 130Ω, which does not meet the specification standard of the LVDS signal transmission line 15, and is not suitable as the LVDS signal transmission line 15 between the LCD interface 10 and the system motherboard interface 20

Method used

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  • Characteristic impedance 85-115 omega flexible line structure
  • Characteristic impedance 85-115 omega flexible line structure
  • Characteristic impedance 85-115 omega flexible line structure

Examples

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Embodiment 1～11

[0038] The technical solutions provided by the present invention are further described below in conjunction with the examples. The characteristic impedance Z of Examples 1-11 and Comparative Examples 1-2 0 , are measured using "Time Domain Reflectometry" (Time Domain Reflectometry; TDR), and, Examples 1 to 11 all use the four-layer laminated structure flexible cable 40 with a single-sided metal shielding layer 44 of the present invention, wherein the metal The shielding layer 44 is made of CI-2650 Silver Conductive silver metal produced by Taiwan Yibi Technology Co., Ltd.

[0039] The metal shielding ratios φ of the second conductive wire layer 42 in Examples 1 to 11 are 75%, 65%, 41%, 23%, 14.3%, 13.5%, 11.3%, 7.9%, 6.9%, and 5.8%, respectively. and 4.0%. The results are shown in Table 1 and Table 2.

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Abstract

The invention relates to a soft drop-out line structure with characteristic impedance of Z085-115 ohm, the structure includes insulating layer, electric wire layer, insulating layer and metal masking layer. The metal masking layer has several hollow out units with the same shape, the metal entity part of the metal masking layer has a good masking effect to the tin plated copper electric wire, thus the characteristic impedance Z0 can be changed, when the area of the metal entity masked by the metal masking layer, the area of the tin plated copper electric wire masked reach 4%-12%, the characteristic impedance Z0 is 85-115 ohm, it can satisfy the demands that the characteristic impedance Z0 must uses 100 ohm standard.

Description

technical field [0001] The invention is a flexible flat cable FFC specially used for LVDS interface, especially a flexible flat cable coated with a metal shielding layer and having a characteristic impedance of 85-115Ω. Background technique [0002] Please refer to the attached figure 1 At present, the signal transmission interface used between the liquid crystal display LCD and the system motherboard adopts a low-voltage differential signal receiver LVDS (Low Voltage Differential Signal) with ultra-high-speed 1.4Gb / s, low power consumption, and low electromagnetic radiation characteristics. Signal transmission interface. [0003] Therefore, according to the LVDS interface standard defined by ANSI / TIA / EIA-644-1995, the LVDS signal transmission line 15 specification applied between the LCD interface 10 and the system motherboard interface 20 must have a characteristic impedance of 100Ω (Z 0 , Characteristic Impedance), can be connected with the circuit impedance Z of LCD in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/04H01B7/17H01B11/06
Inventor 洪升立
Owner P TWO ELECTRONICS SHENZHEN
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