Design Guide



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Design Guide

Material used : Silicone rubber
Function :Establish contact between the LCD & PCB .
All elastomeric inter-connectors are 'custom made' Zebra connectors offer a wide variety of application possibilities. Unlike other connectors, they do not entail soldering to make reliable connections. They require a minimum of installation hardware considerations, allowing for very small packaging structures to support low profile display and microelectronic interfacing.
When properly dimensioned, long-life performance can be assured and airtight connections without additional precautions can be realized.


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PITCH OF INTER-CONNECTOR(P)

  • More than three (3) conductive contacts per electrode of PCB/LCD.
  • Distance from center-center of each conductor in a connector
  • Alternate layers of insulation width (i) & conductor width (c) silicone material evenly spread over the entire length of inter-connector.
  • e.g. Pitch (0.1 mm) = i (0.05 mm) + c (0.05 mm)
  • Basically, 2 conductors per electrode are often adequate, but 3 conductors per electrode are always recommended to ensure reliable connections and to eliminate "intermittent contact"
  • e.g. LCD pitch = 1.2 mm (with contact pad 0.6 mm)
    Inter-connector pitch = 0.18 mm is recommended"

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Pitch Application
0.18 mm [standard] Simple segment LCD
Fine pitch 0.1mm Dot matrix LCD
Very fine pitch 0.05 mm Graphics LCD
Finest pitch 0.03 mm Graphics LCD in high requirement
The number of conductors per inch = pitch
Conductors per inch Pitch (mm) Pitch (in inch)
141 0.18 0.007"
254 0.1 0.004"
508 0.05 0.002"

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INTER-CONNECTOR - LENGTH(L)

  • L > Length of LCD pads : ±0.2mm or above
  • The overall length is recommended to be extended a min. of 0.5mm beyond the edge of the contact at each end of the connector.

 

INTER-CONNECTOR - WIDTH(W)

  • W ≤ width of LCD ledge.
  • Its design is critical in eliminating buckle when clamping force is applied to the connector.
  • If the buckle is too severe, contact shall lost completely.
  • If connector width is too thin, it may require holder to facilitate assembly, prevent accidental side contact & eliminate alignment problems.

 

INTER-CONNECTOR - UNCOMPRESSED HEIGHT(H)

  • Connector height is determined by the separation distance between LCD & PCB, including tolerance variations.
  • It is critical to calculate the correct compression ( deflection rate ) to be applied to the connector for reliable connections.
  • Compression ( deflection rate ) to be applied to connectors varies with different types, dimensions of inter-connectors.
  • Generally speaking, compression set for inter-connector is ~ 10 - 15%
  • Guideline for reference :
    • H < 6 mm, ~ 15% compression of connector's height
    • 6 mm < H < 10 mm, ~ 13% compression of connector's height
    • ≥10 mm, ~ 10% compression of connector's height
    • X = n / 1 - p Formula to determine the uncompressed height of the connector

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  • x = uncompressed height
  • n = compressed height (= separation distance between LCD & PCB)
  • p = percent of desired compression

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  • Compression load should be spread evenly over the top surface of the inter-connectors.
  • To avoid bending, we recommend to use holders especially for tall height inter-connector.
  • Holder should give space for horizontal expansion of the inter-connector during compression.

5-design-guideline-holder-1-600x253


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CONDUCTIVE CORE WIDTH(YL)

  • Conductive width is important in determining the cost, resistance and hardness of the connector.
  • For connector width > 1.3 mm, the more conductive material a connector contains, the more expensive it is.
  • Standard core width = 0.6 mm

APPLICATIONS

DESIGN GUIDE


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  • Pitch (P): More than three (3) conductive contacts per electrode of PCB/LCD
  • Length (L) : + 2mm or above
  • Uncompressed Height (H) : Distance between LCD & PCB +10-15% compression rate
  • Width (W) : determined by the width of LCD ledge

SPECIFICATION