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Apr21
Design for Flex cable(FPC) Trace Pattern

FPCMany FPCB designer are not familiar with the manufacturer process and limitation.  I always found design does not meet DFx requirement and insist on their design and finally bring lot of quality issue after mass production.

Here I ask FPCB supplier provide  some of the design for the flex cable (FPCB)  manufacturing  ability and hope it will prevent future quality fail or cost high due to yield lose.

Basically I do think designer and FPC manufacturer shall make more communication to understand each other requirement and make FPCB lower cost and higher quality and yield rate. This shall be win-win.

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Apr20
Screen-Printing on PET(PolyEthylene Terephthalate) notices

PTF_sampleThe PTF uses silk-screen to print the silver and carbon combination conductive inks on PET substitute to reach lower cost purpose as compare with FPC (Flexible Printing Circuit). Unfortunately, the screen-printing still has some ability limits. Especially that it has problem for fine trace width and fine space. This article will discuss screen-printing on PET limitation.

  • PTF: Polymer Thick Film
  • PET: Polyethylene Terephthalate
  • FPC: Flexibility Printing Circuit

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Apr20
What is PTF(Polymer Tick Film)? PTF introduction

PTF samplePolymer Thick Film (PTF) flexible circuits are manufactured by screen-printing conductive ink onto flexible substrates such as PET (Polyethylene terephthalate). It can be single layer or multi-layers circuit by further screen-printing dielectric materials as insulating layer and applying through-hole technologies.

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Apr20
What potentioal cuase make HeatSeal Connector peel off?

LCD use HSC solution and missed segment

Recently there were many missed segment defect of the HSC (Heat Seal Connector) solution LCM returned from the field. As experience tell the reliability of HSC bonding  is not so good for the industrial product. Because this cable is easily to Lose stickiness sooner and later. Finally miss the contact between the PCB and HSC after a period of use.

In order to make people understand why the HSC bonding force is not good, I collected some useful information  from HSC expert and supplier. This will help people to study the root cause and fix this kind of defect if you like.

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