Flexible Electronics Aaa

7/29/2019 Flexible Electronics Aaa

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OBJECTIVE

WHAT IS FLEXIBLE ELECTRONICS

HISTORY

Flexible circuit structures

Flexible circuit materials

Applications


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DEFINITION AND HISTORY

Flexible electronics is a technology forassembling electronic circuits by mounting

electronic devices on flexible

plastic substrates, such

as polyimide, PEEK or transparent

conductive polyester film. Additionally, flex

circuits can be screen printed silver circuits

on polyester.
http://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Plastic


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Flexible printed circuits (FPC) aremade with a photolithographic technology.

An other way of making flexible foil

circuits orflexible flat cables (FFCs) islaminating very thin copper strips in

between two layers of PET.

PATENTS ISSUED at 20th century.

In the 1947 publication "Printed Circuit

Techniques" by Cledo Brunetti and Roger W.

Curtis.


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FLEXIBLE CIRCUIT STRUCTURES

Single-sided flex circuits

Double access or back bared flex circuits

Sculptured flex circuits

Double-sided flex circuits

Multilayer flex circuits

Rigid-flex circuits

Polymer thick film flex circuits


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SINGLE-SIDED FLEX CIRCUITS

a single conductor layer made of

either a metal

can be fabricated with or without such

protective coatings as cover layers

Protective coatings are most common

practice

Used in LED glass.


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DOUBLE ACCESS

Also called as back

bared flex circuits.

a single conductor

layer but which is

processed so as to

allow access to

selected features of

the conductor pattern

from both sides.

Limited use.


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SCULPTURED FLEX CIRCUITS

a novel subset of normal flexible

circuit structures.

process involves a special flex

circuit multi-step etching method.

flexible circuit having

finished copper conductors.


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DOUBLE-SIDED FLEX CIRCUITS Two conductor layers

Can be fabricated with protective cover

layers on one, both or neither side of the

completed circuit but are most commonly

produced with the protective layer on both

sides

Its easier to make cross over connection

Many single sided circuits are built on a

double sided substrate just because theyhave one of two crossover connections


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MULTILAYER FLEX CIRCUITS More layers of conductors

The layers are interconnected by means

of plated through holes

It may or may not be continuously

laminated together throughout theconstruction except area covered with

holes.

This is accomplished by leaving

unbounded the areas where flexing orbending is to occur.


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RIGID-FLEX CIRCUITS Hybrid connection of rigid and flexible

substrate.

layers of a rigid flex are also normally

electrically interconnected by means of

plated through holes

Rigid-flex boards are normally

multilayer structures, however two

metal layer constructions are used.


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POLYMER THICK FILM FLEX CIRCUITS PTF are true printed circuits

Printed onto a polymer base film

Two or more metal layers can be

printed sequentially with

insulating layers printed between

printed conductor layers

Wide range of low power

applications at slightly higher

voltage.

Application are keyboards.


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FLEXIBLE CIRCUIT MATERIALS

Base material

Bonding adhesive

Metal foil


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APPLICATION

Flexible and folding electronic

device (such as smartphones)

Flexible solar cells which are lightweight,

can be rolled up for launch, and are easily

deployable

Organic light emitting diodes (OLEDs)

used to interconnect electronic

components such as integrated circuits,

resistor, capacitors

In computer peripherals flexible circuits

are used on the moving print head of

printer


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Documents

Flexible Electronics Aaa