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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/Plastic7/29/2019 Flexible Electronics Aaa
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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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