Consumer electronics devices make use of flexible circuits in cameras, personal entertainment devices, calculators, or exercise monitors.įlexible circuits are found in industrial and medical devices where many interconnections are required in a compact package. In computer peripherals flexible circuits are used on the moving print head of printers, and to connect signals to the moving arm carrying the read/write heads of disk drives. In the automotive field, flexible circuits are used in instrument panels, under-hood controls, circuits to be concealed within the headliner of the cabin, and in ABS systems. Most flexible circuits are passive wiring structures that are used to interconnect electronic components such as integrated circuits, resistors, capacitors and the like however, some are used only for making interconnections between other electronic assemblies either directly or by means of connectors. Organic light-emitting diodes (OLEDs) are normally used instead of a back-light for flexible displays, making a flexible organic light-emitting diode display. If thin flexible plastic or metal foil is used as the substrate instead, the entire system can be flexible, as the film deposited on top of the substrate is usually very thin, on the order of a few micrometres. In LCD fabrication, glass is used as a substrate. A common application of flex circuits is in computer keyboards most keyboards use flex circuits for the switch matrix. Generally worse panel utilization resulting in increased costįlex circuits are often used as connectors in various applications where flexibility, space savings, or production constraints limit the serviceability of rigid circuit boards or hand wiring.Repair and rework is difficult or impossible.Increased risk of damage during handling or use.Single-sided circuits are ideal for dynamic or high-flex applications.Potential to replace multiple rigid boards or connectors.Electrical connections where board thickness or space constraints are driving factors.Electrical connections between sub-assemblies to replace wire harnesses, which are heavier and bulkier, such as in cars, rockets and satellites.Electrical connections where the assembly is required to flex during its normal use, such as folding cell phones (dynamic application).Tightly assembled electronic packages, where electrical connections are required in 3 axes, such as cameras (static application).FPCs and FFCs have several advantages in many applications: These PET layers, typically 0.05 mm thick, are coated with an adhesive which is thermosetting, and will be activated during the lamination process. An alternative way of making flexible foil circuits or flexible flat cables (FFCs) is laminating very thin (0.07 mm) copper strips in between two layers of PET. 6 Flexible circuit industry standards and specificationsįlexible printed circuits (FPC) are made with a photolithographic technology.4.2 Double access or back bared flex circuits.
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