Thin film technology was also employed in the 1960s. Once the hybrid circuit is fully populated with components, fine tuning prior to final test may be achieved by active laser trimming. The final resistor value is determined by design and can be adjusted.
The composition and dimensions of resistors can be selected to provide desired values. Planar resistors are also screen printed and included in the thick film interconnect design. One key advantage for the circuit designer is complete freedom in the choice of resistor value in thick film technology. Multi-layer thick film is a technique for further improvements in integration using a screen printed insulating dielectric to ensure connections between layers are made only where required. The use of screen printed thick film interconnect provides advantages of versatility over thin film although feature sizes may be larger and deposited resistors wider in tolerance. Is often used as the interconnecting medium for hybrid integrated circuits. The advantage of hybrid circuits is that components which cannot be included in a monolithic IC can be used, e.g., capacitors of large value, wound components, crystals, inductors. A hybrid circuit serves as a component on a PCB in the same way as a monolithic the difference between the two types of devices is in how they are constructed and manufactured. Hybrid circuits are often encapsulated in, as shown in the photo. Some hybrid circuits may contain monolithic ICs, particularly (MCM) hybrid circuits.
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A form of capacitive touch is called projected capacitive touch (or P-CAP), which allows touches to be sensed through a protective layer of glass. Other forms of touchscreens are resistive, which requires pressure to be applied to the screen surface, and optical IR, which creates and invisible grid of infrared beams across the surface of the display to detect where touches occur. These displays rely on the electrical properties of the human body to detect when and where on a display the user touches them. If you've had an Apple iPhone, then you’ve used a capacitive touchscreen. Sleek and responsive capacitive touchscreen technology is now available in select InFocus touchscreen displays.
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