![]() 1,2 Conventional touch screens do not recognize pressure levels, so they cannot meet the need for accurate recognition of touch. To recognize touch more accurately, advanced touch sensors have attracted a great deal of interest. Introduction With the increasing popularity of smartphones and wearable devices, consumers are placing higher demands on human–computer interaction. Therefore, the proposed sensor has great potential in the production of flexible touch screens, human–machine interacting applications, and even electronic skins in the future. ![]() Due to the simple structure, the pressure sensor demonstrates the advantage of being inexpensive to be manufactured and holds the potential to be integrated into the display backplane. Especially, good linearity over a wide pressure range and high stability over 1000 repeated loadings were realized. The pressure sensor showed good sensitivity and reliability over a pressure ranging from 0 to 75 kPa which covers the human touch pressure range. Moreover, the sensor was fabricated on a flexible substrate and delaminated via a laser lift-off (LLO) technique to meet the urgent needs for flexibility. The shielding structure significantly improves the stability of the device. To prepare a stable sensor suitable for practical use, we designed a device structure that shields ambient noise by grounding the control gate. The pressure sensor was fabricated to work under low voltage conditions by using a high mobility amorphous indium–gallium–zinc oxide (a-IGZO) thin-film transistor (TFT) and a stretched polyvinylidene fluoride (PVDF) film. ![]() They can make static and dynamic measurements.In this study, a flexible pressure sensor with highly stable performance is presented. This requires signal conditioning for zero offset and temperature compensation and amplification to make them useful in most applications. In the silicon pressure sensor, applying several volts typically delivers an output in the millivolt range for a basic sensor. Either a constant current or a constant voltage is applied to generate an output with constant voltage being the more common approach.īoth traditional bonded and unbonded strain gauges as well as integrated silicon pressure sensors employ Wheatstone bridges. Commonly implemented in a 4-arm Wheatstone bridge, the change in resistance, ΔR, is additive in two legs and subtractive in the other two. ![]() The piezoresistive effect is used in strain gauges for measuring pressure. Underwater explosions can also be detected by piezoelectric pressure sensors. For example, microphones often use quartz crystal for transducing pressure into electricity. The electric signal generated by the crystal decays rapidly so they are not used for static measurements but for dynamic pressure measurements up to 100 kHz. Mechanical force on the material generates a charge, typically in the picocoulomb range, that is amplified and converted to voltage signal. In either case, the mechanical force or stress can be compression, tension or a bending force.Ĭeramic and quartz crystal are common piezoelectric materials for sensing pressure. In contrast, the piezoresistive effect is the property of a material’s resistivity to change when subjected to a mechanical force. Piezoelectric is the property of a material to generate a voltage when mechanical force is applied to it. ![]()
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