TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The AC signal has a frequency of 0.00 1 Hz to 1 GHz. The AC signal has a voltage amplitude of 0.01-100 V. The organic matrix has a crystalline structure. The pressure sensor further comprises switching TFT that is electrically connected to the sensor TFT, where a sensor pixel structure of the pressure sensor comprises one switching TFT and one sensor TFT. The organic matrix has a crystalline structure. The organic matrix is formed to have the crystalline structure through an annealing process which implements a temperature of 120 degrees C or higher. The substrate is a flexible substrate, where the substrate is formed of a material including polyimide. The substrate comprises flexible material. The gate insulating layer comprises a combination of an organic material and an inorganic material. When an amplitude of the AC signal applied to the gate is V(G)(amp), an amplitude of the drain current is I(D)(amp), and an average drain current value is I(D)(mean), the remnant polarization value is in proportion to a value is in proportion to a value of V(G)(amp)x I(D)(mean)/I(D)(amp), (where V(G)(amp) is amplitude of a gate bias, I(D)(mean) is average value of the drain current and I(D)(amp) denotes an amplitude of the drain current) and the pressure sensor is configured to sense the pressure by using a variation in the remnant polarization value. Preferred Method: The piezoelectric gate insulating layer comprises an organic matrix, in which piezoelectric inorganic nano-particles are dispersed, where the organic matrix comprises the piezoelectric organic material.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The piezoelectric inorganic nano-particles are gallium orthophosphate, langasite, quartz analogic crystal, barium titanate, lead titanate, lead zirconate titanate (Pb(ZrxTi1-x)O3 (where x is 0 or 1), potassium niobate, lithium niobate, lithium tantalate, sodium tungstate, zinc oxide, barium sodium niobate, leadpotassiumniobate, sodium potassium niobate, bismuth ferrite, sodium niobate, bismuth titanate, or sodium bismuth titanate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The organic matrix comprises a piezoelectric organic material. The piezoelectric organic material is poly((vinylidenefluoride-co-trifluoroethylene), poly((vinylidenefluoride-trifluroethylene-chlorofluoroethylene) or poly((vinylidenefluoride-trifluroethylene-chlorotrifluoroethylene). EXAMPLE - No suitable example given.