Active-Matrix Driven Flexible Pressure Sensor Array Using Oxide Thin-Film Diode

Active-matrix (AM) flexible pressure sensor is more advantageous than a passive-matrix in terms of power consumption, contrast, and crosstalk problems. Particularly, the AM platform is frequently adopted in wearable electronic systems for accurate data processing because it offers real-time interaction between humans and the external environment. Based on the above, we reported that AM driven flexible pressure sensor array integrated with an oxide thin-film diode and AgNW-coated microstructured polydimethylsiloxane sheet. The pressure sensor exhibited a high sensitivity of 0.6 Pa $^{-{1}}$ at a low-pressure regime (< 1 kPa) and a short response time of 70 ms, as well as excellent electrical uniformity and mechanical durability. Additionally, upon applying the AM operation, the pressure sensor array accurately identified the selected cell to which the pressure was applied without any sneak current, unlike the passive matrix operation. Consequently, the proposed AM driven flexible pressure sensor shows promising applicability as a building block for advanced wearable platforms.