Fig. 5

Time response of the drain current to a slight touch with an object. The variation of the drain current in an OTFT in the fingertip-shaped OTFT array was detected in relation to a vertical displacement of Δ h under V _GS = −30 V and V _DS = −30 V. The observed drain current in the OTFT increased during the application of the displacement, and the drain current difference during the compression clearly depends on Δ h. d Location map of the OTFT array and contact area with micrometer rod. The dotted circle indicates the direct contact area of the OTFT array with the micrometer rod. The (S8, GD3) pixel is directly under the rod, the (S18, GD4) pixel is far from the contact area, and the (S6, GD3) pixel is near the contact area