| 摘要 |
An apparatus for combined capacitance and pressure touch sensing is described. The apparatus includes a touch panel (29), and a front end module (3). The touch panel includes a layer structure (5; Fig.15) including one or more layers, each extending perpendicularly to a thickness direction, the layers including a layer of piezoelectric material (10; Fig.15), the layer structure having first (6) and second (7; Fig.15) opposite faces, and the layer(s) arranged between the first and second faces such that the thickness direction of each layer is perpendicular to the first and second faces. The touch panel also includes a plurality of first electrodes (8) disposed on the first face, each first electrode connected to a respective input of the multiplexer (75) having a plurality of inputs (76) and an output (F). The touch panel has at least one second electrode (9) disposed on the second face. The front end module receives an input signal (n) from the multiplexer output, and includes a first stage (12) to provide an amplified signal based on the input signal, and a second stage including first (13) and second (14) frequency-dependent filters configured to receive the amplified signal and to provide respective first (16) and second (17) filtered signals. The first filtered signal has a first frequency bandwidth, and the second filtered signal has a second frequency bandwidth which has a relatively higher start-frequency than the first. An associated method of fabricating a panel having first, second and third electrodes, a transparent substrate, a dielectric substrate and a piezoelectric substrate with particular arrangement is also claimed. |
