Abstract
3D-electrode pixel detectors are proposed in which the bias electrodes are connected to form a strip readout on the same or opposite side of the sensor. It can provide a fast trigger and significantly increase spatial resolution in both directions. This combination is also possible with double-sided processing in planar technology. A second paper (""Dual Readout-3D Direct/Induced Signals Pixel Systems"") will cover another means of increasing spatial resolution without duplicating the complex pixel electronics.