Abstract: An object is to prevent an operation defect and to reduce an influence of fluctuation in threshold voltage of a field-effect transistor. A field-effect transistor, a switch, and a capacitor are provided. The field-effect transistor includes a first gate and a second gate which overlap with each other with a channel formation region therebetween, and the threshold voltage of the field-effect transistor varies depending on the potential of the second gate. The switch has a function of determining whether electrical connection between one of a source and a drain of the field-effect transistor and the second gate of the field-effect transistor is established. The capacitor has a function of holding a voltage between the second gate of the field-effect transistor and the other of the source and the drain of the field-effect transistor.

Abstract: An arrangement (1) with a mobile data carrier (2) and a handheld device (4) displays driving periods, rest periods and other types of activity recorded by a tachograph and evaluated by the hand-held device (4). The hand-held device has an evaluation unit (11), a display unit (6) and an input unit. In order to minimize the outlay necessary for evaluating the periods of time, the recording data (20) stored in digital form in a memory of the mobile data carrier (2) designed as a data card (3) can be transmitted via a data transmission interface (17), to computers or notebooks in the transport company or in the vehicle of the control units, and the evaluation unit (11) determines and evaluates the driving periods and/or rest periods and/or the period of time spent in other types of activity.

Abstract: An arrangement (1) with a mobile data carrier (2) and a handheld device (4) displays driving periods, rest periods and other types of activity recorded by a tachograph and evaluated by the hand-held device (4). The hand-held device has an evaluation unit (11), a display unit (6) and an input unit. In order to minimize the outlay necessary for evaluating the periods of time, the recording data (20) stored in digital form in a memory of the mobile data carrier (2) designed as a data card (3) can be transmitted via a data transmission interface (17), to computers or notebooks in the transport company or in the vehicle of the control units, and the evaluation unit (11) determines and evaluates the driving periods and/or rest periods and/or the period of time spent in other types of activity.

Abstract: A light-weight print head having an array of LED light emitting elements positioned adjacent an apertured mask is employed to photographically record at very high speeds characters having high resolution so that they are suitable for phototypesetting. The light transmitting apertures have a cross-sectional area substantially smaller than the cross-sectional area of the LEDs and since the apertures may be very accurately positioned with respect to each other, high character resolutions are obtainable despite misalignment between the mask and the array of LEDs. A flat, lightweight, flexible ribbon of conductors is coupled between the moving scanning head and a stationary source of electrical signals. An electrically insulating, opaque filler may advantageously be employed between the LEDs.