Abstract: A current sense resistor circuit may include a primary current sense resistor that drifts with age. A secondary current sense resistor may drift with age in substantial unison with the primary current sense resistor. A calibration resistor may not drift with age in substantial unison with the primary current sense resistor. A compensation circuit may compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. The secondary current sense resistor may be in parallel with the primary current sense resistor, except when the compensation circuit is comparing the calibration resistor with the secondary current sense resistor.

Abstract: A current sense resistor circuit may include a primary current sense resistor that drifts with age. A secondary current sense resistor may drift with age in substantial unison with the primary current sense resistor. A calibration resistor may not drift with age in substantial unison with the primary current sense resistor. A compensation circuit may compensate for aging drift in the resistance of the primary current sense resistor based on a comparison of the calibration resistor with the secondary current sense resistor. The secondary current sense resistor may be in parallel with the primary current sense resistor, except when the compensation circuit is comparing the calibration resistor with the secondary current sense resistor.

Abstract: Improved systems and methods are provided for driving a column of display elements having a parasitic capacitance. Following a light emitting phase in a row time period, the column is partially discharged. During an initial phase within a next row time period, the column of display elements is pre-charged, if a light emitting phase is to be performed within the next row time period. Otherwise, the column of display elements is further discharged if a light emitting phase is not to be performed within the next row time period.

Abstract: Improved systems and methods are provided for driving a column of display elements having a parasitic capacitance. Following a light emitting phase in a row time period, the column is partially discharged. During an initial phase within a next row time period, the column of display elements is pre-charged, if a light emitting phase is to be performed within the next row time period. Otherwise, the column of display elements is further discharged if a light emitting phase is not to be performed within the next row time period.

Abstract: The invention is based on the object of making available a control and data transmission system which uses simple components to permit current-modulated data transmission via a serial bus, and whose components can be used in a flexible way. For this purpose, the control and data transmission system (50) has a controllable bus terminating device (30) for impressing a predetermined working current into the bus (42, 44). Each subscriber (1, 2) has a D.C.-coupled transmitter (60) for generating and emitting control signals and data signals which modulate the working current, and a D.C.-coupled receiver (20) for sensing and evaluating the working current which is modulated by the control signals and data signals.