Abstract: Drug delivery devices and methods of controlled drug delivery to a patient are provided. The drug delivery device may include one or two microchip elements, each of which has a body portion with one or more drug release apertures in fluid communication with at least one containment reservoir. The drug release apertures are closed off by one or more reservoir caps which can be electrically activated to open the drug release apertures. The drug delivery device also includes (i) a drug formulation disposed in the at least one containment reservoir, and (ii) at least one drug-permeable membrane. In some cases, an outer housing is spaced a distance from an exterior wall of the body portion of the microchip element, the outer housing includes the at least one drug-permeable membrane, and a depot space is defined between the drug-permeable membrane and the exterior wall of the body portion of the microchip element.

Abstract: An exemplary backlight control circuit (200) includes at least one load circuit (210), a pulse width modulation integrated circuit (250), and a micro controller (260). The micro controller includes an output terminal and a plurality of analog to digital input terminals. The output terminal outputs a high level signal when the analog to digital input terminals all receive high level signals, and the output terminal outputs a low level signal when any one of the analog to digital input terminals receives a low level signal. The micro controller feeds operating states of the at least one load circuit back to the pulse width modulation integrated circuit.

Abstract: An exemplary backlight control circuit (200) includes at least one load circuit (210), a pulse width modulation integrated circuit (250), and a micro controller (260). The micro controller includes an output terminal and a plurality of analog to digital input terminals. The output terminal outputs a high level signal when the analog to digital input terminals all receive high level signals, and the output terminal outputs a low level signal when any one of the analog to digital input terminals receives a low level signal. The micro controller feeds operating states of the at least one load circuit back to the pulse width modulation integrated circuit.