An organic electroluminescent device comprises a pair of electrodes, and a layer structure provided between the pair of electrodes and including a charge transport layer capable of transporting electrons or holes and an emission layer comprising a major proportion of an organic material capable of emitting light on application of a voltage thereto via the pair of electrodes. A deep trench with a sidewall in a doped semiconductor substrate is formed. At least a given one of the scan cells of the scan chain comprises multiplexing circuitry configured to select one of multiple data lines of the scan cell for application to a functional output of the scan cell. The power distribution unit includes an inter-axle differential capable being placed in a locked condition by the clutching device and of accommodating a rotational difference between a first output gear and a second output gear with the inter-axle differential.