A data latch circuit 12 in a source driver 1 has DFFs 12A, 12B and 12D, which receive display data signals RGB, in synchronism with respective rising and falling edges of a clock signal SCK having a half frequency of the display data signals RGB. Due to the auxiliary conveyor, when the drugs are discharged or are redelivered to another apparatus, it is possible to control the drugs to fall down to a desired position. Control over elution of the bioactive agents occurs through a plurality of cantilever-like cover members which prevent drug elution until an endogenous or exogenous stimulus causes the cover members to open and permit drug elution. For each image frame, the graphics driver configures the IGPU to generate and down-sample a Z-buffer, creating a coarse Z-texture that contains a Z-value for each tile. Grooves and bores are in fluid communication with the depressions to allow air trapped in the off line pump cavity to be expelled to the hopper.