Driving of electro-optic displays

A display driving system for an electro-optic display device having image regions, each image region having an active display state in which the image region is driven with an active voltage signal, including a data input for selecting image regions, comprising:

• a distributor having an input connected to the data input and having one or more distributor outputs;
• a driving assembly including one or more driver stages, each driver stage having an input connected to one of the distributor outputs and a driver stage output connected to one of said image regions for providing an active voltage signal, the active voltage signal including a first signal level for setting the image region to an active display state and a second signal level different from said first signal level and which is applied for shorter durations than said first signal level;
• a reset controller having an output providing a reset signal and connected to the driving assembly for providing in response to the reset signal at the one or more driver stage outputs the second signal level of the active voltage signal;
• and
• an output latch for latching data received via said data input, wherein the display driving system is configured such that said second signal level is applied to a given image region without varying data held in said output latch for said image region.

A display driving system for an electro-optic display device having image regions, each image region having an active display state in which the image region is driven with an active voltage signal, including a data input for selecting image regions, comprising:

• a distributor having an input connected to the data input and having one or more distributor outputs;
• a driving assembly including one or more driver stages, each driver stage having an input connected to one of the distributor outputs and a driver stage output connected to one of said image regions for providing an active voltage signal, the active voltage signal including a first signal level for setting the image region to an active display state and a second signal level different from said first signal level and which is applied for shorter durations than said first signal level;
• and
• a reset controller having an output providing a reset signal and connected to the driving assembly for providing in response to the reset signal at the one or more driver stage outputs the second signal level of the active voltage signal,
• wherein one or more driver stages have a power supply input and the driver stage is arranged to change a voltage of a power applied to the power supply input in response to the reset signal, thereby changing the active voltage signal of the one or more driver stages from the first signal level to the second signal level and back to the first signal level,
• and including a latch connected to the outputs of the distributor for latching data received via said data input, wherein one or more driver stages and the latch have a common power supply input and the one or more driver stages are arranged to reduce in response to the reset signal the voltage of the power to a minimum voltage for operation of the latch.