Method and device for controlling voltage provided to a suspended particle device

A voltage controlling device for controlling voltage provided to at least one suspended particle device which comprises:

• an AC terminal adapted to receive an AC voltage at a specific frequency;
• an SPD terminal adapted to provide a selected AC voltage value to the suspended particle device
• a capacitor array including a plurality of capacitors where each capacitor in the capacitor array has a predetermined capacitance;
• a switch array, connecting each capacitor of the capacitor array to the SPD terminal such that each switch of the switch array connects one capacitor of the capacitor array to the SPD terminal;
• and
• a controller adapted to control the switches of the switch array to connect at least one of the capacitors of the capacitor array to the SPD terminal based on voltage level information, such that a plurality of distinct voltage values within a predetermined range are selectively provided to the SPD terminal.

A system of controlling voltage which comprises:

• a voltage controlling device, wherein
• the voltage controlling device includes;
• an AC terminal adapted to receive an AC voltage at a specific frequency;
• a voltage dividing device adapted to divide the AC voltage into a plurality of distinct voltage values within a predetermine range;
• a controller adapted to control the voltage dividing device to provide a selected voltage value based on voltage level information;
• an SPD terminal device adapted to receive the selected voltage value;
• and
• a suspended particle device, wherein
• the suspended particle device includes:
• a first conducting layer;
• a second conducting layer;
• an emulsion including a plurality of suspended particles, which align in a predetermined pattern when exposed to an electric field, where the emulsion positioned between the first conducting layer and the second conducting layer,
• a first connecting bus connecting the first conducting layer to the SPD terminal;
• and
• a second conducting bus connecting the second conducting layer to the SPD terminal.