I'm not familiar with a specific product, but the technology you describe could be liquid crystal. When the switch is thrown, the display changes polarity and blocks the light, just like the old LCD watches did in the 80's. Polarizing lenses work the same way. Unfortunately, when I searched the net for LCD panels, all I get is hits for computer and display technology products, not your screen product.
Don't know where to point you. Maybe someone else does. Wick? bc? Jay J? Henry?