Display device for a portable instrument such as a watch

A display device for a portable instrument, the device including:

• at least a first transparent or semi-transparent plate arranged on a bottom element;
• and
• several cavities being formed at least in part in the first plate in the field of view of the device to display information through the plate, each cavity being connected by a respective channel through the bottom element to a tank of coloured fluid via feed means for filling or emptying each closed cavity of coloured fluid for the display of information, the feed means including at least one micropump connected to the coloured fluid tank, wherein the coloured fluid feed means include, for feeding each cavity with coloured fluid, a microvalve directly connected to the respective channel of the closed cavity to be filled with or emptied of coloured fluid, each microvalve being connected by a common outlet pipe to a micropump, which is directly connected by an inlet pipe to the tank of coloured fluid.