Process for controlling a matrix access display device

DETAILED DESCRIPTION To overcome this disadvantage, the invention provides a process for controlling the display device in which the electric field controlling the electro-optic material is generated from a DC voltage transformed into an AC voltage by switching the potentials of the electrodes applying the electric control field.
A particular configuration of the display device or an electronic switching system allows the process to be implemented.
The invention provides then a process for controlling a display device comprising an active material layer reacting to a combined thermal and electric effect, the device comprising a first and a second electrode networks, these networks being crossed so as to provide matrix addressing of the device, the electrodes of the first network allowing zones of said layer to be heated successively, electric control fields being applied to said zones during cooling thereof for a predetermined time by electrodes surrounding said layer, said electric fields being generated from DC control voltages called video voltages, wherein in order to remove any DC component from the electric fields applied to said layer, the electrodes for applying said fields are brought to potentials such that said electric control fields are directed alternately in one direction then in the opposite direction.