Matrix display device comprising two groups of row electrodes and two column electrodes for image element and its control process

DETAILED DESCRIPTION More specifically, the present invention relates to a matrix display device comprising an electro-optical material having an optical property inserted between first and second insulating walls, whereof at least one is transparent and which are kept spaced from one another, wherein on the inner face of the first wall are arranged n parallel row conductors, each row conductor being connected by k.
times.
m switches to k.
times.
m electrodes of a first family grouped into m groups of k parallel electrodes each and k.
times.
m electrodes of a second family grouped into m groups of k parallel electrodes each, the m groups of electrodes of the first family and the m groups of electrodes of the second family being juxtaposed with said row conductor and alternating with one another in such a way that each electrode E.
sub.
ijl of a group P.
sub.
ij of electrodes of the first family and each electrode E'.
sub.
ijl of a group P'.
sub.
ij of electrodes of the second family are connected by a switch T.
sub.
ijl to a row conductor N.
sub.
i with i, j and l being integers such that 1.
ltoreq.
i.
ltoreq.
n, 1.
ltoreq.
j.
ltoreq.
m and 1.
ltoreq.
l.
ltoreq.
k and wherein on the inner face of the second wall are arranged a first family of m parallel column conductors and a second family of m parallel column conductors, the column conductors of the second family alternating with the column conductors of the first family, one of the two families of column conductors being raised to a reference potential by a polarizing means, the column conductors of the first and second families intersecting with the row conductors, each column conductor of the first family facing n groups of electrodes of the first family and each column conductor of the second family facing n groups of electrodes of the second family, an image element being defined by the overlap zone of two column conductors respectively of the first and second families with respectively a group of k electrodes of the first family and a group of k electrodes of the second family connected by k switches to the corresponding row conductor, said conductors carrying appropriate signals for the excitation of the material emitted by the row and column control means