Patent ID: 8259035

Claim:
A display device including: (a) a display cell that includes i. a bottom substrate; ii. a transparent top substrate; iii. a frame sealing the substrates to define a closed cavity in which there is a substance, wherein optical properties of the substance change in the presence of an electric field; and iv. a matrix of electrodes arranged in lines and columns inside the cavity to define display cell pixels; (b) a matrix control circuit for the lines and columns for displaying data on the display cell, wherein in complete display mode all of the lines and columns are addressed at several voltage levels by successive line-by-line multiplexing, wherein in low power partial display mode, at least one first group of lines is connected so as to be controlled by the same line control signal from the matrix control circuit, and wherein the lines of an active zone of the display cell and the first group of lines are addressed simultaneously by an active addressing technique at two voltage levels, wherein a first voltage level defines logic level 0 and a second voltage level defines logic level 1, wherein the second voltage level is higher than a threshold voltage of the display device, and the second voltage level is less than two times higher than the threshold voltage.