Patent ID: 8237644

Claim:
An image display device comprising: a valve of elements arranged in rows and columns, each of said elements comprising a liquid crystal one of whose electrodes, called the mirror electrode, is controlled by a drive circuit so as to display video information relating to at least one image, a coder for coding, for each image, the video information intended to be displayed by each of the elements of the valve, the video information being decomposed into two parts, a first part corresponding to a common value shared by a group of at least two adjacent elements of the valve and a second part corresponding to a specific value, and for transmitting them to said valve, wherein said drive circuit consists in: for each element of the valve, a specific drive circuit coupled to the mirror electrode of the liquid crystal of said element and intended to store the specific value associated with the video information to be displayed by said element and to apply it to the mirror electrode of the liquid crystal of said element, said specific drive circuit comprising: a first storage capacitor for storing the specific values present on a column line of the valve and intended for said element, a first switch for connecting the column line to a first end of said first storage capacitor, the other end being connected to a fixed potential, a second switch for connecting the first end of the first storage capacitor to the mirror electrode of the liquid crystal of the element; and for each group of at least two elements of the valve, a common drive circuit coupled to each element of said group and intended to store said common value associated with the video information to be displayed by said elements of the group and to apply it to the mirror electrode of the liquid crystals of the elements of said group, said common drive circuit comprising: a single second storage capacitor for storing the common value present on the column line of the valve and intended for said group, a third switch for connecting the column line to a first end of the second storage capacitor, the other end being connected to a fixed potential, at least two fourth switches for connecting the first end of the single second storage capacitor to the at least two mirror electrodes of the liquid crystals of the elements of the group, the specific drive circuit and the common drive circuit that are coupled to one and the same group of elements controlling the liquid crystals of the elements of the group in such a way as to alternately display the specific values and the common value of the video information relating to the elements of the group for an image.