Abstract: The invention relates to a telephony system whose users (11, 12, 13), being provided with a simplified fixed or mobile telephone terminal devoid of a screen and a keyboard, initiate a call by merely manipulating a handset, a button or a flap in order to be connected to an operator (14) accessing to a database (15) which provides said operator with references of the calling person and instructions, their telephone contacts list and their useful medical data. Said database is updated by subscribers or authorized third parties using the Internet, electronic mail or telephone. A simplified terminal is remotely programmed, in particular to define a number to call according to the availability of operators or to adjust the ringer volume according to the time, for example. The transfer to a desired contact can be carried out by the terminal itself, which receives from the operator an instruction indicating the number to call, for example by means of voice frequencies.

Abstract: The present invention relates to a flat color display screen including a cathode associated with an electron extraction grid, an anode provided with at least two types of phosphor elements, all polarized to a same potential, and at least two additional superposed grids, positioned on the extraction grid, and each provided with holes defining sub-pixels associated with each of the colors. Each additional grid is associated with a color and some of the holes thereof are of smaller diameter than the coaxially corresponding holes of the other additional grids, for activating the sub-pixels of the corresponding color.

Abstract: A flat color microtip screen including a cathode divided into columns addressable independently; a first pixel selection grid divided into rows; a second color selection grid including a plurality of groups of slots extending along in columns, each group of three slots corresponding to a cathode column, slots of the same row of each group being connected to a same terminal; an anode including groups of three parallel bands of luminescent material, each band corresponding to one of the slots, all bands being at the same potential.