Abstract: The invention concerns a display screen with active matrix comprising first and second transparent substrates enclosing a crystal liquid material, at least one counter electrode, pixel electrodes in lines and in columns, data lines, perpendicular selection lines, control devices for connecting the lines to the pixel electrodes, the pixel electrodes being controlled such that the electrodes connected to a common selection line have the same polarity while, for two adjacent selection lines the polarity is reversed, the pixel electrodes being located in a first plane while the other elements are located in a second plane distanced from the first plane, and a transparent mass plane being located between the two planes. Moreover, the mass plane has a structure such that at least the part found between two pixel electrodes of same polarity is recessed. The invention is applicable to LCD.

Abstract: A compensation process for a circuit comprising at least one first conductor at a specified potential, at least one second conductor generating disturbances by capacitive coupling to the conductor and at least one disturbance compensation bus capacitively coupled to the first conductor by a first capacitor includes the steps of measuring the voltage and the current on the compensation bus, calculating the voltage on the first disturbed conductor, and determining the set-point voltage to be applied to the compensation bus in order to compensate for the disturbance.

Abstract: A device for attenuating stray capacitances in a liquid crystal and active matrix screen. The screen includes a substrate plate on one face of which there are deposited electrodes and thin film components controlling the electrodes. It also includes a back plate having one or more back-plate electrodes and covering the face of the substrate plate. A liquid crystal is contained between the electrode of the substrate plate and the back-plate electrodes. A ground plane forms an equipotential over the whole surface of the screen between the substrate plate and the thin films of the control components. The ground plane along with a film of insulating material forms a storage capacitance.

Abstract: A device for encapsulating and passivating integrated control circuits of flat screens. A sealing bead is placed on a substrate plate in order to encapsulate and passivate an integrated control circuit mounted on the plate. In one embodiment, the sealing bead is placed directly on top of the control circuit. In a second embodiment, the sealing bead is placed on both sides of the circuit so as to form a chamber which is separate from that which contains the active matrix. In a third embodiment, an opaque material is also placed on top of the circuit which acts as a spacer and may also act as a "black matrix".

Abstract: A device for improving a contrast of a liquid crystal screen by using an opaque mask. The display screen includes a first plate, on one face of which are deposited elements with controlled transparence or reflectance and thin film components controlling these elements, and a back plate covering a face of the first plate including the elements with controlled transparence or reflectance and the thin film components. The elements are separated by opaque bands into lines and columns forming a grid. The opaque bands are deposited at least partially on the plate including the elements and the thin film components.

Abstract: This invention concerns active matrix flat displays in which the pixels (10) are placed at the intersections between two mutually-perpendicular sets of conductors known as lines (L1 to LN) and columns (C1 to CM). In the invention, each pixel consists of two capacitors (CON1, CON'1) connected in series and consisting of electro-optical components, this circuit being connected between two control transistors (T1, T'1), these two transistors being connected to a common line (L1) and two different columns (C1, C'1) respectively.