Thomson-csf

Thomson-lcd

Thomson Consumer Electronics Inc.

Thomson Consumer Electronics S.a.

Thomson Grand Public

Thales Avionics Lcd S.a.

Bruno Mourey

Michel Hareng

Jean N Perbet

Jean-Claude Lehureau

Jean-Pierre Le Pesant

Serge Le Berre

Jean-Noel Perbet

Bernard Hepp

Jean P Le Pesant

Roger Green Stewart

Jean-Pierre Huignard

Jean Claude Dubois

Hugues Lebrun

Philippe Robin

Thierry Kretz

Eric Sanson

Henriette Magna

Jean-Pierre Herriau

Robert Hehlen

Francois Boulitrop

Lydie Thirant

Eric Chartier

Michel Graciet

Pierre Aigrain

Hughes Lebrun

Nicolas Szylo

Patrick Truffer

Michel DeFrance

Eric Benoit

Antoine Dupont

Pascal Royer

Maurice Le Galguen

By Bernard Hehlen, Legal Representative

By Philippe Hehlen, Legal Representative

Robert Hehlen, Deceased

The present invention relates to a process for displaying data on a matrix display consisting of N data lines and P selection lines at the intersections of which are situated the image points or pixels. The N data lines are grouped into {dot over (P)} blocks if N' lines where N={grave over (P)}&#xd7;N&#x2032;. Each block receives in parallel one of the P&#x2032; data signals which is demultiplexed on the N&#x2032; lines of the said block. The scanning of the N&#x2032; data lines of a block is carried out from 1 to N&#x2032; or from N&#x2032; to 1, alternately, according to the selection lines.

Method and apparatus for displaying data on a matrix display with an alternating order of scanning in adjacent groups of columns

The present invention relates to a method for addressing a flat screen composed of lines and columns, with pixels located at their intersections, characterized in that, at the start of each sampling of the video signal to be displayed on the screen, a voltage (Vr) higher than the working voltage range (V) is applied to the selected pixel for a time tr, then the working voltage is sampled for a time ts.

Method and apparatus for driving flat screen displays using pixel precharging

A liquid crystal display device includes first and second transparent substrates spaced from one another and having facing surfaces with a liquid crystal material between the facing surfaces. A transparent electrode overlays the facing surface of one substrate. The facing surface of the other substrate supports: (a) a matrix of pixel electrodes (b) a plurality of data lines extending in a first direction, (c) a plurality of select lines extending in a second direction and crossing the data lines at crossover points, (d) a plurality of solid state switching devices for electrically connecting the data lines to the pixel electrodes. The pixel electrodes lay in a first plane while the data lines and the select lines lay in at least one other plane spaced from the first plane. A conductive transparent shield extends between the first plane and the other plane.

Shielded pixel structure for liquid crystal displays

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.

Active matrix flat display

Disclosed is a method for the addressing of each column of a matrix type LCD panel consisting in the production of a pulse to control a driver transistor of said column, said pulse having a duration determined by the value of the video signal sample at input, said pulse acting on the conduction state of said transistor to connect said column to a supply terminal where a voltage gradient develops. According to the method two pulse durations, the sum of which is predetermined, are alternated and, in order that a given value of a video signal sample may produce the same optical effect from one period to the next one, differentiated excitation voltages are applied to at least one of the electrodes sandwiching the liquid crystal layer, namely said column and its counter-electrode. Application notably to active matrix LCD panels.

Method for addressing each column of a matrix type LCD panel

Disclosed is a color matrix screen with colored filters in a triad or delta layout. In this layout, the pixels are formed by two adjacent sub-pixels that are aligned along the lines and columns of the matrix, the colored filters of the lines n (n may be odd or even) being arranged according to the sequence A,A, B,B, C,C and the colored filters of the lines n+1 being arranged according to the sequence C,C, A,A, B,B where A,B,C is any combination of red, green, blue with the offset of a sub-pixel at each end of the line, and wherein each column is constituted by two parallel column elements connected to each other at each end, two adjacent sub-pixels of a line with colored filters of a same color being each connected to a different column element Application to liquid crystal screens.

Color matrix screen with colored filters in a triad or delta layout with

The disclosure relates to color image display devices in which the light is modulated spatially by a liquid crystal display screen, and is designed to improve the luminous efficiency and resolution of the color image in display devices of this kind. The disclosed display device includes a light source and a liquid crystal display screen. Each cell of the liquid crystal display screen has means to modulate the two orthogonal polarizations of light independently of each other.

Device for the display of color images

A device for optically reading a recording medium is provided, in which a polarization beam separator includes a transparent plate having a phase network associated with a birefringent material, the refraction index of this material having a first refraction index for the polarization of an incident beam and a second refraction index for the polarization of a reflected beam. Thus, in accordance with the embodiment, the detection devices are placed substantially along the emission axis of the optical source.

Device for optically reading optical recording medium

In a device for the projection of images by means of liquid crystal panels, the two orthogonal components of light are used to build the image to be projected, thus giving a significant improvement in efficiency. To this end, before going through a liquid crystal panel, the light is separated into two beams having different directions as a function of their polarization, by means of a phase separator and then, after having undergone a phase modulation by the liquid crystal panel, these two beams are recombined to build the image given by the liquid crystal panel.

Device for the projection of images

A control method and control circuit for an electro-optic matrix screen wherein: a) during a frame time period, and during the control of certain lines, the screen is controlled by voltages of a determined polarity; b) during the same frame time period, and during the control of the other lines, the screen is controlled by voltages of reverse polarity; and c) during the following frame time period, the control voltages is reversed. An inverter control circuit C.INV enables the inversion of the voltages given by input circuits INV, IN, ADD.C to the column electrodes, and by an addressing circuit ADD.C to the line electrodes. The invention can be applied to the control of liquid crystal display panels to eliminate display faults.

Method for the control of an electro-optical matrix screen and control

In a method of construction of an electrooptical display screen and especially a liquid-crystal screen, a control point of an image element is provided with a coupling element of ferroelectric material between an electrode and a control lead.

Electrooptical display screen and a method of fabrication of said screen

The device of the invention comprises mainly a liquid crystal screen illuminated by a light source. An electrically controlled modulating device is placed between the source and the screen. Depending on the desired illuminating intensity, the electrical signal will be adapted to the modulating device. The modulating device may comprise essentially a liquid crystal cell.

Device for the modulation of the illuminating light of an electro-optic

In a device for switching a light beam, the conditions of propagation of the beam are modified locally under electric control by interposing on the beam path a fluid which modifies the conditions of refraction of the medium traversed by the beam.

Device for optical switching by fluid displacement and a device for the

The present invention concerns a device where the commutation of a luminous beam is ensured by the electrically controlled presence or absence, on the path of the beam, of a fluid causing said beam to be transmitted or reflected. The invention provides for improved decoupling between the output channels of the device, due to the presence of a surface provoking a total internal reflection that allows one to eliminate interference reflections.

Electrically controlled optical switching device

In a method of fabrication of non-linear control elements for a flat display screen of the liquid crystal type, successive layers of n.sup.30 doped amorphous semiconductor, of undoped amorphous semiconductor and of metal are deposited on a substrate, whereupon the control elements are formed by masking and etching. The flanks of the control elements are then isolated, whereupon the electrodes and control leads are formed by deposition and etching.

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Voiron, France

Bruno Mourey