Thales

Thales Avionics Lcd S.a.

Thomson Licensing

Thomson-lcd

Aledia

Hugues Lebrun

Bruno Mourey

Philippe Coni

Thierry Kretz

Vincent Toraille

Jean-Marc Bayot

Gérard Voisin

Philippe Chabot

Elisabeth Chuiton

Patrick Rocca

Gérard Gomez

Laurence Mulatier

Nicolas Bensaou

Chantal Hordequin

Maxime Vaillant

Didier Saluel

Jean-Charles Terrien

A display includes a plurality of electronic chips with μLEDs and an active matrix for controlling the chips, the active matrix being mounted on a transparent slide, each chip comprising a plurality of light-emitting diodes, each chip comprising a substrate comprising an electrode which is common to the μLEDs and, on the upper portion thereof, the μLEDs and their electrical control contacts. The display comprises: one or more power supply planes arranged on the upper face of a support plate; the plurality of electronic chips, first conductive elements providing the electrical connections between the common electrodes of each chip and the power supply planes; the transparent slide bearing the active matrix, second conductive elements providing the electrical connections between the electrical contacts of the electronic chips and the electrical contacts for controlling the active matrix.

Micro-LED display emitting through the active matrix

A color display device includes a matrix of light sources, each light source comprising a single micro-light-emitting diode, the light sources being of three different colors, each color pixel of the matrix comprising three sources emitting in the three different colors. In the device, the matrix is formed by a group of elementary components of identical shape, each elementary component comprising at least two light-emitting diodes emitting in one of the three spectral bands—the shape of the light-emitting diodes being either a triangle, or a quadrilateral, or a pentagon—the elementary components being assembled in threes such that their respective diodes touch one another by one of their sides, the group formed by the three sources associated with the three diodes forming a color pixel.

Colour display device comprising a mosaic of tiles of light-emitting micro-diodes

A device for backlighting a display in day- or night-vision mode includes a light guide with a cuboid shape and having an output face, and a lateral input prism having three rectangular lateral faces, at least one of the rectangular lateral faces being optically coupled to the lateral input face, and another of the rectangular lateral faces being semi-reflective; a first plurality of light emitting diodes arranged on a first carrier and configured to emit light in a first direction orthogonal to the first carrier towards one of the rectangular lateral faces; a second plurality of light emitting diodes arranged on a second carrier and configured to emit light in a second direction orthogonal to the second carrier towards another of the rectangular lateral faces; and an optical filter configured to modify the light emitted by one of the first and second plurality of light emitting diodes suitable for use in night-vision equipment.

Display lighting device with light guide edgelit by LEDs coupled to triangular prism

In a liquid crystal or OLED active-matrix screen, the power supply voltages VGON and VGOFF of the display control circuit driving the control transistors of the pixels are optimized, as a function of a measurement of the operating temperature, to conserve the display qualities of the screen at high and low temperatures and reduce the power consumed on average to produce screens for applications in a severe environment, with transistors of standard size. Circuits are provided for supplying these analog voltages from numeric values supplied by a code associated with the temperature measurement, stored or computed by a programmable circuit. Provision is made to adapt these voltages as a function of a measurement of lighting level received by the transistors of the display control circuit. The optimization extends to the power supply and reference voltages necessary to the control of the pixels, notably to the gamma reference voltages.

Active-matrix display with power supply voltages controlled depending on the temperature

A display has a graphics processor that extracts from image memory just rows that have non-zero luminance information items for the colour under consideration. For each row to be written, the processor sends to a set of N sampling and conversion circuits, at high frequency, a pattern representing the rows to be written, in the form of a succession of N bits. The N samplers successively sample these bits during the succession, to sample and block the bit of rank i in the sampling circuit of rank i, and produce a pattern of N control voltages VGon or VGoff on the rows as a function of the pattern of the received succession, while the graphics processor applies to the columns the luminance data to be written. The operation is repeated solely for the rows that have a luminance information item to be written in the colour under consideration.

LCD display with row addressing using sampling and conversion, and display method

At least one of the two rectangular conducting planes, provided to apply a voltage across the terminals of each pixel of a matrix, is supplied via two adjacent edges from individual voltage sources distributed along each of the edges. The voltage sources have different values of voltage, preferably but not necessarily varying in a monotonically increasing manner between a lower value at the end near the junction between the two edges and a higher value at the other end of each of the edges. The two edges through which the first conducting plane is mainly supplied are cut out to form electrical contact points locally isolated from one another and regularly spaced, each supplied by a respective individual voltage source. The other conducting plane may be supplied in the same way.

Electro-optical device with large pixel matrix

A video system including a sequential color liquid crystal display with a panel of pixels arranged in rows and columns, including a mechanism that controls unit brightness levels on each pixel in the panel called grey levels, each grey level corresponding to a video information received at the input. The grey level controlled on a pixel is achieved with an analog voltage that varies monotonously depending on the row associated with the pixel and/or a color to be displayed.

Sequential colour matrix liquid crystal display

An organic light-emitting display screen includes n&#xd7;m picture dots organized in a matrix with m rows and n columns. Each picture dot includes an organic diode and first and second driver circuits for the diode. Each of the first and second driver circuits includes a driving transistor connected between a reference voltage and one electrode of the diode, a switching transistor for switching a gate voltage onto a gate of the driving transistor, and a capacitor connected to the gate of the driving transistor. A circuit for addressing each of the n&#xd7;m picture dots, to control alternately and simultaneously a recovery phase on one driver circuit and a display phase on the other driver circuit of a picture dot, includes as row select lines, only m row select lines, one per row of picture dots, and/or as data lines, only n data lines, one per column of picture dots.

Organic electroluminescent display

A shift register, each stage thereof provided to drive a corresponding output line, includes an output transistor that drives the output line and an additional transistor of the same technology and of the same polarity as the output transistor. The additional transistor is connected in such a way as to be subject to bias conditions similar to the output transistor, such that the additional transistor's threshold voltage, identical at the start of life to that of the output transistor, drifts as quickly or more quickly as the threshold voltage of the output transistor. The additional transistor is used to adjust the precharging voltage of a gate of the output transistor to its conduction performance characteristics during the precharging and/or selection phase.

Field-effect transistor shift register

An integrated method of detecting an image defect in an LCD screen consists in verifying the consumption of current on a power supply bus of the image display means (row driver, column driver, counter electrode CE), during capacitive charges or discharges of the selection lines Land/or columns Col. The method comprises the integration of a current measurement chain comprising a measurement resistor Rm on the power supply bus and measurementand comparisoncircuits providing outside the screen a detection signal Sd which is processed by an external circuit for safety management.

Integrated method of detecting an image defect in a liquid crystal screen

In a method for addressing an LCD display in color sequential mode, the color frames of a received video sequence are rearranged to form a display sequence applied to the LCD display. The arrangement of the color frames in the display sequence is such that the succession of the colors of the color frames and/or the duration of the color frames is random. Such a method may find application to direct view screens.

Method for addressing an LCD display in color sequential mode

A liquid crystal matrix display includes a matrix driver delivering at least a first frame section signal and a second frame selection signal and a first write device and a second write device associated with each pixel element of the matrix, wherein one of the write devices is connected to the associated selection line of the pixel element, and the other is connected to another selection line of the matrix. The write devices have crossed sample and transfer commands, the first frame selection signal causing sampling in the first write device, and contacting of information already sampled in the second write device with the pixel element, the second frame selection signal causing sampling in the second write device, and contacting of information already sampled in the first write device with the pixel element.

Liquid-crystal matrix display

An active matrix for an organic light-emitting diode display screen, including: pixels arranged in rows and in columns, each pixel including, a pixel electrode capable of accommodating an organic light-emitting diode on the surface, and first and second current drivers connected to said pixel electrode, wherein the first and second current drivers each include a current control transistor connected between a supply voltage Vdd and said pixel electrode and at least a first switching transistor that controls a gate of said current control transistor.

Active matrix of an organic light-emitting diode display screen

In a method for addressing rows and columns in a liquid crystal display, each phase for addressing rows and columns in the display includes precharging pixels of the display before a row write, to apply a precharge voltage to all pixels. Depending on the selected black or white precharge level, the light box is either switched on permanently, or is switched on during each addressing phase immediately after the precharge or immediately after the row write. The display brightness is thus improved. The display may be of sequential color type.

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Coublevie, France

Hugues Lebrun