Abstract: The invention relates to a display device comprising at least a light emitter, with power supply means suitable for the electrical supply for each emitter and the means of detection of irradiance of ambient light radiation. The detection means are also able to capture the ambient light radiation, to convert it into electrical energy and supply power to each emitter to increase the light level of each emitter according to the irradiance of ambient light radiation. The invention relates to any display system that undergoes illumination variations but for which the readability must be ensured such as computers, traffic lights or similar devices.

Abstract: Panel comprising display drivers which, each 1??, comprise a select switch and a clamping switch which are controlled by the same select electrode, and a coupling capacitor for transiently coupling the control terminal of this circuit C to an address electrode. A control method comprising emission periods and depolarization periods, where all the address signals have the same polarity. The invention makes it possible in particular to use conventional and inexpensive means of controlling the address electrodes.

Abstract: The present invention relates to a circuit for controlling a light emitting element, in particular an organic light emitting diode. The circuit comprises a capacitor connectable with the light emitting element, charging means for charging the capacitor and a switching means. The switching means is adapted to alternately disconnect the capacitor from the light emitting element and connect the capacitor to the light emitting element. The capacitor is alternately charged and discharged. A charging current or a discharge current from the capacitor drives the current of the light emitting element. Said charging means comprises at least one charging transistor for charging the capacitor.

Abstract: The invention relates to an active matrix image display device consisting of: several light emitters; a current modulator which is connected to each emitter; means for selecting emitters; means for powering the emitters; and an operational amplifier comprising an inverting input a noninverting input and an output. According to the invention, either the noninverting input or the inverting input of the operational amplifier is connected to the output of the power supply means such as to form, together with the modulator gate which is connected to the output of the operational amplifier, a feedback loop for the operational amplifier, when one of the emitters is selected. The invention also relates to a method of controlling one such display device.

Abstract: The invention relates to an active-matrix image display device that comprises an array of light emitters. Each light emitter is controlled by a current modulator having a particular trip threshold voltage. The device also includes compensation means for compensating for the trip threshold voltage of the modulators. These compensation means comprise at least one operational amplifier connected between the gate electrode and the source electrode of the modulator. The feedback of this operational amplifier compensates for the trip threshold voltage of at least one modulator whatever the value of the said voltage.

Abstract: The display comprises an array of pixel circuits each comprising an emitter 1 in series with a current modulation transistor, and at least one address circuit, which integrates, for each column, a differential amplifier and a passive element preferably a resistive element, which cooperate with the current modulation transistors so as to form, during address phases in which the emitters are switched “out of the circuit”, a voltage-programmable current generator. After the address phases, thanks to a suitable switch, the emitters are switched “into the circuit” and supplied with the preprogrammed current. Such a display allows the image display quality to be inexpensively improved.

Abstract: The driving of an active matrix organic light emitting display (AMOLED) shall be improved. A pulsing grayscale rendition shall be combined with an improved motion rendition when driving the AMOLED with analog signals. Therefore, there is provided a data signal which is applied to each cell of the AMOLED for displaying a first grayscale level of a pixel of the image during a first group of sub-frames for displaying at least a second grayscale level of a pixel of the image during at least a second group of sub-frames. The first group of sub-frames and the at least second group of sub-frames are constituting a video frame N. Each group of sub-frames is divided into a plurality of sub-frames. Each, the first group of sub-frames and the second group of sub-frames is belonging to a separate complete image of the display (AMOLED).

Abstract: A method comprising emission periods during which a predetermined emission voltage which presents a first polarity, is applied and sustained at the control terminal of at least one driver of said panel, and depolarization periods during which a predetermined depolarization voltage which presents a second polarity, opposite to the first polarity, is applied and sustained at the control terminal of at least one driver of said panel, the address signals of the circuits of said panel being transmitted by capacitive coupling of the address electrodes to the control terminals of these circuits. The invention makes it possible to use conventional and inexpensive means of controlling the address electrodes.

Abstract: The method comprises, in addition to emission periods, depolarization periods during which a predetermined depolarization voltage, which exhibits a polarity opposite to the polarity opposite to the voltage applied during the emission periods, is applied and sustained at the control terminal of said driver circuits of the panel, and a reference depolarization voltage, which is different from the reference emission voltage, is applied to the reference electrodes to which reference terminals of the driver circuits are linked. This method makes it possible to use conventional and inexpensive column control means.

Abstract: Present day, technology allows flexible screens to be produced, particularly the OLED screen technology. The invention relates to a device equipped with a flexible screen emitting light. Part of the light rays emitted by the optical cells is imprisoned between the substrate layers and reflecting from one layer to the other exit at the side of the screen. Photoelectric detectors are arranged on the side of the screen in order to capture the incident light. Depending on the position of the cells emitting the light and the values supplied by the detectors, the central processing unit determines the areas of flexion applied to the screen. Hence, it is possible to introduce commands by exerting flexions on certain areas of the screen. The invention also relates to a device having a flexible screen and flexion sensors capable of executing the method for the introduction of commands.

Abstract: The invention relates to an active-matrix display device which comprises: an array of light emitters, each emitter being supplied by power supply means; a current modulator having a trip-threshold voltage, said modulator being able to be addressed by applying a data setpoint to one of its terminals and a drain current being able to flow through said modulator in order to control said emitter; and trip-threshold voltage compensation means comprising a comparator for comparing the value of the drain current with the value of the data setpoint during a programming step. The power supply means for the emitters are capable of supplying the emitters during the programming step.

Abstract: The invention relates to an image display screen including: light emitters arranged as rows of light emitters and columns of light emitters, control means to control the emissions of the light emitters, including: a plurality of modulation transistors, each associated with one light emitter of the array, the said modulation transistors being positioned next to each other, along a guiding line, a plurality of compensating transistors intended to compensate for the threshold trigger voltage of the modulation transistors. A single compensating transistor is connected to all the modulation transistors of a column and is intended to compensate for the threshold trigger voltages of all the said modulation transistors of this column. This compensating transistor is formed in the extension of the said modulation transistors of a column along the same guiding line. The invention also relates to a method for driving this screen.

Abstract: The present invention relates to a grayscale rendition method in an active matrix OLED (Organic Light Emitting Display) where each cell of the display is controlled via an association of several Thin-Film Transistors (TFTs). In order to improve the grayscale rendition in an AM-OLED when displaying low grayscale levels and/or when displaying moving pictures, it is proposed to split each frame into a plurality of subframes wherein the amplitude of the data signal applied to a cell of the AM-OLED can be adapted to conform to the visual response of a CRT display. According to the invention, the video frame used for displaying an image is divided into N consecutive subframes, with N?2, and the data signal applied to the cell comprises N independent elementary data signals, each of said elementary data signals being applied to the cell during a subframe. The grayscale level displayed by the cell during the video frame is depending on the amplitude of the elementary data signals and the duration of the subframes.

Abstract: Image display screen suitable for displaying image frames, at a given screen scanning frequency, comprising, light emitters, circuits for addressing the emitters each comprising, a current modulator able to supply the said emitter with current during the screen display mode, a charge capacitance able to store at each image frame a potential applied to the gate electrode of the current modulator, the potential being representative of a voltage for addressing an image datum during a screen display mode. The screen comprises a control system able to apply a bias voltage to the gate electrode of the current modulator and to the said charge capacitance, during a screen standby mode of a duration greater than the duration of an image frame, the said bias voltage having a bias inverse to the bias of the potential applied to the said charge capacitance during the screen display mode.

Abstract: The invention relates to a colour display device with backlighting unit using organic light-emitting diodes and to a method of implementation. The colour display device comprises, from rear to front towards an observer, a multicolour backlighting unit using organic light-emitting diodes and an electro-optical array for switching of the backlighting by pixels, the backlighting unit being a surface comprising a periodic pattern of a group of at least three adjacent illuminating lines of different base colours that are parallel to each other.

Abstract: The invention relates to an image display device with active matrix comprising a number of light emitters forming a network divided into rows and columns; a current modulator for each emitter; and at least one inverse bias voltage generator. This device is characterized in that it also comprises: an inverse bias switch for each emitter, said inverse bias switch being connected, on the one hand, to each modulator and, on the other hand, to the or each inverse bias voltage generator; and control electrodes able to drive all the inverse bias switches of a row of emitters. The invention also relates to a method of driving this device.

Abstract: A video display device comprises a plurality of light emitting elements arranged in a matrix having rows and columns; a plurality of first current modulators each of which is associated to one of said light emitting elements for drawing a feed current of programmable intensity for the associated light emitting element from a circuit node associated to each of said columns; a current generator controlled by video data representative of desired luminosities of said light emitting elements for supplying a first current (IDATA)to said circuit node, the intensity of which is representative of a desired luminosity of at least one of said light emitting elements; the circuit node having a specific voltage level when the intensity supplied by said current generator is drawn from the current node by the first current modulator associated to said at least one light emitting element; a second current modulator for supplying a second current (I10) to said circuit node; a comparator having inputs connected to said circuit

Abstract: The present invention is in the field of Content protection, most particularly in cinema venues where camcorder acquisition followed by immediate illegal distribution creates important revenue losses for content owners. It is known that anti-camcorder systems using a color modulation can be circumvented by using low shutter speed in the camcorder. Today, the shutter speed is determined automatically by the camcorder as a function of the filmed video source. In automatic configurations, shutter speed self-adapts to either motion, or flicker detection, both of which taking into account brightness variations only. The proposed invention proposes a dual color/brightness modulation to defeat automatic shutter speed adjustment. For example, a color modulation at 50/60 Hz is carried out and a brightness modulation at a higher frequency 100/120 Hz is added to force the camcorder to work at a high shutter speed.

Abstract: The invention relates to an active-matrix image display device that comprises an array of light emitters. Each light emitter is controlled by a current modulator having a particular trip threshold voltage. The device also includes compensation means for compensating for the trip threshold voltage of the modulators. These compensation means comprise at least one operational amplifier connected between the gate electrode and the source electrode of the modulator. The feedback of this operational amplifier compensates for the trip threshold voltage of at least one modulator whatever the value of the said voltage.

Abstract: A process and a device for inspecting glass including the use of a laser to illuminate successive cross section planes YX of a piece of glass to be inspected by relative displacement of a light curtain formed by the illumination source. A camera detects a reflective radiation emerging from the piece of glass in an observation direction which is oblique to the plane YZ of the light curtain in order to form images on the camera which include two lines corresponding to the upper and lower faces of the piece of glass and any possible luminous points situated between these two lines which would correspond to inclusions within the thickness of the glass.