Patent application number | Description | Published |
20080211749 | Method for Grayscale Rendition in Am-Oled - 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. | 09-04-2008 |
20080224960 | Image Display Screen and Method for Controlling Said Screen - The invention relates to an image display screen including:
| 09-18-2008 |
20080272993 | Device for Displaying Images on an Active Matrix - The invention relates to an active-matrix display device which comprises:
| 11-06-2008 |
20080278461 | Method for detecting a flexion exerted on a flexible screen and device equipped with such a screen for implementing the method - 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. | 11-13-2008 |
20090009504 | Method of Driving a Display Panel with Depolarization - 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. | 01-08-2009 |
20090015575 | Method for Controlling a Display Panel by Capacitive Coupling - 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. | 01-15-2009 |
20090021457 | Method for Displaying an Image on an Organic Light Emitting Display and Respective Apparatus - 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). The data signal of a cell comprises plural independent elementary data signals wherein each of the elementary data signals is applied to the cell during a sub-frame and the grayscale level displayed by the cell during the respective group of sub-frames depends on the amplitude of the elementary data signals and the duration of the sub-frames. With this concept, a flicker-free and a very high level of motion rendition can be offered. | 01-22-2009 |
20090184900 | Image display device and display device control method - 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. | 07-23-2009 |
20090206764 | Driver for Controlling a Light Emitting Element, in Particular an Organic Light Emitting Diode - 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. | 08-20-2009 |
20100020056 | Display Panel and Control Method Using Transient Capacitive Coupling - 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. | 01-28-2010 |
20100026670 | Display device and uses thereof - 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. | 02-04-2010 |
20100084635 | Recording level gauge type organic light emitting diode - Diode for which one of the conducting layers presents a suitable surface resistance so that when a power supply voltage is applied between a connection element and this conducting layer and the other conducting layer, a potential distribution is generated at the surface of this resisting conducting layer which is able to cause light to be emitted by a portion of the surface of the organic light emitting layer which is proportional to this power supply voltage. This diode is advantageously used to visualise the signal value. | 04-08-2010 |
20100127245 | Transmitter and associated display device - The invention relates to a light transmitter comprising two electrodes facing each other, and at least one light-emitting organic layer with two ends. The thickness of the organic layer varies continuously between the two ends. The invention also relates to a display device comprising such a transmitter. | 05-27-2010 |
20100194790 | Set of light emissive diode elements for a backlight device and backlight display - The invention relates to a backlight device with light emissive diodes not requiring the supply of a large current. According to the invention, each light emissive diode of the backlight device is combined with a voltage converter capable of storing energy during part of the operating cycle and then discharging this energy into the light emissive diode during another part of the cycle. | 08-05-2010 |
20130201089 | METHOD OF DRIVING A DISPLAY PANEL WITH DEPOLARIZATION - 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. | 08-08-2013 |