Abstract: Matrix display device (100) having organic electroluminescent layers, successively comprising: a substrate, a first control electrode (101), a first light-emitting assembly comprising at least a first organic electroluminescent layer (104), a second light-emitting assembly comprising at least a second organic electroluminescent layer (106), a second electrode (102) that has opposite polarity to said first electrode and that is at least partially transparent with respect to the light emitted by said electroluminescent layers; said control electrode (101) being structured to form a display matrix; said device being characterized in that the product of the mean refraction index of the organic layers and the distance between the surface opposite the substrate of said control electrode (101) and the surface at the substrate side of said second electrode (102) is between 125 nm and 205 nm.

Abstract: An optoelectronic device that includes a substrate and a stack of organic layers that has at least one active layer arranged between a reflective surface and a semi-reflective surface arranged facing one another at a given distance and forming an optical cavity. The device includes at least three groups of pixels, each group of which is characterized by a cavity of a different optical length, the cavity having a number of bilayers arranged between the substrate and said stack of organic layers, each bilayer being formed of a first transparent and conductive layer of a first transparent and conductive material, and of a second transparent and conductive layer of a second transparent and conductive material, in direct contact with the first transparent and conductive layer.

Abstract: Disclosed is an electroluminescent display device (100) comprising a plurality of pixels (120) disposed on a substrate (110), each pixel being formed by one or more basic emitting zones (121a, b, c), every basic emitting zone having a base electrode (102a, b, c) disposed on said substrate (110) and an OLED stack (105) comprising an electroluminescent layer disposed on said base electrode (102a, b, c), the device (100) further comprising a common electrode (107) disposed on top of the OLED stack, said device being characterized in that: —two adjacent base electrodes (102a, 102b) belonging to two adjacent basic emitting zones (121a, b) are separated by a filler element having an insulating surface (103) which fills the zone (111) between said adjacent base electrodes (102a, 102b) and electrically insulates them from each other; at least the surface of said filler element having an insulating surface (103) in contact with the base electrodes (102a, 102b) is made of an insulating material; a separator (104) is si

Abstract: An electroluminescent visual display unit having: a matrix of electroluminescent pixels formed from pixels arranged on a substrate, in a matrix arrangement in lines and columns, each pixel being formed by an elementary emitting zone; a first control block to control a graphic and/or alphanumeric data stream that can be displayed on the matrix of pixels; a second control block to control a video data stream that can be displayed on the matrix of pixels; and a unit for generating a reference voltage, the device being characterized in that: each elementary emitting zone is connected to a static memory, addressed by the first control block, and to a dynamic memory, addressed by the second control block; the first and second control blocks for displaying data alternately or simultaneously on the same matrix of pixels.

Abstract: Displaying device comprising an emissive display and at least one controller configured to control said Mrs display, said display comprising a matrix array (100) of light-emitting pixels deposited on a substrate, each pixel (101) being formed, at least in one portion of said emissive display, of a plurality of elementary emitting zones Z, said elementary emitting zones Z comprising at least one elementary emitting zone ZA of a first group A and at least one elementary emitting zone ZB of a second group B, said device being characterised in that the ratio S of the sum SB of the areas of the elementary emitting zones ZB of the second group B and of the sum SA of the areas of the elementary emitting zones ZA of the first group A, which is defined by S=SB/SA, is lower than 0.35, preferably lower than 0.20, more preferably lower than 0.10, and even more preferably lower than 0.05.

Abstract: Matrix display device (100) having organic electroluminescent layers, successively comprising: a substrate, a first control electrode (101), a first light-emitting assembly comprising at least a first organic electroluminescent layer (104), a second light-emitting assembly comprising at least a second organic electroluminescent layer (106), a second electrode (102) that has opposite polarity to said first electrode and that is at least partially transparent with respect to the light emitted by said electroluminescent layers; said control electrode (101) being structured to form a display matrix; said device being characterized in that the product of the mean refraction index of the organic layers and the distance between the surface opposite the substrate of said control electrode (101) and the surface at the substrate side of said second electrode (102) is between 125 nm and 205 nm.

Abstract: Displaying device comprising an emissive display and at least one controller configured to control said Mrs display, said display comprising a matrix array (100) of light-emitting pixels deposited on a substrate, each pixel (101) being formed, at least in one portion of said emissive display, of a plurality of elementary emitting zones Z, said elementary emitting zones Z comprising at least one elementary emitting zone ZA of a first group A and at least one elementary emitting zone ZB of a second group B, said device being characterised in that the ratio S of the sum SB of the areas of the elementary emitting zones ZB of the second group B and of the sum SA of the areas of the elementary emitting zones ZA of the first group A, which is defined by S=SB/SA, is

Abstract: An electroluminescent visual display unit (1) having: a matrix of electroluminescent pixels (38) formed from pixels arranged on a substrate, in a matrix arrangement in lines and columns, each pixel being formed by an elementary emitting zone (225, 325, 425); a first control block (2) to control a graphic and/or alphanumeric data stream that can be displayed on the matrix of pixels (38); a second control block (3) to control a video data stream that can be displayed on the matrix of pixels (38); and a unit (4) for generating a reference voltage, the device being characterized in that: each elementary emitting zone is connected to a static memory, addressed by the first control block (2), and to a dynamic memory, addressed by the second control block (3); the first (2) and second (3) control blocks for displaying data alternately or simultaneously on the same matrix of pixels (38).

Abstract: Disclosed is an electroluminescent display device (100) comprising a plurality of pixels (120) disposed on a substrate (110), each pixel being formed by one or more basic emitting zones (121a, b, c), every basic emitting zone having a base electrode (102a, b, c) disposed on said substrate (110) and an OLED stack (105) comprising an electroluminescent layer disposed on said base electrode (102a, b, c), the device (100) further comprising a common electrode (107) disposed on top of the OLED stack, said device being characterized in that: —two adjacent base electrodes (102a, 102b) belonging to two adjacent basic emitting zones (121a, b) are separated by a filler element having an insulating surface (103) which fills the zone (111) between said adjacent base electrodes (102a, 102b) and electrically insulates them from each other; at least the surface of said filler element having an insulating surface (103) in contact with the base electrodes (102a, 102b) is made of an insulating material; a separator (104) is si

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: A pixel with variable chromatic coordinates comprises a plurality of color sub-pixels consisting of a light emitter and a color filter. The light emitters are identical and have an emission spectrum that is able to be modulated according to their supply voltage and/or current. The pixel control circuit supplies each color sub-pixel with a supply voltage and/or current dependent on the color of the sub-pixel for its emission spectrum to approximate the transmission spectrum of the associated color filter. Control means enable the application time of the supply voltage and/or current to be modified according to the color of the sub-pixel to obtain a predetermined mean luminance during a predetermined period.

Abstract: At least one of the upper electrodes of the panel is common to a plurality of diodes and comprises a first conducting layer and a second conducting layer, with a transparent insulating buffer layer interposed between these two conducting layers and which is pierced by windows that provide direct contact zones for direct contact between these two conducting layers of this common electrode, these contact zones being separate from the active zones of the diodes. Thanks to the direct contact zones between the two conducting layers, the upper electrode ensures good distribution of the current, while the intermediate buffer layer is insulating.

Abstract: The diode comprises an organic electroluminescent layer interposed between a lower electrode and a partially transparent and semireflective upper electrode, which itself comprises a transparent conducting sublayer and a current-distributing metal sublayer, for example an opaque grid. A dielectric antireflection layer is deposited on the grid to improve the emission contrast in ambient light, which grid, according to an advantageous embodiment, is designed to optimize the semireflective properties of the upper electrode, thereby improving, by an optical cavity effect, extraction of the emitted light.

Abstract: A pixel with variable chromatic coordinates comprises a plurality of color sub-pixels consisting of a light emitter and a color filter. The light emitters are identical and have an emission spectrum that is able to be modulated according to their supply voltage and/or current. The pixel control circuit supplies each color sub-pixel with a supply voltage and/or current dependent on the color of the sub-pixel for its emission spectrum to approximate the transmission spectrum of the associated color filter. Control means enable the application time of the supply voltage and/or current to be modified according to the color of the sub-pixel to obtain a predetermined mean luminance during a predetermined period.

Abstract: The invention relates to an organic light-emitting diode comprising, on a substrate, generally one lower electrode followed by a flat conductive organic layer a doped organic layer, upon which an organic light-emitting layer is placed, and an upper electrode, which is placed upon this organic light-emitting layer and which is essentially transparent to the light produced in the light-emitting layer. The lower electrode and the flat organic layer serve as a cathode. The doped layer makes it possible to use a hole-conductive material for the flat layer.

Abstract: At least one of the upper electrodes of the panel is common to a plurality of diodes and comprises a first conducting layer and a second conducting layer, with a transparent insulating buffer layer interposed between these two conducting layers and which is pierced by windows that provide direct contact zones for direct contact between these two conducting layers of this common electrode, these contact zones being separate from the active zones of the diodes. Thanks to the direct contact zones between the two conducting layers, the upper electrode ensures good distribution of the current, while the intermediate buffer layer is insulating.

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 diode comprises an organic electroluminescent layer interposed between a lower electrode and a partially transparent and semireflective upper electrode, which itself comprises a transparent conducting sublayer and a current-distributing metal sublayer, for example an opaque grid. A dielectric antireflection layer is deposited on the grid to improve the emission contrast in ambient light, which grid, according to an advantageous embodiment, is designed to optimize the semireflective properties of the upper electrode, thereby improving, by an optical cavity effect, extraction of the emitted light.

Abstract: The invention concerns a panel comprising an electroluminescent organic layer and a photoconductive layer, having sandwiched between said two layers, an intermediate layer of electrodes electrically insulated from one another. The cells of said panel are provided with memory effect which makes them particularly simple to operate; preferably, during the addressing phases, compensation operations are used. By using the openings in an intermediate opaque layer or by using semi-transparent intermediate electrodes, it is possible to adapt simply and economically, at each cell, optical coupling between the electroluminescent layer and the photoconductive layer.

Abstract: An image-display panel is described. The panel includes a one-dimensional or two-dimensional matrix of organic electroluminescent cells deposited on a substrate and grouped together in rows or columns. Light extraction elements are deposited on each row or column of cells to form an extraction layer.