Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane. In some examples, there is a dielectric stack between the first electrode and the second electrode and flexible membrane. The dielectric stack design minimizes drift in the membrane collapse voltage. In other examples, one of the electrodes is in the form of a ring, and a third electrode is provided to occupy the space in the center of the ring. Alternatively, the first and second electrodes are both in the form of a ring and there is a support between the electrodes inside the rings.

Abstract: An intraluminal ultrasound imaging device includes a flexible elongate member configured to be positioned within a body lumen of a patient. An ultrasound imaging assembly is disposed at the distal portion of the flexible elongate member. The ultrasound imaging assembly includes a plurality of acoustic elements and an acoustically-transparent window disposed over the plurality of acoustic elements. The acoustically-transparent window comprising a plurality of layers formed on top of one another. The plurality of layers includes an innermost layer directly contacting the plurality of acoustic elements, an outermost layer opposite the innermost layer, and an adhesive layer. The outermost layer includes a tubing. A hardness of the innermost layer is less than hardnesses of every other layer of the plurality of layers. A hardness of the outermost layer is greater than the hardnesses of every other layer of the plurality of layers.

Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane.

Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane. In some examples, there is a dielectric stack between the first and second electrodes. The dielectric stack design minimizes drift in the membrane collapse voltage. In other examples, a voltage supply coupled to an ultrasonic array compressing the CMUT cells is adapted to provide a sequence of voltage profiles to the electrodes of the CMUT cell, wherein each profile includes a bias voltage and a stimulus voltage, and wherein a polarity of each subsequent voltage profile in the sequence is opposite to the polarity of the preceding profile. In another example, there is a capacitance sensing circuit provided, which is arranged to determine a drift voltage of the CMUT cell.

Abstract: An ultrasound transducer array is provided that comprises a plurality of CMUT (capacitive micromachined ultrasound transducer) cells (100), each CMUT cell comprising a substrate (300) carrying a first electrode (110) of a first electrode arrangement, the substrate being spatially separated from a flexible membrane including a second electrode (120) of a second electrode arrangement by a gap (130), at least one of the first electrode and the second electrode being electrically insulated from said gap by at least one dielectric layer (311, 313), wherein at least one of the first electrode arrangement and the second electrode arrangement is partitioned into a plurality of sections interconnected by respective fuse portions (112, 122). An ultrasound probe and an ultrasound system comprising such an ultrasound transducer array are also disclosed.

Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane. In some examples, there is a dielectric stack between the first and second electrodes. The dielectric stack design minimizes drift in the membrane collapse voltage. In other examples, a voltage supply coupled to an ultrasonic array compressing the CMUT cells is adapted to provide a sequence of voltage profiles to the electrodes of the CMUT cell, wherein each profile includes a bias voltage and a stimulus voltage, and wherein a polarity of each subsequent voltage profile in the sequence is opposite to the polarity of the preceding profile. In another example, there is a capacitance sensing circuit provided, which is arranged to determine a drift voltage of the CMUT cell.

Abstract: An intraluminal ultrasound imaging device includes a flexible elongate member configured to be positioned within a body lumen of a patient. An ultrasound imaging assembly is disposed at the distal portion of the flexible elongate member. The ultrasound imaging assembly includes a plurality of acoustic elements and an acoustically-transparent window disposed over the plurality of acoustic elements. The acoustically-transparent window comprising a plurality of layers formed on top of one another. The plurality of layers includes an innermost layer directly contacting the plurality of acoustic elements, an outermost layer opposite the innermost layer, and an adhesive layer. The outermost layer includes a tubing. A hardness of the innermost layer is less than hardnesses of every other layer of the plurality of layers. A hardness of the outermost layer is greater than the hardnesses of every other layer of the plurality of layers.

Abstract: Disclosed are systems and methods of operation for capacitive radio frequency micro-electromechanical switches, such as CMUT cells for use in an ultrasound system. An RFMEMS may include substrate, a first electrode connected to the substrate, a membrane and a second electrode connected to the membrane. In some examples, there is a dielectric stack between the first electrode and the second electrode and flexible membrane. The dielectric stack design minimizes drift in the membrane collapse voltage. In other examples, one of the electrodes is in the form of a ring, and a third electrode is provided to occupy the space in the center of the ring. Alternatively, the first and second electrodes are both in the form of a ring and there is a support between the electrodes inside the rings.

Abstract: An ultrasound transducer array is provided that comprises a plurality of CMUT (capacitive micromachined ultrasound transducer) cells (100), each CMUT cell comprising a substrate (300) carrying a first electrode (110) of a first electrode arrangement, the substrate being spatially separated from a flexible membrane including a second electrode (120) of a second electrode arrangement by a gap (130), at least one of the first electrode and the second electrode being electrically insulated from said gap by at least one dielectric layer (311, 313), wherein at least one of the first electrode arrangement and the second electrode arrangement is partitioned into a plurality of sections interconnected by respective fuse portions (112, 122). An ultrasound probe and an ultrasound system comprising such an ultrasound transducer array are also disclosed.

Abstract: The invention relates to a light source (1) comprising a light generating unit (2) like an organic light emitting diode and an outcoupling device (3) for coupling light out of the light generating unit in an outcoupling direction (4). The outcoupling device comprises a first region (5) for facing the light generating unit, a second region (7) having a refractive index being smaller than the refractive index of the first region, and a structured intermediate region (6) between the first region and the second region. The first region is optically homogenous and has a thickness in the outcoupling direction being larger than a coherence length of the light, thereby reducing generally possible wavelength dependent interference effects and, thus, a corresponding degradation of the outcoupling efficiency. The outcoupling efficiency can therefore be increased.

Abstract: A triphenylene derivative useful for the production of organic light emitting diodes.

Abstract: The invention relates to the field of organic electronic devices (1) with diffusion barriers and to a method to manufacture such organic electronic devices (1) to provide an organic electronic device (1) with excellent performance, which is as stable as possible over time. The organic electronic device (1) with a substrate (2), a first electrode (3) arranged on top of the substrate (2) and a functional layer stack (FLS) arranged on top of the first electrode (3) comprising one or more organic layers (41, 42, 43) and a second electrode (5), wherein the organic electronic device (1) further comprises at least one essentially transparent and electrically conductive graphene layer (6) arranged in contact to at least one of the organic layers (41, 42, 43) acting as a diffusion barrier against diffusion of atoms, ions or molecules into this organic layer (41, 42, 43).

Abstract: The present invention relates to a method of manufacturing a light emitting device with improved internal out-coupling by providing an intermediate layer (11) with a modulated surface. This is achieved by exposure of a flat glass surface (100) to a saturated etching fluid or by providing local changes in the chemical surface composition of the glass substrate or by depositing locally separated sub-?m particles. By removal of the etching fluid, either ultrafine particles (12) are deposited or defects are generated consisting of glass component areas of sub^m-size extension with a high sticking coefficient with respect to the species deposited later on from the gas phase.

Abstract: The invention relates to the field of organic electronic devices (1) with diffusion barriers and to a method to manufacture such organic electronic devices (1) to provide an organic electronic device (1) with excellent performance, which is as stable as possible over time. The organic electronic device (1) with a substrate (2), a first electrode (3) arranged on top of the substrate (2) and a functional layer stack (FLS) arranged on top of the first electrode (3) comprising one or more organic layers (41, 42, 43) and a second electrode (5), wherein the organic electronic device (1) further comprises at least one essentially transparent and electrically conductive graphene layer (6) arranged in contact to at least one of the organic layers (41, 42, 43) acting as a diffusion barrier against diffusion of atoms, ions or molecules into this organic layer (41, 42, 43).

Abstract: The present invention relates to a method of manufacturing a light emitting device with improved internal out-coupling by providing an intermediate layer (11) with a modulated surface. This is achieved by exposure of a flat glass surface (100) to a saturated etching fluid or by providing local changes in the chemical surface composition of the glass substrate or by depositing locally separated sub-?m particles. By removal of the etching fluid, either ultrafine particles (12) are deposited or defects are generated consisting of glass component areas of sub?m-size extension with a high sticking coefficient with respect to the species deposited later on from the gas phase.

Abstract: An electroluminescent device (9) for emitting light (7) whose color point is able to be set variably, comprising at least two electroluminescent regions (41, 42) that, to allow the same operating voltage to be applied, are arranged to be connected in parallel electrically, wherein the electroluminescent regions (41, 42) comprise—at least one first electroluminescent region (41) of a first electroluminescent material for emitting light in a first spectral band in accordance with a first luminance vs. voltage characteristic (81), and—at least one second electroluminescent region (42) of a second electroluminescent material for emitting light in a second spectral band that is not the same as the first spectral band, in accordance with a second luminance vs. voltage characteristic (82) that is not the same as the first luminance vs. voltage characteristic (81).

Abstract: The invention provides an OLED device with improved light out-coupling comprising an electroluminescent layer stack (2) on top of a substrate (1), where the electroluminescent layer stack (2) comprises an organic light-emitting layer stack (6) with one or more organic layers sandwiched between a first electrode (3) facing towards the substrate (1) and a second electrode (7) to apply a driving voltage to the organic light-emitting layer stack (6), and a first electron transport layer stack (4a) arranged between the organic light emitting layers stack (6) and the second electrode (7), wherein the electron transport layer stack (4a) comprises an electron transport layer (41) made of a first electron transport material having a low refractive index and at least one n-doped layer (40, 42). The invention further relates to a method to manufacture these OLED devices.

Abstract: The invention relates to a light source (1) comprising a light generating unit (2) like an organic light emitting diode and an outcoupling device (3) for coupling light out of the light generating unit in an outcoupling direction (4). The outcoupling device comprises a first region (5) for facing the light generating unit, a second region (7) having a refractive index being smaller than the refractive index of the first region, and a structured intermediate region (6) between the first region and the second region. The first region is optically homogenous and has a thickness in the outcoupling direction being larger than a coherence length of the light, thereby reducing generally possible wavelength dependent interference effects and, thus, a corresponding degradation of the outcoupling efficiency. The outcoupling efficiency can therefore be increased.

Abstract: A light emitting device includes several groups of stripe shaped organic light emitting diodes arranged side by side on an optically transparent carrier substrate. The organic light emitting diodes includes a first layer sequence forming a first microcavity. At least one of the organic light emitting diodes of each group includes a second layer sequence forming a second microcavity is adapted in thickness of at least one of its layers to increase light output of the corresponding organic light emitting diode. A scatter or diffuser is arranged is an emission direction of the organic light emitting diodes in front of the carrier substrate to mix the light of different colors of each group leaving the carrier substrate allowing the emission of white light with a high efficacy.

Abstract: A system related to the improvement of the design of display device screens during the off or stand-by state is provided. The system comprises a display device and a device connected to the display device, wherein the device comprises a material having a switchable optical configuration. The display device may e.g. by a TV screen, or any other display such as computer monitors.