39results about How to "Compensate for inhomogeneity" patented technology

The invention provides a pixel circuit. The pixel circuit includes a driving transistor and a light-emitting element which are connected in series between a first electric level end and a second electric level end, and as well a second transistor, a third transistor, a fourth transistor, a first capacitor and a second capacitor, wherein the second capacitor is connected between the control pole of the driving transistor and the second end of the light-emitting element. Threshold voltage is stored through the first capacitor, so that threshold voltage compensation of the driving transistor and the light-emitting element can be realized, and therefore, the nonuniformity of the display of the pixel circuit can be compensated. According to the above pixel circuit, the invention also provides a display device. According to the display device, a first control line and a light-emitting control line are both global lines. The invention further discloses a pixel circuit driving method.

A superconducting magnet configuration (4; 14) for generating a homogeneous magnetic field B0 in an examination volume (4b), has an interior radial superconducting main field coil (1) which is disposed rotationally symmetrically about an axis (z-axis) and an oppositely driven coaxial radially exterior superconducting shielding coil (2) is characterized in that the magnet configuration (4; 14) consists of the main field coil (1), the shielding coil (2), and a ferromagnetic field formation device (3; 18), wherein the ferromagnetic field formation device (3; 18) is located at the radially inside of the main field coil (1), the main field coil (1) consisting of an unstructured solenoid coil or of several radially nested unstructured solenoid coils (15, 16) which are driven in the same direction, the axial extent Labs of the shielding coil (2) being smaller than the axial extent Lhaupt of the main field coil (1), wherein the axial magnetic field profile (5) generated by the main field coil (1) and the shielding coil (2) during operation has a minimum of the field strength along the axis (z-axis) in the center (4a) and a maximum of the field strength on each side of the center (4a), and wherein the axial magnetic field profile (6) generated by the ferromagnetic field formation device (3; 18) during operation has a maximum of the field strength along the axis (z-axis) in the center (4a) and a minimum of the field strength on each side of the center (4a). The magnet configuration in accordance with the invention has a very simple structure.

The invention provides a pixel circuit and a driving method thereof, an array substrate and a display device, belongs to the technical field of display, and can solve the problems that the threshold voltage change of an existing driving transistor influences the brightness uniformity of an OLED (Organic Light Emitting Diode) and an AMOLED (Active Matrix / Organic Light Emitting Diode) does not emit light uniformly due to the driving voltage change of the gate of the driving transistor caused by electric leakage of a switching transistor. The pixel circuit comprises a working unit, a storage module, a driving module, a compensation module and a control module; at the initialization phase, the compensation module and the driving module are initialized under the control of a first power supply; at the data write-in and compensation phase, a data signal input end charges the storage module through the compensation module; and at the display phase, the control module is enabled, and the storage module discharges electricity to the working unit through the driving module, so that the working unit emits light, and the influence of the threshold voltage drift of the driving module on the performance of the working unit is reduced.

Provided is a system achieving uniform lighting with a three-primary-color laser. The system comprises a green semiconductor laser, a red semiconductor laser, a blue semiconductor laser, a long wave cut-off filter, a short wave cut-off filter, a neutral density filter, a first microlens array, a second microlens array and a convergent lens, wherein the front ends of the three semiconductor lasers are provided with a first collimating lens, a second collimating lens and a third collimating lens; the long wave cut-off filter is located on an output light path of the green semiconductor laser, and forms an incline angle with the output light path of the green semiconductor laser; the short wave cut-off filter is located on the output light path of the green semiconductor laser, and forms an incline angle with the output light path of the green semiconductor laser; the neutral density filter is located on an output light path of the blue semiconductor laser; the first microlens array and the second microlens array are respectively located on the output light path of the green semiconductor laser in sequence and behind the short wave cut-off filter; the convergent lens is located behind the second microlens array, and on the output light path of the green semiconductor laser.

The invention relates to a filter element for a fluid stream flowing in at the front side, in which a machine for sealing an inflow and an outflow side of the filter element in a filter housing part includes an annular sealing part. A peripheral seal in the form of an annular collar is provided on a frontal side of the filter element, connected via an axial section of the element casing surface. Part of the collar extends axially over the frontal side of the element, and a frame element is connected with an axial protuberant portion of the collar. As a result, the frame element supports the collar against forces acting radially outwards.

A method to compensate for the magnetic field heterogeneity inside an object of investigation in a MR device obtains an uncorrected magnetic field distribution of the object and executes an MR sequence with a desired k-space coverage by applying RF pulses to generate a transverse magnetization within the object. MR signal data is recorded, magnetic field shimming parameters are dynamically updated and MR signal data are reconstructed to produce images or localized spectroscopic data. Artifacts in a reconstructed image resulting from an uncorrected magnetic field distribution are suppressed by temporally separating MR signals originating from at least two different sub-volumes within a volume of transverse magnetization by generating a nonlinear phase distribution within the object and by dynamically updating shimming parameters to compensate for the field inhomogeneity distributions within the different sub-volumes in the volume of transverse magnetization.

Disclosed is a display device that can both correct unevenness in a linear space and set one unevenness-correction plane outside the linear space, correcting unevenness in ultra-low-brightness regions, thereby effectively correcting unevenness in ultra-low-brightness regions while minimizing increases in power consumption and circuit size. The disclosed display device is provided with: pixels provided with light-emitting elements, which emit light according to levels of current, and pixel circuits that control currents applied to said light-emitting elements in accordance with a video signal; a display unit in which scan lines, which with a prescribed scan period supply the pixels with a selection signal that selects the pixels to be turned on, and data lines, which supply the aforementioned video signal to the pixels, are arranged in a matrix; a first unevenness-correction unit which corrects brightness unevenness in video signals with linear characteristics; and a second unevenness-correction unit which corrects brightness unevenness in video signals with gamma characteristics, in prescribed regions and those below.

A co-axial magnet configuration for the production of a magnetic field and investigational volume which is suitable for measurement of magnetic resonance has at least one superconducting solenoid coil or solenoid coils which are radially nested within each other, wherein the windings of the solenoid coil(s) in a radial region about the axis of the magnetic configuration are disposed between r1 and r2, wherein r1<r2 is characterized in that the windings are surrounded by at least one rotationally symmetric magnet body made from ferromagnetic material which extends over a radial region between r3 and r4 wherein r3<r4 wherein r2<r3<1.3 r2 and r4>1.3 r3, wherein the rotationally symmetric magnet body or bodies are structured, dimensioned and positioned in such a fashion that the magnetic field is homogenized in the investigational volume and the magnetic fringe field outside the magnet configuration is essentially suppressed to permit the production of strong magnetic fields of high homogeneity without requiring notches in the coil configuration.

An actively shielded superconducting magnet configuration (M1; M2; M3; 14) for generating a homogeneous magnetic field B0 in a volume under investigation (4b) has a radially inner superconducting main field coil (1) which is disposed rotationally symmetrically about an axis (z axis) and a coaxial radially outer superconducting shielding coil (2) which is operated in an opposite direction. The magnet configuration consists of the main field coil, the shielding coil and a ferromagnetic field-shaping device (3; 18), wherein the ferromagnetic field-shaping device is disposed radially inside the main field coil. The main field coil consists of an unstructured solenoid coil or of several radially nested unstructured solenoid coils (15, 16) which are operated in the same direction. An extension Labs of the shielding coil in the axial direction is smaller than the extension Lhaupt of the main field coil in the axial direction.ⅆ2ⅆz2⁢BH+A⁡(z)⁢❘z=0⁢≤0applies for the axial magnetic field profile BH+A(z) generated by the main field coil and the shielding coil during operation along the z-axis in the center at z=0 andⅆ2ⅆz2⁢BF⁡(z)⁢❘z=0⁢≥0applies for the axial magnetic field profile BF(z) generated by the ferromagnetic field-shaping device (3; 18) during operation along the z-axis in the center at z=0, wherein the z-axis is oriented in a positive direction of the B0-field. An actively shielded superconducting magnet configuration of considerably simplified structure is thereby provided with a homogeneous and particularly high magnetic field B0 in the volume under investigation.

A pixel circuit is provided, comprising: a driving transistor and a light-emitting element connected in series between a first level terminal and a second level terminal, and a second transistor, a third transistor, a fourth transistor, a first capacitor, and a second capacitor A second capacitor is connected between the control electrode of the driving transistor and the second terminal of the light-emitting element, and the threshold voltage is stored through the first capacitor, thereby realizing threshold voltage compensation for the driving transistor and the light-emitting element, and then compensating for the pixel circuit display unevenness. According to the above pixel circuit, a display device is also provided, wherein both the first control line and the light emission control line are global lines. Also disclosed is a pixel circuit driving method.

For a uniform image quality of digital X-ray records, a solid-state detector is provided. The detector includes light-sensitive pixel elements arranged in an active matrix, and a reset light source arranged behind them in the radiation direction of X-ray radiation, with the reset light source being in the form of an arrangement with light-emitting diodes and with the light-emitting diodes being designed such that can be driven individually and their intensity can be controlled individually. At least one of a failed and malfunctioning light-emitting diode is detectable. The intensities of the serviceable light-emitting diodes are driven and controlled in the event of a failure or a malfunction of at least one light-emitting diode in such a manner that the intensity and / or the homogeneity of the reset light source remains the same.

The invention relates to a filter (1) comprising a plurality of rotating filter discs (3) arranged on a shaft (2) and provided with a porous filter medium. The invention is characterized in that elastomer elements (8, 8') are used as separators and are arranged between each individual filter disc (3) on the shaft (2). The invention also relates to a filter disc (3) for such a filter (1).

An arrangement for radiation of a radio-frequency field into an examination subject has a local coil unit with a housing. An insulating dielectric material is embodied at least at one part of the housing in order to passively compensate an inhomogeneity of the B1 field that occurs in the examination subject. An adjustment arrangement allows for fixed but detachable provision of the insulating dielectric material at the housing part.

A pixel circuit comprises: a driving transistor (T1) and a light emitting element serially-connected between a first power level end (VDD) and a second power level end (VSS), wherein a first gate of the driving transistor (T1) is connected to a first end of the light emitting element, a second transistor (T2) and a storage capacitor (C1) are connected between a control gate of the driving transistor (T1) and a conduction electrode. At an initialization stage, the second transistor (T2) conducts to separately initialize voltage levels of two ends of the storage capacitor (C1) and a voltage level of the control gate of the driving transistor (T1). At a threshold compensation stage, a reference voltage level (V REF) is provided to the control gate of the driving transistor (T1), so as to read a threshold voltage (V TH) of the driving transistor (T1) and store the same in the storage capacitor (C1), thereby compensating for the threshold voltage (V TH) of the driving transistor (T1) and inhomogeneity shown in the pixel circuit.

A lifting device for lifting articles such as pulp units bound together by tying means, the device comprising at least one horizontal beam (1) connected to a crane and having attached thereto a plurality of The hook cranes (3) moving on the beam, when the grabbing members (4) belonging to the cranes are brought close to each other, each hook crane (3) located at the item to be lifted is arranged as a strapping device for grabbing the item, binding The device is thus suspended from the gripping member. The hook crane (3) is provided with a pair or two pairs of grasping members with a fixed distance from each other, and its grasping movement is parallel movement, and each hook crane (3) is suspended at an adjustable distance from each other by the following components: The trough member (2) of the horizontal beam (1), the trough member (2) allows each hook crane (3) to move a predetermined distance respectively in the vertical direction and tilt to a predetermined angle in the trough member; intermediate beams (8) of the beams (1), each intermediate beam (8) attached to be suspended from the horizontal beam (1) by channel members (2), the intermediate beams (8) transverse to the horizontal beams (1) and the channel members (2) Each hook crane (3) or pair of hook cranes is allowed to move a predetermined distance in the vertical direction and tilt to a predetermined angle in the trough member, respectively.