437 results about "Anode voltage" patented technology

In a display device, the anode voltage of an organic light emitting element is periodically reset. The control terminal of a driving transistor is periodically reset, and an input data voltage is connected to the control terminal through an input terminal and an output terminal of the driving transistor. As a result, good control over the displayed luminance is achieved. Other features are also provided.

A display device includes an organic EL element and a capacitor. A driving transistor is connected to an anode of the organic EL element and passes a current to the organic EL element. The current corresponds to a voltage held in the capacitor. A first switch is between the capacitor and a data line, and the data line supplies the voltage to the capacitor. A voltage detector is connected to the data line for detecting an anode voltage applied to the organic EL element. A second switch is between the anode and the data line. A controller turns on the first switch, causes the organic EL element to emit light, and causes the voltage detector to detect the anode voltage by turning off the first switch and turning on the second switch while the organic EL element is emitting light.

The invention provides an aging compensation system and method for an OLED component. The aging compensation system for the OLED component comprises a pixel circuit, a first power source, a second power source, an aging detection circuit and a driving chip. The pixel circuit comprises the OLED component connected between the first power source and the second power source, the driving chip is connected with the pixel circuit through a data line and used for driving the OLED component to emit light, and the aging detection circuit is connected between the anode of the OLED component and the driving chip which measures the anode voltage of the OLED component through the aging detection circuit. According to the aging compensation system and method for the OLED component, the aging detection circuit is additionally arranged on a traditional pixel circuit so that the driving chip can monitor the aging conditions of the OLED component in real time through aging testing points, and segmented compensation can be performed according to difference of the aging conditions.

In some variations, an apparatus provides real-time monitoring of voltage and differential voltage of both anode and cathode in a battery configured with at least one reference electrode. Voltage monitors are connected to a computer programmed for receiving anode voltage signals; receiving cathode voltage signals; calculating the derivative of the anode voltage with respect to time or with respect to capacity; and calculating the derivative of the cathode voltage with respect to time or with respect to capacity. Other variations provide an apparatus for real-time assessment of capacities of both anode and cathode in a battery, comprising a computer programmed for receiving electrode voltage signals; estimating first and second electrode open-circuit voltages at two different times, and correlating the first and second electrode open-circuit voltages to first and second electrode states of charge, respectively, for each of anode and cathode. The anode and cathode capacities may then be estimated independently.

A pixel, a display device including the same, and a driving method thereof. After the anode voltage of an organic light emitting diode (OLED) is discharged and reset, a first voltage corresponding to a data voltage applied to a storage capacitor is transmitted to a compensation capacitor. A voltage corresponding to the threshold voltage of the driving transistor is transmitted to the compensation capacitor. The data voltage is stored according to a data signal corresponding to the storage capacitor. The organic light emitting diode (OLED) emits light according to a driving current flowing to the driving transistor by the voltage stored to the compensation capacitor. Here, the light emitting steps of a plurality of pixels are concurrently generated, and a scan step and the light emitting step are temporally overlapped.

An organic light emitting diode display and a method for sensing driving characteristics thereof are discussed. The organic light emitting diode display supplies a data voltage of an input image to pixels each including an organic light emitting diode in a driving mode and senses changes in driving characteristics of the pixels in a sensing mode. The organic light emitting diode display in one example includes a low potential power voltage adjustment unit configured to reduce a low potential power voltage of the pixels to a negative voltage in the sensing mode and adjust the low potential power voltage to a ground level voltage in the driving mode, and a sensing unit configured to sense an anode voltage of the organic light emitting diode using an analog-to-digital converter in the sensing mode.

The application discloses an organic light-emitting display panel, an organic light-emitting display device and a pixel compensation method; according to a specific embodiment, the organic light-emitting display panel comprises a plurality of data wire sets; a pixel array; a plurality of pixel drive circuits; a pixel compensation circuit for providing bias current, collecting anode voltage of organic light-emitting diodes and generating compensated data voltage based on the bias current and the anode voltage; a power module for providing bias current to the data wire set and transmitting the bias current to the organic light-emitting diodes through the data wire set; a sampling module for collecting anode voltage of the organic light-emitting diodes through the data wire set; a data voltage generating module for transmitting the compensated data voltage to the pixel drive circuit through the data wire set based on the anode voltage and bias current. The embodiment ensures that the brightness of organic light-emitting diodes is unchanged while compensating the organic light-emitting diodes, so that the organic light-emitting diodes can be compensated more precisely.

A field emission device including a cathode having an electric field emitter for emitting electrons, a field emission inducing gate for inducing electron emission, and an anode for receiving the emitted electrons. A field emission suppressing gate is interposed between the cathode and the field emission inducing gate for suppressing electron emission, so that problems such as gate leakage current, electron emission due to anode voltage, and electron beam spreading of the conventional field emission device are significantly overcome.

A failure detection device detects the voltage across the main electrodes of an IGBT via a diode. The failure detection device determines occurrence of short-circuit failure in the IGBT when the anode voltage of the diode is lower than a first predetermined reference voltage. Determination can be made, excluding the case of a proper operation corresponding to a flywheel diode in an ON state, preferably together with the condition that the anode voltage of the diode is higher than a second predetermined reference voltage.

In aspects of the invention, a flyback converter configuration LED drive circuit, by adopting a configuration such that anode voltages of LEDs smoothed by a smoothing capacitor on the secondary side of a transformer and a terminal of a drive IC circuit are used as a node common. Current can be supplied to the primary side of the smoothing capacitor by a start-up circuit when starting, the need for an auxiliary winding, smoothing capacitor, and rectifier diode which have heretofore been necessary to supply a power source to the drive IC circuit is eliminated. Consequently, the number of parts can be reduced, meaning that the configuration of the LED drive circuit becomes simple, thus enabling a reduction in size and cost of the LED drive circuit.

The invention is concerned with the X-ray tube electron source (cathode) structural design of the field emission cathode X-ray tube, which is the type of source with no heating request. It includes: the field emission cathode sheet (-), the modulation grid sheet (-), the highlights electrode films (-), the extremely high-voltage anode target sheet (-), the electrodes connect each sheets, and the carbon Nano-tube electrode emission layer (-) attaches with the field emission cathode sheet; the modulated voltage of the grid controls the on/off of the X-ray line source, and anode to cathode voltage and the grid voltage controls its strength, highlights voltage controls the emission of the electron beam. The invention is with the miniaturization design, smaller X-ray tube with high resolution.

The invention discloses an organic light-emitting display panel and a pixel compensation method. The organic light-emitting display panel comprises a pixel array comprising M rows and N columns of pixel areas; multiple pixel driving circuits which each comprise a light-emitting diode and a driving transistor used for driving the light-emitting diode, wherein each light-emitting diode is disposed in each pixel area; and multiple pixel compensation circuits which are used for acquiring anode voltages of the light-emitting diode in at least one pixel driving circuit and light-emitting currents flowing through the light-emitting diode and generating compensation signals based on the anode voltages and the light-emitting currents. According to the scheme, threshold voltages of the driving transistors, carrier mobility and decline of the light-emitting diodes can be compensated, and uniformity of display brightness of the organic light-emitting display panel in a time dimension and a space dimension is guaranteed accordingly.

The invention discloses an LED backlight drive circuit, a backlight module and a liquid crystal display device. The LED backlight drive circuit comprises a power source and a first comparator, an output capacitor is parallelly connected and an LED lamp bar of a first controllable switch is serially connected between an output end and a grounding end of the power source, a cathode of the first comparator is connected with first reference voltage, an anode of the first comparator is coupled with the output end of the power source, and an output end of the first comparator is coupled with a control end of the first controllable switch. When anode voltage of the first comparator exceeds cathode voltage of the same, the output end of the first comparator drives the first controllable switch to be switched on. The LED lamp bar is controlled to be connected at the predetermined voltage, and accordingly, even if the output capacitor stores electric quantity, an LED cannot be driven to be turned on, and the first controllable switch can be switched on only on the condition that complete start-up is achieved and output voltage reaches a preset voltage value, and further the problem of flickering in start-up is solved.

Provided is an organic light emitting display device. The organic light emitting display device includes: a plurality of sub-pixels including an anode and a cathode; an anode line configured to supply an anode voltage to the anode; and a cathode line configured to supply a cathode voltage to the cathode, and in each of the plurality of sub-pixels, a direction of an anode voltage input of the anode line and a direction of a cathode voltage input of the cathode line are different from each other and face each other in order to reduce a deviation in a potential difference between the anode and the cathode. Thus, it is possible to improve uniformity in the potential difference between the anode and the cathode caused by a line resistance.

The invention discloses a thyristor rectifier bridge parallel operation full digital current homogenizing control device, which comprises a regulator, a rectifier cabinet controller, thyristor rectifier bridges and a detection component. The regulator is a master controller; the rectifier cabinet controller is a slave controller; a terminal signal processing module regulates terminal voltage and current signals of a generator, so that the terminal voltage and current signals are suitable to be output to an analog-to-digital conversion module of a regulator controller; and a synchronization signal processing module regulates the anode voltage of the rectifier cabinet thyristor rectifier bridges, so the anode voltage is suitable to be output to a pulse formation module of the regulator controller to serve as a synchronization signal of the anode voltage of the thyristor rectifier bridges. Due to the adoption of digital closed loop control, full digital intelligent current homogenization for a plurality of parallel operation thyristor rectifier bridges under full-motion environment is realized by real-time sampling and control.

A light emission driving device includes an output voltage supply unit arranged to generate an output voltage from an input voltage so as to supply the output voltage to a load, a determination unit arranged to determine whether or not a ground fault due to abnormality may have occurred on the basis of an anode voltage of the load, and a signal output unit arranged to externally output a signal indicating that a ground fault due to abnormality may have occurred when the determination unit determines that a ground fault due to abnormality may have occurred. The output voltage supply unit does not perform generation stop of the output voltage by a trigger of determination by the determination unit that a ground fault due to abnormality may have occurred.

An electron-emitting cathode consists of an electrically conducting emitter layer attached to a side wall which consists of stainless steel and a gate which is fixed at a mall distance inside a concave emitter surface of the emitter layer. The cathode surrounds a reaction area containing a cylindrical grid-like anode and a central ion collector which consists of a straight axial filament. An ion collector current reflecting the density of the gas in the reaction region is measured by a current meter while a gate voltage is kept between the ground voltage of the emitter layer and a higher anode voltage and is regulated in such a way that an anode current is kept constant. The emitter layer may consists of carbon nanotubes, diamond-like carbon, a metal or a mixture of metals or a semiconductor material, e.g., silicon which may be coated, e.g., with carbide or molybdenum. The emitter surface can, however, also be a portion of the inside surface of the side wall roughened by, e.g., chemical etching. The gate may be a grid or it may be made up of patches of metal film covering spacers distributed over the emitter area or a metal film covering an electron permeable layer placed on the emitter surface.

The embodiment of the invention provides a pixel driving circuit and a display device. The pixel driving circuit and the display device solve the technical problem that in the prior art, the contrastratio of a high-resolution and large-screen display screen is low. The embodiment of the invention provides a pixel driving circuit including a voltage storage module, a light emitting device and a light emitting driving module, and driving the light-emitting module to drive the light-emitting device to emit light, the voltage storage module shunts the driving current generated by driving the light-emitting module, that is, the driving current charges the voltage storage module, when the charging is started, the anode voltage of the light-emitting device does not reach the starting voltage ofthe light-emitting device, the light-emitting device does not emit light, and when the voltage storage module is charged with a certain electric quantity, the light-emitting device emits light; The driving circuit provided by the embodiment of the invention actually prolongs the non-light-emitting time of the light-emitting device, and further reduces the average current of zero gray scale, so that the brightness of the display screen in a black picture is reduced, and the contrast ratio of the display screen is increased.

A display device includes a plurality of pixels, each pixel including an organic light emitting diode (OLED) and a driving transistor, a sustain power supply unit applying a first sustain voltage to a plurality of data lines connected to the plurality of pixels, and a data driver applying one of a data signal and a second sustain voltage to the plurality of data lines. For each pixel, the sustain power supply unit applies the first sustain voltage as a first level voltage to reset a gate voltage of the driving transistor and applies the first sustain voltage as a second level voltage to increase the gate voltage of the driving transistor. When an anode voltage of the OLED in each pixel is discharged to be reset, the anode voltage of the OLED is controlled according to a voltage difference between the first level voltage and the second level voltage.

An electron gun assembly of a cathode ray tube has a main electron lens section comprising at least four electrodes, provided in a sequence of first, second, third and fourth grids, a middle first voltage is applied to the first grid, and an anode voltage is applied to the fourth grid. The adjacent second grid and third grid are connected by a resistor, and second and third voltages of substantially the same potential, corresponding to voltages higher than the middle first voltage and lower than the anode voltage, are applied thereto. An asymmetrical lens is provided between the adjacent second grid and the third grid second lens region, and a voltage which changes in synchronism with the deflecting magnetic field is applied to the first grid. Therefore, it is possible to provide a cathode ray tube wherein a phenomenon of sideways deviation of an electron beam at the peripheral region of a screen caused by lens magnification difference in the horizontal and vertical directions is reduced, and which has good image characteristics in all regions of the screen.

The embodiment of the invention discloses a power supply charging circuit and method, a power supply and terminal equipment. The power supply charging method comprises the following steps: when the power supply is under the charging state, a power supply management chip detects the anode voltage of a cell in the power supply; and when the anode voltage of the cell is detected to be not lower than a preset voltage, the power supply is controlled to be converted into a constant-voltage charging mode from a constant-current charging mode. Compared with the anode voltage charging mode of a detection power supply, the power supply charging method provided by the invention has the characteristics that the power supply charging mode is switched when the cell voltage is detected to achieve the preset voltage by the power supply management chip, so that the charging time of a constant-current charging mode can be prolonged to the maximum degree, the charging time of the constant-voltage charging mode is correspondingly shortened, the shortened constant-voltage charging mode time is more than the prolonged constant-current charging mode time, the integral charging time of the power supply is shortened, and the charging speed is improved.

A power control system for a satellite receiving radio-frequency signals includes a digital processor and a traveling wave tube amplifier system and corresponding traveling wave tube. An anode voltage of the traveling wave tube amplifier system is used to modulate or saturate the current of the electron beam of the traveling wave tube so that the output power of the traveling wave tube amplifier system, from the saturated electron beam, is proportional to a waveform envelope of the radio-frequency signals. The digital processor controls anode and RF input signal amplitudes to the traveling wave tube and predicts necessary corrections.

The present disclosure provides devices, circuits, and methods for driving an LED display panel, so as to ensure the delivery of equal global charge at minimum gray scale. In one example, the circuit of the present disclosure includes a current source, a detection module, and a measurement module. The current source is configured to generate a current signal for the LEDs. The detection module is configured to detect a forward voltage of the LEDs in response to a low current applied to the LEDs. The detection module is further configured to hold the detected forward voltage. The measurement module is configured to measure a time period for an anode voltage of the LEDs to rise to the detected forward voltage in response to a display current applied to the LEDs.

Stacked SCR's are disclosed with a resistor connecting an internal portion of the upper SCR to an internal portion of the lower SCR. The anode of the protective circuit is connected to a contact on a target circuit to be protected and the cathode of the protective circuit is connected to ground or a reference voltage on the target circuit. The anode voltage is directed to the lower SCR via the resistor such that when the voltage on the anode reaches the triggering voltage of the lower SCR, that SCR triggers and that triggering triggers the upper SCR, such that the stacked SCR's both trigger and thereby limit the voltage between the anode and the cathode and thereby protecting the target circuit.

An embodiment of the invention discloses a pixel driving circuit, a pixel driving method and a display device. The pixel driving circuit comprises a presetting unit, a first energy storage unit, a second energy storage unit, a compensation unit and a driving unit, wherein the pre-setting unit is used for providing a signal of a data signal end to a first node under the control of a scanning signal end, and is used for providing a signal of an input signal end to a second node under the control of a resetting signal end; the first energy storage unit is used for storing a voltage value between the first node and the second node; the second energy storage unit is used for storing a voltage value between the second node and a second power source end; the compensation unit is used for compensating for a voltage value of the second node under the control of a light-emitting control end; and the driving unit is used for delivering a driving current used for driving a light-emitting element to a third node under the control of the first node. According to the pixel driving circuit, the pixel driving method and the display device, the driving current obtained by means of the pixel driving circuit is irrelevant to a threshold voltage of a driving transistor and an anode voltage of the light-emitting element, the uniform display brightness of the display is achieved, and the display effect of the whole display is improved.