310results about How to "Improve flickering" patented technology

To provide a hold-type display device without a problem of motion blur and a driving method thereof. The length of a period for displaying a blanking image in one frame period is controlled in accordance with a control parameter showing the degree of motion blur, and the level of a signal supplied to a display element is changed in accordance with the length of the period for displaying the blanking image. Accordingly, the hold-type display device without a problem of motion blur and the driving method thereof can be provided.

An alternating current (AC) light emitting device includes an AC light emitting diode (LED) module and a waveform modulation unit. The AC LED module includes at least two sets of micro-diodes. The waveform modulation unit coupled between the AC LED module and an AC voltage source modulates a waveform of the AC voltage source.

This invention generally relates to solid state lighting control, and more particularly to a dimmer interface circuit and a method for reducing ringing on a drive signal to a solid state lighting device. An embodiment is a dimmer interface circuit for controlling brightness of a solid state light emission device, the interface circuit having an input to receive a brightness control voltage from a dimmer circuit and comprising: a voltage converter to provide a converter output voltage and having an inductive component and a charge store, the charge store controllably coupled to receive charge from the inductive component to thereby convert the brightness control voltage to the converter output voltage; and control circuitry comprising: an input to receive a voltage level indication of the brightness control voltage; an input to receive a voltage level indication of the converter output voltage; a comparison circuit to compare a said received brightness control voltage level indication and a said received converter output voltage level indication; and a transition detector to detect a transition of the brightness control voltage, said transition for turning a said solid state light emission device on, wherein the control circuitry is configured to control the voltage converter dependent on a said comparison of said level indications received at a time of a said transition in a first cycle of the brightness control voltage, such that a difference between the brightness control voltage and the converter output voltage at a time of a said transition in a second, later said cycle is closer to a target voltage difference or target voltage difference range than a said difference at the time of the transition in the first cycle.

The invention discloses a pixel circuit, an organic electroluminescence display panel and a display device. By adding a switch module to the pixel circuit, an abnormal driving current outputted by a driving module can be prevented from flowing to a light emitter when a first display frame starts, and a screen flickering problem of a display panel generated during starting the first frame can be ameliorated, as the abnormal driving current of the pixel circuit can be prevented by the switch module from flowing to the light emitter, so high level signals can be prevented from flowing to a low level signal end before low level signals are inputted to the low level signal end of the pixel circuit, the low level signal end of the pixel circuit has no positive potential before the low level signals are received by the low level signal end, and thereby a problem that abnormal display of the display panel caused by a self-protection function of a power source signal chip triggered by positive and negative potential reception pressures at the low level signal end of the pixel circuit can be ameliorated.

The embodiment of the invention discloses an array substrate and a driving method thereof, a display panel and a display device. The array substrate comprises pixel circuits arranged in an array mode,wherein a first initialization module and a second initialization module are connected in series between an initialization signal end and the control end of the driving module; the output end of thesecond initialization module is electrically connected to the control end of the driving module, the output end of the first initialization module and the input end of the second initialization moduleare electrically connected to the first intermediate node, and the first pole of a light emitting module is electrically connected to a reset node; the control end of the first initialization moduleis used for receiving a first additional scanning signal, and the control end of the second initialization module is used for receiving a first scanning signal; and in at least one light-emitting period of a frame duration, the effective level end time of the first additional scanning signal lags behind the effective level end time of the first scanning signal. Therefore, the flicker phenomenon ofthe power-saving mode can be improved, and the image display effect of the display panel and the display device can be improved.

An alternating current (AC) light emitting device includes an AC light emitting diode (LED) module and a waveform modulation unit. The AC LED module includes at least two sets of micro-diodes. The waveform modulation unit coupled between the AC LED module and an AC voltage source modulates a waveform of the AC voltage source.

The invention discloses a pixel drive circuit and a driving method thereof, and an organic light-emitting display panel. The pixel drive circuit comprises a light-emitting device, a pixel compensation circuit connected with the light-emitting device, a signal input module, and a leakage suppression module. A reset signal terminal is connected with a control electrode of an initialized transistor by the signal input module. The signal input module is used for providing a signal of the reset signal terminal for the control electrode of the initialized transistor under control of the reset signal terminal; and the leakage suppression module is used for increasing a voltage difference between the control electrode of the initialized transistor and a second electrode of the initialized transistor under control of a leakage control signal terminal. On the basis of mutual cooperation of the modules, the signal inputted into an initialized signal terminal by the initialized transistor can be controlled; and the initialized transistor enters a cut-off state by increasing the voltage difference between the control electrode and the second electrode of the initialized transistor. Therefore, formation of a leakage current path of the initialized transistor can be avoided; the brightness of the light-emitting device can be improved; and the scintillation phenomenon can be improved.

An organic light emitting display device includes a display panel including and a plurality of pixels, a gate driver configured to a normal gate signal and an alternative gate signal to the pixels, a data driver configured to provide a data signal to the pixels, an emission control driver configured to an emission control signal to the pixels, and a controller configured to control the gate driver, the data driver, and the emission control driver. Each of the pixels is driven by the normal gate signal in a first driving mode and is driven by the alternative gate signal in a second driving mode. A threshold voltage of a first transistor is compensated in the first driving mode and the threshold voltage of the first transistor is not compensated in the second driving mode.

Disclosed are electronic control gears for LED light engines able to improve power factor by way of gearing up or down the LED current and the AC input current in response to and in synchronization with the AC input voltage. Moreover, the disclosed electronic control gears could further reduce flicker phenomenon and total harmonic distortion when used in collocation with disclosed valley fillers, filling the LED current valleys only during the dead time, and in conjunction with disclosed dummy loads, ramping up or down the AC input current only during the dead time.

The invention discloses a light-emitting device and a projection system and stage lighting system thereof. The light-emitting device comprises: an excitation light source which is used to generate exciting light; a wavelength conversion device which comprises a wavelength conversion layer, wherein the wavelength conversion layer converts at least part of the exciting light to an excited light; a light-splitting device which comprises at least two sections, wherein emergent light from the wavelength conversion device at least emerges two colors by the two sections; a first driving device which is used to drive the wavelength conversion device, wherein light spots generated by the exciting light emitting on the wavelength conversion layer act on the light conversion layer along a desired trajectory with the first driving device,; a second driving device which is used to drive the light-splitting device, wherein different sections of the light-splitting device periodically locate on a light path of the emergent light of the wavelength conversion device with the second driving device, and movement velocity of the wavelength conversion device is n times the movement velocity of the light-splitting device, n is bigger than or equals to 1.1 or n equals to 1 divided by m, and is bigger than or equals to (L+1) / 1.1 and is smaller than or equals to L / 0.9, wherein m is bigger than 1, and L is an integer which is bigger than or equals to 1, and is smaller than or equals to 4. The light-emitting device provided in the invention enables brightness change or color change of the emitting light of the light-splitting device not to be perceived by human eyes.

The invention discloses an array substrate and a liquid crystal display and a driving method thereof. Multiple scanning lines, multiple data lines and multiple pixel units in array configuration are arranged on the array substrate, the array substrate is further provided with a first voltage line, a second voltage line, multiple common electrode strips and multiple control switches, each common electrode strip extends in the direction of the scanning lines, the common electrode strips consist of multiple first common electrode strips and multiple second common electrode strips, the multiple first common electrode strips and the multiple second common electrode strips are arranged alternately in the direction of the data lines, the multiple control switches consist of multiple first control switches and multiple second control switches, each first common electrode strip is connected with the first voltage line and the corresponding scanning line through the corresponding first control switch, and each second common electrode strip is connected with the second voltage line and the corresponding scanning line through the corresponding second control switch.

The invention relates to a grid pulse modulation circuit and a shading modulation method thereof. The grid pulse modulation circuit is provided with an output end, a voltage modulation circuit and a comparison control circuit, wherein the voltage modulation circuit is coupled between a grid power supply voltage and a second preset voltage and receives control of a shading control signal so as to shade and make the output end output a voltage signal for shading; the comparison control circuit comprises a comparator and a switch component; and the first input end of the comparator is coupled to a node of the voltage modulation circuit, while the second input end is coupled to a first preset voltage. When the voltage modulation circuit performs shading operation, the relative magnitude relation between the voltage at the node point and the first preset voltage decides the switching on and switching off states of the switch component so as to decide the occasion that the first preset voltage is transmitted to the output end.

The present invention provides a flexible display panel and a flexible display device comprising the same. The flexible display panel comprises: a flexible substrate; a luminescent device layer located at one side of the flexible substrate; an encapsulation layer located at one side, far away from the flexible substrate, of the luminescent device layer; and a conductive bonding layer located at one side, far away from the encapsulation layer, of the flexible substrate, wherein the conductive bonding layer is an adhesive layer with conductivity and is connected with an external potential. The conductive bonding layer can shield the interference of external electromagnetic signals on a circuit in the luminescent device layer while having a dual-face bonding function so as to improve the display frame scintillation phenomenon caused by the external electromagnetic signals, improve the display effect of the flexible display device and reduce the module thickness of the flexible display device.

The invention relates to a liquid crystal displaying device which comprises a liquid crystal displaying panel, a scan driving circuit, a data driving circuit and a delay compensation circuit. The liquid crystal displaying panel comprises a plurality of scanning lines and a plurality of data wires which are insulate and orthogonal with the scanning lines. The delay compensation circuit comprises a plurality of capacitors which are corresponding to the scanning lines. The scan driving circuit is used for providing a plurality of scanning signals for the scanning lines. The data driving circuit is used for providing a gray scale voltage for the data wires when the scanning lines are scanned. When the scanning lines are scanned, the corresponding capacitor discharges and provides a compensation signal to the scanning line, and the corresponding capacitor of the next scanning line is charged while the corresponding capacitor of the previous scanning line is discharged to ground.

The disclosure relates to a pixel circuit and a driving method thereof. The pixel circuit comprises a first transistor and a second transistor whose control terminals receive first scanning signals; athird transistor and a fourth transistor whose control terminals receive second scanning signals; a fifth transistor whose control terminal is electrically connected to a first capacitor; a sixth transistor, a seventh transistor, and an eighth transistor whose control terminals receive control signals; and a light emitting diode. According to the pixel circuit and the driving method thereof, an electric leakage current can be reduced or reversely supplemented, the capacitance maintenance capability of the capacitor is improved, the flickering degree of images can be improved, and the stability of the displayed images is improved.

The invention discloses an array substrate and a display device. The array substrate comprises a public electrode wire and a plurality of pixel units distributed in an array manner, wherein each pixel unit comprises a first public electrode, a pixel electrode and a second public electrode which are located on a substrate and arranged sequentially, wherein the pixel electrode adopts a plate electrode, and the second public electrode adopts a slit electrode; an insulation protective layer is arranged between the pixel electrode and the second public electrode, and between the pixel electrode and the first public electrode respectively, and projections of the pixel electrode, the first public electrode and the second public electrode on the substrate are overlapped; and the first public electrode and the second public electrode are electrically connected with the public electrode wire. The array substrate effectively solves the problem of a blinking phenomenon of the display device during use and reduces delay during the transmission process of a public voltage signal simultaneously, so that harmful crosstalk is prevented, and the display effect of the display device is improved.

The invention discloses an organic electroluminescence display panel and a display device. The threshold voltage of the driving transistor drifts due to reasons such as process, device aging and the like, and the compensation transistor is arranged to compensate the threshold voltage before the pixel driving circuit controls the OLED to display, so that the saturation current of the driving transistor is irrelevant to the threshold voltage of the driving transistor. The orthographic projection of the third metal layer on the substrate covers the orthographic projection of the compensation transistor on the substrate; in this way, electric leakage of the compensation transistor due to illumination can be prevented, so that potential rise of the grid electrode of the driving transistor of the pixel driving circuit due to electric leakage of the compensation transistor in the light-emitting stage can be avoided, and the grid-source voltage of the driving transistor can be prevented from becoming small. Furthermore, attenuation of OLED brightness can be reduced, and the problem of image flickering of the display panel is effectively solved.

The light-emitting module according to one embodiment comprises first to Nth light-emitting element packages (wherein N is a positive integer greater than or equal to 1), which are connected in series to one another, and a current level regulator for regulating the level of current flowing through the Nth light-emitting element package. Each of the first to Nth light-emitting element packages comprises a light-emitting cell comprising a plurality of sub-cells, which comprise at least one light-emitting element and are connected in series or parallel to one another, and a flicker control unit, which is connected between the plurality of sub-cells and selectively forms the path or current flowing through the light-emitting cell according to the level of an external driving voltage. At least one of the first to Nth light-emitting element packages further comprises a first current control resistor connected to the output of the light-emitting cell.

A display device includes a scene conversion detecting module to detect whether a scene is converted in an input image, and a brightness compensating module to determine an image category of the input image when a scene conversion is generated in the input image, and compensating for the brightness of the input image by calculating a weighted mean value of a tone increase value corresponding to the determined image category and a tone increase value corresponding to an image category of a previous image.

A driving method of grid on liquid crystal display includes generating signal for driving grid, superimposing revision signal in opposite polarity to driving signal of grid on grid driving signal for generating revised driving signal of grid in order to lower high potential level of grid driving signal and output the revised signal, utilizing this revised grid driving signal to drive corresponding scanning line.

The invention discloses a liquid crystal display which comprises a liquid crystal panel, a display control circuit and a data driven circuit, wherein the display control circuit is used for receiving an image signal and generating a time sequence signal and a data signal according to the image signal; the data driven circuit is used for receiving the time sequence signal and the data signal so asto form a plurality of data voltages; and before the data voltage for driving a non-polar inversed pixel is pre-output, the data driven circuit is used for adjusting the voltages of a plurality of data wires to be preset voltage, so that the electric charge quantity stored by a polar inversed pixel is the same as that stored by the non-polar inversed pixel for the same-gram scale frame. The liquid crystal display can be used for improving the phenomenon that the frame flashes when the image of the liquid crystal display is displayed and has a better display effect.

Disclosed herein are a driving circuit and a lighting apparatus for a light emitting diode capable of improving a flicker, light efficiency, and electrical characteristics. The disclosed driving circuit for a light emitting diode includes: a dimmer modulating an AC voltage input depending on a selected dimming level; a rectifier full-wave rectifying the modulated AC voltage output from the dimmer to generate and output a driving voltage; and a driving module receiving the driving voltage of the rectifier to detect the selected dimming level and controlling a driving mode of a plurality of light emitting diode groups depending on the detected dimming level, in which the driving module selects one of a resistance driving mode driving all the plurality of light emitting diode groups and a sequential driving mode sequentially driving the plurality of light emitting diode groups to improve light efficiency and electrical characteristics.

The invention discloses a liquid crystal displayer displaying two-dimensional videos and three-dimensional videos in a switchover mode. According to the liquid crystal displayer, scanning lines in each row are additionally provided with a plurality of switch units without additionally arranging a grid driver. The switch units are used for controlling charging of pixel units and electric charge sharing respectively, and therefore the purpose of independently controlling the pixel charging and electric charge sharing is achieved. The problem that flicker happens when the three-dimensional videos are displayed in the prior art can be solved under the situation that the extra grid driver is not arranged.

The present invention relates to a dynamic contrast ratio processing method and apparatus of a liquid crystal displaying apparatus. The method includes: performing a histogram statistics processing on input data of the present frame, dividing a statistics processing result into N gray groups, and calculating the a data amount corresponding to each gray group; setting gray groups whose corresponding data amounts are larger than or equal to a first threshold as gray groups with priority, and setting a gray group having the highest luminance in gray groups with priority as a main priority gray group; determining whether the luminance of the main priority gray group of the present frame is the same as that of the main priority gray group of a previous frame; if it is, comparing data amounts with corresponding tolerance values to determine whether it is necessary to change the luminance control parameter, otherwise, obtaining the luminance control parameter of the present frame according to the main priority gray group of the present frame; outputting the luminance control parameter of the present frame at last. The present invention improves flickering phenomenon effectively and enhances picture quality.