154results about How to "Avoid flickering" patented technology

A liquid crystal display device includes a liquid crystal display panel including a plurality of data lines to which a data voltage is supplied, a plurality of gate lines to which a gate pulse is supplied, and a plurality of liquid crystal cells, a data drive circuit to invert a polarity of the data voltage in response to a polarity control signal and to output the data voltage to the data lines in response to a source output enable signal, a gate drive circuit to supply the gate pulse to the gate lines, and a POL/SOE logic circuit to invert the polarity control signal for every frame period except at Nth-multiple frame period (where N is a positive integer), wherein the POL/SOE logic circuit controls the polarity control signal at every Nth-multiple frame period such that the polarity of the data voltage is the same as the previous frame period and controls a pulse width of the source output enable signal at every Nth-multiple frame period to be longer than for the other frame periods.

An illumination device comprising a plurality of light emitting diodes (LEDs) and a method for controlling the illumination device while avoiding flicker in the LED output is provided herein. According to one embodiment, the method may include driving the plurality of LEDs substantially continuously with drive currents configured to produce illumination, periodically turning the plurality of LEDs off for short durations of time during a first period to take measurements or communicate optical data, and increasing the drive currents supplied to the plurality of LEDs by a small amount when the LEDs are on during the first period to compensate for lack of illumination when the LEDs are periodically turned off during the first period.

The invention discloses a control method and device of a light ring. According to change of shutter time and change of a gain value, the light ring of an adjustment lens is controlled so as to be adaptive to versatile demands of an application scene. The control method of the light ring comprises the following steps of acquiring current environment brightness, the shutter time of the lens and the gain value during exposure; adjusting the shutter time and the gain value in an automatic exposure mode when the difference between the current environment brightness and the preset target brightness is determined to exceed a preset threshold interval; and controlling the light ring of the adjustment lens according to the change of the shutter time and the change of the gain value.

The invention relates to a liquid crystal panel and a display device containing the same, wherein, the liquid crystal panel comprises a plurality of pixel units; each pixel unit comprises a gating line, a data line, a pixel electrode and a first switch element; the common electrode of a first pixel unit and a second pixel unit is connected to a first common line and a second common line respectively by a second switch element in the pixel units at the same line of the liquid crystal panel, wherein, the first common line is connected to a first common voltage, the second common line is connected to a second common voltage, the first common voltage and the second common voltage are AC voltage, and the voltage levels in the same frame are opposite; meanwhile, the first switch element and the second switch element are equivalently designed thin-film transistors. The liquid crystal panel of the invention can reduce the power consumption of a source driver and improve the quality of images.

An apparatus for controlling generation of power to be generated by a generator driven by an engine mounted on a vehicle equipped with an electrical load operative on the power from the generator, the generator including a field winding to which current is supplied on the power, and a duty cycle of the current being increased to maintain the power of the generator, the apparatus comprising duty cycle limit means for limiting an increasing rate of the duty cycle in response to an increase in an amount of the load when the engine is in an idle state; rotation frequency detecting means for detecting the rotation frequency of the engine; and limit value deciding means for deciding a limit value for the increasing rate of the duty cycle to a greater value than a limit value corresponding to the idle state, when the rotation frequency detecting means detects a decrease in the rotation frequency.

The invention provides an adaptive screen brightness adjusting method and a system. The method comprises steps that screen brightness values are respectively customized by a user under different luminous intensities, and different luminous intensity values and the different customized screen brightness values are stored correspondingly; common luminous intensity standard definition values are divided into multiple intervals; a standard definition luminous intensity interval value of the luminous intensity of the present environment is determined; a brightness value of a present screen is calculated according to the interval value of the luminous intensity value of the present environment and the stored screen brightness values; the screen brightness is adjusted according to the brightness value of the present screen. According to the method, customized setting demands of users can be satisfied, change of the surrounding environment luminous intensity is made to satisfy a certain scope through setting sensitive intervals, adaptive brightness adjustment on the display screen is realized, and screen splash is avoided.

A gate driver circuit, a display panel, and a display device. A number of emission start signals, with at least one a delay time, a pulse width, or a combination thereof, are supplied in a frame period in which display driving is performed at a low driving frequency. This decreases a degree by which luminance appearing in the frame period is reduced, or changes characteristics of frequency components of luminance, thereby preventing flicker from being observed. The display driving is performed at the low driving frequency reduces power consumption, and is performed at a lower driving frequency to improve the efficiency of the display device.

A light source device includes lamp-type light sources which respectively illuminate display areas obtained by dividing a screen of a display panel, and a backlight drive circuit which drives the lamp-type light sources. Particularly, the backlight drive circuit includes a dimmer control circuit which generates dimmer control signals having a common duty ratio which is changed to define ON time for each preset period of time and being set to different phases, and driving units which respectively drive the lamp-type light sources according to the dimmer control signals generated from the dimmer control circuit.

The present invention provides a pixel driving circuit, a driving method thereof, and a display device. The pixel driving circuit of the present invention comprises a data writing unit, a threshold compensation unit, a driving unit, a light-emitting unit, and a voltage stabilizing unit; the data writing unit is connected with a first node, a scan signal line and a data signal line; the first node is a connection node between the data writing unit and the driving unit; the threshold compensation unit is connected with the first node, a first control signal line, a first voltage terminal and the driving unit; the driving unit is connected with the light-emitting unit; and the voltage stabilizing unit is connected with the data writing unit, a second control signal line and the first voltage terminal.

An imaging apparatus is provided in which a flicker is prevented. The imaging apparatus includes an imaging part that includes an optical system to form an image of a subject and an imaging element to generate an image signal by photoelectrically converting an optical image of the subject formed by the optical system, an image processing part to perform an image processing on the image signal, a display part/operation part having at least display and setting functions, a luminance change detection part to detect change of luminance of the subject, a signal processing part to calculate flicker amounts at respective frequencies based on signal intensities with respect to luminance change information acquired by the luminance change detection part, and a control unit to cause the display part/operation part to display the flicker amounts at the respective frequencies calculated by the signal processing part.

The invention provides a non-isolated LED constant-current driver circuit employing a BUCK framework. The non-isolated LED constant-current driver circuit comprises a high-voltage power supply module for generating DC voltage, a floating current sampling module for sampling current flowing through a power switch tube, and a constant-current driver module for controlling the power switch tube according to the current flowing through the power switch tube to achieve constant-current control on an LED lamp string. By a high-voltage power supply technology, a constant DC power supply is directly generated from a drain end of the power switch tube to provide a chip with electricity, a resisting resistor is omitted, meanwhile, a VCC capacitor can be changed into a low-voltage capacitor with lower cost, the cost of a system is reduced and the complexity of the system is reduced. By a floating sampling technology, a special current sampling pin CS is removed, the driver chip only comprises three pins and cheap encapsulation can be adopted, so that the cost of the chip is greatly reduced. Open circuit protection setting is integrated into the chip, so that the problem of LED twinkling due to the fact that a high-resistance pin ROVP is easily disturbed is solved and the performance is effectively improved.

The invention provides a display device, a refreshing method and a refreshing device of a display interface. The refreshing method of the display interface comprises the following steps of: acquiring a control, changing relative to the current display interface, of a next display interface; acquiring pixel data of a display region corresponding to the changed control; and refreshing the display interface based on the pixel data and coordinate data of the display region corresponding to the changed control. In the display device, the refreshing method and the refreshing device of the display interface, the display region corresponding to the changed control is locally refreshed; and the screen flash phenomenon of the display device caused by overall (full screen) refreshing in the prior art is avoided.

The invention discloses a state monitoring method and device for terminal equipment and the terminal equipment. The method comprises the following steps: during pre-sampling, switching off a transmitting end in a proximity transducer, and reading a first infrared intensity value through a receiving end in the proximity transducer; during formal sampling, starting the transmitting end, and reading a second infrared intensity value from the receiving end; calculating a difference value between the second infrared intensity value and the first infrared intensity value; repeatedly sampling to obtain n difference values, and acquiring a total difference value between the second infrared intensity value and the first infrared intensity value; determining whether the terminal equipment is in a proximity state or not according to the total difference value and a preset difference value. Through the method, internal infrared rays and external interference infrared rays can be identified intelligently, and the phenomenon of splash screen caused by continuous change of the illumination intensity of the mobile terminal by a user in a strong light environment is avoided.

A human-computer interaction method based on neural signals relative to the visual movement relates to the technical filed of the human-computer interaction, and is characterized in that the method comprises the following steps: connecting a human-computer interaction unit waiting to be chosen with motional elements started at different times; arranging an EEG electrode in visual movement area of the user head for recording EEG signals; separately extracting brain waveforms corresponding to each motional element in a sequence according to the difference of the time starting; detecting whether an N2 electric potential corresponding with the visual movement; detecting that a human-computer interaction unit corresponding with the simulation of the N2 electric potential is considered as a target for a tested person; finishing the corresponding functional module by a computer, so as to realize the human-computer interaction. The testing results by the system shows that the choosing of a target averagely costs 6 seconds, and both the detection rate and the false reject rate meet the requirement of the regular human-computer interaction. The method has the advantages of having no scintillations, hardly causing the visual fatigue, and being suitable for low contrast and low illumination condition, and different human-computer sites.

The invention discloses a fill light lamp automatic control method based on video analysis. The fill light lamp automatic control method based on the video analysis achieves the automatic control over a fill light lamp according to the changing of brightness values in a monitoring area. The fill light lamp automatic control method based on the video analysis achieves the self-adaptive control over the fill light lamp according to the changing of ambient brightness, avoids electric energy waste and light pollution to the environment by the fill light lamp, avoids the phenomena that the definition of monitoring video images declines due to insufficient light and the fill light lamp may flicker, saves equipment investment, shortens mounting construction cycles, and improves the reliability of system working.

The invention discloses a shift register unit, a driving method, a gate driving circuit and a display device, and belongs to the field of display technology. The shift register unit comprises a control module, an output module and an angle cutting module; the control module is separately connected with an input signal end, a reset signal end, a control signal end, a first clock signal end, a pull-up node and an output end, and is used for controlling the potentials of the pull-up node and the output end; the output module is separately connected with a second clock signal end, the pull-up node and the output end, and is used for outputting a second clock signal from the second clock signal end to the output end; the angle cutting module is separately connected with the output end and a third clock signal end, and is used for outputting a third clock signal to the output end, in order to pull down the potential of signals output by the output end of the shift register unit at the second output phase, so as to retard the amplitude of gate voltage changes and avoid the phenomena of flicker, ghosts and the like appearing on pictures. The invention is used for displaying images.

The invention provides a method for driving an LCD panel based on a 2n primary color sub-pixel structure and a driving IC of the LCD panel. A sub-pixel array of the LCD panel is an M*N array, and the LCD panel is based on the 2n primary color sub-pixel structure. According to the method, the driving IC of the LCD panel based on a 3 primary color sub-pixel structure is adopted, in the row direction, multiple lines of sub-pixels are divided into multiple units, signal source channels, corresponding to the line number of the sub-pixels in each unit, of the driving IC are connected to each line of sub-pixels in the corresponding unit in sequence, and a connection line of a next signal source channel is emptied so that the polarities of the sub-pixels of the same color in each line can be complementary with one another.

The invention discloses a drive and control circuit and a display device of a display panel. The drive and control circuit of the display panel comprises a shutdown sensing module, a switch module and a neutralization electric discharge module, wherein the shutdown sensing module senses shutdown status and controls switching status of the switch module, the switch module controls work status of the neutralization electric discharge module, and the neutralization electric discharge module is used to release shutdown residual charges of the display panel. The drive and control circuit of the display panel is simple in structure and convenient to manufacture, can rapidly release the shutdown residual charges of the display panel, and then restrains a flare phenomenon, and furthermore improves display effects.

A driving circuit of a liquid crystal display device capable of processing interlace type video signals, includes a data driver inverting a polarity of a pixel data at least every two-field period, converting the pixel data every field period according to a variable gamma voltage, and supplying the inverted pixel data to a liquid crystal display panel, a value of the gamma voltage changing every field period.

The embodiment of the invention discloses a brightness compensation method and device and a brightness compensation system, and the method comprises the steps: obtaining the brightness of a display panel at different refresh frequencies when the display panel displays a test image; obtaining a brightness compensation parameter corresponding to each refresh frequency according to the brightness ofthe display panel under each refresh frequency; when the display panel displays an actual picture, determining a refresh frequency of the actual picture; obtaining a brightness compensation parametercorresponding to the refresh frequency of the actual picture; and compensating for the current brightness of the display panel according to the brightness compensation parameter. According to the brightness compensation method and device and the brightness compensation system, the brightness difference can be effectively improved, and flickering of a picture is avoided.

An electro-optical device includes a plurality of pixels, a plurality of write scan lines including a predetermined number of the plurality of pixels as a unit, and a drive device driving the plurality of write scan lines non-sequentially and adjusting a light-emission period of the plurality of pixels in accordance with a luminance ratio of an image.

The polarity inversion cycle of a voltage applied to a liquid crystal layer is set to at least 2-frame cycle, or more preferably to as long as about 10 sec. Accordingly, a flicker that could not have been prevented at a polarity inversion cycle of about one frame can be prevented, and a longer inversion cycle can reduce power consumption. A material low in ion reactivity and small in residual polarization is used as a liquid crystal material or an orientation film material, thereby preventing the occurrence of a residual DC component in a liquid crystal layer and the deterioration of display quality despite a longer polarity inversion cycle. In the case of an LCD provided with a minimal transmittance with respect to an applied voltage, black can be accurately displayed by, for example, regulating a common electrode potential so that an applied voltage at which the transmittance of a liquid crystal shows a minimum value during an anodic application period is equal to that during a cathodic application period.

The invention provides a synchronous tunnel video display system, which comprises a power supply module, a master server, a human-computer interaction module, a plurality of display modules, a plurality of synchronization modules and a communication module, wherein the master server is used for producing a play image; the plurality of display modules are arranged in a plurality of train running tunnels, and are used for displaying video image information; the plurality of synchronization modules are used for ensuring the synchronization of a train running state and information displayed by the display modules; the communication module transmits data produced by the master server to the display modules; the synchronization module further comprises a plurality of speed testers and a synchronization signal processor; the speed testers are arranged between two metro stations, and are uniformly distributed in the tunnels between the two stations of a train, and when detecting the passage of the train, transmit the information to the synchronization signal processor respectively; the synchronization signal processor performs calculation to obtain a synchronization control signal, transmits the synchronization control signal to the display modules; and the display modules display the video image information according to the instruction of the synchronization control signal. The synchronous tunnel video display system has the advantages of synchronous display capability and high definition.

The invention provides a driving method for a liquid crystal display device and includes the following steps: firstly, the liquid crystal display device comprising a plurality of pixels which are arrangement in matrix; secondly, the polarity of voltage loaded by only one pixel in four which are included in one 2*2 submatrix in the matrix of the pixels is changed in any two adjacent frames; and thirdly, the polarity of voltage loaded by any pixel in the matrix of the pixel is invariable in four continuous frames.

The invention discloses a ripple suppression circuit, a ripple suppression method, and an LED lamp applying the ripple suppression circuit. Ripple reference voltage for representing the ripple is obtained by sampling the ripple from the output voltage of a direct current converter; and controlling the voltage at a load end to change along with the ripple by a transistor based on the ripple reference voltage. Consequently, the voltages at the two ends of the load change along with the ripple so as to enable the voltages of the load to be reduced to constant voltage; and therefore, the ripple acting on the load can be suppressed or eliminated, and the flicker or stroboflash of the LED load is avoided.

A touch panel capable of imparting a variety of characteristics such as anti-glare properties and preventing the scintillation of image light in ultrahigh-definition display elements having a pixel density of 300 ppi or more is provided.

The touch panel includes an optical sheet as a component, in which the optical sheet has an uneven shape on a surface, the uneven shape satisfies at least one condition selected from the following (A) to (C), and the touch panel is used for a front surface of a display element having a pixel density of 300 ppi or more,

• • Condition (A); a gap between inclination angles indicating a half value of a peak value of an inclination angle distribution curve of the uneven shape is in a range of 5 degrees to 15 degrees,
  • Condition (B); an inclination angle indicating an inflection point on a positive direction side of the inclination angle indicating the peak value of the inclination angle distribution curve of the uneven shape is in a range of 4 degrees to 15 degrees, and a difference between the inclination angle indicating the inflection point on the positive direction side and the inclination angle indicating the peak value of the inclination angle distribution curve is in a range of 2.2 degrees to 10 degrees, and
  • Condition (C); the inclination angle indicating the peak value of the inclination angle distribution curve of the uneven shape is in a range of 2 degrees to 8 degrees, skewness of the inclination angle distribution curve of the uneven shape is in a range of 0 degrees to 1.5 degrees, and/or kurtosis of the inclination angle distribution curve of the uneven shape is in a range of 1.5 to 6.

Disclosed is a liquid crystal display device including a thin film transistor substrate, in which changes in the potential at a pixel electrode can be suppressed without decreasing the aperture ratio of a pixel. Gate wiring lines and source wiring lines are covered with a multilayer insulating film made of two layers of interlayer insulating films that overlap each other. Pixel electrodes are formed on the multilayer insulating film, and a shield electrode, which is formed of a transparent conductive material, is provided between the two layers of interlayer insulating films so as to extend along the gate wiring lines and the source wiring lines and to lie between the gate electrodes or the source electrodes and the pixel electrodes.

The invention discloses an LED (Light-Emitting Diode) backlight driving circuit, which comprises a step-up circuit, a driving IC (Integrated Circuit), a discharge module and a detection module, wherein the step-up circuit is used for converting input voltage into required output voltage and supplying the output voltage to an LED unit; the driving IC is used for controlling the step-up circuit to enable the step-up circuit to convert the input circuit into the required output voltage and supply the output voltage to the LED unit; the discharge module is used for releasing charges stored in the step-up circuit after the driving circuit is turned off; the detection module is used for detecting the voltage at the output end of the step-up circuit and generating an enable signal which is used for controlling the working state of the driving IC. In the LED backlight driving circuit provided by the invention, when the driving circuit is turned off and then is quickly turned on again, the detection module can detect the discharge situation of the step-up circuit and the driving circuit is turned on only when the charges stored in the step-up circuit are released and the output voltage is enabled to be smaller than reference voltage, so that the phenomenon of flashing is fully avoided. The invention additionally provides a liquid crystal display with the LED backlight driving circuit.

The invention relates to a pixel array which comprises a plurality of scanning lines, a plurality of data lines, a plurality of first pixels and a plurality of second pixels. The first pixels and second pixels are positioned on two opposite sides of the same data line and connected with the same data line; the first pixels are positioned between the adjacent two odd numbers of scanning lines; and the second pixels are positioned between the adjacent two even numbers of scanning lines. The first pixels are electrically connected with odd number of scanning lines; the second pixels are electrically connected with even number of scanning lines; first transistors of the first pixels and second transistors of the second pixels are arranged in such a manner that a drain electrode overlapping region and a grid electrode overlapping region of the first pixels which are corresponding are synchronously reduced or largened, so that the change trends on grid electrode-drain electrode parasitic capacitances of the pixels caused by the change on the drain electrode overlapping region and the grid electrode overlapping region are consistent, thereby avoiding the problem of non-uniform flickering and picture display. In addition, the invention provides a display panel.

The present invention relates to a liquid crystal panel driving circuit and a LCD. The liquid crystal panel driving circuit comprises a plurality of mutually parallel data lines, a plurality of mutually parallel scan lines in vertical insulated intersection with the data lines, a plurality of thin film transistors positioned at the intersections of the scan lines and the data lines, a plurality of pixel electrodes, a plurality of common electrodes, a comparison circuit and a reversed-phase mean circuit. The pixel electrodes are connected with the data lines via the thin film transistors. The common electrodes are arranged oppositely to the pixel electrodes. The comparison circuit compares the voltage of at least one pixel electrode and the voltage of the data lines connected with the pixel electrode. The reversed-phase mean circuit performs reversed-phase mean calculation to the voltage difference value gained by the comparison circuit, and feeds back the voltage mean value gained to the common electrodes. The liquid crystal panel driving circuit and the LCD can achieve the objective of adjusting liquid crystal clamp voltage automatically so as to avoid picture flicker.