255results about How to "Solve flickering" patented technology

The invention provides a dimmable LED (Light-Emitting Diode) driving circuit and a driving method. An input current in a first power-level circuit is controlled as a square wave signal within a rectifier conducting time interval by an input current control circuit, the peak value of the input current is a constant value and meets the requirement of the minimum load current of an electronic transformer, and the valley value of the input current is zero; and the input current is kept at zero within a rectifier nonconducting time interval. The load current of the electronic transformer can be kept larger than the minimum load current, and thus, a normal working state can be kept in the working process, and the problem of LED load flicker caused by the switching off of the electronic transformer is avoided; in addition, information on the input current is detected through a dimmable signal generating circuit so that a dimmable signal for representing information on a conduction angle of a rectifier is obtained, an LED load is precisely dimmed, the dimming range is wide, and the dimming effect is good; and finally, constant-current control for the current of the LED load is realized by an output current control circuit, and therefore, the brightness stability of the LED load is ensured.

The invention discloses a touch control display panel, a driving method and a touch control display device. The touch control display panel comprises a substrate, a control unit, a plurality of public electrode blocks, a plurality of first wires, a plurality of second wires and at least two third wires, wherein the substrate comprises a display area and a non-display area, the control unit is arranged in the non-display area; the public electrode blocks are arranged in the display area at intervals in an array mode, reused as touch control electrodes and are divided into at least two public electrode groups according to the distance from the control unit; the first wires are in electric connection with the first public electrode blocks respectively; the second wires are in electric connection with the control unit, each second wire is in electric connection with the corresponding first wire in the touch control stage and inputs a touch control signal to the first wire; at least two third wires are in electric connection with the control unit, and the third wires are in electric connection with the first wires corresponding to the public electrodes in the display stage. The touch control display panel, the driving method and the touch control display device can solve the technical problems of display screen flash and image adhesion and improve the display effect of a display screen.

The invention discloses an urban microscopic traffic flow simulation system based on a cellular machine, which comprises a simulated inner core, an initialization model, a human-computer interaction model, a database management system and an induction and control coordination system. The initialization model consists of a road network generating model, a vehicle generating model and a control and induction device generating model; the simulated inner core consists of a vehicle running model and a control and induction device running model; and the human-computer interaction model is in charge of the setting of a user on various parameters in the simulation system and the screen display work of a whole traffic network. The invention researches the overall design of the urban microscopic traffic flow simulation system, various running rules of vehicles at different road network positions and other necessary component parts for constructing the simulation system, mainly starts with the realization of the whole microscopic traffic flow simulation system to provide an overall framework of program running, and carries out corresponding simplification for certain complex independent parts so that the realization of the system is more feasible.

The invention discloses a dimming circuit compatible with a silicon controlled rectifier dimmer and a control method. The dimming circuit includes an input voltage source, a rectification circuit, the silicon controlled rectifier dimmer, a dimming circuit and an output circuit, wherein the input voltage source is connected with the rectification circuit and the silicon controlled rectifier dimmer respectively, the rectification circuit is connected with the dimming circuit, the dimming circuit is connected with the output circuit, and the output circuit includes an isolation transformer, a switch tube, a third sampling resistor, a flyback diode, a filtering capacitor and an output LED load. The dimming circuit compatible with the silicon controlled rectifier dimmer is characterized in that the dimming circuit includes a sampling circuit used for sampling the phase-cut angle of the silicon controlled rectifier dimmer, a control and logic circuit which is controlled by the phase-cut angle, and a phase-cut angle setting circuit which can control the switching on and switching off of the switch tube according to the status of an inputted phase-cut angle. With the dimming circuit compatible with the silicon controlled rectifier dimmer of the invention adopted, the problem of flicker appearing in a traditional dimming process can be effectively solved, and at the same time, a dimming purpose can be achieved.

The application provides a method for controlling the state of a light sensor and electronic equipment, and relates to the technical field of communication. The method can be applied to the electronicequipment with the light sensor under a full screen, and is used for controlling the light sensor to emit a light signal when pixels of a display area of an OLED display screen corresponding to the light sensor do not emit light in a refresh period of a picture, so that the problem of screen flicker caused by infrared light emission of the light sensor on the full screen can be solved, and the display effect of the full screen is improved. The method comprises the steps of: determining a display time period and a non-light-emitting time period in a refresh period of a picture by a processor;controlling, by the processor, a light emitter of the light sensor to emit a light signal when the pixels of the display area of the OLED display screen corresponding to the light sensor do not emit light in the refresh period of the picture; and controlling, by the processor, the light emitter to not emit a light signal when the pixels of the display area of the OLED display screen correspondingto the light sensor emit light.

The invention relates to a light-emitting diode (LED) dimming driving system with a silicon controlled bypass dimming circuit. The LED dimming driving system with the silicon controlled bypass dimming circuit comprises an alternating current / direct current (AC / DC) LED constant current actuator and a LED light string, wherein the input end of the AC / DC LED constant current actuator is electrically connected with an alternating current electric supply, the output end of the AC / DC LED constant current actuator is connected with the LED light string, the silicon controlled bypass dimming circuit is arranged, the input end of the silicon controlled bypass dimming circuit is connected with the alternating current (AC) electric supply, and the output end of the silicon controlled bypass dimming circuit is connected with a dimming interface of the AC / DC LED constant current actuator. The AC / DC LED constant current actuator obtains energy from the AC electric supply, and outputs a constant current value to drive the LED light string. The AC / DC LED constant current actuator is provided with an analog dimming interface which is used for adjusting an output current value according to an analog voltage amplitude value of an input dimming signal so as to change luminance of the LED light string. According to the silicon controlled bypass dimming circuit, the input end of the silicon controlled bypass dimming circuit is connected with the AC electric supply, and the output end of the silicon controlled bypass dimming circuit generates a smooth direct current analog voltage signal to serve as a dimming signal which is input into the analog dimming interface of the AC / DC LED constant current actuator. The value of amplitude of the dimming signal output by the silicon controlled bypass dimming circuit can be adjusted by adjusting an adjustable knob of the silicon controlled bypass dimming circuit, and thus a current value and the luminance of the LED light string can be adjusted.

The invention provides a pixel circuit and a driving method thereof, a display panel and a display device. The pixel circuit comprises eight transistors, two storage capacitors and an organic light emitting device (OLED), a threshold voltage of the first transistor is compensated through mutual cooperation of the transistors and the capacitors, a driving current for driving the OLED to emit lightis made to be independent of the threshold voltage of the first transistor, so influence of fluctuation of the threshold voltage of the first transistor on the OLED is avoided, a problem of uneven display brightness caused by this is solved, the display effect of the whole frame is improved, moreover, since the leakage current between the first storage capacitor and the second storage capacitor can be reduced by the eighth transistor, reduction of a gate voltage of the first transistor is avoided, a problem of scintillation caused by the leakage current is solved, and the display effect of thewhole display frame is further improved.

The invention relates to a liquid crystal display panel, a manufacturing method of the liquid crystal display panel and a display apparatus. The liquid crystal display panel comprises an array substrate and an opposed substrate which is arranged opposite to the array substrate, wherein the array substrate comprises a first underlayer substrate and a common electrode pattern arranged on the first underlayer substrate, the opposed substrate comprises a second underlayer substrate and a black matrix pattern arranged on the second underlayer substrate, and the common electrode pattern is electrically connected with the black matrix pattern. By adopting the liquid crystal display panel, the interference on the alignment of liquid crystals caused by the electrification of the black matrix pattern can be prevented, and the problem that the liquid crystal display panel is abnormal in picture color or flashes due to the electrification of the black matrix pattern can be solved.

A liquid crystal apparatus comprises scanning electrodes and data electrodes intersecting with each other to form a pixel at each intersection, and a ferroelectric liquid crystal disposed between the scanning electrodes and data electrodes. The apparatus includes a first unit for applying to the scanning electrodes at least two scanning selection signals in at least two vertical scanning periods; the scanning selection signals having mutually different waveforms and each having a pulse of one or the other voltage polarity with respect to the level of a voltage applied a scanning electrode when it is not selected; and a second unit for applying data pulses to the data electrodes in phase with said pulse of one or the other voltage polarity. The first unit and second unit in combination apply a fore voltage pulse to a pixel on a scanning electrode selected by application of the pulse of one or the other voltage polarity prior to each application of a writing voltage formed by combination of the pulse of one or the other polarity and an information pulse. The fore voltage pulse has a polarity opposite to that of the writing voltage and an amplitude which is +E,fra 1 / 2+EE or less of that of the writing voltage.

The invention relates to a high-power factor LED (light-emitting diode) driving circuit supporting silicon controlled rectifier dimming. A replacement type low-power LED driver implemented by the invention is an electrical isolation type circuit, the circuit adopts a flyback conversion topological structure, an isolation type transformer is used for performing energy storage and transmission, and an external three-end silicon controlled rectifier dimmer is used for dimming. In order to realize a dimming function, the use of a switching power supply management chip NXPSSL2101T integrating an MOSFET (metal oxide semiconductor field-effect transistor), the use of a three-end silicon controlled rectifier dimming switch for producing input signals, the use of a resistor voltage division way for producing brightness control signals and the like are considered. In order to realize a high power factor, the use of a valley-fill PFC (power factor correction) circuit is considered, and the valley-fill PFC circuit comprises three capacitors and two diodes. Under low-power limitation, the flyback conversion topological structure is adopted for realizing higher efficiency. The high-power factor LED driving circuit disclosed by the invention improves the circuit integration level, the power factor and the circuit conversion efficiency.

The embodiments of the invention provide an image display method. When an input image signal is received, the display apparatus firstly adjusts its own refreshing frequency as the frequency for the input image signal and generates a synchronized field synchronization signal while generating an output image signal. Then, the display apparatus uses the ascending edge of the field synchronization signal as a triggering edge to output a backlight drive signal so that the backlight illumination of the display apparatus is synchronized with the image display of the display apparatus. Since the refreshing frequency of the display apparatus is identical to the frequency of the input image signal, the frequency of the output image signal of the display apparatus is supposed to be also identical to the frequency of the input image signal. Therefore, in the process of displaying an image, the image could be displayed continuously. Further, as the backlight illumination of the display apparatus is synchronized with the image display, the flashing of image does not occur in the process of displaying the image.

The invention discloses a pixel driving circuit, a display panel and a driving method. The pixel driving circuit comprises a driving transistor, a data writing module, a light emitting control module,a threshold compensation module and a bias adjusting module. The control end of the driving transistor is connected with a first node, the first end of the driving transistor is connected with a third node, and the second end is connected with a second node; the light-emitting control module is connected with the driving transistor and the light-emitting element in series; the threshold compensation module is connected in series between the control end of the driving transistor and the second end of the driving transistor; the first end of the bias adjusting module is connected with the biassignal end, the second end of the bias adjusting module is connected with the second end of the driving transistor, and the control end of the bias adjusting module is connected with the first controlsignal end to adjust the potential difference between the gate potential and the drain potential of the driving transistor T; and influence on the internal characteristics of the driving transistor when the gate potential of the driving transistor T in the non-bias stage is greater than the drain potential of the driving transistor is balanced.

The embodiment of the invention discloses a display screen frequency conversion method, a DDIC chip, a display screen module and a terminal. The method comprises the steps of outputting a TE signal toan AP according to a first basic refresh rate, and performing image scanning and frame compensation according to the first basic refresh rate; receiving a frequency reduction instruction issued by the AP, wherein the frequency reduction instruction is used for indicating to reduce the basic refresh rate of the display screen; and outputting a TE signal to the AP according to the frequency reduction instruction and a second basic refresh rate, and continuing to perform image scanning and frame compensation according to the first basic refresh rate, the second basic refresh rate being smaller than the first basic refresh rate. In the embodiment of the invention, while the AP can reduce the image drawing frequency according to the TE signal after frequency reduction, the DDIC chip can reducethe implementation complexity and cost of frequency conversion of the display screen by keeping the original scanning frequency and compensation frequency, so that the problem of picture flickering caused in the frequency conversion process is avoided, and therefore, the picture display quality in the frequency conversion process is improved.

The method for driving back lights comprising red light, blue light and green light includes: dividing a picture displaying area into four sub-areas, the green light is lighted twice respectively in two sub-areas of the first picture-displaying area; the three lights are lighted respectively in a first order in the four sub-areas of the first picture-displaying area, and lighted respectively in a second order in the second picture-displaying area. In which, the first order is different from the second order.

The invention provides a method and a device for controlling the state of a screen. The method comprises the following steps: when a mobile terminal is in a strong-light environment, entering a strong-light mode, and acquiring multiple light intensity values collected continuously by an ambient light sensor within a preset time; analyzing the change characteristics of the acquired light intensity values within the preset time to judge whether the mobile terminal leaves the strong-light environment; if the mobile terminal leaves the strong-light environment, exiting from the strong-light mode, and adjusting a current distance threshold to enable a proximity sensor to report a screen control event according to the adjusted distance threshold; and acquiring a screen control event reported by the proximity sensor, and controlling the state of the screen according to the screen control event. According to the invention, whether a mobile terminal really leaves a strong-light environment can be judged accurately, the proximity sensor can accurately report a screen control event under control according to the environment of the mobile terminal and based on a corresponding distance threshold, and the problem of screen flicker can be solved effectively.

The invention provides an adaptive hierarchical structure light-based touch detection system and method. The system comprises a touch detection unit, a projection unit, an image sensing unit and a control unit, wherein the touch detection unit is used for receiving original interface image data from the exterior of the system, receiving a projection region image data photographed by the image sensing unit and processing the image data, and acquiring and outputting touch information of a touched object; the projection unit is used for projecting an original interface image to a projection plane to image; the image sensing unit is used for acquiring and outputting the projection region image data; and the control unit is used for controlling ordered cooperative work between every two units and controlling the synchronization between the projection unit and the image sensing unit. By using a structure light three-dimensional measurement principle, the distance between the touched object and the projection plane can be accurately measured, and the measurement precision and the touch detection accuracy are guaranteed; the amount of calculation of structure light generation and extraction is reduced; and the problem of flickering of hidden embedded structure light or image quality reduction is effectively solved.

The invention discloses a picture processing method and device for video playing. The picture processing method comprises the following steps of: acquiring frame pictures of a currently-playing video at the end of the video playing; and outputting the frame pictures of the currently-playing video to a graphic display layer, and displaying the frame pictures by using video playing equipment. According to the picture processing method and device for the video playing, the problems of blank screen and blinking at the end of the video playing in the prior art are solved, and thus, the eyes of users are better protected.

The invention discloses a display panel and a display device. The display panel comprises a pixel circuit, the first reset module comprises a first double-gate transistor, and a first intermediate node of the first double-gate transistor is electrically connected with a light-emitting control signal line through a first capacitor; the compensation module comprises a second double-gate transistor, a gate of the second double-gate transistor is electrically connected with a second scanning signal line, and a second intermediate node of the second double-gate transistor is electrically connected with a light-emitting control signal line through a second capacitor; wherein the first double-gate transistor comprises a first stray capacitor, the second double-gate transistor comprises a second stray capacitor, the first capacitor corresponds to the first stray capacitor, the second capacitor corresponds to the second stray capacitor, and the capacitance of at least one of the first capacitor and the second capacitor is larger than or equal to the capacitance of the corresponding stray capacitor. According to the embodiment of the invention, the problem that the display panel is easy to flicker in a low-frequency mode can be solved.

The invention provides a method and system for setting backlight brightness rapidly. The method comprises: after a screen backlight lightening signal is received, an ambient light sensor having an initial ambient light measurement integration period is used for carrying out ambient light detection, wherein the initial ambient light measurement integration period is less than time consumed for screen backlight lightening; according to a detection result of ambient light detection, an ambient light intensity value is obtained; on the basis of the ambient light intensity value, screen backlight lightening operation is carried out; and after the backlight lightening operation, the ambient light measurement integration period is modified from the initial ambient light measurement integration period into a preset value. In addition, the invention also provides a system for setting backlight brightness rapidly. According to the invention, the initial ambient light measurement integration period less than the time consumed by the screen backlight lightening is set and the ambient light intensity value is obtained; and according to the ambient light intensity value, the screen backlight brightness is set. Therefore, a problem of flickering caused by adjusting the screen backlight brightness after screen lightening in the prior art is solved.

The invention relates to a liquid crystal display panel, which comprises a plurality of gate lines, a charge storage element and a discharging control element, wherein the tail ends of the gate linesare connected with gate signal delay compensation devices at all levels respectively; the gate signal delay compensation device at each level comprises a charging control element which is connected with the tail end of the gate line at the previous level; one end of the charge storage element is connected with the charging control elements, and the other end of the charge storage element is connected with low-level voltage; and the discharging control element is connected with the charge storage element and is used to control the charge storage element to discharge electricity to the gate lineat the level. The liquid crystal display panel can effectively avoid bad display effects caused by gate signal delays.

The invention is suitable for the field of driving of a LED and provides a pulse modulation control method and a pulse modulation control device for driving the LED. In the invention, according to received address information, gray level data of an LED lamp bank corresponding to the address information is acquired; then a pulse modulation signal or a plurality of pulse modulation signals with the same or special duty ratio are generated in a pulse modulation period according to preset parameters by combining the gray level data; and one pulse modulation signal is stored in a first preset storage space or a plurality of pulse modulation signals with the same or special duty ratio are stored in the first preset storage space to form a plurality of continuous pulse modulation signals with periodicity, so that the brightness of the LED in the working process is ensured to be changed smoothly without the phenomenon of blink or nonuniform brightness, and thus, the problems of blink and nonuniform brightness when the LED light-emitting device works, which are caused by a pulse modulation mode provided in the prior art, are solved.

The invention provides a liquid crystal display device. Each pixel unit on an array substrate comprises a first sub-pixel and a second sub-pixel; a visual angle control electrode on a colored film substrate comprises a first electrode part and a second electrode part which are insulated from each other; the first electrode part correspondingly covers one of the first sub-pixel and the second sub-pixel of each pixel unit; the second electrode part correspondingly covers the other one of the first sub-pixel and the second sub-pixel of each pixel unit; and a first alternating-current control voltage and a second alternating-current control voltage are separately applied to the first electrode part and the second electrode part, the polarity of the first alternating-current control voltage isopposite to the polarity of the second alternating-current control voltage, and the potential difference between the first electrode part and a common electrode and the potential difference between the second electrode part and the common electrode are equal or the equivalent potential difference between the first electrode part in two frames of pictures in a period and the common electrode and the equivalent potential difference between the second electrode part in the two frames of pictures in the period are equal. According to the driving framework, by complementarity and phase difference of the two alternating-current voltages, bright difference is generated between the two sub-pixels in each pixel unit to carry out brightness compensation, and thus, the problem of flashing of a panelis solved.

The invention discloses a multi-purpose demultiplexing circuit and a display device, and belongs to the field of display technology. The multi-path demultiplexing circuit comprises: n first data lines, n switch groups respectively connected with the n first data lines, a switch driving circuit, m switch control lines connected to the switch driving circuit, a compensation drive circuit and m-1 compensation lines connected to the compensation drive circuit, wherein n and m are an integer greater than 1. The m-1 compensation lines respectively compensate gated feed-through voltage caused by theclosing of m-1 non-last gating switches; and gated feed-through voltage caused by the closing of the last gating switch is not compensated or compensated by being regulated along with compensating voltage difference caused by m-1 compensation signals with common voltage according to situations. Only by additionally arranging m-1 compensation lines, the effect of uniformity of feed-through voltagereceived by each column of pixels can be achieved. Thereby, the problem of poor display caused by the closing of the gating switches can be solved; and circuit space can be saved, and additional powerconsumption brought by the compensation is lowered.

The invention discloses an exposure device and an exposure method for an electronic endoscope. The exposure device comprises an image detection module, an image processing module and an image output module, wherein the image detection module comprises an image detector, a brightness statistics module and a shutter value control module. The exposure method comprises the following steps: transmitting a video signal of a detection region to the brightness statistics module by the image detector, obtaining a current brightness value Yc and a target brightness value Ya through the brightness statistics module, and transmitting the current brightness value Yc and the target brightness value Ya to the shutter value control module; calculating a target shutter value Sa and controlling a shutter to reach proper exposure quantity by the shutter value control module; sending the video signal of the detection region under the proper exposure quantity to the image processing module by the image detector; performing image processing on the received video signal by the image processing module, and transmitting the processed video signal to the image output module for outputting. According to the exposure device and the exposure method, a detection image is relatively clear, a situation of overexposure or over-darkness is avoided, the exposure speed is increased, and the problems of dazzling and flickering of the image are solved.

The invention discloses a multimedia touch switch panel, which comprises a current detection circuit, a thyristor, a control module, a zero cross detection circuit and a capacitive touch screen assembly, wherein a central processing module is electrically connected with the control module; an infrared proximity induction module is connected to the central processing module; the current detection circuit and the thyristor are connected between a lamp fire line connection terminal and an electric supply fire line connection terminal in series; a zero line connection terminal and the lamp fire line connection terminal are connected with a thyristor starting current circuit and a dynamic current maintaining circuit in parallel; and a dynamic rectifier-amplifier circuit is arranged between the current detection circuit and the control module, and dynamically adjusts whether the dynamic current maintaining circuit is enabled or not according to a detection current signal from the current detection circuit. According to the multimedia touch switch panel, the condition that the thyristor is unexpectedly conducted due to bearing over-high counter electromotive force in a current switching process is avoided; the condition that current which flows through the control module flows through an LED lamp is avoided; and the phenomenon that the originally controlled LED lamp flickers or cannot be turned off is also avoided.

The invention discloses an image processing method and device. The method comprises the steps that when it is determined that the polarity of a polar signal of a to-be-displayed image of this frame is the same as that of a polar signal of a to-be-displayed image of the previous frame according to received to-be-displayed images of all the frames and the to-be-displayed image of this frame is static relative to the to-be-displayed image of the previous frame, reducing processing is performed on the grey scale of the to-be-displayed image of this frame according to a preset first compensation corresponding relation. Reducing processing compensation is performed on the grey scale of the to-be-displayed image of the frame of which the polarity of the polar signal is reversed when the static image is displayed, that is, the to-be-displayed image of the frame of which the polarity of the polar signal is the same as that of the polar signal of the to-be-displayed image of the previous frame, therefore, on the condition that the common voltage for image displaying and the display refreshing frequency do not need to be changed, the image flickering problem caused by the overcharging phenomenon which possibly occurs when the static image is displayed can be avoided to the maximum limit, and the side effects such as power dissipation increasing and the nonuniform image quality cannot be brought about.

The invention relates to a two-dimensional display and a drive method thereof. The two-dimensional display is provided with a plurality of pixels which at least comprise a first pixel and a second pixel. The drive method for the two-dimensional display comprises the following steps of: driving the first pixel according to a first grey value in a first subframe period of a frame period and drivingthe second pixel according to a second grey value; and driving the first pixel according to a third grey value in a second subframe period of the frame period and driving the second pixel according to a fourth grey value, wherein the first grey value is less than the third grey value; the average value of the first grey value and the third grey value is equal to a first target grey value; the second grey value is more than the fourth grey value; and the average value of the second grey value and the fourth grey value is equal to a second target grey value.

The invention discloses a method and a device for adjusting backlight brightness of a terminal screen. When the terminal starts an automatic backlight mode and the acquired ambient light intensity value L and an ambient light intensity value acquired subsequently change, a change value of tilt angles of the terminal at before-after two times is calculated, according to the preset mapping relationship between change values of different tilt angles and each corresponding light intensity attenuation ratio, the ambient light intensity value L and the light intensity attenuation ratio corresponding to the tilt angle change value are combined to calculate a theoretical ambient light intensity value obtained after an angle change happens to the terminal, if the actual ambient light intensity value M is larger than the theoretical ambient light intensity value, the screen backlight brightness of the terminal is adjusted according to the actual ambient light intensity value M, or otherwise, the backlight brightness of the terminal screen is not adjusted. After the method and the device are applied, when the ambient light intensity changes, the terminal can truly recognize whether the real ambient light changes, and thus, the backlight brightness of the terminal screen can be accurately adjusted.

The invention discloses a backlight brightness adjustment method for a display screen and a mobile terminal. The method comprises the following steps: obtaining shaking frequency of the mobile terminal, matching a preset frequency section to which the shaking frequency belongs, wherein each preset frequency section corresponds to a backlight brightness adjustment strategy, and adjusting the backlight brightness of the display screen in the mobile terminal according to the backlight brightness adjustment strategy corresponding to the preset frequency section to which the shaking frequency belongs. By adopting the backlight brightness adjustment method disclosed by the invention, the flicker problem of the backlight brightness of the display screen in the mobile terminal is avoided, the service life of the display screen is prolonged, the visual acuity of a user is protected and the user experience is greatly improved.