36results about How to "Eliminate afterimage phenomenon" patented technology

The invention relates to the technical field of display, and discloses a pixel drive circuit which comprises a data cable, a grid line, a first power cord, a second power cord, a light-emitting device, a driving transistor, a memory capacitor, a reset unit, a data writing unit, a compensation unit and a light-emitting control unit. The invention further discloses a driving method, an array substrate and a display device. The pixel drive circuit can compensate and eliminate un-uniform display caused by threshold voltage difference of the driving transistor.

A method for quickly eliminating the shutdown afterimage of LCD includes receiving control signal, comparing the first with the second reference voltage, and outputting start signal to the controllerof LCD power supply and fast discharge circuit for fast discharge if the first reference voltage is less than or equal to the second one. Its circuit is composed of manual selector, automatic detector, selection switch, fast discharge circuit and controller of LCD power supply.

The invention provides an LED display system capable of eliminating a ghosting image on an LED display screen and an LED driving circuit. The LED driving circuit comprises a control logic unit and at least one column control circuit, wherein the column control circuit comprises an output driving unit, a ghosting image removing unit and a precharge switch. After a column driving control signal from the control logic unit jumps to be invalid, the output driving unit stops supplying driving current, and the output driving unit is detected by the ghosting image removing unit, so as to determine whether the output driving unit stops supplying the driving current; if the output driving unit stops supplying the driving current, a valid precharge control signal is output to control the precharge switch to be on so as to connect precharge reference voltage and a column wire; thus, the ghosting image of the LED display screen can be eliminated, and the LED driving circuit can be suitable for different driving currents.

The embodiment of the invention provides a circuit for eliminating shutdown ghost shadows and an array substrate and relates to the technical field of display, and the ghost shadows generated after a display device is shut down can be eliminated. The circuit comprises a charging module and a discharging module, wherein the charging module is connected with a first voltage end to be used for storing electric charge under the control of the first voltage signal input by the first voltage end; and the discharging module is connected with the charging module and a second voltage end to be used for providing the electric charge stored by the charging module to a grid line under the control of the second voltage signal input by the second voltage end.

The invention discloses a display device. The display device comprises a display module, a data driver, a power module and a time sequence controller, wherein the data driver is connected with the display module; the power module is respectively connected with the display module and the data driver; and the time sequence controller is respectively connected with the display module, the data driver and the power module for detecting the input voltage of the display module. The invention also discloses a liquid crystal display and a method of eliminating a ghost. When the input voltage of the display module is detected by the time sequence controller to be preset voltage, the time sequence controller inputs a preset black screen signal or a preset white screen signal to the display module through the data driver, the display module displays the preset black screen or the preset white screen, a ghost phenomenon existing in the case of abnormal shutdown is eliminated, and the reliability of products is thus improved.

The invention relates to the technical field of displaying, in particular to a pixel circuit and a driving method thereof. The pixel circuit comprises a driving sub circuit, a resetting sub circuit and a charging sub circuit. The driving sub circuit comprises a driving transistor, a first transistor, a third transistor, a first memory capacitor and a second memory capacitor. The resetting sub circuit is used for conducting discharging on the first memory capacitor and the second memory capacitor under the control of a first scanning signal output by a first scanning signal line. The charging sub circuit comprises a fifth transistor and a sixth transistor. According to the pixel circuit, nonuniformity caused by the threshold voltage of the transistors and the phenomenon of image retention caused by threshold voltage drift can be effectively removed through compensation, and the problem of uneven brightness of an active matrix light-emitting organic electroluminescent display tube due to the fact that the threshold voltages of the driving transistors between light-emitting devices of different pixel cells are different in the active matrix light-emitting organic electroluminescent display tube is solved.

The invention relates to a line recognition module and display equipment. The line recognition module comprises a light source array, an electrochromic device array and an image sensor array, whereinthe electrochromic device array is located between the light source array and the image sensor array; the light source array comprises a plurality of light sources; the electrochromic device array comprises a plurality of electrochromic devices, and the image sensor array comprises a plurality of image sensors; the line recognition module is configured to emit light at a first moment in the firstlight emitting area in the line collection process; an imaging image of the first light-emitting area comprises a first non-imaging area and a first imaging area; and the electrochromism device in thefirst electrochromism area is in a shading state in the grain collecting process, so that light emitted from the light source and reflected by grains is prevented from reaching the first non-imagingarea, and the electrochromism device located outside the first electrochromism area is in a light-transmitting state. According to the embodiment of the invention, the residual image phenomenon occurring when the light source is lightened in a time-sharing manner can be eliminated.

The invention aims at the problem of afterimages of the traditional medical display in the aspect of static image display and the insufficiency in lacking of self-maintenance and maintenance measures for the display to provide a device and a method for afterimage elimination and self-maintenance of a medical display so as to eliminate the afterimages of the medical display and carry out self-maintenance for the medical display regularly. The value of the invention is to provide a practical and feasible solution for eliminating and preventing the afterimages of the medical display, and carrying out the self-maintenance for the medical display, thereby improving the picture display quality of the medical display, prolonging the service life of the medical display and helping a doctor to improve the diagnosis efficiency and accuracy on patient lesions.

The embodiment of the invention relates to the technical field of display screens, in particular to a display screen backlight control circuit and method and a display device. The display screen backlight control circuit comprises a discharging circuit and a switching circuit, wherein the first end of the discharging circuit is used for being connected with the output end of a backlight driving circuit, the second end of the discharging circuit is used for being connected with an earth line, the first end of the switching circuit is used for being connected with the output end of the backlight driving circuit, the second end of the switching circuit is used for being connected with the input end of a backlight source, the third end of the switching circuit is used for being connected with a shutdown control signal line, and the switching circuit conducts connection or disconnection according to signals on a shutdown control signal line. According to the technical scheme, when shutdown occurs, the backlight driving circuit and the backlight source are disconnected through the switching circuit, charges stored in the backlight driving circuit are released through the discharging circuit, and therefore shadow produced by the charges in the backlight driving circuit after shutdown is eliminated.

The invention discloses a source driving device, a polarity reversal control method thereof, and a liquid crystal display device. A polarity signal control unit is added to the source driving device, and the output end of the polarity signal control unit is connected with control ends of a first channel selection module and a second channel selection module in the positive and negative polarity reversal control unit. Trigger control signals inputted to the control end of the polarity signal control unit are adopted to control the reversal condition of polarity reversal control signals outputted by the polarity signal control unit, and particularly, after the trigger control signals are inputted to the control end of the polarity signal control unit at each time, the polarity signal control unit carries out polarity reversal on the original to-be-outputted polarity reversal control signals and then outputs the polarity reversal control signals, or otherwise, the polarity of the original outputted polarity reversal control signals is kept. Thus, the positive and negative polarity reversal control unit carries out control on the polarity of the outputted signals according to the received polarity reversal control signals, a DC residue problem can be avoided, and an afterimage phenomenon is eliminated.

The invention relates to a drive method of color pictures of a flat panel color display. In the drive method, the flat panel color display is used for displaying multi-frame color pictures, and the color picture of each frame comprises an even number of subframe pictures which are respectively displayed in different colors. The drive method of the color pictures comprises the step of sequentially displaying the subframe pictures in the color picture of each frame on the flat panel color display, wherein data of the subframe pictures having the same displaying color in the color pictures of two adjacent frames have opposite polarities.

The invention discloses an LED backlight driving circuit based on low potential end switch control and a backlight driving method. The LED backlight driving circuit comprises a plurality of LED lamp strings 1, a channel control switch device 2, a constant current module 3, a channel switching control module 4, a signal control unit 5 and an SPI interface unit 6. The high potential end of each LED lamp string 1 is directly connected to an LED driving voltage VLED, the low potential end of each LED lamp string 1 is connected with a channel control switch device 2 and a constant current module 3, and the plurality of channel control switch devices 2 in each group of LED lamp strings are connected to a channel switching control module 4; and the channel switching control module 4 is used for controlling the turn-on duty ratio of the LED lamp strings in the group.

The embodiment of the invention provides a method and device for eliminating ghost shadows and a storage medium. The method and device are applied to electronic equipment using a liquid crystal technology. The method comprises the following steps: when it is detected that the duration of displaying the current picture by the liquid crystal screen meets a first preset condition, adjusting the signal amplitude of the image signal transmitted to the liquid crystal screen according to the first preset adjustment trend, and adjusting the backlight brightness of the liquid crystal screen according to the first adjustment amount of the signal amplitude and the second preset adjustment trend, wherein the adjustment direction of the first preset adjustment trend is opposite to the adjustment direction of the second preset adjustment trend. The purpose of avoiding displaying the same picture for a long time is achieved by adjusting the signal amplitude of the image signal transmitted to the liquid crystal screen and the backlight brightness of the liquid crystal screen, so the ghosting phenomenon of the liquid crystal screen is eliminated, and the protection mode of the liquid crystal screenis realized under the condition of not changing the picture display effect.