30results about How to "Eliminate shutdown afterimage" patented technology

The invention relates to a liquid crystal display capable of eliminating residual image after shutdown, which comprises a liquid crystal display panel, a scanning driving circuit and a data driving circuit. The liquid crystal display panel includes a pixel array, a short circuit test circuit and a control unit. The scanning driving circuit is used to scan the liquid crystal display panel, and the data driving circuit is used to provide gray scale voltage to the liquid crystal display panel when the liquid crystal display panel is scanned. The control unit and the short-circuit test circuit constitute a discharge circuit. When the liquid crystal display is powered off, the charges stored in the liquid crystal display panel are quickly released through the discharge circuit.

The invention provides a device for eliminating remnant trace, a shift buffer unit, liquid crystal display equipment and a method. By only matching a delay discharge phenomenon of a high voltage source, which is generated by a power supply device in shutting off, the shift buffer unit is driven, any two signal sources in a plurality of signal sources form high quasi-bits so as to control a discharge switch module to charge and discharge pixel units. The invention not only can solve the problem of the remnant trace in shutting off, but also has the signal resetting function in startup.

The invention provides a shift register circuit, a driving method, a gate-on-array (GOA) circuit and a display device. The shift register circuit comprises a GOA sub circuit including a pull-up node. Besides, the shift register circuit also includes a shutdown control unit that is used for controlling a cut-in voltage output line to apply a cut-in voltage to a gate driving signal output terminal when a shutdown control signal of a display panel is received and controlling the pull-up node to connect a turn-off voltage output line. According to the invention, the shutdown ghost can be eliminated by using the shutdown control unit; and the characteristic drift of the transistor controlled by the pull-up node due to the residual voltage of the pull-up node after shutdown can be prevented, so that an adverse phenomenon can be prevented to a certain extent.

The invention discloses a circuit for eliminating a shutdown afterimage of a liquid crystal display device and the liquid crystal display device using same. The circuit comprises a controller, a voltage detecting circuit, a voltage output circuit, a power supply management chip, a gate electrode driving chip and a TFT. The drain electrode of the TFT is connected with the input end of the voltage detecting circuit. The output end of the voltage detecting circuit is connected with the input end of the controller. The output end of the controller is connected with the first input end of the voltage output circuit. The second input end of the voltage output circuit is connected with the power supply management chip. The output end of the voltage output circuit is connected with the second input end of the gate electrode driving chip. The power supply management chip is connected with the first input end of the gate electrode driving chip. The output end of the gate electrode driving chip is connected with the gate electrode of the TFT. The voltage detecting circuit detects the drain electrode voltage of the TFT and outputs different detecting signals to the controller according to the magnitude of the drain electrode voltage. The controller makes the voltage output circuit generate different gate electrode starting voltages. Furthermore when the liquid crystal display device is shut down, the controller outputs the gate electrode starting voltage to the gate electrode of the TFT.

The invention provides a common circuit for gate driver on array (GOA) test and shutdown ghost elimination. The common circuit is provided with the components of a first test end (3), a test signal line (AT1) which is electrically connected with the first test end (3), a second test end (5), a feedback signal line (AT2) which is electrically connected with the second test end (5), and test thin film transistors (TFT) (T0) of which the number is same with that of a plurality of cascaded GOA unit circuits. Through electrically connecting the gate electrode of each test TFT (T0) with the test signal line (AT1), electrically connecting the source electrode with the feedback signal line (AT2), and electrically the drain electrode with the output end and the gate electrode scanning line of a corresponding GOA unit circuit, the output signal of a random-grade GOA unit circuit in a GOA circuit can be tested, and the specific position of an abnormity in the GOA circuit can be determined. Furthermore residual charges in liquid crystal capacitors and storage capacitors in the liquid crystal panel display area can be released in shutdown, thereby eliminating the ghost in shutdown.

The invention discloses a liquid crystal display and a control method thereof. A time schedule controller is used for detecting an external frequency signal of the liquid crystal display, and a switching control signal is output according to the external frequency signal to start a power-off switching circuit, so that the power-off switching circuit controls the output voltages of a gamma voltagegenerator and a common voltage circuit according one of the messages of the switch control signal respectively; thus, the voltage difference between a pixel electrode of a pixel and a common electrode is regulated to reach zero to completely release the pixel loads after the power off so as to realize the aim of instantly eliminating shutdown images.

The invention provides a liquid crystal display device, which comprises a scanning drive circuit, a reset circuit and a charging circuit, wherein the scanning drive circuit is used for outputting a first electrical level and a second electrical level; the charging circuit is used for maintaining the first electrical level after shutdown; and the reset circuit makes all output of the scanning drive circuit select the first electrical level. The liquid crystal display device can quickly and effectively eliminate the remnant shade of the shutdown.

The embodiment of the invention provides a shutdown residual shadow elimination circuit and a driving method thereof and a display device, relates to the technical field of display, and is used for preventing shutdown of TFT of pixels after power-on of the TFT of the pixels and then enhancing the effect of shutdown residual shadow elimination. The circuit comprises a comparator, a control module and an output module. The comparator is used for outputting high level voltage when same-end voltage is greater than reverse-end voltage and outputting low level voltage when the same-end input voltage is less than or equal to the reverse-end input voltage. The control module is used for leveling voltage of a control node and voltage of a second level end when the comparator outputs high level voltage and leveling voltage of the control node and voltage of a third level end when the comparator outputs low level voltage. The output module is used for outputting voltage of a fourth level end at a signal output end when voltage of the control node is voltage of the third level end and outputting voltage of a fifth level end at the signal output end when voltage of the control node is voltage of the second level end.

The invention discloses a grid electrode drive circuit. The grid electrode drive circuit comprises multiple stages of grid electrode drive units. Each stage of grid electrode drive unit comprises a pre-charging module, a pull-up module, a pull-down module and a resetting module. Each stage of grid electrode drive unit receives a first time sequence signal, a second time sequence signal, a next stage of grid electrode drive signal output to the next stage of grid electrode drive unit, a former stage of grid electrode drive signal output to the former stage of grid electrode drive unit and a resetting signal. The invention further provides a display device. The resetting modules in grid electrode drive circuit and the display device enable the grid electrode drive signal of each stage of grid electrode drive unit to output high potential simultaneously when the resetting signals are high potentials, thereby discharging accumulated electricity loads in a liquid crystal capacitor soon and further eliminating shut-down residual images.

The application provides a display device and a shutdown driving method thereof. The display device comprises a display panel, a common electrode and a control unit. The display panel includes at least one scan line, at least one data line intersecting with the at least one scan line, and at least one active switch connected with the at least one scan line and the at least one data line. The common electrode is arranged on the display panel and is connected with the at least one active switch, and the common electrode has a common electrode voltage. The control unit has one or more control switches, wherein a first end of the control switch is coupled to the common electrode, a second end is coupled to a discharge module, and a control end is coupled to a switching voltage. The state of the control switch is regulated according to the voltage difference between the switching voltage and the common electrode voltage.

The invention discloses a power supply management circuit which is arranged in a display device. The display device further comprises a grid drive circuit, a source drive circuit and a pixel array. The power supply management circuit comprises a determining module, an output module and a control module; the determining module receives a power supply voltage and a backlight voltage, and determineswhether the display device is in a normal ON / OFF state or a voltage drop test according to the power supply voltage and backlight voltage; under control of the determining module, the output module outputs an enablement signal; the input end of the control module is connected with the determining module, the output end of the control module is connected with the grid drive signal to provide a triggering signal, when the triggering signal is valid, the grid drive circuit resets the pixel array, and when voltage drop test is carried out on the display device aimed at the power supply voltage, the trigger signal is invalid. Thus, the efficiency of voltage drop test can be improved, and the display device is avoided from influence on elimination of a shutdown ghost.

Provided is a control method for eliminating the shutdown ghost and a display device and a driving device using the same, wherein the display device includes a display panel, a source driver and a control device. The display panel includes a plurality of pixels, wherein the source driver is used for providing the pixel voltage to teh pixel, and the control device is used for receiving the control signal, and determining whether providing a first voltage to the pixel according to the control signal, and determining whether the source driver provides the pixel voltage to the pixel. When the system voltage of the display device is smaller than the scheduled voltage, the control device determines that the source driver stops providing the pixel voltage to the pixel and the control device provides the first voltage to the pixel.

A display device and a method for eliminating power-off residual image thereof are provided. The display device comprises a display panel; a gamma voltage generation unit connected to the display panel through a plurality of gamma voltage lines; a voltage regulating unit connected to the display panel through a reference voltage line; a control unit connected between the reference voltage line andthe plurality of gamma voltage lines; a power supply unit that transmits a control signal to the control unit; when the control unit acquires that the control signal is at a first potential, the reference voltage line and the plurality of gamma voltage lines are short-circuited.

The invention discloses a grid electrode drive circuit. The grid electrode drive circuit comprises multiple stages of grid electrode drive units. Each stage of grid electrode drive unit comprises a pre-charging module, a pull-up module, a pull-down module and a resetting module. Each stage of grid electrode drive unit receives a first time sequence signal, a second time sequence signal, a next stage of grid electrode drive signal output to the next stage of grid electrode drive unit, a former stage of grid electrode drive signal output to the former stage of grid electrode drive unit and a resetting signal. The invention further provides a display device. The resetting modules in grid electrode drive circuit and the display device enable the grid electrode drive signal of each stage of grid electrode drive unit to output high potential simultaneously when the resetting signals are high potentials, thereby discharging accumulated electricity loads in a liquid crystal capacitor soon and further eliminating shut-down residual images.

The invention relates to a liquid crystal display which can eliminate a power-off remnant shade, which comprises a liquid crystal display panel, a scanning drive circuit and a data drive circuit. Theliquid crystal display panel comprises a pixel array, a short circuit test circuit and a control unit. The scanning drive circuit is used to scan the liquid crystal display panel, and the data drive circuit is used to provide a grey scale voltage for the liquid crystal display panel when the liquid crystal display panel is scanned. The control unit and the short circuit test circuit are formed into a discharge circuit, when the liquid crystal display is powered off, and charge stored inside the liquid crystal display panel is released rapidly through the discharge circuit.

Embodiments of the present disclosure provide a shift register, a gate driving circuit, a display panel and a display apparatus. The shift register comprises an inputting sub-circuit, an outputting sub-circuit, a resetting sub-circuit, and a first discharging controlling sub-circuit. The first discharging controlling sub-circuit is coupled to a first controlling signal inputting terminal, a second controlling signal inputting terminal and a signal outputting terminal, and configured to provide a second controlling signal from the second controlling signal inputting terminal to the signal outputting terminal under a control of a first controlling signal from the first controlling signal inputting terminal. The signal outputting terminal is set to a high level by inputting the first controlling signal and the second controlling signal to the shift register.

The invention provides a device for eliminating remnant trace, a shift buffer unit, liquid crystal display equipment and a method. By only matching a delay discharge phenomenon of a high voltage source, which is generated by a power supply device in shutting off, the shift buffer unit is driven, any two signal sources in a plurality of signal sources form high quasi-bits so as to control a discharge switch module to charge and discharge pixel units. The invention not only can solve the problem of the remnant trace in shutting off, but also has the signal resetting function in startup.

The embodiment of the invention discloses a quick power-down circuit and a display device. The quick power-down circuit comprises: a power supply unit which comprises a power supply input end and a power supply output end; a control unit which comprises a control input end and a control output end, wherein the control input end receives a first level signal provided by the display panel level conversion circuit, and the control unit is used for outputting a discharge control signal through the control output end according to the jump of the first level signal in the power-down state; a discharging unit which is electrically connected between the power supply output end and the grounding end, wherein the control end of the discharging unit is electrically connected with the control output end, and the discharge unit is used for switching from a cut-off state to a conducting state according to the discharge control signal. According to the embodiment of the invention, the problem that shutdown ghosting is easily caused due to slow discharge speed of the common electrode of the existing display panel is solved, charges in the common electrode can be rapidly led out, the rapid discharge effect is realized, the shutdown ghosting is effectively eliminated, and good user experience is ensured.

The invention discloses a liquid crystal display and a control method thereof. A time schedule controller is used for detecting an external frequency signal of the liquid crystal display, and a switching control signal is output according to the external frequency signal to start a power-off switching circuit, so that the power-off switching circuit controls the output voltages of a gamma voltagegenerator and a common voltage circuit according one of the messages of the switch control signal respectively; thus, the voltage difference between a pixel electrode of a pixel and a common electrode is regulated to reach zero to completely release the pixel loads after the power off so as to realize the aim of instantly eliminating shutdown images.

The invention discloses a voltage conversion circuit and display equipment. The voltage conversion circuit comprises a phase inverting unit and a conversion unit; the phase inverting unit is used foroutputting a low-potential phase inverting signal according to a first reference signal pulled up to the high potential, a time sequence signal and a low-potential second reference signal when the display equipment is shut down; and the conversion unit is used for outputting a high-potential third reference signal to a GOA unit according to the low-potential inverting signal, the first reference signal pulled up to the high potential, the time sequence signal and the low-potential second reference signal, so that the GOA unit controls a pixel driving unit to be conducted and releases residualcharges on a pixel electrode. Shutdown afterimage are eliminated.

The invention discloses a power supply management circuit which is arranged in a display device. The display device further comprises a grid drive circuit, a source drive circuit and a pixel array. The power supply management circuit comprises a determining module, an output module and a control module; the determining module receives a power supply voltage and a backlight voltage, and determineswhether the display device is in a normal ON / OFF state or a voltage drop test according to the power supply voltage and backlight voltage; under control of the determining module, the output module outputs an enablement signal; the input end of the control module is connected with the determining module, the output end of the control module is connected with the grid drive signal to provide a triggering signal, when the triggering signal is valid, the grid drive circuit resets the pixel array, and when voltage drop test is carried out on the display device aimed at the power supply voltage, the trigger signal is invalid. Thus, the efficiency of voltage drop test can be improved, and the display device is avoided from influence on elimination of a shutdown ghost.

The invention discloses a circuit for eliminating a shutdown afterimage of a liquid crystal display device and the liquid crystal display device using same. The circuit comprises a controller, a voltage detecting circuit, a voltage output circuit, a power supply management chip, a gate electrode driving chip and a TFT. The drain electrode of the TFT is connected with the input end of the voltage detecting circuit. The output end of the voltage detecting circuit is connected with the input end of the controller. The output end of the controller is connected with the first input end of the voltage output circuit. The second input end of the voltage output circuit is connected with the power supply management chip. The output end of the voltage output circuit is connected with the second input end of the gate electrode driving chip. The power supply management chip is connected with the first input end of the gate electrode driving chip. The output end of the gate electrode driving chip is connected with the gate electrode of the TFT. The voltage detecting circuit detects the drain electrode voltage of the TFT and outputs different detecting signals to the controller according to the magnitude of the drain electrode voltage. The controller makes the voltage output circuit generate different gate electrode starting voltages. Furthermore when the liquid crystal display device is shut down, the controller outputs the gate electrode starting voltage to the gate electrode of the TFT.

The invention provides an array substrate, a display device and a driving method of the display device, and relates to the technical field of display. The voltage of a pixel can be charged to be saturated faster, and then the Mura problem of the display device is relieved. The array substrate comprises a plurality of grid lines and a plurality of data lines, and the data lines extend to a non-display region from a display region; in the display region, the grid lines and the data lines intersect to define sub-pixels; the non-display region comprises a switching module. The switching module is connected with the grid lines and control lines and used for being controlled by the control lines to be started, the grid lines are electrically connected, and the grid lines have start signals, so that reference voltage input by the data lines when the array substrate works is output to the sub-pixels. The reference voltage is between a positive polarity data voltage value and a negative polarity data voltage value input by the data line on adjacent frames.

An array substrate includes: a scanning driving unit for providing a row scanning signal to a plurality of gate lines, and a data driving unit for providing a data signal to a plurality of data lines, the plurality of gate lines and the plurality of data lines being horizontally and vertically crossed to form an array of pixel units arranged in an matrix form, and further including: a control unit electrically connected with the scanning driving unit and the data driving unit respectively, for controlling the scanning driving unit turn on each of the pixel units when the display device is powered off, such that charges stored in the pixel units are rapidly discharged through the data lines, so as to eliminate the shutdown image sticking of the AMOLED display. There have disclosed also a method for driving array substrate and a display device.