CN112735346A - Shutdown control circuit, shutdown control method and display device - Google Patents
Shutdown control circuit, shutdown control method and display device Download PDFInfo
- Publication number
- CN112735346A CN112735346A CN202011608865.8A CN202011608865A CN112735346A CN 112735346 A CN112735346 A CN 112735346A CN 202011608865 A CN202011608865 A CN 202011608865A CN 112735346 A CN112735346 A CN 112735346A
- Authority
- CN
- China
- Prior art keywords
- signal
- control signal
- control
- display device
- shutdown
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/027—Arrangements or methods related to powering off a display
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a shutdown control circuit, a shutdown control method and a display device, comprising a control module and a voltage output module; the control module comprises a control unit, wherein the control unit is used for starting timing after detecting that the front-end system stops transmitting data, and outputting an effective trigger signal after reaching a preset time so as to enable the control module to output an effective control signal; and the voltage output module is used for outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of the pixel units in the display device when the display device is shut down. The application can effectively prolong the time of releasing the residual charges of the pixel units when the display device is shut down, better eliminate the shutdown residual image phenomenon, and also can effectively adjust the time of releasing the residual charges of the pixel units, thereby improving the quality of products.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a power-off control circuit, a power-off control method, and a display device.
Background
The liquid crystal display device mainly comprises a display panel and a circuit board for providing various signals for the display panel, wherein the display panel comprises a grid driving circuit, a source driving circuit and a pixel array. The pixel array is formed by arranging a plurality of pixel units defined by a plurality of scanning lines and a plurality of data lines in a crossed manner, and generally, the pixel units mainly comprise thin film transistors, storage capacitors and liquid crystal units. The output end of the grid drive circuit is coupled to the scanning lines and is used for turning on or turning off the thin film transistors connected with the corresponding scanning lines. The source electrode driving circuit is connected with the data lines and provides gray scale display voltage for the corresponding pixel units when the thin film transistors are turned on, so that signals are stored in each pixel unit to display images. When the display panel of the liquid crystal display is powered off, the accumulated charges will slowly disappear in the pixel unit, and the charges remained in the pixel unit can make the liquid crystal display device display the picture when the liquid crystal display device is powered on next time, which can seriously cause the polarization of the liquid crystal and further generate the problem of image sticking.
In order to solve the above problem, in the prior art, an XON (Output ALL-ON Control) function is triggered when the liquid crystal display is turned off to turn ON the thin film transistors of ALL the pixel units, so as to forcedly neutralize and release the charges in the pixel units quickly. For example, in a cog (chip On glass) display device, an XON signal is transmitted to a gate driver, and the gate driver controls to output a turn-On signal to simultaneously turn On all thin film transistors in a display panel after receiving the XON signal, so as to eliminate charges in pixel units. For a goa (gate on array) display device, after receiving an XON signal, a level shifter in a gate driver pulls VGL output by output terminals of the gate driver up to VGH (in a normal display, only one output terminal outputs VGH and the remaining output terminals output VGL at a certain scanning time), thereby simultaneously turning on all thin film transistors in the display device and eliminating charges in pixel units.
However, as shown in fig. 1, in the prior art, a logic input voltage VDD of the display device is used as a control signal for turning on the XON function, and when the logic input voltage VDD is smaller than a reference voltage Vref, that is, when the VDD voltage is reduced to the reference voltage, the comparator OP outputs a valid XON signal to trigger the XON function, and the tft is turned on to discharge through residual charges of the capacitance of the VGH network, so that the discharge time is limited by the capacitance of the VGH network. Therefore, the prior art control of XON discharge has certain drawbacks.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power-off control circuit, a power-off control method and a display device, which can effectively prolong the time for releasing residual charges of pixel units when the display device is powered off, so as to better eliminate the power-off residual image phenomenon, and can also effectively adjust the time for releasing residual charges of the pixel units, thereby improving the quality of the product.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a shutdown control circuit, which includes, as one implementation manner, a control module and a voltage output module; wherein the content of the first and second substances,
the control module comprises a control unit, wherein the control unit is used for starting timing after the front-end system is detected to stop transmitting data, and outputting an effective trigger signal after a preset time is reached so that the control module can output an effective control signal;
and the voltage output module is used for outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of the pixel units in the display device when the display device is shut down.
As one embodiment, the control unit is further configured to output an invalid trigger signal when it is detected that the front-end system is transmitting data or when it is detected that the front-end system stops transmitting data and the preset time is not reached, so that the control module outputs an invalid control signal;
the voltage output module is further used for outputting an invalid shutdown control signal according to the invalid control signal, wherein the invalid shutdown control signal is used for controlling the display device to normally display.
As one embodiment, the control module further includes a logic gate unit, configured to output the valid control signal according to an invalid backlight enable signal and the valid trigger signal, and output the invalid control signal under other conditions of the backlight enable signal and the trigger signal, where the invalid backlight enable signal is used to control turning off a backlight source of the display device.
As one embodiment, the logic gate unit includes an inverting subunit and an and gate; wherein the content of the first and second substances,
the input end of the inverting subunit receives the backlight enabling signal, the output end of the inverting subunit is connected with the first input end of the AND gate, the second input end of the AND gate is connected with the output end of the control unit to receive the trigger signal, and the output end of the AND gate is connected with the voltage output module to output the control signal.
As one embodiment, the voltage output module includes a switch element and a voltage dividing unit, a first path end of the switch element is connected to a power supply voltage end of the display device, a second path end of the switch element is connected to the voltage dividing unit, a control end of the switch element is connected to an output end of the control module, and the voltage dividing unit is configured to divide a voltage of the power supply voltage end when the switch element is turned on, so as to obtain the effective shutdown control signal.
In one embodiment, the inactive backlight enable signal is a low level signal, the active trigger signal is a high level signal, and the active control signal is a high level signal.
In one embodiment, the control unit is integrated into the timing controller.
In order to achieve the above object, a second aspect of the embodiments of the present invention provides a shutdown control method, which as an implementation manner includes:
starting timing after detecting that the front-end system stops transmitting data, and outputting an effective trigger signal for outputting an effective control signal after reaching a preset time;
and outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of pixel units in the display device when the display device is shut down.
As one embodiment, the shutdown control method further includes:
when the front-end system is detected to be transmitting data or when the front-end system is detected to stop transmitting data and the preset time is not reached, outputting an invalid trigger signal for outputting an invalid control signal;
and outputting an invalid shutdown control signal according to the invalid control signal, wherein the invalid shutdown control signal is used for controlling a display device to normally display.
In order to achieve the above object, a third aspect of embodiments of the present invention provides a display device, which includes, as one embodiment, the shutdown control circuit described in any one of the above embodiments.
In summary, the present invention provides a shutdown control circuit, a shutdown control method and a display apparatus, the shutdown control circuit includes a control module and a voltage output module, the control module includes a control unit, the control unit is configured to start timing after detecting that a front-end system stops transmitting data, and output an effective trigger signal after reaching a preset time, so that the control module outputs an effective control signal; and the voltage output module is used for outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of the pixel units in the display device when the display device is shut down. The application can effectively prolong the time of releasing the residual charges of the pixel units when the display device is shut down, better eliminate the shutdown residual image phenomenon, and also can effectively adjust the time of releasing the residual charges of the pixel units, thereby improving the quality of products.
Drawings
Fig. 1 is a schematic structural diagram of a shutdown control circuit provided in the prior art.
Fig. 2 is a block diagram of a shutdown control circuit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a voltage output module according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a voltage output module according to another embodiment of the present invention.
Fig. 5 is a block diagram of a shutdown control circuit according to another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a logic gate unit according to another embodiment of the present invention.
Fig. 7 is a schematic diagram of a signal timing sequence according to an embodiment of the invention.
Fig. 8 is a flowchart of a shutdown control method according to an embodiment of the present invention.
Fig. 9 is a flowchart of a shutdown control method according to another embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
It is to be noted that unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The description herein of "first," "second," and the like, does not denote any order, quantity, or importance, but rather the description is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
To ensure the following description of the embodiments of the present disclosure is clear and concise, a detailed description of known functions and known components may be omitted from the present disclosure, and the description will focus on the inventive points of the present disclosure.
First, it should be noted that the XON function means that when the display device is turned off and a voltage signal (a logic input voltage VDD of a general display device) received by an XON pin of the XON function module drops to a certain value, the XON function is turned on to control a thin film transistor in a pixel unit to be turned on, so that the pixel unit starts to release residual charges. In the conventional XON functional module, the residual charges of the capacitor of the VGH network turn on the thin film transistor in the pixel unit to release the residual charges in the pixel unit. The implementation of the XON function is therefore limited by the capacitance value of the VGH network. In this respect, the inventive concept of the present application is to extend the active time of the XON function module by triggering the XON function in advance.
Specifically, after the front-end system does not transmit display data any more, the display device can also display a black picture of dozens of frames, and the logic input Voltage (VDD) of the display device does not drop in the period, namely the voltage of the VGH network also has a stable input (the voltage of the VGH network is obtained by the logic input Voltage (VDD)), so the method realizes the extension and the control of the drain time of the residual charges of the pixel units in the display device by selectively turning on the XON function in advance during the period that the display device displays the black picture of dozens of frames.
In the present application, valid corresponds to invalid, and means that the signal can be used to implement the function of the module receiving the signal, for example, when the backlight enable signal is valid, the backlight is in an illuminated state, when the backlight enable signal is invalid, the backlight is in an off state, and generally, according to signal classification, the backlight enable signal is valid when the backlight enable signal is at a high level and invalid when the backlight enable signal is at a low level. And other logic control signals. Such as the trigger signal described below, the assertion and deassertion of which do not necessarily correspond to the high level and the low level, but may be the low level and the high level. The principles of operation of specific circuits may be literally understood in conjunction with. Since active and inactive are two level types of the same signal, the same identification is used for both active and inactive signals hereinafter.
Next, the present application is described in detail with reference to fig. 2, and fig. 2 is a block diagram of a shutdown control circuit according to an embodiment of the present invention. As shown in fig. 2, the shutdown control circuit 10 includes a control module 11 and a voltage output module 12; the control module 11 includes a control unit 110, where the control unit 110 is configured to start timing after detecting that the front-end system stops transmitting data, and output an effective trigger signal after a preset time is reached, so that the control module 11 outputs an effective control signal; and a voltage output module 12, configured to output an effective shutdown control signal according to the effective control signal, where the effective shutdown control signal is used to control the driving circuit to release the residual charges of the pixel units in the display device when the display device is shutdown.
Specifically, the control unit 110 starts timing after detecting that the front-end system stops transmitting data, and outputs an effective trigger signal after reaching a preset time, so that the control module 11 outputs an effective control signal. Generally, after the front end system no longer sends data, the timing controller enters a FreeRun state and continues to send black pictures of over ten frames. Therefore, the preset time may be any time during which the display device displays a black screen of a dozen frames after the front-end system stops sending the screen, for example, when one frame time is reached after the screen sending is stopped, an effective trigger signal is output. The control unit 110 may be integrated into the timing control or may be provided independently. When the voltage output module is integrated in a time schedule controller, the time schedule controller starts timing after detecting that a system stops sending data, and outputs an effective trigger signal through a general purpose input/output (GPIO) after reaching preset time, wherein the effective trigger signal is not limited to a high level, but also can be a low level, and is not limited in the above, and only the specific structure of the voltage output module can be correspondingly adjusted according to different signal levels.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a voltage output module according to an embodiment of the present invention. As shown in fig. 3, the voltage output module includes a first switch element T1 and a voltage dividing unit (a first resistor R1 and a second resistor R2), a first path end of the first switch element T1 is connected to a voltage terminal V1, which may be a power supply voltage terminal VDD of the display device, or may be a fixed voltage, a second path end of the first switch element T1 is connected to the voltage dividing unit, a control end of the first switch element T1 is connected to the output end of the control module 11 to receive the control signal Ctr, the voltage dividing unit is configured to divide the voltage V1 when the first switch element T1 is turned on, and certainly, the voltage dividing unit is not required, as long as the voltage provided by the voltage terminal V1 is within an input range of the XON function pin. Specifically, when the control signal Ctr is an active control signal (high level), the first switch element T1 is turned off, and the voltage signal XON received by the XON pin is 0V, thereby triggering the XON function. The first switch element T1 is turned on at low level, for example, it may be a PMOS transistor, when the first switch element T1 is a PMOS transistor, the first pass end is a source of the PMOS transistor, the second pass end is a drain of the PMOS transistor, and the control end is a gate of the PMOS transistor.
In one embodiment, the control unit 10 is further configured to output an invalid trigger signal when detecting that the front-end system is transmitting data or when detecting that the front-end system stops transmitting data and does not reach a preset time, so that the control module 10 outputs an invalid control signal Ctr; the voltage output module 20 is further configured to output an invalid shutdown control signal XON according to the invalid control signal Ctr, where the invalid shutdown control signal XON is used to control the display device to normally display.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a voltage output module according to another embodiment of the present invention. As shown in fig. 4, with respect to the voltage output module 12 shown in fig. 3, the voltage output module 12 in this embodiment further includes a second switch element T2, a not gate U1 and a third resistor R3, a first path end of the second switch element T2 is connected to a control end of the first switch element T1, a second path end of the second switch element T2 is grounded, a control end of the second switch element T2 is connected to an output end of the not gate U1, an input end of the not gate U1 is connected to an output end of the control module 11 to receive a control signal Ctr (including valid and invalid), and the third resistor R3 is connected between the control end of the second switch element T2 and the first path end. The second switch element T2 is turned on when the control terminal is at a high level, that is, the high level is active, and may be, for example, an NMOS transistor, where the first pass terminal is a drain of the NMOS transistor, the second pass terminal is a source of the NMOS transistor, and the control terminal is a gate of the NMOS transistor.
It is also possible to prevent instability caused by the floating of the first switch element T1 by connecting a resistor between the first pass terminal and the control terminal of the first switch element T1.
Referring to fig. 5, fig. 5 is a block diagram of a shutdown control circuit according to another embodiment of the present invention. As shown in fig. 5, the control module 11 further includes a logic gate unit 111, where the logic gate unit 111 is configured to output an active control signal according to an inactive backlight enable signal and an active trigger signal, and output an inactive control signal under other conditions of the backlight enable signal and the trigger signal, where the inactive backlight enable signal is used to control turning off the backlight source of the display device.
Specifically, the power-on timing sequence of the backlight enable signal is after the logical input Voltage (VDD) of the display device when the display device is powered on, and the power-off power-down is before the logical input Voltage (VDD) of the display device, and the power-off time point when the display device is powered off is close to the time point when the front-end system stops transmitting the picture, that is, the power-off timing sequence is understood to be close to the starting time point when the display device transmits a dozen or more frames of black pictures, so that the power-off discharge operation (XON function) can be performed on the premise that the backlight source of the display device is turned off in order not to affect the display. That is, by providing the logic gate unit 111, the logic gate unit 111 outputs an active control signal according to the inactive backlight enable signal and the active trigger signal, and outputs an inactive control signal in other cases of the backlight enable signal and the trigger signal.
Specifically, referring to fig. 6, fig. 6 is a schematic structural diagram of a logic gate unit according to another embodiment of the present invention. As shown in fig. 6, the logic gate unit 111 includes an inverting subunit U2 and an and gate U3; the input end of the inverting subunit U2 receives the backlight enable signal, the output end of the inverting subunit U2 is connected to the first input end of the and gate U3, the second input end of the and gate U3 is connected to the output end of the control unit 110 to receive the trigger signal TX, and the output end of the and gate U3 is connected to the voltage output module 12 to output the control signal Ctr.
Specifically, taking the active trigger signal TX as a high level and the active control signal Ctr as a high level as an example, when the system is turned off, the backlight enable signal terminal is the inactive backlight enable signal EN, i.e. a low level signal, and the inverting subunit U2, such as a not gate, outputs a high level signal to the first input terminal of the and gate U3, the control unit 110 starts timing after detecting that the front-end system stops transmitting data, and outputs the active trigger signal TX (high level) to the second input terminal of the and gate U3 after reaching a preset time, and then the output terminal of the and gate U3 outputs the active control signal Ctr (high level).
It should be noted that, as long as the timing is started after the backlight source is turned off (determined by the backlight enable signal EN) and the front-end system stops transmitting data, and the voltage of the XON pin of the XON function module is controlled to reach the corresponding trigger voltage when the preset time is reached, the intermediate circuit in signal control and processing may be changed accordingly according to the different signal types (e.g., high level and low level). Therefore, by the technical scheme of the application, the effect time of the XON function module can be greatly prolonged on the basis of the effect time of the existing XON function module, for example, according to the test of a certain machine, when the XON function is triggered by the power failure of the logic input Voltage (VDD) of the normally used display device, the effect time of the XON function is 81ms (which is determined by the capacitance of the VGH network), and when the technical scheme of the application is used, the effect time of the XON function can maximally reach 404ms (323+ 81). That is, the longest duration is the condition that the preset time is 0, that is, the XON function is started after the front-end system detects that the data transmission is stopped. Referring to fig. 7, fig. 7 is a schematic signal timing diagram according to an embodiment of the invention. As shown in fig. 7, SOURCE represents a data signal, a timing controller between a point a and a point B enters a FreeRun state, and continues to send black picture data of several frames, and this stage is schematically distinguished by the height (size) of the SOURCE signal in fig. 7, and the trigger time point of the XON function can be arbitrarily set between the point a and the point B by a timing function, that is, the starting point can be arbitrarily set within 323ms as in the above example.
In summary, the shutdown control circuit provided in this embodiment can effectively prolong the time for releasing the residual charges of the pixel units when the display device is shutdown, so as to better eliminate the shutdown residual image phenomenon, and can also effectively adjust the time for releasing the residual charges of the pixel units, thereby improving the quality of the product.
Referring to fig. 8, fig. 8 is a flowchart illustrating a shutdown control method according to an embodiment of the present invention. As shown in fig. 8, the shutdown control method includes the steps of:
step S1: and starting timing after detecting that the front-end system stops transmitting data, and outputting an effective trigger signal for outputting an effective control signal after reaching a preset time.
Specifically, when an effective control signal is generated, timing can be started directly after the front-end system stops transmitting data according to detection, an effective trigger signal is output after a preset time is reached, and the effective trigger signal is used as an effective control signal. In other embodiments, an active control signal may also be output according to an inactive backlight enable signal and an active trigger signal. Namely, whether the backlight source is closed or not is used as a precondition for starting the XON functional module.
Step S2: and outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of the pixel units in the display device when the display device is shut down.
Referring to fig. 9, fig. 9 is a flowchart of a shutdown control method according to another embodiment of the present invention. As shown in fig. 9, the shutdown control method of the present application further includes:
step S3: and outputting an invalid trigger signal for outputting an invalid control signal when the front-end system is detected to be transmitting data or when the front-end system is detected to stop transmitting data and the preset time is not reached.
Specifically, when the invalid control signal is generated, the invalid trigger signal is output as the invalid control signal by detecting that the front-end system is transmitting data or when the front-end system stops transmitting data and the preset time is not reached. In other embodiments, the backlight enable signal (whether the backlight source is turned off or not) may be used as a precondition for turning on the XON function module. That is, except for the case where the backlight enable signal is inactive and the trigger signal is active, the control signal is inactive in other cases.
Step S4: and outputting an invalid shutdown control signal according to the invalid control signal, wherein the invalid shutdown control signal is used for controlling the display device to normally display.
It should be noted that other details and principle portions of the shutdown control method of this embodiment may be described with reference to the foregoing embodiment of the shutdown control circuit, and repeated details are not repeated.
In summary, the shutdown control method provided in this embodiment can effectively prolong the time for releasing the residual charges of the pixel units when the display device is shutdown, better eliminate the shutdown residual image phenomenon, and also effectively adjust the time for releasing the residual charges of the pixel units, thereby improving the quality of the product.
In an embodiment, the display device includes the shutdown control circuit of any of the above embodiments.
It should be noted that the drawings of the embodiments of the present application only relate to the structures related to the inventive points of the embodiments of the present application, and other structures may refer to general designs.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. A shutdown control circuit is characterized by comprising a control module and a voltage output module; wherein the content of the first and second substances,
the control module comprises a control unit, wherein the control unit is used for starting timing after the front-end system is detected to stop transmitting data, and outputting an effective trigger signal after a preset time is reached so that the control module can output an effective control signal;
and the voltage output module is used for outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of the pixel units in the display device when the display device is shut down.
2. The shutdown control circuit according to claim 1, wherein the control unit is further configured to output an invalid trigger signal when detecting that the front-end system is transmitting data or when detecting that the front-end system stops transmitting data and does not reach the preset time, so that the control module outputs an invalid control signal;
the voltage output module is further used for outputting an invalid shutdown control signal according to the invalid control signal, wherein the invalid shutdown control signal is used for controlling the display device to normally display.
3. The shutdown control circuit according to claim 2, wherein the control module further comprises a logic gate unit, the logic gate unit is configured to output the valid control signal according to an invalid backlight enable signal and the valid trigger signal, and output the invalid control signal in other situations of the backlight enable signal and the trigger signal, wherein the invalid backlight enable signal is used for controlling to turn off a backlight source of the display device.
4. The shutdown control circuit of claim 3, wherein the logic gate unit comprises an inverting subunit and an AND gate; wherein the content of the first and second substances,
the input end of the inverting subunit receives the backlight enabling signal, the output end of the inverting subunit is connected with the first input end of the AND gate, the second input end of the AND gate is connected with the output end of the control unit to receive the trigger signal, and the output end of the AND gate is connected with the voltage output module to output the control signal.
5. The shutdown control circuit according to claim 1, wherein the voltage output module includes a first switch element and a voltage dividing unit, a first path end of the first switch element is connected to a supply voltage end of the display device, a second path end of the first switch element is connected to the voltage dividing unit, a control end of the switch element is connected to an output end of the control module, and the voltage dividing unit is configured to divide a voltage of the supply voltage end when the switch element is turned on, so as to obtain the effective shutdown control signal.
6. The shutdown control circuit of claim 3, wherein the inactive backlight enable signal is a low level signal, the active trigger signal is a high level signal, and the active control signal is a high level signal.
7. The shutdown control circuit of claim 1, wherein the control unit is integrated into a timing controller.
8. A shutdown control method, comprising:
starting timing after detecting that the front-end system stops transmitting data, and outputting an effective trigger signal for outputting an effective control signal after reaching a preset time;
and outputting an effective shutdown control signal according to the effective control signal, wherein the effective shutdown control signal is used for controlling the driving circuit to release residual charges of pixel units in the display device when the display device is shut down.
9. The shutdown control method according to claim 8, further comprising:
when the front-end system is detected to be transmitting data or when the front-end system is detected to stop transmitting data and the preset time is not reached, outputting an invalid trigger signal for outputting an invalid control signal;
and outputting an invalid shutdown control signal according to the invalid control signal, wherein the invalid shutdown control signal is used for controlling a display device to normally display.
10. A display device comprising the power-off control circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608865.8A CN112735346B (en) | 2020-12-30 | 2020-12-30 | Shutdown control circuit, shutdown control method and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011608865.8A CN112735346B (en) | 2020-12-30 | 2020-12-30 | Shutdown control circuit, shutdown control method and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112735346A true CN112735346A (en) | 2021-04-30 |
| CN112735346B CN112735346B (en) | 2022-03-25 |
Family
ID=75610865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011608865.8A Active CN112735346B (en) | 2020-12-30 | 2020-12-30 | Shutdown control circuit, shutdown control method and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112735346B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113436587A (en) * | 2021-06-22 | 2021-09-24 | 昆山龙腾光电股份有限公司 | Regulating circuit |
| CN114822402A (en) * | 2022-06-30 | 2022-07-29 | 惠科股份有限公司 | Drive circuit, display module and display device |
| WO2023221789A1 (en) * | 2022-05-16 | 2023-11-23 | 京东方科技集团股份有限公司 | Display apparatus, panel drive circuit thereof, and charge discharge method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010020928A1 (en) * | 2000-03-03 | 2001-09-13 | Tetsuya Yanagisawa | LCD display unit |
| CN101777320A (en) * | 2010-01-27 | 2010-07-14 | 友达光电（苏州）有限公司 | Ghost eliminating circuit, display and electronic device |
| CN102023434A (en) * | 2009-09-18 | 2011-04-20 | 北京京东方光电科技有限公司 | Array substrate and driving method thereof |
| CN105702207A (en) * | 2016-04-15 | 2016-06-22 | 京东方科技集团股份有限公司 | Driving method capable of preventing frame ghosting on display panel during shutdown and display apparatus |
| CN107784990A (en) * | 2017-10-31 | 2018-03-09 | 京东方科技集团股份有限公司 | Charging method, electric discharge regulation circuit and the display device of liquid crystal display panel |
| CN108121094A (en) * | 2017-12-12 | 2018-06-05 | 深圳市华星光电技术有限公司 | The shutdown charging method and circuit of a kind of liquid crystal display panel |
| CN109917574A (en) * | 2019-04-26 | 2019-06-21 | 合肥惠科金扬科技有限公司 | A kind of switching on and shutting down ghost eliminating method, system and liquid crystal display |
| CN110661408A (en) * | 2019-09-17 | 2020-01-07 | 昆山龙腾光电股份有限公司 | Discharge circuit, power supply and display device |
| CN209993327U (en) * | 2019-06-11 | 2020-01-24 | 昆山龙腾光电股份有限公司 | Shutdown control circuit and display device thereof |
-
2020
- 2020-12-30 CN CN202011608865.8A patent/CN112735346B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010020928A1 (en) * | 2000-03-03 | 2001-09-13 | Tetsuya Yanagisawa | LCD display unit |
| CN102023434A (en) * | 2009-09-18 | 2011-04-20 | 北京京东方光电科技有限公司 | Array substrate and driving method thereof |
| US20110096051A1 (en) * | 2009-09-18 | 2011-04-28 | Beijing Boe Optoelectronics Technology Co., Ltd. | Array substrate and driving method thereof |
| CN101777320A (en) * | 2010-01-27 | 2010-07-14 | 友达光电（苏州）有限公司 | Ghost eliminating circuit, display and electronic device |
| CN105702207A (en) * | 2016-04-15 | 2016-06-22 | 京东方科技集团股份有限公司 | Driving method capable of preventing frame ghosting on display panel during shutdown and display apparatus |
| US20180197472A1 (en) * | 2016-04-15 | 2018-07-12 | Boe Technology Group Co., Ltd. | Driving method for preventing image sticking of display panel upon shutdown, and display device |
| CN107784990A (en) * | 2017-10-31 | 2018-03-09 | 京东方科技集团股份有限公司 | Charging method, electric discharge regulation circuit and the display device of liquid crystal display panel |
| CN108121094A (en) * | 2017-12-12 | 2018-06-05 | 深圳市华星光电技术有限公司 | The shutdown charging method and circuit of a kind of liquid crystal display panel |
| CN109917574A (en) * | 2019-04-26 | 2019-06-21 | 合肥惠科金扬科技有限公司 | A kind of switching on and shutting down ghost eliminating method, system and liquid crystal display |
| CN209993327U (en) * | 2019-06-11 | 2020-01-24 | 昆山龙腾光电股份有限公司 | Shutdown control circuit and display device thereof |
| CN110661408A (en) * | 2019-09-17 | 2020-01-07 | 昆山龙腾光电股份有限公司 | Discharge circuit, power supply and display device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113436587A (en) * | 2021-06-22 | 2021-09-24 | 昆山龙腾光电股份有限公司 | Regulating circuit |
| WO2023221789A1 (en) * | 2022-05-16 | 2023-11-23 | 京东方科技集团股份有限公司 | Display apparatus, panel drive circuit thereof, and charge discharge method |
| CN114822402A (en) * | 2022-06-30 | 2022-07-29 | 惠科股份有限公司 | Drive circuit, display module and display device |
| CN114822402B (en) * | 2022-06-30 | 2022-09-20 | 惠科股份有限公司 | Drive circuit, display module and display device |
| US11749209B1 (en) | 2022-06-30 | 2023-09-05 | HKC Corporation Limited | Drive circuit, display assembly, and display device |
| WO2024001001A1 (en) * | 2022-06-30 | 2024-01-04 | 惠科股份有限公司 | Driving circuit, display module, and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112735346B (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112735346B (en) | Shutdown control circuit, shutdown control method and display device | |
| US9767758B2 (en) | Driving apparatus of display panel and driving method thereof, display device | |
| US7015904B2 (en) | Power sequence apparatus for device driving circuit and its method | |
| US8711137B2 (en) | Liquid crystal display device with a control mechanism for eliminating images | |
| US7825919B2 (en) | Source voltage removal detection circuit and display device including the same | |
| US8872859B2 (en) | Liquid crystal panel driving method, and source driver and liquid crystal display apparatus using the method | |
| US20060022932A1 (en) | Display panel, drive circuit, display device, and electronic equipment | |
| US8669974B2 (en) | Flat display and timing controller thereof for neutralizing charges in liquid crystal capacitors upon shut down | |
| CN108597472B (en) | Display device and method for eliminating shutdown ghost | |
| US20150179128A1 (en) | Gate driver and display apparatus | |
| CN108962165B (en) | Circuit and method for eliminating power-down residual image of IGZO display panel | |
| US20090231259A1 (en) | Apparatus and method for eliminating image sticking of liquid crystal display | |
| JP2007011334A (en) | Timing controller for display devices, display device including same, and method of controlling same | |
| CN108231022B (en) | Driving circuit and driving method of liquid crystal display device and liquid crystal display device | |
| CN101191927A (en) | Liquid crystal display device and method of driving liquid crystal display device | |
| US20090231253A1 (en) | Lcd with the function of eliminating the power-off residual images | |
| US20140118330A1 (en) | Display device and method for driving the same | |
| CN108172179B (en) | Power management circuit | |
| CN107516502B (en) | Liquid crystal display panel driving circuit and driving method | |
| CN101540149A (en) | Device for eliminating shutdown shadow and method thereof | |
| US8913048B2 (en) | Source driver circuit of liquid crystal display device | |
| CN112967692B (en) | Ghost eliminating circuit and display device | |
| US7336269B2 (en) | Electronic discharging control circuit and method thereof for LCD | |
| CN112992097B (en) | Driving method, driving circuit and display device | |
| CN114724525B (en) | Display device, panel driving circuit thereof and charge discharging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |