CN109917574B - Method and system for eliminating residual shadow during startup and shutdown and liquid crystal display device - Google Patents
Method and system for eliminating residual shadow during startup and shutdown and liquid crystal display device Download PDFInfo
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Abstract
The method and the system for eliminating the startup and shutdown residual image and the liquid crystal display device are applicable to the technical field of liquid crystal display, the first preset image signal is generated before the effective data of the low-voltage differential signal of the liquid crystal display device is enabled, so that when the effective data of the low-voltage differential signal is enabled, the first preset image signal drives the display panel to display the first preset image, and the startup residual image can be effectively eliminated; before the backlight module is closed, a second preset picture signal is generated, the external signal source is switched to the second preset picture signal, when the backlight module is closed, the display panel is driven to display a second preset picture through the second preset picture signal, shutdown ghost shadows can be effectively eliminated, and therefore the display effect of the liquid crystal display device during startup or shutdown is effectively improved.
Description
Technical Field
The application belongs to the technical field of liquid crystal display, and particularly relates to a startup and shutdown ghost shadow eliminating method and system and liquid crystal display equipment.
Background
With the continuous development of liquid crystal display technology, various liquid crystal display devices such as mobile phones, tablet computers, notebook computers, televisions, displays, electronic billboards and the like are developed, which brings great convenience to daily production and life of people.
However, in the conventional liquid crystal display device, after the Low Voltage Differential Signaling (LVDS) valid data is enabled, the backlight module can be turned on only 1000ms, and in the 1000ms, if the picture generated by the Low Voltage Differential signal is a moving picture with higher brightness, a picture ghost is easily generated on the screen before the backlight module is turned on; when the backlight module is closed, the low-voltage differential signal continues to output the picture, and the picture ghost is easily generated on the screen, so that the display effect is reduced.
Disclosure of Invention
In view of this, the present disclosure provides a method and a system for eliminating image sticking when a liquid crystal display device is turned on or off, and a liquid crystal display device, so as to solve the problem that the conventional liquid crystal display device is easy to generate image sticking on a screen when the liquid crystal display device is turned on or turned off, thereby reducing a display effect.
A first aspect of an embodiment of the present application provides a method for eliminating a residual image during power on and power off, which is applied to a liquid crystal display device, and the method includes:
generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled, so that when the effective data of the low-voltage differential signal is enabled, the display panel is driven by the first preset picture signal to display a first preset picture;
in a second preset time period before the backlight module is started, closing the first preset picture, and switching the first preset picture signal into an external signal source so as to drive the display panel to display through the external signal source when the backlight module is started;
generating a second preset picture signal in a third preset time period before the backlight module is closed, and switching the external signal source into the second preset picture signal so as to drive the display panel to display a second preset picture through the second preset picture signal when the backlight module is closed;
and stopping generating the second preset picture signal and closing the second preset picture within a fourth preset time period after the low-voltage differential signal effective data is forbidden.
A second aspect of the embodiments of the present application provides a system for eliminating afterimage during power on/off, which is applied to a liquid crystal display device, and the system includes:
the first picture generation module is used for generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal are enabled so as to drive the display panel to display a first preset picture through the first preset picture signal when the effective data of the low-voltage differential signal are enabled;
the first picture closing module is used for closing the first preset picture within a second preset time period before the backlight module is started, switching the first preset picture signal into an external signal source, and driving the display panel to display through the external signal source when the backlight module is started;
the second image generation module is used for generating a second preset image signal in a third preset time period before the backlight module is closed, switching the external signal source into the second preset image signal and driving the display panel to display a second preset image through the second preset image signal when the backlight module is closed;
and the second picture closing module is used for stopping generating the second preset picture signal and closing the second preset picture within a fourth preset time period after the low-voltage differential signal effective data is forbidden.
A third aspect of the embodiments of the present application provides a liquid crystal display device, including a memory, a driver board, and a computer program stored in the memory and capable of running on the driver board, where the driver board implements the steps of the method for removing the afterimage when executing the computer program.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a driver board, the steps of the method for removing the afterimage when the driver board is turned on and off are implemented.
According to the embodiment of the application, the first preset picture signal is generated before the effective data of the low-voltage differential signal of the liquid crystal display device is enabled, so that when the effective data of the low-voltage differential signal is enabled, the display panel is driven by the first preset picture signal to display the first preset picture, and the startup ghost can be effectively eliminated; before the backlight module is closed, a second preset picture signal is generated, the external signal source is switched to the second preset picture signal, when the backlight module is closed, the display panel is driven to display a second preset picture through the second preset picture signal, shutdown ghost shadows can be effectively eliminated, and therefore the display effect of the liquid crystal display device during startup or shutdown is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of power on and off timings of a liquid crystal display device according to an embodiment of the present application;
FIG. 2 is a definition of power on and off timings of a liquid crystal display device according to an embodiment of the present application;
fig. 3 is a schematic flowchart illustrating a method for removing a residual image after power-on and power-off according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a system for eliminating residual image after power-on and power-off according to a second embodiment of the present application;
fig. 5 is a schematic structural diagram of a liquid crystal display device according to a third embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 protection scope of the present application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
Example one
As shown in fig. 1 and 2, power on and off timings of the liquid crystal display device are exemplarily shown; wherein, the time period TI-T6 is defined as follows:
t1(0.5ms to 10ms, VDD rising time from 10% to 90%) is a signal transition time, which is also referred to as transition time, and is a time required for the voltage of the display Panel (PANAL) of the liquid crystal display device to rise from 10% VDD to 90% VDD after the power supply (power supply of the power supply board) of the liquid crystal display device is turned on;
t2(20ms to 50ms, The time from VDD to valid data at power ON) is The time from 100% VDD to The enabling of The effective data of The low voltage differential signal ON The display panel when The power is ON;
t3(100 ms-500 ms, The time from valid data Off to VDD Off at power Off) is The time when The power is Off, The low voltage differential signal valid data is disabled until The Voltage (VDD) starts to turn Off;
t4(1000ms, VDD off time for Windows restart) refers to the time to restart the window (Windows) of the display panel after the voltage is completely turned off (i.e., after the voltage drops to 10% VDD);
t5(1000ms, The time from valid data to B/L enable at power ON) refers to The time from The enabling of The effective data (LVDS VALID DATA) of The low voltage differential signal to The starting of The backlight module when The power is ON;
t6(100ms, The time from valid data Off to B/L disable at power Off) is The time from The disabling of The effective data of The low voltage differential signal to The turning Off of The backlight module when The power is turned Off.
The embodiment provides a method for eliminating ghost image after power on and off, which is applied to a liquid crystal display device, and may be specifically executed by a drive board (motherboard) of the liquid crystal display device, where the drive board includes a TMDS (Transition-modulated differential signaling) receiver, an a/D converter, a clock generator, a display processing chip (Scaler chip), a Microcontroller circuit, a low-voltage differential signal transmitter, and the like, and the Microcontroller circuit includes an MCU (Microcontroller Unit), a memory, and the like. The memory is stored with a computer program, and the driving board realizes the method for eliminating the residual image when the driving board executes the computer program.
As shown in fig. 3, the method for removing the afterimage after power on/off provided in this embodiment includes:
step S301, in a first preset time period before the low voltage differential signal valid data is enabled, a first preset picture signal is generated, so that when the low voltage differential signal valid data is enabled, the display panel is driven by the first preset picture signal to display a first preset picture.
In a specific application, since the time from enabling the valid data of the low voltage differential signal (the low voltage differential signal VALID DATA) to turning on the backlight module is as long as 1000ms after the liquid crystal display device is turned on, in order to eliminate the image sticking of the display panel within the 1000ms, it is necessary to generate the first predetermined image signal before the time T5, i.e., the time T2, so as to drive the display panel to display the first predetermined image within the time T5. The first preset time period may be T2 time, or any time period within T2 time.
In a specific application, the first preset picture signal may be a signal for displaying any low-brightness picture, for example, the first preset picture signal may be a black picture signal, and correspondingly, the first preset picture is a black picture.
In one embodiment, the first predetermined picture signal is a signal for displaying a picture with a brightness lower than a predetermined brightness, and correspondingly, the first predetermined picture is a picture with a brightness lower than the predetermined brightness.
In a specific application, the display processing chip may actively generate the first preset picture signal, or the MCU may control the display processing chip to generate the first preset picture signal.
In one embodiment, step S301 comprises:
calling a picture color adjusting function to generate a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled;
and calling a picture enabling starting function when the effective data of the low-voltage differential signal is enabled, and driving the display panel to display a first preset picture through the first preset picture signal.
In a specific application, the color adjustment function is expressed as scalerddomainainegenadjust color (x, y, z); the picture ENABLE on function is denoted as scalerddomainaineenabled (_ ENABLE); the (x, y, z) parameter in the color adjustment function represents the values of R (red), G (green), and B (blue), and the range of R, G, B values is 0-255, wherein when R, G, B values are all 0, the first predetermined picture signal is a black picture signal, the first predetermined picture signal is a black picture, and when R, G, B values are all 255, the first predetermined picture signal is a white picture signal, and the first predetermined picture is a white picture.
Step S302, in a second preset time period before the backlight module is turned on, the first preset picture is turned off, and the first preset picture signal is switched to an external signal source, so that the display panel is driven by the external signal source to display when the backlight module is turned on.
In a specific application, when the backlight module is to be turned on after the time T5 is over, the first preset image needs to be turned off, the first preset image is switched to an external signal source connected to the TMDS receiver or the a/D converter, and then the display panel is driven by the external signal source to display when the backlight module is turned on. The second preset time period may be T5 time, or any time period near the end time of T5 within the time of T5.
In a specific application, the display processing chip may actively switch the first preset picture signal to the external signal source, or the MCU controls the display processing chip to switch the first preset picture signal to the external signal source.
In one embodiment, step S302 includes:
calling a picture enabling and closing function in a second preset time period before the backlight module is started, and switching a first preset picture signal into an external signal source;
and calling a backlight power supply starting control function to drive the backlight power supply to be started so as to drive the display panel to display through an external signal source when the backlight module is started.
In a specific application, the picture enable close function is expressed as scalerddomainainegenenable (_ DISABLE); the BACKLIGHT POWER-ON CONTROL function is denoted as PCB _ BACKLIGHT _ POWER (_ LIGHT _ CONTROL _ ON).
Step S303, generating a second preset picture signal in a third preset time period before the backlight module is turned off, and switching the external signal source to the second preset picture signal, so that the display panel is driven by the second preset picture signal to display a second preset picture when the backlight module is turned off.
In a specific application, after the liquid crystal display device is turned off, the time from the backlight module being turned off to the low voltage differential signal valid data being disabled is as long as 100ms, and in order to eliminate the image sticking of the display panel within the 100ms, it is necessary to generate the second preset image signal before the time T6, so as to drive the display panel to display the second preset image within the time T6. The third preset time period may be from the end time of T5 to the start time of T6, or may be any time period between the end time of T5 and the start time of T6.
In a specific application, the second preset picture signal may be a signal for displaying any low-brightness picture, for example, the second preset picture signal may be a black picture signal, and correspondingly, the second preset picture is a black picture. The first preset picture signal and the second preset signal may be the same or different, and correspondingly, the first preset picture and the second preset signal may be the same or different.
In one embodiment, the second predetermined picture signal is a signal for displaying a picture with a brightness lower than the predetermined brightness, and correspondingly, the second predetermined picture is a picture with a brightness lower than the predetermined brightness.
In a specific application, the display processing chip may actively generate the second preset picture signal, or the MCU may control the display processing chip to generate the second preset picture signal.
In a specific application, the display processing chip may actively switch the external signal source to the second preset picture signal, or the MCU controls the display processing chip to switch the external signal source to the second preset picture signal.
In one embodiment, step S303 includes:
calling a picture color adjusting function to generate a second preset picture signal in a third preset time period before the backlight module is closed, and switching an external signal source into the second preset picture signal;
calling a backlight power supply closing control function to drive the backlight power supply to be closed;
and when the backlight module is closed, calling the picture enabling starting function, and driving the display panel to display a second preset picture through a second preset picture signal.
In a specific application, the BACKLIGHT POWER-OFF CONTROL function is denoted as PCB _ BACKLIGHT _ POWER (_ LIGHT _ CONTROL _ OFF).
Step S304, in a fourth preset time period after the low voltage differential signal valid data is disabled, generating a second preset picture signal is stopped, and the second preset picture is closed.
In a specific application, at the end of time T6, i.e., at the beginning of time T3, the low voltage differential signal valid data is disabled, and then the generation of the second preset picture signal is stopped.
In a specific application, the display processing chip may actively stop generating the second preset picture signal, or the MCU controls the display processing chip to stop generating the second preset picture signal.
In one embodiment, step S304 includes:
within a fourth preset time period after the low-voltage differential signal valid data is forbidden, terminating the execution of the picture color adjusting function and stopping generating a second preset picture signal;
and calling a picture enabling closing function and closing the second preset picture.
In one embodiment, before step S301, the method includes:
judging whether a picture corresponding to the effective data of the low-voltage differential signal is a moving picture with the brightness larger than or equal to the preset brightness; if yes, executing step S301; if not, the display panel is driven to display through an external signal source.
In a specific application, when the picture corresponding to the effective data of the low voltage differential signal is a moving picture with high brightness, a picture ghost is easily generated when the liquid crystal display device is turned on or turned off, so that whether the picture corresponding to the effective data of the low voltage differential signal is a picture with high brightness or not can be detected in advance, if so, the step S301 is executed, otherwise, the picture corresponding to the external signal source is directly displayed.
In specific application, the preset brightness can be set according to actual needs, the brightness of a picture can be detected by detecting the voltage and duty ratio of effective data of a low-voltage differential signal, the voltage and duty ratio of the effective data of the low-voltage differential signal are in direct proportion to the brightness of the picture, whether the picture is a moving picture can be detected by detecting the number of frames of an external signal source, and the number of frames is in direct proportion to the moving speed of the picture.
In the embodiment, the first preset picture signal is generated before the effective data of the low-voltage differential signal of the liquid crystal display device is enabled, so that when the effective data of the low-voltage differential signal is enabled, the display panel is driven by the first preset picture signal to display the first preset picture, and the startup ghost can be effectively eliminated; before the backlight module is closed, a second preset picture signal is generated, the external signal source is switched to the second preset picture signal, when the backlight module is closed, the display panel is driven to display a second preset picture through the second preset picture signal, shutdown ghost shadows can be effectively eliminated, and therefore the display effect of the liquid crystal display device during startup or shutdown is effectively improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Example two
The embodiment provides a system for removing a residual image of a switch on/off device, which is applied to a liquid crystal display device and used for executing the method steps in the first embodiment.
As shown in fig. 4, the system 4 for removing the afterimage after power on/off provided in this embodiment includes:
a first image generation module 401, configured to generate a first preset image signal within a first preset time period before the low voltage differential signal valid data is enabled, so that when the low voltage differential signal valid data is enabled, the display panel is driven by the first preset image signal to display a first preset image;
a first frame closing module 402, configured to close the first preset frame within a second preset time period before the backlight module is turned on, and switch the first preset frame signal to an external signal source, so as to drive the display panel to display through the external signal source when the backlight module is turned on;
a second image generating module 403, configured to generate a second preset image signal within a third preset time period before the backlight module is turned off, switch the external signal source into the second preset image signal, and drive the display panel to display a second preset image through the second preset image signal when the backlight module is turned off;
the second image closing module 404 is configured to stop generating the second preset image signal and close the second preset image within a fourth preset time period after the low voltage differential signal valid data is disabled.
In one embodiment, the system for removing the afterimage after power on/off further comprises:
the judging module is used for judging whether the picture corresponding to the effective data of the low-voltage differential signal is a moving picture with the brightness larger than the preset brightness; if yes, executing the operation of generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled; if not, the display panel is driven to display through an external signal source.
In the embodiment, the first preset picture signal is generated before the effective data of the low-voltage differential signal of the liquid crystal display device is enabled, so that when the effective data of the low-voltage differential signal is enabled, the display panel is driven by the first preset picture signal to display the first preset picture, and the startup ghost can be effectively eliminated; before the backlight module is closed, a second preset picture signal is generated, the external signal source is switched to the second preset picture signal, when the backlight module is closed, the display panel is driven to display a second preset picture through the second preset picture signal, shutdown ghost shadows can be effectively eliminated, and therefore the display effect of the liquid crystal display device during startup or shutdown is effectively improved.
EXAMPLE III
As shown in fig. 5, the present embodiment provides a liquid crystal display device 5 including: a driver board 50, a memory 51 and a computer program 52 stored in said memory 51 and operable on said driver board 50, such as a power-on and power-off ghost elimination program. When the driving board 50 executes the computer program 52, the steps in the above-mentioned embodiments of the method for removing the on/off afterimage, such as steps S301 to S304 shown in fig. 3, are implemented. Alternatively, the functions of the modules in the above-described device embodiments, for example, the functions of the modules 401 to 404 shown in fig. 4, are implemented when the driver board 50 executes the computer program 52.
Illustratively, the computer program 52 may be partitioned into one or more modules that are stored in the memory 51 and executed by the driver board 50 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 52 in the liquid crystal display device 5. For example, the computer program 52 may be divided into a first screen generating module, a first screen closing module, a second screen generating module and a second screen closing module, and each module has the following specific functions:
the first picture generation module is used for generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal are enabled so as to drive the display panel to display a first preset picture through the first preset picture signal when the effective data of the low-voltage differential signal are enabled;
the first picture closing module is used for closing the first preset picture within a second preset time period before the backlight module is started, switching the first preset picture signal into an external signal source, and driving the display panel to display through the external signal source when the backlight module is started;
the second image generation module is used for generating a second preset image signal in a third preset time period before the backlight module is closed, switching the external signal source into the second preset image signal and driving the display panel to display a second preset image through the second preset image signal when the backlight module is closed;
and the second picture closing module is used for stopping generating the second preset picture signal and closing the second preset picture within a fourth preset time period after the low-voltage differential signal effective data is forbidden.
The liquid crystal display device 5 may be a television, a desktop computer, a notebook, a palm computer, a multimedia advertisement machine, and the like. The liquid crystal display device may include, but is not limited to, a driving board 50, a memory 51. Those skilled in the art will appreciate that fig. 5 is merely an example of the liquid crystal display device 5, and does not constitute a limitation on the liquid crystal display device 5, and may include more or less components than those shown, or combine some components, or different components, for example, the liquid crystal display device may further include an input-output device, a network access device, a bus, etc.
The memory 51 may be an internal storage unit of the liquid crystal display device 5, such as a hard disk or a memory of the liquid crystal display device 5. The memory 51 may also be an external storage device of the liquid crystal display device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the liquid crystal display device 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the liquid crystal display device 5. The memory 51 is used to store the computer program and other programs and data required by the liquid crystal display device. The memory 51 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated module, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method of the embodiments described above can be realized by a computer program, which can be stored in a computer readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a driver board. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A method for eliminating residual shadow during startup and shutdown is characterized by being applied to a liquid crystal display device and comprising the following steps:
judging whether a picture corresponding to the effective data of the low-voltage differential signal is a moving picture with the brightness larger than the preset brightness; if yes, executing the operation of generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled; if not, driving the display panel to display through an external signal source;
generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled, so that when the effective data of the low-voltage differential signal is enabled, a display panel is driven by the first preset picture signal to display a first preset picture, wherein the first preset picture is a picture with the brightness lower than the preset brightness;
in a second preset time period before the backlight module is started, closing the first preset picture, and switching the first preset picture signal into an external signal source so as to drive the display panel to display through the external signal source when the backlight module is started;
generating a second preset picture signal in a third preset time period before the backlight module is closed, and switching an external signal source into the second preset picture signal so as to drive the display panel to display a second preset picture through the second preset picture signal when the backlight module is closed, wherein the second preset picture is a picture with the brightness lower than the preset brightness;
and stopping generating the second preset picture signal and closing the second preset picture within a fourth preset time period after the low-voltage differential signal effective data is forbidden.
2. The method as claimed in claim 1, wherein the generating a first predetermined frame signal within a first predetermined time period before the enabling of the effective data of the low voltage differential signal, so that the display panel is driven by the first predetermined frame signal to display a first predetermined frame when the enabling of the effective data of the low voltage differential signal comprises:
calling a picture color adjusting function to generate a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled;
and calling a picture enabling starting function when the effective data of the low-voltage differential signal is enabled, and driving the display panel to display a first preset picture through the first preset picture signal.
3. The method as claimed in claim 1, wherein the turning off of the first predetermined frame and the switching of the first predetermined frame signal to the external signal source are performed within a second predetermined time period before the backlight module is turned on, so that the display panel is driven by the external signal source to display when the backlight module is turned on, the method comprising:
calling a picture enabling and closing function in a second preset time period before the backlight module is started, and switching a first preset picture signal into an external signal source;
and calling a backlight power supply starting control function to drive the backlight power supply to be started so as to drive the display panel to display through an external signal source when the backlight module is started.
4. The method as claimed in claim 1, wherein the step of generating a second predetermined image signal within a third predetermined time period before the backlight module is turned off, and switching the external signal source to the second predetermined image signal, so that the display panel is driven by the first predetermined image signal to display a second predetermined image when the backlight module is turned off, comprises:
calling a picture color adjusting function to generate a second preset picture signal in a third preset time period before the backlight module is closed, and switching an external signal source into the second preset picture signal;
calling a backlight power supply closing control function to drive the backlight power supply to be closed;
and when the backlight module is closed, calling the picture enabling starting function, and driving the display panel to display a second preset picture through a second preset picture signal.
5. The method as claimed in claim 1, wherein the step of stopping generating the second preset picture signal and turning off the second preset picture within a fourth preset time period after the low voltage differential signal valid data is disabled comprises:
within a fourth preset time period after the low-voltage differential signal valid data is forbidden, terminating the execution of the picture color adjusting function and stopping generating a second preset picture signal;
and calling a picture enabling closing function and closing the second preset picture.
6. The method for eliminating on-off afterimage according to any one of claims 1-5, wherein the first predetermined image signal and the second predetermined image signal are generated by a display processing chip of the LCD device.
7. A system for eliminating residual shadow during startup and shutdown is characterized by being applied to a liquid crystal display device and comprising: the judging module is used for judging whether the picture corresponding to the effective data of the low-voltage differential signal is a moving picture with the brightness larger than the preset brightness; if yes, executing the operation of generating a first preset picture signal in a first preset time period before the effective data of the low-voltage differential signal is enabled; if not, driving the display panel to display through an external signal source;
the display device comprises a first image generation module, a second image generation module and a display module, wherein the first image generation module is used for generating a first preset image signal in a first preset time period before the effective data of the low-voltage differential signal is enabled so as to drive the display panel to display a first preset image through the first preset image signal when the effective data of the low-voltage differential signal is enabled, and the first preset image is an image with the brightness lower than the preset brightness;
the first picture closing module is used for closing the first preset picture within a second preset time period before the backlight module is started, switching the first preset picture signal into an external signal source, and driving the display panel to display through the external signal source when the backlight module is started;
the second image generation module is used for generating a second preset image signal in a third preset time period before the backlight module is closed, and switching the external signal source into the second preset image signal so as to drive the display panel to display a second preset image through the second preset image signal when the backlight module is closed, wherein the second preset image is an image with the brightness lower than the preset brightness;
and the second picture closing module is used for stopping generating the second preset picture signal and closing the second preset picture within a fourth preset time period after the low-voltage differential signal effective data is forbidden.
8. A liquid crystal display device comprising a memory, a driver board, and a computer program stored in said memory and executable on said driver board, wherein said driver board implements the steps of the method for removing afterimage on power-on and power-off as claimed in any one of claims 1 to 6 when executing said computer program.
9. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a driver board, implements the steps of the method for removing afterimage when the driver board turns on or off as claimed in any one of claims 1 to 6.
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