CN116403543B - Driving method and driving device of display panel, display device and storage medium - Google Patents
Driving method and driving device of display panel, display device and storage medium Download PDFInfo
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- CN116403543B CN116403543B CN202310662416.9A CN202310662416A CN116403543B CN 116403543 B CN116403543 B CN 116403543B CN 202310662416 A CN202310662416 A CN 202310662416A CN 116403543 B CN116403543 B CN 116403543B
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Classifications
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- 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
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- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The application belongs to the technical field of display, and provides a driving method and a driving device of a display panel, display equipment and a storage medium, wherein the method comprises the following steps: when the display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel; at the end time of the nth frame of picture, if the running time reaches the preset period time, acquiring second switching electricity based on the first switching voltage; and generating a switching voltage adjusting signal according to the second switching voltage and sending the switching voltage adjusting signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the grid electrode of the thin film transistor, and simultaneously outputs a target polarity control signal to the source electrode of the thin film transistor to drive the display panel to display the n+1st frame and the n+2nd frame of pictures. The application adjusts the switching voltage of the thin film transistor of the display panel at the moment of controlling the polarity control signal of the display panel to overturn, thereby reducing the phenomenon of picture difference at the moment of overturning the polarity control signal.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method and device for a display panel, a display device, and a storage medium.
Background
In the prior art, when the liquid crystal display operates under a specific picture, the phenomenon of residual shadow occurs, and the reason for the phenomenon of residual shadow occurs is that the high-flash signal only provides the maximum liquid crystal voltage and the minimum liquid crystal voltage, so that the liquid crystal is regularly switched at high speed under two extreme states, the original characteristics of the liquid crystal are destroyed after the time is too long, the liquid crystal is turned over and deviated under the middle voltage state, so that the signal residual is formed, and the picture appears as a flickering residual shadow.
The conventional solution to the ghost phenomenon is to set a preset period time (usually set to 28 seconds), and control the POL signal (polarity inversion signal for source driver, polarity control signal) to turn over every 28 seconds, so that the POL signal is not always in a uniform inversion state, and thus the original balance can be effectively broken, and the polarization state is destroyed.
The above-described manner of controlling the inversion of the POL signal every 28 seconds proves to be truly effective, but there are also problems: at the moment of controlling the POL signal to turn over, the data voltage of the display panel can be asymmetric, and the brightness can be different due to the difference of the positive and negative deflection angles of the liquid crystal. From a macroscopic view, when presenting some low gray-scale pictures with particularly sensitive brightness, the display panel may appear to slightly "flash down", which results in poor user experience.
Disclosure of Invention
In view of the above, the embodiments of the present application provide a driving method, a driving device, a display device and a storage medium for a display panel, so as to solve the technical problem of the phenomenon of picture difference occurring at the moment of controlling the polarity control signal of the display panel to be inverted.
In a first aspect, the present application provides a driving method of a display panel, comprising:
when a display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel, wherein the first switching voltage is output to a grid electrode of the thin film transistor by a power management integrated circuit, and n is a positive integer;
acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring a second switching voltage based on the first switching voltage if the running time reaches a preset period time, wherein the preset period time is used for triggering the turning of an original polarity control signal;
generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the grid electrode of the thin film transistor;
and outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over.
In one example of the first aspect, the obtaining, when the display panel displays the nth frame of picture, the first switching voltage of each thin film transistor in the display panel includes:
when a display panel displays an nth frame of picture, acquiring a first turn-off voltage of each thin film transistor in the display panel;
and if the running time reaches a preset period time, acquiring a second switching voltage based on the first switching voltage, including:
if the running time reaches the preset period time, acquiring the leakage voltage increment of the thin film transistor based on the first turn-off voltage;
the generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the gate of the thin film transistor, including:
and generating and sending a turn-off voltage adjustment signal to the power management integrated circuit according to the leakage voltage increment, so that the power management integrated circuit outputs a second turn-off voltage to the grid electrode of the thin film transistor, wherein the second turn-off voltage is generated based on the first turn-off voltage and the leakage voltage increment.
In one example of the first aspect, after the step of outputting the target polarity control signal to the source of the thin film transistor to drive the display panel to display the n+1st frame and the n+2nd frame, the driving method further includes:
and at the end time of the n+2 frame picture, sending an off voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first off voltage to the grid electrode of the thin film transistor.
In one example of the first aspect, the obtaining, when the display panel displays the nth frame of picture, the first switching voltage of each thin film transistor in the display panel includes:
when a display panel displays an nth frame of picture, acquiring a first starting voltage of each thin film transistor in the display panel;
and if the running time reaches a preset period time, acquiring a second switching voltage based on the first switching voltage, including:
if the running time reaches the preset period time, acquiring a charging voltage increment of the thin film transistor based on the first starting voltage;
the generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the gate of the thin film transistor, including:
And generating a switching voltage adjustment signal according to the charging voltage increment and sending the switching voltage adjustment signal to the power management integrated circuit so that the power management integrated circuit outputs a second starting voltage to the grid electrode of the thin film transistor, wherein the second starting voltage is generated based on the first starting voltage and the charging voltage increment.
In one example of the first aspect, after the step of outputting a target polarity control signal to the source of the thin film transistor to drive the display panel to display an n+1st frame and an n+2nd frame, the method further includes:
and at the end time of the n+2 frame picture, sending an on voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first on voltage to the grid electrode of the thin film transistor.
In one example of the first aspect, the acquiring, if the running time reaches a preset cycle time, a second switching voltage based on the first switching voltage includes:
and if the running time reaches the preset period time, searching a corresponding second switching voltage from a preset data table according to the first switching voltage.
In one example of the first aspect, if the running time reaches a preset cycle time, the step of searching for a corresponding second switching voltage from a preset data table according to the first switching voltage includes:
if the running time reaches the preset period time, determining the panel type of the display panel;
determining a preset data table corresponding to the panel type;
and searching a corresponding second switching voltage from the preset data table according to the first switching voltage.
The first aspect of the invention has the beneficial effects that: when a display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel; at the end time of the nth frame of picture, if the running time reaches the preset period time, acquiring second switching electricity based on the first switching voltage; and generating a switching voltage adjusting signal according to the second switching voltage and sending the switching voltage adjusting signal to a power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the grid electrode of the thin film transistor, and simultaneously outputs a target polarity control signal to the source electrode of the thin film transistor to drive the display panel to display an n+1st frame and an n+2nd frame of pictures. The invention adjusts the switching voltage of the thin film transistor of the display panel at the moment of controlling the polarity control signal of the display panel to overturn, thereby reducing the phenomenon of picture difference at the moment of overturning the polarity control signal.
A second aspect of an embodiment of the present application provides a driving apparatus of a display panel, including:
the switching voltage acquisition module is used for acquiring a first switching voltage of each thin film transistor in the display panel when the display panel displays an nth frame of picture, and the first switching voltage is output to the grid electrode of the thin film transistor by the power management integrated circuit, wherein n is a positive integer;
the calling module is used for acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring a second switching voltage based on the first switching voltage if the running time reaches a preset period time, wherein the preset period time is used for triggering the turning of an original polarity control signal;
the output module is used for generating a switch voltage adjustment signal according to the second switch voltage and sending the switch voltage adjustment signal to the power management integrated circuit so that the power management integrated circuit outputs the second switch voltage to the grid electrode of the thin film transistor;
the driving module is used for outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over.
A third aspect of an embodiment of the present application provides a display device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method as claimed in any one of the preceding claims when the computer program is executed.
A fourth aspect of the embodiments of the present application provides a storage medium that is a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the driving method as described above.
In the driving method of the display panel according to the first aspect of the embodiment of the present application, it is understood that the beneficial effects of the second aspect to the fourth aspect can be seen from the related description in the first aspect, and are not repeated herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;
fig. 2 is a timing chart showing a change in voltage polarity of liquid crystal molecules of a display panel provided in an embodiment of the present application;
FIG. 3 is a schematic diagram showing that the source voltages of the liquid crystal molecules of the display panel provided by the application are asymmetric in polarity;
fig. 4 is a flowchart illustrating a driving method of a display panel according to a second embodiment of the application;
fig. 5 is a schematic view of another structure of a display device according to an embodiment of the present application;
fig. 6 is a flowchart illustrating a driving method of another display panel according to the third embodiment of the present application;
fig. 7 is a flowchart of a driving method of a display panel according to a fourth embodiment of the application;
fig. 8 is a block diagram of a driving apparatus for a display panel according to a fifth embodiment of the present application;
reference numerals:
01-processor, 02-memory, 03-computer program, 100-display device, 200-drive means of the display panel, 21-acquisition module, 22-call module, 23-output module and 24-drive module.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Example 1
An embodiment of the present application provides a display device, and fig. 1 shows a schematic structural diagram of a display device 100 of this embodiment, where the display device 100 includes a processor 01, a memory 02, and a computer program 03 stored in the memory 02 and capable of running on the processor 01, and the processor 01 may be a DIC (digital in-line ceramic package, driver circuit integrated chip) or a TCON (timing controller ). The driving method of the display device may be performed by the processor 01 of the display device when running a corresponding computer program.
In applications, the display device may be a thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD), liquid crystal display (Liquid Crystal Display, LCD), organic electro-mechanical laser display (Organic Electroluminesence Display, OLED), quantum dot light emitting diode (Quantum Dot Light Emitting Diodes, QLED) display.
In applications, display devices typically include a high definition multimedia interface (High Definition Multimedia Interface, HDMI), a substrate, a motherboard, a timing control board, a display panel, a source driver, a gate driver, a backlight assembly, and the like. The substrate includes a power management integrated circuit (power management integrated circuit, PMIC) for supplying an operating voltage to a main board, a timing control board, a data driving board, a scan driving board, etc., and for generating a common voltage. The motherboard comprises a Transition-minimized differential signaling (TMDS) receiver, an analog-to-digital converter, a clock generator, a master control chip (Scaler IC), a microcontroller circuit, an embedded display interface and the like. The microcontroller circuit typically includes a backlight control chip, a display data memory, and the like. The timing control board includes timing controller (TCON, timing Controller), data clock recovery (Clock and Data Recovery, CDR) circuits, and the like. The Source Driver includes a data driving unit, which may be a Source Driver Chip (Source Driver IC) or a thin Film Source Driver Chip (S-COF), etc. The Gate Driver includes a Gate driving unit, which may be a Gate driving Chip (Gate Driver IC) or a thin Film Gate driving Chip (G-COF), or the like.
It will be appreciated that the normal POL signal is used to control the polarity of the voltage at the source of the tft of the display panel to be reversed between positive and negative polarity, typically once per frame, i.e., the polarity of the data voltages applied to the pixel circuits in adjacent frames is reversed in a video frame, for example: the polarity of the data voltage connected to each pixel circuit of the previous frame is positive, and the polarity of the data voltage connected to each pixel circuit of the next frame is negative. An abnormal state occurs at the moment when the display panel controls the turning of the POL signal every 28 seconds: the polarities of the data voltages which are accessed by the pixel circuits in the pictures of two adjacent frames are completely the same, and the abnormal state can cause the difference of positive and negative deflection angles of the liquid crystal.
For example: referring to fig. 2, in fig. 2, when POL is inverted once from the first Frame to the nth Frame, the Source polarity is also switched once, and a period of 28s is set to perform liquid crystal inversion (i.e. the POL signal is controlled to invert at time t1 as shown in fig. 3), instead of making POL always in a uniform inversion state, so that the original balance can be effectively broken, but in the period from time t1 to time t2, two continuous frames of images (2 x frames) keep the same Source polarity (i.e. as shown in fig. 2, the data voltage polarities of the two frames of the n+1 Frame and the n+2 Frame are negative), the voltage polarities of the two frames of the n+1 Frame and the n+2 Frame are negative, the voltage polarity of the next Frame of the n+3 Frame is positive, and then the absolute values of the voltages of the two frames of the n+1 Frame and the n+2 Frame (2 x Frame-) and the n+3 Frame (frame+) are different, as shown in fig. 3, the two polarities of the 2 x Frame-and the frame+ are asymmetric, so that the brightness is also different due to the occurrence of positive and negative deflection angles of liquid crystals, and the flicker problem is generated.
It should be noted that the fact that the 2 x frame liquid crystal molecules described in the example of fig. 2 have negative polarity is only an example, and it is not limited that the 2 x frame liquid crystal molecules of the present application must maintain negative polarity, and naturally, if the original polarity control signal is switched at the start time of the nth frame, the 2 x frame liquid crystal molecules maintain positive polarity.
According to the embodiment, the driving method of the display device can be executed when the processor 01 of the display device runs the corresponding computer program, when the POL signal needs to be controlled to overturn every preset period time, the switching voltage (off voltage or on voltage) of the images of the (n+1) th frame and the (n+2) th frame is adjusted, so that the technical problems can be solved, the flickering phenomenon of the display panel picture at the moment of overturning the polarity control signal can be eliminated or reduced, and the use experience of a user is improved.
Example two
As shown in fig. 4, a first embodiment of a driving method of a display panel provided by the present application is applied to the display device, and includes the following steps:
step S10, when a display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel, wherein the first switching voltage is output to a grid electrode of the thin film transistor by a power management integrated circuit, and n is a positive integer;
Step S20, acquiring the running time of the display panel at the end time of the nth frame of picture, and if the running time reaches a preset period time, acquiring a second switching voltage based on the first switching voltage, wherein the preset period time is used for triggering the inversion of the original polarity control signal.
It should be noted that, the execution body of the driving method of the display panel of this embodiment is a processor of the display device, and the timing controller TCON is taken as an example of the processor of the display device, for example, at the end time of each frame of picture of the display panel, whether the running time of the display panel reaches the preset cycle time may be determined by a timer inside the TCON.
The preset cycle time may be set to a time length between 20 seconds and 28 seconds, and in this embodiment, the preset cycle time is taken as an example for explaining that 28 seconds, and when the running time corresponding to the ending time t1 of the nth frame of picture is detected to reach the preset cycle time of 28 seconds, the second switching voltage is obtained based on the first switching voltage;
specifically, if the running time reaches a preset period time, the TCON searches a corresponding second switching voltage from a preset data table according to the first switching voltage; the preset data table is stored in a memory of the display device.
It can be understood that the first switching voltage of the present embodiment characterizes the off Voltage (VGL) or on Voltage (VGH) of a row of thin film transistor switches during the display panel displaying the nth frame of pictures; the second switching voltage represents the moment of controlling the POL signal to turn over every 28 seconds, and the display panel displays the off Voltage (VGL) or the on Voltage (VGH) of one row of thin film transistor switches in the period from the n+1st frame to the n+2nd frame; the mapping relation between the second switching voltage and the first switching voltage depends on the type of the display panel, and the second switching voltage can be preset data by a worker and is stored in a preset data table.
Step S30, generating a switch voltage adjustment signal according to the second switch voltage and sending the switch voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switch voltage to the grid electrode of the thin film transistor;
and S40, outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over.
As can be understood, when the POL signal needs to be controlled to turn over when reaching the preset cycle time, a second switching voltage required by each row of corresponding thin film transistors needs to be obtained before the n+1st frame and the n+2nd frame operate, as shown in fig. 5, the TCON generates a switching voltage adjustment signal according to the second switching voltage, and sends the required second switching voltage to a PMIC power management integrated circuit corresponding to the display panel, so that the PMIC outputs the second switching voltage to the gate of the thin film transistor; while the PMIC outputs the second switching voltage to the grid electrode of the thin film transistor, TCON outputs a target polarity control signal to the source electrode of the thin film transistor to drive the display panel to display an n+1st frame picture and an n+2nd frame picture, so that the PMIC charges or discharges each row of thin film transistors according to the second switching voltage during the display of the n+1st frame picture and the n+2nd frame picture;
in addition, in an embodiment, at the end time of the n+2th frame, a switching voltage recovery signal is sent to the power management integrated circuit, so that the power management integrated circuit outputs the first switching voltage to the gate of the thin film transistor.
The application adjusts the switching voltage of the thin film transistor of the display panel at the moment of controlling the polarity control signal of the display panel to overturn, thereby reducing the phenomenon of picture difference at the moment of overturning the polarity control signal.
Example III
As shown in fig. 6, a third embodiment of a driving method of a display panel according to the present application is applied to the display device, and this embodiment is described by taking a turn-on voltage VGH as a switching voltage of a thin film transistor as an example,
on the basis of the driving method of the display panel of the second embodiment, the driving method of the display panel of the third embodiment of the present application further includes the following technical solutions:
the step S10 includes:
step S101, when the display panel displays the nth frame of picture, obtaining a first starting voltage of each thin film transistor;
the step S20 includes:
step S201, acquiring an operation time of the display panel at an end time of the nth frame of picture, and if the operation time reaches a preset period time, acquiring a charging voltage increment of the thin film transistor based on the first starting voltage;
the step S30 includes:
step S301, generating a switching voltage adjustment signal according to the charging voltage increment and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second turn-on voltage to the gate of the thin film transistor, where the second turn-on voltage is generated based on the first turn-on voltage and the charging voltage increment.
The step S40 includes:
step S401, outputting, by the power management integrated circuit, the second start voltage to the gate of the thin film transistor, and outputting a target polarity control signal to the source of the thin film transistor, to drive the display panel to display an n+1st frame picture and an n+2nd frame picture, where the target polarity control signal is a signal after the original polarity control signal is turned over.
After the step S401, the method further includes:
step S501, at the end time of the n+2th frame of picture, sends an on voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first on voltage to the gate of the thin film transistor.
It can be understood that, referring to fig. 2, since the original polarity control signal is switched every 28 seconds, the time for maintaining one polarity of the liquid crystal voltage of the thin film transistor is increased from 1Frame to 2 frames, and the time is doubled, at this time, the charging rate of the liquid crystal of the thin film transistor is changed, so that the charging rates of the 2 frames are different from the previous charging rate of the 1Frame, and finally, the angles of the polarity liquid crystal deflection corresponding to the 2 frames are different, and the brightness is also different; therefore, the charging rate of the turn-on voltage VGH of the thin film transistor needs to be increased during the display of the n+1th frame and the n+2th frame, so as to offset the voltage of the liquid crystal molecules lost due to the increase of the electric leakage, and reduce the phenomenon of picture difference occurring at the moment of the polarity control signal inversion.
In a specific application, for example, the voltage vgh=30v maintained by the optimal thin film transistor corresponding to the nth Frame (Frame), and the charging voltage increment Δv corresponding to the first turn-on voltage 30V is 2V obtained by looking up the preset data table, then the second turn-on voltage vgh1=vgh+Δv=32v, so as to increase the charging rate of the thin film transistor of the display panel during the (n+1) th Frame and the (n+2) th Frame (2×frame), and supplement the leakage voltage during the (2×frame).
In the embodiment, at the moment of controlling the polarity control signal of the display panel to turn over, the charging rate of the VGH voltage of the liquid crystal molecules is increased to compensate the deviation of the voltage of the liquid crystal molecules caused by the lengthening of the leakage time, so that the phenomenon of picture difference at the moment of turning over the polarity control signal can be reduced.
Example IV
As shown in fig. 7, a third embodiment of a driving method of a display panel according to a fourth embodiment of the present application is applied to the display device, and this embodiment is described by taking an off voltage VGL as a switching voltage of a thin film transistor as an example,
on the basis of the driving method of the display panel of the second embodiment, the driving method of the display panel of the fourth embodiment of the present application further includes the following technical solutions: the step S10 includes:
Step S102, when the display panel displays the nth frame of picture, obtaining a first turn-off voltage of each thin film transistor;
the step S20 includes:
step S202, acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring the leakage voltage increment of the thin film transistor based on the first turn-off voltage if the running time reaches the preset period time;
the step S30 includes:
step S302, generating and sending a turn-off voltage adjustment signal to the power management integrated circuit according to the leakage voltage increment, so that the power management integrated circuit outputs a second turn-off voltage to the gate of the thin film transistor, wherein the second turn-off voltage is generated based on the first turn-off voltage and the leakage voltage increment.
The step S40 includes:
step S402, while the power management integrated circuit outputs the second off voltage to the gate of the thin film transistor, a target polarity control signal is output to the source of the thin film transistor, so as to drive the display panel to display an n+1st frame picture and an n+2nd frame picture, where the target polarity control signal is a signal after the original polarity control signal is turned over.
After the step S402, the method further includes:
step S502, at the end time of the n+2th frame of picture, sends an off voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first off voltage to the gate of the thin film transistor.
It can be understood that, referring to fig. 2, since the original polarity control signal is switched every 28 seconds, the time for maintaining one polarity of the liquid crystal voltage of the thin film transistor is increased from 1Frame to 2 frames, and the time is doubled, at this time, the leakage time of the liquid crystal of the thin film transistor is prolonged, the leakage voltage is also increased, and finally, the angles of deflection of the polar liquid crystal corresponding to 2 frames are different, and the brightness is also different;
at the moment of the polarity control signal inversion, the conventional holding voltage of the thin film transistor changes. Therefore, the off voltage VGL needs to be changed to achieve the same leakage as 1Frame, for example, in the conventional case that the leakage voltage of 1Frame is vgl= -6V, then the embodiment adjusts the leakage of 2 x Frame to VGL-8V so that the leakage condition of 2 x Frame and the leakage condition of 1Frame are consistent.
Therefore, the holding voltage is changed during the display of the n+1st frame and the n+2nd frame, for example, from VGL-6 V.fwdarw.8V. The leakage of the thin film transistor is optimized so that the leakage voltage of 2 x frame=the leakage voltage of 1Frame, and the natural brightness will not be different even if the leakage voltages are the same.
In a specific application, for example, the voltage vgl= -6V held by the conventional thin film transistor corresponding to the nth Frame (Frame), the absolute value of the first turn-off voltage-6V in the corresponding leakage voltage increment Δv is 2V by looking up the preset data table, and then the second turn-off voltage vgl1=vgl±Δv= -8V is used to increase the leakage of the thin film transistor of the display panel during the (n+1) th Frame and the (n+2) th Frame (2 x Frame), so that the leakage state during the (2 x Frame) and the leakage state during the (1 x Frame) Frame are synchronized.
In the embodiment, the leakage rate of the off voltage VGL voltage of the liquid crystal molecules is increased at the moment of controlling the polarity control signal of the display panel to be turned over, so that the phenomenon of picture difference at the moment of turning over the polarity control signal can be reduced.
Example five
A fifth embodiment of the present application provides a driving apparatus 200 for a display panel, which is used for executing the driving method for the display panel in the first embodiment. The driving device 200 may be a virtual device (virtual appliance) in the display apparatus, which is executed by the processor 01 of the display apparatus, or may be the display apparatus itself, including:
an obtaining module 21, configured to obtain a first switching voltage of each thin film transistor in a display panel when the display panel displays an nth frame of picture, where n is a positive integer, and the first switching voltage is output to a gate of the thin film transistor by a power management integrated circuit;
A calling module 22, configured to obtain an operation time of the display panel at an end time of the nth frame of picture, and if the operation time reaches a preset period time, obtain a second switching voltage based on the first switching voltage, where the preset period time is used to trigger the inversion of an original polarity control signal;
an output module 23, configured to generate a switching voltage adjustment signal according to the second switching voltage and send the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the gate of the thin film transistor;
the driving module 24 is configured to output a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and drive the display panel to display an n+1st frame picture and an n+2nd frame picture, where the target polarity control signal is a signal after the original polarity control signal is inverted.
In application, each module in the driving device of the display device may be a software program unit, or may be implemented by different logic circuits integrated in the driving circuit integrated chip or separate physical components connected with the processor.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein.
It will be apparent to those skilled in the art that the above-described functional units are merely illustrated in terms of division for convenience and brevity, and that in practical applications, the above-described functional distribution may be performed by different functional units, i.e., the internal structure of the apparatus is divided into different functional units, so as to perform all or part of the above-described functions. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In addition, the embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and the steps in the embodiment of the display panel driving method can be realized when the computer program is executed by a processor.
Embodiments of the present application provide a computer program product enabling a display device to carry out the steps of the above-described embodiments of the display panel driving method when the computer program product is run on the display device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 solution. 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 and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. A driving method of a display panel, comprising:
when a display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel, wherein the first switching voltage is output to a grid electrode of the thin film transistor by a power management integrated circuit, and n is a positive integer;
acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring a second switching voltage based on the first switching voltage if the running time reaches a preset period time, wherein the preset period time is used for triggering the turning of an original polarity control signal;
generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the grid electrode of the thin film transistor;
outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over;
When the display panel displays the nth frame of picture, the first switching voltage of each thin film transistor in the display panel is obtained, and the method comprises the following steps:
when a display panel displays an nth frame of picture, acquiring a first turn-off voltage of each thin film transistor in the display panel;
and if the running time reaches a preset period time, acquiring a second switching voltage based on the first switching voltage, including:
if the running time reaches the preset period time, acquiring the leakage voltage increment of the thin film transistor based on the first turn-off voltage;
the generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the gate of the thin film transistor, including:
and generating and sending a turn-off voltage adjustment signal to the power management integrated circuit according to the leakage voltage increment, so that the power management integrated circuit outputs a second turn-off voltage to the grid electrode of the thin film transistor, wherein the second turn-off voltage is generated based on the first turn-off voltage and the leakage voltage increment.
2. The driving method according to claim 1, wherein after the step of outputting a target polarity control signal to the source of the thin film transistor to drive the display panel to display an n+1st frame and an n+2nd frame, the driving method further comprises:
and at the end time of the n+2 frame picture, sending an off voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first off voltage to the grid electrode of the thin film transistor.
3. A driving method of a display panel, comprising:
when a display panel displays an nth frame of picture, acquiring a first switching voltage of each thin film transistor in the display panel, wherein the first switching voltage is output to a grid electrode of the thin film transistor by a power management integrated circuit, and n is a positive integer;
acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring a second switching voltage based on the first switching voltage if the running time reaches a preset period time, wherein the preset period time is used for triggering the turning of an original polarity control signal;
generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the grid electrode of the thin film transistor;
Outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over;
when the display panel displays the nth frame of picture, the first switching voltage of each thin film transistor in the display panel is obtained, and the method comprises the following steps:
when a display panel displays an nth frame of picture, acquiring a first starting voltage of each thin film transistor in the display panel;
and if the running time reaches a preset period time, acquiring a second switching voltage based on the first switching voltage, including:
if the running time reaches the preset period time, acquiring a charging voltage increment of the thin film transistor based on the first starting voltage;
the generating a switching voltage adjustment signal according to the second switching voltage and sending the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs the second switching voltage to the gate of the thin film transistor, including:
And generating a switching voltage adjustment signal according to the charging voltage increment and sending the switching voltage adjustment signal to the power management integrated circuit so that the power management integrated circuit outputs a second starting voltage to the grid electrode of the thin film transistor, wherein the second starting voltage is generated based on the first starting voltage and the charging voltage increment.
4. The driving method of claim 3, wherein after the step of outputting a target polarity control signal to the source of the thin film transistor to drive the display panel to display an n+1st frame and an n+2nd frame, the method further comprises:
and at the end time of the n+2 frame picture, sending an on voltage recovery signal to the power management integrated circuit, so that the power management integrated circuit outputs the first on voltage to the grid electrode of the thin film transistor.
5. The driving method according to any one of claims 1 to 4, wherein the acquiring a second switching voltage based on the first switching voltage if the operation time reaches a preset cycle time includes:
and if the running time reaches the preset period time, searching a corresponding second switching voltage from a preset data table according to the first switching voltage.
6. The driving method as claimed in claim 5, wherein the step of searching for the corresponding second switching voltage from a preset data table according to the first switching voltage if the operation time reaches a preset cycle time comprises:
if the running time reaches the preset period time, determining the panel type of the display panel;
determining a preset data table corresponding to the panel type;
and searching a corresponding second switching voltage from the preset data table according to the first switching voltage.
7. A driving device of a display panel, comprising:
the switching voltage acquisition module is used for acquiring a first switching voltage of each thin film transistor in the display panel when the display panel displays an nth frame of picture, and the first switching voltage is output to the grid electrode of the thin film transistor by the power management integrated circuit, wherein n is a positive integer; the calling module is used for acquiring the running time of the display panel at the end time of the nth frame of picture, and acquiring a second switching voltage based on the first switching voltage if the running time reaches a preset period time, wherein the preset period time is used for triggering the turning of an original polarity control signal; the output module is used for generating a switch voltage adjustment signal according to the second switch voltage and sending the switch voltage adjustment signal to the power management integrated circuit so that the power management integrated circuit outputs the second switch voltage to the grid electrode of the thin film transistor;
The driving module is used for outputting a target polarity control signal to the source electrode of the thin film transistor while the power management integrated circuit outputs the second switching voltage to the gate electrode of the thin film transistor, and driving the display panel to display an n+1st frame picture and an n+2nd frame picture, wherein the target polarity control signal is a signal after the original polarity control signal is turned over;
the switching voltage acquisition module is further used for acquiring a first turn-off voltage of each thin film transistor in the display panel when the display panel displays an nth frame of picture;
the calling module is further configured to obtain a leakage voltage increment of the thin film transistor based on the first turn-off voltage if the running time reaches a preset cycle time;
the output module is further configured to generate and send a turn-off voltage adjustment signal to the power management integrated circuit according to the leakage voltage increment, so that the power management integrated circuit outputs a second turn-off voltage to the gate of the thin film transistor, where the second turn-off voltage is generated based on the first turn-off voltage and the leakage voltage increment;
or (b)
The switching voltage acquisition module is further used for acquiring a first starting voltage of each thin film transistor in the display panel when the display panel displays an nth frame of picture;
The calling module is further configured to obtain a charging voltage increment of the thin film transistor based on the first starting voltage if the running time reaches a preset cycle time;
the output module is further configured to generate a switching voltage adjustment signal according to the charging voltage increment and send the switching voltage adjustment signal to the power management integrated circuit, so that the power management integrated circuit outputs a second starting voltage to the gate of the thin film transistor, where the second starting voltage is generated based on the first starting voltage and the charging voltage increment.
8. A display device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the driving method according to any one of claims 1 to 6 when the computer program is executed.
9. A storage medium being a computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the driving method according to any one of claims 1 to 6.
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