CN111028807A - Driving circuit and driving method of liquid crystal display panel - Google Patents
Driving circuit and driving method of liquid crystal display panel Download PDFInfo
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- CN111028807A CN111028807A CN201911348800.1A CN201911348800A CN111028807A CN 111028807 A CN111028807 A CN 111028807A CN 201911348800 A CN201911348800 A CN 201911348800A CN 111028807 A CN111028807 A CN 111028807A
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- 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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Abstract
The application discloses liquid crystal display panel drive circuit: the power supply unit comprises a level conversion unit, a power supply unit, a first voltage division unit, a second voltage division unit and a data driving unit; when the liquid crystal display panel is shut down, the first output voltage (VSS _ O) output to the grid electrode of the thin film transistor in the pixel unit of the liquid crystal display panel is pulled up to a constant voltage high Voltage (VGH) by the level conversion unit, and the second output voltage output to the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel is output to a common Voltage (VCOM) by the data driving unit, so that the phenomenon of screen flash when the liquid crystal display panel is shut down is effectively improved.
Description
Technical Field
The present disclosure relates to display driving technologies, and in particular, to a driving circuit and a driving method for a liquid crystal display panel.
Background
With the continuous development of the manufacturing technology of the liquid crystal display device industry, the Gate scan driving circuit is directly manufactured on a thin film transistor Array substrate (GOA) by using an Array process to replace an external Gate scan driving chip technology, which becomes a hot point content of development of many liquid crystal panel manufacturers, so as to further reduce the production cost. The GOA technology can use the array process of the liquid crystal panel to manufacture the gate scanning driving circuit on the array substrate, so as to realize the driving mode of scanning the gate line by line.
As shown in fig. 1, a circuit diagram of a conventional liquid crystal panel driving circuit is shown, the liquid crystal panel driving circuit includes a level shifter unit, a power supply unit, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, wherein a first input terminal of the level shifter unit is connected to a first input voltage (VSS _ I) generated by a timing controller, a second input terminal of the level shifter unit is electrically connected to a second terminal of the first resistor R1, and an output terminal of the level shifter unit is electrically connected to a gate of a thin film transistor in a pixel unit of a liquid crystal display panel; the output end of the power supply unit is electrically connected with the first end of the first resistor R1; the second end of the first resistor R1 is electrically connected with the first end of the second resistor R2; a second end of the second resistor R2 is grounded; a first end of the first capacitor C1 is electrically connected to the output end of the level shifting unit, and a second end is grounded; a first end of the second capacitor C2 is electrically connected to the output end of the level shifting unit, and a second end is grounded; when the liquid crystal display panel is driven by the liquid crystal panel driving circuit, when the liquid crystal display panel normally works, the power supply unit inputs working voltage to the first end of the first resistor R1, the working voltage is output to the level conversion unit after being divided by the first resistor R1 to supply power to the level conversion unit so as to normally work, and the level conversion unit carries out level conversion on the first input voltage (VSS _ I) output by the time schedule controller and outputs a first output voltage (VSS _ O) to the grid electrode of the thin film transistor in the pixel unit in the liquid crystal display panel; when the liquid crystal display panel is powered off, the power supply unit inputs a power-off voltage to the first end of the first resistor R1, the power-off voltage is smaller than a working voltage (generally smaller than 10V), the power-off voltage is divided by the first resistor R1 and then input to the second input end of the level conversion unit, at the moment, the level conversion unit performs the action of raising the first output voltage (VSS _ O) output to the liquid crystal display panel to a constant voltage high Voltage (VGH), and the purpose is to open a TFT in a pixel of the liquid crystal display panel at the moment of power-off so as to discharge the pixel area and eliminate the shutdown ghost. The first capacitor C1 and the second capacitor C2 are provided to ensure that the first output voltage (VSS _ O) inputted to the gate of the thin film transistor in the pixel unit of the liquid crystal display panel is stabilized during normal operation, and to reduce the ripple of the first output voltage (VSS _ O). However, when the level shifter performs the operation of pulling the first output voltage (VSS _ O) up to the constant high Voltage (VGH), due to the arrangement of the first capacitor C1 and the second capacitor C2, a part of the voltage is divided into the first capacitor C1 and the second capacitor C2, so that the first output voltage (VSS _ O) inputted to the gate of the TFT in the pixel unit in the liquid crystal display panel by the level shifter cannot reach the constant high voltage (generally only 4V), and further the TFT in the liquid crystal display panel cannot be fully turned on, resulting in a voltage difference between the voltage outputted from the data driver to the source of the TFT and the common voltage, thereby causing a voltage difference between the two terminals of the liquid crystal capacitor Clc in the liquid crystal display panel (one terminal of the liquid crystal capacitor Clc in the liquid crystal display panel is connected to the common Voltage (VCOM), the other terminal is connected to the source of the TFT, and the voltage on the source of the thin film transistor is provided by the data driver), finally, the liquid crystal display panel is caused to flash when the liquid crystal display panel is turned off.
In summary, in the conventional driving circuit and driving method for the liquid crystal display panel, when the power supply unit outputs the shutdown voltage, the voltage output from the data driving unit to the source of the thin film transistor has a voltage difference with the common voltage, so that a voltage difference is generated across two ends of a liquid crystal capacitor in the liquid crystal display panel, and finally, the liquid crystal display panel is subjected to screen flashing when the liquid crystal display panel is shutdown.
Disclosure of Invention
The driving circuit and the driving method for the liquid crystal display panel can avoid the problem that the liquid crystal display panel has screen flashing when the liquid crystal display panel is shut down, and solve the technical problem that when the power supply unit outputs shutdown voltage, the voltage output to the source electrode of the thin film transistor by the data driving unit is different from the common voltage, so that the two ends of a liquid crystal capacitor in the liquid crystal display panel generate voltage difference, and finally the screen flashing of the liquid crystal display panel is caused when the liquid crystal display panel is shut down.
The embodiment of the application provides a driving circuit of a liquid crystal display panel, which comprises a level conversion unit, a power supply unit, a first voltage division unit, a second voltage division unit and a data driving unit; the first input end of the level conversion unit is connected to a first input voltage (VSS _ I) output by the time schedule controller, the output end of the level conversion unit is electrically connected with a grid electrode of a thin film transistor in a pixel unit of the liquid crystal display panel, and the second input end of the level conversion unit is electrically connected with the second end of the first voltage division unit; the output end of the power supply unit is electrically connected with the first end of the first voltage division unit; the second end of the first voltage division unit is electrically connected with the first end of the second voltage division unit; the second end of the second voltage division unit is connected to a grounding end; the input end of the data driving unit is electrically connected to the second input voltage output by the time sequence controller, and the output end of the data driving unit is electrically connected to the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel;
the power supply unit is used for outputting working voltage or shutdown voltage; the level conversion unit is used for performing level conversion on the first input voltage (VSS _ I) when the power supply unit outputs working voltage, outputting first output voltage (VSS _ O) with low potential to a grid electrode of a thin film transistor in a pixel unit of the liquid crystal display panel, and pulling the first output voltage (VSS _ O) to be high in constant voltage and high in VGH when the power supply unit outputs shutdown voltage; the data driving unit is used for outputting a second output voltage to a source electrode of a thin film transistor in a pixel unit of the liquid crystal display panel according to a normal display picture when the power supply unit outputs a working voltage, and outputting the second output voltage to a common Voltage (VCOM) when the power supply unit outputs a shutdown voltage.
In some embodiments, the data driving unit includes a plurality of sets of data driving modules, each of the data driving modules includes a control module and a plurality of N-type switch units.
In some embodiments, the number of the control modules is the same as the number of the groups of the data driving modules, and the number of the N-type switching units is the same as the number of the data lines in the liquid crystal display panel.
In some embodiments, a control terminal of each of the N-type switch units is electrically connected to the control module, a first terminal of each of the N-type switch units is connected to the common Voltage (VCOM), and a second terminal of each of the N-type switch units is electrically connected to a source of a corresponding tft in a pixel unit of the lcd panel.
In some embodiments, when the power supply unit outputs the operating voltage, the control module controls the plurality of N-type switch units to be turned off, and at this time, the first ends of the plurality of N-type switch units are turned off, and the output end of the data driving unit outputs the second output voltage to the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel according to a normal display image; when the power supply unit outputs a shutdown voltage, the control module controls the plurality of N-type switch units to be turned on, at this time, first ends of the plurality of N-type switch units are turned on, and the second output voltage output to the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel is output to the common Voltage (VCOM).
In some embodiments, the N-type switch units are all N-type field effect transistors, gates of the N-type field effect transistors are control terminals of the N-type switch units, sources of the N-type field effect transistors are first terminals of the N-type switch units, and drains of the N-type field effect transistors are second terminals of the N-type switch units.
In some embodiments, the first voltage dividing unit and the second voltage dividing unit are a first resistor and a second resistor, respectively.
In some embodiments, the driving circuit of the liquid crystal display panel further includes a first capacitor C1 and a second capacitor C2, the first end of the first capacitor C1 and the first end of the second capacitor C2 are both electrically connected to the output end of the level shifter, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded.
In some embodiments, the operating voltage has a voltage value ranging between 10.8V to 13V; the voltage value of the shutdown voltage is less than 10V.
An embodiment of the present application further provides a liquid crystal display panel driving method, applied to any one of the liquid crystal panel driving circuits described above, the method including:
s10, a power supply unit outputs a working voltage, the working voltage is divided by the first voltage dividing unit and then respectively input to a level shifter unit and a data driver unit through a timing controller, the level shifter unit performs level shifting on a received first input voltage (VSS _ I) and outputs a first output voltage (VSS _ O) of a low potential to gates of thin film transistors in pixel units of the liquid crystal display panel, and the data driver unit outputs a second output voltage to sources of the thin film transistors in the pixel units of the liquid crystal display panel according to a normal display screen for the received second input voltage;
s20, the power supply unit outputs a shutdown voltage, the shutdown voltage is divided by the first voltage dividing unit and then respectively input to a level shifter unit and a data driving unit through a timing controller, the level shifter unit pulls up the first output voltage (VSS _ O) input to the gate of the tft in the pixel unit of the lcd panel to a constant voltage high Voltage (VGH), and the data driving unit outputs the second output voltage input to the source of the tft in the pixel unit of the lcd panel to a common Voltage (VCOM).
According to the driving circuit and the driving method of the liquid crystal display panel, when the power supply unit inputs the shutdown voltage, the data driving unit outputs the output voltage of the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel to the common voltage, the voltage difference between two ends of the liquid crystal capacitor is effectively eliminated, and the screen flash of the liquid crystal display panel is further avoided when the liquid crystal display panel is shut down.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic circuit diagram of a conventional driving circuit of a liquid crystal display panel;
FIG. 2 is a schematic circuit diagram of a driving circuit of a liquid crystal display panel according to an embodiment of the present application;
fig. 3 is a flowchart of a driving method of a liquid crystal display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and 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.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application aims at the existing driving circuit and driving method of the liquid crystal display panel, when the power supply unit outputs the shutdown voltage, the voltage output to the source electrode of the thin film transistor by the data driving unit has a voltage difference with the common voltage, so that the voltage difference is generated at two ends of a liquid crystal capacitor in the liquid crystal display panel, and finally the technical problem of screen flash of the liquid crystal display panel when the liquid crystal display panel is shut down can be solved.
As shown in fig. 2, a schematic diagram of a driving circuit of a liquid crystal display panel is provided in the embodiment of the present application, and a pixel resolution of the liquid crystal display panel 10 is described by taking 1920 × 1080 as an example. The driving circuit of the liquid crystal display panel 10 includes a level converting unit 100, a power supplying unit 200, a first voltage dividing unit 300, a second voltage dividing unit 400, and a data driving unit;
a first input terminal of the level shifter unit 100 is connected to a first input voltage (VSS _ I) outputted by the timing controller, an output terminal of the level shifter unit is electrically connected to a gate of a thin film transistor in a pixel unit of the liquid crystal display panel 10, and a second input terminal of the level shifter unit is electrically connected to a second terminal of the first voltage divider unit 300; the output end of the power supply unit 200 is electrically connected to the first end of the first voltage division unit 300; the second end of the first voltage dividing unit 300 is electrically connected to the first end of the second voltage dividing unit 400; a second end of the second voltage division unit 400 is connected to a ground terminal; a first end of the first capacitor C1 is electrically connected to the output end of the level shifter unit 100, and a second end thereof is connected to the ground end; the input terminal of the data driving unit is electrically connected to the second input voltage outputted by the timing controller, and the output terminal of the data driving unit is electrically connected to the source electrode of the thin film transistor T in the liquid crystal display panel 10.
Specifically, the data driving unit includes a plurality of sets of data driving modules 500, and each data driving module 500 includes a control module 510 and a plurality of N-type switch units 520; the number of the control modules 510 is the same as the number of the groups of the data driving modules 500, and the number of the N-type switch units 520 is the same as the number of the data lines in the liquid crystal display panel 10. Preferably, when the pixel resolution of the liquid crystal display panel 10 is 1920 × 1080, the number of data lines of the liquid crystal display panel 10 is 1920 × 3, and the number of scanning lines of the liquid crystal display panel 10 is 1080; at this time, the data driving units are divided into 6 groups of the data driving modules 500, each group of the data driving modules 500 includes 1 control module 510 and 960N-type switching units 520, that is, each N-type switching unit 520 corresponds to one data line.
Specifically, a control terminal of each of the N-type switch units 520 is electrically connected to the control module 510, a first terminal is connected to a common Voltage (VCOM), and a second terminal is electrically connected to a source of the corresponding tft T in the pixel unit of the lcd panel 10.
Preferably, the N-type switch units 520 are all N-type field effect transistors, a gate of each N-type field effect transistor is a control terminal of the N-type switch unit 520, a source of each N-type field effect transistor is a first terminal of the N-type switch unit 520, and a drain of each N-type field effect transistor is a second terminal of the N-type switch unit 520.
Specifically, the first voltage divider 300 and the second voltage divider 400 are a first resistor R1 and a second resistor R2, respectively.
Specifically, the driving circuit of the liquid crystal display panel 10 further includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 and a first end of the second capacitor C2 are both electrically connected to the output end of the level shifter unit 100, and a second end of the first capacitor C1 and a second end of the second capacitor C2 are both connected to the ground. The first capacitor C1 and the second capacitor C2 are provided to ensure stability of the first output voltage (VSS-O) inputted to the gate of the thin film transistor T in the pixel unit of the liquid crystal display panel 10 during normal operation, and to reduce ripple (ripple) of the first output voltage (VSS-O).
Specifically, the power supply unit 200 is configured to output an operating voltage or a shutdown voltage.
Specifically, the level shift unit 100 is configured to shift the first input voltage (VSS _ I) to a level when the power supply unit 200 outputs the operating voltage, output a first output voltage (VSS _ O) to a gate of a thin film transistor T in a pixel unit of the liquid crystal display panel 10, and pull up the first output voltage (VSS _ O) to a constant high Voltage (VGH) when the power supply unit 200 outputs the shutdown voltage.
Specifically, the data driving unit is configured to, when the power supply unit 200 outputs a working voltage, the data driving modules 500 in the data driving unit simultaneously output a second output voltage to the source of the thin film transistor T in the pixel unit of the liquid crystal display panel 10 according to a normal display image, and when the power supply unit 200 outputs a shutdown voltage, pull the second output voltage to a common Voltage (VCOM).
The working process of the driving circuit of the liquid crystal display panel provided in the embodiment of the present application is as follows (taking a liquid crystal display panel with a resolution of 1920 × 1080 as an example):
first, in a normal state, the power supply unit 200 inputs an operating voltage to a first end of the first voltage dividing unit 300, a voltage value of the operating voltage ranges from 10.8V to 13V, the operating voltage is divided by the first voltage dividing unit 300 and then is input to the level converting unit 100 and the data driving unit through the timing controller, respectively, after the level converting unit 100 receives a first input voltage (VSS _ I) from the timing controller, the level converting unit 100 performs level conversion on the first input voltage (VSS _ I) and outputs a first output voltage VSS _ O to a gate of a thin film transistor T in a pixel unit of the liquid crystal display panel 10, and the first capacitor C1 and the second capacitor C2 perform ripple cancellation on the first output voltage (VSS _ O) output from an output end of the level converting unit 100, the ripple-removed first output voltage (VSS _ O) is input to the gate of the thin film transistor T in the pixel unit of the liquid crystal display panel 10, ensuring that the first output voltage (VSS _ O) input to the gate of the thin film transistor T in the pixel unit of the liquid crystal display panel 10 is stable; meanwhile, after the data control unit receives a second input voltage from the timing controller, the control module 510 in 6 groups of the data driving modules 500 in the data driving unit controls 960N-type switch units 520 to be turned off, and at this time, first terminals of the 960N-type switch units are turned off, so that the second output voltages (OUT1, OUT2, OUT3 … OUT960) output to sources of thin film transistors in pixel cells of the liquid crystal display panel 10 are turned off from a common voltage VCOM applied to the first terminals of the N-type switch units 520. The output end of the data driving unit outputs the second output voltage to the source of the thin film transistor in the pixel unit of the liquid crystal display panel 10 according to the normal display picture.
Then, when the power supply unit 200 is powered off, the power supply unit inputs a power-off voltage to the first end of the first voltage division unit 300, and the voltage value of the power-off voltage is less than 10V. The shutdown voltage is divided by the first voltage dividing unit 300 and then input to the level converting unit 100 and the data driving unit through the timing controller, the level converting unit 100 receives a first input voltage (VSS _ I) from the timing controller, and then pulls up the first output voltage (VSS _ O) output to the gate of the tft in the pixel unit of the lcd panel 10 to a constant high Voltage (VGH), because of the first capacitor C1 and the second capacitor C2, a part of the voltage is divided into the first capacitor C1 and the second capacitor C2, so that the first output voltage (VSS _ O) input to the gate of the tft in the pixel unit of the lcd panel 10 by the level converting unit cannot reach the constant high voltage (generally can only reach 4V), thereby making the thin film transistor in the liquid crystal display panel 10 not fully turned on.
Meanwhile, after the data control unit receives a second input voltage which is sent by the timing controller and enables the thin film transistors in the liquid crystal display panel 10 not to be fully turned on, the control module 510 in 6 groups of the data driving modules 500 in the data driving unit controls 960N-type switch units 520 to be turned on, at this time, the first terminals of the 960N-type switch units are turned on, and the second output voltages (OUT1, OUT2, OUT3 … OUT960) which are output by the 6 groups of the data driving modules 500 to the sources of the thin film transistors in the pixel units of the liquid crystal display panel 10 are turned on with the common Voltage (VCOM) connected to the first terminals of the N-type switch units 520. Since one end of each liquid crystal capacitor in the liquid crystal display panel 10 is connected to a common voltage (Vcom) and the other end is connected to a source of the thin film transistor, a voltage on the source of the thin film transistor is provided by the data driving unit. At this time, the voltages at two ends of the liquid crystal capacitors (C1, C2, C3 … C960) have no voltage difference because the voltages are all common voltage values Vcom, and the capacitors of the first capacitor C1 and the second capacitor C2 are reduced, so that the voltage which can be reached by the first output voltage (VSS _ O) is higher (close to constant-voltage high voltage as much as possible), the thin film transistor is enabled to be completely turned on, the discharging speed is increased, and the problem of shutdown screen flash is solved.
As shown in fig. 3 and with reference to fig. 2, based on the same inventive concept, an embodiment of the present application further provides a driving method of a liquid crystal display panel, which is applied to the driving circuit of the liquid crystal display panel, where the method includes:
s10, the power supply unit 200 outputs a working voltage, the working voltage is divided by the first voltage dividing unit 300 and then respectively input to the level converting unit 100 and the data driving unit through the timing controller, the level converting unit 100 performs level conversion on the received first input voltage (VSS _ I), outputs a first output voltage (VSS _ O) with a low potential to the gate of the tft in the pixel unit of the liquid crystal display panel 10, and the data driving unit outputs a second output voltage to the source of the tft in the pixel unit of the liquid crystal display panel 10 according to the normal display screen.
Specifically, the S10 further includes:
the resolution of the liquid crystal display panel is 1920 × 1080 for example. In a normal state, the power supply unit 200 inputs a working voltage to a first end of the first voltage dividing unit 300, a voltage value of the working voltage ranges from 10.8V to 13V, the working voltage is divided by the first voltage dividing unit 300 and then is respectively input to the level converting unit 100 and the data driving unit through the timing controller, after the level converting unit 100 receives a first input voltage (VSS _ I) sent by the timing controller, the level converting unit 100 performs level conversion on the first input voltage (VSS _ I) and outputs a first output voltage (VSS _ O) to a gate of a thin film transistor T in a pixel unit of the liquid crystal display panel 10; meanwhile, after the data control unit receives a second input voltage from the timing controller, the control module 510 in 6 groups of the data driving modules 500 in the data driving unit controls 960N-type switch units 520 to be turned off, and at this time, first terminals of the 960N-type switch units are turned off, so that the second output voltages (OUT1, OUT2, OUT3 … OUT960) output to sources of thin film transistors in pixel cells of the liquid crystal display panel 10 are turned off from a common voltage VCOM applied to the first terminals of the N-type switch units 520. The output end of the data driving unit outputs the second output voltage to the source of the thin film transistor in the pixel unit of the liquid crystal display panel 10 according to the normal display picture.
Specifically, the first voltage divider 300 and the second voltage divider 400 are a first resistor and a second resistor, respectively.
Specifically, a control terminal of each of the N-type switch units 520 is electrically connected to the control module 510, a first terminal thereof is connected to a common voltage VCOM, and a second terminal thereof is electrically connected to a source of the corresponding tft T in the pixel unit of the lcd panel 10.
Preferably, the N-type switch units 520 are all N-type field effect transistors, a gate of each N-type field effect transistor is a control terminal of the N-type switch unit 520, a source of each N-type field effect transistor is a first terminal of the N-type switch unit 520, and a drain of each N-type field effect transistor is a second terminal of the N-type switch unit 520.
Specifically, the driving circuit of the liquid crystal display panel 10 further includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 and a first end of the second capacitor C2 are both electrically connected to the output end of the level shifter unit 100, and a second end of the first capacitor C1 and a second end of the second capacitor C2 are both connected to the ground. The first capacitor C1 and the second capacitor C2 are provided to ensure stability of the first output voltage VSS-O input to the gate of the thin film transistor T in the pixel unit of the liquid crystal display panel 10 during normal operation, and to reduce ripple (ripple) of the first output voltage VSS-O.
S20, the power supply unit outputs a shutdown voltage, the shutdown voltage is divided by the first voltage dividing unit 300 and then respectively input to the level shifter 100 and the data driving unit through the timing controller, the level shifter 100 pulls up the first output voltage (VSS _ O) input to the gate of the tft in the pixel unit of the lcd panel 10 to a constant voltage high Voltage (VGH), and the data driving unit outputs the second output voltage input to the source of the tft in the pixel unit of the lcd panel 10 to a common Voltage (VCOM).
Specifically, the S20 further includes:
the power supply unit 200 inputs a shutdown voltage to the first end of the first voltage division unit 300, and the voltage value of the shutdown voltage is less than 10V. The shutdown voltage is divided by the first voltage dividing unit 300 and then input to the level converting unit 100 and the data driving unit through the timing controller, and after receiving a first input voltage (VSS _ I) from the timing controller, the level converting unit 100 pulls up the first output voltage (VSS _ O) output to the gate of the thin film transistor in the pixel unit of the liquid crystal display panel 10 to a constant voltage high Voltage (VGH). Due to the arrangement of the first capacitor C1 and the second capacitor C2, a partial voltage is divided into the first capacitor C1 and the second capacitor C2, so that the first output voltage (VSS _ O) inputted to the gate of the tft in the pixel unit of the lcd panel 10 by the level shifter unit cannot reach a constant high voltage (generally, only 4V), and the tft in the lcd panel 10 cannot be turned on completely.
Meanwhile, after the data control unit receives a second input voltage which is sent by the timing controller and enables the thin film transistors in the liquid crystal display panel 10 not to be fully turned on, the control module 510 in 6 groups of the data driving modules 500 in the data driving unit controls 960N-type switch units 520 to be turned on, at this time, the first terminals of the 960N-type switch units are turned on, and the second output voltages (OUT1, OUT2, OUT3 … OUT960) which are output by the 6 groups of the data driving modules 500 to the sources of the thin film transistors in the pixel units of the liquid crystal display panel 10 are turned on with the common Voltage (VCOM) connected to the first terminals of the N-type switch units 520. Since one end of each liquid crystal capacitor in the liquid crystal display panel 10 is connected to the common voltage Vcom and the other end is connected to the source of the thin film transistor, the voltage on the source of the thin film transistor is provided by the data driving unit. At this time, the voltages at two ends of the liquid crystal capacitors (C1, C2, C3 … C960) have no voltage difference because the voltages are all common voltage values Vcom, and the capacitors of the first capacitor C1 and the second capacitor C2 are reduced, so that the voltage which can be reached by the first output voltage (VSS _ O) is higher (close to constant-voltage high voltage as much as possible), the thin film transistor is enabled to be completely turned on, the discharging speed is increased, and the problem of shutdown screen flash is solved.
According to the driving circuit and the driving method of the liquid crystal display panel, when the power supply unit inputs the shutdown voltage, the data driving unit outputs the output voltage of the source electrode of the thin film transistor in the pixel unit of the liquid crystal display panel to the common voltage, the voltage difference between two ends of the liquid crystal capacitor is effectively eliminated, and the screen flash of the liquid crystal display panel is further avoided when the liquid crystal display panel is shut down.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail a driving circuit and a driving method of a liquid crystal display panel provided in an embodiment of the present application, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| WO2022226681A1 (en) * | 2021-04-25 | 2022-11-03 | 京东方科技集团股份有限公司 | Display apparatus and control method therefor |
| CN115331598A (en) * | 2022-08-25 | 2022-11-11 | 信利(仁寿)高端显示科技有限公司 | Test board and test method for actual charging rate of display panel |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487494A (en) * | 2002-07-12 | 2004-04-07 | ���ṫ˾ | Liquid crystal display device, method of controlling the device, and portable terminal |
| KR20150030541A (en) * | 2013-09-12 | 2015-03-20 | 엘지디스플레이 주식회사 | Liquid crystal display device incuding gate driver |
| CN104616615A (en) * | 2015-02-10 | 2015-05-13 | 昆山龙腾光电有限公司 | Screen clearing circuit and display device |
| CN105632435A (en) * | 2016-01-05 | 2016-06-01 | 京东方科技集团股份有限公司 | Residual image circuit for switching on/off and method for removing residual image of switching on/off |
| CN106356033A (en) * | 2016-11-21 | 2017-01-25 | 京东方科技集团股份有限公司 | Shutdown discharging circuit and method, display module and display device |
| CN107193168A (en) * | 2017-07-17 | 2017-09-22 | 深圳市华星光电半导体显示技术有限公司 | A kind of array base palte and display panel |
| CN107516503A (en) * | 2017-10-12 | 2017-12-26 | 深圳市华星光电技术有限公司 | Liquid crystal panel drive circuit and liquid crystal panel drive method |
| CN107633832A (en) * | 2017-10-25 | 2018-01-26 | 南京中电熊猫平板显示科技有限公司 | Liquid crystal display device and its driving method |
| CN108962170A (en) * | 2018-07-26 | 2018-12-07 | 京东方科技集团股份有限公司 | Shut down discharge circuit, display base plate and shutdown charging method |
| CN109671413A (en) * | 2019-02-26 | 2019-04-23 | 合肥京东方显示技术有限公司 | Booster circuit and shutdown circuit and their driving method and display device |
-
2019
- 2019-12-24 CN CN201911348800.1A patent/CN111028807A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487494A (en) * | 2002-07-12 | 2004-04-07 | ���ṫ˾ | Liquid crystal display device, method of controlling the device, and portable terminal |
| KR20150030541A (en) * | 2013-09-12 | 2015-03-20 | 엘지디스플레이 주식회사 | Liquid crystal display device incuding gate driver |
| CN104616615A (en) * | 2015-02-10 | 2015-05-13 | 昆山龙腾光电有限公司 | Screen clearing circuit and display device |
| CN105632435A (en) * | 2016-01-05 | 2016-06-01 | 京东方科技集团股份有限公司 | Residual image circuit for switching on/off and method for removing residual image of switching on/off |
| CN106356033A (en) * | 2016-11-21 | 2017-01-25 | 京东方科技集团股份有限公司 | Shutdown discharging circuit and method, display module and display device |
| CN107193168A (en) * | 2017-07-17 | 2017-09-22 | 深圳市华星光电半导体显示技术有限公司 | A kind of array base palte and display panel |
| CN107516503A (en) * | 2017-10-12 | 2017-12-26 | 深圳市华星光电技术有限公司 | Liquid crystal panel drive circuit and liquid crystal panel drive method |
| CN107633832A (en) * | 2017-10-25 | 2018-01-26 | 南京中电熊猫平板显示科技有限公司 | Liquid crystal display device and its driving method |
| CN108962170A (en) * | 2018-07-26 | 2018-12-07 | 京东方科技集团股份有限公司 | Shut down discharge circuit, display base plate and shutdown charging method |
| CN109671413A (en) * | 2019-02-26 | 2019-04-23 | 合肥京东方显示技术有限公司 | Booster circuit and shutdown circuit and their driving method and display device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| WO2022226681A1 (en) * | 2021-04-25 | 2022-11-03 | 京东方科技集团股份有限公司 | Display apparatus and control method therefor |
| CN115331598A (en) * | 2022-08-25 | 2022-11-11 | 信利(仁寿)高端显示科技有限公司 | Test board and test method for actual charging rate of display panel |
| CN115331598B (en) * | 2022-08-25 | 2024-12-17 | 信利(仁寿)高端显示科技有限公司 | Display panel actual charging rate test board and test method |
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Application publication date: 20200417 |