CN107516503B - Liquid crystal panel driving circuit and liquid crystal panel driving method - Google Patents
Liquid crystal panel driving circuit and liquid crystal panel driving method Download PDFInfo
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- CN107516503B CN107516503B CN201710949427.XA CN201710949427A CN107516503B CN 107516503 B CN107516503 B CN 107516503B CN 201710949427 A CN201710949427 A CN 201710949427A CN 107516503 B CN107516503 B CN 107516503B
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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 invention provides an liquid crystal panel driving circuit and a liquid crystal panel driving method, wherein the liquid crystal panel driving circuit comprises a level conversion unit, a power supply unit, a voltage division unit, a second voltage division unit, a capacitor and a switch module, when in normal work, the power supply unit outputs working voltage to the voltage division unit and the switch unit, the working voltage is divided by the voltage division unit to supply power to the level conversion unit, the level conversion unit performs level conversion on input ground terminal voltage and outputs low-potential output ground terminal voltage, the switch module electrically connects a capacitor second end with a ground end to eliminate ripple of the output ground terminal voltage, when in shutdown, the power supply unit outputs shutdown voltage to the voltage division unit and the switch module, the switch module disconnects the capacitor second end from the ground end, and the level conversion unit pulls the output ground terminal voltage to a constant-voltage high voltage to output to the liquid crystal panel, thereby effectively improving shutdown afterimage of the liquid crystal panel.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to an liquid crystal panel driving circuit and a liquid crystal panel driving method.
Background
Liquid Crystal Displays (LCDs) have many advantages such as thin body, power saving, and no radiation, and have gained widespread applications, such as Liquid Crystal televisions, mobile phones, Personal Digital Assistants (PDAs), digital cameras, computer screens, or notebook computer screens, and are dominant in the field of flat panel displays.
In the active liquid crystal display device, Thin Film Transistors (TFTs) are electrically connected to each pixel, the Gate (Gate) of the TFT is connected to a horizontal scanning line, the Source (Source) is connected to a vertical data line, and the Drain (Drain) is connected to a pixel electrode.
With the continuous development of the manufacturing technology of the liquid crystal display device industry, the technology of directly manufacturing the Gate scan driving circuit on the thin film transistor Array substrate (GOA) by using the Array process instead of the external Gate scan driving IC and the like becomes a hot point content of development of many liquid crystal panel manufacturers, so as to further reduce the production cost .
Referring to fig. 1, the circuit diagram of the conventional lcd panel driving circuit includes a level shifting unit 100 ', a power supply unit 200', a th resistor R10, a second resistor R20, a 0 th capacitor C10, and a second capacitor C20, wherein the input terminal 1 of the level shifting unit 100 'is connected to the input ground voltage VSS _ I, the second input terminal is electrically connected to the second terminal of a 2 th resistor R10, the output terminal is electrically connected to the lcd panel 300', the output terminal of the power supply unit 200 'is electrically connected to the 4 terminal of a 3 th resistor R10, the second terminal of a 5 th resistor R10 is electrically connected to the 20 th terminal of a second resistor R20, the second terminal of the second resistor R20 is grounded, the 20 th terminal of the 20 th capacitor C20 is electrically connected to the output terminal of the level shifting unit 100', the second terminal is grounded, the output voltage level of the power supply voltage when the input voltage of the power supply unit 100 'is converted to the power supply voltage level of the power supply unit 100, the power supply unit 100' is reduced, and the power supply voltage is reduced to the power supply level of the power supply voltage when the power supply voltage is switched from the power supply unit 100 'off, the power supply unit 100' 100 is switched from the power supply unit 100's output level of the power supply unit 100 to the power supply unit 100' is switched from the power supply unit 100, the power supply voltage, the power supply unit 100's 0 is switched from the power supply unit 100's power supply unit 100, the power supply unit 100's power supply unit 100 is switched from the power supply unit 100's power supply voltage is switched from the power supply voltage, the power supply unit 100 to the power supply unit 100's power supply unit is switched from the power supply unit 100 to the power supply unit 100's normal power supply unit 100's power supply unit 100, the power supply unit is switched from the power supply unit 100, the power supply unit is switched off, the power supply unit is switched from the power supply unit 100 to the power supply unit 100, the power supply unit 100's power supply unit is switched from the power supply unit 100's power supply unit is switched off, the power supply unit 100's power supply unit.
Disclosure of Invention
The invention aims to provide an liquid crystal panel driving circuit which can effectively improve shutdown afterimage of a liquid crystal panel.
Another object of of the present invention is to provide methods for driving a liquid crystal panel, which can effectively improve the image sticking caused by power-off of the liquid crystal panel.
In order to achieve the above object, the present invention first provides an liquid crystal panel driving circuit, which includes a level converting unit, a power supplying unit, a voltage dividing unit, a second voltage dividing unit, a 0 capacitor, and a switch module, wherein a input terminal of the level converting unit is connected to an input ground terminal voltage, an output terminal of the level converting unit is electrically connected to a liquid crystal panel, a second input terminal of the level converting unit is electrically connected to a second terminal of the voltage dividing unit, an output terminal of the power supplying unit is electrically connected to a terminal of the voltage dividing unit, a second terminal of the voltage dividing unit is electrically connected to a terminal of the second voltage dividing unit, a second terminal of the second voltage dividing unit is connected to the ground terminal, a terminal of the capacitor is electrically connected to the output terminal of the level converting unit, and a second terminal of the level converting unit is electrically connected to the switch module;
the power supply unit is used for outputting working voltage or shutdown voltage, the switch module receives the working voltage and electrically connects the second end of the th capacitor with the grounding end when the power supply unit outputs the working voltage, and the switch module receives the shutdown voltage and disconnects the second end of the th capacitor from the grounding end when the power supply unit outputs the shutdown voltage;
the level conversion unit is used for performing level conversion on the voltage of the input ground end when the power supply unit outputs working voltage, outputting the voltage of the low-potential output ground end to the liquid crystal panel, and raising the voltage of the output ground end output to the liquid crystal panel to a constant-voltage high voltage when the power supply unit outputs shutdown voltage.
The switch module comprises a third voltage division unit, a fourth voltage division unit and an N-type switch unit;
the th end of the third voltage division unit is electrically connected with the output end of the power supply unit, the second end of the third voltage division unit is electrically connected with the th end of the fourth voltage division unit, the second end of the fourth voltage division unit is connected with the ground end, the control end of the N-type switch unit is electrically connected with the second end of the third voltage division unit, the th end is connected with the ground end, and the second end of the N-type switch unit is electrically connected with the second end of the th capacitor.
When the power supply unit outputs a shutdown voltage, the second end of the third voltage division unit is at a low potential, the N-type switch unit is turned off, and the second end of the th capacitor is disconnected from the ground terminal.
The th end of the second capacitor is electrically connected with the output end of the level conversion unit, and the second end of the second capacitor is electrically connected with the switch module;
when the power supply unit outputs the working voltage, the switch module receives the working voltage and electrically connects the second end of the second capacitor with the grounding end; when the power supply unit outputs a shutdown voltage, the switch module receives the shutdown voltage to disconnect the second end of the second capacitor from the ground terminal.
The switch module further comprises a second N-type switch unit, wherein a control end of the second N-type switch unit is electrically connected with a second end of the third voltage division unit, a th end is connected to a ground end, and the second end is electrically connected with a second end of the second capacitor.
When the power supply unit outputs the working voltage, the second end of the third voltage division unit is at a high potential, the second N-type switch unit is conducted, and the second end of the second capacitor is electrically connected with the grounding end; when the power supply unit outputs shutdown voltage, the second end of the third voltage division unit is at a low potential, the second N-type switch unit is cut off, and the second end of the second capacitor is disconnected with the ground terminal.
The voltage dividing unit, the second voltage dividing unit, the third voltage dividing unit and the fourth voltage dividing unit are respectively a resistor, a second resistor, a third resistor and a fourth resistor;
the N-type switch unit is a N-type FET, the gate of the N-type FET is the control end of the N-type switch unit, the source is the end of the N-type switch unit, and the drain is the second end of the N-type switch unit.
The second N-type switch unit is a second N-type field effect transistor, a gate of the second N-type field effect transistor is a control end of the second N-type switch unit, a source of the second N-type switch unit is an th end of the second N-type switch unit, and a drain of the second N-type switch unit is a second end of the second N-type switch unit.
The voltage value of the working voltage is 10.8-13V;
the voltage value of the shutdown voltage is less than 10V.
The invention also provides liquid crystal panel driving methods, which are applied to the liquid crystal panel driving circuit and comprise the following steps:
step S1, the power supply unit outputs working voltage, the switch module receives the working voltage to electrically connect the second end of the th capacitor with the ground terminal, the working voltage is divided by the th voltage dividing unit and then output to the level conversion unit, the level conversion unit performs level conversion on the voltage of the input ground terminal, and outputs low-potential output ground terminal voltage to the liquid crystal panel;
step S2, the power supply unit outputs a shutdown voltage, the switch module receives the shutdown voltage to disconnect the second terminal of the th capacitor from the ground terminal, the working voltage is divided by the th voltage dividing unit and then output to the level converting unit, and the voltage of the output ground terminal output by the level converting unit to the liquid crystal panel is increased to a constant voltage high voltage.
The liquid crystal panel driving circuit provided by the invention has the beneficial effects that the liquid crystal panel driving circuit comprises a level conversion unit, a power supply unit, a voltage division unit, a second voltage division unit, a capacitor and a switch module, wherein during normal work, the power supply unit outputs working voltage to the voltage division unit and the switch module, the power supply unit supplies power to the level conversion unit after voltage division by the voltage division unit, the level conversion unit performs level conversion on input grounding end voltage and outputs low-potential output grounding end voltage, the switch module electrically connects the second end of the capacitor with a grounding end to eliminate ripples of the output grounding end voltage, during shutdown, the power supply unit outputs shutdown voltage to the voltage division unit and the switch module, the switch module disconnects the second end of the capacitor from the grounding end, and the level conversion unit increases the output grounding end voltage to a constant-voltage and outputs the constant-voltage to a liquid crystal panel, so that shutdown ghosts of the liquid crystal panel are effectively improved.
Drawings
For a further understanding of the nature and technical content of the present invention , reference should be made to the following detailed description of the invention and accompanying drawings which are provided for purposes of illustration and description only and are not intended to be limiting.
In the drawings, there is shown in the drawings,
fig. 1 is a circuit diagram of a conventional liquid crystal panel driving circuit;
FIG. 2 is a circuit diagram of a liquid crystal panel driving circuit according to the present invention;
FIG. 3 is a flow chart of a driving method of a liquid crystal panel according to the present invention.
Detailed Description
To further explain the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 2, the present invention provides an lcd panel driving circuit, including a level shifter 100, a power supply 200, a th voltage divider 300, a second voltage divider 400, a th capacitor C1, a level shifter 100, a power supply 200, a th voltage divider 300, a second voltage divider 400, a th capacitor C1, and a switch module 500;
the th input end of the level conversion unit 100 is connected to an input ground terminal voltage VSS _ I, the output end is electrically connected to the liquid crystal panel 10, the second input end is electrically connected to the second end of the th voltage division unit 300, the output end of the power supply unit 200 is electrically connected to the th end of the th voltage division unit 300, the second end of the th voltage division unit 300 is electrically connected to the th end of the second voltage division unit 400, the second end of the second voltage division unit 400 is connected to the ground terminal, the th end of the th capacitor C1 is electrically connected to the output end of the level conversion unit 100, the second end is electrically connected to the switch module 500, and the switch module 500 is electrically connected to the output end of the power supply unit 200 and is;
the power supply unit 200 is used for outputting working voltage or shutdown voltage, when the power supply unit 200 outputs the working voltage, the switch module 500 receives the working voltage to electrically connect the second end of the th capacitor C1 with the ground terminal, and when the power supply unit 200 outputs the shutdown voltage, the switch module 500 receives the shutdown voltage to disconnect the second end of the th capacitor C1 with the ground terminal;
the level shifter 100 is configured to perform level shifting on the input ground terminal voltage VSS _ I when the power supply unit 200 outputs the working voltage, output a low-potential output ground terminal voltage VSS _ O to the liquid crystal panel 10, and pull up the output ground terminal voltage VSS _ O output to the liquid crystal panel 10 to a constant-voltage high voltage when the power supply unit 200 outputs the shutdown voltage.
Specifically, the switch module 500 includes a third voltage division unit 510, a fourth voltage division unit 520, and an N-type switch unit 530;
the th terminal of the third voltage dividing unit 510 is electrically connected to the output terminal of the power supply unit 200, the second terminal is electrically connected to the th terminal of the fourth voltage dividing unit 520, the second terminal of the fourth voltage dividing unit 520 is connected to the ground terminal, the N-type switch unit 530 has a control terminal electrically connected to the second terminal of the third voltage dividing unit 510, the th terminal is connected to the ground terminal, and the second terminal is electrically connected to the second terminal of the th capacitor C1.
Specifically, when the power supply unit 200 outputs the operating voltage, the second terminal of the third voltage divider 510 is at a high voltage level, the N-type switch unit 530 is turned on, and the second terminal of the C1 is electrically connected to the ground, and when the power supply unit 200 outputs the shutdown voltage, the second terminal of the third voltage divider 510 is at a low voltage level, the N-type switch unit 530 is turned off, and the second terminal of the C1 is disconnected from the ground.
It should be noted that the operation of the liquid crystal panel driving circuit of the present invention is as follows:
firstly, in a normal state, the power supply unit 200 inputs a working voltage to the th end of the th voltage dividing unit 300, the working voltage is divided by the th voltage dividing unit 300 and then is output to the level converting unit 100 to supply power to the level converting unit 100 so as to enable the level converting unit 100 to normally work, the level converting unit 100 performs level conversion on an input ground terminal voltage VSS _ I and outputs a low-level output ground terminal voltage VSS _ O to the liquid crystal panel 10, meanwhile, the power supply unit 200 also outputs the working voltage to the switch module 500, the working voltage is divided by the third voltage dividing unit 510 so as to enable the second end of the third voltage dividing unit 510 to be a high level, so that the N-type switch unit 530 is turned on, and the second end of the C1 is grounded, so that the C1 eliminates ripples of the output ground terminal voltage VSS _ O output by the output end of the level converting unit 100, the output ground terminal voltage VSS _ O with ripples eliminated is input to the liquid crystal panel 10, and the output ground terminal voltage VSS _ O input to the liquid;
then, when the power supply unit 200 inputs a shutdown voltage to the th end of the th voltage dividing unit 300, the shutdown voltage is smaller than the working voltage, the shutdown voltage is divided by the th voltage dividing unit 300 and then input to the level converting unit 100, at this time, the level converting unit 100 raises the output ground terminal voltage VSS _ O output to the liquid crystal panel 10 to a constant voltage high voltage, meanwhile, the power supply unit 200 also outputs a shutdown voltage to the switching unit 500, after the shutdown voltage is divided by the third voltage dividing unit 510, the second end of the third voltage dividing unit 510 is at a low potential, so that the N-type switching unit 530 is turned off, the second end of the capacitor C1 is disconnected from the ground terminal to be empty, it is ensured that the output ground terminal voltage VSS _ O input to the liquid crystal panel 10 is at the constant voltage high potential, so that the TFT in the liquid crystal panel 10 is completely turned on, and shutdown ghost can be effectively eliminated.
Specifically, the voltage divider 300, the second voltage divider 400, the third voltage divider 510, and the fourth voltage divider 520 are respectively a resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the N-type switch unit 530 is a N-type FET Q1, the gate of the N-type FET Q1 is the control terminal of the N-type switch unit 530, the source is the terminal of the N-type switch unit 530, and the drain is the second terminal of the N-type switch unit 530.
, in order to enhance the ability of the lcd panel driving circuit to eliminate the ripple of the output ground terminal voltage VSS _ O, the lcd panel driving circuit further includes a second capacitor C2, a th terminal of the second capacitor C2 is electrically connected to the output terminal of the level shifter 100, and a second terminal is electrically connected to the switch module 500;
when the power supply unit 200 outputs the shutdown voltage, the switch module 500 receives the shutdown voltage to disconnect the second end of the second capacitor C2 from the ground terminal, so as to ensure that the output ground terminal voltage VSS _ O input to the liquid crystal panel 10 is a constant-voltage high potential, so that the TFTs in the liquid crystal panel 10 are completely turned on, and the shutdown ghost can be effectively eliminated.
Specifically, the switch module 500 further includes a second N-type switch unit 540, wherein a control terminal of the second N-type switch unit 540 is electrically connected to a second terminal of the third voltage division unit 510, a terminal is connected to a ground terminal, and the second terminal is electrically connected to a second terminal of the second capacitor C2.
Specifically, when the power supply unit 200 outputs the working voltage, the second terminal of the third voltage division unit 510 is at a high potential, the second N-type switch unit 540 is turned on, and the second terminal of the second capacitor C2 is electrically connected to the ground terminal; when the power supply unit 200 outputs the shutdown voltage, the second terminal of the third voltage division unit 510 is at a low voltage level, the second N-type switch unit 540 is turned off, and the second terminal of the second capacitor C2 is disconnected from the ground terminal.
Specifically, the second N-type switch unit 540 is a second N-type fet Q2, the gate of the second N-type fet Q2 is the control terminal of the second N-type switch unit 540, the source is the terminal of the second N-type switch unit 540, and the drain is the second terminal of the second N-type switch unit 540.
Preferably, the voltage value of the working voltage is 10.8-13V; the voltage value of the shutdown voltage is less than 10V.
Referring to fig. 3 in combination with fig. 2, based on the same concept of , the present invention further provides a liquid crystal panel driving method applied to the liquid crystal panel driving circuit, including the following steps:
step S1, entering a normal working state, the power supply unit 200 outputs a working voltage, the switch module 500 receives the working voltage to electrically connect the second terminal of the th capacitor C1 with the ground terminal, the working voltage is divided by the th voltage dividing unit 300 and then output to the level converting unit 100, the level converting unit 100 performs level conversion on the input ground terminal voltage VSS _ I, and outputs a low-potential output ground terminal voltage VSS _ O to the liquid crystal panel 10.
Specifically, in a normal state, the power supply unit 200 inputs a working voltage to the th end of the th voltage dividing unit 300, the working voltage is divided by the th voltage dividing unit 300 and then is output to the level converting unit 100 to supply power to the level converting unit 100 so as to enable the level converting unit 100 to normally work, the level converting unit 100 performs level conversion on the input ground terminal voltage VSS _ I and outputs a low-level output ground terminal voltage VSS _ O to the liquid crystal panel 10, meanwhile, the power supply unit 200 also outputs the working voltage to the switch module 500, the working voltage is divided by the third voltage dividing unit 510 so as to enable the second end of the third voltage dividing unit 510 to be a high-level voltage, so that the N-type switch unit 530 is turned on, and the second end of the C1 is grounded, so that the C1 eliminates ripples of the output ground terminal voltage VSS _ O output by the level converting unit 100, the output ground terminal voltage VSS _ O with ripples eliminated is input to the liquid crystal panel 10, and it is ensured that the output ground terminal voltage VSS _ O input to the.
, when the liquid crystal panel driving circuit further includes a second capacitor C2 and the switch module 500 further includes a second N-type switch unit 540, in the step S1, the switch module 500 further electrically connects the second terminal of the second capacitor C2 to the ground, specifically, the second terminal of the third voltage division unit 510 is at a high potential, so that the second N-type switch unit 540 is turned on, and the second terminal of the second capacitor C2 is electrically connected to the ground, that is, the second capacitor C2 and the capacitor C1 are both terminals connected to the output terminal of the level shift unit 100, and the terminal is grounded, so as to enhance the capability of the liquid crystal panel driving circuit to eliminate the ripple of the output ground terminal voltage VSS _ O.
Step S2, entering a shutdown state, the power supply unit 200 outputs a shutdown voltage, the switch module 500 receives the shutdown voltage to disconnect the second terminal of the th capacitor C1 from the ground, the working voltage is divided by the th voltage dividing unit 300 and then output to the level converting unit 100, and the level converting unit 100 boosts the output ground terminal voltage VSS _ O output to the liquid crystal panel 10 to a constant high voltage.
Specifically, when the power supply unit 200 inputs the shutdown voltage to the th end of the th voltage dividing unit 300, the shutdown voltage is divided by the th voltage dividing unit 300 and then input to the level converting unit 100, at this time, the level converting unit 100 raises the output ground terminal voltage VSS _ O output to the liquid crystal panel 10 to the constant voltage high voltage, meanwhile, the power supply unit 200 also outputs the shutdown voltage to the switch unit 500, after the shutdown voltage is divided by the third voltage dividing unit 510, the second end of the third voltage dividing unit 510 is at the low potential, so that the N-type switch unit 530 is turned off, the second end of the capacitor C1 is disconnected from the ground terminal and is left empty, the output ground terminal voltage VSS _ O input to the liquid crystal panel 10 is ensured to be at the constant voltage high potential, so that the TFT in the liquid crystal panel 10 is completely turned on, and the shutdown ghost can be effectively eliminated.
, when the liquid crystal panel driving circuit further includes a second capacitor C2 and the switch module 500 further includes a second N-type switch unit 540, in step S2, the switch module 500 further disconnects the second terminal of the second capacitor C2 from the ground, specifically, the second terminal of the third voltage division unit 510 is at a low potential to turn off the second N-type switch unit 540 and disconnect the second terminal of the second capacitor C2 from the ground, so as to ensure that the voltage VSS _ O input to the output ground of the liquid crystal panel 10 is at a high constant voltage potential to turn on the TFT of the liquid crystal panel 10 completely, thereby effectively eliminating the shutdown ghost.
In summary, the liquid crystal panel driving circuit of the present invention includes a level converting unit, a power supplying unit, an th voltage dividing unit, a second voltage dividing unit, a th capacitor, and a switch module, wherein during normal operation, the power supplying unit outputs a working voltage to the th voltage dividing unit and the switch module, and supplies power to the level converting unit after voltage division by the th voltage dividing unit, the level converting unit performs level conversion on an input ground terminal voltage and outputs a low-level output ground terminal voltage, the switch module electrically connects a second terminal of the th capacitor to a ground terminal, so as to eliminate ripples of the output ground terminal voltage, during shutdown, the power supplying unit outputs a shutdown voltage to the th voltage dividing unit and the switch module, the switch module disconnects the second terminal of the th capacitor from the ground terminal, and the level converting unit pulls the output ground terminal voltage to a constant-voltage and outputs the high-voltage to the liquid crystal panel, thereby effectively improving shutdown ghost of the liquid crystal panel.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (10)
- The liquid crystal panel driving circuit comprises a level conversion unit (100) and a power supply unit (200), and is characterized by further comprising a th voltage division unit (300), a second voltage division unit (400), a 0 th capacitor (C1) and a switch module (500), wherein the th input end of the level conversion unit (100) is connected with an input ground end voltage (VSS _ I), the output end of the level conversion unit (100) is electrically connected with a liquid crystal panel (10), the second input end of the level conversion unit is electrically connected with the second end of the th voltage division unit (300), the output end of the power supply unit (200) is electrically connected with the th end of the th voltage division unit (300), the second end of the th voltage division unit (300) is electrically connected with the th end of the second voltage division unit (400), the second end of the second voltage division unit (400) is connected with the ground end, the th end of the th capacitor (C1) is electrically connected with the output end of the level conversion unit (100), and the second end of the power supply unit (500) is electrically connected with the ground end of the;the power supply unit (200) is used for outputting working voltage or shutdown voltage, when the power supply unit (200) outputs the working voltage, the switch module (500) receives the working voltage and electrically connects the second end of the th capacitor (C1) with the ground terminal, and when the power supply unit (200) outputs the shutdown voltage, the switch module (500) receives the shutdown voltage and disconnects the second end of the th capacitor (C1) from the ground terminal;the level conversion unit (100) is used for performing level conversion on an input ground end voltage (VSS _ I) when the power supply unit (200) outputs a working voltage, outputting a low-potential output ground end voltage (VSS _ O) to the liquid crystal panel (10), and raising the output ground end voltage (VSS _ O) output to the liquid crystal panel (10) to a constant-voltage high voltage when the power supply unit (200) outputs a shutdown voltage.
- 2. The liquid crystal panel driving circuit of claim 1, wherein the switching module (500) comprises a third voltage division unit (510), a fourth voltage division unit (520), and an N-type switching unit (530);the th end of the third voltage division unit (510) is electrically connected with the output end of the power supply unit (200), the second end of the third voltage division unit is electrically connected with the th end of the fourth voltage division unit (520), the second end of the fourth voltage division unit (520) is connected to the ground terminal, the control end of the N-type switch unit (530) is electrically connected with the second end of the third voltage division unit (510), the th end is connected to the ground terminal, and the second end of the 3925N-type switch unit is electrically connected with the second end of the capacitor (C1).
- 3. The driving circuit of claim 2, wherein when the power supply unit (200) outputs the operating voltage, the second terminal of the third voltage divider unit (510) is at a high voltage level, the N-type switch unit (530) is turned on, and the second terminal of the th capacitor (C1) is electrically connected to the ground, and when the power supply unit (200) outputs the shutdown voltage, the second terminal of the third voltage divider unit (510) is at a low voltage level, the N-type switch unit (530) is turned off, and the second terminal of the th capacitor (C1) is disconnected from the ground.
- 4. The liquid crystal panel driving circuit as claimed in claim 2, further comprising a second capacitor (C2), wherein a terminal of the second capacitor (C2) is electrically connected to the output terminal of the level shifter unit (100), and a second terminal is electrically connected to the switch module (500);when the power supply unit (200) outputs the working voltage, the switch module (500) receives the working voltage and electrically connects the second end of the second capacitor (C2) with the ground terminal; when the power supply unit (200) outputs a shutdown voltage, the switch module (500) receives the shutdown voltage to disconnect the second end of the second capacitor (C2) from the ground terminal.
- 5. The LCD panel driving circuit of claim 4, wherein the switch module (500) further comprises a second N-type switch unit (540), wherein a control terminal of the second N-type switch unit (540) is electrically connected to a second terminal of the third voltage divider unit (510), a second terminal is connected to a ground terminal, and the second terminal is electrically connected to a second terminal of the second capacitor (C2).
- 6. The driving circuit of claim 5, wherein when the power supply unit (200) outputs the operating voltage, the second terminal of the third voltage division unit (510) is at a high voltage level, the second N-type switch unit (540) is turned on, and the second terminal of the second capacitor (C2) is electrically connected to the ground terminal; when the power supply unit (200) outputs a shutdown voltage, the second terminal of the third voltage division unit (510) is at a low potential, the second N-type switch unit (540) is turned off, and the second terminal of the second capacitor (C2) is disconnected from the ground terminal.
- 7. The liquid crystal panel driving circuit according to claim 2, wherein the th voltage dividing unit (300), the second voltage dividing unit (400), the third voltage dividing unit (510), and the fourth voltage dividing unit (520) are a th resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R4), respectively;the N-type switch unit (530) is a N-type FET (Q1), the gate of the N-type FET (Q1) is the control terminal of the N-type switch unit (530), the source is the terminal of the N-type switch unit (530), and the drain is the second terminal of the N-type switch unit (530).
- 8. The liquid crystal panel driving circuit of claim 5, wherein the second N-type switching unit (540) is a second N-type field effect transistor (Q2), the gate of the second N-type field effect transistor (Q2) is the control terminal of the second N-type switching unit (540), the source is the terminal of the second N-type switching unit (540), and the drain is the second terminal of the second N-type switching unit (540).
- 9. The liquid crystal panel driving circuit according to claim 1, wherein the operating voltage has a voltage value of 10.8 to 13V;the voltage value of the shutdown voltage is less than 10V.
- A liquid crystal panel driving method of , applied to the liquid crystal panel driving circuit of any of claims 1-9 through , comprising the steps of:step S1, the power supply unit (200) outputs a working voltage, the switch module (500) receives the working voltage to electrically connect the second end of the th capacitor (C1) with the ground terminal, the working voltage is divided by the th voltage dividing unit (300) and then output to the level conversion unit (100), the level conversion unit (100) performs level conversion on the input ground terminal voltage (VSS _ I), and outputs a low-potential output ground terminal voltage (VSS _ O) to the liquid crystal panel (10);step S2, the power supply unit (200) outputs a shutdown voltage, the switch module (500) receives the shutdown voltage to disconnect the second terminal of the th capacitor (C1) from the ground terminal, the working voltage is divided by the th voltage dividing unit (300) and then output to the level converting unit (100), and the voltage (VSS _ O) of the output ground terminal output by the level converting unit (100) to the liquid crystal panel (10) is pulled up to a constant voltage high voltage.
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| CN109523968B (en) * | 2018-12-24 | 2021-02-19 | 惠科股份有限公司 | Control circuit and display device |
| CN110010098B (en) * | 2019-04-23 | 2020-10-13 | 深圳市华星光电技术有限公司 | Voltage conversion circuit |
| CN110599977A (en) * | 2019-09-18 | 2019-12-20 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit and display device |
| CN110706672B (en) * | 2019-09-25 | 2021-04-02 | 武汉华星光电半导体显示技术有限公司 | Drive circuit and display panel |
| CN110930958A (en) * | 2019-11-26 | 2020-03-27 | Tcl华星光电技术有限公司 | Shutdown ghost eliminating circuit, array substrate and display device |
| CN111028807A (en) * | 2019-12-24 | 2020-04-17 | Tcl华星光电技术有限公司 | Driving circuit and driving method of liquid crystal display panel |
| CN112185314B (en) * | 2020-10-19 | 2022-04-01 | Tcl华星光电技术有限公司 | Voltage conversion circuit and display device |
| CN114566110A (en) * | 2020-11-27 | 2022-05-31 | 福州京东方光电科技有限公司 | Level conversion circuit, driving circuit of display panel and display device |
| CN113205783B (en) * | 2021-04-25 | 2022-11-25 | 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 |
| TWI799244B (en) * | 2022-04-26 | 2023-04-11 | 友達光電股份有限公司 | Pixel circuit and power supply method for power-off sequence thereof |
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| US8040309B2 (en) * | 2006-01-31 | 2011-10-18 | Chimei Innolux Corproation | Display panel with image sticking elimination circuit and driving circuit with the same |
| JP5366458B2 (en) * | 2007-07-11 | 2013-12-11 | 株式会社半導体エネルギー研究所 | Active matrix display device and electronic device using the same |
| CN101826315B (en) * | 2010-05-06 | 2012-06-27 | 友达光电股份有限公司 | Liquid crystal display device |
| JP2012022160A (en) * | 2010-07-15 | 2012-02-02 | Sharp Corp | Liquid crystal display device and display control method |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |