CN102867491B - LCD (Liquid Crystal Display) panel drive circuit and method as well as display unit - Google Patents
LCD (Liquid Crystal Display) panel drive circuit and method as well as display unit Download PDFInfo
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- CN102867491B CN102867491B CN201210321948.8A CN201210321948A CN102867491B CN 102867491 B CN102867491 B CN 102867491B CN 201210321948 A CN201210321948 A CN 201210321948A CN 102867491 B CN102867491 B CN 102867491B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000007599 discharging Methods 0.000 claims description 11
- 239000010409 thin film Substances 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 abstract description 4
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- 238000010586 diagram Methods 0.000 description 8
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Abstract
The invention provides an LCD (Liquid Crystal Display) panel drive circuit and method as well as a display unit. The LCD panel drive circuit comprises a control unit and a charge release module. The LCD panel drive method comprises the steps that a control signal is generated by the control unit when the LCD panel is shut down and output to the charge release module; and the charge release module leads residual charge on a pixel electrode and a public electrode to a ground terminal according to the control signal. According to the LCD panel drive circuit and method as well as the display unit provided by the invention, charge on the pixel electrode and the public electrode is led to the ground terminal when the LCD panel is shut down, so that no residual charge is left in the whole panel, the occurrence of abnormal pictures in shutdown is eliminated, the polarized probability of liquid crystals is reduced simultaneously, and the service life of the LCD panel is prolonged.
Description
Technical Field
The invention relates to the technical field of flat panel display, in particular to a liquid crystal display panel driving circuit, a liquid crystal display panel driving method and a display device.
Background
In recent years, Thin Film Transistor liquid crystal Display (TFT-LCD) has gradually replaced crt (cathode Ray tube) Display, and has become the mainstream of new generation Display. As LCDs are widely used in electronic products such as notebook computers, mobile phones, televisions and the like which are closely related to life, people have higher and higher requirements for image quality, and thus, improvement of image quality is always a target continuously pursued in related fields.
Specifically, when the power supply (VDD) of the tft-lcd is turned off, charges are accumulated in the liquid crystal capacitor between the two opposite electrodes after the display displays an image for a long time due to the charging relationship, and the accumulated charges cannot be released immediately after the power supply is turned off, so that a part of the previous image still remains on the instantaneous screen. Obviously, if no additional control circuit is used to affect the display, the LCD can only gradually reach the purpose of pixel potential discharge through the leakage current of the thin film transistor corresponding to each pixel, which causes the occurrence of the shutdown afterimage to be more persistent.
As shown in fig. 1, which is a schematic structural diagram of a driving circuit of a liquid crystal panel in the prior art, the driving circuit of the liquid crystal panel includes a pixel region 500 including a data line 510, a gate line 520, a common electrode (VCOM), a TFT at an intersection of the gate line 520 and the data line 510, a gate of the TFT being electrically connected to the gate line 520, a source of the TFT being electrically connected to the data line 510, and a drain of the TFT being connected to the pixel electrode; a data voltage generating module 100 for supplying a data voltage to the data line 510 of the pixel region 500; the gate voltage generating module 200 is configured to provide a gate voltage to the gate line 520 of the pixel area 500, and an XON function circuit is usually disposed in the gate voltage generating module 200, where the XON function means that, when the VDD of the liquid crystal panel is powered down to a certain extent, and an XON pin of the gate voltage generating module 200 receives a shutdown signal of the panel, the gate voltage generating module 200 outputs a VGH signal to turn on gates of all TFTs in the display panel, so as to eliminate image anomalies and residual images during startup when shutdown occurs, but the shutdown time is required to be long, charge remains on a pixel capacitor all the time, and the anomalies or residual images can still be seen when the display panel is started immediately after shutdown.
For the normally white mode lcd panel, the general data voltage generating module 100 outputs the voltage of the white frame (about 0.5V); for a normally black mode liquid crystal panel, the data voltage generating module 100 outputs a black frame voltage (about 0.4V), so that all pixels are at the same voltage level, the voltage is about a few tenths of volts, the voltage of the common electrode is still the voltage during design, which is about 5-7V, then the VGH voltage drops to 0V, the charges on the pixels can only slowly leak and disappear, the charges on the common electrode also lose power slowly, which is generally more than 50ms, and the voltage difference between two ends of the liquid crystal is always the voltage difference of the same polarity, if the voltage difference exceeds the threshold voltage of the liquid crystal and is kept for a long time, the liquid crystal is polarized, the display performance of the liquid crystal is damaged, and the service life of the LCD is affected.
Disclosure of Invention
The invention provides a liquid crystal panel driving circuit, a liquid crystal panel driving method and a display device, which are used for solving the problems that residual charges on a pixel capacitor cannot be quickly released when the display device is shut down, so that liquid crystals are polarized, the display performance of the liquid crystals is damaged, and the service life of the liquid crystals is influenced.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
a liquid crystal panel driving circuit comprising:
the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off;
and the charge releasing module guides residual charges on the pixel electrode and the common electrode into a ground terminal according to a control signal output by the control device.
Preferably, the control device includes a gate voltage generating module and a control voltage module, where an input end of the control voltage module is connected to the gate voltage generating module, and an output end of the control voltage module is connected to the charge releasing module, and is configured to receive a signal generated by the gate voltage generating module when the electronic device is turned off, and generate a driving voltage according to the signal and provide the driving voltage to the charge releasing module.
Specifically, the control voltage module includes an operational amplifier and a nand gate, an input end of the operational amplifier receives an XON signal, an output end of the operational amplifier is connected with an input end of the nand gate, another input end of the nand gate receives a high voltage signal VGH generated by the gate voltage generation module, and an output end of the nand gate outputs a driving voltage signal VOUT.
Preferably, the charge discharging module includes a plurality of switching units, and the charge discharging module includes a plurality of switching units, each of which is connected to one end of the data line or the common electrode line.
Specifically, each switch unit comprises a thin film transistor, the grid electrode of the thin film transistor is connected with the control voltage module, the source electrode of the thin film transistor is connected with the data line or the common electrode line, and the drain electrode of the thin film transistor is grounded.
A method for driving a liquid crystal panel driving circuit includes:
the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off;
the charge releasing module guides residual charges on the pixel electrode and the common electrode to a ground terminal according to the control signal.
Preferably, the control device includes a gate voltage generation module and a control voltage module, and the control device generates a control signal when the power supply is turned off and outputs the control signal to the charge release module specifically includes:
the grid voltage generating module outputs a voltage signal to the control voltage module when the power supply is turned off;
the control voltage module generates a driving voltage according to the voltage signal and provides the driving voltage for the charge releasing module.
Specifically, the gate voltage generating module outputs voltage signals as high voltage signals VGH and XON signals, and the control voltage module receives the high voltage signals VGH generated by the gate voltage generating module and the XON signal generated by the XON function circuit and outputs a driving voltage signal VOUT.
Preferably, the charge discharging module includes a plurality of switch units, and the plurality of switch units are turned on according to the driving voltage signal VOUT output by the control voltage module to introduce the residual charges on the pixel electrode and the common electrode to the ground terminal.
The invention also provides a display device comprising the liquid crystal panel driving circuit.
The embodiment provided by the invention has the following beneficial effects:
by adding a control device and a charge releasing module, the charges on the pixel electrode and the common electrode can be led into the grounding terminal when the liquid crystal panel is shut down, so that the whole panel has no charge residue, abnormal pictures generated when the liquid crystal panel is shut down are eliminated, the probability of polarization of liquid crystals can be reduced, and the service life of the liquid crystal panel is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a driving circuit of a liquid crystal display panel according to the prior art;
FIG. 2 is a schematic diagram of a liquid crystal display panel driving circuit according to the present invention;
FIG. 3 is a circuit diagram of a charge discharging module according to the present invention;
FIG. 4 is a circuit diagram of a control voltage module according to the present invention;
FIG. 5 is a flowchart illustrating a method for driving a liquid crystal panel according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a liquid crystal panel driving circuit, comprising: the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off; and the charge releasing module guides residual charges on the pixel electrode and the common electrode into a ground terminal according to a control signal output by the control device.
The control device may be a manual button or a trigger device disposed on the liquid crystal panel, and generates a control signal to the charge releasing module through manual control or triggering when the device is turned off.
Preferably, the control device includes a gate voltage generating module and a control voltage module, an input end of the control voltage module is connected to the gate voltage generating module, and an output end of the control voltage module is connected to the charge releasing module, and is configured to receive a signal generated by the gate voltage generating module when the electronic device is turned off, and generate a driving voltage according to the signal and provide the driving voltage to the charge releasing module.
As shown in fig. 2, which is a schematic structural diagram of a liquid crystal panel driving circuit according to the present invention, the liquid crystal panel driving circuit includes a pixel region 500 including a data line 510, a gate line 520, a common electrode (VCOM), a TFT at a crossing of the gate line 520 and the data line 510, the TFT gate being electrically connected to the gate line 520, the TFT source being electrically connected to the data line 510, and the TFT drain being connected to the pixel electrode; a data voltage generating module 100 for supplying a data voltage to the data line 510 of the pixel region 500; a gate voltage generating module 200 for supplying a gate voltage to the gate line 520 of the pixel region 500; a control voltage module 300, an input end of which is connected to the gate voltage generating module 200 and an output end of which is connected to the charge releasing module 400, for receiving the signal generated by the gate voltage generating module when the power supply is turned off, and generating a driving voltage according to the signal to supply to the charge releasing module; and a charge discharging module 400 for guiding the residual charges on the pixel electrode and the common electrode to the ground terminal under the action of the driving voltage.
As shown in fig. 3, which is a schematic circuit diagram of the charge discharging module according to the present invention, the charge discharging module 400 includes a plurality of switch units, each of which is connected to one end of the data line 510 or the VCOM line.
Specifically, each switch unit is a TFT switch, the gate of which is connected to the control voltage module 200, the source of which is connected to the data line 510 or the VCOM line, and the drain of which is connected to the GND terminal.
As shown in fig. 4, which is a schematic circuit diagram of the control voltage module of the present invention, the control voltage module 300 includes an operational amplifier 301 and a nand gate 302, the operational amplifier 301 has two input terminals, a non-inverting input terminal and an inverting input terminal, and an output terminal, the operational amplifier 301 used in the present invention is a homodromous proportional circuit, the non-inverting input terminal of the operational amplifier 301 is connected to an input voltage, the inverting input terminal is grounded, a signal at the output terminal is proportional to a voltage of a signal at the non-inverting input terminal, and the proportion can be set as required; nand gate 302 is a combination of and not gates, having two inputs and one output, and performs an and operation first and then a not operation.
The XON control signal is generated by the XON function circuit, when the liquid crystal panel normally works, the XON signal is at a high level, the voltage value of the XON signal is similar to VCC (3.3V), when VDD of the liquid crystal panel is powered down to a certain degree, the XON signal changes from the high level to a low level, the input end of the operational amplifier 301 receives the panel shutdown signal XON, and the output end outputs the amplified signal XONN.
The non-inverting output terminal of the operational amplifier 301 is connected to one input terminal of the nand gate 302, the other input terminal of the nand gate 302 is connected to the gate voltage generation module 200, and always receives the high voltage signal VGH generated by the gate voltage generation module 200, the VGH signal is the TFT gate turn-on voltage, and the output terminal outputs the driving voltage signal VOUT.
When the liquid crystal panel normally operates, the voltage value of the VGH signal is large, and the voltage amplitudes of the XON signal and the VGH signal must be the same in order to be compared with each other, so that the XON signal needs to be amplified in a set proportion by the operational amplifier 301. The amplified XONN signal and VGH are both high, the nand output VOUT signal is low, the TFTs at the ends of the data line 510 and the VCOM line are not turned on, and the pixel electrode voltage and the common voltage are normal.
When the liquid crystal panel is shut down, XON changes from high level 3.3V to low level about 0.8V, and after the XON pin of the gate voltage generating module 200 receives a shutdown signal of the panel, the gate voltage generating module 200 outputs a VGH signal to turn on the gates of all TFTs in the display panel. The XONN signal voltage amplified by the operational amplifier is still low level, after the VGH signal and the VONN signal are NAND, the VOUT signal is high level, the gates of the TFTs at the tail ends of the data line 510 and the VCOM line receive the VOUT voltage signal and turn on the TFTs, at the moment, all the TFTs in the display panel are also turned on, the charges on the pixel electrodes are transmitted to the TFT drain at the tail end of the data line 510 through the data line 510, the charges on the common electrode are transmitted to the TFT drain at the tail end of the VCOM line through the VCOM line, and the residual charges on the pixel electrodes and the common electrode are all led into the ground terminal, so that the whole panel has no charge residue, abnormal pictures generated during shutdown are eliminated, meanwhile, the probability of polarization of liquid crystals can be reduced, and the service life of the liquid.
The shutdown state of the liquid crystal panel refers to a state when the liquid crystal panel does not work and no picture is output.
The TFT at the tail end of the data line and the VCOM line can be a P-type or N-type TFT, and when the TFT is of the P-type, the opening of the TFT requires a grid to receive a high-potential signal; when the TFT is of an N type, the opening of the TFT requires that a grid electrode receives a low-potential signal, an inverter is required to be added at an XONN signal input end, and a grid voltage generation module is required at a VGH signal input end to provide a low-voltage signal VGL.
The gate voltage generation module in the embodiment provided by the invention aims to provide a gate signal for a pixel region; it can be formed on the driving circuit of the liquid crystal display by an Array process, i.e. (Gate driver on the Array, GOA). The integration process not only saves cost, but also can realize symmetrical aesthetic design of two sides of the panel, and simultaneously saves a binding (Bonding) area of a grid line integrated circuit and a wiring space of a Fan-out (Fan-out), thereby realizing the design of a narrow frame; moreover, the integration process can also omit the Bonding process in the direction of the gate line, thereby improving the productivity and the yield. Compared with the traditional thin Film Chip integration (COF) and Glass Chip integration (COG) processes, the method saves the cost, and is favorable for improving the productivity because the Bonding process in the direction of the gate line can be omitted.
The invention also provides a method for driving the liquid crystal panel driving circuit, which comprises the following steps: the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off; the charge releasing module guides residual charges on the pixel electrode and the common electrode to a ground terminal according to the control signal.
The control device can generate a control signal to be provided to the charge release module through manual control or triggering when the control device is shut down, preferably, the control device comprises a grid voltage generation module and a control voltage module, the grid voltage generation module outputs a voltage signal to the control voltage module when the control device is shut down, and the control voltage module generates a driving voltage according to the voltage signal and provides the driving voltage to the charge release module.
Specifically, as shown in fig. 5, a flowchart for driving the liquid crystal panel driving circuit according to the present invention includes:
step 501, outputting a voltage signal to a control voltage module by a grid voltage generation module when the grid voltage generation module is shut down;
as an embodiment, the gate voltage generating module is provided with an XON function circuit, when the liquid crystal panel normally operates, the XON signal output by the XON function circuit is a high level signal VCC, when the liquid crystal panel is turned off, the XON signal output by the XON function circuit changes from a high level to a low level, and the gate voltage generating module provides the gate-on voltage signals VGH and XON to the control voltage module.
Step 502, the control voltage module generates a driving voltage VOUT according to the voltage signal and provides the driving voltage VOUT to the charge releasing module;
specifically, the control voltage module receives the high voltage signal VGH and the XON signal generated by the gate voltage generation module to generate a driving voltage VOUT for the charge discharging module.
In step 503, the charge discharging module directs the residual charges on the pixel electrode and the common electrode to the ground terminal according to the driving voltage VOUT.
Specifically, the charge releasing module comprises a plurality of switch units, receives the driving voltage VOUT generated by the control voltage module, and when the liquid crystal panel works normally, the driving voltage VOUT is at a low level, the switch units of the charge releasing module are not turned on, and the pixel electrode voltage and the common electrode voltage are normal values; when the liquid crystal panel is shut down, the driving voltage VOUT is at a high level, the switch units of the charge releasing module are all turned on, and the residual charges on the pixel electrode and the common electrode are led to the ground terminal.
The invention also provides a display device, which comprises a display panel, and the liquid crystal panel driving circuit provided in the embodiment is adopted, so that the display device can quickly release residual charges in a pixel area when being shut down, the problem of abnormal shutdown pictures is solved, the probability of polarization of liquid crystal can be reduced, and the service life of the liquid crystal panel is prolonged.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A liquid crystal panel drive circuit, comprising:
the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off;
the charge releasing module is used for leading residual charges on the pixel electrode and the common electrode into a grounding end according to a control signal output by the control device; wherein,
the control device comprises a grid voltage generation module and a control voltage module, wherein the input end of the control voltage module is connected with the grid voltage generation module, and the output end of the control voltage module is connected with the charge release module, and is used for receiving a signal generated by the grid voltage generation module during shutdown and generating a driving voltage according to the signal to supply the driving voltage to the charge release module; wherein,
the control voltage module comprises an operational amplifier and a NAND gate, the input end of the operational amplifier receives an XON signal, the output end of the operational amplifier is connected with one input end of the NAND gate, the other input end of the NAND gate receives a high-voltage signal VGH generated by the grid voltage generation module, and the output end of the NAND gate outputs a driving voltage signal VOUT.
2. The liquid crystal panel driving circuit of claim 1, wherein the charge discharging module comprises a plurality of switching units, each of which is connected to one end of a data line or a common electrode line.
3. The liquid crystal panel driving circuit of claim 2, wherein each of the switching units comprises a thin film transistor having a gate connected to the control voltage module, a source connected to the data line or the common electrode line, and a drain connected to ground.
4. A method of driving a liquid crystal panel driving circuit, comprising:
the control device generates a control signal and outputs the control signal to the charge release module when the power supply is turned off;
the charge releasing module guides residual charges on the pixel electrode and the common electrode into a grounding terminal according to the control signal; wherein,
the control device comprises a grid voltage generation module and a control voltage module, and the control device generates a control signal when being shut down and outputs the control signal to the charge release module, specifically comprising:
the grid voltage generating module outputs a voltage signal to the control voltage module when the power supply is turned off;
the control voltage module generates a driving voltage according to the voltage signal and provides the driving voltage for the charge releasing module; wherein,
the voltage signal output by the grid voltage generation module is a high voltage VGH signal and an XON signal, and the control voltage module receives the high voltage signal VGH and the XON signal generated by the grid voltage generation module and outputs a driving voltage signal VOUT.
5. The method of claim 4, wherein the charge discharging module comprises a plurality of switch units, and the plurality of switch units are turned on according to the driving voltage signal VOUT output by the control voltage module to guide the residual charges on the pixel electrode and the common electrode to the ground terminal.
6. A display device comprising the liquid crystal panel driving circuit according to any one of claims 1 to 3.
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| CN201210321948.8A CN102867491B (en) | 2012-09-03 | 2012-09-03 | LCD (Liquid Crystal Display) panel drive circuit and method as well as display unit |
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| CN201210321948.8A CN102867491B (en) | 2012-09-03 | 2012-09-03 | LCD (Liquid Crystal Display) panel drive circuit and method as well as display unit |
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| CN115953990A (en) * | 2022-12-28 | 2023-04-11 | 惠科股份有限公司 | Shutdown discharge circuit and display device |
| CN116092443A (en) * | 2022-12-30 | 2023-05-09 | 深圳创维－Rgb电子有限公司 | Display panel, driving method, driving device, apparatus, and storage medium |
| CN115966188A (en) * | 2023-01-06 | 2023-04-14 | 北京奕斯伟计算技术股份有限公司 | Control circuit of liquid crystal panel, liquid crystal display device and control method |
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| JP3231641B2 (en) * | 1996-03-21 | 2001-11-26 | シャープ株式会社 | Liquid crystal display |
| JP3870862B2 (en) * | 2002-07-12 | 2007-01-24 | ソニー株式会社 | Liquid crystal display device, control method thereof, and portable terminal |
| CN1845233A (en) * | 2005-04-06 | 2006-10-11 | 中华映管股份有限公司 | Liquid crystal display and method for improving its afterimage phenomenon |
| JP2007279642A (en) * | 2006-04-12 | 2007-10-25 | Citizen Holdings Co Ltd | Image display |
| CN101320171B (en) * | 2007-06-08 | 2010-09-29 | 群康科技(深圳)有限公司 | LCD and method for improving power-off ghost |
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