CN102867491A - 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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- CN102867491A CN102867491A CN2012103219488A CN201210321948A CN102867491A CN 102867491 A CN102867491 A CN 102867491A CN 2012103219488 A CN2012103219488 A CN 2012103219488A CN 201210321948 A CN201210321948 A CN 201210321948A CN 102867491 A CN102867491 A CN 102867491A
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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 present invention relates to technical field of flat panel display, relate in particular to a kind of liquid crystal panel drive circuit and method, display device.
Background technology
In recent years, Thin Film Transistor-LCD TFT-LCD(Thin Film Transistor-Liquid Crystal Display) replaced gradually cathode-ray tube CRT (Cathode Ray Tube) display, become the main flow of display of new generation.Because LCD is widely used in notebook computer, mobile phone and TV etc. and the closely bound up electronic product of life, people are more and more higher for the requirement of picture quality, thereby the improvement of picture quality also continues the target pursued as association area always.
Specifically, when the power supply (VDD) of Thin Film Transistor-LCD when closing, because the relation of charging, after display is through long-time demonstration image, stored charge in the liquid crystal capacitance of meeting between two comparative electrodes, and this stored charge can not discharge behind power-off immediately, thus the image before still can a residual part on the moment picture.Apparently, if there is not additional control circuit exert, the leakage current of the thin film transistor (TFT) self that LCD can only be by corresponding each pixel arrives the purpose of pixel current potential discharge gradually, and this has just caused the appearance of power-off ghost shadow comparatively lasting.
As shown in Figure 1, be prior art liquid crystal panel drive circuit structural representation, liquid crystal panel drive circuit comprises pixel region 500, it comprises the TFT of data line 510, gate line 520, public electrode (VCOM), gate line 520 and data line 510 infalls, TFT grid and gate line 520 are electrically connected, TFT source electrode and data line 510 are electrically connected, and the TFT drain electrode links to each other with pixel electrode; Data voltage generation module 100 is used for providing data voltage to the data line 510 of pixel region 500; Grid voltage generation module 200; be used for providing grid voltage to the gate line 520 of pixel region 500; one XON functional circuit is set in the grid voltage generation module 200 usually; the XON function here refers to; when the VDD of liquid crystal panel power down is arrived to a certain degree; after the XON pin of grid voltage generation module 200 is received the off signal of panel; the grid of all TFT in the grid voltage generation module 200 output VGH unblanking display panels; image retention when occurring picture unusually with start when shutting down to eliminate; but require the time of shutdown to grow; all the time it is residual to have electric charge on the pixel capacitance, and at once start still can be seen unusual or image retention after the shutdown.
For the liquid crystal panel of normal white mode, the voltage (being about 0.5V) of the white picture of general data voltage generating module 100 outputs; Liquid crystal panel for normal black pattern, the black picture voltage (being about 0.4V) of general data voltage generating module 100 outputs, all like this pixels all are in an identical voltage position, voltage all is about several volts of zero points, and the voltage of public electrode remains the voltage when designing, be about 5 ~ 7V, then VGH voltage drops to 0V, electric charge on the pixel can only slowly leak electricity and disappear, electric charge on the public electrode also power down is slow, generally greater than 50ms, and this moment, the voltage difference at liquid crystal two ends was the pressure reduction of same polarity all the time, if this pressure reduction surpasses the threshold voltage of liquid crystal and keeps the long period, can cause liquid crystal polarized, destroy the display performance of liquid crystal, affect the life-span of LCD.
Summary of the invention
The invention provides a kind of liquid crystal panel drive circuit and method, display device, the residual charge when being used for solving the display device shutdown on the pixel capacitance can not discharge fast, causes liquid crystal polarized, destroys the display performance of liquid crystal, affects the LCD life-span.
For solving the problems of the technologies described above, the technical scheme that embodiments of the invention provide is as follows:
A kind of liquid crystal panel drive circuit comprises:
Control device produces control signal and exports to the electric charge release module when shutdown;
The electric charge release module, the control signal of exporting according to control device imports earth terminal with the residual charge on pixel electrode and the public electrode.
Preferably, described control device comprises grid voltage generation module and control voltage module, described control voltage module input end is connected with described grid voltage generation module, output terminal is connected with the electric charge release module, be used for when shutdown, receiving the signal that described grid voltage generation module produces, and produce a driving voltage according to this signal and offer the electric charge release module.
Particularly, described control voltage module comprises operational amplifier and Sheffer stroke gate, the operational amplifier input end receives the XON signal, operational amplifier output terminal is connected with described Sheffer stroke gate one input end, the high voltage signal VGH that another input end receiving grid pole tension generation module of Sheffer stroke gate produces, Sheffer stroke gate output terminal outputting drive voltage signal VOUT.
Preferably, described electric charge release module comprises a plurality of switch elements, and described electric charge release module comprises a plurality of switch elements, and each switch element is connected to data line or public electrode wire one end.
Particularly, described each switch element comprises a thin film transistor (TFT), and its grid is connected with the control voltage module, and source electrode is connected grounded drain with data line or public electrode wire.
The method that a kind of liquid crystal panel drive circuit drives comprises:
Control device produces control signal and exports to the electric charge release module when shutdown;
The electric charge release module imports earth terminal according to this control signal with the residual charge on pixel electrode and the public electrode.
Preferably, described control device comprises grid voltage generation module and control voltage module, and control device generation control signal when shutdown is exported to the electric charge release module and is specially:
Grid voltage generation module output voltage signal when shutdown is given the control voltage module;
The control voltage module produces a driving voltage according to this voltage signal, offers the electric charge release module.
Particularly, described grid voltage generation module output voltage signal is high voltage signal VGH and XON signal, the XON signal that the high voltage signal VGH that described control voltage module receiving grid pole tension generation module produces and XON functional circuit produce, outputting drive voltage signal VOUT.
Preferably, described electric charge release module comprises a plurality of switch elements, and the drive voltage signal VOUT that exports according to the control voltage module opens described a plurality of switch element, and the residual charge on pixel electrode and the public electrode is imported earth terminal.
The present invention also provides a kind of display device, comprises above-mentioned liquid crystal panel drive circuit.
Embodiment provided by the invention has following beneficial effect:
By increasing a control device and electric charge release module; can when liquid crystal panel shuts down, the electric charge on pixel electrode and the public electrode all be imported earth terminal; make whole panel residual without any electric charge; the unusual picture that occurs when eliminating shutdown; simultaneously can reduce the polarized probability of liquid crystal, improve the life-span of liquid crystal panel.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is prior art liquid crystal panel drive circuit structural representation;
Fig. 2 is liquid crystal panel drive circuit structural representation of the present invention;
Fig. 3 is electric charge release module circuit diagram of the present invention;
Fig. 4 is that the present invention controls the voltage module circuit diagram;
Fig. 5 is liquid crystal panel drive method process flow diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The invention provides a kind of liquid crystal panel drive circuit, comprising: control device produces control signal and exports to the electric charge release module when shutdown; The electric charge release module, the control signal of exporting according to control device imports earth terminal with the residual charge on pixel electrode and the public electrode.
The implementation of control device generation control signal has multiple, can be hand push button or the flip flop equipment that arranges at liquid crystal panel, offers the electric charge release module by manual control or triggering for generating one control signal when shutdown.
Preferably, control device comprises grid voltage generation module and control voltage module, control voltage module input end is connected with the grid voltage generation module, output terminal is connected with the electric charge release module, be used for the signal that receiving grid pole tension generation module produces when shutdown, and produce a driving voltage according to this signal and offer the electric charge release module.
As shown in Figure 2, be liquid crystal panel drive circuit structural representation of the present invention, liquid crystal panel drive circuit comprises pixel region 500, it comprises the TFT of data line 510, gate line 520, public electrode (VCOM), gate line 520 and data line 510 infalls, TFT grid and gate line 520 are electrically connected, TFT source electrode and data line 510 are electrically connected, and the TFT drain electrode links to each other with pixel electrode; Data voltage generation module 100 is used for providing data voltage to the data line 510 of pixel region 500; Grid voltage generation module 200 is used for providing grid voltage to the gate line 520 of pixel region 500; Control voltage module 300, input end is connected with grid voltage generation module 200, output terminal is connected with electric charge release module 400, is used for the signal that receiving grid pole tension generation module produces when shutdown, and produces a driving voltage according to this signal and offer the electric charge release module; Electric charge release module 400 is importing earth terminal with the residual charge on pixel electrode and the public electrode under the effect of described driving voltage.
As shown in Figure 3, be electric charge release module circuit diagram of the present invention, described electric charge release module 400 comprises a plurality of switch elements, and each switch element is connected to data line 510 or VCOM line one end.
Particularly, each switch element is a TFT switch, and its grid is connected with control voltage module 200, and source electrode is connected with data line 510 or VCOM line, and drain electrode connects the GND end.
As shown in Figure 4, for the present invention controls the voltage module circuit diagram, described control voltage module 300 comprises operational amplifier 301 and Sheffer stroke gate 302, and operational amplifier 301 has two input ends, in-phase input end and inverting input, an output terminal, the used operational amplifier 301 of the present invention is ratio circuit in the same way, and the in-phase input end of operational amplifier 301 connects input voltage, reverse inter-input-ing ending grounding, the voltage of output end signal and in-phase input end signal is proportional, and ratio can be set as required; Sheffer stroke gate 302 is and the combination of door and not gate, and two inputs and an output are arranged, and carries out first and computing, carries out inverse again.
The XON control signal is produced by the XON functional circuit, in the time of the liquid crystal panel normal operation, the XON signal is high level, its magnitude of voltage and VCC(3.3V) similar, when the VDD of liquid crystal panel power down is arrived to a certain degree, the XON signal becomes low level by high level, and operational amplifier 301 input ends are accepted panel off signal XON, output terminal output amplifying signal XONN.
Operational amplifier 301 in-phase output ends connect Sheffer stroke gate 302 1 input ends, Sheffer stroke gate 302 another input ends connect grid voltage generation module 200, all the time accept the high voltage signal VGH that grid voltage generation module 200 produces, the VGH signal is TFT grid cut-in voltage, output terminal outputting drive voltage signal VOUT.
Liquid crystal panel when normal operation because the magnitude of voltage of VGH signal is larger, the XON signal for the VGH phase with, its both voltage magnitude must be the same, so the XON signal needs to amplify by preset proportion through operational amplifier 301.XONN signal after the amplification and VGH are high level, with non-rear output VOUT signal be low level, the TFT of data line 510 and VCOM line end does not all open, pixel electrode voltage and common electric voltage are normal value.
During the liquid crystal panel shutdown, XON becomes the about 0.8V of low level by high level 3.3V, after the XON pin of grid voltage generation module 200 is received the off signal of panel, and the grid of all TFT in the grid voltage generation module 200 output VGH unblanking display panels.The XONN signal voltage of XON after operational amplifier amplifies still is low level; VGH signal and VONN signal and non-after; the VOUT signal is high level; the grid of the TFT of data line 510 and VCOM line end receives the VOUT voltage signal; TFT is opened; all TFT in the display panel also open at this moment; electric charge on the pixel electrode is transferred to the TFT drain electrode of data line 510 ends by data line 510; electric charge on the public electrode is transferred to the TFT drain electrode of VCOM line end by the VCOM line; residual charge on pixel electrode and the public electrode all imports earth terminal; thereby make whole panel residual without any electric charge; the unusual picture that occurs when eliminating shutdown; simultaneously can reduce the polarized probability of liquid crystal, improve the life-span of liquid crystal panel.
The off-mode of liquid crystal panel of the present invention refers to that liquid crystal panel do not work, the state when not having picture output.
The TFT of data line of the present invention and VCOM line end can be P type or N-type TFT, and when TFT is the P type, opening of TFT needs grid to receive high potential signal; When TFT is N-type, opening of TFT needs grid to receive low-potential signal, and the XONN signal input part need to add a phase inverter, and the VGH signal input part needs the grid voltage generation module that low voltage signal VGL is provided.
Grid voltage generation module among the embodiment provided by the invention, purpose is to provide signal to pixel region; It can be formed on the driving circuit of liquid crystal display by array processes, i.e. (Gate driver On the Array, GOA).This integrated technique not only provides cost savings, and can accomplish the design for aesthetic of panel both sides symmetry, simultaneously, also save binding (Bonding) zone of gate line integrated circuit and the wiring space of fan-out (Fan-out), thereby can realize the design of narrow frame; And this integrated technique can also save the Bonding technique of gate line direction, thereby has improved production capacity and yield.Compare traditional thin film chip integrated (Chip On Film, COF) and glass-chip integrated (Chip On Glass, COG) technique, it not only provides cost savings, owing to can save the technique of gate line direction Bonding, promotes also more favourable to production capacity simultaneously.
The method that the present invention also provides a kind of liquid crystal panel drive circuit to drive comprises: control device produces control signal and exports to the electric charge release module when shutdown; The electric charge release module imports earth terminal according to this control signal with the residual charge on pixel electrode and the public electrode.
Control device can offer the electric charge release module by manual control or triggering for generating one control signal when shutdown, preferably, described control device comprises grid voltage generation module and control voltage module, grid voltage generation module output voltage signal when shutdown is given the control voltage module, the control voltage module produces a driving voltage according to this voltage signal, offers the electric charge release module.
Particularly, as shown in Figure 5, for the present invention to the process flow diagram that above-mentioned liquid crystal panel drive circuit drives, comprising:
As an embodiment, the grid voltage generation module is provided with the XON functional circuit, during the liquid crystal panel normal operation, the XON signal of XON functional circuit output is high level signal VCC, during the liquid crystal panel shutdown, the XON signal of XON functional circuit output becomes low level by high level, and the grid voltage generation module offers the control voltage module with grid cut-in voltage signal VGH and XON signal.
Particularly, high voltage signal VGH and XON signal that control voltage module receiving grid pole tension generation module produces produce a driving voltage VOUT and offer the electric charge release module.
Particularly, the electric charge release module comprises a plurality of switch elements, receives the driving voltage VOUT that the control voltage module produces, when liquid crystal panel works, driving voltage VOUT is low level, and the switch element of electric charge release module is not opened, and pixel electrode voltage and public electrode voltages are normal value; When liquid crystal panel shut down, driving voltage VOUT was high level, and the switch element of electric charge release module is all opened, and the residual charge on pixel electrode and the public electrode imports earth terminal.
The present invention also provides a kind of display device, comprise display panel, and the liquid crystal panel drive circuit that provides in the employing present embodiment, can be so that display device discharges the residual charge of pixel region when shutdown fast, solve the unusual problem of shutdown picture, simultaneously can reduce the polarized probability of liquid crystal, improve the life-span of liquid crystal panel.
Be understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (10)
1. a liquid crystal panel drive circuit is characterized in that, comprising:
Control device produces control signal and exports to the electric charge release module when shutdown;
The electric charge release module, the control signal of exporting according to control device imports earth terminal with the residual charge on pixel electrode and the public electrode.
2. liquid crystal panel drive circuit according to claim 1, it is characterized in that, described control device comprises grid voltage generation module and control voltage module, described control voltage module input end is connected with described grid voltage generation module, output terminal is connected with the electric charge release module, be used for when shutdown, receiving the signal that described grid voltage generation module produces, and produce a driving voltage according to this signal and offer the electric charge release module.
3. liquid crystal panel drive circuit according to claim 2, it is characterized in that, described control voltage module comprises operational amplifier and Sheffer stroke gate, the operational amplifier input end receives the XON signal, operational amplifier output terminal is connected with described Sheffer stroke gate one input end, the high voltage signal VGH that another input end receiving grid pole tension generation module of Sheffer stroke gate produces, Sheffer stroke gate output terminal outputting drive voltage signal VOUT.
4. liquid crystal panel drive circuit according to claim 1 is characterized in that, described electric charge release module comprises a plurality of switch elements, and each switch element is connected to data line or public electrode wire one end.
5. liquid crystal panel drive circuit according to claim 4 is characterized in that, described each switch element comprises a thin film transistor (TFT), and its grid is connected with the control voltage module, and source electrode is connected grounded drain with data line or public electrode wire.
6. the method that liquid crystal panel drive circuit drives is characterized in that, comprising:
Control device produces control signal and exports to the electric charge release module when shutdown;
The electric charge release module imports earth terminal according to this control signal with the residual charge on pixel electrode and the public electrode.
7. method according to claim 6 is characterized in that, described control device comprises grid voltage generation module and control voltage module, and control device generation control signal when shutdown is exported to the electric charge release module and is specially:
Grid voltage generation module output voltage signal when shutdown is given the control voltage module;
The control voltage module produces a driving voltage according to this voltage signal, offers the electric charge release module.
8. method according to claim 7, it is characterized in that, the voltage signal of described grid voltage generation module output is high voltage VGH signal and XON signal, the XON signal that the high voltage signal VGH that described control voltage module receiving grid pole tension generation module produces and XON functional circuit produce, outputting drive voltage signal VOUT.
9. method according to claim 8, it is characterized in that, described electric charge release module comprises a plurality of switch elements, and the drive voltage signal VOUT that exports according to the control voltage module opens described a plurality of switch element, and the residual charge on pixel electrode and the public electrode is imported earth terminal.
10. a display device is characterized in that, comprises such as the arbitrary described liquid crystal panel drive circuit of claim 1 to 5.
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