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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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 lives in closely bound up electronic product, people are more and more higher for the requirement of picture quality, thereby the improvement of picture quality also continues as association area the target of pursuing always.
Specifically, when the power supply (VDD) of Thin Film Transistor-LCD is closed, relation due to 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 immediately after power-off, thus the image before still can a residual part on moment picture.Apparently, if there is no 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 object of pixel current potential electric discharge gradually, and this has just caused the appearance of power-off ghost shadow comparatively lasting.
As shown in Figure 1, for prior art liquid crystal panel drive circuit structural representation, liquid crystal panel drive circuit comprises pixel region 500, the TFT that it comprises 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 TFT drain electrode is connected with pixel electrode, data voltage generation module 100, provides data voltage for the data line 510 to pixel region 500, grid voltage generation module 200, for the gate line 520 to pixel region 500, provide grid voltage, one XON functional circuit is set in grid voltage generation module 200 conventionally, the XON function here refers to, when the VDD of liquid crystal panel power down to a certain extent, the XON pin of grid voltage generation module 200 is received after the off signal of panel, the grid of all TFT in grid voltage generation module 200 output VGH unblanking display panels, image retention when occurring picture extremely while shutting down to eliminate and starting shooting, but require the time of shutdown to grow, on pixel capacitance, have all the time electric charge residual, after shutdown, start still can be seen abnormal or image retention at once.
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 output, liquid crystal panel for normal black pattern, general data voltage generating module 100 output black picture voltages (being about 0.4V), all like this pixels are all in an identical voltage position, voltage is all about several volts of zero points, and the voltage of public electrode remains the voltage while designing, be about 5 ~ 7V, then VGH voltage drops to 0V, electric charge in pixel can only slowly leak electricity and disappear, electric charge on public electrode also power down is slow, generally be greater than 50ms, and now the voltage difference at liquid crystal two ends is 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 while shutting down for solving display device on 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 liquid crystal panel drive circuit, comprising:
Control device produces control signal and exports to electric charge release module when shutdown;
Electric charge release module, imports earth terminal according to the control signal of control device output by the residual charge on pixel electrode and public electrode.
Preferably, described control device comprises grid voltage generation module and controls voltage module, described control voltage module input end is connected with described grid voltage generation module, output terminal is connected with electric charge release module, for receive the signal that described grid voltage generation module produces in when shutdown, and according to this signal, produce a driving voltage and offer electric charge release module.
Particularly, described control voltage module comprises operational amplifier and Sheffer stroke gate, operational amplifier input end receives 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 control voltage module, and source electrode is connected with data line or public electrode wire, grounded drain.
The method that liquid crystal panel drive circuit drives, comprising:
Control device produces control signal and exports to electric charge release module when shutdown;
Electric charge release module imports earth terminal according to this control signal by the residual charge on pixel electrode and public electrode.
Preferably, described control device comprises grid voltage generation module and controls voltage module, and control device produces control signal and exports to electric charge release module and be specially when shutdown:
Grid voltage generation module output voltage signal when shutdown is given and is controlled voltage module;
Control voltage module and produce a driving voltage according to this voltage signal, offer 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, according to the drive voltage signal VOUT that controls voltage module output, opens described a plurality of switch elements, and the residual charge on pixel electrode and public electrode is imported to 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 public electrode all be imported to earth terminal; make whole panel residual without any electric charge; the abnormal picture occurring when eliminating shutdown; can reduce the polarized probability of liquid crystal, improve the life-span of liquid crystal panel simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of 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 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 present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of liquid crystal panel drive circuit, comprising: control device produces control signal and exports to electric charge release module when shutdown; Electric charge release module, imports earth terminal according to the control signal of control device output by the residual charge on pixel electrode and public electrode.
The implementation of control device generation control signal has multiple, can be hand push button or the flip flop equipment arranging on liquid crystal panel, when shutdown, by manual control or triggering for generating one control signal, offers electric charge release module.
Preferably, control device comprises grid voltage generation module and controls voltage module, controlling voltage module input end is connected with grid voltage generation module, output terminal is connected with electric charge release module, for at when shutdown signal of producing of receiving grid pole tension generation module, and according to this signal, produce a driving voltage and offer electric charge release module.
As shown in Figure 2, for liquid crystal panel drive circuit structural representation of the present invention, liquid crystal panel drive circuit comprises pixel region 500, the TFT that it comprises 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 TFT drain electrode is connected with pixel electrode; Data voltage generation module 100, provides data voltage for the data line 510 to pixel region 500; Grid voltage generation module 200, provides grid voltage for the gate line 520 to 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, at when shutdown signal of producing of receiving grid pole tension generation module, and according to this signal, produces a driving voltage and offers electric charge release module; Electric charge release module 400 imports earth terminal by the residual charge on pixel electrode and 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, 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 GND end.
As shown in Figure 4, for the present invention controls 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 present invention's operational amplifier 301 used 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, has two inputs and an output, first carries out and computing, then carries out inverse.
XON control signal is produced by XON functional circuit, in the time of the normal work of liquid crystal panel, XON signal is high level, its magnitude of voltage and VCC(3.3V) similar, when the VDD of liquid crystal panel power down to a certain extent, XON signal becomes low level from 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, VGH signal is TFT grid cut-in voltage, output terminal outputting drive voltage signal VOUT.
When liquid crystal panel is normally worked because the magnitude of voltage of VGH signal is larger, XON signal for VGH phase and, its both voltage magnitude must be the same, so XON signal need amplify by preset proportion through operational amplifier 301.XONN signal after 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 liquid crystal panel shutdown, XON becomes the about 0.8V of low level from high level 3.3V, and the XON pin of grid voltage generation module 200 is received after the off signal of panel, the grid of all TFT in grid voltage generation module 200 output VGH unblanking display panels.The XONN signal voltage of XON after operational amplifier amplifies is still low level, VGH signal and VONN signal and non-after, VOUT signal is high level, the grid of the TFT of data line 510 and VCOM line end receives VOUT voltage signal, TFT is opened, now all TFT in display panel also open, the TFT that electric charge on pixel electrode is transferred to data line 510 ends by data line 510 drains, the TFT that electric charge on public electrode is transferred to VCOM line end by VCOM line drains, residual charge on pixel electrode and public electrode all imports earth terminal, thereby make whole panel residual without any electric charge, the abnormal picture occurring when eliminating shutdown, can reduce the polarized probability of liquid crystal simultaneously, 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 while there is no 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 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 XONN signal input part need to add a phase inverter, and VGH signal input part needs grid voltage generation module that low voltage signal VGL is provided.
Grid voltage generation module in embodiment provided by the invention, object 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, meanwhile, also save binding (Bonding) region 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 production capacity and yield have been improved.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, and simultaneously owing to can saving the technique of gate line direction Bonding, to production capacity, promotes also more favourable.
A kind of method that the present invention also provides liquid crystal panel drive circuit to drive, comprising: control device produces control signal and exports to electric charge release module when shutdown; Electric charge release module imports earth terminal according to this control signal by the residual charge on pixel electrode and public electrode.
Control device can offer 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 controls voltage module, grid voltage generation module output voltage signal when shutdown is given and is controlled voltage module, control voltage module and produce a driving voltage according to this voltage signal, offer electric charge release module.
Particularly, as shown in Figure 5, the process flow diagram for the present invention drives above-mentioned liquid crystal panel drive circuit, comprising:
Step 501, grid voltage generation module output voltage signal when shutdown is given and is controlled voltage module;
As an embodiment, grid voltage generation module is provided with XON functional circuit, when liquid crystal panel is normally worked, the XON signal of XON functional circuit output is high level signal VCC, during liquid crystal panel shutdown, the XON signal of XON functional circuit output becomes low level from high level, and grid voltage generation module offers control voltage module by grid cut-in voltage signal VGH and XON signal.
Step 502, control voltage module produce a driving voltage VOUT according to this voltage signal, offer electric charge release module;
Particularly, control high voltage signal VGH and XON signal that voltage module receiving grid pole tension generation module produces, produce a driving voltage VOUT and offer electric charge release module.
Step 503, electric charge release module import earth terminal according to this driving voltage VOUT by the residual charge on pixel electrode and public electrode.
Particularly, electric charge release module comprises a plurality of switch elements, receives and controls the driving voltage VOUT that voltage module produces, when liquid crystal panel is normally worked, 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 shuts down, driving voltage VOUT is high level, and the switch element of electric charge release module is all opened, and the residual charge on pixel electrode and public electrode imports earth terminal.
The present invention also provides a kind of display device, comprise display panel, and adopt the liquid crystal panel drive circuit providing in the present embodiment, can be so that display device discharges the residual charge of pixel region fast when shutdown, solve the abnormal problem of shutdown picture, can reduce the polarized probability of liquid crystal, improve the life-span of liquid crystal panel simultaneously.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, 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 are also considered as protection scope of the present invention.
Claims (6)
1. a liquid crystal panel drive circuit, is characterized in that, comprising:
Control device produces control signal and exports to electric charge release module when shutdown;
Electric charge release module, imports earth terminal according to the control signal of control device output by the residual charge on pixel electrode and public electrode; Wherein,
Described control device comprises grid voltage generation module and controls voltage module, described control voltage module input end is connected with described grid voltage generation module, output terminal is connected with electric charge release module, for receive the signal that described grid voltage generation module produces in when shutdown, and according to this signal, produce a driving voltage and offer electric charge release module; Wherein,
Described control voltage module comprises operational amplifier and Sheffer stroke gate, operational amplifier input end receives 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.
2. 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.
3. liquid crystal panel drive circuit according to claim 2, is characterized in that, described each switch element comprises a thin film transistor (TFT), and its grid is connected with control voltage module, and source electrode is connected with data line or public electrode wire, grounded drain.
4. the method that liquid crystal panel drive circuit drives, is characterized in that, comprising:
Control device produces control signal and exports to electric charge release module when shutdown;
Electric charge release module imports earth terminal according to this control signal by the residual charge on pixel electrode and public electrode; Wherein,
Described control device comprises grid voltage generation module and controls voltage module, and control device produces control signal and exports to electric charge release module and be specially when shutdown:
Grid voltage generation module output voltage signal when shutdown is given and is controlled voltage module;
Control voltage module and produce a driving voltage according to this voltage signal, offer electric charge release module; Wherein,
The voltage signal of described grid voltage generation module output is high voltage VGH signal and XON signal, high voltage signal VGH and XON signal that described control voltage module receiving grid pole tension generation module produces, outputting drive voltage signal VOUT.
5. method according to claim 4, it is characterized in that, described electric charge release module comprises a plurality of switch elements, according to the drive voltage signal VOUT that controls voltage module output, opens described a plurality of switch elements, and the residual charge on pixel electrode and public electrode is imported to earth terminal.
6. a display device, is characterized in that, comprises the liquid crystal panel drive circuit as described in as arbitrary in claims 1 to 3.
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