CN101236318A - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN101236318A CN101236318A CNA200710073200XA CN200710073200A CN101236318A CN 101236318 A CN101236318 A CN 101236318A CN A200710073200X A CNA200710073200X A CN A200710073200XA CN 200710073200 A CN200710073200 A CN 200710073200A CN 101236318 A CN101236318 A CN 101236318A
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Abstract
The invention provides a liquid crystal display device and a drive method thereof. The liquid crystal display device comprises a first baseplate, a second baseplate and a liquid crystal layer; the second baseplate and the first baseplate are arranged oppositely; the liquid crystal layer is clamped between the first baseplate and the second baseplate; the surface of the second baseplate close to the liquid crystal layer is provided with a plurality of parallel scanning beams, a plurality of data wires vertical to the scanning beam and a discharge circuit; the surface of the first baseplate close to the liquid crystal layer is alternately provided with a plurality of common electrodes parallel to the scanning beams; each common electrode corresponds to at least one scanning beam, wherein, the discharge circuit is arranged on the edge of the surface of the second baseplate close to the liquid crystal layer, connected to the common electrodes and can short-circuit the common electrodes. The liquid crystal display device of the invention has small electric power consumption.
Description
Technical field
The present invention is about a kind of liquid crystal indicator and driving method thereof.
Background technology
In thin-film transistor LCD device, the demonstration of image is the electric field that loads on each pixel by change, and changing the windup-degree with the pairing liquid crystal molecule of this pixel, and then the throughput of control light realizes.If utilize direct current (DC) signal to drive liquid crystal molecule, liquid crystal molecule will near a deflection direction, after a period of time, the physical characteristics of liquid crystal molecule will be destroyed because of continuing to be in a certain direction, can't be according to loading the correct rotation of thereon electric field to form GTG.So thin-film transistor LCD device adopts interchange (AC) signal inversion driving liquid crystal molecule mostly, make alternately deflection in the opposite direction of liquid crystal molecule, prevent its physical characteristics destruction.Common inversion driving has: frame inversion driving, row inversion driving, row inversion driving and some inversion driving etc.
Seeing also Fig. 1, is a kind of structural representation of liquid crystal indicator of prior art exposure.This liquid crystal indicator 1 comprises a display panels 10 and one and the module backlight 19 of these display panels 10 stacked settings.This display panels 10 comprises one first substrate 11, one second substrate 12 and a liquid crystal layer 13.This first substrate 11 is oppositely arranged with this second substrate 12, and this liquid crystal layer 13 is folded between this first substrate 11 and second substrate 12.
Please consulting Fig. 2 together, is the structural representation of first substrate 11 of display panels 10 shown in Figure 1.This first substrate 11 is provided with a plurality of strip public electrodes 15 that are parallel to each other near the surface of this liquid crystal layer 13, and wherein, this odd column public electrode 15 is electrically connected, and even column public electrode 15 is electrically connected.
Please consulting Fig. 3 together, is the structural representation of display panels 10 second substrates 12 shown in Figure 1.This second substrate 12 is provided with many sweep traces parallel to each other 121 near the surface of this liquid crystal layer 13, many parallel to each other and data lines 122 that intersect vertically with 121 insulation of this sweep trace respectively, be adjacent to a plurality of thin film transistor (TFT)s 123 of this sweep trace 121 and these data line 122 intersections, and a plurality of pixel electrodes 17 that are arranged.This sweep trace 121 and a plurality of pixels of these data line 122 definition, a corresponding pixel electrode 17 of each pixel and a thin film transistor (TFT) 123, this pixel is the minimum display unit of this display panels 10.
This second substrate 12 also is provided with a sequential control circuit 124, a data drive circuit 125, scan driving circuit 126 and a public voltage generating circuit 127 near the edge on the surface of this liquid crystal layer 13.This scan drive circuit 126 is used to provide sweep signal to this sweep trace 121, this data driving circuit 125 is used to provide the gray scale voltage of data representing image to this data line 122, this public voltage generating circuit 127 is used to provide two different common electric voltages to this odd number bar public electrode 15 and even number bar public electrode 15, and this sequential control circuit 124 is used for controlling this scan drive circuit 126, data drive circuit 125 and public voltage generating circuit 127 and concerns work according to certain time sequence.
Each pixel comprises a liquid crystal capacitance (Clc) and a storage capacitors (Cs).The definition display voltage is the poor of these pixel electrode 17 voltages and this public electrode 15 voltages, and then the voltage of this two electric capacity is display voltage, and it is used for keeping the time of display voltage one frame of this pixel.
Please consulting Fig. 4 together, is the working timing figure of this liquid crystal indicator 1 shown in Figure 1.Wherein, " Frame1 " represents the former frame time, " Frame2 " represents back one frame time, " G1～G2n " is a plurality of sweep signal oscillograms, " Vn " is the gray scale voltage oscillogram that n bar data line 122 loads, " Vcom1 " is the common electric voltage that loads on this odd column public electrode 15, and " Vcom2 " is the common electric voltage that loads on this even column public electrode 15.
Former frame as shown in Figure 4 is in the time, during this 2n-1 bar sweep trace 121 is scanned, the gray scale voltage that the thin film transistor (TFT) 123 that these many data lines 122 list by this 2n-1 is loaded on the respective pixel electrode 17 is one first gray scale voltage, with the common electric voltage of these 2n-1 bar sweep trace 121 corresponding odd column public electrodes 15 be first common electric voltage.Wherein this first common electric voltage is negative value for just and greater than this first gray scale voltage so 2n-1 lists the display voltage of all pixels.During 2n bar sweep trace 121 is scanned, the gray scale voltage that the thin film transistor (TFT) 123 that these many data lines 122 list by this 2n is loaded on the respective pixel electrode 17 is second gray scale voltage, and the common electric voltage of the even column public electrode 15 relative with this 2n bar sweep trace 121 is second common electric voltage.Wherein this second common electric voltage is for negative and less than this second gray scale voltage, thus 2n list all pixel gray level voltages be on the occasion of.Treat that this frame picture scanning finishes, the polarity of the display voltage that all pixels loaded is shown in Fig. 5 (a) on this display panels 10.
In one frame time of back, during this 2n-1 bar sweep trace 121 is scanned, the gray scale voltage that the thin film transistor (TFT) 123 that these many data lines 122 list by this 2n-1 is loaded on the respective pixel electrode 17 is second gray scale voltage, and the common electric voltage of the odd column public electrode 15 relative with this 2n-1 bar sweep trace 121 is second common electric voltage.Wherein this second common electric voltage is for negative and less than this second gray scale voltage, thus 2n-1 list the display voltage of all pixels be on the occasion of.During 2n bar sweep trace 121 is scanned, the gray scale voltage that the thin film transistor (TFT) 123 that these many data lines 122 list by this 2n is loaded on the respective pixel electrode 17 is first gray scale voltage, and the common electric voltage of the even column public electrode 15 relative with this 2n bar sweep trace 121 is first common electric voltage.Wherein this first common electric voltage is negative value for just and greater than this first gray scale voltage so 2n lists all pixel gray level voltages.After treating that the scanning of this frame picture is finished, the polarity of the display voltage that all pixels loaded is shown in Fig. 5 (b) on this display panels 10.
Please consulting Fig. 5 together, is the display voltage polarity synoptic diagram of these display panels 10 pixels under the type of drive shown in Figure 4.According to above-mentioned principle, in any frame, the display voltage of any row pixel is opposite with the display voltage polarity of adjacent column pixel, and the display voltage of any row pixel in any frame is opposite with display voltage polarity in the consecutive frame.Thereby realized the row inversion driving.
But because each pixel comprises a liquid crystal capacitance and a storage capacitors, and two electric capacity all are electrically connected with this public electrode 15.The common electric voltage that all needs to change this odd number bar public electrode 15 and even number bar public electrode 15 when arbitrarily continuous two frames replace, this process are will this a plurality of liquid crystal capacitance and storage capacitors reverse charging with extraneous electric energy, so power consumption is bigger.
Summary of the invention
In order to solve the bigger problem of above-mentioned liquid crystal indicator power consumption, be necessary the liquid crystal indicator that provides a kind of power consumption less.
In order to solve the bigger problem of above-mentioned liquid crystal indicator power consumption, be necessary to provide a kind of less liquid crystal display apparatus driving circuit of liquid crystal indicator power consumption that makes real for essential.
A kind of liquid crystal indicator, it comprises one first substrate, one second substrate and a liquid crystal layer, and this second substrate and this first substrate are oppositely arranged, and this liquid crystal layer is held between this first substrate and this second substrate; This second substrate is provided with many sweep traces that are parallel to each other near the surface of this liquid crystal layer, many data lines vertical with this sweep trace and a discharge circuit; This first substrate is provided with a plurality of public electrodes that are parallel to this sweep trace near the spaced surface of this liquid crystal layer, and each public electrode correspondence is the one scan line at least; Wherein, this discharge circuit is arranged on the edge of this second substrate near this liquid crystal layer surface, and is connected to this public electrode, and can this public electrode of short circuit.
Compared to prior art, liquid crystal indicator of the present invention is owing to adopted this discharge circuit, the a plurality of public electrodes that make this liquid crystal indicator are when changing the voltage that is loaded, can make its discharge by this public electrode of first short circuit, then utilize extraneous electric energy to make this public electrode be loaded on required voltage again, reduce the external world's used electric charge of this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less.
A kind of driving method of liquid crystal indicator, this liquid crystal indicator comprises many sweep traces that are parallel to each other, many the data lines vertical with this sweep trace, a plurality of public electrodes that are parallel to this sweep trace, each public electrode correspondence is the one scan line at least, the driving method of this liquid crystal indicator comprises the steps: that in a frame time this odd-numbered line public electrode loads one first common electric voltage, and this even number line public electrode loads one second common electric voltage; In time before next frame begins after this frame end, this odd-numbered line public electrode of short circuit and this even number line public electrode; In time, this odd-numbered line public electrode loads this second common electric voltage at next frame, and this even number line public electrode loads this first common electric voltage; At last, and with this two frame is the cycle to repeat above-mentioned action.
Compared to prior art, liquid crystal display apparatus driving circuit of the present invention exchanges in the common electric voltage process that loads on this odd-numbered line public electrode and this even number line public electrode between two continuous frames owing to making, make charging neutrality on this odd-numbered line public electrode and this even number line public electrode by short circuit dischange, then utilize extraneous electric energy that the voltage on this odd-numbered line public electrode and this even number line public electrode is added to required first common electric voltage or second common electric voltage respectively again, reduce the external world's used electric charge of this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less.
A kind of liquid crystal indicator, it comprises one first substrate, one second substrate and a liquid crystal layer, and this second substrate and this first substrate are oppositely arranged, and this liquid crystal layer is held between this first substrate and second substrate; This second substrate is provided with many sweep traces that are parallel to each other near the surface of this liquid crystal layer, many data lines vertical with this sweep trace and a discharge circuit; This first substrate is provided with a plurality of public electrodes that are parallel to this data line near the spaced surface of this liquid crystal layer, the corresponding at least one data line of each public electrode; Wherein, this discharge circuit is arranged on the edge of this second substrate near this liquid crystal layer surface, and is connected to this public electrode, and can this public electrode of short circuit.
Compared to prior art, liquid crystal indicator of the present invention is owing to adopted this discharge circuit, the a plurality of public electrodes that make this liquid crystal indicator are when changing the voltage that is loaded, can make its discharge by this public electrode of first short circuit, then utilize extraneous electric energy to make this public electrode be loaded on required voltage again, reduce the external world's used electric charge of this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less.
A kind of driving method of liquid crystal indicator, this liquid crystal indicator comprises many sweep traces that are parallel to each other, many the data lines vertical with this sweep trace, a plurality of public electrodes that are parallel to this data line, the corresponding at least one data line of each public electrode, the driving method of this liquid crystal indicator comprises the steps: that in a frame time this odd column public electrode loads one first common electric voltage, and this even column public electrode loads one second common electric voltage; In time before next frame begins after this frame end, this odd column public electrode of short circuit and this even column public electrode; In time, this odd column public electrode loads this second common electric voltage at next frame, and this even column public electrode loads this first common electric voltage; At last, and with this two frame is the cycle to repeat above-mentioned action.
Compared to prior art, liquid crystal display apparatus driving circuit of the present invention exchanges in the common electric voltage process that loads on this odd column public electrode and this even column public electrode between two continuous frames owing to making, make charging neutrality on this odd column public electrode and this even column public electrode by short circuit dischange, then utilize extraneous electric energy that the voltage on this odd column public electrode and this even column public electrode is added to required first common electric voltage or second common electric voltage respectively again, reduce the external world's used electric charge of this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less.
Description of drawings
Fig. 1 is a kind of structural representation of display panels of prior art exposure.
Fig. 2 is the structural representation of display panels first substrate shown in Figure 1.
Fig. 3 is the structural representation of display panels second substrate shown in Figure 1.
Fig. 4 is the working timing figure of this liquid crystal indicator shown in Figure 1.
Fig. 5 is the gray scale voltage polarity synoptic diagram of this display panels pixel under the described type of drive of Fig. 4.
Fig. 6 is the perspective view of liquid crystal indicator first embodiment of the present invention.
Fig. 7 is the structural representation of first substrate of liquid crystal indicator shown in Figure 6.
Fig. 8 is the structural representation of second substrate of liquid crystal indicator shown in Figure 6.
Fig. 9 is the circuit component figure of the discharge circuit of liquid crystal indicator of the present invention.
Figure 10 is the working timing figure of the liquid crystal indicator of first embodiment of the invention.
Figure 11 is the display voltage polarity synoptic diagram of this display panels pixel under the described type of drive of Figure 10.
Figure 12 is the structural representation of first substrate in liquid crystal indicator second embodiment of the present invention.
Figure 13 is the structural representation of second substrate in liquid crystal indicator second embodiment of the present invention.
Figure 14 is the working timing figure of the liquid crystal indicator of second embodiment of the invention.
Figure 15 is the display voltage polarity synoptic diagram of this display panels pixel under the type of drive shown in Figure 14.
Embodiment
Seeing also Fig. 6, is the perspective view of liquid crystal indicator first embodiment of the present invention.This liquid crystal indicator 2 comprises a display panels 20 and a module 29 backlight.This display panels 20 and these module 29 stacked settings backlight.This display panels 20 comprises one first substrate 21, one second substrate 22, a frame glue 24 and a liquid crystal layer 23, this second substrate 22 is oppositely arranged with this first substrate 21, this frame glue 24 is attached between this first substrate 21 and second substrate 22, and cooperating this two substrate 21,22 to form the receiving space of a sealing, this liquid crystal layer 23 is contained in this receiving space.Wherein, this frame glue 24 comprises one first current-carrying part 241 insulated from each other and one second current-carrying part 242.
Please consult Fig. 7 and Fig. 8 together, Fig. 7 is the structural representation of first substrate 21 of liquid crystal indicator 2 shown in Figure 6; Fig. 8 is the structural representation of liquid crystal indicator 2 second substrates 22 shown in Figure 6.This first substrate 21 is provided with a plurality of strip public electrodes 25 that are parallel to each other near the surface of this liquid crystal layer 23, is positioned at first bus 251 and second bus 252 of these a plurality of public electrode 25 2 sides.This odd-numbered line public electrode 25 is electrically connected with this first bus 251, and this even number line public electrode 25 is electrically connected with second bus 252.This public electrode 25 can be made by the tin indium oxide material.
This second substrate 22 is provided with many sweep traces parallel to each other 221 near the surface of liquid crystal layer 23, many the public electrode wires 26 parallel with this sweep trace 221, be positioned at the 3rd bus 261 and the 4th bus 262 of these public electrode wire 26 both sides, many parallel to each other and data lines 222 that intersect vertically with 221 insulation of this sweep trace respectively, be adjacent to a plurality of thin film transistor (TFT)s 223 of this sweep trace 221 and these data line 222 intersections, and a plurality of pixel electrodes 27 that are arranged.Each pixel electrode 27, liquid crystal molecule and this public electrode 25 corresponding with this pixel electrode 27 constitute a pixel with these pixel electrode 27 corresponding regions, also form the liquid crystal capacitance Clc (figure does not show) of this pixel simultaneously.Wherein, this pixel is the minimum display unit of this display panels 20.
This second substrate 22 also is provided with a sequential control circuit 224, a data drive circuit 225, scan driving circuit 226, a public voltage generating circuit 227 and a discharge circuit 228 near the edge on the surface of this liquid crystal layer 23.
Each thin film transistor (TFT) 223 corresponding these pixel electrodes 27, and its grid (indicating) is connected to corresponding one scan line 221, and source electrode (indicating) is connected to a corresponding data line 222, and drain electrode (indicating) is connected to corresponding pixel electrode 27.
Every public electrode wire 26 is parallel with this public electrode 25, and odd-numbered line public electrode wire 26 is electrically connected with the 3rd bus 261, and even number line public electrode wire 26 is electrically connected with the 4th bus 262.Each bar public electrode wire 26 overlaps with pixel electrode 27 insulation at this row place, this public electrode wire 26, with arbitrary pixel electrode 27 of its overlapping and be sandwiched in the storage capacitors Cs (scheming not show) that insulation material layer (scheming not show) between this public electrode wire 26 and this pixel electrode 27 forms this pixel.
This frame glue 24 adheres to this first substrate 21 and this second substrate 22 simultaneously, and its first current-carrying part 241 makes the 3rd bus 261 on this second substrate 22 be electrically connected with first bus 251 on first substrate 21; This second current-carrying part 242 makes the 4th bus 262 on this second substrate 22 be electrically connected with second bus 252 on this first substrate 21.
This scan drive circuit 226 independently be connected to every sweep trace 221 be used for for every line independent sweep signal is provided; This data drive circuit 225 independently is connected to every data line 222 and is used for providing separately for every sweep trace 221 gray scale voltage of data representing image; This public voltage generating circuit 227 is electrically connected to the 3rd bus 261 and the 4th bus 262 respectively and is used for independently providing common electric voltage for this odd number bar public electrode 25 and even number bar public electrode 25; This discharge circuit 228 is connected to the 3rd bus 261 and the 4th bus 262 respectively, is used for before changing common electric voltage the 3rd bus 261 and 262 short circuits of the 4th bus being discharged; This sequential control circuit 224 is used for controlling this scan drive circuit 226, data drive circuit 225, public voltage generating circuit 227 and this discharge circuit 228 and concerns work according to certain time sequence.
So far, the 3rd bus 261 is electrically connected with the Cs of this odd-numbered line pixel by this odd-numbered line public electrode wire 26; The 4th bus 262 is electrically connected with the Cs of this even number line pixel by this even number line public electrode wire 26; The 3rd bus 261 is electrically connected with the Clc of this odd-numbered line pixel by first current-carrying part 241, first bus 251 and this odd-numbered line public electrode 25 of this frame glue 24; The 4th bus 262 is electrically connected with the Clc of this even number line pixel by second current-carrying part 242, second bus 252 and this even number line public electrode 25 of this frame glue 24.
Seeing also Fig. 9, is the circuit component figure of the discharge circuit 228 of liquid crystal indicator 2 of the present invention.This discharge circuit 228 mainly comprises a transistor unit, and this transistor drain d is connected to the 3rd bus 261, and this source electrode s is connected to the 4th bus 262, and this grid g is connected to this sequential control circuit 224.
During these liquid crystal indicator 2 work, in the n frame time, the odd-numbered line public electrode 25 that the 3rd bus 261 is electrically connected loads first a positive common electric voltage, and the even number line public electrode 25 that the 4th bus 262 is electrically connected loads second a negative common electric voltage; In the n+1 frame time, change the common electric voltage that this odd-numbered line public electrode 25 and this even number line public electrode 25 load.So repeat, and cooperate the capable inversion driving of suitable gray scale voltage.
Before beginning with the n+1 frame after the n frame, these sequential control circuit 224 these public voltage generating circuits 227 of control stop outputting common voltage.Meanwhile, these sequential control circuit 224 control these discharge circuit 228 short circuits the 3rd bus 261 and the 4th buses 262, i.e. this sequential control circuit 224 outputs one high voltage transistorized grid g to this discharge circuit 228 makes this transistor drain d and source electrode s conducting.Like this, make the Cs of the pixel that the 3rd bus 261 is electrically connected and the Cs and the stored charging neutrality of Clc of the pixel that the stored electric charge of Clc is electrically connected with the 4th bus 262.
Because the Cs and the Clc of each pixel are basic identical, the pixel quantity of the 3rd bus 261,262 electrical connections of the 4th bus is identical again, so the capacitance size of the 3rd bus 261,262 electrical connections of the 4th bus is basic identical.According to the basic electricity principle as can be known, after the enough time, do not have electric current to pass through substantially between this drain electrode d and the source electrode s, voltage is the mean value of first common electric voltage and second common electric voltage, i.e. intermediate value substantially on the 3rd bus 261 and the 4th bus 262.
After voltage reaches the mean value of first common electric voltage and second common electric voltage on the 3rd bus 261 and the 4th bus 262, these sequential control circuit 224 these discharge circuits 228 of control stop short circuit the 3rd bus 261 and the 4th bus 262, i.e. this sequential control circuit 224 outputs one low-voltage transistorized grid g to this discharge circuit 228 closes this transistor drain d and source electrode s.Meanwhile, the required common electric voltage of these public voltage generating circuit 227 output n+1 frames of these sequential control circuit 224 controls.
Compared to prior art, liquid crystal indicator 2 of the present invention is owing to adopted this discharge circuit 228, and a plurality of public electrodes 25 that make this liquid crystal indicator 2 can make its discharge by this public electrode 25 of first short circuit when changing the voltage that is loaded.Especially in the common electric voltage process that between two continuous frames, loads on exchange the 3rd bus 261 and the 4th bus 262, can make voltage on the 3rd bus 261 and the 4th bus 262 reach the mean value of this first common electric voltage and second common electric voltage by short circuit dischange, then this public voltage generating circuit 227 utilizes extraneous electric energy that the voltage on the 3rd bus 261 and the 4th bus 262 is added to required first common electric voltage or second common electric voltage respectively again, reduced when exchanging this common electric voltage the external world's spent electric energy of electric charge on this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less, more can embody and bring into play the liquid crystal indicator advantage of low power consumption.
The driving method of this liquid crystal indicator 2 comprises the steps:
In a frame time, this odd-numbered line public electrode 25 loads one first common electric voltage, and this even number line public electrode 25 loads one second common electric voltage.And in this frame time, scan this sweep trace 221 successively, when this odd line interlace line 221 of scanning, this data line 222 loads one first gray scale voltage, and when this even number line sweep trace 221 of scanning, this data line 222 loads one second gray scale voltage;
Before after this frame end, beginning to next frame, short circuit this odd-numbered line public electrode 25 and this even number line public electrode 25;
In one frame time of back, this odd-numbered line public electrode wire 26 loads this second common electric voltage, and this even number line public electrode wire 26 loads this first common electric voltage.And in this frame time, scan this sweep trace 221 successively, when this odd line interlace line 221 of scanning, this data line 222 loads this second gray scale voltage, and when this even number line sweep trace 221 of scanning, this data line 222 loads this first gray scale voltage;
Wherein, this first common electric voltage greater than this first gray scale voltage and this second common electric voltage less than this second gray scale voltage.
Please consulting Figure 10 together, is the working timing figure of the liquid crystal indicator 2 of first embodiment of the invention.Wherein, " Frame1 " represents the former frame time, " Frame2 " represents back one frame time, " Blank " represents the time between two frames, " G1～G2n " is the multi-strip scanning signal waveforms, " Vn " is the gray scale voltage oscillogram that n bar data line 222 loads, and " Vcom1 " is the common electric voltage that loads on this odd-numbered line public electrode wire 26, and " Vcom2 " is the common electric voltage that loads on this even number line public electrode wire 26.
The principle of work of this liquid crystal indicator 2 is described below:
Former frame as shown in figure 10 is in the time, during this 2n-1 bar sweep trace 221 is scanned, these many data lines 222 gray scale voltage that the thin film transistor (TFT) 223 on capable is loaded on the respective pixel electrode 27 by this 2n-1 is first gray scale voltage, with the common electric voltage of these 2n-1 bar sweep trace 221 corresponding odd-numbered line public electrodes 25 be first common electric voltage.Wherein this first common electric voltage is for just and greater than this first gray scale voltage, thus 2n-1 capable on the display voltage of all pixels be negative value.During 2n bar sweep trace 221 is scanned, these many data lines 222 gray scale voltage that the thin film transistor (TFT) 223 on capable is loaded on the respective pixel electrode 27 by this 2n is second gray scale voltage, and the common electric voltage of the even number line public electrode 25 relative with this 2n bar sweep trace 221 is second common electric voltage.Wherein this second common electric voltage is for negative and less than this second gray scale voltage, thus 2n capable on all pixel gray level voltages be on the occasion of.After treating that the scanning of this frame picture is finished, the polarity of the display voltage that all pixels loaded is shown in Figure 11 (a) on this display panels 20.
Before after this frame end, beginning to next frame, short circuit this odd-numbered line public electrode 25 and this even number line public electrode 25.Because the Cs of each pixel is basic identical, Clc is also basic identical, the pixel quantity of this odd-numbered line public electrode 25,25 electrical connections of even number line public electrode is identical again, so the total capacitance size that is electrically connected with this odd-numbered line public electrode 25 and this even number line public electrode 25 is basic identical respectively.According to the basic electricity principle as can be known, the time long enough before if this frame end of setting begins to next frame afterwards, voltage is the mean value of first common electric voltage and second common electric voltage, i.e. intermediate value substantially on this odd-numbered line public electrode 25 and this even number line public electrode 25.
In one frame time of back, during this 2n-1 bar sweep trace 221 is scanned, these many data lines 222 gray scale voltage that the thin film transistor (TFT) 223 on capable is loaded on the respective pixel electrode 27 by this 2n-1 is second gray scale voltage, and the common electric voltage of the odd-numbered line public electrode 25 relative with this 2n-1 bar sweep trace 221 is second common electric voltage.Wherein this second common electric voltage is for negative and less than this second gray scale voltage, thus 2n-1 capable on the display voltage of all pixels be on the occasion of.During 2n bar sweep trace 221 is scanned, these many data lines 222 gray scale voltage that the thin film transistor (TFT) 223 on capable is loaded on the respective pixel electrode 27 by this 2n is first gray scale voltage, and the common electric voltage of the even number line public electrode 25 relative with this 2n bar sweep trace 221 is first common electric voltage.Wherein this first common electric voltage is for just and greater than this first gray scale voltage, thus 2n capable on all pixel gray level voltages be negative value.After treating that the scanning of this frame picture is finished, the polarity of the display voltage that all pixels loaded is shown in Figure 11 (b) on this display panels 20.
Compared to prior art, liquid crystal display apparatus driving circuit of the present invention is owing to make in the common electric voltage process that exchanges loading on this odd-numbered line public electrode 25 and this even number line public electrode 25 between two continuous frames, make this odd-numbered line public electrode 25 and the voltage on this even number line public electrode 25 reach the mean value of this first common electric voltage and second common electric voltage by short circuit dischange, then utilize extraneous electric energy that the voltage on this odd-numbered line public electrode 25 and this even number line public electrode 25 is added to required first common electric voltage or second common electric voltage respectively again, reduce the external world's used electric charge of this public electrode that is used for neutralizing, make the power consumption of this liquid crystal indicator less, more can embody and bring into play the liquid crystal indicator advantage of low power consumption.
Please consult Figure 12 and Figure 13 together, Figure 12 is the structural representation of first substrate in liquid crystal indicator second embodiment of the present invention, and Figure 13 is the structural representation of second substrate in liquid crystal indicator second embodiment of the present invention.The difference of liquid crystal indicator 2 is in the liquid crystal indicator of present embodiment and first embodiment: these a plurality of public electrode wires 36 and public electrode 35 are perpendicular to this multi-strip scanning line 321.
The driving method of this liquid crystal indicator comprises the steps: that at first in a frame time, this odd column public electrode 35 loads one first common electric voltage, and this even column public electrode 35 loads one second common electric voltage.And in this frame time, this odd column data line 322 loads first gray scale voltage, and this even column data line 322 loads second gray scale voltage; Before extremely back one frame begins after this frame end, short circuit this odd column public electrode 35 and this even column public electrode 35; Then, in one frame time of back, this odd column public electrode 35 loads one second common electric voltage, and this even column public electrode 35 loads one first common electric voltage.And in this frame time, this odd column data line 322 loads second gray scale voltage, and this even column data line 322 loads first gray scale voltage; Wherein this first common electric voltage is for just and greater than this first gray scale voltage, and this second common electric voltage is for negative and less than this second gray scale voltage.
Please consulting Figure 14 together, is the working timing figure of this liquid crystal indicator of second embodiment of the invention.Wherein, " Frame1 " represents the former frame time, and " Blank " represents the time between two frames, and " Frame2 " represents back one frame time, and " G1～G2n " is a plurality of sweep signal oscillograms, and " Vn " is the gray scale voltage oscillogram that n bar data line 322 loads,
" Vcom1 " is the common electric voltage that loads on this odd column public electrode wire, and " Vcom2 " is the common electric voltage that loads on this even column public electrode wire.
The principle of work of this liquid crystal indicator 3 is described below:
Former frame as shown in figure 14 is in the time, during this multi-strip scanning line 321 is scanned successively, the gray scale voltage that this odd column data line 322 is loaded on the respective pixel electrode 37 is first gray scale voltage, and the common electric voltage of the odd column public electrode 35 relative with it is first common electric voltage.Wherein this first common electric voltage is for just and greater than this first gray scale voltage, so the display voltage of all pixels is a negative value on this odd column data line.During this multi-strip scanning line 321 was scanned successively, the gray scale voltage that this even column data line 322 is loaded on the respective pixel electrode 37 was second gray scale voltage, and the common electric voltage of the even column public electrode 35 relative with it is second common electric voltage.Wherein this second common electric voltage for negative less than this second gray scale voltage, so on this odd column data line the display voltage of all pixels be on the occasion of.After treating that the scanning of this frame picture is finished, the polarity of the display voltage that all pixels loaded is shown in Figure 15 (a) on this display panels.
Before extremely back one frame begins after this frame end, short circuit this odd column public electrode 35 and this even column public electrode 35.Because the Cs of each pixel is basic identical, Clc is also basic identical, the pixel quantity of this odd column public electrode 35,35 electrical connections of even column public electrode is identical again, so the total capacitance size that is electrically connected with this odd column public electrode 35 and this even column public electrode 35 is basic identical respectively.According to the basic electricity principle as can be known, the time long enough before if this frame end of setting begins to next frame afterwards, voltage is the mean value of first common electric voltage and second common electric voltage, i.e. intermediate value substantially on this odd column public electrode 35 and this even column public electrode 35.
In one frame time of back, during this multi-strip scanning line 321 is scanned successively, the gray scale voltage that this odd column data line 322 is loaded on the respective pixel electrode 37 is second gray scale voltage, and the common electric voltage of the odd column public electrode 35 relative with it is second common electric voltage.Wherein this second common electric voltage is for negative and less than this second gray scale voltage, thus on this odd column data line the display voltage of all pixels be on the occasion of.During this multi-strip scanning line 321 was scanned successively, the gray scale voltage that this even column data line 322 is loaded on the respective pixel electrode 37 was first gray scale voltage, and the common electric voltage of the even column public electrode 35 relative with it is first common electric voltage.Wherein this first common electric voltage is for just and greater than this first gray scale voltage, so the display voltage of all pixels is a negative value on this odd column data line.After treating that the scanning of this frame picture is finished, the polarity of the display voltage that all pixels loaded is shown in Figure 15 (b) on this display panels.
Claims (10)
1. liquid crystal indicator, it comprises:
One first substrate;
One second substrate that is oppositely arranged with this first substrate;
One is held on the liquid crystal layer between this first substrate and second substrate;
The multi-strip scanning line, it is set in parallel in the surface of this second substrate near this liquid crystal layer;
Many data lines, it is arranged on this second substrate near the surface of this liquid crystal layer and perpendicular to this sweep trace;
A plurality of public electrodes are disposed on this first substrate near the surface of this liquid crystal layer, and these a plurality of public electrodes are parallel to this sweep trace and each public electrode correspondence one scan line at least;
It is characterized in that: this liquid crystal indicator also comprises a discharge circuit, and it is arranged on the edge of this second substrate near this liquid crystal layer surface, and is connected to this public electrode, and can this public electrode of short circuit.
2. liquid crystal indicator as claimed in claim 1, it is characterized in that: the quantity of this public electrode equates with the quantity of this sweep trace and is corresponding one by one, and this odd column public electrode is electrically connected and loads first common electric voltage, and this even column public electrode is electrically connected and loads second common electric voltage.
3. liquid crystal indicator as claimed in claim 1 is characterized in that: this discharge circuit comprises a transistor, and its drain electrode is connected to this odd column public electrode, and its source electrode is connected to this even column public electrode, and grid is connected to this sequential control circuit.
4. liquid crystal display apparatus driving circuit, this liquid crystal indicator comprises many sweep traces that are parallel to each other, many the data lines vertical with this sweep trace, a plurality of public electrodes that are parallel to this sweep trace, each public electrode correspondence is the one scan line at least, and this liquid crystal display apparatus driving circuit comprises the steps:
In a frame time, this odd column public electrode loads one first common electric voltage, and this even column public electrode loads one second common electric voltage;
In time before next frame begins after this frame end, this odd column public electrode of short circuit and this even column public electrode;
In time, this odd column public electrode loads this second common electric voltage at next frame, and this even column public electrode loads this first common electric voltage;
At last, and with this two frame is the cycle to repeat above-mentioned action.
5. liquid crystal display apparatus driving circuit as claimed in claim 4, it is characterized in that: before in this two frame in the frame time, scan this sweep trace successively, when this odd column public electrode corresponding scanning beam of scanning, this data line loads one first gray scale voltage, when this even column public electrode corresponding scanning beam of scanning, this data line loads one second gray scale voltage; After in this two frame in the frame time, scan this sweep trace successively, when this odd column public electrode corresponding scanning beam of scanning, this data line loads this second gray scale voltage, when this even column corresponding scanning beam of scanning, this data line loads this first gray scale voltage; Wherein, this first common electric voltage greater than this first gray scale voltage and this second common electric voltage less than this second gray scale voltage, or this first common electric voltage less than this first gray scale voltage and this second common electric voltage greater than this second gray scale voltage.
6. liquid crystal indicator, it comprises:
One first substrate;
One second substrate that is oppositely arranged with this first substrate;
One is held on the liquid crystal layer between this first substrate and second substrate;
The multi-strip scanning line, it is set in parallel in the surface of this second substrate near this liquid crystal layer;
Many data lines, it is arranged on this second substrate near the surface of this liquid crystal layer and perpendicular to this sweep trace;
A plurality of public electrodes are disposed on the surface of this first substrate near this liquid crystal layer, and these a plurality of public electrodes are parallel to this data line and the corresponding at least one data line of each public electrode;
It is characterized in that: this liquid crystal indicator also comprises a discharge circuit, and it is arranged on the edge of this second substrate near this liquid crystal layer surface, and is connected to this public electrode, and can short circuit be somebody's turn to do the public electrode that loads different voltage.
7. liquid crystal indicator as claimed in claim 6, it is characterized in that: the quantity of this public electrode equates with the quantity of this data line and is corresponding one by one, and this odd column public electrode is electrically connected and loads first common electric voltage, and this even column public electrode is electrically connected and loads second common electric voltage.
8. liquid crystal indicator as claimed in claim 6 is characterized in that: this discharge circuit comprises a transistor, and its drain electrode is connected to this odd column public electrode, and its source electrode is connected to this even column public electrode, and grid is connected to this sequential control circuit.
9. liquid crystal display apparatus driving circuit, this liquid crystal indicator comprises many sweep traces that are parallel to each other, many the data lines vertical with this sweep trace, a plurality of public electrodes that are parallel to this data line, the corresponding at least one data line of each public electrode, this liquid crystal display apparatus driving circuit comprises the steps:
In a frame time, this odd column public electrode loads one first common electric voltage, and this even column public electrode loads one second common electric voltage;
In time before next frame begins after this frame end, this odd column public electrode of short circuit and this even column public electrode;
In time, this odd column public electrode loads this second common electric voltage at next frame, and this even column public electrode loads this first common electric voltage;
At last, and with this two frame is the cycle to repeat above-mentioned action.
10. liquid crystal display apparatus driving circuit as claimed in claim 9, it is characterized in that: before in this two frame in the frame time, this odd column public electrode corresponding data lines loads one first gray scale voltage, and this even column public electrode corresponding data lines loads one second gray scale voltage; In the frame time, this odd column public electrode corresponding data lines loads this second gray scale voltage after in this two frame, and this even column public electrode corresponding data lines loads this first gray scale voltage; Wherein, this first common electric voltage greater than this first gray scale voltage and this second common electric voltage less than this second gray scale voltage, or this first common electric voltage less than this first gray scale voltage and this second common electric voltage greater than this second gray scale voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710073200XA CN101236318B (en) | 2007-02-02 | 2007-02-02 | Liquid crystal display device and driving method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710073200XA CN101236318B (en) | 2007-02-02 | 2007-02-02 | Liquid crystal display device and driving method thereof |
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| CN101236318A true CN101236318A (en) | 2008-08-06 |
| CN101236318B CN101236318B (en) | 2010-04-21 |
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