CN101071207B - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN101071207B CN101071207B CN200610026506A CN200610026506A CN101071207B CN 101071207 B CN101071207 B CN 101071207B CN 200610026506 A CN200610026506 A CN 200610026506A CN 200610026506 A CN200610026506 A CN 200610026506A CN 101071207 B CN101071207 B CN 101071207B
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Abstract
The invention is a LCD, comprising a LCD panel as well as multiple pixels as display cells, a time controller, a gate driver and a data driver, where the data driver comprises several voltage references, several reference resistors, and several data drive cells, and it is characterized in that the data driver also comprises several voltage reference control circuits composed of several control resistors and several control switches, and these control circuits are connected to input ends of the voltage references and the circuits composed of reference resistors. By on-off of the control switches, the control circuits can raise amplitudes of the voltage references to raise output voltages of the data drive cells so as to raise display response rate of the LCD.
Description
Technical field
The present invention relates to the data drive circuit device of liquid crystal (liquid Crystal) display device, especially LCD (LCD, Liquid Crystal Display) and LCD.
Background technology
The response time of LCD is an important indicator weighing its performance, and it has reflected the reaction velocity of LCD to input signal.The response time of LCD refers to the speed of each pixel of LCD to input signal reaction, and promptly pixel is bright or by the dark needed time of bright commentaries on classics by blackout.This numerical value is more little, shows that the reaction velocity of LCD is fast more.
These parameters is brought up to 25 milliseconds from 30 milliseconds initial (ms), brings up to 12 milliseconds again, even 8 milliseconds and even littler.Theoretically, when the response time of LCD is 30ms, can be applicable to show p.s. the requirement of 1/0.030=33 frame picture, substantially can satisfy the needs that DVD plays; And when response time 25ms, can be applicable to show p.s. the requirement of 1/0.025=40 frame picture, can satisfy the demand of most of recreation; When the response time is 12ms, can be applicable to 83 frame picture requirements, and during 8ms, can rise to 125 frame pictures.Certainly, above-mentioned only is a theoretical value, often also has the loss of others in real world applications.
Iff LCD is used for common office as display screen, for example use the Office office software, perhaps with LCD as the common simulating signal program of television-viewing, so above-mentioned 30 milliseconds reaction velocity can both meet the demands substantially.But the game player is clear, and the action game that some are fierce as UT2003, DOMMIII etc., will just conditions of streaking can not occur at least to the picture display speed more than 12ms.If but wish to obtain more true to nature, picture fast, and the reaction velocity of these needed displays of playing is higher so, even has surpassed more than the 2ms, and for example recreation such as QuakeIII could give the game player with real innervation and stimulation like this.
Therefore, for LCD, improve its response time, reaction velocity is an important problem in other words.
We learn according to existing known data, say simply, the basic structure of LCD is to be provided with the liquid crystal layer with dielectric anisotropy between the panel (Polarizer) of two polarizers, can between described Polarizer, produce electric field by the external drive circuit device, liquid crystal between these electric fields and the Polarizer constitutes a plurality of so-called liquid crystal capacitors (Liquid Crystal Capacitor), these electric fields can drive the direction of each liquid crystal molecule in the liquid crystal layer simultaneously, for example, liquid crystal molecule can be turn 90 degrees by the direction dextrorotation perpendicular to Polarizer, perhaps is rotated counterclockwise 90 degree.The direction of above-mentioned liquid crystal molecule mainly is subjected to the influence of dielectric coefficient, the characteristic that on behalf of liquid crystal, this dielectric coefficient turned to by electric field effects decision liquid crystal molecule.Can determine the transmittance of whole liquid crystal layer by the direction of liquid crystal molecule, can the data-signal of outside input be shown by liquid crystal molecule according to the different transmittances of liquid crystal molecule, thereby on LCD, show image signals corresponding.In a real process, when the liquid crystal display displays image, at first by the video interface output image signal, after receiving these picture signals, the control module of LCD is transferred to the associated drives unit with these signals, thereby these driver elements produce above-mentioned electric field control liquid crystal layer output image signal again.
We learn according to existing known data equally, the process of above-mentioned liquid crystal molecule display data signal is actually to be imported a voltage signal, makes each liquid crystal molecule reach the steering angle of an appointment and produce a certain luminance till the input of voltage signal next time above-mentioned liquid crystal. and when liquid crystal molecule was charged to enough brightness, picture signal had begun to show on LCD; After this, if above-mentioned liquid crystal capacitor electric leakage, then the brightness of liquid crystal molecule weakens gradually, picture signal on the LCD is also just fuzzy gradually, the electric weight when if above-mentioned liquid crystal capacitor remains the charging end, then above-mentioned picture signal just remains unanimity. and when needs show next data-signal, then again each above-mentioned liquid crystal molecule is charged, thereby show next data-signal.
Above-mentioned known data can be with reference to numerous teaching material or patent application documents about LCD, for example application number is 200510092049.5, denomination of invention is the Chinese patent application of " Liquid Crystal Display And Method For Driving ", and for example application number is 200380103070.X, denomination of invention for Chinese patent application, the application number of " Liquid Crystal Display And Method For Driving " is 00135262.8, denomination of invention is for the Chinese patent application of " LCD, liquid-crystal controller and video-signal transmission method " etc. again.
As seen, in fact the reaction time of LCD depend on the length of the time that above-mentioned liquid crystal capacitor is charged, if being charged to enough degree, to make that liquid crystal molecule reaches time of enough brightness display data signal very short, just the time that above-mentioned liquid crystal capacitor is charged is very short, the reaction velocity of LCD is just enough fast so, otherwise the reaction velocity of LCD is just very slow.
Equally, we can learn according to prior art, the most simple and effective way that shortens the time of above-mentioned liquid crystal capacitor charging is exactly to improve the voltage that this liquid crystal capacitor is charged, it is driving voltage, in other words, this driving voltage is high more, then also can be short more to the time of above-mentioned liquid crystal capacitor charging.
For this reason, had a lot of technician that this is studied, hope can improve above-mentioned voltage rationally, easily, thereby improves the reaction velocity of LCD.For example, a lot of schemes concentrate on and increase a grayscale voltage generative circuit (Gray voltage generation circuit, also be translated into " grayscale voltage generator "), for example, (the Samsung Electronics Co. of Samsung company limited, Ltd.) denomination of invention of Ti Chuing is the United States Patent (USP) (US6 of " the grayscale voltage generative circuit (Grayvoltage generation circuit for driving a liquid crystal display rapidly) that is used for the fast driving LCD ", a solution has been proposed 670,935).Say simply, this solution data drive circuit (Source Driving Circuit) external a grayscale voltage generative circuit, this circuit can produce variable voltage, when above-mentioned liquid crystal capacitor charging is begun, above-mentioned grayscale voltage generative circuit at first produces the normal high voltage of voltage, and be maintained to above-mentioned liquid crystal capacitor charging end, then, the grayscale voltage generative circuit returns to normal voltage to stop above-mentioned liquid crystal capacitor electric leakage.By a such change procedure, just solved and above-mentioned liquid crystal capacitor has been carried out rapid charge, thereby the reaction velocity of LCD has been brought up in the acceptable scope.Based on absolute accurate measuring and calculating, the reaction velocity of using the LCD of the scheme that this United States Patent (USP) proposes is about 5 milliseconds (ms).
Above-mentioned United States Patent (USP) has in fact been done very big change to the related technical scheme of another one patented claim, be that denomination of invention is the United States Patent (USP) (US6 of " liquid crystal display (Liquid Crystal DisplayDevice) ", 930,663), comparatively speaking, the reaction velocity of LCD of technical scheme of using a back patent is about 2 milliseconds, but the area of using the circuit that this technical scheme produces is bigger, and the area of a circuit is about 4 times an of circuit area of using last patent.
Technical scheme as last United States Patent (USP), it has increased grayscale voltage generative circuit one by one outside data drive circuit, this scheme and former scheme, promptly have only data drive circuit and do not have the scheme of grayscale voltage generative circuit to compare the area that has also increased circuit, and this scheme is relatively complicated.
Summary of the invention
For this reason, the inventor has proposed a kind of technical scheme of LCD, the technical scheme of circuit especially is provided about data drive voltage wherein. this programme is still inherited above-mentioned thought, promptly in the short as far as possible time, data drive voltage is brought up to the level higher than normal data drive voltage, thereby can charge to above-mentioned so-called liquid crystal capacitor apace, and and then improve the reaction velocity of LCD. simultaneously, the present invention wishes do not increasing circuit area, or increases the reaction velocity that improves above-mentioned LCD under the situation of small size very.
A kind of LCD, comprise a liquid crystal panel, it comprises a plurality of pixels as basic display unit, one time control device is used to issue a clock signal and a plurality of control signal, a door drive, according to the described clock signal described pixel of lining by line scan continuously, and a data drive unit, producing the liquid crystal drive voltage relevant according to described control signal with data-signal, described drive unit comprises:
Several reference voltages (Vgama) input end,
Some groups of reference resistances, corresponding connection with described reference voltage input terminal is used for output reference voltage,
Several number is according to driver element, thereby input signal such as the vision signal that is used for being imported, clock signal and described reference voltage conversion back generate the data output voltage and export to described pixel and produce data input signal,
It is characterized in that, described drive unit also comprises several reference voltage control circuits, is used to control described reference voltage, and it is made up of several gauge tap at least, can also comprise several controlling resistances, and be connected in the circuit of described reference voltage input terminal and reference resistance composition.
Described reference voltage control circuit is used to control above-mentioned reference voltage, and its data output voltage according to the required output in data-driven unit is adjusted reference voltage, thereby reaches the purpose of the described data output voltage of control.Particularly, insert several controlling resistances and gauge tap in the circuit of described reference voltage input terminal and reference resistance composition according to specific annexation, closure by gauge tap, disconnect the position that changes in the reference voltage input terminal place in circuit and controlling resistance whether in the place in circuit, thereby changed reference voltage, and and then changed the data output voltage.
By circuit arrangement provided by the invention, can in process, at first provide one than higher reference voltage to described data-driven unit to so-called liquid crystal electric capacity charging, according to this than higher reference voltage, a high magnitude of voltage of the normal output voltage of ratio can be exported in described data-driven unit, thereby has accelerated the charging rate to so-called liquid crystal capacitor; Then, the brightness of keeping liquid crystal of normal output voltage of this data-driven unit output is arrived up to next signal.By the foregoing circuit device, can improve charging rate greatly, thereby improve the reaction velocity of LCD liquid crystal.And circuit arrangement provided by the invention is simple in structure, is easy to realize, and does not increase circuit area.Moreover, the present invention is easy to expand, and is very suitable for the driving circuit of various LCD.
Description of drawings
Fig. 1 is the circuit connection diagram of data driven unit in the prior art.
Fig. 2 is the circuit connection diagram that is used for describing the principle of the invention.
Fig. 3 is another circuit connection diagram that is used for describing the principle of the invention.
Fig. 4 is the circuit connection diagram of the first embodiment of the present invention.
Fig. 5 is the voltage cycle synoptic diagram of the first embodiment of the present invention.
Fig. 6 is the circuit connection diagram of the second embodiment of the present invention.
Fig. 7 is a composition synoptic diagram of using the LCD of one embodiment of the present of invention.
Label declaration
1, panel of LCD
11 pixels
2, door drive
3, time-controlling arrangement
31 clock signals
4, data drive circuit
41 reference voltage input terminals, 42 reference resistances
43 reference voltages, 44 data-driven unit
45 output voltages, 46 reference voltage control circuits
461 controlling resistances, 462 gauge tap
51 clock signal sequences
52 former output voltage sequences
521 forward output voltages, 522 reverse output voltages
Output voltage sequence after 52 ' raising
Forward output voltage after 521 ' raising
53 is the gate signal sequence of n group
53 ' be the gate signal sequence of n+1 group
53 " be the gate signal sequence of n+2 group
53 " ' be the gate signal sequence of n+3 group
Embodiment
With reference to figure 1, it has described the circuit connection diagram of data driven unit described in the prior art.As shown in Figure 1, reference voltage input terminal 41 has schematically drawn, reference voltage input terminal Vgama1～reference voltage input terminal Vgama2 for example, but the number that those skilled in the art will recognize that reference voltage input terminal is to require according to the specific design of above-mentioned data driven unit to change.Correspondingly, some groups of resistance 42 have been shown among Fig. 1, are provided with one group of reference resistance 42 between per two reference voltage input terminals 41, those skilled in the art is appreciated that equally, this constant resistance 42 can be an independently resistance, also can be one group of resistance that several resistance are formed.And correspondingly, under the acting in conjunction of voltage that reference voltage input terminal 41 is imported and reference resistance 42, export reference voltage 43, for example under the acting in conjunction of reference voltage input terminal Vgama1, reference resistance 42 and reference voltage input terminal Vgama2, exported reference voltage V1.
Above-mentioned reference voltage 43 is as an input of described data-driven unit 44, simultaneously, signals such as vision signal, clock signal 51 are also as the input signal of above-mentioned data-driven unit 44, and through formation data output voltage 45 after the processing of above-mentioned data-driven unit 44, thereby finally this data output voltage 45 will be exported to described pixel 11 generation data input signals.
Just as described in the background art, we wish to make on the basis of the described circuit of Fig. 1 above-mentioned data output voltage giving the pixel 11 that it connected, reach when being the charging of so-called liquid crystal capacitor one enough big and above the voltage of normal output voltage, shortening is to the time of capacitor charging, thereby the feasible liquid crystal of forming pixel can reach the brightness that needs apace.For this reason, in conjunction with Fig. 2 principle of the present invention is described.
With reference to figure 2, it has described the circuit connection diagram of the principle of the invention.Compared to Figure 1, Fig. 2 has increased by one first reference voltage control circuit 46
1With one second reference voltage control circuit 46
2, second reference voltage control circuit 46
2Access between above-mentioned reference voltage input terminal 41 (Vgama1) and resistance R 2, first reference voltage control circuit 46
1Access is between above-mentioned reference voltage input terminal 41 (Vgama2) and resistance R n.With reference to figure 2, the first reference voltage control circuits 46
1Comprise first controlling resistance 461
1And first gauge tap 462
1, and first gauge tap 462
1With first controlling resistance 461
1Be series between reference voltage input terminal 41 (Vgama2) and the reference resistance 42 (Rn) second reference voltage control circuit 46 after the parallel connection again
2Comprise second gauge tap 462
2, and second gauge tap 462
2(R1) is in parallel with reference resistance 42, and an end of this parallel circuit is connected with above-mentioned reference voltage input terminal Vgama1, and the other end is connected with reference resistance R2.
With reference to figure 2, in foregoing circuit, described reference voltage input terminal 41 does not change, and all reference resistances 42 do not change yet, but can be by the described reference voltage control circuit 46 of control so that described reference voltage 43 changes to some extent, promptly reference voltage 43 as shown in Figure 2 '.
With reference to figure 2, when first gauge tap 462
1Disconnect second gauge tap 462
2When closed:
V2 '=(R3+R4...Rn+Rn ')/(R2+R3+.....+Rn+Rn ') * (Vgama1-Vgama2)+Vgama2, at this moment, these reference voltage control circuit operate as normal.
And when first gauge tap 462
1Closure, second gauge tap 462
2During disconnection:
V2＝(R3+R4...Rn-1+Rn)/(R1+R2..+Rn-1+Rn)×(Vgama1-Vgama2)+Vgama2
As seen, be controlled under a certain proportion of prerequisite at R1 ' and Rn ', the reference voltage 43 in the time of can guaranteeing reference voltage control circuit work changes, i.e. V2 '＞V2.For example, under the R1 situation equal with Rn ', the reference voltage V2 ' under above-mentioned first kind of situation is higher than second kind of reference voltage V2 under the situation, and the voltage under second kind of situation equates with the value of reference voltage shown in Figure 1.And for example, when R1＞Rn ', can guarantee to exist the result of above-mentioned V2 '＞V2 equally.Therefore, by controlling reference voltage control circuit shown in Figure 2, the output that has in fact formed reference voltage under first kind of situation is than higher, but the situation that output voltage equates with normal value under second kind of situation.It will be appreciated by those skilled in the art that, just can control the numerical value of the reference voltage under above-mentioned two kinds of situations by the resistance value of adjusting above-mentioned reference resistance Rn ', when the reference voltage V2 ' when making the work of above-mentioned reference voltage control circuit is higher than these reference voltage control circuits and does not work, the i.e. certain ratio of reference voltage V2 in normal circuit, particular content can be with reference to the description about Fig. 5.
Be appreciated that when first kind of situation from above-mentioned description those skilled in the art, in fact just to the process of the liquid crystal charging of forming above-mentioned pixel 11, at this moment, export one than higher voltage, make that liquid crystal can rapid charge, thereby improved its response speed.And under second kind of situation, when the liquid crystal charging is finished, in the time of will keeping a fixed voltage to liquid crystal, high voltage when no longer needing to charge, so export a normal voltage, to keep liquid crystal can not leak electricity, the state consistency when promptly keeping its brightness and finishing with charging arrives thereby make LCD can normally show up to next data-signal.
With reference to figure 3, it has described another circuit connection diagram of the principle of the invention.Compared to Figure 1, Fig. 2 has also increased by two reference voltage control circuits 46, is respectively 46
1, 46
2, wherein, above-mentioned the 3rd reference voltage control circuit 46
1' comprise the 3rd gauge tap 462
1', the 5th gauge tap 462
3' and the 6th gauge tap 462
4', and be basic point with Vgama2, above-mentioned the 6th gauge tap 462
4' with reference resistance Rx, Rn and some resistance therebetween and the 5th gauge tap 462
3' the series circuit parallel connection, reference voltage input terminal 41 (Vgama3) and the 3rd gauge tap 462
1Connect with this parallel circuit again after the ' series connection; Equally, be basic point with Vgama3, above-mentioned the 6th gauge tap 462
4' with the 5th gauge tap 462
3In parallel with reference resistance Rx, Rn and some resistance therebetween again after ' the series connection, an end of this parallel circuit again with above-mentioned the 3rd gauge tap 462
1', reference voltage input terminal 41 (Vgama3) series connection, the other end is connected with reference resistance Rx-1.Above-mentioned the 4th reference voltage control circuit 46
2' comprise the 4th gauge tap 462
2', the 4th gauge tap 462
2' in parallel with reference resistance 42 (R1), an end of this parallel circuit is connected with above-mentioned reference voltage input terminal Vgama1, and the other end is connected with reference resistance R2.
With reference to figure 3, in foregoing circuit, same, described reference voltage input terminal 41 does not change, all reference resistances 42 do not change yet, but can be so that described reference voltage 43 changes to some extent by controlling described reference voltage control circuit 46, promptly reference voltage 43 as shown in Figure 3 '.
With reference to figure 3, when the 3rd gauge tap 462
1' disconnect the 4th gauge tap 462
2' closure, the 5th gauge tap 462
3' disconnect the 6th gauge tap 462
4During ' closure:
V2′＝(R3+R4...Rn-1+Rn)/(R2+R3+.....+Rn-1+Rn)×(Vgama1-Vgama2)+Vgama2
And when the 3rd gauge tap 462
1' closure, the 4th gauge tap 462
2' disconnect the 5th gauge tap 462
3' closure, the 6th gauge tap 462
4' when disconnecting:
V2＝(R3+R4...Rn-1+Rn)/(R1+R2..+Rn-1+Rn)×(Vgama1-Vgama3)+Vgama3
Because Vgama2＞Vgama3, and according to analysis at above-mentioned Fig. 2, can reach a conclusion equally, be higher than reference voltage under this second kind of situation, and the voltage under second kind of situation equates with the value of reference voltage shown in Figure 1 at the reference voltage V2 ' under this first kind of situation.Therefore, by controlling reference voltage control circuit shown in Figure 3, the output that has in fact formed reference voltage under first kind of situation is than higher, but the situation that output voltage equates with normal value under second kind of situation.
Equally, be appreciated that when first kind of situation from above-mentioned description those skilled in the art, in fact just the process that the liquid crystal of forming above-mentioned pixel is charged at this moment, is exported one and is compared higher voltage, make that liquid crystal can rapid charge, thereby improved its response speed.And under second kind of situation, when the liquid crystal charging is finished, in the time of will keeping a fixed voltage to liquid crystal, high voltage when no longer needing to charge, so export a normal voltage, to keep liquid crystal can not leak electricity, the state consistency when promptly keeping its brightness and finishing with charging arrives thereby make LCD can normally show up to next data-signal.
Above-mentioned Fig. 2, Fig. 3 have described the principle of circuit arrangement provided by the present invention, but it will be appreciated by those skilled in the art that, to with circuit application provided by the invention in the available LCD of reality, also must be used in conjunction with the actual display that uses.For example, will there be 128 pixel cells in the delegation of a common LCD, just needs the corresponding driving circuit and is cooperated, and further describes the present invention below in conjunction with embodiment.
With reference to figure 4, it has described the circuit connection diagram of the first embodiment of the present invention.In the present embodiment, circuit arrangement provided by the invention is applied in the control circuit of LCD of a reality.With reference to figure 4, in the present embodiment, the driving circuit of above-mentioned LCD comprises reference voltage input terminal 41, i.e. Vgama8, Vgama14.Correspondingly, with reference to figure 4, before using the present invention, comprise reference resistance 42 in the above-mentioned driving circuit, be R1～R64, the other end of this reference voltage is connected to a data-driven unit 44 and as the input voltage of this data-driven unit 44, simultaneously, signals such as vision signal, clock signal 51 are also as the input signal of this data-driven unit 44, handle back output one output voltage 45 through data-driven unit 44, this output voltage 45 will be as the input voltage of a liquid crystal of the component units of LCD.
With reference to figure 4, in the present embodiment, the present invention has inserted reference voltage control circuit 46 under the prerequisite that keeps above-mentioned driving circuit structure
3And 46
4, wherein, reference voltage control circuit 46
3Comprise a controlling resistance 461
3, i.e. R64 ', and gauge tap 462
3, 462
3', and gauge tap 462
3With controlling resistance 461
3And gauge tap 462
3' the series circuit parallel connection after be serially connected with reference voltage input terminal 41 again, i.e. Vgama8 and reference resistance 42 are promptly between the R64; Reference voltage control circuit 46
4 Comprise gauge tap 462
4, gauge tap 462
4', and gauge tap 462
4' with after reference resistance R1 connects again with gauge tap 462
4Parallel connection, and then be serially connected with reference voltage input terminal 41, i.e. Vgama14 and reference resistance 42 are promptly between the R2.
By inserting above-mentioned reference voltage control circuit 46
3And 46
4, can specifically control the value of input voltage 43, concrete operations are as follows.With reference to figure 4, when gauge tap 462
4Disconnection, gauge tap 462
4' closure, gauge tap 462
3Closed, gauge tap 462
3' when disconnecting, at this moment, circuit shown in Figure 4 is equivalent to not connect reference voltage control circuit 46 provided by the present invention
3And 46
4, be the driving circuit of the LCD of institute's practical application in the prior art.And when gauge tap 462
4Closed, gauge tap 462
4' disconnect gauge tap 462
3Disconnection, gauge tap 462
3' when closed, promptly above-mentioned reference resistance R1 does not insert above-mentioned driving circuit, and above-mentioned controlling resistance R64 ' inserts above-mentioned driving circuit, this moment reference voltage V2 ', promptly as follows with reference to the reference voltage between R2 and the R3:
V2′＝(R3+R4+...+R64+R64′)/(R2+R3+...+R64+R64′)×(Vgama14-Vgama8)+Vgama8
Similarly, reference voltage V3 ', promptly as follows with reference to the reference voltage between R3 and the R4:
V3′＝(R4+...+R64+R64′)/(R2+R3+...+R64+R64′)×(Vgama14-Vgama8)+Vgama8
With reference to explanation, those skilled in the art will appreciate that when reference voltage control circuit 46 to Fig. 2
3And 46
4Reference voltages such as reference voltage V2 ', the V3 ' during work, V4 ' all are higher than these reference voltage control circuits when not working, i.e. the magnitude of voltage of normal reference voltage.Also, make the LCD of using present embodiment charge apace like this as the explanation of Fig. 2, Fig. 3.
With reference to figure 4, Vgama8 and Vgama14 wherein only are shown, but those skilled in the art will appreciate that at present in the driving circuit of a practical application, it also comprises Vgama9～Vgama13, for example PHILIPS Co. produce 150S4,170S4 series LCD.Those skilled in the art will appreciate that generally speaking in above-mentioned driving circuit, Vgama13 is connected between resistance R 8 and the R9, by that analogy, Vgama9 is located between resistance R 56 and the R57 or the like.Those skilled in the art can with reference to figure 2, Fig. 3 and above-mentioned explanation to Fig. 4 calculates under the situation that has reference voltage control circuit and reference voltage during corresponding reference voltage control circuit operate as normal, and and then can judge that these reference voltages all are higher than the reference voltage when not having above-mentioned reference voltage control circuit.Reason is the same, does not give unnecessary details at this.
With reference to figure 4, in the present embodiment, gauge tap 462 in this circuit
3, 462
3', 462
4, 462
4' wait to be transmission gate circuit (pass-gate).With reference to figure 5, in clock gate signal 51 during for just (height), gauge tap 462
4Closed, gauge tap 462
4' disconnect gauge tap 462
3Disconnection, gauge tap 462
3' closure, promptly Ci Shi reference voltage is higher than normal reference voltage; And when clock signal 51 was negative (low), then gauge tap 462
4Disconnection, gauge tap 462
4' closure, gauge tap 462
3Closed, gauge tap 462
3' disconnecting, this moment, then reference voltage was in normal level.At this moment, reference voltage V2, the input voltage between reference resistance R2 and the R3 is as follows:
V2＝(R3+R4+...+R64)/(R1+R2+R3+...+R64)×(Vgama14-Vgama8)+Vgama8
Similarly, reference voltage V3, promptly as follows with reference to the reference voltage between R3 and the R4:
V3＝(R4+...+R64)/(R1+R2+R3+...+R64)×(Vgama14-Vgama8)+Vgama8
The rest may be inferred, can calculate the value of all reference voltages 43 in these cases.As seen, the value of all reference voltages 43 is to be consistent during with the situation that do not have reference voltage control circuit 46 to insert in this case, promptly equate with the value of reference voltage 43 under the prior art situation, and all reference voltages 43 under last a kind of situation ' value greater than the prior art situation under the value of reference voltage 43.It will be appreciated by those skilled in the art that, a kind of mode of operation like this, just formed in the process that the liquid crystal of forming LCD is charged, above-mentioned data-driven unit 44 can obtain a high relatively reference voltage 43 ', thereby improved the output voltage 45 of this data-driven unit 44 ' and then shortened duration of charging to liquid crystal, and after charging is finished, then return to normal reference voltage 43, thereby realized the rapid reaction of LCD.
In the present embodiment, control the automatic switchover of above-mentioned reference voltage control circuit by transmission gate switch, and those skilled in the art also is appreciated that, in other embodiments, also can realize automatic switchover, as long as switch back normal reference voltage again after guaranteeing after reference voltage arrives certain magnitude of voltage, to keep one section process that is enough to above-mentioned liquid crystal charging by other circuit to these reference voltage control circuits.
In the present embodiment, above-mentioned controlling resistance is a polysilicon, and the resistance summation of controlling resistance is between 10K～20K.And in other embodiments, the resistance summation of above-mentioned controlling resistance also can be in other scopes.
Those skilled in the art will appreciate that the resistance that is used in the chip circuit all can be used as above-mentioned controlling resistance, for example, in another embodiment, above-mentioned controlling resistance has adopted diffusion region formula resistance.The selection of resistance does not influence flesh and blood of the present invention.
In fact, in the control circuit of above-mentioned practical application, also comprise another group circuit with circuit symmetrical shown in Figure 4, wherein reference voltage input terminal is from Vgama1～Vgama7, reference resistance is from R65～R128, those skilled in the art can be implemented above-mentioned circuit shown in Figure 4 at this symmetric circuit similarly, thereby constitutes a specific embodiment to the driving circuit of the LCD of practical application.
For above-mentioned process to the liquid crystal rapid charge is described better, further specify the process that improves the LCD reaction velocity in one embodiment of the invention below in conjunction with Fig. 5.With reference to figure 5, it has described voltage timing diagram in one embodiment of the invention.With reference to figure 5, sequence 51 is clock signal (Gate Clock), the control signal that promptly described clock control device 3 produces, and this signal is as an output voltage 45 of importing and be used for control Driver Circuit 4 generations of described liquid crystal display drive circuit 4.The output voltage 45 that sequence 52 produces under the clock signal shown in the sequence 51 for above-mentioned liquid crystal display drive circuit 4 in the prior art, correspondingly, the output voltage 45 of sequence 52 ' produced for the liquid crystal display drive circuit 4 of an embodiment using control circuit provided by the invention '.Sequence 53 is the sequence of the gate signal of n group pixel, correspondingly, sequence 53 ' be the gate signal sequence of n+1 group pixel, sequence 53 " being the gate signal sequence for n+2 group pixel, sequence 53 " ' organize the gate signal sequence of pixel etc. for n+3.It will be appreciated by those skilled in the art that, above-mentioned sequence only is the clock signal sequence relation of the length of a LCD in operation process, because it has periodically, so be appreciated that the clock signal sequence relation of other times in the cycle according to sequence relation shown in Figure 6.
With reference to figure 5, clock signal be first cycle during, at this moment, the conducting of n group pixel, be that data drive circuit 4 provides data-signal to n group pixel, that is the capable liquid crystal of n charged and make corresponding so-called liquid crystal electric capacity sustaining voltage and leakproof, at this moment, the gate signal sequence of n group is shown in 53 sequences.Correspondingly, clock signal be second round during, during promptly next clock signal, then n+1 group pixel conducting, the rest may be inferred.
With reference to figure 5, under the prior art situation, the output voltage of above-mentioned data driven unit 4 is shown in sequence 52.Wherein, in first clock signal period, this data driven unit 4 provides forward output voltage 521, in second clock signal period, this data driven unit 4 provides reverse output voltage 522, repeated forward output voltage 521 once more then in next clock signal period.
With reference to figure 5, then variation has taken place in the output voltage that provides of data driven unit 4 in having used an embodiment of voltage control circuit provided by the invention, as sequence 52 ' shown in. in first above-mentioned clock signal period, in at first during first section, forward output voltage 521 ' be enhanced, and in during second section, then forward output voltage 521 returns to the forward output voltage 521 shown in sequence 52, be the forward output voltage under the prior art situation. again with reference to figure 6, still as sequence 52 ' shown in, in second above-mentioned clock signal period, still in during first section, oppositely output voltage is increased substantially, and in during second section, then reverse output voltage returns to the reverse output voltage shown in sequence 52, i.e. reverse output voltage under the prior art situation. in next clock signal period, repeat the output voltage in first clock signal period once more, the rest may be inferred.
With reference to figure 5, above-mentioned forward output voltage 521 ' be enhanced what amplitude does not influence flesh and blood of the present invention, and can decide according to concrete application.Generally speaking, this voltage can be enhanced 2%～10%, but this scope is not the restriction to content of the present invention.For example, ceiling voltage for reference voltage input terminal 41 is the LCD of the STN type of 11.8V, wherein all pixels, the needed output voltage of above-mentioned in other words liquid crystal also not exclusively equates, with wherein maximum output voltage is example, if by reference voltage control circuit provided by the invention this output voltage is improved 10%, so the reaction velocity of Dui Ying pixel is promptly brought up to 5 milliseconds from 8 milliseconds, that is to say that the reaction velocity of whole LCD is brought up to 5 milliseconds.The raising ratio of the output voltage of foregoing description only is one gives an example, and does not constitute the restriction to content of the present invention.Those skilled in the art will appreciate that as long as output voltage 521 ' finally be enhanced that for whole LCD, it just can improve display speed so, thereby realizes purpose of the present invention.
Again with reference to figure 5, those skilled in the art will appreciate that running, can be implemented in the process that liquid crystal is charged according to control circuit shown in Figure 5, make the output voltage of above-mentioned data driven unit 4 be enhanced significantly, thereby make liquid crystal to be recharged apace.From the display effect of LCD, then the speed of displaying contents is increased substantially.
With reference to figure 6, it has described the circuit connection diagram of the second embodiment of the present invention.Circuit purpose of connecting shown in Figure 6 is still identical with circuit connection shown in Figure 4, promptly comes the variation of control output voltage 45 to improve the reaction velocity of LCD by inserting reference voltage control circuit 46 under the situation that does not change reference voltage input terminal 41.But different with Fig. 4 is the circuit connection structure difference that both are concrete.
With reference to figure 6, on the basis of existing liquid crystal display drive circuit 4, several reference voltage control circuits have been inserted in the present embodiment.Figure 6 illustrates Wucan and examine voltage control circuit 46
5, the 6th reference voltage control circuit 46
6, the 7th reference voltage control circuit 46
7, the 8th reference voltage control circuit 46
8, etc., although and those skilled in the art will appreciate that and only show above-mentioned reference voltage control circuit 46 among Fig. 6
5～46
8, and reference resistance R1～R18, but in actual applications, can also comprise more reference resistance and corresponding reference voltage control circuit.
With reference to figure 6, in the present embodiment, when the 8th gauge tap 462
6Disconnect the 9th gauge tap 462
6During ' closure, 462
7Disconnection, 462
7' when closed, at this moment, between reference resistance R5～R16 reference voltage all with normally reference voltage is identical, in conjunction with explanation, those skilled in the art will appreciate that this is equivalent to not insert these reference voltage control circuits to prior figures 2～Fig. 4.And when the 8th gauge tap 462
6Closed, the 9th gauge tap 462
6' when disconnecting, 462
7Closure, 462
7' when disconnecting, then the reference voltage between reference resistance R11 and the R12 is as follows:
V12′＝(R12...+R15+R16)/(R10+R11+R12...+R15+R16)×(Vgama2-Vgama3)+Vgama3
And normal reference voltage is as follows:
V12＝(R12...+R15+R16)/(R10+R11+R12...+R15+R16)×(Vgama3-Vgama4)+Vgama4
Those skilled in the art will appreciate that owing to Vgama3＞Vgama4, thus inevitable understanding easily, V12 '＞V12, thus just realized also that therefore the raising reference voltage improves the purpose of output voltage 45.Similarly, those skilled in the art can infer the variation of other reference voltages, does not give unnecessary details at this.
Be appreciated that by Fig. 4, embodiment shown in Figure 6, based on summary of the invention provided by the invention the purpose that different embodiment and can realizing improves the reaction velocity of LCD can be proposed. beyond above-mentioned Fig. 4, circuit shown in Figure 6 connect, those skilled in the art can also make different changes on the basis that does not change flesh and blood of the present invention, and these are all within the scope of the present invention.
With reference to figure 7, its integral body has been described the composition synoptic diagram of using the LCD of one embodiment of the present of invention.LCD comprises a liquid crystal panel 1, it is by a plurality of pixels 11 as basic display unit, be that so-called liquid crystal capacitor is formed, also comprise a door drive 2, a time control device 3 and a data drive circuit 4, wherein used circuit arrangement provided by the invention in the data drive circuit 4.Particularly, this data drive circuit 4 is except comprising that several reference voltage input terminals 41, several reference resistances 42, several number are according to the driver element 44, also comprise several reference voltage control circuits 46, and this reference voltage control circuit 46 comprises several controlling resistances 461 and gauge tap 462 etc.Connect about the circuit of reference voltage control circuit 46, can be with reference to figure 4, embodiment shown in Figure 6.
Although the present invention is illustrated with aforesaid preferred embodiment, but the foregoing description is not to be used for limiting the present invention, any technician that this field is familiar with, enlightenment according to design philosophy of the present invention, concrete summary of the invention and embodiment, should various changes and adjustment, and by these changes with adjust resulting new content and should be contained by content of the present invention.
Claims (16)
1. LCD, comprise a liquid crystal panel (1), it comprises a plurality of pixels as basic display unit (11), one time control device (3) is used to issue a clock signal (31) and a plurality of control signal, a door drive (2), according to the described clock signal described pixel (11) of lining by line scan continuously, and a data drive unit (4), producing the liquid crystal drive voltage relevant according to described control signal with data-signal, described drive unit (4) comprising:
Several reference voltage input terminals (41), described several reference voltage input terminals comprise first reference voltage input terminal and second reference voltage input terminal,
Some groups of reference resistances (42), with the corresponding connection of described reference voltage input terminal (41), and acting in conjunction output reference voltage (43), described some groups of reference resistances comprise first reference resistance and second reference resistance,
Several number is according to driver element (44), and the vision signal, clock signal input signal and described reference voltage (43) the conversion back that are used for being imported generate data output voltages (45) and export to described pixel (11) thereby the generation data input signal,
It is characterized in that,
Described drive unit (4) also comprises several reference voltage control circuits (46), it comprises several gauge tap (462) at least, and be connected in the circuit of described reference voltage input terminal (41) and reference resistance (42) composition, the position in described reference voltage input terminal (41) place in circuit is controlled in closure, disconnection by described several gauge tap (462), and then controls the variation of described reference voltage (43).
2. LCD as claimed in claim 1 is characterized in that, described reference voltage control circuit (46) also comprises several controlling resistances (461).
3. LCD as claimed in claim 1 is characterized in that, described drive unit (4) comprises one first reference voltage control circuit (46
1) and one second reference voltage control circuit (46
2), wherein, described first reference voltage control circuit (46
1) comprise one first controlling resistance (461
1) and one first gauge tap (462
1), and described first controlling resistance (461
1) and described first gauge tap (462
1) be serially connected with between described second reference voltage input terminal (41) and second reference resistance (42) described second reference voltage control circuit (46 again after the parallel connection
2) comprise one second gauge tap (462
2), and described second gauge tap (462
2) in parallel with first reference resistance (42).
4. LCD as claimed in claim 3 is characterized in that, when described first gauge tap (462
1) disconnect, described second gauge tap (462
2) when closed, described reference voltage is higher than described first gauge tap (462
1) closed, described second gauge tap (462
2) reference voltage when disconnecting.
5. LCD as claimed in claim 1 is characterized in that, described drive unit (4) comprises one the 3rd reference voltage control circuit (46
1') and one the 4th reference voltage control circuit (46
2'), wherein, described the 3rd reference voltage control circuit (46
1') comprise the 3rd gauge tap (462
1'), the 5th gauge tap (462
3'), the 6th gauge tap (462
4'), and described the 5th gauge tap (462
3') with after several reference resistances (42) are connected again with described the 6th gauge tap (462
4') parallel connection, this parallel circuit is serially connected with second reference voltage input terminal (41) and described the 3rd gauge tap (462 again
1') and the series circuit formed of the 3rd reference voltage input terminal (41) between; Described the 4th reference voltage control circuit (46
2') comprise the 4th gauge tap (462
2'), and described the 4th gauge tap (462
2') in parallel with first reference resistance (42).
6. LCD as claimed in claim 5 is characterized in that, when described the 3rd gauge tap (462
1') disconnect, described the 4th gauge tap (462
2') closed, described the 5th gauge tap (462
3') disconnect, described the 6th gauge tap (462
4') when closed, described reference voltage is higher than described the 3rd gauge tap (462
1') closed, described the 4th gauge tap (462
2') disconnect, described the 5th gauge tap (462
3') closed, described the 6th gauge tap (462
4') reference voltage when disconnecting.
7. LCD as claimed in claim 1 is characterized in that, described drive unit (4) comprises that a Wucan examines voltage control circuit (46
5) and several the 6th reference voltage control circuits (46
6), wherein, described Wucan is examined voltage control circuit (46
5) comprise one second controlling resistance (461
5) and one the 7th gauge tap (462
5), and described second controlling resistance (461
5) and described the 7th gauge tap (462
5) be serially connected with again between described first reference voltage input terminal (41) and first reference resistance (42) after the parallel connection; Described the 6th reference voltage control circuit (46
6) comprise the 8th gauge tap (462
6) and the 9th gauge tap (462
6'), and described the 9th gauge tap (462
6') with after several reference resistances (42) are connected again with described the 8th gauge tap (462
6) parallel connection, this parallel circuit is serially connected with between second reference voltage input terminal (41) and another the 6th reference voltage control circuit again.
8. LCD as claimed in claim 7 is characterized in that, when described the 8th gauge tap (462
6) closed, described the 9th gauge tap (462
6') when disconnecting, described reference voltage is higher than described the 8th gauge tap (462
6) disconnect, described the 9th gauge tap (462
6') reference voltage when closed.
9. as each the described a kind of LCD in claim 1 and 3～8, it is characterized in that described gauge tap (462) changes closure, off-state according to the variation of clock signal (31).
10. as each the described LCD in claim 1 and 3～8, it is characterized in that described gauge tap (462) is a transmission gate circuit.
11., it is characterized in that described controlling resistance is a diffusion region formula resistance as claim 2 or 3 or 5 or 7 described LCD.
12., it is characterized in that described controlling resistance is a polysilicon as claim 2 or 3 or 5 or 7 described LCD.
13. a method that improves LCD to the reaction velocity of input signal improves output voltage to the liquid crystal of forming LCD by reference voltage control circuit, comprises the steps:
Step 1, data driven unit receives input signal;
Step 2 is controlled the closure state of the gauge tap in the above-mentioned reference voltage control circuit according to above-mentioned input signal, changes the on-position of reference voltage input terminal in the data driven unit circuit, makes output voltage be higher than normal output voltage;
Step 3 is kept above-mentioned state and is changed up to above-mentioned input signal;
Step 4, closure state according to the gauge tap in the corresponding change reference voltage control circuit of above-mentioned input signal, make the on-position of above-mentioned reference voltage input terminal in the data driven unit circuit return to the situation of described data driven unit circuit when not inserting above-mentioned reference voltage control circuit, make output voltage equal normal output voltage;
Step 5 is kept above-mentioned state up to receiving next input signal, changes step 1.
14. raising LCD as claimed in claim 13 is characterized in that to the method for the reaction velocity of input signal described input signal is a clock signal.
15. raising LCD as claimed in claim 13 is to the method for the reaction velocity of input signal, it is characterized in that, in above-mentioned steps, when changing the on-position of reference voltage input terminal in the data driven unit circuit, go back whether place in circuit of reference resistance in the control data drive unit circuit and the controlling resistance in the reference voltage control circuit.
16. as claim 13 or 15 described raising LCD method to the reaction velocity of input signal, it is characterized in that, described gauge tap is a transmission gate circuit, and described gauge tap changes closure, off-state according to the variation of input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610026506A CN101071207B (en) | 2006-05-12 | 2006-05-12 | Liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610026506A CN101071207B (en) | 2006-05-12 | 2006-05-12 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101071207A CN101071207A (en) | 2007-11-14 |
| CN101071207B true CN101071207B (en) | 2010-05-12 |
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| CN113409732B (en) * | 2021-06-30 | 2022-08-02 | 惠州华星光电显示有限公司 | Drive circuit and drive method of drive circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4804951A (en) * | 1984-11-06 | 1989-02-14 | Canon Kabushiki Kaisha | Display apparatus and driving method therefor |
| US5796379A (en) * | 1995-10-18 | 1998-08-18 | Fujitsu Limited | Digital data line driver adapted to realize multigray-scale display of high quality |
| US6567062B1 (en) * | 1999-09-13 | 2003-05-20 | Hitachi, Ltd. | Liquid crystal display apparatus and liquid crystal display driving method |
-
2006
- 2006-05-12 CN CN200610026506A patent/CN101071207B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4804951A (en) * | 1984-11-06 | 1989-02-14 | Canon Kabushiki Kaisha | Display apparatus and driving method therefor |
| US5796379A (en) * | 1995-10-18 | 1998-08-18 | Fujitsu Limited | Digital data line driver adapted to realize multigray-scale display of high quality |
| US6567062B1 (en) * | 1999-09-13 | 2003-05-20 | Hitachi, Ltd. | Liquid crystal display apparatus and liquid crystal display driving method |
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