CN104599644A - Equalization method and driving device thereof - Google Patents
Equalization method and driving device thereof Download PDFInfo
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- CN104599644A CN104599644A CN201310528636.9A CN201310528636A CN104599644A CN 104599644 A CN104599644 A CN 104599644A CN 201310528636 A CN201310528636 A CN 201310528636A CN 104599644 A CN104599644 A CN 104599644A
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Abstract
The invention discloses an equalization method and a driving device thereof. The equalization method is used for a driving device, and comprises the steps of judging whether the polarity of an output voltage of the driving device is the same within a first time interval and a second time interval according to a reverse mode of a display system coupled to the driving device, thereby generating a polarity reversing signal, and deciding whether or not to performing an equalization operation on the output voltage within a switching interval between the first time interval and the second time interval according to the polarity reverting signal, a current data wire message and an advanced data wire message.
Description
Technical field
The present invention relates to a kind of equalization method and the drive unit thereof that can reduce power consumption, particularly relate to a kind of can operation according to the gradeization in the reversing mode accessory drive of drive unit, thus reduce equalization method and the drive unit thereof of power consumption.
Background technology
LCDs (Liquid Crystal Display, LCD) has that external form is frivolous, Low emissivity, volume are little and the advantage such as low power consuming, is widely used on the information product such as mobile computer or flat-surface television.Therefore, LCDs replaces traditional CRT display screen (Cathode Ray TubeDisplay) gradually becomes the market mainstream, wherein most popular with active matrix thin film transistor liquid crystal display screen (ActiveMatrix TFT LCD) again.In simple terms, the drive system of active matrix thin film transistor liquid crystal display screen is made up of time schedule controller (Timing Controller), source electrode driver (Source Driver) and gate drivers (Gate Driver).Source electrode driver and gate drivers control data line (Data Line) and sweep trace (Scan Line) respectively, it mutually intersects to form circuit unit matrix on panel, and each circuit unit (Cell) comprises liquid crystal molecule and transistor.The displaying principle of LCDs is the grid that sweep signal is first delivered to transistor by gate drivers, make transistor turns, then after the data that time schedule controller is sent here by source electrode driver convert output voltage to, output voltage is delivered to the source electrode of transistor, now the voltage of liquid crystal one end can equal the voltage of transistor drain, and change the angle of inclination of liquid crystal molecule according to drain voltage, and then change the object that transmittance reaches display different colours.
In existing source electrode driver, precharge (pre-charge) and charge share (charge sharing) etc. are changed (Equalization) and are operated and be often used to reduce the power consumption consumed when driving LCDs.In order to reach best power saving effect, source electrode driver adopts different power saving modes except needing according to the type of drive of LCDs and reversing mode, and source electrode driver also needs to operate according to gradeizations in the output voltage control source electrode driver of source electrode driver.The type of drive of LCDs comprises direct current (DC) bias type of drive and AC bias type of drive.Further, direct current (DC) bias type of drive and AC bias type of drive have the multiple reversing mode such as line reversion (line inversion), frame reversion (frame inversion), some reversion (dot inversion), multi-point reverse (multi-dot inversion), row reversion (column inversion) separately.Wherein, the variation characteristic of the output voltage of source electrode driver can change according to different reversing mode.Therefore, gradeizations how controlled in source electrode driver according to the variation characteristic of the output voltage of source electrode driver adaptively operates to become in industry an important problem.
Summary of the invention
Given this, the present invention proposes a kind of equalization method and the drive unit thereof that are applicable to the various reversing mode of liquid crystal screen display, with the power consumption of optimization source electrode driver, and alleviates the burden of deviser.
The present invention discloses a kind of equalization method, for a drive unit, comprise the reversing mode according to the display system being coupled to this drive unit, judge whether the polarity of an output voltage of this drive unit is identical with in one second time interval in a very first time interval, to produce a polarity inversion signal; And according to this polarity inversion signal, a current data line information and a past data line information, determine that whether between this very first time interval and this second time interval, performing first in an impulsive to this output voltage operates.
The present invention also discloses a kind of drive unit, and for a display system, this drive unit comprises a driver module, is used for, according to a current data line information, producing an output voltage; And first module, comprise a polarity judging unit, be used for, according to a reversing mode of this display system, judging the polarity of this output voltage with whether different during second time interval in a very first time interval, to produce a polarity inversion signal; One judging unit, is coupled to this polarity judging unit, is used for according to this polarity inversion signal, this current data line information and a past data line information, produces first control signal and a reset signal; And first unit, be coupled to this driver module and this judging unit, be used for changing control signal and this reset signal according to these, determine whether in this very first time interval and in an impulsive, first is performed to this output voltage between this second time interval and operate.
According to technique scheme, the present invention at least has following advantages and beneficial effect compared to prior art: the present invention can according to the reversing mode of display system, whether the polarity of the output voltage of judging-driving unit is changed, to adopt different determination methods, determine whether implementing operation such as gradeization, thus the power consumption of optimization drive unit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention one drive unit 10.
Fig. 2 A ~ Fig. 2 D is the schematic diagram of coherent signal when the drive unit shown in Fig. 1 operates.
Fig. 3 is the schematic diagram of drive unit 10 1 implementation shown in Fig. 1.
Fig. 4 is the schematic diagram of another implementation of drive unit 10 shown in Fig. 1.
Fig. 5 is the schematic diagram of embodiment of the present invention first method.
Wherein, description of reference numerals is as follows:
10 drive units
100 driver modules
102 modules such as grade
104 polarity judging units
106 judging units
108 unit such as grade
50 equalization methods
500 ~ 514 steps
C1 ~ C8 curve
CD [n:0], PD [n:0], CD [n], PD [n] signal
CLI current data line information
EQ etc. change control signal
GND ground terminal voltage
J0 ~ J2 working storage
LINE N, LINE N+1 data line
MUX selection unit
OUT output voltage
OUT_TP1, OUT_TP1_1 ~ OUT_TP1_8 previous object voltage
OUT_TP2, OUT_TP2_1 ~ OUT_TP2_8 current goal voltage
PLI past data line information
POL polarity inversion signal
SOG reset signal
SW1, SW2 switch
T_EQ impulsive
T1 ~ T3 time point
TH critical value
TH_P1 ~ TH_P4, TH_N1, TH_N2 charge threshold level
TP1, TP2 time interval
VPRE ,-VPRE pre-charge pressure
XOR mutual exclusion or lock
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram of the embodiment of the present invention one drive unit 10.Drive unit 10 is used for, according to an a current data line information CLI and past data line information PLI, producing output voltage OUT to display system (not being illustrated in Fig. 1).As shown in Figure 1, drive unit 10 comprises a driver module 100 and first module 102.Driver module 100 is used for according to current data line information CLI, produces output voltage OUT.Be coupled to driver module 100 Deng change module 102, comprise a polarity judging unit 104, judging unit 106 and first unit 108.Be used for according to the reversing mode of display system being coupled to output voltage OUT Deng changing module 102, judge whether the polarity of output voltage OUT is identical in continuous print time interval, thus according to current data line information CLI and past data line information PLI, judge the voltage differences of output voltage OUT in continuous print time interval, to determine whether perform first operation to output voltage OUT.Wherein, the operation such as gradeization that module such as grade 102 performs can be precharge (pre-charge) operation or charge share (charge sharing) operation, but is not limited thereto.Whether, by module such as gradeization 102, drive unit 10 can according to the reversing mode of display system and the output voltage OUT change in voltage in continuous time interval, determine adaptively to perform etc. to change operation, with the power consumption of optimization drive unit 10.
Specifically, past data line information PLI and current data line information CLI is used to refer to previous object voltage OUT_TP1 corresponding to continuous print time interval TP1, TP2 and current goal voltage OUT_TP2 respectively, and it corresponds respectively to data line (line) adjacent in display system.According to the reversing mode of display system, polarity judge module 104 can judge whether the polarity of output voltage OUT (i.e. previous object voltage OUT_TP1 and current goal voltage OUT_TP2) in time interval TP1, TP2 is identical, to export a polarity inversion signal POL.For example, when display system reversing mode for some reversion (dotinversion) time, corresponding to the previous object voltage OUT_TP1 of adjacent data line and the polarity of current goal voltage OUT_TP2 different.When the reversing mode of display system is for row reversion (column inversion), then the polarity corresponding to the previous object voltage OUT_TP1 of adjacent data line and current goal voltage OUT_TP2 is identical.
According to polarity inversion signal POL, judging unit 106 can adopt distinct methods, and judging whether needs to implement operation such as gradeization to output voltage OUT.When polarity inversion signal POL indicates the polarity of previous object voltage OUT_TP1 and current goal voltage OUT_TP2 different, first judging unit 106 in one impulsive T_EQ, resets output voltage OUT to ground terminal voltage GND by adjusting a reset signal SOG between time interval TP1 and time interval TP2.Next, judging unit 106, according to current data line information CLI, judges the difference of current goal voltage OUT_TP2 and ground terminal voltage GND, to determine whether perform operation such as gradeization in impulsive T_EQ.For example, when the absolute value of current goal voltage OUT_TP2 is greater than a charge threshold level TH_P1, represent current goal voltage OUT_TP2 large with the voltage differences of ground terminal voltage GND, and driver module 100 needs the electric current of at substantial to make output voltage OUT arrive current goal voltage OUT_TP2 by ground terminal voltage GND.Now, judging unit 106 by adjustment first control signal EQ, can control unit 108 such as gradeization and implements operation such as gradeization, to reduce the power consumption of drive unit 10.When the absolute value of current goal voltage OUT_TP2 is less than a charge threshold level TH_P2, the target voltage values representing output voltage OUT is little with the pressure reduction of ground terminal voltage GND.In this situation, the power consumption that operation can increase drive unit 10 is on the contrary changed in execution etc.Therefore, judging unit 106, by control signal EQ such as adjustment gradeizations, makes to wait the changes such as change unit 108 does not perform to operate, and maintains output voltage OUT.
On the other hand, when polarity inversion signal POL indicates the polarity of previous object voltage OUT_TP1 and the current goal voltage OUT_TP2 corresponding to adjacent data line identical, judging unit 106 is according to past data line information PLI and current data line information CLI, judge the voltage differences between previous object voltage OUT_TP1 and current goal voltage OUT_TP2, to determine whether perform operation such as gradeization in impulsive T_EQ.In this embodiment, when the absolute value of previous target voltage OUT_TP1 is greater than a charge threshold level TH_P3 and the absolute value of current goal voltage OUT_TP2 is less than a charge threshold level TH_P4, judging unit 106 judges that between previous object voltage OUT_TP1 and current goal voltage OUT_TP2, voltage differences is large, and driver module 100 needs the electric current of at substantial to make output voltage OUT arrive current goal voltage OUT_TP2 by previous object voltage OUT_TP1.Judging unit 106, by control signal EQ such as adjustment gradeization, controls unit 108 such as gradeization and implements operation such as gradeization, to reduce the power consumption of drive unit 10.Similarly, when the absolute value of previous target voltage OUT_TP1 is less than charge threshold level TH_P4 and the absolute value of current goal voltage OUT_TP2 is greater than a charge threshold level TH_P3, judging unit 106 judges that the voltage differences between previous object voltage OUT_TP1 and current goal voltage OUT_TP2 is large, and driver module 100 needs the electric current of at substantial to make output voltage OUT arrive current goal voltage OUT_TP2 by previous object voltage OUT_TP1.Judging unit 106, by control signal EQ such as adjustment gradeization, controls unit 108 such as gradeization and implements operation such as gradeization, to reduce the power consumption of drive unit 10.
Relatively, when the absolute value of absolute value and current goal voltage OUT_TP2 that the absolute value of previous target voltage OUT_TP1 and the absolute value of previous object voltage OUT_TP2 are all greater than charge threshold level TH_P3 or previous object voltage OUT_TP1 is all less than charge threshold level TH_P4, judging unit 106 judges that the voltage differences between previous object voltage OUT_TP1 and current goal voltage OUT_TP2 is little.In this situation, if the power consumption that operation increases drive unit 10 is on the contrary changed in execution etc.Therefore, judging unit 106 is by control signal EQ such as adjustment gradeization, and the change operations such as unit 108 does not perform are changed in control etc., and maintain output voltage OUT.Thus, by aforesaid operations flow process, drive unit 10 adaptability ground, according to the reversing mode of display system and output voltage OUT, determines whether implement operation such as gradeization, thus optimization power consumption.
Please refer to Fig. 2 A ~ 2D, Fig. 2 A ~ 2D is the schematic diagram of coherent signal when the drive unit 10 shown in Fig. 1 operates.Wherein, output voltage OUT corresponds to a data line LINE_N, output voltage OUT in display system in time interval TP2, then corresponds to the data line LINE_N+1 adjacent to data line LINE_N in display system in time interval TP1.As shown in the curve C 1 of Fig. 2 A, the reversing mode of display system is some reversion, polarity judging unit 104 exports the polarity inversion signal POL of low logic level, to indicate the polarity of output voltage OUT in time interval TP1 and time interval TP2 different (i.e. previous object voltage OUT_TP1_1 and current goal voltage OUT_TP2_1 polarity different).Judging unit 106 is when time point T1(and impulsive T_EQ starts), the paramount logic level of adjustment reset signal SOG, to reset output voltage OUT to ground terminal voltage GND, and terminates replacement operation at time point T2.Next, judging unit 106, according to current data line information CLI, judges that current goal voltage OUT_TP2_1 is less than a charge threshold level TH_N1(|TH_N1|=TH_P1), namely the absolute value of current goal voltage OUT_TP2_1 is greater than charge threshold level TH_P1.Judging unit 106 is by high logic level such as adjustment control signal EQ to such as gradeization, with before a time point T3 (impulsive T_EQ terminate before) output voltage OUT is charged to a pre-charge pressure (-VPRE) in advance, thus utilize precharge operation (namely etc. change operation) to reduce driver module 100 output voltage OUT to be discharged to power consumption needed for current goal voltage OUT_TP2_1.The mode being reduced power consumption by precharge operation should be well known to those skilled in the art, and for the sake of clarity, is not repeated herein.
Similarly, please refer to Fig. 2 A curve C 2, judging unit 106 is at time point T1, the paramount logic level of adjustment reset signal SOG, to reset output voltage OUT to ground terminal voltage GND, and at time point T2, reset signal SOG is adjusted to low logic level, to terminate replacement operation.With curve C 1 unlike, the current goal voltage OUT_TP2_2 of curve C 2 is greater than a charge threshold level TH_N2(|TH_N2|=TH_P2), namely the absolute value of current goal voltage OUT_TP2_2 is less than charge threshold level TH_P2, and judging unit 106 judges that current goal voltage OUT_TP2_2 is little with the pressure reduction of ground terminal voltage GND.If now etc. change unit 108 output voltage OUT to be charged in advance pre-charge pressure (-VPRE) in impulsive T_EQ, the power consumption of driver module 100 can be increased on the contrary.Therefore, judging unit 106 does not adjust etc. changes control signal EQ, to maintain output voltage OUT in impulsive T_EQ, thus the power consumption of optimization driver module 100.In addition, please refer to curve C 3 and the curve C 4 of Fig. 2 B.Curve C 3 and the operating process of the drive unit 10 of curve C 4 are similar to curve C 1 in Fig. 2 A and curve C 2 respectively, for the sake of clarity, are not repeated herein.
Please refer to Fig. 2 C, the reversing mode of display system is row reversion in this embodiment.Polarity judging unit 104 exports the polarity inversion signal POL of high logic level, with indicate output voltage OUT time interval TP1 and time interval TP2 Semi-polarity identical.Accordingly, it is low logic level that judging unit 106 adjusts reset signal SOG, changes unit 108 do not implement replacement operation to indicate etc.As shown in the curve C 5 of Fig. 2 C, according to past data line information PLI and current data line information CLI, judging unit 106 judge previous object voltage OUT_TP1_5 be greater than charge threshold level TH_P3 and the absolute value of current goal voltage OUT_TP2_5 is less than charge threshold level TH_P4.Therefore, judging unit 106 adjusts paramount logic level such as control signal EQ such as gradeization at time point T2, output voltage OUT is charged to a pre-charge pressure VPRE in advance before time point T3, thus output voltage OUT is discharged to the power consumption needed for current goal voltage OUT_TP2_5 by reduction driver module 100.
On the other hand, please refer to the curve C 6 of Fig. 2 C, polarity judging unit 104 exports the polarity inversion signal POL of high logic level, with indicate output voltage OUT time interval TP1 and time interval TP2 Semi-polarity identical.Accordingly, it is low logic level that judging unit 106 adjusts reset signal SOG, changes unit 108 do not implement replacement operation to indicate etc.With curve C 5 unlike, according to past data line information PLI and current data line information CLI, judging unit 106 judges that the absolute value of previous object voltage OUT_TP1_6 and the absolute value of current goal voltage OUT_TP2_6 are all greater than charge threshold level TH_P3.If now unit such as gradeization 108 performs operation such as gradeization, the power consumption of driver module 100 can be increased on the contrary.Therefore, judging unit 106 is low logic level at change control signal EQ such as time point T2 to time point T3 maintain, to maintain output voltage OUT.Accordingly, the power consumption of driver module 100 can be optimized.In addition, please refer to curve C 7 and the curve C 8 of Fig. 2 D.The operating process of the drive unit 10 that curve C 7 is corresponding with curve C 8 is similar to curve C 5 in Fig. 2 C and curve C 6 respectively, for the sake of clarity, is not repeated herein.
It should be noted that the reversing mode of above-described embodiment according to display system, judge that whether the polarity of the output voltage corresponding to adjacent data line is identical.If the polarity corresponding to the output voltage of adjacent data line is different, then according to the current goal magnitude of voltage of output voltage, determine whether implement operation such as gradeization.If the polarity of output voltage corresponding to adjacent data line is identical, then according to the difference between the previous object magnitude of voltage of output voltage and current goal magnitude of voltage, determine that whether implementing gradeizations operates.Accordingly, the power consumption of drive unit can be optimized.According to different application, those skilled in the art should implement suitable change and amendment according to this.For example, charge threshold level TH_P1 and charge threshold level TH_P2 can be identical numerical value.What is more, charge threshold level TH_P3 also can be equal to charge threshold level TH_P4.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of drive unit 10 1 embodiment shown in Fig. 1.As shown in Figure 3, judging unit 106 realized by working storage J0 ~ J2, mutual exclusion or lock XOR and selection unit MUX, and unit such as grade 108 is made up of interrupteur SW 1, SW2.About the detailed operation process of the drive unit 10 shown in Fig. 3, illustrate as follows.In this embodiment, charge threshold level TH_P1 ~ TH_P4 equals a critical value TH.According to current data line information CLI, judging unit 106 judges whether the absolute value of current goal voltage is greater than critical value TH, and judged result is stored in working storage J0.For example, when the absolute value of current goal voltage is greater than critical value TH, a high logical signal is stored in working storage J0 by judging unit 106; Otherwise when the absolute value of current goal voltage is less than critical value TH, a low logical signal is stored in working storage J0 by judging unit 106.Similarly, according to past data line information PLI, judging unit 106 judges whether the absolute value of previous object voltage is greater than critical value TH, and judged result is stored in working storage J1.Two input ends of mutual exclusion or lock XOR are coupled to working storage J0, J1.According to the characteristic of mutual exclusion or lock XOR, when the output of mutual exclusion or lock XOR is high logical signal, represent the absolute value of current goal voltage and previous object voltage absolute value one of them be greater than critical value TH; Otherwise when the output of mutual exclusion or lock XOR is low logical signal, the absolute value of the absolute value and previous object voltage that represent current goal voltage is all greater than or is all less than critical value TH.Accordingly, selection unit MUX can according to polarity inversion signal POL, selects working storage J0 or the output of mutual exclusion or lock XOR as waiting change control signal EQ, and is stored in working storage J2.Working storage J2 is used for coordinating the clock signal (not being illustrated in Fig. 3) of driver module 100, exports control signal EQ such as gradeizations, operates the change such as to complete.
For example, when polarity switch signal POL indicates output voltage OUT when the polarity of continuous print time interval TP1, TP2 is different, judging unit 106 is first according to the clock signal of driver module 100, by adjustment reset signal SOG, actuating switch SW2 in impulsive T_EQ, to reset to ground terminal voltage GND by output voltage OUT.Selection unit MUX selects working storage J0 as control signal EQ such as gradeization, whether to be greater than critical value TH according to the current goal voltage OUT_TP2 corresponding to time interval TP2, implements operation such as gradeization.If the absolute value of current goal voltage OUT_TP2 is greater than critical value TH, working storage J0 exports high logical signal, and is stored in working storage J2.Working storage J2 coordinates driver module 100 clock signal, exports control signal EQ such as gradeization, with actuating switch SW1, thus output voltage OUT is charged to pre-charge pressure VPRE in advance.It is noted that in this embodiment, the polarity of pre-charge pressure VPRE can convert along with current goal voltage OUT_TP2.Otherwise if current goal voltage is less than critical value TH, working storage J0 exports low logical signal, and is stored in working storage J2.Working storage J2 coordinates driver module 100 clock signal, exports control signal EQ such as gradeization, and with cut-off switch SW1, output voltage OUT maintains ground terminal voltage GND.Accordingly, the power consumption of driver module 100 can be optimized.
On the other hand, when polarity switch signal POL indicates output voltage OUT when the polarity of continuous print time interval TP1, TP2 is identical, selection unit MUX selects the output of mutual exclusion or lock XOR as waiting change control signal EQ, whether be greater than critical value TH with the absolute value of the absolute value according to the current goal voltage OUT_TP2 corresponding to time interval TP2 and the previous object voltage OUT_TP1 corresponding to time interval TP1, implement operation such as gradeization.Current goal voltage OUT_TP2 and previous object voltage OUT_TP1 one of them when being greater than critical value TH, mutual exclusion or lock XOR export high logical signal and are stored in working storage J2.Working storage J2 coordinates driver module 100 clock signal, exports control signal EQ such as gradeization, with actuating switch SW1, thus output voltage OUT is charged to pre-charge pressure VPRE in advance.Otherwise, if when the absolute value of the absolute value of current goal voltage OUT_TP2 and previous object voltage OUT_TP1 is all greater than or is all less than critical value TH, working storage J0 exports low logical signal, and be stored in working storage J2.Working storage J2, according to driver module 100 clock signal, exports control signal EQ such as gradeization, with cut-off switch SW1.Output voltage OUT will be maintained previous object voltage OUT_TP1.Accordingly, the power consumption of driver module 100 can effectively be reduced.
In addition, if critical value TH be the half of driver module 100 supply voltage and current data line information CLI and past data line information PLI respectively with n bit signal CD [n:0], PD [n:0] time, judging unit 106 directly can use the highest significant position unit (MSB) of current data line information CLI and past data line information PLI, i.e. bit CD [n] and PD [n], as the output of working storage J0 and working storage J1.Please refer to Fig. 4, Fig. 4 is the schematic diagram for another embodiment of drive unit 10 shown in Fig. 1.Drive unit 10 shown in Fig. 4 is similar to the drive unit 10 shown in Fig. 3, and signal and the element therefore with identical function use identical symbol.In this embodiment, because charge threshold level TH_P1 ~ TH_P4 equals the half of driver module 100 supply voltage, therefore the highest significant position unit of current data line information CLI and past data line information PLI can directly as the output of working storage J0 and working storage J1.Thus, the drive unit 10 shown in Fig. 4 can be more succinct circuit realiration judging unit 106.DOP detailed operating procedure about the drive unit 10 shown in Fig. 4 with reference to above-mentioned, for the sake of clarity, can be not repeated herein.It should be noted that, in this embodiment, according to different charge threshold level TH_P1 ~ TH_P4, judging unit 106 can use except all the other bits of highest significant position unit are as the foundation judging current goal voltage OUT_TP2, previous object voltage OUT_TP1 in current data line information CLI and past data line information PLI, and is not limited to the implementation of Fig. 4.
Above-mentioned module such as gradeization 100, according to the reversing mode of display system, adopts different determination methods to determine whether implementing the operating process of operation such as gradeization, can be summarized in first method 50, please refer to Fig. 5.If it is noted that can obtain identical result in fact, the sequence of steps of equalization method 50 is not limited to the sequence of steps shown in Fig. 5.As shown in Figure 5, equalization method 50 can be used for a drive unit, and comprises following steps:
Step 500: start.
Step 502: according to the reversing mode of display system being coupled to drive unit, the polarity of the output voltage of judging-driving unit in a very first time interval with one second time interval in whether different, to produce a polarity inversion signal.When polarity inversion signal instruction output voltage polarity in very first time interval with the second time interval in different time, perform step 504; Otherwise, perform step 512.
Step 504: between very first time interval and the second time interval in an impulsive, resets to ground terminal voltage by output voltage.
Step 506: according to a current data line information, judges the magnitude relationship between current goal voltage and one first critical voltage and one second critical voltage.If the absolute value of current goal voltage is greater than the first critical voltage, perform step 508; If the absolute value of current goal voltage is less than the second critical voltage, perform step 510.
Step 508: perform operation such as gradeization.
Step 510: not perform etc. and change operation.
Step 512: according to current data line information and a past data line information, judges the magnitude relationship between current goal voltage, previous object voltage and one the 3rd critical voltage and one the 4th critical voltage.When previous target voltage is greater than the 3rd critical voltage and current goal voltage is less than the 4th critical voltage, or when previous target voltage is less than the 4th critical voltage and current goal voltage is greater than the 3rd critical voltage, perform step 508; When previous target voltage and current goal voltage are all less than the 4th critical voltage, or when previous object voltage and current goal voltage are all greater than the 3rd critical voltage, perform step 510.
Step 514: terminate.
According to equalization method 50, drive unit can, according to the reversing mode of display system, adopt diverse ways to determine whether implementing operation such as gradeization, thus the power consumption of optimization drive unit.Wherein, operation such as grade can be precharge operation and charge share operation, and is not limited thereto.Detailed operation process about equalization method 50 with reference to above-mentioned, for the sake of clarity, can be not repeated herein.
In sum, the equalization method that above embodiment proposes and relevant drive unit can according to the reversing mode of display system, and whether the polarity of the output voltage of judging-driving unit is changed, and to adopt different determination methods, determine whether implementing operation such as gradeization.In other words, change operation according to the variation characteristic control etc. of drive unit output voltage the equalization method that above embodiment proposes and relevant drive unit adaptability, thus the power consumption of optimization drive unit.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (22)
1. an equalization method, for a drive unit, is characterized in that this equalization method comprises:
According to the reversing mode of a display system being coupled to this drive unit, judge whether the polarity of an output voltage of this drive unit is identical with in one second time interval in a very first time interval, to produce a polarity inversion signal; And
According to this polarity inversion signal, a current data line information and a past data line information, determine that whether between this very first time interval and this second time interval, performing first in an impulsive to this output voltage operates.
2. equalization method as claimed in claim 1, is characterized in that these changes are operating as a precharge operation.
3. equalization method as claimed in claim 1, is characterized in that these changes are operating as a charge sharing operation.
4. equalization method as claimed in claim 1, it is characterized in that according to this polarity inversion signal, this current data line information and this past data line information, determine that whether performing these to this output voltage in this impulsive between and this second time interval interval in this very first time changes the step operated and comprise:
When this polarity inversion signal indicate the polarity of this output voltage in this very first time interval with this second time interval in different time, in this impulsive, this output voltage is reset to a ground terminal voltage; And
The current goal voltage indicated at this second time interval according to this current data line information and at least one charge threshold level, determine that whether in this impulsive, performing these to this output voltage changes operation.
5. equalization method as claimed in claim 4, it is characterized in that this current target voltage of indicating at this second time interval according to this current data line information and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this current target voltage is greater than first charge threshold level in this at least one charge threshold level, in this impulsive, this output voltage is performed these and change operation.
6. equalization method as claimed in claim 4, it is characterized in that this current target voltage of indicating at this second time interval according to this current data line information and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this current target voltage is less than first charge threshold level in this at least one charge threshold level, in this impulsive, maintain this output voltage.
7. equalization method as claimed in claim 1, it is characterized in that according to this polarity inversion signal, this current data line information and this past data line information, determine that whether performing these to this output voltage in this impulsive between and this second time interval interval in this very first time changes the step operated and comprise:
When this polarity inversion signal indicates the polarity of this output voltage identical with in this second time interval in this very first time interval, the current goal voltage indicated at this second time interval according to this current data line information, this past data line information, in a previous object voltage of this very first time interval instruction and at least one charge threshold level, determine that whether in this impulsive, performing these to this output voltage changes operation.
8. equalization method as claimed in claim 7, the current goal voltage that it is characterized in that indicating at this second time interval according to this current data line information, this past data line information, in a previous object voltage of this very first time interval instruction and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this previous object voltage is greater than one first charge threshold level in this at least one charge threshold level and the absolute value of this current target voltage is less than second charge threshold level in this at least one charge threshold level, in this impulsive, this output voltage is performed these and change operation.
9. equalization method as claimed in claim 7, the current goal voltage that it is characterized in that indicating at this second time interval according to this current data line information, this past data line information, in a previous object voltage of this very first time interval instruction and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this current target voltage is greater than one first charge threshold level in this at least one charge threshold level and the absolute value of this previous object voltage is less than second charge threshold level in this at least one charge threshold level, in this impulsive, this output voltage is performed these and change operation.
10. equalization method as claimed in claim 7, the current goal voltage that it is characterized in that indicating at this second time interval according to this current data line information, this past data line information, in a previous object voltage of this very first time interval instruction and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this previous object voltage is greater than one first charge threshold level in this at least one charge threshold level and the absolute value of this current target voltage is greater than this first charge threshold level, in this impulsive, maintain this output voltage.
11. equalization methods as claimed in claim 7, the current goal voltage that it is characterized in that indicating at this second time interval according to this current data line information, this past data line information, in a previous object voltage of this very first time interval instruction and this at least one charge threshold level, determine that whether in this impulsive, performing these steps changing operation to this output voltage comprises:
When the absolute value of this previous object voltage is less than one first charge threshold level in this at least one charge threshold level and the absolute value of this current target voltage is less than this first charge threshold level, in this impulsive, maintain this output voltage.
12. 1 kinds of drive units, for a display system, this drive unit comprises:
One driver module, is used for, according to a current data line information, producing an output voltage; And
First module, comprising:
One polarity judging unit, is used for, according to a reversing mode of this display system, judging the polarity of this output voltage with whether different during second time interval in a very first time interval, to produce a polarity inversion signal;
One judging unit, is coupled to this polarity judging unit, is used for according to this polarity inversion signal, this current data line information and a past data line information, produces first control signal and a reset signal; And
First unit, be coupled to this driver module and this judging unit, be used for changing control signal and this reset signal according to these, determine whether in this very first time interval and in an impulsive, first is performed to this output voltage between this second time interval and operate.
13. drive units as claimed in claim 12, is characterized in that these changes are operating as a precharge operation.
14. drive units as claimed in claim 12, is characterized in that these changes are operating as a charge sharing operation.
15. drive units as claimed in claim 12, it is characterized in that when this polarity inversion signal indicate the polarity of this output voltage in this very first time interval with this second time interval in for different time, this judging unit is by this reset signal of adjustment, make this output voltage in this impulsive, reset to a ground terminal voltage, and the current goal voltage that separately indicates at this second time interval according to this current data line information of this judging unit and at least one charge threshold level, determine that whether in this impulsive, performing these to this output voltage changes operation.
16. drive units as claimed in claim 15, it is characterized in that when the absolute value of this current target voltage is greater than first charge threshold level in this at least one charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and perform these change operations to this output voltage in this impulsive.
17. drive units as claimed in claim 15, it is characterized in that when the absolute value of this current target voltage is less than first charge threshold level in this at least one charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and maintain this output voltage in this impulsive.
18. drive units as claimed in claim 12, it is characterized in that when this polarity inversion signal indicates the polarity of this output voltage in this very first time interval with when being identical in this second time interval, the previous object voltage that the current goal output voltage that this judging unit indicates at this second time interval according to this current data line information, this past data line information indicate in this very first time interval and at least one charge threshold level, determine that whether in this impulsive, performing these to this output voltage changes operation.
19. drive units as claimed in claim 18, it is characterized in that when the absolute value of this current target voltage is greater than one first charge threshold level in this at least one charge threshold level and the absolute value of this previous object voltage is less than second charge threshold level in this at least one charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and perform these change operations to this output voltage in this impulsive.
20. drive units as claimed in claim 18, it is characterized in that when the absolute value of this previous object voltage is greater than one first charge threshold level in this at least one charge threshold level and the absolute value of this current target voltage is less than second charge threshold level in this at least one charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and perform these change operations to this output voltage in this impulsive.
21. drive units as claimed in claim 18, it is characterized in that the absolute value when this current target voltage is greater than one first charge threshold level in this at least one charge threshold level, and the absolute value of this previous object voltage is when being greater than this first charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and maintain this output voltage in this impulsive.
22. drive units as claimed in claim 18, it is characterized in that the absolute value when this current target voltage is less than one first charge threshold level in this at least one charge threshold level, and the absolute value of this previous object voltage is when being less than this first charge threshold level, by adjustment, these change control signal to this judging unit, make these change unit and maintain this output voltage in this impulsive.
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| CN201310528636.9A CN104599644A (en) | 2013-10-30 | 2013-10-30 | Equalization method and driving device thereof |
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| CN201310528636.9A CN104599644A (en) | 2013-10-30 | 2013-10-30 | Equalization method and driving device thereof |
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