CN101419782A - Low power source driving device - Google Patents
Low power source driving device Download PDFInfo
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- CN101419782A CN101419782A CNA200710165421XA CN200710165421A CN101419782A CN 101419782 A CN101419782 A CN 101419782A CN A200710165421X A CNA200710165421X A CN A200710165421XA CN 200710165421 A CN200710165421 A CN 200710165421A CN 101419782 A CN101419782 A CN 101419782A
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Abstract
A low power source electrode driving device relates to a low power source electrode driving technology applied to an LCD driver; different digital signal combinations are generated by a sequential control digit circuit, while a dynamic regulation bias circuit of a source electrode driver regulates the bias current of the source electrode driver in a sectional type according to the digital signal combinations, thus simultaneously realizing the output of gamma voltage electric potential and the reduction of power consumption; furthermore, the power consumption can be further lowered along with the increment of sectional number of the bias current.
Description
Technical field
The invention relates to a kind of source electrode driving device, refer to a kind of bias current that utilizes sectional type ground to adjust source electrode driver especially, realize the output of gamma voltage current potential and the source electrode driving device that power consumption reduces simultaneously.
Background technology
The LCD of small-medium size is widely used in various hand-held electronic products, for example personal digital assistant and mobile phone, yet along with the development of hand-held electronic product, high more to the requirement of LCD size, the length service time additional important especially of battery.Power consumption is the important pointer of hand-held electronic product, and low power consumption means long battery service time, as long as reduce the power consumption of hand-held electronic product inner body, and just can be directly and prolong battery service time effectively.
On the drive unit of LCD, mainly contain two kinds of driven units, be respectively in order to the source electrode driver (Source Driver) of driving transverse axis and the gate drivers (Gate Driver) of Z-axis.And under the development trend that Thin Film Transistor-LCD (TFT-LCD) manufacturing technology is high more towards resolution now, size is big, also more meticulous and complicated on assembly structure, display panel has also comprised baroque thin film transistor (TFT) (TFT) and bridging line assemblies such as (Common Line) except the signal wire (DataLine) that presents level and homeotropic alignment, gate line (Gate Line)
The single-chip liquid crystal driver is an inner common electronic package of hand-held electronic product, and its power consumption is occupied an important ratio in hand-held electronic product.The manufacturer of hand-held electronic product is devoted to reduce the power consumption of this single-chip liquid crystal driver invariably, and the power consumption of analysis conventional liquid crystal driver, the power consumption of source electrode driver account for whole more than 50%.
See also Fig. 1 and Fig. 2, in existing liquid crystal driver and driving method thereof, liquid crystal driver 10 is in a gate line time T
Grid(time of gate line), gamma (gamma) voltage potential was simulated in interior output accurately, can provide source electrode driver 11 1 enough and fixing bias current I
The source electrode bias voltage, make the voltage V of the source electrode channel loading (source channel loading) 22 on the signal wire 21 of display panels 20
Source channelCan climb or drop to the gamma voltage current potential of appointment soon, suppose that this climbs or the required time that descends is T
Reference sourceAnd, in this gate line time T
GridThe reaction time that interior reservation is enough is given thin film transistor (TFT) monomer load (TFT cell loading) 23, makes storage capacitors C in this thin film transistor (TFT) monomer load 23
TFTVoltage potential V
TFTClimb or drop to the gamma voltage current potential of appointment, suppose that this climbs or the required time that descends is T
Rf_TFTSo we can list its equation: T
Grid=T
Reference source+ T
Rf_TFT
In the prior art, in a gate line time T
GridThe function of gamma voltage current potential for this source electrode driver 11 simulated in interior output accurately, still along with the increase of display panels 20 sizes, will make each gate line time T
GridShorten.Therefore, source electrode driver 11 current driving ability that needs to increase its outputs is to meet the gate line time T after the shortening
GridTraditionally, increase the bias current I of source electrode driver 11
The source electrode bias voltageCan be effectively and directly increase the current driving ability of its output, but the bias current I of source electrode driver 11 increased
The source electrode bias voltageTo the power consumption of liquid crystal driver 10 sharply be increased.
In sum, the drive unit of prior art and method have following shortcoming:
1. keeping the storage capacitors C that gives in this thin film transistor (TFT) monomer load 23
TFTVoltage potential V
TFTClimb or drop to the time T of the gamma voltage current potential of appointment
Rf_TFTIn, still give source electrode driver 11 and be same as T
Reference sourceBias current I in time
The source electrode bias voltageBut this moment is because the voltage V of the source electrode channel loading 22 of display panels 20
Source channelReached the gamma voltage current potential of appointment, for example: 99% V
GammaSo, the bias current I that this moment, source electrode driver 11 or input were fixed
The source electrode bias voltage, will only can cause power consumption.
2. climb or drop to the time T of the gamma voltage current potential of appointment at the voltage of source electrode channel
Reference sourceIn, give this bias current I that source electrode driver 11 is fixed
The source electrode bias voltage, consult Fig. 2, but only at preceding 1/4 T
The rf_ source electrodeIn time, the voltage V of source electrode channel loading 22
Source channelViolent transient change is just arranged, remaining T
Rf_sourcWith T
Rf_TFTTime, the bias current I that input is fixing
The source electrode bias voltage, will only can cause power consumption.
Summary of the invention
So, for solving above-mentioned disappearance, avoid the existence that lacks, when fundamental purpose of the present invention is to realize the output of gamma voltage current potential, also reduce the power consumption of liquid crystal driver.
For the foregoing reasons, the present invention proposes a low power source Drive technology that is applied to liquid crystal driver, by the bias current of sectional type ground adjustment source electrode driver, realizes the output of gamma voltage current potential and the reduction of power consumption simultaneously.And along with the bias current segments purpose of source electrode driver increases, power consumption can further reduce.
The present invention is a kind of low power source driving device, be to be applied to liquid crystal driver in order to the signal that drives a display panels online source electrode channel loading and the load of thin film transistor (TFT) monomer, this source electrode driving device comprises: a sequential control figure circuit is in order at a gate line in the time, comply with the requirement of the load of this display panels, produce the combination of different digital signal, and these digital signals are combined in, and the logic of digital signal current potential was only arranged in the same time is 1; And a source electrode driver bias circuit of dynamically adjusting produces the bias current of different simulation current potentials according to aforesaid these digital signal combinations; And the multiple source driver, it utilizes aforesaid bias current, produces corresponding output driving force, makes the load of display panels climb in the time or drop to the gamma voltage current potential of appointment at a gate line.
Wherein to be incorporated into be the combination of two digital signals to this digital signal less; And the source electrode driver bias circuit that should dynamically adjust, it produces the bias current of at least two simulation current potentials according to aforesaid these digital signal combinations, produce normal bias current at the beginning of each gate line time, make these source electrode drivers produce enough driving forces, the load voltage of display panels is climbed or drop to the gamma voltage current potential of appointment, and at remaining gate line in the time, produce at least one lower bias current, make these source electrode drivers produce stable driving force.Near the end of each gate line time, the bias current that this source electrode driver bias circuit of dynamically adjusting produces is more little more.
Another embodiment of the invention is to replace these source electrode drivers by a plurality of gamma drivers and the combination of a plurality of digital analog converter, the number of these gamma drivers is identical with the grey exponent number that this display panels is desired to present, utilize aforesaid bias current, produce the gray scale voltage of desiring to present respectively, again by the required gray scale voltage of these digital analog converters output to these source electrode channel loadings, make the load of display panels climb in the time or drop to the gamma voltage current potential of appointment at a gate line.
Wherein these gamma drivers further are made up of a plurality of gamma pre-drivers and the resistance between each gamma pre-driver, utilize aforesaid bias current, and dividing potential drop produces the gray scale voltage of desiring to present respectively.
The invention has the advantages that a gate line in the time,, realize the output of gamma voltage current potential and the reduction of power consumption simultaneously, use the present invention can reduce the power consumption of source electrode driver about 20% by the bias current of sectional type ground adjustment source electrode driver.And along with bias current segments purpose increases, its power consumption can further reduce.
Description of drawings
Fig. 1 is that the source electrode driver of prior art drives LCD load synoptic diagram.
Fig. 2 is the source electrode channel loading of Fig. 1 and the voltage of thin film transistor (TFT) monomer load, and the oscillogram of the bias current of source electrode driver.
Fig. 3 is that source electrode driver of the present invention drives LCD load synoptic diagram.
Fig. 4 is the synoptic diagram of the first embodiment of the present invention.
Fig. 5 is the source electrode channel loading of Fig. 4 and the voltage of thin film transistor (TFT) monomer load, and the oscillogram of the bias current of source electrode driver.
Fig. 6 is the synoptic diagram of the second embodiment of the present invention.
Fig. 7 is the source electrode channel loading of Fig. 6 and the voltage of thin film transistor (TFT) monomer load, and the oscillogram of the bias current of source electrode driver.
Fig. 8 is the synoptic diagram of the third embodiment of the present invention.
Fig. 9 is the synoptic diagram of the fourth embodiment of the present invention.
Embodiment
For detailed content of the present invention and technical descriptioon, now be described further, but will be appreciated that these embodiment are the usefulness for illustrating only, and should not be interpreted as restriction of the invention process with embodiment.
As shown in Figure 3, the present invention is a kind of low power source driving device, it is the drive unit that is applied to liquid crystal driver 100 in order to source electrode channel loading on the signal wire 210 that drives a display panels 200 220 and thin film transistor (TFT) monomer load 230, it comprises a sequential control figure circuit 120, in order in a gate line time T
GridIn produce different digital signal combination AP0～APX according to the requirement of the load of this display panels 200, and these digital signals combinations AP0～APX the logic current potential of a digital signal only to be arranged at one time be 1.And a source electrode driver bias circuit 130 of dynamically adjusting produces the bias current I of different simulation current potentials according to aforesaid these digital signal combinations AP0～APX
Source electrode is inclined to one side PressWhen the logic current potential 1 of digital signal AP0, the highest bias current I of the source electrode driver bias circuit 130 of dynamically adjustment has been selected in expression for use
The source electrode bias voltageWhen the logic current potential 1 of digital signal APX, the minimum bias current of the source electrode driver bias circuit 130 of dynamic adjustment has been selected in expression for use.Also have multiple source driver 110, it utilizes aforesaid bias current I
The source electrode bias voltageControl the source voltage current potential V of these source electrode driver 110 inputs
Source_level_1Produce corresponding output driving force, make the source electrode channel loading 220 of display panels 200 and the thin film transistor (TFT) monomer load 230 can be in a gate line time T
GridIn climb or drop to the gamma voltage current potential of appointment.
In addition, in order to cooperate explanation the present invention, connect the equivalent source aisle resistance R of the source electrode channel loading 220 of this display panels 200 at the output terminal of these source electrode drivers 110
Source channel _ 1～R
Source channel _ NWith equivalent source passage capacitor C
Source channel _ 1～C
Source channel _ N, and the equivalent monomer resistance R of thin film transistor (TFT) monomer load 230
TFT_1～R
TFT_NWith equivalent storage capacitors C
TFT_1～C
TFT_N
Digital signal combination AP0～APX of the present invention is at least the combination of two digital signals; And the source electrode driver bias circuit 130 that should dynamically adjust, it produces the bias current I of at least two simulation current potentials according to these digital signal combinations AP0～APX
The source electrode bias voltage, in each gate line time T
GridBeginning produce normal bias current I
The source electrode bias voltage, make these source electrode drivers 110 produce enough driving forces, make the voltage V of the source electrode channel loading 220 of display panels 200
Source channelClimb or drop to the gamma voltage current potential of appointment, and in remaining gate line time T
Grid, produce at least one lower bias current I
The source electrode bias voltage, make these source electrode drivers 110 produce stable driving force.And more near each gate line time T
GridEnd, the bias current I that this source electrode driver bias circuit of dynamically adjusting 130 produces
The source electrode bias voltageMore little.
Seeing also Fig. 4, is first embodiment according to the invention, and this sequential control digital circuit 120 is in order in a gate line time T
GridThe interior combination that produces two digital signals of AP0～AP1.In the present embodiment, a gate line time T
GridIn, with the bias current I of these source electrode drivers 110
The source electrode bias voltageBeing divided into two sections, is respectively the voltage V that makes the source electrode channel loading 220 on the signal wire 210 of this display panels 200
Source channelCan climb or drop to the time T of the gamma voltage current potential of appointment soon
Reference source, and make storage capacitors C in this thin film transistor (TFT) monomer load 230
TFTVoltage potential V
TFTClimb or drop to the required time T of gamma voltage current potential of appointment
Rf_TFTAt T
Reference sourceIn time, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP0, with producing higher bias current I so that be somebody's turn to do the source electrode driver bias circuit of dynamically adjusting 130
The source electrode bias voltage(I
AP0), thereby make source electrode driver 110 produce enough driving forces, make the voltage V of the source electrode channel loading 220 of display panels 200
Source channelClimb or drop to the gamma voltage current potential of appointment, gamma voltage current potential such as 99%.
At remaining T
Rf_TFTIn time, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP1, makes this source electrode driver bias circuit of dynamically adjusting 130 produce lower bias current I
The source electrode bias voltage(I
AP1), thereby make source electrode driver 110 produce stable driving force, make the voltage potential V of this thin film transistor (TFT) monomer load 230
TFTClimb or drop to the gamma voltage current potential of appointment, gamma voltage current potential such as 99%.
The voltage V of this source electrode channel loading 220 and thin film transistor (TFT) monomer load 230
The source electrode ditch The roadWith V
TFTAnd the bias current I of source electrode driver 110
The source electrode bias voltageOscillogram as shown in Figure 5, power consumption (or average current) P1 of the source electrode driver 110 of present embodiment compares with power consumption (or average current) P0 of traditional source electrode driver 11 and is about: P1/P0=(I
AP0* T
Reference source+ I
AP1* T
Rf_TFT)/(I
AP0* T
Grid).
Illustrate, if R
Source channelBe 8KOhm, C
Source channelBe 12pF, R
TFTBe 15MOhm, C
TFTBe 0.5pF, a gate line time T
GridBe 50uS, and make source voltage rise to 4.5V, can get I by 0.5V
AP0Be 77.1nA, T
Reference sourceBe 27.2uS, I
AP1Be 48.7nA, T
Rf_TFTBe 22.8uS, can get P1/P0=83.2% by aforementioned calculating formula.
Seeing also Fig. 6, is according to second embodiment of the present invention, and this sequential control digital circuit 120 is in order in a gate line time T
GridThe interior combination that produces three digital signals of AP0～AP2.In the present embodiment, a gate line time T
GridIn, with the bias current I of these source electrode drivers 110
The source electrode bias voltageBeing divided into three sections, is the voltage V with this source electrode channel loading 220
Source channelClimb or drop to the time T of the gamma voltage current potential of appointment
Reference sourceBe divided into (3/5) * T
Reference sourceWith (2/5) * T
Reference source, and make storage capacitors C in this thin film transistor (TFT) monomer load 230
TFTVoltage potential V
TFTClimb or drop to the required time T of gamma voltage current potential of appointment
Rf_TFTAt (3/5) * T
Reference sourceIn time, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP0, with producing higher bias current I so that be somebody's turn to do the source electrode driver bias circuit of dynamically adjusting 130
The source electrode bias voltage(I
AP0), thereby make source electrode driver 110 produce enough driving forces, make the voltage V of the source electrode channel loading 220 of display panels 200
Source channelClimb or drop to the gamma voltage current potential of appointment, gamma voltage current potential such as 81.2%.At (2/5) * T
Reference sourceIn time, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP1, makes this source electrode driver bias circuit of dynamically adjusting 130 produce time high bias current I
The source electrode bias voltage(I
AP1), make the voltage V of the source electrode channel loading 220 of display panels 200
Source channelClimb or drop to the gamma voltage current potential of appointment, gamma voltage current potential such as 99%.
At remaining T
Rf_TFTIn time, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP2, makes this source electrode driver bias circuit of dynamically adjusting 130 produce lower bias current I
The source electrode bias voltage(I
AP2), thereby make source electrode driver 110 produce stable driving force, make the voltage potential V of thin film transistor (TFT) monomer load 230
TFTClimb or drop to the gamma voltage current potential of appointment, gamma voltage current potential such as 99%.
The voltage V of this source electrode channel loading 220 and thin film transistor (TFT) monomer load 230
The source electrode ditch The roadWith V
TFTAnd the bias current I of source electrode driver 110
The source electrode bias voltageOscillogram as shown in Figure 7, power consumption (or average current) P2 of the source electrode driver 110 of present embodiment compares with power consumption (or average current) P0 of traditional source electrode driver 11 and is about: P2/P0=(I
AP0* (3/5) * T
Reference source+ I
AP1* (2/5) * T
Reference source+ I
AP2* T
Rf_TFT)/(I
AP0* T
Grid).
Illustrate, if R
Source channelBe 8KOhm, C
Source channelBe 12pF, R
TFTBe 15MOhm, C
TFTBe 0.5pF, a gate line time T
GridBe 50uS, and make source voltage rise to 4.5V, can get I by 0.5V
AP0Be 77.1nA, T
Reference sourceBe 27.2uS, I
AP1Be 57.3nA, I
AP2Be 48.8nA, T
Rf_TFTBe 22.8uS, can get P2/P0=77.9% by aforementioned calculating formula.
The rest may be inferred, in a gate line time T
GridIn, the present invention can be with the bias current I of this source electrode driver 110
The source electrode bias voltageBe divided into multistage (as shown in Figure 3).In a gate line time T
GridInitial, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal AP0, makes this source electrode driver bias circuit of dynamically adjusting 130 produce higher bias current I
The source electrode bias voltage, make source electrode driver 110 produce enough driving forces, make the voltage V of the source electrode channel loading 220 of display panels 200
Source channelClimb or drop to the gamma voltage current potential of appointment.In a gate line time T
GridThe most last, it is 1 that this sequential control digital circuit 120 makes the logic current potential of digital signal APX, makes this source electrode driver bias circuit of dynamically adjusting 130 produce minimum bias current I
The source electrode bias voltage, thereby make source electrode driver 110 produce stable driving force, make the voltage potential V of thin film transistor (TFT) monomer load 230
TFTClimb or drop to the gamma voltage current potential of appointment.
The structure of the foregoing description is that each source electrode channel has source electrode driver 110 separately, and do not departing under spirit of the present invention and the category situation, another embodiment of the invention is to replace these source electrode drivers 110 by a plurality of gamma drivers and the combination of a plurality of digital analog converter.In third embodiment of the invention, not like previous embodiment, each source electrode channel there is no source electrode driver 110 separately, and its mode that adopts is: the source electrode channel of each same gray level is driven by same source electrode driver, and such source electrode driver is called the gamma driver.
See also shown in Figure 8, present embodiment is the drive unit that is used to drive source electrode channel loading 420 and thin film transistor (TFT) monomer load 430 on the signal wire 410 of this display panels 400 in this liquid crystal driver 300, it comprises: this sequential control digital circuit 320 and the source electrode driver bias circuit of dynamically adjusting 330, and a plurality of gamma drivers 310, the number of these gamma drivers 310 is identical with the grey exponent number of desiring to present, for example M GTG just has M gamma driver 310, and these gamma drivers 310 are subjected to aforesaid bias current I
The source electrode bias voltageControl, make the gamma voltage current potential V of corresponding input
Gamma _ level_1～V
Gamma _ level_MG1～GM is corresponding with the output gray scale voltage.
For these gray scale voltages G1～GM, select data (GS by a plurality of digital analog converters 340 according to numeral again as source electrode driver
00～GS
0Y..., GS
N0～GS
NY) suitable gray scale voltage G1～GM is transmitted out, make the voltage of the load (source electrode channel loading 420 with thin film transistor (TFT) monomer load 430) of this display panels 400 can be in a gate line time T
GridIn climb or drop to the gamma voltage current potential of appointment.
This sequential control digital circuit 320 is in order in a gate line time T
GridIn produce different digital signal combination AP0～APX according to the requirement of the load of this display panels 400, and these digital signals combinations AP0～APX the logic current potential of a digital signal only to be arranged at one time be 1.And the source electrode driver bias circuit 330 that should dynamically adjust produces the bias current I of different simulation current potentials according to aforesaid these digital signal combinations AP0～APX
The source Utmost point bias voltageWhen the logic current potential of digital signal AP0 was 1, the highest bias current I of the source electrode driver bias circuit 330 of dynamically adjustment had been selected in expression for use
The source electrode bias voltage
The method of operating of present embodiment is identical with aforementioned techniques, in a gate line time T
GridIn, with the bias current I of these gamma drivers 310
The source electrode bias voltageBe divided into multistage.In a gate line time T
GridInitial, it is 1 that this sequential control digital circuit 320 makes the logic current potential of digital signal AP0, makes this source electrode driver bias circuit of dynamically adjusting 330 produce higher bias current I
The source electrode bias voltage, make each gamma driver 310 produce enough driving forces, make the voltage V of the source electrode channel loading 420 of display panels 400
Source channelClimb or drop to the gamma voltage current potential of appointment.And in a gate line time T
GridThe most last, it is 1 that this sequential control digital circuit 320 makes the logic current potential of digital signal APX, makes this source electrode driver bias circuit of dynamically adjusting 330 produce minimum bias current I
The source electrode bias voltage, thereby make each gamma driver 310 produce stable driving force, make the voltage potential V of thin film transistor (TFT) monomer load 430
TFTClimb or drop to the gamma voltage current potential of appointment.
See also shown in Fig. 9 fourth embodiment of the present invention, present embodiment and last embodiment difference are that these gamma drivers 310 are can be by a plurality of gamma pre-drivers 311 and the resistance 312 (R between each gamma pre-driver 311
1～R
k) form, just the source electrode channel of each same gray level is to be driven by same resitstance voltage divider and source electrode driver.
This driven point is to be produced by these gamma pre-drivers 311 and resistance 312 dividing potential drops, and the number of driven point is identical with the grey exponent number of desiring to present.The number of these gamma pre-drivers 311 (1～Z) with the big peanut (R of the resistance 312 of dividing potential drop
1～R
k), decide on the engineering application.These gamma pre-drivers 311 are subjected to aforesaid bias current I
The source electrode bias voltageControl, make the pre-voltage potential V of gamma of input
The pre-voltage potential of gamma _ 1～V
Ga_pre_level_ZExport pre-voltage potential G
Prel～G
PreZ, produce required gray scale voltage G1～GM by these resistance 312 dividing potential drops again.
For these gray scale voltages G1～GM, select data (GS by a plurality of digital analog converters 340 according to numeral again as source electrode driver
00～GS
0Y..., GS
N0～GS
NY) suitable gray scale voltage G1～GM is transmitted out, make the load (source electrode channel loading 420 with thin film transistor (TFT) monomer load 430) of this display panels 400 can be in a gate line time T
GridIn climb or drop to the gamma voltage current potential of appointment.
This sequential control digital circuit 320 is in order in a gate line time T
GridIn produce different digital signal combination AP0～APX according to the requirement of the load of this display panels 400, and these digital signals combinations AP0～APX the logic current potential of a digital signal only to be arranged at one time be 1.And the source electrode driver bias circuit 330 that should dynamically adjust produces the bias current I of different simulation current potentials according to aforesaid these digital signal combinations AP0～APX
The source Utmost point bias voltageWhen the logic current potential of digital signal AP0 was 1, the highest bias current I of the source electrode driver bias circuit 330 of dynamically adjustment had been selected in expression for use
The source electrode bias voltage
The method of operating of present embodiment is in a gate line time T
GridIn, with the bias current I of these gamma pre-drivers 311
The source electrode bias voltageBe divided into multistage.In a gate line time T
GridInitial, it is 1 that this sequential control digital circuit 320 makes the logic current potential of digital signal AP0, makes this source electrode driver bias circuit of dynamically adjusting 330 produce higher bias current I
The source electrode bias voltage, make each gamma pre-driver 311 produce enough driving forces, make the voltage V of the source electrode channel loading 420 of display panels 400
Source channelClimb or drop to the gamma voltage current potential of appointment.And in a gate line time T
GridThe most last, it is 1 that this sequential control digital circuit 320 makes the logic current potential of digital signal APX, makes this source electrode driver bias circuit of dynamically adjusting 330 produce minimum bias current I
The source electrode bias voltage, thereby make each gamma pre-driver 311 produce stable driving force, make the voltage potential V of thin film transistor (TFT) monomer load 430
TFTClimb or drop to the gamma voltage current potential of appointment.
Above-mentioned is the preferred embodiments of the present invention only, is not to be used for limiting scope of the invention process.Any equivalent variations and modification of making according to the present patent application claim is all claim of the present invention and contains.
Claims (9)
1. a low power source driving device is used for the load on liquid crystal driver (100) driving display panels (200), it is characterized in that comprising:
Sequential control digital circuit (120), it is at a gate line time (T
Grid) in produce different digital signal combinations (AP0～APX), and the combination of described digital signal (it is 1 that AP0～APX) only has the logic current potential of a digital signal at one time;
The dynamic source electrode driver bias circuit of adjusting (130), (AP0～APX) produces the bias current (I of different simulation current potentials according to aforesaid described digital signal combination for it
The source electrode bias voltage); And
Multiple source driver (110), it is subjected to aforesaid bias current (I
The source electrode bias voltage) control, produce corresponding output driving force, make the load of described display panels (200) can be at a gate line time (T
Grid) in climb or drop to the gamma voltage current potential of appointment.
2. low power source driving device according to claim 1 is characterized in that, (AP0～APX) is at least the combination of two digital signals to the combination of described digital signal; And
(AP0～APX) produces the bias current (I of at least two simulation current potentials to the source electrode driver bias circuit (130) of described dynamic adjustment according to aforesaid described digital signal combination
The source electrode bias voltage), at each gate line time (T
Grid) beginning produce normal bias current (I
The source electrode bias voltage), make described source electrode driver (110) produce enough driving forces, the load voltage of described display panels (200) is climbed or drop to the gamma voltage current potential of appointment, and at remaining gate line time (T
Grid) at least one lower bias current (I of interior generation
The source electrode bias voltage), make described source electrode driver (110) produce stable driving force.
3. low power source driving device according to claim 2 is characterized in that, more near each gate line time (T
Grid) end, the bias current (I that the source electrode driver bias circuit (130) of described dynamic adjustment produces
The source electrode bias voltage) more little.
4. a low power source driving device is used for driving at liquid crystal driver (300) load of display panels (400), it is characterized in that comprising:
Sequential control digital circuit (320), it is at a gate line time (T
Grid) in produce different digital signal combinations (AP0～APX), and the combination of described digital signal (it is 1 that AP0～APX) only has the logic current potential of a digital signal at one time;
The dynamic source electrode driver bias circuit of adjusting (330), (AP0～APX) produces the bias current (I of different simulation current potentials according to aforesaid described digital signal combination for it
The source electrode bias voltage); And
A plurality of gamma drivers (310) are subjected to aforesaid bias current (I
The source electrode bias voltage) control, (G1～GM), (G1～GM) makes the load of described display panels (400) can be at a gate line time (T by the required gray scale voltage of a plurality of digital analog converters (340) output again to produce the gray scale voltage desire to present respectively
Grid) in climb or drop to the gamma voltage current potential of appointment.
5. low power source driving device according to claim 4 is characterized in that, (AP0～APX) is at least the combination of two digital signals to the combination of described digital signal; And
(AP0～APX) produces the bias current (I of at least two simulation current potentials to the source electrode driver bias circuit (330) of described dynamic adjustment according to aforesaid described digital signal combination
The source electrode bias voltage), wherein at each gate line time (T
Grid) beginning produce normal bias current (I
The source electrode bias voltage), make described gamma driver (310) produce enough driving forces, the load voltage of described display panels (400) is climbed or drop to the gamma voltage current potential of appointment, and at remaining gate line time (T
Grid) at least one lower bias current (I of interior generation
The source electrode bias voltage), make described gamma driver (310) produce stable driving force.
6. low power source driving device according to claim 5 is characterized in that, more near each gate line time (T
Grid) end, the bias current (I that the source electrode driver bias circuit (330) of described dynamic adjustment produces
The source electrode bias voltage) more little.
7. low power source driving device according to claim 4, it is characterized in that, described gamma driver (310) further is made up of a plurality of gamma pre-drivers (311) and the resistance (312) that is positioned between each described gamma pre-driver (311), is subjected to aforesaid bias current (I
The source electrode bias voltage) control, dividing potential drop produces the gray scale voltage desire to present (G1～GM) respectively.
8. low power source driving device according to claim 7 is characterized in that, (AP0～APX) is at least the combination of two digital signals to the combination of described digital signal; And
The source electrode driver bias circuit (330) of described dynamic adjustment makes up according to described digital signal that (AP0～APX) produces the bias current (I of at least two simulation current potentials
The source electrode bias voltage), wherein at each gate line time (T
Grid) beginning produce normal bias current (I
The source electrode bias voltage), make described gamma pre-driver (311) produce enough driving forces, the load voltage of described display panels (400) is climbed or drop to the gamma voltage current potential of appointment, and at remaining gate line time (T
Grid) at least one lower bias current (I of interior generation
The source electrode bias voltage), make described gamma pre-driver (311) produce stable driving force.
9. low power source driving device according to claim 7 is characterized in that, more near each gate line time (T
Grid) end, the bias current (I that the source electrode driver bias circuit (330) of described dynamic adjustment produces
The source electrode bias voltage) more little.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710165421XA CN101419782B (en) | 2007-10-25 | 2007-10-25 | Low power source driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710165421XA CN101419782B (en) | 2007-10-25 | 2007-10-25 | Low power source driving device |
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| CN2012100801941A Division CN102610203A (en) | 2007-10-25 | 2007-10-25 | Low-power source driving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101419782A true CN101419782A (en) | 2009-04-29 |
| CN101419782B CN101419782B (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710165421XA Active CN101419782B (en) | 2007-10-25 | 2007-10-25 | Low power source driving device |
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| CN (1) | CN101419782B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513551A (en) * | 2016-01-15 | 2016-04-20 | 深圳市华星光电技术有限公司 | Voltage generation circuit and liquid crystal television |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI581234B (en) * | 2016-03-25 | 2017-05-01 | Chipone Technology (Beijing)Co Ltd | Low power source drive circuit and display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05224621A (en) * | 1992-02-14 | 1993-09-03 | Toshiba Corp | Semiconductor device for power source for driving liquid crystal panel |
| KR100486254B1 (en) * | 2002-08-20 | 2005-05-03 | 삼성전자주식회사 | Circuit and Method for driving Liquid Crystal Display Device using low power |
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- 2007-10-25 CN CN200710165421XA patent/CN101419782B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513551A (en) * | 2016-01-15 | 2016-04-20 | 深圳市华星光电技术有限公司 | Voltage generation circuit and liquid crystal television |
| US9898994B1 (en) | 2016-01-15 | 2018-02-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Voltage generation circuit and liquid crystal television |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101419782B (en) | 2012-11-28 |
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