CN105632429A - Voltage follower and driving device - Google Patents
Voltage follower and driving device Download PDFInfo
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- CN105632429A CN105632429A CN201410709031.4A CN201410709031A CN105632429A CN 105632429 A CN105632429 A CN 105632429A CN 201410709031 A CN201410709031 A CN 201410709031A CN 105632429 A CN105632429 A CN 105632429A
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Abstract
The invention relates to a voltage follower and a driving device. The voltage follower includes a first operational amplifier and a second operational amplifier; the first operational amplifier plays a role of pull-down current driving; the negative input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier; the positive input end of the first operational amplifier is used for receiving first input voltage; the second operational amplifier plays a role of pull-up current driving; the negative input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier; the positive input end of the second operational amplifier is used for receiving second input voltage; the output end of the first operational amplifier is electrically connected with the output end of the second operational amplifier; and the first input voltage is higher than second input voltage.
Description
Technical field
The present invention is about a kind of voltage follower device, and especially with regard to the voltage follower device of a kind of driving device for liquid crystal display.
Background technology
In recent years, liquid crystal display is widely used in daily life, for instance, LCD TV, panel computer or notebook computer all use liquid crystal display as display screen. Liquid crystal display needs driving device to provide driving voltage so that it is can normal operation. Now, the environmental consciousness of people improves, and government policy also encourages carbon reduction, and therefore, driving device also tends to be designed to low-power consumption.
Refer to the circuit diagram that Fig. 1, Fig. 1 are a kind of traditional drives for liquid crystal display. Driving device 1 includes variable resistance VR and multiple resistance R1��R3. One end of variable resistance VR is electrically connected system voltage VCC, and the other end of variable resistance VR is electrically connected one end of resistance R1. The two ends of resistance R2 are electrically connected with the other end of resistance R1 and one end of resistance R3, and the two ends of resistance R3 are electrically connected with the other end and the low-voltage VSS (such as, ground voltage) of resistance R2.
By above-mentioned connected mode, variable resistance VR and resistance R1��R3 that driving device 1 can pass through to concatenate is to system voltage VCC dividing potential drop, to produce driving voltage VLCD, VL1 and VL2. But, driving device 1 needs the electric current consuming at least 20 �� A that enough driving forces just can be had to drive liquid crystal display, namely the consumption electric current 20 �� A of driving device 1, and therefore, the consumption power of driving device 1 is bigger, it is possible to compares and does not meet environmental protection trend.
It addition, also have a kind of driving device with voltage follower device to be suggested. Refer to the circuit diagram that Fig. 2, Fig. 2 are the another kind of traditional drives for liquid crystal display. Driving device 1 compared to Fig. 1, driving device 2 has voltage follower device 21��23 extraly, and wherein the input of voltage follower device 21��23 is electrically connected with one end of resistance R1��R3. By this kind of connected mode, voltage follower device 21��23 can effectively reduce the electric current flowing through variable resistance VR and resistance R1��R3 so that it is is reduced to 0.2 �� A from 20 �� A. But, voltage follower device 21��23, all momentarily in running, causes that voltage follower device 21��23 itself has bigger consumption electric current, therefore generally speaking, the consumption power of driving device 2 is still big, does not still meet environmental protection trend.
In addition, the driving device proposed at present can use electric charge pump (chargepump) to produce driving voltage, the consumption electric current overall thereby to reduce driving device, but this kind of driving device needs to set up multiple electric capacity extraly, therefore cause size and the cost increase of driving device.
Summary of the invention
The embodiment of the present invention provides a kind of voltage follower device, and described voltage follower device includes the first operational amplifier and the second operational amplifier. First operational amplifier drives as pull-down current, and the negative input end of the first operational amplifier is electrically connected the outfan of the first operational amplifier, and the positive input terminal of the first operational amplifier is in order to receive the first input voltage. Second operational amplifier drives as pull-up current, and the negative input end of the second operational amplifier is electrically connected the outfan of the second operational amplifier, and the positive input terminal of the second operational amplifier is in order to receive the second input voltage. The outfan of the first operational amplifier is electrically connected this outfan of the second operational amplifier, and the first input voltage is more than the second input voltage.
The embodiment of the present invention provides a kind of driving device, and this driving device is used for providing multiple driving voltage to liquid crystal display, and uses above-mentioned voltage follower device.
In sum, the voltage follower device that the embodiment of the present invention provides is less with the consumption electric current of the driving device using this voltage follower device so that the two consumes power and also and then declines. In addition, above-mentioned driving device can arrange electric capacity extraly, therefore its cost is all little with size.
It is further understood that inventive feature and technology contents for enabling, refers to the detailed description below in connection with the present invention and accompanying drawing, but these illustrate only to be used for appended accompanying drawing the present invention is described, but not the interest field of the present invention is done any restriction.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of traditional drives for liquid crystal display.
Fig. 2 is the circuit diagram of the another kind of traditional drives for liquid crystal display.
Fig. 3 is the circuit diagram of a kind of driving device for liquid crystal display that the embodiment of the present invention provides.
Fig. 4 is the circuit diagram of a kind of voltage follower device that the embodiment of the present invention provides.
Fig. 5 is the circuit diagram of a kind of first operational amplifier that the embodiment of the present invention provides.
Fig. 6 is the circuit diagram of a kind of second operational amplifier that the embodiment of the present invention provides.
Wherein, description of reference numerals is as follows:
1,2,3: driving device
VR: variable resistance
R1��R3: resistance
RD1, RD2: input resistance
21��23,31: voltage follower device
32,4: the first voltage follower device
33: the second voltage follower devices
41,5: the first operational amplifier
42,6: the second operational amplifier
N1��N3:N transistor npn npn
P1��P3:P transistor npn npn
I1, I2: current source
VCC: system voltage
VSS: low-voltage
VLCD: driving voltage
VL1: the first driving voltage
VL2: the second driving voltage
V1a: the first input voltage
V1b: the second input voltage
V2a, V2b: input voltage
Detailed description of the invention
Various exemplary embodiments will be more fully described referring to annexed drawings below, annexed drawings will be shown some exemplary embodiments. But, concept of the present invention is likely to embody in many different forms, and should not be construed as limited by exemplary embodiments set forth herein. Specifically, it is provided that these exemplary embodiments make the present invention for detailed and complete, and will will fully pass on the category of concept of the present invention to those who familiarize themselves with the technology. In all accompanying drawings, size and the relative size in Ceng Ji district can be lavished praise on oneself in order to know. Similar numeral indicates like all the time.
The embodiment of the present invention provides a kind of voltage follower device, and described voltage follower utensil has the first operational amplifier and the second operational amplifier, and wherein the first operational amplifier drives as pull-down current, and the second operational amplifier drives as pull-up current. The outfan of the first operational amplifier and the second operational amplifier is electrically connected to each other, and in order to produce driving voltage. The outfan of the first operational amplifier and the second operational amplifier is also electrically connected with the negative input end of the first operational amplifier and the second operational amplifier respectively, and forms two negative-feedback circuits. The positive input terminal of the first operational amplifier and the second operational amplifier connects the two ends of an input resistance respectively, and to receive the first input voltage and the second input voltage respectively, wherein the first input voltage is more than the second input voltage.
By above-mentioned connected mode, as driving voltage (VL1) (i.e. V1b<VL1<V1a) between the first input voltage (V1a) and the second input voltage (V1b), then the pull-down current function of the first operational amplifier and the pull-up current function of the second operational amplifier are closed, therefore global voltage following device only consumes atomic little steady-state current (being smaller than 0.3uA). When driving voltage is more than the first input voltage (VL1>V1a), then only has the first operational amplifier and can drive pull-down current, it is possible to driving voltage is pulled down under the first input voltage. When driving voltage is less than the second input voltage (VL1<V1b), then only has the second operational amplifier and can drive pull-up current, it is possible to driving voltage is pulled on the second input voltage.
It addition, the embodiment of the present invention also provides for a kind of driving device for liquid crystal display. Driving device includes variable resistance, multiple resistance, multiple input resistance and multiple voltage follower devices, wherein variable resistance and multiple resistant series, so that system voltage is carried out dividing potential drop. Additionally, each input resistance is electrically connected between two adjacent resistors, one of them voltage follower device is electrically connected one end of the variable resistance other end and one of them resistance, and two inputs of remaining each voltage follower device are electrically connected the two ends of one of them input resistance. Voltage follower device is in order to produce multiple driving voltage. The voltage follower device being electrically connected the two ends of one of them input resistance can be above-mentioned voltage follower device, therefore described driving device can not need additional electric capacity, namely can thereby reduce the overall electric current consumed. Therefore, the size using the driving device of above-mentioned voltage follower device all can be lowered effectively with consuming effect.
Refer to the circuit diagram that Fig. 3, Fig. 3 are a kind of driving devices for liquid crystal display that the embodiment of the present invention provides. Driving device 3 in order to produce driving voltage VLCD, the first driving voltage VL1, the second driving voltage VL2 that multiple liquid crystal display uses, and can include variable resistance VR, multiple resistance R1��R3, multiple input resistance RD1, RD2 and voltage follower device the 31, first voltage follower device the 32, second voltage follower device 33. One end of variable resistance VR is electrically connected system voltage VCC, and the other end of variable resistance VR is electrically connected one end of resistance R1. The two ends of input resistance RD1 are electrically connected with the other end of resistance R1 and one end of resistance R2, the two ends of input resistance RD2 are electrically connected with the other end of resistance R2 and one end of resistance R3, and the other end of resistance R3 is electrically connected low-voltage VSS (such as, ground voltage). The input of voltage follower device 31 is electrically connected one end of resistance R1, two inputs of the first voltage follower device 32 are electrically connected with the two ends of input resistance RD1, to receive input voltage V1a and V1b, and second two inputs of voltage follower device 33 be electrically connected with the two ends of input resistance RD2, to receive input voltage V2a and V2b.
The main purpose of variable resistance VR and multiple resistance R1��R3 is used to system voltage VCC is carried out dividing potential drop. Voltage follower device 31 can be only need have the voltage follower device that can pull up ability, or there is the voltage follower device of pull-up and the track to track (railtorail) of pull-down capability, it is in order to produce driving voltage VLCD, and wherein said driving voltage VLCD is substantially equal to the voltage on the variable resistance VR other end. It addition, first voltage follower device the 32, second voltage follower device 33 is the voltage follower device having pull-up with the track to track of pull-down capability, it is in order to produce driving voltage VL1 and VL2. Input resistance RD1, RD2 can through suitable designs, the voltage difference at its two ends is little, for instance, 10mV to 30mV, therefore, driving voltage VL1 and VL2 approximates VLCD* (R2+R3)/(R1+R2+R3) and VLCD*R3/ (R1+R2+R3) respectively. Still further aspect, beats scope owing to driving voltage VL1 and VL2 only has small voltage, for instance, 10mV to 30mV, therefore the display effect of the liquid crystal display without influence on rear end.
In the embodiment of the present invention, the major function of the first voltage follower device 32 is to allow driving voltage VL1 between input voltage V1a and V1b. Furthermore, the first voltage follower device 32 can have the first operational amplifier and the second operational amplifier. The pull-down capability of the first operational amplifier is relatively strong, when driving voltage VL1 is more than input voltage V1a, to be pulled down under input voltage V1a by the first driving voltage VL1. The pull-up ability of the second operational amplifier is relatively strong, when the first driving voltage VL1 is less than input voltage V1b, to be pulled on input voltage V1b by the first driving voltage VL1.
Similarly, the major function of the second voltage follower device 33 is to allow the second driving voltage VL2 between input voltage V2a and V2b. Furthermore, the second voltage follower device 33 can have the first operational amplifier and the second operational amplifier equally. The pull-down capability of the first operational amplifier is relatively strong, when the second driving voltage VL2 is more than input voltage V2a, to be pulled down under input voltage V2a by the second driving voltage VL2. The pull-up ability of the second operational amplifier is relatively strong, when the second driving voltage VL2 is less than input voltage V2b, to be pulled on input voltage V2b by the second driving voltage VL2.
Briefly, first operational amplifier and the second operational amplifier most of the time of the first voltage follower device 32 and the second voltage follower device 33 are not driven, therefore driving device only consumes atomic little steady-state current, and pull-down current and pull-up current will not be simultaneously driven. Only have at the first driving voltage VL1 not between input voltage V1a and the V1b at input resistance RD1 two ends, or second driving voltage VL2 not when the input voltage V2a and V2b at input resistance RD2 two ends, one of them of the first operational amplifier of the first voltage follower device 32 or the second voltage follower device 33 and the second operational amplifier just can drive pull-down current or pull-up current. Therefore, the electric current that the first voltage follower device 32 and the second voltage follower device 33 consume is extremely low, it is possible to lower than 0.3 �� A. Still further aspect, according to current complementary metal oxide semiconductor chip processing procedure, even if using the driving device 3 chip as very small dimensions, it flows through variable resistance VR, multiple resistance R1��R3 and also only has 0.2 �� about A with multiple input resistance RD1, RD2. Generally, the consumption electric current of driving device 3 can't be too big.
Subsidiary one is mentioned that, in the embodiment of the present invention, the quantity of driving voltage produced by driving device is also not used to the restriction present invention. The quantity principle of driving voltage produced by driving device is relevant to the quantity of resistance, input resistance and voltage follower device. For example, to produce N number of driving voltage, then driving device can have N number of resistance, N-1 input resistance and a N number of voltage follower device, and each of wherein N-1 voltage follower device can have the first operational amplifier as above and the second operational amplifier.
Refer to the circuit diagram that Fig. 4, Fig. 4 are a kind of voltage follower devices that the embodiment of the present invention provides. The circuit framework of the voltage follower device 4 of Fig. 4 is the implementation of the first voltage follower device 32 in Fig. 3 embodiment. Voltage follower device 4 includes the first operational amplifier 41 and the second operational amplifier 42, and wherein the first operational amplifier 41 drives as pull-down current, and the second operational amplifier 42 drives as pull-up current.
The outfan of the first operational amplifier 41 is electrically connected the outfan of the second operational amplifier 42, to export the first driving voltage VL1. The negative input end of the first operational amplifier 41 is electrically connected its outfan, becomes the first buffer by the negative-feedback circuit configuration formed, and the first input voltage V1a on one end of input resistance RD1 of receiving of the positive input terminal of the first operational amplifier 41. The negative input end of the second operational amplifier 42 is electrically connected its outfan, becomes the second buffer by the negative-feedback circuit configuration formed, and the second input voltage V1b on the other end of input resistance RD1 that receives of the positive input terminal of the second operational amplifier 42.
When the first driving voltage VL1 is more than the first input voltage V1a, the first operational amplifier 41 can drive pull-down current, and therefore, the first driving voltage VL1 can be pulled down under the first input voltage V1a by the first operational amplifier 41. On the contrary, when the first driving voltage VL1 is less than the second input voltage V1b, the second operational amplifier 42 can drive pull-up current, therefore, the first driving voltage VL1 can be pulled on the second input voltage V1b by the second operational amplifier 42.
Thus it is appreciated that, when the first driving voltage VL1 is between the first input voltage V1a and the second input voltage V1b (namely when the first driving voltage VL1 is in stable state, i.e. V1b < VL1 < V1a), above-mentioned first operational amplifier 41 and the second operational amplifier 42 all will not drive pull-down current and pull-up current. Additionally, when first driving voltage VL1 is more than the first input voltage V1a or less than the second input voltage V1b (namely when the first driving voltage VL1 is in unstable state), only has the first operational amplifier 41 and drive pull-down current or the second operational amplifier 42 to drive pull-up current. No matter how the first driving voltage VL1 changes, first operational amplifier 41 and the second operational amplifier 42 can't each simultaneously drive pull-down current and pull-up current, and first driving voltage VL1 most time be in stable state, and to be both one of them time can drive pull-down current or pull-up current in the portion that only has less, accordingly, the consumption electric current of voltage follower device 4 is minimum, for instance, lower than 0.3 �� A.
It should be noted that, although Fig. 4 embodiment introduces the implementation of the first voltage follower device 32 in Fig. 3 embodiment, but skilled artisan can push away to obtain the implementation of the second voltage follower device 33 in Fig. 3 embodiment from the circuit framework of voltage follower device 4, therefore the implementation repeated description of the second voltage follower device 33 being not in Fig. 3 embodiment. Briefly, the circuit framework of the first voltage follower device 32 is same as the circuit framework of the second voltage follower device 33.
Then, illustrate that the one of which of the first operational amplifier 41 is likely to mode further. Although the one of which that the examples below is the first operational amplifier 41 to the first voltage follower device 32 is likely to mode, but as described earlier, skilled artisan can learn that the circuit framework of the circuit framework of the first operational amplifier of the first voltage follower device 32 and the first operational amplifier 41 of the second voltage follower device 33 is identical accordingly.
Refer to the circuit diagram that Fig. 5, Fig. 5 are a kind of first operational amplifiers 5 that the embodiment of the present invention provides. First operational amplifier 5 can in order to realize the first operational amplifier 41 of above-mentioned first voltage follower device 32, but the present invention is not restricted to this. First operational amplifier 5 includes multiple N-type transistor N1��N3 (such as, N-type metal oxide semiconductor transistor), multiple P-type transistor P1, P2 (such as, P-type mos transistor) such as can current source I1, I2 less than 0.1uA with two.
The grid of N-type transistor N1 is electrically connected the drain electrode of drain electrode and the P-type transistor P1 of the grid of N-type transistor N2, N-type transistor N1, the source electrode of N-type transistor N1��N3 is electrically connected low-voltage VSS, and the drain electrode of N-type transistor N2 is electrically connected the grid of N-type transistor N3 and the drain electrode of P-type transistor P2. The drain electrode of N-type transistor N3 is electrically connected the grid of P-type transistor P1 and one end of current source I2, and the other end in order to produce the first driving voltage VL1, current source I2 is electrically connected system voltage VCC. One end of current source I1 is electrically connected the source electrode of P-type transistor P1, P2, and the other end of current source I1 is electrically connected system voltage VCC, and the grid of P-type transistor P2 receives the first input voltage V1a.
By above-mentioned connected mode, the first operational amplifier 5 configuration is the first buffer, and VL1 load is driven as pull-down current. When unstable state, when the first driving voltage VL1 is more than the first input voltage V1a, flow through P-type transistor P1 electric current can less than the electric current flowing through P-type transistor P2, therefore, N-type transistor N3 can turn on, and the first driving voltage VL1 is pulled down under the first input voltage V1a. Therefore, if coordinating above-mentioned second operational amplifier 42 collocation to use, the first driving voltage VL1 can be comparable to the first input voltage V1a when stable state, but less than the first input voltage V1a.
Then, illustrate that the one of which of the second operational amplifier 42 is likely to mode further. Although the one of which that the examples below is the second operational amplifier 42 to the first voltage follower device 32 is likely to mode, but as described earlier, skilled artisan can learn that the circuit framework of the circuit framework of the second operational amplifier of the first voltage follower device 32 and the second operational amplifier 42 of the second voltage follower device 33 is identical accordingly.
Refer to the circuit diagram that Fig. 6, Fig. 6 are a kind of second operational amplifiers 6 that the embodiment of the present invention provides. Second operational amplifier 6 can in order to realize the second operational amplifier 42 of above-mentioned first voltage follower device 32, but the present invention is not restricted to this. Second operational amplifier 6 includes multiple P-type transistor P1��P3 (such as, P-type mos transistor), multiple N-type transistor N1, N2 (such as, N-type metal oxide semiconductor transistor) such as can current source I1, I2 less than 0.1uA with two.
The grid of P-type transistor P1 is electrically connected the drain electrode of drain electrode and the N-type transistor N1 of the grid of P-type transistor P2, P-type transistor P1, the source electrode of P-type transistor P1��P3 is electrically connected system voltage VCC, and the drain electrode of P-type transistor P2 is electrically connected the grid of P-type transistor P3 and the drain electrode of N-type transistor N2. The drain electrode of P-type transistor P3 is electrically connected the grid of N-type transistor N1 and one end of current source I2, and the other end in order to produce the first driving voltage VL1, current source I2 is electrically connected low-voltage VSS. One end of current source I1 is electrically connected the source electrode of N-type transistor N1, N2, and the other end of current source I1 is electrically connected low-voltage VSS, and the grid of N-type transistor N2 receives the second input voltage V1b.
By above-mentioned connected mode, the second operational amplifier 6 configuration is the second buffer, and VL1 load is driven as pull-up current. When unstable state, when the first driving voltage VL1 is less than the second input voltage V1b, flow through N-type transistor N1 electric current can less than the electric current flowing through P-type transistor P2, therefore, P-type transistor P3 can turn on, and driving voltage VL1 is pulled on the second input voltage V1b. Therefore, if coordinating above-mentioned first operational amplifier 41 collocation to use, the first driving voltage VL1 can be comparable to the second input voltage V1b when stable state, but more than the second input voltage V1b.
In sum, the first voltage follower device 32 that the embodiment of the present invention provides is (or the second voltage follower device 33 is when the second driving voltage VL2 is stable) when the first driving voltage VL1 is stable, all will not each simultaneously drive pull-down current and pull-up current and only expend small steady-state current (being smaller than 0.3uA), it only has when the first driving voltage VL1 (or second driving voltage VL2) is more than the first input voltage or less than the second input voltage, the first operational amplifier or the second operational amplifier that just can make correspondence start to drive pull-down current or pull-up current, use and the first driving voltage VL1 (or second driving voltage VL2) is pulled down under the first input voltage or is pulled on the second input voltage. accordingly, the driving device that the embodiment of the present invention provides is because using above-mentioned first voltage follower device the 32, second voltage follower device 33, it is possible to effectively reduce overall consumption electric current so that overall consumption power also and then declines. in addition, above-mentioned driving device need not arrange electric capacity extraly, therefore its cost is all little with size.
The above, be only the specific embodiment that the present invention is best, and only inventive feature is not limited thereto, any those skilled in the art in the field of the invention, can think easily and change or modification, all can be encompassed in the scope of the claims of the present invention.
Claims (10)
1. a voltage follower device, in order to produce a driving voltage, it is characterised in that comprising:
One first operational amplifier, drives as pull-down current, and one negative input end is electrically connected one outfan, and a positive input terminal is in order to receive one first input voltage; And
One second operational amplifier, drives as pull-up current, and one negative input end is electrically connected one outfan, and a positive input terminal is in order to receive one second input voltage;
Wherein this outfan of this first operational amplifier is electrically connected this outfan of this second operational amplifier, and this first input voltage is more than this second input voltage.
2. voltage follower device as claimed in claim 1, wherein this first input voltage differs 10mV to 30mV with this second input voltage.
3. voltage follower device as claimed in claim 1, wherein when stable state, this first operational amplifier and this second operational amplifier are all without driving pull-down current or pull-up current, so that this driving voltage is between this first input voltage and this second input voltage; When unstable state, if this driving voltage is more than this first input voltage, then only have this first operational amplifier and drive pull-down current, this driving voltage is pulled down under this first input voltage, if this driving voltage is less than this second input voltage, then only have this second operational amplifier and drive pull-up current, so that this driving voltage is pulled on this second input voltage.
4. voltage follower device as claimed in claim 1, wherein this first operational amplifier includes:
One first current source, one end is electrically connected a system voltage;
One second current source, one end is electrically connected this system voltage, and its other end is electrically connected this outfan of this first operational amplifier;
One first P-type transistor, one source electrode is electrically connected the other end of this first current source, and one grid is electrically connected this outfan of this first operational amplifier;
One second P-type transistor, one source electrode is electrically connected this other end of the first current source, and one grid is in order to receive this first input voltage;
One first N-type transistor, one grid is electrically connected a drain electrode of one drain electrode and this first P-type transistor, and one source electrode is electrically connected a low-voltage;
One second N-type transistor, one grid is electrically connected this grid of this first N-type transistor, and one drain electrode is electrically connected a drain electrode of this second P-type transistor, and one source electrode is electrically connected this low-voltage; And
One the 3rd N-type transistor, one grid is electrically connected this drain electrode of this second N-type transistor, and one source electrode is electrically connected this low-voltage, and one drain electrode is electrically connected this outfan of this first operational amplifier.
5. voltage follower device as claimed in claim 1, wherein this second operational amplifier includes:
One first current source, one end is electrically connected a low-voltage;
One second current source, one end is electrically connected a low-voltage, and its other end is electrically connected this outfan of this second operational amplifier;
One first N-type transistor, one source electrode is electrically connected the other end of this first current source, and one grid is electrically connected this outfan of this second operational amplifier;
One second N-type transistor, one source electrode is electrically connected this other end of the first current source, and one grid is in order to receive this second input voltage;
One first P-type transistor, one grid is electrically connected a drain electrode of one drain electrode and this first N-type transistor, and one source electrode is electrically connected a system voltage;
One second P-type transistor, one grid is electrically connected this grid of this first P-type transistor, and one drain electrode is electrically connected a drain electrode of this second N-type transistor, and one source electrode is electrically connected a system voltage; And
One the 3rd P-type transistor, one grid is electrically connected this drain electrode of this second P-type transistor, and one source electrode is electrically connected this system voltage, and one drain electrode is electrically connected this outfan of this second operational amplifier.
6. a driving device, is used for producing multiple driving voltage to a liquid crystal display, it is characterised in that including:
One variable resistance, its one end is electrically connected a system voltage;
One first resistance, its one end is electrically connected this variable-resistance other end;
One first input resistance, its one end is electrically connected the other end of this first resistance;
One second resistance, its one end is electrically connected the other end of this first input resistance;
One second input resistance, its one end is electrically connected the other end of this second resistance;
One the 3rd resistance, its one end is electrically connected the other end of this second input resistance, and its other end is electrically connected a low-voltage;
One voltage follower device, one input end is electrically connected this this other end variable-resistance, and one outfan is in order to export a driving voltage;
One first voltage follower device, one first input end and one second input are electrically connected with this one end and this other end of this first input resistance, and one outfan is in order to export one first driving voltage; And
One second voltage follower device, one first input end and one second input are electrically connected with this one end and this other end of this second input resistance, and one outfan is in order to export one second driving voltage;
Wherein this first voltage follower device, the second voltage follower device, all include:
One first operational amplifier, drives as pull-down current, and one negative input end is electrically connected one outfan, and a positive input terminal receives one first input voltage; And
One second operational amplifier, drives as pull-up current, and one negative input end is electrically connected one outfan, and a positive input terminal receives one second input voltage;
Wherein this outfan of this first operational amplifier is electrically connected this outfan of this second operational amplifier, and this first input voltage is more than this second input voltage.
7. driving device as claimed in claim 6, wherein differs 10mV to 30mV between this first input voltage with this second input voltage.
8. driving device as claimed in claim 6, wherein when stable state, this first operational amplifier and this second operational amplifier, without drop-down or pulling drive electric current, only expend and maintain electric current, so that this first, second driving voltage is between this first input voltage and this second input voltage; When unstable state, if this first or second driving voltage is more than this corresponding first input voltage, then only have this corresponding first operational amplifier and drive pull-down current, so that this first or second driving voltage is pulled down under this corresponding first input voltage, if this first or second driving voltage is less than this corresponding second input voltage, then only have this corresponding second operational amplifier and drive pull-up current, so that this first or second driving voltage is pulled on this corresponding second input voltage.
9. driving device as claimed in claim 6, wherein this first operational amplifier includes:
One first current source, one end is electrically connected a system voltage;
One second current source, one end is electrically connected this system voltage, and its other end is electrically connected this outfan of this first operational amplifier;
One first P-type transistor, one source electrode is electrically connected the other end of this first current source, and one grid is electrically connected this outfan of this first operational amplifier;
One second P-type transistor, one source electrode is electrically connected this other end of the first current source, and one grid is in order to receive this first input voltage;
One first N-type transistor, one grid is electrically connected a drain electrode of one drain electrode and this first P-type transistor, and one source electrode is electrically connected a low-voltage;
One second N-type transistor, one grid is electrically connected this grid of this first N-type transistor, and one drain electrode is electrically connected a drain electrode of this second P-type transistor, and one source electrode is electrically connected this low-voltage; And
One the 3rd N-type transistor, one grid is electrically connected this drain electrode of this second N-type transistor, and one source electrode is electrically connected this low-voltage, and one drain electrode is electrically connected this outfan of this first operational amplifier.
10. driving device as claimed in claim 6, wherein this second operational amplifier includes:
One first current source, one end is electrically connected a low-voltage;
One second current source, one end is electrically connected this low-voltage, and its other end is electrically connected this outfan of this second operational amplifier;
One first N-type transistor, one source electrode is electrically connected the other end of this first current source, and one grid is electrically connected this outfan of this second operational amplifier;
One second N-type transistor, one source electrode is electrically connected this other end of the first current source, and one grid is in order to receive this second input voltage;
One first P-type transistor, one grid is electrically connected a drain electrode of one drain electrode and this first N-type transistor, and one source electrode is electrically connected a system voltage;
One second P-type transistor, one grid is electrically connected this grid of this first P-type transistor, and one drain electrode is electrically connected a drain electrode of this second N-type transistor, and one source electrode is electrically connected a system voltage; And
One the 3rd P-type transistor, one grid is electrically connected this drain electrode of this second P-type transistor, and one source electrode is electrically connected this system voltage, and one drain electrode is electrically connected this outfan of this second operational amplifier.
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Application publication date: 20160601 |