CN101192378A - System capable of regulating drive ability of output stage - Google Patents
System capable of regulating drive ability of output stage Download PDFInfo
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- CN101192378A CN101192378A CNA2006101486544A CN200610148654A CN101192378A CN 101192378 A CN101192378 A CN 101192378A CN A2006101486544 A CNA2006101486544 A CN A2006101486544A CN 200610148654 A CN200610148654 A CN 200610148654A CN 101192378 A CN101192378 A CN 101192378A
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Abstract
Disclosed is a drive alignment circuit which increases the drive ability of an amplifier through increasing a drive current to the output stage of the amplifier. The drive alignment circuit can adjust the drive ability according to external load condition, thereby can not only solve the problem that the drive ability of the digital-analog converter is deficiency, but also can change the drive ability of the amplifier according to the external load condition, further more can effectively reduce the unnecessary power consumption of the amplifier, thereby increasing the degree of stability of the system.
Description
Technical field
The system that the present invention adjusts relevant for a kind of driving force, and particularly relevant for a kind of system and application that is applicable to that the output stage driving force is adjusted.
Background technology
(consumer is also more and more high for the requirement of LCD for Liquid Crystal Display, LCD) flourish along with LCD in recent years.No matter be large-sized display, notebook computer or LCD TV, or undersized high resolving power colour screen handset, personal digital assistant (PersonalDigital Assistant, PDA) or global position system (Global Position System, GPS).The consumer not only requires product functionality strong, also requires system stability and has low power consumption concurrently simultaneously.And in conventional art, all can operate as normal in order to ensure each element in the circuit, often give too high driving force.Yet these too high driving forces but can cause the unnecessary power consumption of system, cause system temperature to raise.And the too high meeting of the temperature of system makes system's instability.If can avoid using too high driving force just can save power consumption, can certainly increase stiffness of system.
Fig. 1 is expressed as known pixel driving circuit synoptic diagram, please refer to Fig. 1.In the known technology, pixel-driving circuit 100 is made of D/A conversion unit 120 and operational amplifier unit 130.Wherein D/A conversion unit 120 couples mutually with operational amplifier unit 130.D/A conversion unit 120 comprises digital to analog converter 121-122, and transfers digital signal to simulating signal by digital to analog converter 121-122, and exports to operational amplifier 131-132.Operational amplifier 131-132 in the operational amplifier unit 130 is in order to strengthen the driving force of pixel-driving circuit 100, in order to drive the sub-pixel unit 111-112 in the panel 110.
It should be noted that panel 110 required driving forces also will be different when the technology of sharpness when panel 110, size, manufacturing was different.But in the conventional ADS driving process, the driving force of operational amplifier 131-132 is fixing hard and fast.Therefore on using, the load of tube face plate 110 is not big or little, and the only exportable identical driving force of operational amplifier 131-132 can't be regulated its driving force with load.Bigger if run into panel 110 sizes in the conventional art, when required drive current was higher, the driving force of operational amplifier 131-132 then was not enough to promote the sub-pixel unit 111-112 of panel 110.The picture contrast that therefore can cause panel 110 to be presented is not enough and influence display quality.And in order successfully to drive the sub-pixel unit 111-112 in the panel 110.Conventional art can use the excessive operational amplifier 131-132 of driving force usually.So the practice not only can cause unnecessary power consumption.And these unnecessary and unnecessary power consumptions can cause the temperature increase of system, and become one of unsettled risk of system.
In view of this, suitable settling mode there's no one who doesn't or isn't is eager to seek in the relevant manufacturer of panel, to overcome above-mentioned problem.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of driving to adjust circuit, and this driving is adjusted the load state of the visual outside of circuit and changed its output driving force.
A further object of the present invention provides a kind of pixel-driving circuit, and the load state of the visual panel of this pixel-driving circuit changes its output driving force, makes it be applicable to the panel of different size.
Another object of the present invention provides a kind of display device, this display device has the load state according to display device, and the size of variable its driving force provides suitable driving force, avoid the rising of the temperature that consumption causes of unnecessary power, the stability that reaches system promotes.
For reaching above-mentioned and other purpose, the present invention proposes a system, comprises output stage and drives the adjustment circuit.Wherein output stage has output terminal.Driving the adjustment circuit directly provides drive current to output terminal, to adjust the driving force of output stage.
The described system of preferred embodiment according to the present invention wherein drives and adjusts circuit, is applicable to the driving force of adjusting operational amplifier, and operational amplifier comprises output stage, and output stage is coupled between operating voltage and the earth terminal, and has output terminal.This driving is adjusted circuit and is comprised first current source cell and second current source cell.Wherein, first current source cell is coupled between operating voltage and the output terminal.Second current source cell is coupled between output terminal and the earth terminal.Wherein, drive and adjust the magnitude of current of circuit, adjust the drive current of output stage according to first current source and the conducting of second current source institute.
The described system of preferred embodiment according to the present invention, wherein output stage comprises the first transistor and transistor seconds.Wherein the first transistor is coupled between operating voltage and the output terminal, and the control end of the first transistor is coupled to first bias voltage.Transistor seconds is coupled between output terminal and the earth terminal, and the control end of transistor seconds is coupled to second bias voltage.Wherein, operational amplifier can be operational amplifier.And operational amplifier is adjusted first bias voltage and second bias voltage according to input signal, to adjust the drive current of output stage.
For reaching above-mentioned or other purposes, the present invention proposes a kind of digiverter and comprises digital to analog converter, operational amplifier and driving adjustment circuit.Wherein the digital to analog converter receiving digital signals produces simulating signal with conversion.Operational amplifier receives simulating signal to drive output.Drive the adjustment circuit output terminal of drive current to operational amplifier directly is provided, to adjust the driving force of operational amplifier.
The described digiverter of preferred embodiment according to the present invention comprises digital to analog converter, operational amplifier and driving adjustment circuit.Wherein digital to analog converter produces simulating signal according to digital signal.Operational amplifier has output stage.Operational amplifier is coupled to digital to analog converter, and according to this simulating signal, via the output stage outputting drive voltage.Output stage is coupled between operating voltage and the earth terminal.Drive and adjust the output stage that circuit is coupled to operational amplifier, in order to adjust the drive current of output stage.
The described digiverter of preferred embodiment according to the present invention, wherein output stage comprises the first transistor and transistor seconds.Wherein, the first transistor is coupled between operating voltage and the output terminal, and the control end of the first transistor is coupled to first bias voltage.Transistor seconds is coupled between output terminal and the earth terminal, and the control end of transistor seconds is coupled to second bias voltage.Wherein, operational amplifier is adjusted first bias voltage and second bias voltage according to input signal, to adjust the drive current of output stage.
For reaching above-mentioned or other purposes, the present invention proposes a kind of display device and comprises panel, output stage and driving adjustment circuit.Wherein panel has a plurality of sub-pixel unit.Output stage is in order to receive picture signal and to pass through the output terminal output image signal.Driving the adjustment circuit directly provides drive current to output terminal, to adjust the ability that input stage drives panel.
The described display device of preferred embodiment according to the present invention comprises panel and control circuit.Wherein panel has a plurality of sub-pixel unit.A plurality of pixel-driving circuits are in order to order driven element pixel cell.Control circuit is coupled to pixel-driving circuit, in order to adjust the driving force of pixel-driving circuit.Wherein, each pixel-driving circuit has to drive adjusts circuit, and control circuit is adjusted circuit via driving, and adjusts the drive current of corresponding above-mentioned pixel-driving circuit.
The described display device of preferred embodiment according to the present invention, wherein each pixel-driving circuit comprises operational amplifier.Operational amplifier has output stage.Operational amplifier is according to simulating signal, via the output stage outputting drive voltage.Output stage is coupled between operating voltage and the earth terminal.Wherein, circuit is adjusted in above-mentioned driving, is coupled to the output stage of operational amplifier, in order to adjust the drive current of output stage.
The described display device of preferred embodiment according to the present invention, this display device comprises panel, a plurality of pixel-driving circuit and control circuit.Wherein panel has a plurality of sub-pixel unit.Pixel-driving circuit is in order to order driven element pixel cell.Control circuit is coupled to above-mentioned pixel-driving circuit.Wherein, pixel-driving circuit has first current source cell and second current source cell, and control circuit is via the magnitude of current of adjusting first current source cell and the conducting of second current source cell institute, to adjust the drive current of above-mentioned pixel-driving circuit.
The described display device of preferred embodiment according to the present invention, wherein above-mentioned pixel-driving circuit comprises operational amplifier.Operational amplifier has output stage.Operational amplifier is according to simulating signal, via the output stage outputting drive voltage.Output stage is coupled between operating voltage and the earth terminal.Wherein, first current source cell is coupled between operating voltage and the output terminal, and second current source cell is coupled between output terminal and the earth terminal.
Based on above-mentioned, the present invention adjusts circuit because of adopting a kind of driving, by increasing the electric current of amplifier output stage, increases the driving force of amplifier.Circuit is adjusted in this driving can adjust driving force according to the load state of outside.Not only can solve the problem of digital to analog converter driving force deficiency, also can change the driving force of its amplifier, more can effectively reduce the unnecessary power consumption of amplifier, improve stiffness of system according to the load state of outside.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Description of drawings
Fig. 1 is expressed as known pixel driving circuit synoptic diagram.
Fig. 2 A is the represented a kind of structural drawing of adjusting the operational amplifier of driving force of preferred embodiment according to the present invention.
Fig. 2 B is the circuit diagram of unity gain circuit according to another embodiment of the present invention.
Fig. 2 C drives the circuit diagram of adjusting circuit according to another embodiment of the present invention.
Fig. 2 D is the circuit diagram of driving adjustment circuit according to yet another embodiment of the invention.
Fig. 3 is the represented a kind of circuit diagram of adjusting the operational amplifier of driving force of preferred embodiment according to the present invention.
Fig. 4 is the pixel-driving circuit synoptic diagram of the amplifier of the represented driving force adjusted of preferred embodiment according to the present invention.
Fig. 5 is the display device synoptic diagram of the amplifier of the represented driving force adjusted of preferred embodiment according to the present invention.
Fig. 6 is the display device synoptic diagram that the represented control circuit of preferred embodiment is applied to adjust driving force according to the present invention.
The main element symbol description
100,501-503,601-603: pixel-driving circuit
120: D/A conversion unit
130: the operational amplifier unit
20,121-122,40: digital to analog converter
131-132,290: operational amplifier
111-112,511-513: sub-pixel unit
110,57: panel
25,292: output stage
22,280,2800: drive and adjust circuit
2810: the first order drives adjusts circuit
2820: the second level drives adjusts circuit
2830: the third level drives adjusts circuit
23,24,282,284: current source cell
270: the unity gain circuit
200-206,251,232,234,236,286,294,2813:P transistor npn npn
207-210,252-254,242,244,246,288,296,2814:N transistor npn npn
211: electric capacity
212: resistance
30,60: control circuit
231,233,235,241,243,245,2811,2812: change-over switch
300-303: phase inverter
304: or door
305: with door
Embodiment
In following all embodiment, when element was regarded as " connection " or " coupling " to another element, it can be direct connection or is coupled to another element, maybe may have intervenient element.The present invention be for can adjusting the system of driving force, below is example with the circuit structure, and major technique means of the present invention are described.
Fig. 2 A is the represented a kind of structural drawing of adjusting the operational amplifier of driving force of preferred embodiment according to the present invention, please refer to Fig. 2 A.Drive and adjust the output terminal VOUT that circuit 22 is coupled to operational amplifier 20, in order to strengthen the drive current of output stage 25.Output stage 25 is an amplifying circuit.Operational amplifier 20 comprises output stage 25.Wherein output stage 25 is coupled between operating voltage VDD and the earth terminal GND, and has output terminal VOUT.Drive and adjust the formation current source circuit that circuit 22 comprises that current source cell 23 and current source cell 24 make.Current source cell 23 and current source cell 24 are respectively coupled to the output terminal VOUT of operational amplifier 20.Wherein receive simulating signals and it is amplified by operational amplifier 20, and by the output terminal output driving current of output stage 25.Because the output driving force of operational amplifier 20 is fixed.But in different application, the loading condition that its operational amplifier 20 connects can the change to some extent with the application difference of outside.When the external loading that connects hour, can cause redundant power consumption; When the external loading that connects is excessive, can cause the driving force deficiency.Therefore adjust circuit 22 by driving, the just load condition that can be connected according to operational amplifier 20 is further adjusted the output driving force of operational amplifier 20.On using, can avoid operational amplifier 20 to produce the problem of redundant power consumption or driving force deficiency, make it on system applies, have bigger elasticity.
In another embodiment of the present invention, operational amplifier 20 can be operational amplifier, shown in Fig. 2 B.Fig. 2 B is the circuit diagram of unity gain circuit according to another embodiment of the present invention.Unity gain circuit 270 comprises operational amplifier 290 and drives adjustment circuit 280, drives and adjusts the output terminal VOUT that circuit 280 is coupled to operational amplifier 290, in order to strengthen the current driving ability of operational amplifier 290.In the present embodiment, the negative input end of operational amplifier 290 is coupled to output terminal VOUT, and positive input terminal then is coupled to input signal VIN, in order to form unity gain circuit 270.In another embodiment of the present invention, if input signal VIN is a differential wave, then can be via the negative input end and the positive input terminal input signal of operational amplifier 290, those skilled in the art, via of the present invention open, should know its application mode and principle of work easily by inference, not add tired stating at this.
And but the unity gain circuit 270 of Fig. 2 B embodiment as the impact damper in the source electrode driver, is used for strengthening the driving force of source electrode driver to pixel also in the application surface drive circuit.When the load of the required driving of panel drive circuit not simultaneously, only need change and drive the driving force that the magnitude of current of adjusting institute's conducting in the circuit 280 can increase source electrode driver.
Next, further specify current source cell 282,284 wherein a kind of designs among Fig. 2 B embodiment.Fig. 2 C drives the circuit diagram of adjusting circuit according to another embodiment of the present invention, please refer to Fig. 2 C.If output stage 292 is series between operating voltage VDD and the earth terminal GND by P transistor npn npn (P-type Metal Oxide Semiconductor) 294 and N transistor npn npn (N-type Metal Oxide Semiconductor) 296 and forms.Output stage 292 comprises P transistor npn npn 294 and N transistor npn npn 296, and P transistor npn npn 294 is output terminal VOUT with the common points of N transistor npn npn 296.The grid of P transistor npn npn 294 then is coupled to working bias voltage VB1, and the grid of N transistor npn npn 296 is coupled to working bias voltage VB2.Working bias voltage VB1, VB2 are provided by operational amplifier 290 internal circuits.It is then similar to the circuit structure of output stage 292 to drive adjustment circuit 280, is series between operating voltage VDD and the earth terminal GND by P transistor npn npn 286 and N transistor npn npn 288 and forms.
In the present embodiment, can adjust the driving force of output stage 292 via the control P transistor npn npn 286 and the grid voltage of N transistor npn npn 288.For example the grid with P transistor npn npn 286 is coupled to working bias voltage VB1, and the grid of N transistor npn npn 288 is coupled to working bias voltage VB2.And working bias voltage VB1, VB2 are also provided by operational amplifier 290 internal circuits.Because it is identical with the structure of output stage 292 to drive adjustment circuit 280, therefore, output stage 292 can double at the drive current of output terminal VOUT, the driving force that equivalence just doubles.In also visual its demand of those skilled in the art, continuing increases the circuit structure that drives adjustment circuit 280 to be similar to the circuit design mode of output stage 292, increases its drive current with this, does not repeat them here.
Please refer to Fig. 2 D, Fig. 2 D drives the circuit diagram of adjusting circuit according to another embodiment of the present invention.In another embodiment of the present invention, drive adjustment circuit 280 and can form several grades of sequential circuits according to output stage 292, allow the driving force of output stage 292 have more flexible adjustment capability, and adjust the driving force of output stage 292 by control circuit 60.Wherein output stage 292 is identical with the embodiment of Fig. 2 C, does not repeat them here.It should be noted that driving the first order driving adjustment circuit 2810 of adjusting circuit 2800 comprises P transistor npn npn 2813 and N transistor npn npn 2814.P transistor npn npn 2813 and N transistor npn npn 2814 are series between operating voltage VDD and the earth terminal GND.The grid of P transistor npn npn 2813 is coupled to change-over switch 2811.Change-over switch 2811 makes the grid of P transistor npn npn 2813 be coupled to working bias voltage VB1 or operating voltage VDD according to the grid that the control signal C1 of control circuit 60 outputs switches P transistor npn npn 2813.When control signal C1 was logical zero, the grid of P transistor npn npn 2813 was coupled to operating voltage VDD, and P transistor npn npn 2813 does not have the conducting electric current; When control signal C1 is logical one, the grid of P transistor npn npn 2813 is coupled to working bias voltage VB1,2813 of P transistor npn npns are because its width/passage length (W/L) is identical with the width/passage length of the P transistor npn npn 294 of output stage 292, so P transistor npn npn 2813 has the conducting electric current identical with P transistor npn npn 294.
The grid of N transistor npn npn 2814 is coupled to change-over switch 2812.Change-over switch 2812 makes the grid of N transistor npn npn 2814 be coupled to working bias voltage VB2 or earth terminal GND according to the grid that the control signal C1 of control circuit 60 outputs switches N transistor npn npn 2814.When control signal C1 was logical zero, the grid of N transistor npn npn 2814 was coupled to earth terminal GND, and N transistor npn npn 2814 does not have the conducting electric current; When control signal C1 was logical one, the grid of N transistor npn npn 2814 was coupled to working bias voltage VB2, and 2814 of N transistor npn npns have the conducting electric current of the N transistor npn npn 296 of output stage of being same as 292.Therefore when control signal C1 was logical one, P transistor npn npn 2813 all had the conducting electric current with N transistor npn npn 2814, and this conducting electric current can make output stage 292 strengthen driving force.
Those skilled in the art, via of the present invention open, should know 2800 interior the having of driving adjustment circuit easily by inference and drive the second level driving adjustment circuit 2820 of adjustment circuit 2810 identical components and application mode and the principle of work that the third level drives adjustment circuit 2830 with the first order.According to control circuit 60 output control signal C2 and C3, control second level driving adjustment circuit 2820 respectively and adjust circuit 2830 with third level driving, make the driving force of its adjustment output stage 292, do not add to tire out at this and state.In addition, each P transistor npn npn that circuit 2800 is adjusted in above-mentioned driving also can be considered current source cell, and each N transistor npn npn also can be considered another current source cell.
In another embodiment of the present invention, current source cell 23,24 can design according to the circuit structure of output stage 25, and utilizes identical working bias voltage to make the driving force of output stage 25 obtain adding of multiple and take advantage of effect.Fig. 3 is the represented a kind of circuit diagram of adjusting the operational amplifier of driving force of preferred embodiment according to the present invention, referring again to Fig. 3.In present embodiment, operational amplifier 20 comprises P transistor npn npn 200, P transistor npn npn 201, P transistor npn npn 202, P transistor npn npn 203, P transistor npn npn 204, P transistor npn npn 205, P transistor npn npn 206, N transistor npn npn 207, N transistor npn npn 208, N transistor npn npn 209, N transistor npn npn 210, electric capacity 211, resistance 212 and output stage 25.Wherein P transistor npn npn 201 is right with the differential input of P transistor npn npn 202 formation.P transistor npn npn 203, P transistor npn npn 204, P transistor npn npn 205, P transistor npn npn 206, N transistor npn npn 207, N transistor npn npn 208, N transistor npn npn 209, N transistor npn npn 210 then form folding cascade gain stage (Folded Cascode GainStage).Electric capacity 211 forms resonant earthed system with 212 of resistance.
In present embodiment, drive adjustment circuit 22 and comprise current source cell 23, current source cell 24 and control circuit 30.Wherein current source cell 23 comprises change-over switch 231, P transistor npn npn 232, change-over switch 233, P transistor npn npn 234, change-over switch 235, P transistor npn npn 236.Wherein P transistor npn npn 232, P transistor npn npn 234, P transistor npn npn 236 are respectively coupled between operating voltage VDD and the output terminal.The control end of change-over switch 231, change-over switch 233, change-over switch 235 is accepted the signal of C end D end E end respectively, the gate terminal of controlling P transistor npn npn 232, P transistor npn npn 234, P transistor npn npn 236 respectively be coupled to operating voltage VDD or A end bias voltage one of them.
The truth table of table one control module 30 input ends and output terminal:
Table one is control module 30 inputs and the truth table of exporting, and wherein 0 represents logical zero, is in electronegative potential; 1 represents logical one, is in noble potential.When the C end is logical zero, change-over switch 231 can be switched the gate terminal of P transistor npn npn 232, make the gate terminal of P transistor npn npn 232 be coupled to operating voltage VDD, change-over switch 241 can be switched the gate terminal of N transistor npn npn 242, make the gate terminal of N transistor npn npn 242 be coupled to earth terminal GND, this moment, P transistor npn npn 232 was not worked with N transistor npn npn 242; When the C end is logical one, change-over switch 231 is switched the gate terminal of P transistor npn npn 232, make the gate terminal of P transistor npn npn 232 be coupled to the gate terminal of P transistor npn npn 251, and change-over switch 241 is switched the gate terminal of N transistor npn npns 242, makes the gate terminal of N transistor npn npn 242 be coupled to the gate terminal of N transistor npn npn 252.Can produce this moment electric current from operating voltage VDD sequential flow through the output terminal VOUT of P transistor npn npn 232, output stage 25, N transistor npn npn 242 to earth terminal GND, in order to adjust the drive current of output stage 25.
When the D end is logical zero, change-over switch 233 is switched the gate terminal of P transistor npn npn 234, make the gate terminal of P transistor npn npn 234 be coupled to operating voltage VDD, change-over switch 243 is switched the gate terminal of N transistor npn npn 244, make the gate terminal of N transistor npn npn 244 be coupled to earth terminal GND, this moment, P transistor npn npn 234 was not worked with N transistor npn npn 244; When the D end is logical one, change-over switch 233 is switched the gate terminal of P transistor npn npn 234, make the gate terminal of P transistor npn npn 234 be coupled to the gate terminal of P transistor npn npn 251, and change-over switch 243 is switched the gate terminal of N transistor npn npns 244, makes the gate terminal of N transistor npn npn 244 be coupled to the gate terminal of N transistor npn npn 252.Can produce this moment electric current from operating voltage VDD sequential flow through the output terminal VOUT of P transistor npn npn 234, output stage 25, N transistor npn npn 244 to earth terminal GND, in order to adjust the drive current of output stage 25.
When the E end is logical zero, change-over switch 235 is switched the gate terminal of P transistor npn npn 236, make the gate terminal of P transistor npn npn 236 be coupled to operating voltage VDD, and change-over switch 245 is switched the gate terminal of N transistor npn npn 246, make the gate terminal of N transistor npn npn 246 be coupled to earth terminal GND, this moment, P transistor npn npn 236 was not worked with N transistor npn npn 246; When the E end is logical one, change-over switch 235 is switched the gate terminal of P transistor npn npn 236, make the gate terminal of P transistor npn npn 236 be coupled to the gate terminal of P transistor npn npn 251, and change-over switch 245 is switched the gate terminal of N transistor npn npn 246, make the gate terminal of N transistor npn npn 246 be coupled to the gate terminal of N transistor npn npn 252, can produce this moment electric current from operating voltage VDD sequential flow through the output terminal VOUT of P transistor npn npn 236, output stage 25, N transistor npn npn 246 to earth terminal GND, in order to adjust the drive current of output stage 25.
Referring again to table one, that is to say that when control signal S0 and control signal S1 were logical zero simultaneously, current source cell 23 can not provide the output terminal of electric current to output stage 25 with current source cell 24.When control signal S0 and control signal S1 are respectively " logical zero and logical one ", " logical one and logical zero " with " logical one and logical one ", the electric current that current source cell 23 and current source cell 24 can provide progressive increase respectively to the output terminal VOUT of output stage 25 to strengthen the drive current of output stage 25.Also visual its demand of those skilled in the art, and change embodiment according to the teaching of spirit of the present invention and aforementioned all embodiment.For example, the N transistor npn npn quantity or the element design (as length breadth ratio) of the P transistor npn npn quantity of increase current source cell 23 or element design (as length breadth ratio), current source cell 24, and suitably adjust the circuit coupling access status, just can not repeat them here in order to adjust the drive current of output stage 25.
The operational amplifier 20 of the driving force adjusted of the foregoing description also can be applicable to digiverter.Fig. 4 is according to the synoptic diagram of the represented digiverter of another embodiment of the present invention, please refer to Fig. 4.In the present embodiment, operational amplifier 20 is same as the previously described embodiments with driving adjustment circuit 22, does not repeat them here.Digiverter 45 comprises digital to analog converter 40, operational amplifier 20 and drives adjusts circuit 22.Wherein operational amplifier 20 is coupled between digital to analog converter 40 and the sub-pixel unit 511, as the output buffer of digital to analog converter 40, to increase the driving force of digital to analog converter 40.In the present embodiment, operational amplifier 20 is an operational amplifier, and forms a unity gain circuit with the circuit structure of negative feedback.Drive to adjust circuit 22 and couple mutually, can provide enough and an amount of drive current to sub-pixel unit 511 to adjust operational amplifier 20 with operational amplifier 20.
Also visual its demand of those skilled in the art, and change embodiment according to the description of spirit of the present invention and aforementioned all embodiment.For example, the operational amplifier 20 with the driving force adjusted of the foregoing description is applied to display device.Fig. 5 is the display device synoptic diagram of the amplifier of the represented driving force adjusted of preferred embodiment according to the present invention, please refer to Fig. 5.In the present embodiment, display device has comprised panel 57, a plurality of pixel-driving circuit 501-503.The panel 57 of present embodiment shows that with tft liquid crystal (Thin-Film Transistor Liquid Crystal Display, TFT LCD) panel is an example.Wherein panel 57 has a plurality of sub-pixel unit 511-513.A plurality of pixel-driving circuit 501-503 drive a plurality of sub-pixel unit 511-513 in order to order.Wherein, a plurality of pixel-driving circuit 501-503 all have and drive to adjust circuit 22, in order to the operational amplifier 20 of adjusting a plurality of pixel-driving circuit 501-503 to provide enough and an amount of drive current to a plurality of sub-pixel unit 511-513.It should be noted that since panel 57 after completing, its input equivalent capacity can not change always.Therefore on using, can when adjusting the driving force of a plurality of pixel-driving circuit 501-503, the driving force of a plurality of pixel-driving circuit 501-503 be fixed.So just need not repeatedly adjust the driving force of a plurality of pixel-driving circuit 501-503.
Next just be described further at driving force how to adjust operational amplifier 20 efficiently.Fig. 6 is the display device synoptic diagram that the represented control circuit of preferred embodiment is applied to adjust driving force according to the present invention, please refer to Fig. 6.Panel 57 is identical with the foregoing description Fig. 5.A plurality of pixel-driving circuit 601-603 and the foregoing description Fig. 5 are similar, and difference is in a plurality of pixel-driving circuit 601-603 and does not comprise control circuit 30.Simultaneously circuit 22 output control signals are adjusted in the driving in a plurality of pixel-driving circuit 601-603 by control circuit 60, can once be adjusted the driving force of the operational amplifier 20 in a plurality of pixel-driving circuit 601-603.So the practice just can be avoided all must installing control circuit in each pixel-driving circuit, can significantly save cost.
In sum, the invention provides a kind of driving and adjust circuit structure and application,, increase the driving force of amplifier output stage by the electric current of direct increase amplifier output stage.Output (going into) level that circuit can be applicable to different kenels is adjusted in this driving, on using, when the output stage that is applied in digital to analog converter (at this output-stage circuit that refers to amplifier itself or refer to amplifier inside), can be according to the load state of output stage outside, adjust the driving force of whole digital to analog converter, and more can effectively reduce the unnecessary power consumption of output stage, to improve the degree of stability of whole digital to analog converter.
In sum, though the present invention with preferred embodiment openly as above, so it is not in order to limit the present invention.Those of ordinary skill under any in the technical field under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification.Therefore, protection scope of the present invention is as the criterion with the scope of the claim that proposed.
Claims (11)
1. a system comprises:
One output stage has an output terminal; And
Circuit is adjusted at least one driving, directly provides a drive current to this output terminal, to adjust the driving force of this output stage.
2. the system as claimed in claim 1, this driving are adjusted circuit and are comprised:
One first current source cell; And
One second current source cell, wherein this first current unit and this second current source cell couple this output terminal, and according to the magnitude of current of this first current source and this second current source conduction, adjust the driving force of this output stage.
3. the system as claimed in claim 1, wherein this output stage comprises:
One the first transistor is coupled between an operating voltage and this output terminal, and the control end of this first transistor is coupled to one first bias voltage; And
One transistor seconds is coupled between this output terminal and the earth terminal, and the control end of this transistor seconds is coupled to one second bias voltage;
Wherein, according to this first bias voltage and this second bias voltage, to adjust the electric current of this output terminal.
4. system as claimed in claim 2, wherein this first current source cell of this driving adjustment circuit comprises:
One the 3rd transistor is coupled between an operating voltage and this output terminal;
One first change-over switch is coupled between the 3rd transistorized control end and this first bias voltage;
This second current source cell comprises:
One the 4th transistor is coupled between this output terminal and this earth terminal; And
One second change-over switch is coupled between the 4th transistorized control end and this second bias voltage;
Wherein, this first change-over switch and this second change-over switch be according to one first control signal, with this first control end that is biased into the 3rd crystal of selectivity conducting, and the selectivity conducting this second be biased into the 4th transistorized control end.
5. as claim 3 or 4 described systems, wherein this first transistor and the 3rd transistor are the P transistor npn npn, and this transistor seconds and the 4th transistor are all the N transistor npn npn.
6. the system as claimed in claim 1 wherein also comprises a control circuit, in order to a plurality of control signals to be provided, to control a plurality of this driving adjustment these amount of drive current that circuit was provided.
7. the system as claimed in claim 1, wherein this output stage is an operational amplifier.
8. system as claimed in claim 7 wherein also comprises:
One digital to analog converter receives a digital signal, produces a simulating signal with conversion, and wherein, this operational amplifier receives and drive this simulating signal, and by adjusted this simulating signal of this output terminal output.
9. system as claimed in claim 8, wherein this operational amplifier has a positive input terminal and a negative input end, and wherein this positive input terminal receives this simulating signal, and this output terminal feedbacks adjusted this simulating signal to this negative input end.
10. the system as claimed in claim 1 wherein also comprises:
One panel has a plurality of sub-pixel unit, and wherein this output stage receives a picture signal and exports this picture signal to this panel by this output terminal.
11. system as claimed in claim 10, wherein this output stage is that an operational amplifier and this system also comprise:
One digital to analog converter receives this digital picture signal, produces this digital signal of simulating with conversion, and wherein, this operational amplifier receives this simulating signal, to drive this picture signal simulated and this picture signal of simulating by this output terminal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101486544A CN101192378A (en) | 2006-11-22 | 2006-11-22 | System capable of regulating drive ability of output stage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101486544A CN101192378A (en) | 2006-11-22 | 2006-11-22 | System capable of regulating drive ability of output stage |
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| Publication Number | Publication Date |
|---|---|
| CN101192378A true CN101192378A (en) | 2008-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101486544A Pending CN101192378A (en) | 2006-11-22 | 2006-11-22 | System capable of regulating drive ability of output stage |
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| Country | Link |
|---|---|
| CN (1) | CN101192378A (en) |
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| CN103065597A (en) * | 2012-12-30 | 2013-04-24 | 中航华东光电有限公司 | Signal drive circuit |
| US8497826B2 (en) | 2009-09-08 | 2013-07-30 | Panasonic Corporation | Display panel device and control method thereof |
| CN104218937A (en) * | 2013-06-05 | 2014-12-17 | 华邦电子股份有限公司 | Processing device |
| CN106373534A (en) * | 2015-07-21 | 2017-02-01 | 国民技术股份有限公司 | Segment-code liquid crystal and bias generating circuit and method thereof |
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| CN111586938A (en) * | 2019-02-15 | 2020-08-25 | 台达电子工业股份有限公司 | Driver, control method and light emitting system |
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| US8497826B2 (en) | 2009-09-08 | 2013-07-30 | Panasonic Corporation | Display panel device and control method thereof |
| CN103065597A (en) * | 2012-12-30 | 2013-04-24 | 中航华东光电有限公司 | Signal drive circuit |
| CN104218937B (en) * | 2013-06-05 | 2018-09-14 | 华邦电子股份有限公司 | Processing unit |
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| CN106373534A (en) * | 2015-07-21 | 2017-02-01 | 国民技术股份有限公司 | Segment-code liquid crystal and bias generating circuit and method thereof |
| CN107016968A (en) * | 2016-01-27 | 2017-08-04 | 三菱电机株式会社 | Drive device and liquid crystal display device |
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| TWI581233B (en) * | 2016-03-25 | 2017-05-01 | Chipone Technology (Beijing)Co Ltd | Low power source drive circuit |
| CN107888800B (en) * | 2016-09-29 | 2021-04-09 | 精工爱普生株式会社 | Image reading apparatus and image sensor module |
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| CN107888802B (en) * | 2016-09-29 | 2021-05-11 | 精工爱普生株式会社 | Image reading apparatus |
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| CN108270403B (en) * | 2016-12-30 | 2023-05-02 | 立积电子股份有限公司 | Amplifying circuit |
| CN111586938A (en) * | 2019-02-15 | 2020-08-25 | 台达电子工业股份有限公司 | Driver, control method and light emitting system |
| CN111586938B (en) * | 2019-02-15 | 2022-10-04 | 台达电子工业股份有限公司 | Driver, control method and light emitting system |
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