CN101090593A - High performance current contrast adjustable control circuit - Google Patents
High performance current contrast adjustable control circuit Download PDFInfo
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- CN101090593A CN101090593A CN200610087394.4A CN200610087394A CN101090593A CN 101090593 A CN101090593 A CN 101090593A CN 200610087394 A CN200610087394 A CN 200610087394A CN 101090593 A CN101090593 A CN 101090593A
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- 238000000034 method Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 230000018109 developmental process Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 230000010363 phase shift Effects 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
This invention relates to an adjustable control circuit with high performance current contrast and discloses a method for getting multiple kinds of contrast currents, in which, the basic circuit includes circuits of rough tuning and microtuning current contrast and includes a control logic to select current degrees and a current source circuit to generate stable offset current. This invention includes a wide selection sphere of reference current and displays current grayness accurately.
Description
Technical field
Up to the present, electric current contrast control technology successful Application in OLED chip for driving design.Circuit of the present invention can provide 1,2,3,4 for LCDs by programmable digital logic in design ... 2
N-1The segmentation electric current of grade makes the OLED display color more bright-coloured, true to nature.
Background technology
OLED belongs to the kind of new emergence on display floater, be described as " dreamlike display ".That OLED has is ultra-thin, self-luminous, response speed are fast, good temp characteristic, can realize many outstanding characteristics such as soft demonstrations, and the following replacement of OLED LCD sooner or later is thought by industry manufacturer.
The OLED Display Technique is different with traditional LCD display mode, need not backlight, adopts extremely thin coating of organic material and glass substrate, and when electric current passed through, these organic materials will be luminous.Therefore, the segmentation of drive current design has considerable influence to the final display color effect of liquid crystal display screen.Conventional electric current contrast control circuit is to realize by simple current multiplication.As shown in Figure 1, make M1, M2, M3 respectively by the external logic control circuit ... the Mn conducting, so just, can produce 1,2,3 ... n is doubly to the drive current of bias current Ibias, but in actual applications, this design limitations is that it need take too many silicon area after multiplication factor reached certain size, and the ghost effect meeting causes electric current multiple deviation excessive.In order to reduce integrated area, with M1, M2, M3 ... the design of Mn multiplication factor becomes 2 respectively
0, 2
1, 2
22
N-1,, can produce 2 by logical circuit control
nElectric current doubly, silicon area also significantly reduce than circuit before revising.But unfortunately, development along with Display Technique, require more and more higher to OLED drive current contrast, this must cause the reduction of unitary current value, usually have only about 77nA, concerning scheme 2, like this little bias current how to stablize generation is a difficult point, and this circuit still is not suitable in the high-contrast circuit.
Summary of the invention
The purpose of this invention is to provide a kind of circuit, can select moderate contrast work reference current, it is too small to have overcome bias current, exports unsettled shortcoming, can better increase contrast progression simultaneously.
To achieve these goals, the technical solution used in the present invention is: a kind of high-performance current contrast adjustable control circuit, it comprises an electric current mlultiplying circuit, current subtraction circuit, a control logic and selects current class and a current source circuit to produce stable bias current.The darker one deck of circuit includes horizontal phase-shift circuit to produce different voltage control signals, and control logic is in order to conducting and cut-off current transmission.
This circuit has disclosed a method that obtains multiple contrast electric current.This method has comprised by above-mentioned electric current contrast adjustable control circuit carries out the step of simple modification and produces the step that a control logic is regulated electric current.
Description of drawings
Below in conjunction with drawings and the specific embodiments the present invention is described in further detail.
Fig. 1 is simple current multiplication circuit;
Fig. 2 is a kind of high-performance current contrast adjustable control circuit functional block diagram;
Fig. 3 is a biasing circuit;
Fig. 4 is a coarse adjustment electric current contrast module;
Fig. 5 is a fine-adjusting current contrast module;
Fig. 6 is the electric current output module;
Fig. 7 is 512 grades of contrast control circuit of coarse adjustment electric current;
Fig. 8 is 512 grades of contrast control circuit of fine-adjusting current.
Embodiment
After reading the detailed description of following each side, also comprising the description of the drawings, these and other advantages of the present invention will manifest undoubtedly.Below in conjunction with accompanying drawing the present invention is done a detailed description.
Fig. 2 is a kind of high-performance current contrast adjustable control circuit functional block diagram, and it is made up of a control logic and several separation simulation module with difference in functionality.Can divide each different module according to their standalone feature.
Fig. 3 is a biasing circuit, and it provides bias current for the contrast circuit, and in order to keep stable current value, circuit can be taked the outer meeting resistance pattern.This circuit constitutes current mirroring circuit by M1, M2, and the external selection resistance of Ibias port produces optimum amounts of current, and M3, M4 form second mirror image circuit together, for coarse adjustment electric current contrast module provides current value.M1, M2 are the pmos pipe, and breadth length ratio equates; M3, M4 are the nmos pipe, and breadth length ratio equates.Control signal vd and
Be used to close and open biasing circuit.When vd was high level, switch sw1 closed, the sw2 conducting, and this moment, electric current I source equaled Ibias.When vd is low level, switch sw1 conducting, sw2 closes, and M1, M2 quit work.Electric current I source and Ibias are zero.
Fig. 4 is a coarse adjustment electric current contrast module, is the special case that the present invention realizes 256 grades of contrasts.It mainly comprises one with reference to input current unit and four current output unit.The input current unit is made of PMOS pipe M0, and the M0 source electrode meets power supply VCC, and its grid links to each other with its drain electrode, and its grid links to each other with four current output unit grids respectively.The M0 drain electrode is connected with the drain electrode of Fig. 3 NMOS pipe M4, and bias current is provided by Fig. 3 M4 pipe.
Four current output unit, first current output unit is made of M1 and switch sw1.M1 is the PMOS pipe, and its breadth length ratio is 2 times of M0, and the grid of M1 is connected with the grid of M0.Electric current output switch is by signal w1 control, and when w1 was high level, switch sw1 closed, and this moment, M1 ended; When w1 is low level, switch sw1 conducting, the Ibias that I1 equals 2 times.
Second current output unit is made up of M2 and switch sw2.M2 is the PMOS pipe, and its breadth length ratio is 1 times of M0, and the M2 grid is connected with the M0 grid.Switch sw2 is by signal w2 control, and when w2 is a high level, switch sw2 closes, and I2 is zero; When w2 is low level, switch sw2 conducting, the Ibias that I2 equals 1 times.
The 3rd current output unit circuit is made up of M3 and switch sw3.M3 is the PMOS pipe, and its breadth length ratio is 1/2 times of M0, and the M3 grid is connected with the M0 grid.Switch sw3 is by signal w3 control, and when w3 is a high level, switch sw2 closes, and M3 ends; When w3 is low level, switch sw3 conducting, the Ibias that I3 equals 1/2 times.
The drain electrode of metal-oxide-semiconductor M1, M2, M3 links together, coarse adjustment electric current contrast circuit output current value is I1, I2, I3 three's sum, therefore, by the control of logical signal to switch sw1, sw2, sw3, can realize that output current Iout is 0～7/2 times of reference current Ibias, because minimum change is 1/2 times Ibias, the electric current variable range equals 2
3Level.
The 4th current output unit is made of M4, and M4 is the PMOS pipe, and its breadth length ratio is 1/2 times of M0, and the M4 grid is connected with the M0 grid.The I4 current value equals 1/2 Ibias.The drain electrode of M4 is connected with the public source of fine-adjusting current contrast circuit.
Fig. 5 is a fine-adjusting current contrast circuit, is the special case that the present invention realizes 256 grades of contrasts, is made up of simple bleeder circuit and six groups of current output unit.Simple bleeder circuit is composed in series by resistance p1 and resistance p2, and output offset voltage VP makes M1, M2, M3, M4, M5, M6 be in conducting state.Source current Isource outwards exports i1 through six groups of current output unit respectively: the current value size of i2: i3: i4: i5: i6 is 16: 8: 4: 2: 1: 1.Output current Iout is the electric current sum of i1, i2, i3, i4, i5, i6, therefore, by the control of logical signal to switch sw1～sw10, can realize output current Iout 0～31 times for minimum shunting i6, promptly equals 2
5Level.Output current Iout and first group of current output unit are made up of M1, sw1, sw2, and the breadth length ratio of M1 equals 16 times of M6, and its grid is connected with the M6 grid, and source electrode connects the Isource end.Switch sw1, sw2 are respectively by signal psi 1 and
Control.When φ 1 is a high level
During for low level, sw1 closes the sw2 conducting, and current i 1 flows to Iout by switch sw2; Otherwise electric current flows to ground wire by switch sw1.
Second group of current output unit is made up of M2, sw3, sw4, and the breadth length ratio of M2 equals 8 times of M6, and its grid links to each other with the M6 grid, and source electrode connects the Isource end.Switch sw3, sw4 are respectively by signal psi
2With
Control, φ
2With
Current potential is opposite.Work as φ
2During for high level, sw3 closes the sw4 conducting, and current i 2 flows to Iout by switch sw4; Otherwise electric current flows to ground wire by switch sw3.
The 3rd group of current output unit is made up of M3, sw5, sw6, and the breadth length ratio of M3 equals 4 times of M6, and its grid links to each other with the M6 grid, and source electrode connects the Isource end.Switch sw5, sw6 are respectively by signal psi
3With
Control, φ
3With
Current potential is opposite.Work as φ
3During for high level, sw5 closes the sw6 conducting, and current i 3 flows to Iout by switch sw6; Otherwise electric current flows to ground wire by switch sw5.
The 4th group of current output unit is made up of M4, sw7, sw8, and the breadth length ratio of M4 equals 2 times of M6, and its grid links to each other with the M6 grid, and source electrode connects the Isource end.Switch sw7, sw8 are respectively by signal psi
4With
Control, φ
4With
Current potential is opposite.Work as φ
4During for high level, sw7 closes the sw8 conducting, and current i 4 flows to Iout by switch sw8; Otherwise electric current flows to ground wire by switch sw7.
The 5th group of current output unit is made up of M5, sw9, sw10, and the breadth length ratio of M5 equals 1 times of M6, and its grid links to each other with the M6 grid, and source electrode connects the Isource end.Switch sw9, sw10 are respectively by signal psi
5With
Control, φ
5With
Current potential is opposite.Work as φ
5During for high level, sw9 closes the sw10 conducting, and current i 5 flows to Iout by switch sw10; Otherwise electric current flows to ground wire by switch sw9.
The 6th group of current output unit is made of M6, and the M6 grid connects the VP current potential, and its source electrode connects Isource end, grounded drain line.During circuit working, M6 current i 6 often is conducting to ground wire, and size equals 1/32 Isource.
By Fig. 4 and Fig. 5 circuit analysis, coarse adjustment electric current contrast circuit can produce 2
3Gray-scale current, fine-adjusting current contrast circuit can produce 2
5Gray-scale current.Because the output current of coarse adjustment electric current contrast circuit and fine-adjusting current contrast circuit superposes at last, therefore, circuit has realized 2
8Level is 256 grades contrast control just.
For 512 grades of contrast special cases, on 256 grades of bases, have two kinds of methods to realize:
1, the trimming circuit structure remains unchanged, and revises coarse adjustment electric current contrast circuit, and by increasing an output unit, the breadth length ratio requirement of Mad pipe is 2 times of M1, makes coarse adjustment circuital current contrast progression become 2
4, as shown in Figure 7; The trimming circuit structure remains unchanged, and so just can realize 2
9Level is 512 grades contrast control just.
2, the coarse adjustment circuit structure is constant, and fine-adjusting current contrast circuit increases by one group of current output unit, and the breadth length ratio requirement of Mad pipe is 2 times of M1, makes trimming circuit electric current contrast progression become 2
6, as shown in Figure 8.
For high-contrast circuit more, make amendment and to realize according to above method.
Fig. 6 is the electric current output module, and main effect is the characteristic according to the 0LED liquid crystal display screen, regulates the output current minimum change, makes contrast change difference and can obviously show in the liquid crystal display screen demonstration.Input current Isource is coarse adjustment contrast circuit and fine setting contrast circuit sum, and the breadth length ratio of M1 is 2 times of M2.
Claims (6)
1, a kind of high-performance current contrast adjustable control circuit is characterized in that: basic circuit is coarse adjustment electric current contrast circuit and fine-adjusting current contrast circuit, and structure can be torn open flexibly and be joined, and can realize the electric current output of any contrast on the principle; In addition, this circuit also comprises a biasing circuit and a programmable logic controller (PLC), the input of Control current, output, thus obtain different OLED drive currents.
2, a kind of high-performance current contrast adjustable control circuit as claimed in claim 1, it is characterized in that: include a coarse adjustment electric current contrast circuit, with Ibias is reference current, it provides 1～doubly to the input current of reference current, and provides current source for fine-adjusting current contrast circuit for next stage; Coarse adjustment electric current contrast circuit structure comprises five PMOS pipes M0, M1, M2, M3, M4, the source electrode of these five PMOS meets power supply VCC jointly, the gate interconnect of five PMOS, wherein the M0 grid and the drain electrode short circuit, M0, M1, M2, M3, M4 constitute four tunnel current-mirror structure; M1, M2, M3, M4 were to the breadth length ratio of M0 2: 1: 1/2 respectively: 1/2, three switching tube sw1, sw2, sw3, and it is respectively by control signal w1, w2, w3 control, the conducting of the current output unit that their decision M1, M2, M3 form and ending; The current potential of w1, w2, w3 can independently be controlled, and different signal combination finally can produce a grade contrast electric current; Current source is provided for fine-adjusting current contrast circuit by the four tunnel current output unit that M4 constitutes.
3, a kind of high-performance current contrast adjustable control circuit as claimed in claim 1, it is characterized in that: include a fine-adjusting current contrast circuit, with minimum current value i6 is reference current, its for next stage provide 1～doubly to the input current of reference current; Coarse adjustment electric current contrast circuit structure comprises the bleeder circuit that power supply VCC, resistance p1 and resistance p2 form, and this circuit current-dividing network provides cut-in voltage VP; Form current-dividing network by PMOS pipe M1, M2, M3, M4, M5, M6, M1, M2, M3, M4, M5 are respectively the breadth length ratio of M6: 16: 8: 4: 2: 1; The source electrode of M1～M6 is with connecing current input terminal, and its grid is with meeting cut-in voltage VP; There is following relation: Isource=i1+i2+i3+i4+i5+i6 in the conducting electric current of circuit, i1=16*i6 wherein, i2=8*i6, i3=4*i6, i4=2*i6, i5=1*i6; 10 switching tube sw1～sw10, its respectively by control signal,,,,,,,,,,,,,,,,,,, control, with current potential opposite, the conducting of the current output unit that the decision of above control signal M1, M2, M3, M5, M6, M7, M8, M9, M10 form and ending; Control signal can independently be controlled, and different signal combination finally can produce a grade contrast electric current.
4, a kind of high-performance current contrast adjustable control circuit as claimed in claim 1 is characterized in that: by changing the structure of basic circuit (coarse adjustment electric current contrast circuit and fine-adjusting current contrast circuit), can realize that contrast is adjustable; For the current control circuit special case of 256 grades of gray scales of design, coarse adjustment electric current contrast control circuit realizes the gray scale adjusting, and the fine-adjusting current contrast control circuit realizes the gray scale adjusting; For 128 grades of contrast circuit of design, on 256 grades of contrast architecture basics of special case, coarse adjustment electric current contrast control circuit basic circuit structure is revised, and by with the deletion of first current output unit, coarse adjustment circuital current contrast progression is become; Perhaps fine-adjusting current contrast control circuit basic circuit structure is revised, and by with the deletion of first current output unit, coarse adjustment circuital current contrast progression is become.
5, a kind of high-performance current contrast adjustable control circuit as claimed in claim 1, it is characterized in that: include a biasing circuit, PMOS pipe M1, M2 source electrode meet power supply VCC, its grid end short circuit, the M1 drain and gate is connected, and the breadth length ratio of M1 and M2 is 1: 1; NMOS pipe M3, M4 source ground line, its grid end short circuit, the M3 drain and gate is connected, and the breadth length ratio of M3 and M4 is 1: 1; Switching tube sw1, sw2 are used to control the conducting of biasing circuit and end, and its neutralization has opposite current potential.
6, a kind of high-performance current contrast adjustable control circuit as claimed in claim 1, it is characterized in that: Chang Gui electric current contrast control circuit relatively, the reference current scope of design of sort circuit is very well-to-do, can select moderate contrast current value as the reference electric current, avoid too little, the unsettled situation of conventional current contrast control circuit reference current.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100873944A CN100502607C (en) | 2006-06-13 | 2006-06-13 | High performance current contrast adjustable control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100873944A CN100502607C (en) | 2006-06-13 | 2006-06-13 | High performance current contrast adjustable control circuit |
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| CN101090593A true CN101090593A (en) | 2007-12-19 |
| CN100502607C CN100502607C (en) | 2009-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673516B (en) * | 2008-09-09 | 2012-06-27 | 上海申瑞电力科技股份有限公司 | Liquid crystal screen contrast adjustment circuit for monitoring equipment |
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2006
- 2006-06-13 CN CNB2006100873944A patent/CN100502607C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673516B (en) * | 2008-09-09 | 2012-06-27 | 上海申瑞电力科技股份有限公司 | Liquid crystal screen contrast adjustment circuit for monitoring equipment |
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| CN100502607C (en) | 2009-06-17 |
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Denomination of invention: High performance current contrast adjustable control circuit Effective date of registration: 20141017 Granted publication date: 20090617 Pledgee: Bank of Shanghai, Limited by Share Ltd, Shenzhen branch Pledgor: Teralane Semiconductor (Shenzhen) Co., Ltd. Registration number: 2014990000861 |
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Owner name: SHENZHEN KEMING INDUSTRIAL CO., LTD. Free format text: FORMER OWNER: TIANLI SEMICONDUCTOR (SHENZHEN) CO., LTD. Effective date: 20150716 |
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Effective date of registration: 20150716 Address after: 518000 main building of Xin Xing square, Shennan East Road, Shenzhen, Guangdong, Luohu District 59-1 Patentee after: Shenzhen Keming Industrial Co. Ltd. Address before: Nanshan District River Road Shenzhen city Guangdong province 518067 No. 6 jialitai Building 8 floor E block Patentee before: Teralane Semiconductor (Shenzhen) Co., Ltd. |
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