CN101599250B - Drive voltage generating circuit - Google Patents
Drive voltage generating circuit Download PDFInfo
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- CN101599250B CN101599250B CN2008101104642A CN200810110464A CN101599250B CN 101599250 B CN101599250 B CN 101599250B CN 2008101104642 A CN2008101104642 A CN 2008101104642A CN 200810110464 A CN200810110464 A CN 200810110464A CN 101599250 B CN101599250 B CN 101599250B
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Abstract
The invention relates to a drive voltage generating circuit which comprises a first current generating unit, a comparing unit, a second current generating unit and an adjusting unit, wherein the first current generating unit is coupled between a voltage source and a ground terminal and is used for generating first input current; a first input end of the comparing unit is coupled with the first current generating unit, and a second input end is coupled with an output end of the first current generating unit, and the comparing unit is used for comparing the first input current and second input current so as to generate output voltage; the second current generating unit is coupled between the output end and the second input end of the comparing unit and is used for generating second input current; the adjusting unit is coupled with the second input end, the second current generating unit and the ground terminal of the comparing unit and is used for adjusting the size of the second input current; and the output end of the comparing unit is the output end of the drive voltage generating circuit, and voltage level of output voltage is controlled by the adjusting unit. The invention can provide a plurality of different voltage for liquid crystal displays to select and use so as to ensure that the liquid crystal displays have a plurality of different display contrasts.
Description
Technical field
The present invention is meant a kind of drive voltage generating circuit that is used for display especially relevant for a kind of drive voltage generating circuit.
Background technology
Fig. 1 is a kind of traditional drive voltage generating circuit 100, comprising be coupled to a voltage source (V with the series connection form
DD) and an earth terminal (V
SS) between a plurality of resistance R, a plurality of transmission gate (T
1, T
2, T
3, T
4, T
5, T
6And T
7) and a unity gain buffer amplifier 102.This conventional ADS driving voltage generation circuit 100 also comprises a control circuit (not showing in the drawings), in order to produce a plurality of control signal (C
1, C
2, C
3, C
4, C
5, C
6And C
7) control above-mentioned transmission gate (T respectively
1, T
2, T
3, T
4, T
5, T
6And T
7).By the different above-mentioned transmission gate (T of conducting
1, T
2, T
3, T
4, T
5, T
6And T
7), the user can change the voltage level of node 104, to determine the output voltage V of this drive voltage generating circuit 100
OutValue.This unity gain buffer amplifier 102 is coupled between the output terminal of this node 104 and this drive voltage generating circuit 100, to avoid this output voltage V
OutAlong with the load drift that is driven.
Conventional ADS driving voltage generation circuit 100 shown in Figure 1 utilizes the dividing potential drop of each connection end point of the described resistance R of connecting, and different voltage levels is provided.As shown in Figure 1, this conventional ADS driving voltage generation circuit 100 must adopt at least eight resistance and seven transmission gate (T
1, T
2, T
3, T
4, T
5, T
6And T
7), can provide seven voltage level to select for node 104.In addition, this control module must produce seven control signal (C
1, C
2, C
3, C
4, C
5, C
6And C
7) control described transmission gate (T respectively
1, T
2, T
3, T
4, T
5, T
6And T
7).The present invention will disclose a kind of drive voltage generating circuit.
Summary of the invention
The present invention proposes a kind of drive voltage generating circuit, comprising a voltage source, one first current generating unit, a comparing unit, one second current generating unit and an adjustment unit.First current generating unit is coupled between this voltage source and the earth terminal, in order to produce one first input current.Comparing unit includes a first input end, one second input end and an output terminal, this first input end couples this first current generating unit, this second input end is coupled to this output terminal, comparing unit is in order to relatively this first input current and one second input current, to produce an output voltage.Second current generating unit is coupled between this output terminal and this second input end of this comparing unit, in order to produce one second input current.Adjustment unit is coupled between this second input end, this second current generating unit and this earth terminal of this comparing unit, in order to adjust the size of this second input current.The output terminal of this comparing unit is the output terminal of this drive voltage generating circuit, and the voltage level of this output voltage is by this adjustment unit.
Drive voltage generating circuit of the present invention, this first current generating unit is at least two resistance, this at least two resistance is connected mutually.
Drive voltage generating circuit of the present invention, this second current generating unit is a resistance.
Drive voltage generating circuit of the present invention, this comparing unit are a comparer.
Drive voltage generating circuit of the present invention, this adjustment unit comprises: at least one resistance, an end of this at least one resistance is coupled to earth terminal; At least one switch, an end of this at least one switch is coupled to the other end of this at least one resistance, and the other end of this at least one switch is coupled to this second input end of this comparing unit; And a control circuit, in order to produce at least one control signal, be conducting or not conducting with this at least one switch of control, further control the size of this second input current.
In addition, drive voltage generating circuit of the present invention can be used for driving a LCD, to adjust the demonstration contrast of this LCD.
Drive voltage generating circuit of the present invention can provide multiple different output voltage liquid crystal display to select to use, and makes LCD that multiple different demonstrations contrast can be arranged.
Description of drawings
Fig. 1 is traditional drive voltage generating circuit;
Fig. 2 is the synoptic diagram of drive voltage generating circuit of the present invention;
Fig. 3 is the synoptic diagram of an embodiment of drive voltage generating circuit of the present invention;
Fig. 4 is the synoptic diagram of a preferred embodiment of drive voltage generating circuit of the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphic elaborating.
See also Fig. 2, Fig. 2 is the synoptic diagram of drive voltage generating circuit of the present invention.As shown in Figure 2, drive voltage generating circuit 200 of the present invention includes a voltage source V
DD, one first current generating unit 202, a comparing unit 204, one second current generating unit 206 and an adjustment unit 208.First current generating unit 202 is coupled to voltage source V
DDAn and earth terminal V
SSBetween, in order to produce one first input current I
1Comparing unit 204 includes a first input end N
1, one second input end N
2An and output terminal N
O, first input end N
1Couple first current generating unit, 202, the second input end N
2Then be coupled to output terminal N
O, comparing unit 204 is in order to compare the first input current I
1And one second input current I
2, to produce an output voltage V
OUTSecond current generating unit 206 is coupled to the output terminal N of comparing unit 204
OAnd the second input end N of comparing unit 204
2Between, in order to produce this second input current I
2Adjustment unit 208 is coupled to the second input end N of comparing unit 204
2, second current generating unit 206 and earth terminal V
SS, in order to adjust the second input current I
2Size.Wherein, the output terminal N of this comparing unit 204
OBe the output terminal of this drive voltage generating circuit 200, this output voltage V
OUTVoltage level by 208 controls of this adjustment unit.In an embodiment, drive voltage generating circuit 200 of the present invention can be used for driving a LCD, to adjust the demonstration contrast of this LCD.
See also Fig. 3, Fig. 3 is the synoptic diagram of an embodiment of drive voltage generating circuit of the present invention.As shown in Figures 2 and 3, first current generating unit 202 is at least two resistance R
1, R
2, at least two resistance R
1, R
2Series connection mutually, and be connected in voltage source V
DDAnd earth terminal V
SSBetween, to produce this first electric current I
1204 of comparing units are a comparator C OM, the first input end N of comparing unit 204
1, the second input end N
2Then be respectively positive input terminal (+) and the negative input end (-) of comparator C OM.Second current generating unit 206 is a resistance R
3And adjustment unit 208 comprises at least one resistance R
4, at least one switch S
1An and control circuit (figure does not show).At least one resistance R
4An end be coupled to earth terminal V
SSAt least one switch S
1An end be coupled at least one resistance R
4The other end, at least one switch S
1The other end then be coupled to the second input end N of comparing unit 204
2Control circuit (figure does not show) can produce at least one control signal S
CControl at least one switch S
1Be conducting or not conducting, whether pass through this at least one resistance R with Control current
4, further change the second input current I
2Size.By controlling the second input current I
2Size, utilize the relatively first input current I of comparator C OM again
1And the second input current I
2, produce output voltage V at last
OUT, can reach control output voltage V
OUTPurpose.
See also Fig. 4, Fig. 4 is the synoptic diagram of a preferred embodiment of drive voltage generating circuit of the present invention.As shown in Figure 4, the adjustment unit 308 of this drive voltage generating circuit 300 includes a plurality of resistance R
41～R
4N, corresponding described resistance R
41～R
4NA plurality of switch S
11～S
1NAn and control circuit (figure does not show).Described switch S
11～S
1NThe control signal S that whether exported of conducting by this control circuit (figure does not show)
C1～S
CNControl.The second input current I of this comparator C OM
2Size can be along with described switch S
11～S
1NConducting state and change.This drive voltage generating circuit 300 can be because the second input current I of this comparator C OM
2Difference, and produce different output voltage V
OUT
Drive voltage generating circuit of the present invention can be used for driving a LCD, to adjust the demonstration contrast of this LCD.With Fig. 4 be example, this drive voltage generating circuit 300 can provide the N kind different output voltage V
OUTLiquid crystal display is selected to use, and makes this LCD that the different demonstration contrast of N kind can be arranged.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
100: traditional driving voltage produces circuit
102: the unit gain buffer amplifier
104: node
200,300: driving voltage produces circuit
202: the first current generating units
204: comparing unit
206: the second current generating units
208,308: adjustment unit
N
1, N
2: input end
N
O: output terminal
R, R
1～R
4, R
41～R
4N: resistance
S
1, S
11～S
1N: switch
COM: comparer V
DD: voltage source
V
SS: earth terminal V
OUT: output voltage
C
1～C
7, S
C, S
C1～S
CN: control signal
T
1～T
7: transmission gate.
Claims (5)
1. a drive voltage generating circuit is characterized in that, comprising:
One voltage source;
One first current generating unit is coupled between this voltage source and the earth terminal, in order to produce one first input current; And
One comparing unit, it includes a first input end, one second input end and an output terminal, this first input end couples this first current generating unit, this second input end is coupled to this output terminal, wherein this comparing unit is in order to relatively this first input current and one second input current, to produce an output voltage;
One second current generating unit is coupled between this output terminal and this second input end of this comparing unit, in order to produce this second input current; And
One adjustment unit is coupled to this second input end, this second current generating unit and this earth terminal of this comparing unit, in order to adjust the size of this second input current;
Wherein, the output terminal of this comparing unit is the output terminal of this drive voltage generating circuit, and the voltage level of this output voltage is controlled by this adjustment unit,
This adjustment unit comprises:
At least one resistance, an end of this at least one resistance is coupled to earth terminal;
At least one switch, an end of this at least one switch is coupled to the other end of this at least one resistance, and the other end of this at least one switch is coupled to this second input end of this comparing unit; And
One control circuit in order to produce at least one control signal, is conducting or not conducting with this at least one switch of control, further controls the size of this second input current.
2. drive voltage generating circuit according to claim 1 is characterized in that, this first current generating unit is at least two resistance, and this at least two resistance is connected mutually.
3. drive voltage generating circuit according to claim 1 is characterized in that, this second current generating unit is a resistance.
4. drive voltage generating circuit according to claim 1 is characterized in that, this comparing unit is a comparer.
5. drive voltage generating circuit according to claim 1 is characterized in that, can be used for driving a LCD, to adjust the demonstration contrast of this LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101104642A CN101599250B (en) | 2008-06-03 | 2008-06-03 | Drive voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101104642A CN101599250B (en) | 2008-06-03 | 2008-06-03 | Drive voltage generating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101599250A CN101599250A (en) | 2009-12-09 |
| CN101599250B true CN101599250B (en) | 2011-05-11 |
Family
ID=41420671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101104642A Active CN101599250B (en) | 2008-06-03 | 2008-06-03 | Drive voltage generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101599250B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102376280B (en) * | 2010-08-13 | 2015-08-05 | 鸿富锦精密工业（深圳）有限公司 | Power source regulating circuit and there is the mainboard of this circuit |
-
2008
- 2008-06-03 CN CN2008101104642A patent/CN101599250B/en active Active
Non-Patent Citations (3)
| Title |
|---|
| JP特开2001-343932A 2001.12.14 |
| JP特开2006-154510A 2006.06.15 |
| JP特开平8-029813A 1996.02.02 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101599250A (en) | 2009-12-09 |
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