CN104851396B - Buffer circuit, panel module and display drive method - Google Patents
Buffer circuit, panel module and display drive method Download PDFInfo
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- CN104851396B CN104851396B CN201410050201.2A CN201410050201A CN104851396B CN 104851396 B CN104851396 B CN 104851396B CN 201410050201 A CN201410050201 A CN 201410050201A CN 104851396 B CN104851396 B CN 104851396B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Crystallography & Structural Chemistry (AREA)
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- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A kind of buffer circuit, panel module and display drive method.Buffer circuit includes positive polarity buffer and negative polarity buffer.The supply voltage of positive polarity buffer inputs first and second source voltage so that positive polarity buffer output cathode reference voltage to positive polarity resistance string.Second source voltage is less than the first supply voltage.Negative polarity buffer inputs second source voltage and the 3rd supply voltage so that negative polarity buffer output negative pole reference voltage to negative polarity resistance string.3rd supply voltage is less than second source voltage.
Description
Technical field
The present invention relates to a kind of electronic installation, and more particularly to a kind of buffer circuit, panel module and display drive method.
Background technology
With the universalness of display product, the Related product of liquid crystal display is seen everywhere arround life now.To
Enable liquid crystal display correctly display picture, then must be by digital analog converter (Digital to Analog
Converter, DAC) data signal of image data is converted to it is enough the analog signal for driving liquid crystal molecule.In data signal
During turning analog signal, digital analog converter must use the gamma reference voltage of several different position ranks.
Fig. 1 is refer to, Fig. 1 is schematically shown as positive polarity resistance string, negative polarity resistance string, positive polarity buffer and negative polarity buffering
The schematic diagram of device.Because liquid crystal molecule has the consideration of the reverse of polarity, thus general driving chip have positive polarity resistance string 32 and
Negative polarity resistance string 33 represents the voltage of its positive-negative polarity respectively.Positive polarity resistance string 32 and negative polarity resistance string 33 are also known as gal
Horse resistance.Voltage in positive polarity resistance string 32 is provided by positive polarity buffer amplifier 35, and the electricity in negative polarity resistance string 33
Pressure is provided by negative polarity buffer amplifier 36.
Diverse location of the different positive polarity buffer amplifiers 35 in positive polarity resistance string 32 defines its dividing point, and not
Diverse location of the same negative polarity buffer amplifier 36 in negative polarity resistance string 33 defines its dividing point.Each dividing point enters back into
The output voltage values and polarity of driving chip are determined in digital analog converter by input signal.Because resistance value and its electric current disappear
Consumption is inversely proportional, and general driving chip can exhaust hundreds of micromicroamperes to number milli in positive polarity resistance string 32 and negative polarity resistance string 33
The grade of ampere, occupies the ratio of most to whole driving chip current drain face.
The content of the invention
The present invention relates to a kind of buffer circuit, panel module and display drive method.
A kind of according to the present invention it is proposed that buffer circuit.Buffer circuit includes positive polarity buffer and negative polarity buffer.Just
The supply voltage of polarity buffer inputs first and second source voltage so that positive polarity buffer output cathode reference voltage is extremely
Positive polarity resistance string.Second source voltage is less than the first supply voltage.Negative polarity buffer inputs second source voltage and the 3rd
Supply voltage so that negative polarity buffer output negative pole reference voltage to negative polarity resistance string.3rd supply voltage is less than the
Two supply voltages.
A kind of according to the present invention it is proposed that panel module.Panel module includes panel, positive polarity resistance string, negative polarity resistance
String, buffer circuit and drive circuit.Buffer circuit includes positive polarity buffer and negative polarity buffer.Positive polarity buffer inputs
First supply voltage and second source voltage so that positive polarity buffer output cathode reference voltage to positive polarity resistance string.
Second source voltage is less than the first supply voltage.Negative polarity buffer inputs second source voltage and the 3rd supply voltage so that
Negative polarity buffer output negative pole reference voltage is to negative polarity resistance string.3rd supply voltage is less than second source voltage.Drive
Dynamic circuit is according to the first reference voltage and the second reference voltage driving panel.
A kind of according to the present invention it is proposed that display drive method.Display drive method includes：Supply needed for positive polarity buffer
The first supply voltage and second source voltage so that positive polarity buffer output cathode reference voltage, second source voltage
Less than the first supply voltage；Supply the second source voltage and the 3rd supply voltage needed for negative polarity buffer so that negative polarity
Buffer output negative pole reference voltage, the 3rd supply voltage are less than second source voltage；And according to positive polarity reference voltage
And negative polarity reference voltage driving panel.
More preferably understand to have to the above-mentioned and other aspect of the present invention, preferred embodiment cited below particularly, and coordinate attached
Figure, is described in detail below：
Brief description of the drawings
Fig. 1 is schematically shown as the signal of positive polarity resistance string, negative polarity resistance string, positive polarity buffer and negative polarity buffer
Figure.
Fig. 2 is schematically shown as a kind of schematic diagram of panel module according to first embodiment.
Fig. 3 is schematically shown as a kind of schematic diagram of buffer circuit according to first embodiment.
Fig. 4 is schematically shown as positive polarity resistance string and couples three positive polarity buffers and negative polarity resistance string three negative polarity of coupling
The schematic diagram of buffer.
Fig. 5 is schematically shown as a kind of schematic diagram of buffer circuit according to second embodiment.
Fig. 6 is schematically shown as a kind of schematic diagram of panel module according to 3rd embodiment.
Fig. 7 is schematically shown as coupling n positive polarity buffer and m negative pole according to m positive polarity resistance string of fourth embodiment
Property resistance string couple n negative polarity buffer schematic diagram.
Fig. 8 is schematically shown as a kind of signal that supply voltage VMID is provided by supply voltage output circuit according to the 5th embodiment
Figure.
Fig. 9 is schematically shown as a kind of schematic diagram of panel module according to sixth embodiment.
Figure 10 is schematically shown as a kind of schematic diagram of panel module according to the 7th embodiment.
Figure 11 is schematically shown as a kind of flow chart of display drive method according to the 8th embodiment.
【Symbol description】
1、3：Panel module
8：Source driving chip
81：Resistance string
11：Panel
12、12a、32：Positive polarity resistance string
13、13a、33：Negative polarity resistance string
14a、14b、14c：Buffer circuit
15th, 15a~15n, 35：Positive polarity buffer
16th, 16a~16n, 36：Negative polarity buffer
16：Negative polarity buffer
17：Drive circuit
141：Supply voltage output circuit
151、152、161、162：Power end
153、163：Output end
154：Positive input level
155：Positive output level
156、166：Selecting switch
164：Negative input level
165：Negative output level
201~203：Step
1411：Middle compression buffer
1541、1542、1641、1642：Current source
1543、1544、1545、1546、1643、1644、1645、1646：Input transistors
CM：Electric capacity
GOP：Buffer
VDD、VMID、VGND：Supply voltage
VIP, VIP1~VIPn, VIN, VIN1~VINn：Input voltage
VPG：Positive polarity reference voltage
VNG：Negative polarity reference voltage
P9A、N9A、P9B、N9B、P9C、N9C、P9P、N9P、P9N、N9N：Output transistor
I1、I2、I3、I4、IA、IB、IC、ID、IE、IF、IAP~INP、IAN~INN、I1P~Inp、I1N~InN：Electric current
R1、R2、R1P~RNP、R1N~RNN：Divider resistance
Embodiment
First embodiment
A kind of schematic diagram of panel module according to first embodiment, Fig. 3 are schematically shown as referring to Fig. 2 and Fig. 3, Fig. 2
It is schematically shown as a kind of schematic diagram of buffer circuit according to first embodiment.Panel module 1 includes panel 11, positive polarity resistance string
12nd, negative polarity resistance string 13, buffer circuit 14a and drive circuit 17.Positive polarity resistance string 12 and negative polarity resistance string 13 are for example
For gamma resistance.Buffer circuit 14a includes positive polarity buffer 15 and negative polarity buffer 16.Positive polarity buffer 15 and negative pole
Property buffer 16 be, for example, gamma operational amplifier (Gamma OP).Drive circuit 17 is, for example, source driving chip.
Positive polarity buffer 15 receives supply voltage VDD and supply voltage VMID so that positive polarity buffer 15 is according to defeated
Enter voltage VIP output cathode reference voltage VPG to positive polarity resistance string 12.Supply voltage VMID is less than supply voltage VDD.It is negative
Polarity buffer 16 receives supply voltage VMID and supply voltage VGND so that negative polarity buffer 16 is according to input voltage VIN
Output negative pole reference voltage VNG is to negative polarity resistance string 13.Supply voltage VGND is less than supply voltage VMID, supply voltage
VGND is substantially equal to ground voltage.That is, supply voltage VMID is between supply voltage VDD and supply voltage VGND.Drive
Dynamic circuit 17 is according to positive polarity reference voltage VPG and negative polarity reference voltage VNG driving panels 11.
Furthermore, it is understood that positive polarity buffer 15 includes power end 151, power end 152, output end 153, positive input level
154 and positive output level 155.Power end 151 receives supply voltage VDD, and power end 152 receives supply voltage VMID.Output end
153 are coupled to positive polarity resistance string 12.Positive input level 154 couples positive output level 155.Power end 151 and power end 152 are coupled to
Positive output level 155, to supply the supply voltage VDD and supply voltage VMID needed for positive polarity buffer 15.Negative polarity buffer
16 include power end 161, power end 162, output end 163, negative input level 164 and negative output level 165.Power end 161 receives electricity
Source voltage VMID, and power end 162 receives supply voltage VGND.Output end 163 is coupled to negative polarity resistance string 13.Negative input level
164 coupling negative output levels 165.Power end 161 and power end 162 are coupled to negative output level 165, to supply negative polarity buffer 16
Required supply voltage VMID and supply voltage VGND.
Positive output level 155 includes output transistor P9P and output transistor N9P, and output transistor N9P coupling outputs are brilliant
Body pipe P9P.Power end 151 is coupled to output transistor P9P source electrode to supply supply voltage VDD to positive output level 155.Power supply
End 152 is coupled to output transistor N9P source electrode to supply supply voltage VMID to positive output level 155.Negative output level 165 includes
Output transistor P9N and output transistor N9N, and output transistor N9N coupling output transistors P9N.Power end 161 couples defeated
Go out transistor P9N source electrode to supply supply voltage VMID to negative output level 165.Power end 162 couples output transistor N9N's
Source electrode is to supply supply voltage VGND to negative output level 165.When positive output level 155 is identical with the size of current of negative output level 165,
Then there is the effect that electric current re-uses.
Fig. 4 is refer to, Fig. 4 is schematically shown as positive polarity resistance string and couples three positive polarity buffers and the coupling of negative polarity resistance string
The schematic diagram of three negative polarity buffers.Positive polarity buffer 15a, positive polarity buffer 15b and positive polarity buffer 15c difference
According to input voltage VIP1, input voltage VIP2 and input voltage VIP3 output cathode reference voltages VPG1, positive polarity reference
Voltage VPG2 and positive polarity reference voltage VPG3 is to positive polarity resistance string 12.Negative polarity buffer 16a, negative polarity buffer 16b
And negative polarity buffer 16c joins according to input voltage VIN 1, input voltage VIN 2 and the output negative pole of input voltage VIN 3 respectively
Voltage VNG1, negative polarity reference voltage VNG2 and negative polarity reference voltage VNG3 are examined to negative polarity resistance string 13.
Positive polarity buffer 15a includes output transistor P9A and output transistor N9A.Positive polarity buffer 15b includes defeated
Go out transistor P9B and output transistor N9B.Positive polarity buffer 15c includes output transistor P9C and output transistor N9C.It is negative
Polarity buffer 16a includes output transistor P9D and output transistor N9D.Negative polarity buffer 16b includes output transistor
P9E and output transistor N9E.Negative polarity buffer 16c includes output transistor P9F and output transistor N9F.
Positive polarity resistance string 12 includes divider resistance R1And divider resistance R2, and divider resistance R1Couple divider resistance R2.It is negative
Polarity resistance string 13 includes divider resistance R1And divider resistance R2, and divider resistance R1Couple divider resistance R2.Positive polarity buffer
15a, positive polarity buffer 15b, positive polarity buffer 15c, negative polarity buffer 16a, negative polarity buffer 16b and negative polarity are delayed
Rush device 16c difference output currents IA, electric current IB, electric current IC, electric current ID, electric current IEAnd electric current IF.Electric current I1And electric current I2Flow respectively
Divider resistance R through positive polarity resistance string 121And divider resistance R2.Electric current I3And electric current I4Flow separately through negative polarity resistance string 13
Divider resistance R2And divider resistance R1。
Positive polarity resistance string 12 can take out electric current I all the way from supply voltage VDDA, electric current IAFlowed through via output transistor P9A
Positive polarity resistance string 12 flow to supply voltage VMID by output transistor N9C again.Negative polarity resistance string 13 can be from supply voltage
VMID takes out electric current I all the wayD, electric current IDNegative polarity resistance string 13 is flowed through via output transistor P9D to be flowed by output transistor N9F again
To supply voltage VGND.If positive polarity resistance string 12 is identical with the resistance of negative polarity resistance string 13, and positive polarity resistance string 12 with
The head and the tail both end voltage difference of negative polarity resistance string 13 is identical, then the voltage of positive polarity resistance string 12 and electric current and negative polarity resistance string
13 is symmetrical.Compared to positive polarity buffer 15a, positive polarity buffer 15b, positive polarity buffer 15c, negative polarity buffer
16a, negative polarity buffer 16b and negative polarity buffer 16c all operate in supply voltage VDD and supply voltage VGND framework
Under, the present embodiment can save the electric current of about half.If positive polarity resistance string 12 and the asymmetry of negative polarity resistance string 13 or bias
When point is inconsistent, then have electric current all the way makes up the gap from supply voltage VMID, or unnecessary electric current is from supply voltage VMID
Outflow.Therefore no matter whether positive polarity resistance string 12 is identical with the resistance of negative polarity resistance string 13, no matter also positive polarity resistance string
Whether 12 is identical with the head and the tail both end voltage difference of negative polarity resistance string 13, and above-described embodiment can all reach the mesh of low-power consumption
's.
Second embodiment
A kind of schematic diagram of buffer circuit according to second embodiment is schematically shown as referring to Fig. 2 and Fig. 5, Fig. 5.Second
Embodiment in place of first embodiment main difference with being that power end 151 and power end 152 are coupled to the just defeated of buffer circuit 14b
Enter level 154, to supply the supply voltage VDD and supply voltage VMID needed for positive polarity buffer 15.Power end 161 and power end
162 are coupled to buffer circuit 14b negative input level 164, to supply supply voltage VMID and the electricity needed for negative polarity buffer 16
Source voltage VGND.
Positive input level 154 includes current source 1541, current source 1542, input transistors 1543, input transistors 1544, defeated
Enter transistor 1545 and input transistors 1546.Input transistors 1543 and input transistors 1544 are coupled to current source 1541,
And input transistors 1545 and input transistors 1546 are coupled to current source 1542.Power end 152 couple current source 1541 for
Supply voltage VMID is answered to positive input level 154.Power end 151 is coupled to current source 1542 to supply supply voltage VDD to just defeated
Enter level 154.
Negative input level 164 includes current source 1641, current source 1642, input transistors 1643, input transistors 1644, defeated
Enter transistor 1645 and input transistors 1646.Input transistors 1643 and input transistors 1644 are coupled to current source 1641,
And input transistors 1645 and input transistors 1646 are coupled to current source 1642.Power end 162 couple current source 1641 for
Supply voltage VGND is answered to negative input level 164.Power end 161 couples current source 1642 to supply supply voltage VMID to negative input
Level 164.
3rd embodiment
Fig. 6 is refer to, Fig. 6 is schematically shown as a kind of schematic diagram of panel module according to 3rd embodiment.3rd embodiment with
It is in place of first embodiment main difference：The buffer circuit 14c of panel module 3 also includes selecting switch 156 and selecting switch
166.Selecting switch 156 exports supply voltage VMID or supply voltage VGND to positive polarity buffer 15, and selecting switch 166
Supply voltage VMID or supply voltage VDD are exported to negative polarity buffer 16.As the output supply voltage VMID of selecting switch 156
To positive polarity buffer 15, and the output supply voltage VMID of selecting switch 166 then can reach low current to negative polarity buffer 16
The purpose of consumption.
Fourth embodiment
Fig. 7 is refer to, Fig. 7 is schematically shown as coupling n positive polarity buffer according to m positive polarity resistance string of fourth embodiment
And m negative polarity resistance string couples the schematic diagram of n negative polarity buffer.Positive polarity buffer 15a to positive polarity buffer 15n
Respectively according to input voltage VIP1 to input voltage VIPn output cathode reference voltage VPG1 to positive polarity reference voltage VPGn
To m positive polarity resistance string 12a.N and m is more than 1 positive integer.Positive polarity resistance string 12a includes divider resistance R1PTo partial pressure electricity
Hinder RNP, and m positive polarity resistance string 12a is mutually in parallel.Negative polarity buffer 16a to negative polarity buffer 16n is respectively according to defeated
Enter voltage VIN1 to input voltage VIN n output negative pole reference voltage VNG1 to negative polarity reference voltage VNGn to m negative polarity
Resistance string 13a.Negative polarity resistance string 13a includes divider resistance R1NTo divider resistance RNN, and m negative polarity resistance string 13a is mutual
It is in parallel.Positive polarity buffer 15a to positive polarity buffer 15n and negative polarity buffer 16a to negative polarity buffer 16n difference is defeated
Go out electric current IAPTo INPAnd electric current IANTo electric current INN.Electric current I1PTo InPFlow point piezoresistance R respectively1PTo RNP.Electric current I1NTo InNRespectively
Flow through divider resistance R1NTo RNN。
5th embodiment
It refer to Fig. 7 and Fig. 8, Fig. 8 be schematically shown as providing electricity by supply voltage output circuit according to a kind of of the 5th embodiment
Source voltage VMID schematic diagram.5th embodiment and the buffer circuit for being the 5th embodiment in place of fourth embodiment main difference
Also include supply voltage output circuit 141.Supply voltage output circuit 141 includes middle compression buffer 1411 and electric capacity CM.So its
Implementation is not limited to this, and in other embodiments, supply voltage output circuit 141 also can be by linear voltage regulator (Low
Drop Out, LDO) or buck converter (Back Converter) realize.
Sixth embodiment
It refer to Fig. 2 and Fig. 9, Fig. 9 be schematically shown as a kind of schematic diagram of panel module according to sixth embodiment.Aforementioned positive electrode
Property resistance string and negative polarity resistance string can be built into source driving chip 8 such as the resistance string 81 that Fig. 9 is illustrated, and aforementioned positive electrode delays
Source driving chip 8 can be built into such as the buffer GOP that Fig. 9 is illustrated by rushing device and negative polarity buffer.
7th embodiment
It refer to Fig. 2 and Figure 10, Figure 10 be schematically shown as a kind of schematic diagram of panel module according to the 7th embodiment.It is foregoing just
Polarity resistance string and negative polarity resistance string can be built into source driving chip 8 such as the resistance string 81 that Fig. 9 is illustrated, and aforementioned positive electrode
Buffer and negative polarity buffer then can not be built into source driving chip 8 such as the buffer GOP that Figure 10 is illustrated.In other words,
Aforementioned positive electrode buffer and negative polarity buffer can be then arranged at outside source driving chip 8 such as the buffer GOP that Figure 10 is illustrated.
8th embodiment
It refer to Fig. 2 and Figure 11, Figure 11 be schematically shown as a kind of flow chart of display drive method according to the 8th embodiment.It is aobvious
Show that driving method comprises the following steps：First as shown by step 201, the supply voltage VDD needed for positive polarity buffer 15 is supplied
And supply voltage VMID so that the output cathode reference voltage VPG of positive polarity buffer 15.Then as shown in step 202, supply
Supply voltage VMID and supply voltage VGND needed for negative polarity buffer 16 so that the output negative pole of negative polarity buffer 16 is joined
Examine voltage VNG.And then as depicted at step 203, according to positive polarity reference voltage VPG and negative polarity reference voltage VNG driving panels
11。
In summary, although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention.This hair
Bright one of ordinary skill in the art, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Therefore,
Protection scope of the present invention is worked as to be defined depending on appended claims institute defender.
Claims (15)
1. a kind of buffer circuit, including：
One positive polarity buffer, to receive one first supply voltage and a second source voltage so that the positive polarity buffer
A positive polarity reference voltage to a positive polarity resistance string is exported, the second source voltage is less than first supply voltage, and this first
Supply voltage is more than a ground voltage, and the second source voltage is more than the ground voltage；
One supply voltage output circuit, to provide the second source voltage；And
One negative polarity buffer, to receive the second source voltage and one the 3rd supply voltage so that the negative polarity buffer
Exporting a negative polarity reference voltage to a negative polarity resistance string, the 3rd supply voltage is less than the second source voltage, and the 3rd
Supply voltage is the ground voltage.
2. buffer circuit as claimed in claim 1, wherein the positive polarity buffer include：
One first power end, to receive first supply voltage；
One second source end, to receive the second source voltage；And
One first output end, it is coupled to the positive polarity resistance string.
3. buffer circuit as claimed in claim 2, wherein the negative polarity buffer include：
One the 3rd power end, to receive the second source voltage；
One the 4th power end, to receive the 3rd supply voltage；And
One second output end, it is coupled to the negative polarity resistance string.
4. buffer circuit as claimed in claim 3, wherein the positive polarity buffer also include a positive input level and a positive output
Level, the positive input level couple the positive output level, and first power end and the second source end couple the positive output level, the negative polarity
Buffer includes a negative input level and a negative output level, and the negative input level couples the negative output level, the 3rd power end and this
Four power ends couple the negative output level.
5. buffer circuit as claimed in claim 4, wherein the positive output level are defeated including one first output transistor and one second
Go out transistor, second output transistor couples first output transistor, and first power end couples the first output crystalline substance
The source electrode of body pipe, the second source end couple the source electrode of second output transistor, and it is brilliant that the negative output level includes one the 3rd output
Body pipe and one the 4th output transistor, the 4th output transistor couple the 3rd output transistor, and the 3rd power end coupling
The source electrode of the 3rd output transistor is connect, the 4th power end couples the source electrode of the 4th output transistor.
6. buffer circuit as claimed in claim 3, wherein the positive polarity buffer also include a positive input level and a positive output
Level, the positive input level couple the positive output level, and first power end and the second source end couple the positive input level, the negative polarity
Buffer includes a negative input level and a negative output level, and the negative input level couples the negative output level, the 3rd power end and this
Four power ends couple the negative input level.
7. buffer circuit as claimed in claim 6, wherein the positive input level include one first current source, one second current source,
One first input transistors, one second input transistors, one the 3rd input transistors and one the 4th input transistors, this is first defeated
Enter transistor and second input transistors are coupled to first current source, the 3rd input transistors and the 4th input crystal
Pipe is coupled to second current source, and the second source end couples first current source, and first power end couples second electric current
Source, the negative input level include one the 3rd current source, one the 4th current source, one the 5th input transistors, one the 6th input transistors,
One the 7th input transistors and one the 8th input transistors, the 5th input transistors and the 6th input transistors are coupled to this
3rd current source, the 7th input transistors and the 8th input transistors are coupled to the 4th current source, the 4th power end
The 3rd current source is coupled, the 3rd power end couples the 4th current source.
8. buffer circuit as claimed in claim 1, in addition to：
One first choice switchs, and the second source voltage is replaced with into the 3rd supply voltage, and exports to the positive polarity
Buffer；And
One second selecting switch, the second source voltage is replaced with into first supply voltage, and export to the negative polarity
Buffer.
9. buffer circuit as claimed in claim 1, wherein the positive polarity resistance string, the negative polarity resistance string, the positive polarity are delayed
Rush device and the negative polarity buffer is built into a source driving chip.
10. buffer circuit as claimed in claim 1, wherein the positive polarity resistance string and the negative polarity resistance string are built into a source
Pole driving chip, and the positive polarity buffer and the negative polarity buffer are not built into the source driving chip.
Compression buffer and an electricity during 11. buffer circuit as claimed in claim 1, wherein the supply voltage output circuit include one
Hold, the electric capacity couples compression buffer in this.
12. buffer circuit as claimed in claim 1, wherein the supply voltage output circuit are linear voltage regulator (Low Drop
Out, LDO).
13. buffer circuit as claimed in claim 1, wherein the supply voltage output circuit are buck converter (Back
Converter)。
14. a kind of panel module, including：
One panel；
One positive polarity resistance string；
One negative polarity resistance string；
One buffer circuit, including：
One positive polarity buffer, at least to receive one first supply voltage and a second source voltage so that the positive polarity is delayed
Rush device output one positive polarity reference voltage to the positive polarity resistance string, second source voltage and be less than first supply voltage, should
First supply voltage is more than a ground voltage, and the second source voltage is more than the ground voltage；
One supply voltage output circuit, to provide the second source voltage；And
One negative polarity buffer, at least to receive the second source voltage and one the 3rd supply voltage so that the negative polarity is delayed
Rush device output one negative polarity reference voltage to the negative polarity resistance string, the 3rd supply voltage and be less than the second source voltage, should
3rd supply voltage is the ground voltage；And
One drive circuit, to drive the panel according to the positive polarity reference voltage and the negative polarity reference voltage.
15. a kind of display drive method, including：
Supply a positive polarity buffer at least required one first supply voltage and a second source voltage so that the positive polarity is delayed
Rush device and export a positive polarity reference voltage, the second source voltage is less than first supply voltage, and first supply voltage is more than
One ground voltage, the second source voltage are more than the ground voltage, and the second source voltage is carried by a supply voltage output circuit
For；
Supply a negative polarity buffer at least required the second source voltage and one the 3rd supply voltage so that the negative polarity is delayed
Rush device and export a negative polarity reference voltage, the 3rd supply voltage is less than the second source voltage, and the 3rd supply voltage is should
Ground voltage；And
One panel is driven according to the positive polarity reference voltage and the negative polarity reference voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710971773.8A CN107680547B (en) | 2014-02-13 | 2014-02-13 | Buffer circuit, panel module and display driving method |
| CN201410050201.2A CN104851396B (en) | 2014-02-13 | 2014-02-13 | Buffer circuit, panel module and display drive method |
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| CN201410050201.2A CN104851396B (en) | 2014-02-13 | 2014-02-13 | Buffer circuit, panel module and display drive method |
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| US7605806B2 (en) * | 2004-07-23 | 2009-10-20 | Himax Technologies, Inc. | Data driving system and method for eliminating offset |
| JP4878795B2 (en) * | 2005-08-16 | 2012-02-15 | ルネサスエレクトロニクス株式会社 | Display control circuit and display control method |
| KR100918698B1 (en) * | 2007-11-20 | 2009-09-22 | 주식회사 실리콘웍스 | Offset compensation gamma buffer and gray scale voltage generation circuit using the same |
| US8854294B2 (en) * | 2009-03-06 | 2014-10-07 | Apple Inc. | Circuitry for independent gamma adjustment points |
| JP5241036B2 (en) * | 2009-07-07 | 2013-07-17 | ルネサスエレクトロニクス株式会社 | Liquid crystal display driver and liquid crystal display device |
| TWI417857B (en) * | 2009-09-23 | 2013-12-01 | Novatek Microelectronics Corp | Driving circuit of liquid crystal display |
| KR101101112B1 (en) * | 2010-01-19 | 2011-12-30 | 주식회사 실리콘웍스 | Circuit for generating gamma reference voltage of source driver |
| KR101050693B1 (en) * | 2010-01-19 | 2011-07-20 | 주식회사 실리콘웍스 | Gamma voltage output circuit of source driver circuit |
| KR101921990B1 (en) * | 2012-03-23 | 2019-02-13 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device |
-
2014
- 2014-02-13 CN CN201710971773.8A patent/CN107680547B/en active Active
- 2014-02-13 CN CN201410050201.2A patent/CN104851396B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107680547B (en) | 2021-04-13 |
| CN107680547A (en) | 2018-02-09 |
| CN104851396A (en) | 2015-08-19 |
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