CN110164387A - Gamma voltage generation circuit, driving circuit and its display device - Google Patents
Gamma voltage generation circuit, driving circuit and its display device Download PDFInfo
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- CN110164387A CN110164387A CN201810719089.5A CN201810719089A CN110164387A CN 110164387 A CN110164387 A CN 110164387A CN 201810719089 A CN201810719089 A CN 201810719089A CN 110164387 A CN110164387 A CN 110164387A
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Classifications
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- Crystallography & Structural Chemistry (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Picture Signal Circuits (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of gamma voltage generation circuit, driving circuit and its display devices, belong to field of display technology.Gamma voltage generation circuit includes: N number of current mirroring circuit, N number of current mirroring circuit is in parallel, the input terminal of each current mirroring circuit is connect with reference current output end, each current mirroring circuit is used to generate output electric current according to reference current, and exported by the output end of itself, the N is the integer greater than 1；Whether output control circuit controls the output end of each current mirroring circuit for controlling signal according to the position N that receives and connect with the input terminal of voltage generation circuit；The voltage generation circuit generates gamma electric voltage for electric current based on the received, and is exported by the output end of itself.According to the technical solution of the present invention, it can be improved the accuracy of the gamma electric voltage of generation.
Description
Technical field
The present invention relates to field of display technology, a kind of gamma voltage generation circuit, driving circuit and its display are particularly related to
Device.
Background technique
The effect of gamma (Gamma) voltage generation circuit is to set Gamma according to gamma curve required by display
Voltage carries out the voltage that gray scale is shown as Thin Film Transistor-LCD.Number of each Gamma voltage in source electrode driver
Under the action of mode converter, all gray scale voltages are generated.Currently, the gamma voltage generation circuit in liquid crystal display is generally set
In source electrode driver integrated circuit (Source Driver IC), gamma electric voltage is generated using the method for resistance string partial pressure, such as
Shown in Fig. 1.
In gamma voltage generation circuit shown in FIG. 1, there are problems that resistance mismatch, and the method for circuit can not be passed through
The problem of eliminating, leading to resistance mismatch can not solve, and not be suitable for the gamma voltage generation circuit of 10bits；And do current mirror
NMOS tube the problem of there is also mismatches, the mismatch of resistance and current mirror will lead to step electric current be not it is linearly increasing, this
The PMOS electric current and current mirror that sample is generated using the method that electric current is added can also generate mismatch, eventually lead to and flow through resistance generation
Gamma electric voltage be inaccurate.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of gamma voltage generation circuit, driving circuit and its display dresses
It sets, can be improved the accuracy of the gamma electric voltage of generation.
In order to solve the above technical problems, the embodiment of the present invention offer technical solution is as follows:
On the one hand, a kind of gamma voltage generation circuit is provided, the circuit includes:
N number of current mirroring circuit, the N number of current mirroring circuit is in parallel, and the input terminal of each current mirroring circuit is and base
The output end of quasi- electric current connects, and each current mirroring circuit is used to generate output electric current according to the reference current, and passes through
The output end output of itself, the N are the integer greater than 1；
Output control circuit, for controlling the output of each current mirroring circuit according to the position the N control signal received
Whether end connect with the input terminal of voltage generation circuit；
The voltage generation circuit generates gamma electric voltage for electric current based on the received, and defeated by the output end of itself
Out.
Further, the gamma voltage generation circuit further includes current generating circuit, for generating the reference current.
Further, the current generating circuit includes:
First reference voltage input, the second reference voltage input, and it is located at first reference voltage input
First resistor between second reference voltage input, the reference current are equal to the first reference voltage and the second benchmark
The voltage difference of voltage divided by first resistor resistance value.
Further, the current generating circuit further include:
First operational amplifier, non-inverting input terminal are connect with first reference voltage input, inverting input terminal and institute
The first end connection of first resistor is stated, output end is connect with the current mirroring circuit；
Second operational amplifier, non-inverting input terminal are connect with second reference voltage input, inverting input terminal and defeated
Outlet is connect with the second end of the first resistor.
Further, each current mirroring circuit includes the first transistor and second transistor of mirror image each other, the N
In a current mirroring circuit, the grid of all transistors is connect with the first end of the first resistor, the source electrode of all transistors
It is connect with the output end of first operational amplifier；In each current mirroring circuit, the first transistor drain electrode with
When the first end connection of the first resistor, the drain electrode of the second transistor is connect with the output end of the current mirroring circuit；
When the drain electrode of the second transistor is connect with the first end of the first resistor, the drain electrode of the first transistor with it is described
The output end of current mirroring circuit connects.
Further, in each current mirroring circuit, when current mirror control signal is high level, the first crystal
The drain electrode of pipe is connect with the first end of the first resistor, the drain electrode and the output of the current mirroring circuit of the second transistor
End connection；When current mirror control signal is low level, the drain electrode and the first end of the first resistor of the second transistor
Connection, the drain electrode of the first transistor are connect with the output end of the current mirroring circuit, wherein the current mirror control signal
The pulse signal for being 0.5 for duty ratio.
Further, in N number of current mirroring circuit, the breadth length ratio of transistor and previous electric current in latter current mirroring circuit
The breadth length ratio of transistor is identical in mirror circuit, and the number of transistor is crystal in previous current mirroring circuit in latter current mirroring circuit
2 times of the number of pipe.
Further, it is arranged between the output end of each current mirroring circuit and the input terminal of the voltage generation circuit
There is switch, the output control circuit is specifically used for switching on-off according to the position the N control signal control received.
Further, the voltage generation circuit includes:
Third operational amplifier and second resistance, the resistance value of the first resistor is equal with the resistance value of the second resistance,
The first end of the second resistance is connect with the input terminal of the voltage generation circuit, the second end of the second resistance with it is described
The output end of voltage generation circuit connects, the inverting input terminal of the third operational amplifier and the first end of the second resistance
Connection, the non-inverting input terminal of the third operational amplifier are connect with first reference voltage, the third operational amplifier
Output end connect with the second end of the second resistance.
Further, the N=10.
The embodiment of the invention also provides a kind of driving circuits, including gamma voltage generation circuit as described above.
The embodiment of the invention also provides a kind of display devices, including display panel and driving circuit as described above.
Further, the display panel is liquid crystal display panel or OLED display panel.
The embodiment of the present invention has the advantages that
In above scheme, N number of current mirroring circuit is in parallel, the input terminal of each current mirroring circuit with the output of reference current
End connection, each current mirroring circuit generate output electric current according to reference current, and output control circuit is controlled according to the position N received
Whether the output end that signal controls each current mirroring circuit connect with the input terminal of voltage generation circuit, voltage generation circuit according to
Received electric current generates gamma electric voltage, and is exported by the output end of itself.Technical solution of the present invention is not by resistance
The mode of string partial pressure generates gamma electric voltage, but gamma electric voltage is generated by the way of current distributing, avoids using resistance, leads to
The absolute value of the gamma electric voltage and resistance of crossing technical solution of the present invention generation is not related, eliminates since resistance mismatch causes
Finally flow through the problem of gamma electric voltage that resistance generates is inaccurate.
Detailed description of the invention
Fig. 1 is the circuit diagram that the existing method using resistance string partial pressure generates gamma electric voltage；
Fig. 2 is the structural schematic diagram of gamma voltage generation circuit of the embodiment of the present invention；
Fig. 3 is the circuit diagram of gamma voltage generation circuit of the embodiment of the present invention；
Fig. 4 is the circuit diagram of current mirroring circuit of the embodiment of the present invention；
Fig. 5 is the circuit diagram of gamma voltage generation circuit of the embodiment of the present invention.
Specific embodiment
To keep the embodiment of the present invention technical problems to be solved, technical solution and advantage clearer, below in conjunction with
Drawings and the specific embodiments are described in detail.
The embodiment of the present invention is for gamma electric voltage is generated using the method for resistance string partial pressure in the prior art, due to resistance
The problem of mismatch, can not solve the problem of that the gamma electric voltage for leading to flow through resistance generation is inaccurate, and provide a kind of gamma electric voltage
Generation circuit, driving circuit and its display device can be improved the accuracy of the gamma electric voltage of generation.
The embodiment of the present invention provides a kind of gamma voltage generation circuit, as shown in Fig. 2, the circuit includes:
N number of current mirroring circuit 12, N number of current mirroring circuit 12 is in parallel, the input terminal of each current mirroring circuit 12
It is connect with the output end of reference current, each current mirroring circuit 12 is used to generate output electricity according to the reference current
Stream, and exported by the output end of itself, the N is the integer greater than 1；
Output control circuit 13, for controlling the defeated of each current mirroring circuit according to the position the N control signal received
Whether outlet connect with the input terminal of voltage generation circuit 14；
The voltage generation circuit 14 generates gamma electric voltage, and the output end for passing through itself for electric current based on the received
Output.
In the present embodiment, N number of current mirroring circuit is in parallel, the input terminal of each current mirroring circuit with the output of reference current
End connection, each current mirroring circuit generate output electric current according to reference current, and output control circuit is controlled according to the position N received
Whether the output end that signal controls each current mirroring circuit connect with the input terminal of voltage generation circuit, voltage generation circuit according to
Received electric current generates gamma electric voltage, and is exported by the output end of itself.Technical solution of the present invention is not by resistance
The mode of string partial pressure generates gamma electric voltage, but gamma electric voltage is generated by the way of current distributing, avoids using resistance, leads to
The absolute value of the gamma electric voltage and resistance of crossing technical solution of the present invention generation is not related, eliminates since resistance mismatch causes
Finally flow through the problem of gamma electric voltage that resistance generates is inaccurate.
Wherein, reference current can be extraneous input, be also possible to by gamma voltage generation circuit generation, in benchmark
Electric current be gamma voltage generation circuit generate when, as shown in Fig. 2, gamma voltage generation circuit further include:
Current generating circuit 11, for generating the reference current.
Wherein, in N control signals each are corresponding with a current mirroring circuit, in the control signal wherein one take
When value is 1, the connection of the output end of corresponding current mirroring circuit and the input terminal of voltage generation circuit is connected in control, is believed in control
When a wherein value in number is 0, control disconnects the input of the output end and voltage generation circuit of corresponding current mirroring circuit
The value of the connection at end, N can be set as needed, and specifically, N can be with value for 10.
Reference current IA, the minimum list of reference current IA and current mirroring circuit output electric current can be generated in several ways
Relationship between the I of position depends on the digit of control signal, when controlling signal includes 10bit data i.e. 10 data, benchmark electricity
Flow IA=(210- 1) * I, when controlling signal includes 8bit data i.e. 8 data, reference current IA=(28- 1) * I, with such
It pushes away.
In a kind of concrete implementation mode, the current generating circuit includes:
First reference voltage input, the second reference voltage input, and it is located at first reference voltage input
First resistor between second reference voltage input, the reference current are equal to the first reference voltage and the second benchmark
The voltage difference of voltage divided by first resistor resistance value.
Further, as shown in figure 3, the current generating circuit further include:
First operational amplifier A1, non-inverting input terminal are connect with first reference voltage input, inverting input terminal with
The first end of the first resistor R connects, and output end is connect with N number of current mirroring circuit；
Second operational amplifier A2, non-inverting input terminal are connect with second reference voltage input, inverting input terminal with
The second end of the first resistor R connects, and output end is also connect with the second end of the first resistor R；
Wherein, the first reference voltage is VGMP, and the second reference voltage is VGSP.
In one specific embodiment, each current mirroring circuit includes the first transistor of mirror image and the second crystal each other
Pipe, the first transistor and second transistor can be PMOS tube, can also all be NMOS tube.It is brilliant with the first transistor and second
For body pipe is PMOS tube, as shown in Figure 3 and Figure 5, in N number of current mirroring circuit, the grid of all transistors is and institute
The first end connection of first resistor R is stated, the source electrode of all transistors is connect with the output end of the first operational amplifier A1.
To control signal as 10bit data instance, as shown in figure 3, gamma voltage generation circuit includes 10 current mirror electricity
Road, each current mirroring circuit include two transistors, and first current mirroring circuit includes transistor PM10 and PM11, second electricity
Current mirror circuit includes transistor PM20 and PM21, and third current mirroring circuit includes transistor PM30 and PM31 ..., the tenth electricity
Current mirror circuit includes transistor PM100 and PM101.
But the problem of two transistors in each current mirroring circuit are also likely to be present mismatch, in order to solve the mistake of current mirror
With problem, in each current mirroring circuit, when the drain electrode of the first transistor is connect with the first end of the first resistor, institute
The drain electrode for stating second transistor is connect with the output end of the current mirroring circuit；In the drain electrode of the second transistor and described the
One resistance first end connection when, the drain electrode of the first transistor is connect with the output end of the current mirroring circuit, in this way by
The drain electrode of the first transistor and second transistor alternately exports electric current, avoids the mismatch problems of current mirroring circuit.
Further, in each current mirroring circuit, when current mirror control signal is high level, the first crystal
The drain electrode of pipe is connect with the first end of the first resistor, the drain electrode and the output of the current mirroring circuit of the second transistor
End connection；When current mirror control signal is low level, the drain electrode and the first end of the first resistor of the second transistor
Connection, the drain electrode of the first transistor are connect with the output end of the current mirroring circuit, wherein the current mirror control signal
The pulse signal for being 0.5 for duty ratio.
As shown in Figure 4 and Figure 5, by taking first current mirroring circuit as an example, the grid of PM10 and the grid of PM11 are connected, PM10
Source electrode and the source electrode of PM11 connect, the drain electrode of PM10 switches between the end CHOP and the end XCHOP, and the drain electrode of PM11 is at the end CHOP
Switch between the end XCHOP, the end CHOP of the side PM10 is connect with the end XCHOP of the side PM11, the end XCHOP and the side PM11 of the side PM10
The end CHOP connection；The output end of first current mirroring circuit is connect with the end CHOP at the end XCHOP of the side PM10 and the side PM11.
For PM10, when the signal at the end CHOP is high level, the drain electrode of PM10 is connect with the end CHOP, in XCHOP
When the signal at end is high level, the drain electrode of PM10 is connect with the end XCHOP；For PM11, the signal at the end CHOP is high electricity
Usually, the drain electrode of PM11 is connect with the end CHOP, and when the signal at the end XCHOP is high level, the drain electrode of PM11 and the end XCHOP connect
It connects；Wherein, when CHOP signal is high level, XCHOP signal is low level；When CHOP signal is low level, XCHOP signal
For high level, in this way when CHOP signal is high level, the drain electrode of PM10 is not connect with the output end of current mirroring circuit, PM11's
Drain electrode is connect with the output end of current mirroring circuit；When CHOP signal is low level, the drain electrode of PM10 and current mirroring circuit it is defeated
Outlet connection, the drain electrode of PM11 is not connect with the output end of current mirroring circuit, in this way as CHOP signal is in high level and low electricity
Switch between flat, the output end in turn with current mirroring circuit is connect by the drain electrode of PM11 and the drain electrode of PM10, eliminates transistor
Between mismatch problems caused by existing deviation.And so on, transistor can also be eliminated in other N-1 current mirroring circuits
Between mismatch problems caused by existing deviation.
In order to guarantee in each current mirroring circuit the drain electrode of two transistors and the output end connection of current mirroring circuit when
Between it is equal, CHOP signal is the pulse signal that duty ratio is 0.5.
Further, in order to guarantee that different current mirroring circuits can export different electric currents, N number of current mirroring circuit
In, the breadth length ratio of transistor is identical in different current mirroring circuits, and the number of transistor is different in different current mirroring circuits.It is preferred that
Ground, in N number of current mirroring circuit, the number of transistor is transistor in previous current mirroring circuit in latter current mirroring circuit
2 times of number.For example, the number M=1 of the transistor in the 1st current mirroring circuit, then the crystal in the 2nd current mirroring circuit
The number M=2 of pipe, the number M=4 ... of the transistor in the 3rd current mirroring circuit, the crystal in the 10th current mirroring circuit
The number M=512 of pipe.
In specific embodiment, between the output end of each current mirroring circuit and the input terminal of the voltage generation circuit
It is provided with switch, the output control circuit is specifically used for switching on-off according to the position the N control signal control received,
To control whether the output end of corresponding current mirroring circuit is connected to the input terminal of the voltage generation circuit.
Specifically, as shown in figure 3, the voltage generation circuit includes:
Third operational amplifier A3 and second resistance R1, the resistance of the resistance value of the first resistor R and the second resistance R1
It is worth equal, the first end of the second resistance R1 is connect with the input terminal of the voltage generation circuit, the second resistance R1's
Second end is connect with the output end of the voltage generation circuit, the inverting input terminal of the third operational amplifier A3 and described the
The first end of two resistance R1 connects, and the non-inverting input terminal of the third operational amplifier A3 and the first reference voltage VGMP connect
It connects, the output end of the third operational amplifier A3 is connect with the second end of the second resistance R1.
Gamma voltage generation circuit of the invention is described further below with reference to Fig. 3 and Fig. 5:
In Fig. 3 and gamma voltage generation circuit shown in fig. 5, due to the presence of operational amplifier A1 and A2 amplifier, root
According to empty short principle, the pressure difference at the both ends resistance R is VGMP-VGSP, and the electric current of generation is benchmark electric current IA:
Due to the electricity of transistor PM10, PM20, PM30 ..., the grid of PM100, source electrode, drain electrode and substrate four termination
Press it is identical, so PM10, PM20, PM30 ..., each transistor of PM100 flowed through electric current Id10, Id20,
Id30 ..., Id100 size completely by PM10, PM20, PM30 ..., the M of PM100 determine, can be seen by Fig. 3 and Fig. 5
Out, in PM10, M=1；In PM20, M=2；In PM30, M=4；In PM40, M=8；..., in PM100, M=512, so:
And due to the presence of operational amplifier A3, the voltage of resistance R1 first end be VGMP namely transistor PM11,
PM21, PM31 ..., the drain terminal voltage of PM101 be VGMP；So transistor PM11, PM21, PM31 ..., the grid of PM101
Voltage and transistor PM10, PM2 that pole, source electrode, drain electrode and substrate four terminate, PM30 ..., the voltage that terminates of PM100 tetra-
Also identical respectively, transistor PM11, PM21, PM31 ..., PM101 flowed through electric current Id11, Id21, Id31 ...,
The size of Id101 completely by PM11, PM21, PM31 ..., the M of PM101 determine, in PM11 it can be seen from Fig. 3 and Fig. 5, M
=1；In PM21, M=2；In PM31, M=4；In PM41, M=8；..., in PM101, M=512, so:
Id11=Id10=I；Id21=Id20=2*I；Id31=Id30=4*I；
Id41=Id40=8*I；…；Id101=Id100=512*I.
Flow through the electric current of R1:
IR1=Id11*AD<0>+Id21*AD<1>+Id31*AD<2>+Id41*AD<3>+...+Id101*AD<9>:
Wherein, AD<m>is m+1 values in 10bit control signal, and m is more than or equal to 0 and is less than or equal to 9.
The gamma electric voltage VGAMMA=VGMP-IR1*R1 that gamma voltage generation circuit finally generates.
R1=R is taken, signal AD < 9:0 > is controlled for different 10bit:
If AD < 9:0 >=0000000000, IR1=0, VGAMMA=VGMP-0*R1=VGMP；
If AD < 9: 0 >=0000000001, IR1=Id11=I, VGAMMA=VGMP-I*R1=VGMP- (VGMP-
VGSP)/1023=(1022*VGMP+VGSP)/1023；
If AD < 9: 0 >=0000000010, IR1=Id21=2*I, VGAMMA=VGMP-2*I*R1=VGMP-2*
(VGMP-VGSP)/1023=(1021*VGMP+2*VGSP)/1023；
If AD<9:0>=0000000011, IR1=Id11+Id21=3*I, VGAMMA=VGMP-3*I*R1=VGMP-
3* (VGMP-VGSP)/1023=(1020*VGMP+3*VGSP)/1023；
……；
AD if<9:0>=1111111101, IR1=Id11+Id31+Id41+ ...+Id101=1021*I, VGAMMA=
VGMP-1021*I*R1=VGMP-1021* (VGMP-VGSP)/1023=(2*VGMP+1021*VGSP)/1023；
AD if<9:0>=1111111110, IR1=Id21+ ...+Id101=1022*I, VGAMMA=VGMP-1022*
I*R1=VGMP-1022* (VGMP-VGSP)/1023=(VGMP+1022*VGSP)/1023；
AD if<9:0>=1111111111, IR1=Id11+Id21+ ...+Id101=1023*I, VGAMMA=VGMP-
1023*I*R1=VGMP-1023* (VGMP-VGSP)/1023=VGSP；
So just produce corresponding 1024 gamma electric voltages of 10bits control signal.
As can be seen that gamma electric voltage is generated in the present embodiment by the way of electric current, using electric current addition and electric current tune
The method of section realizes the variation of gamma electric voltage, and the resistance quantity used greatly reduces, and then the mismatch due to resistance is avoided to draw
The error entered；And it solves the mismatch problems of current mirroring circuit, substantially increases the precision of the gamma electric voltage of output.
The embodiment of the invention also provides a kind of driving circuits, including gamma voltage generation circuit as described above.
In the gamma voltage generation circuit that the present embodiment driving circuit includes, N number of current mirroring circuit is in parallel, each current mirror
The input terminal of circuit is connect with the output end of reference current, and each current mirroring circuit generates output electric current according to reference current,
Whether output control circuit is electric with voltage generation according to the output end that the position the N control signal received controls each current mirroring circuit
The input terminal on road connects, and electric current generates gamma electric voltage to voltage generation circuit based on the received, and is exported by the output end of itself.
Technical solution of the present invention generates gamma electric voltage not by the mode that resistance string divides, but by the way of current distributing
Gamma electric voltage is generated, the absolute value of the gamma electric voltage and resistance that generate according to the technical solution of the present invention using resistance is avoided
It is not related, eliminate the problem of causing the gamma electric voltage for finally flowing through resistance generation to be inaccurate due to resistance mismatch.
The embodiment of the invention also provides a kind of display devices, including display panel and driving circuit as described above.Institute
Stating display device can be with are as follows: any product having a display function such as TV, display, Digital Frame, mobile phone, tablet computer or
Component, wherein the display device further includes flexible circuit board, printed circuit board and backboard.
Specifically, the display panel can be OLED display panel or be liquid crystal display panel.
In the gamma voltage generation circuit that the present embodiment display device includes, N number of current mirroring circuit is in parallel, each current mirror
The input terminal of circuit is connect with the output end of reference current, the benchmark that each current mirroring circuit is exported according to current generating circuit
Electric current generates output electric current, and output control circuit controls the output of each current mirroring circuit according to the position the N control signal received
Whether end connect with the input terminal of voltage generation circuit, and electric current generates gamma electric voltage to voltage generation circuit based on the received, and leads to
Cross the output end output of itself.Technical solution of the present invention generates gamma electric voltage not by the mode that resistance string divides, and
It is to generate gamma electric voltage by the way of current distributing, avoids the gal generated according to the technical solution of the present invention using resistance
The absolute value of horse voltage and resistance is not related, eliminates since resistance mismatch leads to the gamma electric voltage for finally flowing through resistance generation
The problem of being inaccurate.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of gamma voltage generation circuit, which is characterized in that the circuit includes:
N number of current mirroring circuit, N number of current mirroring circuit is in parallel, and the input terminal of each current mirroring circuit is electric with benchmark
The output end of stream connects, and each current mirroring circuit is used to generate output electric current according to the reference current, and passes through itself
Output end output, the N is integer greater than 1；
Output control circuit, the output end for controlling each current mirroring circuit according to the position the N control signal received are
It is no to be connect with the input terminal of voltage generation circuit；
The voltage generation circuit generates gamma electric voltage for electric current based on the received, and is exported by the output end of itself.
2. gamma voltage generation circuit according to claim 1, which is characterized in that the gamma voltage generation circuit is also wrapped
Current generating circuit is included, for generating the reference current.
3. gamma voltage generation circuit according to claim 2, which is characterized in that the current generating circuit includes:
First reference voltage input, the second reference voltage input, and it is located at first reference voltage input and institute
The first resistor between the second reference voltage input is stated, the reference current is equal to the first reference voltage and the second reference voltage
Voltage difference divided by first resistor resistance value.
4. gamma voltage generation circuit according to claim 3, which is characterized in that the current generating circuit further include:
First operational amplifier, non-inverting input terminal are connect with first reference voltage input, inverting input terminal and described the
The first end of one resistance connects, and output end is connect with the current mirroring circuit；
Second operational amplifier, non-inverting input terminal are connect with second reference voltage input, inverting input terminal and output end
It is connect with the second end of the first resistor.
5. gamma voltage generation circuit according to claim 4, which is characterized in that each current mirroring circuit includes mutual
For the first transistor and second transistor of mirror image, in N number of current mirroring circuit, the grid of all transistors is with described
The first end of one resistance connects, and the source electrode of all transistors is connect with the output end of first operational amplifier；Each electricity
In current mirror circuit, when the drain electrode of the first transistor is connect with the first end of the first resistor, the second transistor
Drain electrode connect with the output end of the current mirroring circuit；In the drain electrode and the first of the first resistor of the second transistor
When the connection of end, the drain electrode of the first transistor is connect with the output end of the current mirroring circuit.
6. gamma voltage generation circuit according to claim 5, which is characterized in that in each current mirroring circuit,
When current mirror control signal is high level, the drain electrode of the first transistor is connect with the first end of the first resistor, described
The drain electrode of second transistor is connect with the output end of the current mirroring circuit；It is described when current mirror control signal is low level
The drain electrode of second transistor is connect with the first end of the first resistor, the drain electrode of the first transistor and current mirror electricity
The output end on road connects, wherein the current mirror control signal is the pulse signal that duty ratio is 0.5.
7. gamma voltage generation circuit according to claim 1, which is characterized in that latter in N number of current mirroring circuit
The breadth length ratio of transistor is identical with the breadth length ratio of transistor in previous current mirroring circuit in current mirroring circuit, latter current mirroring circuit
The number of middle transistor is 2 times of the number of transistor in previous current mirroring circuit.
8. gamma voltage generation circuit according to claim 1, which is characterized in that the output of each current mirroring circuit
Switch is provided between end and the input terminal of the voltage generation circuit, the output control circuit is specifically used for basis and receives
The position N control signal control described in switch on-off.
9. gamma voltage generation circuit according to claim 1, which is characterized in that the voltage generation circuit includes:
Third operational amplifier and second resistance, the resistance value of the first resistor is equal with the resistance value of the second resistance, described
The first end of second resistance is connect with the input terminal of the voltage generation circuit, the second end of the second resistance and the voltage
The output end of generation circuit connects, and the inverting input terminal of the third operational amplifier and the first end of the second resistance connect
It connects, the non-inverting input terminal of the third operational amplifier is connect with first reference voltage, the third operational amplifier
Output end is connect with the second end of the second resistance.
10. gamma voltage generation circuit according to claim 1, which is characterized in that the N=10.
11. a kind of driving circuit, which is characterized in that generate electricity including gamma electric voltage such as of any of claims 1-10
Road.
12. a kind of display device, which is characterized in that including display panel and driving circuit as claimed in claim 11.
13. display device according to claim 12, which is characterized in that the display panel be liquid crystal display panel or
OLED display panel.
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| CN201810719089.5A CN110164387B (en) | 2018-07-03 | 2018-07-03 | Gamma voltage generating circuit, driving circuit and display device thereof |
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| CN110164387B CN110164387B (en) | 2024-02-27 |
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Cited By (1)
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| CN117316106A (en) * | 2023-11-29 | 2023-12-29 | 禹创半导体(深圳)有限公司 | OLED (organic light emitting diode) fast switching GAMMA circuit |
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| CN110164387B (en) | 2024-02-27 |
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