CN105575344B - Source electrode driver, its operation method and its driving circuit - Google Patents
Source electrode driver, its operation method and its driving circuit Download PDFInfo
- Publication number
- CN105575344B CN105575344B CN201410524552.2A CN201410524552A CN105575344B CN 105575344 B CN105575344 B CN 105575344B CN 201410524552 A CN201410524552 A CN 201410524552A CN 105575344 B CN105575344 B CN 105575344B
- Authority
- CN
- China
- Prior art keywords
- voltage
- reference voltage
- gray scale
- source electrode
- driving circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
A kind of source electrode driver of present invention offer, its operation method and its driving circuit.Source electrode driver includes a gamma voltage producing circuit, a first voltage buffer and a reference voltage driving circuit.Gamma voltage producing circuit receives an internal reference voltage, to provide one first gray scale reference voltages of corresponding one first display grayscale.First voltage buffer is to receive the first gray scale reference voltages, to provide a driving voltage.Reference voltage driving circuit couples gamma voltage producing circuit and first voltage buffer, to accelerate the rate of climb or decrease speed of the first gray scale reference voltages.The source electrode driver of the embodiment of the present invention, its operation method and its driving circuit, reference voltage driving circuit accelerate the rate of climb or decrease speed of the first gray scale reference voltages when the first gray scale reference voltages are transient state.Therefore, the static power consumption of source electrode driver can be reduced and do not influence the running of source electrode driver.
Description
Technical field
The present invention relates to a kind of a kind of driver more particularly to source electrode driver, its operation method and its driving circuits.
Background technology
In recent years, consumer electrical product is constantly weeded out the old and bring forth the new, and with it is light and handy it is short and small, do not take up space, penetrated without width, is low
Power consumption, liquid crystal display (the Liquid Crystal for not generating high fever, service life are high, picture is soft etc. characteristic
Display the interface for being used as picture output) is then widely used.In a liquid crystal display, it can be provided by source electrode driver
The required image data of panel of LCD, and multiple data channel of source electrode driver can be according to corresponding image number
According to the exported driving voltage of adjustment.
According to above-mentioned, when the power consumption of source electrode driver increases, the overall power consumption of liquid crystal display can also increase
Add.Therefore, how then to become design source electrode in the power consumption for adjusting and reducing source electrode driver for not influencing driving voltage to drive
One emphasis of dynamic device.
Invention content
A kind of source electrode driver of present invention offer, its operation method and its driving circuit, can reduce the quiet of source electrode driver
State power consumption and the running for not influencing source electrode driver.
The source electrode driver of the present invention, including a gamma voltage producing circuit, a first voltage buffer and one are with reference to electricity
Press driving circuit.Gamma voltage producing circuit receives an internal reference voltage, to provide the one the of corresponding one first display grayscale
One gray scale reference voltages.First voltage buffer is to receive the first gray scale reference voltages, to provide a driving voltage.With reference to electricity
Driving circuit coupling gamma voltage producing circuit and first voltage buffer are pressed, to accelerate the rising of the first gray scale reference voltages
Speed or decrease speed.
The driving circuit of the present invention, to drive a display panel, including time schedule controller, a gamma voltage to generate electricity
Road, a first voltage buffer, a reference voltage driving circuit and a voltage-selected switch.Sequence controller is aobvious to provide one
Registration evidence.Gamma voltage producing circuit receives an internal reference voltage, to provide one first ash of corresponding one first display grayscale
Rank reference voltage.First voltage buffer is to receive the first gray scale reference voltages, to provide a driving voltage.Reference voltage drives
Dynamic circuit couples gamma voltage producing circuit and first voltage buffer, to accelerate the first gray scale reference voltages reply or
The change of its voltage quasi position.One input terminal of voltage-selected switch receives the first ash provided from gamma voltage producing circuit
Rank reference voltage, and an output end of voltage-selected switch provides the first gray scale reference voltages to first voltage buffer,
Middle voltage-selected switch is connected the corresponding grayscale value of display data and is identical to the first display grayscale.
In one embodiment of this invention, reference voltage driving circuit coupling gamma voltage producing circuit is opened with voltage selection
The input terminal of pass.
In one embodiment of this invention, reference voltage driving circuit includes a second voltage buffer, input termination
A driving reference voltage is received, output end couples the first gray scale reference voltages.
In one embodiment of this invention, source electrode driver further includes a voltage drop detection circuit, to detect the first grayscale
One voltage quasi position of reference voltage, to decide whether to start second voltage buffer.
In one embodiment of this invention, source electrode driver includes a data detection circuit, according to display data and first
Display grayscale decides whether to start second voltage buffer, wherein when the corresponding grayscale value of display data is identical to the first display ash
When rank, data detection circuit starts reference voltage driving circuit.
In one embodiment of this invention, second voltage buffer receives an external control signal, to be controlled according to external
Signal and start, and external control signal enables to be identical to the first display grayscale in display data.
In one embodiment of this invention, reference voltage driving circuit include a first transistor, the one of the first transistor
First end receives a driving reference voltage, and a second end of the first transistor couples the first gray scale reference voltages.
In one embodiment of this invention, a control terminal of the first transistor receives internal reference voltage.
In one embodiment of this invention, the first end of the control terminal coupling the first transistor of the first transistor.
In one embodiment of this invention, reference voltage driving circuit further includes a voltage operational circuit, receives an operation
Reference voltage and a control reference signal, and a control terminal of the first transistor is coupled, with according to control reference signal conducting the
One transistor, wherein control reference signal enables to be identical to the first display grayscale in the corresponding grayscale value of display data.
In one embodiment of this invention, voltage operational circuit includes a first resistor and a second resistance.First resistor
It couples between operation reference voltage and the control terminal of the first transistor.Second resistance couples control terminal and the control of the first transistor
Between reference signal.
In one embodiment of this invention, reference voltage driving circuit includes a diode, one driving reference voltage of coupling
Between the first gray scale reference voltages.
In one embodiment of this invention, gamma voltage producing circuit includes a tertiary voltage buffer and a resistance string.
Tertiary voltage buffer receives internal reference voltage to generate a gamma reference voltage.Resistance string receives gamma reference voltage, with
The multiple gray scale reference voltages for including the first gray scale reference voltages are provided after being divided to gamma reference voltage.
In one embodiment of this invention, reference voltage driving circuit coupling gamma voltage producing circuit and first voltage are slow
It rushes between device.
The operation method of the source electrode driver of the present invention, includes the following steps.It is received by a gamma voltage producing circuit
One internal reference voltage, to provide one first gray scale reference voltages of corresponding one first display grayscale.It is slow by a first voltage
It rushes device and receives the first gray scale reference voltages, to provide a driving voltage.Accelerate the first grayscale by a reference voltage driving circuit
The rate of climb or decrease speed of reference voltage.
In one embodiment of this invention, the operation method of source electrode driver further includes：When under the first gray scale reference voltages
When one voltage difference of drop is more than a critical value, start reference voltage driving circuit.
In one embodiment of this invention, the operation method of source electrode driver further includes：When under the first gray scale reference voltages
One voltage difference of drop is when enabling, to start more than the external control signal that a critical value or reference voltage driving circuit are received
Reference voltage driving circuit.
In one embodiment of this invention, external control signal is provided by the time schedule controller of a display, and
The corresponding grayscale value of a display data that external control signal enables to receive in source electrode driver is identical to the first display grayscale.
In one embodiment of this invention, the operation method of source electrode driver further includes：When reference voltage driving circuit institute
When the external control signal received is enabled, start reference voltage driving circuit.
Based on above-mentioned, the source electrode driver of the embodiment of the present invention, its operation method and its driving circuit, reference voltage drives
Dynamic circuit accelerates the rate of climb or decrease speed of the first gray scale reference voltages when the first gray scale reference voltages are transient state.Cause
This, can reduce the static power consumption of source electrode driver and not influence the running of source electrode driver.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and it is detailed to coordinate attached drawing to make
Carefully it is described as follows.
Description of the drawings
Fig. 1 is the system schematic of the display of one embodiment of the invention；
Fig. 2 is the circuit diagram of the source electrode driver of first embodiment of the invention；
Fig. 3 is the circuit diagram of the source electrode driver of second embodiment of the invention；
Fig. 4 is the circuit diagram of the source electrode driver of third embodiment of the invention；
Fig. 5 is the circuit diagram of the source electrode driver of fourth embodiment of the invention；
Fig. 6 is the circuit diagram of the source electrode driver of fifth embodiment of the invention；
Fig. 7 is the circuit diagram of the source electrode driver of sixth embodiment of the invention；
Fig. 8 A are the circuit diagram of the source electrode driver of seventh embodiment of the invention；
Fig. 8 B are the circuit diagram of the voltage operational circuit of one embodiment of the invention；
Fig. 9 is the circuit diagram of the source electrode driver of eighth embodiment of the invention；
Figure 10 is the circuit diagram of the source electrode driver of ninth embodiment of the invention；
Figure 11 is the circuit diagram of the source electrode driver of tenth embodiment of the invention；
Figure 12 is the circuit diagram of the source electrode driver of eleventh embodiment of the invention；
Figure 13 is the circuit diagram of the source electrode driver of twelveth embodiment of the invention；
Figure 14 is the flow chart of the operation method of the source electrode driver of one embodiment of the invention.
Reference sign：
100：Display；
110：Display panel；
111：Driving circuit；
120：Sequence controller；
130：Source electrode driver；
131：Digital control circuit
133,133a~133k：Reference voltage driving circuit；
135、135a：Digital analog converter；
137,137a~137b：Gamma voltage producing circuit；
210、410：Voltage drop detection circuit；
510：Data detection circuit；
810、910：Voltage operational circuit；
BF1：First voltage buffer；
BF2、BF2a：Second voltage buffer；
BF3、BF3a：Tertiary voltage buffer；
BF4：4th voltage buffer；
D1：Diode；
DP1：Display data；
GR1：First display grayscale；
R1：First resistor；
R2：Second resistance；
RS1：Resistance string；
Rx：Resistance；
SCE1~SCE4：External control signal；
SCR：Control reference signal；
Simage：Video signal；
SSE：Voltage selection signal；
SW1：First voltage switchs；
SW2：Second voltage switchs；
SWS：Voltage-selected switch；
T1、T2：The first transistor；
T12：Second transistor；
T13：Third transistor；
VB1：First bias；
VB2：Second bias；
VDD：System high voltage；
VDX：Driving voltage；
VGB：Gamma reference voltage；
VGR1：First gray scale reference voltages；
VGR2：Second gray scale reference voltages；
VRD：Drive reference voltage；
VRI：Internal reference voltage；
VROP：Operation reference voltage；
VSS：System low-voltage；
S1410, S1420 and S1430：Step.
Specific implementation mode
Fig. 1 is the system schematic of the display of one embodiment of the invention.Fig. 1 is please referred to, in this example it is shown that device
100 include the driving circuit 111 of display panel 110 and driving display panel 110, and wherein driving circuit 111 is for example including sequential
Controller 120 and source electrode driver 130.Sequence controller is receiving a video signal Simage to provide display data DP1
To source electrode driver 130.
Source electrode driver 130 is for example including digital control circuit 131, reference voltage driving circuit 133, digital analog converter
135, gamma voltage producing circuit 137 and first voltage buffer BF1.Gamma voltage producing circuit 137 receives internal reference electricity
VRI is pressed, to provide the first gray scale reference voltages VGR1 of corresponding first display grayscale (one of such as grayscale value 0~255).
Digital control circuit 131 receives display data DP1, to provide corresponding Voltage selection signal SSE.
Digital analog converter 135 couples between digital control circuit 131 and gamma voltage producing circuit 137, with according to voltage
Selection signal SSE decides whether to provide the first gray scale reference voltages VGR1.In other words, when display data DP1 is corresponding first ash
When the first display grayscale of rank reference voltage VGR1, digital analog converter 135 can be controlled by Voltage selection signal SSE and provide first
Gray scale reference voltages VGR1；Conversely, when the first display grayscale that display data DP1 is the first gray scale reference voltages of non-corresponding VGR1
When, digital analog converter 135 can be controlled by Voltage selection signal SSE without providing the first gray scale reference voltages VGR1.
Reference voltage driving circuit 133 couples digital analog converter 135 and receives driving reference voltage VRD, to accelerate number
The reply of first gray scale reference voltages VGR1 or the change of its voltage quasi position in mode converter 135, that is, accelerate the first grayscale ginseng
Examine the rates of climb or decrease speed of the voltage VGR1 in transient state.First voltage buffer BF1 is receiving digital analog converter 135
After the first gray scale reference voltages VGR1 provided, driving voltage VDX is accordingly provided to display panel 110.Wherein, driving ginseng
Examine voltage VRD can be any voltage (such as internal reference voltage VRI, gamma voltage producing circuit 137 provided other ash
Rank reference voltage or system high voltage).
According to above-mentioned, reference voltage driving circuit 133 can operate on the first gray scale reference voltages VGR1 generate transient state when
It waits, therefore will produce dynamic current, but not generate quiescent current, that is, can avoid increasing the Static Electro of source electrode driver 130
Stream.Therefore, the reference voltage driving circuit 133 of the present embodiment can accelerate reply or its voltage of the first gray scale reference voltages VGR1
The change of level, but not increase the quiescent current of source electrode driver 130.
Fig. 2 is the circuit diagram of the source electrode driver of first embodiment of the invention.Fig. 1 and Fig. 2 is please referred to, wherein identical
Or similar components use same or similar label.In the present embodiment, digital analog converter 135a include voltage-selected switch
The input terminal of SWS, wherein voltage-selected switch SWS receive the first grayscale ginseng provided from gamma voltage producing circuit 137a
Examine voltage VGR1, the output end of voltage-selected switch SWS buffers to provide the first gray scale reference voltages VGR1 to first voltage
Device BF1, and voltage-selected switch SWS is controlled by Voltage selection signal SSE and is connected or is not turned on.
Reference voltage driving circuit 133a is for example including second voltage buffer BF2 and voltage drop detection circuit 210.Second electricity
The input terminal of compression buffer BF2 receives internal reference voltage VRI (equally driving reference voltage VRD), second voltage buffer BF2
Output end be coupled to the input terminal (be equal to and be coupled to the first gray scale reference voltages VGR1) of voltage-selected switch SWS.Change speech
It, reference voltage driving circuit 133a is coupled to the input terminal of gamma voltage producing circuit 137a and voltage-selected switch SWS.
Voltage drop detection circuit 210 couples second voltage buffer BF2 and the first gray scale reference voltages VGR1, to detect the
The voltage quasi position of one gray scale reference voltages VGR1, to decide whether to start second voltage buffer BF2.Furthermore, it is understood that when the
When the voltage difference that one gray scale reference voltages VGR1 declines is more than a critical value, voltage drop detection circuit 210 starts second voltage buffering
Device BF2, to accelerate the reply speed of the first gray scale reference voltages VGR1；When the first gray scale reference voltages VGR1 remain unchanged or under
When the voltage difference of drop is less than or equal to critical value, voltage drop detection circuit 210 does not start second voltage buffer BF2 then.
Gamma voltage producing circuit 137a is for example including tertiary voltage buffer BF3, after receiving internal reference voltage VRI
First gray scale reference voltages VGR1 is provided.
In addition, in the above-described embodiments, the input terminal of second voltage buffer BF2 is reception internal reference voltage VRI, but
In other embodiments, the input terminal of second voltage buffer BF2 is its that can receive that gamma voltage producing circuit 137 provided
His gray scale reference voltages or system high voltage, but the embodiment of the present invention is not limited.
Fig. 3 is the circuit diagram of the source electrode driver of second embodiment of the invention.Fig. 2 and Fig. 3 is please referred to, wherein identical
Or similar components use same or similar label.In the present embodiment, reference voltage driving circuit 133b is coupled to gamma electricity
The output end of generation circuit 137a and voltage-selected switch SWS are pressed, that is, the second voltage of reference voltage driving circuit 130b is slow
The output end for rushing device BF2 is coupled to the output end of voltage-selected switch SWS.
Fig. 4 is the circuit diagram of the source electrode driver of third embodiment of the invention.Fig. 2 and Fig. 4 is please referred to, wherein identical
Or similar components use same or similar label.In the present embodiment, the voltage drop detection circuit of reference voltage driving circuit 133c
410 also receive external control signal SCE1, that is, electricity of the voltage drop detection circuit 410 in addition to detecting the first gray scale reference voltages VGR1
Level is pressed, to decide whether to start second voltage buffer BF2, can also decide whether startup the according to external control signal SCE1
Two voltage buffer BF.Furthermore, it is understood that when the first gray scale reference voltages VGR1 voltage differences declined are more than critical value or outside
It is when enabling to control signal SCE1, and voltage drop detection circuit 410 starts second voltage buffer BF2；When the first gray scale reference voltages
VGR1 remains unchanged or the voltage difference that declines is when to be less than or equal to critical value and external control signal SCE1 be forbidden energy, voltage drop detection
Circuit 410 does not start second voltage buffer BF2 then.
In one embodiment of this invention, external control signal SCE1 can be by 120 institute of sequence controller of display 100
It provides, and the grayscale value corresponding to the external control signal SCE1 display data DP1 that can enable to receive in source electrode driver 130
It is identical to the corresponding grayscale values of the first gray scale reference voltages VGR1 (that is, first display grayscale).But in other embodiments, outside
Portion control signal SCE1 can be provided by any control circuit, and the embodiment of the present invention is not limited.
Fig. 5 is the circuit diagram of the source electrode driver of fourth embodiment of the invention.Fig. 2 and Fig. 5 is please referred to, wherein identical
Or similar components use same or similar label.In the present embodiment, reference voltage driving circuit 133d is approximately identical to reference
Voltag driving circuit 133a, the difference is that the data detection circuit 510 of reference voltage driving circuit 133d.Data Detection
Circuit 510 receives display data DP1 and the corresponding grayscale values of the first gray scale reference voltages VGR1 (that is, the first display grayscale
GR1), decide whether to start the second electricity with the displays of the display data DP1 received according to source electrode driver 130 and first grayscale GR1
Compression buffer BF2.
Furthermore, it is understood that when the corresponding grayscale values of display data DP1 are identical to the first display grayscale GR1, Data Detection
Circuit 510 starts the second voltage buffer BF2 of reference voltage driving circuit 133d；When the corresponding grayscale values of display data DP1
When different from the first display grayscale GR1, data detection circuit 510 does not start second voltage buffer BF2.
Fig. 6 is the circuit diagram of the source electrode driver of fifth embodiment of the invention.Fig. 2 and Fig. 6 is please referred to, wherein identical
Or similar components use same or similar label, the difference is that the second voltage buffering of reference voltage driving circuit 133e
Device BF2a.Second voltage buffer BF2a receives external control signal SCE2, to start according to external control signal SCE2.
Furthermore, it is understood that when external control signal SCE1 is enabled, second voltage buffer BF2a is activated；Work as external control signal
When SCE1 is forbidden energy, then second voltage buffer BF2a is not started.
In one embodiment of this invention, external control signal SCE2 can be by 120 institute of sequence controller of display 100
It provides, and the grayscale value corresponding to the external control signal SCE2 display data DP1 that can enable to receive in source electrode driver 130
It is identical to the corresponding grayscale values of the first gray scale reference voltages VGR1 (that is, first display grayscale).But in other embodiments, outside
Portion control signal SCE2 can be provided by any control circuit, and the embodiment of the present invention is not limited.
Fig. 7 is the circuit diagram of the source electrode driver of sixth embodiment of the invention.Fig. 2 and Fig. 7 is please referred to, wherein identical
Or similar components use same or similar label, the difference is that reference voltage driving circuit 133f includes the first transistor
T1.The drain electrode (corresponding first end) of the first transistor T1 receives internal reference voltage VRI (equally driving reference voltage VRD), the
The grid of source electrode (corresponding second end) coupling first gray scale reference voltages VGR1, the first transistor T1 of one transistor T1 is (corresponding
Control terminal) receive internal reference voltage.At this point, the grid of the first transistor T1 is coupled to its drain electrode.
In addition, in the present embodiment, the base terminal of the first transistor T1 can couple the first gray scale reference voltages VGR1, with drop
The substrate effect of low the first transistor T1.Also, in the above-described embodiments, the drain electrode of the first transistor T1 is to receive internal reference
Voltage VRI, but in other embodiments, the drain electrode input terminal of the first transistor T1 is to can receive gamma voltage producing circuit 137
Other gray scale reference voltages or system high voltage provided, but the embodiment of the present invention is not limited.
Fig. 8 A are the circuit diagram of the source electrode driver of seventh embodiment of the invention.Please refer to Fig. 2 and Fig. 8 A, wherein phase
Same or similar components use same or similar label, the difference is that reference voltage driving circuit 133g includes first crystal
Pipe T2 and voltage operational circuit 810.It is (equivalent that the drain electrode (corresponding first end) of the first transistor T2 receives internal reference voltage VRI
Drive reference voltage VRD), the source electrode of the first transistor T2 (corresponding second end) the first gray scale reference voltages of coupling VGR1, first
Grid (corresponding control terminal) coupling voltage operational circuit 810 of transistor T2.Voltage operational circuit 810 receives operation reference voltage
VROP and control reference signal SCR, with according to control reference signal SCR conducting the first transistors T2.
In the above-described embodiments, the drain electrode of the first transistor T2 is reception internal reference voltage VRI, but in other embodiment
In, the drain electrode input terminal of the first transistor T2 is other grayscale reference electricity that can receive gamma voltage producing circuit 137 and provided
Pressure or system high voltage, but the embodiment of the present invention is not limited.Also, controlling reference signal SCR can be by display 100
Sequence controller 120 is provided, and controls the display data DP1 that reference signal SCR can enable to receive in source electrode driver 130
Corresponding grayscale value is identical to the corresponding grayscale values of the first gray scale reference voltages VGR1 (that is, first display grayscale).But at it
In his embodiment, control reference signal SCR can be provided by any control circuit, and the embodiment of the present invention is not limited.
Fig. 8 B are the circuit diagram of the voltage operational circuit of one embodiment of the invention.Fig. 8 A and Fig. 8 B are please referred to, wherein
Same or similar element uses same or similar label.In the present embodiment, voltage operational circuit 810 is for example including first resistor
R1 and second resistance R2.Between first resistor R1 coupling operation reference voltage VROP and the grid of the first transistor T2.Second electricity
Between the grid and control reference signal SCR that hinder R2 coupling the first transistors T2.
Fig. 9 is the circuit diagram of the source electrode driver of eighth embodiment of the invention.Please refer to Fig. 8 A and Fig. 9, wherein phase
Same or similar components use same or similar label.In the present embodiment, reference voltage driving circuit 133h is approximately identical to ginseng
Voltag driving circuit 133g is examined, the difference is that the voltage operational circuit 910 of reference voltage driving circuit 133f.Voltage is transported
It calculates circuit 910 and receives operation reference voltage VROP and the first gray scale reference voltages VGR1, with according to the first gray scale reference voltages
The first transistor T2 is connected in VGR1.
Figure 10 is the circuit diagram of the source electrode driver of ninth embodiment of the invention.Please refer to Fig. 2 and Figure 10, wherein phase
Same or similar components use same or similar label, the difference is that reference voltage driving circuit 133i includes diode
D1, coupling internal reference voltage VRI (equally driving reference voltage VRD) are between the first gray scale reference voltages VGR1.
Figure 11 is the circuit diagram of the source electrode driver of tenth embodiment of the invention.Please refer to Fig. 2 and Figure 11, wherein phase
Same or similar components use same or similar label, the difference is that gamma voltage producing circuit 137b further includes by multiple
The resistance string RS1 that resistance Rx is constituted.Here, tertiary voltage buffer BF3a generates gamma after receiving internal reference voltage VRI
Reference voltage V GB.It is provided after resistance string RS1 receives gamma reference voltage VGB, after being divided to gamma reference voltage VGB more
A gray scale reference voltages (such as the first gray scale reference voltages VGR1 and the second gray scale reference voltages VGR2), wherein resistance string RS1 institutes
Voltage between multiple gray scale reference voltages (such as the first gray scale reference voltages VGR1 and the second gray scale reference voltages VGR2) is provided
Difference can be different from each other, but the embodiment of the present invention is not limited.
Also, in the present embodiment, the input terminal of the second buffer of reference voltage driving circuit 133a receives corresponding another
Second gray scale reference voltages VGR2 of one display grayscale (that is, second display grayscale), wherein the second gray scale reference voltages VGR2
E.g. it is higher than the first gray scale reference voltages VGR1.
Figure 12 is the circuit diagram of the source electrode driver of eleventh embodiment of the invention.Fig. 2 and Figure 12 is please referred to, wherein
Same or similar element uses same or similar label.In the present embodiment, reference voltage driving circuit 133j couples digital-to-analogue and turns
Between parallel operation 135a and first voltage buffer BF1, that is, couple gamma voltage producing circuit 137a and first voltage buffer
Between BF1.Also, reference voltage driving circuit 133j includes the 4th voltage buffer BF4 and first voltage switch SW1.
Its input terminal of 4th voltage buffer BF4 couples digital analog converter 135a to receive the first gray scale reference voltages
The input terminal of the output end coupling first voltage buffer BF1 of VGR1, the 4th voltage buffer BF4, and the 4th voltage buffer
Device BF4 receives external control signal SCE3, to start according to external control signal SCE3.First voltage switch SW1 parallel connection couplings
The input terminal and output end of the 4th voltage buffer BF4 are connect, and receives external control signal SCE3, with according to external control signal
SCE3 and be not turned on.In other words, when the 4th voltage buffer BF4 starts, first voltage switch SW1 is not turned on；When the 4th electricity
When compression buffer BF4 does not start, first voltage switch SW1 is conducting.
In one embodiment of this invention, external control signal SCE3 can be by 120 institute of sequence controller of display 100
It provides, and the grayscale value corresponding to the external control signal SCE3 display data DP1 that can enable to receive in source electrode driver 130
The display data DP1 (that is, previous display data) previously received different from source electrode driver 130.But in other embodiment
In, external control signal SCE3 can be provided by any control circuit, and the embodiment of the present invention is not limited.
Figure 13 is the circuit diagram of the source electrode driver of twelveth embodiment of the invention.Fig. 2 and Figure 13 is please referred to, wherein
Same or similar element uses same or similar label.In the present embodiment, reference voltage driving circuit 133k couples digital-to-analogue and turns
Between parallel operation 135a and first voltage buffer BF1.Also, reference voltage driving circuit 133k include second voltage switch SW2,
Second transistor T12 and third transistor T13.
Second voltage switch SW2 receives the first gray scale reference voltages VGR1 to provide the first gray scale reference voltages VGR1 to the
The input terminal of one voltage buffer BF1, and external control signal SCE4 is received, with foundation external control signal SCE4 without leading
It is logical.System high voltage VDD (corresponding first driving reference voltage) is received in the drain electrode (corresponding first termination) of second transistor T12, the
The input terminal of source electrode (corresponding second end) coupling first voltage buffer BF1 of two-transistor T12, the grid of second transistor T12
Pole (corresponding control terminal) receives the first gray scale reference voltages VGR1, and the base terminal of second transistor T12 receives the first voltage bias VB 1.
The source electrode (corresponding first end) of third transistor T13 receives the input terminal of first voltage buffer BF1, third transistor T13's
Drain electrode (corresponding second end) coupling system low-voltage VSS (corresponding second driving reference voltage), the grid of third transistor T13
(corresponding control terminal) receives the first gray scale reference voltages VGR1, and the base terminal of third transistor T13 receives the second voltage bias VB 2.
In one embodiment of this invention, external control signal SCE4 can be by 120 institute of sequence controller of display 100
It provides, and the grayscale value corresponding to the external control signal SCE4 display data DP1 that can enable to receive in source electrode driver 130
The display data DP1 (that is, previous display data) previously received different from source electrode driver 130.But in other embodiment
In, external control signal SCE4 can be provided by any control circuit, and the embodiment of the present invention is not limited.
Figure 14 is the flow chart of the operation method of the source electrode driver of one embodiment of the invention.Figure 14 is please referred to, in this reality
It applies in example, the operation method of source electrode driver includes the following steps.Internal reference voltage is received by gamma voltage producing circuit,
To provide the first gray scale reference voltages (step S1410) of corresponding first display grayscale.The is received by first voltage buffer
One gray scale reference voltages, to provide driving voltage (step S1420).Then, the first ash is accelerated by reference to Voltag driving circuit
The rate of climb or decrease speed (step S1430) of rank reference voltage.Wherein, above-mentioned steps S1410, S1420 and S1430's is suitable
Sequence is to illustrate, the embodiment of the present invention is not limited.Also, above-mentioned steps S1410, S1420 and the details of S1430 can join
Shown in embodiment according to Fig. 1 to Figure 13, it will not be described in detail here.
In conclusion the source electrode driver of the embodiment of the present invention, its operation method and its driving circuit, reference voltage drives
Dynamic circuit accelerates the rate of climb or decrease speed of the first gray scale reference voltages when the first gray scale reference voltages are transient state.Cause
This, can reduce the static power consumption of source electrode driver and not influence the running of source electrode driver.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (23)
1. a kind of source electrode driver, which is characterized in that including：
One gamma voltage producing circuit receives an internal reference voltage, to provide one first ash of corresponding one first display grayscale
Rank reference voltage；
One first voltage buffer, to receive first gray scale reference voltages, to provide a driving voltage；And
One reference voltage driving circuit couples between the gamma voltage producing circuit and the first voltage buffer, to accelerate
The rate of climb or decrease speed of first gray scale reference voltages.
2. source electrode driver according to claim 1, which is characterized in that further include a voltage-selected switch, voltage choosing
The input terminal for selecting switch receives first gray scale reference voltages provided from gamma voltage producing circuit, and the voltage
One output end of selecting switch provides first gray scale reference voltages to the first voltage buffer.
3. source electrode driver according to claim 2, which is characterized in that the reference voltage driving circuit couples gamma electricity
Press the input terminal of generation circuit and the voltage-selected switch.
4. source electrode driver according to claim 1, which is characterized in that the reference voltage driving circuit includes one second electricity
Compression buffer, input terminal receive a driving reference voltage, and output end couples first gray scale reference voltages.
5. source electrode driver according to claim 4, which is characterized in that further include a voltage drop detection circuit, to detect
One voltage quasi position of first gray scale reference voltages, to decide whether to start the second voltage buffer.
6. source electrode driver according to claim 4, which is characterized in that further include a data detection circuit, according to the source
The display data and the first display grayscale that driver receives decide whether to start the second voltage buffer, wherein when this
When the corresponding grayscale value of display data is identical to the first display grayscale, which starts reference voltage driving electricity
Road.
7. source electrode driver according to claim 4, which is characterized in that the second voltage buffer receives an outside control
Signal, to start according to the external control signal, and the external control signal enable to receive in the source electrode driver one
The corresponding grayscale value of display data is identical to the first display grayscale.
8. source electrode driver according to claim 1, which is characterized in that the reference voltage driving circuit includes one first brilliant
Body pipe, a first end of the first transistor receive a driving reference voltage, a second end of the first transistor couple this
One gray scale reference voltages.
9. source electrode driver according to claim 8, which is characterized in that it is interior that a control terminal of the first transistor receives this
Portion's reference voltage.
10. source electrode driver according to claim 8, which is characterized in that the control terminal coupling of the first transistor should
The first end of the first transistor.
11. source electrode driver according to claim 8, which is characterized in that the reference voltage driving circuit further includes an electricity
Computing circuit is pressed, receives an operation reference voltage and a control reference signal, and couple a control terminal of the first transistor, with
The first transistor is connected according to the control reference signal, the wherein control reference signal enables to receive in the source electrode driver
The corresponding grayscale value of one display data is identical to the first display grayscale.
12. source electrode driver according to claim 11, which is characterized in that the voltage operational circuit includes：
One first resistor couples between the operation reference voltage and the control terminal of the first transistor；And
One second resistance couples between the control terminal of the first transistor and the control reference signal.
13. source electrode driver according to claim 1, which is characterized in that the reference voltage driving circuit includes one or two poles
Pipe, between one driving reference voltage of coupling and first gray scale reference voltages.
14. source electrode driver according to claim 1, which is characterized in that the gamma voltage producing circuit includes：
One tertiary voltage buffer receives the internal reference voltage to generate a gamma reference voltage；And
One resistance string receives the gamma reference voltage, to provide after being divided to the gamma reference voltage comprising first ash
Multiple gray scale reference voltages of rank reference voltage.
15. a kind of driving circuit, which is characterized in that drive a display panel, including：
Time schedule controller, to provide a display data；
One gamma voltage producing circuit receives an internal reference voltage, to provide one first ash of corresponding one first display grayscale
Rank reference voltage；
One first voltage buffer, to receive first gray scale reference voltages, to provide a driving voltage；
One reference voltage driving circuit couples between the gamma voltage producing circuit and the first voltage buffer, to accelerate
The reply of first gray scale reference voltages or the change of its voltage quasi position；And
One voltage-selected switch, an input terminal of the voltage-selected switch is received to be somebody's turn to do from what gamma voltage producing circuit was provided
First gray scale reference voltages, and an output end of the voltage-selected switch provides first gray scale reference voltages to first electricity
The conducting of compression buffer, the wherein voltage-selected switch is identical to the first display grayscale in the corresponding grayscale value of the display data.
16. driving circuit according to claim 15, which is characterized in that the reference voltage driving circuit couples gamma electricity
Press the input terminal of generation circuit and the voltage-selected switch.
17. driving circuit according to claim 15, which is characterized in that the reference voltage driving circuit includes one second electricity
Compression buffer, input terminal receive a driving reference voltage, and output end couples first gray scale reference voltages.
18. driving circuit according to claim 17, which is characterized in that further include a voltage drop detection circuit, to detect
One voltage quasi position of first gray scale reference voltages, to decide whether to start the second voltage buffer.
19. driving circuit according to claim 17, which is characterized in that further include a data detection circuit, it is aobvious according to this
Registration evidence and the first display grayscale decide whether to start the second voltage buffer, wherein when the corresponding grayscale of the display data
When value is identical to the first display grayscale, which starts the reference voltage driving circuit.
20. driving circuit according to claim 15, which is characterized in that the reference voltage driving circuit includes one first brilliant
Body pipe, a first end of the first transistor receive a driving reference voltage, a second end of the first transistor couple this
One gray scale reference voltages.
21. driving circuit according to claim 20, which is characterized in that it is interior that a control terminal of the first transistor receives this
Portion's reference voltage.
22. driving circuit according to claim 15, which is characterized in that the reference voltage driving circuit includes one or two poles
Pipe, between one driving reference voltage of coupling and first gray scale reference voltages.
23. driving circuit according to claim 15, which is characterized in that the gamma voltage producing circuit includes：
One tertiary voltage buffer receives the internal reference voltage to generate a gamma reference voltage；And
One resistance string receives the gamma reference voltage, to provide after being divided to the gamma reference voltage comprising first ash
Multiple gray scale reference voltages of rank reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410524552.2A CN105575344B (en) | 2014-10-08 | 2014-10-08 | Source electrode driver, its operation method and its driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410524552.2A CN105575344B (en) | 2014-10-08 | 2014-10-08 | Source electrode driver, its operation method and its driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105575344A CN105575344A (en) | 2016-05-11 |
| CN105575344B true CN105575344B (en) | 2018-10-02 |
Family
ID=55885406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410524552.2A Active CN105575344B (en) | 2014-10-08 | 2014-10-08 | Source electrode driver, its operation method and its driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105575344B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106097991B (en) * | 2016-05-30 | 2018-08-07 | 深圳市华星光电技术有限公司 | The data drive circuit and driving method of liquid crystal display panel |
| US11276370B2 (en) * | 2019-03-07 | 2022-03-15 | Samsung Display Co., Ltd. | Gamma voltage generating circuit, source driver and display device including the same |
| US10872550B2 (en) * | 2019-03-27 | 2020-12-22 | Novatek Microelectronics Corp. | Display driver and displaying method for cascade application |
| CN111613184B (en) * | 2020-06-22 | 2021-10-08 | 京东方科技集团股份有限公司 | Source driving circuit and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200739487A (en) * | 2006-04-13 | 2007-10-16 | Novatek Microelectronics Corp | Thin film transistor liquid crystal display panel driving device and method thereof |
| TW200812250A (en) * | 2006-08-30 | 2008-03-01 | Novatek Microelectronics Corp | Overdrive digital-to-analog converter, source driver and method thereof |
| CN100409066C (en) * | 2003-07-30 | 2008-08-06 | 株式会社日立显示器 | Liquid crystal display device and an optimum gradation voltage setting apparatus thereof |
| CN101299324A (en) * | 2007-05-01 | 2008-11-05 | 乐金显示有限公司 | Data drive device and method for liquid crystal display device |
| CN101714337A (en) * | 2008-10-08 | 2010-05-26 | 承景科技股份有限公司 | Driving and accelerating system and method for dynamic gamma generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060044241A1 (en) * | 2004-08-31 | 2006-03-02 | Vast View Technology Inc. | Driving device for quickly changing the gray level of the liquid crystal display and its driving method |
-
2014
- 2014-10-08 CN CN201410524552.2A patent/CN105575344B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409066C (en) * | 2003-07-30 | 2008-08-06 | 株式会社日立显示器 | Liquid crystal display device and an optimum gradation voltage setting apparatus thereof |
| TW200739487A (en) * | 2006-04-13 | 2007-10-16 | Novatek Microelectronics Corp | Thin film transistor liquid crystal display panel driving device and method thereof |
| TW200812250A (en) * | 2006-08-30 | 2008-03-01 | Novatek Microelectronics Corp | Overdrive digital-to-analog converter, source driver and method thereof |
| CN101299324A (en) * | 2007-05-01 | 2008-11-05 | 乐金显示有限公司 | Data drive device and method for liquid crystal display device |
| CN101714337A (en) * | 2008-10-08 | 2010-05-26 | 承景科技股份有限公司 | Driving and accelerating system and method for dynamic gamma generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105575344A (en) | 2016-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10706767B2 (en) | Shift register unit circuit, driving method thereof, gate drive circuit and display device | |
| US9437324B2 (en) | Shift register unit, driving method thereof, shift register and display device | |
| US9583065B2 (en) | Gate driver and display device having the same | |
| US9767755B2 (en) | Scan driving circuit for oxide semiconductor thin film transistors | |
| US10311783B2 (en) | Pixel circuit, method for driving the same, display panel and display device | |
| KR101943235B1 (en) | Scan driving circuit for oxide semiconductor thin film transistor | |
| CN105575344B (en) | Source electrode driver, its operation method and its driving circuit | |
| KR102426106B1 (en) | Stage circuit and scan driver using the same | |
| KR20120065788A (en) | A shift register and a display apparatus | |
| JP2020517994A (en) | Scan drive circuit | |
| TWI460703B (en) | Driving circuit and driving method for display | |
| US9997119B2 (en) | Buffer circuit, panel module, and display driving method | |
| TW201003627A (en) | Discharge circuit and display device with the same | |
| KR102452523B1 (en) | Scan driver | |
| TWI543142B (en) | Source driver, operatoin method thereof and driving circuit using the same | |
| CN107068074B (en) | GOA circuit | |
| CN109617533B (en) | High response rate amplifier circuit and related clamping method | |
| US9357603B2 (en) | Driving method of light emitting diodes | |
| CN102903331B (en) | Silicon-based organic light-emitting diode pixel driving circuit | |
| TWI701657B (en) | Shift register and display device having the same | |
| US9543954B2 (en) | Driver circuit with device variation compensation and operation method thereof | |
| CN101938274B (en) | Integrated grid driving circuit | |
| US20180308407A1 (en) | Scanning driving circuit | |
| CN108417173B (en) | Display device | |
| CN108962142B (en) | Slew rate enhancement circuit and buffer using same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |