CN116013212B - LCD driving circuit and LCD driver - Google Patents
LCD driving circuit and LCD driver Download PDFInfo
- Publication number
- CN116013212B CN116013212B CN202310007272.3A CN202310007272A CN116013212B CN 116013212 B CN116013212 B CN 116013212B CN 202310007272 A CN202310007272 A CN 202310007272A CN 116013212 B CN116013212 B CN 116013212B
- Authority
- CN
- China
- Prior art keywords
- mos tube
- operational amplifier
- subunit
- power consumption
- low
- 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
- 239000000758 substrate Substances 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 2
- 101150090280 MOS1 gene Proteins 0.000 description 23
- 101100401568 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MIC10 gene Proteins 0.000 description 23
- 102100030393 G-patch domain and KOW motifs-containing protein Human genes 0.000 description 20
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 20
- 101100508768 Arabidopsis thaliana IMPA3 gene Proteins 0.000 description 19
- 101100478187 Arabidopsis thaliana MOS4 gene Proteins 0.000 description 18
- 101100134625 Arabidopsis thaliana NUP88 gene Proteins 0.000 description 16
- 101100262446 Arabidopsis thaliana UBA1 gene Proteins 0.000 description 15
- 230000003068 static effect Effects 0.000 description 15
- 101100461812 Arabidopsis thaliana NUP96 gene Proteins 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 230000001052 transient effect Effects 0.000 description 12
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 101001051799 Aedes aegypti Molybdenum cofactor sulfurase 3 Proteins 0.000 description 1
- 101000746134 Homo sapiens DNA endonuclease RBBP8 Proteins 0.000 description 1
- 101000969031 Homo sapiens Nuclear protein 1 Proteins 0.000 description 1
- 102100021133 Nuclear protein 1 Human genes 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention provides an LCD driving circuit and an LCD driver, wherein the LCD driving circuit comprises: the device comprises a low-power consumption reference current module, a low-power consumption resistor voltage dividing module and a low-power consumption voltage following module; the low-power consumption resistor voltage dividing module is connected with the low-power consumption voltage following module, and the low-power consumption voltage following module is connected with the low-power consumption reference current module and the LCD display screen; the low-power consumption reference current module transmits the generated reference current to the low-power consumption voltage following module; the low-power consumption resistor voltage dividing module divides external voltage generated by an external power supply and transmits the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module; the low-power consumption voltage following module transmits the first reference voltage and the second reference voltage to the LCD display screen so as to enable the LCD display screen to display. Compared with the existing capacitive LCD driving circuit and resistance type LCD driving circuit, the invention has lower cost.
Description
Technical Field
The present invention relates to the field of driving display technologies, and in particular, to an LCD driving circuit and an LCD driver.
Background
Currently, the backlight brightness of an LCD display depends on the current flowing through the LEDs of the backlight, so that the LCD display requires a constant source driver to supply voltage and current to the backlight.
The existing LCD driving circuit structure mainly comprises a capacitive LCD driving circuit and a resistive LCD driving circuit, but the capacitive LCD driving circuit needs an additional IO port and a plug-in capacitor, has high cost, and the resistive LCD driving circuit has the advantages of incapability of making very large resistance, incapability of making very small current, high circuit power consumption, needs to increase an operational amplifier, a switch, a clock control circuit and the like for real-time control in order to reduce the power consumption, has relatively complex circuit and large circuit area, and also increases the cost.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide an LCD driving circuit and an LCD driver, and aims to solve the technical problem that the cost of a capacitive LCD driving circuit and a resistive LCD driving circuit in the prior art is high.
To achieve the above object, the present invention proposes an LCD driving circuit including: the device comprises a low-power consumption reference current module, a low-power consumption resistor voltage dividing module and a low-power consumption voltage following module;
The low-power consumption resistor voltage division module is connected with the low-power consumption voltage following module, and the low-power consumption voltage following module is connected with the low-power consumption reference current module and the LCD display screen;
the low-power consumption reference current module is used for transmitting the generated reference current to the low-power consumption voltage following module;
The low-power consumption resistor voltage dividing module is used for dividing external voltage generated by an external power supply and transmitting the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module;
The low-power consumption voltage following module is used for transmitting the first reference voltage and the second reference voltage to the LCD display screen so as to enable the LCD display screen to display.
Optionally, the low power consumption resistor voltage division module includes: the first MOS tube, the second MOS tube and the third MOS tube;
The substrate of the first MOS tube is connected with the source electrode of the first MOS tube, the source electrode of the first MOS tube is connected with an external power supply, the grid electrode of the first MOS tube is connected with the drain electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the low-power-consumption voltage following module, the drain electrode of the first MOS tube is also connected with the source electrode of the second MOS tube, the substrate of the second MOS tube is connected with the source electrode of the second MOS tube, the grid electrode of the second MOS tube is connected with the drain electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the low-power-consumption voltage following module, the drain electrode of the second MOS tube is also connected with the source electrode of the third MOS tube, the substrate of the third MOS tube is connected with the source electrode of the third MOS tube, the grid electrode of the third MOS tube is connected with the drain electrode of the third MOS tube, and the drain electrode of the third MOS tube is grounded.
Optionally, the low power consumption voltage following module includes: a first voltage follower unit and a second voltage follower unit;
the first voltage following unit is respectively connected with the drain electrode of the first MOS tube, the low-power consumption reference current module and the LCD display screen, and the second voltage following unit is connected with the drain electrode of the second MOS tube, the low-power consumption reference current module and the LCD display screen;
the first voltage following unit is used for transmitting the first reference voltage to the LCD display screen;
the second voltage following unit is used for transmitting the second reference voltage to the LCD display screen.
Optionally, the first voltage follower unit includes: the first operational amplifier subunit, the first phase compensation subunit and the first driving output subunit;
the first operational amplifier subunit is respectively connected with the drain electrode of the first MOS tube, the low-power consumption reference current module, the first phase compensation subunit and the first driving output subunit, the first phase compensation subunit is connected with the first driving output subunit, and the first driving output subunit is connected with the LCD display screen;
the first operational amplifier subunit is configured to amplify the first reference voltage, and transmit the amplified first reference voltage to the first phase compensation subunit and the first driving output subunit;
The first phase compensation subunit is used for sampling and phase compensating the voltages in the first operational amplifier subunit and the first driving output subunit to obtain a compensated first reference voltage;
The first driving output subunit is used for stabilizing the compensated first reference voltage and transmitting the stabilized first reference voltage to the LCD display screen.
Optionally, the second voltage follower unit includes: the second operational amplifier subunit, the second phase compensation subunit and the second driving output subunit;
The second operational amplifier subunit is respectively connected with the drain electrode of the second MOS tube, the low-power consumption reference current module, the second phase compensation subunit and the second driving output subunit, the second phase compensation subunit is connected with the second driving output subunit, and the second driving output subunit is connected with the LCD display screen;
The second operational amplifier subunit is configured to amplify the second reference voltage, and transmit the amplified second reference voltage to the second phase compensation subunit and the second driving output subunit;
The second phase compensation subunit is configured to sample and phase compensate voltages in the second operational amplifier subunit and the second driving output subunit, so as to obtain a compensated second reference voltage;
the second driving output subunit is configured to stabilize the compensated second reference voltage, and transmit the stabilized second reference voltage to the LCD display screen.
Optionally, the first operational amplifier subunit includes: a first operational amplifier and a second operational amplifier;
The first pin of the first operational amplifier is connected with the low-power consumption reference current module, the third pin of the first operational amplifier is connected with the third pin of the second operational amplifier, the fourth pin of the first operational amplifier is connected with the fourth pin of the second operational amplifier, the fourth pin of the first operational amplifier is also connected with the drain electrode of the first MOS tube, the fifth pin of the first operational amplifier is also connected with the first phase compensation subunit, the fifth pin of the first operational amplifier is also connected with the first driving output subunit, the first pin of the second operational amplifier is connected with the low-power consumption reference current module, the third pin of the second operational amplifier is connected with the first driving output subunit, the fifth pin of the second operational amplifier is also connected with the first phase compensation subunit, and the fifth pin of the second operational amplifier is also connected with the first driving output subunit.
Optionally, the first drive output subunit includes: the MOS transistor comprises a fourth MOS transistor, a fifth MOS transistor, a first current source and a second current source;
The grid electrode of the fourth MOS tube is connected with a fifth pin of the first operational amplifier, the source electrode of the fourth MOS tube is connected with a substrate of the fourth MOS tube, the source electrode of the fourth MOS tube is connected with the low-power consumption reference current module, the source electrode of the fourth MOS tube is also connected with one end of the first current source, the other end of the first current source is connected with the first phase compensation subunit, the drain electrode of the fourth MOS tube is connected with one end of the first current source, which is close to the first phase compensation subunit, of the first current source, one end of the first current source, which is close to the first phase compensation subunit, is also connected with the drain electrode of the fifth MOS tube, the grid electrode of the fifth MOS tube is connected with the substrate of the fifth MOS tube, the source electrode of the fifth MOS tube is grounded, the source electrode of the fifth MOS tube is also connected with one end of the second current source, the other end of the fifth MOS tube is connected with the drain electrode of the fourth MOS tube, which is close to the fourth current source is connected with the fourth end of the fourth MOS tube, which is close to the fourth MOS tube is connected with the fourth end of the LCD.
Optionally, the second operational amplifier subunit includes: a third operational amplifier and a fourth operational amplifier;
The first pin of the third operational amplifier is connected with the low-power consumption reference current module, the third pin of the third operational amplifier is connected with the third pin of the fourth operational amplifier, the fourth pin of the third operational amplifier is connected with the fourth pin of the fourth operational amplifier, the fourth pin of the third operational amplifier is also connected with the drain electrode of the second MOS tube, the fifth pin of the third operational amplifier is also connected with the second phase compensation subunit, the fifth pin of the third operational amplifier is also connected with the second drive output subunit, the first pin of the fourth operational amplifier is connected with the low-power consumption reference current module, the third pin of the fourth operational amplifier is connected with the second drive output subunit, the fifth pin of the fourth operational amplifier is also connected with the second phase compensation subunit, and the fifth pin of the fourth operational amplifier is also connected with the second drive output subunit.
Optionally, the second driving output subunit includes: a sixth MOS tube, a seventh MOS tube, a third current source and a fourth current source;
The grid electrode of the sixth MOS tube is connected with a fifth pin of the third operational amplifier, the source electrode of the sixth MOS tube is connected with the substrate of the sixth MOS tube, the source electrode of the sixth MOS tube is connected with the low-power consumption reference current module, the source electrode of the sixth MOS tube is also connected with one end of the third current source, the other end of the third current source is connected with the second phase compensation subunit, the drain electrode of the sixth MOS tube is connected with one end of the third current source, which is close to the second phase compensation subunit, of the third current source, one end of the third current source, which is close to the second phase compensation subunit, is also connected with the drain electrode of the seventh MOS tube, the grid electrode of the seventh MOS tube is connected with the substrate of the seventh MOS tube, the source electrode of the seventh MOS tube is grounded, the source electrode of the seventh MOS tube is also connected with one end of the fourth current source, the other end of the sixth MOS tube is connected with the fourth current source, which is close to the fourth end of the fourth MOS tube is connected with the fourth end of the fourth MOS tube, which is close to the fourth end of the fourth MOS tube is connected with the fourth end of the LCD tube.
In order to achieve the above object, the present invention also proposes an LCD driver including the above LCD driving circuit.
The present invention provides an LCD driving circuit, comprising: the device comprises a low-power consumption reference current module, a low-power consumption resistor voltage dividing module and a low-power consumption voltage following module; the low-power consumption resistor voltage division module is connected with the low-power consumption voltage following module, and the low-power consumption voltage following module is connected with the low-power consumption reference current module and the LCD display screen; the low-power consumption reference current module is used for transmitting the generated reference current to the low-power consumption voltage following module; the low-power consumption resistor voltage dividing module is used for dividing external voltage generated by an external power supply and transmitting the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module; the low-power consumption voltage following module is used for transmitting the first reference voltage and the second reference voltage to the LCD display screen so as to enable the LCD display screen to display. Because the invention divides the external voltage generated by the external power supply through the low-power consumption resistor voltage dividing module, the first reference voltage and the second reference voltage are obtained for the display of the LCD display screen, and compared with the existing capacitive LCD driving circuit and resistive LCD driving circuit, the cost of the invention is lower.
Drawings
Fig. 1 is a block diagram of a first embodiment of an LCD driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an LCD driving circuit according to a first embodiment of the present invention;
FIG. 3 is a block diagram showing the structures of a first voltage follower unit and a second voltage follower unit in a second embodiment of an LCD driving circuit according to an embodiment of the present invention;
Fig. 4 is a schematic circuit diagram of a first voltage follower unit in a second embodiment of an LCD driving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a second voltage follower unit in a second embodiment of an LCD driving circuit according to an embodiment of the present invention;
fig. 6 is an input waveform diagram of an LCD driving circuit according to an embodiment of the present invention.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the described embodiments are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiments of the present invention, all directional indicators (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific gesture (as shown in the drawings), and if the specific gesture changes, the directional indicators correspondingly change.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, an adjustment defining "first", "second" may include at least one such feature, either explicitly or implicitly. In addition, the technical solutions of the embodiments may be combined with each other, but it must be based on the fact that those skilled in the art can implement the technical solutions, when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should still be considered to be absent, and the combination is not within the scope of protection claimed in the present invention.
Referring to fig. 1, fig. 1 is a block diagram illustrating a first embodiment of an LCD driving circuit according to an embodiment of the present invention.
As shown in fig. 1, the LCD driving circuit in this embodiment includes: the low-power consumption reference current module 1, the low-power consumption resistor voltage division module 2 and the low-power consumption voltage following module 3; the low-power consumption resistor voltage division module 2 is connected with the low-power consumption voltage following module 3, and the low-power consumption voltage following module 3 is connected with the low-power consumption reference current module 1 and an LCD display screen;
It should be noted that, the LCD driving circuit provided in this embodiment may be applied to a scene where an LCD display screen is driven to display, or other scenes where driving is required.
It is understood that the driving mode of the LCD display may be static driving, simple matrix driving or active matrix driving, which is not limited in this embodiment.
The low-power consumption reference current module 1 is used for transmitting the generated reference current to the low-power consumption voltage following module 3; the low-power consumption resistor voltage dividing module 2 is used for dividing an external voltage generated by an external power supply and transmitting the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module 3; the low-power consumption voltage following module 3 is configured to transmit the first reference voltage and the second reference voltage to the LCD display screen, so that the LCD display screen displays the first reference voltage and the second reference voltage.
It should be understood that the external power source may be an operating power source for supplying power to the LCD panel, and the voltage value of the external power source is not limited, and the first reference voltage and the second reference voltage may be constant voltages required for displaying on the LCD panel.
It should be noted that, the low-power consumption voltage following module 3 may play a role in buffering, isolating and improving the load capacity, and when the low-power consumption voltage following module 3 receives the reference current provided by the low-power consumption reference current module 1, the working point may be determined according to the reference current, so as to output a constant first reference voltage and a constant second reference voltage.
The low-power consumption reference current module 1 can provide reference current for the low-power consumption voltage following module 3, the low-power consumption resistor voltage dividing module 2 can divide the received external voltage and transmit the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module 3, and the low-power consumption voltage following module 3 transmits the first reference voltage and the second reference voltage to the LCD display screen to drive the LCD display screen for displaying, and because all the modules in the embodiment adopt the low-power consumption module, compared with the existing capacitive LCD driving circuit, the circuit driving port and external capacitance are reduced, and the application cost is obviously reduced; meanwhile, compared with the existing resistive LCD driving circuit, the resistive LCD driving circuit has lower power consumption and stronger driving capability, solves the problem that the power consumption and the driving capability are mutually restricted, has simple content circuit and reduces the design cost.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of an LCD driving circuit according to a first embodiment of the present invention;
As shown in fig. 2, the low power consumption resistor voltage dividing module 2 includes: the first MOS transistor MOS1, the second MOS transistor MOS2 and the third MOS transistor MOS3;
The substrate of the first MOS tube MOS1 is connected with the source of the first MOS tube MOS1, the source of the first MOS tube MOS1 is connected with an external power supply, the grid of the first MOS tube MOS1 is connected with the drain of the first MOS tube MOS1, the drain of the first MOS tube MOS1 is connected with the low-power voltage following module 3, the drain of the first MOS tube MOS1 is also connected with the source of the second MOS tube MOS2, the substrate of the second MOS tube MOS2 is connected with the source of the second MOS tube MOS2, the grid of the second MOS tube MOS2 is connected with the drain of the second MOS tube MOS2, the drain of the second MOS tube MOS2 is connected with the source of the third MOS tube MOS3, the substrate of the third MOS tube MOS3 is connected with the drain of the third MOS tube MOS3, and the drain of the third MOS tube MOS3 is connected with the drain of the third MOS tube MOS 3.
For ease of understanding, the external voltage generated by the external power supply is denoted as VLCD, and the reference currents are denoted as IB1 and IB2.
It can be understood that the first MOS transistor MOS1, the second MOS transistor MOS2, and the third MOS transistor MOS3 may be PMOS transistors, and these PMOS transistors have the same size and a small width to length ratio, and the drains and gates of the first MOS transistor MOS1, the second MOS transistor MOS2, and the third MOS transistor MOS3 are shorted, and the sources and the substrates are shorted, so that the resistance of the whole low-power resistor voltage division module 2 is very large, and may be at 60 mega ohm level.
Further, for convenience of explanation, the circuit in this embodiment takes 1/3bias as an example, at VLCD voltage, the low-power consumption reference current module 1 provides a low-power consumption current reference for the low-power consumption voltage follower module 3, the operating voltage range of VLCD may be 1.8V to 5.5V, the reference currents IB1 and IB2 may be 16nA to 20nA in the operating voltage range of VLCD, and the power consumption of the low-power consumption reference current module 1 itself may be 50nA.
It should be understood that, in this embodiment, since the low-power consumption resistor voltage dividing module 2 only adopts three PMOS transistors, the area can be made small while achieving a large resistance, and in combination with the above example, the on current of the three PMOS transistors can be at the level of 50nA in the VLCD operating voltage range, and the current of the PMOS transistors can be about 50nA to 200nA in the whole voltage operating range.
It should be emphasized that the drain of the first MOS transistor MOS1 may output the first reference voltage to the low power consumption voltage follower module 3, where the first reference voltage is denoted as VR1, vr1=2/3 VLCD, and the drain of the second MOS transistor MOS2 may output the second reference voltage to the low power consumption voltage follower module 3, where the second reference voltage is denoted as VR2, vr2=1/3 VLCD.
Meanwhile, the first MOS tube MOS1, the second MOS tube MOS2 and the third MOS tube MOS3 can be NMOS tubes, the NMOS tubes are connected into diodes to realize large resistance, the connection mode is that the grid electrode is short-circuited with the drain electrode, the substrate is grounded, and the effect of small area can be achieved.
It should be emphasized that the low-power resistive voltage divider module 2 may be implemented by other resistive modules in the process, such as Nwell resistance, poly high resistance, etc., which is not limited in this embodiment.
In a specific implementation, when the source electrode of the first MOS transistor MOS1 receives an external voltage, since the gate voltage of the first MOS transistor MOS1 is smaller than the source voltage, and then the first MOS transistor MOS1 is turned on, the drain electrode of the first MOS transistor MOS1 outputs a first reference voltage to the low-power consumption voltage following module 3, and likewise, the gate voltage of the second MOS transistor MOS2 is smaller than the source voltage, the second MOS transistor MOS2 is turned on, the drain electrode of the second MOS transistor MOS2 outputs a second reference voltage to the low-power consumption voltage following module 3, the gate voltage of the third MOS transistor MOS3 is also smaller than the source voltage, and the third MOS transistor MOS3 is turned on to be grounded, so that a large resistor can be realized through three PMOS transistors, and meanwhile, the area is smaller, and the cost is saved.
Further, as further shown in fig. 2, the low-power consumption voltage following module 3 includes: a first voltage follower unit 31 and a second voltage follower unit 32;
The first voltage following unit 31 is respectively connected with the drain electrode of the first MOS transistor MOS1, the low-power consumption reference current module 1 and the LCD display screen, and the second voltage following unit 32 is connected with the drain electrode of the second MOS transistor MOS2, the low-power consumption reference current module 1 and the LCD display screen;
It should be noted that, the first voltage follower unit 31 is configured to transmit the first reference voltage to the LCD display; the second voltage follower unit 32 is configured to transmit the second reference voltage to the LCD panel.
For convenience of explanation, the first reference voltage output from the first voltage follower unit 31 is denoted as V1, the second reference voltage output from the second voltage follower unit 32 is denoted as V2, and v1=2/3 VLCD and v2=1/3 VLCD are given by way of example as 1/3 bias.
In a specific implementation, the first voltage follower unit 31 transmits a first reference voltage to the LCD display, and the second voltage follower unit 32 transmits a second reference voltage to the LCD display.
In this embodiment, when the source electrode of the first MOS transistor MOS1 receives the external voltage, since the gate voltage of the first MOS transistor MOS1 is smaller than the source voltage, and thus the first MOS transistor MOS1 is turned on, the drain electrode of the first MOS transistor MOS1 outputs the first reference voltage to the first voltage follower unit 31, the first voltage follower unit 31 transmits the first reference voltage to the LCD display screen, and likewise the gate voltage of the second MOS transistor MOS2 is smaller than the source voltage, the second MOS transistor MOS2 is turned on, the drain electrode of the second MOS transistor MOS2 outputs the second reference voltage to the second voltage follower unit 32, the second voltage follower unit 32 transmits the second reference voltage to the LCD display screen, and the gate voltage of the third MOS transistor MOS3 is also smaller than the source voltage, and the third MOS transistor MOS3 is grounded, so that a large resistance can be realized through three PMOS transistors, and meanwhile, the area is smaller, and the cost is saved.
Referring to fig. 3, fig. 3 is a block diagram illustrating a structure of a first voltage follower unit 31 and a second voltage follower unit 32 in a second embodiment of an LCD driving circuit according to an embodiment of the present invention;
As shown in fig. 3, the first voltage follower unit 31 includes: a first operational amplifier subunit 311, a first phase compensation subunit 312, and a first drive output subunit 313;
The first operational amplifier subunit 311 is connected to the drain electrode of the first MOS transistor MOS1, the low-power consumption reference current module 1, the first phase compensation subunit 312, and the first driving output subunit 313, where the first phase compensation subunit 312 is connected to the first driving output subunit 313, and the first driving output subunit 313 is connected to the LCD display screen;
It should be noted that, the first op-amp subunit 311 is configured to amplify the first reference voltage and transmit the amplified first reference voltage to the first phase compensation subunit 312 and the first driving output subunit 313; the first phase compensation subunit 312 is configured to sample and phase compensate voltages in the first operational amplifier subunit 311 and the first driving output subunit 313, so as to obtain a compensated first reference voltage; the first driving output subunit 313 is configured to stabilize the compensated first reference voltage, so as to provide a large driving capability required by the LCD display screen, and transmit the stabilized first reference voltage to the LCD display screen.
Further, the second voltage follower unit 32 includes: a second operational amplifier subunit 321, a second phase compensation subunit 322, and a second drive output subunit 323;
The second operational amplifier subunit 321 is connected to the drain electrode of the second MOS transistor MOS2, the low-power consumption reference current module 1, the second phase compensation subunit 322, and the second driving output subunit 323, where the second phase compensation subunit 322 is connected to the second driving output subunit 323, and the second driving output subunit 323 is connected to the LCD display screen;
The second operational amplifier subunit 321 is configured to amplify the second reference voltage, and transmit the amplified second reference voltage to the second phase compensation subunit 322 and the second driving output subunit 323; the second phase compensation subunit 322 is configured to sample and phase compensate voltages in the second op-amp subunit 321 and the second driving output subunit 323, so as to obtain a compensated second reference voltage; the second driving output subunit 323 is configured to stabilize the compensated second reference voltage, so as to provide a large driving capability required by the LCD display screen, and transmit the stabilized second reference voltage to the LCD display screen.
It is understood that the first phase compensation subunit 312 may perform phase compensation on the entire first voltage follower unit 31, and the second phase compensation subunit 322 may perform phase compensation on the entire second voltage follower unit 32, so as to ensure that the first operational amplifier subunit 311 and the second operational amplifier subunit 321 can be kept stable in any situation.
It should be understood that the first driving output subunit 313 and the second driving output subunit 323 may stabilize the received compensated first reference voltage and the second reference voltage to the configuration values for outputting, and the specific size of the configuration values may be set according to the actual situation, which is not limited in this embodiment.
In this embodiment, the first operational amplifier subunit 311 amplifies the first reference voltage, the first phase compensation subunit 312 samples and phase compensates the voltages in the first operational amplifier subunit 311 and the first driving output subunit 313, and the first compensated reference voltage is stabilized to a configuration value by the first driving output subunit 313, so as to obtain a stabilized first reference voltage, so as to ensure stable display of the LCD display screen, and the second operational amplifier subunit 321 amplifies the second reference voltage, and the second phase compensation subunit 322 samples and phase compensates the voltages in the second operational amplifier subunit 321 and the second driving output subunit 323, and the second compensated reference voltage is stabilized to the configuration value by the second driving output subunit 323, so as to obtain a stabilized second reference voltage, so as to ensure stable display of the LCD display screen.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a first voltage follower unit 31 in a second embodiment of an LCD driving circuit according to an embodiment of the present invention;
as shown in fig. 4, the first op amp subunit 311 includes: a first operational amplifier OP1 and a second operational amplifier OP2;
The first pin of the first operational amplifier OP1 is connected with the low-power consumption reference current module 1, the third pin of the first operational amplifier OP1 is connected with the third pin of the second operational amplifier OP2, the fourth pin of the first operational amplifier OP1 is connected with the fourth pin of the second operational amplifier OP2, the fourth pin of the first operational amplifier OP1 is further connected with the drain electrode of the first MOS transistor MOS1, the fifth pin of the first operational amplifier OP1 is further connected with the first phase compensation subunit 312, the fifth pin of the first operational amplifier OP1 is further connected with the first driving output subunit 313, the first pin of the second operational amplifier OP2 is connected with the low-power consumption reference current module 1, the third pin of the second operational amplifier OP2 is connected with the first driving output subunit 313, the fifth pin of the second operational amplifier OP2 is further connected with the first phase compensation subunit 312, and the fifth pin of the second operational amplifier OP2 is further connected with the first driving output subunit 313.
The first operational amplifier OP1 may be an NMOS differential pair single-stage operational amplifier, and the second operational amplifier OP2 may be a PMOS differential pair single-stage operational amplifier.
It is understood that the first pin of the first operational amplifier OP1 and the first pin of the second operational amplifier OP2 receive the reference current, and in this embodiment, the static power consumption of the first voltage follower unit 31 and the second voltage follower unit 32 may be 288nA, where the first operational amplifier OP1 and the second operational amplifier OP2 may be 72nA.
It should be emphasized that the first phase compensation subunit 312 may be any unit for performing phase compensation, and the specific components are not limited in this embodiment.
In a specific implementation, the fourth pin of the first operational amplifier OP1 and the fourth pin of the second operational amplifier OP2 receive the first reference voltage, amplify the first reference voltage, and transmit the amplified first reference voltage from the fifth pin of the first operational amplifier OP1 and the fifth pin of the second operational amplifier OP2 to the first phase compensation subunit 312 and the first driving output subunit 313, where the first phase compensation subunit 312 samples and phase compensates the first reference voltage output by the first phase compensation subunit.
Further, the first driving output subunit 313 includes: the MOS transistor comprises a fourth MOS transistor MOS4, a fifth MOS transistor MOS5, a first current source I1 and a second current source I2;
Wherein the grid electrode of the fourth MOS tube MOS4 is connected with the fifth pin of the first operational amplifier OP1, the source electrode of the fourth MOS tube MOS4 is connected with the substrate of the fourth MOS tube MOS4, the source electrode of the fourth MOS tube MOS4 is connected with the low-power consumption reference current module 1, the source electrode of the fourth MOS tube MOS4 is also connected with one end of the first current source I1, the other end of the first current source I1 is connected with the first phase compensation subunit 312, the drain electrode of the fourth MOS tube MOS4 is connected with one end of the first current source I1 close to the first phase compensation subunit 312, one end of the first current source I1 close to the first phase compensation subunit 312 is also connected with the drain electrode of the fifth MOS tube MOS5, the grid of fifth MOS pipe MOS5 with the fifth pin of second operational amplifier OP2 is connected, the source of fifth MOS pipe MOS5 with the substrate of fifth MOS pipe MOS5 is connected, the source ground of fifth MOS pipe MOS5, the source of fifth MOS pipe MOS5 still with the one end of second current source I2 is connected, the other end of second current source I2 with the drain electrode of fourth MOS pipe MOS4 is connected, the one end that second current source I2 is close to fourth MOS pipe MOS4 with the third pin of second operational amplifier OP2 is connected, the one end that second current source I2 is close to fourth MOS pipe MOS4 still with LCD display screen is connected.
It should be noted that, the fourth MOS transistor MOS4 may be a PMOS transistor, the fifth MOS transistor MOS5 may be an NMOS transistor, the fourth MOS transistor MOS4 is driven by the output of the first operational amplifier OP1, the fifth MOS transistor MOS5 is driven by the output of the second operational amplifier OP2, and the fourth MOS transistor MOS4 and the fifth MOS transistor MOS5 may be used to provide a transient strong driving current.
It will be appreciated that the first current source I1 and the second current source I2 are used to determine the quiescent current of the first drive output subunit 313.
In this embodiment, the existing common voltage follower is required to provide a strong pull-up current capability and a pull-down current capability at the same time, and meanwhile, the power consumption of the voltage follower is higher, but the static power consumption of the first voltage follower unit 31 provided in this embodiment is lower, and the fourth MOS transistor MOS4 and the fifth MOS transistor MOS5 are opened only when the strong driving capability is required to be provided to provide a transient large current, and after the first reference voltage is stabilized, the transient large current disappears, and the first current source I1 and the second current source I2 are used for rapidly stabilizing the static operation, and the static power consumption is lower.
Further, referring to fig. 5, fig. 5 is a schematic circuit diagram of a second voltage follower unit 32 in a second embodiment of the LCD driving circuit according to the present invention;
As shown in fig. 5, the second op-amp subunit 321 includes: a third operational amplifier OP3 and a fourth operational amplifier OP4;
The first pin of the third operational amplifier OP3 is connected to the low-power consumption reference current module 1, the third pin of the third operational amplifier OP3 is connected to the third pin of the fourth operational amplifier OP4, the fourth pin of the third operational amplifier OP3 is connected to the fourth pin of the fourth operational amplifier OP4, the fourth pin of the third operational amplifier OP3 is further connected to the drain of the second MOS transistor MOS2, the fifth pin of the third operational amplifier OP3 is further connected to the second phase compensation subunit 322, the fifth pin of the third operational amplifier OP3 is further connected to the second driving output subunit 323, the first pin of the fourth operational amplifier OP4 is connected to the low-power consumption reference current module 1, the third pin of the fourth operational amplifier OP4 is connected to the second driving output subunit 323, the fifth pin of the fourth operational amplifier OP4 is further connected to the fourth phase compensation subunit 322, and the fourth operational amplifier OP4 is further connected to the fifth driving output subunit 323.
The third operational amplifier OP3 may be an NMOS differential pair single-stage operational amplifier, and the fourth operational amplifier OP4 may be a PMOS differential pair single-stage operational amplifier.
It is understood that the first pin of the third operational amplifier OP3 and the first pin of the fourth operational amplifier OP4 receive the reference current, and in this embodiment, the static power consumption of the first voltage follower unit 31 and the second voltage follower unit 32 may be 288nA, where the third operational amplifier OP3 and the fourth operational amplifier OP4 may be 72nA.
It should be emphasized that the second phase compensation subunit 322 may be any unit for performing phase compensation, and the specific components are not limited in this embodiment.
In a specific implementation, the fourth pin of the third operational amplifier OP3 and the fourth pin of the fourth operational amplifier OP4 receive the second reference voltage, amplify the second reference voltage, and transmit the amplified second reference voltage from the fifth pin of the third operational amplifier OP3 and the fifth pin of the fourth operational amplifier OP4 to the second phase compensation subunit 322 and the second driving output subunit 323, where the second phase compensation subunit 322 samples and phase compensates the second reference voltage output by the second phase compensation subunit.
Further, the second driving output subunit 323 includes: a sixth MOS transistor MOS6, a seventh MOS transistor MOS7, a third current source I3 and a fourth current source I4;
Wherein the grid electrode of the sixth MOS tube MOS6 is connected with the fifth pin of the third operational amplifier OP3, the source electrode of the sixth MOS tube MOS6 is connected with the substrate of the sixth MOS tube MOS6, the source electrode of the sixth MOS tube MOS6 is connected with the low-power consumption reference current module 1, the source electrode of the sixth MOS tube MOS6 is also connected with one end of the third current source I3, the other end of the third current source I3 is connected with the second phase compensation subunit 322, the drain electrode of the sixth MOS tube MOS6 is connected with one end of the third current source I3 close to the second phase compensation subunit 322, one end of the third current source I3 close to the second phase compensation subunit 322 is also connected with the drain electrode of the seventh MOS tube MOS7, the grid electrode of the seventh MOS tube MOS7 is connected with the fifth pin of the fourth operational amplifier OP4, the source electrode of the seventh MOS tube MOS7 is connected with the substrate of the seventh MOS tube MOS7, the source electrode of the seventh MOS tube MOS7 is grounded, the source electrode of the seventh MOS tube MOS7 is also connected with one end of the fourth current source I4, the other end of the fourth current source I4 is connected with the drain electrode of the sixth MOS tube MOS6, one end of the fourth current source I4, which is close to the sixth MOS tube MOS6, is connected with the third pin of the fourth operational amplifier OP4, and one end of the fourth current source I4, which is close to the sixth MOS tube MOS6, is also connected with the LCD display screen.
It should be noted that, the sixth MOS transistor MOS6 may be a PMOS transistor, the seventh MOS transistor MOS7 may be an NMOS transistor, the sixth MOS transistor MOS6 is driven by the output of the third operational amplifier OP3, the seventh MOS transistor MOS7 is driven by the output of the fourth operational amplifier OP4, and the sixth MOS transistor MOS6 and the seventh MOS transistor MOS7 may be used to provide a transient strong driving current.
It will be appreciated that the third current source I3 and the fourth current source I4 are used to determine the quiescent current of the second drive output subunit 323.
In this embodiment, the existing common voltage follower is required to provide a strong pull-up current capability and a pull-down current capability at the same time, and meanwhile, the power consumption of the voltage follower is relatively high, but the static power consumption of the second voltage follower unit 32 provided in this embodiment is relatively low, and the sixth MOS transistor MOS6 and the seventh MOS transistor MOS7 are opened only when the strong driving capability is required to be provided to provide a transient large current, and after the second reference voltage is stabilized, the transient large current disappears, and the voltage is quickly stabilized in a static state by the third current source I3 and the fourth current source I4, so that the static power consumption is relatively low.
It should be noted that, in the present embodiment, the static power consumption of the first driving output subunit 313 and the second driving output subunit 323 may be 144nA, and further two voltage follower units are required at 1/3bias, and the static power consumption of the low power consumption voltage follower module 3 is 576nA.
When the driving is performed for a certain period of time and in a stable state, the static power consumption of the low-power consumption voltage following module 3 can be 576nA at this moment, when the level of the LCD driving port is switched, the first voltage following unit 31 detects the level change through the first operational amplifier OP1 and the second operational amplifier OP2, controls the fourth MOS transistor MOS4 or the fifth MOS transistor MOS5 to provide transient high current, quickly pulls up or down the first reference voltage to a configuration value, then automatically restores to the basic current in the static operation due to the negative feedback characteristic of the operational amplifier, and simultaneously, the second voltage following unit 32 controls the sixth MOS transistor MOS6 or the seventh MOS transistor MOS7 to provide transient high current through the third operational amplifier OP3 and the fourth operational amplifier OP4, quickly pulls up or pulls down the second reference voltage to the configuration value, and then automatically restores to the basic current in the static operation due to the negative feedback characteristic of the operational amplifier.
The specific flow of the first voltage following unit is as follows: if V1 in fig. 4 becomes low, at this time, INN of the first operational amplifier OP1 and the second operational amplifier OP2 becomes low, and then the fifth pin output of the second operational amplifier OP2 becomes low, the gate voltage of the fifth operational amplifier OP 5 becomes low, the driving capability of the fifth MOS transistor MOS5 decreases, the pull-down current decreases, and at the same time, the fifth pin output of the first operational amplifier OP1 becomes low, the gate voltage of the fourth MOS transistor MOS4 becomes low, the driving capability of the fourth MOS transistor MOS4 becomes high, the pull-up current becomes high, and then V1 is rapidly pulled up by the fourth MOS transistor MOS4, that is, V1 is rapidly pulled back to the original value because of the feedback loop, so as to ensure that the level of the output first reference voltage is stable, and when V1 becomes high, at this time, the INN of the first operational amplifier OP1 and the second operational amplifier OP2 becomes high, and then the fifth pin output of the second operational amplifier OP2 becomes high, the gate voltage of the fifth MOS transistor MOS5 becomes high, the driving capability of the fifth MOS transistor MOS5 increases, the gate voltage of the pull-down current increases, and at the same time, the fourth voltage of the fourth operational amplifier OP1 is rapidly pulled back to the original value because the fourth pin output V1 is rapidly pulled back to the high, and the fourth voltage is rapidly pulled down by the fourth voltage, thereby ensuring that V1 is rapidly pulled up by the fourth voltage.
The specific flow of the second voltage following unit is as follows: if V2 in fig. 5 becomes low, at this time, INN of the third operational amplifier OP3 and the fourth operational amplifier OP4 becomes low, and then the fifth pin output of the fourth operational amplifier OP4 becomes low, the gate voltage of the seventh operational amplifier OP3 becomes low, the driving capability of the seventh MOS transistor MOS7 becomes weak, the pull-down current decreases, and at the same time, the fifth pin output of the third operational amplifier OP3 becomes low, the gate voltage of the sixth MOS transistor MOS6 becomes low, the driving capability of the sixth MOS transistor MOS6 becomes strong, the pull-up current becomes large, and then V2 is rapidly pulled up by the sixth MOS transistor MOS6, that is, V2 is rapidly pulled back to the original value because of the feedback loop, so as to ensure that the level of the output second reference voltage is stable, and when V2 becomes high, at this time, the fifth pin output of the third operational amplifier OP3 and the fourth operational amplifier OP4 becomes high, the gate voltage of the seventh MOS transistor MOS7 becomes high, the driving capability of the seventh MOS transistor MOS7 becomes high, the capability of the pull-down current increases, and at the same time, the driving capability of the sixth MOS transistor MOS7 becomes high, the pull-down current increases, and the voltage of the sixth MOS transistor MOS6 is rapidly pulled back because the fifth pin output of the V2 becomes high, and the sixth voltage is rapidly pulled back by the sixth voltage, which is rapidly pulled down by the voltage of the fifth pin, and V6 is rapidly pulled.
Further, in order to verify that the power consumption is low, referring to fig. 6, fig. 6 is an input waveform diagram of the LCD driving circuit according to the embodiment of the present invention.
As shown in fig. 6, the waveforms are 1/4duty (duty ratio), 1/3bias (bias), four COM and two SEG scan driving are adopted, and the waveforms are respectively COM1, COM2, COM3, COM4, SEG (1000) and SEG (0000), the output ends of the first voltage follower unit 31 and the second voltage follower unit 32 quickly provide large transient current for level switching at the falling edge or the rising edge in fig. 6, the maximum of the transient current can reach 150uA (which can be designed according to actual requirements), then the transient current is quickly reduced to 288nA with static power consumption, the whole switching time of the transient current from 288uA to 150uA to 288nA is about 30us, the level switching time is very short compared with the level holding time, each level holding time can be 1150us or even longer, the first voltage follower unit 31 and the second voltage follower unit 32 recover to a low power consumption state (the single voltage follower unit is around 288), the whole circuit is quickly switched, the whole switching of the level is ensured, the whole switching of the level is not required to be required, and the whole switching of the level is automatically controlled by the clock 3 nA, and the whole logic circuit is controlled by only has no need of the whole clock and has 3 nA and has an independent power consumption.
In this embodiment, the first operational amplifier subunit 311, the first phase compensation subunit 312 and the first driving output subunit 313 are used to realize stable output of the first reference voltage, and the second operational amplifier subunit 321, the second phase compensation subunit 322 and the second driving output subunit 323 are used to realize stable output of the second reference voltage, so that the whole level switching process is independently completed, thereby not only reducing the cost, but also reducing the power consumption.
In addition, in order to achieve the above objective, the embodiments of the present invention further provide an LCD driver, which includes the above LCD driving circuit, and in this embodiment, the structure of the above LCD driving circuit may refer to the above embodiments, and will not be described herein.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (3)
1. An LCD driving circuit, comprising: the device comprises a low-power consumption reference current module, a low-power consumption resistor voltage dividing module and a low-power consumption voltage following module;
The low-power consumption resistor voltage division module is connected with the low-power consumption voltage following module, and the low-power consumption voltage following module is connected with the low-power consumption reference current module and the LCD display screen;
the low-power consumption reference current module is used for transmitting the generated reference current to the low-power consumption voltage following module;
The low-power consumption resistor voltage dividing module is used for dividing external voltage generated by an external power supply and transmitting the obtained first reference voltage and second reference voltage to the low-power consumption voltage following module;
the low-power consumption voltage following module is used for transmitting the first reference voltage and the second reference voltage to the LCD display screen so as to enable the LCD display screen to display;
the low power consumption voltage following module includes: a first voltage follower unit and a second voltage follower unit;
The first voltage following unit is respectively connected with the low-power consumption resistance voltage dividing module, the low-power consumption reference current module and the LCD display screen, and the second voltage following unit is connected with the low-power consumption resistance voltage dividing module, the low-power consumption reference current module and the LCD display screen;
the first voltage following unit is used for transmitting the first reference voltage to the LCD display screen;
The second voltage following unit is used for transmitting the second reference voltage to the LCD display screen;
The first voltage follower unit includes: the first operational amplifier subunit, the first phase compensation subunit and the first driving output subunit;
The first operational amplifier subunit is respectively connected with the low-power consumption resistor voltage division module, the low-power consumption reference current module, the first phase compensation subunit and the first driving output subunit, the first phase compensation subunit is connected with the first driving output subunit, and the first driving output subunit is connected with the LCD display screen;
the first operational amplifier subunit is configured to amplify the first reference voltage, and transmit the amplified first reference voltage to the first phase compensation subunit and the first driving output subunit;
The first phase compensation subunit is used for sampling and phase compensating the voltages in the first operational amplifier subunit and the first driving output subunit to obtain a compensated first reference voltage;
The first driving output subunit is used for stabilizing the compensated first reference voltage and transmitting the stabilized first reference voltage to the LCD display screen;
The second voltage follower unit includes: the second operational amplifier subunit, the second phase compensation subunit and the second driving output subunit;
The second operational amplifier subunit is respectively connected with the low-power consumption resistor voltage division module, the low-power consumption reference current module, the second phase compensation subunit and the second driving output subunit, the second phase compensation subunit is connected with the second driving output subunit, and the second driving output subunit is connected with the LCD display screen;
The second operational amplifier subunit is configured to amplify the second reference voltage, and transmit the amplified second reference voltage to the second phase compensation subunit and the second driving output subunit;
The second phase compensation subunit is configured to sample and phase compensate voltages in the second operational amplifier subunit and the second driving output subunit, so as to obtain a compensated second reference voltage;
the second driving output subunit is used for stabilizing the compensated second reference voltage and transmitting the stabilized second reference voltage to the LCD display screen;
the first operational amplifier subunit includes: a first operational amplifier and a second operational amplifier;
The first pin of the first operational amplifier is connected with the low-power consumption reference current module, the third pin of the first operational amplifier is connected with the third pin of the second operational amplifier, the fourth pin of the first operational amplifier is connected with the fourth pin of the second operational amplifier, the fourth pin of the first operational amplifier is also connected with the low-power consumption resistor voltage division module, the fifth pin of the first operational amplifier is also connected with the first phase compensation subunit, the fifth pin of the first operational amplifier is also connected with the first driving output subunit, the first pin of the second operational amplifier is connected with the low-power consumption reference current module, the third pin of the second operational amplifier is connected with the first driving output subunit, the fifth pin of the second operational amplifier is also connected with the first phase compensation subunit, and the fifth pin of the second operational amplifier is also connected with the first driving output subunit;
the first drive output subunit includes: the MOS transistor comprises a fourth MOS transistor, a fifth MOS transistor, a first current source and a second current source;
The grid electrode of the fourth MOS tube is connected with a fifth pin of the first operational amplifier, the source electrode of the fourth MOS tube is connected with a substrate of the fourth MOS tube, the source electrode of the fourth MOS tube is connected with the low-power consumption reference current module, the source electrode of the fourth MOS tube is also connected with one end of the first current source, the other end of the first current source is connected with the first phase compensation subunit, the drain electrode of the fourth MOS tube is connected with one end of the first current source, which is close to the first phase compensation subunit, of the first current source, one end of the first current source, which is close to the first phase compensation subunit, is also connected with the drain electrode of the fifth MOS tube, the grid electrode of the fifth MOS tube is connected with the fifth pin of the second operational amplifier, the source electrode of the fifth MOS tube is connected with the substrate of the fifth MOS tube, the source electrode of the fifth MOS tube is grounded, the source electrode of the fifth MOS tube is also connected with one end of the second current source, the other end of the fifth MOS tube is connected with one end of the second current source, the other end of the fourth MOS tube is connected with the fourth MOS tube, which is close to the fourth pin of the fourth MOS tube is connected with the fourth end of the fourth MOS tube, which is connected with the fourth LCD;
the second operational amplifier subunit includes: a third operational amplifier and a fourth operational amplifier;
The first pin of the third operational amplifier is connected with the low-power consumption reference current module, the third pin of the third operational amplifier is connected with the third pin of the fourth operational amplifier, the fourth pin of the third operational amplifier is connected with the fourth pin of the fourth operational amplifier, the fourth pin of the third operational amplifier is also connected with the low-power consumption resistor voltage division module, the fifth pin of the third operational amplifier is connected with the second phase compensation subunit, the fifth pin of the third operational amplifier is also connected with the second drive output subunit, the first pin of the fourth operational amplifier is connected with the low-power consumption reference current module, the third pin of the fourth operational amplifier is connected with the second drive output subunit, the fifth pin of the fourth operational amplifier is connected with the second phase compensation subunit, and the fifth pin of the fourth operational amplifier is also connected with the second drive output subunit;
the second drive output subunit includes: a sixth MOS tube, a seventh MOS tube, a third current source and a fourth current source;
The grid electrode of the sixth MOS tube is connected with a fifth pin of the third operational amplifier, the source electrode of the sixth MOS tube is connected with the substrate of the sixth MOS tube, the source electrode of the sixth MOS tube is connected with the low-power consumption reference current module, the source electrode of the sixth MOS tube is also connected with one end of the third current source, the other end of the third current source is connected with the second phase compensation subunit, the drain electrode of the sixth MOS tube is connected with one end of the third current source, which is close to the second phase compensation subunit, of the third current source, one end of the third current source, which is close to the second phase compensation subunit, is also connected with the drain electrode of the seventh MOS tube, the grid electrode of the seventh MOS tube is connected with the substrate of the seventh MOS tube, the source electrode of the seventh MOS tube is grounded, the source electrode of the seventh MOS tube is also connected with one end of the fourth current source, the other end of the sixth MOS tube is connected with the fourth current source, which is close to the fourth end of the fourth MOS tube is connected with the fourth end of the fourth MOS tube, which is close to the fourth end of the fourth MOS tube is connected with the fourth end of the LCD tube.
2. The LCD driving circuit according to claim 1, wherein the low power consumption resistive voltage dividing module comprises: the first MOS tube, the second MOS tube and the third MOS tube;
The substrate of the first MOS tube is connected with the source electrode of the first MOS tube, the source electrode of the first MOS tube is connected with an external power supply, the grid electrode of the first MOS tube is connected with the drain electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the low-power-consumption voltage following module, the drain electrode of the first MOS tube is also connected with the source electrode of the second MOS tube, the substrate of the second MOS tube is connected with the source electrode of the second MOS tube, the grid electrode of the second MOS tube is connected with the drain electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the low-power-consumption voltage following module, the drain electrode of the second MOS tube is also connected with the source electrode of the third MOS tube, the substrate of the third MOS tube is connected with the source electrode of the third MOS tube, the grid electrode of the third MOS tube is connected with the drain electrode of the third MOS tube, and the drain electrode of the third MOS tube is grounded.
3. An LCD driver, characterized in that the LCD driver comprises the LCD driving circuit of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310007272.3A CN116013212B (en) | 2023-01-04 | 2023-01-04 | LCD driving circuit and LCD driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310007272.3A CN116013212B (en) | 2023-01-04 | 2023-01-04 | LCD driving circuit and LCD driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116013212A CN116013212A (en) | 2023-04-25 |
| CN116013212B true CN116013212B (en) | 2024-05-03 |
Family
ID=86035205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310007272.3A Active CN116013212B (en) | 2023-01-04 | 2023-01-04 | LCD driving circuit and LCD driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116013212B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060043644A (en) * | 2004-03-16 | 2006-05-15 | 마츠시타 덴끼 산교 가부시키가이샤 | Driving voltage control device |
| CN101025895A (en) * | 2006-02-20 | 2007-08-29 | 天利半导体（深圳）有限公司 | Driving circuit |
| JP2007286526A (en) * | 2006-04-20 | 2007-11-01 | Nec Electronics Corp | Display device and drive circuit of the display device |
| CN205081677U (en) * | 2015-10-10 | 2016-03-09 | 上海灿瑞科技股份有限公司 | Go up electric zero clearing and under -voltage locking starting circuit |
| CN214152410U (en) * | 2021-01-15 | 2021-09-07 | 晟矽微电子(南京)有限公司 | Driving device, driving chip and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008015875A (en) * | 2006-07-07 | 2008-01-24 | Matsushita Electric Ind Co Ltd | Power supply circuit |
-
2023
- 2023-01-04 CN CN202310007272.3A patent/CN116013212B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060043644A (en) * | 2004-03-16 | 2006-05-15 | 마츠시타 덴끼 산교 가부시키가이샤 | Driving voltage control device |
| CN101025895A (en) * | 2006-02-20 | 2007-08-29 | 天利半导体（深圳）有限公司 | Driving circuit |
| JP2007286526A (en) * | 2006-04-20 | 2007-11-01 | Nec Electronics Corp | Display device and drive circuit of the display device |
| CN205081677U (en) * | 2015-10-10 | 2016-03-09 | 上海灿瑞科技股份有限公司 | Go up electric zero clearing and under -voltage locking starting circuit |
| CN214152410U (en) * | 2021-01-15 | 2021-09-07 | 晟矽微电子(南京)有限公司 | Driving device, driving chip and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116013212A (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100365037B1 (en) | Voltage level shifter and display device | |
| US9692374B2 (en) | Differential amplifier circuit and display drive circuit | |
| US5777515A (en) | Operational amplifier apparatus | |
| KR100717278B1 (en) | Source driver capable of controlling slew rate | |
| US10964286B2 (en) | Voltage providing circuit, gate driving signal providing module, gate driving signal compensation method and display panel | |
| US7057459B2 (en) | Semiconductor integrated circuit | |
| US6366163B2 (en) | Video preamplifier | |
| US6897726B2 (en) | Differential circuit, amplifier circuit, and display device using the amplifier circuit | |
| US7176910B2 (en) | Driving circuit for display device | |
| US11482148B2 (en) | Power supply time sequence control circuit and control method thereof, display driver circuit, and display device | |
| US8493051B2 (en) | Fast-settling precision voltage follower circuit and method | |
| US20100097142A1 (en) | Driving circuit system and method of elevating slew rate of operational amplifier | |
| US8466908B2 (en) | Display device having a bias control unit for dynamically biasing a buffer and method thereof | |
| CN101178883A (en) | Data driver and display device | |
| JP3482908B2 (en) | Drive circuit, drive circuit system, bias circuit, and drive circuit device | |
| US11663970B2 (en) | Display device, CMOS operational amplifier, and driving method of display device | |
| CN101388201A (en) | Voltage generation circuit | |
| CN102098013B (en) | Difference amplifier and control method thereof | |
| EP1955437B1 (en) | Small signal amplifier with large signal output boost stage | |
| CN100454362C (en) | Driving circuit for display device | |
| CN116013212B (en) | LCD driving circuit and LCD driver | |
| CN110728961A (en) | Delay control circuit and control method on liquid crystal display | |
| CN107707245B (en) | Level shift circuit, display device driving circuit, and display device | |
| US6483384B1 (en) | High speed amplifier | |
| US10284183B2 (en) | Slew rate enhancement circuit and buffer using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240403 Address after: 410000 Room 201, building C12, Jinrong Wangcheng science and Technology Industrial Park, No. 858, Purui West Road, Wangcheng economic and Technological Development Zone, Changsha City, Hunan Province Applicant after: Hunan xinyide Technology Co.,Ltd. Country or region after: China Address before: 518000 No. a412, 4th floor, block a, Shenzhen famous industrial products exhibition and procurement center, Baoyuan Road, Xixiang street, Bao'an District, Shenzhen, Guangdong Applicant before: SHENZHEN SOLIDIC TECHNOLOGY CO.,LTD. Country or region before: China |
|
| GR01 | Patent grant |