CN114743516B - Compensation circuit and liquid crystal display device - Google Patents
Compensation circuit and liquid crystal display device Download PDFInfo
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- CN114743516B CN114743516B CN202210375338.XA CN202210375338A CN114743516B CN 114743516 B CN114743516 B CN 114743516B CN 202210375338 A CN202210375338 A CN 202210375338A CN 114743516 B CN114743516 B CN 114743516B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims description 21
- 239000010409 thin film Substances 0.000 claims description 13
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a compensation circuit and a liquid crystal display device, wherein the compensation circuit is used for: receiving a pixel voltage signal and a first common electrode voltage signal corresponding to a target pixel point; and generating a second common electrode voltage signal based on the pixel voltage signal and the first common electrode voltage signal, so that the peak-to-peak value of the second voltage difference signal is smaller than the peak-to-peak value of the first voltage difference signal, wherein the first voltage difference signal is a difference signal between the first common electrode voltage signal and the pixel voltage signal, and the second voltage difference signal is a difference signal between the second common electrode voltage signal and the pixel voltage signal. Based on the above mode, the brightness stability of the liquid crystal display picture can be effectively improved.
Description
Technical Field
The present application relates to the field of liquid crystal display technology, and in particular, to a compensation circuit and a liquid crystal display device.
Background
In the prior art, a processing device (such as a graphics card in a computer) sends video data to a liquid crystal display device to drive the liquid crystal display device to display a corresponding picture.
The prior art has the defects that the processing capability is limited, the frame rate of the video data which can be output is lower when the processing equipment processes some more complex picture contents, and the frame rate of the video data which can be output is higher when the processing equipment processes some simpler picture contents, so that the frame rate corresponding to the video data received by the liquid crystal display equipment is changed along with time, further, the amplitude of the pixel voltage signal received by each pixel point on the liquid crystal display equipment is changed continuously, the amplitude of the common electrode voltage signal is a constant value, the amplitude of the differential pressure signal of the pixel voltage signal and the common electrode voltage signal is changed continuously, and the differential pressure signal is a signal for supplying power to the pixel points, so that the brightness of the pixel points is also changed continuously along with time, and the brightness stability of the liquid crystal display picture is reduced.
Disclosure of Invention
The application mainly solves the technical problem of improving the brightness stability of the liquid crystal display picture.
In order to solve the technical problems, the first technical scheme adopted by the application is as follows: a compensation circuit for: receiving a pixel voltage signal and a first common electrode voltage signal corresponding to a target pixel point; and generating a second common electrode voltage signal based on the pixel voltage signal and the first common electrode voltage signal, so that the peak-to-peak value of the second voltage difference signal is smaller than the peak-to-peak value of the first voltage difference signal, wherein the first voltage difference signal is a difference signal between the first common electrode voltage signal and the pixel voltage signal, and the second voltage difference signal is a difference signal between the second common electrode voltage signal and the pixel voltage signal.
Wherein the compensation circuit includes: a control signal generation circuit for generating a control signal based on the pixel voltage signal; and a second common electrode voltage signal generating circuit for generating a second common electrode voltage signal based on the control signal and the first common electrode voltage signal.
The control signal generation circuit is specifically configured to: acquiring a continuous refreshing time period and a stopping refreshing time period of a picture in a pixel voltage signal; the first control signal is generated during a frame-continuous refresh period and the second control signal is generated during a frame-stop refresh period, and the control signal is derived based on the first control signal and the second control signal.
Wherein the second common electrode voltage signal generating circuit includes: a first circuit for generating a compensation signal based on the control signal; and a second circuit for compensating the first common electrode voltage signal based on the compensation signal to generate a second common electrode voltage signal.
Wherein the first circuit comprises: the first switch module, one end of the first switch module receives the power supply voltage, the driving end of the first switch module receives the control signal; one end of the resistor is connected with the other end of the first switch module; one end of the capacitor is connected with the other end of the resistor, and the other end of the capacitor is grounded; one end of the second switch module is connected with one end of the capacitor, and the other end of the second switch module is connected with the other end of the capacitor; the input end of the NOT gate is connected with the driving end of the first switch module, and the output end of the NOT gate is connected with the driving end of the second switch module; one end of the capacitor is used for outputting a compensation signal.
Wherein the second circuit comprises: the positive input end of the operational amplifier receives the first common electrode voltage signal, the negative input end of the operational amplifier receives the compensation signal, and the output end of the operational amplifier outputs the second common electrode voltage signal.
The first switch module or the second switch module is a transmission gate.
The transmission gate comprises a PMOS tube and an NMOS tube.
Wherein the compensation circuit is further configured to: obtaining a second voltage difference signal based on the pixel voltage signal and the second common electrode voltage signal; and taking the second differential pressure signal as a power supply signal to supply power to the liquid crystal layer corresponding to the target pixel point.
In order to solve the technical problems, a second technical scheme adopted by the application is as follows: a liquid crystal display device includes a data driving chip, a gate scanning chip, a thin film transistor circuit, and the compensation circuit.
The application has the beneficial effects that: compared with the prior art, the technical scheme of the application is characterized in that the pixel voltage signal and the first common electrode voltage signal corresponding to a target pixel point in the liquid crystal display device are received through the compensation circuit, and the second common electrode voltage signal is generated based on the pixel voltage signal and the first common electrode voltage signal, so that the peak-to-peak value of the difference signal between the second common electrode voltage signal and the pixel voltage is smaller than the peak-to-peak value of the difference signal between the first common electrode voltage signal and the pixel voltage, namely, based on the mode, the voltage amplitude of the target pixel point can be supplied with power more stably according to the generated difference signal between the second common electrode voltage signal and the pixel voltage signal, and the brightness stability of a liquid crystal display picture is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a compensation circuit of the present application;
FIG. 2 is an exemplary pixel-dependent circuit schematic;
FIG. 3 is a schematic waveform diagram of signals in the compensation circuit of the present application;
FIG. 4 is a schematic diagram illustrating a second embodiment of a second common electrode voltage signal generating circuit according to the present application;
FIG. 5 is a schematic diagram of a first embodiment of the first circuit of the present application;
FIG. 6 is a schematic diagram of a second circuit according to an embodiment of the present application;
fig. 7 is a schematic structural view of an embodiment of the liquid crystal display device of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
The terms "first" and "second" in the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
The present application first proposes a compensation circuit, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the compensation circuit of the present application, and the compensation circuit 10 can be used for:
and receiving a pixel voltage signal and a first common electrode voltage signal corresponding to the target pixel point. The second common electrode voltage signal is generated based on the pixel voltage signal and the first common electrode voltage signal such that a peak-to-peak value of the second voltage difference signal is smaller than a peak-to-peak value of the first voltage difference signal.
The first voltage difference signal is a difference signal between the first common electrode voltage signal and the pixel voltage signal, and the second voltage difference signal is a difference signal between the second common electrode voltage signal and the pixel voltage signal.
As shown in fig. 2, fig. 2 is an exemplary circuit diagram related to a pixel, in a conventional lcd device, a data driving chip, a gate scanning chip and at least one thin film transistor are generally disposed, the data driving chip may be used for outputting a pixel voltage signal to one end of a thin film transistor, the gate scanning chip may be used for outputting a driving voltage signal for turning on or off two ends of the thin film transistor to the driving end of the thin film transistor, the other end of the thin film transistor is connected to one end of a capacitor, and the other end of the capacitor is used for receiving a first common electrode voltage signal, typically, the first common electrode voltage signal is a voltage signal with a constant amplitude generated by a common electrode voltage generating circuit (not shown).
As shown in fig. 2, in the conventional lcd device, a capacitor with two ends respectively receiving a pixel voltage signal and a first common electrode voltage signal is used to supply power to a liquid crystal layer corresponding to the pixel, and the frame rate of video data received by the lcd device is unstable, so that the pixel voltage signal is unstable, and further, a first differential voltage signal corresponding to the pixel voltage signal and the first common electrode voltage signal is unstable, which finally results in unstable power supply voltage of the liquid crystal layer corresponding to the pixel, and poor brightness stability of the pixel.
The compensation circuit 10 in this embodiment may generate the second common electrode voltage signal according to the pixel voltage signal and the first common electrode voltage signal, where a peak-to-peak value of the second differential voltage signal is smaller than a peak-to-peak value of the first differential voltage signal, that is, a difference between a maximum amplitude and a minimum amplitude of a difference signal between the second common electrode voltage signal and the pixel voltage signal is smaller than a difference between a maximum amplitude and a minimum amplitude of a difference signal between the first common electrode voltage signal and the pixel voltage signal, that is, the second differential voltage signal is used to supply power to the liquid crystal layer corresponding to the pixel point, which is compared with the conventional liquid crystal display device that uses the first differential voltage signal to supply power to the liquid crystal layer corresponding to the pixel point, so that compensation of a supply voltage to the liquid crystal layer is realized, and the supply voltage to the liquid crystal layer is more stable, and brightness stability of the pixel point is further improved.
Compared with the prior art, the technical scheme of the application is characterized in that the pixel voltage signal and the first common electrode voltage signal corresponding to a target pixel point in the liquid crystal display device are received through the compensation circuit, and the second common electrode voltage signal is generated based on the pixel voltage signal and the first common electrode voltage signal, so that the peak-to-peak value of the difference signal between the second common electrode voltage signal and the pixel voltage is smaller than the peak-to-peak value of the difference signal between the first common electrode voltage signal and the pixel voltage, namely, based on the mode, the voltage amplitude of the target pixel point can be supplied with power more stably according to the generated difference signal between the second common electrode voltage signal and the pixel voltage signal, and the brightness stability of a liquid crystal display picture is improved.
In one embodiment, as shown in fig. 1, the compensation circuit 10 includes a control signal generation circuit 11 and a second common electrode voltage signal generation circuit 12.
The control signal generation circuit 11 is configured to generate a control signal based on the pixel voltage signal, and the second common electrode voltage signal generation circuit 12 is configured to generate a second common electrode voltage signal based on the control signal and the first common electrode voltage signal.
Specifically, the control signal generating circuit 11 may be configured to generate a control signal including information of a characteristic of the pixel voltage signal according to the characteristic, and the second common electrode voltage signal generating circuit 12 may receive the control signal and generate a second common electrode voltage signal based on the control signal and the first common electrode voltage signal, where a waveform of the second common electrode voltage signal is more similar to a waveform of the pixel voltage signal than a waveform of the first common electrode voltage signal having a constant amplitude, so that a peak-to-peak value of the second voltage difference signal is smaller than a peak-to-peak value of the first voltage difference signal.
Alternatively, the control signal generation circuit 11 may be specifically configured to:
a picture continuous refresh period and a picture stop refresh period in a pixel voltage signal are acquired.
The first control signal is generated during a frame-continuous refresh period and the second control signal is generated during a frame-stop refresh period, and the control signal is derived based on the first control signal and the second control signal.
Specifically, the control signal generating circuit 11 may determine, first, a period when the frame corresponding to the target pixel point in the pixel voltage signal is continuously refreshed and a period when the frame stops being refreshed, as shown in fig. 3, fig. 3 is a schematic waveform of signals in the compensation circuit of the present application, for example, in the pixel voltage signal in fig. 3, period 1 is a period when the frame of the target pixel point is still continuously refreshed, and period 2 is a period when the frame of the target pixel point has stopped being refreshed, and the frame rate of the frame display of the pixel point corresponding to the first group and the third group of adjacent periods 1 and 2 from left to right in fig. 3 may be a first frame rate, and the frame rate of the frame display of the pixel point corresponding to the second group of adjacent periods 1 and 2 may be a second frame rate, where the first frame rate is smaller than the second frame rate. For example, the first frame rate may be 48Hz and the second frame rate may be 165Hz.
In each period 2, due to the dew point problem of the liquid crystal display device, the voltage amplitude of the pixel voltage signal gradually decreases, so if the first voltage difference signal is directly used to supply power to the liquid crystal layer as in the conventional technology, the amplitude of the first voltage difference signal in the period 2 will be continuously changed, which further results in the decrease of the brightness stability of the pixel point.
The first control signal may be a low level signal, and the second control signal may be a high level signal, for example, the control signal in fig. 3 is a signal obtained by combining the first control signal and the second control signal.
In this way, the first control signal and the second control signal which are respectively of different types may be generated in different time periods, and the first control signal and the second control signal may be synthesized to obtain the control signal, where the control signal may record the information of the characteristics of the pixel voltage signal through the staggered arrangement of the first control signal and the second control signal, so that the second common electrode voltage signal generating circuit 12 may generate the second common electrode voltage signal based on the information.
Further, as shown in fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the second common electrode voltage signal generating circuit of the present application, and the second common electrode voltage signal generating circuit 12 includes a first circuit 121 and a second circuit 122.
The first circuit 121 is configured to generate a compensation signal based on the control signal. The second circuit 122 is configured to compensate the first common electrode voltage signal based on the compensation signal to generate a second common electrode voltage signal.
Further, as shown in fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the first circuit of the present application, and the first circuit 121 may specifically include a first switch module 1211, a resistor 1212, a capacitor 1213, a second switch module 1214 and a not gate 1215.
One end of the first switch module 1211 receives the power voltage, and the driving end of the first switch module 1211 receives the control signal. One end of the resistor 1212 is connected to the other end of the first switch module 1211. One end of the capacitor 1213 is connected to the other end of the resistor 1212, and the other end of the capacitor 1213 is grounded. One end of the second switch module 1214 is connected to one end of the capacitor 1213, and the other end of the second switch module 1214 is connected to the other end of the capacitor 1213. The input end of the NOT gate 1215 is connected to the driving end of the first switch module 1211, and the output end of the NOT gate 1215 is connected to the driving end of the second switch module 1214. Wherein one end of the capacitor 1213 is used to output the compensation signal.
Specifically, based on the first circuit 121, a compensation signal as shown in fig. 3 may be generated for the second circuit 122.
As shown in fig. 6, fig. 6 is a schematic diagram of an embodiment of the second circuit of the present application, and the second circuit 122 may include an operational amplifier 1221.
The positive input of the operational amplifier 1221 receives the first common electrode voltage signal, the negative input of the operational amplifier 1221 receives the compensation signal, and the output of the operational amplifier 1221 outputs the second common electrode voltage signal.
Specifically, based on the operation amplifier 1221, the first common electrode voltage signal received by the positive input terminal and the compensation signal received by the negative input terminal are subjected to operation processing, so that a second common electrode voltage signal as shown in fig. 3 can be generated, and then a target pixel point can be powered based on a difference signal between the second common electrode voltage signal and the pixel voltage signal, that is, based on a second voltage difference signal, as shown in fig. 3, since the second common electrode voltage signal is similar or identical to the pixel voltage signal in waveform, the amplitude of the corresponding second voltage difference signal is relatively stable, and thus the brightness stability of the liquid crystal display device where the target pixel point is located can be ensured.
Specifically, the first switch module or the second switch module may be a transmission gate, and specifically may be a CMOS transmission gate, where the CMOS transmission gate includes a PMOS transistor and an NMOS transistor. In addition, the first switch module or the second switch module may be other types of switch modules, which may be specifically determined according to actual requirements, and are not limited herein.
In one embodiment, the compensation circuit 10 may also be used to:
a second voltage difference signal is derived based on the pixel voltage signal and the second common electrode voltage signal.
And taking the second differential pressure signal as a power supply signal to supply power to the liquid crystal layer corresponding to the target pixel point.
Specifically, the voltage difference between the pixel voltage signal and the second common electrode voltage signal can be used as the power supply signal/power supply voltage of the liquid crystal layer corresponding to the target pixel point, so as to supply power to the liquid crystal layer stably enough, and further improve the brightness stability of the liquid crystal display device.
The present application also proposes a liquid crystal display device, as shown in fig. 7, fig. 7 is a schematic structural diagram of an embodiment of the liquid crystal display device of the present application, and the liquid crystal display device 70 includes a data driving chip 71, a gate scanning chip 72, a thin film transistor circuit 73 and any of the compensation circuits 74 described in the previous embodiments.
Specifically, the data driving chip 71 is used to drive the liquid crystal display device to perform a display operation. The data driving chip 71 may be used to output a pixel voltage signal to one end of a thin film transistor in the thin film transistor circuit 73, the gate scanning chip 72 may be used to output a driving voltage signal for turning on or off two ends of the thin film transistor to a driving end of the thin film transistor, the other end of the thin film transistor is connected to one end of a capacitor, and the other end of the capacitor is used to receive a second common electrode voltage signal output by the compensation circuit 74, where the first common electrode voltage signal is a voltage signal with a constant amplitude.
The liquid crystal display device 70 may further include a processor (not shown) and a display panel (not shown).
The processor may be any type of device having computing or data processing capabilities, and is not limited in this regard. The display panel may include a plurality of pixel units arranged in an array, each pixel unit including at least one light emitting device, such as an LED (light-emitting diode). The display panel may be any one of a TN (Twisted Nematic) panel, an IPS (In-Plane Switching) panel, a VA (Vertical Alignment) panel, and other types of display panels, which are not limited herein.
Compared with the prior art, the technical scheme of the application is characterized in that the pixel voltage signal and the first common electrode voltage signal corresponding to a target pixel point in the liquid crystal display device are received through the compensation circuit, and the second common electrode voltage signal is generated based on the pixel voltage signal and the first common electrode voltage signal, so that the peak-to-peak value of the difference signal between the second common electrode voltage signal and the pixel voltage is smaller than the peak-to-peak value of the difference signal between the first common electrode voltage signal and the pixel voltage, namely, based on the mode, the voltage amplitude of the target pixel point can be supplied with power more stably according to the generated difference signal between the second common electrode voltage signal and the pixel voltage signal, and the brightness stability of a liquid crystal display picture is improved.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.
Claims (7)
1. A compensation circuit, wherein the compensation circuit is configured to:
receiving a pixel voltage signal and a first common electrode voltage signal corresponding to a target pixel point;
generating a second common electrode voltage signal based on the pixel voltage signal and the first common electrode voltage signal so that a peak-to-peak value of the second voltage difference signal is smaller than a peak-to-peak value of a first voltage difference signal, wherein the first voltage difference signal is a difference signal between the first common electrode voltage signal and the pixel voltage signal, and the second voltage difference signal is a difference signal between the second common electrode voltage signal and the pixel voltage signal;
the compensation circuit includes:
a control signal generation circuit for generating a control signal based on the pixel voltage signal;
a second common electrode voltage signal generation circuit for generating the second common electrode voltage signal based on the control signal and the first common electrode voltage signal;
the second common electrode voltage signal generating circuit includes:
a first circuit for generating a compensation signal based on the control signal;
a second circuit for compensating the first common electrode voltage signal based on the compensation signal to generate the second common electrode voltage signal;
the first circuit includes:
the first switch module is characterized by comprising a first switch module, a second switch module and a control signal, wherein one end of the first switch module receives a power supply voltage, and the driving end of the first switch module receives the control signal;
one end of the resistor is connected with the other end of the first switch module;
one end of the capacitor is connected with the other end of the resistor, and the other end of the capacitor is grounded;
one end of the second switch module is connected with one end of the capacitor, and the other end of the second switch module is connected with the other end of the capacitor;
the input end of the NOT gate is connected with the driving end of the first switch module, and the output end of the NOT gate is connected with the driving end of the second switch module;
one end of the capacitor is used for outputting the compensation signal.
2. The compensation circuit of claim 1, wherein the control signal generation circuit is specifically configured to:
acquiring a continuous refreshing time period and a stopping refreshing time period of a picture in the pixel voltage signals;
generating a first control signal in the continuous refreshing time period of the picture, generating a second control signal in the stopping refreshing time period of the picture, and obtaining the control signal based on the first control signal and the second control signal.
3. The compensation circuit of claim 1 wherein the second circuit comprises:
the positive input end of the operational amplifier receives the first common electrode voltage signal, the negative input end of the operational amplifier receives the compensation signal, and the output end of the operational amplifier outputs the second common electrode voltage signal.
4. The compensation circuit of claim 1, wherein the first switch module or the second switch module is a transmission gate.
5. The compensation circuit of claim 4 wherein the pass gate comprises a PMOS transistor and an NMOS transistor.
6. The compensation circuit of any one of claims 1 to 5 wherein the compensation circuit is further configured to:
obtaining the second voltage difference signal based on the pixel voltage signal and the second common electrode voltage signal;
and taking the second differential pressure signal as a power supply signal to supply power to the liquid crystal layer corresponding to the target pixel point.
7. A liquid crystal display device comprising a data driving chip, a gate scanning chip, a thin film transistor circuit, and the compensation circuit according to any one of claims 1 to 6.
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| CN202210375338.XA CN114743516B (en) | 2022-04-11 | 2022-04-11 | Compensation circuit and liquid crystal display device |
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