CN116312406A - Common voltage compensation circuit and display device - Google Patents
Common voltage compensation circuit and display device Download PDFInfo
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- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
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Abstract
The application discloses public voltage compensation circuit and display device, this public voltage compensation circuit includes: the non-inverting input end of the compensation module is connected with the initial public voltage, the inverting input end of the compensation module is connected with the feedback public voltage through a preset resistance-capacitance unit, and the output end of the compensation module is used for outputting the compensation public voltage which is related with the initial public voltage and the feedback public voltage; the first end of the multiple adjusting module is connected with a preset reference voltage and a feedback public voltage, the second end of the multiple adjusting module is connected with the inverting input end of the compensating module and one end of the preset resistance-capacitance unit, the third end of the multiple adjusting module is connected with the output end of the compensating module, and the multiple adjusting module is used for changing the resistance between the inverting input end and the output end of the connected compensating module based on the preset reference voltage and the feedback public voltage so as to adjust the compensation multiple of the public voltage. The method and the device realize dynamic adjustment of the common voltage compensation multiple.
Description
Technical Field
The application relates to the technical field of display, in particular to a common voltage compensation circuit and a display device.
Background
With the development of liquid crystal display technology, the requirements of display effect of the liquid crystal display panel are also increasing. The main factor affecting the display effect is the crosstalk phenomenon, and in order to achieve a better display effect, a method of adjusting the VCOM (common voltage) compensation multiple of the deflection of the liquid crystal molecules is generally adopted to improve the crosstalk phenomenon so as to optimize the display effect of the display panel.
At present, although the VCOM compensation circuit improves the crosstalk phenomenon, the feedback resistor is usually required to be manually replaced due to the process problem of an in-plane production line and the different purities of the materials, so that the amplification factor of the compensation module is regulated until a better VCOM compensation effect is achieved. The method is very troublesome, and because the VCOM voltages required by different panels are different, the required compensation multiples are different, but when the panels are produced in batches, different feedback resistors cannot be used for different panels.
Disclosure of Invention
The main objective of the present application is to provide a common voltage compensation circuit and a display device, which aim to dynamically adjust the VCOM compensation multiple, improve the compensation accuracy and improve the display effect of a panel.
To achieve the above object, the present application provides a common voltage compensation circuit including:
the non-inverting input end of the compensation module is connected with an initial public voltage, the inverting input end of the compensation module is connected with a feedback public voltage through a preset resistance-capacitance unit, and the output end of the compensation module is used for outputting the compensation public voltage, and the compensation public voltage is related to the initial public voltage and the feedback public voltage;
the system comprises a multiple adjusting module, wherein a first end of the multiple adjusting module is connected with a preset reference voltage and a feedback public voltage, a second end of the multiple adjusting module is connected with an inverting input end of the compensating module and one end of the preset resistance-capacitance unit, a third end of the multiple adjusting module is connected with an output end of the compensating module, and the multiple adjusting module is used for changing and connecting resistance between the inverting input end and the output end of the compensating module based on the preset reference voltage and the feedback public voltage so as to adjust the public voltage compensation multiple.
Optionally, the multiple adjusting module includes:
the non-inverting input end of the voltage comparator is connected with the feedback public voltage, the inverting input end of the voltage comparator is connected with the preset reference voltage, and the output end of the voltage comparator is used for outputting a corresponding level signal according to the comparison result of the feedback public voltage and the preset reference voltage;
the first end of the resistor selection unit is connected with the output end of the voltage comparator, the second end of the resistor selection unit is connected with the inverting input end of the compensation module and one end of the preset resistance-capacitance unit, the third end of the resistor selection unit is connected with the output end of the compensation module, and the multiple adjustment module is used for changing the resistor connected between the inverting input end and the output end of the compensation module according to the level signal output by the voltage comparator so as to adjust the common voltage compensation multiple.
Optionally, the voltage comparator outputs a high level signal when the feedback common voltage is greater than the preset reference voltage or the feedback common voltage is equal to the preset reference voltage.
Optionally, the voltage comparator outputs a low level signal when the feedback common voltage is less than the preset reference voltage or the feedback common voltage is equal to the preset reference voltage.
Optionally, the resistance selection unit includes:
the grid electrode of the field effect tube is connected with the output end of the voltage comparator, and one end of the field effect tube is connected with the inverting input end of the compensation module and one end of the preset resistance-capacitance unit;
and one end of the feedback resistor is connected with the other end of the field effect tube, and the other end of the feedback resistor is connected with the output end of the compensation module.
Optionally, when the voltage comparator outputs a high level signal, the field effect transistor is turned on, and the feedback resistor is connected between the inverting input end and the output end of the compensation module.
Optionally, when the voltage comparator outputs a low level signal, the field effect transistor is turned on, and the feedback resistor is connected between the inverting input end and the output end of the compensation module.
Optionally, the preset resistance-capacitance unit includes:
one end of the preset resistor is connected with the inverting input end of the compensation module and the second end of the multiple adjustment module;
one end of the preset capacitor is connected with the other end of the preset resistor, and the other end of the preset capacitor is connected with the feedback public voltage and the first end of the multiple adjusting module.
Optionally, the compensation module is an operational amplifier.
In addition, in order to achieve the above object, the present application also provides a display device including the common voltage compensation circuit as described above.
The embodiment of the application provides a public voltage compensation circuit and display device, and this application has optimized based on conventional VCOM compensation circuit, has obtained a public voltage compensation circuit, and this public voltage compensation circuit includes: the non-inverting input end of the compensation module is connected with an initial public voltage, the inverting input end of the compensation module is connected with a feedback public voltage through a preset resistance-capacitance unit, and the output end of the compensation module is used for outputting the compensation public voltage, and the compensation public voltage is related to the initial public voltage and the feedback public voltage; the system comprises a multiple adjusting module, wherein a first end of the multiple adjusting module is connected with a preset reference voltage and a feedback public voltage, a second end of the multiple adjusting module is connected with an inverting input end of the compensating module and one end of the preset resistance-capacitance unit, a third end of the multiple adjusting module is connected with an output end of the compensating module, and the multiple adjusting module is used for changing and connecting resistance between the inverting input end and the output end of the compensating module based on the preset reference voltage and the feedback public voltage so as to adjust the public voltage compensation multiple.
According to the VCOM compensation device, the feedback public voltage and the multiple groups of preset reference voltages are compared, and then the appropriate feedback resistor is selected to be connected between the inverting input end and the output end of the compensation module according to the comparison result, and then the appropriate compensation multiple is output to enter the display panel to carry out VCOM compensation, so that the VCOM compensation multiple is dynamically adjusted, the problem that the resistance of the feedback resistor used for VCOM compensation in the prior art is fixed and cannot adapt to the inter-chip difference of the display panel is solved, the time cost of manually replacing the feedback resistor is reduced, the compensation accuracy is improved, and the crosstalk phenomenon can be remarkably improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from the structures shown in these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a common voltage compensation circuit according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a common voltage compensation circuit according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name | |
| VCOM | Initial common voltage | 10 | Compensation module | |
| VCOM_FB | Feedback of common voltage | 20 | Preset resistance-capacitance unit | |
| VCOM_OUT | Compensating for common voltage | 30 | Multiple adjusting module | |
| Vref | Preset reference voltage | 301 | Voltage comparator | |
| POWER | Preset power supply | 302 | Resistor selection unit | |
| C1 | Preset capacitor | R0 | Preset resistor | |
| Vref1 | |
R1 | |
|
| Vref2 | Preset reference voltage 2 | R2 | Voltage dividing resistor 2 | |
| Vrefn | Preset reference voltage n | Rn | Voltage dividing resistor n | |
| | Feedback voltage | 1 | D1 | |
| V2 | Feedback voltage 2 | D2 | Voltage comparator 2 | |
| Vn | Feedback voltage n | Dn | Voltage comparator n | |
| Q1 | |
| Feedback resistor | 1 |
| Q2 | Field effect transistor 2 | RF2 | Feedback resistor 2 | |
| Qn | Field effect transistor n | RFn | Feedback resistor n | |
| GND | Ground signal |
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed.
In addition, descriptions such as those related to "first," "second," and the like, are provided 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 this application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B meet at the same time.
In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "secured," and the like are to be construed broadly, and for example, "secured" may be either permanently attached or removably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of embodiments of the present application mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The most important reason for cross talk is the characteristic of the display panel, according to the TFT (Thin Film Transistor ) model of the LCD (Liquid Crystal Display, liquid crystal display) panel, the Source Driver will output Data signals to pressurize the liquid crystal capacitor and charge the storage capacitor in a specific time, at this time, the liquid crystal will turn over the corresponding angle to make light pass through a certain flux, when the next row of pixels starts, the TFT switch of the previous row will be turned off, at this time, the storage capacitor of each pixel of the previous row will discharge the liquid crystal, and a frame time will be maintained until the next CK (clock) signal comes to continuously pressurize the pixel capacitor of the row to charge the storage capacitor, if the displayed picture is not a pure gray-scale picture, the voltage of the pixels in the row is not constant in this frame time, at this time, the voltage output by the Source Driver is a value that changes with a fixed period, due to the coupling effect of the storage capacitor and the common voltage VCOM in the liquid crystal capacitor will produce the same voltage along with the video, thus the cross talk will be reduced to the same value, and the cross talk will be compensated for the cross talk, so that the cross talk is based on the video offset, and the cross talk will be a proper level.
An embodiment of the present application provides a common voltage compensation circuit, referring to fig. 1, fig. 1 is a schematic structural diagram of the common voltage compensation circuit according to an embodiment of the present application.
In this embodiment, the common voltage compensation circuit includes:
the non-inverting input end of the compensation module 10 is connected to an initial common voltage VCOM, the inverting input end of the compensation module 10 is connected to a feedback common voltage vcom_fb through a preset resistance-capacitance unit 20, and the output end of the compensation module 10 is used for outputting a compensation common voltage vcom_out, wherein the compensation common voltage vcom_out is related to the initial common voltage VCOM and the feedback common voltage vcom_fb;
the multiple adjusting module 30, a first end of the multiple adjusting module 30 is connected to a preset reference voltage Vref and the feedback common voltage vcom_fb, a second end of the multiple adjusting module 30 is connected to an inverting input end of the compensation module 10 and one end of the preset resistance-capacitance unit 20, a third end of the multiple adjusting module 30 is connected to an output end of the compensation module 10, and the multiple adjusting module 30 is configured to change a resistor connected between the inverting input end and the output end of the compensation module 10 based on the preset reference voltage Vref and the feedback common voltage vcom_fb so as to adjust a common voltage compensation multiple.
As an example, the compensation module 10 is an operational amplifier.
It should be noted that, the common voltage compensation circuit provided in this embodiment is mainly used for compensating the VCOM voltage of the display panel, the adjustment of the compensation multiple is mainly implemented by changing the resistance between the inverting input end and the output end of the access compensation module 10 through the multiple adjustment module 30, and the preset reference voltage Vref in this embodiment may be multiple groups of preset reference voltages Vref, so that the common voltage compensation circuit can select different feedback resistors according to different feedback common voltages vcom_fb of different display panels to adjust the VCOM compensation multiple, so as to adapt to different display panels and overcome the inter-chip variability.
According to the embodiment, the feedback public voltage VCOM_FB is compared with the multiple groups of preset reference voltages Vref, and then a proper feedback resistor is selected according to a comparison result to be connected between the inverting input end and the output end of the compensation module 10, and then a proper compensation multiple is output to enter the display panel to carry out VCOM compensation, so that the VCOM compensation multiple is dynamically adjusted, the problem that the resistance of the feedback resistor for VCOM compensation in the prior art is fixed and cannot adapt to the inter-chip difference of the display panel is solved, the time cost of manually replacing the feedback resistor is reduced, the compensation accuracy is improved, and the crosstalk phenomenon can be remarkably improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a common voltage compensation circuit according to another embodiment of the present application. As shown in fig. 2, in this embodiment, the multiple adjusting module 30 includes:
the non-inverting input end of the voltage comparator 301 is connected to the feedback common voltage vcom_fb, the inverting input end of the voltage comparator 301 is connected to the preset reference voltage Vref, and the output end of the voltage comparator 301 is used for outputting a corresponding level signal according to the comparison result of the feedback common voltage vcom_fb and the preset reference voltage Vref;
the first end of the resistor selection unit 302 is connected with the output end of the voltage comparator 301, the second end of the resistor selection unit 302 is connected with the inverting input end of the compensation module 10 and one end of the preset resistance-capacitance unit 20, the third end of the resistor selection unit 302 is connected with the output end of the compensation module 10, and the multiple adjustment module 30 is used for changing the resistor connected between the inverting input end and the output end of the compensation module 10 according to the level signal output by the voltage comparator 301 so as to adjust the common voltage compensation multiple.
It should be noted that, in this embodiment, the multiple adjusting module 30 includes at least one set of voltage comparators 301 and resistor selection units 302, the number of the voltage comparators 301 and the number of the resistor selection units 302 are in one-to-one correspondence, and the output ends of the voltage comparators 301 are only connected with the first ends of the resistor selection units 302.
It can be understood that, in the present embodiment, the non-inverting input terminal and the inverting input terminal of the voltage comparator 301 correspond to the first terminal of the multiple adjusting module 30, the second terminal of the resistor selecting unit 302 corresponds to the second terminal of the multiple adjusting module 30, and the third terminal of the resistor selecting unit 302 corresponds to the third terminal of the multiple adjusting module 30.
As an example, the voltage comparator 301 outputs a high level signal when the feedback common voltage vcom_fb is greater than the preset reference voltage Vref or the feedback common voltage vcom_fb is equal to the preset reference voltage Vref.
In this embodiment, the offset voltage of the voltage comparator 301 may be a positive value, so that the output level signal is a high level signal when the two voltage values at the input terminals are equal.
As an example, the voltage comparator 301 outputs a low level signal when the feedback common voltage vcom_fb is less than the preset reference voltage Vref or the feedback common voltage vcom_fb is equal to the preset reference voltage Vref.
In this embodiment, the offset voltage of the voltage comparator 301 may be a negative value, so that the output level signal is a low level signal when the two voltage values at the input terminals are equal.
According to the embodiment, the feedback public voltage VCOM_FB and the multiple groups of preset reference voltages Vref are compared through the voltage comparator 301, and then corresponding level signals are output to the resistor selection unit 302 according to comparison results, so that the resistor selection unit 302 can select a proper feedback resistor to be connected between the inverting input end and the output end of the compensation module 10, and then a proper compensation multiple is output to enter the display panel to carry out VCOM compensation, the VCOM compensation multiple is dynamically adjusted, the problem that the resistance of the feedback resistor for VCOM compensation in the prior art is fixed and cannot adapt to the inter-chip difference of different display panels is solved, the time cost of manually replacing the feedback resistor is reduced, the VCOM compensation accuracy is improved, and the crosstalk phenomenon can be remarkably improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a common voltage compensation circuit according to another embodiment of the present application. As can be seen from fig. 2 and 3, in this embodiment, the resistance selecting unit 302 includes:
the gate of the field effect transistor Q is connected with the output end of the voltage comparator 301, and one end of the field effect transistor Q is connected with the inverting input end of the compensation module 10 and one end of the preset resistance-capacitance unit 20;
and one end of the feedback resistor RF is connected with the other end of the field effect tube Q, and the other end of the feedback resistor RF is connected with the output end of the compensation module 10.
It should be noted that, in this embodiment, whether the feedback resistor RF can be connected between the inverting input terminal and the output terminal of the compensation module 10 is determined by the on-off state of the fet Q, and the on-off state of the fet Q is determined by the level signal input by the gate thereof.
It can be understood that, in this embodiment, the gate of the fet Q corresponds to the first end of the resistor selection unit 302, the end of the fet Q connected to the inverting input terminal of the compensation module 10 corresponds to the second end of the resistor selection unit 302, and the other end of the feedback resistor RF connected to the output terminal of the compensation module 10 corresponds to the third end of the resistor selection unit 302.
As an example, the multiple adjusting module 30 in this embodiment includes n groups of voltage comparators 301 and a resistor selecting unit 302, and accordingly, in this embodiment, by configuring a preset POWER supply POWER and n voltage dividing resistors R1, R2 to Rn (the resistance values of the voltage dividing resistors may be the same or different according to the actual situation), n different preset reference voltages Vref1, vref2 to Vrefn are respectively provided to the inverting input terminals of the n groups of voltage comparators D1, D2 to Dn (the voltage values of the preset reference voltages are different), and meanwhile, the feedback common voltage vcom_fb input to the non-inverting input terminals of the n groups of voltage comparators D1, D2 to Dn is represented as feedback voltages V1, V2 to Vn (the voltage value of the feedback voltages is the same as vcom_fb), the output level signals are respectively given to the field effect transistors Q1, Q2 to Qn, if Q1 is turned on, the feedback resistor connected is RF1, if Q2 is connected to Q2, and so on, if RF is connected to RFn.
Note that, the field-effect transistor used in this embodiment may be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field-effect transistor), a TFT (Thin Film Transistor, thin film field-effect transistor), or other devices having the same characteristics, and since the source and the drain of the field-effect transistor used in this embodiment are symmetrical, the source and the drain thereof are interchangeable, and therefore in this embodiment, it is not limited whether the two electrodes of the field-effect transistor except the gate are the source and the drain.
In addition, the field effect transistor adopted in the embodiment may include a P-type field effect transistor and/or an N-type field effect transistor, wherein the P-type field effect transistor is turned on when the gate is at a low level, turned off when the gate is at a high level, and turned on when the gate is at a high level, and turned off when the gate is at a low level.
In this embodiment, the type selection of the field effect transistor may be considered by integrating the type selection of the voltage comparator, and if the input ends of the voltage comparator 301 are equal, the high-level signal is output, the field effect transistor Q should be an N-type field effect transistor; if the input terminals of the voltage comparator 301 are equal, a low level signal is output, the fet Q should be selected as a P-fet.
As an example, when the voltage comparator 301 outputs a high level signal, the field effect transistor Q is turned on, and the feedback resistor RF is connected between the inverting input terminal and the output terminal of the compensation module 10.
It can be understood that the fet Q in this embodiment is an N-type fet.
As an example, when the voltage comparator 301 outputs a low level signal, the fet Q is turned on, and the feedback resistor RF is connected between the inverting input terminal and the output terminal of the compensation module 10.
It can be understood that the fet Q in this embodiment is a P-type fet.
In some possible embodiments, the preset resistance-capacitance unit 20 includes:
a preset resistor R0, wherein one end of the preset resistor R0 is connected with the inverting input end of the compensation module 10 and the second end of the multiple adjustment module 30;
one end of the preset capacitor C1 is connected to the other end of the preset resistor R0, and the other end of the preset capacitor C1 is connected to the feedback common voltage vcom_fb and is connected to the first end of the multiple adjusting module 30.
As an example, when vcom_fb=v1=vref 1, the field effect transistor Q1 is turned on, and the vcom_out outputs a reverse voltage to compensate vcom_fb, and the compensation multiple is RF1/R0.
As an example, when vcom_fb=v2=vref 2, the field effect transistor Q2 is turned on, and the vcom_out outputs a reverse voltage to compensate vcom_fb, and the compensation multiple is RF2/R0.
As an example, when vcom_fb=vn=vrefn, the field effect transistor Qn is turned on, and when vcom_out outputs a reverse voltage to compensate vcom_fb, the compensation multiple is RFn/R0.
As an example, when the field effect transistors Q are all turned on, the feedback resistors RF are also connected in multiple, and the compensation multiple is the ratio of the parallel resistance value of all the feedback resistors RF connected in multiple to R0.
In the embodiment, a plurality of groups of voltage comparators D1-Dn are arranged, the reference voltage Vref is generated by POWER, the reference voltage Vref1-Vrefn is divided into a plurality of voltage comparators by the series resistors R1-Rn, the input ends of the voltage comparators are feedback voltages of VCOM_FB, when VCOM_FB is different in value, the corresponding voltage comparators Dn and Dn are automatically selected to open the corresponding MOS tube Qn, at the moment, proper compensation multiples RFn/R0 can be output to enter the display panel for compensation, the dynamic adjustment of VCOM compensation multiples is realized, the problem that the feedback resistance fixed for VCOM compensation cannot adapt to the inter-chip differences of different display panels in the prior art is solved, the time cost of manually replacing the feedback resistor is reduced, the VCOM compensation accuracy is improved, and the crosstalk phenomenon can be remarkably improved.
In addition, the embodiment of the application also provides a display device, which comprises the common voltage compensation circuit, referring to fig. 4, and fig. 4 is a schematic structural diagram of the display device according to the embodiment of the application.
As shown in fig. 4, the display device may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the structure shown in fig. 4 is not limiting of the display device and may include more or fewer components than shown, or may combine certain components, or may be arranged in different components.
As shown in fig. 4, an operating system, a data storage module, a network communication module, a user interface module, and a computer program may be included in the memory 1005 as one type of storage medium.
In the display device shown in fig. 4, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in this embodiment may be provided in a display device which calls a computer program stored in the memory 1005 through the processor 1001 and controls the above-described common voltage compensation circuit.
All embodiments of the display device of the present application may refer to all embodiments of the common voltage compensation circuit of the present application, and are not described herein again.
It should be noted that the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on that the skilled person can realize that when the combination of the technical solutions contradicts or cannot be realized, the person should consider that the combination of the technical solutions does not exist, and is not within the scope of protection claimed in the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (10)
1. A common voltage compensation circuit, the common voltage compensation circuit comprising:
the non-inverting input end of the compensation module is connected with an initial public voltage, the inverting input end of the compensation module is connected with a feedback public voltage through a preset resistance-capacitance unit, and the output end of the compensation module is used for outputting the compensation public voltage, and the compensation public voltage is related to the initial public voltage and the feedback public voltage;
the system comprises a multiple adjusting module, wherein a first end of the multiple adjusting module is connected with a preset reference voltage and a feedback public voltage, a second end of the multiple adjusting module is connected with an inverting input end of the compensating module and one end of the preset resistance-capacitance unit, a third end of the multiple adjusting module is connected with an output end of the compensating module, and the multiple adjusting module is used for changing and connecting resistance between the inverting input end and the output end of the compensating module based on the preset reference voltage and the feedback public voltage so as to adjust the public voltage compensation multiple.
2. The common voltage compensation circuit of claim 1 wherein said multiple adjustment module comprises:
the non-inverting input end of the voltage comparator is connected with the feedback public voltage, the inverting input end of the voltage comparator is connected with the preset reference voltage, and the output end of the voltage comparator is used for outputting a corresponding level signal according to the comparison result of the feedback public voltage and the preset reference voltage;
the first end of the resistor selection unit is connected with the output end of the voltage comparator, the second end of the resistor selection unit is connected with the inverting input end of the compensation module and one end of the preset resistance-capacitance unit, the third end of the resistor selection unit is connected with the output end of the compensation module, and the multiple adjustment module is used for changing the resistor connected between the inverting input end and the output end of the compensation module according to the level signal output by the voltage comparator so as to adjust the common voltage compensation multiple.
3. The common voltage compensation circuit of claim 2, wherein the voltage comparator outputs a high level signal when the feedback common voltage is greater than the preset reference voltage or the feedback common voltage is equal to the preset reference voltage.
4. The common voltage compensation circuit of claim 2, wherein the voltage comparator outputs a low level signal when the feedback common voltage is less than the preset reference voltage or the feedback common voltage is equal to the preset reference voltage.
5. The common voltage compensation circuit of claim 2, wherein said resistance selection unit comprises:
the grid electrode of the field effect tube is connected with the output end of the voltage comparator, and one end of the field effect tube is connected with the inverting input end of the compensation module and one end of the preset resistance-capacitance unit;
and one end of the feedback resistor is connected with the other end of the field effect tube, and the other end of the feedback resistor is connected with the output end of the compensation module.
6. The common voltage compensation circuit of claim 5 wherein said field effect transistor is turned on when said voltage comparator outputs a high level signal, said feedback resistor being connected between an inverting input and an output of said compensation module.
7. The common voltage compensation circuit of claim 5 wherein said field effect transistor is turned on when said voltage comparator outputs a low level signal, said feedback resistor being connected between an inverting input and an output of said compensation module.
8. The common voltage compensation circuit of claim 1, wherein the preset resistance-capacitance unit comprises:
one end of the preset resistor is connected with the inverting input end of the compensation module and the second end of the multiple adjustment module;
one end of the preset capacitor is connected with the other end of the preset resistor, and the other end of the preset capacitor is connected with the feedback public voltage and the first end of the multiple adjusting module.
9. The common voltage compensation circuit of claim 1 wherein said compensation module is an operational amplifier.
10. A display device characterized in that the display device comprises the common voltage compensation circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310118818.2A CN116312406A (en) | 2023-01-31 | 2023-01-31 | Common voltage compensation circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310118818.2A CN116312406A (en) | 2023-01-31 | 2023-01-31 | Common voltage compensation circuit and display device |
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| CN116312406A true CN116312406A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310118818.2A Pending CN116312406A (en) | 2023-01-31 | 2023-01-31 | Common voltage compensation circuit and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116994536A (en) * | 2023-08-31 | 2023-11-03 | 惠科股份有限公司 | Common voltage compensation circuit, compensation method and display device |
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| CN116994536A (en) * | 2023-08-31 | 2023-11-03 | 惠科股份有限公司 | Common voltage compensation circuit, compensation method and display device |
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