CN116994536B - Common voltage compensation circuit, compensation method and display device - Google Patents

Common voltage compensation circuit, compensation method and display device Download PDF

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Publication number
CN116994536B
CN116994536B CN202311110110.9A CN202311110110A CN116994536B CN 116994536 B CN116994536 B CN 116994536B CN 202311110110 A CN202311110110 A CN 202311110110A CN 116994536 B CN116994536 B CN 116994536B
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target
compensation
voltage
display panel
signal
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CN116994536A (en
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秦福宏
袁海江
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HKC Co Ltd
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HKC Co Ltd
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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
    • 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

Abstract

The application provides a common voltage compensation circuit, a compensation method and display equipment, and relates to the technical field of display, wherein the common voltage compensation circuit comprises a control module and an adjustment operation module which are connected with each other; the control module is used for receiving the feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to the target preset value to the adjustment operation module according to the first corresponding relation when the fluctuation value exceeds the target preset value; the adjusting operation module is used for determining target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel; the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value. The technical scheme provided by the application can improve the flexibility of the compensation method and the display quality.

Description

Common voltage compensation circuit, compensation method and display device
Technical Field
The present application relates to the field of display technologies, and in particular, to a common voltage compensation circuit, a compensation method, and a display device.
Background
With the development of liquid crystal display technology, the display effect of the display panel is more and more important. In order to achieve a better display effect, common techniques are: a common voltage compensation method, a polarity inversion method, and the like.
The common voltage compensation method is realized by a common voltage compensation circuit, the common voltage compensation circuit is usually composed of an operational amplifier, the operational amplifier determines a compensation multiple according to the ratio of an input resistor to a feedback resistor, determines a compensation voltage according to the compensation multiple, and then outputs the compensation voltage to a display panel to compensate the power supply voltage in the display panel, thereby achieving the purpose of improving the display quality. The polarity inversion method improves display quality by changing the driving mode of liquid crystal. The common voltage compensation method and the polarity inversion method are used for solving the problem of abnormal display of the panel.
However, the common compensation circuit in the prior art has no way to use different amplification factors for different panels, and has no way to realize real-time change of resistance, so that flexibility is poor, and therefore, a new circuit and a corresponding compensation method are needed to solve the above problems.
Disclosure of Invention
In view of this, the embodiment of the application provides a common voltage compensation circuit for improving flexibility of the common voltage compensation circuit and improving display quality.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a common voltage compensation circuit, including: the control module and the regulation operation module are connected with each other;
the control module is used for receiving feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to a target preset value to the adjustment operation module according to a first corresponding relation when the fluctuation value exceeds the target preset value;
the adjusting operation module is used for determining a target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel;
the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
As an optional implementation manner of the embodiment of the present application, the control module includes a waveform analysis module and a timing controller which are connected;
the waveform analysis module is used for receiving the feedback voltage, determining a fluctuation value according to the feedback voltage, and sending a target compensation multiple corresponding to the target preset value to the time sequence controller according to a first corresponding relation when the fluctuation value exceeds the target preset value;
The time sequence controller is used for determining the target signal according to the target compensation multiple and sending the target signal to the adjustment operation module.
As an alternative implementation manner of the embodiment of the present application, the fluctuation value is a difference between the first voltage and the second voltage; the first voltage is a voltage value of a feedback voltage when the display panel has a display problem; the second voltage is a voltage value of the feedback voltage when the display panel has no display problem; the display problem includes at least crosstalk or greenness.
As an optional implementation manner of the embodiment of the present application, the adjustment operation module includes one or more sub-adjustment operation modules;
each sub-regulation operation module comprises a digital-to-analog conversion circuit and an operational amplifier;
the first end of the digital-to-analog conversion circuit is connected with the inverting input end of the operational amplifier, the second end of the digital-to-analog conversion circuit is connected with the output end of the operational amplifier, and the third end of the digital-to-analog conversion circuit is connected with the control module;
the digital-to-analog conversion circuit is used for receiving the target signal and determining a target value of a feedback resistor according to the target signal;
The operational amplifier is used for determining a target compensation voltage according to the target value of the feedback resistor and outputting the target compensation voltage to the display panel.
As an optional implementation manner of the embodiment of the present application, the third terminal of the digital-to-analog conversion circuit includes 2M control terminals, the digital-to-analog conversion circuit includes N resistors and N switch modules, the N resistors are connected in series, each resistor is correspondingly connected to a first terminal of one switch module, second terminals of the N switch modules are connected together, and the N switch modules are further connected to the 2M control terminals; the N resistors are used for gating through the target signals received by the 2M control terminals and determining the target value of the feedback resistor, wherein N=2 M M is an integer greater than 1.
As an alternative implementation manner of the embodiment of the present application, the digital-to-analog conversion circuit includes a plurality of serially connected sub digital-to-analog conversion circuits;
each sub digital-to-analog conversion circuit comprises a resistor, a first switching tube and a second switching tube;
the resistor is connected with the first switching tube in series, and the second switching tube is connected with the resistor and two ends of the first switching tube in parallel after being connected in series;
The plurality of serially connected sub digital-to-analog conversion circuits are used for gating according to the target signal and determining the target value of the feedback resistor.
In a second aspect, an embodiment of the present application provides a compensation method applied to the common voltage compensation circuit in any one of the first aspects, where the compensation method includes:
the control module receives feedback voltage of the display panel and determines a fluctuation value according to the feedback voltage;
when the fluctuation value exceeds a target preset value, the control module sends a target signal corresponding to the target preset value to the adjustment operation module according to a first corresponding relation;
the adjusting operation module determines a target compensation voltage according to the target signal and outputs the target compensation voltage to the display panel;
the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
As an optional implementation manner of the embodiment of the present application, the compensation method further includes:
When the display panel displays a preset picture, a time sequence controller in the control module outputs a polarity inversion signal to the waveform analysis module;
the waveform analysis module sends a first compensation multiple signal to the time sequence controller under the condition that the polarity inversion signal is at a high level after receiving the polarity inversion signal; or, in the case that the polarity inversion signal is at a high level, transmitting a second compensation multiple signal to the timing controller; or, in case that the polarity inversion signal is at a low level, transmitting a third preset signal to the timing controller;
the third preset signal is used for indicating the time sequence controller to receive the target compensation multiple determined by the waveform analysis module, determining a group of control signals corresponding to the target compensation multiple according to the target compensation multiple, and transmitting the determined group of control signals to the adjustment operation module;
the time sequence controller determines a first target control signal according to the first compensation multiple signal and outputs the first target control signal to the adjustment operation module; or the time sequence controller determines a second target control signal according to the second compensation multiple signal and outputs the second target control signal to the adjustment operation module; or the timing controller outputs the determined set of control signals to the adjustment operation module;
The adjusting operation module does not gate a feedback resistor according to the first target control signal and does not output the target compensation voltage to the display panel; or the adjusting operation module determines the target compensation voltage according to one or more feedback resistors gated by the second target control signal and outputs the target compensation voltage to a display panel; or the adjusting operation module is used for determining a target compensation voltage by switching on one or more corresponding resistors according to the determined group of control signals and outputting the target compensation voltage to the display panel.
As an optional implementation manner of the embodiment of the present application, the first compensation multiple is zero, the second compensation multiple is greater than zero and less than a preset compensation multiple, and the preset compensation multiple is a minimum value of the plurality of different compensation multiples.
In a third aspect, an embodiment of the present application provides a display device, including a display panel and the common voltage compensation circuit described in any one of the foregoing first aspects;
the display panel is used for displaying images, outputting power supply voltage and feedback voltage to the common voltage compensation circuit, and receiving compensation voltage output by the common voltage compensation circuit.
The technical scheme provided by the embodiment of the application is that the public voltage compensation circuit comprises a control module and an adjustment operation module which are connected with each other; the control module is used for receiving the feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to the target preset value to the adjustment operation module according to the first corresponding relation when the fluctuation value exceeds the target preset value; the adjusting operation module is used for determining target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel; the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value. In the above scheme, the common voltage compensation circuit can flexibly adjust the compensation multiple to provide different compensation for different display panels or different compensation for the same display panel under different display conditions. The flexibility of the compensation method is improved, the application range is wider, and the display quality of the display panel and related electronic equipment can be improved.
Drawings
Fig. 1 is a schematic diagram of a conventional common voltage VCOM control circuit;
FIG. 2 is a schematic diagram of an operational amplifier according to the prior art;
fig. 3 is a waveform diagram of a feedback voltage vcom_fb1;
fig. 4 is a waveform diagram of the corresponding compensation voltage vcom_in1;
FIG. 5 is a schematic diagram of a common voltage compensation circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram of a specific structure of a common voltage compensation circuit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a connection relationship between an operational amplifier and a DAC module according to an embodiment of the application;
fig. 8 is a schematic structural diagram of a DAC module according to an embodiment of the application;
fig. 9 is a schematic diagram of a conduction result of a DAC module according to an embodiment of the application;
fig. 10 is a schematic diagram of another structure of a DAC module according to an embodiment of the application;
fig. 11 is a schematic diagram of another conduction result of the DAC module according to the embodiment of the application;
fig. 12 is a schematic diagram of a specific structure of a first sub-adjustment operation module according to an embodiment of the present application.
Reference numerals illustrate:
10-a display panel; 20-a control module; 30-adjusting an operation module; 201-a waveform analysis module; 202-a timing controller; 30A-a first sub-adjustment operation module; 30B-a second sub-adjustment operation module; 3011-a first operational amplifier; 3012-a second operational amplifier; 302-DAC.
Detailed Description
Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The terminology used in the description of the embodiments of the application is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the application.
At present, the display panel often has some common display problems, such as crosstalk, greenish (refer to incomplete transmission of three primary colors of red, green and blue, and occurrence of green screen), and the like. The Crosstalk can be classified into a general Crosstalk (a phenomenon in which Crosstalk occurs between two adjacent pixels) and a cross talk (a phenomenon in which a picture of a certain area in a screen affects the brightness of an adjacent area). In the prior art, a common voltage (Voltage Commonmode, VCOM) control circuit is generally used to compensate the power supply voltage of the display panel, so as to eliminate the display problem and improve the display quality of the display panel. Fig. 1 is a schematic diagram of a connection between a common voltage VCOM control circuit and a display panel. As shown in fig. 1, the display panel is connected to an operational amplifier module, and the operational amplifier module may include a plurality of operational amplifiers as shown in fig. 2, and fig. 1 is an example in which the operational amplifier module includes two operational amplifiers.
IN the following, a connection relationship will be described by taking an operational amplifier as an example, and referring to fig. 1 and 2, the non-inverting input terminal ("+" terminal IN fig. 2) of the operational amplifier 1 is connected to the first power supply voltage VCOM1 terminal of the display panel, the inverting input terminal ("-" terminal IN fig. 2) of the operational amplifier 1 is connected to the first feedback voltage vcom_fb1 terminal of the display panel through the input resistor R1 and the capacitor C1, and the output terminal of the operational amplifier 1 is connected to the first compensation voltage vcom_in1 terminal of the display panel. In addition, the operational amplifier 1 further has a feedback resistor R2, a first end of the feedback resistor R2 is connected to the inverting input terminal of the operational amplifier 1, and a second end of the feedback resistor R2 is connected to the output terminal of the operational amplifier 1. It is understood that the connection relationship between the operational amplifier 2 and the display panel is similar to that between the operational amplifier 1 and the display panel, and will not be described herein.
The method for VCOM compensation with the circuit shown above may include: the first power supply voltage VCOM1 of the display panel is input to the non-inverting input terminal ("+" terminal IN fig. 2) of the operational amplifier 1, the first feedback voltage vcom_fb1 of the display panel is input to the inverting input terminal ("-" terminal IN fig. 2) of the operational amplifier 1, then the operational amplifier 1 determines the compensation multiple according to the ratio (i.e. R2/R1) of the feedback resistor R2 and the input resistor R1, and then outputs the first compensation voltage vcom_in1 to the display panel according to the compensation multiple to compensate the first power supply voltage VCOM1 IN the display panel.
The first feedback voltage vcom_fb1 of the display panel has a corresponding relationship with the power supply voltage VCOM1 of the display panel. When the voltage of the first power supply voltage VCOM1 of the display panel fluctuates, the corresponding fluctuation can be fed back through the feedback voltage VCOM_FB1; correspondingly, after the operational amplifier 1 receives the feedback voltage vcom_fb1, the fluctuation condition of the first power supply voltage VCOM1 can be analyzed and compensated by combining the fluctuation, and the fluctuation of the first power supply voltage VCOM1 of the display panel can be weakened through compensation.
In the common voltage VCOM control circuit provided in the prior art, the resistance value of the input resistor R1 and the resistance value of the feedback resistor R2 in the operational amplifier are fixed, so that the determined amplification factor is also fixed, and then compensation is performed based on the fixed compensation factor during compensation.
For example, fig. 3 is a waveform diagram of the feedback voltage vcom_fb1, and fig. 4 is a waveform diagram of the corresponding compensation voltage vcom_in1. Assuming that the fluctuation range of VCOM_Fb1 shown in FIG. 3 is [ -10V, +10V ] and the corresponding fixed compensation multiple is 0.5, the fluctuation range of the compensation voltage is [ -5V, +5V ].
However, there is a difference between different display panels, and the required compensation factors are different, even if the same display panel is used in different display conditions; the display panels are produced in batch, different feedback resistors cannot be used for different display panels, and the sizes of the feedback resistors cannot be changed in real time under different display conditions to compensate different compensation multiples, so that the feedback resistors are fixed in the prior art, the compensation multiples are fixed, and the compensation method is inflexible. Therefore, a new circuit and a corresponding compensation method are needed to solve the above-mentioned problems.
In view of the above, the present application provides a common voltage compensation circuit, which includes a control module and a regulation operation module connected to each other; the control module is used for receiving the feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to the target preset value to the adjustment operation module according to the first corresponding relation when the fluctuation value exceeds the target preset value; the adjusting operation module is used for determining target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel; the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
The common voltage compensation circuit provided by the embodiment of the application can flexibly adjust the compensation multiple to provide different compensation for different display panels or provide different compensation for the same display panel under different display conditions. The flexibility of the compensation method is improved, the application range is wider, and the display quality of the display panel and related electronic equipment can be improved.
The common voltage compensation circuit provided by the embodiment of the application is described in detail below.
Fig. 5 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present application, and as shown in fig. 5, the common voltage compensation circuit may include: a control module 20 and a regulation operation module 30 which are connected with each other.
The control module 20 is configured to receive the feedback voltage of the display panel 10, determine a fluctuation value according to the feedback voltage, and send a target signal corresponding to a preset value to the adjustment operation module 30 according to the first correspondence when the fluctuation value of the feedback voltage exceeds the preset value.
The adjustment operation module 30 is used for switching on one or more corresponding resistors according to the target signal to obtain a target compensation voltage, and outputting the target compensation voltage to the display panel 10.
The first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
It should be noted that, in the case that the display panel has no display problem, the feedback voltage of the display panel 10 analyzed by the control module 20 has no fluctuation; in the case where a display problem occurs in the display panel, the feedback voltage of the display panel 10 analyzed by the control module 20 may fluctuate.
In the embodiment of the present application, when there is no display problem, the voltage value of the feedback voltage may be recorded as a second voltage, where the second voltage may be equal to the value of the power supply voltage of the display panel 10 in value, and it may be understood that there may be an error in practical application, so that, within the range allowed by the error, the value of the second voltage may be slightly greater than the value of the power supply voltage of the display panel 10 or slightly less than the value of the power supply voltage of the display panel 10, which is not particularly limited in the embodiment of the present application; when a display problem occurs, the voltage value of the feedback voltage may be recorded as the first voltage. The first voltage is larger than the second voltage, and the fluctuation value of the feedback voltage is the difference between the first voltage and the second voltage. It is understood that the voltage value of the first voltage may also be smaller than the voltage value of the second voltage. For the convenience of explanation, the voltage value of the first voltage is greater than the voltage value of the second voltage.
It should be appreciated that each preset value corresponds to a compensation factor that corresponds to a set of control signals.
The preset value is specified by the tester in advance in the product testing stage, and can be positive or negative, or can be only positive or only negative, and can be specifically set according to the actual situation, and the embodiment of the application is not particularly limited to the above, and is exemplified by taking the preset value as a positive number.
The magnitude of the preset values is used for representing the severity of the display problem, and each preset value has a corresponding compensation multiple. The larger the preset value, the more serious the display problem, which in turn indicates that a larger compensation multiple is required to generate the compensation voltage. The smaller the preset value, the lighter the display problem, which in turn indicates that a smaller compensation factor is required to generate the compensation voltage.
For example, a preset value of 0.5v (volts) represents the first gear, a preset value of 0.8v represents the second gear, and a preset value of 1.5v represents the third gear; when the fluctuation value of the feedback voltage exceeds 0.5v, the display problem of the current display panel 10 is shown, but the display problem is lighter, and the compensation multiple is set to be 10 times to improve the display problem; when the fluctuation value of the feedback voltage exceeds 0.8v, the current display panel 10 is shown to have serious display problems, and the compensation multiple is set to be 20 times to improve the display problems; when the fluctuation value of the feedback voltage exceeds 1v, it indicates that a very serious display problem occurs in the current display panel 10, and the compensation multiple needs to be set to be 50 times to improve the display problem. It will be appreciated that the numbers appearing in the foregoing are for illustrative purposes only, and that the numbers may be the same or different or more than the numbers shown in the foregoing, and are intended to be included in the practice.
The public voltage compensation circuit provided by the embodiment of the application comprises a control module and an adjustment operation module which are connected with each other; the control module is used for receiving the feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to the target preset value to the adjustment operation module according to the first corresponding relation when the fluctuation value exceeds the target preset value; the adjusting operation module is used for determining target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel; the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value. The common voltage compensation circuit provided by the embodiment of the application can flexibly adjust the compensation multiple to provide different compensation for different display panels or provide different compensation for the same display panel under different display conditions. The flexibility of the compensation method is improved, the application range is wider, and the display quality of the display panel and related electronic equipment can be improved.
The modules involved in the common voltage compensation circuit are described in detail below.
Fig. 6 is a schematic diagram of a specific structure of a common voltage compensation circuit according to an embodiment of the present application, where the Control module 20 may include a waveform analysis module 201 and a timing controller (TCON IC) 202, and the adjustment operation module 30 may include one or more sub-adjustment operation modules.
As an alternative embodiment, the waveform analysis module 201 may be independent of the timing controller 202, and the waveform analysis module 201 may also be integrated in the timing controller 202 to improve the integration level and reduce the circuit size, which is not particularly limited in the embodiment of the present application, and the waveform analysis module 201 is illustrated as being integrated in the timing controller 202.
Each sub-conditioning operation module includes an operational amplifier and a digital to analog converter (Digital to Analog Converter, DAC) 302. Fig. 6 shows that the adjustment operation module 30 includes two sub-adjustment operation modules, a first sub-adjustment operation module 30A and a second sub-adjustment operation module 30B, respectively. The first sub-adjustment operation module 30A includes a first operational amplifier 3011 and DAC302, and the second sub-adjustment operation module 30B includes a second operational amplifier 3012 and DAC302. It should be noted that, in practical application, the adjustment operation module 30 may include more sub-adjustment operation modules.
The connection relationship between the first operational amplifier 3011 and the DAC302 is described with reference to fig. 7 by taking the first sub-adjustment operation module 30A as an example. As shown in fig. 7, the first operational amplifier 3011 may include a non-inverting input terminal, an output terminal, an input resistor R1, and a capacitor C1 connected in series at the inverting input terminal. A first end of the DAC302 is connected to an inverting input of the first operational amplifier 3011, a second end of the DAC302 is connected to an output of the first operational amplifier 3011, and a third end of the DAC302 is connected to the control module 20. It is understood that the second sub-adjustment operation module 30B is similar to the first sub-adjustment operation module 30A, and will not be described herein.
With continued reference to fig. 6, there may be only one power supply voltage terminal of the display panel 10, that is, the VCOM terminal, and at this time, the non-inverting input terminal of each operational amplifier in the operational amplifier module will be connected to the same VCOM terminal; alternatively, the display panel 10 may have a plurality of power supply voltage terminals, i.e., the first power supply voltage VCOM1 terminal, the first power supply voltage VCOM2 terminal, and the like, and the non-inverting input terminal of each operational amplifier in the operational amplifier module is connected to a different power supply voltage terminal of the display panel. When the display panel is provided with a plurality of power supply voltage ends, the starting speed of the display panel can be improved, and the occurrence of the horizontal crosstalk display problem can be reduced.
The display panel 10 may include a plurality of feedback voltage terminals, such as a first feedback voltage vcom_fb1 terminal and a second feedback voltage vcom_fb2 terminal; the display panel 10 may further include a plurality of compensation voltage terminals, such as a first compensation voltage vcom_in1 terminal and a second compensation voltage vcom_in2 terminal, etc. Only two are shown in fig. 6 as an exemplary illustration, it being understood that more may be used in practice.
The connection relationship between the adjustment operation module 30 and the display panel 10 is described with reference to fig. 6 and 7 by taking the first sub adjustment operation module 30A as an example. As shown in fig. 6 and 7, the non-inverting input terminal of the first operational amplifier 3011 is connected to the first power supply voltage VCOM1 terminal of the display panel 10, and the inverting input terminal of the first operational amplifier 3011 is connected to the first feedback voltage vcom_fb1 terminal of the display panel 10 through the input resistor R1 and the capacitor C1; the output terminal of the first operational amplifier 3011 is connected to a first compensation voltage VCOM_In1 terminal of the display panel 10. It is understood that the connection relationship between the second sub-adjustment operation module 30B and the display panel 10 is similar to the connection relationship between the first sub-adjustment operation module 30A and the display panel 10, and will not be described herein.
The timing controller 202 is electrically connected to the display panel 10 and the adjustment operation module 30, and the detailed connection relationship can be obtained by referring to the related data manual.
The display panel 10 may be a liquid crystal display (Liquid Crystal Ddisplay, LCD), an Organic Light-Emitting Diode (OLED), a Twisted Nematic (TN), a VA panel, or the like, which is not particularly limited in the embodiment of the present application. The display panel 10 is mainly used for displaying pictures, and outputs a first power supply voltage VCOM1 to the first operational amplifier 3011, outputs a second power supply voltage VCOM2 to the second operational amplifier 3012, outputs a first feedback voltage vcom_fb1 to the waveform analysis module 201 and the first operational amplifier 3011, and simultaneously, also inputs a second feedback voltage vcom_fb2 to the waveform analysis module 201 and the second operational amplifier 3012; IN addition, the display panel 10 is further configured to receive the first compensation voltage vcom_in1 and the second compensation voltage vcom_in2.
The waveform analysis module 201 can store a plurality of different preset values, each preset value is a positive preset value, different gears are formed by sorting the preset values from small to large, each preset value has a corresponding compensation multiple, and the smaller the preset value is, the smaller the compensation multiple is, and the smaller the compensation voltage is.
The waveform analysis module 201 is configured to receive the first feedback voltage vcom_fb1 and the second feedback voltage vcom_fb2, determine a fluctuation value of the first feedback voltage vcom_fb1 according to the first feedback voltage vcom_fb1, determine a fluctuation value of the second feedback voltage vcom_fb2 according to the second feedback voltage vcom_fb2, and analyze the fluctuation value of the first feedback voltage vcom_fb1 and the fluctuation value of the second feedback voltage vcom_fb2 to know the severity of the display problem of the current display panel 10, that is, the more serious the display problem, the larger the fluctuation of the first feedback voltage vcom_fb1 and the second feedback voltage vcom_fb2, which indicates that the larger the compensation required by the first power voltage VCOM1 and the second power voltage VCOM 2.
Then, the waveform analysis module 201 determines which preset value the fluctuation value of the first feedback voltage vcom_fb1 exceeds, and sends a compensation multiple corresponding to the preset value to the timing controller 202 according to the first correspondence; meanwhile, it is determined which preset value the fluctuation value of the second feedback voltage vcom_fb2 exceeds, and according to the first correspondence, the compensation multiple corresponding to the preset value is sent to the timing controller 202.
The timing controller 202 determines a set of control signals corresponding to the compensation factors according to the compensation factors, and sends the determined set of control signals corresponding to the compensation factors to the adjustment operation module 30. Each compensation multiple corresponds to a set of control signals b, and the timing controller 202 transmits the control signals b to the adjustment operation module 30. Wherein, the group of control signals corresponding to the target preset value is defined as target signals; the group of control signals b comprises a plurality of control signals, and then comprises a control signal b2, a control signal b1, a control signal b0 and a control signal Control signal->And control signal->An exemplary illustration is made for an example.
The DAC302 in the adjustment operation module 30 receives the target signal, gates the corresponding resistor or resistors according to the target signal, and determines the target value of the feedback resistor. The operational amplifier in the operation module 30 is adjusted to determine a target compensation voltage according to the target value of the feedback resistor, and outputs the target compensation voltage to the display panel.
The timing controller 202 may be an integrated chip with a plurality of pins with different functions. It should be noted that, in the product testing stage, a tester may analyze, test and sort out display problems under each specific picture, which may occur, so as to obtain solutions under each specific picture, which not only can improve display quality, but also can reduce power consumption; the solution is then stored in the memory of the timing controller 202, so that when the problem of displaying a specific picture occurs in the product using stage in the later period, the solution can be directly called, and the efficiency of improving the display quality of the display panel 10 is improved. The solution includes three types of solutions, namely, only turning on a PDF function, both turning on VCOM compensation and turning on PDF, and only turning on VCOM compensation, wherein the solution under a specific picture is one of the three types of solutions, and the three types of solutions respectively correspond to three different signals.
The VCOM compensation principle is described in the foregoing, and the PDF function is briefly described here. The PDF function improves display quality mainly by reversing the polarity of driving liquid crystal on the display panel 10. The polarity inversion method includes: frame inversion (frame inversion), column inversion (column inversion), row inversion (rowdivision), and dot inversion (dotingdivision). The refresh rates of pictures at different polarity reversals are different and the power consumption required is also different.
In the embodiment of the application, whether the PDF function is started or not can be known through the POL2 signal. For example, in the case of a specific frame, when POL2 is a high level signal, it indicates that the PDF function is on, and the solution under this frame may be to turn on both VCOM compensation and PDF function, or may be to turn on only the PDF function, specifically to see which solution is stored by the tester during the test phase; when POL2 is a low level signal, the PDF function is turned off, and the VCOM compensation function is turned on only. The following describes the working procedure of the common voltage compensation circuit provided by the embodiment of the application:
in the case of a general display problem, the display problem of the display panel 10 can be improved by only using VCOM compensation, and the display quality of the display panel 10 is improved, specifically: the display panel 10 inputs the first feedback voltage vcom_fb1 and the second feedback voltage vcom_fb2 to the waveform analysis module 201 inside the timing controller 202, the waveform analysis module 201 performs real-time analysis on the waveform of the first feedback voltage vcom_fb1 and the waveform of the second feedback voltage vcom_fb2, determines which preset value is exceeded according to the fluctuation value of the waveform, determines the corresponding compensation multiple, and transmits the corresponding compensation multiple to the timing controller 202.
The timing controller 202 determines a corresponding set of control signals b according to the compensation multiple, and transmits the control signals b to the DAC302; DAC302 gates one or more resistors via control signal b to determine a target value for the feedback resistor.
The first operational amplifier 3011 determines a first compensation voltage vcom_in1 according to the target value of the feedback resistor, outputs the first compensation voltage vcom_in1 to the display panel 10, and compensates the first voltage supply VCOM1 of the display panel 10; the second operational amplifier 3012 determines a second compensation voltage vcom_in2 according to the target value of the feedback resistor, outputs the second compensation voltage vcom_in2 to the display panel 10, and compensates the second voltage supply VCOM2 of the display panel 10.
It can be understood that the power supply voltage VCOM of each operational amplifier can be the same or different, and is supplied according to the actual situation; the feedback voltage VCOM_FB connected with each operational amplifier can be the same or different and is detected according to actual conditions; the compensation voltage VCOM_IN of each operational amplifier can be the same or different and is adjusted according to the actual situation. The following description will be given by taking the example that the feedback voltage vcom_fb1 is relatively a large fluctuation and the feedback voltage vcom_fb2 is relatively a small fluctuation.
Further, when the display problem of the display panel 10 is large, the fluctuation of the feedback voltage vcom_fb1 is also large, at this time, the feedback voltage vcom_fb1 is large fluctuation, the waveform analysis module 201 determines which preset value the fluctuation value exceeds after analyzing the fluctuation value of the feedback voltage vcom_fb1, and then transmits the corresponding compensation multiple to the timing controller 202, the timing controller 202 outputs the control signal b to the DAC302 IN the first sub-adjustment operation module 30A, the DAC302 configures a feedback resistor with a large value, the first operational amplifier 3011 IN the first sub-adjustment operation module 30A forms a first compensation voltage vcom_in1 with a relatively large peak value according to the configured resistor, and outputs the first compensation voltage vcom_in1 to the compensation display panel 10 to compensate the first power supply voltage VCOM1 IN the display panel 10;
when the display problem of the display panel 10 is smaller, the fluctuation of the feedback voltage vcom_fb2 is also smaller, at this time, the feedback voltage vcom_fb2 is smaller fluctuation, the waveform analysis module 201 determines which preset value the fluctuation value exceeds after analyzing what the fluctuation value of the feedback voltage vcom_fb2 is, then the corresponding target adjustment compensation multiple is transmitted to the timing controller 202, the timing controller 202 outputs the control signal B to the DAC302 IN the second sub-adjustment operation module 30B, the DAC302 configures a feedback resistor with a smaller value, the second operational amplifier 3012 IN the second sub-adjustment operation module 30B forms a second compensation voltage vcom_in2 with a smaller peak value according to the configured resistor, and outputs the second compensation voltage vcom_in2 to the compensation display panel 10 to compensate the second power supply voltage VCOM2 IN the display panel 10.
When the display problem of the display panel 10 is particularly small, the fluctuation of the feedback voltage VCOM-FB is very small, and there is almost no fluctuation, and the timing controller 202 may control the output of the signal b so that the DAC does not gate the resistor, and the common voltage compensation circuit does not compensate at this time.
All of the above cases are common display problems. Under the condition that the common display problem occurs in the display panel, the common voltage compensation circuit provided by the embodiment of the application can adjust the compensation multiple in real time aiming at different display problems, so that the compensation flexibility is improved. In the case of encountering the display problem of the specific screen, the tester has already specified the solution of the display problem of the specific screen in the product testing stage, so that the tester can be used directly when the display problem of the specific screen occurs.
Specifically, upon encountering a display problem for a particular picture, the timing controller 202 invokes a corresponding solution stored in the internal memory. If the solution adopted by the display problem of the specific picture is VCOM compensation, the POL2 signal is in low level, and the VCOM compensation scheme is used for compensation under the condition that the common display problem occurs; if the solution adopted by the display problem of the specific picture is that only the PDF function is started, the POL2 signal is high level, and the VCOM compensation multiple is 0 (equivalent to no compensation); if the solution to the display problem for this particular picture is to turn on both the VCOM compensation and PDF functions, the POL2 signal is high and the VCOM compensation multiple is 1 (equivalent to a small compensation). It is understood that the small compensation factors can be other numbers besides 1, such as 1.5, 2, 3, 4, etc., and the small compensation factors are all optimal compensation factors which are adjusted according to actual conditions in the test stage.
The existing solution is directly called under the specific picture, so that the quality of the improved display effect can be improved, the display problem of the same specific picture can be reduced, and when the improved display effect is the same, the problems that the PDF function and the VCOM compensation function are both started can be reduced.
Further, for example, in the test stage, the display panel 10 presents a display problem of 10 stages, and the display problem of 10 stages is specified as a specific screen. In the test process, the tester finds that if only VCOM compensation is used, the problem of green display can be 3 levels, and when only PDF function is used, the problem of green display can be 2 levels, and then the solution of the problem of green display of 10 levels is defined as that only PDF function is started. During the test, the tester found that the problem of green development could be 3 stages if only VCOM compensation was used, but could be 3 stages if only PDF was used, but the problem of green development could be reduced to 2 stages if both PDF was turned on and VCOM was used, and in this case the compensation factor for VCOM was much smaller than that when VCOM was turned on only, then the solution for the problem of 10 stages of green development was defined as turning on both PDF and VCOM. In the test stage, the tester finds that the problem of green display can be reduced to 3 levels if VCOM compensation is only used, and the problem of display is reduced to 3 levels if PDF function is only started, and the tester selects one of the solutions for solving the problem of green display, which is 10 levels, by combining the problem of low power consumption.
According to the public voltage compensation circuit provided by the embodiment of the application, under the condition that the common display problem occurs, the DAC module can freely and flexibly select the size of the feedback resistor according to the fluctuation size, so that the compensation multiple can be changed, and compared with a scheme of fixing the feedback resistor and the compensation multiple, the public voltage compensation circuit can improve the flexibility of the compensation multiple and the display quality of the display panel; under the condition that the display problem of the specific picture occurs, the solution can be directly called, so that the efficiency of improving the display quality of the display panel can be improved, and the problem that the PDF function and the VCOM compensation function are started when the display effect is improved to be the same can be reduced because the display problem of the same specific picture can be reduced, thereby reducing the power consumption and saving the electric energy.
DAC302 of the present application is described in detail below:
the DAC302 mainly comprises resistors and switching tubes, and the embodiment of the application provides two different types of DAC302 structures, wherein the first DAC302 structure is shown in fig. 8, the third end of the DAC302 comprises 2M control ends, the DAC302 comprises N resistors and N switching modules, the N resistors are connected in series, each resistor is correspondingly connected with the first end of one switching module, the second ends of the N switching modules are connected together, the N switching modules are further connected with the 2M control ends, the N resistors are used for gating through target signals received by the 2M control ends, and the target value of the feedback resistor is determined, and n=2 M M is an integer greater than 1.
As an alternative embodiment, each switching module may comprise M switching tubes connected in series.
Referring to fig. 8, an exemplary description is given of an example where M is equal to 3 and n=8: each switch module comprises 3 switch tubes, 8 resistors are connected in series, each resistor is correspondingly connected with the first end of one switch module (namely, 8 resistors are correspondingly connected with 8 switch modules), the second ends of the 8 switch modules are connected together, and the 8 switch modules are also connected with 6 control ends. The 8 resistors are a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a resistor R38 respectively; the 8 switch modules are respectively a switch module 1, a switch module 2, a switch module 3, a switch module 4, a switch module 5, a switch module 6, a switch module 7 and a switch module 8.
Specifically, the resistor R31, the resistor R32 and the first end of the switch module 1 are connected to the point a, and the switch module 1 corresponds to the resistor R31; the resistor R32, the resistor R33 and the first end of the switch module 2 are connected to the point b, and the switch module 2 corresponds to the resistor R32; the resistor R33, the resistor R34 and the first end of the switch module 3 are connected to the point c, and the switch module 3 corresponds to the resistor R33; the resistor R34, the resistor R35 and the first end of the switch module 4 are connected to the point d, and the switch module 4 corresponds to the resistor R34; the resistor R35, the resistor R36 and the first end of the switch module 5 are connected to the point e, and the switch module 5 corresponds to the resistor R35; the resistor R36, the resistor R37 and the first end of the switch module 6 are connected to the f point, and the switch module 6 corresponds to the resistor R36; the resistor R37, the resistor R38 and the first end of the switch module 7 are connected to the g point, and the switch module 7 corresponds to the resistor R37; the resistor R38 and the first end of the switch module 8 are connected to the point h, and the switch module 8 corresponds to the resistor R38; the second ends of the switch module 1, the switch module 2, the switch module 3, the switch module 4, the switch module 5, the switch module 6, the switch module 7 and the switch module 8 are connected together; each switching module comprises 3 switching tubes connected in series.
The 8 resistors are used to gate the target signal received by the 6 control terminals and determine the target value of the feedback resistor. The resistances of the 8 resistors may be all the same or all different, or may include the same resistance, different resistances, or the like, and the embodiment of the present application is not particularly limited according to the actual situation. It will be appreciated that in practical applications, the number of resistors in series may be greater and the corresponding control signals may be increased. The number of the resistors which are conducted can be changed by controlling the high and low level of the control signal, so that different target adjustment compensation multiples can be obtained, and the purpose of flexible adjustment is realized.
FIG. 9 is a schematic diagram of a conduction result of a DAC module according to an embodiment of the present application, as shown in FIG. 9When the control signal b2, the control signal b1 and the control signal b0 are all high level signals, the control signalsControl signal->And control signalAll the 8 resistors of the resistor R31 to the resistor R38 are in low level, and the target value of the feedback resistor is R31+R32+R33+R34+R35+R36+R37+R38.
The second DAC302 is shown in fig. 10, where the DAC302 may include a plurality of serially connected sub-digital-to-analog conversion circuits, and three serially connected sub-digital-to-analog conversion circuits are taken as an example, and the connection relationship between the resistor and the two switching transistors is illustrated by taking the sub-digital-to-analog conversion circuit including the resistor R23 as an example: the resistor R23 is connected with the first switching tube in series, and the second switching tube is connected with the resistor R23 and the two ends of the first switching tube after being connected in series in parallel; the connection relationship between the internal resistors of the other two sub digital-to-analog conversion circuits and the switching tube is similar to that of the sub digital-to-analog conversion circuit comprising the resistor R23, and the sub digital-to-analog conversion circuits are not repeated here, and are connected in series. The plurality of serially connected sub digital-to-analog conversion circuits are used for gating according to the target signal and determining the target value of the feedback resistor. The resistances of the resistors in the 3 sub digital-to-analog conversion circuits may be all the same, may be all different, may include both the same resistance and different resistance, and may be determined according to practical situations, which is not particularly limited in the embodiments of the present application. It will be appreciated that in practical applications, there may be more sub-digital-to-analog conversion circuits in series, and corresponding control signals may also be increased. The number of the resistors which are conducted can be changed by controlling the high and low level of the control signal, so that different target adjustment multiples can be obtained, and the purpose of flexible adjustment is achieved.
FIG. 11 is a schematic diagram showing a conduction result of a DAC module according to an embodiment of the present application, as shown in FIG. 11, when the control signal b2, the control signal b1 and the control signal b0 are both high level signalsWhen the control signalControl signal->And control signal->All are at low level, and at this time, the resistor R23, the resistor R24 and the resistor R25 are all on, and the target value of the feedback resistor is r23+r22+r21.
The switching transistor may be a Metal-Oxide-Semiconductor field effect transistor (PMOS), a thin film transistor (Thin Film Transistor, TFT), or the like, which is not particularly limited in the embodiment of the present application.
It will be appreciated that the control signalIs the inverse of control signal b2, e.g. control signal b2 is high, control signal +.>Is low; control signal->Is the inverse of the control signal b1, e.g. the control signal b1 is high, the control signal +.>Is low; control signal->Is the inverse of the control signal b0, e.g. the control signal b0 is high, the control signal +.>Is low.
The following describes the specific operation of the adjustment operation module 30 to obtain the compensation voltage with reference to fig. 12:
The first sub-adjustment operation module 30A and the second DAC302 structure described above are exemplified.
Specifically, the non-inverting input terminal of the first operational amplifier 3011 is configured to receive the first power supply voltage VCOM1 of the display panel 10, the inverting input terminal of the first operational amplifier 3011 is connected to the resistor R1 and the capacitor C1, and is configured to receive the first feedback voltage vcom_fb1 of the display panel 10, the output terminal of the first operational amplifier 3011 is configured to output the compensation voltage vcom_in to the display panel 10, one end of the DAC302 is connected to the inverting input terminal of the operational amplifier, and the other end of the DAC302 is connected to the output terminal of the operational amplifier.
In the case of a general display problem, when the fluctuation of the first feedback voltage VCOM_FB1 is large, a large compensation is required at this time, and the control signals b2, b1 and b0 are all high level signals, which can be controlled by、/>And->All of which are low, the gate resistors R23, R24 and R25 are IN accordance with the compensation factor (r23+r22+r21)/R1, and the first operational amplifier 3011 forms the first compensation voltage vcom_in1 according to the gate resistor, and the peak value of the first compensation voltage vcom_in1 is relatively large, and the first operational amplifier 3011 outputs the first compensation voltage vcom_in1 to the display panel 10.
When the fluctuation of the feedback voltage vcom_fb is small, small compensation is performed, and when the fluctuation of the feedback voltage vcom_fb is small, the non-compensation process is similar to the above-mentioned large compensation process, and will not be repeated here. It will be appreciated that when the structure of the DAC302 is changed to that shown in fig. 8, the compensation process is also similar, and will not be repeated here.
The embodiment of the application also provides a compensation method which is applied to the public voltage compensation circuit and comprises the following steps:
the control module receives feedback voltage of the display panel and determines a fluctuation value according to the feedback voltage;
when the fluctuation value exceeds a certain preset value, the control module sends a target signal corresponding to the preset value to the adjustment operation module according to the first corresponding relation;
the adjusting operation module determines target compensation voltage according to the target signal and outputs the target compensation voltage to the display panel;
the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
As an alternative embodiment, the compensation method further comprises: when the display panel displays a preset picture, a time sequence controller in the control module outputs a polarity inversion signal to the waveform analysis module;
the waveform analysis module sends a first compensation multiple signal to the time sequence controller under the condition that the polarity inversion signal is at a high level after receiving the polarity inversion signal; or, in the case that the polarity inversion signal is at a high level, transmitting a second compensation multiple signal to the timing controller; or, in case that the polarity inversion signal is at a low level, transmitting a third preset signal to the timing controller;
the third preset signal is used for indicating the time sequence controller to receive the compensation multiple determined by the waveform analysis module, determining a group of control signals corresponding to the compensation multiple according to the compensation multiple, and sending the determined group of control signals to the adjustment operation module;
the time sequence controller determines a first target control signal according to the first compensation multiple signal and outputs the first target control signal to the adjustment operation module; or the time sequence controller determines a second target control signal according to the second compensation multiple signal and outputs the second target control signal to the adjustment operation module; or the time sequence controller outputs a determined group of control signals to the adjustment operation module;
The adjusting operation module does not gate the feedback resistor according to the first target control signal and does not output target compensation voltage to the display panel; or the adjusting operation module determines target compensation voltage according to one or more feedback resistors gated by the second target control signal and outputs the target compensation voltage to the display panel; or the adjusting operation module is used for determining a target compensation voltage by switching on one or more corresponding resistors according to the determined group of control signals and outputting the target compensation voltage to the display panel.
As an alternative embodiment, the first compensation factor is zero, and the second compensation factor is greater than zero and less than a preset compensation factor, the preset compensation factor being a minimum value of a plurality of different compensation factors.
The embodiment of the application also provides display equipment which comprises the public voltage compensation circuit and a display panel; the display panel is used for displaying images, outputting power supply voltage and feedback voltage to the adjusting operation module, and receiving compensation voltage output by the adjusting operation module.
The display panel may be a liquid crystal display (Liquid Crystal Ddisplay, LCD), an Organic Light-Emitting Diode (OLED), a Twisted Nematic (TN), a VA panel, or the like, which is not particularly limited in the embodiment of the present application.
In the description of the embodiments of the application, it should be understood that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Furthermore, in the present application, unless explicitly specified and limited otherwise, the terms "connected," "coupled," and the like are to be construed broadly and may be, for example, mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, unless otherwise specifically defined, the meaning of the terms in this disclosure is to be understood by those of ordinary skill in the art.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the 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. Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (9)

1. A common voltage compensation circuit, comprising: the control module and the regulation operation module are connected with each other;
The control module is used for receiving feedback voltage of the display panel, determining a fluctuation value according to the feedback voltage, and sending a target signal corresponding to a target preset value to the adjustment operation module according to a first corresponding relation when the fluctuation value exceeds the target preset value;
the adjusting operation module is used for determining a target compensation voltage according to the target signal and outputting the target compensation voltage to the display panel;
the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value;
the adjusting operation module comprises one or more sub-adjusting operation modules;
each sub-regulation operation module comprises a digital-to-analog conversion circuit and an operational amplifier;
the first end of the digital-to-analog conversion circuit is connected with the inverting input end of the operational amplifier, the second end of the digital-to-analog conversion circuit is connected with the output end of the operational amplifier, and the third end of the digital-to-analog conversion circuit is connected with the control module;
The digital-to-analog conversion circuit is used for receiving the target signal and determining a target value of a feedback resistor according to the target signal;
the operational amplifier is used for determining a target compensation voltage according to the target value of the feedback resistor and outputting the target compensation voltage to the display panel.
2. The common voltage compensation circuit of claim 1 wherein the control module comprises a waveform analysis module and a timing controller connected;
the waveform analysis module is used for receiving the feedback voltage, determining a fluctuation value according to the feedback voltage, and sending a target compensation multiple corresponding to the target preset value to the time sequence controller according to a first corresponding relation when the fluctuation value exceeds the target preset value;
the time sequence controller is used for determining the target signal according to the target compensation multiple and sending the target signal to the adjustment operation module.
3. The common voltage compensation circuit according to claim 1 or 2, wherein the fluctuation value is a difference between a first voltage and a second voltage; the first voltage is a voltage value of a feedback voltage when the display panel has a display problem; the second voltage is a voltage value of the feedback voltage when the display panel has no display problem; the display problem includes at least crosstalk or greenness.
4. The common voltage compensation circuit of claim 1 wherein the third terminal of the digital-to-analog conversion circuit comprises 2M control terminals, the digital-to-analog conversion circuit comprises N resistors and N switch modules, the N resistors are connected in series, each of the resistors is correspondingly connected to a first terminal of one of the switch modules, the second terminals of the N switch modules are connected together, and the N switch modules are further connected to the 2M control terminals; the N resistors are used for gating through the target signals received by the 2M control terminals and determining the target value of the feedback resistor, wherein N=2 M M is an integer greater than 1.
5. The common voltage compensation circuit of claim 1 wherein said digital-to-analog conversion circuit comprises a plurality of serially connected sub-digital-to-analog conversion circuits;
each sub digital-to-analog conversion circuit comprises a resistor, a first switching tube and a second switching tube;
the resistor is connected with the first switching tube in series, and the second switching tube is connected with the resistor and two ends of the first switching tube in parallel after being connected in series;
the plurality of serially connected sub digital-to-analog conversion circuits are used for gating according to the target signal and determining the target value of the feedback resistor.
6. A compensation method applied to the common voltage compensation circuit of any one of the preceding claims 1-5, the compensation method comprising:
the control module receives feedback voltage of the display panel and determines a fluctuation value according to the feedback voltage;
when the fluctuation value exceeds a target preset value, the control module sends a target signal corresponding to the target preset value to the adjustment operation module according to a first corresponding relation;
the adjusting operation module determines a target compensation voltage according to the target signal and outputs the target compensation voltage to the display panel;
the first corresponding relation is used for indicating one-to-one corresponding relation among a plurality of different preset values, a plurality of groups of different control signals and a plurality of different compensation multiples; the target preset value is one of a plurality of different preset values, and the target signal is a group of control signals corresponding to the target preset value.
7. The compensation method of claim 6, wherein the compensation method further comprises:
when the display panel displays a preset picture, a time sequence controller in the control module outputs a polarity inversion signal to the waveform analysis module;
The waveform analysis module sends a first compensation multiple signal to the time sequence controller under the condition that the polarity inversion signal is at a high level after receiving the polarity inversion signal; or, in the case that the polarity inversion signal is at a high level, transmitting a second compensation multiple signal to the timing controller; or, in case that the polarity inversion signal is at a low level, transmitting a third preset signal to the timing controller;
the third preset signal is used for indicating the time sequence controller to receive the target compensation multiple determined by the waveform analysis module, determining a group of control signals corresponding to the target compensation multiple according to the target compensation multiple, and sending the determined group of control signals to the adjustment operation module;
the time sequence controller determines a first target control signal according to the first compensation multiple signal and outputs the first target control signal to the adjustment operation module; or the time sequence controller determines a second target control signal according to the second compensation multiple signal and outputs the second target control signal to the adjustment operation module; or the timing controller outputs the determined set of control signals to the adjustment operation module;
The adjusting operation module does not gate a feedback resistor according to the first target control signal and does not output the target compensation voltage to the display panel; or the adjusting operation module determines the target compensation voltage according to one or more feedback resistors gated by the second target control signal and outputs the target compensation voltage to a display panel; or the adjusting operation module is used for determining a target compensation voltage by switching on one or more corresponding resistors according to the determined group of control signals and outputting the target compensation voltage to the display panel.
8. The compensation method of claim 7, wherein the first compensation factor is zero and the second compensation factor is greater than zero and less than a preset compensation factor, the preset compensation factor being a minimum of the plurality of different compensation factors.
9. A display device comprising a display panel and a common voltage compensation circuit as claimed in any one of the preceding claims 1-5;
the display panel is used for displaying images, outputting power supply voltage and feedback voltage to the common voltage compensation circuit, and receiving compensation voltage output by the common voltage compensation circuit.
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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080012674A (en) * 2006-08-04 2008-02-12 엘지.필립스 엘시디 주식회사 Lcd and drive method thereof
CN102106080A (en) * 2009-04-01 2011-06-22 罗姆股份有限公司 Liquid crystal driving apparatus
CN104050942A (en) * 2014-06-10 2014-09-17 京东方科技集团股份有限公司 Common voltage driver compensation unit and method and display panel
CN104680997A (en) * 2015-03-16 2015-06-03 京东方科技集团股份有限公司 VCOM compensation circuit and display device
CN105513527A (en) * 2016-02-03 2016-04-20 京东方科技集团股份有限公司 Common voltage compensation circuit, compensation method and display panel
CN106782397A (en) * 2017-01-03 2017-05-31 京东方科技集团股份有限公司 The compensation method of display panel and its common electric voltage, display device
CN107799082A (en) * 2017-11-16 2018-03-13 深圳市华星光电技术有限公司 A kind of common electric voltage VCOM control circuits and corresponding liquid crystal display device
CN215220228U (en) * 2021-06-30 2021-12-17 惠科股份有限公司 Display device and common voltage compensation circuit
CN114070313A (en) * 2021-11-19 2022-02-18 苏州国芯科技股份有限公司 Signal processing system and multi-channel digital-to-analog conversion equipment thereof
CN116153223A (en) * 2023-01-31 2023-05-23 惠科股份有限公司 Method and device for compensating common voltage of display panel, display device and medium
CN116312406A (en) * 2023-01-31 2023-06-23 惠科股份有限公司 Common voltage compensation circuit and display device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI286306B (en) * 2003-11-21 2007-09-01 Au Optronics Corp Device and method for reducing the aberration of the gamma curvature

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080012674A (en) * 2006-08-04 2008-02-12 엘지.필립스 엘시디 주식회사 Lcd and drive method thereof
CN102106080A (en) * 2009-04-01 2011-06-22 罗姆股份有限公司 Liquid crystal driving apparatus
CN104050942A (en) * 2014-06-10 2014-09-17 京东方科技集团股份有限公司 Common voltage driver compensation unit and method and display panel
CN104680997A (en) * 2015-03-16 2015-06-03 京东方科技集团股份有限公司 VCOM compensation circuit and display device
CN105513527A (en) * 2016-02-03 2016-04-20 京东方科技集团股份有限公司 Common voltage compensation circuit, compensation method and display panel
CN106782397A (en) * 2017-01-03 2017-05-31 京东方科技集团股份有限公司 The compensation method of display panel and its common electric voltage, display device
CN107799082A (en) * 2017-11-16 2018-03-13 深圳市华星光电技术有限公司 A kind of common electric voltage VCOM control circuits and corresponding liquid crystal display device
CN215220228U (en) * 2021-06-30 2021-12-17 惠科股份有限公司 Display device and common voltage compensation circuit
CN114070313A (en) * 2021-11-19 2022-02-18 苏州国芯科技股份有限公司 Signal processing system and multi-channel digital-to-analog conversion equipment thereof
CN116153223A (en) * 2023-01-31 2023-05-23 惠科股份有限公司 Method and device for compensating common voltage of display panel, display device and medium
CN116312406A (en) * 2023-01-31 2023-06-23 惠科股份有限公司 Common voltage compensation circuit and display device

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