CN109285518B - Compensation circuit of display panel and display panel - Google Patents
Compensation circuit of display panel and display panel Download PDFInfo
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- CN109285518B CN109285518B CN201811347003.7A CN201811347003A CN109285518B CN 109285518 B CN109285518 B CN 109285518B CN 201811347003 A CN201811347003 A CN 201811347003A CN 109285518 B CN109285518 B CN 109285518B
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- 239000004973 liquid crystal related substance Substances 0.000 abstract description 4
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention relates to a compensation circuit of a display panel, comprising: the output module is used for outputting a first digital voltage; the digital-to-analog conversion module is connected with the output module and used for receiving the first digital voltage and outputting a first analog voltage, and the first analog voltage is used for providing a common voltage for the display panel; the analog-to-digital conversion module is used for receiving the first analog voltage and outputting a second digital voltage; the compensation module is used for outputting a compensation control signal according to the first digital voltage and the second digital voltage, the compensation control signal is the compensated and corrected first digital voltage, and the corrected first digital voltage can correct the public voltage drop caused by the rear end back to a set value through the digital-to-analog conversion module. Therefore, the problem that the common voltage output by the compensation circuit of the traditional display panel is reduced due to different internal impedance and liquid crystal display pictures is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a compensation circuit of a display panel and the display panel.
Background
The liquid crystal panel is divided into an array layer at the lower layer and a common electrode at the upper layer, the driving voltage of the common electrode at the upper layer is called as a common voltage, the current of the common electrode is increasingly loaded along with the increasing of the resolution and the increasing of the size of the liquid crystal panel, and meanwhile, the current is more and more increased due to the existence of the internal impedance of the compensation circuit of the display panel, and the output common voltage is more and more reduced.
The common voltage is also affected by the array layer, which is used to transmit the data of the display screen, and the common voltage also has a certain degree of deviation with the difference of the display screen.
Disclosure of Invention
The invention aims to provide a compensation circuit of a display panel and the display panel, which can effectively compensate common voltage drift.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a compensation circuit of a display panel, comprising:
the output module is used for outputting a first digital voltage;
the digital-to-analog conversion module is connected with the output module, the input end of the digital-to-analog conversion module receives the first digital voltage and outputs a first analog voltage through the output end of the digital-to-analog conversion module, and the first analog voltage is used for providing a common voltage for the display panel;
the analog-to-digital conversion module is connected with the digital-to-analog conversion module, and the input end of the analog-to-digital conversion module receives the first analog voltage and outputs a second digital voltage through the output end of the analog-to-digital conversion module;
the input end of the compensation module is connected with the output ends of the output module and the analog-to-digital conversion module, the output end of the compensation module is connected with the input end of the digital-to-analog conversion module and used for outputting a compensation control signal according to the first digital voltage and the second digital voltage, and the compensation control signal is the first digital voltage corrected through compensation.
In one embodiment, the compensation module comprises:
the input end of the difference calculating module is connected with the output ends of the output module and the analog-to-digital conversion module, and is used for acquiring a voltage difference value between the first digital voltage output by the output module and the second digital voltage output by the output end of the analog-to-digital conversion module and outputting the voltage difference value through the output end of the difference calculating module;
the input end of the summing module is connected with the output end of the output module and the output end of the difference calculating module, the output end of the summing module is connected with the input end of the digital-to-analog conversion module, and the summing module is used for superposing the first digital voltage output by the output module and the voltage difference output by the output end of the difference calculating module to obtain a third digital voltage and outputting the third digital voltage through the output end of the summing module.
In one embodiment, the method further comprises the following steps:
the input end of the driving module is connected with the output end of the digital-to-analog conversion module, the input end of the driving module is used for receiving the first analog voltage, the output end of the driving module outputs a second analog voltage, and the second analog voltage is used for providing a common voltage for the display panel;
and the output end of the driving module is connected with the input end of the analog-to-digital conversion module.
In one embodiment, the output module comprises:
and the storage module is used for storing the first digital voltage.
In one embodiment, the output module further comprises:
a control unit for outputting a control signal, the control signal including the first digital voltage.
In one embodiment, the control unit is a micro-processing unit, and the control signal includes a clock signal and a first digital voltage.
In one embodiment, the difference module comprises a first amplifier, a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor is connected with the output module, and the second end of the first resistor is connected with the negative phase input end of the first amplifier;
the first end of the second resistor is connected with the output end of the analog-to-digital conversion module, and the second end of the second resistor is connected with the positive phase input end of the first amplifier;
the first end of the third resistor is connected with the non-inverting input end of the first amplifier, and the second end of the third resistor is grounded;
a first end of the fourth resistor is connected with a negative phase input end of the first amplifier, and a second end of the fourth resistor is connected with an output end of the first amplifier;
the input end of the summation module is connected with the output end of the output module and the output end of the first amplifier, and the output end of the summation module is connected with the input end of the digital-to-analog conversion module.
In one embodiment, the summing module comprises a second amplifier, a fifth resistor, a sixth resistor, and a seventh resistor;
a first end of the fifth resistor is connected with the output module, and a second end of the fifth resistor is connected with a negative phase input end of the second amplifier;
a first end of the sixth resistor is connected with the output end of the first amplifier, and a second end of the sixth resistor is connected with the negative phase input end of the second amplifier;
a first end of the seventh resistor is connected with a negative phase input end of the second amplifier, and a second end of the seventh resistor is connected with an output end of the second amplifier;
the non-inverting input end of the second amplifier is grounded;
and the output end of the second amplifier is connected with the input end of the digital-to-analog conversion module.
In order to realize the purpose of the invention, the invention also adopts the following technical scheme:
a compensation circuit of a display panel, comprising:
a storage module for storing a first digital voltage;
the digital-to-analog conversion module is connected with the storage module, and the input end of the digital-to-analog conversion module receives the first digital voltage and outputs a first analog voltage through the output end of the digital-to-analog conversion module;
the input end of the driving module is connected with the output end of the digital-to-analog conversion module, the input end of the driving module is used for receiving the first analog voltage, the output end of the driving module outputs a second analog voltage, and the second analog voltage is used for providing a common voltage for the display panel;
the analog-to-digital conversion module is connected with the driving module, and the input end of the analog-to-digital conversion module receives the second analog voltage and outputs a second digital voltage through the output end of the analog-to-digital conversion module;
the input end of the difference calculating module is connected with the output ends of the storage module and the analog-to-digital conversion module, and is used for acquiring a voltage difference value between the first digital voltage output by the storage module and the second digital voltage output by the output end of the analog-to-digital conversion module and outputting the voltage difference value through the output end of the difference calculating module;
the input end of the summing module is connected with the output ends of the storage module and the difference calculating module, the output end of the summing module is connected with the input end of the digital-to-analog conversion module, and the summing module is used for superposing the first digital voltage output by the storage module and the voltage difference output by the output end of the difference calculating module to obtain a third digital voltage and outputting the third digital voltage through the output end of the summing module.
In order to achieve the object of the present invention, the present invention also provides a display panel:
a display panel comprises the compensation circuit of the display panel.
The compensation circuit of the display panel is additionally provided with an analog-to-digital conversion module and a compensation module on the basis of the traditional compensation circuit of the display panel, wherein the analog-to-digital conversion module converts a first analog voltage provided for the display panel into a second digital voltage; the input end of the compensation module is connected with the output ends of the output module and the analog-to-digital conversion module, the output end of the compensation module is connected with the input end of the digital-to-analog conversion module and is used for outputting a compensation control signal according to a first digital voltage and a second digital voltage, the compensation control signal is the compensated and corrected first digital voltage, the compensated first digital voltage passes through the digital-to-analog conversion module, and then the public voltage drop caused by the rear end can be corrected back to a set value, so that the problem that the first digital voltage output by the output module in the compensation circuit of the traditional display panel outputs the first analog voltage through the digital-to-analog conversion module is solved, the output first analog voltage (public voltage) drops due to the existence of the internal impedance of the module, and the current pumping capacity of the compensation circuit of the display panel is increased due to the higher resolution of the current display panel and larger size, resulting in a problem that the common voltage drops more quickly.
Drawings
FIG. 1 is a schematic diagram of a compensation circuit of a display panel according to an embodiment;
FIG. 2 is a schematic diagram of a compensation module according to an embodiment;
FIG. 3 is a schematic diagram of a compensation circuit of a display panel according to another embodiment;
FIG. 4 is a circuit diagram of a differencing module in one embodiment;
FIG. 5 is a circuit schematic of a summing block in one embodiment;
FIG. 6 is a schematic diagram of a compensation circuit of a display panel according to still another embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a compensation circuit of a display panel according to an embodiment.
A compensation circuit 10 of a display panel, comprising:
an output module 100 for outputting a first digital voltage U1;
a digital-to-analog conversion module 120 connected to the output module 100, wherein an input end of the digital-to-analog conversion module 120 receives the first digital voltage U1 and outputs a first analog voltage V1 through an output end of the digital-to-analog conversion module, and the first analog voltage V1 is used for providing a common voltage for the display panel 20;
the analog-to-digital conversion module 130 is connected with the digital-to-analog conversion module 120, and an input end of the analog-to-digital conversion module 130 receives the first analog voltage V1 and outputs a second digital voltage U2 through an output end of the analog-to-digital conversion module;
the input end of the compensation module 110 is connected to the output ends of the output module 100 and the analog-to-digital conversion module 130, the output end of the compensation module 100 is connected to the input end of the digital-to-analog conversion module 120, and is configured to output a compensation control signal U3 according to the first digital voltage U1 and the second digital voltage U2, where the compensation control signal U3 is a compensation modified first digital voltage U1.
The compensation circuit 10 of the display panel is added with an analog-to-digital conversion module 130 and a compensation module 110 on the basis of the conventional compensation circuit 10 of the display panel, wherein the analog-to-digital conversion module 130 converts the first analog voltage V1 provided to the display panel 20 into the second digital voltage U2, and the analog-to-digital conversion module 130 may be an analog-to-digital converter; the input end of the compensation module 110 is connected to the output ends of the output module 100 and the analog-to-digital conversion module 130, the output end of the compensation module 110 is connected to the input end of the digital-to-analog conversion module 120, and is configured to output a compensation control signal U3 according to the first digital voltage U1 and the second digital voltage U2, the compensation control signal U3 is the compensated and corrected first digital voltage U1, the compensated first digital voltage U1 passes through the digital-to-analog conversion module 120, and the common voltage drop caused by the rear end can be corrected back to a set value, thereby solving the problem that the first digital voltage U1 output by the output module 100 in the compensation circuit 10 of the conventional display panel outputs the first analog voltage V1 through the digital-to-analog conversion module 120, and the output first analog voltage V1 (common voltage) drops due to the existence of the internal impedance of the module, and the problem that the resolution of the display panel 20 is higher and the size is larger, and thus the current draw of the compensation circuit 10 of the display panel becomes large, resulting in a problem that the common voltage drops more quickly.
In this embodiment, referring to fig. 2, fig. 2 is a schematic structural diagram of the compensation module 110 in an embodiment, where the compensation module 110 includes:
a difference module 1101, an input end of the difference module 1101 being connected to the output ends of the output module 100 and the analog-to-digital conversion module 130, configured to obtain a voltage difference Δ U between a first digital voltage U1 output by the output module 100 and a second digital voltage U2 output by the output end of the analog-to-digital conversion module 130, and output the voltage difference Δ U through an output end of the difference module 11;
the input end of the summing module 1102 is connected to the output ends of the output module 100 and the difference calculating module 1101, the output end of the summing module 1102 is connected to the input end of the digital-to-analog conversion module 120, and the summing module 1102 is configured to superimpose the first digital voltage U1 output by the output module 100 and the voltage difference Δ U output by the output end of the difference calculating module 1101 to obtain a third digital voltage U3, and output the third digital voltage U3 through the output end of the summing module 1102.
In this embodiment, the compensation module 110 includes a difference module 1101 and a summation module 1102, where the difference module 1101 may be a subtractor, and the summation module 1102 may be an adder, and the operation principle thereof is as follows: the first digital voltage U1 output by the output module 100 passes through the digital-to-analog conversion module 120, and the digital-to-analog conversion module 120 converts the first digital voltage U1 into the first analog voltage V1, the present invention adopts the analog-to-digital conversion module 130 to convert the first analog voltage V1 into the second digital voltage U2, the difference module 1101 calculates the difference between the collected first digital voltage U1 and the collected second digital voltage U2 to obtain the voltage difference Δ U, the summation module 1102 sums the collected first digital voltage U1 and the voltage difference Δ U to obtain the third digital voltage U3, the third digital voltage U3 is the compensated and corrected first digital voltage U1, the corrected first digital voltage U1 passes through the digital-to-analog conversion module 120, and the common voltage drop caused by the rear end can be corrected back to the set value, and the digital-to-analog conversion module 120 can be a digital-to-analog converter.
Further, referring to fig. 3, fig. 3 is a schematic structural diagram of a compensation circuit 10 of a display panel in another embodiment, where the compensation circuit 10 of the display panel further includes:
the driving module 140, an input end of the driving module 140 is connected to an output end of the digital-to-analog conversion module 120, an input end of the driving module 140 is configured to receive the first analog voltage V1, an output end of the driving module 140 outputs a second analog voltage V2, and the second analog voltage V2 is configured to provide a common voltage for the display panel 20;
an output of the driving module 140 is connected to an input of the analog-to-digital conversion module 130.
Since the first analog voltage V1 generated by the digital-to-analog conversion module 120 is the common voltage provided to the display panel 20, the common voltage has a small driving capability, and the added driving module, which may be a current amplifier, ensures that a current of more than 100mA is output, and enhances the output capability of the common voltage.
In one embodiment, the output module 100 includes:
and a storage module for storing the first digital voltage U1, wherein the storage module may be a memory.
Further, the output module 100 further includes:
and the control unit is used for outputting a control signal, and the control signal comprises a first digital voltage U1.
Specifically, the control unit is a micro-processing unit, and the control signal includes a clock signal and a first digital voltage.
The output module 100 includes a memory module or a control unit, when the output module 100 includes the memory module, the first digital voltage U1 needs to be stored in the memory module, and when the common voltage V1 needs to be provided for the display panel 20 for normal operation, the first digital voltage U1 in the memory module needs to be retrieved, and converted into the first analog voltage V1 through the digital-to-analog conversion module 120, so as to provide the common voltage V1 for the display panel 20; when the output module 100 includes a control unit, the control unit is connected to the digital-to-analog conversion module 120 via the interface bus, and is configured to provide a control signal to the digital-to-analog conversion module 120, where the control signal includes a clock signal and a first digital voltage U1 signal. The control unit can be a microprocessor and comprises a clock end and a data end, wherein the clock end is used for sending a clock signal; the data terminal is used for sending a first digital voltage U1 signal, the medium bus is a two-wire serial bus, and the two-wire serial bus comprises a clock terminal and a data terminal, so that synchronous data communication is realized.
Specifically, referring to fig. 4, fig. 4 is a circuit schematic diagram of a difference module 1101 in an embodiment, where the difference module 1101 includes a first amplifier a1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
a first end of the first resistor R1 is connected with the output module 100, and a second end of the first resistor R1 is connected with a negative phase input end of the first amplifier A1;
a first end of the second resistor R2 is connected to the output end of the analog-to-digital conversion module 130, and a second end of the second resistor R2 is connected to the non-inverting input end of the first amplifier a 1;
a first end of the third resistor R3 is connected with a non-inverting input end of the first amplifier A1, and a second end of the third resistor R3 is grounded;
a first end of the fourth resistor R4 is connected to the negative input terminal of the first amplifier a1, and a second end of the fourth resistor R4 is connected to the output terminal of the first amplifier a 1;
the input terminal of the summing module 1102 is connected to the output terminal of the output module 100 and the first amplifier a1, and the output terminal of the summing module 1102 is connected to the input terminal of the digital-to-analog conversion module 120.
Specifically, referring to fig. 5, fig. 5 is a circuit schematic diagram of the summing module 1102 in an embodiment, the summing module 1102 includes a second amplifier a2, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7;
a first end of the fifth resistor R5 is connected with the output module 100, and a second end of the fifth resistor R5 is connected with the negative phase input end of the second amplifier A2;
a first end of the sixth resistor R6 is connected to the output end of the first amplifier a1, and a second end of the sixth resistor R6 is connected to the negative input end of the second amplifier a 2;
a first end of the seventh resistor R7 is connected with the negative phase input end of the second amplifier A2, and a second end of the seventh resistor R7 is connected with the output end of the second amplifier A2;
the non-inverting input of the second amplifier a2 is grounded;
the output of the second amplifier a2 is connected to the input of the digital to analog conversion module 120.
In order to realize the purpose of the invention, the invention also adopts the following technical scheme:
referring to fig. 6, fig. 6 is a schematic structural diagram of a compensation circuit 10 of a display panel according to another embodiment, including:
a storage module 101 for storing a first digital voltage U1;
the digital-to-analog conversion module 120 is connected to the storage module 101, and an input end of the digital-to-analog conversion module 120 receives the first digital voltage U1 and outputs a first analog voltage V1 through an output end of the digital-to-analog conversion module 120;
the driving module 140, an input end of the driving module 140 is connected to an output end of the digital-to-analog conversion module 120, an input end of the driving module 140 is configured to receive the first analog voltage V1, an output end of the driving module 140 outputs a second analog voltage V2, and the second analog voltage V2 is configured to provide a common voltage for the display panel 20;
the analog-to-digital conversion module 130 is connected to the driving module 140, and an input end of the analog-to-digital conversion module 130 receives the second analog voltage V2 and outputs a second digital voltage U2 through an output end of the analog-to-digital conversion module 130;
the difference calculating module 1101, an input end of the difference calculating module 1101 is connected to the output ends of the storage module 101 and the analog-to-digital conversion module 130, and is configured to obtain a voltage difference value Δ U between a first digital voltage U1 output by the storage module 101 and a second digital voltage U2 output by the output end of the analog-to-digital conversion module 130, and output the voltage difference value Δ U through the output end of the difference calculating module 1101;
the input end of the summing module 1102 is connected to the output ends of the storage module 101 and the difference calculating module 1101, the output end of the summing module 1102 is connected to the input end of the digital-to-analog conversion module 120, and the summing module 1102 is configured to superimpose the first digital voltage U1 output by the storage module 101 and the voltage difference value Δ U output by the output end of the difference calculating module 1101 to obtain a third digital voltage U3, and output the third digital voltage U3 through the output end of the summing module 1102.
The compensation circuit 10 of the display panel is added with the analog-to-digital conversion module 130, the difference module 1101 and the summation module 1102 on the basis of the conventional compensation circuit 10 of the display panel, and the working principle is as follows: the first digital voltage U1 output by the storage module 101 passes through the digital-to-analog conversion module 120, the digital-to-analog conversion module 120 converts the first digital voltage U1 into a first analog voltage V1, the first analog voltage V1 outputs a second analog voltage V2 through the driving module 140, the analog-to-digital conversion module 130 converts the first analog voltage V2 into a second digital voltage U2, the difference module 1101 subtracts the collected first digital voltage U1 and the collected second digital voltage U2 to obtain a voltage difference value Δ U, the summation module 1102 sums the collected first digital voltage U1 and the voltage difference value Δ U to obtain a third digital voltage U3, the third digital voltage U3 is the compensated and corrected first digital voltage U1, the corrected first digital voltage U1 passes through the digital-to-analog conversion module 120 to correct the common voltage drop caused by the rear end back to a set value, thereby solving the problem of the first digital voltage U1 output by the compensation module 101 in the compensation circuit 10 of the conventional display panel, the first analog voltage V1 is output through the dac module 120, and due to the existence of the internal impedance of the module, the output first analog voltage V1 (common voltage) decreases, and at the same time, because the current resolution of the display panel 20 is higher and the size is larger, the current pumping of the compensation circuit 10 of the display panel increases, which results in a faster decrease of the common voltage.
In order to achieve the object of the present invention, the present invention also provides a display panel:
a display panel comprises the compensation circuit 10 of the display panel.
The display panel comprises the compensation circuit 10 of the display panel, which effectively ensures that the common voltage provided by the compensation circuit 10 of the display panel to the display panel 20 is kept unchanged, and eliminates the influence of the common voltage output by the compensation circuit of the traditional display panel, which is reduced due to different internal impedances and liquid crystal display pictures.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A compensation circuit for a display panel, comprising:
an output module for outputting a first digital voltage, the output module comprising:
a storage module for storing the first digital voltage;
a control unit for outputting a control signal, the control signal including the first digital voltage;
the digital-to-analog conversion module is connected with the output module, the input end of the digital-to-analog conversion module receives the first digital voltage and outputs a first analog voltage through the output end of the digital-to-analog conversion module, and the first analog voltage is used for providing a common voltage for the display panel;
the input end of the driving module is connected with the output end of the digital-to-analog conversion module, the output end of the driving module is connected with the input end of the analog-to-digital conversion module, the input end of the driving module is used for receiving the first analog voltage, the output end of the driving module outputs a second analog voltage, and the second analog voltage is used for providing a common voltage for the display panel, wherein the driving module is a current amplifier;
the analog-to-digital conversion module is connected with the driving module, the input end of the analog-to-digital conversion module receives the second analog voltage and outputs a second digital voltage through the output end of the analog-to-digital conversion module, and the analog-to-digital conversion module is an analog-to-digital converter;
the input end of the difference calculating module is connected with the output ends of the storage module and the analog-to-digital conversion module, and is used for acquiring a voltage difference value between the first digital voltage output by the output module and the second digital voltage output by the output end of the analog-to-digital conversion module and outputting the voltage difference value through the output end of the difference calculating module;
the input end of the summing module is connected with the output ends of the output module and the difference calculating module, the output end of the summing module is connected with the input end of the digital-to-analog conversion module, and the summing module is used for superposing the first digital voltage output by the output module and the voltage difference value output by the output end of the difference calculating module to obtain a third digital voltage and outputting the third digital voltage through the output end of the summing module;
the input end of the compensation module is connected with the output ends of the output module and the analog-to-digital conversion module, the output end of the compensation module is connected with the input end of the digital-to-analog conversion module and used for outputting a compensation control signal according to the first digital voltage and the second digital voltage, and the compensation control signal is the first digital voltage corrected through compensation.
2. The compensation circuit of claim 1, wherein the control unit is a micro-processing unit, and the control signal comprises a clock signal and a first digital voltage.
3. The compensation circuit of claim 1, wherein the difference module comprises a first amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor;
the first end of the first resistor is connected with the output module, and the second end of the first resistor is connected with the negative phase input end of the first amplifier;
the first end of the second resistor is connected with the output end of the analog-to-digital conversion module, and the second end of the second resistor is connected with the positive phase input end of the first amplifier;
the first end of the third resistor is connected with the non-inverting input end of the first amplifier, and the second end of the third resistor is grounded;
a first end of the fourth resistor is connected with a negative phase input end of the first amplifier, and a second end of the fourth resistor is connected with an output end of the first amplifier;
the input end of the summation module is connected with the output end of the output module and the output end of the first amplifier, and the output end of the summation module is connected with the input end of the digital-to-analog conversion module.
4. The compensation circuit of claim 3, wherein the summing module comprises a second amplifier, a fifth resistor, a sixth resistor, and a seventh resistor;
a first end of the fifth resistor is connected with the output module, and a second end of the fifth resistor is connected with a negative phase input end of the second amplifier;
a first end of the sixth resistor is connected with the output end of the first amplifier, and a second end of the sixth resistor is connected with the negative phase input end of the second amplifier;
a first end of the seventh resistor is connected with a negative phase input end of the second amplifier, and a second end of the seventh resistor is connected with an output end of the second amplifier;
the non-inverting input end of the second amplifier is grounded;
and the output end of the second amplifier is connected with the input end of the digital-to-analog conversion module.
5. A compensation circuit for a display panel, comprising:
a storage module for storing a first digital voltage;
a control unit for outputting a control signal, the control signal including the first digital voltage; the digital-to-analog conversion module is connected with the storage module, and the input end of the digital-to-analog conversion module receives the first digital voltage and outputs a first analog voltage through the output end of the digital-to-analog conversion module;
the input end of the driving module is connected with the output end of the digital-to-analog conversion module, the input end of the driving module is used for receiving the first analog voltage, the output end of the driving module outputs a second analog voltage, and the second analog voltage is used for providing a common voltage for the display panel, wherein the driving module is a current amplifier;
the analog-to-digital conversion module is connected with the driving module, the input end of the analog-to-digital conversion module receives the second analog voltage and outputs a second digital voltage through the output end of the analog-to-digital conversion module, and the analog-to-digital conversion module is an analog-to-digital converter;
the input end of the difference calculating module is connected with the output ends of the storage module and the analog-to-digital conversion module, and is used for acquiring a voltage difference value between the first digital voltage output by the storage module and the second digital voltage output by the output end of the analog-to-digital conversion module and outputting the voltage difference value through the output end of the difference calculating module;
the input end of the summing module is connected with the output ends of the storage module and the difference calculating module, the output end of the summing module is connected with the input end of the digital-to-analog conversion module, and the summing module is used for superposing the first digital voltage output by the storage module and the voltage difference output by the output end of the difference calculating module to obtain a third digital voltage and outputting the third digital voltage through the output end of the summing module.
6. A display panel comprising the compensation circuit of the display panel according to any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347003.7A CN109285518B (en) | 2018-11-13 | 2018-11-13 | Compensation circuit of display panel and display panel |
| PCT/CN2018/121787 WO2020098056A1 (en) | 2018-11-13 | 2018-12-18 | Compensation circuit of display panel, and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811347003.7A CN109285518B (en) | 2018-11-13 | 2018-11-13 | Compensation circuit of display panel and display panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109285518A CN109285518A (en) | 2019-01-29 |
| CN109285518B true CN109285518B (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811347003.7A Active CN109285518B (en) | 2018-11-13 | 2018-11-13 | Compensation circuit of display panel and display panel |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109285518B (en) |
| WO (1) | WO2020098056A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119863986A (en) * | 2025-02-28 | 2025-04-22 | 合肥维信诺科技有限公司 | Driving method, display device, and computer storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI353577B (en) * | 2006-10-26 | 2011-12-01 | Novatek Microelectronics Corp | Voltage conversion device having non-linear gain a |
| CN101655687B (en) * | 2008-08-20 | 2011-11-09 | 鸿富锦精密工业（深圳）有限公司 | Calibration system of voltage error |
| CN103841712B (en) * | 2012-11-27 | 2015-09-09 | 中国科学院沈阳自动化研究所 | A kind of LED light source control system and method |
| CN106873688B (en) * | 2017-04-26 | 2017-12-29 | 深圳市华星光电技术有限公司 | Time schedule controller input voltage control system and control method |
| CN107437407B (en) * | 2017-08-11 | 2020-06-02 | 昆山龙腾光电股份有限公司 | Common voltage generating circuit and liquid crystal display device |
| CN107578752B (en) * | 2017-09-20 | 2019-07-05 | 京东方科技集团股份有限公司 | Common voltage calibration circuit, circuit board and display device |
| CN107680546B (en) * | 2017-09-28 | 2020-06-05 | 深圳市华星光电技术有限公司 | Compensation delay circuit and display device |
| CN108182922B (en) * | 2018-01-09 | 2020-08-04 | 昆山龙腾光电股份有限公司 | Common voltage adjusting device, adjusting method and liquid crystal display device |
-
2018
- 2018-11-13 CN CN201811347003.7A patent/CN109285518B/en active Active
- 2018-12-18 WO PCT/CN2018/121787 patent/WO2020098056A1/en not_active Ceased
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| Publication number | Publication date |
|---|---|
| WO2020098056A1 (en) | 2020-05-22 |
| CN109285518A (en) | 2019-01-29 |
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