CN105513527A - Common voltage compensation circuit, compensation method and display panel - Google Patents
Common voltage compensation circuit, compensation method and display panel Download PDFInfo
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- CN105513527A CN105513527A CN201610076590.5A CN201610076590A CN105513527A CN 105513527 A CN105513527 A CN 105513527A CN 201610076590 A CN201610076590 A CN 201610076590A CN 105513527 A CN105513527 A CN 105513527A
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- 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
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Abstract
The invention discloses a common voltage compensation circuit, a compensation method and a display panel. A comparison module in the common voltage compensation circuit generates threshold voltage, a signal at the feedback signal end is compared with the threshold voltage, and a comparison result is output to the first input end and the second input end of a control module. The control module generates corresponding control signals according to the comparison result output by the comparison module. Under control of the corresponding control signals, an output module generates corresponding compensation signals according to a signal at the common voltage signal end and the signal at the feedback signal end and outputs the compensation signals. By comparing the signal at the feedback signal end with the threshold voltage through the comparison module and generating the corresponding control signals according to the comparison result, the corresponding compensation signals are generated according to the corresponding control signals and output, compensating of fluctuation situation of the common voltage signal is achieved, and accordingly spike voltage of fluctuation of the common voltage signal can be quickly and effectively compensated for.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of common electric voltage compensating circuit, compensation method and display panel.
Background technology
At present, in existing display device, when showing different pictures, the fluctuating range of the public voltage signal in display panel is different, and the increase of electric capacity along with transistor in display panel, pixel voltage also can increase the impact of common electric voltage, if common electric voltage fluctuation can not effectively be offset, then the display frame of display panel can be caused to occur the bad phenomenon of such as general green glow, in order to improve the problems referred to above, usually, need to arrange common electric voltage compensating circuit in a display device.
In prior art, the general common electric voltage compensating circuit of fixing feedback multiple that adopts compensates common electric voltage, to eliminate the fluctuation of common electric voltage, but the common electric voltage compensating circuit of fixing feedback multiple can not be made fast the peak voltage of common electric voltage fluctuation and effectively compensate, and then have impact on the quality of display frame of display panel, reduce the visual effect of display frame.
Therefore, how realizing compensating fast and effectively the peak voltage of common electric voltage fluctuation, is those skilled in the art's technical matterss urgently to be resolved hurrily.
Summary of the invention
Embodiments provide a kind of common electric voltage compensating circuit, compensation method and display panel, can not make fast and the effective problem compensated the peak voltage of common electric voltage fluctuation in order to the common electric voltage compensating circuit solving the fixing feedback multiple existed in prior art.
Embodiments provide a kind of common electric voltage compensating circuit, comprising: comparison module, control module and output module; Wherein,
The first input end of described comparison module is connected with the first power supply signal end, second input end is connected with second source signal end, 3rd input end is connected with feedback signal terminal, first output terminal is connected with the first input end of described control module, and the second output terminal is connected with the second input end of described control module; Described comparison module is used for generating threshold voltage according to the signal of described first power supply signal end and described second source signal end, and the signal of described feedback signal terminal and described threshold voltage are compared, and comparative result is outputted to respectively first input end and second input end of described control module;
First output terminal of described control module is connected with the first control end of described output module, and the second output terminal is connected with the second control end of described output module, and the 3rd output terminal is connected with the 3rd control end of described output module; The comparative result that described control module is used for exporting according to described comparison module generates corresponding control signal and outputs to the first control end of described output module, the second control end and the 3rd control end respectively;
The first input end of described output module is connected with public voltage signal end, and the second input end is connected with described feedback signal terminal, and output terminal is for exporting compensation voltage signal; Described output module is used under the control of described first control end, described second control end and described 3rd control end, and the signal according to described public voltage signal end and described feedback signal terminal generates corresponding compensating signal and exports.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described output module specifically comprises: the first switching transistor, second switch transistor, the 3rd switching transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the first operational amplifier; Wherein,
The grid of described first switching transistor is connected with the first output terminal of described control module, and source electrode is connected with described public voltage signal end one end with described first resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The grid of described second switch transistor is connected with the second output terminal of described control module, and source electrode is connected with one end of described second resistance with the other end of described first resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The grid of described 3rd switching transistor is connected with the 3rd output terminal of described control module, and source electrode is connected with one end of described 3rd resistance with the other end of described second resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The other end of described 3rd resistance is connected with described second source signal end;
One end of described first electric capacity is connected with described feedback signal terminal, and the other end is connected with one end of described 4th resistance;
The other end of described 4th resistance is connected with the negative input of described first operational amplifier with one end of described 5th resistance respectively;
The other end of described 5th resistance is connected with the output terminal of described first operational amplifier.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described control module specifically comprises: the first not gate, the second not gate, the 3rd not gate, first and door, second and door and the 3rd and door; Wherein,
The input end of described first not gate is connected with the second output terminal of described comparison module, and output terminal is connected with the first input end of door with described first;
The input end of described second not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the second input end of door with described first;
Described first is connected with the grid of described first switching transistor with the output terminal of door;
The described input end of the 3rd not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with described second;
Described second is connected with the second output terminal of described comparison module with the second input end of door, and output terminal is connected with the grid of described second switch transistor;
Described 3rd is connected with the first output terminal of described comparison module with the first input end of door, and the second input end is connected with the second output terminal of described comparison module, and output terminal is connected with the grid of described 3rd switching transistor.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described output module specifically comprises: the 4th switching transistor, the 5th switching transistor, the 6th switching transistor, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the second electric capacity and the second operational amplifier; Wherein,
The described grid of the 4th switching transistor is connected with the first output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 6th resistance;
The other end of described 6th resistance is connected with the output terminal of described second operational amplifier;
The described grid of the 5th switching transistor is connected with the second output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 7th resistance;
The other end of described 7th resistance is connected with the output terminal of described second operational amplifier;
The grid of described 6th switching transistor is connected with the 3rd output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 8th resistance;
The other end of described 8th resistance is connected with the output terminal of described second operational amplifier;
One end of described second electric capacity is connected with described feedback signal terminal, and the other end is connected with one end of described 9th resistance;
The other end of described 9th resistance is connected with the negative input of described second operational amplifier;
The normal phase input end of described second operational amplifier is connected with described public voltage signal end.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described control module specifically comprises: the 4th not gate, the 5th not gate, the 6th not gate, the 4th with door, the 5th with door and the 6th and door; Wherein,
Described 4th is connected with the second output terminal of described comparison module with the first input end of door, and the second input end is connected with the first output terminal of described comparison module, and output terminal is connected with the grid of described 4th switching transistor;
The described input end of the 4th not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with the described 5th;
Described 5th is connected with the second output terminal of described comparison module with the second input end of door, and output terminal is connected with the grid of described 5th switching transistor;
The described input end of the 5th not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with the described 6th;
The described input end of the 6th not gate is connected with the second output terminal of described comparison module, and output terminal is connected with the second input end of door with the described 6th;
Described 6th is connected with the grid of described 6th switching transistor with the output terminal of door.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described comparison module, specifically comprises: threshold voltage generation unit and comparing unit;
The first input end of described threshold voltage generation unit is connected with described first power supply signal end, second input end is connected with described second source signal end, first output terminal is connected with the first input end of described comparing unit, and the second output terminal is connected with the second input end of described comparing unit; Described threshold voltage generation unit is used for the signal according to described first power supply signal end and described second source signal end, generates first threshold voltage and Second Threshold voltage, and outputs to first input end and second input end of described comparing unit respectively;
3rd input end of described comparing unit is connected with described feedback signal terminal, and the first output terminal is connected with the first input end of described control module, and the second output terminal is connected with the second input end of described control module; Described comparing unit be used for by the signal of described feedback signal terminal respectively with described first threshold voltage and described Second Threshold voltage compare, and comparative result is outputted to respectively first input end and second input end of described control module.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described threshold voltage generation unit, specifically comprises: the tenth resistance, the 11 resistance and the 12 resistance; Wherein,
One end of described tenth resistance is connected with described second source signal end, and the other end is connected with the second input end of described comparing unit with described one end of 11 resistance respectively;
The other end of described 11 resistance is connected with the first input end of described comparing unit with one end of described 12 resistance respectively;
The other end of described 12 resistance is connected with described first power supply signal end.
In a kind of possible embodiment, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, described comparing unit, specifically comprises: the 3rd electric capacity, the first comparer and the second comparer; Wherein,
One end of described 3rd electric capacity is connected with described feedback signal terminal, and the other end is connected with the normal phase input end of described first comparer with described second comparer respectively;
The negative input of described first comparer is connected with the first output terminal of described threshold voltage productive unit, and output terminal is connected with the first input end of described control module;
The negative input of described second comparer is connected with the second output terminal of described threshold voltage productive unit, and output terminal is connected with the second input end of described control module.
Embodiments provide the compensation method of the above-mentioned common electric voltage compensating circuit that a kind of embodiment of the present invention provides, comprising:
Signal according to described first power supply signal end and described second source signal end generates threshold voltage, and the signal of described feedback signal terminal and described threshold voltage is compared, and generates comparative result;
Corresponding control signal is generated according to comparative result;
Under the control of the control signal of correspondence, the signal according to described public voltage signal end and described feedback signal terminal generates corresponding compensating signal and exports.
In a kind of possible embodiment, in the above-mentioned compensation method that the embodiment of the present invention provides, the described signal according to described first power supply signal end and described second source signal end generates threshold voltage, and the signal of described feedback signal terminal and described threshold voltage are compared, generate comparative result, specifically comprise:
According to the signal of described first power supply signal end and described second source signal end, generate first threshold voltage and Second Threshold voltage;
By the signal of described feedback signal terminal respectively with described first threshold voltage and described Second Threshold voltage compare, generate comparative result.
Embodiments provide a kind of display panel, comprise the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides.
The beneficial effect of the embodiment of the present invention comprises:
Embodiments provide a kind of common electric voltage compensating circuit, compensation method and display panel, this common electric voltage compensating circuit comprises: comparison module, control module and output module; Wherein, comparison module is used for generating threshold voltage according to the signal of the first power supply signal end and second source signal end, and the signal of feedback signal terminal and threshold voltage are compared, and comparative result is outputted to respectively first input end and second input end of control module; The comparative result that control module is used for exporting according to comparison module generates corresponding control signal and outputs to the first control end of output module, the second control end and the 3rd control end respectively; Output module is used under the control of the first control end, the second control end and the 3rd control end, and the signal according to public voltage signal end and feedback signal terminal generates corresponding compensating signal and exports.Particularly, the signal of feedback signal terminal reflects the fluctuation situation of common electric voltage, therefore compared with threshold voltage by the signal of comparison module by feedback signal terminal, corresponding comparative result generates corresponding control signal, and then generate corresponding compensating signal according to the control signal of correspondence and export, achieve the compensation of the fluctuation situation for public voltage signal, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
Accompanying drawing explanation
The structural representation of the common electric voltage compensating circuit that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 and Fig. 3 is respectively the concrete structure schematic diagram of the common electric voltage compensating circuit that the embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the common electric voltage compensating circuit provided the embodiment of the present invention, compensation method and display panel is described in detail.
Embodiments provide a kind of common electric voltage compensating circuit, as shown in Figure 1, can comprise: comparison module 01, control module 02 and output module 03; Wherein,
The first input end of comparison module 01 is connected with the first power supply signal end AVDD, second input end is connected with second source signal end GND, 3rd input end is connected with feedback signal terminal FEED, first output terminal is connected with the first input end of control module 02, and the second output terminal is connected with the second input end of control module 02; Comparison module 01 generates threshold voltage for the signal according to the first power supply signal end AVDD and second source signal end GND, and the signal of feedback signal terminal FEED and threshold voltage are compared, and comparative result is outputted to respectively first input end and second input end of control module 02;
First output terminal of control module 02 is connected with the first control end of output module 03, and the second output terminal is connected with the second control end of output module 03, and the 3rd output terminal is connected with the 3rd control end of output module 03; Control module 02 generates corresponding control signal for the comparative result exported according to comparison module 01 and outputs to the first control end of output module 03, the second control end and the 3rd control end respectively;
The first input end of output module 03 is connected with public voltage signal end VCOM, and the second input end is connected with feedback signal terminal FEED, and output terminal is for exporting compensation voltage signal; Output module 03 is under the control of the first control end, the second control end and the 3rd control end, and the signal according to public voltage signal end VCOM and feedback signal terminal FEED generates corresponding compensating signal and exports.
In the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, the signal of feedback signal terminal reflects the fluctuation situation of common electric voltage, therefore compared with threshold voltage by the signal of comparison module by feedback signal terminal, corresponding comparative result generates corresponding control signal, and then generate corresponding compensating signal according to the control signal of correspondence and export, achieve the compensation of the fluctuation situation for public voltage signal, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figure 2, output module 03 specifically comprises: the first switching transistor T1, second switch transistor T2, the 3rd switching transistor T3, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1 and the first operational amplifier Y1; Wherein, the grid of the first switching transistor T1 is connected with the first output terminal of control module 02, and source electrode is connected with one end of the first resistance R1 with public voltage signal end VCOM respectively, drains to be connected with the positive input of the first operational amplifier Y1; The grid of second switch transistor T2 is connected with the second output terminal of control module 02, and source electrode is connected with one end of the second resistance R2 with the other end of the first resistance R1 respectively, drains to be connected with the positive input of the first operational amplifier Y1; The grid of the 3rd switching transistor T3 is connected with the 3rd output terminal of control module 02, and source electrode is connected with one end of the 3rd resistance R3 with the other end of the second resistance R2 respectively, drains to be connected with the positive input of the first operational amplifier Y1; The other end of the 3rd resistance R3 is connected with second source signal end GND; One end of first electric capacity C1 is connected with feedback signal terminal FEED, and the other end is connected with one end of the 4th resistance R4; The other end of the 4th resistance R4 is connected with the negative input of the first operational amplifier Y1 with one end of the 5th resistance R5 respectively; The other end of the 5th resistance R5 is connected with the output terminal of the first operational amplifier Y1.
Particularly, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, first switching transistor can conducting under the control of the first output terminal of control module, the signal Vcom of public voltage signal end is outputted to the normal phase input end of the first operational amplifier by the first switching transistor of conducting, and then the signal that the first operational amplifier output terminal exports is
wherein V
fEEDfor the signal of feedback signal terminal; Second switch transistor can conducting under the control of the second output terminal of control module, the second switch transistor of conducting by one end of the other end of the first resistance and the second resistance respectively with the normal phase input end conducting of the first operational amplifier, and then the signal that the first operational amplifier output terminal exports is
3rd switching transistor can conducting under the control of the 3rd output terminal of control module, 3rd switching transistor of conducting by one end of the other end of the second resistance and the 3rd resistance respectively with the normal phase input end conducting of the first operational amplifier, and then the signal that the first operational amplifier output terminal exports is
like this according to the different control signals that control module exports, control the unlatching of the first switching transistor, second switch transistor and the 3rd switching transistor, thus change the signal of the first operational amplifier positive input, and then change the DC component of the first operational amplifier output, under the prerequisite of response frequency not affecting feedback circuit, the quick compensation to public voltage signal fluctuation can be realized like this.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figure 2, control module 02 specifically comprises: the first not gate F1, the second not gate F2, the 3rd not gate F3, first and door U1, second and door U2 and the 3rd and door U3; Wherein, the input end of the first not gate F1 is connected with the second output terminal of comparison module 01, and output terminal is connected with the first input end of door U1 with first; The input end of the second not gate F2 is connected with the first output terminal of comparison module 01, and output terminal is connected with second input end of door U1 with first; First is connected with the grid of the first switching transistor T1 with the output terminal of door U1; The input end of the 3rd not gate F3 is connected with the first output terminal of comparison module 01, and output terminal is connected with the first input end of door U2 with second; Second is connected with the second output terminal of comparison module 01 with second input end of door U2, and output terminal is connected with the grid of second switch transistor T2; 3rd is connected with the first output terminal of comparison module 01 with the first input end of door U3, and the second input end is connected with the second output terminal of comparison module 01, and output terminal is connected with the grid of the 3rd switching transistor T3.
Particularly, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, the comparative result that comparison module generates outputs to the first not gate of control module respectively by the first output terminal and the second output terminal, second not gate, the input end of the 3rd not gate, and second and door the second input end and the 3rd with the first input end of door and the second input end, the first not gate in control module like this, second not gate, 3rd not gate, first and door, second with door and the 3rd with the logical operation of door, generate corresponding control signal and output to the first switching transistor respectively, the grid of second switch transistor and the 3rd switching transistor, thus control the first switching transistor, second switch transistor and the 3rd opens conducting or the cut-off of switching transistor, and then make output module correspondingly can export different compensating signals, realize the compensation for public voltage signal fluctuation situation, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figure 3, output module 03 can specifically comprise: the 4th switching transistor T4, the 5th switching transistor T5, the 6th switching transistor T6, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the second electric capacity C2 and the second operational amplifier Y2; Wherein, the grid of the 4th switching transistor T4 is connected with the first output terminal of control module 02, and source electrode is connected with the negative input of the second operational amplifier Y2, drains to be connected with one end of the 6th resistance R6; The other end of the 6th resistance R6 is connected with the output terminal of the second operational amplifier Y2; The grid of the 5th switching transistor T5 is connected with the second output terminal of control module 02, and source electrode is connected with the negative input of the second operational amplifier Y2, drains to be connected with one end of the 7th resistance R7; The other end of the 7th resistance R7 is connected with the output terminal of the second operational amplifier Y2; The grid of the 6th switching transistor T6 is connected with the 3rd output terminal of control module 02, and source electrode is connected with the negative input of the second operational amplifier Y2, drains to be connected with one end of the 8th resistance R8; The other end of the 8th resistance R8 is connected with the output terminal of the second operational amplifier Y2; One end of second electric capacity C2 is connected with feedback signal terminal FEED, and the other end is connected with one end of the 9th resistance R9; The other end of the 9th resistance R9 is connected with the negative input of the second operational amplifier Y2; The normal phase input end of the second operational amplifier Y2 is connected with public voltage signal end VCOM.
Particularly, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, 4th switching transistor can conducting under the control of the first output terminal of control module, 4th switching transistor of conducting by the second operational amplifier negative input and one end conducting of the 6th resistance, and then the signal that the second operational amplifier output terminal exports is
wherein V
fEEDfor the signal of feedback signal terminal; 5th switching transistor can conducting under the control of the second output terminal of control module, and the 5th switching transistor of conducting is by one end conducting of the negative input of the second operational amplifier and the 7th resistance, and then the signal that the second operational amplifier output terminal exports is
6th switching transistor can conducting under the control of the 3rd output terminal of control module, 6th switching transistor of conducting by the second operational amplifier negative input and one end conducting of the 8th resistance, and then the signal that the second operational amplifier output terminal exports is
like this according to the different control signals that control module exports, control the unlatching of the 4th switching transistor, the 5th switching transistor and the 6th switching transistor, thus change the enlargement factor of the second operational amplifier, and then change the compensating signal of the second operational amplifier output, can realize like this making quick compensation to the peak voltage of public voltage signal fluctuation.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figure 3, control module 02 can specifically comprise: the 4th not gate F4, the 5th not gate F5, the 6th not gate F6, the 4th with door U4, the 5th with door U5 and the 6th and door U6; Wherein, the 4th is connected with the second output terminal of comparison module 01 with the first input end of door U4, and the second input end is connected with the first output terminal of comparison module 01, and output terminal is connected with the grid of the 4th switching transistor T4; The input end of the 4th not gate F4 is connected with the first output terminal of comparison module 01, and output terminal is connected with the first input end of door U5 with the 5th; 5th is connected with the second output terminal of comparison module 01 with second input end of door U5, and output terminal is connected with the grid of the 5th switching transistor T5; The input end of the 5th not gate F5 is connected with the first output terminal of comparison module 01, and output terminal is connected with the first input end of door U6 with the 6th; The input end of the 6th not gate U6 is connected with the second output terminal of comparison module 01, and output terminal is connected with second input end of door U6 with the 6th; 6th is connected with the grid of the 6th switching transistor T6 with the output terminal of door U6.
Particularly, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, the comparative result that comparison module generates outputs to the 4th not gate of control module respectively by the first output terminal and the second output terminal, 5th not gate, the input end of the 6th not gate, and the 4th with the first input end of door and the second input end, 5th with the second input end of door, the 4th not gate in control module like this, 5th not gate, 6th not gate, 4th and door, 5th with door and the 6th with the logical operation of door, generate corresponding control signal and output to the 4th switching transistor respectively, the grid of the 5th switching transistor and the 6th switching transistor, thus control the 4th switching transistor, 5th switching transistor and the 6th opens conducting or the cut-off of switching transistor, and then make output module correspondingly can export different compensating signals, realize the compensation for public voltage signal fluctuation situation, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figures 2 and 3, comparison module 01 can specifically comprise: threshold voltage generation unit 011 and comparing unit 012; The first input end of threshold voltage generation unit 011 is connected with the first power supply signal end AVDD, second input end is connected with second source signal end GND, first output terminal is connected with the first input end of comparing unit 012, and the second output terminal is connected with the second input end of comparing unit 012; Threshold voltage generation unit 011, for the signal according to the first power supply signal end AVDD and second source signal end GND, generates first threshold voltage and Second Threshold voltage, and outputs to first input end and second input end of comparing unit 012 respectively; 3rd input end of comparing unit 012 is connected with feedback signal terminal FEED, and the first output terminal is connected with the first input end of control module 02, and the second output terminal is connected with the second input end of control module 02; Comparing unit 012 for by the signal of feedback signal terminal FEED respectively with first threshold voltage and Second Threshold voltage compare, and comparative result is outputted to respectively first input end and second input end of control module 02.
Particularly, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, comparison module can specifically comprise threshold voltage generation unit and comparing unit, threshold voltage generation unit is according to the signal of the first power supply signal end and second source signal end, generate first threshold voltage and Second Threshold voltage, and then comparing unit by the signal of feedback signal terminal respectively with first threshold voltage and Second Threshold voltage compare, and comparative result is outputted to respectively first input end and second input end of control module, thus control module generates corresponding control signal according to comparative result, corresponding control signal controls output module and exports corresponding compensating signal, thus the compensation realized for public voltage signal fluctuation situation.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figures 2 and 3, threshold voltage generation unit 011 can specifically comprise: the tenth resistance R10, the 11 resistance R11 and the 12 resistance R12; Wherein, one end of the tenth resistance R10 is connected with second source signal end GND, and the other end is connected with the second input end of comparing unit 012 with one end of the 11 resistance R11 respectively; The other end of 11 resistance R11 is connected with the first input end of comparing unit 012 with one end of the 12 resistance R12 respectively; The other end of the 12 resistance R12 is connected with the first power supply signal end AVDD.Particularly, by arranging the resistance value of the tenth resistance R10, the 11 resistance R11 and the 12 resistance R12, the dividing potential drop of each resistance can be changed, thus changing the size being input to the threshold voltage of comparing unit first input end and the second input end, the threshold voltage that setting is input to the first input end of comparing unit is first threshold voltage V
1, this first threshold voltage is
the threshold voltage that setting is input to the second input end of comparing unit is Second Threshold voltage V
2, this Second Threshold voltage is
threshold voltage generation unit, by the dividing potential drop effect of the tenth resistance, the 11 resistance and the 12 resistance, generates first threshold voltage and Second Threshold voltage and outputs to first input end and second input end of comparing unit respectively.
In the specific implementation, in the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides, as shown in Figures 2 and 3, comparing unit can specifically comprise: the 3rd electric capacity C3, the first comparer B1 and the second comparer B2; Wherein, one end of the 3rd electric capacity C3 is connected with feedback signal terminal FEED, and the other end is connected with the normal phase input end of the second comparer B2 with the first comparer B1 respectively; The negative input of the first comparer B1 is connected with the first output terminal of threshold voltage productive unit 011, and output terminal is connected with the first input end of control module 02; The negative input of the second comparer B2 is connected with the second output terminal of threshold voltage productive unit 011, and output terminal is connected with the second input end of control module 02.Particularly, the first threshold voltage of generation is by threshold voltage generation unit
with Second Threshold voltage be
be input to the negative input of the first comparer and the negative input of the second comparer respectively, and then the first comparer and the second comparer are by the signal V of feedback signal terminal
fEEDrespectively with first threshold voltage V
1with Second Threshold voltage V
2compare, comparative result is outputted to respectively first input end and second input end of control module.
Wherein work as V
fEED≤ V
2time, first comparer and the second comparer export the first logic level signal (such as logic-low signal 0) respectively to the first input end of control module and the second input end, each not gate and the logical operation with door in control module, final first, second, third control end of control signal to output module exporting correspondence; Work as V
2<V
fEED<V
1time, first comparer exports the first input end of the first logic level signal to control module, second comparer exports second input end of the second logic level signal (such as logic-high signal 1) to control module, each not gate and the logical operation with door in control module, final first, second, third control end of control signal to output module exporting correspondence; Work as V
1≤ V
fEEDtime, first comparer and the second comparer export the second logic level signal respectively to the first input end of control module and the second input end, each not gate and the logical operation with door in control module, final first, second, third control end of control signal to output module exporting correspondence.
Respectively the course of work of the concrete common electric voltage compensating circuit shown in Fig. 2 and Fig. 3 is described below:
First threshold voltage and Second Threshold voltage are respectively V
1and V
2: wherein,
To set the first logic level signal be the 0, second logic level signal is 1, by the first comparer and the second comparer by the signal V of feedback signal terminal
fEEDwith V
1, V
2compare, comparative result is the discernible logic level of Sheffer stroke gate, and the logical circuit of Sheffer stroke gate composition carries out logical operation, with the conducting of gauge tap transistor or cut-off to the result that comparer exports;
In circuit shown in Fig. 2, work as V
fEED≤ V
2time, first comparer B1 and the second comparer B2 exports the 0 to the first not gate F1 respectively, second not gate F2, the input end of the 3rd not gate F3, and second and door U2 the second input end and the 3rd with the first input end of door U3 and the second input end, the first switching transistor T1 conducting is made through each not gate with the control signal that the logical operation of door finally exports, second switch transistor T2 and the 3rd switching transistor T3 closes, therefore the signal Vcom of public voltage signal end is outputted to the normal phase input end of the first operational amplifier Y1 by the first switching transistor T1 of conducting, and then first operational amplifier Y1 output terminal export signal be
Work as V
2<V
fEED<V
1time, first comparer B1 exports the 0 to the second not gate F2, the input end of the 3rd not gate F3, and the 3rd with the first input end of door U3, second comparer B2 export the 1 to the first not gate F1 input end and the 3rd with second input end of door U3, second switch transistor T2 conducting is made through each not gate with the control signal that the logical operation of door finally exports, first switching transistor T1 and the 3rd switching transistor T3 closes, therefore conducting second switch transistor T2 by one end of the other end of the first resistance R1 and the second resistance R2 respectively with the normal phase input end conducting of the first operational amplifier Y1, and then first operational amplifier Y1 output terminal export signal be
Work as V
1≤ V
fEEDtime, first comparer B1 and the second comparer B2 exports the 1 to the first not gate F1 respectively, second not gate F2, the input end of the 3rd not gate F3, and second and door U2 the second input end and the 3rd with the first input end of door U3 and the second input end, the 3rd switching transistor T3 conducting is made through each not gate with the control signal that the logical operation of door finally exports, first switching transistor T1 and second switch transistor T2 closes, 3rd switching transistor of conducting by one end of the other end of the second resistance R2 and the 3rd resistance R3 respectively with the normal phase input end conducting of the first operational amplifier Y1, and then first operational amplifier Y1 output terminal export signal be
this circuit does not affect the response frequency of feedback circuit, can realize making the peak voltage of public voltage signal fluctuation compensating fast and effectively.
In circuit shown in Fig. 3, work as V
fEED≤ V
2time, first comparer B1 and the second comparer B2 exports the 0 to the four not gate F4 respectively, 5th not gate F5, the input end of the 6th not gate F6, and the 4th with the first input end of door U4 and the second input end, 5th with second input end of door U5, the 6th switching transistor T6 conducting is made through each not gate with the control signal that the logical operation of door finally exports, 4th switching transistor T4 and the 5th switching transistor T5 closes, therefore conducting the 6th switching transistor T6 by the second operational amplifier Y2 negative input and one end conducting of the 8th resistance R8, and then second operational amplifier Y2 output terminal export signal be
Work as V
2<V
fEED<V
1time, first comparer B1 exports second input end of 0 to the four and door U4, and the 4th input end of not gate F4 and the 5th not gate F5, second comparer B2 exports the first input end of 1 to the four and door U4, 5th with second input end of door U5 and the 6th with the input end of door F6, the 5th switching transistor T5 conducting is made through each not gate with the control signal that the logical operation of door finally exports, 4th switching transistor T4 and the 6th switching transistor T6 closes, therefore the 5th switching transistor T5 of conducting is by one end conducting of the negative input of the second operational amplifier Y2 and the 7th resistance R7, and then second operational amplifier Y2 output terminal export signal be
Work as V
1≤ V
fEEDtime, first comparer B1 and the second comparer B2 exports the 1 to the four not gate F4 respectively, 5th not gate F5, the input end of the 6th not gate F6, and the 4th with the first input end of door U4 and the second input end, 5th with second input end of door U5, the 4th switching transistor T4 conducting is made through each not gate with the control signal that the logical operation of door finally exports, 5th switching transistor T5 and the 6th switching transistor T6 closes, 4th switching transistor T4 of conducting by the second operational amplifier Y2 negative input and one end conducting of the 6th resistance R6, and then second operational amplifier Y2 output terminal export signal be
this circuit, according to the fluctuation situation of public voltage signal, realizes adopting the different mode compensating multiple to realize the compensation of fluctuating to public voltage signal, can realize like this making the peak voltage of public voltage signal fluctuation compensating fast and effectively.
It should be noted that the switching transistor mentioned in the above embodiment of the present invention can be thin film transistor (TFT) (TFT, ThinFilmTransistor), also can be metal oxide semiconductor field effect tube (MOS, MetalOxideSemiconductor), do not limit at this.In concrete enforcement, source electrode and the drain electrode of these transistors can be exchanged, and do not do concrete differentiation.Be described for thin film transistor (TFT) when describing specific embodiment.
Based on same inventive concept, embodiments provide the compensation method of the above-mentioned common electric voltage compensating circuit that a kind of embodiment of the present invention provides, can specifically comprise the following steps:
Signal according to the first power supply signal end and second source signal end generates threshold voltage, and the signal of feedback signal terminal and threshold voltage is compared, and generates comparative result;
Corresponding control signal is generated according to comparative result;
Under the control of the control signal of correspondence, the signal according to public voltage signal end and feedback signal terminal generates corresponding compensating signal and exports.
Particularly, in the above-mentioned compensation method that the embodiment of the present invention provides, by the fluctuation situation of the signal reflection common electric voltage of feedback signal terminal, and then by the signal that compares feedback signal terminal and threshold voltage, corresponding comparative result generates corresponding control signal, and then generate corresponding compensating signal according to the control signal of correspondence and export, achieve the compensation of the fluctuation situation for public voltage signal, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
In the specific implementation, in the above-mentioned compensation method that the embodiment of the present invention provides, signal according to the first power supply signal end and second source signal end generates threshold voltage, and the signal of feedback signal terminal and threshold voltage are compared, generate comparative result, specifically can comprise: according to the signal of the first power supply signal end and second source signal end, generate first threshold voltage and Second Threshold voltage; By the signal of feedback signal terminal respectively with first threshold voltage and Second Threshold voltage compare, generate comparative result.Particularly, by the signal of feedback signal terminal and first threshold voltage and Second Threshold voltage being compared, the corresponding comparative result that generates also exports, thus can realize compensating for public voltage signal fluctuation situation.
Based on same inventive concept, embodiments provide a kind of display panel, comprise the above-mentioned common electric voltage compensating circuit that the embodiment of the present invention provides.The principle of dealing with problems due to this display panel is similar to common electric voltage compensating circuit, and therefore the concrete enforcement of this display panel see the embodiment of above-mentioned common electric voltage compensating circuit, can repeat part and repeat no more.
Embodiments provide a kind of common electric voltage compensating circuit, compensation method and display panel, this common electric voltage compensating circuit comprises: comparison module, control module and output module; Wherein, comparison module is used for generating threshold voltage according to the signal of the first power supply signal end and second source signal end, and the signal of feedback signal terminal and threshold voltage are compared, and comparative result is outputted to respectively first input end and second input end of control module; The comparative result that control module is used for exporting according to comparison module generates corresponding control signal and outputs to the first control end of output module, the second control end and the 3rd control end respectively; Output module is used under the control of the first control end, the second control end and the 3rd control end, and the signal according to public voltage signal end and feedback signal terminal generates corresponding compensating signal and exports.Particularly, the signal of feedback signal terminal reflects the fluctuation situation of common electric voltage, therefore compared with threshold voltage by the signal of comparison module by feedback signal terminal, corresponding comparative result generates corresponding control signal, and then generate corresponding compensating signal according to the control signal of correspondence and export, achieve the compensation of the fluctuation situation for public voltage signal, can the peak voltage of public voltage signal fluctuation be made fast and effectively be compensated like this.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (11)
1. a common electric voltage compensating circuit, is characterized in that, comprising: comparison module, control module and output module; Wherein,
The first input end of described comparison module is connected with the first power supply signal end, second input end is connected with second source signal end, 3rd input end is connected with feedback signal terminal, first output terminal is connected with the first input end of described control module, and the second output terminal is connected with the second input end of described control module; Described comparison module is used for generating threshold voltage according to the signal of described first power supply signal end and described second source signal end, and the signal of described feedback signal terminal and described threshold voltage are compared, and comparative result is outputted to respectively first input end and second input end of described control module;
First output terminal of described control module is connected with the first control end of described output module, and the second output terminal is connected with the second control end of described output module, and the 3rd output terminal is connected with the 3rd control end of described output module; The comparative result that described control module is used for exporting according to described comparison module generates corresponding control signal and outputs to the first control end of described output module, the second control end and the 3rd control end respectively;
The first input end of described output module is connected with public voltage signal end, and the second input end is connected with described feedback signal terminal, and output terminal is for exporting compensation voltage signal; Described output module is used under the control of described first control end, described second control end and described 3rd control end, and the signal according to described public voltage signal end and described feedback signal terminal generates corresponding compensating signal and exports.
2. common electric voltage compensating circuit as claimed in claim 1, it is characterized in that, described output module specifically comprises: the first switching transistor, second switch transistor, the 3rd switching transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the first operational amplifier; Wherein,
The grid of described first switching transistor is connected with the first output terminal of described control module, and source electrode is connected with described public voltage signal end one end with described first resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The grid of described second switch transistor is connected with the second output terminal of described control module, and source electrode is connected with one end of described second resistance with the other end of described first resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The grid of described 3rd switching transistor is connected with the 3rd output terminal of described control module, and source electrode is connected with one end of described 3rd resistance with the other end of described second resistance respectively, drains to be connected with the positive input of described first operational amplifier;
The other end of described 3rd resistance is connected with described second source signal end;
One end of described first electric capacity is connected with described feedback signal terminal, and the other end is connected with one end of described 4th resistance;
The other end of described 4th resistance is connected with the negative input of described first operational amplifier with one end of described 5th resistance respectively;
The other end of described 5th resistance is connected with the output terminal of described first operational amplifier.
3. common electric voltage compensating circuit as claimed in claim 2, it is characterized in that, described control module specifically comprises: the first not gate, the second not gate, the 3rd not gate, first and door, second and door and the 3rd and door; Wherein,
The input end of described first not gate is connected with the second output terminal of described comparison module, and output terminal is connected with the first input end of door with described first;
The input end of described second not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the second input end of door with described first;
Described first is connected with the grid of described first switching transistor with the output terminal of door;
The described input end of the 3rd not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with described second;
Described second is connected with the second output terminal of described comparison module with the second input end of door, and output terminal is connected with the grid of described second switch transistor;
Described 3rd is connected with the first output terminal of described comparison module with the first input end of door, and the second input end is connected with the second output terminal of described comparison module, and output terminal is connected with the grid of described 3rd switching transistor.
4. common electric voltage compensating circuit as claimed in claim 1, it is characterized in that, described output module specifically comprises: the 4th switching transistor, the 5th switching transistor, the 6th switching transistor, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the second electric capacity and the second operational amplifier; Wherein,
The described grid of the 4th switching transistor is connected with the first output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 6th resistance;
The other end of described 6th resistance is connected with the output terminal of described second operational amplifier;
The described grid of the 5th switching transistor is connected with the second output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 7th resistance;
The other end of described 7th resistance is connected with the output terminal of described second operational amplifier;
The grid of described 6th switching transistor is connected with the 3rd output terminal of described control module, and source electrode is connected with the negative input of described second operational amplifier, drains to be connected with one end of described 8th resistance;
The other end of described 8th resistance is connected with the output terminal of described second operational amplifier;
One end of described second electric capacity is connected with described feedback signal terminal, and the other end is connected with one end of described 9th resistance;
The other end of described 9th resistance is connected with the negative input of described second operational amplifier;
The normal phase input end of described second operational amplifier is connected with described public voltage signal end.
5. common electric voltage compensating circuit as claimed in claim 4, it is characterized in that, described control module specifically comprises: the 4th not gate, the 5th not gate, the 6th not gate, the 4th with door, the 5th with door and the 6th and door; Wherein,
Described 4th is connected with the second output terminal of described comparison module with the first input end of door, and the second input end is connected with the first output terminal of described comparison module, and output terminal is connected with the grid of described 4th switching transistor;
The described input end of the 4th not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with the described 5th;
Described 5th is connected with the second output terminal of described comparison module with the second input end of door, and output terminal is connected with the grid of described 5th switching transistor;
The described input end of the 5th not gate is connected with the first output terminal of described comparison module, and output terminal is connected with the first input end of door with the described 6th;
The described input end of the 6th not gate is connected with the second output terminal of described comparison module, and output terminal is connected with the second input end of door with the described 6th;
Described 6th is connected with the grid of described 6th switching transistor with the output terminal of door.
6. the common electric voltage compensating circuit as described in any one of claim 1-5, is characterized in that, described comparison module, specifically comprises: threshold voltage generation unit and comparing unit;
The first input end of described threshold voltage generation unit is connected with described first power supply signal end, second input end is connected with described second source signal end, first output terminal is connected with the first input end of described comparing unit, and the second output terminal is connected with the second input end of described comparing unit; Described threshold voltage generation unit is used for the signal according to described first power supply signal end and described second source signal end, generates first threshold voltage and Second Threshold voltage, and outputs to first input end and second input end of described comparing unit respectively;
3rd input end of described comparing unit is connected with described feedback signal terminal, and the first output terminal is connected with the first input end of described control module, and the second output terminal is connected with the second input end of described control module; Described comparing unit be used for by the signal of described feedback signal terminal respectively with described first threshold voltage and described Second Threshold voltage compare, and comparative result is outputted to respectively first input end and second input end of described control module.
7. common electric voltage compensating circuit as claimed in claim 6, it is characterized in that, described threshold voltage generation unit, specifically comprises: the tenth resistance, the 11 resistance and the 12 resistance; Wherein,
One end of described tenth resistance is connected with described second source signal end, and the other end is connected with the second input end of described comparing unit with described one end of 11 resistance respectively;
The other end of described 11 resistance is connected with the first input end of described comparing unit with one end of described 12 resistance respectively;
The other end of described 12 resistance is connected with described first power supply signal end.
8. common electric voltage compensating circuit as claimed in claim 6, it is characterized in that, described comparing unit, specifically comprises: the 3rd electric capacity, the first comparer and the second comparer; Wherein,
One end of described 3rd electric capacity is connected with described feedback signal terminal, and the other end is connected with the normal phase input end of described first comparer with described second comparer respectively;
The negative input of described first comparer is connected with the first output terminal of described threshold voltage productive unit, and output terminal is connected with the first input end of described control module;
The negative input of described second comparer is connected with the second output terminal of described threshold voltage productive unit, and output terminal is connected with the second input end of described control module.
9. a compensation method for the common electric voltage compensating circuit as described in any one of claim 1-8, is characterized in that, comprising:
Signal according to described first power supply signal end and described second source signal end generates threshold voltage, and the signal of described feedback signal terminal and described threshold voltage is compared, and generates comparative result;
Corresponding control signal is generated according to comparative result;
Under the control of the control signal of correspondence, the signal according to described public voltage signal end and described feedback signal terminal generates corresponding compensating signal and exports.
10. compensation method as claimed in claim 9, it is characterized in that, the described signal according to described first power supply signal end and described second source signal end generates threshold voltage, and the signal of described feedback signal terminal and described threshold voltage is compared, generate comparative result, specifically comprise:
According to the signal of described first power supply signal end and described second source signal end, generate first threshold voltage and Second Threshold voltage;
By the signal of described feedback signal terminal respectively with described first threshold voltage and described Second Threshold voltage compare, generate comparative result.
11. 1 kinds of display panels, is characterized in that, comprise the common electric voltage compensating circuit as described in any one of claim 1-8.
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