CN105654888A - Common electrode voltage compensating circuit and display device - Google Patents
Common electrode voltage compensating circuit and display device Download PDFInfo
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- CN105654888A CN105654888A CN201610080710.9A CN201610080710A CN105654888A CN 105654888 A CN105654888 A CN 105654888A CN 201610080710 A CN201610080710 A CN 201610080710A CN 105654888 A CN105654888 A CN 105654888A
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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
Abstract
The invention discloses a common electrode voltage compensating circuit and a display device, relating to the technical field of display and aiming at reducing the power consumption of display devices. In the common electrode voltage compensating circuit, a control module is used for generating a control signal according to a feedback signal from a feedback signal end, a signal from a first reference voltage end and a signal from a second reference voltage end; a compensation multiple selection module is used for adjusting the compensation multiple of the common electrode voltage compensating circuit according to the control signal and a signal from a turn-on voltage end, and is used for transmitting the feedback signal from the control module to an output module; and the output module is used for generating and outputting a compensating signal according to the feedback signal and a signal from an input signal end. The common electrode voltage compensating circuit can be applied to the display device.
Description
Technical field
The present invention relates to Display Technique field, particularly relate to compensation circuit and the display device of a kind of public electrode voltages.
Background technology
At present, development along with Display Technique, require that the size of display device is increasing, also require that the resolution of display device is more and more higher, this load allowing for display device is increasing, cause data wire, the coupling electric capacity of public electrode etc. also can increase, along with the low and high level of the data signal on data wire converts, public electrode can produce coupling phenomenon, and the degree of coupling of public electrode also can change, the degree of coupling of public electrode is serious or during degree of coupling transition from light to heavy, display device generation crosstalk can be made, turn the phenomenon such as green, affect the display effect of display device.
In order to improve the display effect of display device, need the feedback voltage utilizing public electrode that public electrode voltages is compensated, Fig. 1 is the schematic diagram compensating circuit of public electrode voltages in prior art, as shown in Figure 1, the inverting input of amplifier A "+" connect input signal end Vcomin, its normal phase input end "-" connects feedback signal terminal feedVcom, this feedback signal terminal feedVcom is connected with the public electrode being compensated, the signal that compensates of output is passed into the public electrode being compensated by the outfan Vcomout of amplifier A, thus public electrode voltages is compensated. needing during owing to public electrode voltages being compensated to amplify fixing multiple by compensating signal, the compensation multiple namely public electrode voltages compensated is certain. but, while compensating signal amplification, also can interference amplify, interference can increase the power consumption of display device, when heavier and public electrode the degree of coupling of degree of coupling at public electrode is lighter, all public electrode voltages is fixed the compensation compensating multiple, adds the power consumption of display device.
Summary of the invention
It is an object of the invention to provide the compensation circuit of a kind of public electrode voltages and display device, for reducing the power consumption of display device.
To achieve these goals, the present invention provides following technical scheme:
On the one hand, the invention provides the compensation circuit of a kind of public electrode voltages, including controlling module, compensating multiple selection module and output module;Wherein,
Described control module selects module to be connected with feedback signal terminal, the first reference voltage terminal, the second reference voltage terminal and described compensation multiple respectively, signal for the feedback signal according to described feedback signal terminal, the signal of described first reference voltage terminal and described second reference voltage terminal, generating control signal, described control signal selects module to adjust the compensation multiple compensating circuit of described public electrode voltages for controlling described compensation multiple;
Described compensation multiple selects module to be connected with cut-in voltage end, described control module and described output module respectively, for the signal according to described control signal and described cut-in voltage end, adjust the compensation multiple compensating circuit of described public electrode voltages, and by from controlling the feedback signal transmission that obtains of module to described output module;
Described output module selects module, described input signal end to be connected with described compensation multiple respectively, for the signal according to described feedback signal and described input signal end, generates and compensates signal and export.
On the other hand, the invention provides a kind of display device, including the compensation circuit of the public electrode voltages described in technique scheme.
In the compensation circuit of public electrode voltages provided by the invention and display device, the compensation circuit of public electrode voltages includes controlling module, compensate multiple adjusting module and output module, compared with the compensation circuit of the public electrode voltages that in prior art, public electrode voltages is fixed the compensation compensating multiple, the control module compensated in circuit of the public electrode voltages in the present invention feedback signal according to feedback signal terminal, the signal of the first reference voltage terminal and the signal of the second reference voltage terminal, generate control signal, compensating multiple selects module according to control signal, adjust the compensation multiple compensating circuit of public electrode voltages, owing to feedback signal can reflect the degree of coupling of public electrode, thus when public electrode degree of coupling is heavier, bigger compensation multiple is provided, when public electrode degree of coupling is lighter, less compensation multiple is provided, thus reducing the power consumption of display device.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 is the schematic diagram compensating circuit of public electrode voltages in prior art;
Fig. 2 is the schematic diagram compensating circuit of the public electrode voltages in the embodiment of the present invention one;
Fig. 3 is the schematic diagram compensating circuit of the public electrode voltages in the embodiment of the present invention two;
Fig. 4 is the schematic diagram of the feedback signal in the embodiment of the present invention two and the first comparator, the magnitude relationship of the upper and lower thresholding of the second comparator.
Detailed description of the invention
In order to further illustrate compensation circuit and the display device of the public electrode voltages that the embodiment of the present invention provides, it is described in detail below in conjunction with Figure of description.
Embodiment one
Referring to Fig. 2, the compensation circuit of the public electrode voltages that the embodiment of the present invention provides includes controlling module P1, compensates multiple selection module P2 and output module P3, wherein, control module P1 respectively with feedback signal terminal feedVcom, first reference voltage terminal U1, second reference voltage terminal U2 and compensation multiple select module P2 to connect, for the feedback signal according to feedback signal terminal feedVcom, the signal of the first reference voltage terminal U1 and the signal of the second reference voltage terminal U2, generate control signal, control signal selects module P2 to adjust the compensation multiple compensating circuit of public electrode voltages for control and compensation multiple, it should be noted that, feedback signal terminal feedVcom is connected with the public electrode being compensated, that is, the feedback signal of feedback signal terminal feedVcom is to be provided by the public electrode being compensated,Compensating multiple selects module P2 to be connected with cut-in voltage end AVDD, control module P1 and output module P3 respectively, for the signal according to control signal and cut-in voltage end AVDD, adjust the compensation multiple compensating circuit of public electrode voltages, and by from the control module P1 feedback signal transmission obtained to output module P3; Output module P3 selects module P2, input signal end Vcomin to be connected respectively with compensation multiple, for according to feedback signal and the signal inputting signal end Vcomin, generating and compensate signal, and export from the outfan Vcomout of output module P3.
Below in conjunction with the structure compensating circuit of public electrode voltages in embodiment one, the driving method compensating circuit of above-mentioned public electrode voltages is illustrated:
First stage, control module P1 and accept the feedback signal of feedback signal terminal feedVcom, this feedback signal is the signal that the public electrode being compensated provides, control the module P1 signal according to feedback signal, the signal of the first reference voltage terminal U1 and the second reference voltage terminal U2, generate control signal, to compensating multiple, control signal transmission is selected module P2, and control signal selects module P2 to adjust the compensation multiple compensating circuit of described public electrode voltages for control and compensation multiple.
Second stage, compensating multiple selects module P2 to accept control signal, signal according to control signal and cut-in voltage end AVDD, adjust the compensation multiple compensating circuit of public electrode voltages, thus when the degree of coupling that feedback signal represents public electrode is heavier, adjust and compensate multiple relatively greatly, when the degree of coupling that feedback signal represents public electrode is lighter, adjust compensation multiple less.
Phase III, output module P3 accepts feedback signal and the signal of input signal end Vcomin, the signal according to feedback signal and input signal end Vcomin, generates and compensates signal and export, compensate signal to export to the public electrode being compensated, thus public electrode voltages is compensated.
The compensation circuit of public electrode voltages provided by the invention includes controlling module P1, compensate multiple adjusting module and output module P3, compared with the compensation circuit of the public electrode voltages that in prior art, public electrode voltages is fixed the compensation compensating multiple, the control module P1 compensated in circuit of the public electrode voltages in the present invention feedback signal according to feedback signal terminal feedVcom, the signal of the first reference voltage terminal U1 and the signal of the second reference voltage terminal U2, generate control signal, compensating multiple selects module P2 according to control signal, adjust the compensation multiple compensating circuit of public electrode voltages, owing to feedback signal can reflect the degree of coupling of public electrode, thus when public electrode degree of coupling is heavier, bigger compensation multiple is provided, when public electrode degree of coupling is lighter, less compensation multiple is provided, thus reducing the power consumption of display device.
Embodiment two
Refer to Fig. 3, the control module P1 compensated in circuit of the public electrode voltages being explained below in above-described embodiment, the concrete structure compensating multiple selection module P2 and output module P3 and annexation:
Control module P1 and include the first comparator OP1, the second comparator OP2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the six resistance R6; Wherein, the inverting input "-" of the first comparator OP1 connects second end of the first electric capacity C1 in first end of the first resistance R1, first end of the 5th resistance R5, compensation multiple selection module P2 respectively, its normal phase input end "+" connecting first end of first end of the second resistance R2, first end of the 3rd resistance R3 and the 4th resistance R4 respectively, its outfan connects second end of the 3rd resistance R3 respectively and compensates multiple and select the control pole of the first switching tube M1 in module P2;The inverting input "-" of the second comparator OP2 connects second end of the 5th resistance R5, its normal phase input end "+" connecting first end of the 6th resistance R6, its outfan connects second end of the 4th resistance R4 respectively and compensates multiple and select the control pole of the second switch pipe M2 in module P2; First end of the first resistance R1 connects feedback signal terminal feedVcom; Second end of the second resistance R2 connects the first reference voltage terminal U1; Second end of the 6th resistance R6 connects the second reference voltage terminal U2.
Compensation multiple selection module P2 includes the first switching tube M1, second switch pipe M2, the 3rd switching tube M3, the first electric capacity C1, the first resistor group X1 and the second resistor group X2, the first resistor group X1 and the second resistor group X2 and all includes at least one resistance; Wherein, first pole of the first switching tube M1 connects cut-in voltage end AVDD, and its second pole connects the control pole of the 3rd switching tube M3; First pole of second switch pipe M2 connects the control pole of the 3rd switching tube M3, and its second pole connects cut-in voltage end AVDD; First pole of the 3rd switching tube M3 connects first end of the first electric capacity C1 and first end of the first resistor group X1 respectively, and its second pole connects first end of the second resistor group X2; Second end of the first resistor group X1 connects the inverting input "-" of the amplifier A in second end of the second resistor group X2 and output module P3 respectively; Second end of the second resistor group X2 connects the inverting input "-" of the amplifier A in output module P3; First end of the inverting input "-" of the first comparator OP1 in the second end link control module P1 of the first electric capacity C1, first end of the first resistance R1 and the 5th resistance R5.
Output module P3 includes amplifier A and the seven resistance R7; Wherein, the inverting input "-" of amplifier A connects respectively and compensates multiple and select first end of second end of the first resistor group X1 in module P2, second end of the second resistor group X2 and the 7th resistance R7, its normal phase input end "+" connecting input signal end Vcomin, its outfan connects second end of the 7th resistance R7.
It should be noted that each switching tube above-mentioned is specifically as follows transistor, if switching tube is transistor, then control extremely grid, the first pole and second extremely in one be source electrode, another for drain electrode. First comparator OP1 and the second comparator OP2 is specifically as follows hysteresis comparator, thus improving the response speed of comparator, it is to avoid the self-oscillation compensating circuit of public electrode voltages. Amplifier A is specifically as follows linear amplifier. Cut-in voltage end AVDD continues to export fixed signal, and this fixed signal enables to the 3rd switching tube M3 and opens.
Below in conjunction with the structure compensating circuit of public electrode voltages in embodiment two, a resistance (also by X1 and X2 mark) is all included with the first resistor group X1 and the second resistor group X2, cut-in voltage end AVDD continues to export high level signal, control signal required for first switching tube M1, second switch pipe M2, unlatching is low level signal, control signal required for 3rd switching tube M3 unlatching is high level signal is example, and the driving method compensating circuit of above-mentioned public electrode voltages is illustrated:
Need exist for illustrate be, the signal of the first reference voltage terminal U1 pass into the first comparator OP1 normal phase input end "+", fan-out capability according to the voltage of signal of the first reference voltage terminal U1, the resistance of the second resistance R2, the resistance of the 3rd resistance R3 and the first comparator OP1, the Upper threshold UIH+ and Lower Threshold UIL+ that obtain the first comparator OP1 can be calculated, wherein, Upper threshold UIH+ is higher than Lower Threshold UIL+;In like manner, through calculating, it is also possible to obtain the Upper threshold UIH-and Lower Threshold UIL-of the second comparator OP2, wherein, Upper threshold UIH-is higher than Lower Threshold UIL-; In the present embodiment, the Lower Threshold UIL+ of the first comparator OP1 is higher than the Upper threshold UIH-of the second comparator OP2.
Compensated stage, as shown in Figure 4, when the voltage of feedback signal of feedback signal terminal feedVcom is less than the Lower Threshold UIL+ of the first comparator OP1, and during more than the Upper threshold UIH-of the second comparator OP2, and the degree of coupling of public electrode lighter time, first comparator OP1 and the second comparator OP2 all exports high level, first switching tube M1 and second switch pipe M2 is turned off, 3rd switching tube M3 is also switched off, now, the compensation multiple compensating circuit of public electrode voltages is the R7/X1 ratio of the resistance of the first resistor group X1 (resistance of the 7th resistance R7 with), compensate multiple less comparatively speaking. when feedback signal raises under the scene of (i.e. upwards coupling), when the voltage of the feedback signal that the inverting input "-" of the first comparator OP1 receives is more than the Upper threshold UIH+ of the first comparator OP1, namely when the degree of coupling of public electrode is heavier, the output state of the first comparator OP1 changes, the output state of the second comparator OP2 remains unchanged, the outfan output low level signal of the first comparator OP1, the outfan output high level signal of the second comparator OP2, first switching tube M1 and the three switching tube M3 all opens, second switch pipe M2 closes, now, the compensation multiple compensating circuit of public electrode voltages is (R7*X1*X2)/(X1+X2) (resistance of the 7th resistance R7 and the first resistor group X1 in parallel, the ratio of the resistance of the second resistor group X2), compensate multiple bigger comparatively speaking. under the scene of feedback signal decline (i.e. coupling downwards), when the voltage of the feedback signal that the inverting input "-" of the second comparator OP2 receives is less than the Lower Threshold UIL-of the second comparator OP2, namely when the degree of coupling of public electrode is heavier, the output state of the first comparator OP1 changes, the output state of the second comparator OP2 keeps changing, the outfan output high level signal of the first comparator OP1, the outfan output low level signal of the second comparator OP2, second switch pipe M2 and the three switching tube M3 all opens, first switching tube M1 closes, now, the compensation multiple compensating circuit of public electrode voltages is (R7*X1*X2)/(X1+X2) (resistance of the 7th resistance R7 and the first resistor group X1 in parallel, the ratio of the resistance of the second resistor group X2), compensate multiple bigger comparatively speaking.
Embodiment three
The embodiment of the present invention provides a kind of display device, and display device includes the compensation circuit of the public electrode voltages in above-described embodiment. Concrete, display device can be any product with display function or the parts such as Electronic Paper, mobile phone, panel computer, television set, display, notebook computer, DPF, navigator. The compensation circuit of the public electrode voltages compensated in circuit and above-described embodiment of the public electrode voltages in described display device has the advantage that identical, repeats no more herein.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is the difference with other embodiments.
In the description of above-mentioned embodiment, specific features, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (9)
1. the compensation circuit of a public electrode voltages, it is characterised in that include controlling module, compensating multiple selection module and output module; Wherein,
Described control module selects module to be connected with feedback signal terminal, the first reference voltage terminal, the second reference voltage terminal and described compensation multiple respectively, signal for the feedback signal according to described feedback signal terminal, the signal of described first reference voltage terminal and described second reference voltage terminal, generating control signal, described control signal selects module to adjust the compensation multiple compensating circuit of described public electrode voltages for controlling described compensation multiple;
Described compensation multiple selects module to be connected with cut-in voltage end, described control module and described output module respectively, for the signal according to described control signal and described cut-in voltage end, adjust the compensation multiple compensating circuit of described public electrode voltages, and by from controlling the feedback signal transmission that obtains of module to described output module;
Described output module selects module, described input signal end to be connected with described compensation multiple respectively, for the signal according to described feedback signal and described input signal end, generates and compensates signal and export.
2. the compensation circuit of public electrode voltages according to claim 1, it is characterised in that described control module includes the first comparator, the second comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance; Wherein,
The inverting input of described first comparator connects the first end of described first resistance, the first end of described 5th resistance, described compensation multiple selection module respectively, its normal phase input end connects the first end of the first end of described second resistance, the first end of described 3rd resistance and described 4th resistance respectively, and its outfan connects the second end of described 3rd resistance respectively and described compensation multiple selects module;
The inverting input of described second comparator connects the second end of described 5th resistance, and its normal phase input end connects the first end of described 6th resistance, and its outfan connects the second end and the described compensation multiple selection module of described 4th resistance respectively;
First end of described first resistance connects described feedback signal terminal; Second end of described second resistance connects described first reference voltage terminal; Second end of described 6th resistance connects described second reference voltage terminal.
3. the compensation circuit of public electrode voltages according to claim 1, it is characterized in that, described compensation multiple selection module includes the first switching tube, second switch pipe, the 3rd switching tube, the first electric capacity, the first resistor group and the second resistor group, described first resistor group and described second resistor group and all includes at least one resistance; Wherein,
The control pole of described first switching tube connects described control module, and its first pole connects described cut-in voltage end, and its second pole connects the control pole of described 3rd switching tube;
The control pole of described second switch pipe connects described control module, and its first pole connects the control pole of described 3rd switching tube, and its second pole connects described cut-in voltage end;
First pole of described 3rd switching tube connects the first end of described first electric capacity and the first end of described first resistor group respectively, and its second pole connects the first end of described second resistor group;
Second end of described first resistor group connects the second end of described second resistor group and described output module respectively;
Second end of described second resistor group connects described output module;
Second end link control module of described first electric capacity.
4. the compensation circuit of public electrode voltages according to claim 1, it is characterised in that described output module includes amplifier and the 7th resistance; Wherein,
The inverting input of described amplifier connects described compensation multiple respectively and selects the first end of module and described 7th resistance, and its normal phase input end connects described input signal end, and its outfan connects the second end of described 7th resistance.
5. the compensation circuit of the public electrode voltages according to any one in claim 2-4, it is characterized in that, second end of the first electric capacity connects the inverting input of the first comparator respectively, first end of the first resistance and the first end of the 5th resistance, the pole that controls of the first switching tube connects the outfan of the first comparator and the second end of the 3rd resistance respectively, the pole that controls of second switch pipe connects the outfan of the second comparator and the second end of the 4th resistance respectively, second end of the first resistor group connects the first end of the 7th resistance and the inverting input of amplifier respectively, second end of the second resistor group connects the first end of the 7th resistance and the inverting input of amplifier respectively.
6. the compensation circuit of public electrode voltages according to claim 2, it is characterised in that described first comparator and described second comparator are hysteresis comparator.
7. the compensation circuit of public electrode voltages according to claim 4, it is characterised in that described amplifier is linear amplifier.
8. the compensation circuit of public electrode voltages according to claim 2, it is characterised in that the Lower Threshold of described first comparator is higher than the Upper threshold of described second comparator.
9. a display device, it is characterised in that include in claim 1-8 the compensation circuit of public electrode voltages described in any one.
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