CN103913867A - Liquid crystal display device and noise elimination method - Google Patents
Liquid crystal display device and noise elimination method Download PDFInfo
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Abstract
Embodiments of the invention disclose a liquid crystal display device and a noise elimination method which belong to the field of display techniques. The liquid crystal display device comprises a printed circuit board, a liquid crystal display panel, and a flexible printed circuit board, and a timing controller, a digital-analog conversion circuit, and a common voltage supply device are disposed on the printed circuit board. The timing controller is used for generating a timing signal according to a detected noise signal generated by a common electrode, and providing the generated timing signal for the digital-analog conversion circuit. The digital-analog conversion circuit is used for converting the timing signal provided by the timing controller into a first analog signal, and providing the first analog signal for the common voltage supply device. The common voltage supply device is used for superposing the first analog signal and common voltage with the noise signal so as to generate first common voltage with the noise signal eliminated. The liquid crystal display device and the noise elimination method have the advantages that the noise generated by the display panel can be substantially eliminated and no touch disturbance is caused to a touch panel on the display panel.
Description
Technical field
The present invention relates to display technique field, particularly a kind of liquid crystal indicator and noise removing method.
Background technology
In recent years, the rapid technological improvement relevant with liquid crystal indicator, such as touch-control demonstrations etc., have been widely used on communication product, computer installation and consumption electronic products, the convenience of nationality significantly to increase the usefulness of applied electronic product and to use.The liquid crystal indicator with touch display function generally includes display panels and is arranged at the touch-screen on display panels.
The cross-sectional view of existing a kind of display panels as shown in Figure 1, this display panels comprise colored filter (Color Filter, CF) substrate 101, and the thin-film transistor array base-plate 103 that is oppositely arranged of colored filter substrate 101 and be clipped in thin-film transistor array base-plate 103 and colored filter substrate 101 between liquid crystal layer 102.Wherein, colored filter substrate 101 comprises the first substrate of glass 110, in the first substrate of glass 110 and towards a side of liquid crystal layer 102, be provided with public electrode 105, thin-film transistor array base-plate 103 comprises the second substrate of glass 112, in the second substrate of glass 112 and towards a side of liquid crystal layer 102, be provided with pixel electrode 107, public electrode 105 can apply electric field to liquid crystal layer 102 with pixel electrode 107, and then can control display panels display frame.
Thin-film transistor array base-plate 103 is also provided with MOSFET(Metal Oxide Semiconductor Field-Effect-Transistor, MOS (metal-oxide-semiconductor) memory), it is a kind of a-Si (amorphous silicon film transistor), it comprises the source electrode (source) 111, grid (gate) 113 and the drain electrode 115 that are arranged in the second substrate of glass 112, and source electrode 111 can form coupling capacitance with the public electrode 105 of setting on colored filter substrate 101 with grid 113.In the time that source electrode 111 changes with the waveform of grid 113 output signals, the waveform changing can be coupled on public electrode 105, it is not stable causing the voltage on public electrode 105, but with noise, and voltage on public electrode 105 is to be provided by the common electric voltage generator being connected with public electrode 105, so noise also can be delivered to common electric voltage generator by public electrode 105.In the time that the noise producing on public electrode 105 reaches certain value, will have influence on the touch-control sensitivity of the touch-screen (Touch panel) (touch-screen can be arranged on colored filter substrate 101) arranging on display panels, if for example noise is too large, can cause the position of the touch point on user's point touching screen to be difficult for detecting, cause the touch-control of touch-screen is disturbed.
Summary of the invention
The invention provides a kind of liquid crystal indicator and noise removing method, to solve the problems such as touch-control interference touch-screen being brought due to the noise producing on public electrode.
The invention provides a kind of liquid crystal indicator, this liquid crystal indicator comprises: on printed circuit board (PCB), display panels, the flexible printed wiring board being connected with display panels with printed circuit board (PCB), printed circuit board (PCB), time schedule controller, D/A converting circuit and common electric voltage generator are set, wherein, time schedule controller, for producing clock signal according to the noise signal producing on the public electrode detecting, and the clock signal of generation is offered to D/A converting circuit; D/A converting circuit, is converted to the first simulating signal for the clock signal that time schedule controller is provided, and the first simulating signal is offered to common electric voltage generator; Common electric voltage generator, for by the first simulating signal and superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and offers public electrode by the common electric voltage of the first elimination noise signal.
In preferred embodiment of the present invention, the waveform of the first simulating signal is the inversion waveforms of the waveform of the noise signal that produces on public electrode.
In preferred embodiment of the present invention, testing circuit is also set on printed circuit board (PCB); Wherein, common electric voltage generator, for offering testing circuit by the common electric voltage of the first elimination noise signal; Whether testing circuit, fluctuate for detection of the waveform of the common electric voltage of the first elimination noise signal, in the time there is fluctuation, exports control signal to D/A converting circuit; D/A converting circuit, for generating the second simulating signal according to the control signal of testing circuit output; Common electric voltage generator, the common electric voltage of eliminating noise signal for the second simulating signal and first that D/A converting circuit is generated is superimposed, to generate the common electric voltage of the second elimination noise signal.
In preferred embodiment of the present invention, storer is also set on printed circuit board (PCB), storer is for the waveform fluctuation information of common electric voltage and the question blank of control signal corresponding relation of pre-stored elimination noise signal, testing circuit compares the waveform fluctuation information of the common electric voltage of the elimination noise signal detecting and the corresponding relation being stored in question blank, and controlled signal.
In preferred embodiment of the present invention, liquid crystal indicator also comprises backlight and is arranged at the conductive film in backlight, D/A converting circuit, also for the first simulating signal is offered to conductive film, the first simulating signal on public electrode induction conductive film, make the noise signal that produces on the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage.
The present invention also provides a kind of noise removing method, and this noise removing method, comprising: utilize time schedule controller to produce clock signal according to the noise signal producing on the public electrode detecting, and the clock signal of generation is offered to D/A converting circuit; Utilize the clock signal that D/A converting circuit provides time schedule controller to be converted to the first simulating signal, and the first simulating signal is offered to common electric voltage generator; Utilize common electric voltage generator by the first simulating signal and superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to public electrode.
In preferred embodiment of the present invention, the waveform of the first simulating signal is the inversion waveforms of the waveform of the noise signal that produces on public electrode.
In preferred embodiment of the present invention, also comprise step: utilize common electric voltage generator that the common electric voltage of the first elimination noise signal is offered to testing circuit; Utilize testing circuit to detect the first waveform of eliminating the common electric voltage of noise signal and whether fluctuate, in the time there is fluctuation, export control signal to D/A converting circuit; Utilize D/A converting circuit to generate the second simulating signal according to the control signal of testing circuit output; The common electric voltage that utilizes common electric voltage generator that the second simulating signal of D/A converting circuit generation and first is eliminated to noise signal is superimposed, to generate the common electric voltage of the second elimination noise signal.
In preferred embodiment of the present invention, whether utilize testing circuit to detect the first waveform of eliminating the common electric voltage of noise signal fluctuates, in the time there is fluctuation, export control signal in D/A converting circuit, comprise step: utilize testing circuit that the waveform fluctuation information of the common electric voltage of the elimination noise signal detecting and pre-stored corresponding relation in question blank are compared, and controlled signal.
In preferred embodiment of the present invention, also comprise step: utilize D/A converting circuit that the first simulating signal is offered to conductive film, the first simulating signal on public electrode induction conductive film, make the noise signal that produces on the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage, conductive film is arranged in backlight.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By common electric voltage generator by the first simulating signal with superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to the public electrode being arranged on colored filter substrate.The problems such as touch-control interference touch-screen being brought due to the noise producing on public electrode are solved, the embodiment of the present invention can be done Processing for removing fundamentally to the noise producing on display panels, can not bring touch-control to disturb to the touch-screen arranging on display panels.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Brief description of the drawings
Fig. 1 is the cross-sectional view of existing a kind of display panels;
Fig. 2 A is the cut-away section structural representation of the liquid crystal indicator that provides of first embodiment of the invention;
Fig. 2 B is the main block architecture diagram of the liquid crystal indicator that provides of first embodiment of the invention;
In Fig. 3, (a) is a kind of voltage-time waveform figure of noise signal;
In Fig. 3, (b) is the voltage-time waveform figure of the clock signal that obtains according to the waveform of the noise signal of (a) in Fig. 3;
In Fig. 3, (c) is a kind of voltage-time waveform figure of the first simulating signal;
In Fig. 3, (d) is the voltage-time waveform figure of the common electric voltage of the first elimination noise signal;
Fig. 4 is the main block architecture diagram of the liquid crystal indicator that provides of second embodiment of the invention;
Fig. 5 is the main block architecture diagram of the liquid crystal indicator that provides of third embodiment of the invention;
Fig. 6 is the process flow diagram of the noise removing method that provides of fourth embodiment of the invention;
Fig. 7 is the process flow diagram of the noise removing method that provides of fifth embodiment of the invention;
Fig. 8 is the process flow diagram of the noise removing method that provides of sixth embodiment of the invention.
Embodiment
Technological means and effect of taking for reaching predetermined goal of the invention for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to liquid crystal indicator and its embodiment of noise removing method, structure, feature and effect of proposing according to the present invention, be described in detail as follows.
Relevant aforementioned and other technology contents of the present invention, Characteristic, can clearly present in following cooperation in describing in detail with reference to graphic preferred embodiment.By the explanation of embodiment, when being able to more deeply and concrete understanding for technological means and effect of reaching predetermined object and taking the present invention, but appended graphic be only to provide with reference to the use of explanation, be not used for the present invention to be limited.
The first embodiment
Please refer to Fig. 2 A and Fig. 2 B, Fig. 2 A shows the cut-away section structural representation of the liquid crystal indicator that first embodiment of the invention provides.Fig. 2 B shows the main block architecture diagram of the liquid crystal indicator that first embodiment of the invention provides.Described liquid crystal indicator, comprise: printed circuit board (PCB) (Printed Circuit Board, PCB) 201, display panels 205, the flexible printed wiring board (Flexible Printed Circuit Board, FPCB) 203 being connected with display panels 205 with printed circuit board (PCB) 201 and be arranged at the contact panel (not shown) on display panels 205.Display panels in Fig. 2 A comprises array base palte 200, and the colored filter substrate 202 that is oppositely arranged of array base palte 200, is clipped in the liquid crystal layer 204 between array base palte 200 and colored filter substrate 202 and is arranged on liquid crystal layer 204 frame glue 221 around, array base palte 200 and colored filter substrate 202 fit tightly by frame glue, region deviding one viewing area 223 that frame glue 221 surrounds.Colored filter substrate 202 comprises substrate of glass 215, (the Over Coat) 217 that be arranged on the protective seam on substrate of glass 215 surfaces, cover the public electrode 219 on protective seam 217 surfaces.
Time schedule controller (TCON) 207, D/A converting circuit 209 and common electric voltage generator 211 are set on printed circuit board (PCB) 201.
Time schedule controller 207, is electrical connected with D/A converting circuit 209, for producing clock signal according to the noise signal producing on the public electrode 219 detecting, and the clock signal of generation is offered to D/A converting circuit 209.
Particularly, the noise signal producing on public electrode 219 can be by detecting or detecting and know in real time in advance, if adopt detection mode in advance for example can repeatedly repeatedly detect the noise signal producing on public electrode 219 in reality by checkout equipments such as oscillographs, then the noise signal detecting offered to time schedule controller 207.Liquid crystal indicator is showing that noise signal when different pictures is different, and reason is source electrode output waveform difference while showing different pictures, causes source electrode output waveform to be coupled to the noise signal difference on the public electrode 219 of colored filter board 200.But, know through repeated multiple times detection, often the peak location of noise signal waveform is identical, just the amplitude difference of noise signal waveform.Therefore can be by detecting in advance on public electrode 219 the noise signal producing, and determine the amplitude range of peak location and the noise signal waveform of noise signal waveform.Wherein, noise signal is simulating signal, and clock signal is digital signal.As shown in (a) in Fig. 3, show the voltage-time waveform figure of a kind of noise signal that checkout equipment detects, the waveform of the noise signal in Fig. 3 in (a) is the waveform periodically repeating, and in Fig. 3, (b) is the voltage-time waveform figure of the clock signal that obtains according to the noise signal waveform of (a) in Fig. 3.The wave period of the clock signal producing in (b) in Fig. 3 is identical with the wave period of the noise signal producing on public electrode 219 in (a) in Fig. 3, when the noise signal producing on public electrode 219 is negative pulse, the rising edge of the waveform of corresponding clock signal, when the noise signal producing on public electrode 219 is positive pulse, the negative edge of the waveform of corresponding clock signal.In embodiments of the present invention, also can be according to the different waveforms that produce the clock signal of other shape of the waveform of detected noise signal, can also produce according to actual needs the waveform of multiple clock signals, but as long as the waveform of clock signal meets following condition: when the noise signal producing on public electrode 219 is negative pulse, the rising edge of the waveform of corresponding clock signal, when the noise signal producing on public electrode 219 is positive pulse, the negative edge of the waveform of corresponding clock signal.
D/A converting circuit 209, is electrical connected with common electric voltage generator 211 and time schedule controller 207, is converted to the first simulating signal, and the first simulating signal is offered to common electric voltage generator 211 for the clock signal that time schedule controller 207 is provided.
Wherein, the waveform of the first simulating signal is the inversion waveforms of the waveform of the noise signal of generation on public electrode 219, and the voltage magnitude of both waveforms is identical, and voltage direction is contrary.It as shown in (c) in Fig. 3, is a kind of voltage-time waveform figure of the first simulating signal.It is just in time the inversion waveforms of the waveform of (a) middle noise signal in Fig. 3.In Fig. 3, (c) illustrates a kind of spike waveform of the first simulating signal, uses this waveform but do not limit, and also can use other waveform, such as square wave etc.If adopt square wave can have certain elimination effect to above-mentioned noise signal, the effect of just eliminating does not adopt the eradicating efficacy of spike waveform signal good, as long as but can make noise be down to acceptable scope yet.
In addition, it should be noted that, in Fig. 3, in (a)-Fig. 3 in (c), the coordinate figure on horizontal ordinate is relevant with the waveform position of source electrode and grid, relevant with resolution and the refresh rate of liquid crystal indicator.Coordinate figure on ordinate is relevant with the display frame of liquid crystal indicator, and therefore, in practice, the coordinate figure on horizontal ordinate and ordinate can not be unified for a kind of coordinate value, is only a kind of example at this.
Common electric voltage generator 211, be electrical connected with D/A converting circuit 209, be used for the first simulating signal with superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to the public electrode being arranged on colored filter substrate 202.
Because common electric voltage generator 211 is electrical connected with public electrode 219, it provides common electric voltage to public electrode 219, and in practice on public electrode 219 with noise signal, therefore noise signal can be passed to common electric voltage generator 211, makes common electric voltage that common electric voltage generator 211 produces with noise signal.Therefore common electric voltage generator 211 is by superimposed to the common electric voltage with noise signal and the first simulating signal.And the first simulating signal is the wherein a kind of inversion waveforms of waveform of noise signal producing on public electrode, when by after superimposed this kind of noise signal producing on the first simulating signal and public electrode, the common electric voltage generating that is to say the common electric voltage of having eliminated most of noise signal, makes noise be down to acceptable scope.In practice, the noise signal of liquid crystal indicator in the time showing different pictures is different, reason is to show source electrode output waveform difference when different pictures, causes source electrode output waveform to be coupled to the noise signal difference on the public electrode 219 of colored filter board 200.But often the peak location of noise signal waveform is identical, the just amplitude difference of noise signal waveform.And the first simulating signal is the wherein a kind of inversion waveforms of waveform of noise signal producing on public electrode, when the first waveform of eliminating the common electric voltage of noise signal of generation after superimposed this kind of noise signal producing on the first simulating signal and public electrode is also existed to fluctuation a little.Although noise has been lowered to acceptable scope, not also perfect condition, under perfect condition, the first waveform of eliminating the common electric voltage of noise signal is not have any fluctuation.In Fig. 3, (d) shows the voltage-time waveform figure of the common electric voltage of the first elimination noise signal, and its result in the ideal situation stably.The common electric voltage of having offset like this noise signal can offer the public electrode being arranged on colored filter substrate 202, thereby effectively reduce noise, and then eliminate by noise signal and cause impact on touch screen performance (such as the sensitivity impact on touch-screen etc.).
In embodiments of the present invention, the first common electric voltage of eliminating noise signal of generation directly offers public electrode 219, just one of them example; In other embodiments, also can according to actual needs the common electric voltage of the first elimination noise signal be offered to public electrode 219 by miscellaneous equipment.
As mentioned above, the liquid crystal indicator that the present embodiment provides, by common electric voltage generator 211 by the first simulating signal with superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to the public electrode 219 being arranged on colored filter substrate.Solve due to problems such as the noise touch-control interference that touch-screen is brought producing on public electrode 219, the embodiment of the present invention can be done Processing for removing fundamentally to the noise producing on display panels, can not bring touch-control to disturb to the touch-screen arranging on display panels.
The second embodiment
Please refer to Fig. 4, it shows the main block architecture diagram of the liquid crystal indicator that second embodiment of the invention provides.The present embodiment has carried out eliminating completely to noise signal.Fig. 4 improves on the basis of Fig. 2 B.It is similar to the liquid crystal indicator shown in Fig. 2 B, and its difference is, testing circuit 301 and storer 303 are also set on printed circuit board (PCB) 201.
Common electric voltage generator 211, also for offering testing circuit 301 by the common electric voltage of the first elimination noise signal.
Whether testing circuit 301, is electrical connected with common electric voltage generator 211 and D/A converting circuit 209, fluctuate for detection of the waveform of the common electric voltage of the first elimination noise signal, in the time there is fluctuation, exports control signal to D/A converting circuit 209.Although the first embodiment can be lowered to noise acceptable scope, is not also perfect condition, under perfect condition, the first waveform of eliminating the common electric voltage of noise signal is not have any fluctuation.If there is fluctuation, represent also to exist other noise being caused by environment, the noise that the uncertain factors such as such as environmental noise cause.
Testing circuit 301 is signal detection apparatus.Storer 303 can be also memory device arbitrarily.D/A converting circuit 209, also generate the second simulating signal for the control signal of exporting according to testing circuit 301, common electric voltage generator 211, also eliminate the common electric voltage of noise signal for the second simulating signal that D/A converting circuit 209 is generated and first superimposed, to generate the common electric voltage of the second elimination noise signal, carry out again the above-mentioned common electric voltage by the second elimination noise signal and offer the process of the public electrode (not shown) on testing circuit 301 and display panel, until the noise signal on common electric voltage is eliminated completely.The waveform of the second simulating signal is the inversion waveforms of the waveform of the common electric voltage of the first elimination noise signal, and the voltage magnitude of the waveform of the common electric voltage of the waveform of the second simulating signal and the first elimination noise signal is identical, and voltage direction is contrary.
Storer 303 is for the waveform fluctuation information of the common electric voltage of pre-stored elimination noise signal and the question blank of control signal corresponding relation (lookup table).The peak value of the waveform of the common electric voltage of the elimination noise signal for example detecting is 400mV(millivolt), the waveform correspondence that can store 400mV peak value in question blank is exported to the numerical value of the control signal of D/A converting circuit 209, such as numerical value 1 etc., the waveform of storing 400mV peak value in question blank and the corresponding relation of numerical value of control signal of exporting to D/A converting circuit 209.
When eliminating the controlled signal of waveform fluctuation information of common electric voltage of noise signal according to detect first, can adopt with the following method testing circuit 301:
Testing circuit 301 compares the waveform fluctuation information of the common electric voltage of the elimination noise signal detecting and the corresponding relation being stored in question blank, and controlled signal.Particularly, if eliminate in the waveform fluctuation information of common electric voltage of noise signal, the peak value of waveform is 300mV, the numerical value that the waveform correspondence of the 300mV peak value in storer 303 in the question blank of storage is exported to the control signal of D/A converting circuit 209 is 2, and the control signal that testing circuit 301 obtains from question blank is exactly numerical value 2.
Like this, can thoroughly be eliminated in order to ensure noise in practice, having carried out twice noise eliminates, noise is to be caused by the waveform fluctuation of source electrode and grid output signal for the first time, noise is because other noise existing in actual environment causes in the present embodiment for the second time, twice noise by as above the first embodiment and the present embodiment eliminated, thereby can ensure to eliminate all noises of display device.
As mentioned above, the display device that the present embodiment provides, while also detecting that by testing circuit 301 fluctuation occurs the waveform of the common electric voltage of the first elimination noise signal, according to the controlled signal of waveform fluctuation information, generate the second simulating signal to control D/A converting circuit 209, the common electric voltage that the second simulating signal and first is eliminated noise signal by common electric voltage generator 211 is superimposed, to generate the common electric voltage of the second elimination noise signal, carry out again the above-mentioned common electric voltage by the second elimination noise signal and offer the process of testing circuit 301 and public electrode, until the noise signal on common electric voltage is eliminated completely, thereby can do thoroughly fundamentally the noise producing on display panels, Processing for removing thoroughly, can not bring touch-control to disturb to the touch-screen arranging on display panels.
The 3rd embodiment
Please refer to Fig. 5, it shows the main block architecture diagram of the liquid crystal indicator that third embodiment of the invention provides.It is similar to the liquid crystal indicator shown in Fig. 2 B, and its difference is, liquid crystal indicator also comprises backlight (not shown) and be arranged at the conductive film 401 in backlight, and wherein, backlight is arranged at the display panels below of Fig. 2 A.
D/A converting circuit 209 can be also silver for the first simulating signal being offered to the material of conductive film 401(conductive film).Public electrode 219 can be responded to the first simulating signal on conductive film, thereby makes the noise signal of generation on the first simulating signal and public electrode 219 superimposed, to eliminate the noise signal on common electric voltage.Wherein, the waveform of the first simulating signal is the inversion waveforms of the waveform of the noise signal of generation on public electrode 219, and the waveform of the first simulating signal is identical with the voltage magnitude of the waveform of the noise signal producing on public electrode 219, and voltage direction is contrary.The waveform example of the first simulating signal refers to the related description in first embodiment of the invention.
As mentioned above, the liquid crystal indicator that the present embodiment provides, also by D/A converting circuit 209, the first simulating signal is offered to conductive film, make the noise signal that produces on the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage, can adopt like this various ways that the noise on common electric voltage is eliminated, make liquid crystal indicator can meet the needs without applied environment.
Be below embodiment of the method for the present invention, the details of detailed description not in embodiment of the method, can be with reference to the device embodiment of above-mentioned correspondence.
The 4th embodiment
Please refer to Fig. 6, it shows the process flow diagram of the noise removing method that fourth embodiment of the invention provides.The method can be eliminated process by the performed noise of liquid crystal indicator in the first embodiment; Described noise removing method, can comprise the following steps 601-605:
Step 601, utilizes time schedule controller to produce clock signal according to the noise signal producing on the public electrode detecting, and the clock signal of generation is offered to D/A converting circuit.
Step 603, utilizes the clock signal that D/A converting circuit provides time schedule controller to be converted to the first simulating signal, and the first simulating signal is offered to common electric voltage generator.
The waveform of the first simulating signal is the inversion waveforms of the waveform of the noise signal that produces on public electrode.
Step 605, utilize common electric voltage generator by the first simulating signal and superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to the public electrode being arranged on colored filter substrate.
As mentioned above, the noise removing method that the present embodiment provides, by common electric voltage generator by the first simulating signal with superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the common electric voltage of the first elimination noise signal is offered to the public electrode being arranged on colored filter substrate.The problems such as touch-control interference touch-screen being brought due to the noise producing on public electrode are solved, the embodiment of the present invention can be done Processing for removing fundamentally to the noise producing on display panels, can not bring touch-control to disturb to the touch-screen arranging on display panels.
The 5th embodiment
Please refer to Fig. 7, it shows the process flow diagram of the noise removing method that fifth embodiment of the invention provides.The method can be eliminated process by the performed noise of liquid crystal indicator in the second embodiment; It is similar to the noise removing method shown in Fig. 6, and its difference is, specifically can also comprise: step 701-707 after the step 605 of Fig. 6.
Step 701, utilizes common electric voltage generator that the common electric voltage of the first elimination noise signal is offered to testing circuit.
Whether step 703, utilize testing circuit to detect the first waveform of eliminating the common electric voltage of noise signal and fluctuate, and in the time there is fluctuation, exports control signal to D/A converting circuit.
Step 705, utilizes D/A converting circuit to generate the second simulating signal according to the control signal of testing circuit output.
Step 707, the common electric voltage that utilizes common electric voltage generator that the second simulating signal of D/A converting circuit generation and first is eliminated to noise signal is superimposed, to generate the common electric voltage of the second elimination noise signal.
Generate second eliminate the common electric voltage of noise signal after, then carry out in above-mentioned steps 701, the common electric voltage of eliminating noise signal being offered the process of the public electrode on testing circuit and display panel, until the noise signal on common electric voltage is eliminated completely.
In sum, the noise removing method that the present embodiment provides, while also detecting that by testing circuit fluctuation occurs the waveform of the common electric voltage of the first elimination noise signal, according to the controlled signal of waveform fluctuation information, generate the second simulating signal to control D/A converting circuit, the common electric voltage that the second simulating signal and first is eliminated noise signal by common electric voltage generator is superimposed, to generate the common electric voltage of the second elimination noise signal, carry out again the above-mentioned common electric voltage by the second elimination noise signal and offer the process of testing circuit and public electrode, until the noise signal on common electric voltage is eliminated completely, thereby can do thoroughly fundamentally the noise producing on display panels, Processing for removing thoroughly, can not bring touch-control to disturb to the touch-screen arranging on display panels.
The 6th embodiment
Please refer to Fig. 8, it shows the process flow diagram of the noise removing method that sixth embodiment of the invention provides.The method can be eliminated process by the performed noise of liquid crystal indicator in the 3rd embodiment; It is similar to the noise removing method shown in Fig. 6, and its difference is, also comprises: the step 605 of Fig. 6 specifically can also replace with: step 801.
Step 801, utilize D/A converting circuit that the first simulating signal is offered to conductive film, the first simulating signal on public electrode induction conductive film, make the noise signal that produces on the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage, wherein, conductive film is arranged in the backlight of display panel below.
In sum, the noise removing method that the present embodiment provides, also by D/A converting circuit, the first simulating signal is offered to conductive film, make the noise signal that produces on the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage, can adopt like this various ways that the noise on common electric voltage is eliminated, make liquid crystal indicator can meet the needs without applied environment.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be not depart from technical solution of the present invention content, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a liquid crystal indicator, it is characterized in that, described liquid crystal indicator comprises: on printed circuit board (PCB), display panels, the flexible printed wiring board being connected with display panels with described printed circuit board (PCB), described printed circuit board (PCB), time schedule controller, D/A converting circuit and common electric voltage generator are set, wherein
Described time schedule controller, for producing clock signal according to the noise signal producing on the public electrode detecting, and offers described D/A converting circuit by the clock signal of generation;
Described D/A converting circuit, is converted to the first simulating signal for the clock signal that described time schedule controller is provided, and described the first simulating signal is offered to described common electric voltage generator;
Described common electric voltage generator, be used for described the first simulating signal with superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the described first common electric voltage of eliminating noise signal is offered to described public electrode.
2. liquid crystal indicator according to claim 1, is characterized in that, the waveform of described the first simulating signal is the inversion waveforms of the waveform of the noise signal that produces on described public electrode.
3. liquid crystal indicator according to claim 1, is characterized in that, testing circuit is also set on described printed circuit board (PCB);
Wherein, described common electric voltage generator, for offering described testing circuit by the common electric voltage of the first elimination noise signal;
Whether described testing circuit, fluctuate for detection of the waveform of the common electric voltage of the first elimination noise signal, in the time there is fluctuation, exports control signal to described D/A converting circuit;
Described D/A converting circuit, for generating the second simulating signal according to the control signal of described testing circuit output;
Described common electric voltage generator, the common electric voltage of eliminating noise signal for the second simulating signal and first that described D/A converting circuit is generated is superimposed, to generate the common electric voltage of the second elimination noise signal.
4. liquid crystal indicator according to claim 3, it is characterized in that, storer is also set on described printed circuit board (PCB), described storer is for the waveform fluctuation information of common electric voltage and the question blank of described control signal corresponding relation of pre-stored elimination noise signal, described testing circuit compares the waveform fluctuation information of the common electric voltage of the elimination noise signal detecting and the corresponding relation being stored in question blank, and obtains described control signal.
5. liquid crystal indicator according to claim 1, it is characterized in that, described liquid crystal indicator also comprises backlight and is arranged at the conductive film in backlight, described D/A converting circuit, also for described the first simulating signal is offered to conductive film, described public electrode is responded to the first simulating signal on described conductive film, makes the noise signal that produces on described the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage.
6. a noise removing method, is characterized in that, described noise removing method, comprising:
Utilize time schedule controller to produce clock signal according to the noise signal producing on the public electrode detecting, and the clock signal of generation is offered to D/A converting circuit;
The clock signal that utilizes described D/A converting circuit that described time schedule controller is provided is converted to the first simulating signal, and described the first simulating signal is offered to common electric voltage generator;
Utilize described common electric voltage generator by described the first simulating signal and superimposed with the common electric voltage of noise signal, to generate the common electric voltage of the first elimination noise signal, and the described first common electric voltage of eliminating noise signal is offered to described public electrode.
7. noise removing method according to claim 6, is characterized in that, the waveform of described the first simulating signal is the inversion waveforms of the waveform of the noise signal that produces on described public electrode.
8. noise removing method according to claim 6, is characterized in that, also comprises step:
Utilize described common electric voltage generator that the common electric voltage of the first elimination noise signal is offered to testing circuit;
Utilize described testing circuit to detect the first waveform of eliminating the common electric voltage of noise signal and whether fluctuate, in the time there is fluctuation, export control signal to described D/A converting circuit;
Utilize described D/A converting circuit to generate the second simulating signal according to the control signal of described testing circuit output;
The common electric voltage that utilizes described common electric voltage generator that the second simulating signal of described D/A converting circuit generation and first is eliminated to noise signal is superimposed, to generate the common electric voltage of the second elimination noise signal.
9. noise removing method according to claim 8, it is characterized in that, utilize described testing circuit to detect the first waveform of eliminating the common electric voltage of noise signal and whether fluctuate, in the time there is fluctuation, export control signal in described D/A converting circuit, comprise step:
Utilize described testing circuit that the waveform fluctuation information of the common electric voltage of the elimination noise signal detecting and pre-stored corresponding relation in question blank are compared, and obtain described control signal.
10. noise removing method according to claim 6, is characterized in that, also comprises step:
Utilize described D/A converting circuit that described the first simulating signal is offered to conductive film, described public electrode is responded to the first simulating signal on described conductive film, make the noise signal that produces on described the first simulating signal and public electrode superimposed, to eliminate the noise signal on common electric voltage, described conductive film is arranged in backlight.
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| CN107909955A (en) * | 2017-09-14 | 2018-04-13 | 友达光电股份有限公司 | Anti-interference display panel and anti-interference circuit |
| CN111933078A (en) * | 2020-08-18 | 2020-11-13 | 合肥维信诺科技有限公司 | Organic light emitting diode driving circuit and display panel |
| CN113507329A (en) * | 2021-06-22 | 2021-10-15 | 厦门翔澧工业设计有限公司 | Glass backboard for filtering clutter and equipment with glass backboard |
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| CN103913867B (en) | 2017-01-11 |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |