CN101409052B - Method for reducing display audio noise and drive device thereof - Google Patents
Method for reducing display audio noise and drive device thereof Download PDFInfo
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- CN101409052B CN101409052B CN2007101629966A CN200710162996A CN101409052B CN 101409052 B CN101409052 B CN 101409052B CN 2007101629966 A CN2007101629966 A CN 2007101629966A CN 200710162996 A CN200710162996 A CN 200710162996A CN 101409052 B CN101409052 B CN 101409052B
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Abstract
A method for reducing audio noise of a display comprises the following steps: generating a horizontal synchronizing signal, generating a reference signal and generating a substrate voltage signal. The high level state of the reference signal has a predetermined width; the substrate voltage signal switches the state according to each scanning line corresponding to the horizontal synchronizing signal; during each period of the substrate voltage signal, a rising edge and a falling edge of the substrate voltage signal switches the state based on the high level state of the reference signal, and the state switching time of the rising edge and the falling edge is antedated or delayed based on the reference value of the high level state.
Description
Technical field
The present invention relates to a kind of method that reduces display audio noise, and particularly relate to a kind of method that reduces the audio noise of LCD.
Background technology
Generally speaking, liquid crystal indicator utilizes inversion driving mode to drive each sweep trace on the viewing area, by with the sweep trace counter-rotating, eliminates the Dc bias residue problem on the LCD screen.On real the work, can use opposite polarity voltage to drive liquid crystal to same sweep trace in adjacent pictures.In order to reach this purpose, driving circuit is inversion driving voltage and LCD screen substrate voltage simultaneously.
Fig. 1 shows the sequential synoptic diagram of known liquid crystal display-driving mode.As shown in the figure, in order to realize the reversal of poles of scanning line driving voltage, substrate voltage VCOM must do counter-rotating along with horizontal-drive signal (horizontal synchronization) HSD, and transition opportunity is under the high level state of output enable signal OEV.Because the frequency of horizontal-drive signal HSD is 15kHz, so can find out obviously that by Fig. 1 the frequency of substrate voltage VCOM is 7.5kHz.
But when carrying out this inversion driving program, promptly when the counter-rotating substrate voltage, the frequency that causes substrate voltage VCOM is 7.5kHz.The substrate voltage signal VCOM of this frequency 7.5kHz can resonate with the material production on the LCD screen module, causes having the audio noise of a frequency 7.5kHz.As shown in Figure 2, as can be seen under frequency 7.5kHz, its audio noise is up to 22dB,
The intensity of sound of this audio noise has reached the stage that people's ear can be heard.For the undersized mobile device of general application, mobile phone etc. for example, because LCD screen is pressed close near user's the ear when conversation, this audio noise will influence listening to of user, makes the communication quality variation.
In order to address this problem, known technology use change to sweep time of sweep trace, reduce method such as duration of charging, but all can have influence on display quality or increase the cost of circuit change design.Therefore, reaching as more efficient and mode that more save how and to reduce the influence of this audio noise for the user, is that the problem that solves is badly in need of in this field.
Summary of the invention
Because above-mentioned problem, the present invention proposes a kind of method that reduces display audio noise, and it is applicable to the display of line inversion driving.Method of the present invention produces horizontal-drive signal earlier, produces reference signal and produces a substrate voltage signal, the high level state of reference signal has predetermined width, and the substrate voltage signal then carries out state exchange according to each bar sweep trace of corresponding horizontal-drive signal.In each cycle of substrate voltage signal, the high level state that its rising edge and falling edge are based on reference signal carries out transition, and based on lead or retardation, shifts to an earlier date or postpone the transition opportunity of rising edge and falling edge.Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level, and this lead or this retardation are to adjust with respect to the width of this high level state.
In addition, the present invention also proposes a kind of method that reduces display audio noise.Method of the present invention comprises generation reference signal and substrate voltage signal, and the high level state of reference signal has predetermined width.In each cycle of substrate voltage signal, the high level state that its rising edge and falling edge are based on reference signal carries out transition, and based on lead or retardation, shifts to an earlier date or postpone the transition opportunity of rising edge and falling edge.Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level, and this lead or this retardation are to adjust with respect to the width of this high level state.
According to an embodiment of the present invention, the width of this high level state of above-mentioned reference signal is adjustable.In addition, the reference value of the high level state of reference signal can be the central authorities of its width.
According to embodiments of the present invention, only the transition of the rising edge of substrate voltage signal and falling edge is postponed opportunity or promote.In addition, also can the transition of the rising edge in each cycle of substrate voltage signal and falling edge be postponed opportunity or promote.The variable that postpones or promote of the rising edge in each cycle of substrate voltage signal and falling edge is produced by random number.
In addition, the present invention also proposes a kind of drive device for display, is suitable for the audio noise of the display that reduces the line inversion driving.Drive unit of the present invention comprises signal generator and controller at least.Signal generator in order to produce horizontal-drive signal, reference signal and substrate voltage signal, is given each sweep trace of display, and wherein the high level state of reference signal has predetermined width.Controller makes the substrate voltage signal carry out state exchange according to each bar sweep trace of corresponding horizontal-drive signal.In each cycle of substrate voltage signal, the high level state that its rising edge and falling edge are based on reference signal carries out transition, and based on lead or retardation, shifts to an earlier date or postpone the transition opportunity of rising edge and falling edge.Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level, and this lead or this retardation are to adjust with respect to the width of this high level state.
In one embodiment, above-mentioned reference signal can be an output enable signal.In addition, the width of the high level state of reference signal is adjustable.The reference value of the high level state of reference signal can be the central authorities of width.
In addition, in one embodiment, controller only postpones the transition of the rising edge of substrate voltage signal and falling edge or promote opportunity.In another embodiment, controller postpones the transition of the rising edge in each cycle of this substrate voltage signal and falling edge or promote opportunity.Above-mentioned controller can utilize tandom number generator, the rising edge in each cycle of generation substrate voltage signal and the variable that postpones or promote of falling edge.
In addition, in one embodiment, controller can in be built in the time schedule controller.
The present invention can utilize exhibition method frequently by said method or device under the prerequisite that does not change existing driving specification and circuit framework, reduce the audio noise of display base plate effectively.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the sequential synoptic diagram of known liquid crystal display-driving mode.
Fig. 2 shows according to the audio frequency measurement result of known technology to substrate
Fig. 3 shows the signal schematic representation of method of the reduction display audio noise of the embodiment of the invention.
Fig. 4 shows each signal waveform synoptic diagram of the reduction display audio noise of the embodiment of the invention
Fig. 5 shows each signal waveform synoptic diagram of the reduction display audio noise of another embodiment of the present invention.
The random number that Fig. 6 shows a kind of linear feedback shift register (linear feedback shift register) produces synoptic diagram.
Fig. 7 shows according to the audio frequency measurement result of the technology of the present invention to substrate.
Fig. 8 shows each signal waveform synoptic diagram of the reduction display audio noise of another embodiment of the present invention.
Embodiment
One of technical characterictic of the present invention is to use exhibition method frequently, adjusts the frequency of substrate voltage VCOM, makes its frequency can not be fixed on 7.5kHz.By this, reduce the frequency of occurrences of frequency 7.5kHz and reduce its intensity of sound.For the frequency that can make substrate voltage VCOM can be adjusted, reducing the duration of charging of every sweep trace, that is increase the width of output enable signal (or being called reference signal) OEV at this, reach the frequency of adjusting substrate voltage VCOM.Then, just content of the present invention is described with a plurality of embodiment.
Fig. 3 shows the conceptual schematic view of the reduction display audio noise of the embodiment of the invention.By preceding described can learning, the counter-rotating of substrate voltage VCOM is along with horizontal-drive signal HSD carries out, and is the high level state at output enable signal OEV.Do not changing existing type of drive, and can adjust the frequency of substrate voltage VCOM again, one of method is to set about from the width of output enable signal OEV.
Comparison diagram 1 and Fig. 3, under known framework, the high level state of output enable signal OEV is a pulse basically, and lasting time compole is short, and when detecting this high level state, substrate voltage VCOM just changes state at once.Otherwise, under the framework of present embodiment, as shown in Figure 3, the width widen of output enable signal OEV is become to have time interval t.So under the situation that does not change former input format, the time that signal OEV width (time width) increases to t and every sweep trace charging is fixed as T.Under this situation, just can carry out suitable adjustment transition opportunity of substrate voltage VCOM in the high level state of the width t of signal OEV, use the frequency of eliminating 7.5kHz.
The method of adjusting then is described.Fig. 4 shows each signal waveform synoptic diagram of the reduction display audio noise of the embodiment of the invention.As shown in Figure 4, horizontal-drive signal HSD remains unchanged, and signal OEV increases to t with the width of high level state as described in Figure 3, and the sweep trace duration of charging is fixed on T.Under unjustified, at the falling edge place of approach signal OEV, substrate voltage VCOM draws high and is high level state, and afterwards at the next falling edge place of approach signal OEV, substrate voltage VCOM reduces level state, produces substrate voltage VCOM in this way.Under this situation, substrate voltage VCOM still maintains frequency 7.5kHz.Otherwise, under the mode of operation of present embodiment, because the high level state of signal OEV widened, so the transition of substrate voltage VCOM (promptly, electrical level rising descends) become opportunity and can adjust and meet original input format, i.e. transition under the high level state of signal OEV.
As shown in Figure 4, when substrate voltage VCOM is high level state in next transition, based on the rising edge of signal OEV.That is the time point of transition advances to signal OEV rising edge from original signal OEV falling edge, promptly shifts to an earlier date Δ.Therefore, the Cycle Length of a substrate voltage VCOM clearly just is shortened, that is frequency is reduced to below the 7.5kHz from original 7.5kHz.By this mechanism, just reduce the appearance probability of frequency 7.5kHz, and realize exhibition operation frequently.As a result, the audio noise of frequency 7.5kHz just is lowered and reduces.
Above-mentioned lead Δ for example can be adjusted with respect to the reference value of the high level state of signal OEV.This reference value for example can be set in the central authorities of width.In addition, except shifting to an earlier date Δ, also can adopt the delay Δ.The delay of state or lifting opportunity can be at the rising edges of substrate voltage VCOM.
Fig. 5 shows each signal waveform synoptic diagram of the reduction display audio noise of another embodiment of the present invention.Embodiment shown in Figure 4 only is the most basic sample attitude of the present invention, and it only does fine setting in the transition of substrate voltage VCOM.Be connected on, trickleer exhibition yupin effect is described.
In the present embodiment, suitable adjustment is all done in the substrate voltage VCOM transition of every sweep trace opportunity.As shown in Figure 5, as benchmark, it just is the cycle of a substrate voltage VCOM with the intermediate point of the high level state of signal OEV from first high level state of Fig. 5 to the 3rd OEV.Use as reference, substrate voltage VCOM is a high level from the intermediate point transition of the high level state of signal OEV, intermediate point transition to the high level state of next signal OEV is a low level, at last the intermediate point transition at the high level state of the 3rd signal OEV is high level (interval that dotted line indicates among the figure), its cycle just is half of horizontal-drive signal HSD, that is 7.5kHz.
Under the operation of present embodiment, under first high level state of signal OEV, substrate voltage VCOM transition is high level (corresponding article one sweep trace).But the time point of substrate voltage VCOM transition is from the intermediate point of the high level state of original signal OEV, and to figure left side skew x value, that is time x carries out transition ahead of time.Then, be low level (second sweep trace) to the intermediate point transition of the high level state of second signal OEV, this point is identical with known way.Afterwards, under the 3rd high level state of signal OEV, substrate voltage VCOM transition once more is high level (the 3rd sweep trace).But the time point of substrate voltage VCOM transition is from the intermediate point of the high level state of original signal OEV, and the figure right side is offset the y value again, that is time delay, y carried out transition.Because article one the transition of scanning line substrate voltage VCOM has shifted to an earlier date x opportunity, so next bar sweep trace just must postpone y with transition point on opportunity.Mode thus, as can be seen from Figure 5, the T1 cycle just can that is to say that the frequency in T1 interval will be less than 7.5kHz greater than the cycle of given frequency 7.5kHz.
In like manner, because the transition of the substrate voltage VCOM of the 3rd sweep trace has postponed y opportunity, so opportunity just must be for example done sth. in advance time z in the transition of the substrate voltage VCOM of next bar sweep trace correspondence ahead of time.As above-mentioned reason, can know that in the T2 interval, its frequency will be greater than 7.5kHz.Repeat down in this way, with each transition opportunity of substrate voltage VCOM, the operation of doing sth. in advance or postponing with respect to intermediate value, and allow ahead of time or the time variable (as above-mentioned x, y, z) that postpones is carried out with random value, just can reach exhibition effect frequently.
The producing method of random variable values such as above-mentioned x, y, z has a variety of, and give an example below and do simple declaration, but non-in order to restriction the present invention.The random number that Fig. 6 shows a kind of linear feedback shift register (linear feedback shift register) produces synoptic diagram.Figure 6 shows that the mode of false noise code (pseudo noise code), utilize linear feedback shift register to produce random number output.In the example of Fig. 6, the proper polynomial of its recurrence relation example (characteristicpolynomial) is g (x)=x
4+ x
3+ 1, and initial value is 0001.This group random number cycle is 15 as can be seen from following table 1.In addition, can increase the complexity of proper polynomial, just can obtain more random number, and the cycle is bigger.In general, the random number of generation is many more, the cycle is big more, and its exhibition effect frequently is also just good more, and the effect of eliminating audio noise naturally is also just good more.
Table 1
| D 3 | D 2 | D 1 | D 0 |
| 1 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1 |
| 0 | 0 | 1 | 1 |
| 0 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 |
| D 3 | D 2 | D 1 | D 0 |
| 1 | 1 | 1 | 0 |
| 1 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 1 |
| 0 | 1 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 0 | 0 | 1 |
| 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 |
Fig. 7 shows according to the audio frequency measurement result of the technology of the present invention to substrate.Through behind the exhibition frequency method of present embodiment, can know clearly that by audio distribution result after the exhibition frequently of Fig. 7 the intensity of sound of frequency 7.5kHz has reduced, reach the degree that people's ear can't be felt.That is the frequency of occurrences step-down of 7.5kHz also reduces its intensity of sound to 8dB, and this intensity people ear can't be heard.Therefore, according to method proposed by the invention, the audio noise of the frequency 7.5kHz of substrate voltage can be lowered really effectively.
Fig. 8 shows each signal waveform synoptic diagram of the reduction display audio noise of another embodiment of the present invention.Mode of operation and Fig. 5 of Fig. 8 are similar, and the level that only is worse than initial substrate voltage VCOM is a low level, at this moment, and the delay of state exchange or occur in falling edge in advance.Except that this, all the other detailed descriptions can be omitted its explanation at this with reference to the explanation of figure 5.
In the above description, horizontal-drive signal, reference (output enable) signal and substrate voltage signal can be produced by signal generator.The rising edge of above-mentioned substrate voltage or the operation of falling edge can be undertaken by a controller.This controller can be provided with in addition, or the program of rewriting existing time schedule controller realizes.
In sum, the present invention can utilize exhibition method frequently by said method or device under the prerequisite that does not change existing driving specification and circuit framework, reduce the audio noise of display base plate effectively.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, those skilled in the art, under the premise without departing from the spirit and scope of the present invention; when can doing some changes and modification, so protection scope of the present invention is when being as the criterion with claim of the present invention.
Claims (21)
1. method that reduces display audio noise is applicable to the display of line inversion driving, and the method for this reduction display audio noise comprises:
Produce a horizontal-drive signal;
Produce a reference signal, wherein a high level state of this reference signal has a predetermined width;
Produce a substrate voltage signal, according to each bar sweep trace that should horizontal-drive signal is carried out state exchange, wherein in each cycle of this substrate voltage signal, this high level state that its rising edge and falling edge are based on this reference signal carries out transition, and based on lead or retardation, in advance or postpone the transition opportunity of this rising edge and this falling edge
Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level,
Wherein this lead or this retardation are to adjust with respect to the width of this high level state.
2. the method for reduction display audio noise as claimed in claim 1, wherein this reference signal is an output enable signal.
3. the method for reduction display audio noise as claimed in claim 1, wherein this width of this high level state of this reference signal is adjustable.
4. the method for reduction display audio noise as claimed in claim 1, wherein this reference value of this high level state of this reference signal is the central authorities of this width.
5. the method for reduction display audio noise as claimed in claim 1 wherein only postpones the transition of this rising edge of this substrate voltage signal and this falling edge or promote opportunity.
6. the method for reduction display audio noise as claimed in claim 1 wherein postpones the transition of this rising edge in each cycle of this substrate voltage signal and this falling edge or promote opportunity.
7. the method for reduction display audio noise as claimed in claim 6, wherein the variable that postpones or promote of this rising edge in each cycle of this substrate voltage signal and this falling edge is produced by random number.
8. method that reduces display audio noise comprises:
Produce a reference signal, wherein a high level state of this reference signal has a predetermined width;
Produce a substrate voltage signal, in each cycle of this substrate voltage signal, its rising edge and falling edge carry out transition based on this high level state of this reference signal, and based on lead or retardation, in advance or postpone the transition opportunity of this rising edge and this falling edge
Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level,
Wherein this lead or this retardation are to adjust with respect to the width of this high level state.
9. the method for reduction display audio noise as claimed in claim 8, wherein this width of this high level state of this reference signal is adjustable.
10. the method for reduction display audio noise as claimed in claim 8, wherein this reference value of this high level state of this reference signal is the central authorities of this width.
11. the method for reduction display audio noise as claimed in claim 8 wherein only postpones the transition of this rising edge of this substrate voltage signal and this falling edge or promote opportunity.
12. the method for reduction display audio noise as claimed in claim 8 wherein postpones the transition of this rising edge in each cycle of this substrate voltage signal and this falling edge or promote opportunity.
13. the method for reduction display audio noise as claimed in claim 12, wherein the variable that postpones or promote of this rising edge in each cycle of this substrate voltage signal and this falling edge is produced by random number.
14. a drive device for display, the suitable audio noise that reduces the display of line inversion driving, this drive unit comprises at least:
One signal generator in order to produce a horizontal-drive signal, a reference signal and a substrate voltage signal, is given each sweep trace of this display, and wherein a high level state of this reference signal has a predetermined width; And
One controller, make this substrate voltage signal according to each bar sweep trace that should horizontal-drive signal is carried out state exchange, wherein in each cycle of this substrate voltage signal, its rising edge and falling edge carry out transition based on this high level state of this reference signal, and based on lead or retardation, in advance or postpone the transition opportunity of this rising edge and this falling edge
Wherein the transition of this rising edge is meant that this substrate voltage signal becomes high level by low level, and the transition of this falling edge is meant that this substrate voltage signal becomes low level by high level
Wherein this lead or this retardation are to adjust with respect to the width of this high level state.
15. drive device for display as claimed in claim 14, wherein this reference signal is an output enable signal.
16. drive device for display as claimed in claim 14, wherein this width of this high level state of this reference signal is adjustable.
17. drive device for display as claimed in claim 14, wherein this reference value of this high level state of this reference signal is the central authorities of this width.
18. drive device for display as claimed in claim 14, wherein this controller only postpones the transition of this rising edge of this substrate voltage signal and this falling edge or promote opportunity.
19. drive device for display as claimed in claim 14, wherein this controller postpones the transition of this rising edge in each cycle of this substrate voltage signal and this falling edge or promote opportunity.
20. drive device for display as claimed in claim 19, wherein this controller utilizes a tandom number generator, produces this rising edge in each cycle of this substrate voltage signal and the variable that postpones or promote of this falling edge.
21. drive device for display as claimed in claim 19 wherein is built in the time schedule controller in this controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482507A (en) * | 2002-07-25 | 2004-03-17 | Nec液晶技术株式会社 | Liquid-crystal display device and driving method thereof |
| US20070097057A1 (en) * | 2005-10-31 | 2007-05-03 | Shin Jung W | Liquid crystal display and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482507A (en) * | 2002-07-25 | 2004-03-17 | Nec液晶技术株式会社 | Liquid-crystal display device and driving method thereof |
| US20070097057A1 (en) * | 2005-10-31 | 2007-05-03 | Shin Jung W | Liquid crystal display and driving method thereof |
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