CN101276558B - Method and apparatus for prevention of interference video - Google Patents
Method and apparatus for prevention of interference video Download PDFInfo
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- CN101276558B CN101276558B CN2007100919834A CN200710091983A CN101276558B CN 101276558 B CN101276558 B CN 101276558B CN 2007100919834 A CN2007100919834 A CN 2007100919834A CN 200710091983 A CN200710091983 A CN 200710091983A CN 101276558 B CN101276558 B CN 101276558B
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Abstract
A method capable of preventing video interference is used for prevent a lamp tube control signal of a liquid crystal display from interfering a video signal, the method comprises adjusting the frequency of the liquid crystal lamp tube control signal, so that the frequency spectrum of the control signal is interlaced with the frequency spectrum of the video signal.
Description
Technical field
The present invention relates to a kind of display and driving method thereof, and design a kind of display and driving method thereof that overcomes the signal of video signal interference that have especially.
Background technology
Apparatus for lighting up (Inverter) is exactly to transfer electric current the high-voltage converter of interchange to from direct current, is used for the light source of a bright display, for example lights the cold cathode fluorescent lamp (CCFL) of panel.
Traditionally, the mode of lighting cold cathode fluorescent lamp has two kinds, and a kind of is continuation drive point modulator ignition mode (Continue mode), and another kind is an intermittent drive point modulator ignition mode (Burst mode).Wherein the mode lighted of continuation drive point modulator consumes bigger power, and therefore, under the situation that environmental consciousness comes back now, intermittent drive point modulator ignition mode gradually becomes main flow.
But because apparatus for lighting up is to use high voltage to light cold cathode fluorescent lamp, thus its start with the moment of closing can interference images signal, cause picture local or comprehensively inhomogeneous and form water ripple phenomenon.
Therefore, need a kind ofly to reduce consumed power but can not produce that signal of video signal disturbs or the apparatus for lighting up driving method of water ripple phenomenon.
Summary of the invention
Therefore one object of the present invention is exactly that a kind of driving method of apparatus for lighting up is being provided, and uses avoiding interference signal of video signal.
According to above-mentioned purpose of the present invention, a kind of method that prevents interference images is proposed, be used to prevent the working signal interference images signal of the fluorescent tube of LCD, comprise the frequency of adjusting this liquid crystal lamp works signal, make frequency spectrum and this signal of video signal frequency interlace of this working signal.
According to above-mentioned purpose of the present invention, a kind of device that prevents interference images is more proposed, prevent the working signal interference images signal of the fluorescent tube of LCD, this device comprises scale controller (scalar), be used for exporting the working signal of this fluorescent tube according to first signal, and apparatus for lighting up (inverter), it couples this scale controller, be used for lighting a backlight according to the working signal of this fluorescent tube, wherein the frequency that has of the working signal of this fluorescent tube makes that the frequency spectrum of the frequency spectrum of this working signal and this signal of video signal is interlaced with each other.
Therefore the present invention can avoid the formed water ripple phenomenon of phase mutual interference between the two by the frequency spectrum of the working signal of apparatus for lighting up and the frequency spectrum of signal of video signal are staggered fully.
Description of drawings
For above-mentioned and other purposes of the present invention, feature, advantage and embodiment can be become apparent, below accompanying drawing is illustrated:
Figure 1 shows that according to one embodiment of present invention signal of video signal is carried out the spectrogram that presented behind the Fourier transform on frequency domain;
Figure 2 shows that apparatus for lighting up operation circuit figure according to an embodiment of the invention; And
Figure 3 shows that operational flowchart of the present invention.
[main element symbol description]
201 scale controllers
202 apparatus for lighting up
203 filtering circuits
301～303 steps
Embodiment
In signal of video signal, comprise multiple vision signal, for example voltage and current amplitude, gain, frequency, power etc.When analyzing this signal of video signal, the signal of video signal that this can be contained many frequencies is by mathematic(al) manipulation, and for example the Fourier transform mode presents it with the frequency domain mode, thus the characteristic of show image signal in frequency domain.
Figure 1 shows that according to one embodiment of present invention signal of video signal is carried out the spectrogram that presented behind the Fourier transform on frequency domain.Wherein transverse axis is a frequency, and the longitudinal axis is an amplitude.According to this spectrogram, between any two adjacent frequencys multiplication, for example 102 of a frequency multiplication 101 and two frequencys multiplication or two frequencys multiplication 102 and frequency tripling are 103, and no signal transmits.In other words, if the frequency spectrum of the working signal of the apparatus for lighting up of light source and the frequency spectrum of signal of video signal can stagger mutually, that is each frequency multiplication in the frequency spectrum of working signal is arranged between the adjacent frequency multiplication of frequency spectrum of signal of video signal successively, then this working signal can not influence signal of video signal, can avoid the interfering with each other and then generation water ripple phenomenon of working signal and signal of video signal.
Figure 2 shows that apparatus for lighting up operation circuit figure according to an embodiment of the invention.Apparatus for lighting up 202 couples scale controller (scalar controller) 201.And the amplification that scale controller 201 is used for adjusting display frame automatically according to the size of panel of LCD with dwindle.Wherein the Control Software of scale controller 201 can be according to the vertical synchronizing signal (V of LCD
Sync) (pulse width modulation, PWM) signal send apparatus for lighting up 202 to behind the wave circuit 203 after filtration, are used for the intermittent cold cathode fluorescent lamp that drives to produce pulse-length modulation.
According to the present invention, can allow the formed frequency spectrum of working signal of apparatus for lighting up between the frequency spectrum of signal of video signal, avoid water ripple phenomenon in the position successively.In one embodiment, according to signal of video signal spectrogram shown in Figure 1 since in the middle of a frequency multiplication and two frequencys multiplication and no signal transmit, so can 1.5 frequency multiplication places avoid water ripple phenomenon so that 1 frequency multiplication of working signal frequency spectrum is positioned at the signal of video signal frequency spectrum.And in other embodiment, 1 frequency multiplication of working signal frequency spectrum also can be arranged in the signal of video signal spectrogram other do not have the part that signal transmits, for example 2.5 frequency multiplication places or 3.5 frequency multiplication places etc.In another embodiment, if image is scanning direction or locating up and down to the scanning of place, centre by picture up and down respectively from the picture centre respectively, then the sweep signal place's required time of part in the middle of the picture of scanning is 1/2nd picture frame time, that is the sweep signal frequency will be the twice of its primary frequency, if the frequency setting of the signal of video signal of system is synchronous with sweep signal at this moment, then the frequency of signal of video signal also must become twice; Therefore, making 1 frequency multiplication of working signal frequency spectrum be arranged in the embodiment that signal of video signal frequency spectrum 1.5 frequency multiplication places avoid producing the signal interference thus, the vertical synchronizing signal (V of its input scale controller 201
Sync) just need become original 3 times (1.5 * 2=3 frequencys multiplication), make modulator 202 employed pulse width modulating signals in reference mark also become original 3 times, that is make 1 frequency multiplication of working signal frequency spectrum can be positioned at 3 frequency multiplication places of former signal of video signal frequency spectrum.
Figure 3 shows that operational flowchart of the present invention, consult Fig. 2 simultaneously.In step 301, scale controller 201 can detect employed at that time vertical synchronizing signal size, and in step 302 this vertical synchronizing signal is read.Because in the present embodiment, make 1 frequency multiplication of working signal frequency spectrum be positioned at signal of video signal frequency spectrum 1.5 frequency multiplication places and avoid water ripple phenomenon, therefore in step 303, vertical synchronizing signal (V
Sync) frequency multiplication becomes original 3 times, makes modulator 202 employed pulse width modulating signals in reference mark also become original 3 times.
Comprehensive above-mentioned institute says, the present invention staggers with the frequency spectrum of signal of video signal fully by the frequency spectrum with the working signal of apparatus for lighting up, so can avoid phase mutual interference between the two, and then avoids producing formed water ripple phenomenon.In addition, 1 frequency multiplication of the frequency spectrum of working signal also can be arranged in the signal of video signal frequency spectrum, and each does not have the part that signal transmits, and is therefore, quite convenient in design.And, can be according to the vertical synchronizing signal (V of input
Sync) revise the frequency spectrum of working signal immediately, so can effectively improve water ripple phenomenon.
Though adopted preferred embodiment to disclose the present invention; but it is not to be used to limit the present invention; those skilled in the art can carry out various changes and increase under the situation that does not break away from the spirit and scope of the present invention, so protection scope of the present invention is determined by subsidiary claim.
Claims (11)
1. method that prevents interference images is used to prevent the working signal interference images signal of the light source of display, and described method comprises:
Adjust the frequency of the working signal of described light source, make that the working signal frequency spectrum of described light source and described signal of video signal frequency spectrum are staggered fully.
The method of claim 1, wherein each frequency multiplication in the working signal frequency spectrum of described light source between the adjacent frequency multiplication of described signal of video signal frequency spectrum.
3. the method for claim 1, wherein described signal of video signal frequency spectrum comprises first frequency multiplication and second frequency multiplication, and the working signal frequency spectrum of described light source comprises frequency tripling, and it is between described first frequency multiplication and described second frequency multiplication.
4. method as claimed in claim 3, wherein, the frequency of described frequency tripling is 1.5 times of frequency of described first frequency multiplication.
5. method as claimed in claim 3, wherein, the frequency of described frequency tripling is 3 times of frequency of described first frequency multiplication.
6. device that prevents interference images is used to prevent the working signal interference images signal of the light source of display, and described device comprises:
Scale controller is used for exporting according to first signal working signal of described light source; And
Apparatus for lighting up couples described scale controller, is used for lighting described light source according to the working signal of described light source, and wherein, the frequency that the working signal of described light source has makes described working signal frequency spectrum and described signal of video signal frequency spectrum staggered fully each other,
Wherein, described first signal is a vertical synchronizing signal.
7. device as claimed in claim 6, wherein, the working signal of described light source is a pulse width modulating signal.
8. device as claimed in claim 6, wherein, each frequency multiplication in the working signal frequency spectrum of described light source is between the adjacent frequency multiplication of described signal of video signal frequency spectrum.
9. device as claimed in claim 6, wherein, described signal of video signal frequency spectrum comprises first frequency multiplication and second frequency multiplication, and the working signal frequency spectrum of described light source comprises frequency tripling, and it is between described first frequency multiplication and described second frequency multiplication.
10. device as claimed in claim 9, wherein, the frequency of described frequency tripling is 1.5 times of frequency of described first frequency multiplication.
11. device as claimed in claim 9, wherein, the frequency of described frequency tripling is 3 times of frequency of described first frequency multiplication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100919834A CN101276558B (en) | 2007-03-30 | 2007-03-30 | Method and apparatus for prevention of interference video |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100919834A CN101276558B (en) | 2007-03-30 | 2007-03-30 | Method and apparatus for prevention of interference video |
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| Publication Number | Publication Date |
|---|---|
| CN101276558A CN101276558A (en) | 2008-10-01 |
| CN101276558B true CN101276558B (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100919834A Expired - Fee Related CN101276558B (en) | 2007-03-30 | 2007-03-30 | Method and apparatus for prevention of interference video |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111261126B (en) * | 2020-03-24 | 2022-03-18 | 合肥京东方光电科技有限公司 | Display panel driving method and device and display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1216433A (en) * | 1997-10-16 | 1999-05-12 | 株式会社东金 | Cold-cathode tube lighting circuit with protection circuit for piezoelectric transformer |
| CN1296255A (en) * | 1999-10-28 | 2001-05-23 | 索尼株式会社 | Liquid display apparatus and method |
| CN1517968A (en) * | 2003-01-24 | 2004-08-04 | 三星电子株式会社 | Back-light driving equipment for liquid crystal equipment |
-
2007
- 2007-03-30 CN CN2007100919834A patent/CN101276558B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1216433A (en) * | 1997-10-16 | 1999-05-12 | 株式会社东金 | Cold-cathode tube lighting circuit with protection circuit for piezoelectric transformer |
| CN1296255A (en) * | 1999-10-28 | 2001-05-23 | 索尼株式会社 | Liquid display apparatus and method |
| CN1517968A (en) * | 2003-01-24 | 2004-08-04 | 三星电子株式会社 | Back-light driving equipment for liquid crystal equipment |
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|---|---|
| CN101276558A (en) | 2008-10-01 |
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Granted publication date: 20100908 Termination date: 20160330 |