CN1845650B - Display tube frequency control system and its method - Google Patents
Display tube frequency control system and its method Download PDFInfo
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- CN1845650B CN1845650B CN 200510063287 CN200510063287A CN1845650B CN 1845650 B CN1845650 B CN 1845650B CN 200510063287 CN200510063287 CN 200510063287 CN 200510063287 A CN200510063287 A CN 200510063287A CN 1845650 B CN1845650 B CN 1845650B
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- frequency
- fluorescent tube
- frequency control
- reversing mode
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Abstract
The related frequency control system for display tube comprises: a drive controller with a drive mode selector with at least two modes to output at least one frequency control signal by the selected mode, and a tube frequency controller to obtain the corresponding tube frequency according to control signal. This invention can overcome the ripple interference.
Description
Technical field
The present invention relates to a kind of frequency control system and method, in particular to a kind of display tube frequency control system and method.
Background technology
As shown in Figure 1, at present display (for example: fluorescent tube 11 liquid crystal display) is by transducer 12 direct current to be converted to interchange, to supply with the required power supply of fluorescent tube.And, the display floater 15 of display is that the drive pattern of this drive unit 16 has at present by drive unit 16 demonstration that drives: the multiple drive modes such as some reversing mode (dot inversion) and row reversing mode (column inversion).Each drive pattern has different type of drive and scans frequency.
At present known operating frequency at this transducer with scan the frequency lower water ripples that can produce that influence each other and disturb (water flow noise) phenomenon.The solution that routine is improved water ripple phenomenon has three kinds.First method is to come shield electromagnetic interference with indium oxide layer of tin (ITO).Second method is to adopt the transducer operating frequency that scans Frequency Synchronization with level.The third method is opposite with adjacent two tubes polarity, thereby offsets the electric field interference strength and then alleviate the water ripples interference phenomenon.
Yet the cost of first method is higher, and the ITO layer is understood because quality problems are grown and yellow service time the problem of generation color and luster deviation.Accurately locking level of second method scans frequency, if deviation is slightly arranged, the water ripples interference phenomenon will occur immediately so.The third mode only can alleviate the water ripples interference phenomenon, can't thoroughly solve the water ripples interference phenomenon.
In addition, present drive unit 16 have at least two can switching controls drive pattern (for example: some reversing mode and row reversing mode), under the drive pattern switching controls, can't accurately lock certain level and scan frequency to cooperate the operating frequency of transducer.Therefore, on the display of the drive unit with at least two drive patterns, can't solve the water ripples interference phenomenon with second method.
Therefore, be necessary to provide display tube frequency control system and the method for a kind of innovation and tool progressive, to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of display tube frequency control system, it comprises: a driving control device and a fluorescent tube frequency control apparatus.This driving control device has a drive pattern selector, with selecting one of them at least two drive patterns of cause, according to the drive pattern of this selection, exports at least one corresponding frequency control signal.This fluorescent tube frequency control apparatus is obtained at least one corresponding fluorescent tube frequency according to this frequency control signal.
Display tube frequency control system of the present invention is to obtain corresponding fluorescent tube frequency according to different drive patterns, owing to this fluorescent tube frequency can be adjusted accordingly, to cooperate different drive patterns.Therefore, can adjust this fluorescent tube frequency at the frequency zone of anhydrous moire disturbance, thereby utilize display tube frequency control system of the present invention can solve the water ripples interference phenomenon.
Description of drawings
Fig. 1 is the schematic diagram of display lighting tube FREQUENCY CONTROL commonly used and driving control display device panel;
Fig. 2 A is the water ripples interference spectrum analysis chart in a reversing mode;
Fig. 2 B is the water ripples interference spectrum analysis chart in a reversing mode; With
Fig. 3 is the schematic diagram of display tube frequency control system of the present invention.
Embodiment
Referring to Fig. 2 A and Fig. 2 B, it shows the spectrum analysis that water ripples are disturbed.Wherein Fig. 2 A is the spectrum analysis that the water ripples under a reversing mode are disturbed, and it is presented at 41K does not have the water ripples interference phenomenon between the frequency of 48.5KHz.With reference to figure 2B, Fig. 2 B is the spectrum analysis that the water ripples under the row reversing mode are disturbed in addition, and it is presented at 29.5K does not have the water ripples interference phenomenon between the frequency of 36.5KHz.
With reference to figure 3, display tube frequency control system 30 of the present invention comprises: a driving control device 31 and a fluorescent tube frequency control apparatus 32.This driving control device 31 has a drive pattern selector 311, with selecting one of them at least two drive patterns of cause, according to the drive pattern of this selection, exports at least one corresponding frequency control signal 312.
These drive patterns of this driving control device 31 can be a reversing mode, row reversing mode or other drive pattern, describe as an example of a reversing mode and row reversing mode example in the present embodiment.This drive pattern selector 311 choice point reversing mode or row reversing mode.After these drive pattern selector 311 choice point reversing mode were drive pattern, this frequency control signal 312 was set as high potential (H); After this drive pattern selector 311 selected the row reversing mode to be drive pattern, this frequency control signal 312 was set as low potential (L).
And after these drive pattern selector 311 choice point reversing mode were drive pattern, the display floater 33 of this display was some reversing mode driver 313 demonstrations that drive by this driving control device 31; After this drive pattern selector 311 selected the row reversing mode to be drive pattern, the display floater 33 of this display was row reversing mode driver 314 demonstrations that drive by this driving control device 31.
Fluorescent tube frequency control apparatus 32 receives this this frequency control signal 312 and according to this frequency control signal 312, obtains at least one corresponding fluorescent tube frequency.In the present embodiment, fluorescent tube frequency control apparatus 32 utilizes a corresponding table 321, so that obtain corresponding fluorescent tube frequency.Therefore, when this correspondence table 321 receives the frequency control signal 312 of high potential, represent that these drive pattern selector 311 choice point reversing mode are drive pattern, setting fluorescent tube frequency is one of them frequency between 44 ± 3KHz (shown in Fig. 2 A, not having water ripples to disturb in this frequency range).When this correspondence table 321 receives this frequency control signal 312 of low potential, represent that it is drive pattern that this drive pattern selector 311 is selected the row reversing mode, setting fluorescent tube frequency is one of them frequency between 33 ± 3KHz (shown in Fig. 2 B, anhydrous moire disturbance in this frequency range).
Outputed to a transducer 322 of fluorescent tube frequency control apparatus 32 by this obtained fluorescent tube frequency of this correspondence table 321.This transducer 322 is operating frequency according to this fluorescent tube frequency, carries out direct current to the conversion that exchanges, to provide fluorescent tube 34 required power supplys.
Because the operating frequency of this transducer 322 can be adjusted accordingly, to cooperate different drive patterns.Therefore, no matter this driving control device 31 is choice point reversing mode or row reversing mode, the operating frequency of this transducer 322 can be switched to and can not produce the frequency that water ripples are disturbed, and under the operation of this operating frequency, makes display can not produce the phenomenon that water ripples are disturbed.
In order to make the current stabilization of fluorescent tube 34, display tube frequency control system 30 of the present invention also comprises a feedback circuit 35, in order to the feed-back compensation lamp current, although make this fluorescent tube 34 under different operating frequencies is switched, still can stablize the electric current of this fluorescent tube 34.
Above-described embodiment only is used for principle of the present invention and its effect are described, and unrestricted the present invention.Therefore, one of ordinary skill in the art can make amendment to above-described embodiment under the prerequisite of spirit of the present invention and change.Interest field of the present invention should be listed such as aforementioned claims scope.
Claims (8)
1. display tube frequency control system, it comprises:
A driving control device, it has a drive pattern selector, with selecting one of them at least two drive patterns of cause, according to the drive pattern of described selection, exports at least one corresponding frequency control signal;
A fluorescent tube frequency control apparatus that is used for driving a fluorescent tube, it obtains at least one corresponding fluorescent tube frequency according to described frequency control signal, and wherein said fluorescent tube frequency is provided to described fluorescent tube to control described fluorescent tube;
Wherein said two drive patterns are a reversing mode and row reversing mode, and the corresponding fluorescent tube frequency of described some reversing mode is 44 ± 3KHz; The corresponding fluorescent tube frequency of described row reversing mode is 33 ± 3KHz.
2. display tube frequency control system according to claim 1, it also comprises a transducer, described transducer carries out direct current to the conversion that exchanges in order to be operating frequency according to described fluorescent tube frequency.
3. display tube frequency control system according to claim 1, wherein said fluorescent tube frequency control apparatus have a corresponding table, according to described frequency control signal, obtain at least one corresponding fluorescent tube frequency.
4. display tube frequency control system according to claim 1, the corresponding frequency control signal of wherein said some reversing mode is high potential; The corresponding frequency control signal of described row reversing mode is low potential.
5. display tube frequency control system according to claim 1, wherein said fluorescent tube frequency control apparatus also comprises a feedback circuit, to be used for the feed-back compensation lamp current, to stablize lamp current.
6. display lighting tube control method for frequency, it may further comprise the steps:
(a) by selecting one of them at least two drive patterns;
(b) according to the drive pattern of described selection, export at least one corresponding frequency control signal;
(c) according to described frequency control signal, obtain at least one corresponding fluorescent tube frequency, and with described fluorescent tube frequency provide to a fluorescent tube to control described fluorescent tube;
Wherein said two drive patterns are a reversing mode and row reversing mode, and the corresponding fluorescent tube frequency of described some reversing mode is 44 ± 3KHz; The corresponding fluorescent tube frequency of described row reversing mode is 33 ± 3KHz.
7. display lighting tube control method for frequency according to claim 6, it also comprises a switch process, carries out direct current to the conversion that exchanges according to described fluorescent tube frequency.
8. display lighting tube control method for frequency according to claim 6, it also comprises a feedback step, to be used for the feed-back compensation lamp current, to stablize lamp current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510063287 CN1845650B (en) | 2005-04-08 | 2005-04-08 | Display tube frequency control system and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510063287 CN1845650B (en) | 2005-04-08 | 2005-04-08 | Display tube frequency control system and its method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1845650A CN1845650A (en) | 2006-10-11 |
| CN1845650B true CN1845650B (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510063287 Expired - Fee Related CN1845650B (en) | 2005-04-08 | 2005-04-08 | Display tube frequency control system and its method |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540617A (en) * | 2003-04-21 | 2004-10-27 | 三星电子株式会社 | Power source and LCD device and drive method thereof |
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- 2005-04-08 CN CN 200510063287 patent/CN1845650B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540617A (en) * | 2003-04-21 | 2004-10-27 | 三星电子株式会社 | Power source and LCD device and drive method thereof |
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| CN1845650A (en) | 2006-10-11 |
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Granted publication date: 20130227 Termination date: 20160408 |