CN1525429A - Apparatus and method for dynamically adjusting discontinuous modal switch frequency value of liquid crystal display - Google Patents
Apparatus and method for dynamically adjusting discontinuous modal switch frequency value of liquid crystal display Download PDFInfo
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- CN1525429A CN1525429A CNA031049451A CN03104945A CN1525429A CN 1525429 A CN1525429 A CN 1525429A CN A031049451 A CNA031049451 A CN A031049451A CN 03104945 A CN03104945 A CN 03104945A CN 1525429 A CN1525429 A CN 1525429A
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- discontinuous mode
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Abstract
The invention discloses a kind of discrete modality switch frequency dynamic adjusting method for liquid crystal monitor. The method includes following steps: (a) receives a scanning frequency transmitted form a signal source end; (b) it adjusts and acquires a discrete modality switch frequency according to the scanning frequency value; and (c) transmits the frequency of discrete modality to a strip lamp controller. The method in the invention can be calculation or table inquiring method, in order to adjust and acquires the switch frequency. The best parameter of the switch frequency can be acquired by multiplying the scanning frequency with (N+0.5), N is a natural number, and the range of the switch frequency is +/- 20 Hz. The invention uses different scanning frequency to adjust and acquire the best switch frequency. The switch frequency can be adjusted with the scanning frequency, in order to eliminate the ripple phenomenon.
Description
Technical field
The present invention relates to a kind of dynamic adjusting method and device of frequency, in detail, relate to a kind of method of adjustment and device that is used for the discontinuous mode switch frequency values of LCD.
Background technology
Present LCD uses cold cathode fluorescent lamp (CCFL) as backlight mostly, thus must use the alternating current of high pressure to drive and the length ratio (Duty cycle) that changes switching time to change brightness.With reference to shown in Figure 1, in LCD, must utilize a controller 11 and to switch circuit (Inverter) 12 usually, with the fluorescent tube 13 of lighting LCD and the brightness of controlling this fluorescent tube 13.This controller 11 can be provided with this commutation circuit 12 and separate, or is combined into a module with this commutation circuit 12.
With reference to figure 2A and Fig. 2 B, the pattern of lighting fluorescent tube and control lighting tube brightness has two kinds: continuous mode (Continuous Mode) and discontinuous mode (Burst Mode).The control signal waveform of mode is shown in Fig. 2 A continuously, and the control signal frequency of mode is 30-70KHz continuously, and utilizes the brightness of the amplitude of this control signal with the adjustment fluorescent tube.
The control waveform of discontinuous mode is shown in Fig. 2 B, the control signal frequency of discontinuous mode also is 30-70KHz, the control signal of this discontinuous mode has a switching frequency in addition and is about 100-500Hz, and with the length ratio (Duty cycle) of switching time of control signal waveform to adjust the brightness of fluorescent tube.
Present most LCD is the control model of adopting discontinuous mode, and this switching frequency is different because of the design of each manufacturer, and all is fixed in a certain switching frequency value.LCD must receive the one scan frequency values that is transmitted by a signal source end, and to carry out the scanning of screen-picture, this signal source end can be the setting of computer terminal display card or the software set of computer terminal, so this sweep frequency value and on-fixed.Yet, the observable water ripple phenomenon of human eye (water flow) can take place, and because of the difference of sweep frequency value, this ripples line scrolling up sometimes, is downward scrolling sometimes when some sweep frequency value, the speed of its scrolling is also different.Show that according to experiment the phenomenon of ripples line should be relevant with sweep frequency and switching frequency.
Therefore, be necessary to provide the discontinuous mode switch frequency values dynamic development adjustment of a kind of innovation and rich progressive in fact, to address the above problem.
Summary of the invention
The method that the object of the present invention is to provide a kind of discontinuous mode switch frequency values that is used for LCD dynamically to adjust may further comprise the steps: (a) receive the one scan frequency values that is transmitted by a signal source end; (b) according to this sweep frequency value, adjust the switching frequency value of a discontinuous mode; Reach switching frequency value to a lamp tube controller that (c) transmits this discontinuous mode.
Dynamic adjusting method of the present invention can or be looked into the method for corresponding tables with Calculation Method, with adjust this switching frequency value.This switching frequency value the best is this sweep frequency multiple with (N+0.5) on duty, and N is a natural number, and the permissible range of this switching frequency value is ± 20Hz.Utilize the different sweep frequency value of method system's foundation of the present invention, the switching frequency value of dynamically adjusting bestly.Therefore, no matter the signal source end provides arbitrary sweep frequency value, this switching frequency value is dynamically adjusted thereupon, eliminating or to alleviate water ripple phenomenon, thereby makes human eye can not experience water ripple phenomenon.
Description of drawings
Fig. 1 lights and the synoptic diagram of brightness for control fluorescent tube in the LCD;
Fig. 2 A is the control signal oscillogram of continuous mode;
Fig. 2 B is the control signal oscillogram of discontinuous mode;
Fig. 3 is the process flow diagram that is used for the discontinuous mode switch frequency values dynamic adjusting method of LCD of the present invention; And
Fig. 4 is the synoptic diagram that is used for the dynamic adjusting gear of discontinuous mode switch frequency values of LCD of the present invention.
Symbol description
11: controller
12: commutation circuit
13: fluorescent tube
40: the dynamic adjusting gear of discontinuous mode switch frequency values of the present invention
41: receiver
42: adjuster
43: forwarder
50: the signal source end
60: lamp tube controller
Embodiment
See also Fig. 3, it shows that the present invention is used for the process flow diagram of the discontinuous mode switch frequency values dynamic adjusting method of LCD.At first in step 31, this LCD receives the one scan frequency values that is transmitted by a signal source end, to carry out the scanning of screen-picture, this signal source end can be the setting of computer terminal display card or the software set of computer terminal, so this sweep frequency value and on-fixed, according to general dealer's setting, this sweep frequency value is generally 60Hz, 70.7Hz, 75.03Hz, 59.94Hz, 72.8Hz, 75Hz, 56.25Hz, 60.32Hz, 66.67Hz etc.
In step 32, according to this sweep frequency value, dynamically adjust the switching frequency value of a discontinuous mode.Dynamic adjusting method of the present invention can be utilized Calculation Method, according to this sweep frequency value, calculates the switching frequency of this discontinuous mode.This Calculation Method system is with this sweep frequency multiple with (N+0.5) on duty, and to calculate the switching frequency value of this discontinuous mode, wherein N is a natural number.And the permissible range of the switching frequency value of this discontinuous mode is ± 20Hz.
With embodiment explanation, if this sweep frequency value is 60Hz, and make N=3, then can calculate this switching frequency value is 210Hz (60 * 3.5), and this permissible range is ± 20Hz that still the best is ± 10Hz.Therefore, the optimum range of this switching frequency value is 210Hz ± 10Hz, that is the adjustable optimum range of this switching frequency value is between the 200Hz to 220Hz.
In addition, to can be this sweep frequency on duty with an integral multiple for the switching frequency of this discontinuous mode.The permissible range of the switching frequency of this discontinuous mode is ± 3Hz.
Again with another embodiment explanation, if this sweep frequency value is 75Hz, and make that this integral multiple is 3, then can calculate this switching frequency value is 225Hz (75 * 3), and this permissible range be ± 3Hz that still the best is ± 1Hz.Therefore, the optimum range of this switching frequency value is 225Hz ± 1Hz, that is the adjustable optimum range of this switching frequency value is between the 224Hz to 226Hz.
Dynamic adjusting method of the present invention be not limited to above-mentioned must be with Calculation Method, also can utilize a corresponding tables, store calculated this switching frequency value and pairing this sweep frequency value in advance, according to this sweep frequency value that receives, correspondence obtains the switching frequency value of this discontinuous mode.
In step 33, transmit this switching frequency to one lamp tube controller.This lamp tube controller transmits control waveform to fluorescent tube according to this switching frequency value, to light the brightness of fluorescent tube and control fluorescent tube.
Utilize the different sweep frequency value of method system's foundation of the present invention, the switching frequency value of dynamically adjusting bestly to improve known techniques, is fixed the shortcoming of this switching frequency value.Therefore, no matter the signal source end provides arbitrary sweep frequency value, this switching frequency value is dynamically adjusted thereupon, can eliminate or alleviate water ripple phenomenon, in order to do making human eye can not experience water ripple phenomenon.
With reference to figure 4, it shows the device 40 that the discontinuous mode switch frequency values that is used for LCD of the present invention is dynamically adjusted, and it comprises: a receiver 41, an adjuster 42 and a forwarder 43.This receiver 41 is in order to receive the one scan frequency values that is transmitted by a signal source end 50.This adjuster 42 this sweep frequency value in order to be received according to this receiver 41, dynamically adjust the switching frequency value of a discontinuous mode.This forwarder 43 is in order to transmit switching frequency value to a lamp tube controller 60 of this discontinuous mode.
This adjuster 42 comprises a frequency multiplier circuit in addition, in order to according to this sweep frequency multiple with (N+0.5) on duty, this sweep frequency is obtained the switching frequency of this discontinuous mode with process of frequency multiplication, and wherein N is a natural number.And the permissible range of the switching frequency value of this discontinuous mode is ± 20Hz.
This adjuster 42 also can utilize a frequency eliminating circuit, according to this a sweep frequency value and a high-frequency signal, makes the switching frequency value of this discontinuous mode (N+0.5) multiple for this sweep frequency value with this frequency eliminating circuit, and wherein N is a natural number.
In addition, this adjuster 42 can utilize above-mentioned frequency multiplier circuit or frequency eliminating circuit, makes the integral multiple of the switching frequency value of this discontinuous mode for this sweep frequency value.At this moment, the permissible range of the switching frequency value of this discontinuous mode is ± 3Hz.
Moreover this adjuster 42 can utilize a database, stores the corresponding tables data of this sweep frequency value and this discontinuous mode switch frequency values as calculated, and in order to do being beneficial to according to this sweep frequency value that receives, correspondence obtains the switching frequency value of this discontinuous mode.
Through after the dynamic adjustment of this adjuster 42, obtain this best switching frequency value, and with this forwarder 43 this lamp tube controller 60 with this switching frequency value transmission.60 of this lamp tube controller transmit control waveform to fluorescent tube according to this switching frequency value, to light the brightness of fluorescent tube and control fluorescent tube.Refer again to Fig. 1, this lamp tube controller 60 among Fig. 4 is identical with the controller 11 among Fig. 1, and it can separate with commutation circuit 12 or be combined into a module with this commutation circuit 12.
The foregoing description only is explanation principle of the present invention and effect thereof, and unrestricted the present invention.Therefore, those of ordinary skills can make amendment to the foregoing description without prejudice to spirit of the present invention and change.Interest field of the present invention should be listed as claims.
Claims (14)
1. the dynamic method of adjusting of discontinuous mode switch frequency values that is used for LCD is characterized in that, may further comprise the steps:
(a) receive the one scan frequency values that transmits by a signal source end;
(b) according to this sweep frequency value, adjust the switching frequency value of a discontinuous mode; And
(c) transmit switching frequency value to a lamp tube controller of this discontinuous mode.
2. the method for claim 1 is characterized in that: wherein be with Calculation Method in the step (b), according to this sweep frequency value, calculate the switching frequency value of this discontinuous mode.
3. method as claimed in claim 2 is characterized in that: wherein the switching frequency value of this discontinuous mode is this sweep frequency multiple with (N+0.5) on duty, and wherein N is a natural number.
4. method as claimed in claim 3 is characterized in that: wherein the permissible range of the switching frequency value of this discontinuous mode is ± 20Hz.
5. method as claimed in claim 2 is characterized in that: wherein the switching frequency value of this discontinuous mode is that this sweep frequency is on duty with an integral multiple.
6. method as claimed in claim 5 is characterized in that: wherein the permissible range of the switching frequency value of this discontinuous mode is ± 3Hz.
7. the method for claim 1 is characterized in that: wherein be that according to this sweep frequency value, correspondence obtains the switching frequency value of this discontinuous mode to look into the method for a corresponding tables in the step (b).
8. device that the discontinuous mode switch frequency values that is used for LCD is dynamically adjusted is characterized in that comprising:
One receiver is in order to receive the one scan frequency values that is transmitted by a signal source end;
One adjuster is electrically connected to this receiver, in order to according to this sweep frequency value, adjust the switching frequency value of a discontinuous mode; And
One forwarder is electrically connected to this adjuster, in order to transmit switching frequency value to a lamp tube controller of this discontinuous mode.
9. device as claimed in claim 8, it is characterized in that: wherein this adjuster comprises a frequency multiplier circuit in addition, in order to according to this sweep frequency multiple with (N+0.5) on duty, obtain the switching frequency value of this discontinuous mode with process of frequency multiplication, wherein N is a natural number.
10. device as claimed in claim 8, it is characterized in that: wherein this adjuster comprises a frequency eliminating circuit in addition, in order to according to this a sweep frequency value and a high-frequency signal, make the switching frequency value of this discontinuous mode (N+0.5) multiple for this sweep frequency value with this frequency eliminating circuit, wherein N is a natural number.
11. as claim 9 or 10 described devices, it is characterized in that: wherein the permissible range of the switching frequency value of this discontinuous mode is ± 20Hz.
12. as claim 9 or 10 described devices, it is characterized in that: wherein the switching frequency value of this discontinuous mode is that this sweep frequency is on duty with an integral multiple.
13. device as claimed in claim 12 is characterized in that: wherein the permissible range of the switching frequency value of this discontinuous mode is ± 3Hz.
14. method as claimed in claim 8 is characterized in that: wherein this adjuster comprises a database in addition, in order to store the corresponding tables data of this sweep frequency value and this discontinuous mode switch frequency values.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031049451A CN100358002C (en) | 2003-02-27 | 2003-02-27 | Apparatus and method for dynamically adjusting discontinuous modal switch frequency value of liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031049451A CN100358002C (en) | 2003-02-27 | 2003-02-27 | Apparatus and method for dynamically adjusting discontinuous modal switch frequency value of liquid crystal display |
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| Publication Number | Publication Date |
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| CN1525429A true CN1525429A (en) | 2004-09-01 |
| CN100358002C CN100358002C (en) | 2007-12-26 |
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| CNB031049451A Expired - Fee Related CN100358002C (en) | 2003-02-27 | 2003-02-27 | Apparatus and method for dynamically adjusting discontinuous modal switch frequency value of liquid crystal display |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437272C (en) * | 2004-10-14 | 2008-11-26 | 中强光电股份有限公司 | Method for driving device of generating plane light source, and structure |
| CN101325039B (en) * | 2007-06-11 | 2012-11-21 | 奇美电子股份有限公司 | Method for tracing and compensating human eyes and apparatus thereof |
| CN103218969A (en) * | 2013-03-12 | 2013-07-24 | 惠州雷曼光电科技有限公司 | Image displaying method, driving device and displaying system |
| WO2016107247A1 (en) * | 2014-12-31 | 2016-07-07 | 深圳Tcl新技术有限公司 | Liquid crystal display control method and liquid crystal display |
| WO2021238362A1 (en) * | 2020-05-26 | 2021-12-02 | 海信视像科技股份有限公司 | Display apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184117A (en) * | 1989-06-28 | 1993-02-02 | Zenith Data Systems Corporation | Fluorescent backlight flicker control in an LCD display |
| JPH095705A (en) * | 1995-06-22 | 1997-01-10 | Casio Comput Co Ltd | Back light driving method and inverter circuit in liquid crystal display device |
| EP0910229A3 (en) * | 1997-10-16 | 1999-08-25 | Tokin Corporation | Cold-cathode tube lighting circuit with protection circuit for piezoelectric transformer |
| CN1200327C (en) * | 2001-06-14 | 2005-05-04 | 英业达股份有限公司 | Multiple frequency type high voltage generator |
-
2003
- 2003-02-27 CN CNB031049451A patent/CN100358002C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437272C (en) * | 2004-10-14 | 2008-11-26 | 中强光电股份有限公司 | Method for driving device of generating plane light source, and structure |
| CN101325039B (en) * | 2007-06-11 | 2012-11-21 | 奇美电子股份有限公司 | Method for tracing and compensating human eyes and apparatus thereof |
| CN103218969A (en) * | 2013-03-12 | 2013-07-24 | 惠州雷曼光电科技有限公司 | Image displaying method, driving device and displaying system |
| WO2016107247A1 (en) * | 2014-12-31 | 2016-07-07 | 深圳Tcl新技术有限公司 | Liquid crystal display control method and liquid crystal display |
| CN105810159A (en) * | 2014-12-31 | 2016-07-27 | 深圳Tcl新技术有限公司 | Liquid crystal display control method and liquid crystal display |
| WO2021238362A1 (en) * | 2020-05-26 | 2021-12-02 | 海信视像科技股份有限公司 | Display apparatus |
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|---|---|
| CN100358002C (en) | 2007-12-26 |
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