CN1896815A - Current control device of liquid crystal display circulation device - Google Patents
Current control device of liquid crystal display circulation device Download PDFInfo
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- CN1896815A CN1896815A CNA2006101068331A CN200610106833A CN1896815A CN 1896815 A CN1896815 A CN 1896815A CN A2006101068331 A CNA2006101068331 A CN A2006101068331A CN 200610106833 A CN200610106833 A CN 200610106833A CN 1896815 A CN1896815 A CN 1896815A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/025—Reduction of instantaneous peaks of current
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a current control device of liquid crystal display circulation device comprising a microcomputer capable of recognising a input orthogonal frequency from PC and outputing a corresponding pulse width modulated signal due to different enactment of pulse width modulated frequency; a level shifting part for overturning/boosting duty ratio of the pulse width modulated signal from the microcomputer; An integrating circuit part for converting the overturned/boosted pulse width modulated signal into DC voltage and outputing the DC voltage to the circulation device to make the circulation device control current of a indicator light. This invention sets up PWM (Pulse-Width Modulation) frequency respectively based on input frequency of PC by adopting microcomputer and thereby improves water wave noises.
Description
One, technical field
The present invention relates to a kind of each vertical frequency PWM (Pulse WidthModulation) frequency is set respectively, can improve the circulator current control device of the LCD of ripples noise by input signal.
Two, background technology
With original display device CRT relatively, LCD has that power consumption is low especially, the high frequency of generation is also very low, and all very outstanding aspect volume and weight, the advantage that competitive power is high.Especially display device is tending towards maximizing gradually, and original CRT monitor can only be subjected to space constraint, and because of LCD can address this is that, it need increase gradually.
Directly adopt the product of liquid crystal display that notebook computer is arranged, PDA etc. are various to be carried with apparatus and desktop computer etc.
Moreover, notebook computer, various carrying with the most important meaning of apparatus such as PDA is to minimize power consumption.This is because carry this characteristics of carrying with apparatus, and causes battery utilization rate height, so in order to prolong above-mentioned battery service time as far as possible, can only reduce power consumption as far as possible.
Because of above-mentioned reason, carry the mode of all taking to change the LCD frame frequency with apparatus at present according to system-operating environment.That is, be the power consumption of reduction LCD, and change display frame frequency.
That is,, need change the LCD frame frequency according to system-operating environment along with carrying recently with the apparatus battery increase trend of service time.This is to change the LCD frame frequency in order to reduce the power consumption of system, to be confirmed to be arbitrarily after the environment that uses battery also is to use power environment.
At this moment, if adopt the fixedly digital mode circulator of PWM frequency, then, the frame frequency of said PWM frequency and LCD causes the bad problem of picture demonstration because of interfering according to the LCD brightness adjustment information.
Therefore, frame frequency with LCD when setting circulator PWM frequency usually is a reference settings, the said PWM frequency is made as than above-mentioned frame frequency, promptly the N than vertical synchronization frequency doubly is worth the value to 30Hz greater than 15Hz, if its difference is for below the 15Hz, then interfere the possibility height of LCD generation noise because of frequency.
Below, be with reference to the method for introducing the circulator Control current of LCD with the picture.
Figure 1 shows that the structural circuit of the circulator current control device of traditional LCD, Fig. 2 is the picture of the PWM frequency of traditional circulator, the ripples noise phenomenon synoptic diagram that the fixedly PWM frequency that Fig. 3 serves as reasons traditional produces.
With reference to figure 1, the circulator current control device of LCD comprises following assembly:
The microcomputer 100 of output and customer requirements control signal corresponding, the LCD module of show image signal (do not have among the figure and show), to above-mentioned LCD module supply light source and several pilot lamp (do not have among the figure and show) after being located at above-mentioned LCD module lower glass substrate, with width modulation (PWM) conversion of signals of above-mentioned microcomputer output is the integrating circuit portion 110 of DC voltage, according to the control signal of the output of above-mentioned integrating circuit portion 110 and above-mentioned microcomputer 100 circulator 120, change the 2nd capacitor C 2 of the DC voltage dutycycle of the fixed-frequency PWM that above-mentioned circulator 120 generates according to OSC to above-mentioned pilot lamp supply driving power.
Above-mentioned integrating circuit portion 110 is made up of the 1st resistance R 1 and the 1st capacitor C 1
After the PWM frequency content of circulator 120 and 100 outputs of above-mentioned microcomputer generated output voltage frequency synchronously, the luminophor of output LCD was adjusted brightness.In the said process, the PWM frequency content of circulator 120 and the frame frequency of LCD interact and interfere, so noise can appear in LCD picture.
That is, in the time that resolution can being changed,, then the dc voltage of above-mentioned integrating circuit portion 110 conversions is transferred to the control part of circulator 120 with the PWM output duty cycle (duty) of microcomputer 100 change output.Like this, above-mentioned control part receives the DC voltage dutycycle of voltage change according to the fixed-frequency PWM of OSC generation according to this, thereby makes pilot lamp open range operation, and the scope of closing stops, the wide more brighter display of the scope of opening, narrow more dark is more adjusted picture brightness thus.
In the circulator PWM control method, because of operating/stop pilot lamp with the opening/closing scope, so the electric current of backlight great changes will take place.At this moment, this electric current variation has influence on the pattern aspect by GND, and therefore ripple current takes place.
If this is because original LCD display adopts 5 layers of mask plate explained hereafter; then ACT layer direction established protection with data Layer; therefore can not be subjected to the influence of circulator ripple current; but change to 4 layers of mask plate technology; then the ripple current that takes place in the opening/closing scope of circulator will influence the ACT layer its generation image is leaked; therefore produce dicyclo between ACT side and Vcom terminal, its structure circulator ripple is loaded onto Vcom, produces the ripples line thus.
During circulator control brightness if with the PWM pattern, then the PWM frequency is to all PC signal vertical frequencys, get the value of ' A ' shown in Figure 2 without exception, problems such as ripples line shown in rabbit take place to the vertical frequency of PC input in this PWM frequency, and this phenomenon is especially serious when the PWM of circulator 120 frequency is the scope of half times of vertical frequency of PC signal.
Be difficult to the ripples line that all PC vertical frequencys such as 56/60/70/72/75Hz of importing produce is improved with single circulator PWM frequency, and therefore the PWM frequency that the oscillator of circulator generates can not be improved respectively the ripples line of each PC signal vertical frequency also with the variation of outside appurtenances temperature characterisitic.
As mentioned above, be the PWM frequency of adjusting LCD pilot lamp electric current to be set according to traditional approach according to the capability value that changes external capacitive.Therefore the capability value of external capacitive varies with temperature, and this moment, the PWM frequency also and then changed, and the variation of frequency causes changing the problem generation that brightness then produces LDC picture ripples line.
Three, summary of the invention
The object of the present invention is to provide a kind of opening/closing frequency of utilizing pwm signal to make the circulator pilot lamp all different, improve the circulator current control device of the LCD of ripples line thus.
Other purposes of the present invention form interlock for circulator PWM frequency that a kind of adjustment brightness that makes LCD is provided and the frame frequency of LCD, can change the circulator current control device of the LCD of adjusting brightness thus.
Another object of the present invention makes the circulator current control device of the LCD of its optimum frequency that is automatically converted to no frequency interference for a kind of circulator PWM frequency of controlling the adjustment brightness of LCD is provided.
The objective of the invention is to be achieved through the following technical solutions:
A kind of circulator current control device from the LCD of drive current to the LCD pilot lamp that supply, it is characterized in that: width modulation (PWM) frequency setting that it comprises because of each vertical frequency is all different, can be from the vertical frequency of PC identification input, output and the above-mentioned microcomputer that is identified the vertical frequency relevant pulse width modulation signals;
Dutycycle (PWM duty) to the pulse-width signal of above-mentioned microcomputer output overturns/the level moving part of amplification;
After the pulse width modulated signal conversion of above-mentioned level moving part upset/amplification is DC voltage, the DC voltage after the above-mentioned conversion is outputed to above-mentioned circulator, make the integrating circuit portion of its control pilot lamp electric current.
In parallel with above-mentioned integrating circuit portion, control becomes the voltage distribution resistance of user's required voltage by the voltage of above-mentioned integrating circuit portion; Connect with above-mentioned integrating circuit portion, in parallel with above-mentioned voltage distribution with resistance, to carry out the Current Control resistance of Current Control with the voltage of resistance by above-mentioned voltage distribution; Connect between above-mentioned Current Control is with resistance and above-mentioned circulator, to carrying out the control of electric current adverse current by above-mentioned Current Control with the voltage of resistance, the transmission relevant voltage is to the diode of above-mentioned circulator.
Above-mentioned level moving part is connected the 1st resistance between above-mentioned transistor and the above-mentioned microcomputer by transistor, and the 2nd resistance that is connected between above-mentioned transistor and the power supply (Vcc) is formed.
The above-mentioned width modulation of setting respectively by vertical frequency (PWM) frequency is to avoid half times of point of corresponding vertical frequency, the remote setpoint frequency of trying one's best.
Behind the above-mentioned circulator identification high signal, then be activated and light above-mentioned pilot lamp, according to the brightness of adjusting above-mentioned pilot lamp by the DC voltage of diode input.
The invention has the beneficial effects as follows: can set the PWM frequency respectively by the PC incoming frequency with microcomputer, therefore can provide the LCD circulator that improves ripples line current control device.
Four, description of drawings
Figure 1 shows that the structural circuit of the circulator current control device of traditional LCD;
Fig. 2 is the picture of the PWM frequency of traditional circulator;
The ripples noise phenomenon synoptic diagram that the fixedly PWM frequency that Fig. 3 serves as reasons traditional produces;
Fig. 4 is the simple knot composition of the circulator current control device of LCD of the present invention;
The PWM frequency plot that Fig. 5 distributes by vertical frequency for the present invention;
Main mark explanation in the accompanying drawing
100,410: microcomputer 110,430: integrating circuit portion
120,440:400:PC 420: the level moving part
Five, embodiment
Below, introduce the present invention in conjunction with the accompanying drawings in detail with preferred example.
Fig. 4 is the simple knot composition of the circulator current control device of LCD of the present invention, the PWM frequency plot that Fig. 5 distributes by vertical frequency for the present invention.
With reference to figure 4, the circulator current control device of LCD comprises following assembly:
Because of setting width modulation (PWM) frequency respectively by each vertical frequency, can be from the vertical frequency of PC400 identification input, output and above-mentioned microcomputer 410 Hes that are identified the corresponding width modulation of vertical frequency (PWM) signal, the LCD module of show image signal (do not have among the figure and show), to above-mentioned LCD module supply light source and several pilot lamp (do not have among the figure and show) after being located at above-mentioned LCD module lower glass substrate, dutycycle (PWM duty) to width modulation (PWM) signal of above-mentioned microcomputer 410 outputs overturns/the level moving part 420 of amplification, with width modulation (PWM) conversion of signals of above-mentioned level moving part upset/amplification is the integrating circuit portion 430 of DC voltage, in parallel with above-mentioned integrating circuit portion 430, control becomes the voltage distribution resistance R4 of user's required voltage by the voltage of above-mentioned integrating circuit portion, in parallel with above-mentioned voltage distribution with resistance R4, to carry out the Current Control resistance R5 of Current Control with the voltage of resistance R4 by above-mentioned voltage distribution, in above-mentioned Current Control resistance R5 and 440 series connection of above-mentioned circulator, to carrying out the control of electric current adverse current with the voltage of resistance (R5) by above-mentioned Current Control, the transmission relevant voltage is to the diode D1 of above-mentioned circulator 440, supply circulator 440, the 2 capacitor C 2 of driving power to above-mentioned pilot lamp according to the control signal of above-mentioned diode D1 output.
Wherein, above-mentioned level moving part is connected the 1st resistance R 1 between above-mentioned transistor Q1 and the above-mentioned microcomputer 410 by transistor Q1, and the 2nd resistance R 2 that is connected between above-mentioned transistor Q1 and the power Vcc is formed.
As shown in Figure 5, set width modulation (PWM) frequency respectively by each vertical frequency in the above-mentioned microcomputer 410.When therefore using PWM, should suitably change the frequency of ' A ' shown in Figure 2 and avoid taking place the ripples line according to frequency by above-mentioned mobile PWM frequency input.
For improving water ripple phenomenon, for avoiding half times of point of frequency input signal, the remote as far as possible PWM frequency of setting is set the optimum frequency that the ripples line does not take place according to the vertical frequency of PC signal and is solved ripples line problem.
And the corresponding PWM frequency of vertical frequency is exported and be identified to above-mentioned microcomputer 410 identifications from the vertical frequency of PC400 input signal.
For example, if the vertical frequency of the PC signal of input is 56Hz, then above-mentioned microcomputer 410 outputs and the corresponding PWM frequency of 56Hz 238Hz.
Above-mentioned microcomputer 410 can utilize the corresponding PWM output signal of perpendicular frequency by identification from PC signal vertical frequency, sets the frequency of LCD module pilot lamp electric current on/off respectively by each vertical frequency, improves the ripples line thus.
Above-mentioned level moving part and 420 is to width modulation (PWM) signal of the above-mentioned microcomputer 410 outputs above-mentioned integrating circuit portion 430 of overturning/output to after the amplification.Be above-mentioned level moving part 420, when the signal as if above-mentioned microcomputer 410 outputs was ' high ' signal, overturning was ' low ' signal, when being ' low ' signal, overturns to exporting behind ' high ' signal.
Above-mentioned integrating circuit portion 430 is a DC voltage with width modulation (PWM) conversion of signals of above-mentioned level moving part upset/amplification, makes it be converted to the required voltage V0 of user by above-mentioned voltage distribution with resistance (R4).Above-mentioned voltage V0 is the voltage by the normal identification of control part of above-mentioned circulator 440, can change the triangular wave frequency of decision PWM frequency by the 2nd capacitor C 2 ends identification free voltage, avoids the frequency that the ripples line takes place.
Control through the electric current of above-mentioned voltage distribution, by being transferred to circulator 440 after the above-mentioned diode D1 Control current adverse current with resistance R5 according to above-mentioned Current Control with the voltage of resistance R4.
Promptly be connected on carrying out between the Current Control usefulness resistance R5 and above-mentioned circulator 440 of Current Control through the voltage of above-mentioned voltage distribution with resistance R4, transmit relevant voltage to above-mentioned circulator 440 to carrying out Current Control through above-mentioned Current Control with the voltage of resistance (R5), 440 bases of above-mentioned circulator are supplied driving power by the control signal that above-mentioned diode D1 exports to above-mentioned pilot lamp.
Above-mentioned circulator 440 identification ' high ' signals then are activated and light pilot lamp built-in in the LCD module, according to the brightness of adjusting pilot lamp by the voltage of above-mentioned diode D1 input.
Because of the present invention is not the method that has adopted according to outside circulator the 2nd Current Control frequency, but use, so the PWM frequency can be exported highly stable frequency with the external condition variation according to distributing crystal to export.
That is, microcomputer 410 identification PC signal vertical frequencys are utilized the corresponding PWM output signal of the above-mentioned vertical frequency that is identified, and set frequency with each resolution opening/closing respectively by each vertical frequency, improve the ripples line thus.
Notebook computer, PDA etc. carry the mode that apparatus takes can change according to system-operating environment the LCD frame frequency.That is, in order to reduce the power consumption of LCD, when adjusting the LCD frame frequency, the circulator PWM frequency of adjusting the brightness of LCD pilot lamp also with its interlock change.
By the content of above explanation, those skilled in the art can carry out various change and modification in the scope that does not depart from the technology of the present invention thought.Therefore, technical scope of the present invention is not limited to the content of putting down in writing among the embodiment, and must be determined by claims.
Claims (5)
1, a kind of circulator current control device of LCD, it is characterized in that: it comprises sets all different because of the pulse width modulation frequency of each vertical frequency, can be from the vertical frequency of PC identification input, output and the above-mentioned microcomputer that is identified the vertical frequency relevant pulse width modulation signals;
Dutycycle to the pulse-width signal of above-mentioned microcomputer output overturns/the level moving part of amplification;
After the pulse width modulated signal conversion of above-mentioned level moving part upset/amplification is DC voltage, the DC voltage after the above-mentioned conversion is outputed to above-mentioned circulator, make the integrating circuit portion of its control pilot lamp electric current.
2, the circulator current control device of LCD according to claim 1, it is characterized in that: above-mentioned level moving part is by transistor, be connected the 1st resistance between above-mentioned transistor and the above-mentioned microcomputer, be connected the 2nd resistor group between above-mentioned transistor and the power supply.
3, the circulator current control device of LCD according to claim 1 is characterized in that it also comprises:
In parallel with above-mentioned integrating circuit portion, control becomes the voltage distribution resistance of user's required voltage by the voltage of above-mentioned integrating circuit portion;
Connect with above-mentioned integrating circuit portion, in parallel with above-mentioned voltage distribution with resistance, to carry out the Current Control resistance of Current Control with the voltage of resistance by above-mentioned voltage distribution;
Connect between above-mentioned Current Control is with resistance and above-mentioned circulator, to carrying out the control of electric current adverse current by above-mentioned Current Control with the voltage of resistance, the transmission relevant voltage is to the diode of above-mentioned circulator.
4, the circulator current control device of LCD according to claim 1 is characterized in that: the above-mentioned pulse width modulation frequency of setting respectively by vertical frequency is half times of point avoiding corresponding vertical frequency, the remote setpoint frequency of trying one's best.
5, the circulator current control device of LCD according to claim 1, it is characterized in that: behind the above-mentioned circulator identification high signal, then be activated and light above-mentioned pilot lamp, according to the brightness of adjusting above-mentioned pilot lamp by the DC voltage of diode input.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2005-0081022 | 2005-08-31 | ||
| KR1020050081022 | 2005-08-31 | ||
| KR1020050081022A KR100854840B1 (en) | 2005-08-31 | 2005-08-31 | Apparatus for controlling inverter current of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1896815A true CN1896815A (en) | 2007-01-17 |
| CN100434981C CN100434981C (en) | 2008-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101068331A Expired - Fee Related CN100434981C (en) | 2005-08-31 | 2006-07-31 | Current control device of liquid crystal display circulation device |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100854840B1 (en) |
| CN (1) | CN100434981C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646400A (en) * | 2011-08-15 | 2012-08-22 | 北京京东方光电科技有限公司 | Display driving circuit, driving method and liquid crystal display device |
| CN103093727A (en) * | 2013-01-23 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Backlight control signal adjustment method and backlight control signal adjustment device |
| CN108446008A (en) * | 2018-02-27 | 2018-08-24 | 晶晨半导体(上海)股份有限公司 | A kind of dynamic response adjusting method of classification frequency modulation and voltage modulation |
| WO2021238362A1 (en) * | 2020-05-26 | 2021-12-02 | 海信视像科技股份有限公司 | Display apparatus |
| CN114677978A (en) * | 2022-04-01 | 2022-06-28 | 北京芯格诺微电子有限公司 | LED backlight driving method for brightness abnormity caused by frame synchronization signal switching |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100020326A (en) | 2008-08-12 | 2010-02-22 | 삼성전자주식회사 | Method of driving light-source, light-source apparatus performing for the method and display apparatus having the light-source apparatus |
| KR102258239B1 (en) | 2013-11-12 | 2021-06-02 | 삼성디스플레이 주식회사 | Backlight unit and display device comprising the backlight unit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002008881A (en) * | 2000-06-28 | 2002-01-11 | Osram-Melco Ltd | Sealed luminaire and luminaire |
| KR100382158B1 (en) * | 2000-10-20 | 2003-05-01 | 주식회사 지엘디 | The driving circuit of the plasma discharge type flat backlight |
| KR100857848B1 (en) * | 2002-05-17 | 2008-09-10 | 삼성전자주식회사 | Back light assembly, method for driving the same, and liquid crystal display having the same |
| KR100864499B1 (en) * | 2002-07-22 | 2008-10-20 | 삼성전자주식회사 | Liquid crystal display and backlight driving apparatus thereof |
| KR100943715B1 (en) * | 2003-04-21 | 2010-02-23 | 삼성전자주식회사 | Power Supply, Liquid Crystal Display Device And Driving Method For The Same |
-
2005
- 2005-08-31 KR KR1020050081022A patent/KR100854840B1/en not_active IP Right Cessation
-
2006
- 2006-07-31 CN CNB2006101068331A patent/CN100434981C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646400A (en) * | 2011-08-15 | 2012-08-22 | 北京京东方光电科技有限公司 | Display driving circuit, driving method and liquid crystal display device |
| CN102646400B (en) * | 2011-08-15 | 2013-12-18 | 北京京东方光电科技有限公司 | Display driving circuit, driving method and liquid crystal display device |
| CN103093727A (en) * | 2013-01-23 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Backlight control signal adjustment method and backlight control signal adjustment device |
| CN103093727B (en) * | 2013-01-23 | 2015-11-18 | 深圳创维－Rgb电子有限公司 | Backlight control signal method of adjustment and device |
| CN108446008A (en) * | 2018-02-27 | 2018-08-24 | 晶晨半导体(上海)股份有限公司 | A kind of dynamic response adjusting method of classification frequency modulation and voltage modulation |
| WO2021238362A1 (en) * | 2020-05-26 | 2021-12-02 | 海信视像科技股份有限公司 | Display apparatus |
| CN114677978A (en) * | 2022-04-01 | 2022-06-28 | 北京芯格诺微电子有限公司 | LED backlight driving method for brightness abnormity caused by frame synchronization signal switching |
| CN114677978B (en) * | 2022-04-01 | 2022-09-20 | 北京芯格诺微电子有限公司 | LED backlight driving method for brightness abnormity caused by frame synchronization signal switching |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100854840B1 (en) | 2008-08-27 |
| KR20070025176A (en) | 2007-03-08 |
| CN100434981C (en) | 2008-11-19 |
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