CN101770751A - System and method for regulating brightness of backlight module of liquid crystal display - Google Patents
System and method for regulating brightness of backlight module of liquid crystal display Download PDFInfo
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- CN101770751A CN101770751A CN200810247032A CN200810247032A CN101770751A CN 101770751 A CN101770751 A CN 101770751A CN 200810247032 A CN200810247032 A CN 200810247032A CN 200810247032 A CN200810247032 A CN 200810247032A CN 101770751 A CN101770751 A CN 101770751A
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Abstract
The invention discloses a system and a method for regulating the brightness of a backlight module of a liquid crystal display. The system comprises a DC power supply used for providing a DC current, a backlight drive circuit used for driving the backlight module, a signal generating module used for generating a brightness control signal, a signal amplifying module used for amplifying the brightness control signal and outputting the amplified brightness control signal, and a switch module, wherein the switch module is connected between the DC power supply and the backlight drive circuit, is connected with the signal amplifying module and is used for connecting and disconnecting the DC power supply and the backlight drive circuit according to the amplified brightness control signal. The brightness of the backlight module is regulated by connecting and disconnecting the DC power supply and the backlight drive circuit and general components with relatively low cost are used, so the system and the method of the invention have the advantages of low cost, simple control and the like, and effectively reduce the power consumption of the backlight module.
Description
Technical field
The present invention relates to a kind of brightness control system and method for LCD, especially relate to a kind of module brightness control system backlight and method.
Background technology
LCD is a kind of non-self-emission display apparatus, and therefore module backlight need be set provides light-emitting component, according to the position difference of light-emitting component in the module backlight, can be divided into side-light type module backlight and down straight aphototropism mode set.Module backlight adopts cold-cathode fluorescence lamp (CCFL) or light emitting diode (LED) array as light-emitting component usually.No matter be that CCFL or LED are all current driving element, its brightness is directly proportional with average current.
LCD is very high to the luminosity requirement of module backlight, but high brightness also makes LCD power consumption high, and module backlight is the accessory that takes electricity in the LCD most.No matter existing LCD backlight module in any case, is all keeping a kind of high brightness state, and this is the big main reason of module power consumption backlight.Therefore according to the brightness of the different adjustment module backlight of operating position, can reduce the power consumption of display device, reduce the human eye fatigue strength.
At present, the prior art brightness controlling device utilizes the chip with scalable function to realize the brightness regulation of module backlight usually, and cost height, control complexity are unfavorable for marketing.
Summary of the invention
The purpose of this invention is to provide a kind of LCD backlight module brightness control system and method, not only have advantages such as cost is low, control is simple, and can effectively reduce the power consumption of module backlight.
For achieving the above object, the invention provides a kind of LCD backlight module brightness control system, comprise the direct supply that is used to provide DC current, be used to drive the backlight drive circuit of described module backlight, be used to generate the signal generation module of brightness control signal, be used for to described brightness control signal carry out that amplification is handled and output amplification after the signal amplification module and the switch module of brightness control signal, described switch module is connected between direct supply and the backlight drive circuit, and be connected with described signal amplification module, be used for controlling conducting or disconnection between described direct supply and the backlight drive circuit according to the brightness control signal after the described amplification.
For achieving the above object, the present invention also provides a kind of LCD backlight module brightness adjusting method, and it comprises:
Generate a brightness control signal;
Described brightness control signal is carried out amplification handle, the brightness control signal after the acquisition amplification;
Control conducting or disconnection between direct supply and the backlight drive circuit according to the brightness control signal after the described amplification.
The invention provides a kind of LCD backlight module brightness control system and method, regulate the brightness of module backlight by conducting between control direct supply and the backlight drive circuit or disconnection, and utilize lower-cost universal elements, efficiently solve technological deficiencies such as prior art brightness controlling device cost height, control complexity, have advantages such as cost is low, control is simple.In addition, because the present invention directly regulates the direct supply of input,, make module backlight have advantages such as low in energy consumption so the quiescent dissipation of module backlight is farthest reduced.
Description of drawings
Fig. 1 is the structural representation of LCD backlight module brightness control system of the present invention;
Fig. 2 is the process flow diagram of LCD backlight module brightness adjusting method of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 1 is the structural representation of LCD backlight module brightness control system of the present invention.As shown in Figure 1, LCD backlight module brightness control system of the present invention, be used for regulating the brightness of the light-emitting component (not shown) of module backlight, comprise direct supply 1, backlight drive circuit 2, switch module 3, signal amplification module 4 and signal generation module 5.Direct supply 1 provides the energy of certain power by switch module 3 to backlight drive circuit 2, and stably driven light-emitting element is luminous to make backlight drive circuit 2.Backlight drive circuit 2 is electrically connected with light-emitting component in the module backlight, is used for driven light-emitting element, and light-emitting component can be a light-emitting component commonly used in the LCD backlight modules such as cold-cathode fluorescence lamp or light emitting diode (LED) array.Switch module 3 is connected between backlight drive module 2 and the direct supply 1, and switch module 3 is connected with signal amplification module 4, and signal amplification module 4 is connected with signal generation module 5, and signal generation module 5 is connected with the control knob (not shown) of LCD.Signal generation module 5 is used to generate brightness control signal, and brightness control signal is the square wave that certain amplitude and frequency are arranged, and its dutycycle can be 0--100%, for example pulse-length modulation (Puls Width Modulation; Be called for short PWM) signal.Signal amplification module 4 is used for the amplitude of the brightness control signal that will receive from signal generation module 5 and amplifies, and exports to the brightness control signal after switch module 3 amplification.In the practical application, the signal generation module can adopt chip microcontroller, and the user clicks the adjusting button of LCD, can generate the brightness control signal with dutycycle corresponding with the brightness of required module backlight by control single chip computer.Because the signal that single-chip microcomputer generates is not enough to the conducting or the disconnection of driving switch module 3 usually, handle so need increase signal amplification module 4 that the brightness control signal that generates is carried out amplification.In the practical application, can adopt operational amplifier to realize the function of signal amplification module 4.After switch module 3 obtains brightness control signal after the amplification, disconnect or conducting i.e. conducting or disconnect between direct supply 1 and the backlight drive circuit 2 according to the dutycycle of signal.Can adopt the Darlington switching tube to realize the function of switch module 3 in the practical application, the amplifying power that so can overcome single operational amplifier is limited, problems such as impedance matching.
Among the present invention, the brightness control signal that has default dutycycle by generation, and can the required magnitude of voltage of gauge tap folding to satisfying in the switch module with its amplification, realized by the duty conducting of gauge tap module recently of brightness control signal or the function of disconnection.Because people's vision is not only relevant with the brightness power to the impression of brightness, also relevant with fluorescent lifetime, thereby utilizes human eye " persistence of vision " effect, the lighting of conversion luminophor, shut-in time will form a kind of visual brightness and change.This brightness variation is directly proportional with the dutycycle of signal.For example, with 80% dutycycle (be in the one-period 4/5 cycle open, 1/5 cycle closed) pwm signal gauge tap module, can produce 80% visual experience of maximum brightness to human eye, be equal to and reduced by 20% brightness, also therefore reduced by 20% power consumption.When LCD needs standby maybe to need to show black picture, be 0% brightness control signal by regulating button, generating dutycycle, then be equal to power cutoff, save energy consumption to the full extent.When LCD in the very bright local time of light, make picture clear in order to improve contrast, can be by regulating button, generate dutycycle and be 100% brightness control signal, with the brightness furnishing maximum of light-emitting component.
LCD backlight module brightness control system of the present invention, regulate the brightness of module backlight by conducting between control direct supply and the backlight drive circuit or disconnection, and utilize lower-cost universal elements, need not to be provided with elements such as brightness regulation chip, efficiently solve technological deficiencies such as prior art brightness controlling device cost height, control complexity, have advantages such as cost is low, control is simple.In addition, because the present invention directly regulates the direct supply of input,, make module backlight have advantages such as low in energy consumption so the quiescent dissipation of module backlight is farthest reduced.
Fig. 2 is the process flow diagram of LCD backlight module brightness adjusting method of the present invention.As shown in Figure 2, module brightness adjusting method backlight of the present invention comprises:
Generate a brightness control signal;
Described brightness control signal is carried out amplification handle, the brightness control signal after the acquisition amplification;
According to conducting or disconnection between control direct supply of the brightness control signal after the described amplification and the backlight drive circuit.
LCD backlight module brightness adjusting method of the present invention, specific as follows:
At first, generate a brightness control signal by the signal generation module, brightness control signal is the square wave that certain amplitude and frequency are arranged, its dutycycle can be 0--100%, specifically be by the needs of user according to oneself, adjusting button on the manual adjustments panel of LCD, by with regulate single-chip microcomputer that button connects and generate the brightness control signal that has with the corresponding dutycycle of the brightness of required module backlight;
Then, receive brightness control signal, and it is carried out amplification handle by the signal amplification module, the brightness control signal after the acquisition amplification, the degree that amplification is handled can the gauge tap module be advisable with signal, need not to carry out particular determination;
At last, the dutycycle of the brightness control signal of switch module after according to amplification is carried out conducting or disconnection, and during conducting, direct current power supply is in backlight drive circuit, and driven light-emitting element is luminous, otherwise during disconnection.
LCD backlight module brightness adjusting method of the present invention, regulate the brightness of module backlight by conducting between control direct supply and the backlight drive circuit or disconnection, efficiently solve technological deficiencies such as prior art brightness controlling device control complexity, have and control advantages such as simple.In addition, because the present invention directly regulates the direct supply of input,, make module backlight have advantages such as low in energy consumption so the quiescent dissipation of module backlight is farthest reduced.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (6)
1. LCD backlight module brightness control system is characterized in that comprising:
Direct supply is used to provide DC current;
Backlight drive circuit is connected with module backlight, is used to drive described module backlight;
The signal generation module is used to generate brightness control signal;
The signal amplification module is connected with described signal generation module, and be used for that described brightness control signal is carried out amplification and handle, and the brightness control signal after the output amplification;
Switch module is connected between direct supply and the backlight drive circuit, and is connected with described signal amplification module, is used for controlling conducting or disconnection between described direct supply and the backlight drive circuit according to the brightness control signal after the described amplification.
2. LCD backlight module brightness control system according to claim 1 is characterized in that described brightness control signal is a pwm signal, and its dutycycle is 0-100%.
3. LCD backlight module brightness control system according to claim 1 is characterized in that described signal generation module is connected with the adjusting button of LCD.
4. LCD backlight module brightness adjusting method is characterized in that comprising:
Generate a brightness control signal;
Described brightness control signal is carried out amplification handle, the brightness control signal after the acquisition amplification;
Control conducting or disconnection between direct supply and the backlight drive circuit according to the brightness control signal after the described amplification.
5. LCD backlight module brightness adjusting method according to claim 4 is characterized in that described brightness control signal is a pwm signal, and its dutycycle is 0-100%.
6. LCD backlight module brightness adjusting method according to claim 4 is characterized in that the step of described generation brightness control signal is specially, and the adjusting button that the user controls LCD generates brightness control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810247032A CN101770751A (en) | 2008-12-30 | 2008-12-30 | System and method for regulating brightness of backlight module of liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810247032A CN101770751A (en) | 2008-12-30 | 2008-12-30 | System and method for regulating brightness of backlight module of liquid crystal display |
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| CN101770751A true CN101770751A (en) | 2010-07-07 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984658A (en) * | 2010-11-05 | 2011-03-09 | 华为终端有限公司 | Standby method of electrical appliance and electrical appliance |
| CN103310740A (en) * | 2013-04-26 | 2013-09-18 | 明基电通有限公司 | Image processing method for display device and display device |
| CN105118437A (en) * | 2015-09-21 | 2015-12-02 | 京东方科技集团股份有限公司 | Display drive method and device, and display device |
| CN105590588A (en) * | 2015-12-21 | 2016-05-18 | 武汉华星光电技术有限公司 | Backlight adjusting method, liquid crystal display device, and electronic device |
| CN106332421A (en) * | 2016-09-05 | 2017-01-11 | 深圳市科陆电子科技股份有限公司 | Method and system for controlling electric energy meter backlight |
| CN106782298A (en) * | 2017-01-18 | 2017-05-31 | 深圳市金研微科技有限公司 | A kind of brightness adjusting method of LED display screen system |
-
2008
- 2008-12-30 CN CN200810247032A patent/CN101770751A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984658A (en) * | 2010-11-05 | 2011-03-09 | 华为终端有限公司 | Standby method of electrical appliance and electrical appliance |
| CN103310740A (en) * | 2013-04-26 | 2013-09-18 | 明基电通有限公司 | Image processing method for display device and display device |
| CN103310740B (en) * | 2013-04-26 | 2015-11-18 | 明基电通有限公司 | The image treatment method of display device and display device thereof |
| CN105118437A (en) * | 2015-09-21 | 2015-12-02 | 京东方科技集团股份有限公司 | Display drive method and device, and display device |
| US10269299B2 (en) | 2015-09-21 | 2019-04-23 | Boe Technology Group Co., Ltd. | Display device and method for obtaining a data voltage to be output to rows of pixel circuits |
| CN105590588A (en) * | 2015-12-21 | 2016-05-18 | 武汉华星光电技术有限公司 | Backlight adjusting method, liquid crystal display device, and electronic device |
| WO2017107265A1 (en) * | 2015-12-21 | 2017-06-29 | 武汉华星光电技术有限公司 | Backlight adjusting method, liquid crystal display apparatus, and electronic device |
| CN105590588B (en) * | 2015-12-21 | 2018-06-29 | 武汉华星光电技术有限公司 | Backlight adjusting method, liquid crystal display device and electronic equipment |
| US10115353B2 (en) | 2015-12-21 | 2018-10-30 | Wuhan China Star Optoelectronics Technology Co., Ltd | Backlight adjustment method, liquid crystal display device and electronic apparatus |
| CN106332421A (en) * | 2016-09-05 | 2017-01-11 | 深圳市科陆电子科技股份有限公司 | Method and system for controlling electric energy meter backlight |
| CN106782298A (en) * | 2017-01-18 | 2017-05-31 | 深圳市金研微科技有限公司 | A kind of brightness adjusting method of LED display screen system |
| WO2018133182A1 (en) * | 2017-01-18 | 2018-07-26 | 深圳市金研微科技有限公司 | Luminance adjusting method for led display screen system |
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Application publication date: 20100707 |