CN102543011A - Liquid crystal backlight drive system with adjustable brightness - Google Patents
Liquid crystal backlight drive system with adjustable brightness Download PDFInfo
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- CN102543011A CN102543011A CN2010106235125A CN201010623512A CN102543011A CN 102543011 A CN102543011 A CN 102543011A CN 2010106235125 A CN2010106235125 A CN 2010106235125A CN 201010623512 A CN201010623512 A CN 201010623512A CN 102543011 A CN102543011 A CN 102543011A
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Abstract
The invention provides a liquid crystal backlight drive system with adjustable brightness. The liquid crystal backlight drive system with adjustable brightness comprises a constant-current drive integrated circuit, a liquid crystal backlight source and a comparator, and is characterized by further comprising a temperature sensor located in the liquid crystal backlight source and used for detecting working environment temperature of the liquid crystal backlight source, wherein the temperature sensor is used for acquiring an electric signal of the working environment temperature, the comparator is used for comparing the electric signal with a temperature threshold and generating pulse width modulation signals with different duty ratios to be input into an enable signal end of a switch of the-constant current drive integrated circuit according to a comparison result so as to control the output of the constant-current drive integrated circuit; when the brightness of the liquid crystal backlight source is changed, a heat value is changed, and the working environment temperature is changed therewith; and when the temperature sensor detects the ambient temperature variation, the output electric signal is also changed therewith, so that the constant-current drive integrated circuit regulates the drive current to adjust the brightness of the liquid crystal backlight.
Description
Technical field
The present invention relates to lcd technology, more specifically, the present invention relates to a kind of lyo-luminescence diode (the Light Emitting Diode) backlight driving system that can regulate brightness according to environment temperature automatically.
Background technology
Because the multiple flat display apparatus such as thin-film transistor LCD device and super-twist nematic liquid crystal indicator has gently, approaches and the advantage of power saving, making them be widely used in PDA(Personal Digital Assistant), cell phone (Cell Phone), GPS (GPS), portable electronic device (PMP), handheld device (HGC) and portable optic disk player etc. needs in the multiple portable equipment of Presentation Function.
Thin film transistor liquid crystal display device and super-twist nematic liquid crystal indicator do not possess the autoluminescence performance; Need to adopt module backlight (Back Light); At present main flow module light emitting source backlight mainly contains two kinds of cold cathode fluorescent tube (Cold Cathode Fluorescent Lamp) and light emitting diodes (Light Emitting Diode); LED backlight module contrast cold cathode fluorescent tube has more power saving; More frivolous, characteristics such as more environmental protection and colour gamut be wideer, liquid crystal indicator that portable display device adopts all uses the LED backlight module basically.
The structure of the liquid crystal indicator that portable display device adopted comprises LED backlight module (LED back light module) and two parts of liquid crystal panel (LCD panel); Module wherein backlight partly comprises light emitting source; LGP and optical thin film material, and liquid crystal panel comprises panel and two parts of drive integrated circult.With the light emitting diode is the light emitting source of the portable liquid crystal device of light emitting source; The placement configurations of panel and drive integrated circult is as shown in Figure 1 basically; The LED optical strip of being made up of many light emitting diodes 114 series and parallels 111 places orlop; Liquid crystal panel 112 is close on the LED optical strip 111, and liquid crystal panel drive integrated circult 113 pressings (Bonding) are on liquid crystal panel.
Advantages such as light emitting diode has high brightness, and WV is low, and is low in energy consumption; So on the portable liquid crystal device, obtained widely using, but simultaneously light emitting diode also to have thermal value bigger, be difficult for characteristics such as heat radiation; Cause the liquid crystal indicator operating ambient temperature too high; And higher working temperature environment can cause shorten the serviceable life of liquid crystal panel drive integrated circult, liquid crystal panel display frame deleterious.
Summary of the invention
For overcoming the too high defective of liquid crystal indicator operating ambient temperature in the prior art, the present invention proposes a kind of LCD backlight drive system.
According to the present invention, a kind of intensity adjustable LCD backlight drive system has been proposed, comprising: constant-current driving integrated circuit, liquid crystal backlight, comparer and AND circuit; It is characterized in that, also comprise being positioned at liquid crystal backlight temperature inside sensor, be used to detect the operating ambient temperature of liquid crystal backlight; Wherein, Temperature sensor obtains the electric signal of the said operating ambient temperature of expression; Said comparer is done comparison with this electric signal and temperature threshold; According to said comparative result, the pulse-width signal that produces different duty is input to the switch enable signal end of constant-current driving integrated circuit, the output of control constant-current driving integrated circuit; When the brightness of liquid crystal backlight changes; Thermal value changes, and its operating ambient temperature changes thereupon, when temperature sensor detects variation of ambient temperature; The electric signal of output also can change thereupon, makes the constant-current driving integrated circuit regulate the brightness that drive current is regulated liquid crystal backlight.
Compared to prior art; This LCD backlight drive system is integrated temperature sensor on this backlight of LCD, and this temperature sensor is the working temperature in inductive backlight source automatically, and passes to analog to digital converter to information; After handling, pass to microcontroller through comparer; Microcontroller produces certain dutycycle pulse-width signal automatically according to the temperature signal that passes over, with outside pulse-width signal through AND circuit with after, the generation enable signal is input to the constant-current driving integrated circuit; With the automatic adjusting of realization constant-current driving integrated circuit output electric current, thus the automatic adjusting of realization liquid crystal display device backlight lightness.
Description of drawings
Fig. 1 illustrates the placement configurations of the drive integrated circult of prior art;
Fig. 2 illustrates the structural representation according to LCD backlight drive system of the present invention;
Fig. 3 illustrates gate circuit input of the present invention and the relation of exporting signal;
Fig. 4 illustrates the output of electric current and the relation of luminous diode temperature.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment a kind of LCD backlight drive system provided by the invention is described in detail.
In first embodiment, the present invention provides a kind of LCD backlight drive system, comprises the constant-current driving integrated circuit, liquid crystal backlight and comparer.Temperature sensor is positioned at backlight center of liquid crystal backlight.Wherein, temperature sensor is used to detect the operating ambient temperature of liquid crystal backlight, and transmits electric signal to comparer.Comparer is done comparison to this signal, produces the pulse-width signal of certain dutycycle, and is input to the switch enable signal end of constant-current driving integrated circuit, the output of control constant-current driving integrated circuit.The switch enable signal input part of constant-current driving integrated circuit receives the pulse-width signal of this certain dutycycle; When switch enable signal input part input signal is high level; The work of constant-current driving integrated circuit, output power is when switch enable signal input part input signal is low level; The constant-current driving integrated circuit is not worked, and stops output power.
Further, this constant-current driving integrated circuit comprises five pins, comprises the power supply input pin, integrated circuit switch enable, output pin, current feedback pin and grounding pin.Can be with reference to the wherein output of integrated circuit switch enable 212 connection gate circuits 260 of figure 2; When the output of gate circuit 260 be integrated circuit switch enable 212 be input as low level the time; Integrated circuit quits work, and output is closed, when the integrated circuit switch enable is input as high level; The integrated circuit operate as normal, the output steady current.Output pin 213 is connected to liquid crystal backlight 220, is used to drive liquid crystal backlight 220.Current feedback pin 214 is connected to the output terminal of liquid crystal backlight, according to the output current of liquid crystal backlight 220, confirms feedback current to constant-current driving integrated circuit 210, to guarantee constant-current driving.
This comparer receives the signal of expression environment temperature, and compares with the internal temperature signal of setting, and produces the pulse-width signal of certain dutycycle, is input to AND circuit.When temperature signal is big, produce dutycycle than before little pulse-width signal, when temperature signal hour, produce dutycycle than before big pulse-width signal.
In service specifically, when liquid crystal backlight brightness was higher, the thermal value of light emitting diode was also bigger; Its operating ambient temperature rises, and when temperature sensor detected the environment temperature rising, the electric signal of output also can change thereupon; If the temperature sensor of positive temperature coefficient (PTC) is big; Then high more its two ends electric potential difference of temperature is big more, if the temperature sensor of negative temperature coefficient, then high more its two ends electric potential difference of temperature is more little.Temperature sensor with positive temperature coefficient (PTC) is an example; When temperature sensor detects environment temperature when higher; Export a bigger electric signal and be input to comparer, comparer is done the relatively pulse-width signal of the corresponding dutycycle of back generation to input signal, is input to the switch enable pin of crossing current drive integrated circult; The output of control constant-current driving integrated circuit, thereby the automatic adjusting of realization liquid crystal display device backlight lightness.
Fig. 2 illustrates LCD backlight drive system 200 according to a second embodiment of the present invention, and is as shown in Figure 2, and LCD backlight drive system 200 comprises constant-current driving integrated circuit 210; Liquid crystal backlight 220; Analog to digital converter 230, comparer 240, microcontroller 250 and AND circuit 260.Temperature sensor 222 is positioned at backlight center of liquid crystal backlight 220.Wherein, temperature sensor is used to detect the operating ambient temperature of liquid crystal backlight 222, and transmits electric signal and give analog to digital converter 230.Analog to digital converter 230 is transformed into digital signal to temperature sensor 222 electrical signal delivered, and outputs to comparer 240.240 pairs of digital signals of comparer are done comparison, produce a signal, and output to microcontroller 250.Microcontroller 250 produces the pulse-width signal of certain dutycycle after receiving the output signal of comparer 240, and is input to AND circuit 260.AND circuit 260 is done the pulse-width signal of microcontroller 250 outputs mutually and computing with the switch enable signal of outside input, and is input to the switch enable signal end of constant-current driving integrated circuit 210, the output of control constant-current driving integrated circuit.The switch enable signal input part of constant-current driving integrated circuit 210 receives the pulse-width signal of certain dutycycle; When switch enable signal input part input signal is high level; The work of constant-current driving integrated circuit, output power is when switch enable signal input part input signal is low level; The constant-current driving integrated circuit is not worked, and stops output power.
Further, as shown in Figure 2, this constant-current driving integrated circuit 210 comprises five pins, comprises power supply input pin 211, integrated circuit switch enable 212, output pin 213, current feedback pin 214 and grounding pin 215.Wherein integrated circuit switch enable 212 connects the output of gate circuit 260; When the output of gate circuit 260 be integrated circuit switch enable 212 be input as low level the time; Integrated circuit quits work, and output is closed, when the integrated circuit switch enable is input as high level; The integrated circuit operate as normal, the output steady current.Output pin 213 is connected to liquid crystal backlight 220, is used to drive liquid crystal backlight 220.Current feedback pin 214 is connected to the output terminal of liquid crystal backlight, according to the output current of liquid crystal backlight 220, confirms feedback current to constant-current driving integrated circuit 210, to guarantee constant-current driving.
This liquid crystal backlight 220 comprises that some light emitting diodes 221 are welded on the parallel-connection structure that printed circuit board (PCB) (Printed Circuit Board) is gone up the light-emitting section of forming (Light Bar) through series system (structure of connecting shown in the figure); A plurality of such led lighting bars also connect together, and form backlight.222 positions that are integrated in the light-emitting section middle of temperature sensor, the working temperature of detecting liquid crystal backlight 220, and produce the electric signal that is used to represent this temperature according to the temperature that detects.Be appreciated that in the centre position of light-emitting section and arrange that single temperature sensor 222 is used to save the layout quantity of temperature sensor; In order to measure more accurately; Can be at a plurality of location arrangements temperature sensors 222; Be used to obtain the temperature of a plurality of positions, and the perhaps temperature value of ad-hoc location of averaging.
This analog to digital converter 230 is transformed into digital signal to the analog electrical signal that temperature sensor 222 passes over, and passes to comparer 240.
This comparer 240 receives the digital signal that analog to digital converter 230 passes over, and compares with the internal temperature signal of setting, and exports to microcontroller 250 to comparative result.
260 pairs of microcontrollers of AND circuit 250 output signals and outside width modulation input 270 do with computing after; Produce the switch enable input end 212 that new pulse-width signal is input to constant-current driving integrated circuit 210; The work of control constant-current driving integrated circuit, thereby the duty of regulating liquid crystal backlight 220.
In service specifically, when liquid crystal backlight 220 brightness were higher, the thermal value of light emitting diode 221 was also bigger; Its operating ambient temperature rises, and when temperature sensor 221 detected the environment temperature rising, the electric signal of output also can change thereupon; If the temperature sensor of positive temperature coefficient (PTC) is big; Then high more its two ends electric potential difference of temperature is big more, if the temperature sensor of negative temperature coefficient, then high more its two ends electric potential difference of temperature is more little.Temperature sensor with positive temperature coefficient (PTC) is an example; When temperature sensor 221 detects environment temperature when higher; Export a bigger electric signal and be input to analog to digital converter 230, analog to digital converter 230 becomes specific digital signal to electrical signal conversion, and is input to comparer 240; 240 pairs of input signals of comparer are done relatively, and generation one signal in back sends microcontroller 250 to; Microcontroller 250 produces the pulse-width signal of corresponding dutycycle according to input signal, with the pulse-width signal 270 of outside input through AND circuits 260 do with computing after, produce the switch enable pin that new pulse-width signal is input to the drive integrated circult 210 that flows over; The output of control constant-current driving integrated circuit, thereby the automatic adjusting of realization liquid crystal display device backlight lightness.
See also Fig. 3; The AND circuit input involved in the present invention and the relation of output signal; Outside width modulation input signal 31 is 65% pulse-width signal for dutycycle; The pulse-width signal 32 that microcontroller produces is 50% pulse-width signal for dutycycle; Through AND circuit 212 do with computing after the pulse-width signal 33 that produces be 50% pulse-width signal for dutycycle, after this signal is input to the switch enable pin of constant-current driving integrated circuit 210, the output current of constant-current driving integrated circuit will reduce (65%-50%)/65%=23.08%.The output of electric current and the relation of luminous diode temperature see also Fig. 4, and as can be seen from Figure 4 electric current is big more, and temperature is high more, and electric current reduces, and temperature also decreases.
What should explain at last is that above embodiment is only in order to describe technical scheme of the present invention rather than the present technique method is limited.
Claims (6)
1. an intensity adjustable LCD backlight drive system comprises: constant-current driving integrated circuit, liquid crystal backlight and comparer; It is characterized in that, also comprise being positioned at liquid crystal backlight temperature inside sensor, be used to detect the operating ambient temperature of liquid crystal backlight;
Wherein, Temperature sensor obtains the electric signal of the said operating ambient temperature of expression; Said comparer is done comparison with this electric signal and temperature threshold; According to comparative result, the pulse-width signal that produces different duty is input to the switch enable signal end of constant-current driving integrated circuit, the output of control constant-current driving integrated circuit; When the brightness of liquid crystal backlight changes; Thermal value changes, and its operating ambient temperature changes thereupon, when temperature sensor detects variation of ambient temperature; The electric signal of output also can change thereupon, makes the constant-current driving integrated circuit regulate the brightness that drive current is regulated liquid crystal backlight.
2. LCD backlight drive system according to claim 1 is characterized in that said temperature sensor is integrated in the position of light-emitting section middle, the working temperature of detecting liquid crystal backlight; The perhaps a plurality of temperature sensors of a plurality of location arrangements of light-emitting section.
3. LCD backlight drive system according to claim 1; It is characterized in that comparer produces dutycycle ratio little pulse-width signal before when the Current Temperatures signal is big; When temperature signal hour, produce dutycycle than before big pulse-width signal.
4. LCD backlight drive system according to claim 1; It is characterized in that the switch enable signal input part of said constant-current driving integrated circuit receives pulse-width signal, when switch enable signal input part input signal is high level; The work of constant-current driving integrated circuit, output power; When switch enable signal input part input signal was low level, the constant-current driving integrated circuit was not worked, and stops output power.
5. LCD backlight drive system according to claim 4 is characterized in that, said constant-current driving integrated circuit also comprises output pin and current feedback pin; Output pin is connected to liquid crystal backlight, is used to drive liquid crystal backlight; The current feedback pin is connected to the output terminal of liquid crystal backlight, according to the output current of liquid crystal backlight, confirms feedback current to the constant-current driving integrated circuit, to guarantee constant-current driving.
6. LCD backlight drive system according to claim 1 is characterized in that, this liquid crystal backlight comprises the parallel-connection structure of the light-emitting section that some light emitting diodes are welded to form through series system.
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| CN2010106235125A CN102543011A (en) | 2010-12-29 | 2010-12-29 | Liquid crystal backlight drive system with adjustable brightness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106235125A CN102543011A (en) | 2010-12-29 | 2010-12-29 | Liquid crystal backlight drive system with adjustable brightness |
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| CN102543011A true CN102543011A (en) | 2012-07-04 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102968961A (en) * | 2012-11-15 | 2013-03-13 | 京东方科技集团股份有限公司 | Control method, backlight control circuit, liquid crystal display (LCD) panel and LCD |
| CN105741716A (en) * | 2014-12-12 | 2016-07-06 | 环旭电子股份有限公司 | Display device and backlight intensity adjustment method thereof |
| CN106128370A (en) * | 2016-08-31 | 2016-11-16 | 上海伟世通汽车电子系统有限公司 | The temperature protective device of vehicle-mounted TFT panel type display and method |
| CN106855792A (en) * | 2015-12-09 | 2017-06-16 | 小米科技有限责任公司 | A kind of terminal with display function |
| CN107610676A (en) * | 2017-09-27 | 2018-01-19 | 上海展扬通信技术有限公司 | The screen brightness control method and screen intensity control system of a kind of intelligent terminal |
| CN107818764A (en) * | 2017-10-26 | 2018-03-20 | 惠科股份有限公司 | Display system and current driving method |
| CN110933344A (en) * | 2019-12-17 | 2020-03-27 | 深圳市视景达科技有限公司 | Television mainboard backlight adjusting method and circuit and television equipment |
| CN112233627A (en) * | 2020-12-14 | 2021-01-15 | 北京显芯科技有限公司 | Control method of backlight circuit, backlight circuit and LCD display screen |
| CN113851088A (en) * | 2021-08-18 | 2021-12-28 | 惠州市德赛西威汽车电子股份有限公司 | Automobile instrument self-adaptive backlight control system and method |
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| CN110933344A (en) * | 2019-12-17 | 2020-03-27 | 深圳市视景达科技有限公司 | Television mainboard backlight adjusting method and circuit and television equipment |
| CN112233627A (en) * | 2020-12-14 | 2021-01-15 | 北京显芯科技有限公司 | Control method of backlight circuit, backlight circuit and LCD display screen |
| CN113851088A (en) * | 2021-08-18 | 2021-12-28 | 惠州市德赛西威汽车电子股份有限公司 | Automobile instrument self-adaptive backlight control system and method |
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Application publication date: 20120704 |