CN101312001A - Back light device and its brightness control circuit control method - Google Patents
Back light device and its brightness control circuit control method Download PDFInfo
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- CN101312001A CN101312001A CNA2007101040788A CN200710104078A CN101312001A CN 101312001 A CN101312001 A CN 101312001A CN A2007101040788 A CNA2007101040788 A CN A2007101040788A CN 200710104078 A CN200710104078 A CN 200710104078A CN 101312001 A CN101312001 A CN 101312001A
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Abstract
The invention discloses an intensity circuit, which comprises a detecting unit, a control unit and a current regulating unit, wherein, the detecting unit is used for detecting the working current size of each luminescence module and producing a plurality of detecting signals to the control unit; the control unit can produce a plurality of control signals according to the detecting signals and deliver the control signals to the current regulating unit; the current regulating unit can adjust the working current size of each luminescence module.
Description
Technical field
The invention relates to a kind of back lighting device and intednsity circuit thereof, and particularly relevant for the control method of a kind of back lighting device and intednsity circuit thereof.
Background technology
Because characteristics such as light emitting diode (light emitting diode) has that volume is little, power saving and long service life make light emitting diode be widely used in various information equipments such as mobile phone, camera and LCD.
With LCD, light emitting diode can be used as its backlight.When LCD, needs to use a large amount of light emitting diodes during as backlight with light emitting diode, make the brightness of display frame can meet user's requirement.In addition, because LCD has been used a large amount of light emitting diodes, make the drive current rising of light emitting diode and the number of driving circuit thereof increase.Therefore, in the design of back light source in LED, a plurality of light emitting modules can be coupled in parallel, and each light emitting module comprises a plurality of light emitting diodes again.By this, the number of the driving circuit of the size of the drive current of reduction light emitting diode and minimizing light emitting diode.
Yet light emitting diode is in manufacture process, and its cross-pressure can be subjected to temperature, crystal property or light emitting diode and produce factor affecting such as short circuit, makes each light emitting diode can produce different cross-pressures.Therefore, when the design of traditional back light source in LED, each light emitting module is to be formed by the series connection of a plurality of light emitting diodes, makes the cross-pressure error amount of each light emitting diode to add up, and causes the total cross-pressure value of light emitting diode of each light emitting module can be not identical.So that under input steady job voltage condition, each light emitting module can be because of total cross-pressure value difference of its light emitting diode, and make and working current difference to some extent cause the luminosity of each light emitting module inequality, cause the uneven phenomenon of brightness of display frame to produce.
Summary of the invention
Therefore, purpose of the present invention is providing a kind of back lighting device and intednsity circuit thereof exactly, adjusts the working current size of each light emitting module by current adjustment unit.
Another object of the present invention provides a kind of brightness control method, in order to the brightness of a plurality of light emitting modules of synchro control, makes that the brightness of each light emitting module is all identical.
The present invention proposes a kind of intednsity circuit, and it is suitable for the brightness of a plurality of light emitting modules of synchro control.Intednsity circuit comprises detecting unit, control module and current adjustment unit.Wherein, detecting unit is in order to detecting the working current size of each light emitting module, and produces a plurality of detection signals and be sent to control module, and control module also can produce a plurality of control signals according to a plurality of detection signals.In addition, current adjustment unit is disposed between a plurality of light emitting modules and the detecting unit, and adjusts the size of current of corresponding light emitting module according to the control signal of control module generation.
The present invention proposes a kind of back lighting device, comprises a plurality of light emitting modules, detecting unit, control module and current adjustment unit.Wherein, detecting unit is in order to detecting the working current size of each light emitting module, and produces corresponding detection signal.And control module is coupled to detecting unit, in order to receive detection signal and to produce a plurality of control signals.In addition, current adjustment unit is disposed between a plurality of light emitting modules and the detecting unit, and adjusts the size of current of corresponding light emitting module according to control signal.
The present invention proposes a kind of brightness control method, is suitable for the brightness of a plurality of light emitting modules of synchro control.Brightness control method provided by the present invention comprises and detects the working current of each light emitting module of flowing through, and produces a plurality of detection signals.In addition, produce a plurality of control signals, and adjust the size of the working current of each those light emitting module according to each control signal synchronously according to these detection signals.
Back lighting device provided by the invention and intednsity circuit thereof can be adjusted to identical size with the working current of each light emitting module by brightness control method, make each light emitting module produce the light emitting module of same brightness.Therefore, the brightness of every bit is all identical in the display frame.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 illustrates and is a kind of back lighting device according to a preferred embodiment of the present invention.
Fig. 2 illustrates and is a kind of control module according to a preferred embodiment of the present invention.
Fig. 3 illustrates and is a kind of brightness control method according to a preferred embodiment of the present invention.
Fig. 4 illustrates to according to the adjusted working current of brightness control method of the present invention.
Fig. 5 illustrates and is a kind of brightness control method according to another embodiment of the present invention.
Fig. 6 illustrates to according to the adjusted working current of another embodiment brightness control method.
Embodiment
Fig. 1 illustrates and is a kind of back lighting device according to a preferred embodiment of the present invention.Please refer to Fig. 1, back lighting device 100 comprises power supply unit 103, intednsity circuit 105 and a plurality of light emitting module (101a～101n).Wherein, power supply unit 103 provides each light emitting module (required power supply during the operation of 101a～101n), intednsity circuit 105 then is applicable to (the brightness of 101a～101n) of a plurality of light emitting modules of synchro control.
Intednsity circuit 105 comprises detecting unit 115, control module 118 and current adjustment unit 110.Wherein, detecting unit 115 also comprises a plurality of resistance (115a～115n), and be coupled to corresponding light emitting module (101a～101n) respectively, in order to detect each light emitting module (working current of 101a～101n) (size of Ia～In), and produce a plurality of detection signals and be sent to control module 118.In addition, current adjustment unit 110 is disposed at light emitting module (101a～101n) and between the detecting unit 115, in order to receiving the control signal that control module 118 produces, and adjust each light emitting module (working current of 101a～101n) (size of Ia～In) according to corresponding control signal.
Fig. 2 illustrates and is a kind of control module according to a preferred embodiment of the present invention, can be used for realizing the control module 118 of Fig. 1.Control module 118 comprises error amplifier module 210, current compensation module 212 and pulse-width modulator 215.Wherein, error amplifier module 210 is coupled to detecting unit 115, the detection signal that produces in order to comparison reference voltage signal and detecting unit 115, and produce a plurality of comparison signals and be sent to current compensation module 212.
At this moment, current compensation module 212 can produce a plurality of compensating control signals according to these comparison signals, and these compensating control signals are sent to pulse-width modulator 215.Pulse-width modulator 215 then can produce a plurality of control signals and export current adjustment unit 110 to according to these compensating control signals, adjusts each light emitting module (working current of 101a～101n) (size of Ia～In) by current adjustment unit 110.
Please merge and see figures.1.and.2, current module 101a also is coupled to switch 111a and by resistance 115a ground connection except being coupled to power supply unit 103.When power supply unit 103 provides a fixed voltage source when light emitting module 101a and switch 111a are conducting, then can produce a working current Ia flow through light emitting module 101a, switch 111a and resistance 115a.In addition, present embodiment can be according to user's demand a plurality of light emitting modules in parallel (101a～101n), and each light emitting module (101a～101n) all is coupled to corresponding switch (111a～111n) and resistance (115a～115n).Similarly, ((111a～when 111n) being conducting then can produce corresponding working current (Ia～In) for 101a～101n) and switch to these light emitting modules when power supply unit 103 provides a fixed voltage source.
In addition, (101a～101n) also comprises a plurality of light emitting diodes to light emitting module, and the cathode terminal of each light emitting diode all is coupled to the anode tap of next light emitting diode.Wherein, each light emitting diode can produce factor affecting such as short circuit because of temperature, crystal property or light emitting diode, and produces different cross-pressures.Therefore, (total cross-pressure size of the light emitting diode of 101a～101n) added up can be not identical, causes each light emitting module (working current of 101a～101n) (Ia～In) yet can be not identical for each light emitting module.
When working current (Ia～In) flow through resistance (during 115a～115n), can be respectively (115a～115n) produces voltage signal, and these voltage signals are sent to error amplifier module 210 at the resistance of correspondence.It should be noted that present embodiment can (115a～115n) will flow through, and ((Ia～In) be converted to the signal of voltage kenel to the working current of 101a～101n) to light emitting module by resistance.
In addition, see also Fig. 2, error amplifier module 210 also comprises a plurality of error amplifiers.And these error amplifiers also can receive reference voltage signal except receiving corresponding voltage signal, and produce corresponding comparison signal and be sent to current compensation module 212.By this, current compensation module 212 can produce a plurality of compensating control signals and be sent to pulse-width modulator 215 according to these comparison signals.
Pulse-width modulator 215 also can produce a plurality of control signals and be sent to current adjustment unit 110 according to these compensating control signals.(whether conducting of 111a～111n), ((Ia～In) makes that (101a～101n) produces identical brightness to each light emitting module to the working current size of 101a～101n) to switch by Control current adjustment unit 110 to adjust each light emitting module.Therefore, the brightness of any point all can be identical in the display frame.
Fig. 3 illustrates to a kind of brightness control method according to a preferred embodiment of the present invention, is applicable to the brightness of a plurality of light emitting modules of synchro control.Please refer to Fig. 3, brightness control method of the present invention comprises the working current size S301 that detects each light emitting module of flowing through, and the detection signal of electric current kenel is converted to the detection signal S305 of voltage kenel.In addition, can produce a plurality of control signals according to these detection signals.
Then, each voltage detection signal is compared S307 with reference voltage respectively, and produce a plurality of comparison signals.Brightness control method of the present invention can under the situation of fixing corresponding control signal frequency, be adjusted responsibility cycle (duty cycle) S310 of each control signal respectively according to each comparison signal.
When these voltage detection signals one of them during greater than reference voltage, then can reduce the responsibility cycle of corresponding control signal, to reduce the working current size S313 of corresponding light emitting module.Otherwise, when these detection signals one of them during less than reference voltage, then can increase the responsibility cycle of corresponding control signal, to increase the working current size S313 of corresponding light emitting module.By this, the working current of each light emitting module is adjusted to identical size, makes that the every bit in the display frame has identical brightness.
Fig. 4 illustrates to according to the adjusted working current of brightness control method of the present invention.Please refer to Fig. 4, comprise working current I1 and the I2 and the reference current Iref of two light emitting modules of flowing through among Fig. 4, its responsibility cycle is respectively T1, T2 and Tref.Because the size of the electric current that voltage detection signal is corresponding with it is a proportional relation, and working current I1＞working current I2＞reference current Iref, so voltage detection signal maximum that working current I1 produces, the voltage detection signal that working current I2 produces takes second place, and the voltage detection signal minimum that reference current Iref produces.In addition, brightness control method of the present invention during greater than reference voltage, then will reduce the responsibility cycle of corresponding control signal at voltage detection signal, to reduce the working current size of corresponding light emitting module.Therefore, when voltage detection signal is big more, then its responsibility cycle is more little, makes the responsibility cycle Tref maximum of reference current Iref, and the responsibility cycle T2 of working current I2 takes second place, the responsibility cycle T1 minimum of working current I1.
Fig. 5 illustrates to a kind of brightness control method according to another embodiment of the present invention, is applicable to the brightness of a plurality of light emitting modules of synchro control.Please refer to Fig. 5, brightness control method of the present invention comprises the working current size S501 that detects each light emitting module of flowing through, and the detection signal of electric current kenel is converted to the detection signal S505 of voltage kenel.In addition, can produce a plurality of control signals according to these detection signals.
Then, each voltage detection signal is compared S507 with reference voltage respectively, and produce a plurality of comparison signals.Brightness control method of the present invention can under the situation of fixing corresponding control signal responsibility cycle, be adjusted the frequency of each control signal respectively according to each comparison signal.
When these voltage detection signals one of them during greater than reference voltage, then can reduce the frequency S510 of corresponding control signal, to reduce the working current size S513 of corresponding light emitting module.Otherwise, when these detection signals one of them during less than reference voltage, then can increase the frequency S510 of corresponding control signal, to increase the working current size S513 of corresponding light emitting module.By this, the working current of each light emitting module is adjusted to identical size, makes that the every bit in the display frame has identical brightness.
Fig. 6 illustrates to according to the adjusted working current of the brightness control method of another embodiment.Please refer to Fig. 6, comprise working current I1 and the I2 and the reference current Iref of two light emitting modules of flowing through among Fig. 6.Wherein, working current I1 has identical responsibility cycle with working current I2.Because the size of the electric current that voltage detection signal is corresponding with it is a proportional relation, and working current I1＞working current I2＞reference current Iref, so voltage detection signal maximum that working current I1 produces, the voltage detection signal that working current I2 produces takes second place, the voltage detection signal minimum that reference current Iref produces.In addition, another brightness control method of the present invention during greater than reference voltage, then can reduce the frequency of corresponding control signal at voltage detection signal, to reduce the working current size of corresponding light emitting module.Therefore, when voltage detection signal is big more, then the frequency of its control signal is more little, makes that in the time of Ta～Tb, the frequency that working current I2 is produced can be greater than working current I1.
In sum, back lighting device of the present invention comprises power supply unit, intednsity circuit and a plurality of light emitting module.Wherein, intednsity circuit is applicable to the brightness of a plurality of light emitting modules of synchro control, and provides each light emitting module identical working current, makes that the brightness of any point all can be identical in the display frame.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (21)
1. intednsity circuit be suitable for the brightness of a plurality of light emitting modules of synchro control, and this intednsity circuit comprises:
One detecting unit in order to detecting the working current size of each those light emitting module, and produces a plurality of detection signals;
One control module couples this detecting unit, in order to produce a plurality of control signals according to those detection signals; And
One current adjustment unit is disposed between those light emitting modules and this detecting unit, and adjusts the size of current of each those light emitting module according to those control signals.
2. intednsity circuit as claimed in claim 1 is characterized in that this detecting unit comprises a plurality of resistance, couples those light emitting modules respectively, and the detection signal that converts the voltage kenel in order to the working current with each those light emitting module to is given this control module.
3. intednsity circuit as claimed in claim 1, it is characterized in that, each those light emitting module comprises a plurality of light emitting diodes, and the cathode terminal of each light emitting diode all is coupled to the anode tap of next light emitting diode, and the cathode terminal of last light emitting diode then sees through resistance eutral grounding corresponding in this detecting unit.
4. intednsity circuit as claimed in claim 1 is characterized in that, this control module comprises:
One error amplifier module couples this detecting unit, in order to those detection signals and a reference voltage signal are compared, and produces a plurality of comparison signals;
One current compensation module couples this error amplifier module, in order to produce a plurality of compensating control signals according to those comparison signals; And
One pulse-width modulator couples this current compensation module, gives this current adjustment unit in order to produce those control signals according to those comparison signals.
5. intednsity circuit as claimed in claim 4 is characterized in that, this error amplifier module comprises a plurality of error amplifiers, receives those detection signals and this reference voltage signal respectively, and the comparison signal of output correspondence respectively.
6. intednsity circuit as claimed in claim 1, it is characterized in that, this current adjustment unit comprises a plurality of switches, is disposed at respectively between those light emitting modules and this detecting unit, and then one of them decides the conducting situation to each those switch according to those control signals.
7. back lighting device comprises:
A plurality of light emitting modules;
One detecting unit in order to detecting the working current size of each those light emitting module, and produces a plurality of detection signals;
One control module couples this detecting unit, in order to produce a plurality of control signals according to those detection signals; And
One current adjustment unit is disposed between those light emitting modules and this detecting unit, and adjusts the size of current of each those light emitting module according to those control signals.
8. back lighting device as claimed in claim 7 is characterized in that this detecting unit comprises a plurality of resistance, couples those light emitting modules respectively, and the detection signal that converts the voltage kenel in order to the working current of each those light emitting module of will flowing through to is given this control module.
9. back lighting device as claimed in claim 8, it is characterized in that, each those light emitting module comprises a plurality of light emitting diodes, and the cathode terminal of each light emitting diode all is coupled to the anode tap of next light emitting diode, and the cathode terminal of last light emitting diode then sees through resistance eutral grounding corresponding in this detecting unit.
10. back lighting device as claimed in claim 7 is characterized in that, this control module comprises:
One error amplifier module couples this detecting unit, in order to those detection signals and a reference voltage signal are compared, and produces a plurality of comparison signals;
One current compensation module couples this error amplifier module, in order to produce a plurality of compensating control signals according to those comparison signals; And
One pulse-width modulator couples this current compensation module, gives this current adjustment unit in order to produce those control signals according to those compensating control signals.
11. back lighting device as claimed in claim 10 is characterized in that, this error amplifier module comprises a plurality of error amplifiers, receives those detection signals and this reference voltage signal respectively, and the comparison signal of output correspondence respectively.
12. back lighting device as claimed in claim 7, it is characterized in that, this current adjustment unit comprises a plurality of switches, is disposed at respectively between those light emitting modules and this detecting unit, and then one of them decides the conducting situation to each those switch according to those control signals.
13. back lighting device as claimed in claim 7 is characterized in that, also comprises a power supply unit, in order to provide each light emitting module operation required power supply.
14. a brightness control method be suitable for the brightness of a plurality of light emitting modules of synchro control, and this brightness control method comprises:
The detection working current of each those light emitting module of flowing through, and produce a plurality of detection signals; And
Produce a plurality of control signals according to those detection signals, and adjust the size of the working current of each those light emitting module according to each control signal synchronously.
15. brightness control method as claimed in claim 14 is characterized in that, comprises that also with the flow through working current of each those light emitting module of conversion be the detection signal of voltage kenel.
16. brightness control method as claimed in claim 14 is characterized in that, utilizes this control signal to adjust the step of the working current of each those light emitting module, comprises the following steps:
Each those detection signal and a reference voltage signal are compared, and produce a plurality of comparison signals; And
According to those comparison signals, and fixing under the frequency of those control signals, adjusting the responsibility cycle of each those control signal respectively, controlling the size of the working current of each light emitting module with correspondence.
17. brightness control method as claimed in claim 16, it is characterized in that, adjust the step of the working current of each those light emitting module, also comprise when those detection signals one of them during greater than this reference voltage, then reduce the responsibility cycle of corresponding control signal, to reduce the working current size of corresponding light emitting module.
18. brightness control method as claimed in claim 16, it is characterized in that, adjust the step of the working current of each those light emitting module, also comprise when those detection signals one of them during less than this reference voltage, then increase the responsibility cycle of corresponding control signal, to increase the working current size of corresponding light emitting module.
19. brightness control method as claimed in claim 14 is characterized in that, utilizes this control signal to adjust the step of the working current of each those light emitting module, comprises the following steps:
Each those detection signal and a reference voltage signal are compared, and produce a plurality of comparison signals; And
According to those comparison signals, and fixing under the responsibility cycle of those control signals, adjusting the frequency of each those control signal respectively, controlling the size of the working current of each light emitting module with correspondence.
20. brightness control method as claimed in claim 19, it is characterized in that, adjust the step of the working current of each those light emitting module, also comprise when those detection signals one of them during greater than this reference voltage, then reduce the frequency of corresponding control signal, to reduce the working current size of corresponding light emitting module.
21. brightness control method as claimed in claim 19, it is characterized in that, adjust the step of the working current of each those light emitting module, also comprise when those detection signals one of them during less than this reference voltage, then increase the frequency of corresponding control signal, to increase the working current size of corresponding light emitting module.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101040788A CN101312001A (en) | 2007-05-22 | 2007-05-22 | Back light device and its brightness control circuit control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101040788A CN101312001A (en) | 2007-05-22 | 2007-05-22 | Back light device and its brightness control circuit control method |
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| CNA2007101040788A Pending CN101312001A (en) | 2007-05-22 | 2007-05-22 | Back light device and its brightness control circuit control method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848574A (en) * | 2009-03-27 | 2010-09-29 | 北京京东方光电科技有限公司 | Drive device of light emitting diode backlight source and brightness adjustment method |
| CN101539249B (en) * | 2009-04-02 | 2011-03-02 | 深圳华映显示科技有限公司 | Light source system with single power supply |
| CN102110418A (en) * | 2009-12-28 | 2011-06-29 | 乐金显示有限公司 | Backlight unit, method for driving the same, and liquid crystal display device using the same |
| US8427081B2 (en) | 2009-09-16 | 2013-04-23 | Novatek Microelectronics Corp. | Driving apparatus of light emitting diode and driving method thereof |
| CN104105273A (en) * | 2013-04-02 | 2014-10-15 | 黄国洪 | Method for detecting light emitting diode driving circuit |
| CN104159365A (en) * | 2014-07-22 | 2014-11-19 | 合肥鑫晟光电科技有限公司 | Backlight circuit and backlight with same |
| CN102779484B (en) * | 2009-05-21 | 2014-12-10 | 华映视讯（吴江）有限公司 | Control method for backlight module control system |
| WO2015096111A1 (en) * | 2013-12-23 | 2015-07-02 | 深圳市华星光电技术有限公司 | Liquid crystal display and method for adjusting brightness and contrast of liquid crystal display |
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2007
- 2007-05-22 CN CNA2007101040788A patent/CN101312001A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848574A (en) * | 2009-03-27 | 2010-09-29 | 北京京东方光电科技有限公司 | Drive device of light emitting diode backlight source and brightness adjustment method |
| US8319454B2 (en) | 2009-03-27 | 2012-11-27 | Beijing Boe Optoelectronics Technology Co., Ltd. | Driving device, backlight with the driving device and driving method of backlight |
| CN101539249B (en) * | 2009-04-02 | 2011-03-02 | 深圳华映显示科技有限公司 | Light source system with single power supply |
| CN102779484B (en) * | 2009-05-21 | 2014-12-10 | 华映视讯（吴江）有限公司 | Control method for backlight module control system |
| US8427081B2 (en) | 2009-09-16 | 2013-04-23 | Novatek Microelectronics Corp. | Driving apparatus of light emitting diode and driving method thereof |
| USRE46330E1 (en) | 2009-09-16 | 2017-02-28 | Novatek Microelectronics Corp. | Driving apparatus of light emitting diode and driving method thereof |
| CN102110418A (en) * | 2009-12-28 | 2011-06-29 | 乐金显示有限公司 | Backlight unit, method for driving the same, and liquid crystal display device using the same |
| US9336724B2 (en) | 2009-12-28 | 2016-05-10 | Lg Display Co., Ltd. | Backlight unit, method for driving the same, and liquid crystal display device using the same |
| CN104105273B (en) * | 2013-04-02 | 2016-03-30 | 黄国洪 | Method for detecting light emitting diode driving circuit |
| CN104105273A (en) * | 2013-04-02 | 2014-10-15 | 黄国洪 | Method for detecting light emitting diode driving circuit |
| WO2015096111A1 (en) * | 2013-12-23 | 2015-07-02 | 深圳市华星光电技术有限公司 | Liquid crystal display and method for adjusting brightness and contrast of liquid crystal display |
| CN104159365A (en) * | 2014-07-22 | 2014-11-19 | 合肥鑫晟光电科技有限公司 | Backlight circuit and backlight with same |
| CN104159365B (en) * | 2014-07-22 | 2017-04-05 | 合肥鑫晟光电科技有限公司 | Backlight circuit and backlight |
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Open date: 20081126 |