CN100531507C - Method of dimming control and illuminating system employing same method - Google Patents
Method of dimming control and illuminating system employing same method Download PDFInfo
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- CN100531507C CN100531507C CNB200310118086XA CN200310118086A CN100531507C CN 100531507 C CN100531507 C CN 100531507C CN B200310118086X A CNB200310118086X A CN B200310118086XA CN 200310118086 A CN200310118086 A CN 200310118086A CN 100531507 C CN100531507 C CN 100531507C
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Abstract
The present invention provides one kind of light regulating control method and the lighting system therewith. The lighting system includes one input unit, one light emitting unit and one current controlling unit. The current controlling unit includes one digital controller and one analog controller, and the analog controller includes one current amplitude control circuit and one clamper circuit. The power supply controlling method includes outputting continuous current and regulating current amplitude with the brightness while supplying high brightness, and fixing the output current amplitude with the clamper circuit and regulating current work period with the brightness while supplying low brightness.
Description
Technical field
The present invention relates to a kind of dimming controlling method and use the illuminator of this method, particularly a kind of in conjunction with continuous light tuning technology and discontinuous light regulating technology dimming controlling method and use the illuminator of this method.
Background technology
LCD (Liquid Crystal Display, quality LCD) constantly progresses greatly, and the price continuous slide makes the application of LCD promptly enlarge.Aspect computer application, LCD not only allows the display screen of mobile computer from early stage Video Graphics Array (VideoGraphics Array at 9 o'clock, VGA) proceed to now and extend graphic array (ExtendedGraphic s Array for the moment with ten three, XGA) be standard, and the larger sized monitor field of just entering into, prepare to replace partly cathode ray tube (cathode ray tube, CRT) market of display.In people's livelihood application facet such as auto-navigation system, LCD TV etc., also because the low priceization of LCD and high-qualityization and the feasible selection scheme that becomes gradually.
Because LCD is non-luminiferous display unit, therefore must just can reach the function of demonstration with backlight.The quality of backlight performance is except meeting directly influences the image display quality of LCD, the cost of backlight module accounts for the 3%-5% of LCD, the electric power that is consumed more accounts for 75% of LCD, in the LCD of can saying so quite the basis and important spare part.High meticulous, large-sized LCD, must have high performance backlight technology with cooperate, therefore when the LCD industry is made great efforts the new application of developing, the high performance of backlight technology, lightening etc. as high brightnessization, cost degradation, low consumption electrification, weight and volume, also playing the part of person who has rendered outstanding service's behind the scenes role.
At the light modulation of backlight module, mainly contain two kinds of technology now: one is the continuous light tuning technology, and another is the discontinuous light regulating technology.The continuous light tuning technology is when the brightness that the adjustment backlight module sends, and adjusts the current amplitude that exports luminescence unit to thereupon, and wherein the electric current of being exported is continuous waveform.See also Fig. 1.Fig. 1 is for exporting the current amplitude and the brightness relationship figure of luminescence unit in the known continuous light tuning technology.Among Fig. 1, the brightness that on behalf of backlight module, X direction send, on behalf of backlight module, y direction export the current amplitude of luminescence component to.A
MaxFor backlight module can export the maximum current of luminescence unit to, correspond to the high-high brightness B that backlight module sends
MaxYet, because have leakage current A during electric current input luminescence component
0Generation, therefore, little of A if backlight module exports the current amplitude of luminescence unit to
0The time, behind the deduction leakage current, the other end of luminescence component is just without any electric current, and bright and the situation that the other end does not work of an end will take place in this luminescence component at this moment.For keeping the backlight quality that backlight module provides, avoid the situation that the other end does not work as above-mentioned luminescence component one end is bright to take place, backlight module can set one greater than leakage current A usually
0Current amplitude lower limit A
Min, the brightness that this moment, backlight module can send promptly is decided to be backlight module and presets the minimum brightness B that sends
MinThe shortcoming of continuous light tuning technology maximum is that promptly it is subject to the existence of this leakage current, may be output to the current ratio deficiency of luminescence unit, so the brightness ratio that backlight module can send is also not enough.In the existing technology, the brightness ratio of continuous light tuning technology only can reach about 3: 1 approximately.
As for the discontinuous light regulating technology, as its name suggests, be to adjust the brightness that backlight module is sent in the mode that discontinuous is lighted luminescence component, that is the electric current of output fixed amplitude is to luminescence unit, and, adjust the work period (dutycycle) of the electric current that exports luminescence unit to adjusting the brightness that backlight module sends.When the brightness of sending when backlight module was high, the work period of adjusting the electric current that exports luminescence unit to was high (the highest can be 1); When the brightness of sending when backlight module was low, the work period of adjusting the electric current that exports luminescence unit to was low.Compared to the continuous light tuning technology, the benefit of discontinuous light regulating technology is that it fixedly exports the current amplitude of luminescence unit to, therefore needn't worry the problem of leakage current, even and when the work period of the electric current that exports luminescence unit to transfers to very little and makes that average current is very low, the problem that luminescence unit can't uniformly light-emitting still can not take place, as average current in a common application in addition can be low to moderate 0.5 milliampere still can be normally luminous; Therefore the average current that may be output to luminescence unit in the discontinuous light regulating technology is bigger frequently, so the brightness ratio of backlight module is sufficient.But in the discontinuous light regulating technology, fluorescent tube is discontinuous to be lighted, and therefore cause backlight module to have bigger noise, and this is a unexistent shortcoming in the continuous light tuning technology.
Along with the LCD improvement of Manufacturing Technology, production capacity and output all rise, thereby make the rapid downslide of LCD price.The price of significantly making a price reduction backlight module of LCD also causes sizable impact, and manufacturer tries every possible means and reduces the cost of backlight module.In order to reduce the cost that backlight module is made, manufacturer often cooperates the power supply of lower cost, thereby make the noise of backlight module increase, and the discontinuous big noise that is caused of lighting of fluorescent tube then is tantamount to make the matter worse in the discontinuous light regulating technology at this moment, and seeming is difficult to stand.So far in then visible traditional light regulating technology, the shortcoming that is difficult to doublely of low noise and high brightness ratio.
Summary of the invention
Therefore main purpose of the present invention be to provide a kind of illuminator and in this illuminator employed dimming controlling method, to improve the problems referred to above.
According to the present invention, disclosed a kind of dimming controlling method of illuminator.In the present invention, when with the brightness of luminescence unit during by second value changed into greater than first value of one first predetermined value greater than this first predetermined value, this strength control signal adjustment exports the amplitude of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the amplitude with respect to this second value; When with the brightness of this luminescence unit during by the 4th value changed into less than the 3rd value of one second predetermined value less than this second predetermined value, this strength control signal adjustment exports the work period (duty cycle) of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the work period with respect to the 4th value; When with the brightness of this luminescence unit during by the 6th value changed into greater than the 5th value of this second predetermined value less than this second predetermined value, this strength control signal will export fixed amplitude to the 3rd predetermined value of the electric current of this luminescence unit to, adjustment exports the work period of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the work period with respect to the 6th value; And when with the brightness of this luminescence unit during by the 8th value changed into less than the 7th value of this first predetermined value greater than this first predetermined value, the work period that this strength control signal will export the electric current of this luminescence unit to is fixed to one the 4th predetermined value, adjustment exports the amplitude of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the amplitude with respect to the 8th value.
According to the present invention, also disclosed an illuminator, it comprises: an input unit is used for producing a strength control signal; One luminescence unit, it comprises at least one light tube group; And a current control unit, being electrically connected to this input unit and this luminescence unit, it comprises: a digitial controller is used for controlling work period of the electric current that exports this luminescence unit to; And an analog controller, it comprises: a current amplitude control circuit is used for controlling the amplitude of the electric current that exports this luminescence unit to; And a clamp circuit, be used for making the amplitude of the electric current that exports this luminescence unit to be not less than one the 5th predetermined value.
Description of drawings
Fig. 1 is for exporting the current amplitude and the brightness relationship figure of luminescence unit in the known continuous light tuning technology.
Fig. 2 is an illuminator schematic diagram of the present invention.
Fig. 3 is the current amplitude that exports luminescence unit to and the work period and the brightness relationship figure of the first embodiment of the present invention.
Fig. 4 is the current amplitude that exports luminescence unit to and the work period and the brightness relationship figure of the second embodiment of the present invention.
The reference numeral explanation
Current amplitude control circuit 232
Embodiment
See also Fig. 2.Fig. 2 is an illuminator schematic diagram of the present invention.200 is a backlight module, and it comprises an input unit 210, is used for producing a strength control signal; One luminescence unit 260, it comprises two light tube group 270A and 270B; One current control unit 220, be electrically connected to input unit 210, be used for the amplitude and the work period (duty cycle) of the strength control signal control output current imported according to input unit 210, it comprises: a digitial controller 240 is used for controlling work period of output current; And an analog controller 230, it comprises: a current amplitude control circuit 232 is used for controlling the amplitude of output current; And a clamp circuit 234, be used for making the amplitude of output current to be not less than a predetermined value, this clamp circuit can be one and comprises the pressure limiting circuit of a diode or be other circuit design.This input unit also is used for importing a direct current voltage to this current control unit, and this current control unit also to be used for controlling the electric current that exports this luminescence unit to be alternating current.Current control unit 220 exports electric current to drive circuit 250A and 250B, is responsible for respectively driving light tube group 270A and 270B with AC power by drive circuit 250A and 250B; Light tube group 270A and 270B are electrically connected on protection feedback circuit 280A and 280B more respectively, be responsible for the execute protection circuit and the function of feedback message to current control unit 220 is provided by protection feedback circuit 280A and 280B.
See also Fig. 3.Fig. 3 is for exporting current amplitude and the work period and the brightness relationship figure of luminescence unit in the first embodiment of the present invention.In the graph of a relation of Fig. 3, the brightness that on behalf of backlight module, X direction send, on behalf of backlight module, y direction export the work period of the current amplitude and the electric current of luminescence component to.In the present invention, backlight module is when providing higher brightness, and the current amplitude that exports luminescence component with the control of continuous light tuning technology to is to adjust brightness; And when providing, fixedly export the current amplitude of luminescence component to than low-light level, and, adjust the work period of the electric current that exports luminescence component to the discontinuous light regulating technology.For instance, the power supply control mode can be designed to when desiring to provide one greater than B shown in Figure 3
1Brightness the time, the mode that exports the current amplitude of luminescence component with control to is adjusted brightness, even also the work period of electric current is fixed on D
Max, be 1 in this example; And when desiring to provide one less than B shown in Figure 3
1Brightness the time, the current amplitude that fixedly exports luminescence component to is A
Min, and the mode of work period that exports the electric current of luminescence component with adjustment to is adjusted brightness, even also the work period of electric current transfers to D
MaxAnd D
MinIn one the value.Please be simultaneously referring to Fig. 2 and Fig. 3.For example when desire with brightness by B
mBe adjusted into B
nThe time, input unit 210 can produce a strength control signal and be sent to current control unit 220.Because B
mAnd B
nAll greater than B
1So digitial controller 240 maintains 1 with the work period of output current, and the current amplitude control circuit 2 32 in the analog controller 230 can be with the amplitude of output current by corresponding to B
mA
mTransfer to corresponding to B
nA
nWhen desire with brightness by B
nBe adjusted into less than B
1B
pThe time, the strength control signal that input unit 210 is produced can make the work period of digitial controller 240 control output currents transfer to corresponding to brightness B by 1
pD
p, the clamp circuit 234 in the analog controller 230 then makes the fixed amplitude of output current at A
MinAnd desire with brightness by B
pBe adjusted to equally less than B
1B
qThe time, clamp circuit 234 with the fixed amplitude of output current at A
Min, the work period that digitial controller 240 is then controlled output current is by corresponding to brightness B
pD
pTransfer to corresponding to brightness B
qD
qIf desire with brightness by B
qBe adjusted to brightness greater than B
1B
nThe time, the work period that the strength control signal that input unit 210 is produced can make digitial controller 240 control output currents is by corresponding to brightness B
qDq transfer to D
Max, just 1, and the current amplitude control circuit 232 in the analog controller 230 can be with the amplitude of output current by A
MinTransfer to corresponding to B
nA
n
In the present invention, corresponding to the current amplitude that exports luminescence unit to by greater than minimum amplitude A
MinEnter minimum amplitude A
MinBrightness, with corresponding to the current duty cycle that exports luminescence unit to by entering 1 brightness less than 1, can not be same value; Also can there be a brightness section to be designed to change adjustment current amplitude and current duty cycle simultaneously with brightness.See also Fig. 4.Fig. 4 is for exporting current amplitude and the work period and the brightness relationship figure of luminescence unit in the second embodiment of the present invention.As Fig. 3, in the graph of a relation of Fig. 4, the brightness that on behalf of backlight module, X direction send, on behalf of backlight module, y direction export the work period of the current amplitude and the electric current of luminescence component to.Be all in the graph of a relation of Fig. 4 and the graph of a relation of Fig. 3 when brightness greater than B
1The time, current duty cycle is fixed as D
MaxAnd the difference of two graphs of a relation be in Fig. 4 when brightness less than B
2The time, current amplitude is fixed as A
Min, and B
2Be not equal to B
1For example when desire with brightness by less than B
1And B
2B
tTransfer between B
2With B
1Between B
rThe time, the strength control signal that input unit 210 is produced is sent to current control unit 220, digitial controller 240 can with work period of output current by corresponding to brightness B
tD
tFurnishing is corresponding to brightness B
rD
r, and the current amplitude control circuit 232 in the analog controller 230 can be with the amplitude of output current by A
MinTransfer to corresponding to B
rA
rWhen desire with brightness by B
rBe adjusted into equally between B
2With B
1Between B
sThe time, the work period that the strength control signal that input unit 210 is produced can make digitial controller 240 control output currents is by corresponding to brightness B
rD
rFurnishing is corresponding to brightness B
sD
s, analog controller 230 then together with work period of time control output current by corresponding to brightness B
rA
rFurnishing is corresponding to brightness B
sA
sThat is to say, when brightness is changed between B
2With B
1Between when value, digitial controller 240 all can be done in order to change current duty cycle and the current amplitude corresponding to this brightness with analog controller 230.When application is of the present invention, can design B according to demands of applications
2With B
1Between interval width so that the brightness ratio of backlight module is enough big, and noise reduces as far as possible.
When the luminescence unit of illuminator of the present invention has many group light tube group, and it is during by different driving circuit controlling and driving, the control of the work period of output current when providing than low-light level, can be designed to export discontinuous current to different light tube group, the noise that is produced with further attenuating backlight module with out of phase.See also Fig. 2.Backlight module 200 among Fig. 2 promptly has two light tube group 270A and 270B, is responsible for driving respectively by drive circuit 250A and 250B.The brightness of desiring to provide when backlight module 200 is less than the B among Fig. 3
1Certain brightness B
pThe time, the current amplitude of current control unit control Driver Circuit 250A and 250B input light tube group 270A and 270B is A
Min, and current duty cycle is corresponding to B
pD
pAnd the electric current of input light tube group 270A and 270B can be and has 180 ° and differ, and the work period is all D
pDiscontinuous current.Thus, then entire backlight source module 200 reduces in the current change quantity of same time output, and the noise that it produced also thereby reduce.
In sum, the invention provides the dimming controlling method of a kind of illuminator in conjunction with continuous light tuning technology and discontinuous light regulating technology, preamble is also enumerated the current amplitude of change brightness under the different situations and the control method of work period in each embodiment.Illuminator of the present invention is when providing higher brightness, and the current amplitude that exports luminescence component with the control of continuous light tuning technology to is to adjust brightness; And when providing, fixedly export the current amplitude of luminescence component to than low-light level, and, adjust the work period of the electric current that exports luminescence component to the discontinuous light regulating technology, and fixedly export the current amplitude of luminescence component at this moment to clamp circuit.The benefit of design of the present invention is, output continuous current when higher brightness is provided but not work period can be lowered the noise that backlight module produces less than 1 backlash current; And when providing and adjust current duty cycle than low-light level, the average current that can make backlight module output is than increasing, and the current design that exports different light tube group to can be differed further reducing noise for having mutually, the fixed current amplitude makes it be not less than a predetermined value and then can avoid the existence of due to leakage current and make the problem that luminescence unit can't uniformly light-emitting.That is to say, the present invention is with the advantage of known continuous light tuning technology and discontinuous light regulating technology, and when being provided, higher brightness avoided the excessive shortcoming of known discontinuous light regulating technology noise, the current amplitude of luminescence component then fixedly is provided to clamp circuit when providing than low-light level, guarantee problem that luminescence unit can due to leakage current and can't uniformly light-emitting, improved the shortcoming in the known technology.
At present mobile computer often uses cold-cathode tube etc. and light guide plate, diffusion sheet (diffuser), reflecting plate with common composition with the backlight liquid crystal display module.Cold-cathode fluorescent assembly (Cold CathodeFluorescent Lamp, CCFL) because of the mode of tending to act of its simple electrode and low complex degree, its durability and useful life are all longer, also make it become present mobile computer and other and emphasize the LCD Panel of the electronic installation of portability (Liquid Crystal Display, LCD) the normal backlight that uses.Backlight module power control method of the present invention is applicable to the main flow assembly cold-cathode tube of present LCD or other luminescence component display backlight source module as luminescence unit.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (14)
1. the dimming controlling method of an illuminator, this illuminator comprises an input unit, is used for producing a strength control signal, and a luminescence unit, and this method comprises the following step:
(a) when the brightness of this luminescence unit during by second value changed into greater than first value of one first predetermined value greater than this first predetermined value, this strength control signal adjustment exports the amplitude of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the amplitude with respect to this second value;
(b) when the brightness of this luminescence unit during by the 4th value changed into less than the 3rd value of one second predetermined value less than this second predetermined value, this strength control signal adjustment exports the work period of the electric current of this luminescence unit to, and output current to this luminescence unit with work period with respect to the 4th value, wherein this first predetermined value is greater than this second predetermined value;
(c) when the brightness of this luminescence unit during by the 6th value changed into greater than the 5th value of this second predetermined value less than this second predetermined value, this strength control signal will export fixed amplitude to the 3rd predetermined value of the electric current of this luminescence unit to, adjustment exports the work period of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the work period with respect to the 6th value; And
(d) when the brightness of this luminescence unit during by the 8th value changed into less than the 7th value of this first predetermined value greater than this first predetermined value, the work period that this strength control signal will export the electric current of this luminescence unit to is fixed to one the 4th predetermined value, adjustment exports the amplitude of the electric current of this luminescence unit to, and outputs current to this luminescence unit with the amplitude with respect to the 8th value.
2. the method for claim 1, this method also comprises step:
(e) change into less than this first predetermined value by one the 9th value and during when the brightness of this luminescence unit greater than the tenth value of this second predetermined value, this strength control signal adjustment exports the amplitude and the work period of the electric current of this luminescence unit to, and outputs current to this luminescence unit with amplitude and the work period with respect to the tenth value.
3. the method for claim 1, wherein the 4th predetermined value is 1.
4. the method for claim 1, wherein this luminescence unit comprises many group light tube group, the step of this method (b) or (c) also comprise to have between the electric current that makes the different light tube group of input and differ.
5. method as claimed in claim 2, wherein this luminescence unit comprises many group light tube group, and the step of this method (e) also comprises to have between the electric current that makes the different light tube group of input and differs.
6. the method for claim 1, wherein step (a) or (d) be the continuous alternating current of output one.
7. the method for claim 1, wherein step (b) or (c) be output one discontinuous alternating current.
8. method as claimed in claim 2, wherein step (e) is output one discontinuous alternating current.
9. illuminator, it comprises:
One input unit is used for producing a strength control signal;
One luminescence unit, it comprises at least one light tube group; And
One current control unit is electrically connected to this input unit and this luminescence unit, is used for outputing current to this luminescence unit according to this strength control signal, and it comprises:
One analog controller, it comprises:
One current amplitude control circuit is used for controlling the amplitude of the electric current that exports this luminescence unit to; And
One clamp circuit is used for making the amplitude of the electric current that exports this luminescence unit to be not less than a predetermined value; And
One digitial controller is used for controlling work period of the electric current that exports this luminescence unit to.
10. illuminator as claimed in claim 9; it also comprises a protection feedback unit; be electrically connected on this luminescence unit and this current control unit; be used for the function of execute protection circuit and feedback, wherein this current control unit also outputs current to this luminescence unit according to the signal that this protection feedback unit produces.
11. illuminator as claimed in claim 9 wherein has between the electric current of different light tube group and differs.
12. illuminator as claimed in claim 9, wherein this input unit also is used for importing a direct current voltage to this current control unit, and this current control unit also to be used for controlling the electric current that exports this luminescence unit to be alternating current.
13. illuminator as claimed in claim 9, wherein this current control unit is exported an alternating current to this luminescence unit.
14. illuminator as claimed in claim 9, wherein this light tube group is a cold-cathode fluorescent assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310118086XA CN100531507C (en) | 2003-11-24 | 2003-11-24 | Method of dimming control and illuminating system employing same method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200310118086XA CN100531507C (en) | 2003-11-24 | 2003-11-24 | Method of dimming control and illuminating system employing same method |
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| CN1622736A CN1622736A (en) | 2005-06-01 |
| CN100531507C true CN100531507C (en) | 2009-08-19 |
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| CNB200310118086XA Expired - Fee Related CN100531507C (en) | 2003-11-24 | 2003-11-24 | Method of dimming control and illuminating system employing same method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101897239A (en) * | 2007-12-14 | 2010-11-24 | 皇家飞利浦电子股份有限公司 | Dimmable light generating device |
| CN101466185B (en) * | 2007-12-21 | 2014-02-12 | 立锜科技股份有限公司 | Light adjusting circuit and method |
| CN101656049B (en) * | 2008-08-18 | 2012-11-21 | 北京京东方光电科技有限公司 | Device and method for controlling brightness of backlight source |
| CN101661708B (en) * | 2008-08-26 | 2014-07-23 | 群创光电股份有限公司 | Display, driving device and driving method thereof |
| CN101562936B (en) * | 2009-05-07 | 2013-05-22 | 福州华映视讯有限公司 | Method for improving and driving reaction time of backlight lighting tube brightness |
| US9468065B2 (en) * | 2014-10-15 | 2016-10-11 | Texas Instruments Incorporated | Combined hybrid and local dimming control of light emitting diodes |
| CN106658840A (en) * | 2016-12-09 | 2017-05-10 | 上海航空电器有限公司 | Methods and device used for controlling luminance of airplane LED indication lamp |
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Granted publication date: 20090819 Termination date: 20131124 |