CN1779750A - Controller of light-emitting diode and controlling method thereof - Google Patents

Controller of light-emitting diode and controlling method thereof Download PDF

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Publication number
CN1779750A
CN1779750A CN 200410091357 CN200410091357A CN1779750A CN 1779750 A CN1779750 A CN 1779750A CN 200410091357 CN200410091357 CN 200410091357 CN 200410091357 A CN200410091357 A CN 200410091357A CN 1779750 A CN1779750 A CN 1779750A
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led
signal
light intensity
coupled
sensing
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CN 200410091357
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CN100403358C (en
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陈正芳
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Fujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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PULIER SCIENCE AND TECHNOLOGY Co Ltd
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Abstract

A method for controlling LED includes generating a control signal to drive a LED for sensing a light intensity value of LED so as to selectively regulate said control signal based on said value and then to dynamically regulate light intensity of LED. In the method, a simple driving circuit design is applied to realize aim of regulating current flowing through LED dynamically.

Description

Light emitting diode control device and method thereof
Technical field
The present invention relates to a kind of light emitting diode (LED), the control device of especially a kind of LED and method thereof.
Background technology
In recent years, along with the fast development of light emitting diode (LED) technology, the luminous efficacy of LED is become better and better, and manufacturing cost also reduces gradually, so its range of application is also increasingly extensive.But, LED can cause catabiosis because of long-time operation, and reduces brightness, and this as with the projector of LED as light source, also can cause color saturation not good on some is used.At this moment, may just need dynamically to adjust the electric current of the LED that flows through, to change its brightness.
In addition, in application with the LED modules with different colors colour mixture, the white light LEDs that forms with red, green, blue three-color LED colour mixture for example, may be owing to certain look LED wherein variance factor during aging or other operation, and cause the result of last colour mixture unbalance, and depart from the color that originally will mix.At this moment,, and then dynamically adjust the electric current of LED of all kinds,, just can make last colour mixture result be tending towards desirable to change blending ratio of all kinds if can judge the degree that it departs from according to the result of actual colour mixture.
Summary of the invention
The purpose of this invention is to provide a kind of light emitting diode (LED) control device and method thereof, can dynamically adjust the electric current of the LED that flows through according to the light intensity of LED actual displayed, to change the light intensity of LED.
Another object of the present invention provides a kind of LED control device and method thereof, can adjust the blending ratio of LED of all kinds by the electric current of dynamically adjusting the LED that flows through, and last colour mixture result is reached to predefined ideal case.
A further object of the present invention provides a kind of LED drive unit, can utilize easy circuit design, reaches the effect of dynamic adjustment LED electric current.
For reaching aforementioned purpose, LED control device of the present invention comprises a sensing cell, a control module and a driver element.But the light intensity of sensing cell sensing one LED, and the sensing signal of exporting a correspondence is to control module.Control module is adjusted output one controlling signal more according to this to driver element, to drive this LED.Wherein, control module can be judged whether the light intensity of this LED meets a setting value, and then dynamically adjust this controlling signal according to this sensing signal.
On the other hand, LED control method of the present invention comprises: produce a controlling signal, to drive a LED; The light intensity value of this LED of sensing; And, optionally adjust this controlling signal according to this light intensity value.
On the other hand, LED drive unit of the present invention comprises: a LED unit, can send the light intensity of a correspondence according to a driving signal; One first adjustment unit can (output one be adjusted signal to this LED unit, to adjust its light intensity for pulse widthmodulation, PWM) signal according to a width modulation; And one second adjustment unit, an exportable feedback signal, wherein, this feedback signal is in order to determine this driving signal.
The present invention is described in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the calcspar of a preferred embodiment of LED control device of the present invention;
Fig. 2 is the calcspar of a preferred embodiment of the control module of Fig. 1;
Fig. 3 is the calcspar of a preferred embodiment of the driver element of Fig. 1;
Fig. 4 is the thin portion circuit diagram of the drive unit embodiment of Fig. 3;
Fig. 5 is the process flow diagram of a preferred embodiment of LED control method of the present invention.
Description of reference numerals: 10LED control device; 11 sensing cells; 12 control modules; 121 analog-to-digital converters; 122 microprocessors; 123 storeies; 13 driver elements; The 131LED unit; 132 first adjustment units; 133 second adjustment units; The flow process of one preferred embodiment of 51～57LED control method.
Embodiment
Fig. 1 is the calcspar of a preferred embodiment of LED control device of the present invention.As shown in Figure 1, LED control device 10 comprises a sensing cell 11, a control module 12 and a driver element 13.Sensing cell 11 is in order to detecting the LED light intensity of (be positioned at driver element 13, Fig. 1 does not show), and exports the sensing signal of a correspondence.In one embodiment, sensing cell 11 utilizes a photodiode (photodiode) (not shown) to detect the light intensity of this LED.
Control module 12 is coupled to sensing cell 11, and the sensing signal that can be exported according to sensing cell 11 judges whether the light intensity of this LED meets a setting value, to produce a controlling signal, delivers to driver element 13.When light intensity met setting value, control module 12 was kept output controlling signal originally, makes driver element 13 keep the light intensity that meets setting value.Yet when light intensity did not meet setting value, control module 12 can be adjusted controlling signal, makes driver element 13 can change the light intensity (hereinafter can describe in detail again) of LED according to this.In one embodiment, this led color redness, green and blue three one of them, and this LED is used for blending white light.(Commission Internationalde L ' Eclairage, CIE) chromaticity coordinate that is proposed (colorimetry) decides aforementioned setting value according to international lighting association.In the cie color coordinate, white can be expressed as the linear combination of red, green, blue three looks, and therefore, shared ratio of all kinds promptly can be used to determine setting value herein.
Light intensity is adjusted to meet setting value after, control module 12 also can be further by controlling signal and the follow-up measured sensing signal that relatively be exported, judge whether this LED wears out.That is, control module 12 can be recorded in controlling signal value and pairing sensing signal ideal value in one form, and be lower than more than a certain predeterminable level of ideal value when sensing signal actual value, the luminous intensity of expression LED does not reach expection, and it is aging to be that decidable LED has produced this moment.If judged result represents that for aging the follow-up ratio of this LED is easier to occur departing from the situation of setting value, so control module 12 can require sensing cell 11 after short time, must detect once again.If judged result is for still unaged, then represent the follow-up situation that setting value more can not occur departing from of this LED, so control module 12 can require sensing cell 11 after the time of growing, just need detect once again.
Fig. 2 is the calcspar of a preferred embodiment of the control module 12 of Fig. 1.In Fig. 2, control module 12 comprises an analog-to-digital converter (analog-to-digital converter, ADC) 121, one microprocessor (microprocessor) 122 and a storer 123.Analog-to-digital converter 121 can be converted to the sensing signal of aforementioned simulation the light intensity response of one numeral.But the corresponding relation of storer 123 record controls signal values and desirable light intensity response is as the usefulness of judging that whether LED wears out.122 of microprocessors are coupled to analog-to-digital converter 121 and storer 123, and the actual light intensity response that can be provided according to analog-to-digital converter 121 is carried out relevant computing, whether meets setting value with the light intensity of judging this LED.In addition, microprocessor 122 also can reference-to storage 123, and to judge whether LED produces aging to calculate the gap of actual light intensity response and ideal value, to use.
Driver element 13 is coupled to control module 12, and the controlling signal that can be provided according to control module 12 drives inner this LED (Fig. 1 does not show).Fig. 3 is the calcspar of a preferred embodiment of the driver element 13 of Fig. 1.As shown in Figure 3, driver element 13 comprises a LED unit 131, one first adjustment unit 132 and one second adjustment unit 133.In this embodiment, the controlling signal that provided of control module 12 comprise one drive signal, a width modulation (PWM) signal and switches signal.LED unit 131 comprises aforesaid LED and control circuit, can switch signal according to this, does switching between luminous and not luminous two states.And, also receive this driving signal, to drive this LED, send the light intensity of a correspondence.
First adjustment unit 132 can receive the PWM signal, produces one and adjusts signal, sends into LED unit 131, to adjust the light intensity of this LED.By the pulsewidth that changes the PWM signal, can correspondingly produce different adjustment signals, and to adjust light intensity in various degree.Second adjustment unit 133 is delivered to control module 12 in order to produce a feedback signal, and control module 12 produces this corresponding driving signal then according to this feedback signal.So, by adjusting this feedback signal, also can change the driving signal, and then adjust the light intensity of LED.In addition, second adjustment unit 133 also can switch signal according to this, when luminance switches to not luminance, provides the function of quickening the LED discharge in LED unit 131, makes it can switch more fast and accurate.
Fig. 4 is the thin portion circuit diagram of driver element 13 embodiment of Fig. 3.As shown in Figure 4, LED unit 131 comprises: a LED receives aforesaid driving signal; One N NMOS N-channel MOS N (N-channel metal oxide semiconductor, NMOS) Q1 is coupled to this LED, can be used as a switch; And a resistance R 1, one end ground connection, the other end then is coupled to the drain electrode (drain) of NMOS Q1.First adjustment unit 132 comprises: an operational amplifier OP1, have a normal phase input end, a negative-phase input and an output terminal, and wherein this negative-phase input is in order to receive aforesaid PWM signal, and this normal phase input end is ground connection then; One resistance R d, cross-over connection is in negative-phase input and the output terminal of operational amplifier OP1; And a resistance R s, be coupled between this output terminal and the LED unit 131.133 of second adjustment units comprise: a power Vcc; One resistance R 2 is coupled to power Vcc; One Q2 of P channel metal-oxide-semiconductor (MOS) (PMOS) can be used as a switch; One variable resistor R3 is coupled between the source electrode (source) of power Vcc and PMOS Q2; And a resistance R 4, cross-over connection is between the source electrode of NMOS Q1 and PMOS Q2.
As shown in Figure 4, switch the grid (gate) that signal puts on Q1 and Q2, can make not conducting simultaneously of Q1 and Q2.When the Q1 conducting, not conducting of Q2.At this moment, by driving voltage V i(being aforesaid driving signal) can produce the electric current LED that flows through, and makes LED luminous.132 of first adjustment units utilize OP1, and the PWM signal that control module 12 is provided converts corresponding adjustment electric current to and sends into LED unit 131, so can produce the fine setting effect to the electric current of the LED that flows through.In addition, second adjustment unit 133 is by the resistance of adjusting R3, but feedback one magnitude of voltage V f(being aforesaid feedback signal) is to control module 12, to produce corresponding driving voltage V iCan reach the effect of coarse adjustment LED electric current with respect to first adjustment unit, 132, the second adjustment units 133.On the other hand, when the Q2 conducting, not conducting of Q1.At this moment, the Q2 of conducting can provide the path of a discharge, quickens the discharge of LED, to reach the effect of aforementioned quick switching.
Fig. 5 is the process flow diagram of a preferred embodiment of LED control method of the present invention.As shown in Figure 5, this flow process comprises the following step:
51 produce a controlling signal, to drive a LED;
The light intensity value of 52 these LED of sensing;
53 judge whether this light intensity value meets a setting value, if then skip to step 55, then continue the following step if not;
54 adjust this controlling signal, and rebound step 52;
55 judge that whether this LED is aging, then skips to step 57, if not if then continue the following step;
After 56 one very first times of wait, rebound step 52; And
After 57 one second times of wait, rebound step 52, wherein, this very first time is this second time that is shorter than.
If step 53 judges that this light intensity value does not meet setting value, then repeated execution of steps 52 to 54, meet setting value until this light intensity value.In one embodiment, red, the green and blue three of this led color system one of them, and in the step 53, this setting value is according to aforesaid cie color coordinate decision.
In addition, if this light intensity value meets setting value, then in step 55, judge further whether LED is aging.Be by controlling signal that is produced and follow-up measured light intensity value herein, judge.If judged result for being, is then proceeded step 56, after the short very first time, return step 52 and detect again.If judged result then through after the second long time, is just got back to step 52 and is detected for not.
More than utilize preferred embodiment to describe the present invention in detail, but do not limit the scope of the invention.Therefore, all those of ordinary skills all can understand, suitably do slightly change and adjustment, will not lose main idea of the present invention place, also do not break away from the spirit and scope of the present invention, all should be considered as further enforcement of the present invention.

Claims (15)

1, a kind of light emitting diode (LED) control device comprises:
One sensing cell, the light intensity of sensing one LED, and export the sensing signal of a correspondence;
One control module is coupled to this sensing cell, exports a controlling signal according to this sensing signal; And
One driver element is coupled to this control module, according to this controlling signal driving LED.
2, LED control device as claimed in claim 1, wherein, this control module judges according to this sensing signal whether the light intensity of this LED meets a setting value.
3, LED control device as claimed in claim 2, wherein this control module comprises:
One A/D converter is converted to this sensing signal the light intensity response of one numeral; And
One microprocessor is coupled to this analog-to-digital converter, according to this light intensity response, judges whether the light intensity of this LED meets this setting value.
4, LED control device as claimed in claim 1, wherein, this controlling signal comprises a width modulation signal, and this driver element comprises one first adjustment unit, adjusts the light intensity of this LED in order to foundation width modulation signal.
5, LED control device as claimed in claim 1, wherein, this driver element comprises one second adjustment unit, and in order to produce a feedback signal, this control module is according to the feedback signal, and output one drives signal, with driving LED.
6, a kind of LED control method comprises:
Produce a controlling signal, to drive a LED;
The light intensity value of this LED of sensing; And
According to this light intensity value, optionally adjust this controlling signal.
7, LED control method as claimed in claim 6, wherein this set-up procedure comprises:
Judge whether this light intensity value meets a setting value; And
When this light intensity value does not meet this setting value, adjust this controlling signal.
8, LED control method as claimed in claim 7 also comprises:
Repeat this sensing step and this set-up procedure, meet this setting value until this light intensity value.
9, LED control method as claimed in claim 7, wherein this set-up procedure also comprises:
When this light intensity value meets this setting value, and then judge whether this LED is aging;
When this LED aging, then through repeating this sensing step and this set-up procedure after the very first time; And
When this LED unaged, then through repeating this sensing step and this set-up procedure after one second time;
Wherein, this very first time is this second time that is shorter than.
10, LED control method as claimed in claim 9 judges wherein whether aging step comprises comparison this controlling signal that produces and this light intensity value that is sensed to LED.
11, a kind of LED drive unit comprises:
One LED unit according to a driving signal, sends the light intensity of a correspondence; And
One first adjustment unit is coupled to this LED unit, and according to a pulse-width modulation PWM signal, output one is adjusted signal to this LED unit, to adjust the light intensity of this LED unit.
12, as the described LED drive unit of Shen claim 11, wherein this first adjustment unit comprises:
One operational amplifier has a normal phase input end, a negative-phase input and an output terminal, and wherein this negative-phase input is in order to receive this PWM signal, this positive input end grounding;
One resistance R d, cross-over connection is in this negative-phase input and this output terminal of this operational amplifier; And
One resistance R s is coupled between this output terminal and this LED unit.
13, LED drive unit as claimed in claim 11, wherein the LED unit comprises:
One LED receives this driving signal;
One first switch is coupled to this LED, whether switches signal decision conducting according to one; And
One first resistance, an end ground connection, the other end then is coupled to this first switch.
14, LED drive unit as claimed in claim 13 also comprises:
One second adjustment unit, in order to export a feedback signal, wherein this feedback signal is in order to determine this driving signal.
15, LED drive unit as claimed in claim 14, wherein this second adjustment unit comprises:
One power supply;
One variable resistor is coupled to this power supply, in order to this feedback signal to be provided;
One second resistance is coupled to this power supply;
One second switch is coupled to this second resistance, whether switches signal decision conducting according to this, wherein this first with the not conducting simultaneously of this second switch; And
One the 4th resistance is coupled to this second switch and this first switch room.
CNB2004100913571A 2004-11-23 2004-11-23 Controller of light-emitting diode and controlling method thereof Expired - Fee Related CN100403358C (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101217840B (en) * 2007-12-29 2011-05-25 友达光电股份有限公司 Color controlling method of LED light source system
CN101364380B (en) * 2007-08-08 2012-03-21 奇美电子股份有限公司 Back light module, liquid crystal display and color temperature control method
WO2012083868A1 (en) * 2010-12-22 2012-06-28 利亚德光电股份有限公司 Method and system for monitoring led display screen as well as led display
US8890045B2 (en) 2012-03-01 2014-11-18 Avago Technologies General Ip (Singapore) Pte. Ltd. Optical encoder with a current regulating circuit for a light emitter
CN105872163A (en) * 2016-03-23 2016-08-17 广东欧珀移动通信有限公司 Test result writing method, test result writing apparatus, test system and mobile terminal
CN106257574A (en) * 2015-06-19 2016-12-28 三星显示有限公司 Determine the device of driving voltage
CN107025879A (en) * 2016-01-14 2017-08-08 三星电子株式会社 The self checking method of display system and the display system
CN111141468A (en) * 2018-11-02 2020-05-12 健帆生物科技集团股份有限公司 Blood leakage detection device, detection circuit thereof, and blood leakage detection method

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Publication number Priority date Publication date Assignee Title
US6510995B2 (en) * 2001-03-16 2003-01-28 Koninklijke Philips Electronics N.V. RGB LED based light driver using microprocessor controlled AC distributed power system
US20030111533A1 (en) * 2001-12-19 2003-06-19 Koninklijke Philips Electronics N.V. RGB led based white light control system with quasi-uniform color metric

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101364380B (en) * 2007-08-08 2012-03-21 奇美电子股份有限公司 Back light module, liquid crystal display and color temperature control method
CN101217840B (en) * 2007-12-29 2011-05-25 友达光电股份有限公司 Color controlling method of LED light source system
WO2012083868A1 (en) * 2010-12-22 2012-06-28 利亚德光电股份有限公司 Method and system for monitoring led display screen as well as led display
US8890045B2 (en) 2012-03-01 2014-11-18 Avago Technologies General Ip (Singapore) Pte. Ltd. Optical encoder with a current regulating circuit for a light emitter
CN106257574A (en) * 2015-06-19 2016-12-28 三星显示有限公司 Determine the device of driving voltage
CN107025879A (en) * 2016-01-14 2017-08-08 三星电子株式会社 The self checking method of display system and the display system
CN107025879B (en) * 2016-01-14 2021-11-05 三星电子株式会社 Display system and self-checking method thereof
CN105872163A (en) * 2016-03-23 2016-08-17 广东欧珀移动通信有限公司 Test result writing method, test result writing apparatus, test system and mobile terminal
CN105872163B (en) * 2016-03-23 2018-11-20 广东欧珀移动通信有限公司 Test result wiring method, device and test macro and mobile terminal
CN111141468A (en) * 2018-11-02 2020-05-12 健帆生物科技集团股份有限公司 Blood leakage detection device, detection circuit thereof, and blood leakage detection method

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