CN204392641U - A kind of LED luminance and colourity consistency adjusting device - Google Patents
A kind of LED luminance and colourity consistency adjusting device Download PDFInfo
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- CN204392641U CN204392641U CN201520025221.4U CN201520025221U CN204392641U CN 204392641 U CN204392641 U CN 204392641U CN 201520025221 U CN201520025221 U CN 201520025221U CN 204392641 U CN204392641 U CN 204392641U
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Abstract
The utility model provides a kind of LED luminance and colourity consistency adjusting device, comprise headlight power switch, dimmer, headlight power switch exports large modulating signal to testing circuit, dimmer connects light modulation PWM Acquisition Circuit, testing circuit, light modulation PWM Acquisition Circuit all connect microprocessing unit, microprocessing unit connects PWM regulating circuit, and PWM regulating circuit connects LED unit, and described PWM regulating circuit also connects described headlight power switch; LCD scintillation when the utility model avoids LED lamplight flicker and does backlight with LED, solves instrument desk, automobile audio panel, the LED lamplight brightness of display and the conforming problem of colourity.
Description
Technical field
The utility model relates to LED luminance and colourity regulation technology field, particularly relates to a kind of LED luminance and colourity consistency adjusting device.
Background technology
Along with automobile industry is to future development that is high-end, hommization, LED is used on automobile equipment in a large number, brings comfortable visual experience to user.Automobile-used LED has been developed into by traditional constant brightness and colourity and has used dimmer to regulate brightness and colourity, brings better visual experience and fail safe, but still have the following disadvantages to user:
1) be used in the automobile display LCD screen with dimmer, when light is lighted, there will be the problem that screen dodges;
2) be used on the in-vehicle device such as Auto Instrument desk, vehicle audio, can because light is excessively bright, brightness and colourity consistency be poor etc., and reason causes lamp from dazzling, cause vision tired out, affect driving safety.For this problem, auto vendor's light (as red colored lamp etc.) dazzling to some colors requires that brightness becomes lower, but brightness step-down proposes a great problem by the product design of Auto Instrument desk, vehicle audio supplier, and the consistency of LED luminance and colourity finally can be made poorer.
Utility model content
The utility model provides a kind of LED luminance and colourity consistency adjusting device, LCD scintillation when avoiding LED lamplight flicker and do backlight with LED, solves instrument desk, automobile audio panel, the LED lamplight brightness of display and the conforming problem of colourity.
For achieving the above object, technical solution adopted in the utility model is:
The utility model provides a kind of LED luminance and colourity consistency adjusting device, comprise the headlight power switch, the dimmer that control headlight and power, described headlight power switch exports large modulating signal to testing circuit, described dimmer connects light modulation PWM Acquisition Circuit, described testing circuit, described light modulation PWM Acquisition Circuit all connect microprocessing unit, described microprocessing unit connects PWM regulating circuit, described PWM regulating circuit connects LED unit, and described PWM regulating circuit also connects described headlight power switch;
Whether described testing circuit is opened for detecting headlight power switch, detects that headlight power switch is opened, and signal of giving notice is to described microprocessing unit, and described microprocessing unit is activated work, output pwm signal;
Described light modulation PWM Acquisition Circuit is for the low frequency pwm signal PWM_ADJ of setting duty cycle range that gathers dimmer and export and export PWM_IN signal and send to described microprocessing unit;
Described microprocessing unit is for exporting high-frequency pwm signal PWM_CTL to PWM regulating circuit, and its duty cycle range is the ratio that described setting duty cycle range is multiplied by LED real work electric current and the LED color-division electric current adjusted as required;
The PWM_CTL signal that described PWM regulating circuit is used for exporting according to described microprocessing unit exports PWM_OUT signal to LED unit.
Further, described testing circuit is provided with the first triode, the base stage of described first triode connects the negative pole of the first diode, the positive pole of the first diode is connected with described headlight power switch, the grounded emitter of described first triode, the collector electrode of described first triode connects the input/output port of described microprocessing unit;
Described light modulation PWM Acquisition Circuit is provided with the second triode, the base stage of described second triode connects one end of the first resistance, the other end of the first resistance connects ground connection after the first electric capacity, the other end of described first resistance also connects the positive pole of the second diode, the negative pole of the second diode connects the output of dimmer, power supply is connect after the base stage of described second triode is also connected in series the second resistance, the emitter of described second triode connects power supply, one end of RC parallel circuits is connect after collector series connection the 3rd resistance of described second triode, the other end ground connection of described RC parallel circuits, described RC parallel circuits is made up of the 4th resistance and the second Capacitance parallel connection, one end of described RC parallel circuits also connects the very first time collection port of described microprocessing unit,
Second time of described microprocessing unit gathers port and connects PWM regulating circuit as signal output part;
Described PWM regulating circuit is provided with the 3rd triode, 4th triode, 5th triode, the base stage of described 3rd triode connects the second time collection port of described microprocessing unit, the grounded emitter of described 3rd triode, the base stage of the 4th triode is connected after collector series connection the 5th resistance of described 3rd triode, the collector electrode of the 5th triode is connected after base stage serial connection the 6th resistance of the 4th triode, the collector electrode of the 5th triode is connected after emitter serial connection the 7th resistance of the 4th triode, the collector electrode of the 5th triode connects the negative pole of described first diode, the collector electrode of the 5th triode also connects the one end of the parallel circuits that the 3rd electric capacity and polar capacitor are formed, the other end ground connection of described parallel circuits, the collector electrode of the 4th triode connects the base stage of the 5th triode, the base stage of the 5th triode also connects the negative pole of Schottky diode, the plus earth of described Schottky diode, the emitter of described 5th triode connects described LED unit,
Described LED unit is provided with light-emitting diode, connects the emitter of described 5th triode, the minus earth of described light-emitting diode after positive pole serial connection the 8th resistance of described light-emitting diode.
The beneficial effects of the utility model are: the utility model gathers low-frequency pwm signal of dimmer by microprocessor unit, then microprocessor unit exports the pwm signal with dimmer different duty, higher frequency, can affect the problem of shielding flicker when LED does LCD screen backlight when solving dimmer low frequency;
The utility model also gathers the pwm signal of the setting duty cycle range of dimmer by microprocessing unit, then the color-division electric current that the actual current that goes out of brightness adjustment is as required different from LED is directly proportional, and exports described setting duty cycle range be multiplied by LED real work electric current and the duty ratio of the ratio of LED color-division electric current and reach good consistency when Auto Instrument desk, vehicle audio panel light are the brightest by microprocessor.
Accompanying drawing explanation
Fig. 1 is the structural representation of LED luminance of the present utility model and colourity consistency adjusting device;
Fig. 2 is the circuit diagram of LED luminance of the present utility model and colourity consistency adjusting device.
Embodiment
Specifically illustrate execution mode of the present utility model below in conjunction with accompanying drawing, accompanying drawing is only for reference and use is described, does not form the restriction to the utility model scope of patent protection.
As shown in Figure 1, embodiment of the present utility model provides a kind of LED luminance and colourity consistency adjusting device on the one hand, comprise the headlight power switch 1, the dimmer 2 that control headlight and power, dimmer, refer to automobile-used dimmer, light environmentally requires the parts regulated instrument desk lamplight brightness in car; Described headlight power switch 1 connection detection circuit 3, described dimmer 2 connects light modulation PWM Acquisition Circuit 4, described testing circuit 3, described light modulation PWM Acquisition Circuit 4 all connect microprocessing unit 5, described microprocessing unit 5 connects PWM regulating circuit 6, described PWM regulating circuit 6 connects LED unit 7, and described PWM regulating circuit 6 also connects described power switch 1;
Whether described testing circuit 3 is opened for detecting headlight power switch 1, detects that headlight power switch 1 is opened, and signal of giving notice is to described microprocessing unit 5, and described microprocessing unit 5 is activated work, output pwm signal;
Described light modulation PWM Acquisition Circuit 4 is for the low frequency pwm signal PWM_ADJ of setting duty cycle range that gathers dimmer 2 and export and export PWM_IN and send to described microprocessing unit 5;
Described microprocessing unit 5 is for exporting high-frequency pwm signal PWM_CTL to PWM regulating circuit 6, and its duty cycle range is the ratio that described setting duty cycle range is multiplied by LED real work electric current and the LED color-division electric current adjusted as required;
Described PWM regulating circuit 6 exports PWM_OUT signal to LED unit 7 for the PWM_CTL signal exported according to described microprocessing unit 5.
As shown in Figure 2, in embodiment of the present utility model, described testing circuit 3 is provided with the first triode Q1, the base stage of described first triode Q1 connects the negative pole of the first diode D1, the positive pole of the first diode D1 is connected with described headlight power switch 1, the grounded emitter of described first triode Q1, the collector electrode of described first triode Q1 connects the input/output port I/O of described microprocessing unit 5; Described headlight power switch 1 opens the base stage of rear output high level signal to described first triode Q1.
Described light modulation PWM Acquisition Circuit 4 is provided with the second triode Q2, the base stage of described second triode Q2 connects one end of the first resistance R1, the other end of the first resistance R1 connects ground connection after the first electric capacity C1, the other end of described first resistance R1 also connects the positive pole of the second diode D2, the negative pole of the second diode D2 connects the output of dimmer 2, power vd D is met after the base stage of described second triode Q2 is also connected in series the second resistance R2, the emitter of described second triode Q2 meets power vd D, one end of RC parallel circuits is connect after collector series connection the 3rd resistance R3 of described second triode Q2, the other end ground connection of described RC parallel circuits, described RC parallel circuits is made up of the 4th resistance R4 and the second electric capacity C2 parallel connection, one end of described RC parallel circuits also connects the very first time collection port TIM1 of described microprocessing unit 5,
Second time of described microprocessing unit 5 gathers port TIM2 and connects PWM regulating circuit 6 as signal output part;
Described PWM regulating circuit 6 is provided with the 3rd triode Q3, 4th triode Q4, 5th triode Q5, the base stage of described 3rd triode Q3 connects the second time collection port TIM2 of described microprocessing unit 5, the grounded emitter of described 3rd triode Q3, the base stage of the 4th triode Q4 is connected after collector series connection the 5th resistance R5 of described 3rd triode Q3, the collector electrode of the 5th triode Q5 is connected after base stage serial connection the 6th resistance R6 of the 4th triode Q4, the collector electrode of the 5th triode Q5 is connected after emitter serial connection the 7th resistance R7 of the 4th triode Q4, the collector electrode of the 5th triode Q5 connects the negative pole of described first diode D1, the collector electrode of the 5th triode Q5 also connects the one end of the parallel circuits that the 3rd electric capacity C3 and polar capacitor EC1 is formed, the other end ground connection of described parallel circuits, the collector electrode of the 4th triode Q4 connects the base stage of the 5th triode Q5, the base stage of the 5th triode Q5 also connects the negative pole of Schottky diode Z1, the plus earth of described Schottky diode Z1, the emitter of described 5th triode Q5 connects described LED unit 7, wherein, the collector electrode of the 5th triode Q5 connects the negative pole of described first diode D1, thus headlight power switch 1 is also powered for PWM regulating circuit 6.
Described LED unit 7 is provided with LED 1, connects the emitter of described 5th triode Q5, the minus earth of described LED 1 after positive pole serial connection the 8th resistance R8 of described LED 1.
In the present embodiment, the PWM_IN signal transacting that described microprocessing unit 5 carries out achieves LED and does the LCD screen backlight used time, and the PWM_CTL frequency that microprocessing unit 5 exports is more than 10 times of LCD refreshing frequency.
The duty cycle range defining method of the PWM_CTL signal that microprocessing unit 5 exports is as follows:
1) the color-division electric current I 1 of LED is determined.LED color-division electric current is LED producer at the brightness of measuring the unified electric current (conventional is 5mA and 20mA) adopted during LED factory testing and chromatic value, is consistency best state when LED is operated in color-division current value.For I1=5mA;
2) the real work electric current I 2 of brightness requirement determination LED as required.Brightness requirement when being operated in 1mA to require LED, i.e. I2=1mA;
The PWM_OUT high level exported after PWM regulating circuit 6 processes is that the voltage stabilizing of PWM regulating circuit 6 exports U, and low level is 0, for U=9V; The pressure drop of LED is U1, for U1=3V;
The duty ratio of the PWM_ADJ signal that dimmer 2 exports is P, and its duty ratio is that graduation exports, for P=20% ~ 100%;
In the present embodiment, because LED luminance is regulated by PWM_OUT, LED can not be operated in color-division electric current I 1 state always, so LED can be made during PWM_OUT signal high level U to be operated in color-division electric current I 1 state, does not work during low level.When LED is operated in color-division electric current I 1 state, current-limiting resistance R8=(U-U1)/I1, can calculate R8=(9V-3V)/5mA=1.2K Ω thus.
Because LED real work electric current is I2, therefore color-division electric current I 1 state shared time scale in whole pulse square wave is LED real work electric current I 2 and the ratio of LED color-division electric current I 1, i.e. I2/I1; That is, the duty cycle range of PWM_CTL signal exported from microprocessing unit 5 is P* (I2/I1).
In the present embodiment, microprocessing unit 5 is in PWM_IN signal processing, also can the brightness range grade of synchronous dimmer 2, but N time need be read to judge that lamplight brightness scope should at upper level still at next stage to the edge portions of each grade when gathering PWM_IN signal, wherein, N >=10.
In the present embodiment, or the duty cycle range of PWM_CTL signal exported after process, in PWM_IN signal processing, also can be classified and process, class requirement >=14 by microprocessing unit 5.
Or, microprocessing unit 5 is in PWM_IN signal processing, also can the brightness range grade of synchronous dimmer 2, but N time need be read to judge that lamplight brightness scope should at upper level still at next stage to the edge portions of each grade when gathering PWM_IN signal, and the duty cycle range graduation of the PWM_CTL signal exported after process is processed, but requirement is not done to the duty cycle range grade of PWM_CTL signal, so that LED can not glimmer when dimmer for light control.
In the present embodiment, PWM regulating circuit 6 is according to PWM_CTL signal, export PWM_OUT signal to LED unit, namely LED unit has the time of P* (I2/I1) * T to be in color-division electric current I 1 operating state in PWM_OUT one-period, have the time of [1-P* (I2/I1)] * T to be in off position, the electric current arriving LED unit is approximately P* (I2/I1) * I1=P*I2; Be I2 time the brightest;
For Fig. 2, when dimmer 2 is the brightest, namely during duty ratio 100%, microprocessing unit 5 exports the PWM_CTL signal that a duty ratio is about 20%, allow 20% time service of LED at 5mA illuminating state like this, in off position, the electric current that each cycle arrives LED is about 20%*5mA=1mA to 80% time service.Namely allow LED be operated in 5mA state, but also reach the brightness requirement of LED.When being dimmed by dimmer, the duty ratio of the PWM_CTL signal that corresponding microprocessing unit 5 exports also reduces, and being specifically adjusted to what degree need carry out practical adjustments according to real vehicle light modulation.
Above disclosedly be only preferred embodiment of the present utility model, rights protection scope of the present utility model can not be limited with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (2)
1. a LED luminance and colourity consistency adjusting device, comprise the headlight power switch, the dimmer that control headlight and power, it is characterized in that: described headlight power switch exports large modulating signal to testing circuit, described dimmer connects light modulation PWM Acquisition Circuit, described testing circuit, described light modulation PWM Acquisition Circuit all connect microprocessing unit, described microprocessing unit connects PWM regulating circuit, described PWM regulating circuit connects LED unit, and described PWM regulating circuit also connects described headlight power switch;
Whether described testing circuit is opened for detecting headlight power switch, detects that headlight power switch is opened, and signal of giving notice is to described microprocessing unit, and described microprocessing unit is activated work, output pwm signal;
Described light modulation PWM Acquisition Circuit is for the low frequency pwm signal PWM_ADJ of setting duty cycle range that gathers dimmer and export and export PWM_IN signal and send to described microprocessing unit;
Described microprocessing unit is for exporting high-frequency pwm signal PWM_CTL to PWM regulating circuit, and its duty cycle range is the ratio that described setting duty cycle range is multiplied by LED real work electric current and the LED color-division electric current adjusted as required;
The PWM_CTL signal that described PWM regulating circuit is used for exporting according to described microprocessing unit exports PWM_OUT signal to LED unit.
2. LED luminance according to claim 1 and colourity consistency adjusting device, is characterized in that:
Described testing circuit is provided with the first triode, the base stage of described first triode connects the negative pole of the first diode, the positive pole of the first diode is connected with described headlight power switch, the grounded emitter of described first triode, the collector electrode of described first triode connects the input/output port of described microprocessing unit;
Described light modulation PWM Acquisition Circuit is provided with the second triode, the base stage of described second triode connects one end of the first resistance, the other end of the first resistance connects ground connection after the first electric capacity, the other end of described first resistance also connects the positive pole of the second diode, the negative pole of the second diode connects the output of dimmer, power supply is connect after the base stage of described second triode is also connected in series the second resistance, the emitter of described second triode connects power supply, one end of RC parallel circuits is connect after collector series connection the 3rd resistance of described second triode, the other end ground connection of described RC parallel circuits, described RC parallel circuits is made up of the 4th resistance and the second Capacitance parallel connection, one end of described RC parallel circuits also connects the very first time collection port of described microprocessing unit,
Second time of described microprocessing unit gathers port and connects PWM regulating circuit as signal output part;
Described PWM regulating circuit is provided with the 3rd triode, 4th triode, 5th triode, the base stage of described 3rd triode connects the second time collection port of described microprocessing unit, the grounded emitter of described 3rd triode, the base stage of the 4th triode is connected after collector series connection the 5th resistance of described 3rd triode, the collector electrode of the 5th triode is connected after base stage serial connection the 6th resistance of the 4th triode, the collector electrode of the 5th triode is connected after emitter serial connection the 7th resistance of the 4th triode, the collector electrode of the 5th triode connects the negative pole of described first diode, the collector electrode of the 5th triode also connects the one end of the parallel circuits that the 3rd electric capacity and polar capacitor are formed, the other end ground connection of described parallel circuits, the collector electrode of the 4th triode connects the base stage of the 5th triode, the base stage of the 5th triode also connects the negative pole of Schottky diode, the plus earth of described Schottky diode, the emitter of described 5th triode connects described LED unit,
Described LED unit is provided with light-emitting diode, connects the emitter of described 5th triode, the minus earth of described light-emitting diode after positive pole serial connection the 8th resistance of described light-emitting diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520025221.4U CN204392641U (en) | 2015-01-14 | 2015-01-14 | A kind of LED luminance and colourity consistency adjusting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520025221.4U CN204392641U (en) | 2015-01-14 | 2015-01-14 | A kind of LED luminance and colourity consistency adjusting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602411A (en) * | 2015-01-14 | 2015-05-06 | 惠州华阳通用电子有限公司 | LED brightness and chroma consistency adjusting device and method |
| CN114429761A (en) * | 2022-04-01 | 2022-05-03 | 南京有物信息科技有限公司 | Display control method, device and system suitable for multiple terminals |
-
2015
- 2015-01-14 CN CN201520025221.4U patent/CN204392641U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104602411A (en) * | 2015-01-14 | 2015-05-06 | 惠州华阳通用电子有限公司 | LED brightness and chroma consistency adjusting device and method |
| CN114429761A (en) * | 2022-04-01 | 2022-05-03 | 南京有物信息科技有限公司 | Display control method, device and system suitable for multiple terminals |
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