CN109922565A - Keep light emitting diode blend color consistency system - Google Patents
Keep light emitting diode blend color consistency system Download PDFInfo
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Abstract
The present invention relates to light emitting diode blend color consistency system is kept, including integrated circuit, LED driving circuit, light emitting diode lamp circuit board, two or more different photochromic light emitting diodes and thermistor；The output circuit of the integrated circuit control connects with LED driving circuit access circuit；The LED driving circuit output circuit connects with the access circuit of light emitting diode lamp circuit board；The photochromic light emitting diode of the difference is located on light emitting diode lamp circuit board, is connect on light emitting diode lamp circuit board output circuit route；The thermistor is located on light emitting diode lamp circuit board, for detect light emitting diode lamp circuit board or with the temperature on light emitting diode, set communicating route between the thermistor and integrated circuit, the communicating route formed thermistor feedback loop.The present invention makes different photochromic light emitting diodes, and color change is maintained at certain range at different temperatures, effectively improves the application effect of light emitting diode.
Description
Technical field
The invention belongs to light emitting diode (Light Emitting Diode, LED) to mix technology of mix colors field, specifically relate to
And a kind of control LED color color mixing algorithm system and method.
Background technique
Light emitting diode is semiconductor product, so light emitting diode can generate heat, and itself temperature during the work time
Degree can be incremented by with the working time, and semiconductor is at different temperatures, characteristic can difference, which results in light-emitting diodes
Characteristic has offset situation to pipe at different temperatures.In general light emitting diode is in the improving luminous efficiency with temperature
Can weaken, and at the different photochromic same temperature of light emitting diode luminous efficiency decaying it is also different, which results in, with
The promotion of temperature, the composition ratio of blend color can change, so as to cause photochromic variation is combined.
Summary of the invention
The object of the present invention is in order to solve the different photochromic combinations at different temperatures of the light emitting diode of the prior art
The inconsistent problem of color change, provides that handle the consistent holding light emitting diode of each photochromic color keep at various temperatures mixed
Close colour consistency system.
Keep light emitting diode blend color consistency system, including integrated circuit, LED driving circuit, shine
Diode lights circuit board, two or more different photochromic light emitting diodes and thermistor；The output of the integrated circuit control
Circuit connects with LED driving circuit access circuit；The LED driving circuit output circuit and light-emitting diodes
The access circuit of lamp circuit plate connects；The photochromic light emitting diode of the difference is located on light emitting diode lamp circuit board, is connect
On light emitting diode lamp circuit board output circuit route；The thermistor is located on light emitting diode lamp circuit board, is used for
The temperature on light emitting diode lamp circuit board or/and light emitting diode is detected, sets and communicates between the thermistor and integrated circuit
Route, the communicating route form the feedback loop of thermistor；The thermistor is by light emitting diode lamp circuit board or/and hair
For the temperature information of light emitting diode on optical diode lamp circuit board by feedback loop to integrated circuit, integrated circuit is logical
The electric current of the whole LED driving circuit of toning carries out the brightness of power compensation control light emitting diode, realizes control luminous two
The offset of pole pipe color, stable color temperature.
Further, the integrated circuit is equipped with DMX512 communication access end, pwm circuit control output end and feedback data
Incoming end；The LED driving circuit is equipped with pwm circuit control signal and current output terminal；The light emitting diode
Lamp circuit board is equipped with current input terminal and temperature feedback output end；The DMX512 communication access end and outside of the integrated circuit
DMX512 communication line connects, for receiving external DMX512 communication data；Integrated circuit pwm circuit control output end (with
The pwm circuit control signal of LED driving circuit is connected to each other, for adjusting the input of LED driving circuit
Voltage makes the amplitude of input voltage be converted into the certain pulse of width；The feedback data incoming end and light-emitting diodes of integrated circuit
The temperature feedback output end of lamp circuit plate is connected to each other, and forms the communicating route of feedback loop；The light emitting diode driving electricity
The current output terminal on road and the current input terminal of light emitting diode lamp circuit board are connected to each other, and are supplied by light emitting diode lamp circuit board
Supply electricity to light emitting diode.
Further, keeping the control method of light emitting diode blend color consistency system is:
1) the integrated circuit output dimming PWM circuits control data, and the LED driving circuit driving shines
Light emitting diode acting on diode lights circuit board, lights light emitting diode；
2) when light emitting diode does work, the light emitting diode lamp circuit board or/and luminous two are detected by thermistor
Pole pipe temperature is simultaneously fed back to the integrated circuit；
3) integrated circuit detects light emitting diode lamp circuit board or/and luminous two by receiving thermistor feedback
The temperature data of pole pipe calculates light emitting diode offset using algorithm；
4) integrated circuit judges that light emitting diode needs gain compensation still to successively decrease benefit according to calculated offset
Carry out power compensation is repaid, and is made adjustment to pwm circuit control data；
5) LED driving circuit shines according to the pwm circuit control data output electric current adjustment made adjustment
Diode power makes light emitting diode in temperature color under different conditions to adjust each light emitting diode different colours ratio
Holding ratio is consistent, reaches and light emitting diode is kept to mix photochromic consistency.
Further, the power compensation algorithm calculating is: after integrated circuit is collected into temperature information, obtaining luminous two
Pole pipe attenuation ratio data inquire the attenuation ratio W of various LED colors；With attenuation ratio maximum one luminous two
Pole pipe is benchmark color, attenuation ratio w, then the attenuation ratio difference lw of the attenuation ratio of each LED color and primary colours
For
Lw=W-w
The current maximum brightness v for judging each LED color, with the attainable maximum of each LED color institute
Brightness V；The difference of maximum brightness V and current maximum brightness v are lv, then
Lv=V-v
Using the compensation attenuation ratio lw and current maximum brightness v of each LED color it can be concluded that specific offset
C, formula are as follows:
C=lw*v；
Compare maximum difference in luminance lv and specific offset C, when lv is greater than C, then algorithm is upward penalty method；When lv be less than C,
Then algorithm is downward penalty method；
Upward penalty method is that current color driving value is added specific offset, and formula is as follows:
v+(v*W)
Obtain the value that the last color needs to drive；
Downward penalty method is that current color driving value is subtracted specific offset, and formula is as follows:
v–C
Obtain the value that the last color needs to drive.
The present invention has substantive distinguishing features and significant progress following prominent:
Present invention employs the modes of power compensation to adjust different temperatures, different photochromic each light emitting diodes
It is whole, accurately obtain first photochromic each light emitting diode lumen, power, electric current, colour temperature and place lumen, power, electric current and
Then the relationship of the corresponding XY coordinate of colour temperature carries out power compensation to different situations using each relationship, so that each shine
The different photochromic ratios of diode are maintained in original level, and too big variation will not occur for the color after combination, make difference
Color change is maintained at certain range to photochromic light emitting diode at different temperatures, effectively improves answering for light emitting diode
Use effect.
Detailed description of the invention
Fig. 1 is the amber 25-50 ° of light intensity decays ratio of the embodiment of the present invention.
Fig. 2 is 25-50 ° of light intensity decays ratio of white of the embodiment of the present invention.
Fig. 3 is 25-50 ° of light intensity decays ratio of red of the embodiment of the present invention.
Fig. 4 is 25-50 ° of light intensity decays ratio of green of the embodiment of the present invention.
Fig. 5 is the schematic diagram of the embodiment of the present invention.
Fig. 6 is the downward compensation result data drawing list of the embodiment of the present invention.
Fig. 7 is the upward compensation result data drawing list of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail.
Holding light emitting diode blend color consistency system as shown in Figure 5, including integrated circuit 1, light emitting diode
Driving circuit 2, light emitting diode lamp circuit board 3, two or more different photochromic light emitting diodes 4 and thermistor 5；The collection
The output circuit controlled at circuit 1 accesses circuit with LED driving circuit 2 and connects；The LED driving circuit
2 output circuits connect with the access circuit of light emitting diode lamp circuit board 2；The photochromic light emitting diode 4 of the difference is located at hair
On optical diode lamp circuit board 3, connect on 3 output circuit route of light emitting diode lamp circuit board；The thermistor 5 is located at hair
On optical diode lamp circuit board 3, for detecting the temperature on light emitting diode lamp circuit board 3 or/and light emitting diode 4, the heat
Communicating route is set between quick resistance 5 and integrated circuit 1, which forms the feedback loop 6 of thermistor 5；The temperature-sensitive
Resistance 5 leads to the temperature information of the light emitting diode 4 on light emitting diode lamp circuit board 3 or/and light emitting diode lamp circuit board 3
It crosses feedback loop 6 to feed back to integrated circuit 1, integrated circuit 1 carries out function by adjusting the electric current of LED driving circuit 2
Rate compensation way controls the brightness of light emitting diode 4, realizes offset, the stable color temperature of control 4 color of light emitting diode.
In embodiment, the integrated circuit 1 is equipped with DMX512 communication access end 11, pwm circuit control output end 12 and anti-
Present data access end 13；The LED driving circuit 2 is equipped with pwm circuit control signal 21 and current output terminal 22；
The light emitting diode lamp circuit board 3 is equipped with current input terminal 31 and temperature feedback output end 32；The integrated circuit 1
DMX512 communication access end 11 connects with outside DMX512 communication line, for receiving external DMX512 communication data；Integrated electricity
The pwm circuit control output end 12 on road 1 is connected to each other with the pwm circuit control signal 21 of LED driving circuit 2, is used for
The input voltage for adjusting LED driving circuit 2, makes the amplitude of input voltage be converted into the certain pulse of width；Integrated electricity
The feedback data incoming end 13 on road 1 is connected to each other with the temperature feedback output end 32 of light emitting diode lamp circuit board 3, and formation is fed back to
The communicating route on road 6；The current output terminal 22 of the LED driving circuit 2 and the electricity of light emitting diode lamp circuit board 3
Stream input terminal 31 is connected to each other, and supplies electricity to light emitting diode 4 by light emitting diode lamp circuit board 3, above-mentioned each element or component
It docks or connects and refer to conventional use power circuit or data circuit interconnection, it is same as below.
The control method of above-mentioned holding light emitting diode blend color consistency system is:
1) integrated circuit 1 exports dimming PWM circuits and controls data, the driving of LED driving circuit 2 hair
Light emitting diode 4 on optical diode lamp circuit board 3 does work, and lights light emitting diode 4；
2) when light emitting diode 4 does work, the light emitting diode lamp circuit board 3 is detected by thermistor 5 or/and is shone
4 temperature of diode is simultaneously fed back to the integrated circuit 1；
3) integrated circuit 1 detects light emitting diode lamp circuit board 3 or/and hair by receiving the feedback of thermistor 5
The temperature data of optical diode 4 calculates light emitting diode offset using algorithm；
4) integrated circuit 1 judges that light emitting diode 4 needs gain compensation still to successively decrease according to calculated offset
Compensation carries out power compensation, and makes adjustment to pwm circuit control data；
5) LED driving circuit 2 is according to the pwm circuit control data output electric current adjustment hair made adjustment
4 power of optical diode, to adjust each 4 different colours ratio of light emitting diode, make light emitting diode 4 temperature under different conditions
Color keep ratio is consistent, reaches and light emitting diode is kept to mix photochromic consistency.
Further, the power compensation mode is: the light emitting diode analyzes red, blue, amber by data
Color and white, wherein it is amber the most serious with temperature raising light intensity decays, with amber for benchmark color,
When the maximum dimmer value of base colors subtracts the light modulation value of current base color, the difference obtained is minimum to be less than benchmark face
When the pad value of color, base colors pad value subtracts the pad value of other colors of light emitting diode, obtain light emitting diode other
The respective attenuation compensation value of color, other colors of light emitting diode respectively subtract attenuation compensation value and make various light emitting diode face
The luminous intensity of color is maintained in original ratio, so that blend color is unlikely to change；
Conversely, when the maximum dimmer value of base colors subtracts the light modulation value of current base color, the poor minimum obtained is greater than
When the pad value of base colors, base colors pad value subtracts the pad value of other colors of light emitting diode, obtains light-emitting diodes
The respective attenuation compensation value of other colors is managed, other colors of light emitting diode respectively add attenuation compensation value and make various luminous two
The luminous intensity of pole pipe color is maintained in original ratio, so that blend color is unlikely to change.This compensation way has
It is compensated using on the basis of not reducing light emission luminance, the intensity of light is constant, and color is constant, is relatively good compensation side
Formula.
Above-mentioned power compensation algorithm calculating is specifically: after integrated circuit 1 is collected into temperature information, obtaining light emitting diode
4 attenuation ratio data inquire the attenuation ratio W of each 4 color of light emitting diode；With the maximum light emitting diode of attenuation ratio
4 be benchmark color, attenuation ratio w, then the attenuation ratio difference lw of the attenuation ratio of 4 color of various light emitting diodes and primary colours
For
Lw=W-w
The current maximum brightness v for judging each 4 color of light emitting diode, it is attainable most with each 4 color of light emitting diode institute
Big brightness V；The difference of maximum brightness V and current maximum brightness v are lv, then
Lv=V-v
Using the compensation attenuation ratio lw and current maximum brightness v of each 4 color of light emitting diode it can be concluded that specific compensation
Value C, formula are as follows:
C=lw*v；
Compare maximum difference in luminance lv and specific offset C, when lv is greater than C, then algorithm is upward penalty method；When lv be less than C,
Then algorithm is downward penalty method；
Upward penalty method is that current color driving value is added specific offset, and formula is as follows:
v+(v*W)
Obtain the value that the last color needs to drive；
Downward penalty method is that current color driving value is subtracted specific offset, and formula is as follows:
v–C
Obtain the value that the last color needs to drive.
It include a large amount of light emitting diode data in the algorithm, these data sources are in producer or pass through precision optics instrument
Device detects to obtain, it can be concluded that the relation formula of electric current and light-emitting diode luminance, recycles and close after obtaining these data
It is formula adjustment electric current.Temperature signal is converted to actual temp value through algorithm calculating by the integrated circuit 1, utilizes Fig. 1 to Fig. 4
In list data find out the ratio value that corresponding temperature is decayed.
The each color attenuation ratio value of light emitting diode is recorded, base colors attenuation ratio value is compared, each color declines
Subtract ratio value W, the difference with base colors attenuation ratio value w is the attenuation ratio for needing to compensate, and is replaced here with lw, lw=W-w.
The current maximum brightness v for judging light emitting diode various colors, with the attainable maximum brightness V of various colors institute；
The difference of maximum brightness V and current maximum brightness v are lv, then lv=V-v；
Using the compensation attenuation ratio lw and current maximum brightness v of each color of light emitting diode it can be concluded that specific offset
C, C=lw*v；
Compare maximum difference in luminance lv and specific offset C, when lv is greater than C, then algorithm is upward penalty method；When lv be less than C,
Then algorithm is downward penalty method.
Upward penalty method is current color driving value to be added specific offset, and v+ (v*W) obtains the last color needs
The value of driving, upward penalty method advantage are the intensity of light will not to be lost in compensation process, and can reach the consistency of temperature color
Purpose.
Downward penalty method is current color driving value to be subtracted specific offset, v-C, show that the last color needs to drive
Value.The advantages of downward penalty method, is in the raised electric current for reducing output in the process of temperature, it is suppressed that the promotion of temperature, again
It can achieve the purpose that the consistency of temperature color.
Compensated number is sent by the PWM output interface on control integrated circuit 1 after data processing after offset
According to the brightness of adjustment light emitting diode 4 achievees the purpose that keep light emitting diode blend color consistency.
Fig. 6 and Fig. 7 table shows the result data of different compensation ways, and the spectrum after compensation is clearly demonstrated that in figure
XY coordinate and colour temperature be not all than having balanced stabilization, thus, it could be seen that this power method of repaying can keep light emitting diode blend color
The feasible and validity of consistency system.
The embodiment of the present invention can only represent the spy of one of light emitting diode (Light Emitting Diode, LED)
Property, not represent uniqueness of the invention.It will be apparent to those skilled in the art that can technical solution as described above and
Various other corresponding changes and deformation are made in design, and all these change and deformation all should belong to the present invention
Within scope of protection of the claims.
Claims (4)
1. keeping light emitting diode blend color consistency system, it is characterised in that: including integrated circuit (1), light emitting diode
Driving circuit (2), light emitting diode lamp circuit board (3), two or more different photochromic light emitting diodes (4) and thermistor
(5)；
The output circuit of integrated circuit (1) control connects with LED driving circuit (2) access circuit；
LED driving circuit (2) output circuit connects with the access circuit of light emitting diode lamp circuit board (2)；
The photochromic light emitting diode (4) of the difference is located on light emitting diode lamp circuit board (3), is connect in LED light lamp electricity
On road plate (3) output circuit route；
The thermistor (5) is located on light emitting diode lamp circuit board (3), for detecting light emitting diode lamp circuit board (3)
Or/and the temperature on light emitting diode (4), communicating route is set between the thermistor (5) and integrated circuit (1), the communication lines
Line forms the feedback loop (6) of thermistor (5)；
The thermistor (5) will be luminous on light emitting diode lamp circuit board (3) or/and light emitting diode lamp circuit board (3)
The temperature information of diode (4) is fed back to integrated circuit (1) by feedback loop (6), and integrated circuit (1) is by adjusting luminous two
The electric current of pole pipe driving circuit (2) carries out the brightness of power compensation control light emitting diode (4).
2. holding light emitting diode blend color consistency system according to claim 1, it is characterised in that:
The integrated circuit (1) is equipped with DMX512 communication access end (11), pwm circuit control output end (12) and feedback data and connects
Enter end (13)；
The LED driving circuit (2) is equipped with pwm circuit control signal (21) and current output terminal (22)；
The light emitting diode lamp circuit board (3) is equipped with current input terminal (31) and temperature feedback output end (32)；It is described integrated
The DMX512 communication access end (11) of circuit (1) connects with outside DMX512 communication line；The pwm circuit control of integrated circuit (1)
Output end (12) processed and the pwm circuit control signal (21) of LED driving circuit (2) are connected to each other；Integrated circuit (1)
Feedback data incoming end (13) and the temperature feedback output end (32) of light emitting diode lamp circuit board (3) be connected to each other, formed anti-
It is fed back to the communicating route of road (6)；Current output terminal (22) and the LED light lamp electricity of the LED driving circuit (2)
The current input terminal (31) of road plate (3) is connected to each other, and supplies electricity to light emitting diode (4) by light emitting diode lamp circuit board (3).
3. holding light emitting diode blend color consistency system according to claim 1 or 2, it is characterised in that: system
Control method be:
1) the integrated circuit output dimming PWM circuits control data, and the LED driving circuit drives light-emitting diodes
Light emitting diode acting on lamp circuit plate；
2) when light emitting diode does work, the light emitting diode lamp circuit board or/and light emitting diode are detected by thermistor
Temperature is simultaneously fed back to the integrated circuit；
3) integrated circuit detects light emitting diode lamp circuit board or/and light emitting diode by receiving thermistor feedback
Temperature data, calculate light emitting diode offset using algorithm；
4) integrated circuit according to calculated offset judge light emitting diode need gain compensation still successively decrease compensate into
Row power compensation, and make adjustment to pwm circuit control data；
5) LED driving circuit is according to the pwm circuit control data output electric current adjustment light-emitting diodes made adjustment
Tube power makes light emitting diode in temperature color keep under different conditions to adjust each light emitting diode different colours ratio
Ratio is consistent, reaches and light emitting diode is kept to mix photochromic consistency.
4. holding light emitting diode blend color consistency system according to claim 3, it is characterised in that: the power
Backoff algorithm calculating is: after integrated circuit is collected into temperature information, obtaining light emitting diode attenuation ratio data, inquires various
The attenuation ratio W of LED color；Using the maximum light emitting diode of attenuation ratio as benchmark color, attenuation ratio is
W, then the attenuation ratio difference lw of the attenuation ratio of each LED color and primary colours is
Lw=W-w
The current maximum brightness v for judging each LED color, institute is attainable most light with each light emitting diode (4) color
Spend V；The difference of maximum brightness V and current maximum brightness v are lv, then
Lv=V-v
Using the compensation attenuation ratio lw and current maximum brightness v of each LED color it can be concluded that specific offset C, public
Formula is as follows:
C=lw*v；
Compare maximum difference in luminance lv and specific offset C, when lv is greater than C, then algorithm is upward penalty method；When lv be less than C, then calculate
Method is downward penalty method；
Upward penalty method is that current color driving value is added specific offset, and formula is as follows:
v+(v*W)
Obtain the value that the last color needs to drive；
Downward penalty method is that current color driving value is subtracted specific offset, and formula is as follows:
v–C
Obtain the value that the last color needs to drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153074.1A CN109922565A (en) | 2019-02-28 | 2019-02-28 | Keep light emitting diode blend color consistency system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153074.1A CN109922565A (en) | 2019-02-28 | 2019-02-28 | Keep light emitting diode blend color consistency system |
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| Publication Number | Publication Date |
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| CN109922565A true CN109922565A (en) | 2019-06-21 |
Family
ID=66962774
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| CN201910153074.1A Pending CN109922565A (en) | 2019-02-28 | 2019-02-28 | Keep light emitting diode blend color consistency system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716378A (en) * | 2019-09-30 | 2020-01-21 | 歌尔股份有限公司 | Data burning method and device for light emitting diode, projector and storage medium |
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2019
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