CN110621105B - Temperature color drift real-time correction device and method for LED multi-primary-color lamp - Google Patents
Temperature color drift real-time correction device and method for LED multi-primary-color lamp Download PDFInfo
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Abstract
The device comprises a computer, a temperature sensor and a bright color measuring instrument, and the LED multi-primary color lamp is provided with a control unit comprising a color management operation unit. The method comprises the steps of 1) actually measuring original data of a temperature curve of the lamp; 2) constructing a dynamic polynomial fitting function, and sending the dynamic polynomial fitting function to a color management operation unit for storage; 3) and obtaining bright color data comprising color coordinates (x, Y) and a brightness value Y at different temperatures, and correcting temperature color drift data in real time. The method has the practicability of applying large-scale mass production, and lamp-by-lamp measurement on a production line is not needed. The color drift of temperature caused by temperature change can be greatly improved or even eliminated for various light color outputs including color output, color temperature output and color coordinate output of a full color gamut, and the color drift of white light and various mixed light under different temperatures can be avoided. The method has the advantages of simple operation, efficient process, reliable data and good temperature color drift correction effect.
Description
Technical Field
The invention relates to an LED multi-primary-color lamp, in particular to a real-time temperature color drift correction device and method for the LED multi-primary-color lamp.
Background
A multi-primary Light Emitting Diode (LED) lamp with at least three primary colors is widely used in the fields of architectural lighting, professional lighting, art lighting, and the like. Due to the sensitivity of the LED to the operating temperature, the light emitting intensity, dominant wavelength and color coordinates of the LED will change with the temperature, and the output of the power supply and the driving chip will also change with the temperature. These factors cause the light color output of the LED multi-primary light fixture to deviate from the nominal value to different degrees due to different ambient and operating temperatures. When the LED multi-primary-color lamp emits light in a multi-primary-color mixture, for example, when white light with a specified color temperature is output, because the temperature and color drift and the brightness change characteristic of LEDs with different primary colors are different, the problem that the light color output deviates from the nominal value to different degrees due to the difference between the ambient temperature and the operating temperature is particularly serious. Due to the fact that the LED is large in distribution discreteness of bright color data, the method is suitable for absolute value temperature correction of a certain LED multi-primary-color lamp and even cannot be suitable for other LED multi-primary-color lamps in the same batch. Most of the existing temperature color drift correction methods use a conventional chromaticity measuring instrument, in the early research and development process, each primary color matching data at different temperatures is manually searched for a small number of color coordinate points or color temperature points, and the primary color matching data is stored in a control unit of an LED multi-primary color lamp for calling, so that the operation is inconvenient, the real-time performance is poor, the efficiency is low, the experience of operators is relied on, and the color drift correction effect is not guaranteed. Moreover, temperature color drift correction can be only performed on a small number of preset color temperature points or standard color coordinates, and the method cannot be applied to the whole color space of the LED multi-primary-color lamp. The use of the pre-measured and set primary color proportioning data at different temperatures is only suitable for the condition that the color coordinates and the brightness of each primary color are consistent, and even if the brightness and the color coordinates of the LED multi-primary-color lamps in the same batch are different, the light color accuracy of different LED multi-primary-color lamps cannot be ensured, and the consistency cannot be ensured. Some packaging manufacturers try to correct temperature color drift by using temperature curves comprising color coordinates, temperature and brightness, and aiming at the junction temperature of the chip under a certain specific working current condition, because the working current difference of the LED multi-primary-color lamp chip is large, the junction temperature data of the chip in daily work can not be monitored actually, and the temperature data has no direct relation with the temperature data of the monitored aluminum substrate of the LED light-emitting unit of the LED multi-primary-color lamp. Therefore, the temperature curve given to the chip junction temperature can only be used for qualitative reference and cannot be used for real-time quantitative temperature color drift data correction.
Disclosure of Invention
The invention aims to solve the technical problem of making up the defects of the prior art and provides a real-time temperature and color drift correction device of an LED multi-primary-color lamp.
Another technical problem to be solved by the present invention is to make up for the above-mentioned defects of the prior art, and to provide a method for correcting temperature and color drift of an LED multi-primary color lamp in real time.
The technical problem of the device for correcting the temperature and color drift of the LED multi-primary-color lamp in real time is solved by the following technical scheme.
The temperature color drift real-time correction device of the LED multi-primary-color lamp comprises a computer connected with the LED multi-primary-color lamp, at least one temperature sensor arranged on an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp, and a brightness measuring instrument respectively connected with the LED multi-primary-color lamp and the computer, wherein the temperature sensor acquires current temperature data of the aluminum substrate of the LED multi-primary-color lamp in real time, the LED multi-primary-color lamp is provided with a control unit comprising a color management operation unit, the color management operation unit is embedded algorithm software, the color management operation unit stores original brightness data comprising color coordinates (x, Y) and a brightness value Y actually measured at a certain time and a certain working temperature of each primary color of the LED multi-primary-color lamp, and a temperature value, and the received original brightness data and the temperature value are subjected to received real-time through an embedded chromaticity operation algorithm, The color temperature or color coordinate control instruction is used for calculating and outputting each primary color matching data of the LED multi-primary color lamp; and a polynomial fitting function of temperature curves comprising color coordinates-temperature and brightness-temperature, which are influenced by the LED multi-primary-color lamp to the output brightness of each primary color, is also stored, and the original brightness data of each primary color are subjected to real-time temperature correction.
The device for correcting the temperature and color drift of the LED multi-primary-color lamp in real time is characterized in that:
the computer is a computer provided with temperature bright-color drift curve measurement software, the temperature bright-color drift curve measurement software is VU lamp light color gray scale curve measurement and calibration software (VU Gamma Yoda _ L for short) V4.0 version, and the VU lamp light color gray scale curve measurement and calibration software (VU Gamma Yoda _ L for short) V1.2 version of Chinese computer software copyright registration number: 2018SR16994, the temperature bright color drift curve measurement software provides a human-computer interaction interface, real-time display is carried out on the interface on the temperature of the LED multi-primary color lamp, measured data of each primary color, a temperature bright color drift curve drawn according to the measured data, a dynamic polynomial fitting function is constructed according to the measured data after the bright color data are collected, and a coefficient group of the polynomial function is sent to a color management operation unit in the LED multi-primary color lamp control unit.
The technical problem of the device for correcting the temperature and color drift of the LED multi-primary-color lamp in real time is solved by the following further technical scheme.
The computer is connected with the LED multi-primary-color lamp through one of a USB (universal serial bus) to DMX/RDM (digital multimedia broadcasting) bidirectional communication module connection through a USB interface of the computer, a wired network port of the computer through a corresponding network adapter, a wireless network card of the computer through a corresponding network adapter, a Bluetooth communication module of the computer and an infrared communication module of the computer, and controls the lighting state of the LED multi-primary-color lamp and monitors the temperature of an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp in real time.
The computer is connected with the brightness measuring instrument through one of USB interface connection of the computer, wired network port of the computer through a corresponding network adapter, wireless network card of the computer through a corresponding network adapter, Bluetooth communication module connection of the computer and infrared communication module connection of the computer, the brightness measuring instrument is controlled by temperature brightness drift curve measuring software of the computer to measure current brightness data of each primary color of the LED multi-primary-color lamp at different temperatures, wherein the current brightness data comprises color coordinates (x, Y) and a brightness value Y, and the brightness data is one of luminous flux, illumination of an irradiated surface and brightness of the irradiated surface.
The technical problem of the method for correcting the temperature and color drift of the LED multi-primary-color lamp in real time is solved by the following technical scheme.
The real-time correction method for the temperature color drift of the LED multi-primary-color lamp adopts the real-time correction device for the temperature color drift, and comprises the preparation steps before correction: and connecting the bright color measuring instrument with the corrected LED multi-primary color lamp, respectively connecting temperature bright color drift curve measuring software with the corrected LED multi-primary color lamp and the bright color measuring instrument, and setting a temperature measuring interval delta T.
The method for correcting the temperature color drift of the LED multi-primary-color lamp in real time is characterized by comprising the following steps:
further comprising the steps of:
1) actually measuring temperature curve original data of the LED multi-primary color lamp, wherein the temperature curve original data comprises color coordinates-temperature and brightness-temperature;
2) constructing a dynamic polynomial fitting function from the original data measured in the step 1), sending a coefficient group of the generated dynamic polynomial fitting function to a color management operation unit of a control unit of the LED multi-primary-color lamp for checking and correcting effects in a research and development stage, storing the coefficient group into a temperature drift file, and sending the temperature drift file to the color management operation unit of the control unit of the LED multi-primary-color lamp in the same batch in a production line correction link;
3) the color management operation unit of the LED multi-primary-color lamp obtains the brightness data comprising color coordinates (x, Y) and a brightness value Y at different temperatures through function operation by using an existing internal temperature curve function, original brightness data and temperature comprising color coordinates and brightness values stored during production line correction and the real-time temperature of the current LED multi-primary-color lamp, and corrects the temperature color drift data in real time.
The technical problem of the method for correcting the temperature and color drift of the LED multi-primary-color lamp in real time is solved by the following further technical scheme.
The measurement of the raw data in the step 1) comprises the following sub-steps:
1.1) the software for measuring the temperature, brightness and drift curve regularly uses the standard RDM protocol instruction to monitor the current temperature value t on the aluminum substrate of the LED luminous unit of the LED multi-primary-color lamp_current；
1 and 2) cooling the current temperature on an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp to a lower limit t of the working temperature0Starting temperature curve original data comprising color coordinates-temperature and brightness-temperature of the actually measured LED multi-primary-color lamp on a temperature bright color drift curve measuring software interface;
1.3) respectively and independently lighting all n primary colors C of the LED multi-primary-color lamp in sequence under the control of a computernAnd respectively controlling a brightness measuring instrument to measure original brightness data (x, Y; Y) of each primary color comprising color coordinates (x, Y) and a brightness value Y: (C)i_x_t0，Ci_y_t0；Ci_Y_t0) And respectively recording the ith primary color C of the LED multi-primary-color lampiCurrent temperature t of aluminum substrate of LED light-emitting unit during primary color measurement0_CiWherein i is 1 to n;
1.4) multiple bases of LEDThe color lamps are lighted up and heated up at the same time with the highest brightness, the temperature is monitored by the temperature bright color drift curve measuring software, and when the temperature reaches t1＝t0+ Δ T, starting the second round of measurement, repeating steps 1 and 3), and respectively controlling the bright color measuring instrument to measure the original bright color data (x, Y; y): (C)i_x_t1，Ci_y_t1；Ci_Y_t1) And recording the measurement of the ith primary CiCurrent temperature t of1_CiWherein i is 1 to n;
1.5) repeating substeps 1.4) until the temperature rises to the upper limit of the temperature range, yielding m ═ (t)max-tmin) The/Δ T +1 group includes original luminance data groups of color coordinates (x, Y) and luminance values Y, and the original luminance data groups of the m groups include original luminance data (x, Y; y).
The step 2) of constructing a dynamic polynomial fitting function, sending the coefficient group of the dynamic polynomial function to a color management operation unit of a control unit of the LED multi-primary-color lamp for checking and correcting effects in a research and development stage, storing the coefficient group into a temperature drift file, and sending the temperature drift file to the color management operation unit of the control unit of the LED multi-primary-color lamp in the same batch in a production line correction link, wherein the method comprises the following steps:
2.1) converting the first primary color C1The raw color data for m sets at different temperatures are arranged in the following form:
(t0_C1，C1_x_t0)，(t1_C1，C1_x_t1)……(tm_C1，C1_x_tm)；
(t0_C1，C1_y_t0)，(t1_C1，C1_y_t1)……(tm_C1，C1_y_tm)；
(t0_C1，C1_Y_t0)，(t1_C1，C1_Y_t1)……(tm_C1，C1_Y_tm)；
and respectively carrying out polynomial fitting to obtain the following coefficient groups of the three groups of dynamic polynomial functions:
(a0_C1_x，a1_C1_x……aj_C1x); wherein j is the polynomial degree;
(a0_C1_y，a1_C1_y……ak_C1y); wherein k is a polynomial degree;
(a0_C1_Y，a1_C1_Y……al_C1y); wherein l is the polynomial degree;
the first primary color C1The CIE _ x coordinate of (a) is expressed as a function of temperature as an independent variable:
C1_x(t)＝a0_C1_x+a1_C1_x×t+a2_C1_x×t2+……；
C1_y(t)＝a0_C1_y+a1_C1_y×t+a2_C1_y×t2+……；
C1_Y(t)＝a0_C1_Y+a1_C1_Y×t+a2_C1_Y×t2+……；
the degree of polynomial fitting is preferably selected from 1-5 times based on the principle that the error of the fitting result is minimum;
2.2) repeating the substeps 2.1) to obtain the coefficient group of the dynamic polynomial function of all the n primary color original bright color data with the temperature as an independent variable:
Ci_x(t)，Ci_y(t)；Ciy (t); wherein i is 1 to n;
2 and 3) sending the dynamic polynomial function coefficient group in the n function groups obtained in the step 2 and 2) to a color management operation unit of a control unit of the LED multi-primary-color lamp for storage.
The step 3) obtains the bright color data comprising color coordinates (x, Y) and a brightness value Y at different temperatures through function operation, and corrects the temperature color drift data in real time, and the method comprises the following steps:
3.1) for a specific LED multi-primary-color lamp, respectively measuring all n primary colors CnColor coordinates (x, Y) and luminance values Y when lit individually at the same gray level, and recording all n primary colors CnTemperature point t at the time of respective measurementcal_CiTo obtain tcal_CiAll n primary colors C at temperaturenBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcal，Ci_y_tcal；Ci_Y_tcalwherein i is 1 to n;
3.2) mixing of above tcalAll n primary colors C at Ci temperaturenThe bright color data comprising color coordinates (x, Y) and a brightness value Y are sent to a color management operation unit of the LED multi-primary-color lamp for storage;
3.3) in daily work of the LED multi-primary-color lamp, the color management arithmetic unit acquires the current temperature data t on the aluminum substrate of the LED light-emitting unit in real timecurrentCalculating the current temperature point t by using the following formulacurrentAll n primary colors C after temperature correctionnBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcurrent＝Ci_x_tcal+[Ci_x(tcurrent)-Ci_x(tcal_Ci)]；
Ci_y_tcurrent＝Ci_y_tcal+[Ci_y(tcurrent)-Ci_y(tcal_Ci)]；
Ci_Y_tcurrent＝Ci_Y_tcal×[Ci_Y(tcurrent)/Ci_Y(tcal_Ci)]；
wherein i is 1 to n;
3.4) correcting the temperature of the substep 3.3) to obtain all n primary colors CnSubstituting the bright color data comprising color coordinates (x, Y) and brightness value Y into the subsequent color management operation, and correcting in real time from the data sourceThe temperature color drift is greatly improved and reduced.
Compared with the prior art, the invention has the beneficial effects that:
the method of the invention has the advantages that the measurement process of the original data of the color coordinate-temperature curve and the brightness-temperature curve of each primary color is fully automatic, and manual intervention and recording are not needed. The relative difference of the color coordinates at different temperatures and the relative proportion of the brightness value are obtained through function operation and are used for correcting the temperature color drift in real time, and the same group of temperature curves can be used in the same batch. Particularly, the method has the practicability of large-scale mass production, and the time-consuming temperature curve measurement is completed in the sample lamp research and development stage without lamp-by-lamp measurement in a production line. The color output of various forms including color output, color temperature output and color coordinate output in a full color gamut can be greatly improved or even eliminated, and the color drift of white light and various mixed light at different temperatures is avoided. The method has the advantages of simple operation, efficient process, reliable data and good temperature color drift correction effect.
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FIG. 1 is a block diagram of the components of an embodiment of the present invention.
Detailed Description
The present invention will be described with reference to the following embodiments and drawings.
A real-time correction device for temperature and color drift of an LED multi-primary color lamp shown in figure 1 comprises a computer 2 which is connected with the LED multi-primary color lamp 1 and is provided with temperature and brightness drift curve measurement software, a temperature sensor 3 which is arranged on an aluminum substrate of an LED light-emitting unit of the LED multi-primary color lamp 1, and a brightness measuring instrument 4 which is respectively connected with the LED multi-primary color lamp 1 and the computer 2 provided with the temperature and brightness drift curve measurement software, wherein the temperature sensor 3 acquires the current temperature data of the aluminum substrate of the LED multi-primary color lamp 1 in real time, the LED multi-primary color lamp 1 is provided with a control unit comprising a color management operation unit which is embedded algorithm software, the color management operation unit stores the original brightness data comprising color coordinates (x, Y) and brightness value Y which are actually measured at a certain time and a certain working temperature of each primary color of the LED multi-primary color lamp 1, the temperature value is used for calculating and outputting the primary color matching data of the LED multi-primary-color lamp 1 according to the received color, color temperature or color coordinate control instruction through an embedded chromaticity operation algorithm; and a polynomial fitting function of a temperature curve comprising color coordinates-temperature and brightness-temperature, which influences the output brightness of each primary color by the LED multi-primary-color lamp 1, is also stored, and the original brightness data of each primary color are subjected to real-time temperature correction.
The temperature brightness drift curve measurement software is a Chinese computer software copyright registration number of VU light color gray scale curve measurement and calibration software (VU Gamma Yoda _ L for short) V4.0 version, and the VU light color gray scale curve measurement and calibration software (VU Gamma Yoda _ L for short) V1.2 version: 2018SR16994, the temperature bright color drift curve measurement software provides a human-computer interaction interface, the temperature of the LED multi-primary color lamp 1, measured data of each primary color and a temperature bright color drift curve drawn according to the measured data are displayed on the interface in real time, a dynamic polynomial fitting function is constructed according to the measured data after the bright color data are collected, and a coefficient group of the polynomial function is sent to a color management operation unit in the control unit of the LED multi-primary color lamp 1.
The computer 2 provided with the temperature bright color drift curve measurement software is connected with the LED multi-primary-color lamp 1 through a USB-to-DMX/RDM bidirectional communication module 5 through a USB interface of the computer 2 provided with the temperature bright color drift curve measurement software, the computer 2 provided with the temperature bright color drift curve measurement software controls the lighting state of the LED multi-primary-color lamp 1, and monitors the temperature of an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp 1 in real time.
The computer 2 provided with the temperature brightness drift curve measurement software is connected with the brightness measurement instrument 4 through a USB interface of the computer 2 provided with the temperature brightness drift curve measurement software, the brightness measurement instrument 4 is used for controlling and measuring current brightness data including color coordinates (x, Y) and a brightness value Y of each primary color of the LED multi-primary-color lamp 1 at different temperatures through the temperature brightness drift curve measurement software of the computer 2 provided with the temperature brightness drift curve measurement software, and the brightness data is one of luminous flux, illumination of an irradiated surface and brightness of the irradiated surface.
The method for correcting the temperature color drift in real time comprises the following preparation steps before correction: connecting a brightness measuring instrument 4 with the corrected LED multi-primary-color lamp 1, respectively connecting temperature brightness drift curve measuring software with the corrected LED multi-primary-color lamp 1 and the brightness measuring instrument 4, and setting a temperature measuring interval delta T, and further comprising the following steps of:
1) actually measuring the temperature curve original data of the LED multi-primary-color lamp 1, including color coordinates-temperature and brightness-temperature, comprises the following steps:
1.1) the software for measuring the temperature, brightness and drift curve regularly uses the standard RDM protocol instruction to monitor the current temperature value t on the aluminum substrate of the LED luminous unit of the LED multi-primary-color lamp 1_current；
1, 2) cooling the current temperature on the aluminum substrate of the LED light-emitting unit of the LED multi-primary color lamp 1 to the lower limit t of the working temperature0Then, starting temperature curve original data comprising color coordinates-temperature and brightness-temperature of the actually measured LED multi-primary-color lamp 1 on a temperature bright color drift curve measuring software interface;
1.3) a computer 2 provided with temperature bright color drift curve measurement software controls to respectively and independently light all n primary colors C of the LED multi-primary-color lamp 1 in sequencenThe brightness measuring instrument 4 is controlled to measure the original brightness data (x, Y; Y) of each primary color including color coordinates (x, Y) and a brightness value Y, respectively: (C)i_x_t0，Ci_y_t0；Ci_Y_t0) And respectively records the ith primary color C of the LED multi-primary-color lamp 1iCurrent temperature t of aluminum substrate of LED light-emitting unit during primary color measurement0_CiWherein i is 1 to n;
1.4) simultaneously lightening and heating the primary colors of the LED multi-primary-color lamp 1 at the highest brightness, monitoring the temperature by real-time temperature color drift correction software, and when the temperature reaches t1＝t0+ Δ T, starting the second round of measurement, repeating substeps 1 and 3), and respectively controlling the bright color measuring instrument 4 to measure the original bright color data (x, Y; y): (C)i_x_t1，Ci_y_t1；Ci_Y_t1) And recording the measurement of the ith primary CiCurrent temperature t of1_CiWherein i is 1 to n;
1.5) repeating substeps 1.4) until the temperature rises to the upper limit of the temperature range, yielding m ═ (t)max-tmin) The/Δ T +1 group includes original luminance data groups of color coordinates (x, Y) and luminance values Y, and the original luminance data groups of the m groups include original luminance data (x, Y; y).
2) Constructing a dynamic polynomial fitting function from the original data measured in the step 1), sending a coefficient group of the generated dynamic polynomial fitting function to a color management operation unit of a control unit of the LED multi-primary-color lamp 1 for checking and correcting effects in a research and development stage, storing the coefficient group into a temperature drift file, and sending the temperature drift file to the color management operation unit of the control unit of the LED multi-primary-color lamp 1 in the same batch in a production line correction link, wherein the method comprises the following steps:
2.1) converting the first primary color C1The raw color data for m sets at different temperatures are arranged in the following form:
(t0_C1，C1_x_t0)，(t1_C1，C1_x_t1)……(tm_C1，C1_x_tm)；
(t0_C1，C1_y_t0)，(t1_C1，C1_y_t1)……(tm_C1，C1_y_tm)；
(t0_C1，C1_Y_t0)，(t1_C1，C1_Y_t1)……(tm_C1，C1_Y_tm)；
and respectively carrying out polynomial fitting to obtain the following coefficient groups of the three groups of dynamic polynomial functions:
(a0_C1_x，a1_C1_x……aj_C1x); wherein j is the polynomial degree;
(a0_C1_y，a1_C1_y……ak_C1y); wherein k is a polynomial degree;
(a0_C1_Y，a1_C1_Y……al_C1y); wherein l is the polynomial degree;
the first primary color C1The CIE _ x coordinate of (a) is expressed as a function of temperature as an independent variable:
C1_x(t)＝a0_C1_x+a1_C1_x×t+a2_C1_x×t2+……；
C1_y(t)＝a0_C1_y+a1_C1_y×t+a2_C1_y×t2+……；
C1_Y(t)＝a0_C1_Y+a1_C1_Y×t+a2_C1_Y×t2+……；
the degree of polynomial fitting is preferably selected from 1-5 times based on the principle that the error of the fitting result is minimum;
2.2) repeating the substeps 2.1) to obtain the coefficient group of the dynamic polynomial function of all the n primary color original bright color data with the temperature as an independent variable:
Ci_x(t)，Ci_y(t)；Ciy (t); wherein i is 1 to n;
and 2.3) sending the dynamic polynomial function coefficient group in the n function groups obtained in the step 2.2) to a color management operation unit on a control panel of the LED multi-primary-color lamp 1 for storage.
3) The method comprises the following steps that a color management operation unit of the LED multi-primary-color lamp 1 obtains bright color data comprising color coordinates (x, Y) and a brightness value Y at different temperatures through function operation by using an existing internal temperature curve function, original bright color data comprising color coordinates and brightness values and stored during production line correction, and the real-time temperature of the current LED multi-primary-color lamp 1, and corrects temperature color drift data in real time, and comprises the following sub-steps:
3.1) multiple bases for a particular LEDA color lamp 1 for measuring all n primary colors C thereofnColor coordinates (x, Y) and luminance values Y when lit individually at the same gray level, and recording all n primary colors CnTemperature point t at the time of respective measurementcal_CiTo obtain tcal_CiAll n primary colors C at temperaturenBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcal，Ci_y_tcal；Ci_Y_tcalwherein i is 1 to n;
3.2) mixing of above tcalAll n primary colors C at Ci temperaturenThe bright color data comprising color coordinates (x, Y) and a brightness value Y are sent to a color management operation unit of the LED multi-primary-color lamp 1 for storage;
3.3) in the daily work of the LED multi-primary-color lamp 1, the color management operation unit acquires the current temperature data t on the aluminum substrate of the LED light-emitting unit 1 in real timecurrentCalculating the current temperature point t by using the following formulacurrentAll n primary colors C after temperature correctionnBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcurrent＝Ci_x_tcal+[Ci_x(tcurrent)-Ci_x(tcal_Ci)]；
Ci_y_tcurrent＝Ci_y_tcal+[Ci_y(tcurrent)-Ci_y(tcal_Ci)]；
Ci_Y_tcurrent＝Ci_Y_tcal×[Ci_Y(tcurrent)/Ci_Y(tcal_Ci)]；
wherein i is 1 to n;
3.4) correcting the temperature of the substep 3.3) to obtain all n primary colors CnThe bright color data including color coordinates (x, Y) and brightness value Y are substituted into the subsequent color management operation, the temperature color drift is corrected in real time from a data source, and the temperature color drift of the LED multi-primary-color lamp 1 is greatly improved and reduced.
This embodiment may use the same set of temperature profiles for the same batch. Particularly, the method has the practicability of large-scale mass production, and the time-consuming temperature curve measurement is completed in the sample lamp research and development stage without lamp-by-lamp measurement in a production line. The color output of various forms including color output, color temperature output and color coordinate output in a full color gamut can be greatly improved or even eliminated, and the color drift of white light and various mixed light at different temperatures is avoided. The method has the advantages of simple operation, efficient process, reliable data and good temperature color drift correction effect.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, the same properties or uses of the invention should be considered as falling within the scope of the present invention as defined by the appended claims, if any such equivalent substitution or obvious modification is made without departing from the spirit of the invention.
Claims (7)
1. A real-time temperature color drift correction device of an LED multi-primary-color lamp comprises a computer connected with the LED multi-primary-color lamp, at least one temperature sensor arranged on an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp, and a bright color measuring instrument respectively connected with the LED multi-primary-color lamp and the computer, wherein the temperature sensor acquires current temperature data of the aluminum substrate of the LED multi-primary-color lamp in real time, the LED multi-primary-color lamp is provided with a control unit comprising a color management operation unit, the color management operation unit is embedded algorithm software, the color management operation unit stores original bright color data and temperature values of all primary colors of the LED multi-primary-color lamp, which are actually measured under time and working temperature and comprise color coordinates (x, Y) and a brightness value Y, and the received color data, the temperature values and the temperature values are subjected to received color shift through an embedded chromatic operation algorithm, The color temperature or color coordinate control instruction is used for calculating and outputting each primary color matching data of the LED multi-primary color lamp; and storing a polynomial fitting function of temperature curves comprising color coordinates-temperature and brightness-temperature, which influence the LED multi-primary color lamp on the output brightness of each primary color, and performing real-time temperature correction on the original brightness data of each primary color, wherein the polynomial fitting function is characterized in that:
the computer is provided with temperature bright color drift curve measurement software, the temperature bright color drift curve measurement software provides a human-computer interaction interface, the temperature of the LED multi-primary color lamp and the measured data of each primary color are displayed on the interface in real time, a temperature bright color drift curve drawn according to the measured data is constructed, a dynamic polynomial fitting function is constructed according to the measured data after the bright color data are collected, and the coefficient group of the polynomial fitting function is sent to a color management operation unit in the LED multi-primary color lamp control unit.
2. The device for real-time correction of temperature color drift of an LED multi-primary color luminaire according to claim 1, wherein:
the computer is connected with the LED multi-primary-color lamp through one of a USB (universal serial bus) to DMX/RDM (digital multimedia broadcasting) bidirectional communication module connection through a USB interface of the computer, a wired network port of the computer through a corresponding network adapter, a wireless network card of the computer through a corresponding network adapter, a Bluetooth communication module of the computer and an infrared communication module of the computer, and controls the lighting state of the LED multi-primary-color lamp and monitors the temperature of an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp in real time.
3. The device for real-time correction of temperature color drift of an LED multi-primary color luminaire according to claim 1, wherein:
the computer is connected with the brightness measuring instrument through one of USB interface connection of the computer, wired network port of the computer through a corresponding network adapter, wireless network card of the computer through a corresponding network adapter, Bluetooth communication module connection of the computer and infrared communication module connection of the computer, the brightness measuring instrument is controlled by temperature brightness drift curve measuring software of the computer to measure current brightness data of each primary color of the LED multi-primary-color lamp at different temperatures, wherein the current brightness data comprises color coordinates (x, Y) and a brightness value Y, and the brightness data is one of luminous flux, illumination of an irradiated surface and brightness of the irradiated surface.
4. A real-time correction method for the temperature color drift real-time correction device of the LED multi-primary color lamp according to any one of claims 1 to 3, comprising the preparation steps before correction: connecting a bright color measuring instrument with the corrected LED multi-primary color lamp, respectively connecting temperature color drift real-time correction software with the corrected LED multi-primary color lamp and the bright color measuring instrument, and setting a temperature measuring interval delta T, wherein the temperature measuring interval delta T is characterized in that:
further comprising the steps of:
1) actually measuring temperature curve original data of the LED multi-primary color lamp, wherein the temperature curve original data comprise color coordinates-temperature and brightness-temperature;
2) constructing a dynamic polynomial fitting function from the original data measured in the step 1), sending a coefficient group of the generated dynamic polynomial fitting function to a color management operation unit of a control unit of the LED multi-primary-color lamp for checking and correcting effects in a research and development stage, storing the coefficient group into a temperature drift file, and sending the temperature drift file to the color management operation unit of the control unit of the LED multi-primary-color lamp in the same batch in a production line correction link;
3) the color management operation unit of the LED multi-primary-color lamp obtains the brightness data comprising color coordinates (x, Y) and a brightness value Y at different temperatures through function operation by using an existing internal temperature curve function, original brightness data and temperature comprising color coordinates and brightness values stored during production line correction and the real-time temperature of the current LED multi-primary-color lamp, and corrects the temperature color drift data in real time.
5. The real-time correction method for the temperature color drift real-time correction device of the LED multi-primary color lamp as claimed in claim 4, characterized in that:
the measurement of the raw data in the step 1) comprises the following sub-steps:
1.1) temperature color drift real timeThe correction software regularly uses standard RDM protocol instructions to monitor the current temperature value t on the aluminum substrate of the LED light-emitting unit of the LED multi-primary-color lamp_current；
1 and 2) cooling the current temperature on an aluminum substrate of an LED light-emitting unit of the LED multi-primary-color lamp to a lower limit t of the working temperature0Starting temperature curve original data of the actually measured LED multi-primary-color lamp, including color coordinates-temperature and brightness-temperature, on a temperature color drift real-time correction software interface;
1.3) respectively and independently lighting all n primary colors C of the LED multi-primary-color lamp in sequence under the control of a computernAnd respectively controlling a brightness measuring instrument to measure original brightness data (x, Y; Y) of each primary color comprising color coordinates (x, Y) and a brightness value Y: (C)i_x_t0，Ci_y_t0；Ci_Y_t0) And respectively recording the ith primary color C of the LED multi-primary-color lampiCurrent temperature t of aluminum substrate of LED light-emitting unit during primary color measurement0_CiWhere i is 1 to n, n is the number of primaries;
1.4) simultaneously lightening and heating the primary colors of the LED multi-primary-color lamp at the highest brightness, monitoring the temperature by real-time temperature color drift correction software, and when the temperature reaches t1＝t0+ Δ T, starting the second round of measurement, repeating steps 1 and 3), and respectively controlling the bright color measuring instrument to measure the original bright color data (x, Y; y): (C)i_x_t1，Ci_y_t1；Ci_Y_t1) And recording the measurement of the ith primary CiCurrent temperature t of1_CiWherein i is 1 to n;
1.5) repeating substeps 1.4) until the temperature rises to the upper limit of the temperature range, yielding m ═ (t)max-tmin) The/Δ T +1 group includes an original bright color data group of color coordinates (x, Y) and a luminance value Y, m is the number of groups of the original bright color data, TmaxIs the upper limit of the temperature range, tminIs the lower limit of the temperature range, the m sets of raw color data sets comprise raw color data (x, Y; Y) of n primary colors comprising color coordinates (x, Y) and a luminance value Y, respectively.
6. The real-time correction method for the temperature color drift real-time correction device of the LED multi-primary color lamp as claimed in claim 4, characterized in that:
the step 2) of constructing a dynamic polynomial fitting function, sending the generated coefficient group of the dynamic polynomial fitting function to a color management operation unit of a control unit of the LED multi-primary-color lamp for checking and correcting effects in a research and development stage, storing the coefficient group into a temperature drift file, and sending the temperature drift file to the color management operation unit of the control unit of the LED multi-primary-color lamp in the same batch in a production line correction link, wherein the color management operation unit comprises the following steps:
2.1) converting the first primary color C1Arranging m groups of original bright color data at different temperatures into a first primary color C1The CIE _ x coordinate of the formula (I) is expressed by a function with temperature as an independent variable, and the times of polynomial fitting are preferably selected from 1 time, 2 times, 3 times, 4 times and 5 times based on the principle that the error of a fitting result is minimum;
2.2) repeating the substeps 2.1) to obtain the coefficient group of the dynamic polynomial function of all the n primary color original bright color data with the temperature as an independent variable:
Ci_x(t)，Ci_y(t)；Ciy (t); wherein i is 1 to n;
2 and 3) sending the dynamic polynomial function coefficient group in the n function groups obtained in the step 2 and 2) to a color management operation unit of a control unit of the LED multi-primary-color lamp for storage.
7. The real-time correction method for the temperature color drift real-time correction device of the LED multi-primary color lamp as claimed in claim 4, characterized in that:
the step 3) obtains the bright color data comprising color coordinates (x, Y) and a brightness value Y at different temperatures through function operation, and corrects the temperature color drift data in real time, and the method comprises the following steps:
3.1) for a specific LED multi-primary-color lamp, respectively measuring all n primary colors CnColor coordinates (x, Y) and luminance values Y when lit individually at the same gray level, and recording all n primary colors CnTemperature point t at the time of respective measurementcal_CiTo obtain tcal_CiAll n primary colors C at temperaturenBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcal，Ci_y_tcal；Ci_Y_tcalwherein i is 1 to n;
3.2) mixing of above tcalAll n primary colors C at Ci temperaturenThe bright color data comprising color coordinates (x, Y) and a brightness value Y are sent to a color management operation unit of the LED multi-primary-color lamp for storage;
3.3) in daily work of the LED multi-primary-color lamp, the color management arithmetic unit acquires the current temperature data t on the aluminum substrate of the LED light-emitting unit in real timecurrentCalculating the current temperature point t by using the following formulacurrentAll n primary colors C after temperature correctionnBright color data including color coordinates (x, Y) and a luminance value Y:
Ci_x_tcurrent＝Ci_x_tcal+[Ci_x(tcurrent)-Ci_x(tcal_Ci)]；
Ci_y_tcurrent＝Ci_y_tcal+[Ci_y(tcurrent)-Ci_y(tcal_Ci)]；
Ci_Y_tcurrent＝Ci_Y_tcal×[Ci_Y(tcurrent)/Ci_Y(tcal_Ci)]；
wherein i is 1 to n;
3.4) correcting the temperature of the substep 3.3) to obtain all n primary colors CnAnd substituting the bright color data comprising color coordinates (x, Y) and a brightness value Y into subsequent color management operation to correct the temperature color drift from a data source in real time.
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| CN112566334B (en) * | 2020-12-30 | 2023-06-30 | 广州市浩洋电子股份有限公司 | Lamp dimming data calibration method and lamp applying same |
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| CN115315040B (en) * | 2022-07-25 | 2024-04-09 | 上海芯龙光电科技股份有限公司 | LED full spectrum color management system based on RGBWCLA seven-color unification |
| CN117615481B (en) * | 2024-01-24 | 2024-04-09 | 杭州罗莱迪思科技股份有限公司 | Dynamic correction color mixing system and method for influence of self-adaptive temperature on color coordinates |
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