CN110806673A - Full-color composite LED photographic lamp - Google Patents
Full-color composite LED photographic lamp Download PDFInfo
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Abstract
The invention discloses a full-color composite LED photographic lamp, which comprises a shell, a spectrometer in the shell and a plurality of light-emitting units, wherein the light-emitting units comprise: a driving circuit that drives the LED; the control unit is connected with the spectrometer and controls the output of the driving circuit; the white light LED is connected with the driving circuit; the plurality of monochromatic light LEDs are connected with the driving circuit; the monochromatic light LED includes: blue LEDs, pure green LEDs, emerald green LEDs, amber LEDs, and orange-red LEDs. The spectrometer is used for measuring optical parameters of the white light LED, the monochromatic light LED and the composite light. The invention has simple structure, small composite calculation amount, accurate composite and convenient adjustment, the color gamut range is more than or equal to 90 percent, the color rendering index Ra of the white light source is more than or equal to 98, and R1-R15 is more than or equal to 90 percent, thereby being capable of adapting to the lighting requirements of photography, simultaneously, the light source has high adjustment precision and high adjustment speed, being capable of realizing corresponding balance on precision and time according to the needs and providing a good basis for the adjustment and the correction of the composite light source.
Description
Technical Field
The invention relates to the technical field of lighting devices, in particular to a full-color composite LED photographic lamp.
Background
In daily life, the color temperature of the LED white light illumination of a space is fixed and cannot be changed according to seasons, time periods, environments or personal preferences, for example, a cold color temperature light source is favored in summer, and a warm color temperature light source is favored in winter; or simply according to the principle of three primary colors, the white light is synthesized by matching three primary colors RGB (red, green and blue) light sources, but the white light has narrow color temperature range and low color rendering index, and the color of an article or a person containing a red or yellow component is easy to distort due to the lack of yellow light at low color temperature. In some special industries such as film and television play shooting, the brightness and color temperature of the light in the scenes in the film grid need to change along with the story line and the color rendering property is required to be good and not to be distorted. At present, the color rendering property is improved by adding a light supplement lamp in the shooting process, but the method has high cost and is not easy to implement, and the effect of improving the color rendering property is very limited.
Wherein the color rendering index (Ra): the color rendering capability of a light source on an object is called color rendering. The CIE specified 15 test colors, and R1-R15 respectively represented color rendering indices of the 15 colors, the first 8 average values were Ra, and R9-R15 were special color rendering indices, where R9 was saturated red, R10 was saturated yellow, R11 was saturated green, R12 was saturated blue, R13 was caucasian skin color, R14 was tree green, and R15 was caucasian skin color.
The conventional LED white light illumination and the three primary colors RGB (red, green and blue) light source are matched to synthesize white light, the color temperature is single or the color temperature range is narrow, the color rendering index is low (Ra is less than or equal to 90), and especially the effect is worse on special color rendering indexes (R9-R15), such as R9 (saturated red) and R15 (yellow human skin color) are important. In addition, due to the limitation of the three primary colors, the color gamut of the emitted light is narrow, and many colors cannot be accurately displayed.
The invention of an authorization notice number CN102376857B discloses a packaging method of a light emitting mode of an LED with a specific wavelength, which comprises the following raw materials of A glue, B glue, CP glue, special fluorescent powder, an LED blue light chip with a specific wavelength and special pigment, wherein the specific preparation method comprises the following steps: 1. mixing the glue A, the glue B, the glue CP and the special fluorescent powder to form fluorescent glue; 2. manufacturing fluorescent glue and an LED blue light chip with a specific wavelength into a white light LED light source base frame; 3. uniformly mixing the glue A, the glue B and the special pigment to form epoxy glue; 4. the epoxy glue is packaged on a white light LED light source base frame, and after white light passes through the epoxy glue, a special LED with a specific wavelength is formed.
In addition, the publication number CN106543942A discloses a white light LED powder adhesive and a preparation method of the white light LED powder adhesive. The invention with the authorization notice number CN104918369B discloses a functional lighting system based on an LED light source.
The prior art has made some new breakthroughs on the manufacture of monochromatic light and white light LEDs, and the prior art also has the problem that the color rendering of the composite light source is optimized through an optimization algorithm, but the color rendering index is affected by light with various wavelengths in the composite light source, if the monochromatic light with certain specific wavelengths is lacked, the color rendering index cannot be effectively improved no matter how the calculation is optimized, and how to obtain the light source with wide color gamut, high color rendering index and wide color temperature range through the compounding of various monochromatic lights is the problem in the prior art at present.
Disclosure of Invention
Aiming at the problems of narrow color gamut, low color rendering index and narrow color temperature range of a composite light source in the prior art, the invention provides a full-color composite LED photographic lamp, which realizes wider color gamut and higher color rendering index through the composition of a plurality of specific LEDs, has higher special color rendering index and can replace a light supplement lamp in the photographic process.
The technical scheme of the invention is as follows.
The utility model provides a full-color compound LED photography luminaire, includes spectrum appearance and a plurality of luminescence unit in casing, the casing, and the luminescence unit includes:
a driving circuit that drives the LED; the control unit is connected with the spectrometer and controls the output of the driving circuit; the white light LED is connected with the driving circuit; the plurality of monochromatic light LEDs are connected with the driving circuit; the monochromatic light LED includes: blue LEDs, pure green LEDs, emerald green LEDs, amber LEDs, and orange-red LEDs. The spectrometer is used for measuring optical parameters of the white light LED, the monochromatic light LED and the composite light.
The color rendering index of light and the color gamut range capable of being displayed relate to the influence of various factors, wherein the closer to sunlight, the higher the color rendering index is, but the proportions of all colors of sunlight are different, so that the color rendering index cannot be effectively improved by simply superposing three primary colors; the color gamut range that can show simultaneously also is modern illumination or display device's important parameter, though prior art can improve the color rendering index Ra to a certain extent through optimization algorithm, but to the special color rendering index such as R9-R15, because light source itself lacks the light of corresponding wavelength among the prior art, no matter how optimization algorithm can not effectively improve special color rendering index, and this scheme has selected specific white light LED and a plurality of specific monochromatic light LED to compound, can realize simulating the high color rendering index of sunlight according to the demand, there are higher special color rendering index and great color gamut range that most light sources did not possess simultaneously again.
Preferably, the color temperature of the white light LED is 4200K ± 150K, and the wavelengths of the monochromatic light LEDs are: blue light LED: 450nm +/-10 nm; pure green light LED: 520nm plus or minus 10 nm; green light LED: 545nm +/-10 nm; amber light LED: 598nm +/-10 nm; orange-red light LED: 630nm +/-10 nm. The LED is used for achieving the technical effects that the color gamut range is larger than or equal to 90%, the white light source color rendering index Ra is larger than or equal to 98, and R1-R15 is larger than or equal to 90. The technical effect of the scheme cannot be realized by changing any LED. Wherein the white light LED is made by the technical content of the invention application with publication number CN106543942A mentioned in the background. The emerald green light LED and the amber light LED are both manufactured according to the invention content of the authorization notice number CN102376857B mentioned in the background art, and are LEDs with special wavelengths.
The control unit performs the following steps: s01: controlling a driving circuit to enable a white light LED and a plurality of monochromatic light LEDs to work at rated working current; s02: testing the color coordinates and the reference luminous flux of the white light LED and the plurality of monochromatic light LEDs; s03: setting color coordinates (xm, ym) and luminous flux L of the required composite light; s04: forming 20 color gamut blocks by every 3 LEDs, judging whether the color gamut blocks contain the color coordinates of the composite light, and calculating the requirement proportion of the required luminous flux of the 3 LEDs in the color gamut blocks, wherein the color gamut blocks are effective blocks if the color gamut blocks contain the color coordinates of the composite light, and the color gamut blocks are discarded if the color gamut blocks do not contain the color coordinates; s05: and calculating the actual luminous flux of each LED by combining the luminous flux of the composite light, the reference luminous flux of the LED and the required proportion of the luminous flux of each LED in the effective block, and synchronously adjusting the driving circuit to generate the required composite light. In the method, the color gamut block formed by 3 LEDs is triangular, and the light-emitting result is more accurate and the subsequent adjustment is more convenient by means of independent calculation and then unified calculation.
Preferably, in step S02, the color coordinates of the white light LED are (x1, y1), and the reference luminous flux is l 1; the blue light LED has color coordinates of (x2, y2) and a reference luminous flux of l 2; the color coordinates of the pure green light LED are (x3, y3), and the reference luminous flux is l 3; the green light LED has color coordinates of (x4, y4) and a reference luminous flux of l 4; the amber light LED has color coordinates of (x5, y5) and a reference luminous flux of l 5; the color coordinates of the orange-red light LED are (x6, y6), and the reference luminous flux is l 6; preferably, the process of step S04 includes: white light LED, blue light LED and pure green light LED constitute a triangular color gamut block, and for this color gamut block, there are:
wherein l1 ' is the required luminous flux of the white light LED, l2 ' is the required luminous flux of the blue light LED, and l3 ' is the required luminous flux of the pure green light LED, and the sum of 3 required luminous fluxes is set as unit 1, so that the required proportion of 3 required luminous fluxes can be obtained; calculating the demand proportion of the required luminous flux of each LED in the rest 19 color gamut blocks in the same method; and when the specific gravity has a negative number, the color coordinate of the composite light is not contained in the color gamut block, the color gamut block is discarded, and the color gamut block without the negative number in the specific gravity contains the color coordinate of the composite light and is an effective block.
Preferably, the process of step S05 includes: adding the required proportion of each LED in the plurality of groups of required proportions of each effective block separately, namely adding the required proportions of a plurality of groups l1 'to obtain an actual proportion l 1', adding the required proportions of a plurality of groups l2 'to obtain an actual proportion l 2', and adding the required proportions of a plurality of groups l6 'to obtain an actual proportion l 6'; calculating the actual luminous flux of each LED according to the luminous flux L of the composite light:
L＝K(l1×l1″+l2×l2″+…l6×l6″)
calculating a luminous flux coefficient K according to known parameters, wherein the actual luminous flux of the white light LED is Kxl 1 xl 1 ', the actual luminous flux of the blue light LED is Kxl 2 xl 2', and so on, and the actual luminous fluxes of the pure green light LED, the emerald green light LED, the amber light LED and the orange red light LED are obtained; the control unit adjusts the driving circuit by taking the actual luminous flux of each LED as a target until the actual luminous flux condition is met, and composite light with the color coordinate and the luminous flux both being set values is generated.
In the above steps, the actual luminous flux is obtained by calculating the individual specific gravity and then integrally calculating, so as to realize the compounding of the designated composite light. The calculated amount is small, and the accuracy is high.
Preferably, the step S05 further includes a brightness correction after completion, and the method includes the following steps:
s61: reading preset parameters of a light source and an LED and parameters detected by a spectrometer, and comparing the detected parameters with the preset parameters to obtain a color coordinate, an offset vector of the color coordinate, luminous flux and a luminous flux variation ratio;
s62: if the light flux variation ratio and the color coordinate of the light source are both within the set error range, returning to the previous step, otherwise, performing the next step;
s63: if the color coordinate of the light source exceeds the error range, calculating the component vectors of the color coordinate of the preset light source and the color coordinate of each LED, and adjusting the luminous flux of each LED one by combining the data of the step S01 until the color coordinate of the light source is adjusted within the error range, and if the variation ratio of the luminous flux exceeds the error range, synchronously adjusting the luminous flux of each current LED according to a set proportion until the variation ratio of the luminous flux is adjusted within the error range;
s64: return is made to step S61.
In the step S61, the color coordinate offset vector is
The total luminous flux variation ratio Q of the light source is (L-L ')/L, and the luminous flux variation ratio Q of each LED is (L-L ')/L, wherein P is a preset parameter color coordinate of the light source, P ' is a currently detected color coordinate of the light source, L is a preset luminous flux of the light source, L ' is a currently detected luminous flux of the light source, L is a preset luminous flux of each LED, and L ' is a current luminous flux of the LED.
The adjustment process of the color coordinates of the light source in step S63 includes:
a01: calculating a plurality of component vectors expressed as
Wherein A is the color coordinate of the corresponding LED of the component vector and is replaced according to the corresponding LED;
a02: sorting the absolute values of a plurality of sub-vectors from small to large, and setting an initial row value n as 1;
a03: selecting the nth component vector in the sequence and the corresponding LED luminous flux, and changing the luminous flux of the corresponding LED by a ratio qnIs equally divided into mnShare ratio, execution a 04;
a04: such asIf the included angle between the light source and the corresponding component vector is less than 90 degrees, the luminous flux of the corresponding LED is adjusted to be lower according to the division ratio, if the included angle is greater than 90 degrees, the luminous flux of the corresponding LED is adjusted to be higher according to the division ratio, if the included angle is equal to 90 degrees, the adjustment is not carried out, after each adjustment, whether the color coordinate of the light source is adjusted to be within the error range is judged, if yes, the adjustment is finished, otherwise, A05 is executed;
a05: judging whether the adjustment times reach mnIf not, returning to A04, if so, adding n to the value and returning to A03;
a06: and when n is larger than the number of the LEDs, finishing the adjustment and prompting an error.
The adjustment of the color coordinates is used for correcting the color of the light source, the adjustment of the luminous flux variation ratio is used for correcting the light intensity, and the accuracy of the adjustment of the color coordinates is improved in a mode of adjusting the LEDs step by step one by step. And through sorting, the LED closest to the color coordinate of the light source in the color gamut map is firstly adjusted, because the LED has the largest influence on the color coordinate of the current light source, and sectional adjustment is adopted in the adjustment degree, so that the accuracy is further improved, and after the LED is adjusted, the next-nearest LED is adjusted, and so on until the adjustment is finished. The adjusting mode takes account of the speed and the accuracy of the adjustment.
Has good effectOptionally, in the process of adjusting the color coordinates of the light source: m isnIs a set value and satisfies mk-1≥mkWherein k is 2 or more and n or less. Wherein m isnAccording to the desired adjustment time and accuracy setting, mnThe larger the value of (a), the longer the adjustment time and the more precise the adjustment, generally taking the single digit. The adjustment range of the technical scheme is that the LED adjusted earlier is smaller in adjustment range every time, and deviation is easy to occur because the LED is adjusted to a large extent from the beginning.
Preferably, the mobile terminal device further comprises a communication module and a current acquisition circuit, wherein the communication module is connected with the control unit and is in communication connection with the mobile terminal device, the acquisition end of the current acquisition circuit is connected with the LED, and the output end of the current acquisition circuit is connected with the control unit. After the mobile terminal equipment such as a mobile phone is in communication connection, the lighting parameters of the photographing lamp can be selected through the control of the mobile phone.
Preferably, the six different LEDs of the light emitting unit form a 2 × 3 LED array, and the photography lamp includes a plurality of groups of LED arrays arranged in a consistent manner. Through the rectangular LED array, the process is simple, the production cost is low, and the composite effect is good.
The substantial effects of the invention include: the composite light source device has the advantages of simple structure, small composite calculated amount, high composite accuracy, convenience and quickness in adjustment, the color gamut range is larger than or equal to 90%, the color rendering index Ra of the white light source is larger than or equal to 98, and R1-R15 is larger than or equal to 90, so that the lighting requirement of photography can be met, meanwhile, the light source adjustment accuracy is high, the adjustment speed is high, corresponding balance in accuracy and time can be realized according to the requirement, and a good basis is provided for adjustment and correction of the composite light source.
Drawings
FIG. 1 is a schematic diagram of a light-emitting unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a driving circuit according to an embodiment of the present invention;
FIG. 3 is a color gamut block diagram according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of color coordinate adjustment according to an embodiment of the present invention;
the figure includes: 1-control unit, 2-drive circuit, 3-white light LED, 4-monochromatic light LED, 5-spectrometer, 6-temperature sensor.
Detailed Description
The technical scheme is further explained by combining the drawings in the specification.
A full-color composite LED photography lamp comprises a shell, wherein a spectrometer 5 and a plurality of light-emitting units are arranged in the shell, the spectrometer 5 is shown in figure 1, and the light-emitting units comprise: a drive circuit 2 that drives the LED; a control unit 1 that controls the output of the drive circuit 2; a white light LED3 connected with the drive circuit 2; the five monochromatic light LEDs 4 are connected with the driving circuit 2; and the temperature sensor 6 is connected with the control unit 1. The spectrometer 5 is connected with the control unit 1 and is used for measuring optical parameters of the white light LED3, the monochromatic light LED4 and the composite light. In addition, if necessary, the control unit 1 can judge the working state of the LED according to the temperature detected by the temperature sensor 6, and the LED works if the temperature is too high or too low.
Fig. 2 shows one of the driving circuits 2 of the present embodiment, wherein the cathode of the diode D5 is connected to the corresponding load LED. The driving circuits of the six LEDs in the embodiment are consistent.
The color temperature of the white LED3 of this embodiment is 4200K, and the color and wavelength of the monochromatic LED4 are: blue light LED: 450 nm; pure green light LED: 520 nm; green light LED: 545 nm; amber light LED: 598 nm; orange-red light LED: 630 nm.
As shown in fig. 3, the color gamut diagram is marked with the color coordinate positions of the LEDs, where the white LED is point W, the blue LED is point B, the pure green LED is point G1, the emerald LED is point G2, the amber LED is point a, and the orange-red LED is point R.
The color rendering index of light and the color gamut range capable of being displayed relate to the influence of various factors, wherein the closer to sunlight, the higher the color rendering index is, but the proportions of all colors of sunlight are different, so that the color rendering index cannot be effectively improved by simply superposing three primary colors; the color gamut range that can show simultaneously also is modern illumination or display device's important parameter, though prior art can improve the color rendering index Ra to a certain extent through optimization algorithm, but to the special color rendering index such as R9-R15, because light source itself lacks the light of corresponding wavelength among the prior art, no matter how optimization algorithm can not effectively improve special color rendering index, and this scheme has selected specific white light LED and a plurality of specific monochromatic light LED to compound, can realize simulating the high color rendering index of sunlight according to the demand, there are higher special color rendering index and great color gamut range that most light sources did not possess simultaneously again.
The control unit 1 of the present embodiment performs the following steps: s01: controlling a driving circuit to enable a white light LED and a plurality of monochromatic light LEDs to work at rated working current; s02: testing the color coordinates and the reference luminous flux of the white light LED and the plurality of monochromatic light LEDs; s03: setting color coordinates (xm, ym) and luminous flux L of the required composite light; s04: forming 20 color gamut blocks by every 3 LEDs, judging whether the color gamut blocks contain the color coordinates of the composite light, and calculating the requirement proportion of the required luminous flux of the 3 LEDs in the color gamut blocks, wherein the color gamut blocks are effective blocks if the color gamut blocks contain the color coordinates of the composite light, and the color gamut blocks are discarded if the color gamut blocks do not contain the color coordinates; s05: and calculating the actual luminous flux of each LED by combining the luminous flux of the composite light, the reference luminous flux of the LED and the required proportion of the luminous flux of each LED in the effective block, and synchronously adjusting the driving circuit to generate the required composite light. In the embodiment, the color gamut block formed by 3 LEDs is triangular, and the light-emitting result is more accurate and the subsequent adjustment is more convenient by means of independent calculation and then unified calculation.
In step S02, let the color coordinates of the white LED be (x1, y1) and the reference luminous flux be l 1; the blue light LED has color coordinates of (x2, y2) and a reference luminous flux of l 2; the color coordinates of the pure green light LED are (x3, y3), and the reference luminous flux is l 3; the green light LED has color coordinates of (x4, y4) and a reference luminous flux of l 4; the amber light LED has color coordinates of (x5, y5) and a reference luminous flux of l 5; the color coordinates of the orange-red light LED are (x6, y6), and the reference luminous flux is l 6; in this embodiment, the data of the reference luminous flux is l1 ═ 120lm, l2 ═ 15lm, l3 ═ 100, l4 ═ 150lm, l5 ═ 100lm, and l6 ═ 30lm, respectively.
The color coordinate of the composite light of step S03 is a point P in fig. 3.
The process of step S04 includes: white LEDs, blue LEDs and pure green LEDs are combined into a triangular color gamut block, as shown in fig. 3, for the color gamut block, there are:
wherein l1 ' is the required luminous flux of the white light LED, l2 ' is the required luminous flux of the blue light LED, and l3 ' is the required luminous flux of the pure green light LED, and the sum of 3 required luminous fluxes is set as unit 1, so that the required proportion of 3 required luminous fluxes can be obtained; calculating the demand proportion of the required luminous flux of each LED in the rest 19 color gamut blocks in the same method; and when the specific gravity has a negative number, the color coordinate of the composite light is not contained in the color gamut block, the color gamut block is discarded, and the color gamut block without the negative number in the specific gravity contains the color coordinate of the composite light and is an effective block.
The process of step S05 includes: adding the required proportion of each LED in the plurality of groups of required proportions of each effective block separately, namely adding the required proportions of a plurality of groups l1 ' to obtain an actual proportion l1 ', adding the required proportions of a plurality of groups l2 ' to obtain an actual proportion l2 ', and adding the required proportions of a plurality of groups l6 to obtain an actual proportion l6 '; calculating the actual luminous flux of each LED according to the luminous flux L of the composite light:
L＝K(l1×l1″+l2×l2″+…l6×l6″)
calculating a luminous flux coefficient K according to known parameters, wherein the actual luminous flux of the white light LED is Kxl 1 xl 1 ', the actual luminous flux of the blue light LED is Kxl 2 xl 2', and so on, and the actual luminous fluxes of the pure green light LED, the emerald green light LED, the amber light LED and the orange red light LED are obtained; the control unit adjusts the driving circuit by taking the actual luminous flux of each LED as a target until the actual luminous flux condition is met, and composite light with the color coordinate and the luminous flux both being set values is generated.
In the above steps, the actual luminous flux is obtained by calculating the individual specific gravity and then integrally calculating, so as to realize the compounding of the designated composite light. The calculated amount is small, and the accuracy is high.
After step S05 is completed, the method further includes a correction adjustment, including the following steps:
s61: reading preset parameters of a light source and an LED and parameters detected by a spectrometer, and comparing the detected parameters with the preset parameters to obtain a color coordinate, an offset vector of the color coordinate, luminous flux and a luminous flux variation ratio;
s62: if the light flux variation ratio and the color coordinate of the light source are both within the set error range, returning to the previous step, otherwise, performing the next step;
s63: if the color coordinate of the light source exceeds the error range, calculating the component vectors of the color coordinate of the preset light source and the color coordinate of each LED, and adjusting the luminous flux of each LED one by combining the data of the step S01 until the color coordinate of the light source is adjusted within the error range, and if the variation ratio of the luminous flux exceeds the error range, synchronously adjusting the luminous flux of each current LED according to a set proportion until the variation ratio of the luminous flux is adjusted within the error range;
s64: return is made to step S61.
As shown in fig. 4, in step S61, the color coordinate offset vector is
The total luminous flux variation ratio Q of the light source is (L-L ')/L, and the luminous flux variation ratio Q of each LED is (L-L ')/L, wherein P is a preset parameter color coordinate of the light source, P ' is a currently detected color coordinate of the light source, L is a preset luminous flux of the light source, L ' is a currently detected luminous flux of the light source, L is a preset luminous flux of each LED, and L ' is a current luminous flux of the LED.
The adjustment process of the color coordinates of the light source in step S63 includes:
a01: calculating a plurality of component vectors expressed as
Wherein A is the color coordinate of the corresponding LED of the component vector and is replaced according to the corresponding LED;
a02: sorting the absolute values of a plurality of sub-vectors from small to large, and setting an initial row value n as 1;
a03: selecting the nth component vector in the sequence and the corresponding LED luminous flux, and changing the luminous flux of the corresponding LED by a ratio qnIs equally divided into mnDivision ratio, execution A04；
A04: such as
If the included angle between the light source and the corresponding component vector is less than 90 degrees, the luminous flux of the corresponding LED is adjusted to be lower according to the division ratio, if the included angle is greater than 90 degrees, the luminous flux of the corresponding LED is adjusted to be higher according to the division ratio, if the included angle is equal to 90 degrees, the adjustment is not carried out, after each adjustment, whether the color coordinate of the light source is adjusted to be within the error range is judged, if yes, the adjustment is finished, otherwise, A05 is executed;
a05: judging whether the adjustment times reach mnIf not, returning to A04, if so, adding n to the value and returning to A03;
a06: and when n is larger than the number of the LEDs, finishing the adjustment and prompting an error.
The adjustment of the color coordinates is used for correcting the color of the light source, the adjustment of the luminous flux variation ratio is used for correcting the light intensity, and the accuracy of the adjustment of the color coordinates is improved in a mode of adjusting the LEDs step by step one by step. And through sorting, the LED closest to the color coordinate of the light source in the color gamut map is firstly adjusted, because the LED has the largest influence on the color coordinate of the current light source, and sectional adjustment is adopted in the adjustment degree, so that the accuracy is further improved, and after the LED is adjusted, the next-nearest LED is adjusted, and so on until the adjustment is finished. The adjusting mode takes account of the speed and the accuracy of the adjustment.
In the process of adjusting the color coordinates of the light source: m isnIs a set value and satisfies mk-1≥mkWherein k is 2 or more and n or less. Wherein m isnAccording to the desired adjustment time and accuracy setting, mnThe larger the value of (a), the longer the adjustment time and the more precise the adjustment, generally taking the single digit. The adjustment range of the technical scheme is that the LED adjusted earlier is smaller in adjustment range every time, and deviation is easy to occur because the LED is adjusted to a large extent from the beginning.
The embodiment further comprises a communication module and a current acquisition circuit, the communication module is connected with the control unit and is in communication connection with the mobile terminal device, the acquisition end of the current acquisition circuit is connected with the LED, and the output end of the current acquisition circuit is connected with the control unit. After the mobile terminal equipment such as a mobile phone is in communication connection, the lighting parameters of the photographing lamp can be selected through the control of the mobile phone.
In this embodiment, six different LEDs of the light emitting unit form a 2 × 3 LED array, and the camera lamp includes a plurality of groups of LED arrays arranged in the same manner. Through the rectangular LED array, the process is simple, the production cost is low, and the composite effect is good.
Other advantages of this embodiment are not described in detail.
Through the description of the above embodiments, those skilled in the art will understand that, for convenience and simplicity of description, only the division of the above functional modules is used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of a specific device is divided into different functional modules to complete all or part of the above described functions.
In the embodiments provided in this application, it should be understood that the disclosed structures and methods may be implemented in other ways. For example, the above-described embodiments with respect to structures are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may have another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another structure, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, structures or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a full-color compound LED photography luminaire, includes spectrum appearance and a plurality of luminescence unit in casing, the casing, its characterized in that, the luminescence unit includes:
a driving circuit that drives the LED;
the control unit is connected with the spectrometer and controls the output of the driving circuit;
the white light LED is connected with the driving circuit;
the plurality of monochromatic light LEDs are connected with the driving circuit;
the monochromatic light LED includes: blue LEDs, pure green LEDs, emerald green LEDs, amber LEDs, and orange-red LEDs.
2. The full-color composite LED photography lamp according to claim 1, wherein the color temperature of the white LED is 4200K ± 150K, and the wavelengths of the monochromatic LEDs are respectively:
blue light LED: 450nm +/-10 nm;
pure green light LED: 520nm plus or minus 10 nm;
green light LED: 545nm +/-10 nm;
amber light LED: 598nm +/-10 nm;
orange-red light LED: 630nm +/-10 nm.
3. The full-color composite LED photographic lamp according to claim 1 or 2,
the control unit performs the following steps:
s01: controlling a driving circuit to enable a white light LED and a plurality of monochromatic light LEDs to work at rated working current;
s02: testing the color coordinates and the reference luminous flux of the white light LED and the plurality of monochromatic light LEDs;
s03: setting color coordinates (xm, ym) and luminous flux L of the required composite light;
s04: forming 20 color gamut blocks by every 3 LEDs, judging whether the color gamut blocks contain the color coordinates of the composite light, and calculating the requirement proportion of the required luminous flux of the 3 LEDs in the color gamut blocks, wherein the color gamut blocks are effective blocks if the color gamut blocks contain the color coordinates of the composite light, and the color gamut blocks are discarded if the color gamut blocks do not contain the color coordinates;
s05: and calculating the actual luminous flux of each LED by combining the luminous flux of the composite light, the reference luminous flux of the LED and the required proportion of the luminous flux of each LED in the effective block, and synchronously adjusting the driving circuit to generate the required composite light.
4. The full-color composite LED photographic lamp of claim 3, wherein in the step S02, the color coordinates of the white LED are (x1, y1), and the reference luminous flux is l 1; the blue light LED has color coordinates of (x2, y2) and a reference luminous flux of l 2; the color coordinates of the pure green light LED are (x3, y3), and the reference luminous flux is l 3; the green light LED has color coordinates of (x4, y4) and a reference luminous flux of l 4; the amber light LED has color coordinates of (x5, y5) and a reference luminous flux of l 5; the color coordinates of the orange-red light LED are (x6, y6), and the reference luminous flux is l 6.
5. The full-color composite LED photographic lamp according to claim 4, wherein the process of step S04 includes: white light LED, blue light LED and pure green light LED constitute a triangular color gamut block, and for this color gamut block, there are:
wherein l1 ' is the required luminous flux of the white light LED, l2 ' is the required luminous flux of the blue light LED, and l3 ' is the required luminous flux of the pure green light LED, and the sum of 3 required luminous fluxes is set as unit 1, so that the required proportion of 3 required luminous fluxes can be obtained;
calculating the demand proportion of the required luminous flux of each LED in the rest 19 color gamut blocks in the same method;
and when the specific gravity has a negative number, the color coordinate of the composite light is not contained in the color gamut block, the color gamut block is discarded, and the color gamut block without the negative number in the specific gravity contains the color coordinate of the composite light and is an effective block.
6. The full-color composite LED photographic lamp according to claim 5, wherein the process of step S05 includes: adding the required specific gravity of each LED in the groups of required specific gravity of each effective block separately, namely adding the required specific gravity of the groups l1 'to obtain an actual specific gravity l 1', adding the required specific gravity of the groups l2 'to obtain an actual specific gravity l2 ", until adding the required specific gravity of the groups l 6' to obtain an actual specific gravity l 6"; calculating the actual luminous flux of each LED according to the luminous flux L of the composite light:
L＝K(l1×l1″+l2×l2″+…l6×l6″)
calculating a luminous flux coefficient K according to known parameters, wherein the actual luminous flux of the white light LED is Kxl 1 xl 1 ', the actual luminous flux of the blue light LED is Kxl 2 xl 2', and so on, and the actual luminous fluxes of the pure green light LED, the emerald green light LED, the amber light LED and the orange red light LED are obtained;
the control unit adjusts the driving circuit by taking the actual luminous flux of each LED as a target until the actual luminous flux condition is met, and composite light with the color coordinate and the luminous flux both being set values is generated.
7. The full-color composite LED photography lamp according to claim 3, wherein the step S05 is completed and further comprises the step of adjusting the light source, comprising the steps of:
s61: reading preset parameters of a light source and an LED and parameters detected by a spectrometer, and comparing the detected parameters with the preset parameters to obtain a color coordinate, an offset vector of the color coordinate, luminous flux and a luminous flux variation ratio;
s62: if the light flux variation ratio and the color coordinate of the light source are both within the set error range, returning to the previous step, otherwise, performing the next step;
s63: if the color coordinate of the light source exceeds the error range, calculating the component vectors of the color coordinate of the preset light source and the color coordinate of each LED, and adjusting the luminous flux of each LED one by combining the data of the step S01 until the color coordinate of the light source is adjusted within the error range, and if the variation ratio of the luminous flux exceeds the error range, synchronously adjusting the luminous flux of each current LED according to a set proportion until the variation ratio of the luminous flux is adjusted within the error range;
s64: returning to step S61;
in the step S61, the color coordinate offset vector isThe total luminous flux variation ratio Q of the light source is (L-L ')/L, and the luminous flux variation ratio Q of each LED is (L-L')/L, wherein P is the preset parameter color coordinate of the light source, P 'is the currently detected color coordinate of the light source, L is the preset luminous flux of the light source, L' is the currently detected luminous flux of the light source, and L is the luminous flux of each LEDThe preset luminous flux of the LED, and l' is the current luminous flux of the LED;
the adjustment process of the color coordinates of the light source in step S63 includes:
a01: calculating a plurality of component vectors expressed asWherein A is the color coordinate of the corresponding LED of the component vector and is replaced according to the corresponding LED;
a02: sorting the absolute values of a plurality of sub-vectors from small to large, and setting an initial row value n as 1;
a03: selecting the nth component vector in the sequence and the corresponding LED luminous flux, and changing the luminous flux of the corresponding LED by a ratio qnIs equally divided into mnShare ratio, execution a 04;
a04: such asIf the included angle between the light source and the corresponding component vector is less than 90 degrees, the luminous flux of the corresponding LED is adjusted to be lower according to the division ratio, if the included angle is greater than 90 degrees, the luminous flux of the corresponding LED is adjusted to be higher according to the division ratio, if the included angle is equal to 90 degrees, the adjustment is not carried out, after each adjustment, whether the color coordinate of the light source is adjusted to be within the error range is judged, if yes, the adjustment is finished, otherwise, A05 is executed;
a05: judging whether the adjustment times reach mnIf not, returning to A04, if so, adding n to the value and returning to A03;
a06: and when n is larger than the number of the LEDs, finishing the adjustment and prompting an error.
8. The full-color composite LED photographic lamp according to claim 7, wherein the adjustment of the color coordinates of the light source comprises: m isnIs a set value and satisfies mk-1≥mkWherein k is 2 or more and n or less.
9. The full-color composite LED photographic lamp according to claim 1, 6 or 7, further comprising a communication module and a current collection circuit, wherein the communication module is connected with the control unit, the communication module is in communication connection with the mobile terminal device, the collection end of the current collection circuit is connected with the LED, and the output end of the current collection circuit is connected with the control unit.
10. The full-color composite LED photography lamp according to claim 1, 6 or 7, wherein the six different LEDs of the light-emitting unit form a 2 x3 LED array, and the photography lamp comprises a plurality of groups of LED arrays arranged in a consistent manner.
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