CN110784960B

CN110784960B - Full-color LED composite light source and composite method

Info

Publication number: CN110784960B
Application number: CN201910746753.XA
Authority: CN
Inventors: 谢琦明; 付亮; 田荣刚
Original assignee: Hangzhou Xinhu Electronic Co ltd
Current assignee: Hangzhou Xinhu Electronic Co ltd
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2021-08-03
Anticipated expiration: 2039-08-14
Also published as: CN110784960A

Abstract

The invention discloses a full-color LED composite light source and a composite method, which are used for generating composite light, wherein the light source comprises a drive circuit and also comprises: a control unit which controls an output of the drive circuit; the white light LED is connected with the driving circuit; the plurality of monochromatic light LEDs are connected with the driving circuit; the spectrometer is connected with the control unit and is used for measuring optical parameters of the white light LED, the monochromatic light LED and the composite light; the monochromatic light LED includes: blue LEDs, pure green LEDs, emerald green LEDs, amber LEDs, and orange-red LEDs. The LED color gamut light source is simple in structure, small in composite calculation amount, accurate in composition and convenient and fast to adjust, wider color gamut and higher color rendering index are achieved through composition of the specific LEDs, and meanwhile the illumination requirements of various fields are met.

Description

Full-color LED composite light source and composite method

Technical Field

The invention relates to the technical field of lighting devices, in particular to a full-color LED composite light source and a composite method.

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 specific 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 distorted; if the displayed object is required to be truly reproduced, the light source color rendering property is required to be high.

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 LED composite light source and a composite method.

The technical scheme of the invention is as follows.

A full-color LED composite light source for generating composite light, comprising a driving circuit and further comprising: a control unit which controls an output of the drive circuit; the white light LED is connected with the driving circuit; the plurality of monochromatic light LEDs are connected with the driving circuit; the spectrometer is connected with the control unit and is used for measuring optical parameters of the white light LED, the monochromatic light LED and the composite light; the monochromatic light LED includes: blue LEDs, pure green LEDs, emerald green LEDs, amber LEDs, and orange-red LEDs.

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.

Preferably, the wavelengths of the monochromatic light 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. 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.

Preferably, the device further comprises a temperature sensor, and the temperature sensor is connected with the control unit. The working state of the LED can be judged according to the detected temperature when necessary, and the detected temperature can be used as a reference for LED control or only used for state monitoring.

The technical scheme also comprises a full-color LED composite method, which is used for the full-color LED composite light source and comprises 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:

when K (L1 × L1 ″ + L2 × L2 ″ + … L6 × L6 ″) obtains the luminous flux coefficient K according to known parameters, the actual luminous flux of the white LED is K × L1 × L1 ″, the actual luminous flux of the blue LED is K × L2 × L2 ″, and so on, and the actual luminous fluxes of the pure green LED, the emerald green LED, the amber LED and the orange red 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: detecting the current luminous flux of the composite light, and comparing the current luminous flux with the error range of the set luminous flux; if the current luminous flux is smaller than the preset error range, synchronously improving the luminous flux of each LED in the effective block containing the white light LED; and if the current luminous flux is larger than the preset error range, synchronously reducing the luminous flux of each LED in the effective block containing the white light LED, wherein the required proportion of each LED in the corresponding effective block is unchanged in the increasing and reducing processes, and if the current luminous flux is larger than or equal to the minimum value of the error range and smaller than or equal to the maximum value of the error range, the current luminous flux is not adjusted. In the actual working process, the conditions such as humidity, temperature or current can affect the light emission of the LED to a certain extent, so that the brightness of the composite light changes to a certain extent, or when the brightness of the composite light needs to be actively adjusted, the effective block where the white light LED is located is preferentially and synchronously adjusted, so that the calculated amount can be reduced, the influence on the color coordinate of the composite light is reduced, and the accuracy is increased.

Preferably, in the brightness correction process, if the brightness is not corrected when the adjustment of the effective block including the white light LED reaches the maximum or minimum adjustment limit, the luminous fluxes of the LEDs in the other effective blocks are synchronously adjusted in the same manner until the current luminous flux is greater than or equal to the minimum error range value and less than or equal to the maximum error range value, or each effective block is adjusted to the maximum or minimum adjustment limit, and the adjustment is stopped. When only the effective block where the white light LED is located is adjusted in the brightness correction, and the correction cannot be realized, other effective blocks are adjusted. Finally, the complete adjustment of the brightness is realized.

The substantial effects of the invention include: the LED white light source color rendering index control system has the advantages of simple structure, small composite calculated amount, accurate composite, convenient adjustment, color gamut range larger than or equal to 90%, white light source color rendering index Ra larger than or equal to 98, R1-R15 larger than or equal to 90, and capability of adapting to lighting requirements in more fields.

Drawings

FIG. 1 is a schematic diagram of a composite light source according to the present embodiment;

FIG. 2 is a schematic diagram of a driving circuit of the present embodiment;

FIG. 3 is a color gamut diagram of the present embodiment;

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.

Fig. 1 shows a full-color LED composite light source for generating composite light, which includes a driving circuit 2; 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; 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; and the temperature sensor 6 is connected with the control unit 1. The working state of the LED can be judged according to the detected temperature when necessary, and the LED works under the influence of overhigh or overlow temperature.

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 are consistent.

The color temperature of the white LED of the embodiment is 4200K.

The color and wavelength of the monochromatic light LED of this embodiment are respectively: 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 present embodiment comprises a plurality of identical composite light sources as described above. 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; meanwhile, the color gamut range capable of being displayed is also an important parameter of modern lighting or display devices, many colors are not contained in natural light, and the color gamut range cannot be improved only by simulating sunlight.

The embodiment also comprises a full-color LED composite method, which is used for the full-color LED composite light source and comprises 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:

The process of step S05 includes: adding the required proportion of each LED in the required proportion of the groups of the effective blocks separately, namely adding the required proportion of the groups l1 'to obtain an actual proportion l 1', adding the required proportion of the groups l2 'to obtain an actual proportion l 2', and adding the required proportion of the 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.

After step S05 is completed, brightness correction is also included, including the following steps: detecting the current luminous flux of the composite light, and comparing the current luminous flux with the error range of the set luminous flux; if the current luminous flux is smaller than the preset error range, synchronously improving the luminous flux of each LED in the effective block containing the white light LED; and if the current luminous flux is larger than the preset error range, synchronously reducing the luminous flux of each LED in the effective block containing the white light LED, wherein the required proportion of each LED in the corresponding effective block is unchanged in the increasing and reducing processes, and if the current luminous flux is larger than or equal to the minimum value of the error range and smaller than or equal to the maximum value of the error range, the current luminous flux is not adjusted. In the actual working process, the conditions such as humidity, temperature or current can affect the light emission of the LED to a certain extent, so that the brightness of the composite light changes to a certain extent, or when the brightness of the composite light needs to be actively adjusted, the effective block where the white light LED is located is preferentially and synchronously adjusted, so that the calculated amount can be reduced, the influence on the color coordinate of the composite light is reduced, and the accuracy is increased.

In addition, in the brightness correction process, if the brightness is not corrected when the adjustment of the effective blocks containing the white light LEDs reaches the maximum or minimum adjustment limit, the luminous flux of each LED in the other effective blocks is synchronously adjusted in the same way until the current luminous flux is more than or equal to the minimum of the error range and less than or equal to the maximum of the error range, or each effective block is adjusted to the maximum or minimum adjustment limit, and the adjustment is stopped. When only the effective block where the white light LED is located is adjusted in the brightness correction, and the correction cannot be realized, other effective blocks are adjusted. Finally, the complete adjustment of the brightness is realized.

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

1. A full-color LED composite light source for generating composite light comprises a driving circuit and is characterized by further comprising:

a control unit which controls an output of the drive circuit;

the white light LED is connected with the driving circuit;

the plurality of monochromatic light LEDs are connected with the driving circuit;

the spectrometer is connected with the control unit and is used for measuring optical parameters of the white light LED, the monochromatic light LED and the composite light;

the monochromatic light LED includes: a blue light LED, a pure green light LED, a emerald green light LED, an amber light LED, and an orange-red light LED;

the light recombination process of the composite light source comprises 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: 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 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;

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:

2. The composite full-color LED light source as claimed in claim 1, wherein the color temperature of the white LED is 4200K ± 150K.

3. The full-color LED composite light source according to claim 1 or 2, wherein the wavelengths of the monochromatic LEDs are respectively as follows:

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.

4. The full-color LED composite light source according to claim 1 or 2, characterized by further comprising a temperature sensor, wherein the temperature sensor is connected with the control unit.

5. A full-color LED composite method for the full-color LED composite light source according to claim 1, comprising the steps of:

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: 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;

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 LED composite method according to claim 5, wherein 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.

7. The full-color LED compounding method according to claim 6, wherein the step S05 is completed and further comprises brightness correction, and the method comprises the following steps:

detecting the current luminous flux of the composite light, and comparing the current luminous flux with the error range of the set luminous flux;

if the current luminous flux is smaller than the preset error range, synchronously improving the luminous flux of each LED in the effective block containing the white light LED;

and if the current luminous flux is larger than the preset error range, synchronously reducing the luminous flux of each LED in the effective block containing the white light LED, wherein the required proportion of each LED in the corresponding effective block is unchanged in the increasing and reducing processes, and if the current luminous flux is larger than or equal to the minimum value of the error range and smaller than or equal to the maximum value of the error range, the current luminous flux is not adjusted.

8. The method of claim 7, wherein when the brightness of the effective block containing white LEDs is not corrected during the brightness correction process, if the adjustment of the effective block reaches the maximum or minimum adjustment limit, the light fluxes of the LEDs in the remaining effective blocks are synchronously adjusted in the same manner until the current light flux is greater than or equal to the minimum error range and less than or equal to the maximum error range, or each effective block is adjusted to the maximum or minimum adjustment limit, and the adjustment is stopped.