WO2015007120A1

WO2015007120A1 - Method for adjusting target volume of light source and light source

Info

Publication number: WO2015007120A1
Application number: PCT/CN2014/079430
Authority: WO
Inventors: 张权
Original assignee: 深圳市绎立锐光科技开发有限公司
Priority date: 2013-07-15
Filing date: 2014-06-07
Publication date: 2015-01-22
Also published as: CN104298838A; CN104298838B

Abstract

Disclosed are a method for adjusting the target volume of a light source and the light source. The light source comprises three groups of luminous elements and each group comprises the luminous elements of at least one color; the three groups of luminous elements together comprise the luminous elements of at least four colors, and the luminous elements of the same color are located in the same group of luminous elements. The method comprises the steps of: obtaining target tristimulus values of the light source; obtaining tristimulus values of each group of luminous elements under the maximal luminous flux; considering each group of luminous elements as the luminous elements of one color, calculating the coefficient of adjustment for the luminous flux of each group of color luminous elements according to the target tristimulus values and the respective tristimulus values of the three groups of luminous elements, and normalizing the coefficient of adjustment; and adjusting the luminous fluxes of each group of luminous elements according to the coefficient of adjustment of this group of luminous elements. Therefore, the unique solution to the luminous fluxes of the color luminous elements in the light source with the luminous elements of at least four colors upon arrival at predetermined chromaticity coordinates is simply and readily attained.

Description

Target quantity adjustment method of light source and a light source

Technical field

The present invention relates to the field of illumination and display technologies, and in particular, to a target quantity adjustment method of a light source and a light source. Background technique

LED white light sources have a major impact on the general lighting market. The more commonly used white light sources are R (Red, Red), G (Green, Green), and B (Blue, Blue) trichromatic LEDs that illuminate into white light. In this white light source, all synthetic colors are matched by controlling the input power of the three primary colors of R, G, and B, respectively. Because the three primary color LEDs directly emit light, the color saturation of each monochromatic light is very high, compared with the white light source based on the fluorescent conversion white LED, which satisfies the requirements for bright colors in the stage performance or other occasions, and the color temperature. Adjustable and produces variable color light.

As shown in Fig. 1, Fig. 1 is a schematic diagram of the luminescence spectra of red, green and blue LEDs. Since the high-power trichromatic (R, G, and B) LED light sources have very narrow monochromatic light spectrum and high saturation, when the R, G, and B trichromatic LEDs synthesize white light, the combined light spectrum is discontinuous, in visible light. Some optical components are missing from the range, for example, there is a valley between 480 nm and 600 nm. This results in a lower color rendering of the light source and thus cannot be used as an illumination source. In order to improve the color rendering of the illumination source, the R, G, and B trichromatic LED light sources are insufficiently colored, and at least one other color LED is generally added to the white light source (for example, a white LED, a yellow LED, or an amber LED). ), to avoid the valley phenomenon of the spectrum, improve the color rendering of the light source.

However, in such a white light source having at least four color LEDs, when a certain specific color is to be synthesized from the multi-primary light, the ratio of the luminous fluxes of the light-emitting elements of the respective colors has an array solution. The more colors of the LEDs in the white light source, the more complex the algorithm. Summary of the invention

SUMMARY OF THE INVENTION A technical problem to be solved by the present invention is to provide a target amount adjustment method for a light source, which is intended to relatively easily obtain a unique solution of the luminous flux of each color light-emitting element when a light source having at least four color light-emitting elements reaches a predetermined color coordinate.

Embodiments of the present invention provide a method for adjusting a target amount of a light source, wherein the light source includes three sets of light-emitting elements, each set of light-emitting elements includes light-emitting elements of at least one color, and the light of different colors in each set of light-emitting elements The distance between the wavelengths is not more than 20 nm. The three groups of light-emitting elements comprise at least four light-emitting elements of different colors, and the same-color light-emitting elements are located in the same group of light-emitting elements, including:

Step A: acquiring a target color coordinate (x., y ₀ ) of the light source, and calculating a tristimulus value (X ₀ , Y ₀ , Z ₀ ) of the target color coordinate, where x ₀ = y ₀ χ ( _{0 0} ), ζ ₀ = γ ₀ χ [(ix ₀ -y ₀ y χ ₀ ], and the target color coordinate is within a predetermined range;

Step Β: Obtain the tristimulus values ( , Yt , Zt ) of each group of illuminating elements, where i=l, 2,

3; x Z _u , its

The middle is the blue primary color stimuli of the jth color illuminating element in the i-th group with the largest luminous flux, and Yij is the green primary color stimuli of the jth color illuminating element in the i-th group at the maximum luminous flux thereof, z _i; The amount of red primary color stimuli of the jth color illuminating element in the i-th group when the luminous flux is maximum is the number of colors of the illuminating elements in the i-th group, and is the actual luminous flux of the j-th color illuminating element in the i-th group and its maximum luminous flux. The ratio is called the adjustment factor, and the initial value of / ^ is 1; Step C: obtaining the adjustment coefficient groups of the first, second, and third groups of light-emitting elements (^, κ ₂ ,

Reduce or enlarge K ₂ , ΛΓ ₃ by a predetermined ratio such that the largest one of the three values is greater than or equal to 0.8 and less than or equal to 1;

Step D: Adjust the actual luminous flux of each color illuminating element such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kx . Preferably, the step C and the step D further include:

Step E: Obtaining an influence factor of each color illuminating element in the group whose adjustment coefficient is not 1 on the target quantity of the light source, and saying that all the groups whose adjustment coefficient is not 1 is a group to be adjusted; Step F: at least one influence The adjustment factor of the color illuminating element having a factor greater than 0 is reduced by at least one predetermined step size, and steps B and C are repeated to calculate the final adjustment factor of each group of illuminating elements.

Preferably, the step E includes:

Step E1: Obtain a target quantity of the light source adjusted by the initial value of the adjusted coefficient group (^, K ₂ , Κ ₃ ), and record it as Μ0;

Step Ε2: reducing the adjustment coefficient /^ _{; of} one of the color illuminating elements in the group to be adjusted by a predetermined step size (for example, 0.1 or 0.01), and then repeating steps S22 and S23, and acquiring according to step S23 The new adjustment coefficient group of the three groups of light-emitting elements recalculates the target quantity of the current light source, denoted as Mi, and calculates ΔΜ=Μί -Μ0; repeat this step to calculate the ΔΜ corresponding to each color light-emitting element in the group to be adjusted;

Step Ε3: sorting ΔΜ corresponding to all color illuminating elements in the group to be adjusted from large to small, the ordering is an influence factor of all color illuminating elements in the group to be adjusted, wherein the influence factor of the color illuminating elements with ΔΜ greater than 0 is greater than 0; The adjustment factor /^ of each color illuminating element in the group to be adjusted is increased by one step.

Preferably, the step F is:

The adjustment coefficients of the color illuminating elements having the largest influence factor in the group to be adjusted are sequentially decreased by a predetermined step size until the target amount of the light source stops growing, and the steps Β and C are repeated to calculate the final adjustment coefficient of each group of illuminating elements.

Preferably, the step F includes:

Step Fa: obtaining the adjustment coefficient group (^, K ₂ , Κ ₃ ) calculated by the step C, and calculating a target quantity of the light source adjusted by the adjustment coefficient group, which is recorded as a first target quantity;

Step Fb: searching for the color illuminating element having the largest influence factor among the groups to be adjusted obtained in the step E, and reducing the adjustment coefficient kij by the first predetermined step size Ak1;

Step Fc: repeating the steps B and C to obtain a new adjustment coefficient group of the three groups of light-emitting elements, and calculating a new target quantity of the light source according to the three new adjustment factors, For the second target amount;

Step Fd: calculating a difference between the second target quantity and the first target quantity; if the difference is greater than 0, making the first target quantity equal to the second target quantity, and repeating step Fb to step Fd; if the difference is less than 0 , then proceed to step D.

Preferably, the step F includes:

Step F1: Obtain the adjustment coefficient group (^, K ₂ , Κ ₃ ) calculated by the step C, and calculate a target quantity of the light source adjusted by the adjustment coefficient group, and record it as the first target quantity;

Step F2: searching for the color illuminating element having the largest influence factor in the group to be adjusted obtained in step Ε, and reducing the adjustment coefficient / ^ by the first predetermined step size Ak1;

Step F3: Step B and step C are repeated to obtain a new adjustment coefficient group of the three groups of light-emitting elements, and a new target quantity emitted by the light source is calculated according to the three new adjustment factors, and recorded as a second target quantity;

Step F4: calculating a difference between the second target quantity and the first target quantity; if the difference is greater than 0, making the first target quantity equal to the second target quantity, and repeating step F2 to step F4; if the difference is less than 0 , perform the following steps:

Step F41: making the first target amount equal to the second target amount;

Step F42: Find the color light-emitting element with the largest influence factor in the group to be adjusted obtained in step E, and reduce the adjustment coefficient by a second predetermined step size Ak2, wherein the Ak2 is smaller than Akl;

Step F43: Repeat steps B and C to obtain a new set of adjustment coefficients of the three groups of light-emitting elements, and calculate a new target amount of light emitted by the light source according to the three new adjustment coefficients, which is recorded as a second target quantity;

Step F44: Calculate the difference between the second target quantity and the first target quantity; if the difference is greater than 0, repeat steps F41 to F44; if the difference is less than 0, proceed to step D.

Preferably, the step F includes:

Step F2: searching for the color illuminating element having the largest influence factor among the groups to be adjusted obtained in step Ε, and reducing the adjustment coefficient /^ to the first predetermined step size Ak1; Step F3: Step B and step C are repeated to obtain a new adjustment coefficient group of the three groups of light-emitting elements, and a new target quantity emitted by the light source is calculated according to the three new adjustment factors, and recorded as a second target quantity;

Step F41: making the first target amount equal to the second target amount;

Step F43: Repeat steps B and C to obtain new adjustment coefficient groups of the three groups of light-emitting elements, and calculate a new target quantity of the light source according to the three new adjustment factors, which is recorded as the second target quantity;

Preferably, the step D includes:

Obtaining the current temperature of each of the light-emitting elements, determining a final adjustment coefficient of the luminous flux of each color light-emitting element / 3⁄4 x , and obtaining, from the first mapping table, the luminous flux adjustment coefficient /^ 每种 of each color light-emitting element at the current temperature Input power adjustment factor;

The first mapping table stores the correspondence between the luminous flux adjustment coefficient of each color light-emitting element at different temperatures and the adjustment coefficient of the input power.

Preferably, the tristimulus value of each color light at its maximum luminous flux is pre-stored in the storage unit; in step B, each tristimulus value is obtained from the storage unit;

Detecting a maximum luminous flux of each color light every predetermined time, obtaining a tristimulus value corresponding to the maximum luminous flux from the second mapping table according to the detected maximum luminous flux and tristimating in the storage unit The value is updated;

The second mapping table holds different luminous fluxes and corresponding tristimulus values.

The embodiment of the invention further provides a light source, comprising:

a light emitting device comprising three groups of light emitting elements, each set of light emitting elements comprising at least one color Light-emitting elements, and the distance between the main wavelengths of different color lights in each group of light-emitting elements is not more than 20 nm, the three groups of light-emitting elements collectively comprise at least four light-emitting elements of different colors, and the same color light-emitting elements are located in the same group of light-emitting elements Inside the component;

a control device, configured to acquire a target color coordinate (x., y ₀ ) of the light source, and calculate a tristimulus value (X ₀ , F ₀ , Z.) of the target color coordinate, where X ₀ = y ₀ x ( x ₀ /y ₀ ), Z ₀ =Y ₀ x[(\-x ₀ -y ₀ )/ x ₀ ], and the target color coordinates are within a predetermined range; obtaining tristimulus values of each group of light-emitting elements ( , Y _t , Z _t ), where i=l, 2, 3; such that =^ ^πΐ kij X Xij,

Yi^^ kij X Yij, Z^^ kij X Zij, where ^ is the blue primary color stimuli of the jth color illuminating element in the i-th group with the largest luminous flux, and is the j-th color illuminating element in the i-th group The amount of green primary color stimuli when the luminous flux is maximum is the red primary color stimuli of the jth color illuminating element in the i-th group when the luminous flux is maximum, and is the number of colors of the illuminating elements in the i-th group, which is the jth in the i-th group. An adjustment coefficient of the color light-emitting element, and an initial value of / ^ is 1; obtaining an adjustment coefficient group (^, Κ ₂ , Κ ₃ ) of the first, second, and third groups of light-emitting elements, wherein

And reducing or enlarging 、 ₂ , ΛΓ _{3 in a} predetermined ratio such that the largest one of the three values is greater than or equal to 0.8 and less than or equal to 1; and adjusting the actual luminous flux of each color illuminating element such that each color illuminates The actual luminous flux of the component is its maximum luminous flux X kijx .

Preferably, the control device is further configured to acquire, after adjusting the adjustment coefficient of each group of the light-emitting elements, the actual light flux of each color light-emitting element, and to obtain the light-emitting elements of the respective colors in the group whose adjustment coefficients are not 1 The influence factor of the target quantity, that is, the group whose all adjustment coefficient is not 1 is the group to be adjusted; then the adjustment coefficient of at least one color light-emitting element whose influence factor is greater than 0 is reduced by a predetermined step, and each group of light is recalculated The final adjustment factor of the component.

Preferably, the first group of light emitting elements comprises at least at least blue and deep blue light emitting elements One type;

The second group of illuminating elements comprises at least one of red, orange and amber illuminating elements; the third group of illuminating elements comprises at least one of cyan, green and yellow illuminating elements; preferably, said control means acquires each set of illuminating The adjustment factor of the component is used to determine whether it is 1, before adjusting the actual luminous flux of each color illuminating component.

If not 1, judge whether ΛΓ ₂ is 1 or ΛΓ ₃ is 1, if yes, it ends; if not, then the color coordinates in the group whose adjustment coefficient is not 1 in the second and third groups is the target of the light source The adjustment coefficient of the color illuminating element having the farthest color coordinate is gradually reduced by a predetermined step, until the adjustment coefficient of the group is greater than a predetermined threshold, ending the cycle;

If ^ is 1, obtaining an influence factor of each color illuminating element in the second group and the third group, and reducing an adjustment coefficient of at least one color illuminating element having an influence factor greater than 0 by a predetermined step size until the color illuminating element is When the adjustment coefficient is 0 or the adjustment coefficient of the second group or the third group is 1, the loop ends.

Preferably, the light source further includes first detecting means for detecting the temperature of each of the color light-emitting elements, and transmitting the temperature to the control device;

The control device finally adjusts the coefficient kij x Ki according to the acquired temperature and the luminous flux of each color light-emitting element, and obtains the input power corresponding to the luminous flux adjustment coefficient X of each color light-emitting element at the current temperature from the first mapping table. Adjustment factor, and adjusting the input power of each color light-emitting element such that the actual input power of each color light-emitting element is an adjustment factor of its maximum input power X input power;

The first mapping table stores a correspondence relationship between a luminous flux adjustment coefficient at different temperatures of each color light-emitting element and an adjustment coefficient of the input power.

Preferably, the control device pre-stores a tristimulus value of each color light at its maximum luminous flux;

The light source further includes second detecting means for detecting a maximum luminous flux of each color light every predetermined time, and acquiring, corresponding to the maximum luminous flux, from the second mapping table according to the detected maximum luminous fluxes a tristimulus value, and updating the tristimulus value of each color light in the memory of the control device at its maximum luminous flux; The second mapping table holds different luminous fluxes of each color illuminating element and tristimulus values corresponding thereto.

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, when the light source has at least four color light-emitting elements, by dividing at least four color light-emitting elements into three groups, wherein the light-emitting elements of similar colors are grouped into the same group, and each color light-emitting element in each group is A color light-emitting element is used to adjust its luminous flux to obtain a unique solution of the luminous flux of each group of light-emitting elements when the light source has a predetermined color coordinate. DRAWINGS

Figure 1 is a schematic diagram of the spectrum of red, green and blue LEDs;

2 is a schematic flow chart showing an embodiment of a method for adjusting a target amount of a light source according to the present invention;

3 is a schematic structural view showing an embodiment of a light source in a method of adjusting a target amount of a light source according to the present invention;

Figure 4 is the color coordinates of the chromaticity diagram and the eight color LEDs in the light source shown in Figure 3, respectively, when their luminous flux is maximum;

Figure 5 is a schematic flow chart showing still another embodiment of the method for adjusting the target amount of the light source of the present invention;

6 is a schematic flow chart of an embodiment of step S24 in the embodiment shown in FIG. 5. FIG. 7 is a schematic flowchart of an embodiment of step S25 in the embodiment shown in FIG. 5. FIG. FIG. 9 is a schematic flow chart of still another embodiment of a method for adjusting a target quantity of a light source according to the present invention; FIG.

Figure 10 is a graph showing the relationship between the input power of an LED and its luminous flux at a certain temperature; Figure 11 is a block diagram showing a further embodiment of the light source of the present invention. detailed description

The embodiments of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

Embodiment 1 Please refer to FIG. 2. FIG. 2 is a schematic flow chart of an embodiment of a method for adjusting a target amount of a light source according to the present invention. As shown in FIG. 2, this embodiment includes:

Step S11. Acquire a target color coordinate (x., y ₀ ) of the light source, and calculate a tristimulus value of the target color coordinate. , Y ₀ , Ζ ₀ ), where ₀ =^ >< ( ₀ / / ₀ ), Z ₀ =Y ₀ x [(\-x ₀ -y ₀ )/ χ ₀ ] , and the target color coordinate is in the predetermined range Inside.

As shown in FIG. 3, FIG. 3 is a schematic structural view of an embodiment of a light source in a method for adjusting a target amount of a light source according to the present invention. The light source includes a light-emitting device 11, a fly-eye lens pair 7, a condenser lens 8, and a control device (not shown).

The light-emitting device 11 includes a cross-shaped dichroic color patch 5, and three optical channels respectively located on three sides of the cross-shaped dichroic color patch 5, and the first light-emitting element arrays 1 and 2 are respectively disposed in the three optical channels. The light emitting element array 2 and the third light emitting element array 3. The first light-emitting element array 1 includes a blue LED and a deep blue LED, the second light-emitting element array 2 includes a cyan LED, a green LED, and a yellow LED, and the third light-emitting element array 3 includes an orange LED, an amber LED, and a red LED. The three light-emitting element arrays emit light through the cross-shaped dichroic film 5 to form a bundle of white light and are incident on the fly-eye lens pair 7 to be hooked. The white light that has been hooked by the fly-eye lens pair 7 is concentrated by the converging lens 8 onto the target plane 9.

Since the illuminating device (including the number of LEDs of each color and the optical path structure, parameters, etc.) is determined, when all the LEDs in the illuminating device are turned on and the luminous flux of each LED reaches a maximum, The luminous flux of the white light emitted by the illuminating device is maximized, and the color coordinate of the white light is a certain value.

However, in practical use, when the white light emitted by the light-emitting device reaches its maximum luminous flux, the color coordinate of the white light is not necessarily the color coordinate of the white light actually needed. Therefore, the control device acquires the actually required white light color coordinates (x., y.), and adjusts the input power of each color according to the color coordinates, thereby changing the luminous flux of the different color lights to change the ratio between the different color lights. The purpose of finally achieving the target color coordinates is to make the emitted white light. The target color coordinate may be stored in the storage unit in advance, and may be acquired from the storage unit when needed, or may be User input in real time. Since the color temperature and the color coordinate are corresponding to each other, it is also possible to store a mapping table in the storage unit in advance, and the mapping table has a correspondence relationship between color temperature and color coordinates. In this way, the user can also input the color temperature in real time, and the control device finds the corresponding color coordinate in the mapping table according to the received color temperature.

It should be noted that after obtaining a certain light source, not all color coordinates can be obtained by adjusting the luminous flux of the LEDs of each color in the light source. As shown in Fig. 4, Fig. 4 is the color coordinate of the chromaticity diagram and the eight color LEDs in the light source shown in Fig. 3 when their luminous flux is maximum. It is known from colorimetry that the color coordinates 41 of the combined light at the maximum luminous flux of the eight color lights are within the range enclosed by the frame 401 surrounded by the eight points in Fig. 4 . Even if the luminous flux of each color light is adjusted to change the luminous flux ratio of the eight color lights to change the color coordinates of the combined light of the eight color lights, the color coordinates of the combined light will only move within the frame 401.

Therefore, the input target color coordinates need to be within the range enclosed by the frame 401. In actual use, a judging step may be added before the step to determine whether the target color coordinate is within a predetermined range, and if not, prompt the user and re-enter.

When the target color coordinate is acquired, according to the colorimetric, the tristimulus value (X., F ₀ , Z ₀ ) can be calculated according to the target color coordinate, so that Χ. =ν. χ ( x./y. ),

Step illuminator ( , i=l,

2, 3 ; x Z _u ,

Wherein, the blue primary color stimuli of the jth color illuminating element in the i-th group when the luminous flux is maximum is the green primary color stimulating amount of the j-th color illuminating element in the i-th group when the luminous flux is maximum, which is the i-th group The amount of red primary color stimuli of the j-th color illuminating element when the luminous flux is maximum is the number of colors of the il group of the i-th group, and is the adjustment coefficient of the j-th color illuminating element in the i-th group, and the initial value is 1 .

In this embodiment, the eight color light-emitting elements in the light-emitting device are divided into three groups of light-emitting elements, wherein each color of each group of light-emitting elements is similar, and specifically represents a dominant wavelength of light of different colors in each group of light-emitting elements. The distance between them is not more than 20 nm. In this embodiment, the first, second, and third illuminating element arrays in the illuminating device are respectively the first, second, and third groups of illuminating Component.

When the luminous flux of the white light emitted by the illuminating device reaches a maximum, that is, the luminous flux of each color LED reaches a maximum, the tristimulus value of the blue LED is (J3⁄4, Y _b , Z _b ), and the tristimulus value of the dark blue LED For ( ^ ^, Υ ^, Ζ ^ ), the tristimulus value of the cyan LED is (X _c , , Z _C ), the tristimulus value of the green LED is ( , Y _g , Z _g ), and the tristimulus value of the yellow LED For (X _y , Y _y , Z _y ), the tristimulus value of the orange LED is (X., Y ₀ , Ζ.), the tristimulus value of the amber LED is X _a , Y _a , Ζ _α ), red LED The tristimulus values are (X _r , Y _r , Z _r ). These values can be pre-measured and stored in the storage unit, and the control device then retrieves from the storage unit.

It is known from colorimetry that the tristimulus values of the respective color lights are proportional to the luminous flux of the color light. The luminous flux of one color light is related to the input power of the color light emitting element. When the input power is maximum, the luminous flux of the color light reaches its maximum value. When the input power is less than its maximum value, the luminous flux of the color light is less than its maximum value, and the ratio of the luminous flux to its maximum value is k. Thus, the amount of blue primary color stimuli per color light is / χ _; · where _{ί ί;} · is the amount of red primary color stimuli of the color light when its luminous flux reaches a maximum. Similarly, the actual green primary color stimulus of each color light is /3⁄4 χ ·, and the actual red primary color stimulus is χζ _ί; Since the luminous flux of the color light is proportional to the input power of the color LED, / ^ is also the ratio of the actual input power of the color LED to the maximum input power, which is called an adjustment factor.

Set the initial value of /^ _; of each color LED to 1, that is, the input power of each color LED is the maximum value, then the initial tristimulus values of the first group of light-emitting elements are (J^, Υ, Ζ), X Xb+X , Y^Yb+Ydb, Z =Z _b ^Z _dba , the initial tristimulus values of the second group of light-emitting elements are ₂ , Y ₂ , Z ₂ ), where X ₂ =X _C + +X _y , Y ₂ =Y _C + Yg+Yy, Z ₂ =Z _C +Zg+Z _y ; The initial tristimulus values of the third group of illuminating elements are (Χ ₃ , Υ ₃ , Ζ ₃ ), where Χ ₃ = Χ . +Χ _α +^, Thus, in the following adjustment process, each group of light-emitting elements is regarded as a light-emitting element of one color, that is, each color LED of the first group of light-emitting elements is regarded as a blue LED, wherein the blue LED The initial tristimulus value is (4, Y, Z); each color LED of the second group of light-emitting elements is regarded as a green LED, wherein the initial tristimulus value of the green LED is (X ₂ , , Z ₂ ); Each color LED of each of the three groups of light-emitting elements is regarded as a red LED, wherein the red LED The initial tristimulus values are (Χ ₃ , Υ ₃ , ζ ₃ ). Step S13: Acquire an adjustment coefficient group of the first, second, and third groups of light-emitting elements (K, Κ-

Normalize K ₂ and ΛΓ ₃ .

Since the three groups of light-emitting elements in the light-emitting device are respectively regarded as three-color light-emitting elements, the adjustment coefficients of the three color lights can be calculated based on the target three-stimulus values and the initial three-stimulus values of the three color lights.

Specifically, the adjustment coefficients of the first, second, and third groups of light-emitting elements are respectively ΑΓ ₂ , ΑΓ ₃ (that is, the luminous fluxes of all the LEDs in the first, second, and third groups of light-emitting elements are respectively maximum luminous fluxes , Κ ₂ , ΛΓ ₃ times, ), according to colorimetry,

ZK + Z ₂ K ₂ + Z ₃ K ₃ = Z ₀₀ ( 3 )

Thanks to x. , y. , z. The ratio is known, so that a unique solution of the ratio of κ ₂ : ΛΓ ₃ can be obtained. Of course, the three values in the unique solution may be greater than 1 or less than 1.

According to the colorimetric, when the ratio of the luminous flux of the three color lights is constant, even if the specific value of the luminous flux of the three color lights is changed, the color coordinates of the combined light of the three color lights do not change. The adjustment coefficients of each group of light-emitting elements need to be less than 1 and greater than 0. Therefore, Κ ₂ and ΛΓ ₃ calculated according to the above equation need to further reduce or enlarge the three values by a predetermined ratio, so that the three values are The largest one is no more than 1. In this embodiment, the three values are normalized such that the largest one of the three values is equal to one. Thus, the luminous flux of all color LEDs in the set of optical elements corresponding to the adjustment factor equal to 1 is maximized. Of course, in practice, the largest one of the three values may not be equal to 1, as long as the largest one is greater than or equal to 0.8 and not greater than 1, the luminous flux of the entire illuminating device may be brought to a larger value. For convenience of description, in the examples below, the largest one of the three values is equal to one. Step S14: Adjust the actual luminous flux of each color illuminating element such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kij x .

After calculating the adjustment coefficients of each group of light-emitting elements, it is determined that the final adjustment coefficient of each color light-emitting element is its adjustment coefficient /^ _; multiplied by the adjustment coefficient Ki of the group of the color light-emitting elements. In the present embodiment, since the initial value of the adjustment coefficient of each color light-emitting element is 1, and there is no change in the subsequent calculation, the final adjustment coefficient of each color light-emitting element is Ki.

It can be seen from the above that the luminous flux of each color illuminating element is proportional to the input power of the color illuminating element, and therefore, the control device is used to adjust the input power of each illuminating element such that the actual input power of the color illuminating element is at its maximum The input power X kij x Κ _{ is such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kij x .

In this embodiment, by dividing the eight color LEDs into three groups and using each group of light-emitting elements as one-color light-emitting elements, it is relatively easy to calculate the specific input power of each color light-emitting element according to the target color coordinates. The whole process is simple and convenient.

The eight color lights in the light-emitting device in actual use are not limited to the eight color lights described in the above embodiments, and may be other colors. Moreover, the number of colors of the light-emitting elements included in the light-emitting device may not be eight, but other numbers; as long as the number of colors is not less than four, the light flux between the color-emitting elements corresponding to the same target color coordinate is matched. The ratio has an infinite number of solutions, so that the method described in the above embodiments can be used to obtain a unique solution of the ratio of the luminous flux between the respective color light-emitting elements, thereby obtaining the specific power driving value of each color light-emitting element. .

In actual use, the specific structure of the light-emitting device may be other structures, and is not limited to the structure of the light-emitting device shown in Fig. 3, and the above-described method may be employed as long as the light-emitting device includes at least four color light-emitting elements. Further, the respective color light-emitting elements of the same group of light-emitting elements may not be placed together, as long as the light-emitting elements of the respective color light-emitting elements can emit light. For convenience of description, the following embodiments are exemplified by the light-emitting device shown in Fig. 3.

Embodiment 2

One of the embodiments provides a method of quickly obtaining a ratio of light-emitting elements of respective colors according to target color coordinates. When the number of colors of the light-emitting elements included in the light-emitting device is greater than or equal to 4, the ratio of the light of each color in the light source corresponding to the same color coordinate emitted by the light source is There are a lot of solutions, and in this infinite solution, there is a ratio that maximizes the target amount of light emitted by the light source (for convenience of description, hereinafter referred to as the target amount of the light source). The target amount can be the luminous flux of the light source, or the color rendering index, or other indicators. However, the target amount of the light source corresponding to the ratio between the respective color light-emitting elements obtained according to the method described in the first embodiment is still at a certain distance from the maximum target amount. Therefore, the input power of the partial color light-emitting elements in the light source can be adjusted on the basis of the first embodiment, so as not to change, please refer to FIG. 5. FIG. 5 is still another implementation of the method for adjusting the target quantity of the light source of the present invention. The flow chart of the example. As shown in FIG. 5, this embodiment includes:

Step S21. Obtain a target color coordinate (x., y ₀ ) of the light source, and calculate a tristimulus value of the target color coordinate. , Y ₀ , Ζ ₀ ), where ₀ =^>< ( ₀ // ₀ ), Z ₀ =Y ₀ x[(\-x ₀ -y ₀ )/ χ ₀ ], and the target color coordinate is in the predetermined range Inside.

Step S22. Acquire tristimulus values ( , Yt, Zt ) of each group of light-emitting elements, where i=l,

2, 3; x Z _u ,

Wherein, the amount of the blue primary color stimuli of the jth color illuminating element having the largest luminous flux in the i-th group is the green primary color stimulating amount of the j-th color illuminating element in the i-th group when the luminous flux is maximum, Zij is the i-th group The amount of red primary color stimuli of the j-th color illuminating element when the luminous flux is maximum is the number of colors of the il group of the i-th group, and is the adjustment coefficient of the j-th color illuminating element in the i-th group, and the initial value of /^ 1. Step S23. Acquire the first, second and third groups of the adjustment coefficients set of light emitting element (K, K _2,

Κ·2, 3 normalized.

For the description of steps S21 to S23, refer to the description of steps S11 to S13.

Step S24: Acquire an influence factor of the light-emitting elements of each color in the group whose adjustment coefficients are not 1 to the target quantity of the light source, and call the group whose all adjustment coefficients are not 1 to be the group to be adjusted. In step S23, the calculated maximum value of Κ ₂ and ΛΓ ₃ after normalization is 1, that is, the luminous flux of each color light-emitting element in the group corresponding to the maximum value reaches a maximum value. Therefore, by increasing the luminous flux of the light source by adjusting the luminous flux of a part of the light-emitting elements in the light-emitting device, it is only possible to adjust the luminous flux of some of the color-emitting elements in the group in which the adjustment coefficient is not 1.

As can be seen from the description in the first embodiment, the adjustment coefficients of the above three groups are calculated when the luminous flux of each color illuminating element is its initial value (ie, the maximum value), and then the adjustment coefficients of the three groups are further determined. Apply to each group separately. Then, it is easy to understand that when the initial value of the luminous flux of the partial color light in the group to be adjusted is lowered, the adjustment coefficients of the three groups are changed, and the target amount of the light source obtained after recalculating according to the three new adjustment coefficients is also Will change. If a specific one of the color light-emitting elements in the adjustment group is to be lowered, the initial value of the light flux of the color light is lowered, and the target amount of the light source is increased, and the influence factor of the color light-emitting element on the target quantity of the light source is greater than 0, and vice versa. Less than 0. In the case where the light flux of each of the color light-emitting elements is decreased by the same ratio, the influence factor of the corresponding color light-emitting element having a larger target amount of the light source is larger.

In this embodiment, the influence factor of each color illuminating element on the target quantity of the light source only needs to be sorted by the magnitude of the influence of the initial value of the luminous flux of each color light on the target amount of the light source when the same amplitude is lowered. It is easy to understand that the influence factors of the respective color illuminating elements are different under different target color coordinates.

In practice, these data can be measured in advance and stored as a mapping table in the storage unit. The control device in the light source only finds the influence factor of each color light-emitting element in the group to be adjusted in the mapping table according to the target color coordinate or the target color temperature acquired in step S21.

Of course, these data can also be measured in real time. Specifically, as shown in FIG. 6, FIG. 6 is a schematic flowchart of an embodiment of step S24 in the embodiment shown in FIG. 5. Step S24 includes:

Step S241: Acquire a target amount of the light source whose initial value is adjusted by the adjustment coefficient group (^, Κ ₂ , Κ ₃ ), and record it as Μ0.

Step S242: reducing the adjustment coefficient of one of the color light-emitting elements in the group to be adjusted by a predetermined step size (for example, 0.1 or 0.01), and then repeating steps S22 and S23, Then, according to the new adjustment coefficient group of the three sets of light-emitting elements acquired in step S23, the target quantity of the current light source is recalculated, denoted as Mi, and ΔΜ=Μί -Μ0 is calculated; the step is repeated to emit each color in the group to be adjusted. The ΔΜ corresponding to the component is calculated;

Step S243: Sorting ΔΜ corresponding to all color illuminating elements in the group to be adjusted from large to small, the ordering is an influence factor of all color illuminating elements in the group to be adjusted, wherein the influence factor of the color illuminating elements with ΔΜ greater than 0 is greater than 0; The adjustment factor 1⁄2 of each color illuminating element in the group to be adjusted is increased by one step.

Since the adjustment coefficient of each color light-emitting element is reduced only to measure the influence factor thereof, the adjustment coefficient of each color light-emitting element in the group to be adjusted is restored after the measurement, so that the adjustment coefficient of each color light-emitting element is increased by one step. To avoid affecting the target color coordinates of the light source.

Step S25: sequentially decreasing the adjustment coefficient of the color light-emitting element with the largest influence factor in the group to be adjusted to a predetermined step size until the target amount of the light source stops growing, and repeating steps S22 and S23 to calculate the final adjustment of each group of light-emitting elements. coefficient.

Specifically, as shown in FIG. 7, FIG. 7 is a schematic flowchart of an embodiment of step S25 in the embodiment shown in FIG. 5. Step S25 includes the following steps:

Step S251: Obtain the adjustment coefficient group (Κ Κ ₂ , Κ ₃ ) calculated by step S23, and calculate the target quantity of the light source adjusted by the adjustment coefficient group, and record it as the first target quantity;

Step S252: Find the color light-emitting element with the largest influence factor in the group to be adjusted obtained in step S24, and reduce the adjustment coefficient (initial value 1) by the first predetermined step size Ak1 (for example, 0.1);

Step S253: Steps S22 and S23 are repeated to obtain a new set of adjustment coefficients of the three groups of light-emitting elements, and a new target amount of light emitted by the light source is calculated according to the three new adjustment coefficients, and is recorded as a second target amount;

Step S254: calculating a difference between the second target amount and the first target amount; if the difference is greater than 0, making the first target amount equal to the second target amount, and repeating steps S252 to S254; if the difference is less than 0 Then, proceed to step S26.

Step S26: Adjust the actual luminous flux of each color illuminating element such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kij x Ki. After finalizing the adjustment factor of each color illuminating element and the adjustment coefficient of each group of illuminating elements, the final luminous flux of each color illuminating element is its maximum luminous flux.

Thus, the input power of the color illuminating element is its maximum input power x ktj XK^

In this way, the adjustment factor of the color illuminating element with the largest influence factor among the groups whose adjustment coefficients are not 1 is lowered to greatly increase the target amount of the light source.

In practice, the adjustment factor of the color light-emitting element with the largest influence factor may not be successively reduced until the target amount of the light source stops growing. As long as the target amount of the light source can be reduced at least once, the target amount of the light source can be compared with that in the first embodiment. Bigger.

Of course, in actual use, in step S25, the adjustment coefficient of the color light-emitting element having the largest influence factor may not be lowered, or the adjustment coefficient of the color light-emitting element having other influence factors greater than 0 may be lowered, so that although the target amount of the light source rises. The amplitude becomes smaller, but the target amount of the light source in the first embodiment is still increased. Preferably, after successively reducing the adjustment coefficient of the color light-emitting element having the largest influence factor until the target amount of the light source stops rising, the adjustment coefficient of the color light-emitting element having at least one other influence factor greater than 0 may be further successively reduced. Based on the further increase of the target amount of the light source.

Preferably, as shown in FIG. 8, FIG. 8 is a schematic flow chart of an embodiment of step S254 in the embodiment shown in FIG. Step S254 specifically includes:

Step S2541: Calculate a difference between the second target quantity and the first target quantity; if the difference is greater than 0, repeat steps S251 to S254; if the difference is less than 0, perform the following steps: Step S2542: Make the first target The amount is equal to the second target amount.

Step S2543: Find the color light-emitting element with the largest influence factor in the group to be adjusted acquired in step S24, and reduce the adjustment coefficient /3⁄4 (initial value of 1) by the second predetermined step Ak2, wherein the Ak2 is smaller than Ak1 (eg Akl=0.1, Ak2=0.01);

Step S2544: Step S22 and step S23 are repeated to obtain a new adjustment coefficient group of three groups of light-emitting elements, and a new target quantity emitted by the light source is calculated according to the three new adjustment factors, and recorded as a second target quantity;

Step S2545: Calculate a difference between the second target quantity and the first target quantity; if the difference is greater than 0, repeat step S2542 to step S2545; if the difference is less than 0, proceed to step S26.

Thus, by adjusting the step size, the target amount of the light source can be further increased. Embodiment 3

This embodiment will provide another method for improving the target amount of the light source obtained by the method described in the first embodiment, which is different from the second embodiment. The details are as follows.

Referring to FIG. 9, FIG. 9 is a flow chart showing still another embodiment of a method for adjusting a target amount of a light source according to the present invention. As shown in FIG. 9, this embodiment includes:

Step S31. Acquire a target color coordinate (x., y ₀ ) of the light source, and calculate a tristimulus value of the target color coordinate. , Y ₀ , Ζ ₀ ), where ₀ =^>< ( ₀ // ₀ ), Z ₀ =Y ₀ x[(\-x ₀ -y ₀ )/ χ ₀ ], and the target color coordinate is in the predetermined range Inside.

Step illuminator ( , i=l,

2, 3; xZ _u ,

Wherein, the amount of the blue primary color stimuli of the jth color illuminating element having the largest luminous flux in the i-th group is the green primary color stimulating amount of the j-th color illuminating element in the i-th group when the luminous flux is maximum, Zij is the i-th group The amount of red primary color stimuli of the j-th color illuminating element when the luminous flux is maximum is the number of colors of the il group of the i-th group, and is the adjustment coefficient of the j-th color illuminating element in the i-th group, and the initial value of /^ 1. Step S33. Acquire the first, second and third groups of the adjustment coefficients set of light emitting element (K, K _2,

,

Normalize K ₂ and ΛΓ ₃ .

For the description of steps S31 to S33, refer to the description of steps S11 to S13.

Step S34. Judging whether it is 1:

If not 1, it is judged whether ΛΓ ₂ is 1 or ΛΓ ₃ is 1, if yes, proceed to step S35; if not, then to the color coordinate distance source in the group whose adjustment coefficient is not 1 in the second and third groups The adjustment coefficient of the color illuminating element having the farthest target color coordinate is reduced by a predetermined step size until the adjustment coefficient of the group is greater than the predetermined threshold, and the process proceeds to step S35.

If ^ is 1, the influence factors of each color illuminating element in the second group and the third group are obtained, The adjustment coefficient of the at least one color illuminating element having an influence factor greater than 0 is successively decreased by a predetermined step size until the adjustment coefficient of the color illuminating element is 0 or the adjustment coefficient of the second group or the third group is 1, and the step S35 is continued.

Step S35. Adjust the actual luminous flux of each color illuminating element such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kij x .

Specifically, if ^ is 1 and ^ and ^ are not 1, then each color light-emitting element in the third group is calculated, and the adjustment coefficient of the color light-emitting element is reduced by a predetermined step size, and then according to step S32 and Step S33 calculates the adjustment coefficients of the first, second, and third groups. If the third set of adjustment coefficients is less than the predetermined threshold, the adjustment coefficient of the color illuminating element is again decreased by a predetermined step size, and then the adjustment coefficients of the first, second, and third groups are calculated according to steps S32 and S33. Thus, until the adjustment coefficient of the third group is detected to be greater than the predetermined threshold, then the calculated Κ ₂ , ΛΓ _{3 are} applied to the light source.

In the description of the above embodiments, it is considered that the luminous flux of one color light is proportional to the input power of the color light-emitting element, so the adjustment coefficient of the luminous flux of each color light-emitting element is recorded as the adjustment coefficient of the input power of the color light-emitting element. . However, in practice, the luminous flux of the illuminating element is not strictly linear with its input power.

For example, as shown in Figure 10, Figure 10 shows the relationship between the input power of an LED and its luminous flux at a certain temperature. As can be seen from the figure, as the input power of the LED increases, the luminous flux of the LED also increases, but the rate of increase is slower. In actual use, the temperature of the LED is different, and the relationship curve will be different. Therefore, in the above embodiments, the actual correspondence relationship may also be used, and the first mapping table is stored, and the adjustment coefficient of the input power of each color light-emitting element in the first mapping table (ie, the actual input power) The ratio of its maximum input power) corresponds to the adjustment factor of the luminous flux (ie, the ratio of the actual luminous flux to its maximum luminous flux).

Then, after finalizing the adjustment coefficient of each group and calculating the final adjustment coefficient of the luminous flux of each color illuminating element is /3⁄4· ,, obtaining the current temperature of each illuminating element, and in the first mapping table by look-up table method Find the actual corresponding color light-emitting elements at the corresponding temperature The adjustment factor of the input power is applied to the light source. In this way, the deviation of the actual color coordinates of the final light source from the target color coordinates can be further reduced.

In the above embodiment, the maximum luminous flux of each color light-emitting element is a fixed value, and therefore the tristimulus values of the maximum luminous flux are both fixed values. However, in practice, the maximum luminous flux of each color illuminating element will gradually decrease with the increase of working time, and the luminous flux of different color illuminating elements will be attenuated to different extents, which will result in the actual color temperature of the light source and the calculated color temperature. deviation.

Therefore, preferably, a second mapping table is stored in the storage unit, and the second mapping table stores different luminous fluxes and tristimulus values corresponding thereto. a detector is further disposed in the light source for detecting the maximum luminous flux of each color illuminating element every predetermined time, and obtaining a tristimulus value corresponding to the maximum luminous flux from the mapping table according to the detected maximum luminous flux, and Each color illuminating element present in the memory cell is updated with a tristimulus value at the maximum of its luminous flux.

Embodiment 4

Please refer to FIG. 11, FIG. 11 is a schematic block diagram of still another embodiment of the light source of the present invention. The light source includes a light emitting device 101 and a control device 102.

The illuminating device 101 includes three groups of illuminating elements, each of which comprises at least one color illuminating element, and the distance between the main wavelengths of the different color lights in each group of illuminating elements is not more than 20 nm, and the three sets of illuminating elements are collectively A light-emitting element comprising at least four different colors, and the same color light-emitting elements are located within the same set of light-emitting elements.

Preferably, the first group of illuminating elements comprises at least one of blue and cyan illuminating elements; the second group of illuminating elements comprises at least one of red, orange and amber illuminating elements; the third set of illuminating elements comprises cyan, green And at least one of the yellow light-emitting elements; the light source comprising at least four of the above eight color light-emitting elements.

The control device 102 is configured to acquire a target color coordinate (x., y ₀ ) of the light source, and calculate a tristimulus value (Χ ₀ , Υ ₀ , Ζ ₀ ) of the target color coordinate, where Χ ₀ = Υο Χ ( x ₀ / y ₀ ), Z ₀ =Y ₀ x [(\ -x ₀ -y ₀ )/ χ ₀ ] , and the target color coordinates are within a predetermined range; obtaining tristimulus values of each group of illuminating elements ( , Y _t , Z _t ), where i=l, 2, 3; such that =^ ^πΐ kij X Xij , Kij X Zij , where ^ is the jth color in the i-th group

The blue primary color stimuli of the optical element having the largest luminous flux are the green primary color stimuli of the jth color illuminating element in the i-th group when the luminous flux is maximum, and the j-th color illuminating element in the i-th group is at the maximum luminous flux thereof. The amount of red primary color stimulus is the number of colors of the light-emitting elements in the i-th group, and is the adjustment coefficient of the j-th color light-emitting element in the i-th group, and the initial value of / ^ is 1; obtaining the first, second, and third a set of adjustment coefficients (^, Κ ₂ , Κ ₃ ) of the group of light-emitting elements, wherein

And reduce, or enlarge, Κ ₂ , ΛΓ _{3 in a} predetermined ratio.

The largest one of the three values is made greater than or equal to 0.8 and less than or equal to 1; and the actual luminous flux of each color illuminating element is adjusted such that the actual luminous flux of each color illuminating element is its maximum luminous flux X kij x .

Preferably, before the adjustment of the adjustment coefficient of each group of the light-emitting elements, the control device 102 adjusts the actual light flux of each color light-emitting element, and is also used to acquire the target quantity of the light source of each color light-emitting element in the group whose adjustment coefficient is not 1. The influence factor, said that all the groups whose adjustment coefficient is not 1 is the group to be adjusted; then the adjustment coefficient of at least one color light-emitting element whose influence factor is greater than 0 is reduced by a predetermined step size, and the final of each group of light-emitting elements is recalculated. Adjustment coefficient.

Preferably, the control device 102 is further configured to determine whether it is 1 before adjusting the actual luminous flux of each color illuminating element after acquiring the adjustment coefficient of each group of illuminating elements, and if not 1: determining whether ΛΓ ₂ is 1 or ΛΓ ₃ If yes, if yes, the adjustment coefficient of the color light-emitting element that is the farthest from the target color coordinate of the light source in the color coordinate of the group whose adjustment coefficient is not 1 in the second and third groups is a predetermined step. Decrease successively until the adjustment coefficient of the group is greater than the predetermined threshold, ending the cycle; if ^ is 1, obtaining the influence factor of each color illuminating element in the second group and the third group, at least one influence factor is greater than 0 The adjustment factor of the color illuminating element is successively decreased by a predetermined step size until the adjustment coefficient of the color illuminating element is 0 or the adjustment coefficient of the second group or the third group is 1, the loop is ended.

Preferably, a first mapping table, the first mapping table, is preset in the control device 102. The correspondence between the luminous flux adjustment coefficient of each color light-emitting element at different temperatures and the adjustment coefficient of the input power is stored. The light source further includes a first detecting means 103 for detecting the temperature of each color illuminating element and transmitting the temperature to the control means 102. The control device 102 obtains the input power corresponding to the luminous flux adjustment coefficient / 每种 of each color light-emitting element at the current temperature from the first mapping table according to the acquired temperature of each color light-emitting element and the final flux adjustment coefficient kij x Ki. The adjustment factor, and adjust the input power of each color illuminating element, so that the actual input power of each color illuminating element is the adjustment factor of its maximum input power X input power.

Preferably, the tristimulus value of each color light at its maximum luminous flux and the second mapping table are pre-stored in the control device 102, wherein the second mapping table stores different luminous fluxes of each color illuminating element and corresponding thereto Tristimulus values. The light source further includes a second detecting device 104, configured to detect a maximum luminous flux of each color light every predetermined time, and obtain three corresponding to the maximum luminous flux from the second mapping table according to the detected maximum luminous fluxes The stimulus value is updated for the tristimulus value of each color light present in the control device at its maximum luminous flux.

The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments can be referred to each other.

Embodiments of the present invention also provide a projection system including a light emitting device, which can have the structure and function in the above embodiments. The projection system can employ various projection technologies, such as liquid crystal display (LCD) projection technology and digital light processor (DLP) projection technology. Further, the above-described illuminating device can also be applied to a lighting system such as stage lighting.

The above description is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation using the specification and the drawings of the present invention may be directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present invention.

Claims

claims

1. A method for adjusting the target amount of a light source, wherein the light source includes three groups of light-emitting elements, each group of light-emitting elements includes at least one color of light-emitting elements, and the main wavelengths of different colors of light in each group of light-emitting elements are between The distance between

Step A: Obtain the target color coordinate (x., y ₀ ) of the light source, and calculate the tristimulus value (X ₀ , Y ₀ , Z ₀ ) of the target color coordinate, where x ₀ =y ₀ χ( _{0 0} ), ζ ₀ =γ ₀ χ [(ix ₀ -y ₀ y χ ₀ ], and the target color coordinate is within the predetermined range;

Step B: Obtain the tristimulus value ( , Yt, Z _t ) of each group of light-emitting elements, where i=1, 2,

3; xZ _u , its

where is the blue primary color stimulation amount of the j-th color light-emitting element in the i-th group when its luminous flux is maximum, Yij is the green primary color stimulation amount of the j-th color light-emitting element in the i-th group when its luminous flux is maximum, z _i; - is The red primary color stimulation amount of the j-th color light-emitting element in the i-th group when its luminous flux is maximum is the number of colors of the j-th color light-emitting element in the i-th group, and is the actual luminous flux of the j-th color light-emitting element in the i-th group and its maximum luminous flux. The ratio is called the adjustment coefficient, and the initial value of / ^ is 1; Step C: Obtain the adjustment coefficient group (^, κ ₂ ,

Reduce or enlarge K ₂ and ΛΓ ₃ according to a predetermined ratio, so that the largest of the three values is greater than or equal to 0.8 and less than or equal to 1; Step D: Adjust the actual luminous flux of each color light-emitting element to make each color emit light. The actual luminous flux of the element is its maximum luminous flux X kx.

2. The method for adjusting the target amount of the light source according to claim 1, wherein the step C and the step D further include:

Step E: Obtain the influence factors of each color light-emitting element on the target amount of the light source in all groups whose adjustment coefficients are not 1, and call the group whose adjustment coefficients are not 1 a group to be adjusted; Step F: At least one influence The adjustment coefficient of the color light-emitting elements with a factor greater than 0 is reduced by at least a predetermined step size, and steps B and C are repeated to calculate the final adjustment coefficient of each group of light-emitting elements.

3. The method for adjusting the target amount of the light source according to claim 2, characterized in that, the step E includes:

Step E1: Obtain the target quantity of the light source adjusted by the initial value of the adjustment coefficient group (^, _K2 , _K3 ), recorded as M0;

Step E2: Decrease the adjustment coefficient / _^ of one of the color light-emitting elements in the group to be adjusted by a predetermined step (for example, 0.1 or 0.01), then repeat steps S22 and S23, and then obtain the The new adjustment coefficient group of the three groups of light-emitting elements recalculates the target amount of the current light source, recorded as Mi, and calculates ΔΜ=Μί-M0; Repeat this step to calculate the ΔΜ corresponding to each color of the light-emitting elements in the group to be adjusted;

Step E3: Sort the ΔM corresponding to all color light-emitting elements in the group to be adjusted from large to small. This sorting is the influence factor of all color light-emitting elements in the group to be adjusted, where the influence factor of the color light-emitting element with ΔM greater than 0 is greater than 0; Increase the adjustment coefficient /^ of each color light-emitting element in the group to be adjusted by one step.

4. The method for adjusting the target amount of the light source according to claim 2, characterized in that, the step F is:

The adjustment coefficient of the color light-emitting element with the largest influence factor in the group to be adjusted is sequentially reduced by a predetermined step until the target amount of the light source stops growing, and steps B and C are repeated to calculate the final adjustment coefficient of each group of light-emitting elements.

5. The method for adjusting the target amount of the light source according to claim 4, characterized in that, the step F includes:

Step Fa: Obtain the adjustment coefficient group (^, _K2 , _K3 ) calculated in step C, and calculate the target amount of the light source adjusted by the adjustment coefficient group, and record it as the first target amount; Step Fb: Find the color light-emitting element with the largest influence factor in the group to be adjusted obtained in step E, and reduce its adjustment coefficient kij by the first predetermined step size Akl;

Step Fc: Repeat steps B and C to obtain a new set of adjustment coefficients for the three groups of light-emitting elements, and calculate a new target amount of light emitted by the light source based on the three new adjustment coefficients, which is recorded as the second target amount;

Step Fd: Calculate the difference between the second target amount and the first target amount; if the difference is greater than 0, make the first target amount equal to the second target amount, and repeat steps Fb to Fd; if the difference is less than 0 , then proceed to step D.

6. The method for adjusting the target amount of the light source according to claim 4, characterized in that the step F includes:

Step F1: Obtain the adjustment coefficient group (^, _K2 , _K3 ) calculated in step C, and calculate the target amount of the light source adjusted by the adjustment coefficient group, and record it as the first target amount;

Step F2: Find the color light-emitting element with the largest influence factor in the group to be adjusted obtained in step E, and reduce its adjustment coefficient / ^ by the first predetermined step size Akl;

Step F3: Repeat steps B and C to obtain a new set of adjustment coefficients for the three groups of light-emitting elements, and calculate a new target amount of light emitted by the light source based on the three new adjustment coefficients, which is recorded as the second target amount;

Step F4: Calculate the difference between the second target amount and the first target amount; if the difference is greater than 0, make the first target amount equal to the second target amount, and repeat steps F2 to F4; if the difference is less than 0 , perform the following steps:

Step F41: Make the first target quantity equal to the second target quantity;

Step F42: Find the color light-emitting element with the largest influence factor in the group to be adjusted obtained in step E, and reduce its adjustment coefficient by a second predetermined step Ak2, where Ak2 is smaller than Akl;

Step F43: Repeat steps B and C to obtain new adjustment coefficient sets of three groups of light-emitting elements, and calculate the new target amount of light emitted by the light source based on the three new adjustment coefficients, which is recorded as the second target amount;

Step F44: Calculate the difference between the second target amount and the first target amount; if the difference is greater than 0, repeat steps F41 to F44; if the difference is less than 0, continue with step D.

7. The method for adjusting the target amount of the light source according to claim 1, characterized in that, in step C, , K ₂ , and ΛΓ ₃ are normalized, and the step C and D further include: G: Determine whether it is 1,

If it is not 1: Determine whether ΛΓ ₂ is 1 or whether ΛΓ ₃ is 1. If yes, continue to step D; if not, calculate the color coordinate distance from the light source in the second and third groups whose adjustment coefficient is not 1. The adjustment coefficient of the color light-emitting element with the farthest target color coordinate is gradually reduced in a predetermined step size, until the adjustment coefficient of the group is greater than the predetermined threshold, continue to step D;

If ^ is 1, obtain the influence factor of each color light-emitting element in the second group and the third group, and gradually reduce the adjustment coefficient of at least one color light-emitting element with an influence factor greater than 0 by a predetermined step until the color light-emitting element When the adjustment coefficient is 0 or the adjustment coefficient of the second or third group is 1, continue to step D.

8. The method for adjusting the target amount of the light source according to any one of claims 1 to 7, characterized in that the step D includes:

Obtain the current temperature of each light-emitting element, determine the final adjustment coefficient / ¾ x of the luminous flux of each color light-emitting element, and obtain from the first mapping table the corresponding luminous flux adjustment coefficient / χ Adjustment coefficient of input power;

The first mapping table stores the corresponding relationship between the luminous flux adjustment coefficient of each color light-emitting element and the adjustment coefficient of the input power at different temperatures.

9. The method for adjusting the target amount of the light source according to any one of claims 1 to 7, characterized in that:

The tristimulus value of each color light at its maximum luminous flux is pre-stored in the storage unit; in step B, each tristimulus value is obtained from the storage unit;

Every predetermined time, the maximum luminous flux of each color light is detected, and the tristimulus value corresponding to the maximum luminous flux is obtained from the second mapping table according to the detected maximum luminous flux and the tristimulus value in the storage unit is value is updated;

The second mapping table stores different luminous fluxes and their corresponding tristimulus values.

10. A light source, characterized in that it includes:

A light-emitting device includes three groups of light-emitting elements, each group of light-emitting elements includes at least one color of light-emitting elements, and the distance between the dominant wavelengths of different colors of light in each group of light-emitting elements is not large. At 20nm, the three groups of light-emitting elements include a total of at least four different colors of light-emitting elements, and the same color light-emitting elements are located in the same group of light-emitting elements;

A control device used to obtain the target color coordinate (x., y ₀ ) of the light source, and calculate the tristimulus value (X ₀ , F ₀ , Z.) of the target color coordinate, where X ₀ = y ₀ x ( x ₀ /y ₀ ), Z ₀ =Y ₀ x[(\-x ₀ -y ₀ )/ x ₀ ], and the target color coordinate is within the predetermined range; obtain the tristimulus value ( , Y _t , Z _t ), where i=l, 2, 3; such that =^ ^πΐ kij x X _t

Υι=^_ kij X Yij, Ζ ^_ kij The green primary color stimulation amount when the luminous flux is maximum is the red primary color stimulation amount of the j-th color luminous element in the i-th group when the luminous flux is maximum, is the color number of the luminous element in the i-th group, is the j-th color light-emitting element in the i-th group Adjustment coefficients of light-emitting elements of three colors, and _the initial value _of /

, and reduce or enlarge K ₂ and ΛΓ ₃ according to a predetermined ratio, so that the largest one of the three values is greater than or equal to 0.8 and less than or equal to 1; and adjust the actual luminous flux of each color light-emitting element to make each color emit light. The actual luminous flux of the element is its maximum luminous flux X kijx.

11. The light source according to claim 10, characterized in that, after obtaining the adjustment coefficients of each group of light-emitting elements and before adjusting the actual luminous flux of each color light-emitting element, the control device is also used to obtain all adjustment coefficients that are not 1. The influence factor of each color light-emitting element in the group on the target amount of the light source is called the group with all adjustment coefficients other than 1 as the group to be adjusted; then the adjustment coefficient of at least one color light-emitting element with an influence factor greater than 0 is calculated as predetermined The step size is reduced, and the final adjustment coefficient of each group of light-emitting elements is recalculated.

12. The light source according to claim 10 or 11, characterized in that the first group of light-emitting elements includes at least one of blue and dark blue light-emitting elements; The second group of light-emitting elements includes at least one of red, orange and amber light-emitting elements; the third group of light-emitting elements includes at least one of cyan, green and yellow light-emitting elements;

13. The light source according to claim 12, wherein the control device is also used to determine whether is 1 before adjusting the actual luminous flux of each color light-emitting element after obtaining the adjustment coefficient of each group of light-emitting elements.

If it is not 1: Determine whether ΛΓ ₂ is 1 or whether ΛΓ ₃ is 1. If so, end; if not, calculate the color coordinate distance from the light source target in the second and third groups whose adjustment coefficient is not 1. The adjustment coefficient of the color light-emitting element with the farthest color coordinate is gradually reduced in a predetermined step size until the adjustment coefficient of the group is greater than the predetermined threshold, and the cycle ends;

If ^ is 1, obtain the influence factor of each color light-emitting element in the second group and the third group, and gradually reduce the adjustment coefficient of at least one color light-emitting element with an influence factor greater than 0 by a predetermined step until the color light-emitting element When the adjustment coefficient is 0 or the adjustment coefficient of the second or third group is 1, the cycle ends.

14. The light source according to claim 10, wherein the light source further includes a first detection device for detecting the temperature of the light-emitting elements of each color and sending the temperature to the control device;

The control device obtains the input power of each color light-emitting element corresponding to its luminous flux adjustment coefficient X at the current temperature from the first mapping table based on the obtained temperature and the final adjustment coefficient kij The adjustment coefficient, and adjust the input power of each color light-emitting element, so that the actual input power of each color light-emitting element is its adjustment coefficient of the maximum input power x input power;

The first mapping table stores the corresponding relationship between the luminous flux adjustment coefficient of each color light-emitting element at different temperatures and the adjustment coefficient of the input power.

15. The light source according to claim 10, characterized in that,

The control device pre-stores the tristimulus value of each color light at its maximum luminous flux;

The light source also includes a second detection device for detecting the maximum luminous flux of each color of light at predetermined intervals, and based on the detected maximum luminous flux from the second mapping table Obtain the tristimulus value corresponding to the maximum luminous flux, and update the tristimulus value of each color light stored in the control device at its maximum luminous flux;

The second mapping table stores different luminous fluxes of the light-emitting elements of each color and their corresponding tristimulus values.