A multi-color LED light mixing method

Abstract

The present invention relates to the field of light mixing technology, and discloses a multi-color LED light mixing method, comprising the following steps: S1, testing basic data; S2, calculating the white balance point: calculating the proportion of each color light of the RGB and WC white balance points respectively according to the basic data, calculating the corresponding controllable current through the relationship between the tested luminous flux and current, and calculating the white balance point; S3, establishing a color mixing model: establishing an underlying color mixing model based on the basic colorimetry and white balance principles, and combining the requirements of the color palette for color mixing, and achieving color mixing by changing the current through calculation; S4, power balance: introducing a power conversion function to achieve saturation changes for different requirements. The present invention proposes a multi-color LED light mixing method, which has more uniform spatial light mixing and better spatial light color consistency; can achieve richer light output effects, and has a significant improvement in brightness; and achieves precise correspondence between the control color palette display and the light output color.

Description

Technical Field

[0001] The present invention relates to the field of light mixing, and in particular to a multi-color LED light mixing method. Background Art

[0002] With the continuous development of LED application technology, people's demand for light quality continues to increase. Many application scenarios require adjustable light color, light intensity, and color temperature, which requires the dimming and color mixing of multiple LED light sources. However, existing LED light mixing technologies mostly use the RGB three-primary color scheme (1) or the three-primary color RGB plus independent warm white and cool white light scheme (2).

[0003] Solution 1: The main problems with the RGB three-color mixing solution are: insufficient brightness without direct participation of white light, insufficient display index when mixing white light, poor power consistency during dimming, and the actual display effect cannot accurately correspond to the color wheel.

[0004] Solution 2: The solution of three primary colors RGB plus independent warm white light and cool white light has the following main problems: the light source is relatively far away, and the uniformity of light mixing in close space is poor; white light and color light are relatively independently controlled, and the structural circuit is complex and cannot be linked as a whole; the power consistency during the dimming process is poor, and the actual display effect cannot accurately correspond to the color wheel.

[0005] To solve the above problems, this application proposes a multi-color LED light mixing method. Summary of the Invention

[0006] (1) Purpose of the invention

[0007] In order to solve the technical problems existing in the background technology, the present invention proposes a multi-color LED mixing method. The present invention has more uniform spatial light mixing and better spatial light color consistency; it can achieve richer light output effects and have a significant improvement in brightness; and it realizes the precise correspondence between the control color disk display and the light output color.

[0008] (2) Technical solution

[0009] To solve the above problems, the present invention provides a multi-color LED light mixing method, comprising the following steps:

[0010] S1. Test basic data;

[0011] S2. Calculate white balance point

[0012] Calculate the proportion of each color light at the RGB and WC white balance points based on the basic data. Calculate the corresponding achievable control current and the white balance point based on the relationship between the tested luminous flux and current.

[0013] S3. Establish color mixing model

[0014] Based on the basics of colorimetry and white balance principles, and combined with the requirements of the color mixing control color wheel, the underlying color mixing model is established, and color mixing is achieved by calculating and changing the current;

[0015] S4. Power balance

[0016] Introducing a power conversion function to achieve saturation changes according to different requirements, while adjusting the power consistency to achieve stable power output during dimming;

[0017] S5. Hardware function implementation

[0018] Through hardware control, the algorithm is written into the program, and ultimately the overall light and color mixing is achieved by adjusting the current of each color LED chip;

[0019] S6, Calibration Color Wheel

[0020] By calculating the actual mixed light input parameters, the actual chromaticity coordinates after color mixing are calculated, and the actual display effect of the color disk is corrected.

[0021] Preferably, in S1, the basic test data includes: color coordinates, luminous flux, power of each color light and luminous flux data corresponding to each current.

[0022] Preferably, the color coordinates corresponding to the five colors after the test are in the coordinate positions in CIE1931.

[0023] Preferably, the center point coordinates (0.3333, 0.3333) are the standard white balance point.

[0024] Preferably, in S5, the algorithm is written into the MCU program.

[0025] Preferably, RGBWC are five colors of light: red light, green light, blue light, cool white light and warm white light. Structurally, the five colors of light LED chips are placed in similar areas within a bracket.

[0026] Preferably, in colorimetry, H represents hue, S represents saturation, and V represents brightness;

[0027] &(h) corresponds to the function of H, &(s) corresponds to the function of S, and &(v) corresponds to the function of V

[0028] (1)&(h)=h(0≤h≤360): corresponding Figure 1 The angle of rotation of the middle circle corresponds to the color of the mixed light;

[0029] (2)&(s)=s(0≤s≤100): corresponding Figure 1 The distance from the neutral color coordinate point to the WC point (0.3333, 0.3333) corresponds to the brightness ratio of white light to color;

[0030] (3)&(v)=v(0≤v≤100): corresponds to the brightness ratio.

[0031] Preferably, the corresponding basic currents calculated by white balance are (normal values ​​corresponding to white balance): IR, IG, IB, IW, IC.

[0032] The above technical solution of the present invention has the following beneficial technical effects:

[0033] 1. A better spatial light-combining effect is achieved through a five-in-one SMD LED light source. A five-in-one light source, RGBWC (red, green, blue, cool white, and warm white), is introduced. Structurally, the five color LED chips are placed in a similar area within a bracket. Because the distance between the light-emitting points is closer, compared with the discrete color mixing effect, the spatial light-combining color mixing is more uniform and the spatial light color consistency is better.

[0034] 2. The five-color algorithm improves the light mixing effect. From an algorithmic perspective, compared with the existing RGB light combination and RGB+WC light combination algorithm solutions, the algorithm has been optimized from the underlying logic, and the final light effect has been improved. Compared with the traditional RGB three-color algorithm on the market, the addition of WC is equivalent to adding five variables, which can ultimately achieve richer light effects, especially with a significant improvement in brightness.

[0035] Compared with the current RGB+WC light combining algorithm, the algorithm has been unified. Currently, multiple five-color light mixing adopts two relatively independent algorithms, one group for RGB and one group for WC. The patent of this invention adopts one algorithm to unify the five-color light mixing algorithm.

[0036] 3. The algorithm achieves relatively constant power output. From the perspective of electrical input control, current solutions, whether RGB dimming or RGB+CW dimming, have a wide range of total input power variations during the dimming and color mixing process, which also places higher demands on the control power supply. This patented invention introduces a corresponding transformation function during the dimming and color mixing process, ensuring both dimming and power consistency. With relatively stable power output, there is no need for expensive circuit control solutions, saving material costs during the product application process.

[0037] 4. The algorithm is used to achieve precise correspondence between the control color wheel display and the light color. The current algorithm mostly adjusts the input current of each color light in a unidirectional linear manner. The solution of the present invention converts the input current into a change in luminous flux, calculates the combined light coordinates through colorimetry theory, and then calculates the final color wheel display color through the combined light coordinates, thereby achieving a one-to-one correspondence between the display on the color wheel and the light color of the mixed light. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a diagram of the underlying logic algorithm model for establishing a color disk for a multi-color LED light mixing method proposed in the present invention.

[0039] Figure 2 This is a color coordinate position diagram of the five colors in CIE1931 in a multi-color LED light mixing method proposed by the present invention.

[0040] Figure 3 This is a diagram of the white balance point obtained by combining RGB, W, and C in CIE1931 in a multi-color LED light mixing method proposed by the present invention.

[0041] Figure 4 In the multi-color LED light mixing method proposed by the present invention, an accurate corresponding color disk diagram is obtained by calculation.

[0042] Figure 5 This is one of the power variation functions under the premise of constant total power in a multi-color LED light mixing method proposed by the present invention.

[0043] Figure 6 This is the second power variation function under the premise of constant total power in the multi-color LED mixing method proposed by the present invention.

[0044] Figure 7 This is a diagram of the integrated arrangement of five-color LED chips in a multi-color LED light mixing method proposed by the present invention.

[0045] Figure 8 This is a structural diagram of the discrete arrangement of five-color LEDs in a multi-color LED mixing method proposed by the present invention.

[0046] Figure 9 This is the HSV algorithm in the multi-color LED light mixing method proposed by the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a detailed description of the present invention with reference to the accompanying drawings. Figure 1-9 , the present invention is further described in detail. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0048] The present invention proposes a multi-color LED light mixing method, comprising the following steps:

[0049] S1. Test basic data;

[0050] S2. Calculate white balance point

[0051] Calculate the proportion of each color light at the RGB and WC white balance points based on the basic data. Calculate the corresponding achievable control current and the white balance point based on the relationship between the tested luminous flux and current.

[0052] S3, establish a color mixing model (see Figure 1 and 9 )

[0053] Based on the basics of colorimetry and white balance principles, and combined with the requirements of the color mixing control color wheel, the underlying color mixing model is established, and color mixing is achieved by calculating and changing the current;

[0054] S4, power balance (see Figure 5 and 6 )

[0055] Introducing a power conversion function to achieve saturation changes according to different requirements, while adjusting the power consistency to achieve stable power output during dimming;

[0056] S5. Hardware function implementation

[0057] Through hardware control, the algorithm is written into the program, and ultimately the overall light and color mixing is achieved by adjusting the current of each color LED chip;

[0058] S6, calibration color plate (reference Figure 4 )

[0059] By calculating the actual mixed light input parameters, the actual chromaticity coordinates after color mixing are calculated, and the actual display effect of the color disk is corrected.

[0060] In an optional embodiment, in S1 , the basic test data includes: color coordinates, luminous flux, power of each color light, and luminous flux data corresponding to each current.

[0061] In an optional embodiment, the color coordinates corresponding to the five colors after testing are in the coordinate positions in CIE1931.

[0062] In an optional embodiment, the center point coordinates (0.3333, 0.3333) are the standard white balance point.

[0063] In an optional embodiment, in S5 , the algorithm is written into the MCU program.

[0064] In an optional embodiment, RGBWC are five colors of light: red light, green light, blue light, cool white light and warm white light. Structurally, the five colors of light LED chips are placed in similar areas within a bracket.

[0065]

[0066] It should be noted that, see Figure 9 where H represents hue, S represents saturation, and V represents brightness. In the calculation, H represents the angle, V represents the distance from the inside to the outside, and V represents the overall parameter ratio.

[0067] It should be noted that, such as Figure 7 and Figure 8 , the structure and algorithm of the 5-color LED light source are adopted for comparison. Figure 8 This is an existing solution, with a discrete structure and two sets of algorithms.

[0068] Such as Figure 7 : The present invention adopts an integrated light source, an integrated structure, and a set of algorithms, which has more advantages in color mixing and is more convenient in control.

[0069] In an optional embodiment, in colorimetry, H represents hue, S represents saturation, and V represents brightness;

[0070] &(h) corresponds to the function of H, &(s) corresponds to the function of S, and &(v) corresponds to the function of V;

[0071] (1) &(h) = h (0 ≤ h ≤ 360): corresponding to Figure 1 the angle of circular rotation in the middle, corresponding to the color of the mixed light;

[0072] (2) &(s) = s (0 ≤ s ≤​​​​​​​​​​​​​​​​​​​​​​​

[0080] ⑤I(C) = (75 * IC * (1 - LOG(&(s), 100)) * &(v)) / 10000;

[0081] (2) When 120 = <h < 240: Input the hsv values, and the input currents corresponding to each color light are as follows:

[0082] ①I(R) = 0;

[0083] ②I(G) = (85 * IG * (240 - &(h)) * LOG(&(s), 100) * &(v)) / 1200000;

[0084] ③I(B) = (85 * IB * (&(h) - 120) * LOG(&(s), 100) * &(v)) / 1200000;

[0085] ④I(W) = (15 * IW * (1 - LOG(&(s), 100)) * &(v)) / 10000;

[0086] ⑤I(C) == (75 * IC * (1 - LOG(&(s), 100)) * &(v)) / 10000;

[0087] (3) When 240 = <h <= 360: Input the hsv values, and the input currents corresponding to each color light are as follows:

[0088] ①I(R) = (IR * (&(h) - 240) * LOG(&(s), 100) * &(v)) / 12000;

[0089] ②I(G) = 0;

[0090] ③I(B) = (IB * (360 - &(h)) * LOG(&(s), 100) * &(v)) / 12000;

[0091] ④I(W) = (15 * IW * (1 - LOG(&(s), 100)) * &(v)) / 10000;

[0092] ⑤I(C) = (75 * IC * (1 - LOG(&(s), 100)) * &(v)) / 10000.

[0093] It should be noted that the actual process of the hardware is as follows:

[0094] The hardware uses 16-bit grayscale and a PWM duty cycle of 0 to 65535. The server extracts the RGB value by color extraction and transmits it to the control terminal. After the control terminal optimizes the color through an algorithm, it controls the PWM duty cycle output and controls the different brightness of the five colors of LED to achieve the desired effect.

[0095] In the present invention, 1. A better spatial light combining effect is achieved through a five-in-one SMD LED light source, and a five-in-one light source, RGBWC (five colors of light: red light, green light, blue light, cold white light and warm white light) is introduced. Structurally, the five color LED chips are placed in a similar area in a bracket. Because the distance between each light-emitting point is relatively close, compared with the discrete color mixing effect, its spatial light combining and color mixing is more uniform, and the spatial light color consistency is better.

[0096] 2. The five-color algorithm improves the light mixing effect. From an algorithmic perspective, compared with the existing RGB light combination and RGB+WC light combination algorithm solutions, the algorithm has been optimized from the underlying logic, and the final light effect has been improved. Compared with the traditional RGB three-color algorithm on the market, the addition of WC is equivalent to adding five variables, which can ultimately achieve richer light effects, especially with a significant improvement in brightness.

[0097] Compared with the current RGB+WC light combining algorithm, the algorithm has been unified. Currently, multiple five-color light mixing adopts two relatively independent algorithms, one group for RGB and one group for WC. The patent of this invention adopts one algorithm to unify the five-color light mixing algorithm.

[0098] 3. The algorithm achieves relatively constant power output. From the perspective of electrical input control, current solutions, whether RGB dimming or RGB+CW dimming, have a wide range of total input power variations during the dimming and color mixing process, which also places higher demands on the control power supply. This patented invention introduces a corresponding transformation function during the dimming and color mixing process, ensuring both dimming and power consistency. With relatively stable power output, there is no need for expensive circuit control solutions, saving material costs during the product application process.

[0099] 4. The algorithm is used to achieve precise correspondence between the control color wheel display and the light color. The current algorithm mostly adjusts the input current of each color light in a unidirectional linear manner. The solution of the present invention converts the input current into a change in luminous flux, calculates the combined light coordinates through colorimetry theory, and then calculates the final color wheel display color through the combined light coordinates, thereby achieving a one-to-one correspondence between the display on the color wheel and the light color of the mixed light.

[0100] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A multi-color LED light mixing method, characterized in that: The following steps are involved: S1. Test basic data; S2. Calculate white balance point Based on the basic data, the proportions of each color of RGB and WC white balance points are calculated. Based on the relationship between the measured luminous flux and current, the corresponding controllable current and white balance point are calculated. RGBWC represents five colors of light: red, green, blue, cool white, and warm white. Structurally, the five color LED chips are placed in close proximity within a single bracket. S3. Establish color mixing model Based on the basics of colorimetry and white balance principles, and combined with the requirements of the color mixing control color wheel, the underlying color mixing model is established, and color mixing is achieved by calculating and changing the current; S4. Power balance Introducing a power conversion function to achieve saturation changes according to different requirements, while adjusting the power consistency to achieve stable power output during dimming; S5. Hardware function implementation Through hardware control, the algorithm is written into the program, and ultimately the overall light and color mixing is achieved by adjusting the current of each color LED chip; S6, Calibration Color Wheel By calculating the actual mixed light input parameters, the actual chromaticity coordinates after color mixing are calculated, and the actual display effect of the color disk is corrected.

2. The multi-color LED light mixing method according to claim 1, characterized in that: In S1, the basic test data includes: color coordinates, luminous flux, power of each color light and luminous flux data corresponding to each current.

3. The multi-color LED light mixing method according to claim 2, characterized in that: The center point coordinates (0.3333, 0.3333) are the standard white balance point.

4. The multi-color LED light mixing method according to claim 1, characterized in that: In S5, the algorithm is written into the MCU program.

5. The multi-color LED light mixing method according to claim 1, characterized in that: The corresponding basic currents calculated by white balance are (the normal values ​​corresponding to white balance): IR, IG, IB, IW, IC.

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