Light mixing control method and apparatus for color light, and lamp
By acquiring and calculating the chromaticity coordinates and brightness of white light and source colored light, the color power ratio of the target colored light is determined, solving the problem of poor spectral continuity in the traditional RGBW light mixing method and achieving better color quality and visual comfort.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SUZHOU OPPLE LIGHTING
- Filing Date
- 2025-12-25
- Publication Date
- 2026-07-02
AI Technical Summary
The traditional RGBW light mixing method results in poor continuity of the mixed target color light spectrum, poor color quality, and insufficient visual comfort.
By acquiring the source chromaticity coordinates and source brightness of white light and three source colored lights, the target chromaticity coordinates of the target colored light are determined. Based on geometric calculations and color power ratios, the output of white light and source colored lights is controlled to mix the target colored light.
It improves the spectral continuity and color quality of the target colored light, thereby enhancing visual comfort.
Smart Images
Figure CN2025145567_02072026_PF_FP_ABST
Abstract
Description
Colored light mixing control methods, devices and luminaires
[0001] Cross-reference to related applications
[0002] This application claims priority to Chinese patent application No. 202411941565X, filed on December 25, 2024, entitled "Colored Light Mixing Control Method, Apparatus and Lamp Fixture", which is incorporated herein by reference in its entirety. Technical Field
[0003] This application relates to the field of light mixing technology, and in particular to a method, device and lamp for controlling color light mixing. Background Technology
[0004] The conventional RGBW light source uses "white light (W)" alone for mixing. When colored light is needed, it is usually obtained by mixing RGB three-color light. Because the LEDs for R, G, and B light all use single-wavelength chips with narrow half-widths, the resulting target colored light, while meeting color requirements, suffers from poor overall spectral continuity, leading to poor color quality (CQS). This type of target colored light can cause visual stimulation and poor visual comfort. Summary of the Invention
[0005] This application provides a method, apparatus, and lamp for controlling color light mixing, in order to solve the problem that the continuity of the target color light spectrum is poor in traditional technology, resulting in poor color quality.
[0006] This application provides a method for controlling color light mixing, comprising the following steps.
[0007] Obtain the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0008] Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0009] Based on the target chromaticity coordinates of the target colored light, as well as the source chromaticity coordinates and source luminance of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each of the color power ratios is used to determine the target luminance of the light source output of the corresponding color, so as to mix the target colored light.
[0010] According to the color light mixing control method provided in this application, the color power ratio of white light and the three source color lights is determined based on the target chromaticity coordinates of the target color light and the source chromaticity coordinates and source brightness of white light and the three source color lights, including the following steps.
[0011] The target color gamut is determined by the source color gamut of the target chromaticity coordinates. The source color gamut coordinates of the white light and the source color gamut coordinates of any two source colored lights form a sub-color gamut, for a total of three sub-color gamuts. The target color gamut is one of the three sub-color gamuts.
[0012] The two source colors corresponding to the target color gamut are identified as two candidate colors.
[0013] Based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights, the color power ratio of white light and the two candidate colored lights is determined.
[0014] According to the color light mixing control method provided in this application, determining the target color gamut where the target chromaticity coordinates are located includes: determining the target color gamut where the target chromaticity coordinates are located through geometric calculation based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity.
[0015] According to the color light mixing control method provided in this application, the target color gamut where the target chromaticity coordinates are located is determined by geometric calculation based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity coordinate, including the following steps.
[0016] Determine a ray that originates from the source chromaticity coordinates of white light and is parallel to the horizontal axis of the color gamut coordinate system.
[0017] Using the ray as the 0-degree starting line, and the three line segments from the coordinate points of the three source chromaticity coordinates of the three source colored lights to the coordinate points of the source chromaticity coordinates of the white light as the termination lines, three reference vector angles are determined.
[0018] The target vector angle is determined by taking the ray as the 0-degree starting line and the line segment from the coordinate point of the target chromaticity coordinates to the coordinate point of the source chromaticity coordinates of white light as the ending line.
[0019] Based on the relationship between the target vector angle and the three reference vector angles, the target color gamut where the target chromaticity coordinates are located is determined.
[0020] According to the color light mixing control method provided in this application, based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights, the color power ratio of white light and the two candidate colored lights is determined, including: calculating the color power ratio of white light and the two candidate colored lights according to the following formula.
[0021] b = a*(y2-y1)-x1y2+x2y1.
[0022] Among them, P w Let P1 and P2 be the color power ratios of white light and P1 and P2 be the color power ratios of two candidate colored lights, respectively. w Let L1 be the source luminance of white light, and L2 be the source luminances of two candidate colored lights, respectively. w ,y w (x1, y1) and (x2, y2) are the source chromaticity coordinates of the white light and the two candidate colored lights, respectively. T ,y T ) represents the target chromaticity coordinates, where a, b, and c are intermediate variables.
[0023] According to the color light mixing control method provided in this application, the source brightness of the white light and the three source colored lights are each the maximum brightness of their respective light sources under equal rated power.
[0024] According to the color light mixing control method provided in this application, the method further includes: normalizing the power ratio of each color so that the sum of the normalized power ratios of each color is 1.
[0025] This application also provides a color light mixing control device, which includes the following modules.
[0026] The source chromaticity coordinate acquisition module is configured to acquire the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0027] The target chromaticity coordinate acquisition module is configured to acquire the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0028] The mixing ratio determination module is configured to determine the color power ratio of the white light and the three source colored lights based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source brightness of the white light and the three source colored lights. Each of the color power ratios is used to determine the target brightness of the light source output of the corresponding color, so as to mix the target colored light.
[0029] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the color light mixing control method as described above.
[0030] This application also provides a lighting fixture, including: a light source and the above-mentioned electronic device, wherein the light source includes: a white sub-light source and color sub-light sources that emit three source color lights respectively, and the electronic device is connected to the white sub-light source and the three color sub-light sources and is configured to drive the corresponding sub-light sources to emit light according to the power ratio of each color, so as to mix the target color light.
[0031] The color light mixing control method, apparatus, and lamp provided in this application obtain the source chromaticity coordinates and source brightness of white light and three source colored lights, respectively. The source chromaticity coordinates of the white light are located within a basic color gamut formed by the three source chromaticity coordinates of the three source colored lights. The source brightness of the white light and the three source colored lights is the brightness under the same power supply driving power condition. The target chromaticity coordinates of the target colored light are obtained, and the target chromaticity coordinates are located within the basic color gamut. Based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source brightness of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each color power ratio is used to determine the target brightness of the light source output of the corresponding color, so as to mix the target colored light. In this application, because white light has good spectral continuity, the target colored light obtained by white light participating in the mixing continues the characteristic of good spectral continuity of white light, making the overall band energy distribution more uniform compared with the traditional three-color light mixing method. Therefore, the color quality of the mixed target colored light is better, and the visual experience is more comfortable. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in this application or conventional technology, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0033] Figure 1 is one of the flowcharts of the color light mixing control method provided in the embodiments of this application.
[0034] Figure 2 is a schematic diagram of the basic color gamut and sub-color gamut in the color light mixing control method provided in the embodiments of this application.
[0035] Figure 3 is a second schematic flowchart of the color light mixing control method provided in the embodiments of this application.
[0036] Figure 4 is a schematic flowchart of the color light mixing control method provided in the embodiments of this application.
[0037] Figure 5 is a schematic diagram of determining the target color gamut in the color light mixing control method provided in the embodiments of this application.
[0038] Figure 6 is a schematic diagram of the chromaticity coordinates of three target colored lights in the colored light mixing control method provided in the embodiments of this application.
[0039] Figure 7 is a spectral comparison of the mixing results of the target color light A in Figure 6 using the RGBW color light mixing control method of this application and the traditional RGB three-color light mixing method.
[0040] Figure 8 is a spectral comparison of the mixing results of the target color light B in Figure 6 using the RGBW color light mixing control method of this application and the traditional RGB three-color light mixing method.
[0041] Figure 9 is a spectral comparison of the mixing results of the target color light C in Figure 6 using the RGBW color light mixing control method of this application and the traditional RGB three-color light mixing method.
[0042] Figure 10 is a spectral comparison of the mixing results of the target color light B in Figure 6 using the RGBW color light mixing control method of this application and the traditional RGB three-color light mixing method under different red light conditions.
[0043] Figure 11 is a schematic diagram of the structure of the color light mixing control device provided in the embodiment of this application.
[0044] Figure 12 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] The color light mixing control method of this application embodiment, as shown in FIG1, includes the following steps S110 and S130.
[0047] Step S110: Obtain the source chromaticity coordinates and source luminance of the white light and the three source colored lights. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights. The source luminance of the white light and the three source colored lights is the luminance under the same power supply driving power condition. The unit of luminance is candela per square meter (cd / m²). 2 ), which represents the light intensity per unit area. 1 candela / square meter is equal to the brightness of a light source with 1 candela on an area of 1 square meter.
[0048] Specifically, the source chromaticity coordinates and source brightness of white light and the three source colored lights can be measured using professional optical equipment. Taking the light emitted by four types of LED light sources, namely R, G, B and W, as an example, the specifications of each LED light source are shown in Table 1 below.
[0049] Table 1. Specifications of four commonly used LED light sources: R, G, B, and W.
[0050] Figure 2 shows the source chromaticity coordinates of the light emitted by the four LED light sources R, G, B and W in the color gamut coordinate system. The source chromaticity coordinates of R, G and B are different depending on the wavelength. The source chromaticity coordinates of W are usually (0.333, 0.333), or they can be coordinates within the allowable error range around (0.333, 0.333).
[0051] As shown in Figure 2, the three source chromaticity coordinates of the three source colored lights can form a basic color gamut, for example, the basic color gamut formed by RGB is the triangular color gamut area shown by the thicker dashed line in Figure 2. Since the final target colored light can only be a color within this basic color gamut, and white light must participate in the mixing, the source chromaticity coordinates of the white light must be located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights.
[0052] Step S120: Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut. Since the final mixed target colored light can only be a color within this basic color gamut, the target chromaticity coordinates must be located within the basic color gamut.
[0053] Step S130: Based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source brightness of the white light and the three source colored lights, determine the color power ratio of the white light and the three source colored lights. Each color power ratio is used to determine the target brightness of the light source output of the corresponding color, so as to mix the target colored light.
[0054] Specifically, the color power ratio represents the ratio of the target brightness to be output by each light source to the source brightness of each light source. This can be understood as the brightness of the white light and the three source colored lights under the same power supply conditions (i.e., equal power supply for each light source). Each source brightness can be measured using dedicated optical equipment. Therefore, in practical applications, it is only necessary to control the white light and the three source colored lights to output according to their respective color power ratios based on their respective source brightness. That is, the corresponding light sources can output the corresponding target brightness, thereby mixing to produce the target colored light.
[0055] In the color light mixing control method of this embodiment, since white light has good spectral continuity, the target color light obtained by white light participating in the mixing continues the characteristic of good spectral continuity of white light, making the overall band energy distribution more uniform than the traditional three-color light mixing method, so that the color quality of the mixed target color light is better and the visual experience is more comfortable.
[0056] In the field of light mixing, for a target colored light (i.e., the target chromaticity coordinates are determined), and the source chromaticity coordinates of three source colored lights (e.g., RGB) are also determined, a unique set of color power ratios can be obtained for the three source colored lights. Controlling the output brightness of the three source colored lights according to this set of color power ratios allows for the mixing to obtain the target colored light. However, with four source lights, theoretically there are multiple sets of color power ratios, i.e., multiple sets (P... W ,P R ,P G ,P B ), according to each group (P W ,P R ,P G ,P B Controlling the four source lights can mix them to obtain the target colored light, and the process of solving the power ratio of each color is relatively complex. Therefore, in some embodiments, as shown in Figure 3, step S120 specifically includes the following steps S310 to S330.
[0057] Step S310: Determine the target color gamut where the target chromaticity coordinates are located. The source chromaticity coordinates of the white light and the source chromaticity coordinates of any two source colored lights form a sub-color gamut, for a total of three sub-color gamuts. The target color gamut is one of the three sub-color gamuts.
[0058] Specifically, as shown in Figure 2, taking RGBW light as an example, the source chromaticity coordinates of white light, green light, and blue light form sub-color gamut I; the source chromaticity coordinates of white light, blue light, and red light form sub-color gamut II; and the source chromaticity coordinates of white light, red light, and green light form sub-color gamut III. The target color gamut where the target chromaticity coordinate T is located is sub-color gamut II.
[0059] Step S320: Determine the two source colored lights corresponding to the target color gamut as two candidate colored lights. As shown in Figure 2, the blue light and red light corresponding to sub-color gamut II can be determined as candidate colored lights.
[0060] Step S320: Based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights, determine the color power ratio of white light and the two candidate colored lights, i.e., the color power ratio of the other non-candidate source colored light is 0. As shown in Figure 2, based on the target chromaticity coordinates T, the source chromaticity coordinates of white light, blue light and red light, and the source brightness of white light, blue light and red light, determine the color power ratio of white light, blue light and red light, while the color power ratio of green light is 0.
[0061] In this embodiment, since the target chromaticity coordinates are within a certain sub-color gamut, the three source lights that make up the sub-color gamut can be used to mix the colored light corresponding to the target chromaticity coordinates. Moreover, the target colored light obtained by mixing the three source lights can obtain a unique color power ratio of the three source lights, and the calculation is simple.
[0062] In some embodiments, determining the target color gamut where the target chromaticity coordinates are located includes: determining the target color gamut where the target chromaticity coordinates are located through geometric calculation based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity coordinate. As shown in Figure 2, the target color gamut where the target chromaticity coordinates T are located can be determined using various geometric calculation methods. For example, a first linear function can be determined by points B and W, and a second linear function can be determined by points R and W. The positional relationship between the coordinates of T and the first and second linear functions can then be determined, thus determining that the target color gamut where the target chromaticity coordinates T are located is the sub-color gamut II. Another example is that six reference linear functions can be determined by points B and G, G and R, R and B, B and W, G and W, and R and W respectively. A target linear function parallel to the x-axis can be determined through point T. The target linear function intersects each reference linear function. By comparing the positional relationship between the coordinates of point T and the coordinates of each intersection point, the target color gamut where the target chromaticity coordinates T are located can be determined as the sub-color gamut II.
[0063] In some embodiments, as shown in FIG4, the target color gamut where the target color coordinates are located is determined by geometric calculation based on the positional relationship between the target color coordinates and the source color coordinates, including steps S410 to S440.
[0064] Step S410: Determine a ray that starts from the source chromaticity coordinates of white light and is parallel to the horizontal axis of the color gamut coordinate system. As shown in Figure 5, taking RGBW four source lights as an example, determine a ray l that starts from the source chromaticity coordinates of white light and is parallel to the horizontal axis of the color gamut coordinate system.
[0065] Step S420: Using the ray as the 0-degree starting line, and the three line segments from the coordinates of the three source chromaticity coordinates of the three source colored lights to the coordinates of the source chromaticity coordinates of the white light as the termination lines, determine three reference vector angles. As shown in Figure 5, using l as the 0-degree starting line and line segment GW as the termination line, determine the first reference vector angle θ. G Using line segment BW as the termination line, determine the second reference vector angle θ. B Using line segment RW as the termination line, determine the third reference vector angle θ. R .
[0066] Step S430: Using the ray as the 0-degree starting line and the line segment from the target chromaticity coordinate point to the source chromaticity coordinate point of white light as the ending line, determine the target vector angle. As shown in Figure 5, using l as the 0-degree starting line and line segment TW as the ending line, determine the target vector angle θ. T .
[0067] Step S440: Based on the relationship between the target vector angle and the three reference vector angles, locate the target color gamut where the target chromaticity coordinates are located. For example: in Figure 5, the target vector angle θ T It is greater than θ B And less than θ R Therefore, the target color gamut where the target chromaticity coordinate T of the target colored light is located can be determined as sub-color gamut II.
[0068] Specifically, the target color gamut where the target chromaticity coordinate T of the target colored light is located can be determined by referring to Table 2 below.
[0069] Table 2. Reference Table for Determining the Target Color Gamut
[0070] It should be noted that this embodiment uses a counterclockwise vector angle, but a clockwise vector angle can also be used.
[0071] In this embodiment, the vector angle comparison method can quickly and accurately determine the target color gamut where the target chromaticity coordinates are located.
[0072] In some embodiments, step S320 specifically includes: calculating the color power ratio of white light and the two candidate colored lights according to the following formula. b = a*(y2-y1)-x1y2+x2y1.
[0073] Among them, P w Let P1 and P2 be the color power ratios of white light and P1 and P2 be the color power ratios of two candidate colored lights, respectively. w Let L1 be the source luminance of white light, and L2 be the source luminances of two candidate colored lights, respectively. w ,yw (x1, y1) and (x2, y2) are the source chromaticity coordinates of the white light and the two candidate colored lights, respectively. T ,y T Let P be the target chromaticity coordinates, where a, b, and c are intermediate variables. The color power ratio of white light and the two candidate colored lights is calculated to be P. w After P1 and P2, and given that the light is mixed based on the source brightness, the brightness L of the target colored light after mixing can be determined. T For: L T =P1×L1+P2×L2+P w ×L w .
[0074] The color power ratio of the white light and the two candidate colored lights is P. w Under the control of P1 and P2, and with light mixing based on source brightness, the target brightness outputs of the white light and the two candidate colored lights are respectively: and
[0075] For example, as shown in Figure 5, the target color gamut where the target chromaticity coordinate T of the target colored light is located is sub-gamut II. In this case, the source chromaticity coordinates of the red light can be determined as (x1, y1), and the source chromaticity coordinates of the blue light can be determined as (x2, y2). L1 and L2 are the source luminances of the red and blue light, respectively, thus allowing the calculation of P. w P1 and P2.
[0076] In some embodiments, the source luminance of the white light and the three source colored lights are each the maximum luminance of their respective light sources at equal rated power. Based on the maximum luminance of the white light and the three source colored lights, the target colored light obtained after mixing the light by their respective color power ratios has a higher luminance.
[0077] It should be noted that after obtaining the color power ratios of the white light and the two candidate colored lights, the brightness of the target colored light can be adjusted by changing the brightness of the white light and the two candidate colored lights. Specifically, based on the power supply drive power corresponding to the source brightness, the power supply drive power can be increased or decreased (ensuring that the power supply drive power of each light source is equal). This allows for the adjustment of the L... T The adjustment of the target colored light, i.e., L, thereby adjusts the brightness of the target colored light. T =P1×L′1+P2×L′2+P w ×L′ w , where L′ w L′1 and L′2 represent the brightness of white light and two candidate colored lights before mixing, respectively, after adjusting their respective power supply drive power. Furthermore, while keeping the power supply drive power of each light source constant, P can be adjusted... w P1 and P2, as long as Pw The ratio between P1 and P2 can be kept constant to adjust the brightness of the target colored light.
[0078] The color power ratio P calculated in the above embodiments w P1 and P2 may be relatively large, for example: in L w When L1 and L2 are relatively large, the color power ratio is greater than P. w P1 and P2 are relatively large, resulting in P w The sum of P1, P2, and P2 is greater than 1, resulting in a very high brightness of the final target colored light, which puts a significant strain on the power supply after light mixing. Therefore, in some embodiments, the colored light mixing control method further includes: normalizing the power ratios of each color so that the sum of the normalized power ratios is 1. After normalization, the proportional relationship between the power ratios of each color remains unchanged, i.e., P... w The ratio of P1, P2, and P3 remains unchanged, but their sum will not exceed 1, i.e., P1 + P2 + P3. w =100%, thereby controlling the brightness of the target colored light after mixing within a certain range and reducing the pressure on the power supply.
[0079] Of course, the color power ratio P calculated in the above embodiments w P1 and P2 may be smaller, for example: in L w When L1 and L2 are relatively small, the color power is greater than P. w P1 and P2 are smaller, resulting in P w The sum of P1, P2, and P3 is less than 1, resulting in a lower brightness of the final target colored light. To improve the brightness of the target colored light, the power ratios of each color can be normalized so that the sum of the normalized power ratios is 1. As shown in Figure 6, there are three target colored lights. The target chromaticity coordinates A corresponding to target colored light Col1 are (0.278, 0.417), B corresponding to target colored light Col2 are (0.431, 0.312), and C corresponding to target colored light Col3 are (0.374, 0.547). Taking the three source colored lights (RGB) in Table 3 and four light sources (RGBW) with a color temperature between 2700K and 6500K and a white light color rendering index of 90 as examples, the results of mixing the four light sources (RGBW) to obtain the three target colored lights in Figure 6 are compared with the results of mixing the three light sources (RGB) in the traditional way.
[0080] Table 3 RGB Specifications of Source Color Light
[0081] As shown in Table 4 and Figure 7, Table 4 shows the result of mixing the target colored light corresponding to the target chromaticity coordinate A, where the target chromaticity coordinate A is (0.278, 0.417). The first row of Table 4 shows the color power ratio of each RGB source light required by the traditional RGB mixing method, and the CQS of the target colored light obtained by mixing. The following four rows show the color power ratio of each source light required by the method of the above embodiments of this application under the conditions of RGB and white light W with different color temperatures, and the CQS of the target colored light obtained by mixing.
[0082] In Figure 6, the target chromaticity coordinate A is in the sub-color gamut I region in Figure 2. Therefore, the candidate colored lights are blue and green, and the color power ratio of red light is 0. For example, in row 1b, the color power ratios of green, blue and white light are 6%, 59% and 35% respectively, and their CQS is 76, which is significantly better than the CQS 65 corresponding to the traditional light mixing method.
[0083] Figure 7 shows the spectrum of the target colored light corresponding to each row of the light mixing results in Table 4. It can be seen that the spectral continuity of the target colored light mixed by the color light mixing control method of this application is significantly better than that of the target colored light mixed by the traditional three-color light mixing.
[0084] Similarly, Table 5 and Figure 8 show the mixing results of the target colored light corresponding to the target chromaticity coordinate B, and Table 6 and Figure 9 show the mixing results of the target colored light corresponding to the target chromaticity coordinate C. In Tables 5 and 6, the first row represents the color power ratio of each RGB source light required by the traditional RGB mixing method, and the CQS of the mixed target colored light. The following four rows represent the color power ratio of each source light required for mixing under RGB and white light W of different color temperatures using the method described in the above embodiments of this application, and the CQS of the mixed target colored light. Figures 8 and 9 are the spectra of the target colored light corresponding to each row of the mixing results in Tables 5 and 6, respectively.
[0085] Table 4 shows the results of target color light mixing corresponding to target chromaticity coordinate A.
[0086] Table 5 shows the results of target colored light mixing corresponding to the target chromaticity coordinate B.
[0087] Table 6 shows the results of target color light mixing corresponding to the target chromaticity coordinate C.
[0088] As can be seen from Figures 7-9, the spectral continuity of the target colored light produced by the color light mixing control method of this application is significantly better than that of the target colored light produced by traditional three-color light mixing. Data from Tables 4 (1a-1d), 5 (2a-2d), and 6 (3a-3d) show that the color quality (CQS) of the target colored light produced by the color light mixing control method of this application is better than that of the target colored light produced by traditional three-color light mixing, especially the CQS of the target colored light after mixing at the target chromaticity coordinate B, which is significantly better than the CQS of the target colored light produced by traditional three-color light mixing.
[0089] Among them, the three source colored lights can be excited in different ways. For example, the red light in RGB can be excited by covering the red phosphor with a blue LED. The white light, blue light, green light and the excited red light can also achieve good results by mixing the light in the way of the embodiment of this application, as shown in Tables 7 and 8 and Figure 10.
[0090] Table 7 Specifications of WGB
[0091] In Table 8, the CQS of the target colored light corresponding to the chromaticity coordinates (0.421, 0.314) obtained by mixing red light R with W, G, and B using the methods (4a-4c) of this application embodiment is significantly better than that obtained by mixing red light R with W, G, and B using traditional RGB mixing. As can also be seen from Figure 10, the spectral continuity of the target colored light obtained by the method of this application embodiment is significantly better than that obtained by mixing traditional RGB.
[0092] Table 8 shows the results of target color light mixing corresponding to the target chromaticity coordinates (0.421, 0.314).
[0093] The experimental results above show that the target colored light obtained by the color light mixing control method in the above embodiments has better continuity, better color quality, less visual stimulation, or even no stimulation, and better visual comfort.
[0094] The color light mixing control device provided in this application is described below. The color light mixing control device described below can be referred to in correspondence with the color light mixing control method described above.
[0095] The color light mixing control device of this application embodiment, as shown in FIG11, includes the following modules.
[0096] The source chromaticity coordinate acquisition module 1110 is configured to acquire the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0097] The target chromaticity coordinate acquisition module 1120 is configured to acquire the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0098] The mixing ratio determination module 1130 is configured to determine the color power ratio of the white light and the three source colored lights based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source brightness of the white light and the three source colored lights. Each of the color power ratios is used to determine the target brightness of the light source output of the corresponding color, so as to mix the target colored light.
[0099] In some embodiments, the light mixing ratio determination module 1130 includes the following modules.
[0100] The target color gamut determination module is configured to determine the target color gamut where the target chromaticity coordinates are located. The source chromaticity coordinates of the white light and the source chromaticity coordinates of any two source colored lights form a sub-color gamut, for a total of three sub-color gamuts. The target color gamut is one of the three sub-color gamuts.
[0101] The candidate color light determination module is configured to determine the two source color lights corresponding to the target color gamut as two candidate color lights.
[0102] The color power ratio determination module is configured to determine the color power ratio of white light and the two candidate colored lights based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights.
[0103] In some embodiments, the target color gamut determination module is specifically configured to determine the target color gamut where the target chromaticity coordinates are located through geometric calculation based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity.
[0104] In some embodiments, the target color gamut determination module specifically includes the following modules.
[0105] The ray determination module is configured to determine a ray that originates from the source chromaticity coordinates of white light and is parallel to the horizontal axis of the gamut coordinate system.
[0106] The reference vector angle determination module is configured to determine three reference vector angles, with the ray as the 0-degree starting line and three line segments from the coordinate points of the three source chromaticity coordinates of the three source colored lights to the coordinate points of the source chromaticity coordinates of the white light as the termination lines.
[0107] The target vector angle determination module is configured to determine the target vector angle by taking the ray as the 0-degree starting line and the line segment from the coordinate point of the target chromaticity coordinates to the coordinate point of the source chromaticity coordinates of white light as the ending line.
[0108] The target color gamut positioning module is configured to locate the target color gamut where the target chromaticity coordinates are located based on the relationship between the target vector angle and the three reference vector angles.
[0109] In some embodiments, the color power ratio determination module is specifically configured to calculate the color power ratio of white light and the two candidate colored lights according to the following formula. b = a*(y2-y1)-x1y2+x2y1.
[0110] Among them, P w Let P1 and P2 be the color power ratios of white light and P1 and P2 be the color power ratios of two candidate colored lights, respectively. w Let L1 be the source luminance of white light, and L2 be the source luminances of two candidate colored lights, respectively. w ,y w (x1, y1) and (x2, y2) are the source chromaticity coordinates of the white light and the two candidate colored lights, respectively. T ,y T ) represents the target chromaticity coordinates, where a, b, and c are intermediate variables.
[0111] In some embodiments, the source brightness of the white light and the three source colored lights are each the maximum brightness of their respective light sources at equal rated power.
[0112] In some embodiments, the color light mixing control device further includes: a color power ratio normalization module, configured to normalize each color power ratio so that the sum of the normalized color power ratios is 1.
[0113] Figure 12 illustrates a schematic diagram of the physical structure of an electronic device. As shown in Figure 12, the electronic device may include: a processor 1210, a communication interface 1220, a memory 1230, and a communication bus 1240. The processor 1210, communication interface 1220, and memory 1230 communicate with each other via the communication bus 1240. The processor 1210 can call logical instructions in the memory 1230 to execute a color light mixing control method, which includes the following steps.
[0114] Obtain the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0115] Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0116] Based on the target chromaticity coordinates of the target colored light, as well as the source chromaticity coordinates and source luminance of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each of the color power ratios is used to determine the target luminance of the light source output of the corresponding color, so as to mix the target colored light.
[0117] Furthermore, the logical instructions in the aforementioned memory 1230 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, essentially, or the part that contributes to conventional technology, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0118] This application also provides a lighting fixture, including: a light source and the aforementioned electronic device. The light source includes: a white sub-light source and three colored sub-light sources that respectively emit the three source colored lights. The electronic device is connected to the white sub-light source and the three colored sub-light sources and is configured to drive the corresponding sub-light sources to emit light according to the power ratio of each color, so as to mix the target colored light. It is understood that the aforementioned electronic device may include a microcontroller or a control chip with a processor and memory.
[0119] The white sub-light source is a white LED, and the three colored sub-light sources are a red LED, a green LED, and a blue LED.
[0120] Specifically, by running the aforementioned color light mixing control method, the electronic device determines the two source color lights corresponding to the target color light as two candidate color lights after determining the sub-color gamut where the target color light's chromaticity coordinates are located. Based on the target chromaticity coordinates, the source chromaticity coordinates of the white light and the two candidate color lights, and the source brightness of the white light and the two candidate color lights, the color power ratio of the white light and the two candidate color lights is determined. Then, the sub-light sources corresponding to the white light and the two candidate color lights are driven to emit light according to each color power ratio, so as to mix the target color light.
[0121] For example: if the target color gamut is sub-gamut II, red light and blue light are identified as two candidate colored lights. Based on the target chromaticity coordinates, the source chromaticity coordinates of white light, red light and blue light, and the source brightness of white light, red light and blue light, the color power ratio of white light, red light and blue light is determined (at this time, the color power ratio of green light is 0, and the green LED does not emit light when driven). Then, the white LED is driven to emit light and the target brightness (the product of color power ratio and source brightness) of the red LED and blue LED is driven according to the color power ratio of white light and red light and blue light respectively, so as to mix the target colored light.
[0122] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the color light mixing control method provided by the above methods, which includes the following steps.
[0123] Obtain the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0124] Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0125] Based on the target chromaticity coordinates of the target colored light, as well as the source chromaticity coordinates and source luminance of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each of the color power ratios is used to determine the target luminance of the light source output of the corresponding color, so as to mix the target colored light.
[0126] In another aspect, this application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the color light mixing control method provided by the above methods, the method comprising the following steps.
[0127] Obtain the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power supply driving power conditions.
[0128] Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut.
[0129] Based on the target chromaticity coordinates of the target colored light, as well as the source chromaticity coordinates and source luminance of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each of the color power ratios is used to determine the target luminance of the light source output of the corresponding color, so as to mix the target colored light.
[0130] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0131] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to conventional technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.
[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for controlling color light mixing, comprising: Obtain the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of white light and three source colored lights is the brightness under the same power supply driving power condition. Obtain the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut; Based on the target chromaticity coordinates of the target colored light, as well as the source chromaticity coordinates and source luminance of the white light and the three source colored lights, the color power ratio of the white light and the three source colored lights is determined. Each of the color power ratios is used to determine the target luminance of the light source output of the corresponding color, so as to mix the target colored light.
2. The color light mixing control method according to claim 1, wherein, Based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source luminance of the white light and the three source colored lights, determine the color power ratio of the white light and the three source colored lights, including: The target color gamut where the target chromaticity coordinates are located is determined. The source chromaticity coordinates of the white light and the source chromaticity coordinates of any two source colored lights form a sub-color gamut, for a total of three sub-color gamuts. The target color gamut is one of the three sub-color gamuts. The two source colored lights corresponding to the target color gamut are identified as two candidate colored lights; Based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights, the color power ratio of white light and the two candidate colored lights is determined.
3. The color light mixing control method according to claim 2, wherein, Determining the target color gamut where the target chromaticity coordinates are located includes: Based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity, the target color gamut where the target chromaticity coordinates are located is determined through geometric calculation.
4. The color light mixing control method according to claim 3, wherein, Based on the positional relationship between the target chromaticity coordinates and the coordinates of each source chromaticity, the target color gamut where the target chromaticity coordinates are located is determined through geometric calculations, including: Determine a ray that originates from the source chromaticity coordinates of white light and is parallel to the horizontal axis of the color gamut coordinate system; Using the ray as the 0-degree starting line, and the three line segments from the coordinate points of the three source chromaticity coordinates of the three source colored lights to the coordinate points of the source chromaticity coordinates of the white light as the termination lines, three reference vector angles are determined. The target vector angle is determined by taking the ray as the 0-degree starting line and the line segment from the coordinate point of the target chromaticity coordinates to the coordinate point of the source chromaticity coordinates of white light as the ending line. Based on the relationship between the target vector angle and the three reference vector angles, the target color gamut where the target chromaticity coordinates are located is determined.
5. The color light mixing control method according to claim 2, wherein, Based on the target chromaticity coordinates, the source chromaticity coordinates of white light and the two candidate colored lights, and the source brightness of white light and the two candidate colored lights, the color power ratio of white light and the two candidate colored lights is determined, including: calculating the color power ratio of white light and the two candidate colored lights according to the following formula: b = a*(y2-y1)-x1y2+x2y1; Among them, P w Let P1 and P2 be the color power ratios of white light and P1 and P2 be the color power ratios of two candidate colored lights, respectively. w Let L1 be the source luminance of white light, and L2 be the source luminances of two candidate colored lights, respectively. w ,y w (x1, y1) and (x2, y2) are the source chromaticity coordinates of the white light and the two candidate colored lights, respectively. T ,y T ) represents the target chromaticity coordinates, where a, b, and c are intermediate variables.
6. The color light mixing control method according to claim 1, wherein, The source brightness of the white light and the three source colored lights are each the maximum brightness of their respective light sources at equal rated power.
7. The color light mixing control method according to any one of claims 1 to 6, further comprising: The power ratios of each color are normalized so that the sum of the normalized power ratios of each color is 1.
8. A color light mixing control device, comprising: The source chromaticity coordinate acquisition module is configured to acquire the source chromaticity coordinates and source brightness of white light and three source colored lights respectively. The source chromaticity coordinates of the white light are located within the basic color gamut formed by the three source chromaticity coordinates of the three source colored lights as vertices. The source brightness of the white light and the three source colored lights are brightness under the same power driving power conditions. The target chromaticity coordinate acquisition module is configured to acquire the target chromaticity coordinates of the target colored light, wherein the target chromaticity coordinates are located within the basic color gamut; The mixing ratio determination module is configured to determine the color power ratio of the white light and the three source colored lights based on the target chromaticity coordinates of the target colored light and the source chromaticity coordinates and source brightness of the white light and the three source colored lights. Each of the color power ratios is used to determine the target brightness of the light source output of the corresponding color, so as to mix the target colored light.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the color light mixing control method as described in any one of claims 1 to 7.
10. A lighting fixture, comprising: The light source and the electronic device of claim 9, wherein the light source comprises: a white sub-light source and color sub-light sources that respectively emit three source color lights, the electronic device being connected to the white sub-light source and the three color sub-light sources and configured to drive the corresponding sub-light sources to emit light according to the power ratio of each color, so as to mix the target color light.