Light emitting device, light mixing method, light mixing device, terminal device, and storage medium

Abstract

The application belongs to the technical field of RGB mixed light, and provides a light emitting device, a light mixing method, a light mixing device, a terminal device and a storage medium. B = 0.1474 ± 0.100, y B = 0.0330 ± 0.100; a green light source with a peak wavelength of 536nm ± 10nm and a half wave width greater than 100nm, color coordinates on a CIExyY chromaticity diagram are x G = 0.3899 ± 0.100, y G = 0.5381 ± 0.100; and a red light source with a peak wavelength of 630nm ± 10nm and a half wave width greater than 75nm, color coordinates on a CIExyY chromaticity diagram are x R = 0.6358 ± 0.100, y R = 0.3192 ± 0.100. The light emitting device provided by the application has high color rendering index and light efficiency of mixed white light.

Description

Technical Field

[0001] This application belongs to the field of RGB light mixing technology, and particularly relates to a light-emitting device, a light mixing method, a light mixing device, a terminal device, and a storage medium. Background Technology

[0002] RGB mixing technology adjusts the color of the mixed light emitted by a light source by changing the proportion of light emitted from the RGB three-color light sources (red (R), green (G), and blue (B) light sources).

[0003] Currently, RGB mixing technology mainly focuses on the number of colors of the mixed light emitted by the light source. Therefore, the half-width of the emission spectrum of RGB three-color light sources will be as narrow as possible in order to pursue a larger color gamut, resulting in a lower color rendering index and luminous efficacy of the mixed white light emitted by the light source. Summary of the Invention

[0004] In view of this, embodiments of this application provide a light-emitting device, a light-mixing method, a light-mixing apparatus, a terminal device, and a storage medium to solve the problem that existing RGB light-mixing technologies result in low color rendering index and luminous efficacy of the mixed white light emitted by the light-emitting device.

[0005] A first aspect of this application provides a light-emitting device, comprising:

[0006] A blue light source, wherein the peak wavelength of the blue light source is 440nm-470nm, and its color coordinate in the CIExyY chromaticity diagram is x. B =0.1474±0.100, y B =0.0330±0.100;

[0007] A green light source, wherein the peak wavelength of the green light source is 536nm±10nm, the half-width is greater than 100nm, and the color coordinate in the CIExyY chromaticity diagram is x. G =0.3899±0.100, y G =0.5381±0.100;

[0008] A red light source, wherein the peak wavelength of the red light source is 630nm±10nm, the half-width is greater than 75nm, and the color coordinate in the CIExyY chromaticity diagram is x. R =0.6358±0.100, y R =0.3192±0.100.

[0009] A second aspect of this application provides a light mixing method for a light-emitting device of the first aspect, comprising:

[0010] Based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is obtained; wherein, the chromaticity data includes color coordinates and luminance, and the RGB three-color light source includes the blue light source, the green light source and the red light source.

[0011] A third aspect of this application provides a light mixing device for the light-emitting device of the first aspect, comprising:

[0012] The duty cycle calculation module is used to obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device; wherein, the chromaticity data includes color coordinates and brightness, and the RGB three-color light source includes the blue light source, the green light source and the red light source.

[0013] A fourth aspect of this application provides a terminal device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the light mixing method provided in the second aspect.

[0014] A fifth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the light mixing method provided in the second aspect.

[0015] The first aspect of this application provides a light-emitting device, comprising: a peak wavelength of 440nm-470nm, and a color coordinate of x in the CIExyY chromaticity diagram. B =0.1474±0.100, y B A blue light source with a wavelength of 0.0330 ± 0.100; a peak wavelength of 536 nm ± 10 nm; a half-width at half-maximum (WWHM) greater than 100 nm; and a chromaticity coordinate of x in the CIExyY chromaticity diagram. G =0.3899±0.100, y G A green light source with a wavelength of 0.5381 ± 0.100; and a peak wavelength of 630 nm ± 10 nm, a half-width greater than 75 nm, and a color coordinate of x in the CIExyY chromaticity diagram. R =0.6358±0.100, y R A red light source with a color rendering index of 0.3192 ± 0.100. The combination of RGB three-color light sources with specific design parameters in the light-emitting device results in a high color rendering index and luminous efficacy of the mixed white light emitted by the device, and can meet the requirements of high color gamut colored light.

[0016] The second aspect of this application provides a light mixing method for a light-emitting device of the first aspect. By obtaining the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source in the light-emitting device based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device, the chromaticity data of the mixed light emitted by the light-emitting device tends to be consistent with the chromaticity data of the target color point when the RGB three-color light source is lit according to the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source, thereby driving the light-emitting device to emit mixed light with a color and brightness that tends to be consistent with the target color point according to actual needs. This results in the mixed white light emitted by the light-emitting device having a high color rendering index and luminous efficacy, and the emitted mixed colored light can meet the requirements of high color gamut colored light.

[0017] It is understood that the beneficial effects of the third and fourth aspects mentioned above can be found in the relevant descriptions in the second aspect above, and will not be repeated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first process of the light mixing method provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the second process of the light mixing method provided in the embodiments of this application;

[0021] Figure 3 This is a schematic diagram of the third process of the light mixing method provided in the embodiments of this application;

[0022] Figure 4 This is a schematic diagram of the fourth process of the light mixing method provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the fifth process of the light mixing method provided in the embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the structure of the light mixing device provided in the embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the structure of the terminal device provided in the embodiments of this application. Detailed Implementation

[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0027] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0028] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0030] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0032] This application provides a light-emitting device, including:

[0033] Blue light source, with a peak wavelength of 440nm-470nm, has a color coordinate of x in the CIExyY chromaticity diagram. B =0.1474±0.100, y B =0.0330±0.100;

[0034] The green light source has a peak wavelength of 536nm ± 10nm and a half-width greater than 100nm. Its color coordinates in the CIExyY chromaticity diagram are x. G =0.3899±0.100, y G =0.5381±0.100;

[0035] The red light source has a peak wavelength of 630nm ± 10nm and a half-width greater than 75nm. Its color coordinates in the CIExyY chromaticity diagram are x. R =0.6358±0.100, y R =0.3192±0.100.

[0036] In applications, the specific design parameters of the RGB three-color light source, such as the peak wavelength, half-width, and color coordinates in the CIExyY chromaticity diagram, can be selected within their respective value ranges according to actual needs. These specific design parameters of the RGB three-color light source enable the mixed white light emitted by the light-emitting device to have a high color rendering index and luminous efficacy, and can meet the requirements of high color gamut light.

[0037] In applications, RGB three-color light sources can include blue light chips, green light chips, and red light chips, which can be light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), or quantum dot light-emitting diodes (QLEDs), etc.

[0038] In one embodiment, the green light source includes a first blue light chip with a peak wavelength of 400nm-460nm, the surface of the first blue light chip is covered with a first encapsulation adhesive layer made of green light conversion material, and the luminous efficacy of the green light source is greater than 280 lumens per watt (lm / W).

[0039] In applications, green light sources can also be implemented based on green light chips. When a green light source is implemented based on a blue light chip and an encapsulation adhesive layer made of green light conversion material covering the surface of the blue light chip, the green light conversion material can be aluminate green phosphor, etc.

[0040] In one embodiment, the red light source includes a second blue light chip with a peak wavelength of 400nm-460nm, the surface of the second blue light chip is covered with a second encapsulation adhesive layer made of red light conversion material, and the luminous efficacy of the red light source is greater than 75lm / W.

[0041] In applications, red light sources can also be implemented using red light chips. When a red light source is implemented based on a blue light chip and an encapsulation adhesive layer made of red light conversion material covering the surface of the blue light chip, the red light conversion material can be potassium fluorosilicate (KSF) red phosphor, aluminate red phosphor, etc.

[0042] In one embodiment, when the light-emitting device emits white light with a color temperature of 2700K, the color rendering index is greater than 90, the luminous efficacy is greater than 150lm / W, the proportion of spectral energy emitted by the blue light source is in the range of 1% to 8%, the proportion of spectral energy emitted by the green light source is in the range of 40% to 50%, and the proportion of spectral energy emitted by the red light source is in the range of 45% to 55%.

[0043] In applications, the proportion of spectral energy of the RGB three-color light sources can be selected within their respective numerical ranges according to actual needs. Based on the special design of the peak wavelength, half-width, and color coordinates of the RGB three-color light sources in the CIExyY chromaticity diagram, the proportion of spectral energy emitted by the RGB three-color light sources is further specially designed, enabling the light-emitting device to emit white light with a color temperature of 2700K, a color rendering index greater than 90, and a luminous efficacy greater than 150lm / W.

[0044] This application also provides a light mixing method for a light-emitting device, which can be applied to any terminal device with data acquisition and processing functions, or simultaneously with data acquisition and processing functions and RGB three-color light source driving functions. Examples include the light-emitting device itself, a light source driver (e.g., an LED driver), or a computing device that is communicatively connected to the light-emitting device or the light source driver (wired or wireless communication connection). The computing device can be a wired controller, remote control, mobile phone, tablet computer, wearable device, in-vehicle device, augmented reality (AR) device, virtual reality (VR) device, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), desktop computer, etc. This application does not limit the specific type of terminal device.

[0045] like Figure 1 As shown, the light mixing method provided in this application embodiment includes the following steps S101 and S102:

[0046] Step S101: Obtain the chromaticity data of the target color point, and proceed to step S102.

[0047] In applications, the chromaticity data of the target color point can be input by the user using any human-computer interaction method supported by the terminal device. For example, the user can input chromaticity control commands through the input / output devices of the terminal device, and the terminal device will recognize and process the user's input chromaticity control commands into the corresponding chromaticity data of the target color point. The input / output devices can support multiple control methods such as voice control, touch control, and gesture control.

[0048] Step S102: Based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device, obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source.

[0049] In applications, chromaticity data includes chromaticity coordinates and luminance. The target chromaticity point is the point in the CIExyY chromaticity diagram whose chromaticity coordinates and luminance satisfy the Planck curve requirements. The spectral energy distribution data of the light-emitting device includes the spectral energy of the RGB three-color light source at each wavelength within the visible spectrum wavelength range of 380nm to 780nm. Table 1 below provides an example of standard spectral energy distribution data for a light-emitting device.

[0050] Table 1

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062] In Table 1, Represents the spectral energy of a blue light source. Represents the spectral energy of green light sources. E represents the spectral energy of a red light source, and E is an abbreviation for exponent.

[0063] In the application, Table 1 can exist in the form of a correspondence table. The correspondence table can be a look-up table (LUT) or it can exist in the form of finding and outputting the corresponding search results by inputting other data.

[0064] In applications, the terminal device can obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source in the light-emitting device based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device. This drives the RGB three-color light source to light up, making the chromaticity data of the mixed light emitted by the light-emitting device more consistent with the chromaticity data of the target color point. Users can input the chromaticity data of any target color point that meets the Planck curve requirements in the CIExyY chromaticity diagram into the terminal device according to actual needs. This allows the terminal device to drive the light-emitting device to emit mixed light with a color and brightness that are consistent with the target color point, thereby achieving chromaticity adjustment of the light-emitting device.

[0065] It should be understood that the standard spectral energy distribution data of the light-emitting device shown in Table 1 is merely exemplary. In application, the spectral energy of the RGB three-color light source at each wavelength in the spectral energy distribution data of the light-emitting device may deviate to a certain extent from the spectral energy shown in Table 1. The spectral energy in other spectral energy distribution data whose root mean square error between the spectral energy and the spectral energy in the standard spectral energy distribution data shown in Table 1 is within a preset error threshold is within the protection scope of this application. The preset error threshold can be set to any value in the range (0, 0.5) according to actual needs, for example, 0.1, 0.2, 0.3, 0.4, 0.5.

[0066] In one embodiment, the formula for calculating the root mean square error is:

[0067]

[0068] Where λ represents wavelength, φ ref φ and φ represent the spectral energy of any of the RGB three-color light sources at wavelength λ in the standard spectral energy distribution data and other spectral energy distribution data, respectively.

[0069] like Figure 2 As shown, in one embodiment, step S102 includes the following steps S201 to S203:

[0070] Step S201: Obtain the dominant wavelength of the target color point based on its chromaticity data, and proceed to step S202.

[0071] In the application, the terminal device uses an equal-energy white light source with color coordinates x0 = 0.333314 and y0 = 0.333288 in the CIExyY chromaticity diagram as a reference light source to calculate the dominant wavelength corresponding to the color of the target color point based on the color coordinates of the target color point.

[0072] Step S202: Based on the main wavelength and the spectral energy distribution data of the light-emitting device, obtain the brightness of the RGB three-color light source at the main wavelength, and proceed to step S203.

[0073] In application, the terminal device first finds the spectral energy of the RGB three-color light source at the corresponding wavelength in the spectral energy distribution data of the light-emitting device according to the dominant wavelength, and then calculates the brightness of the RGB three-color light source at the dominant wavelength based on the power and spectral energy of the RGB three-color light source.

[0074] Step S203: Based on the chromaticity data of the target color point and the chromaticity data of the RGB three-color light source at the main wavelength, obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source according to the Grassmann mixing principle.

[0075] In application, the brightness of the target color point = the duty cycle of the pulse width modulation signal required to drive the blue light source × the brightness of the blue light source at the dominant wavelength + the duty cycle of the pulse width modulation signal required to drive the green light source × the brightness of the green light source at the dominant wavelength + the duty cycle of the pulse width modulation signal required to drive the red light source × the brightness of the red light source at the dominant wavelength.

[0076] The x-coordinate of the target color point = the duty cycle of the pulse width modulation signal required to drive the blue light source × the sum of the tristimulus values ​​of the blue light source × the x-coordinate of the color coordinate of the blue light source + the duty cycle of the pulse width modulation signal required to drive the green light source × the sum of the tristimulus values ​​of the green light source × the x-coordinate of the color coordinate of the green light source + the duty cycle of the pulse width modulation signal required to drive the red light source × the sum of the tristimulus values ​​of the red light source × the x-coordinate of the color coordinate of the red light source.

[0077] The vertical coordinate of the target color point = the duty cycle of the pulse width modulation signal required to drive the blue light source × the sum of the tristimulus values ​​of the blue light source × the vertical coordinate of the blue light source + the duty cycle of the pulse width modulation signal required to drive the green light source × the sum of the tristimulus values ​​of the green light source × the vertical coordinate of the green light source + the duty cycle of the pulse width modulation signal required to drive the red light source × the sum of the tristimulus values ​​of the red light source × the vertical coordinate of the red light source;

[0078] By solving the above three formulas simultaneously, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source can be calculated.

[0079] In one embodiment, the formula for calculating the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is as follows:

[0080]

[0081] Where x and y represent the color coordinates of the target color point, Y represents the brightness of the target color point, and X, Y, and Z represent the tristimulus values ​​of the target color point;

[0082] η R x represents the duty cycle of the pulse width modulation signal required to drive the red light source. R y R The chromaticity coordinates of the red light source, Y R X represents the brightness of a red light source at the dominant wavelength. R Y R Z R D represents the tristimulus value of the red light source. R This represents the sum of the tristimulus values ​​of the red light source;

[0083] η G x represents the duty cycle of the pulse width modulation signal required to drive the green light source. G y G The chromaticity coordinates of the green light source, Y G X represents the brightness of a green light source at the dominant wavelength. G Y G Z G D represents the tristimulus value of a green light source. G This represents the sum of the tristimulus values ​​of a green light source;

[0084] η B x represents the duty cycle of the pulse width modulation signal required to drive the blue light source. B y B The chromaticity coordinates of the blue light source, Y B X represents the brightness of a blue light source at the dominant wavelength. B Y B Z B D represents the tristimulus value of the blue light source. B This represents the sum of the tristimulus values ​​of the blue light source.

[0085] In applications, the terminal device obtains the tristimulus values ​​X, Y, and Z of the target color point based on the conversion relationships between color coordinates and tristimulus values: x = X / (X+Y+Z), y = Y / (X+Y+Z), and z = Z / (X+Y+Z). X = x / y*Y and Z = (1-xy) / y*Y. Similarly, the tristimulus value X of the red light source can be obtained. R Y R Z R X R =xR / y R *Y R Z R =(1-x R -y R ) / y R *Y R The tristimulus value X of green light source G Y G Z G X G =x G / y G *Y G Z G =(1-x G -y G ) / y G *Y G The tristimulus value X of blue light source B Y B Z B X B =x B / y B *Y B Z B =(1-x B -y B ) / y B *Y B .

[0086] Figure 2 The corresponding embodiment provides a light mixing algorithm based on the Grassmann color mixing principle. Based on this algorithm, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source can be calculated simply, quickly and efficiently.

[0087] like Figure 3 As shown, in one embodiment, step S102 includes the following step S300:

[0088] Step S300: Based on the chromaticity data of the target color point and the transformation matrix obtained in advance based on the spectral energy distribution data of the light-emitting device, obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source.

[0089] In application, unlike Figure 2 The duty cycle calculation method in the corresponding embodiment can obtain the transformation matrix between the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source and the chromaticity data of the light source in advance based on the spectral energy distribution data of the light-emitting device. Then, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source can be obtained according to the chromaticity data of the target color point and the transformation matrix.

[0090] In one embodiment, the formula for calculating the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is as follows:

[0091]

[0092]

[0093] Where T represents the inverse of the transformation matrix, A represents the transformation matrix, and η R η represents the duty cycle of the pulse width modulation signal required to drive the red light source. G η represents the duty cycle of the pulse width modulation signal required to drive the green light source. B X represents the duty cycle of the pulse width modulation signal required to drive the blue light source, X, Y, and Z represent the tristimulus values ​​of the target color point, and Y represents the brightness of the target color point.

[0094] like Figure 4 As shown, in one embodiment, step S102 further includes the following steps S401 and S402 prior to step S300:

[0095] Step S401: Based on the brightness of the RGB three-color light source at each wavelength in the spectral energy distribution data of the light-emitting device, adjust the duty cycle of the pulse width modulation signal output to the RGB three-color light source and measure the chromaticity data of the light-emitting device, then proceed to step S402.

[0096] In the application, the terminal device calculates the brightness of the RGB three-color light source at each wavelength based on the spectral energy distribution data of the light-emitting device and the power of the RGB three-color light source. Then, it adjusts the duty cycle of the pulse width modulation signal output to the RGB three-color light source to make the brightness of the RGB three-color light source consistent with the calculated brightness of the RGB three-color light source at each wavelength. Then, it measures the chromaticity data of the mixed light emitted by the light-emitting device through measuring devices such as colorimeters and luminance meters. The terminal device actively acquires or receives the chromaticity data of the light-emitting device measured by measuring devices such as colorimeters and luminance meters.

[0097] Step S402: Based on the duty cycle of the pulse width modulation signal output to the RGB three-color light source at each wavelength and the chromaticity data of the light-emitting device, obtain the transformation matrix between the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source and the chromaticity data of the light-emitting device.

[0098] In the application, after obtaining the chromaticity data of the light-emitting device corresponding to each wavelength, the terminal device further calculates the transformation matrix between the duty cycle of the pulse width modulation signal actually output to the RGB three-color light source at all wavelengths and the chromaticity data of the light-emitting device actually measured, by solving the system of equations.

[0099] In application, after the transformation matrix is ​​calculated and stored in advance based on the actual measured data, when it is necessary to obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source can be quickly calculated based on the chromaticity data of the target color point and the transformation matrix obtained in advance based on the spectral energy distribution data of the light-emitting device.

[0100] In one embodiment, the transformation matrix is ​​calculated using the following formula:

[0101]

[0102] The transformation matrix is ​​solved using a pre-selected reference white point, and the solution formula is as follows:

[0103]

[0104] Where A represents the transformation matrix;

[0105] x R y R The chromaticity coordinates of the red light source, Y. R X represents the brightness of a red light source at the dominant wavelength. R Y R Z R This represents the tristimulus value of the red light source;

[0106] x G y G The chromaticity coordinates of the green light source, Y G X represents the brightness of a green light source at the dominant wavelength. G Y G Z G The tristimulus values ​​of a green light source;

[0107] x B y B The chromaticity coordinates of the blue light source, Y B X represents the brightness of a blue light source at the dominant wavelength. B Y B Z B This represents the tristimulus values ​​of the blue light source;

[0108] XW Y W Z W This represents the tristimulus value of the reference white point.

[0109] In applications, the reference white point can be a D65 light source, or other standard light sources can be selected as the reference white point according to actual needs, such as a D50 light source.

[0110] Figure 3 and Figure 4 The corresponding embodiment provides a light mixing algorithm based on a spatial transformation matrix. This method is similar to the matrix transformation method for converting the CIE 1931 RGB color space to the CIE 1931 XYZ color space. It calculates a unique spatial transformation matrix for a specific RGB three primary color spectrum. Using the spatial transformation matrix, the duty cycle of the pulse width modulation signal required to drive the RGB three color light source can be calculated simply, quickly and efficiently.

[0111] like Figure 5 As shown, in one embodiment, after step S102, the method further includes:

[0112] Step S103: Drive the RGB three-color light source to light up according to the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source, so that the chromaticity data of the light-emitting device is consistent with the chromaticity data of the target color point.

[0113] In applications, after the terminal device calculates the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point input by the user and the spectral energy distribution data of the light-emitting device, it can directly use the calculated duty cycle data to drive the RGB three-color light source to light up, so that the chromaticity data of the light-emitting device is consistent with the chromaticity data of the target color point, thereby making the color and brightness of the mixed light emitted by the light-emitting device meet the user's needs.

[0114] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0115] like Figure 6 As shown in the embodiments of this application, a light mixing device is also provided for performing the steps in the above-described light mixing method embodiments. The light mixing device may be a virtual appliance in a terminal device, run by the processor of the terminal device, or it may be the terminal device itself.

[0116] like Figure 6 As shown, the light mixing device 100 provided in this application embodiment includes:

[0117] The chromaticity data acquisition module 101 is used to acquire the chromaticity data of the target chromaticity point;

[0118] The duty cycle calculation module 102 is used to obtain the duty cycle of the pulse width modulation signal output to the RGB three-color light source based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device.

[0119] In one embodiment, the light mixing device further includes:

[0120] The driving module is used to drive the RGB three-color light source to light up according to the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source, so that the chromaticity data of the light-emitting device is consistent with the chromaticity data of the target color point.

[0121] In applications, the modules in the light mixing device can be software program modules, or they can be implemented through different logic circuits integrated in the processor, or they can be implemented through multiple distributed processors.

[0122] like Figure 7 As shown, this application embodiment also provides a terminal device 200 including: at least one processor 201 ( Figure 7 The diagram shows only one processor, memory 202, and computer program 203 stored in memory 202 and executable on at least one processor 201. When processor 201 executes computer program 203, it implements the steps in the various light mixing method embodiments described above.

[0123] In applications, terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that... Figure 7 This is merely an example of a terminal device and does not constitute a limitation on the terminal device. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input / output devices, network access devices, light source drivers, RGB three-color light sources, etc.

[0124] In applications, the processor can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0125] In applications, the memory may be an internal storage unit of the terminal device in some embodiments, such as the hard drive or RAM of the terminal device. In other embodiments, the memory may be an external storage device of the terminal device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the terminal device. The memory is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of a computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0126] It should be noted that the information interaction and execution process between the above-mentioned devices / modules are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0127] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is merely an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The functional modules in the embodiments can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules can be implemented in hardware or as software functional modules. Furthermore, the specific names of the functional modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0128] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various light mixing method embodiments above.

[0129] This application provides a computer program product that, when run on a terminal device, enables the terminal device to implement the steps described in the various light mixing method embodiments above.

[0130] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a camera terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, such as a USB flash drive, a portable hard drive, a magnetic disk, or an optical disk.

[0131] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0132] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0133] In the embodiments provided in this application, it should be understood that the disclosed terminal devices and methods can be implemented in other ways. For example, the terminal device embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0134] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] The above-described 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 spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for mixing light in a light-emitting device, characterized in that, include: Based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is obtained; wherein, the chromaticity data includes color coordinates and luminance, and the RGB three-color light source includes a blue light source, a green light source, and a red light source; According to the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source, drive the RGB three-color light source to light up, so that the chromaticity data of the light-emitting device is consistent with the chromaticity data of the target color point; The light-emitting device includes: The blue light source has a peak wavelength of 440nm-470nm and color coordinates of xB=0.1474±0.100 and yB=0.0330±0.100 in the CIExyY chromaticity diagram. The green light source has a peak wavelength of 536nm±10nm, a half-width of more than 100nm, and color coordinates of xG=0.3899±0.100 and yG=0.5381±0.100 in the CIExyY chromaticity diagram. The red light source has a peak wavelength of 630nm±10nm, a half-width of more than 75nm, and color coordinates of xR=0.6358±0.100 and yR=0.3192±0.100 in the CIExyY chromaticity diagram.

2. The light mixing method as described in claim 1, characterized in that, The green light source includes a first blue light chip with a peak wavelength of 400nm-460nm, the surface of the first blue light chip is covered with a first encapsulation adhesive layer made of green light conversion material, and the luminous efficacy of the green light source is greater than 280lm / W.

3. The light mixing method as described in claim 1, characterized in that, The red light source includes a second blue light chip with a peak wavelength of 400nm-460nm. The surface of the second blue light chip is covered with a second encapsulation adhesive layer made of red light conversion material. The luminous efficacy of the red light source is greater than 75lm / W.

4. The light mixing method according to any one of claims 1 to 3, characterized in that, When the light-emitting device emits white light with a color temperature of 2700K, the color rendering index is greater than 90 and the luminous efficacy is greater than 150lm / W. The proportion of spectral energy emitted by the blue light source is 1%~8%, the proportion of spectral energy emitted by the green light source is 40%~50%, and the proportion of spectral energy emitted by the red light source is 45%~55%.

5. The light mixing method as described in claim 1, characterized in that, The step of obtaining the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device includes: Based on the chromaticity data of the target color point, the dominant wavelength of the target color point is obtained; Based on the dominant wavelength and the spectral energy distribution data of the light-emitting device, the brightness of the RGB tri-color light source at the dominant wavelength is obtained; Based on the chromaticity data of the target color point and the chromaticity data of the RGB three-color light source at the dominant wavelength, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is obtained based on the Grassmann mixing principle.

6. The light mixing method as described in claim 5, characterized in that, The formula for calculating the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is as follows: Where x and y represent the color coordinates of the target color point, Y represents the brightness of the target color point, and X, Y, and Z represent the tristimulus values ​​of the target color point; R x represents the duty cycle of the pulse width modulation signal required to drive the red light source. R y R The chromaticity coordinates of the red light source are represented by Y. R X represents the brightness of the red light source at the dominant wavelength. R Y R Z R D represents the tristimulus value of the red light source. R This represents the sum of the tristimulus values ​​of the red light source; G x represents the duty cycle of the pulse width modulation signal required to drive the green light source. G y G The chromaticity coordinates of the green light source are represented by Y. G X represents the brightness of the green light source at the dominant wavelength. G Y G Z G D represents the tristimulus value of the green light source. G This represents the sum of the tristimulus values ​​of the green light source; B x represents the duty cycle of the pulse width modulation signal required to drive the blue light source. B y B The chromaticity coordinates of the blue light source are represented by Y. B X represents the brightness of the blue light source at the dominant wavelength. B Y B Z B D represents the tristimulus value of the blue light source. B This represents the sum of the tristimulus values ​​of the blue light source.

7. The light mixing method as described in claim 1, characterized in that, The step of obtaining the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device includes: Based on the chromaticity data of the target color point and the transformation matrix obtained in advance based on the spectral energy distribution data of the light-emitting device, the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is obtained; wherein, the transformation matrix is ​​the transformation matrix between the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source and the chromaticity data of the light-emitting device.

8. The light mixing method as described in claim 7, characterized in that, The formula for calculating the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source is as follows: Where T represents the inverse of the transformation matrix, and A represents the transformation matrix. R This indicates the duty cycle of the pulse width modulation signal required to drive the red light source. G This indicates the duty cycle of the pulse width modulation signal required to drive the green light source. B X represents the duty cycle of the pulse width modulation signal required to drive the blue light source, X, Y, and Z represent the tristimulus values ​​of the target color point, and Y represents the brightness of the target color point.

9. The light mixing method as described in claim 7, characterized in that, Before obtaining the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point and the transformation matrix obtained in advance based on the spectral energy distribution data of the light-emitting device, the process includes: Based on the brightness of the RGB three-color light source at each wavelength in the spectral energy distribution data of the light-emitting device, the duty cycle of the pulse width modulation signal output to the RGB three-color light source is adjusted and the chromaticity data of the light-emitting device is measured. Based on the duty cycle of the pulse width modulation signal output to the RGB three-color light source at each wavelength and the chromaticity data of the light-emitting device, a transformation matrix between the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source and the chromaticity data of the light-emitting device is obtained.

10. The light mixing method as described in claim 9, characterized in that, The formula for calculating the transformation matrix is ​​as follows: = = The transformation matrix is ​​solved using a pre-selected reference white point, and the solution formula is as follows: Where A represents the transformation matrix; x R y R The color coordinates of the red light source, X, are: R Y R Z R This represents the tristimulus value of the red light source; x G y G The color coordinates of the green light source, X, are: G Y G Z G This represents the tristimulus value of the green light source; x B y B The color coordinates of the blue light source, X, are represented by [value]. B Y B Z B This represents the tristimulus value of the blue light source; , , This represents the tristimulus value of the reference white point.

11. A light mixing device, characterized in that, include: The duty cycle calculation module is used to obtain the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source based on the chromaticity data of the target color point and the spectral energy distribution data of the light-emitting device; wherein, the chromaticity data includes color coordinates and brightness, and the RGB three-color light source includes a blue light source, a green light source and a red light source; The driving module is used to drive the RGB three-color light source to light up according to the duty cycle of the pulse width modulation signal required to drive the RGB three-color light source, so that the chromaticity data of the light-emitting device is consistent with the chromaticity data of the target color point; The light-emitting device includes: The blue light source has a peak wavelength of 440nm-470nm and color coordinates of xB=0.1474±0.100 and yB=0.0330±0.100 in the CIExyY chromaticity diagram. The green light source has a peak wavelength of 536nm±10nm, a half-width of more than 100nm, and color coordinates of xG=0.3899±0.100 and yG=0.5381±0.100 in the CIExyY chromaticity diagram. The red light source has a peak wavelength of 630nm±10nm, a half-width of more than 75nm, and color coordinates of xR=0.6358±0.100 and yR=0.3192±0.100 in the CIExyY chromaticity diagram.

12. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the light mixing method as described in any one of claims 1 to 10.

13. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the light mixing method as described in any one of claims 1 to 10.

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