CN101725843B - System and method for configuring LED backlight module with high color saturation - Google Patents

Abstract

The invention provides a system and a method for configuring an LED backlight module with high color saturation. The method comprises the following steps of: calculating a standard spectrum, wherein the standard spectrum is the spectrum of visible light transmitted by black-body radiation under a first color temperature; providing a transmission spectrum of an LED, a transmission spectrum of first fluorescent powder and a transmission spectrum of second fluorescent powder; according to the standard spectrum, adjusting the concentrations of the first fluorescent powder and the second fluorescent powder to obtain the first light mixed spectrum, and making the first light mixed spectrum closer to the standard spectrum; and making the first light mixed spectrum undergo color separation by a color filter to form a color coordinate of three primary colors, calculating an area formed by the color coordinate of three primary colors, and calculating a position of the color coordinate of the white light formed by the three primary colors. The method mainly uses the algorithms to calculate the concentrations of multiple fluorescent powder, so that after the light of the multiple fluorescent powder is mixed with the light of the LED, the backlight module with high color saturation is provided.

Description

System and method for configuring light-emitting diode backlight module with high color saturation

technical field

The invention relates to a light-emitting diode backlight module, in particular to a configuration system and method for a light-emitting diode backlight module with high color saturation.

Background technique

Light Emitting Diode (LED for short) is an electronic component that can convert electrical energy into light energy, and also has the characteristics of a diode. Generally, when DC power is supplied, the LEDs will emit light steadily, but if AC power is connected, the LEDs will flash, and the frequency of the flashing depends on the frequency of the input AC power. The light-emitting principle of light-emitting diodes is to apply an external voltage to make electrons and holes combine in the semiconductor to release energy in the form of light.

At present, the composition of the light emitting diode chip mainly includes group III arsenide, group III phosphide, group III nitride or semiconductor compound of group II-VI. With the different manufacturing materials of LED chips, the energy of photons produced is also different. Therefore, the wavelength of light-emitting diode chips is controlled by manufacturing materials, and various LED chips with different spectra and colors can be produced. At present, the global industry has developed different types of light-emitting diode chips that can emit light of different wavelengths from infrared to blue light, and the technology of light-emitting diode chips from purple to ultraviolet light is also maturing. The main focus of the above LEDs is on monochromatic light, or LEDs of a single frequency. The light-emitting spectrum of white light-emitting diodes is no longer concentrated on a certain monochromatic light, but has a distribution in the spectrum of visible light. At present, the combinations used to form white light emitting diodes are mainly divided into two types: multi-chip type and single-chip type.

The multi-chip type uses red, green and blue light-emitting diode chips to mix the three kinds of light with the help of a lens to produce the white light we see. Its advantages are high luminous efficiency and adjustable light color. The disadvantage is that three types of chips are required, each chip has its own circuit design, and the attenuation rate and lifespan of the three chips are not the same. It is difficult to control the lifespan of white light emitting diodes.

In addition, there are three ways to generate white light in a single-chip type. The first way, which is also the mainstream way, is to irradiate yellow phosphor powder with a blue light-emitting diode chip to excite the phosphor powder to emit white light. For such products, when adjusting the CIE value of the light-emitting diode, it is only necessary to select the wavelength of the blue light-emitting diode and the excitation spectrum of the yellow phosphor, and then adjust the luminous intensity of the blue light-emitting diode and the concentration of the yellow phosphor. In the spectrum generated by such a white light emitting diode, the luminosity in the red region is too weak, resulting in a low average color rendering coefficient (General Color Rendering Index; Ra). For example, when this product is applied to a backlight, the displayed pattern often has no red color. Therefore, white light-emitting diodes with high color rendering have become the direction pursued by all walks of life at this stage.

In order to make up for the luminosity in the red area, the second way is to irradiate green and red phosphors with blue LED chips or irradiate green and yellow phosphors with blue LED chips to generate white light and improve the average color rendering coefficient. The third way is to irradiate green, red and blue three kinds of phosphors with ultraviolet light-emitting diode chips to generate white light.

In the above method, the LED backlight module that wants to achieve high color saturation can be manufactured by adding red phosphor or using more than two phosphors. However, when two kinds of phosphors are used to mix light to make the light emitting diode produce a light source with a specific CIE value, there are a total of three parameters that need to be adjusted at the same time, that is, the luminous intensity of the light emitting diode and the concentration of the two phosphors. In order to improve the color saturation of using the LED as the backlight source, several trial-and-error methods are required to adjust the concentration ratio of different phosphors and the luminous intensity of the blue LED.

In addition, the light emission spectrum of the light emitting diode will be related to the temperature. When the so-called junction temperature is higher, the peak wavelength of the light emitting spectrum of the light emitting diode will also shift to longer wavelength. As the operating time of the LED increases, the temperature of the element also increases. Therefore, under long-term operation, the light-emitting frequency of the light-emitting diode will also change accordingly. In addition, the manufacturing process of the LEDs will have spectrum distribution, so the LEDs will be binned, which will greatly increase the manufacturing cost of the LEDs.

The US Patent Publication No. US2006/0290624 mainly aims to solve this problem. The method of this technology is to calibrate one of the three primary colors first. For example, for green, at least two light-emitting diodes will be provided, one of which has a slightly higher wavelength than green light, and the other light-emitting diode has a slightly lower wavelength than green light. . Then use the control circuit to make the two light-emitting diodes mix the light to get the correct wavelength of green light required. When the operating time increases, the luminous spectrum of the two LEDs may change. If the sensor detects the change of the excitation spectrum, the control circuit will control the luminous intensity of the two LEDs so that the final mixed light spectrum remains the same. stay the same. When one of the three primary colors can be adjusted, the light-emitting diodes of the three primary colors can be adjusted respectively.

The whole technology is theoretically feasible, but commercially such a design will greatly increase the production cost. First of all, three control circuits and three sensors are required for the three primary colors. Additionally, at least two types of LEDs would be required for each color LED. The LEDs of three primary colors need six kinds of LEDs to be calibrated, which will greatly increase the cost of manufacturing and managing the LEDs. Furthermore, the problem that the lifetime of each light-emitting diode is not the same will increase the problem of the lifetime of the product again.

Another way is to use light-emitting diodes to excite phosphors to emit light. Phosphor powder has the following advantages over light-emitting diodes using three primary colors. When the emission spectrum of the light-emitting diode changes, only the absorption spectrum changes for the phosphor. As long as the excitation spectrum of the light-emitting diode still falls within the absorption spectrum of the phosphor, the excitation spectrum of the phosphor will not change accordingly. It seems that using phosphor is a good choice.

In Taiwan Patent Publication No. 200627678, it has been mentioned that ultraviolet light or purple light emitting diodes are used to excite three primary color phosphors. Such a method can greatly increase the color rendering of the LED light source and provide better NTSC chromaticity when used as a backlight of a liquid crystal display.

Taiwan announcement number 200830508 proposes to use red phosphor to increase NTSC. The red phosphor used is CaAlSiN ₃ : Eu, and the green phosphor (Ba _x Sr _1-x ) ₂ SiO ₄ : Eu (x≧0.5).

The above-mentioned methods all mention the use of multiple phosphors to enhance the NTSC of the light-emitting diode. However, there are a few issues that need to be addressed. First, the mixing ratio of phosphor powder is mostly a trial and error method, which will increase a lot of research and development time; second, the filter spectrum of each color filter is not the same, for LED manufacturers In other words, different phosphor ratios are required to improve color saturation, which will add more trial and error time.

When more and more types of phosphors are developed on the market, or it is desired to use more than two types of phosphors for mixed light, the development time of the LED backlight module is also short. longer and longer. It is undoubtedly a considerable challenge for the launch of the product.

Contents of the invention

An object of the present invention is to use software calculations to quickly deploy a method and system for mixing a variety of fluorescent powders into a high-color-saturation light-emitting diode backlight module, so as to reduce the time cost of trial and error.

In view of the above-mentioned background of the invention, in order to meet the needs of industrial interests, the present invention provides a method for configuring a high-color-saturation light-emitting diode backlight module. The steps include first calculating a standard spectrum, wherein the standard spectrum is at a first color temperature. The spectrum of visible light emitted by blackbody radiation. Afterwards, an emission spectrum of the LED, an emission spectrum of the first phosphor and an emission spectrum of the second phosphor are provided. A first mixed light spectrum is obtained by adjusting the concentration of the first phosphor and the second phosphor according to the standard spectrum, so that the first mixed light spectrum is close to the standard spectrum. Then, the first mixed light spectrum is separated into the color coordinates of the three primary colors through a color filter, and the area formed by the color coordinates of the three primary colors is calculated, and the color coordinate position of the white light composed of the three primary colors is calculated.

The present invention also provides a method for configuring a high-color-saturation LED backlight module. The steps include first calculating a standard spectrum, and the standard spectrum is a visible light spectrum emitted by black body radiation at a first color temperature. Afterwards, an emission spectrum of the LED, an emission spectrum of the first phosphor and an emission spectrum of the second phosphor are provided. A first mixed light spectrum is obtained by adjusting the concentration of the first phosphor and the second phosphor with the help of the standard spectrum. The mixed light spectrum is separated into red, green and blue chromaticity coordinates through a color filter, and then the area formed by the red, green and blue chromaticity coordinates is calculated, and red, green, and blue are synthesized The chromaticity coordinate position of blue white light.

The present invention also provides a system for configuring a high-color-saturation light-emitting diode backlight module, including a first database, a standard spectrum generator, a first color mixing unit, a second color mixing unit, a spectrum comparison unit, and a second database, a filter unit and a color saturation calculation unit. The above-mentioned first database is used to provide a light emission spectrum of an LED, a light emission spectrum of a first phosphor, and a light emission spectrum of a second phosphor. The above-mentioned standard spectrum generator is used to generate the visible light spectrum emitted by the black body radiation at a first color temperature. The above-mentioned first color mixing unit is used to calculate the light mixing spectrum of the light emitting diode, the first phosphor and the second phosphor in the first database, wherein the light mixing spectrum is a first light mixing spectrum. The above spectrum comparison unit is used for comparing the first mixed light spectrum with the standard spectrum generated by the standard color temperature spectrum generator. The above-mentioned second database is used to store a filter spectrum of a color filter. The above-mentioned filtering unit calculates the color coordinates of the three primary colors of the first light mixing spectrum with the aid of the filtering spectrum of the second database. The above-mentioned color saturation calculation unit is used to calculate the area formed by the color coordinates of the three primary colors. The above-mentioned second color mixing unit is used to calculate the color coordinates of the white light after the three primary colors are mixed.

The present invention also provides a method for calculating the concentration of multiple phosphors to obtain a high color saturation LED backlight module, including adjusting the concentration of multiple phosphors so that the spectrum after mixing with an LED is close to a blackbody at a first color temperature The luminescence spectrum is radiated, and the mixed light spectrum is separated into three primary colors through a color filter, so that the area formed by the chromaticity coordinates of the three primary colors and the white light color coordinates can meet the requirements.

The present invention also provides a method of using a two-stage approximation to find out the blending ratio of various phosphors in a high-color-saturation light-emitting diode backlight module, including blending the blending ratio of various phosphors close to black body radiation, and from a The composition area of the color coordinates of the three primary colors separated by the color filter and the color coordinates of the white light correct the blending ratio of the various phosphors.

Wherein the above-mentioned steps, means, or systems for calculating the standard spectrum are calculated by using Planck's equation. The above-mentioned first mixed light spectrum is obtained by excitation and radiation of the light-emitting diode, the first phosphor, and the second phosphor. Wherein the above-mentioned first phosphor can be CaSc ₂ O ₄ : Ce, (MgCaSrBa) ₂ SiO ₄ : Eu, Ca ₃ Sc ₂ Si ₃ Ol ₂ : Ce, (Ca _1.47 Mg _1.5 Ce _0.03 )(Sc _1.5 Y _0.5 ) Si ₃ Ol ₂ or (Ca _2.97 Ce _0.03 )Sc ₂ (Si, Ge) ₃ O ₁₂ . The above-mentioned second phosphor can be CaAlSiN ₃ :Eu, (CaEu)AlSiN ₃ , (SrCa)AlSiN ₃ :Eu or SrGa ₂ S ₄ :Eu. The present invention may include a third phosphor and its emission spectrum.

Utilizing the means of the present invention can achieve the effect of quickly deploying the LED backlight module with high color saturation, and can greatly reduce the time cost of trial and error.

Description of drawings

Figure 1 shows a schematic diagram of CIE1931 chromaticity;

Figure 2 shows a schematic diagram of CIE1931 chromaticity coordinates of NTSC standard and general backlight;

Fig. 3 shows a flow chart of a method for calculating the concentration of multiple phosphors of the present invention to obtain a high color saturation LED backlight module;

Fig. 4 shows a flow chart of a method for configuring a high-color-saturation light-emitting diode backlight module of the present invention;

Fig. 5 shows a system block diagram of a configuration of a high-color-saturation light-emitting diode backlight module of the present invention;

Fig. 6 shows the flow chart of the preparation method of the high color rendering white light emitting diode of the present invention;

Fig. 7 shows the block diagram of the preparation system of high color rendering white light-emitting diodes according to the present invention for comparison of emission spectrum similarity;

Fig. 8 shows a schematic diagram of a light-emitting diode chip and a mixed emission spectrum of two different phosphor concentrations;

Fig. 9 shows the filter spectrogram of color filter;

FIG. 10 shows a block diagram of a preparation system of a high color rendering white light emitting diode with a color rendering coefficient ratio; and

Fig. 11 shows a system block diagram of a configuration of high color rendering white light emitting diodes of the present invention; and

FIG. 12 shows a schematic diagram of CIE1931 chromaticity coordinates of the high color saturation LED backlight module of the present invention, NTSC standard, and a general backlight.

Wherein, the reference signs are explained as follows:

0 completed 31-32 steps

Steps 41-45 51 First database

52 The first color mixing unit 53 Standard color temperature spectrum generator

54 spectrum comparison unit 55 second database

56 filter units 57 color saturation calculation units

58 Second color mixing unit 61-65 steps

71 Black body radiation generator for target color temperature 72 First database

73 spectrum calculation unit 74 spectrum comparison unit

76 Adjust the concentration of phosphor 77 Re-select phosphor

100 target color temperature black body radiation generation 101 first database

device

102 spectrum computing unit 103 second database

104 color saturation computing units 105 color mixing computing units

106 Comparing unit 108 Adjusting the concentration of fluorescent powder

109 reselect phosphor

Spectrum Generator for Black Body Radiation at 110 Target Color Temperature

111 First database 112 Spectrum calculation unit

113 Spectrum comparison unit 114 First-order approximation

115 color separation unit 116 second database

117 Three primary color chromaticity coordinate calculation unit 118 Three primary color light mixing unit

119 Second order approximation

Detailed ways

The direction of the present invention discussed here is a method and system for a high-color-saturation light-emitting diode backlight module. In order to provide a thorough understanding of the present invention, detailed steps and components thereof will be set forth in the following description. Obviously, the implementation of the present invention is not limited to specific details familiar to those of ordinary skill in the method and system of high color saturation LED backlight modules. On the other hand, well-known components or steps have not been described in detail so as not to unnecessarily limit the invention. Preferred embodiments of the present invention are described in detail below, however, the present invention can be widely practiced in other embodiments besides these detailed descriptions, and the scope of the present invention is not limited, which is subject to the following claims.

It can be seen from the above that one of the important elements for generating white light is a fluorescent material. The luminescence of fluorescent materials means that after the phosphor is excited by different excitation sources such as light, electric field, and electron beam, the electrons of the phosphor can obtain enough energy to transition from the ground state energy level to a higher energy excited state energy level. Since the electrons in the high-energy excited state are relatively unstable, they will return to the low-energy ground state in a relaxation manner. During the mitigation process, if the energy is released in a non-radiative way, the vibration of the crystal lattice will be generated, and the energy will be consumed in the form of "heat". If released in the form of electromagnetic radiation (radiative), the energy is released in the form of light. If the wavelength of the emitted light falls within the range of visible light, the human eye can see the light emitted by the phosphor. The light emitted by the phosphor is only related to the transition of electrons between high and low energy levels.

Phosphor powder used in light emitting diodes is mainly composed of host lattice (H), such as ZnS:Cu ²⁺ , wherein ZnS is the host lattice. The luminescent center in the phosphor is formed by adding or doping a small amount of different ions in the host lattice, such as Cu ²⁺ in ZnS:Cu ²⁺ . Thus, the heterogeneous ions are centrosomes that can be excited and generate fluorescence, also known as activators or activators. Sometimes in fluorescent materials, a second heterogeneous ion is added to the host lattice to transfer the absorbed excitation energy to the active center ion and emit light, which is called a sensitizer or an auxiliary activator (co- activator). Therefore, it is possible to design various phosphors emitting various wavelengths by controlling the host lattice and the active center. At present, the main materials of fluorescent powders available on the market are mostly composed of sulfides, oxides, oxysulfides, nitrides, oxynitrides, garnet ) and silicates (Silicates) and so on.

The white light that most people refer to refers to the sunlight seen during the day. After theoretical analysis, it is found that the white light contains a continuous spectrum in the range of 400nm to 700nm. In terms of visual color, it can be broken down into seven colors: red, orange, yellow, green, blue, indigo, and purple. According to the light-emitting principle of light-emitting diodes, generally only monochromatic light can be emitted. In order for it to emit white light, it is technically necessary to mix two or more complementary colors of light to achieve the purpose of white light. In addition to producing white light, the ability of white light-emitting diodes to show the fidelity of the object's color is called color rendering (Color Rendering) is also a part that must be considered technically. The light source with high color rendering performance is more realistic to the color of the object, and the object color presented by the illuminated object to the human eye is also closer to the natural primary color. The color rendering index (CRI) of white light-emitting diodes is related to the LED chips, phosphors and materials. Under different color temperatures, the phosphors or LED chips used will be different.

The definition of color temperature (Color Temperature) is based on the black body (Black body) radiation, when the metal (close to the black body) is heated to a certain temperature, it will show colored visible light. This light changes as the temperature increases, and the temperature that affects this light source is called the color temperature of the light source. For example, when a piece of iron is heated, at first the iron will turn red, then orange, then yellow, and then blue-white. The researchers used a continuous spectrum to verify the relationship between its temperature and color. Suppose the x-axis is the wavelength, and the y-axis represents the radiation flux. When the y-axis reflects the amount of radiation of different wavelengths, the curve of the energy released by iron at different temperatures can be drawn. Therefore, when iron turns red, it does not mean that it only emits red light, but that it emits more red light than other wavelengths. From this experiment, three characteristics are found: 1. The curve has a peak point; 2. When the temperature increases, the peak point will move to the short-wave direction; 3. When the temperature increases, the radiation flux of all wavelengths will increase. For example, iron emits the most red light at 4200K, and the peak point of radiation flow is at the red light, so we see iron as red, and at 4800K, the peak point of radiation flow is orange-yellow. So we see that iron is orange-yellow, because when the temperature increases, the peak point will move to the short wave direction, so at 5800K, the peak point will move to yellow-green.

In the calculation of color temperature, the absolute temperature Kelvin (K) is used as the unit, and the black body radiation is calculated with Kelvin = Celsius + 273 as the starting point. Assuming that a pure black object can absorb all the heat falling on it without loss, and at the same time release all the energy generated by the heat in the form of "light", it will be affected by the level of heat. into different colors. For example, when the black body receives heat equivalent to 500-550°C, it will turn dark red, and when it reaches 1050-1150°C, it will turn yellow. Therefore, the color composition of the light source corresponds to the thermal temperature of the black body. It's just that the color temperature is represented by the Kelvin (K) color temperature unit instead of the Celsius temperature unit. When a black body is heated so that it can emit all visible light waves in the spectrum, it becomes white, and the tungsten filament in the bulb we use is quite close to this black body. The algorithm of the color temperature meter is based on the above principle, using K to represent the color of the light emitted by the heated tungsten wire. The K temperature unit represents the color temperature of the light emitted by the heated tungsten wire. According to this principle, the color temperature of any light is equivalent to the "temperature" received by the above-mentioned black body emitting the same color. This temperature can find its corresponding point on the Planck locus of the chromaticity diagram. The curve of the black body will only be changed by the temperature, not by other factors such as the composition of the black body. Therefore, no matter the black body of any composition, as long as it is At the same temperature, there will be the same curve.

Due to the great changes in natural light source, color, time, weather, observation direction, season and geographical location, it is extremely inconvenient to evaluate the color, so the International Commission on Illumination (Commission International de 1′Eclairage, referred to as CIE). In 1930, various standard light sources that were very close to natural light were established.

In addition, the International Commission on Illumination formulated a specification called "1931CIE Standard Observer" based on the mathematical model of vision and the results of color matching experiments. In fact, it is a set of color matching functions represented by three curves, so many documents are also called "CIE1931 standard matching function", as shown in Figure 1. The CIE1931 chromaticity diagram is a CIE chromaticity diagram represented by nominal values, where x represents the red component and y represents the green component. In the chromaticity diagram (chromaticity diagram), the range of the horseshoe is all the colors of the visible spectrum, and the edge of the horseshoe is the saturated monochromatic wavelength. This system uses light color coordinates (x, y, z) to indicate the relative proportion of a certain color that can be combined from the three primary colors (there are only x and y coordinates in the figure, and z can be derived from the identity x+y+z=1). The white light in the middle has coordinates of (0.33, 0.33). The colors surrounding the edge of the color space are the spectral colors, the border represents the maximum saturation of the spectral color, the numbers on the border represent the wavelength of the spectral color, and its outline contains all the perceived hues. All monochromatic light is located on the tongue-shaped curve, this curve is the monochromatic locus, and the numbers marked beside the curve are the wavelength values of monochromatic (or called spectral color) light. Every actual color in nature lies within this closed curve.

NTSC is a color television broadcast standard formulated by the National Television System Committee (National Television System Committee, abbreviated as NTSC) in December 1952. NTSC belongs to the simultaneous system, the frame rate is 29.97fps per second, the scanning line is 525, progressive scanning, the aspect ratio is 4:3, and the resolution is 720x480. The chrominance signal modulation of this system includes balanced modulation and quadrature modulation, which solves the compatibility problem of color black and white TV broadcasting.

FIG. 2 shows a schematic diagram of CIE1931 chromaticity coordinates of NTSC standard and general backlight. It can be seen in Figure 2 that the colors defined by NTSC can be represented in CIE by the area enclosed by the three coordinates of the three primary colors. In Figure 2, it is the area surrounded by three square points. At present, white light-emitting diodes are generally used as the backlight source of liquid crystal displays, and the color saturation that can be provided is smaller than the standard area of NTSC in FIG. 2 . Therefore, the color saturation that can be provided is poor.

The calculation of black body radiation was proposed by J. Stefan in 1879. The total energy (E) of black body radiation is proportional to the fourth power of absolute temperature (T), E=aT ⁴ , which is the so-called Stephen-Boltzmann law (Stefan-Boltzmann law).

In 1893, Wien further calculated the change of the wavelength of radiant energy, and found that the change of wavelength λ is proportional to the temperature. If we quote Stefan-Boltzmann law and the adiabatic process formula in thermodynamics, we can get Wien displacement law, Tλ _max = constant.

In 1896, Wien obtained a semi-empirical formula from the consideration of the general theory of thermodynamics and the analysis of experimental data as

_ρv = αv ³ exp(βv/T)

Where _ρv is the radiant energy density, v is the frequency, T is the absolute temperature, and α and β are constants.

In 1900, J.W.Rayleigh and J.H.Jeans derived a black body radiation formula based on classical electrodynamics and statistical physics theory, namely Rayleigh-Jeans law:

${\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; v</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; \&kappa;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}\mathrm{<span\; class="notranslate">\; T</span>}$

Where c is the speed of light, k=Boltzmann's constant. But this formula is consistent with the experimental curve in the low frequency part, but when v→∞, _ρv →∞ diverges, which obviously does not match the experiment, which is the "ultraviolet disaster" in classical physics.

Later, more detailed and comprehensive experiments showed that the Wien formula did not agree well with all experimental data. In the long wave band, the Wien formula deviates significantly from the experiment. At the end of 1900, the German physicist M. Planck found a formula that can be consistent with the experimental data, namely

${\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; \&pi;h</span>}{\mathrm{<span\; class="notranslate">\; v</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; hv</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&kappa;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}$

or

${\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; \&pi;hc</span>}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; 5</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; hc</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}{\mathrm{<span\; class="notranslate">\; \&kappa;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}$

Wherein h is Planck's constant, the size is h=6.626x10-34J·s. Rayleigh-Jeans law, Wien displacement law, and Stefan-Boltzmann law can be successfully explained and derived from Planck's hypothesis.

Due to different color temperatures, factors such as LED chips and phosphors all affect the color rendering of the white light emission spectrum, it is often necessary to cross test the various influencing factors many times during the test process, and it takes a lot of time and effort to obtain a white light emitting diode with high color rendering performance. cost. In order to solve the above-mentioned problems, the inventor further created and invented a white light-emitting diode with high color rendering performance in a high-efficiency manner based on the above-mentioned principle of black body radiation and the derived Planck's law. A preparation method and system for white light emitting diodes with high color rendering performance by using a variety of fluorescent powders mixed.

The method of the present invention is to use two-stage approximation to find out the deployment ratio of various phosphors in the high color saturation LED backlight module. The first-stage approximation is mainly to adjust the mixing ratio of various phosphors close to black body radiation, while the second-stage approximation is mainly to judge the color saturation and the color coordinate position of white light from the color separation of the color filter.

Please refer to FIG. 3 , which shows a method of calculating the concentration of multiple phosphors to obtain a high color saturation LED backlight module according to the present invention. In the first step (31), the concentration of the multiple fluorescent powders is firstly adjusted so that the spectrum after mixing with a light emitting diode is close to the black body radiation emission spectrum at a first color temperature. The aforementioned light emitting diodes may be ultraviolet light emitting diodes, purple light emitting diodes, or blue light emitting diodes. Multiple phosphors can have two or more phosphors, which are determined by the color light of the light-emitting diodes. For example, when using ultraviolet light or violet light-emitting diodes, at least three colors of phosphors need to be used at the same time to mix white light. When using blue light-emitting diodes, at least two colors of phosphors need to be selected to mix white light with high color rendering. Afterwards, the second step (32) finds out the color coordinates of the three primary colors after the mixed light spectrum passes through the color filter, and checks the area formed by the color coordinates of the three primary colors and the color coordinate position of the white light synthesized by the three primary colors.

In the process referring to FIG. 3 , the present invention also provides a method for configuring a high color saturation LED backlight module. Please refer to FIG. 4 for the detailed process. Firstly, the first step (41) calculates a standard spectrum, wherein the standard spectrum is the visible light spectrum emitted by black body radiation at a first color temperature. Meanwhile, in the second step (42), an emission spectrum of a light emitting diode, an emission spectrum of a first phosphor and an emission spectrum of a second phosphor are provided. Afterwards, in the third step (43), the concentration of the first phosphor and the second phosphor is adjusted by means of the standard spectrum to obtain a first mixed light spectrum, so that the first mixed light spectrum is close to the standard spectrum. Next, please refer to the fourth step (44), the first mixed light spectrum is separated into the color coordinates of the three primary colors through a color filter, and the area formed by the color coordinates of the three primary colors is calculated. Color filters are filters used in liquid crystal displays that divide into three primary colors. The larger the area formed by the color coordinates of the three primary colors, the better the color saturation of the LCD screen. This step is used to detect color saturation. If the color saturation is not good, the concentration of the phosphor is readjusted. Then, in the fifth step (45), the color coordinate position of the white light composed of three primary colors is calculated. When the color coordinates of white light are in the wrong position, the ratio of phosphors must be readjusted. Even, it is possible to adjust the color coordinate position of black body radiation whose color coordinates of white light are at a certain color temperature. In FIG. 4, only two kinds of phosphors are used to represent the embodiment of the present invention. However, the third phosphor, the fourth phosphor, and even the fifth phosphor can be applied to the present invention at the same time.

According to the flow chart in FIG. 4 , the present invention also provides a system for configuring a high-color-saturation LED backlight module. Please refer to FIG. 5 for details. A first database (51) is used to store an emission spectrum of a light emitting diode, a first phosphor emission spectrum and a second phosphor emission spectrum. A first color mixing unit (52) is used to calculate the light mixing spectrum of the light emitting diode, the first phosphor and the second phosphor in the first database (51), wherein the light mixing spectrum is a first light mixing spectrum. A standard color temperature spectrum generator (53), used to generate the visible light spectrum emitted by black body radiation at a first color temperature. A spectrum comparison unit (54), used for comparing the first mixed light spectrum with the standard spectrum generated by the standard color temperature spectrum generator (53). When the spectrum comparison unit (54) judges that the first mixed light spectrum is close to the visible light spectrum emitted by black body radiation at the first color temperature, the data of the first mixed light spectrum is sent to the next stage. If the comparison result is not close, the first color mixing unit (52) will recalculate the first color mixing spectrum until the comparison result is close.

Please continue to refer to FIG. 5 , a second database ( 55 ) is used to store a filter spectrum of a color filter, wherein the color filter is used as a dichroic filter of a liquid crystal display. A filtering unit (56), which calculates the color coordinates of the three primary colors of the first mixed light spectrum by means of the filtered light spectrum of the second database. A color saturation calculation unit (57), used for calculating the area formed by the color coordinates of the three primary colors. When the area is small compared to the area defined by NTSC, or compared to the standard of commercially defined color saturation, then return to the first color mixing unit (52) to recalculate the first color mixing spectrum until Can meet the requirements of the color saturation calculation unit (57). The second color mixing unit (58) is used for calculating the color coordinates of the white light after the three primary colors are mixed. When the color coordinate position of white light deviates from the generally defined white light color coordinate, it is necessary to return to the first color mixing unit (52) to recalculate the first color mixing spectrum until the requirement of the second color mixing unit (58) can be passed. In the present invention, it can also be set that the color coordinates of white light must fall within the set color temperature of black body radiation, for example, the color coordinates of white light with a color temperature of 6500K.

The following related diagrams will be used to describe various preferred embodiments of the present invention in detail. Fig. 6 is a flowchart of a preparation method of a high color rendering white light emitting diode. In the first step (61), the visible light spectrum radiated by the black body at a specific color temperature is calculated. In this example, the Planck equation

${\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}\mathrm{<span\; class="notranslate">\; \&pi;hc</span>}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}^{\mathrm{<span\; class="notranslate">\; 5</span>}}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; hc</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&lambda;\&kappa;</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}$

Calculates the visible spectrum of black body radiation for the target color temperature. However, from the development background of the above-mentioned black body radiation, the Rayleigh-Jeans equation, the Stefan-Boltzmann equation, or the Wien equation can also be applied as the spectrum of the simplified black body radiation. Set a target color temperature and use Planck's Law to calculate the spectrum of the color temperature (the color temperature can range from 2500K to 8000K), which is the visible light spectrum of the black body radiation of the target color temperature. In this step, the visible light spectrum of the black body radiation at the target color temperature is represented by T _a (λ).

The second step (62) is to provide the emission spectrum of the known LED chip, the emission spectrum of the first phosphor powder and the emission spectrum of the second phosphor powder. When there are more than two kinds of phosphors, it is necessary to provide the emission spectra of all phosphors. In this step, the emission spectrum measured by the LED chip is represented by L(λ); the emission spectrum measured by the first phosphor is represented by P1(λ); and the emission spectrum measured by the second phosphor is represented by P2(λ )express.

The third step (63) is to adjust the concentration of all phosphors according to the visible light spectrum radiated by the black body at a certain color temperature calculated in the first step, and then calculate the concentration of the light-emitting diode chip, the first phosphor and the second phosphor Mixed emission spectrum after concentration mixing. One calculation method is described in equation (2):

C _a (λ)=a×L(λ+Δλ)+b×P1(λ+Δλ)+c×P2(λ+Δλ)

beg $\underset{\mathrm{\&lambda;}}{\mathrm{\&Sigma;}}{|T_a\left(\mathrm{\&lambda;}\right)-C_a\left(\mathrm{\&lambda;}\right)|}^2$ (a, b, c) which is a minimum value for the visible light spectrum

(2)

Wherein, the hybrid emission spectrum is represented by C _a (λ);

The luminous intensity of the light emitting diode chip is represented by a;

The concentration of the first phosphor is represented by b; and

The concentration of the second phosphor is represented by c.

The above method is one of the calculation methods, but anyone skilled in the art should be able to use other equations to calculate the concentration of each phosphor. The light mixing spectrum C _a (λ) calculated in the above manner is the first light mixing spectrum.

The fourth step (64) is to calculate the area formed by the chromaticity coordinates of the first mixed light spectrum separated into red, green, and blue primary colors by a color filter. First, the first mixed light spectrum is color-separated into red, green and blue according to the filtering spectrum of the color filter. Then, calculate the color coordinates of red, green and blue in CIE. With the color coordinates of red, green and blue, the area enclosed by the CIE coordinates of red, green and blue can be calculated. This area can be compared with the area defined by NTSC. For example, when the area enclosed by the calculated color coordinates of the three primary colors is about 75% of the area defined by NTSC, it means that the color saturation is 75% of NTSC. According to the algorithm of the present invention, it can be stipulated that the light source of the white light emitting diode must meet 90% NTSC, 95% NTSC or 100% NTSC. Otherwise, it is necessary to go back to the third step (63) to readjust the concentration or ratio of the phosphor powder.

The fifth step (65) is to calculate the chromaticity coordinates of the white light composed of the chromaticity coordinates of red, green and blue after color separation. After the three primary colors are separated by the color filter, the color coordinates of the white light formed may deviate from the standard white light or the white light required by commercial specifications, so it is necessary to check whether the white light after color mixing can meet the requirements. Commercial specifications may require that the color coordinates of white light be at the color temperature radiated by a certain black body. For example, the color temperature of white light may be required to be 6500K or 6000K.

Together with the flow chart in FIG. 6 , the present invention also provides a block diagram for preparing a high color rendering white light emitting diode. Please refer to FIG. 7 , a black body radiation generator ( 71 ) of a target color temperature can provide a visible spectrum of black body radiation of a specific color temperature, wherein the color temperature ranges from 1500K to 8000K. A first database (72), used to store emission spectrums of various LED chips and phosphors. The emission range of the long-wave ultraviolet light-emitting diode chip is 365nm-380nm, the emission range of the purple-light light-emitting diode chip is 380nm-420nm, and the emission range of the blue-light light-emitting diode chip is 420nm-470nm. The emission wavelength range of phosphor powder can be between 480-580nm, and the composition can be silicate or oxide family, for example:

_CaSc2O4 :Ce ( _516nm );

(MgCaSrBa) ₂ SiO ₄ :Eu (525nm);

Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce (455-507nm);

(Ca _1.47 Mg _1.5 Ce _0.03 )(Sc _1.5 Y _0.5 )Si ₃ O ₁₂ (455nm);

(Ca _2.97 Ce _0.03 )Sc ₂ (Si, Ge) ₃ O ₁₂ .

And the emission wavelength range of the phosphor is between 600-650nm, mainly nitride and sulfide groups, for example:

CaAlSiN ₃ :Eu (650nm);

(CaEu)AlSiN ₃ (648nm);

(SrCa)AlSiN ₃ :Eu (630nm);

SrGa ₂ S ₄ :Eu (645nm).

Anyone skilled in the art should understand that other kinds of phosphors can be used in the present invention, such as garnet series, oxynitride and so on.

The spectrum calculation unit (73) obtains the emission spectrum of the light-emitting diode chip and two different phosphors from the first database (72), and first determines the concentration of the phosphors. Obtain a mixed light spectrum through the spectrum calculation unit (73). Please refer to Figure 8, which is the mixed light spectrum of LED chips mixed with two different phosphors. In FIG. 8 , curve A is the emission spectrum of the light-emitting diode chip, curves B and C are the emission spectrum of phosphor powder, and curve D is the mixed emission spectrum after mixing.

The spectrum comparison unit (74) compares the spectrum similarity between the visible light spectrum and the mixed light spectrum of the blackbody radiation of the target color temperature. If the mixed light spectrum reaches the spectral comparison similarity (Yes), then a suitable white light emission spectrum is obtained; if the mixed emission spectrum does not reach the spectral comparison similarity (No), it is necessary to adjust the concentration of the phosphor (76) or re-select Phosphor powder (77), until the spectrum ratio of the visible light spectrum of the blackbody radiation of the target color temperature and the mixed emission spectrum reaches similarity.

The present invention also provides a configuration block diagram of a high color rendering white light emitting diode, please refer to FIG. 10 . A black body radiation generator (100) of a target color temperature can provide a visible spectrum of black body radiation of a specific color temperature, wherein the range of the color temperature can be between 1500K-8000K. A first database (101), used to store emission spectra of various LED chips and phosphors. The emission range of the long-wave ultraviolet light-emitting diode chip is 365nm-380nm, the emission range of the purple-light light-emitting diode chip is 380nm-420nm, and the emission range of the blue-light light-emitting diode chip is 420nm-470nm. The emission wavelength range of phosphor powder can be between 480-580nm, and the composition can be silicate or oxide family, for example:

_CaSc2O4 :Ce ( _516nm );

(MgCaSrBa) ₂ SiO ₄ :Eu (525nm);

Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce (455-507nm);

(Ca _1.47 Mg _1.5 Ce _0.03 )(Sc _1.5 Y _0.5 )Si ₃ O ₁₂ (455nm);

(Ca _2.97 Ce _0.03 )Sc ₂ (Si, Ge) ₃ O ₁₂ .

And the emission wavelength range of the phosphor is between 600-650nm, mainly nitride and sulfide groups, for example:

CaAlSiN ₃ :Eu (650nm);

(CaEu)AlSiN ₃ (648nm);

(SrCa)AlSiN ₃ :Eu (630nm);

SrGa ₂ S ₄ :Eu (645nm).

Anyone skilled in the art should understand that other kinds of phosphors can be used in the present invention, such as garnet series, oxynitride and so on.

The spectrum calculation unit (102) obtains the emission spectra of the light-emitting diode chip and two different phosphors from the first database (101), and compares the black body radiation of the target color temperature from the black body radiation generator (100) of the target color temperature. Visible light spectrum to judge phosphor concentration. Obtain a mixed light spectrum through the spectrum calculation unit (102).

The second database (103) stores and provides filter spectra of color filters. Please refer to FIG. 9 , which shows a frequency spectrum of a color filter, in which the filtering spectrum of each color filter has a part of interlacing. Due to the interlacing of the filter spectrums of the filters of various colors, even for a light source of a white light-emitting diode with high color rendering, the color saturation will be reduced through such filter spectrums. This is because the blue light source will have a part of green light after passing through such a filter spectrum, which means that the original light source of each color light will have an impact on the final color. After the calculated mixed light spectrum is entered into the second database (103), it will be separated into three primary colors of red, green and blue. After the data of the three primary colors enter the color saturation calculation unit (104) and the color mixing calculation unit (105), the color saturation of the three primary colors after color separation and the color coordinates of white light composed of the three primary colors after color separation are calculated respectively.

After the calculation result enters the comparison unit (107), it will be judged whether the color coordinates of the white light composed of the color saturation and the three primary colors after color separation meet the requirements. When one of them is not satisfied, it can return to the first database (101) to reselect the phosphor or the spectrum calculation unit (102) to re-allocate the concentration of the phosphor, so that the color saturation calculation unit (104) and the color mixing calculation unit The results of (105) all meet the requirements. The condition of color saturation can be set as 90% NTSC, 95% NTSC or 100% NTSC. The white light after color mixing can require standard white light or white light required by commercial specifications. Among them, commercial specifications can require the color coordinates of white light to be at the color temperature of a certain black body radiation. For example, white light with a color temperature of 6500K can be required. Color coordinates or white light color coordinates of 6000K.

FIG. 11 shows a block diagram of a system configured with high color rendering white light emitting diodes of the present invention. A blackbody radiation spectrum generator (110) of a target color temperature can provide a blackbody radiation visible light spectrum of a specific color temperature, wherein the color temperature can range from 1500K to 8000K.

The first database (111) is used to store emission spectra of various LED chips and phosphors. The emission range of the long-wave ultraviolet light-emitting diode chip is 365nm-380nm, the emission range of the purple-light light-emitting diode chip is 380nm-420nm, and the emission range of the blue-light light-emitting diode chip is 420nm-470nm. The emission wavelength range of phosphor powder can be between 480-580nm, and the composition can be silicate or oxide family, for example:

_CaSc2O4 :Ce ( _516nm );

(MgCaSrBa) ₂ SiO ₄ :Eu (525nm);

Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce (455-507nm);

(Ca _1.47 Mg _1.5 Ce _0.03 )(Sc _1.5 Y _0.5 )Si ₃ O ₁₂ (455nm);

(Ca _2.97 Ce _0.03 )Sc ₂ (Si, Ge) ₃ O ₁₂ .

And the emission wavelength range of the phosphor is between 600-650nm, mainly nitride and sulfide groups, for example:

CaAlSiN ₃ :Eu (650nm);

(CaEu)AlSiN ₃ (648nm);

(SrCa)AlSiN ₃ :Eu (630nm);

SrGa ₂ S ₄ :Eu (645nm).

Anyone skilled in the art should understand that other kinds of phosphors can be used in the present invention, such as garnet series, oxynitride and so on.

The spectrum calculation unit (112) obtains the emission spectrum of the LED chip and two different phosphors from the first database (111), and first determines the concentration of the phosphors. Obtain a mixed light spectrum through the spectrum calculation unit (112).

The spectrum comparison unit (113) compares the spectrum similarity between the visible light spectrum and the mixed light spectrum of the blackbody radiation of the target color temperature. The result of the comparison is a first order approximation (114). When the result of the first-order approximation is acceptable (Yes), proceed to the next stage. When the result of the first-order approximation is not possible (No), then return to the spectrum calculation unit (112), and find out the concentration of other phosphors again, until the result of the first-order approximation (114) is acceptable (Yes) until.

A second database (116) stores and provides filter spectra of color filters. When the calculated mixed light spectrum enters the color separation unit (115), it will be separated into three primary colors of red, green and blue. After the data of the three primary colors enter the color saturation calculation unit (117) and the three primary color mixing calculation unit (118), respectively calculate the color saturation of the three primary colors after color separation and the color coordinates of the white light formed by the three primary colors after color separation .

After the calculation result enters the comparison unit (119), it will judge whether the color coordinates of the white light composed of the color saturation and the three primary colors after color separation meet the requirements. When one of them is not satisfied, it will return to the spectrum calculation unit (112) to re-adjust the concentration of phosphor, so that the results of the color saturation calculation unit (117) and the three primary color mixing calculation unit (118) all meet the requirements. The condition of color saturation can be set as 90% NTSC, 95% NTSC or 100% NTSC. The white light after color mixing can require standard white light or white light required by commercial specifications. Among them, commercial specifications can require the color coordinates of white light to be at the color temperature of a certain black body radiation. For example, white light with a color temperature of 6500K can be required. Color coordinates or white light color coordinates of 6000K.

FIG. 12 shows a schematic diagram of CIE1931 chromaticity coordinates of the high color saturation LED backlight module of the present invention, NTSC standard, and a general backlight. When using the method or system of the present invention, the color saturation can be improved compared with the general white light-emitting diode light source. In FIG. 12 , the three primary colors using the method of the present invention are marked by triangles, wherein the color saturation can be represented by the area of the triangle enclosed by the triangles. Compared with the area of the triangle surrounded by ○, it is closer to the area of the triangle surrounded by squares. This means that the present invention can have better color saturation.

In addition to mixing two phosphor powders as described in the above embodiments, the present invention can also increase the number of phosphor powders mixed to three, so that the present invention can better meet the needs of practical applications. Of course, the actual application is not limited to the above-mentioned two or three types of phosphors, and more than three types of phosphors can be used to meet the needs of users if necessary.

It can be seen from the above embodiments that the means of the present invention is to use the Planck equation to calculate the spectrum of black body radiation at a set temperature, and use this spectrum to calculate the first approximate concentration of various phosphors. According to the first approximate concentration of each phosphor powder, the emission spectrum of the light-emitting diode after color mixing is calculated, and the color saturation after the color filter and the color coordinates of the mixed light into white light are calculated based on the emission spectrum, so as to correct the phosphor powder concentration, or choose other phosphors.

Utilizing the means of the present invention can achieve the effect of quickly deploying the LED backlight module with high color saturation, and can greatly reduce the time cost of trial and error.

From the means and effects of the present invention, it can be obtained that the present invention has many advantages. First, it is not necessary to find out the mixing ratio of the phosphor powder by trial and error. At the same time, when there are many types of phosphors available for deployment, the development time can be greatly reduced.

Obviously, according to the description in the above embodiments, the present invention may have many modifications and differences. It is therefore to be understood, within the scope of the appended claims, that the invention may be practiced broadly in other embodiments than the foregoing detailed description. The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention; all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the following within the scope of the claims.

Claims (9)

1. A method for configuring a light-emitting diode backlight module with high color saturation, comprising: Calculate a standard spectrum; providing emission spectra of a light emitting diode, a first phosphor and a second phosphor; Adjusting the concentration of the first phosphor and the second phosphor, when the first phosphor and the second phosphor are mixed with the light-emitting diode, a first mixed light spectrum is obtained, so that the first mixed light spectrum is consistent with the standard Spectrum close; The first mixed light spectrum is separated into the color coordinates of the three primary colors by a color filter, the area formed by the color coordinates of the three primary colors is calculated, and the color coordinate position of the white light composed of the three primary colors is calculated; Judging whether the color saturation and the color coordinates of the white light composed of the three primary colors after color separation meet the requirements, if any of the above color saturation and the color coordinates of the white light do not meet the requirements, then readjust the first phosphor and the second phosphor. Concentration, if the above color saturation and color coordinates of white light meet the requirements, the configuration is completed. 2. A method of configuring a light-emitting diode backlight module with high color saturation, comprising: calculating a black body luminescence spectrum at a first color temperature; adjusting the concentration of multiple phosphors so that the spectrum mixed with a light-emitting diode is close to the black body radiation spectrum; The mixed light spectrum is separated into red, green and blue chromaticity coordinates after passing through a color filter; Calculating the area formed by the chromaticity coordinates of the red, green and blue and the chromaticity coordinate position of the white light synthesized by the red, green and blue; Judging whether the color saturation of the color saturation and the color coordinates of the white light composed of the three primary colors after color separation meet the requirements, if any of the above color saturation and the color coordinates of the white light do not meet the requirements, then readjust the concentration of the multiple phosphors, if the above If both the color saturation and the color coordinates of white light meet the requirements, the configuration is completed. 3. A method of configuring a light-emitting diode backlight module with high color saturation, comprising: Using Planck's equation to calculate the black body radiation luminescence spectrum at a first color temperature; providing emission spectra of a light emitting diode, a first phosphor and a second phosphor; Adjusting the concentration of the first phosphor and the second phosphor, when the first phosphor and the second phosphor are mixed with the light-emitting diode, a first mixed light spectrum is obtained, so that the first mixed light spectrum is consistent with the light-emitting diode The spectrum of black body radiation emission is close to; The first mixed light spectrum is separated into red, green and blue chromaticity coordinates after being passed through a color filter; calculating the area formed by the chromaticity coordinates of the red, green and blue and calculating the color coordinate position of the white light composed of the red, green and blue; Judging whether the color saturation and the color coordinates of the white light composed of red, green and blue after color separation meet the requirements, if any of the above color saturation and the color coordinates of the white light do not meet the requirements, then readjust the first phosphor and The concentration of the second phosphor, if the above-mentioned color saturation and color coordinates of white light meet the requirements, then the configuration is completed. 4. according to the method for the LED backlight module described in any one of claim 1 and 3 configurations with high color saturation, wherein above-mentioned first fluorescent powder is CaSc2O4:Ce, (MgCaSrBa)2SiO4:Eu, Ca3Sc2Si3O12: Ce, (Ca1.47Mg1.5Ce0.03) (Sc1.5Y0.5) Si3O12 or (Ca2.97Ce0.03) Sc2(Si, Ge)3O12. 5. The method for configuring an LED backlight module with high color saturation according to claim 4, wherein the above-mentioned second phosphor is CaAlSiN ₃ :Eu, (CaEu)AlSiN ₃ , (SrCa)AlSiN ₃ :Eu or SrGa ₂ S ₄ :Eu. 6. A system configured with a light-emitting diode backlight module with high color saturation, comprising: a spectrum generator, configured to generate a black body radiation luminescence spectrum at a first color temperature; The first color mixing unit is used to adjust the concentration of multiple phosphors so that the spectrum after mixing with a light emitting diode is close to the black body radiation spectrum; The filter unit calculates the red, green and blue color coordinates of the mixed light spectrum by means of a filter spectrum; a color saturation calculation unit for calculating the area formed by the chromaticity coordinates of the red, green and blue; and The second color mixing unit is used to calculate the color coordinates of the white light after the red, green and blue color mixing, The color saturation calculation unit and the second color mixing unit can also judge whether the color saturation and the color coordinates of the white light composed of red, green and blue after color separation meet the requirements, if the above color saturation and the color coordinates of the white light If any one fails to meet the requirements, the concentration of the multiple phosphors is re-adjusted, and if the above-mentioned color saturation and color coordinates of the white light all meet the requirements, the configuration is completed. 7. A system configured with a light-emitting diode backlight module with high color saturation, comprising: A first database for providing a light emitting diode spectrum, a first phosphor light spectrum, and a second phosphor light spectrum; A standard color temperature spectrum generator, used to generate the visible light spectrum emitted by black body radiation at a first color temperature, namely the standard spectrum; a first color mixing unit, used to calculate the light mixing spectrum of the light emitting diode, the first phosphor and the second phosphor in the first database, wherein the light mixing spectrum is a first light mixing spectrum; A spectrum comparison unit, used to compare the first mixed light spectrum with the standard spectrum generated by the standard color temperature spectrum generator; A second database for storing a filter spectrum of a color filter; A filter unit, which calculates the color coordinates of the three primary colors of the first light mixing spectrum with the help of the filter spectrum of the second database; A color saturation calculation unit, used to calculate the area formed by the color coordinates of the three primary colors; and A second color mixing unit, used to calculate the color coordinates of the white light after the three primary colors are mixed; The color saturation calculation unit and the second color mixing unit can also judge whether the color coordinates of the white light composed of the color saturation and the three primary colors after color separation meet the requirements, if any one of the above color saturation and the color coordinates of the white light does not meet the requirements , then readjust the concentration of the first phosphor and the second phosphor, and if the color saturation and the color coordinates of the white light meet the requirements, the configuration is completed. 8. The system for configuring LED backlight modules with high color saturation according to claim 7, wherein the above-mentioned first phosphor is CaSc ₂ O ₄ :Ce, (MgCaSrBa) ₂ SiO ₄ :Eu, Ca ₃ Sc ₂ Si ₃ O1 ₂ : Ce, (Ca ₁₄₇ Mg _1.5 Ce _0.03 )(Sc _1.5 Y _0.5 )Si ₃ O1 ₂ or (Ca _2.97 Ce _0.03 )Sc ₂ (Si, Ge) ₃ O ₁₂ . 9. The system for configuring LED backlight modules with high color saturation according to claim 8, wherein the above-mentioned second phosphor is CaAlSiN ₃ :Eu, (CaEu)AlSiN ₃ , (SrCa)AlSiN ₃ :Eu or SrGa ₂ S ₄ :Eu.

Images