CN101725843A - System and method for configuring LED backlight module with high color saturation - Google Patents
System and method for configuring LED backlight module with high color saturation Download PDFInfo
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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
Technical field
The present invention relates to a kind of light-emitting diode (LED) backlight module, relate in particular to a kind of configuration-system and method with light-emitting diode (LED) backlight module of high color saturation.
Background technology
Light emitting diode (Light Emitting Diode; Be called for short LED), be a kind ofly electric energy can be converted into the electronic component of luminous energy, and possess the characteristic of diode simultaneously.When generally giving direct current, light emitting diode can be stably luminous, if but connect alternating current, light emitting diode can present the form of flicker, and the frequency of flicker is decided according to the frequency of input AC electricity.The principle of luminosity of light emitting diode is an applied voltage, makes electronics with after the hole combines in semiconductor, and the form of energy with light discharged.
The composition of light-emitting diode chip for backlight unit mainly comprises the semiconducting compound of three races's arsenide, three races's phosphide, III-nitride or II-VI family etc. at present.Be accompanied by the difference of light-emitting diode chip for backlight unit manufactured materials, the energy that the photon that generates has is also different, therefore controls the luminous wavelength in light-emitting diodes section of jurisdiction by manufactured materials, and then produces the various light-emitting diode chip for backlight unit of different spectrum and color.Present global industry development go out different types of light-emitting diode chip for backlight unit can launch from the infrared ray to the blue light between the light of different wave length, and purple is to the technology of ultraviolet light-emitting diode chip for backlight unit also in the maturation.The main emphasis of above-mentioned light emitting diode is at monochromatic light, or the light emitting diode of single-frequency.The luminous frequency spectrum of white light emitting diode no longer is to concentrate on a certain monochromatic light, but a distribution is arranged in the frequency spectrum of visible light.How chip-shaped the combination that is used for forming white light emitting diode at present mainly be divided into and two types on single-chip type.
Multicore sheet type is mixed this three kinds of light by lens, and then is produced our being seen white light with the light-emitting diode chip for backlight unit of red, green and blue three looks.Its advantage is a high luminous efficiency and photochromic adjustable, and shortcoming is three kinds of chips of palpus, and each chip chamber has the rate of decay and the life-span of individual circuits design and three kinds of chips to be not quite similar, and is difficult to control the life-span of white light emitting diode.
In addition, produce white light with the single-chip type and then can be divided into three kinds of modes.First kind of mode also is the mode of main flow, with blue led chips irradiation yellow fluorescent powder, fluorescent material excited and sends white light.Such product when adjusting the CIE value of light emitting diode, only need choosing to the wavelength of blue light-emitting diode and yellow fluorescent powder excite frequency spectrum after, need only the luminous intensity of adjustment blue light-emitting diode and the concentration of yellow fluorescent powder.Such spectrum that white light emitting diode produced, the luminosity of red area are too weak and cause on average drilling colour system number (General Color Rendering Index; Ra) value is on the low side.For example, when this product was applied in backlight, the pattern that then shows did not often have redness.Therefore, present high color rendering white light emitting diode becomes the direction of present stage all circles' pursuit.
In order to remedy the luminosity of red area, follow-up derive with blue led chips irradiation green and red fluorescence powder or produce white light with blue led chips irradiation green and yellow fluorescent powder improve that on average to drill the colour system number be the second way.The third mode then produces white light with green, the red and blue three kinds of fluorescent material of ultraviolet light-emitting diodes chip irradiation.
In above-mentioned mode, the production method of wanting to reach the high color saturation light-emitting diode (LED) backlight module can be the fluorescent material that increases redness or uses two or more fluorescent material etc.Yet when using two kinds of fluorescent material mixed lights to produce the light source of specific CIE value by light emitting diode, always having three kinds of parameters need adjust simultaneously, just the concentration of the luminous intensity of light emitting diode and two fluorescent material.Use the color saturation of light emitting diode as backlight in order to promote, the mode that need carry out trial and error (trial-and-error) repeatedly goes to adjust the concentration ratio between the different fluorescent material and the luminous intensity of blue light-emitting diode.
In addition, the luminous frequency spectrum of light emitting diode can be relevant with temperature.When so-called junction temperature (junctiontemperature) more height, the peak wavelength of the luminous frequency spectrum of light emitting diode also can and then drift about to the long wavelength.Along with the operating time increase of light emitting diode, the temperature of element also can and then increase.Therefore under operating for a long time, the glow frequency of light emitting diode also can change.In addition, the manufacturing process of light emitting diode has the distribution of frequency spectrum thereby can carry out branch section (bin) to light emitting diode, and this can significantly increase the manufacturing cost of light emitting diode.
United States Patent (USP) notification number US2006/0290624 mainly is to solve at this problem.The mode of this technology is to carry out the school at trichromatic one of them color earlier to transfer, and for example at green, provides two light emitting diodes to I haven't seen you for ages, and one of them light emitting diode wavelength ratio green glow is high a little, and another light emitting diode wavelength ratio green glow is low a little.Use control circuit to make to obtain behind two light emitting diode mixed lights the wavelength of needed correct green glow then.After the time of operation increases, the luminous frequency spectrum of two light emitting diodes might change, if sensor at this moment detects the change that excites frequency spectrum, then the luminous intensity that can control two light emitting diodes by control circuit makes final mixed light frequency spectrum still remain unchanged.Can adjust when trichromatic one of them color, then trichromatic light emitting diode can be adjusted respectively.
Whole technique is feasible in theory, but can significantly increase cost of manufacture in commercial such design.At first be just to need three control circuits and three sensors at three primary colors.In addition, the light emitting diode of each color can need at least two kinds of light emitting diodes.Trichromatic light emitting diode carries out the school with regard to six kinds of light emitting diodes of needs to be transferred, and this also can significantly increase the manufacturing and the management costs of light emitting diode.Moreover the life-span of each light emitting diode, problem inequality also can increase the problem of product on the life-span once more.
Another mode is to use light emitting diode to come excitated fluorescent powder luminous.Fluorescent material has following advantage for using trichromatic light emitting diode.When the luminous frequency spectrum of light emitting diode changes, the just change of absorption spectrum for fluorescent material.As long as the excitation spectrum of light emitting diode still drops on the absorption spectrum of fluorescent material, then the excitation spectrum of fluorescent material just can not change.As if, use fluorescent material is good selection.
In Taiwan patent announcement numbers 200627678, mentioned and used ultraviolet light or the light emitting diode of purple light excites three primary colors fluorescent material.Such mode can significantly increase the color rendering of LED source and during as backlight liquid crystal display, and the colourity of preferable NTSC can be provided.
Taiwan notification number 200830508 proposes to use the fluorescent material of ruddiness to increase NTSC, and the red fluorescence powder that uses is CaAlSiN
3: Eu, green emitting phosphor (Ba
xSr
1-x)
2SiO
4: Eu (x 〉=0.5).
Above-mentioned mode all has mentions the NTSC that uses multiple fluorescent material to promote light emitting diode.Yet, have some problem to need to solve.The first, mostly the allotment ratio of fluorescent material is to adopt the mode of trial and error, and this can increase many research and development time; The second, the optical filtering spectrum of the color filter that each is tame is also inequality, for the manufacturer of light emitting diode, needs the allotment ratio of different fluorescent material just can promote color saturation, and this can increase the time of more trial and error.
When the fluorescent material kind that develops on the market is more and more many, or wish to use two or more fluorescent material to carry out mixed light, allocate different types of fluorescent material and to reach development time of high color saturation light-emitting diode (LED) backlight module also more and more long.For the listing of product, be undoubtedly sizable challenge.
Summary of the invention
A purpose of the present invention is to utilize the calculating of software can mix the method and system that the multiple fluorescent material of use blendes together the high color saturation light-emitting diode (LED) backlight module fast, to reduce the time cost of trial and error.
In above-mentioned background of invention, in order to meet the demand of industry interests, the invention provides a kind of method that disposes the high color saturation light-emitting diode (LED) backlight module, its step comprises calculates a standard frequency spectrum, wherein the visible light transmitted by black-body radiation frequency spectrum of standard frequency spectrum under one first colour temperature earlier.Afterwards, provide the emission spectrum of a light emitting diode, the emission spectrum of one first fluorescent material and the emission spectrum of one second fluorescent material.Adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum by above-mentioned standard frequency spectrum, make win mixed light frequency spectrum and standard frequency spectrum approaching.Then, the first mixed light frequency spectrum is become trichromatic chromaticity coordinates by a color filter color separation, and calculate the area that trichromatic chromaticity coordinates is formed, and the chromaticity coordinates position of calculating the white light of forming by three primary colors.
The present invention also provides a kind of method that disposes the high color saturation light-emitting diode (LED) backlight module, and its step comprises calculates a standard frequency spectrum earlier, and the visible light transmitted by black-body radiation frequency spectrum of standard frequency spectrum under one first colour temperature.Afterwards, provide the emission spectrum of a light emitting diode, the emission spectrum of one first fluorescent material and the emission spectrum of one second fluorescent material.Adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum by standard frequency spectrum.Frequency spectrum behind the mixed light becomes red, green with blue chromaticity coordinate by color separation behind the color filter, afterwards, calculates red, the green area of forming with blue chromaticity coordinate, and synthesizes redness, and green is with the chromaticity coordinate position of the white light of blueness.
The present invention also provides a kind of system that disposes the high color saturation light-emitting diode (LED) backlight module, comprises one first database, a standard frequency spectrum generator, one first colour mixture unit, one second colour mixture unit, a frequency spectrum comparing unit, one second database, a filter element and a color saturation computation unit.The first above-mentioned database is in order to provide a lumination of light emitting diode frequency spectrum, one first light-emitting phosphor frequency spectrum and one second light-emitting phosphor frequency spectrum.The visible light transmitted by black-body radiation frequency spectrum of above-mentioned standard frequency spectrum generator for generating under one first colour temperature.The first above-mentioned colour mixture unit is in order to calculate the mixed light frequency spectrum of light emitting diode, first fluorescent material and second fluorescent material in first database, and wherein the mixed light frequency spectrum is one first mixed light frequency spectrum.Above-mentioned frequency spectrum comparing unit is in order to compare the standard frequency spectrum that the first mixed light frequency spectrum and standard color temperature frequency spectrum generator are produced.The second above-mentioned database is in order to store the optical filtering frequency spectrum of a color filter.Above-mentioned filter element calculates the trichromatic chromaticity coordinates of the first mixed light frequency spectrum by the optical filtering frequency spectrum of second database.Above-mentioned color saturation computing unit is in order to calculate the area that trichromatic chromaticity coordinates is formed.The second above-mentioned colour mixture unit is in order to calculate the chromaticity coordinates of the white light after the three primary colors colour mixture.
The present invention also provides a kind of multi-fluorescence powder concentration of calculating to obtain the method for high color saturation light-emitting diode (LED) backlight module, comprise the concentration of adjusting the multi-fluorescence powder make with a light emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature, and after becoming three primary colors via the frequency spectrum color separation of a color filter after, make area and white color coordinate that trichromatic chromaticity coordinate is formed to meet the demands with mixed light.
The present invention also provides a kind of two stage approximate method of various fluorescent material in the allotment ratio of high color saturation light-emitting diode (LED) backlight module of finding out of using, comprise the mixed proportion that mixes near the various fluorescent material of black body radiation, and the allotment ratio of the described various fluorescent material of chromaticity coordinates correction of the composition area of the chromaticity coordinates from the three primary colors that a color filter color separation goes out and white light.
Step, means or the system of wherein above-mentioned this standard frequency spectrum of calculating are to utilize Planck (Planck) equation to calculate and get.The first above-mentioned mixed light frequency spectrum is by light emitting diode, and first fluorescent material and obtains after the second fluorescent material exciting radiation.The first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3O1
2: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3O1
2Or (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12The second wherein above-mentioned fluorescent material can be CaAlSiN
3: Eu, (CaEu) AlSiN
3, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.The present invention can comprise one the 3rd fluorescent material and emission spectrum thereof.
Utilize means of the present invention, can reach the effect that can mix the light-emitting diode (LED) backlight module of high color saturation fast, and can significantly reduce the time cost of trial and error.
Description of drawings
Fig. 1 shows the schematic diagram of CIE 1931 colourities;
Fig. 2 shows NTSC standard and general CIE 1931 chromaticity coordinate schematic diagrames backlight;
Fig. 3 shows that a kind of multi-fluorescence powder concentration of calculating of the present invention is to obtain the method flow diagram of high color saturation light-emitting diode (LED) backlight module;
Fig. 4 shows a kind of method flow diagram that disposes the high color saturation light-emitting diode (LED) backlight module of the present invention;
Fig. 5 shows a kind of system block diagram that disposes the high color saturation light-emitting diode (LED) backlight module of the present invention;
Fig. 6 shows the compound method flow chart of high color rendering white light emitting diode of the present invention;
Fig. 7 shows the compounding system block diagram of emission spectrum similarity of the present invention high color rendering white light emitting diode relatively;
Fig. 8 shows the schematic diagram of the mixing emission spectrum of light-emitting diode chip for backlight unit and two kinds of different fluorescent material concentration;
The optical filtering spectrogram of Fig. 9 display color filter;
Figure 10 shows the compounding system block diagram of the high color rendering white light emitting diode of drilling the comparison of colour system number; And
Figure 11 shows the system block diagram of configuration high color rendering white light emitting diode of the present invention; And
Figure 12 shows high color saturation light-emitting diode (LED) backlight module of the present invention, and the NTSC standard is with general CIE 1931 chromaticity coordinate schematic diagrames backlight.
Wherein, description of reference numerals is as follows:
0 finishes the 31-32 step
41-45 step 51 first database
52 first colour mixture unit, 53 standard color temperature frequency spectrum generators
54 frequency spectrum comparing units, 55 second databases
56 filter elements, 57 color saturation computing units
58 second colour mixture unit 61-65 steps
Black body radiation generator 72 first databases of 71 target colour temperatures
73 frequency spectrum computing units, 74 frequency spectrum comparing units
76 concentration 77 of adjusting fluorescent material are reselected fluorescent material
The black body radiation of 100 target colour temperatures produces 101 first database devices
102 frequency spectrum computing units, 103 second databases
104 color saturation computing units, 105 colour mixture computing units
106 comparing units 108 are adjusted the concentration of fluorescent material
109 reselect fluorescent material
The frequency spectrum generator of the black body radiation of 110 target colour temperatures
111 first databases, 112 frequency spectrum computing units
113 frequency spectrum comparing units, 114 first rank are approximate
115 fens color element 116 second databases
117 three primary colors chromaticity coordinate computing units, 118 three primary colors mixed light unit
119 second rank are approximate
The specific embodiment
The method and system that the present invention is a kind of high color saturation light-emitting diode (LED) backlight module in this direction of inquiring into.In order to understand the present invention up hill and dale, detailed step and composition thereof will be proposed in following description.Apparently, execution of the present invention is not defined in the specific details that the those of ordinary skill of the method and system of high color saturation light-emitting diode (LED) backlight module is had the knack of.On the other hand, well-known composition or step are not described in the details, with the restriction of avoiding causing the present invention unnecessary.The preferred embodiments of the present invention can be described in detail as follows, yet except these were described in detail, the present invention can also be implemented among other the embodiment widely, and scope of the present invention do not limited, its with after claim be as the criterion.
From the above, the important element that produces white light wherein one be fluorescent material.And the luminous fluorophor that is of fluorescent material can allow the electronics of fluorophor obtain enough energy through after the exciting of different excitaton sources such as light, electric field, electron beam, and the excitation state of can step being adjourned to higher-energy by ground state can rank.Because the electronics that is in high energy rank excitation state is unstable, the ground state that can get back to the low energy rank in the mode of alleviating (relaxation) again.In the alleviation process,,, make the form consumption of energy with " heat " with producing the vibration of lattice if release energy in non-radiative (non-radiative) mode.If discharge, then emit energy with the form of light in electromagnetic radiation (radiative) mode.If the optical wavelength of sending drops on visible-range, then human eye can be seen the light that fluorophor radiates.At this fluorophor issued light, only relevant with electronics transition between high low energy rank.
(host lattice H) is main constituent, for example ZnS:Cu to the employed fluorescent material of light emitting diode by host lattice
2+, wherein ZnS is host lattice.The centre of luminescence constitutes in host lattice by a small amount of interpolation or doping (dope) xenogenesis ion in the fluorophor, for example ZnS:Cu
2+In Cu
2+The xenogenesis ion is also referred to as active centre (activator) or activator for being excited and producing the centerbody of fluorescence thus.Sometimes also can in host lattice, add second kind of xenogenesis ion in the fluorescent material, act as the excitation energy that it is absorbed and be passed to active centre ion and luminous, be called sensitizer (sensitizer) or coactivator (co-activator).So can design the fluorescent material that tool of all kinds is launched various wavelength by controlling host lattice and active centre.At present, the material of main part of the fluorescent material that can see on the market is many is made of sulfide (Sulfides), oxide (Oxides), oxysulfide (Oxysulfides), nitride (Nitrides), nitrogen oxide (Oxynitrides), garnet (Garnet) and silicate (Silicates) class etc.
The white light of common people's indication is meant the sunshine of seeing daytime, goes up the analysis back through scientific principle and finds that its white light comprises the continuous spectrum of 400nm～700nm scope.With visual color, can resolve into seven looks such as red, orange, yellow, green, blue, indigo, purple.According to the principle of luminosity of light emitting diode, generally can only send monochromatic light.In order to allow it can send white light, technically must mix the light of two or more complementary colours and reach the purpose of white light.White light emitting diode is except producing white light, and the ability that whether can represent the informativeness of object color promptly is called the part that color rendering (Color Rendering) also is technical necessary consideration.The light source that color rendering is high is comparatively true to nature for the performance of object color, and illuminated thing is at the also relatively more approaching natural primary colors of the mankind's the object color that eyes presented.White light emitting diode drill colour system number (Color Rendering Index; CRI) relevant with light-emitting diode chip for backlight unit, fluorescent material and material.Under different-colour, the fluorescent material of use or light-emitting diode chip for backlight unit can be different.
The definition of colour temperature (Color Temperature) is according to black matrix (Black body) radiation, when being heated to uniform temperature, can present coloured visible light to metal (near black matrix).This light changes along with the rising of temperature, and the temperature that influences this light source just is the colour temperature of this light source.For example when an iron was heated up, iron can become aglow at first, can become orange afterwards, was yellow afterwards, was blue and white afterwards again.The researcher utilizes a row continuous spectrum to verify relation between its temperature and the color.If the x axle is a wavelength, the y axle is just represented radiant flux, when the y axle is the amount of reflection different wave length radiation, and the curve of energy that iron the is emitted during different temperatures of can drawing.So, when iron becomes redness, do not represent that it only glows, just the ruddiness of its radiation is more than the ripple of other wavelength.Three speciality are found in test thus: 1. curve has a high peak dot; 2. when increase in temperature, high peak dot can move to the shortwave direction; 3. when increase in temperature, the radiant flux of all wavelengths all can increase.For example iron is maximum at 4200K granting ruddiness, and the high peak dot of radiant flux takes on a red color so we see iron at the ruddiness place, and when 4800K, the high peak dot of radiant flux is orange-yellow.Being orange-yellow so we see iron, is because when increase in temperature, high peak dot can move to the shortwave direction, so when 5800K, high peak dot can move on to yellow green.
In the calculating of colour temperature, be to be unit with absolute temperature Kelvin (K), black-body radiation with Kelvin=Celsius+273 as the starting points of calculating.Suppose a certain black object, can be with all heat absorption that fall thereon, and not loss can all discharge the energy that heat generates again simultaneously with the form of " light ", it just can become different colors because of the height that is subjected to heating power.For example, when the heating power that is subjected to when black matrix is equivalent to 500-550 ℃, will become kermesinus, when reaching 1050-1150 ℃, with regard to yellowing.Therefore, the color component of light source is corresponding with the suffered heating power temperature of this black matrix.Only colour temperature is to represent with Kelvin (K) colour temperature unit, rather than uses centigrade thermic unit unit.It just became white when the heating power that is subjected to when black matrix made it can emit whole visible light wave in the spectrum, and the tungsten filament in our the used bulb is just quite near this black matrix.The colour temperature meter algorithm is exactly according to above-mentioned principle, with the K look K temperature unit of light that tungsten filament is radiated represent the to be heated colour temperature of light that tungsten filament is radiated of representing to be heated.According to this principle, the colour temperature of any light is suffered " temperature " when being equivalent to above-mentioned black matrix and giving out same color.This temperature can find its corresponding points on the Planckian locus of chromatic diagram, the curve of black matrix only can be subjected to temperature and change, and can not be subjected to the composition of other factors such as black matrix and changes, so no matter be the black matrix of any composition, so long as same temperature all can have same curve.
Owing to condition influence such as lamp, look, time, weather, direction of observation, season and geographical position alter a great deal, evaluation to color is extremely inconvenient, so International Commission on Illumination's (CommissionInternational de l ' Eclairage is called for short CIE).Stipulate various very near the standard sources of natural daylight in nineteen thirty.
In addition, International Commission on Illumination has formulated one and has been called the standard of " 1931 CIE standard observer " according to the Mathematical Modeling of vision and color-match experimental result, be actually a cover color matching functions of representing with three curves, therefore be also referred to as " CIE 1931 matches criteria functions " in many documents, as shown in Figure 1.CIE 1931 chromatic diagrams are XYZ chromaticity diagrams of representing with nominal value, and x represents red component, and y represents green component.Be all colours of visible spectrum in the shape of a hoof scope in chromatic diagram (chromaticity diagram), shape of a hoof edge then is saturated monochromatic wavelength.(x, y z) indicate and can be combined into certain relative scale of the same colour (x and y coordinate are only arranged on the figure, can derive z by identity x+y+z=1) by three primary colors with photochromic coordinate in this system.Middle white light, its coordinate is (0.33,0.33).The color that is looped around the color space edge is a spectrum colour, and the maximum saturation of spectrum colour is represented on the border, and the wavelength of borderline numeral spectrum colour, its profile comprise all perception tones.All monochromatic light all are positioned on the ligulate curve, and this curve is exactly monochromatic track, and the numeral of the other mark of curve is monochromatic (or claiming spectrum colour) light wavelength value.The various actual colors of occurring in nature all are positioned at this closed curve.
NTSC is the colourcast standard of being formulated by National Television System Committee's (National TelevisionSystem Committee is abbreviated as NTSC) December nineteen fifty-two.NTSC belongs to system simultaneously, and frame frequency is per second 29.97fps, and scan line is 525, lines by line scan, and aspect ratio is 4: 3, and resolution is 720 * 480.The modulation of the carrier chrominance signal of this standard has comprised two kinds of balance modulation and orthogonal modulation, has solved color/monochrome television broadcasting compatibling problem.
In Fig. 2, show NTSC standard and general CIE 1931 chromaticity coordinate schematic diagrames backlight.The defined color of NTSC can be with trichromatic three cartographic represenation of area that coordinate was surrounded in CIE as can be seen in Fig. 2.In Fig. 2, be the area that is surrounded by three square points.At present general with white light emitting diode as Backlight For Liquid Crystal Display Panels, the color saturation that can provide in Fig. 2, is less compared to the standard area of NTSC.Therefore the color saturation that can provide is relatively poor.
The calculating of black body radiation is to be directly proportional E=aT in 1879 by the gross energy (E) of J.Stefan proposition black body radiation and the biquadratic of absolute temperature (T)
4, promptly so-called Si Difen-Boltzmann law (Stefan-Boltzmann law).
Wien also further calculated the radiant energy wavelength change in 1893, found that the variation of wavelength X is directly proportional with temperature, if draw Stefan-Boltzmann law again, and adiabatic process formula in the thermodynamics, can get Wien displacement law, T λ
Max=constant.
Wien in 1896 considers and analyzes experimental data to draw a semiempirical formula and be from the thermodynamics universal theory
ρ
v＝αv
3exp(βv/T)
ρ wherein
vBe radiant energy dfensity (radiant energy density) that v is a frequency, T is an absolute temperature, and α and β are constants.
1900, J.W.Rayleigh, J.H.Jeans derived a black body radiation formula, i.e. Rayleigh-Jeans law according to classic electrodynamics and Statistical Physics theory:
Wherein c is the light velocity, k=Boltzmann ' s constant.But this formula sincerely meets in low frequency part and empirical curve, and when v → ∞, ρ
v→ ∞ disperses, and obviously is not inconsistent " the ultraviolet disaster " in the promptly classic physics with experiment.
Meticulousr afterwards and comprehensive experiment shows that the Wien formula is not all to meet fine with all experimental datas.In long-wave band, Wien formula and experiment have significantly and depart from.Roentgen Planck (M.Planck) will find a formula that can coincide with experimental data in the end of the year 1900, promptly
Or
Wherein h is a Planck's constant, and size is h=6.626 * 10-34Js.By the hypothesis of the Planck Rayleigh-Jeans law that can successfully explain and derive, Wien displacement law, Stefan-Boltzmann law.
Because different colour temperature, factor such as light-emitting diode chip for backlight unit and fluorescent material all influences the color rendering of white-light emitting spectrum, in process of the test, often need repeatedly each influence factor of cross-beta, obtain the real cost plenty of time and the cost of needing of white light emitting diode of a high color rendering.The aforesaid problem of the artificial solution of invention, reach the white light emitting diode of high color rendering in the high efficiency mode, according to the principle of above-mentioned black body radiation and further create and invent a kind of can mixing fast by its Planck equation formula of deriving (Planck ' s law) and use multiple fluorescent material to be mixed into the compound method and the system of the white light emitting diode of high color rendering.
Means of the present invention are to use the two stage approximate allotment ratio of various fluorescent material at the high color saturation light-emitting diode (LED) backlight module of finding out.The approximate of phase I mainly is the mixed proportion that mixes near the various fluorescent material of black body radiation, and the approximate of second stage mainly is the chromaticity coordinates position of judging color saturation and white light after the color separation of color filter.
Seeing also Fig. 3, is to show that a kind of multi-fluorescence powder concentration of calculating of the present invention is to obtain the method for high color saturation light-emitting diode (LED) backlight module.First step (31), the concentration of at first adjusting the multi-fluorescence powder make with a light emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature.Above-mentioned light emitting diode can be a ultraviolet light-emitting diodes, purple-light LED, or blue light-emitting diode.The multi-fluorescence powder can have two kinds or two or more fluorescent material, is made decision by the coloured light of light emitting diode.For example, when using ultraviolet light or purple-light LED, need to use simultaneously the fluorescent material of three looks just can blend together white light at least.When using blue light-emitting diode, need select the fluorescent material of two kinds of colors just can blend together the white light of high color rendering at least.Afterwards, second step (32) is found out frequency spectrum behind the mixed light and is divided into trichromatic chromaticity coordinates after by color filter, checks the area that trichromatic chromaticity coordinates forms and the chromaticity coordinates position of three primary colors institute synthesize white light.
In the flow process with reference to figure 3, the present invention also provides a kind of method that disposes the high color saturation light-emitting diode (LED) backlight module, and detailed process sees also Fig. 4.At first, first step (41) calculates a standard frequency spectrum, wherein the visible light transmitted by black-body radiation frequency spectrum of standard frequency spectrum under one first colour temperature.Simultaneously, in second step (42), provide the emission spectrum of a light emitting diode, the emission spectrum of one first fluorescent material and the emission spectrum of one second fluorescent material.Afterwards, in third step (43), adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum, make win mixed light frequency spectrum and standard frequency spectrum approaching by above-mentioned standard frequency spectrum.Then, see also the 4th step (44), the first mixed light frequency spectrum is become trichromatic chromaticity coordinates by a color filter color separation, and calculate the area that the three primary colors chromaticity coordinates is formed.To be that LCD is employed be divided into trichromatic filter to color filter.The area of forming when trichromatic chromaticity coordinates is bigger, and then the picture color saturation degree of LCD is better.This step is to be used for detecting color saturation.If color saturation is not good, can readjust the concentration of fluorescent material.Then, in the 5th step (45), calculate the chromaticity coordinates position of the white light of forming by three primary colors.When the chromaticity coordinates positional fault of white light, just must readjust the ratio of fluorescent material.Or even the chromaticity coordinates that can adjust white light is positioned at the chromaticity coordinates position of the black body radiation of a certain colour temperature.In Fig. 4, have only with two kinds of fluorescent material and represent embodiments of the invention.Yet, can use the 3rd fluorescent material simultaneously, the 4th fluorescent material, or even the 5th fluorescent material is applied to the present invention.
According to the flow process of Fig. 4, the present invention also provides a kind of system that disposes the high color saturation light-emitting diode (LED) backlight module, describes in detail to see also Fig. 5.One first database (51) is in order to emission spectrum, one first fluorescent material emission spectrum and the one second fluorescent material emission spectrum of storing a light emitting diode.One first colour mixture unit (52), in order to calculate the mixed light frequency spectrum of light emitting diode, first fluorescent material and second fluorescent material in first database (51), wherein the mixed light frequency spectrum is one first mixed light frequency spectrum.One standard color temperature frequency spectrum generator (53) is in order to be created in the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.One frequency spectrum comparing unit (54) is in order to compare the standard frequency spectrum that the first mixed light frequency spectrum and standard color temperature frequency spectrum generator (53) are produced.When the judgement of frequency spectrum comparing unit (54) be the first mixed light frequency spectrum near the visible light transmitted by black-body radiation frequency spectrum under first colour temperature, then down a stage transmits with the data of the first mixed light frequency spectrum.If comparison result is kept off, then can recalculate the first colour mixture frequency spectrum, till comparison result is approaching by the first colour mixture unit (52).
Please continue with reference to Fig. 5, one second database (55), in order to store the optical filtering frequency spectrum of a color filter, wherein color filter is the color separation filter as LCD.One filter element (56) calculates the trichromatic chromaticity coordinates of the first mixed light frequency spectrum by the optical filtering frequency spectrum of second database.Color saturation computing unit (57) is in order to calculate the area that trichromatic chromaticity coordinates is formed.When area is little compared to the defined area of NTSC, or be little compared to the specification of the color saturation of commercial definition, then return the first colour mixture unit (52) and recalculate the first colour mixture frequency spectrum, till can passing through the requirement of color saturation computing unit (57).The second colour mixture unit (58) is in order to calculate the chromaticity coordinates of the white light after the three primary colors colour mixture.When the white color coordinate of General Definition is left in the chromaticity coordinates position of white light, also must get back to the first colour mixture unit (52) and recalculate the first colour mixture frequency spectrum, till can passing through the requirement of the second colour mixture unit (58).In the present invention, the chromaticity coordinates that can also set white light must drop on the colour temperature of the black body radiation of setting, and for example colour temperature is the white color coordinate of 6500K.
Following each relevant indicators will be in order to describe each preferred embodiment of the present invention in detail.Fig. 6 is the compound method flow chart of high color rendering white light emitting diode.First step (61) calculates the visible light spectrum of black body radiation under a certain specific colour temperature.In the present embodiment, be with the Planck equation formula
Calculate the visible light spectrum of the black body radiation of target colour temperature.Yet, from its development of above-mentioned black body radiation, also can use the Rayleigh-Jeans equation, the Stefan-Boltzmann equation, or the Wien equation is as the frequency spectrum of the black body radiation of simplifying.Set a target colour temperature and with Planck equation formula (Planck ' s Law), (reference color temperature can be from 2500K～8000K), be the visible light spectrum of the black body radiation of target colour temperature to calculate the frequency spectrum of colour temperature.In this step, the visible light spectrum of the black body radiation of target colour temperature is by T
a(λ) expression.
Second step (62) promptly provides emission spectrum, the first fluorescent material emission spectrum and the second fluorescent material emission spectrum of known luminescence diode chip for backlight unit.As two or more fluorescent material, just need provide the emission spectrum of all fluorescent material.In this step, the emission spectrum of light-emitting diode chip for backlight unit measurement is to be represented by L (λ); The emission spectrum that first fluorescent material is measured is to be represented by P1 (λ); And the emission spectrum of the second fluorescent material measurement is to be represented by P2 (λ).
Third step (63) is according to the visible light spectrum of first step calculate black body radiation under a certain specific colour temperature, mix the concentration of all fluorescent material, calculate light-emitting diode chip for backlight unit, the first fluorescent material concentration and the mixed mixing emission spectrum of the second fluorescent material concentration then.A kind of account form is as described in the equation (2):
C
a(λ)＝a×L(λ+Δλ)+b×P1(λ+Δλ)+c×P2(λ+Δλ)
Ask
But the little value of Right See Guang Frequency Spectrum Wei Very it (a, b, c)
(2)
Wherein, mix emission spectrum by C
a(λ) expression;
The luminous intensity of light-emitting diode chip for backlight unit is represented by a;
The concentration of first fluorescent material is represented by b; And
The concentration of second fluorescent material is represented by c.
Above-mentioned mode is wherein a kind of account form, yet any those of ordinary skills ought to use other equation to calculate the concentration of each fluorescent material.The mixed light frequency spectrum C that calculates according to aforesaid way
a(λ) be the first mixed light frequency spectrum.
The 4th step (64) is calculated the color separation under a color filter of the first mixed light frequency spectrum and is become red, green, the area of being formed with the trichromatic chromaticity coordinate of blueness.At first the optical filtering frequency spectrum according to color filter becomes red, green and blue with the first mixed light frequency spectrum color separation.Then, calculate red, green and blue chromaticity coordinates at CIE.Red, green and blue chromaticity coordinates has been arranged, can calculate by red, the green and blue area that is surrounded at the CIE coordinate.This area can be compared with the defined area of NTSC.For example the area that trichromatic chromaticity coordinates surrounded that ought calculate is about 75% the defined area of NTSC, just represents that color saturation is 75% NTSC.With algorithm of the present invention, can regulation require the light source of white light emitting diode must reach 90% NTSC, 95% NTSC or 100% NTSC.Otherwise must get back to the concentration of third step (63) redistribution fluorescent material or ratio etc.
The chromaticity coordinate of the redness after the 5th step (65) the calculating color separation, the white light that green and blue chromaticity coordinate is formed.Through the three primary colors after the color filter color separation, the chromaticity coordinates of the white light of being formed might leave the white light or the desired white light of commercial formats of standard, so must check the white light after the colour mixture whether can reach requirement simultaneously.Coml specification, the chromaticity coordinates that can require white light are the colour temperatures that is positioned at a certain black body radiation, and the colour temperature that for example can require white light is the white color coordinate of 6500K or the white color coordinate of 6000K.
The flow chart of collocation Fig. 6, the present invention provides a kind of block diagram of preparation of high color rendering white light emitting diode simultaneously.See also Fig. 7, the black body radiation generator (71) of a target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.One first database (72) is used for storing the emission spectrum of various light-emitting diode chip for backlight unit and fluorescent material.Long wave ultraviolet light light-emitting diode chip for backlight unit transmitting boundary is that 365nm～380nm, purple-light LED chip transmitting boundary are that 380nm～420nm and blue LED chip transmitting boundary are 420nm～470nm.The emission wavelength scope of fluorescent material can be between 480～580nm, and composition can be silicates, or the oxide family, for example:
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600～650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any those of ordinary skills ought to understand the fluorescent material that other kinds can be arranged and can be applied among the present invention, garnet family for example, nitrogen oxide etc.
Frequency spectrum computing unit (73) obtains the emission spectrum of light-emitting diode chip for backlight unit and two kinds of different fluorescent material from first database (72), and judges fluorescent material concentration earlier.Get a mixed light frequency spectrum via frequency spectrum computing unit (73).See also Fig. 8, be the mixed light frequency spectrum of the different fluorescent material mixing of light-emitting diode chip for backlight unit with two kinds.In Fig. 8, curve A is the emission spectrum of light-emitting diode chip for backlight unit, and curve B and curve C are the emission spectrum of fluorescent material, and curve D is mixed mixing emission spectrum.
The visible light spectrum of the black body radiation of frequency spectrum comparing unit (74) comparison object colour temperature and the frequency spectrum similarity of mixed light frequency spectrum.Reach Frequency spectrum ratio to similar (Yes) as the mixed light frequency spectrum, then obtain a suitable white light emission spectrum; As mix emission spectrum and do not reach Frequency spectrum ratio similar (No), then need adjust the concentration (76) of fluorescent material or reselect fluorescent material (77), up to the visible light spectrum of the black body radiation of target colour temperature and the Frequency spectrum ratio of mixing emission spectrum to reach similar till.
The present invention provides a kind of block diagram of preparation of high color rendering white light emitting diode simultaneously, sees also Figure 10.The black body radiation generator (100) of one target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.One first database (101) is used for storing the emission spectrum of various light-emitting diode chip for backlight unit and fluorescent material.Long wave ultraviolet light light-emitting diode chip for backlight unit transmitting boundary is that 365nm～380nm, purple-light LED chip transmitting boundary are that 380nm～420nm and blue LED chip transmitting boundary are 420nm～470nm.The emission wavelength scope of fluorescent material can be between 480～580nm, and composition can be silicates, or the oxide family, for example:
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600～650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any those of ordinary skills ought to understand the fluorescent material that other kinds can be arranged and can be applied among the present invention, garnet family for example, nitrogen oxide etc.
The light-emitting diode chip for backlight unit that frequency spectrum computing unit (102) obtains from first database (101) and the emission spectrum of two kinds of different fluorescent material, and, judge fluorescent material concentration by the visible light spectrum of relatively producing the black body radiation that rises the target colour temperature from the black body radiation generator (100) of target colour temperature.Get a mixed light frequency spectrum via frequency spectrum computing unit (102).
The optical filtering frequency spectrum of color filter is stored and provided to second database (103).See also Fig. 9, show a kind of frequency spectrum of color filter, wherein the optical filtering frequency spectrum of filter of all kinds is understood the staggered of some.Because the optical filtering frequency spectrum of filter of all kinds is staggered, even the light source of the white light emitting diode of high color rendering also can reduce the saturation degree of color by such optical filtering frequency spectrum.This is that light source of each coloured light that this expression is original all can exert an influence to last color because understand the green light of some behind the such optical filtering frequency spectrum of blue-light source process.Mixed light frequency spectrum after calculating enters into second database (103) and understands color separation one-tenth redness afterwards, and green is with the three primary colors of blueness.After these trichromatic data enter into color saturation computing unit (104) and colour mixture computing unit (105), calculate the chromaticity coordinates of the white light of forming through the trichromatic color saturation after the color separation and the three primary colors after the color separation respectively.
After result calculated enters into comparing unit (107), can judge whether the chromaticity coordinates of the white light that the three primary colors after color saturation and the color separation are formed meets the demands.When one of them does not satisfy, all can get back to first database (101) and reselect the concentration of fluorescent material or frequency spectrum computing unit (102) redistribution fluorescent material, make the color saturation computing unit (104) and the result of colour mixture computing unit (105) all meet the demands.The condition of color saturation can be decided to be 90% NTSC, 95% NTSC or 100% NTSC.And the white light after the colour mixture can require the white light or the desired white light of commercial formats of standard, coml specification wherein, the chromaticity coordinates that can require white light is the colour temperature that is positioned at a certain black body radiation, and the colour temperature that for example can require white light is the white color coordinate of 6500K or the white color coordinate of 6000K.
Figure 11 shows the system block diagram of configuration high color rendering white light emitting diode of the present invention.The frequency spectrum generator (110) of the black body radiation of one target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.
First database (111) is used for storing the emission spectrum of various light-emitting diode chip for backlight unit and fluorescent material.Long wave ultraviolet light light-emitting diode chip for backlight unit transmitting boundary is that 365nm～380nm, purple-light LED chip transmitting boundary are that 380nm～420nm and blue LED chip transmitting boundary are 420nm～470nm.The emission wavelength scope of fluorescent material can be between 480～580nm, and composition can be silicates, or the oxide family, for example:
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600～650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any those of ordinary skills ought to understand the fluorescent material that other kinds can be arranged and can be applied among the present invention, for example garnet family, nitrogen oxide etc.
Frequency spectrum computing unit (112) obtains the emission spectrum of light-emitting diode chip for backlight unit and two kinds of different fluorescent material from first database (111), and judges fluorescent material concentration earlier.Get a mixed light frequency spectrum via frequency spectrum computing unit (112).
The visible light spectrum of the black body radiation of frequency spectrum comparing unit (113) comparison object colour temperature and the frequency spectrum similarity of mixed light frequency spectrum.Comparative result is first rank approximate (114).The result approximate when first rank is fine (Yes), and then down a stage carries out.The result approximate when first rank is not all right (No), then gets back to frequency spectrum computing unit (112), finds out the concentration of other fluorescent material again, till the result of first rank approximate (114) is fine (Yes).
The optical filtering frequency spectrum of color filter is stored and provided to second database (116).Mixed light frequency spectrum after calculating enters into branch color element (115) and understands the three primary colors that color separation becomes red, green and blueness afterwards.After these trichromatic data enter into color saturation computing unit (117) and three primary colors colour mixture computing unit (118), calculate the chromaticity coordinates of the white light of forming through the trichromatic color saturation after the color separation and the three primary colors after the color separation respectively.
After result calculated enters into comparing unit (119), can judge whether the chromaticity coordinates of the white light that the three primary colors after color saturation and the color separation are formed meets the demands.When one of them does not satisfy, all can get back to the concentration of frequency spectrum computing unit (112) redistribution fluorescent material, make the color saturation computing unit (117) and the result of three primary colors colour mixture computing unit (118) all meet the demands.The condition of color saturation can be decided to be 90% NTSC, 95% NTSC or 100% NTSC.And the white light after the colour mixture can require the white light or the desired white light of commercial formats of standard, coml specification wherein, the chromaticity coordinates that can require white light is the colour temperature that is positioned at a certain black body radiation, and the colour temperature that for example can require white light is the white color coordinate of 6500K or the white color coordinate of 6000K.
Figure 12 shows high color saturation light-emitting diode (LED) backlight module of the present invention, and the NTSC standard is with general CIE 1931 chromaticity coordinate schematic diagrames backlight.When using method of the present invention or system, can promote color saturation compared to the light source of general white light emitting diode.In Figure 12, the three primary colors that use mode of the present invention are to indicate with triangular form, and wherein color saturation can be by the gore product representation that triangular form surrounded.Compared to by zero triangle area that is surrounded, more approaching by triangle area that square surrounded.This expression the present invention can have better color saturation.
The present invention is except that can be two kinds of fluorescent material of the described mixing of the foregoing description, and the fluorescent material quantity of aforementioned mixing also can increase to three kinds, so can make required that the present invention more can realistic application.Certainly the embodiment that does not limit to above-mentioned two or three fluorescent material during practice can use fluorescent material more than three kinds to reach user's demand in case of necessity.
From the foregoing description, can find out means of the present invention, be to use the Planck equation to calculate the frequency spectrum of the black body radiation of design temperature, calculate first approximate concentration of multiple fluorescent material with this spectrometer.According to the luminous frequency spectrum that calculates after the allotment of first approximate concentration of each fluorescent material after the light emitting diode colour mixture, and luminous according to this frequency spectrum calculate through the color saturation behind the color filter and again mixed light become the chromaticity coordinates of white light, so as to revising the concentration of fluorescent material, or select other fluorescent material.
Utilize means of the present invention, can reach the effect that can mix the light-emitting diode (LED) backlight module of high color saturation fast, and can significantly reduce the time cost of trial and error.
From means of the present invention and the effect that has, can obtain the present invention and have many advantages.At first, need can not find out the allotment ratio of fluorescent material via the mode of trial and error.Simultaneously, when the fluorescent material of multiple class can supply allotment, can significantly reduce the research and development time.
Apparently, according to the description among the top embodiment, the present invention has many corrections and difference.Therefore need be understood in the scope of its additional claim item, except above-mentioned detailed description, the present invention can also implement in other embodiment widely.Above-mentioned is the preferred embodiments of the present invention only, is not in order to limit the scope of claims of the present invention; All other changes or modifies not breaking away from the equivalence finished under the disclosed spirit, all should be included in the scope of following claims.
Claims (11)
1. a configuration has the method for the light-emitting diode (LED) backlight module of high color saturation, comprises:
Calculate a standard frequency spectrum;
The emission spectrum of one light emitting diode, one first fluorescent material and one second fluorescent material is provided;
Adjust the concentration of this first fluorescent material and second fluorescent material, behind this first fluorescent material and second fluorescent material and this light emitting diode mixed light, obtain one first mixed light frequency spectrum, make that this first mixed light frequency spectrum and this standard frequency spectrum are approaching;
This first mixed light frequency spectrum is become trichromatic chromaticity coordinates by a color filter color separation, and calculate the area that this three primary colors chromaticity coordinates is formed;
The chromaticity coordinates position of the white light that calculating is made up of these three primary colors.
2. a configuration has the method for the light-emitting diode (LED) backlight module of high color saturation, comprises:
The black body radiation luminous frequency spectrum of calculating under one first colour temperature;
The concentration of adjusting the multi-fluorescence powder make with a light emitting diode mixed light after frequency spectrum near at the luminous frequency spectrum of this black body radiation;
Frequency spectrum behind the mixed light becomes red, green and blue chromaticity coordinate by color separation behind the color filter;
Whether calculate this redness, the green area of forming with the chromaticity coordinate of blueness near NTSC; And
Whether the chromaticity coordinate position of the white light of synthetic this redness, green and blueness satisfies the white light of this first colour temperature.
3. a configuration has the method for the light-emitting diode (LED) backlight module of high color saturation, comprises:
Utilize the black body radiation luminous frequency spectrum of Planck equation formula calculating under one first colour temperature;
The emission spectrum of one light emitting diode, one first fluorescent material and one second fluorescent material is provided;
Adjust the concentration of this first fluorescent material and second fluorescent material, behind this first fluorescent material and second fluorescent material and this light emitting diode mixed light, obtain one first mixed light frequency spectrum, make that this first mixed light frequency spectrum and this standard frequency spectrum are approaching;
Frequency spectrum behind this mixed light becomes red, green and blue chromaticity coordinate by color separation behind the color filter;
Calculate this redness, the green area of forming with the chromaticity coordinate of blueness; And
The chromaticity coordinate position of the white light of synthetic this redness, green and blueness.
4. have the method for the light-emitting diode (LED) backlight module of high color saturation according to claim 1,2 or 3 described configurations, the first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3O1
2: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3O1
2Or (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12
5. configuration according to claim 4 has the method for the light-emitting diode (LED) backlight module of high color saturation, and the second wherein above-mentioned fluorescent material can be CaAlSiN
3: Eu, (CaEu) AlSiN
3, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.
6. a configuration has the system of the light-emitting diode (LED) backlight module of high color saturation, comprises:
In order to calculate the means of the luminous frequency spectrum of black body radiation under one first colour temperature;
In order to the concentration of adjusting the multi-fluorescence powder make with a light emitting diode mixed light after frequency spectrum near means at the luminous frequency spectrum of this black body radiation;
Frequency spectrum behind the mixed light is by becoming the means of the chromaticity coordinate of red, green and blueness in order to color separation behind the color filter;
In order to calculate the means of the area that this redness, green and the chromaticity coordinate of blueness form; And
Means in order to the chromaticity coordinate position of synthesize white light.
7. a configuration has the system of the light-emitting diode (LED) backlight module of high color saturation, comprises:
One first database, in order to a lumination of light emitting diode frequency spectrum to be provided, one first light-emitting phosphor frequency spectrum is with one second light-emitting phosphor frequency spectrum;
One standard frequency spectrum generator is in order to be created in the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature;
One first colour mixture unit, in order to calculate the mixed light frequency spectrum of this light emitting diode, this first fluorescent material and this second fluorescent material in this first database, wherein this mixed light frequency spectrum is one first mixed light frequency spectrum;
One frequency spectrum comparing unit is in order to compare the standard frequency spectrum that this first mixed light frequency spectrum and this standard color temperature frequency spectrum generator are produced;
One second database is in order to store the optical filtering frequency spectrum of a color filter;
One filter element calculates the trichromatic chromaticity coordinates of this first mixed light frequency spectrum by the optical filtering frequency spectrum of this second database;
One color saturation computation unit is in order to calculate the area that this trichromatic chromaticity coordinates is formed; And
One second colour mixture unit is in order to calculate the chromaticity coordinates of the white light after this three primary colors colour mixture.
8. have the system of the light-emitting diode (LED) backlight module of high color saturation according to claim 6 or 7 described configurations, the first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3O1
2: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3O1
2Or (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12
9. configuration according to claim 8 has the system of the light-emitting diode (LED) backlight module of high color saturation, and the second wherein above-mentioned fluorescent material can be CaAlSiN
3: Eu, (CaEu) AlSiN
3, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.
10. one kind is calculated multi-fluorescence powder concentration to obtain the method for high color saturation light-emitting diode (LED) backlight module, comprises:
The concentration of adjusting the multi-fluorescence powder make with a light emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature; And
After becoming three primary colors via the frequency spectrum color separation of a color filter after, make area and white color coordinate that this trichromatic chromaticity coordinate is formed to meet the demands with this mixed light.
11. one kind is used two stage being similar to find out the method for various fluorescent material in the allotment ratio of high color saturation light-emitting diode (LED) backlight module, comprises:
Mix mixed proportion near the various fluorescent material of black body radiation; And
The allotment ratio of the composition area of the chromaticity coordinates from the three primary colors that a color filter color separation goes out and these various fluorescent material of chromaticity coordinates correction of white light.
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