CN111400901B - Quantum dot matching method and photoluminescence component preparation method - Google Patents
Quantum dot matching method and photoluminescence component preparation method Download PDFInfo
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- 239000002096 quantum dot Substances 0.000 title claims abstract description 142
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- 238000005424 photoluminescence Methods 0.000 title claims description 9
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- 239000004973 liquid crystal related substance Substances 0.000 description 3
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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Abstract
The invention provides a quantum dot matching method, which comprises the steps of obtaining target parameters, adopting a Gaussian spectrum simulation method, firstly setting optical parameters of quantum dots, and then adjusting the optical parameters of the quantum dots through iterative calculation, so as to obtain the optical parameters and the proportion of the quantum dots, wherein the optical parameters and the proportion of the quantum dots can realize the target parameters. The preparation method can save the verification cost of the quantum dot formula and obtain the optimal display effect.
Description
Technical Field
The invention relates to the technical field of quantum dot display, in particular to a quantum dot matching method and a photoluminescence component preparation method.
Background
Along with the bottleneck of the liquid crystal display technology, the quantum dot display technology starts to form a brand-new angle in the display field due to the advantages of narrow half-peak width, high color gamut, high color purity and the like. The existing mature quantum dot display technical scheme is that a traditional liquid crystal display panel structure is combined with a quantum dot backlight source based on a photoluminescence principle, the spectrum shape of the quantum dot backlight source is narrow in half-peak width, and the quantum dot backlight source is separated from each other in a three-primary-color area, so that spectral lines are pure. The main optical parameters often needed to be concerned by the display device are white-field chromaticity coordinates, color gamut and brightness, wherein the maximum white balance chromaticity coordinates (white-field chromaticity coordinates) after the device is screened are fixed values. In the prior art, the requirements of color points and color gamut brightness limit values are generally given, then conventional quantum dots are adjusted to the color points and manufactured into quantum dot assemblies, the quantum dot assemblies are used in display equipment to obtain color gamut values and brightness values through experimental tests, and if the color gamut values and the brightness values are not matched, the quantum dots are reselected and manufactured into the quantum dot assemblies again until the requirements are met.
Disclosure of Invention
The invention aims to provide a quantum dot matching method and a photoluminescence component preparation method, which are used for solving the problem that the quantum dot matching in the prior art is time-consuming and labor-consuming.
According to a first aspect of the present application, there is provided a quantum dot matching method, including a step of obtaining a target parameter, obtaining a target white-field chromaticity coordinate (x, y), and calculating a ratio of the target white-field chromaticity coordinate x to y, where the obtained ratio is V; acquiring target brightness L and target color gamut area ratio P;
a simulation step, namely determining initial half peak widths and initial peak wavelengths corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances respectively, and assuming that the initial peak energies of the spectrums corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances are respectively specific values, and simulating the spectrums by using a Gaussian function to obtain initial white light simulation spectrums;
a step of obtaining simulation parameters, in which a color tristimulus value is calculated according to an initial white light simulation spectrum, white field chromaticity coordinates (x 1, Y1) are obtained through calculation, luminous flux Y and RGB chromaticity coordinates are obtained through calculation, a simulation brightness value L1 is obtained through calculation, wherein L1=mY is used as a vertex to construct a triangle, the area S1 of the triangle is calculated, the area S1 is compared with the triangle area S2 corresponding to a color gamut standard, the simulated color gamut area ratio P1 is obtained, m is larger than 0, and m is a numerical value obtained through actual measurement;
the first adjustment step, calculating the ratio of x1 to y1 in the simulated white field chromaticity coordinates, wherein the obtained ratio result is V1; calculating a first difference between V and V1, and if the first difference is between a and b, performing a second adjustment step; if the first difference is larger than b or smaller than a, directly returning to the simulation step, and only adjusting the peak energy of any first color in the RGB three colors according to a first adjustment rule, and keeping other parameters unchanged; under a first regulation rule, obtaining an adjustable range of peak energy of a first color spectrum, wherein a is smaller than b, and the absolute values of a and b are taken from any numerical value of 0-0.005;
the first adjustment rule is: if the first difference value is larger than b, the peak energy of the first color spectrum is increased, and after repeating the step of obtaining the simulation parameters and the first adjustment step at least once, the adjusted first difference value is between a and b; if the first difference value is smaller than a, reducing the spectrum peak energy of the first color, and repeating the step of obtaining the simulation parameters at least once and the first adjustment step at least once, so that the adjusted first difference value is between a and b;
a second adjustment step of adjusting or not adjusting the peak energy of the second color spectrum so that a second difference value between x of the target white chromaticity coordinate and the analog white chromaticity coordinate x1 is between a and b, a third difference value between y of the target white chromaticity coordinate and the analog white chromaticity coordinate y1 is between a and b, and fine-tuning the peak energy of the first color spectrum in an adjustable range so that the first difference value is between a and b;
a third adjustment step of comparing the magnitudes of the target luminance L and the analog luminance value L1, and comparing the magnitudes of the target color gamut area ratio P and the analog color gamut area ratio P1; if the simulated brightness value L1 is greater than or equal to the target brightness L and the simulated color gamut area ratio P1 is greater than or equal to the target color gamut area ratio P, not adjusting, otherwise adjusting according to a second adjusting rule; the step of adjusting according to the second adjustment rule comprises the steps of returning to the simulation step, adjusting at least one parameter of the peak wavelength of the red quantum dot, the half-peak width of the red quantum dot, the peak wavelength of the green quantum dot and the half-peak width of the green quantum dot, simulating the spectrum by using a Gaussian function to obtain an adjusted white light simulation spectrum combination, calculating adjusted L1 'and P1' of the adjusted white light simulation spectrum combination according to the method of obtaining the simulation parameter step, and repeating the third adjustment step for adjustment until the adjusted L1 'and P1' respectively meet the target brightness L and the target color gamut area ratio P, and terminating the adjustment;
recording, namely recording the peak wavelength of the corresponding red quantum dot, the half-peak width of the red quantum dot and the peak energy of the spectrum of the red quantum dot when the target requirement is met, and the peak wavelength of the green quantum dot, the half-peak width of the green quantum dot and the peak energy of the spectrum of the green quantum dot.
Further, the display device is provided with a color filter, in the step of obtaining the simulation parameters, spectrum information of the color filter is obtained, the spectrum information is combined with an initial white light simulation spectrum, a color tristimulus value is calculated, and chromaticity coordinates (x 1, y 1) of a white field are calculated; and calculating chromaticity coordinates of the three colors of luminous flux Y and RGB after passing through the color filter, thereby calculating an analog luminance value L1.
Further, the second adjustment rule is: the peak wavelength of the red quantum dots is increased, so that the analog brightness value L1' can be reduced, the NTSC-1931 color gamut area ratio is increased, and the DCI-P3-1976 color gamut area ratio is increased; the peak wavelength of the red quantum dots is reduced, so that the analog brightness value L1' can be increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is reduced; the peak wavelength of the green quantum dot is increased, so that the analog brightness value L1 is increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is increased; the peak wavelength of the green quantum dot is reduced, so that the analog brightness value L1' can be reduced, the NTSC-1931 color gamut area ratio is increased, and the DCI-P3-1976 color gamut area ratio is reduced.
Further, the corresponding simulated brightness when the target requirement is met is at least 105% of the target brightness, and the corresponding simulated color gamut area ratio when the target requirement is met is at least 2% higher than the target color gamut area ratio.
Further, the corresponding simulated brightness when the target requirement is met is at least 110% of the target brightness, and the corresponding simulated color gamut area ratio when the target requirement is met is at least 4% higher than the target color gamut area ratio.
Further, the blue luminescent material is an LED, or an OLED, or a QLED, or a micro-LED.
Further, in the simulation step, the peak wavelength of the blue light-emitting material was selected to be 447 to 453nm or 470nm, and the half-width of the blue light-emitting material was selected to be 20 nm.+ -. 2nm.
Further, a= -0.001, b= 0.001.
Further, in the simulating step, the spectrum is simulated by using a Gaussian function, and the initial white light simulation spectrum is obtained by fitting the quantum yield of the red quantum dots, the quantum yield of the green quantum dots and the photon utilization rate of the blue illuminant.
According to a first aspect of the present application, there is provided a method for preparing a photoluminescent component, the photoluminescent component comprising red quantum dots and green quantum dots, wherein the half-peak widths of the red quantum dots and the green quantum dots, the luminescence peak wavelength and the ratio information of the red quantum dots and the green quantum dots are obtained according to any one of the above quantum dot matching methods.
By applying the technical scheme, the verification cost of the quantum dot formula can be saved, and the optimal display effect can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic flow chart of a matching method of the present application.
Fig. 2 is a graph showing actual measurement of CF spectrum of a known display device according to embodiment 1 of the present application.
Fig. 3 is a spectrum test chart of a known display device according to embodiment 1 of the present application.
Fig. 4 is a comparison of a spectral simulation diagram corresponding to a quantum dot formulation selected and determined in example 1 of the present application and a spectral test diagram of a known display device.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
According to a first aspect of the present application, there is provided a quantum dot matching method, the method comprising: a step of acquiring target parameters, in which a target white-field chromaticity coordinate (x, y) is acquired, the ratio of the target white-field chromaticity coordinate x to the target white-field chromaticity coordinate y is calculated, and the acquired ratio result is V; acquiring target brightness L and target color gamut area ratio P;
a simulation step, namely determining initial half peak widths and initial peak wavelengths corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances respectively, and assuming that the initial peak energies of the spectrums corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances are respectively specific values, and simulating the spectrums by using a Gaussian function to obtain initial white light simulation spectrums;
a step of obtaining simulation parameters, in which a color tristimulus value is calculated according to an initial white light simulation spectrum, white field chromaticity coordinates (x 1, Y1) are obtained through calculation, chromaticity coordinates of light flux Y and RGB are obtained through calculation, a simulation brightness value L1 is calculated, wherein L1=mY is used as a vertex to construct a triangle, the area S1 of the triangle is calculated, the area S1 is compared with the triangle area S2 corresponding to a color gamut standard, the simulated color gamut area ratio P1 is obtained, m is larger than 0, and m is a numerical value obtained through actual measurement; a first adjustment step, namely calculating the ratio of x1 to y1 in the simulated white field chromaticity coordinates, wherein the obtained ratio result is V1, calculating a first difference value between V and V1, and if the first difference value is between a and b, performing a second adjustment step; if the first difference is larger than b or smaller than a, directly returning to the simulation step, and only adjusting the peak energy of any first color in red, green and blue according to a first adjustment rule, wherein other parameters (half-peak width and initial peak wavelength of red, green quantum dots and blue luminescent materials) are kept unchanged; under a first regulation rule, obtaining an adjustable range of peak energy of a first color spectrum, wherein a is smaller than b, and the absolute values of a and b are taken from any numerical value of 0-0.005;
the first adjustment rule is: if the first difference value is larger than b, the peak energy of the first color spectrum is increased, and after repeating the step of obtaining the simulation parameters and the first adjustment step at least once, the adjusted first difference value is between a and b; if the first difference value is smaller than a, the value of the spectrum peak energy of the first color is reduced, and after repeating the step of obtaining the simulation parameter and the first adjustment step at least once, the adjusted first difference value is between a and b;
a second adjustment step of adjusting or not adjusting (not adjusting refers to the case where the white chromaticity coordinates directly satisfy the target requirements) the magnitude of the peak energy of the second color spectrum so that the second difference between x of the target white chromaticity coordinates and the analog white chromaticity coordinates x1 is between a and b, and the third difference between y of the target white chromaticity coordinates and the analog white chromaticity coordinates y1 is between a and b, and fine-tuning the magnitude of the peak energy of the first color spectrum in an adjustable range, and making the first difference between a and b;
a third adjustment step of comparing the magnitudes of the target luminance L and the analog luminance value L1, and comparing the magnitudes of the target color gamut area ratio P and the analog color gamut area ratio P1; if the simulated brightness value L1 is greater than or equal to the target brightness L and the simulated color gamut area ratio P1 is greater than or equal to the target color gamut area ratio P, not adjusting, otherwise adjusting according to a second adjusting rule; the step of adjusting according to the second adjustment rule comprises the steps of returning to the simulation step, adjusting at least one parameter of the peak wavelength of the red quantum dot, the half-peak width of the red quantum dot, the peak wavelength of the green quantum dot and the half-peak width of the green quantum dot, simulating the spectrum by using a Gaussian function to obtain an adjusted white light simulation spectrum combination, calculating adjusted L1 'and P1' of the adjusted white light simulation spectrum combination according to the method of obtaining the simulation parameter step, and repeating the third adjustment step for adjustment until the adjusted L1 'and P1' respectively meet the target brightness L and the target color gamut area ratio P, and terminating the adjustment;
recording, namely recording the peak wavelength of the corresponding red quantum dot, the half-peak width of the red quantum dot and the peak energy of the spectrum of the red quantum dot when the target requirement is met, and the peak wavelength of the green quantum dot, the half-peak width of the green quantum dot and the peak energy of the spectrum of the green quantum dot. "satisfying" means that the adjusted parameter is greater than or equal to the target parameter, i.e. the adjusted brightness and color gamut are not less than the target requirement, and the target requirement means that all the target parameters are satisfied. The "first color" may be any one of red, green and blue. If the improvement is based on the existing optical parameters, the peak energy of one of the colorbands is equal to the peak energy of the corresponding band of the actual measurement; if there is no basis for optical parameters, the peak energy of all bands can be made equal and equal to a specific value.
The following is a specific description of the calculation process. The spectral shape of each discrete spectrum of the quantum dot light source is similar to a gaussian distribution (normal distribution) in that the quantum dot light source spectrum can be fitted on the basis of a gaussian function.
Common gaussian functions are:
the value of F can be calculated according to the calculation formula (3) from the definition of the full width at half maximum FWHM.
F＝2*(xi-E) (3)
Where F represents a full width at half maximum (FWHM), A represents peak radiant energy, E represents peak wavelength, xi represents any wavelength in the visible light band (380 nm-780 nm), and F (xi) represents peak radiant energy corresponding to the wavelength of xi.
x (lambda) represents any wavelength in the visible light band, lambda represents a wavelength, and phi can be used ne (lambda) represents the spectral energy distribution, so the Gaussian fitted spectrum of the quantum dot light source can be fitted according to A, E, F three optical parameters, and the fitting calculation formula is as follows:
the tristimulus values of the spectrum can be obtained according to the formula (4), see the formula (5)
Wherein K (X, Y, Z) (lambda) is the spectral tristimulus value of CIE 1931, X, Z represents chromaticity; in this application, "X" and "X" have the same meaning, and "Y" have the same meaning.
The chromaticity coordinates of the spectrum are (x, y), and the calculation formula is as follows:
x＝X/(X+Y+Z)
y＝Y/(X+Y+Z) (6)
quantum dot display technologies can be categorized into electroluminescence and photoluminescence. For the electroluminescent display technology composed of R, G, B three-primary-color quantum dots, the red band R is generally 600nm to 780nm, the green band G is generally 500nm to 600nm, the blue band B is generally 400nm to 500nm, and the chromaticity coordinates (x 2, Y2) and chromaticity coordinates (x 3, Y3) and chromaticity coordinates (x 4, Y4) and luminous flux Y3 of the three primary colors R and luminous fluxes Y1, G can be respectively obtained according to formulas (5) and (6). The white light after the display backlight is mixed is calculated as Y=Y1+Y2+Y3 by the luminous flux of the three primary colors.
According to the 3 chromaticity coordinates of the three primary colors, constructing a triangle by taking the three-point coordinates as vertexes, wherein the area S of the triangle is as follows:
S＝(1/2)*(x2*y3+y2*x4+x3*y4-y3*x4-x2*y4-y2*x3) (7)
the method can also be used in the display backlight technology of light source spectrums conforming to Gaussian spectrums such as OLED, miniLED, microLED.
In the photoluminescence backlight technology, quantum Dots (QDs) are used as light conversion materials for stimulated emission (red QD band R is generally 600nm to 780nm, green QD band G is generally 500nm to 600 nm), and a blue B light source is commonly used as an excitation light source (wavelength 400nm to 500 nm).
The Gaussian function simulation spectrum is utilized to obtain an initial white light simulation spectrum by fitting the quantum yield of the red quantum dots, the quantum yield of the green quantum dots and the photon utilization rate of the blue illuminant. The white light source is generally composed of a three-color spectrum composed of red, green and blue wavebands, for the excitation spectrum of the quantum dots, the red and green quantum dots absorb the blue light with short wavelength to form the white light spectrum, the conversion efficiency between the quantum dots and the excitation light source is represented by quantum yield (Qys), the quantum yields corresponding to different quantum dots are different, and the quantum yields are calculated according to the given specification parameters. The quantum yield is defined as the ratio of the number of excitation photons to the number of absorption photons of the quantum dot, and the calculation formula of the number of photons N is as follows:
for quantum dot material with fixed half-peak width and peak wavelength, the utilization rate of the excitation light source is eta
Thus Gaussian fitting spectral energy distribution phi in the visible range ne (lambda) is
Wherein Ar, ag and Ab respectively represent the peak radiation energy of the red, green and blue wavebands of the white light source, er, eg and Eb respectively represent the peak wavelengths of the red, green and blue wavebands of the white light source, and Fr, fg and Fb respectively represent the half-peak widths of the red, green and blue wavebands of the white light source. The red band is generally 600nm to 780nm, the green band is generally 500nm to 600nm, and the blue band is generally 400nm to 500nm.
Quantum dot backlight is used in combination with liquid crystal and Color Filters (CF). In the step of obtaining simulation parameters, spectrum information of a color filter is obtained, and the spectrum information is combined with an initial white light simulation spectrum to calculate a color tristimulus value, so that chromaticity coordinates (x 1, y 1) of a white field are calculated; and calculating chromaticity coordinates of the three colors of luminous flux Y and RGB after passing through the color filter, thereby calculating an analog luminance value L1. The Color Filter (CF) has the greatest effect on the chromaticity coordinates of the white light source, so this application mimics only the effect of CF on chromaticity coordinates. The color tristimulus values after passing through CF were calculated as follows:
wherein Rcf (λ), gcf (λ), bcf (λ) represent the spectrum of three channels of white light passing through the color filter, and K (X, Y, Z) (λ) is the spectral tristimulus value of CIE 1931.
The color tristimulus value of the white field is R (X, Y, Z), G (X, Y, Z), and the calculation formula of B (X, Y, Z) is:
Z＝R X +G X +B X
Y＝R Y +G Y +B Y
Z＝R Z +G Z +B Z (12)
the chromaticity coordinates of the white field after passing through CF can be calculated as (x, y) according to the above formula (6) and formula (12). Three chromaticity coordinates (Rx, R) of the CIE 1931 standard chromaticity space can be obtained according to the formula (11) Y )、(G X ，G Y )、(B X ，B Y ) Constructing a triangle by taking the three-point coordinates as vertexes, wherein the area S of the triangle is as follows:
S＝(1/2)*(R X *G Y +R Y *B X +G X *B Y -G Y *B X -R X *B Y -R Y *G X ) (13)
in the display field, the common CIE color space has a CIE 1931 color space and a CIE 1976 color space, and the color gamut area ratio is P.
Taking the NTSC-1931 color gamut standard as an example, the area of triangle constructed by three channel chromaticity coordinates is 0.1582, so that the color gamut area ratio of the analog spectrum under the NTSC-1931 color gamut standard can be calculated to be S/0.1582.
Taking the DCI-P3-1976 color gamut standard as an example, the area of the triangle constructed by the standard three-channel chromaticity coordinates is 0.1582, so that the color gamut area ratio of the simulation spectrum under the DCI-P3-1976 color gamut standard can be calculated to be S/0.0815.
If the color gamut values under other color space standards are calculated, the three-channel chromaticity coordinates can be converted into the color coordinates of the standard color space and the area ratio between the calculated color coordinates and the standard color gamut according to the CIE formula.
Y is the simulated spectral luminous flux. Luminance L defines: the light source emits light flux in a unit solid angle per unit surface area in a certain direction. The common luminance meter for displaying test luminance tests luminance perpendicular to the display surface, wherein the luminance formula is l=phi/(s·Ω), where phi is luminous flux of the luminance meter test area, S is the luminance meter test area, Ω is solid angle of the test point relative to the luminance meter probe, and solid angle Ω=s/d in the vertical direction 2 Therefore, the calculation formula of the brightness and luminous flux in the measurement is shown as L=d 2 φ/S 2 . According to the above, the same measurementIn the test area, when the test distance is the same, the ratio of the brightness L to the luminous flux phi after passing through the screen is a fixed value, that is, m is a fixed value, and the attenuation values generated by each optical component in the same model for the luminous fluxes of different backlights are the same, so that the brightness L after exiting the screen and the luminous flux Y after simulating the backlight to exit the screen can be represented by a linear relation l=m×y. For a specific device to be simulated, the value of the coefficient m can be determined by testing the initial brightness value L of the device and the light flux value calculated by the initial simulated spectrum of the device.
In some embodiments, a= -0.001, b = 0.001.
In some embodiments, the second adjustment rule is: the peak wavelength of the red quantum dots is increased, so that the analog brightness value L1' can be reduced, the NTSC-1931 color gamut area ratio is increased, and the DCI-P3-1976 color gamut area ratio is increased; the peak wavelength of the red quantum dots is reduced, so that the analog brightness value L1' can be increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is reduced; the peak wavelength of the green quantum dot is increased, so that the analog brightness value L1 is increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is increased; the peak wavelength of the green quantum dot is reduced, so that the analog brightness value L1' can be reduced, the NTSC-1931 color gamut area ratio is increased, and the DCI-P3-1976 color gamut area ratio is reduced.
In some embodiments, the simulated luminance corresponding to meeting the target demand is at least 105% of the target luminance and the simulated gamut area ratio corresponding to meeting the target demand is at least 2% higher than the target gamut area ratio.
In some embodiments, the simulated luminance corresponding to meeting the target demand is at least 110% of the target luminance and the simulated gamut area ratio corresponding to meeting the target demand is at least 4% higher than the target gamut area ratio.
In some embodiments, the blue illuminant is an LED, or an OLED, or a QLED, or a micro-LED.
The quantum dot blending method is suitable for application research and development processes of electroluminescence or photoluminescence or electro-photoinduced mixed luminescence.
In some embodiments, in the simulating step, the peak wavelength of the blue illuminant is selected to be any one of 447 to 453nm or 470nm, and the half-width of the blue illuminant is selected to be 20nm±2nm.
According to another aspect of the application, a preparation method of a photoluminescent component is provided, the photoluminescent component comprises red quantum dots and green quantum dots, half-peak widths of the red quantum dots and the green quantum dots are provided, and the luminous peak wavelength and the proportion information of the red quantum dots and the green quantum dots are obtained according to any quantum dot matching method. The ratio information of quantum dots refers to the ratio of optical densities.
Example 1
A white field target chromaticity coordinate (0.2993,0.3227), a CF spectrum (see fig. 2), and a test spectrum (see fig. 3) of a quantum dot display device having an actual test luminance 410nit,CIE 1931NTSC and a color gamut 104.67% of a display device using a blue LED excitation quantum dot optical film are known. It is required to improve the optical parameters of the display device, and it is required that the screen brightness is not less than 430nit,CIE 1931NTSC and the color gamut is not less than 105% of the quantum dot display spectrum. The spectra were tested by a spectrocolorimeter (Hangzhou iridescence spectrum, model OHSP-350C). The test spectrum is the overscreen spectrum of the display device.
1, keeping half-peak width and peak wavelength parameters of an original quantum dot spectrum unchanged, and simulating a simulated spectrum conforming to the coordinates of a target white field chromaticity.
The ratio of the target white chromaticity coordinates x to y is V, v=x/y= 0.2993/0.3227 = 0.9275.
Let the peak energy of three monochromatic analog spectra be 1mw, i.e., ar=ag=ab=1 mw, the peak wavelength Eb of the blue LED be 448nm, the half-peak width Fb be 20nm, the red quantum dot optical parameters er=626nm, fr=27 nm, qys (R) =50%; eg=536nm, fg=29 nm, qys (G) =0.5, to obtain an initial white light analog spectrum, the peak energy of the red band in the analog spectrum is equal to the peak energy of the red band in fig. 3, to obtain peak energy ar=0.1393 mw, ag=0.1721 mw, ab= 1.4843mw satisfying the target chromaticity coordinates, the analog white chromaticity coordinates are x1= 0.2993, y1= 0.3227, the difference between the ratio V1 and the target color point ratio V is 0.00012, the color point difference x 1-x=0.00005, y 1-y=0.00002, and the five significant digits remain as a result. Let a= -0.001, b = 0.001. Fig. 4 shows the spectrum fitting after the previous step, with a spectral correlation coefficient of 0.99 and a fitting degree of 98%.
2 calculating analog luminance and color gamut
According to the formula (12), the luminous flux Y of the simulated spectrum of FIG. 4 is calculated to be 0.3043lm, and the value of the coefficient m is calculated to be 1347.4nit/lm according to the measured luminance 410 nit. If the brightness of the display device is not less than 430nit, the display spectrum luminous flux Y should be not less than 0.3191lm.
From the device CF spectrum and equation (13), it can be calculated that the CIE 1931NTSC color gamut of the analog spectrum of fig. 4 is 106.35%, the difference between the analog value and the actual value of the color gamut is-1.68%, and if the luminance of the display device is increased to 105% for the CIE 1931NTSC color gamut, the color gamut of the analog value should be 106.68%.
3 calculating the simulated spectrum conforming to the target brightness and color gamut
According to the adjustment method (complex calculation process is omitted here), the quantum dot parameters of ar=0.18, er=619 nm, fr=20 nm, qys (R) =0.5, ag=0.2519, eg=535nm, fg=20 nm and qys (G) =50% are finally selected, so that the simulated spectrum can reach the target requirement. Wherein the target white chromaticity coordinates were (0.2993,0.3227), the simulated luminous flux was 0.3227, and the color gamut was 107.55%.
4, the optical parameters Ar, er, fr, ag, eg, fg meeting the requirements are recorded, the peak wavelength and half-peak width of the quantum dots are selected through Er, fr, eg, fg, and the ratio of the peak energy of Ar to Ag is selected through the ratio of the Optical Densities (OD) of the red quantum dots and the green quantum dots.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A quantum dot formulation method, the method comprising:
a step of acquiring target parameters, in which a target white-field chromaticity coordinate (x, y) is acquired, the ratio of the target white-field chromaticity coordinate x to the target white-field chromaticity coordinate y is calculated, and the acquired ratio result is V; acquiring target brightness L and target color gamut area ratio P;
a simulation step, namely determining initial half peak widths and initial peak wavelengths corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances respectively, and assuming that the initial peak energies of the spectrums corresponding to the red quantum dots, the green quantum dots and the blue luminescent substances are respectively specific values, and simulating the spectrums by using a Gaussian function to obtain initial white light simulation spectrums;
a step of obtaining simulation parameters, in which a color tristimulus value is calculated according to the initial white light simulation spectrum, white color coordinates (x 1, Y1) are obtained through calculation, luminous flux Y and RGB chromaticity coordinates are obtained through calculation, a simulation brightness value L1 is obtained through calculation, wherein L1=mY is calculated, a triangle is constructed by taking the RGB chromaticity coordinates as vertexes, the area S1 of the triangle is calculated, the area S1 is compared with a triangle area S2 corresponding to a color gamut standard, the simulated color gamut area ratio P1 is obtained, m is larger than 0, and m is a value obtained through actual measurement;
the first adjustment step, calculating the ratio of x1 to y1 in the simulated white field chromaticity coordinates, wherein the obtained ratio result is V1; calculating a first difference between V and V1, and if the first difference is between a and b, performing a second adjustment step; if the first difference value is larger than b or smaller than a, directly returning to the simulation step, and only adjusting the peak value energy of any first color in the RGB three colors according to a first adjustment rule, and keeping other parameters unchanged; under the first regulation rule, acquiring an adjustable range of peak energy of the first color spectrum, wherein a is smaller than b, and the absolute values of a and b are taken from any one value of 0-0.005;
the first adjustment rule is: if the first difference is greater than b, adjusting the peak energy of the first color spectrum, and repeating the step of obtaining the simulation parameters and the first adjustment step at least once, so that the adjusted first difference is between a and b; if the first difference is smaller than a, reducing the spectrum peak energy of the first color, and repeating the step of obtaining the simulation parameters and the first adjustment step at least once, so that the adjusted first difference is between a and b;
the second adjustment step adjusts or does not adjust the peak energy of the second color spectrum so that the second difference between x of the target white chromaticity coordinate and the analog white chromaticity coordinate x1 is between a and b, and the third difference between y of the target white chromaticity coordinate and the analog white chromaticity coordinate y1 is between a and b, and fine-adjusts the peak energy of the first color spectrum in the adjustable range, and the first difference is between a and b;
a third adjustment step of comparing the magnitudes of the target luminance L and the analog luminance value L1, and comparing the magnitudes of the target color gamut area ratio P and the analog color gamut area ratio P1; if the simulated brightness value L1 is greater than or equal to the target brightness L and the simulated color gamut area ratio P1 is greater than or equal to the target color gamut area ratio P, not adjusting, otherwise adjusting according to a second adjustment rule; the step of adjusting according to the second adjustment rule comprises the steps of returning to the simulation step, adjusting at least one parameter of the peak wavelength of the red quantum dot, the half-peak width of the red quantum dot, the peak wavelength of the green quantum dot and the half-peak width of the green quantum dot, utilizing a Gaussian function to simulate the spectrum to obtain an adjusted white light simulated spectrum combination, calculating adjusted L1 'and P1' of the adjusted white light simulated spectrum combination according to the method of obtaining the simulated parameter step, and repeating the third adjustment step for adjustment until the adjusted L1 'and P1' respectively meet the target brightness L and the target color gamut area ratio P, and stopping adjustment;
recording, namely recording the peak wavelength of the corresponding red quantum dot, the half-peak width of the red quantum dot and the peak energy of the spectrum of the red quantum dot when the target requirement is met, and the peak wavelength of the green quantum dot, the half-peak width of the green quantum dot and the peak energy of the spectrum of the green quantum dot.
2. The quantum dot matching method according to claim 1, wherein the display device has a color filter, and in the step of obtaining the analog parameters, spectrum information of the color filter is obtained, and the spectrum information is combined with the initial white light analog spectrum to calculate a color tristimulus value, and further calculate chromaticity coordinates (x 1, y 1) of a white field; and calculating chromaticity coordinates of the luminous flux Y and the RGB three colors after passing through the color filter, thereby calculating the analog luminance value L1.
3. The quantum dot matching method according to claim 1, wherein the second adjustment rule is: the peak wavelength of the red quantum dot is increased, so that the analog brightness value L1' can be reduced, the NTSC-1931 color gamut area ratio is increased, and the DCI-P3-1976 color gamut area ratio is increased; the peak wavelength of the red quantum dot is reduced, so that the analog brightness value L1' can be increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is reduced; the peak wavelength of the green quantum dot is increased, so that the analog brightness value L1 is increased, the NTSC-1931 color gamut area ratio is reduced, and the DCI-P3-1976 color gamut area ratio is increased; the reduction of the peak wavelength of the green quantum dot can reduce the analog luminance value L1', the increase of the NTSC-1931 color gamut area ratio, and the decrease of the DCI-P3-1976 color gamut area ratio.
4. The quantum dot matching method according to claim 1, wherein the simulated brightness corresponding to the target requirement is at least 105% of the target brightness, and the simulated color gamut area ratio corresponding to the target requirement is at least 2% higher than the target color gamut area ratio.
5. The quantum dot matching method according to claim 4, wherein the simulated brightness corresponding to the target requirement is at least 110% of the target brightness, and the simulated color gamut area ratio corresponding to the target requirement is at least 4% higher than the target color gamut area ratio.
6. The quantum dot matching method according to claim 1, wherein the blue luminescent material is an LED, or an OLED, or a QLED, or a micro-LED.
7. The quantum dot matching method according to claim 1, wherein in the simulating step, a peak wavelength of the blue light-emitting substance is selected to be 447 to 453nm or 470nm, and a half-width of the blue light-emitting substance is selected to be 20nm±2nm.
8. The quantum dot matching method according to claim 1, wherein a= -0.001 and b = 0.001.
9. The quantum dot matching method according to any one of claims 1 to 8, wherein in the simulating step, simulating a spectrum using a gaussian function comprises fitting in combination with the quantum yield of the red quantum dot, the quantum yield of the green quantum dot, and the photon utilization of the blue illuminant, to obtain an initial white light simulated spectrum.
10. The preparation method of the photoluminescence component comprises red quantum dots and green quantum dots, and is characterized in that half-peak widths of the red quantum dots and the green quantum dots, and luminescence peak wavelength and proportion information of the red quantum dots and the green quantum dots are obtained according to any one quantum dot matching method of claims 1-9.
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