CN108984935B - Design method for wide color gamut and high light efficiency spectrum - Google Patents
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Abstract
The invention relates to a design method of a wide color gamut and a high light efficiency spectrum. Searching a group of spectrum combinations with optimal efficiency according to the transmittance of a color filter film in the liquid crystal display device, calculating the visual brightness and the spectral efficiency of each group of spectrum combinations through the visual efficiency, calculating the color gamut area according to the spectrum of each group of combinations, and finally comparing and selecting the optimal spectrum combinations. The method can be applied to the backlight source spectrum design and the illumination spectrum design of the liquid crystal display to improve the color gamut range and the efficiency of the liquid crystal display or the illumination equipment.
Description
Technical Field
The invention relates to a design method of a wide color gamut and a high light efficiency spectrum.
Background
The application of colorization techniques using a color conversion method to liquid crystal displays, organic EL displays, electrowetting display techniques, lighting, and the like has been widely studied. Color conversion is the down-conversion of light emitted from a light source into light of a longer wavelength, and means, for example, the down-conversion of a blue light source of a shorter wavelength into a green or red light emitting source. By forming a film from the composition having the color conversion function and combining the film with, for example, a blue light source, it is possible to simultaneously output three primary colors of blue, green, and red, that is, to output white light, from a single blue light source through the conversion film. A full-color display can be manufactured by using a white light source obtained by combining the blue light source and the film having a color conversion function as a light source unit, and combining the light source unit with a liquid crystal driving section and a color filter film. Further, if there is no liquid crystal driving portion, the liquid crystal display device can be used as a white light source as it is, and can be used as a white light source for LED lighting or the like, for example.
The light source of the backlight has evolved from the Cold Cathode Fluorescent Lamp (CCFL) over the last twenty years to phosphor converted white light diodes (1 pc-WLED). A1 pc-WLED uses a blue LED to excite a YAG: ce3+ yellow phosphor to produce white light. The significant advantages of 1pc-WLED are long life, low cost and easy assembly. Nevertheless, its broad yellow spectrum results in a narrow color gamut, which is only 75% NTSC in the International Commission on illumination (CIE) 1931 color space, and its maximum Transmission Efficiency (TE) is 8.7%. To increase the color gamut area, quantum dots have been applied in backlights in the form of Quantum Dot Enhancement Films (QDEF). Its total color gamut can reach 115% NTSC in the CIE1931 color space, but its maximum TE still stays around 9.7%, which is comparable to the efficiency of a backlight constructed with 1 p-WLED.
The invention patent application CN108141939A discloses a color conversion film, and a light source unit, a display, and a lighting device including the same, where the color conversion film only states that the color conversion film is composed of two layers, one layer is a color conversion layer of an organic light emitting material, and the other layer is a transparent resin having a certain oxygen permeability, and does not state the selection of key technical parameters of the color conversion film, for example, it does not state what ranges of spectral distributions of green and red colors converted are appropriate, nor does it state information such as an arrangement structure in the color conversion layer.
The invention patent application CN107922835A discloses a color conversion composition, a color conversion film, and a backlight unit, a display, and a lighting device including the same, and the invention patent application CN107709516A discloses a color conversion composition, a color conversion film, and a light emitting device, a liquid crystal display device, and a lighting device including the color conversion film, where the color conversion composition described in the two patent applications describes the emission wavelength ranges of green and red light emitting materials, but does not describe how to specifically select and select a method, and therefore, a spectral combination scheme matching the high efficiency and wide color gamut of a color filter film in a liquid crystal module cannot be quickly selected according to the method.
The patent application CN104763949A discloses a backlight module and a display device, wherein the backlight module comprises a light guide plate, a monochromatic light source on the light incident side of the light guide plate, a grating on the light emergent surface of the light guide plate, and a quantum dot plate on the light emergent surface of the light guide plate, wherein the quantum dot plate converts the diffracted monochromatic light into white light. The light guide plate, the grating and the quantum dot plate are mechanically combined layer by layer, so that the assembly is troublesome, a large-area grating and a large-area quantum dot plate film are needed, and the cost is high.
Utility model CN205404872U discloses a grating type light guide plate based on quantum dot, backlight unit need change the traditional module structure of principle, replaces a neotype light guide plate, and this scheme is unfavorable for popularizing and applying on current module.
The invention aims to optimally select the spectral distribution ranges of three primary colors by matching the spectral transmittance of the existing color filter film, obtain a spectral combination scheme with optimal efficiency and color gamut by theoretical calculation, and realize the design of the high-light efficiency and wide-color gamut spectral method by utilizing the advantages of narrow half-peak width and adjustable central wavelength of the existing quantum dot light emission spectrum.
Disclosure of Invention
The invention aims to provide a design method of wide color gamut and high light efficiency spectrum, which can be applied to the backlight source spectrum design and the illumination spectrum design of a liquid crystal display to improve the color gamut range and the efficiency of the liquid crystal display or an illumination device.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for designing a wide color gamut and a high light efficiency spectrum comprises the following steps:
s1, selecting a light source spectrum matched with the spectral transmittance of a color filter film according to the spectral transmittance of blue, green and red light conversion areas in the color filter film in a liquid crystal display device to obtain a plurality of groups of spectral data, and calculating the spectral distribution data of each group of spectra by adopting the following quantum dot spectral Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λ c ) 2 /(Δλ) 2 ] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λ c Represents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each group of spectral distribution data obtained in the step S1 into corresponding color coordinates respectively, wherein a calculation formula is as follows:
wherein S (lambda) is the emission spectrum of the backlight, X, Y and Z are the tristimulus values of the backlight,
the tristimulus values of the spectrum of a CIE1931 standard chromaticity observer are shown, and x, y and z are called the color coordinates of the CIE1931 chromaticity system;
then, the color gamut corresponding to each group of spectra is calculated according to the formula (4):
in the formula, S rgb Representing the area of the color gamut triangle, x r And y r Is the color coordinate, x, of the red primary color g And y g Is the color coordinate of the green primary color, x b And y b Is the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, A display : denotes the color gamut area of the display device, A standard : an area representing a standard color gamut;
s3, calculating the light energy proportion of the three primary color spectrums according to the color temperature requirement of white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, wherein the specific steps are as follows:
and solving the respective luminous intensity proportion of the three primary color spectrums according to the target color temperature and the coordinate values of the three primary color spectrums, wherein the calculation formula is as follows:
in the formula (x) w ，y w ，z w ) Is the color coordinate of a known standard white light source, (x) i ，y i ，z i I = r, g, b) are the color coordinates of the three color components red, green, blue, respectively, (f) i I = r, g, b) are the proportions of the three color components red, green, blue, respectively;
then, the radiance efficiency of each set of spectra under a known standard white light source is calculated according to equation (6):
where LER is the radiant luminance efficiency, P out (λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while K m Under the condition of photopic vision, under the condition of an ideal monochromatic 555nm light source, the LER value is 6831m/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, P out (λ) is the power spectral density of the light source for the total output light, P in (λ) is the power spectral density of the light source of the total input light;
the total light energy conversion efficiency per set of spectra can be calculated using the following equation:
TLE＝LER·TE (8)
where TLE is the total spectral efficiency of light energy conversion;
and S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each group of spectra as design spectral data of the color conversion film, and selecting a proper material as a light conversion material of the color conversion film according to the spectral data.
In an embodiment of the invention, in the step S1, a light source spectrum matched with the spectral transmittance of the color filter is selected, that is, the peak center wavelength of the selected light source spectrum falls within a wavelength range corresponding to the spectral maximum transmittance of the color filter.
In an embodiment of the present invention, in the step S4, a combination with the best color gamut and light energy conversion efficiency is selected from each set of spectra, that is, an optimal combination with the highest color gamut and the highest light energy conversion efficiency or both is selected according to actual applications.
In one embodiment of the present invention, the red, green and blue light conversion regions are periodically arranged on the color conversion film and are spaced by black barriers, and the size of the cells and the size of the barriers between the cells of each light conversion region are consistent with the size of the light-transmitting portion and the size of the barriers of the color filter film of the liquid crystal display correspondingly used.
In an embodiment of the present invention, the upper and lower protection layers of the light conversion material of the color conversion film are made of a transparent material, PET or optical grade PMMA, and have a thickness ranging from 0.05mm to 0.5 mm.
In an embodiment of the present invention, the light source incident on the color conversion film is collimated uv light, wherein the uv light peak center wavelength range is from 325nm to 390nm, and the full width at half maximum of the spectrum is 20nm and less, and the emission spectrum peak center wavelength ranges of blue, green and red on the color conversion film are respectively: lambda is less than 445nm b ＜460nm、510nm＜λ g ＜555nm、630nm＜λ r Less than 685nm, and the full width at half maximum of its luminous spectrum is 30nm or less.
In one embodiment of the present invention, the light source incident on the color conversion film is collimated blue light with a blue light peak centerWavelength range from 445nm to 460nm, and spectrum full width at half maximum of 20nm or less, and peak center wavelengths of green and red emission spectra on the color conversion film are 510nm < lambda g ＜555nm、630nm＜λ r Less than 685nm, and a half-height width of the emission spectrum of 30nm or less.
In one embodiment of the present invention, after the ultraviolet collimated light source passes through the color conversion film, the excess ultraviolet light is filtered by the color filter.
In an embodiment of the present invention, after the blue collimated light source passes through the color conversion film, the excessive blue light transmitted in the green and red light conversion regions is filtered by the green and red pixel regions corresponding to the color filter film.
In an embodiment of the present invention, the method is applied to the backlight spectrum design and the illumination spectrum design of the liquid crystal display.
Compared with the prior art, the invention has the following beneficial effects: the method can be applied to the backlight source spectrum design and the illumination spectrum design of the liquid crystal display to improve the color gamut range and the efficiency of the liquid crystal display or the illumination equipment.
Drawings
Fig. 1 is a structural view of an intermediate layer of a color conversion film.
Fig. 2 is a structural view of a color conversion film.
FIG. 3 is a graph of transmittance of a color filter.
FIG. 4 is a schematic view of a liquid crystal display module with a color conversion film.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides a design method of a wide color gamut and a high light efficiency spectrum, which comprises the following steps:
s1, selecting a light source spectrum matched with the spectral transmittance of a color filter film according to the spectral transmittance of blue, green and red light conversion areas in the color filter film in a liquid crystal display device to obtain a plurality of groups of spectral data, and calculating the spectral distribution data of each group of spectra by adopting the following quantum dot spectral Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λ c ) 2 /(Δλ) 2 ] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λ c Represents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each group of spectral distribution data obtained in the step S1 into corresponding color coordinates respectively, wherein a calculation formula is as follows:
wherein S (lambda) is the emission spectrum of the backlight, X, Y, and Z are tristimulus values of the backlight,
the tristimulus values of the spectrum of a CIE1931 standard chromaticity observer are shown, and x, y and z are called the color coordinates of the CIE1931 chromaticity system;
then, the color gamut corresponding to each group of spectra is calculated according to the formula (4):
in the formula, S rgb Representing the area, x, of the gamut triangle r And y r Is the color coordinate of the red primary color, x g And y g Is the color coordinate of the primary color green, x b And y b Is the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, A display : denotes the color gamut area of the display device, A standard : an area representing a standard color gamut;
s3, calculating the light energy proportion of the three primary color spectrums according to the color temperature requirement of white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, wherein the specific steps are as follows:
and solving the respective luminous intensity proportion of the three primary color spectrums according to the target color temperature and the coordinate values of the three primary color spectrums, wherein the calculation formula is as follows:
in the formula (x) w ，y w ，z w ) Is the color coordinate of a known standard white light source, (x) i ，y i ，z i I = r, g, b) are the color coordinates of the three color components red, green, blue, respectively, (f) i I = r, g, b) are the proportions of the three color components red, green, blue, respectively;
then, the radiance efficiency of each set of spectra under a known standard white light source is calculated according to equation (6):
where LER is the radiant luminance efficiency, P out (λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while K m Under the condition of photopic vision, under the condition of an ideal monochromatic 555nm light source, the LER value is 6831m/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, P out (λ) is the power spectral density of the light source for the total output light, P in (λ) is the power spectral density of the light source of the total input light;
the total light energy conversion efficiency per set of spectra can be calculated using the following equation:
TLE＝LER·TE (8)
where TLE is the total spectral efficiency of light energy conversion;
and S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each group of spectra as design spectral data of the color conversion film, and selecting a proper material as a light conversion material of the color conversion film according to the spectral data.
In step S1, a light source spectrum matched with the spectral transmittance of the color filter is selected, that is, the peak center wavelength of the selected light source spectrum falls within the wavelength range corresponding to the spectral maximum transmittance of the color filter.
In step S4, the combination with the best color gamut and light energy conversion efficiency is selected from each group of spectra, that is, the optimal combination with the highest color gamut and the highest light energy conversion efficiency or both is selected according to the actual application.
The red, green and blue light conversion regions are periodically arranged on the color conversion film with a black barrier therebetween, and the size of the lattice of each light conversion region and the size of the barrier between the lattices are kept consistent with the size of the light-transmitting portion and the size of the barrier of the color filter of the correspondingly used liquid crystal display.
The upper and lower protective layers of the light conversion material of the color conversion film are made of a transparent material PET or optical grade PMMA, and the thickness of the upper and lower protective layers ranges from 0.05mm to 0.5 mm.
The light source incident on the color conversion film is collimated ultraviolet light, wherein the central wavelength range of the peak value of the ultraviolet light is from 325nm to 390nm, the full width at half maximum of the spectrum is 20nm and below, and the central wavelength ranges of the peak values of the emission spectra of blue, green and red on the color conversion film are respectively as follows: lambda is less than 445nm b ＜460nm、510nm＜λ g ＜555nm、630nm＜λ r Less than 685nm, and the full width at half maximum of its luminous spectrum is 30nm or less. After the ultraviolet collimation light source passes through the color conversion film, the redundant ultraviolet light is filtered by the color filter film.
The light source incident on the color conversion film is collimated blue light having a blue light peak center wavelength ranging from 445nm to 460nm and a spectral full width at half maximum of 20nm or lessThe central wavelengths of the peak values of the luminescence spectra are respectively more than 510nm and less than lambda g ＜555nm、630nm＜λ r Less than 685nm, and a half-height width of the emission spectrum of 30nm or less. After the blue collimated light source passes through the color conversion film, the excessive blue light transmitted in the green and red light conversion regions is filtered by the green and red pixel regions corresponding to the color filter film
The method is applied to the backlight source spectrum design and the illumination spectrum design of the liquid crystal display.
The invention is realized as follows.
A method for designing a wide color gamut and a high light efficiency spectrum comprises the following design steps:
step S11, selecting a matching spectrum according to the spectral transmittances of blue, green and red areas in a color filter film in the liquid crystal display device as shown in FIG. 3, wherein the peak value of blue light is 447nm at the central wavelength, the peak value of green light is 525nm,535nm and 545nm, the peak value central wavelength of red light is 635nm,645nm and 655nm. Meanwhile, the full width half maximum wave of the blue light is 20nm, and the full width half maximum wave of the green light and the red light is 30nm; the 9 groups of spectral data are shown in table 1, and the adopted quantum dot spectral gaussian fitting function is as follows:
S(λ)＝A·exp[-2.773(λ-λ c ) 2 /(Δλ) 2 ] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λ c Represents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
TABLE 1 concrete parameters of the protocols
By substituting the data in table 1 into the above formula, the spectral distribution data of 9 sets of spectra can be calculated, respectively.
Step S12, respectively converting the 9 groups of spectral distribution data into corresponding color coordinates, wherein the calculation method adopts the following formula:
wherein S (lambda) is the data function of the emission spectrum distribution of the backlight source, X, Y and Z are the tristimulus values of the spectrum of the backlight source,
is CIE1931 standard chromaticity observer spectrum tristimulus value curve, x, y and z are color coordinates of CIE1931 chromaticity system;
the color coordinate values of the 9 sets of data obtained by substituting the spectral data calculated in step S11 into the above formula are shown in table 2.
Then, according to the formula:
in the formula, S rgb Representing the area, x, of the gamut triangle r And y r Is the color coordinate of the red primary color, x g And y g Is the color coordinate of the primary color green, x b And y b Is the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, A display : denotes the color gamut area of the display device, A standard : an area representing a standard color gamut;
the color gamut corresponding to 9 groups of red, green and blue spectra are calculated respectively and shown in table 2;
table 2 calculated color coordinates and corresponding color gamuts for 9 combinations
Step S13, calculating the light energy proportion of the three primary color spectrums according to the color temperature requirement of white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, wherein the specific steps are as follows:
and solving the respective luminous intensity proportion of the three primary color spectrums according to the target color temperature and the three primary color coordinates, wherein the calculation formula is as follows:
in the formula (x) w ，y w ，z w ) Is the color coordinate of a known standard white light source, (x) i ，y i ，z i I = r, g, b) are the color coordinates of the three color components red, green, blue, respectively, (f) i I = r, g, b) are the proportions of the three color components red, green, blue, respectively;
then, the radiance efficiency of each set of spectrum under the target light source of D65 white light source is calculated according to the formula (6):
where LER is the radiant luminance efficiency, P out (λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while K m Under photopic vision conditions, under the condition of an ideal monochromatic 555nm light source, the LER value is 6831m/W;
from the above formula, the radiance efficiency of each set of spectra in the case of the D65 white light source standard can be calculated as shown in table 3.
TABLE 3 tricolor ratio, light efficiency and maximum efficiency values for 9 QD schemes
The light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, P out (λ) is the power spectral density, P, of the light source for the total output light in (λ) is the power spectral density of the light source of the total input light; the respective light energy conversion efficiency of each group of spectra under the condition of D65 white light source standard can be calculated according to the formula, meanwhile, according to the characteristics of the liquid crystal display device, the optimal value of the transmittance of the polarizer is assumed to be 0.4 for convenience of calculation, the optimal value of the liquid crystal transmittance is assumed to be 0.95, and the transmittances of blue light, green light and red light which are transmitted through the color filter film are respectively approximately 0.8,0.85 and 0.9 according to the transmittance curve of the color filter film shown in figure 3; the maximum TE values obtained from the calculation results are shown in table 3.
The total light energy conversion efficiency per set of spectra can be calculated using the following equation:
TLE＝LER·TE (8)
the total conversion efficiency TLE of each spectrum in the case of the D65 white light source standard for each set of spectrum can be calculated according to the above formula as shown in table 3.
And S14, selecting the combination with the best color gamut and efficiency from the color conversion film as the design spectrum data of the color conversion film, and selecting a proper material as the light conversion material of the color conversion film according to the spectrum data.
From table 2, three combinations with the maximum color gamut are selected, which are QD1, QD4 and QD7, respectively, and the corresponding total efficiencies are 77.41m/W,71.9lm/W and 68.01m/W, respectively, so that QD1 can be selected as the best choice among the 3 combinations with the maximum color gamut according to the design requirements, for example, with efficiency priority. In the case of the color filter transmittance curve shown in fig. 3, the optimum scheme obtained by the above steps is a scheme in which the color gamut is 132.9% ntsc (CIE 1931) and the maximum transmission efficiency is 32.4%, and the parameters of the combination scheme are 447nm,523.5nm,635nm for the blue, green and red central wavelengths, and 20nm, 30nm and 30nm for the full width at half maximum, respectively; the ratio of their spectral intensities was calculated by simulation as: 0.4002:0.3017: at 0.2981, a D65 standard light source can be mixed.
The following are specific examples of the present invention.
FIGS. 1-3 illustrate the following:
fig. 1 is a structure diagram of an intermediate layer of a color conversion film, in fig. 1, 101 is a black barrier, 102 is a red quantum dot material, 103 is a green quantum dot material, and 104 is a transparent material or a blue quantum dot material, the quantum dot materials are quantum dots, a dispersing agent and a polymer, and the quantum dots account for 3.3 to 7.8 percent of the total mass, the solvent accounts for 50.4 to 78.1 percent of the total mass, and the polymer accounts for 18.1 to 47.3 percent of the total mass according to the mass ratio.
FIG. 2 is a view showing the structure of a color conversion film, and 10 in FIG. 2 is an intermediate layer; 11 is the upper strata, and 12 is the lower floor, and upper and lower floor's main part is transparent organic glass, plays the effect that the protection intermediate level quantum dot water proof separates oxygen.
Fig. 3 is a graph showing transmittance curves of three colors of red, green and blue of the color filter.
FIG. 4 shows a liquid crystal display module with a color conversion film, and FIG. 4 shows a color conversion film 1; 2 is a light source, blue light or ultraviolet light; 3 is a collimation backlight source; 4 is a polarizer; 5 is liquid crystal and TFT;6 is a color filter film; and 7, a polarization analyzer.
In example 1 of the present invention: the lattice on the intermediate layer (10) of the color conversion layer of fig. 1 is a set of periodically repeated arrangement of transparent regions (104) capable of transmitting blue light and two regions embedded or coated with light capable of emitting primary colors of green (103) and red (102), and they are separated by a black barrier (101). The blue light-permeable region of the intermediate layer is a transparent filler such as a PET material or an optical grade PMMA material, the green and red primary color-emitting region is embedded or coated with a quantum dot fluorescent material, wherein the green region is a green quantum dot and the red region is a red quantum dot.
The quantum dots are red quantum dots (102) and green quantum dots (103), and comprise CdSe/ZnS, inP/ZnS, pbse/PbS, cdSe/CdS, cdTe/CdS or CdTe/ZnS, and the sizes of the quantum dots are distributed from 1nm to 10nm; the emission peak wavelength of the green quantum dots is 510-555 nm; the emission peak wavelength of the red quantum dots is 635-685 nm; the full width at half maximum of the emission spectrum is 30nm or less.
In example 2 of the present invention: the grids on the middle layer (10) of the color conversion layer as shown in fig. 1 are arranged in a repeating manner by embedding or coating three areas capable of emitting primary colors of blue (104), green (103) and red (102) as a group, and are separated by a black barrier (101). And three areas capable of emitting primary color light on the intermediate layer, wherein the embedded or coated materials are quantum dot fluorescent materials, wherein the blue areas are blue quantum dots, the green areas are green quantum dots, and the red areas are red quantum dots.
The quantum dots are blue quantum dots (104), red quantum dots (102) and green quantum dots (103), and comprise CdSe/ZnS, inP/ZnS, pbse/PbS, cdSe/CdS, cdTe/CdS or CdTe/ZnS, and the size distribution of the quantum dots is 1nm to 10nm; the emission peak wavelength of the blue quantum dots is 445nm to 460nm, and the full width at half maximum of the emission spectrum is 20nm or less; the emission peak wavelength of the green quantum dots is 510-555 nm; the emission peak wavelength of the red quantum dots is 630-685 nm; the full width at half maximum of the emission spectrum is 30nm or less.
The above are preferred embodiments of the present invention, and all changes made according to the technical solutions of the present invention that produce functional effects do not exceed the scope of the technical solutions of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A method for designing a wide color gamut and a high light efficiency spectrum is characterized by comprising the following steps:
s1, selecting a light source spectrum matched with the spectral transmittance of a color filter film according to the spectral transmittance of blue, green and red light conversion areas in the color filter film in a liquid crystal display device to obtain a plurality of groups of spectral data, and calculating the spectral distribution data of each group of spectra by adopting the following quantum dot spectral Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λ c ) 2 /(Δλ) 2 ] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λ c Indicating the center wavelength of the spectrumΔ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each group of spectral distribution data obtained in the step S1 into corresponding color coordinates respectively, wherein a calculation formula is as follows:
wherein S (lambda) is the emission spectrum of the backlight, X, Y and Z are the tristimulus values of the backlight,
the tristimulus values of the spectrum of a CIE1931 standard chromaticity observer are shown, and x, y and z are called the color coordinates of the CIE1931 chromaticity system;
then, the color gamut corresponding to each group of spectra is calculated according to the formula (4):
in the formula, S rgb Representing the area, x, of the gamut triangle r And y r Is the color coordinate of the red primary color, x g And y g Is the color coordinate of the primary color green, x b And y b Is the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, A display : denotes the color gamut area of the display device, A standard An area representing a standard color gamut;
s3, calculating the light energy proportion of the three primary color spectrums according to the color temperature requirement of white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, wherein the specific steps are as follows:
and solving the respective luminous intensity proportion of the three primary color spectrums according to the target color temperature and the coordinate values of the three primary color spectrums, wherein the calculation formula is as follows:
wherein (x) w ，y w ，z w ) Is the color coordinate of a known standard white light source, (x) i ，y i ，z i I = r, g, b) are the color coordinates of the three color components red, green, blue, respectively, (f) i I = r, g, b) are the proportions of the three color components red, green, blue, respectively;
then, the radiance efficiency of each set of spectra under a known standard white light source is calculated according to equation (6):
where LER is the radiant luminance efficiency, P out (λ) is the power spectral density of the source of total output light, V (λ) is the standard luminosity function, while satisfying the LER value of equation (6) of 683lm/W in the case of a photopic condition and an ideal monochromatic 555nm source
The light energy conversion efficiency of each set of spectra is expressed by the following equation:
in the formula, P out (λ) is the power spectral density of the light source for the total output light, P in (λ) is the power spectral density of the light source of the total input light;
the total light energy conversion efficiency for each set of spectra is calculated using the following equation:
TLE＝LER·TE (8)
where TLE is the total spectral efficiency of light energy conversion;
and S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each group of spectra as design spectral data of the color conversion film, and selecting a proper material as a light conversion material of the color conversion film according to the spectral data.
2. The method as claimed in claim 1, wherein in step S1, the light source spectrum is selected to match the spectral transmittance of the color filter, i.e. the peak center wavelength of the selected light source spectrum falls within the wavelength range corresponding to the maximum spectral transmittance of the color filter.
3. The method as claimed in claim 1, wherein in step S4, the optimal combination of color gamut and light energy conversion efficiency is selected from each set of spectra, that is, the optimal combination of color gamut being the highest, light energy conversion efficiency being the highest or both is selected according to the actual application.
4. The method as claimed in claim 1, wherein the red, green and blue light conversion regions are periodically arranged on the color conversion film and are separated by black barrier ribs, and the size of the cells and the size of the barrier ribs between the cells of each light conversion region are consistent with the size of the light-transmitting portions and the size of the barrier ribs of the color filter film of the LCD.
5. The method as claimed in claim 1, wherein the upper and lower protective layers of the light conversion material of the color conversion film are made of a transparent material such as PET or optical PMMA, and have a thickness ranging from 0.05mm to 0.5 mm.
6. The method as claimed in claim 1, wherein the light source incident on the color conversion film is collimated UV light with a central wavelength of the UV peak ranging from 325nm to 390nm and a full width at half maximum of 20nm, and blue color on the color conversion film is blueThe central wavelength ranges of the green and red luminescence spectrum peak values are respectively as follows: 445nm & lt lambda b ＜460nm、510nm＜λ g ＜555nm、630nm＜λ r Less than 685nm, and has a full width at half maximum of 30nm or less.
7. The method as claimed in claim 1, wherein the light source incident on the color conversion film is collimated blue light with a peak center wavelength of the blue light ranging from 445nm to 460nm and a full width at half maximum of 20nm or less, and the peak center wavelengths of the green and red emission spectra on the color conversion film are 510nm < λ, respectively g ＜555nm、630nm＜λ r Less than 685nm, and a half-height width of the emission spectrum of 30nm or less.
8. The method as claimed in claim 6, wherein the ultraviolet collimated light source passes through the color conversion film, and the excess ultraviolet light is filtered by the color filter.
9. The method as claimed in claim 7, wherein after the blue collimated light source passes through the color conversion film, the excessive blue light transmitted in the green and red light conversion regions is filtered by the green and red pixel regions corresponding to the color filter film.
10. The method as claimed in claim 1, wherein the method is applied to the design of backlight spectrum and illumination spectrum of liquid crystal display.
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