CN108897170B - Color conversion film and liquid crystal module comprising same - Google Patents
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- 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
- 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
- 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
- G02F1/133624—Illuminating devices characterised by their spectral emissions
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Abstract
Description
Technical Field
The invention relates to a color conversion film and a liquid crystal module formed by the same.
Background
The application of colorization techniques using a color conversion method to liquid crystal displays, organic EL displays, liquid phase display techniques, illumination, and the like is being 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 CIE1931 color space, but its maximum TE still stays around 9.7%, which is equivalent to the efficiency of 1p-WLED backlight.
The invention patent application CN108141939A discloses a color conversion film, and a light source unit, a display and a lighting device containing the same, wherein the color conversion film only describes that the color conversion film is composed of two layers, one layer is a color conversion layer of an organic luminescent material, the other layer is a transparent resin with a certain oxygen permeability, and no description is made on the selection of key technical parameters of the color conversion film, for example, it does not describe what range of the converted green and red spectral distributions are appropriate, and no information such as the arrangement structure in the color conversion layer is indicated.
The invention patent application CN107922835A discloses a color conversion composition, a color conversion film, and a backlight unit, a display and a lighting device comprising the same, and the invention patent application CN107709516A discloses a color conversion composition, a color conversion film, and a lighting device, a liquid crystal display device and a lighting device comprising the color conversion film, wherein the color conversion composition described in the two patent applications describes the light emission wavelength ranges of green and red light emitting materials, but does not describe how to select and select the specific method, so that a spectrum combination scheme matching the high efficiency and wide color gamut of the color filter film in the liquid crystal module cannot be quickly selected according to the method.
The invention patent application CN104763949A discloses a backlight module and a display device, wherein the backlight module comprises a light guide plate, a monochromatic light source at the light incident side of the light guide plate, a grating at the light emergent surface of the light guide plate, and a quantum dot plate at 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 patent CN205404872U discloses a grating type light guide plate based on quantum dot, backlight unit needs to 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 method adopted by the invention only needs to add a layer of color conversion film, does not need to change other optical components in the backlight module, and can quickly match the spectrum combination scheme of high efficiency and light color gamut by adopting the spectrum selection method, so the scheme is favorable for popularization and application on the existing module.
Disclosure of Invention
The invention aims to provide a color conversion film and a liquid crystal module formed by the same, and aims to improve the optical efficiency of a liquid crystal display device and increase the color gamut area.
In order to achieve the purpose, the technical scheme of the invention is as follows: a color conversion film comprises an intermediate layer, an upper layer and a lower layer, wherein the intermediate layer is tightly arranged with lattices, and the upper layer and the lower layer are respectively arranged on the upper part and the lower part of the intermediate layer and are respectively composed of transparent substrates with high transmittance; the grids of the intermediate layer are arranged in a periodic repeated mode by taking a grid of a transparent area capable of transmitting blue light, a grid of a blue light area embedded or coated with a blue light area capable of emitting blue primary light, a grid of a green light area embedded or coated with a green light area capable of emitting green primary light and a grid of a red light area embedded or coated with a red light area capable of emitting red primary light as a group, and the grids of the transparent area/the blue light area, the grids of the green light area and the grids of the red light area are separated by a black barrier.
In an embodiment of the present invention, the transparent filler of the lattice of the transparent area is a PET material or an optical grade PMMA material; the material embedded or coated in the grid of the blue light region, the grid of the green light region or the grid of the red light region is a quantum dot fluorescent material, wherein the blue light region is a blue quantum dot, the green light region is a green quantum dot, and the red light region is a red quantum dot.
In an embodiment of the present invention, the lower layer and the upper layer are both made of PET material or optical grade PMMA material, and the thickness range thereof is between 0.05mm and 0.5 mm; the thickness of the middle layer is between 1um and 10 um.
In an embodiment of the invention, the size of each grid and the size of the barrier between the grids on the intermediate layer are matched with the size of the light-transmitting part and the size of the barrier of the liquid crystal pixel and the color filter film of the correspondingly matched liquid crystal display.
The invention also provides a liquid crystal module formed on the basis of the color conversion film, wherein a backlight source of the liquid crystal module adopts blue light as a light source, the light source is uniformly collimated to obtain a uniform light source of a blue collimation plane, and the uniform light source respectively penetrates out the blue light, converts green light with the blue light and converts red light with the blue light through the color conversion film; wherein the lattices of the color conversion film intermediate layer are arranged in a repeating manner in which lattices in a transparent region, lattices in a green region, and lattices in a red region are periodically arranged in a pair.
The invention also provides a liquid crystal module formed based on the color conversion film, wherein the backlight source of the liquid crystal module adopts ultraviolet light as a light source, the light source is uniformly collimated to obtain an ultraviolet collimation plane uniform light source, and the ultraviolet collimation plane uniform light source is respectively converted into blue light with the ultraviolet light, green light with the ultraviolet light and red light with the ultraviolet light through the color conversion film; wherein the lattices of the color conversion film intermediate layer are arranged in a repeating manner in a periodic manner by a group of lattices in a blue light region, lattices in a green light region, and lattices in a red light region.
In an embodiment of the present invention, the color conversion film is made of a material selected by using a wide color gamut and high light efficiency spectrum calculation method to improve the color gamut range and efficiency of the liquid crystal display or the lighting device, and the specific wide color gamut and high light efficiency spectrum calculation method includes the following steps:
step S1, selecting a light source spectrum matched with the spectrum transmittance of a color filter film in the liquid crystal display device according to the spectrum transmittance of blue, green and red light regions of the color conversion film adopted in the liquid crystal display device, acquiring a plurality of groups of spectrum data, and calculating the spectrum distribution data of each group of spectra by adopting the following quantum dot spectrum Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λc)2/(Δλ)2] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λcRepresents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each set of spectral distribution data obtained in step S1 into corresponding color coordinates, respectively, the calculation formula is as follows:
where S (λ) is the emission spectrum of the backlight, X, Y, Z is the tristimulus value 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, SrgbRepresenting the area, x, of the gamut trianglerAnd yrIs the color coordinate of the red primary color, xgAnd ygIs the color coordinate of the primary color green, xbAnd ybIs the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, AdisplayDenotes the color gamut area of the display device, AstandardAn area representing a standard color gamut;
step S3, calculating the light energy ratio of the three primary color spectrums according to the color temperature requirement of the white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, which is specifically 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，yw，zw) Is the color coordinate of a known standard white light source, (x)i，yi，ziI ═ r, g, b) are the color coordinates of the red, green, blue three color components, respectively, (f)iI ═ r, g, b) are the proportions of the red, green, blue three color components, 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, Pout(λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while KmUnder the condition of photopic vision, under the condition of an ideal monochromatic 555nm light source, the LER value is 6831 m/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, Pout(λ) is the power spectral density of the light source for the total output light, Pin(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 step S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each set of spectra as design spectral data of the color conversion film, and selecting a suitable 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, the light source spectrum is selected to match the spectral transmittance of the color filter in the liquid crystal display device, 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 set of spectra, that is, the optimum combination with the highest color gamut and the highest light energy conversion efficiency or both is selected according to the actual application.
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 445nmb＜460nm、510nm＜λg＜555nm、630nm＜λrLess 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 incident light is incident on the color conversion filmThe light source of (2) is collimated blue light, the peak central wavelength of the blue light ranges from 445nm to 460nm, the full width at half maximum of the spectrum is 20nm or less, and the peak central wavelengths of the green and red luminescence spectra on the color conversion film are respectively 510nm < lambdag＜555nm、630nm＜λrLess than 685nm, and a half-height width of the emission spectrum of 30nm or less.
Compared with the prior art, the invention has the following beneficial effects: the invention can improve the optical efficiency of the liquid crystal display device and increase the color gamut area.
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 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 color conversion film, which comprises an intermediate layer, an upper layer and a lower layer, wherein the intermediate layer is tightly arranged with lattices, and the upper layer and the lower layer are respectively arranged on the upper part and the lower part of the intermediate layer and are respectively composed of transparent substrates with high transmittance; the grids of the intermediate layer are arranged in a periodic repeated mode by taking a grid of a transparent area capable of transmitting blue light, a grid of a blue light area embedded or coated with a blue light area capable of emitting blue primary light, a grid of a green light area embedded or coated with a green light area capable of emitting green primary light and a grid of a red light area embedded or coated with a red light area capable of emitting red primary light as a group, and the grids of the transparent area/the blue light area, the grids of the green light area and the grids of the red light area are separated by a black barrier.
The transparent filler of the lattice of the transparent area is a PET material or an optical PMMA material; the material embedded or coated in the grid of the blue light region, the grid of the green light region or the grid of the red light region is a quantum dot fluorescent material, wherein the blue light region is a blue quantum dot, the green light region is a green quantum dot, and the red light region is a red quantum dot.
The lower layer and the upper layer are both made of PET materials or optical PMMA materials, and the thickness range of the lower layer and the upper layer is 0.05mm to 0.5 mm; the thickness of the middle layer is between 1um and 10 um. The size of each grid and the size of the barrier between the grids on the middle layer are matched with the sizes of the light-transmitting parts and the barrier of the liquid crystal pixels and the color filter films of the liquid crystal display which are correspondingly matched.
The invention also provides a liquid crystal module formed on the basis of the color conversion film, wherein a backlight source of the liquid crystal module adopts blue light as a light source, the light source is uniformly collimated to obtain a uniform light source of a blue collimation plane, and the uniform light source respectively penetrates out the blue light, converts green light with the blue light and converts red light with the blue light through the color conversion film; wherein the lattices of the color conversion film intermediate layer are arranged in a repeating manner in which lattices in a transparent region, lattices in a green region, and lattices in a red region are periodically arranged in a pair.
The invention also provides a liquid crystal module formed based on the color conversion film, wherein the backlight source of the liquid crystal module adopts ultraviolet light as a light source, the light source is uniformly collimated to obtain an ultraviolet collimation plane uniform light source, and the ultraviolet collimation plane uniform light source is respectively converted into blue light with the ultraviolet light, green light with the ultraviolet light and red light with the ultraviolet light through the color conversion film; wherein the lattices of the color conversion film intermediate layer are arranged in a repeating manner in a periodic manner by a group of lattices in a blue light region, lattices in a green light region, and lattices in a red light region.
In the invention, the material of the color conversion film is selected by adopting a wide color gamut and high light efficiency spectrum calculation method to improve the color gamut range and efficiency of the liquid crystal display or the lighting equipment, and the specific wide color gamut and high light efficiency spectrum calculation method comprises the following steps:
step S1, selecting a light source spectrum matched with the spectrum transmittance of a color filter film in the liquid crystal display device according to the spectrum transmittance of blue, green and red light regions of the color conversion film adopted in the liquid crystal display device, acquiring a plurality of groups of spectrum data, and calculating the spectrum distribution data of each group of spectra by adopting the following quantum dot spectrum Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λc)2/(Δλ)2] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λcRepresents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each set of spectral distribution data obtained in step S1 into corresponding color coordinates, respectively, the calculation formula is as follows:
where S (λ) is the emission spectrum of the backlight, X, Y, Z is the tristimulus value 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, SrgbRepresenting the area, x, of the gamut trianglerAnd yrIs the color coordinate of the red primary color, xgAnd ygIs the color coordinate of the primary color green, xbAnd ybIs the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, AdisplayDenotes the color gamut area of the display device, AstandardAn area representing a standard color gamut;
step S3, calculating the light energy ratio of the three primary color spectrums according to the color temperature requirement of the white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, which is specifically 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，yw，zw) Is the color coordinate of a known standard white light source, (x)i，yi，ziI ═ r, g, b) are the color coordinates of the red, green, blue three color components, respectively, (f)iI ═ r, g, b) are the proportions of the red, green, blue three color components, 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, Pout(λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while KmUnder the condition of photopic vision, under the condition of an ideal monochromatic 555nm light source, the LER value is 683 lm/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, Pout(λ) is the power spectral density of the light source for the total output light, Pin(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 step S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each set of spectra as design spectral data of the color conversion film, and selecting a suitable 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, the light source spectrum is selected to match the spectral transmittance of the color filter in the liquid crystal display device, 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 set of spectra, that is, the optimum combination with the highest color gamut and the highest light energy conversion efficiency or both is selected according to the actual application.
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 445nmb＜460nm、510nm＜λg＜555nm、630nm＜λrLess 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 having a peak central wavelength of the blue light ranging from 445nm to 460nm and a full width at half maximum of 20nm or less, and the peak central wavelengths of the green and red emission spectra on the color conversion film are 510nm < λ, respectivelyg＜555nm、630nm＜λrLess than 685nm, and a half-height width of the emission spectrum of 30nm or less.
The following are specific embodiments of the present invention.
The invention designs a color conversion film, after uniformly collimating backlight passes through the color conversion film, the uniformly collimated backlight can be converted into red and green light with FWHM width less than 30nm and blue light with FWHM less than 20nm, and the peak center wavelength can be selected according to the requirements of color gamut and light efficiency; the color conversion region in the color conversion film is composed of a quantum dot material. The color conversion film has a three-layer structure in which the lower layer is composed of a transparent substrate having a high transmittance, the intermediate layer is composed of a periodically arranged lattice, and the upper layer is composed of a transparent substrate having a high transmittance. The size of each lattice on the intermediate layer and the size of the barrier ribs between the lattices are kept consistent with the size of the part of transmitted light and the barrier ribs of the color filter film of the liquid crystal display correspondingly employed. As shown in fig. 2, the lower layer and the upper layer are made of PET material or optical grade PMMA material, and the thickness range is 0.05mm to 0.5 m; the thickness of the middle layer is between 1um and 10 um.
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, 104 is a transparent material or a blue quantum dot material, the quantum dot materials are composed of quantum dots, a dispersant and a polymer, the quantum dots account for 3.3% to 7.8% of the total mass, the solvent accounts for 50.4% to 78.1% of the total mass, and the polymer accounts for 18.1% to 47.3% of the total mass according to 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 shows a liquid crystal display module with a color conversion film, and FIG. 3 shows acolor 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 areas on the intermediate layer are transparent fillers such as PET materials or optical grade PMMA materials, the green and red primary color-emitting areas are embedded or coated with quantum dot fluorescent materials, the green areas are green quantum dots, and the red areas are red quantum dots. As shown in fig. 3, the backlight source of the liquid crystal module adopts blue light as the light source (2), the color conversion film (1) is placed above the backlight source (3) after the blue light source is uniformly collimated, wherein the uniform light source of the blue collimation plane respectively penetrates through the blue light, converts the blue light into a green light source and converts the blue light into red light after passing through the color conversion film (1), and simultaneously the color conversion film is matched with the traditional color filter film (6) to filter out the unconverted blue light in the green and red areas in the color conversion film (1), thereby improving the color purity, the color gamut area and the light efficiency of the liquid crystal display device.
The quantum dots are red quantum dots (102) and green quantum dots (103), comprise CdSe/ZnS, InP/ZnS, Pbse/PbS, CdSe/CdS, CdTe/CdS or CdTe/ZnS, and have the size distribution of 1-10 nm; 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. As shown in fig. 3, the backlight source of the liquid crystal module adopts ultraviolet light as a light source, the color conversion film is placed above the backlight source (2) after the ultraviolet light source is uniformly collimated, wherein the ultraviolet collimation plane uniform light source respectively converts a blue light source with ultraviolet light, a green light source with ultraviolet light and red light with ultraviolet light after passing through the color conversion film (1), and simultaneously the color conversion film is matched with a traditional color filter film (6) to filter out the ultraviolet light which is not converted after passing through the color conversion film (1), thereby improving the color purity, the color gamut area and the light efficiency of the liquid crystal display device.
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 10 nm; 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 scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (8)
1. A liquid crystal module formed by a color conversion film is characterized in that a backlight source of the liquid crystal module adopts blue light as a light source, the light source is uniformly collimated to obtain a blue collimated plane uniform light source, the blue light is respectively transmitted out, green light with the blue light is converted out and red light with the blue light is converted out after passing through the color conversion film, and meanwhile, the color conversion film is matched with a color filter film to filter out the unconverted blue light in the color conversion film; wherein, the grids of the color conversion film intermediate layer are arranged in a group of periodical repetition by grids of a transparent region, grids of a green light region and grids of a red light region; the color conversion film comprises an intermediate layer, an upper layer and a lower layer, wherein the intermediate layer is tightly arranged with lattices, and the upper layer and the lower layer are respectively arranged on the upper part and the lower part of the intermediate layer and are respectively composed of transparent substrates with high transmittance; the grids of the middle layer are arranged in a periodic repeated mode by taking a grid of a transparent area capable of transmitting blue light/a grid embedded or coated with a blue light area capable of emitting blue primary light, a grid embedded or coated with a green light area capable of emitting green primary light and a grid embedded or coated with a red light area capable of emitting red primary light as a group, and the grids of the transparent area/the blue light area, the green light area and the red light area are separated by a black barrier; the color conversion film is made of a material selected by adopting a wide color gamut and high light efficiency spectrum calculation method so as to improve the color gamut range and efficiency of a liquid crystal display or lighting equipment, and the specific wide color gamut and high light efficiency spectrum calculation method comprises the following steps:
step S1, selecting a light source spectrum matched with the spectrum transmittance of a color filter film in the liquid crystal display device according to the spectrum transmittance of blue, green and red light regions of the color conversion film adopted in the liquid crystal display device, acquiring a plurality of groups of spectrum data, and calculating the spectrum distribution data of each group of spectra by adopting the following quantum dot spectrum Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λc)2/(Δλ)2] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λcRepresents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each set of spectral distribution data obtained in step S1 into corresponding color coordinates, respectively, the calculation formula is as follows:
where S (λ) is the emission spectrum of the backlight, X, Y, Z is the tristimulus value 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, SrgbRepresenting the area, x, of the gamut trianglerAnd yrIs the color coordinate of the red primary color, xgAnd ygIs the color coordinate of the primary color green, xbAnd ybIs the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, AdisplayDenotes the color gamut area of the display device, AstandardAn area representing a standard color gamut;
step S3, calculating the light energy ratio of the three primary color spectrums according to the color temperature requirement of the white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, which is specifically 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，yw，zw) Is the color coordinate of a known standard white light source, (x)i，yi，ziI ═ r, g, b) are the color coordinates of the red, green, blue three color components, respectively, (f)iI ═ r, g, b) are the proportions of the red, green, blue three color components, 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, Pout(λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while KmUnder the condition of photopic visionIn the case of an ideal monochromatic 555nm light source, the LER value is 683 lm/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, Pout(λ) is the power spectral density of the light source for the total output light, Pin(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 step S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each set of spectra as design spectral data of the color conversion film, and selecting a suitable material as a light conversion material of the color conversion film according to the spectral data.
2. A liquid crystal module formed by a color conversion film is characterized in that a backlight source of the liquid crystal module adopts ultraviolet light as a light source, the light source is uniformly collimated to obtain an ultraviolet collimation plane uniform light source, and the ultraviolet light uniform light source is converted into blue light with the ultraviolet light, green light with the ultraviolet light and red light with the ultraviolet light respectively after passing through the color conversion film; wherein the lattices of the color conversion film intermediate layer are arranged in a group of periodic repetition by the lattices in a blue light region, the lattices in a green light region and the lattices in a red light region; the color conversion film comprises an intermediate layer, an upper layer and a lower layer, wherein the intermediate layer is tightly arranged with lattices, and the upper layer and the lower layer are respectively arranged on the upper part and the lower part of the intermediate layer and are respectively composed of transparent substrates with high transmittance; the grids of the middle layer are arranged in a periodic repeated mode by taking a grid of a transparent area capable of transmitting blue light/a grid embedded or coated with a blue light area capable of emitting blue primary light, a grid embedded or coated with a green light area capable of emitting green primary light and a grid embedded or coated with a red light area capable of emitting red primary light as a group, and the grids of the transparent area/the blue light area, the green light area and the red light area are separated by a black barrier; the color conversion film is made of a material selected by adopting a wide color gamut and high light efficiency spectrum calculation method so as to improve the color gamut range and efficiency of a liquid crystal display or lighting equipment, and the specific wide color gamut and high light efficiency spectrum calculation method comprises the following steps:
step S1, selecting a light source spectrum matched with the spectrum transmittance of a color filter film in the liquid crystal display device according to the spectrum transmittance of blue, green and red light regions of the color conversion film adopted in the liquid crystal display device, acquiring a plurality of groups of spectrum data, and calculating the spectrum distribution data of each group of spectra by adopting the following quantum dot spectrum Gaussian fitting function:
S(λ)＝A·exp[-2.773(λ-λc)2/(Δλ)2] (1)
wherein S (λ) represents a quantum dot spectrum, A represents a spectral peak, and λcRepresents the center wavelength of the spectrum, and Δ λ represents the full width at half maximum wavelength of the spectrum;
step S2, converting each set of spectral distribution data obtained in step S1 into corresponding color coordinates, respectively, the calculation formula is as follows:
where S (λ) is the emission spectrum of the backlight, X, Y, Z is the tristimulus value 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, SrgbRepresenting the area, x, of the gamut trianglerAnd yrIs the color coordinate of the red primary color, xgAnd ygIs the color coordinate of the primary color green, xbAnd ybIs the color coordinate of the blue primary; CGR denotes the ratio of the gamut coverage, AdisplayDenotes the color gamut area of the display device, AstandardAn area representing a standard color gamut;
step S3, calculating the light energy ratio of the three primary color spectrums according to the color temperature requirement of the white balance to be achieved, and then calculating the light energy conversion efficiency of each group of spectrums according to the visual efficiency function, which is specifically 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，yw，zw) Is the color coordinate of a known standard white light source, (x)i，yi，ziI ═ r, g, b) are the color coordinates of the red, green, blue three color components, respectively, (f)iI ═ r, g, b) are the proportions of the red, green, blue three color components, 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, Pout(λ) is the power spectral density of the light source for the total output light, V (λ) is the standard luminosity function, while KmUnder the condition of photopic vision, under the condition of an ideal monochromatic 555nm light source, the LER value is 683 lm/W;
the light energy conversion efficiency of each set of spectra can be expressed by the following formula:
in the formula, Pout(λ) is the power spectral density of the light source for the total output light, Pin(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 step S4, selecting a spectral distribution combination with the best color gamut and light energy conversion efficiency from each set of spectra as design spectral data of the color conversion film, and selecting a suitable material as a light conversion material of the color conversion film according to the spectral data.
3. The liquid crystal module of claim 1, wherein the transparent filling in the lattice of the transparent region is a PET material or an optical PMMA material; the material embedded or coated in the grid of the blue light region, the grid of the green light region or the grid of the red light region is a quantum dot fluorescent material, wherein the blue light region is a blue quantum dot, the green light region is a green quantum dot, and the red light region is a red quantum dot.
4. The liquid crystal module of claim 1, wherein the lower layer and the upper layer are made of PET material or optical PMMA material, and have a thickness ranging from 0.05mm to 0.5 mm; the thickness of the middle layer is between 1um and 10 um.
5. The liquid crystal module of claim 1, wherein the size of each cell and the size of the barrier between cells in the middle layer are matched with the size of the light-transmitting portion and the size of the barrier of the color filter of the liquid crystal pixel of the liquid crystal display.
6. The liquid crystal module of claim 1, wherein in step S1, the light source spectrum is selected to match the spectral transmittance of the color filter in the liquid crystal display device, 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 set of spectra, that is, the optimum combination with the highest color gamut and the highest light energy conversion efficiency or both is selected according to the actual application.
7. The liquid crystal module of claim 2, wherein the light source incident on the color conversion film is collimated UV light, wherein the UV light has a central wavelength ranging from 325nm to 390nm and a full width at half maximum of 20nm, and the central wavelength ranges of the emission spectra of blue, green and red on the color conversion film are respectively: lambda is less than 445nmb＜460nm、510nm＜λg＜555nm、630nm＜λrLess than 685nm, and the full width at half maximum of its luminous spectrum is 30nm or less.
8. The liquid crystal display module of claim 1, wherein the light source incident on the color conversion film is collimated blue light having a peak central wavelength of 445nm to 460nm and a full width at half maximum of 20nm, and green and red lights are emitted on the color conversion filmThe central wavelengths of the spectrum peaks are respectively 510nm < lambdag＜555nm、630nm＜λrLess than 685nm, and a half-height width of the emission spectrum of 30nm or less.
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