CN116953983A - Light conversion diffusion sheet for blue light source, backlight module and display - Google Patents
Light conversion diffusion sheet for blue light source, backlight module and display Download PDFInfo
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- CN116953983A CN116953983A CN202210399181.4A CN202210399181A CN116953983A CN 116953983 A CN116953983 A CN 116953983A CN 202210399181 A CN202210399181 A CN 202210399181A CN 116953983 A CN116953983 A CN 116953983A
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- light
- light conversion
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Classifications
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Luminescent Compositions (AREA)
Abstract
The application relates to the technical field of light emission and display, in particular to a light conversion diffusion sheet for a blue light source, a backlight module and a display. The light conversion diffusion sheet comprises a diffusion sheet main body and a light conversion layer attached to the diffusion sheet main body; the light conversion layer includes a transparent resin and light conversion particles dispersed in the transparent resin; the light conversion particles comprise 30% -40% of red light conversion particles and 1% -10% of green light conversion particles, which are used for respectively carrying out light conversion on part of blue light passing through the diffusion sheet main body to respectively obtain red light and green light, wherein the weight percentage of the light conversion particles is calculated by the weight percentage of the transparent resin. The light conversion diffusion sheet can effectively reduce blue light and obtain accurate white field coordinates.
Description
Technical Field
The application relates to the technical field of light emission and display, in particular to a light conversion diffusion sheet for a blue light source, a backlight module and a display.
Background
In recent years, global tele-office, remote education and home entertainment demands are comprehensively improved, and larger demands are brought to the display industry, so that electronic display devices play an indispensable role in the work and life of people. Liquid Crystal Displays (LCDs) are the most developed and widely used display devices in the display technology at present. However, the high-intensity blue light in the LCD display device has serious influence on human eyesight and circadian rhythm, so that the damage of the high-intensity blue light of the electronic display device to human health is not negligible.
Currently, the backlight of the LCD has two modes of side-in type and direct type. The side-in type backlight LCD is more energy-saving, but the panel may suffer from backlight unevenness or light leakage during use. Compared with a side-in backlight LCD, the direct type backlight LCD can enable a light source to be more uniformly transmitted to the whole display screen, and the display picture is finer and more vivid in detail especially when the direct type backlight LCD is applied to a large-size display device. However, the LCD display device emits light by means of a backlight source, white light emitted by the LCD display device is realized by exciting yellow fluorescent powder by a blue light chip, and the white light obtained by the method has low color gamut coverage rate due to lack of green light and red light components, and has low reduction degree of display colors.
In view of this, the present application has been made.
Disclosure of Invention
A first object of the present application is to provide a light conversion diffusion sheet for a blue light source, comprising a diffusion sheet body and a light conversion layer attached to the diffusion sheet body;
the light conversion layer includes a transparent resin and light conversion particles dispersed in the transparent resin;
the light conversion particles comprise 30% -40% of red light conversion particles and 1% -10% of green light conversion particles, which are used for respectively carrying out light conversion on part of blue light passing through the diffusion sheet main body to respectively obtain red light and green light, wherein the weight percentage of the light conversion particles is calculated by the weight percentage of the transparent resin.
The second objective of the present application is to provide a backlight module, which includes a blue light source assembly, a light guide plate, and a light conversion diffusion sheet as described above.
A third objective of the present application is to provide a display device including the backlight module described above.
A fourth object of the present application is to provide a method of preparing a light conversion diffusion sheet as described above, comprising:
the light conversion particles are uniformly dispersed in the transparent resin and coated on the diffusion sheet body.
Compared with the prior art, the application has the beneficial effects that:
1) The high-energy blue light in the display device can be effectively reduced, the influence of the blue light on the vision and the circadian rhythm of a person is reduced, and the effect of healthy display is achieved.
2) The red light and green light intensity of the display device can be improved, the white color coordinates of the display device are improved, the display picture is more beautiful and vivid, and the effect of comfortable display is achieved.
3) Blue light can be converted into red light and green light, the light source utilization efficiency is improved, and energy conservation and environmental protection are realized.
4) The light conversion diffusion sheet has simple preparation process and convenient production and application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a light conversion diffusion sheet for a blue light source according to an embodiment of the present application; a 1-light conversion layer, a 2-diffusion sheet body, 3-diffusion particles, 4-red light conversion particles, 5-green light conversion particles;
FIG. 2 is a graph showing the luminescence spectrum of the light conversion diffusion sheet according to the embodiments 1 to 3 of the present application;
FIG. 3 is a graph showing the luminescence spectra of the light conversion diffusion sheets according to examples 3 to 5 of the present application;
FIG. 4 is CIE color coordinate values for examples 1-5; numerals 1 to 5 represent examples 1 to 5.
Detailed Description
Reference now will be made in detail to embodiments of the application, one or more examples of which are described below. Each example is provided by way of explanation, not limitation, of the application. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment.
Unless otherwise defined, all terms (including technical and scientific terms) used to describe the application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. By way of further guidance, the following definitions are used to better understand the teachings of the present application. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The term "and/or," "and/or," as used herein, includes any one of two or more of the listed items in relation to each other, as well as any and all combinations of the listed items in relation to each other, including any two of the listed items in relation to each other, any more of the listed items in relation to each other, or all combinations of the listed items in relation to each other. It should be noted that, when at least three items are connected by a combination of at least two conjunctions selected from the group consisting of "and/or", "and/or", it should be understood that, in the present application, the technical solutions include technical solutions that all use "logical and" connection, and also include technical solutions that all use "logical or" connection. For example, "a and/or B" includes three parallel schemes A, B and a+b. For another example, the technical schemes of "a, and/or B, and/or C, and/or D" include any one of A, B, C, D (i.e., the technical scheme of "logical or" connection), and also include any and all combinations of A, B, C, D, i.e., any two or three of A, B, C, D, and also include four combinations of A, B, C, D (i.e., the technical scheme of "logical and" connection).
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The recitation of numerical ranges by endpoints of the present application includes all numbers and fractions subsumed within that range, as well as the recited endpoint.
For ease of description, spatially relative terms such as "under", "below", "lower", "upper" and the like may be used herein to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, in an exemplary embodiment, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "under … …" can encompass both an orientation of above and below. The devices may be oriented differently (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein interpreted accordingly.
Taking into account the measurements in question and the errors associated with a particular amount of measurement (i.e., limitations of the measurement system), as used herein "about" or "approximately" includes the values and is meant to be within the acceptable deviation range for the particular value as determined by one of ordinary skill in the art. For example, "about" may mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the value.
In the present application, the terms "plurality", and the like refer to, unless otherwise specified, 2 or more in number.
In the application, the technical characteristics described in an open mode comprise a closed technical scheme composed of the listed characteristics and also comprise an open technical scheme comprising the listed characteristics.
In the present application, "preferred", "better", "preferred" are merely embodiments or examples which are better described, and it should be understood that they do not limit the scope of the present application.
In the application, the technical characteristics described in an open mode comprise a closed technical scheme composed of the listed characteristics and also comprise an open technical scheme comprising the listed characteristics.
The application relates to a light conversion diffusion sheet for a blue light source, which comprises a diffusion sheet main body and a light conversion layer attached to the diffusion sheet main body;
the light conversion layer includes a transparent resin and light conversion particles dispersed in the transparent resin;
the light conversion particles comprise 30% -40% of red light conversion particles and 1% -10% of green light conversion particles, which are used for respectively carrying out light conversion on part of blue light passing through the diffusion sheet main body to respectively obtain red light and green light, wherein the weight percentage of the light conversion particles is calculated by the weight percentage of the transparent resin.
The light conversion diffusion sheet not only can convert light passing through the light guide plate into a uniform surface light source, but also can reduce the intensity of high-energy blue light and convert it into red light and green light. By adjusting the red light conversion particles and the green light conversion particles, the light conversion diffusion sheet can make the white field color coordinates displayed more accurate.
The color reduction degree of the display picture is improved, the display picture is more bright, and healthy and comfortable display of the display equipment is realized.
In the present application, the "light conversion diffusion sheet" is a sheet-like, or layered, or film-like structure, and its shape may be a planar shape or an arc-like or amorphous shape.
The light conversion layer may be one layer, two layers, or more layers.
Any optically transparent resin suitable for the light conversion layer can be used in the present application, such as acrylic resin, epoxy resin, polyester resin, o-cresol novolac epoxy acrylate, novolac epoxy methacrylate, o-cresol novolac epoxy acrylic resin, and resins for optical grade polymer materials.
In some embodiments, the light conversion particles comprise 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% red light conversion particles by weight percent of the transparent resin.
In some embodiments, the light conversion particles comprise 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% of green light conversion particles, by weight percent of the transparent resin.
In a more preferred embodiment, the light conversion particles comprise 33% to 37% of red light conversion particles and 2% to 8% of green light conversion particles; in a more preferred embodiment, the light conversion particles comprise 34% to 36% of red light conversion particles and 4% to 6% of green light conversion particles.
The red light converting particles may be selected from the group consisting of ingredients well known in the art, such as fluorosilicate red phosphor, oxynitride red phosphor, molybdate red phosphor, sulfur oxide red phosphor, nile red derivative, rhodamine derivative, and iridium metal complex. Preferably, the red light conversion particles are selected from fluorosilicate red phosphors.
The green light conversion particles may be selected from the group consisting of ingredients well known in the art, such as chlorosilicate green phosphor, oxynitride green phosphor, aluminate green phosphor, perovskite green phosphor, coumarin derivatives, azo dyes, anthraquinone dyes, nitrodiphenylamine dyes, and 1-nitroso-2-naphthol. Preferably, the green light conversion particles are selected from aluminate green phosphors.
In some embodiments, the light-converting particles are at least partially surface modified with a modifier selected from the group consisting of:
at least one of vinyltriethoxysilane, 9-octadecenoic acid, 9-octadecenylamine, vinyltris (. Beta. -methoxyethoxy) silane, gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, (methacryloyloxy) propyl trimethoxysilane and 3-glycidoxypropyl triethoxysilane.
The method of surface modification may be conventional and includes, for example: the light-converting particles and the surface modifier are added to a mixture of the dispersion medium and the modifier, stirred at an elevated temperature (e.g., 50 ℃ to 150 ℃, preferably 60 ℃ to 90 ℃), and the optionally obtained surface-modified light-converting particles are dried at an elevated temperature (e.g., 100 ℃ to 140 ℃ for 0.5h to 2 h) to obtain the surface-modified light-converting material.
The dispersion medium may be selected from one or more of the following: n, N-dimethylformamide, dimethyl sulfoxide, dichloromethane, chloroform, N-hexane, toluene, dimethylacetamide, ethyl acetate, N-methylpyrrolidone, benzene and acetone. The dispersion medium also has a modifying effect. The light conversion particles may comprise 25% to 75% by mass of the mixture, for example 25% to 65%,35% to 75%,55% to 65% etc.
In some embodiments, the weight ratio of the light conversion particles to the modifying agent is 10:0.1 to 1. For example, 0.2:1,0.3:1,0.4:1,0.5:1,0.6:1,0.7:1,0.8:1,0.9:1,1.0:1,1.1:1,1.2:1,1.3:1,1.4:1,1.5:1,1.6:1,1.7:1,1.8:1,1.9:1,2.0:1,2.1:1,2.2:1,2.3:1,2.4:1,2.5:1,2.6:1,2.7:1,2.8:1,2.9:1,3.0:1,3.1:1,3.2:1, 3.3:3.3:1, 3.4:1, 3.6:1,3.7:1,3.8:1,3.9:1, 4.4:1, 4:1, 4.6:1, 4:1, 4.4:1, 4.6:1, 4.4:1, 4:1, 4.6:1).
In some embodiments, the weight ratio of the light conversion particles to the dispersion medium is 1: 20.200. For example, 1:22,1:28,1:33,1:40,1:42,1:48,1:53,1:57,1:60,1:65,1:68,1:76,1:78,1:82,1:85,1:87,1:90,1:93,1:98,1:100,1:102,1:105,1:108,1:113,1:115,1:119,1:123,1:128,1:129,1:134,1:136,1:138,1:140,1:141,1:144,1:149,1:152,1:156,1:158,1:160,1:161,1:163,1:168,1:172,1:183,1:190,1:192,1:198, or 1:200.
In some embodiments, at least 50%, at least 60%, at least 70%, at least 80%, or at least 90% of the red light converting particles are modified. In some embodiments, at least 50%, at least 60%, at least 70%, at least 80%, or at least 90% of the green light conversion particles are modified.
In some embodiments, the diffusion sheet body includes a substrate and diffusion particles.
In some embodiments, the substrate is selected from at least one of polyethylene terephthalate, polymethyl methacrylate, polycarbonate, cellulose triacetate, polypropylene, polyethylene, polystyrene, polyvinyl chloride, and nylon.
In some embodiments, the diffusing particles are selected from one or more of the following:
polystyrene, polymethyl methacrylate, polycarbonate, polyurethane, silicone polymer, acrylonitrile-butadiene-styrene copolymer, al 2 O 3 、ZnO、CaO、CaCO 3 、MgO、BaO、BaSO 4 、TiO 2 And ZrO(s) 2 。
In some embodiments, the diffusing particles have a particle size of 5 μm to 60 μm.
The application also relates to a backlight module which comprises a blue light source component, a light guide plate and the light conversion diffusion sheet.
The blue light source assembly may be a Light Emitting Diode (LED), an Electroluminescence (ELP), a Cold Cathode Fluorescent Lamp (CCFL), a hot cathode ray tube (HCFL), an External Electrode Fluorescent Lamp (EEFL), or an incandescent lamp.
The backlight module may further include other components known to those skilled in the art, such as one or more of a back plate, a reflective sheet, a brightness enhancing sheet, an optical film (e.g., a prism sheet, a reflective polarizer sheet, a high reflectivity reflective sheet, etc.).
In one embodiment, the blue light source assembly is mounted on the back plate; the reflecting sheet is arranged on the backboard and is provided with small holes; the LED lamp beads arranged on the blue light source component are positioned in the holes of the emission sheet; the light conversion diffusion sheet is positioned above the light guide plate.
The application also relates to a display, which comprises the backlight module.
The display provided by the application can be used for various electronic devices, such as mobile phones, notebook computers, tablet computers, desktop computers, televisions, head-mounted display devices and the like.
The light conversion diffusion sheet provided by the application is used for a direct type backlight module and can be used for obviously improving the luminous performance of a display. The improved luminescence properties include: the decrease in the intensity of the harmful blue light, the enhancement of the green and red bands, and the conversion of cool white light to warm white light. In particular, it can effectively improve white coordinates.
The present application also relates to a method of preparing a light-converting diffusion sheet as described above, comprising:
the light conversion particles are uniformly dispersed in the transparent resin and coated on the diffusion sheet body.
In some embodiments, the method of coating is wire bar coating or knife coating.
In some embodiments, the thickness of the coating is 40 μm, 50 μm, 60 μm, 70 μm, or 80 μm.
Embodiments of the present application will be described in detail below with reference to examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental methods in the following examples, in which specific conditions are not noted, are preferably referred to in the guidelines given in the present application, and may be according to the experimental manuals or conventional conditions in the art, and may be referred to other experimental methods known in the art, or according to the conditions suggested by the manufacturer.
In the specific examples described below, the measurement parameters relating to the raw material components, unless otherwise specified, may have fine deviations within the accuracy of weighing. Temperature and time parameters are involved, allowing acceptable deviations from instrument testing accuracy or operational accuracy.
Example 1
1) 10g of fluorosilicate red phosphor was weighed out, added to 40g of toluene solution, and 0.36g of gamma-aminopropyl triethoxysilane was added thereto. And (3) fully stirring at 85 ℃ for reaction for 10 hours, carrying out suction filtration after the reaction is finished, flushing with toluene to remove residual silane coupling agent, and drying at 120 ℃ for 1 hour in an oven to obtain modified red light conversion particles.
2) 50g of acrylic resin is taken and dissolved in 20g of ethanol, 10g of modified fluorosilicate red fluorescent powder is added, and the mixture is stirred uniformly. The mixed slurry is coated on the diffusion sheet by adopting a roll coater, and is supplied into a feeding vehicle in a coating area by a flexible pump, a diaphragm pump or a pipeline by gravity, and the coating liquid in a stirring barrel is stirred at a low speed in the feeding process so as to prevent the precipitation of particles. The coating thickness was set at 60 μm with an error of < 4 μm. And drying the film formed by coating through a gradient hot air type drying tunnel, and finally rolling to obtain the light conversion diffusion sheet.
Example 2
The adjustment was made on the basis of example 1, except that 15g of modified fluorosilicate red phosphor was added in step 2).
Example 3
The adjustment was made on the basis of example 1, except that 20g of modified fluorosilicate red phosphor was added in step 2).
Example 4
The adjustment was made on the basis of example 1, with the difference that:
step 1) adding the steps of preparing green fluorescent powder: 15g of aluminate green phosphor was taken and added to 40g of toluene solution, to which 0.23g of gamma-aminopropyl triethoxysilane was added. And (3) fully stirring at 85 ℃ for reaction for 10 hours, carrying out suction filtration after the reaction is finished, flushing with toluene to remove residual silane coupling agent, and drying at 120 ℃ for 1 hour in an oven to obtain modified green light conversion particles.
In the step 2), 50g of acrylic resin is dissolved in 20g of ethanol, 17.5g of modified fluorosilicate red fluorescent powder and 2.5g of modified aluminate green fluorescent powder are added, and the mixture is stirred uniformly.
Example 5
The adjustment was made on the basis of example 4, with the difference that:
in the step 2), 50g of acrylic resin is dissolved in 20g of ethanol, 15g of modified fluorosilicate red fluorescent powder and 5g of modified aluminate green fluorescent powder are added, and the mixture is stirred uniformly.
The light conversion diffusion sheets prepared in examples 1 to 5 were cut to a suitable size and placed in a back light module of a head display. The luminescence spectrum of each light conversion diffusion sheet was tested by a fluorescence spectrophotometer (type F-280, bejing Ji Tepu, biotechnology limited), and the data tested by the fluorescence spectrophotometer was converted into color coordinate data by CIE1931 color coordinate calculation software. The results are shown in Table 1 and FIGS. 2 to 4.
TABLE 1
From the experimental results, the white field color coordinates displayed by the display are regulated and controlled by adjusting the ratio of the fluorescent powder in the system. In examples 1,2 and 3, the proportion of red phosphor was continuously adjusted to adjust the white color coordinates, the fluorescence spectrum was as shown in fig. 2, the proportion of red phosphor was continuously increased, the blue light was decreased to a higher degree, when the mass ratio of red phosphor was 40%, the blue light was decreased to 63%, the red light was increased to 200%, and the white color coordinates were (0.33,0.31). Examples 3,4, and 5 are fixed total amount of phosphor, increasing amount of green phosphor, further adjusting white coordinates to be closer to ideal white coordinates (0.33 ), and fluorescence spectra are shown in fig. 3. FIG. 4 is CIE color coordinate values for examples 1-5. It can be seen that example 4 successfully adjusted the white field color coordinates to the ideal white field color coordinates.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. The scope of the application is therefore intended to be covered by the appended claims, and the description and drawings may be interpreted in accordance with the contents of the claims.
Claims (12)
1. A light conversion diffusion sheet for a blue light source, comprising a diffusion sheet body and a light conversion layer attached to the diffusion sheet body;
the light conversion layer includes a transparent resin and light conversion particles dispersed in the transparent resin;
the light conversion particles comprise 30% -40% of red light conversion particles and 1% -10% of green light conversion particles, which are used for respectively carrying out light conversion on part of blue light passing through the diffusion sheet main body to respectively obtain red light and green light, wherein the weight percentage of the light conversion particles is calculated by the weight percentage of the transparent resin.
2. The light-converting diffuser of claim 1, the red light-converting particles being selected from fluorosilicate red phosphors.
3. The light-converting diffuser of claim 1, said green light-converting particles being selected from aluminate green phosphors.
4. A light-converting diffuser according to any one of claims 1 to 3, wherein at least part of the light-converting particles are surface-modified with a modifier selected from the group consisting of:
at least one of vinyltriethoxysilane, 9-octadecenoic acid, 9-octadecenylamine, vinyltris (. Beta. -methoxyethoxy) silane, gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, (methacryloyloxy) propyl trimethoxysilane and 3-glycidoxypropyl triethoxysilane.
5. A light conversion diffuser according to any one of claims 1 to 3, the diffuser body comprising a substrate and diffusing particles.
6. The light converting diffusion sheet of claim 5, wherein the substrate is at least one selected from the group consisting of polyethylene terephthalate, polymethyl methacrylate, polycarbonate, cellulose triacetate, polypropylene, polyethylene, polystyrene, polyvinyl chloride, and nylon.
7. The light converting diffuser of claim 5, the diffuser particles being selected from one or more of the following:
polystyrene, polymethyl methacrylate, polycarbonate, polyurethane, silicone polymer, acrylonitrile-butadiene-styrene copolymer, al 2 O 3 、ZnO、CaO、CaCO 3 、MgO、BaO、BaSO 4 、TiO 2 And ZrO(s) 2 。
8. The light-converting diffuser of claim 5, the diffuser particles having a particle size of 5 to 60 μm.
9. A backlight module comprising a blue light source assembly, a light guide plate, and the light conversion diffusion sheet according to any one of claims 1 to 8.
10. A display comprising the backlight module of claim 9.
11. A method of making the light converting diffusion sheet of any one of claims 1 to 8, comprising:
the light conversion particles are uniformly dispersed in the transparent resin and coated on the diffusion sheet body.
12. The method of claim 11, wherein the coating has a thickness of 40 μm to 80 μm.
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| CN202210399181.4A CN116953983A (en) | 2022-04-15 | 2022-04-15 | Light conversion diffusion sheet for blue light source, backlight module and display |
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