High-color-gamut diffuser and preparation method therefor

Abstract

A high-color-gamut diffuser and a preparation method, relating to the technical field of diffuser materials. A high-haze diffusion layer (A), a quantum dot layer (B), and a specific spectral absorption layer (C) are subjected to in-mold three-layer co-extrusion molding to prepare a high-color-gamut diffuser. Green perovskite in the quantum dot layer (B) cooperates with a visible light absorber in the specific spectral absorption layer (C) to obtain an expected spectral emission profile, so that the high-color-gamut diffuser can absorb light at around 580 nm (yellow) in the spectrum. Overlaps between R / G (yellow) color filter absorption spectra are reduced as much as possible, so that leakage of other color emissions is prevented. The color gamut is expanded by means of an emission spectrum similar to those of QDs, and the high-color-gamut diffuser also has a certain absorption effect within the blue band portion of the spectrum, causing an overall loss in luminous intensity. Moreover, the luminance is increased, and chromaticity coordinates are low, which is suitable for KSF encapsulated strip lights. Furthermore, by means of spectrogram analysis and color gamut coverage area calculation, the DCI-P3 value and shielding performance are also improved.

Description

High color gamut diffusion plate and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of diffusion plate materials, in particular to a high color gamut diffusion plate and a preparation method thereof. BACKGROUND

[0002] Diffusion plates use light transmission to continuously refract, reflect and scatter between chemical particles and resins, while hiding light sources and dazzling light sources, so that the light source emits uniform, soft and beautiful light, achieving a comfortable effect of transparent light without opacity. Compared with traditional CCFL backlight, LED backlight has many advantages such as high color gamut, high brightness, long service life, energy saving and environmental protection, real-time color control, etc. The high color gamut LED backlight source makes the screens of electronic products such as televisions, mobile phones and tablet computers using it have more vivid colors and higher color reproduction. In order to make the color of the display screen more perfect and the color degree more rich and close to the color of the real world, researchers have been committed to finding ways to improve the color gamut value of LED backlight display screens.

[0003] The conventional method for improving color gamut is to increase QD FILM or QD SHEET, which not only has high cost but also needs a water and oxygen barrier layer. After long-term use, the color coordinates deviate greatly, or LAS FILM light-absorbing film is used to improve the color gamut, which has high coating cost and lower color gamut than QD FILM.

[0004] The patent for invention with publication number CN114236655A discloses a multi-layer co-extrusion structure diffusion plate, its application and preparation method, which includes an upper protective layer, an intermediate optical layer group and a lower protective layer. The intermediate optical layer group is arranged between the upper protective layer and the lower protective layer. The diffusion plate with a multi-layer co-extrusion structure has high brightness, light diffusion and high color gamut, and can meet the needs of new display fields. However, the quantum dots in the quantum dot layer are prone to thermal motion migration during high-temperature co-extrusion, resulting in uneven distribution of quantum dots in the quantum dot layer and irregular distribution, which affects the optical performance of the diffusion plate. TECHNICAL PROBLEM

[0005] The purpose of the present application is to provide a high color gamut diffusion plate with higher color gamut and more excellent optical effect. TECHNICAL SOLUTION

[0006] In order to solve the above technical problems, the present application provides the following technical solutions: a high color gamut diffusion plate, comprising a high haze diffusion layer, a quantum dot layer and a specific spectrum absorption layer which are sequentially and laminatedly compounded together; the high haze diffusion layer comprises the following components in mass percentage: 8-12% of a master batch, and the rest is polystyrene; the quantum dot layer comprises the following components in mass percentage: 1-3% of green light perovskite, 4-6% of a master batch, and the rest is polystyrene; and the specific spectrum absorption layer comprises the following components in mass percentage: 0.3-0.7% of a visible light absorber, 3-6% of a master batch, and the rest is polystyrene.

[0007] Preferably, the high haze diffusion layer comprises the following components in mass percentage: preferably 9-11% of a master batch, and the rest is polystyrene; the quantum dot layer comprises the following components in mass percentage: preferably 1.5-2.5% of green light perovskite, 4.5-5.5% of a master batch, and the rest is polystyrene; and the specific spectrum absorption layer comprises the following components in mass percentage: preferably 0.4-0.6% of a visible light absorber, 4-5% of a master batch, and the rest is polystyrene.

[0008] Preferably, the thickness is 1.8-2 mm; the thickness of the high haze diffusion layer is 4-8% of the thickness of the high color gamut diffusion plate; and the thickness of the specific spectrum absorption layer is 4-8% of the thickness of the high color gamut diffusion plate.

[0009] Preferably, the master batch comprises the following components in mass percentage: 14-18% of a light diffusing agent, and the rest is polystyrene; and the light diffusing agent is silicon dioxide.

[0010] Preferably, the master batch is prepared by mixing the components and then granulating by a double-screw granulator.

[0011] Preferably, the green perovskite is green quantum dots with a particle size of 2-3 nm.

[0012] Preferably, the visible light absorber has an absorption spectrum range of 560-580 nm.

[0013] In order to solve the above technical problems, the present application provides the following technical solutions: a preparation method of a high color gamut diffusion plate, comprising the following steps: preparing raw materials by mixing the components of a high haze diffusion layer, a quantum dot layer and a specific spectrum absorption layer according to mass percentage; and forming a high haze diffusion layer plate material layer, a quantum dot layer plate material layer and a specific spectrum absorption layer plate material layer which are sequentially and laminatedly compounded together by in-mold co-extrusion molding, so as to obtain the high color gamut diffusion plate.

[0014] Preferably, the extrusion speed is 3-3.2 m / min.

[0015] Preferably, the thicknesses of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are controlled by controlling the component metering pump rotating speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer. Advantages

[0016] Compared with the prior art, the present application has the following advantages:

[0017] The present application is to prepare a high color gamut diffusion plate by in-mold three-layer co-extrusion molding of a high-haze diffusion layer, a quantum dot layer and a specific spectrum absorption layer. The green perovskite in the quantum dot layer and the visible light absorber in the specific spectrum absorption layer cooperate to obtain the expected spectrum emission diagram, so that the high color gamut diffusion plate can absorb light spectrum around 580 nm (yellow). The overlap between the R / G (yellow) color filter absorption spectrum is minimized to avoid leakage of other color emission. The increase in color gamut is achieved by similar emission spectrum of QD. The high color gamut diffusion plate also has a certain absorption effect on the blue band, resulting in a loss of overall brightness, while improving the brightness, the color coordinates are low, and it is more suitable for KSF packaged light bars. And through spectrum analysis and color gamut coverage area calculation, the DCI-P3 value and the shielding property are also improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a schematic diagram of the structure of the high color gamut diffusion plate of the present application;

[0019] Fig. 2 is a spectrum emission principle diagram of the high color gamut diffusion plate of the present application;

[0020] Fig. 3 is a spectrum emission chromatogram of the high color gamut diffusion plate of Example 1 of the present application;

[0021] Fig. 4 is a DCI-P3 color gamut diagram of the high color gamut diffusion plate of Example 1 of the present application;

[0022] Fig. 5 is a color gamut diagram of the diffusion plate of the comparative example;

[0023] Fig. 6 is a spectrum emission chromatogram of the diffusion plate of the comparative example. Embodiment of the present application

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application.

[0025] The green perovskite (CH3NH3PbBr3 quantum dot) used in the present application is prepared by the method of Example 3 in the application number CN 104861958 A; the visible light absorber VL-580 is produced by Jiangxi Luote Chemical Co., Ltd.; and the light diffusing agent silicon dioxide is produced by Anhui Xingjingtong New Material Technology Co., Ltd.

[0026] The master batch of the present application is prepared by mixing the light diffusing agent silicon dioxide and polystyrene and granulating by a double-screw granulator.

[0027] (Example 1)

[0028] The mass percentage of each layer component in this example is:

[0029] Masterbatch: 14% light diffuser, the rest is polystyrene;

[0030] High haze diffusion layer thickness 0.15mm: 8% masterbatch, the rest is polystyrene;

[0031] Quantum dot layer 1.7mm: 1% green light perovskite, 4% masterbatch, the rest is polystyrene;

[0032] Specific spectrum absorption layer 0.15mm: 0.3% visible light absorber, 3% masterbatch, the rest is polystyrene;

[0033] The preparation method of the high color gamut diffusion plate in this example is:

[0034] After the components of the high haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, the high haze diffusion layer plate material layer, the quantum dot layer plate material layer and the specific spectrum absorption layer plate material layer are formed by in-mold co-extrusion molding and stacked together in turn. The extrusion speed is 3m / min, the high color gamut diffusion plate is prepared, and the thickness of the high haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer is controlled by controlling the component metering pump speed of the high haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0035] (Example 2)

[0036] The mass percentage of each layer component in this example is:

[0037] Masterbatch: 16% light diffuser, the rest is polystyrene;

[0038] High haze diffusion layer thickness 0.15mm: 10% masterbatch, the rest is polystyrene;

[0039] Quantum dot layer 1.7mm: 2% green light perovskite, 5% masterbatch, the rest is polystyrene;

[0040] Specific spectrum absorption layer 0.15mm: 0.5% visible light absorber, 4% masterbatch, the rest is polystyrene;

[0041] The preparation method of the high color gamut diffusion plate in this example is:

[0042] The components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, and then in-mold co-extrusion molding is performed to form the high-haze diffusion layer plate layer, the quantum dot layer plate layer and the specific spectrum absorption layer plate layer which are stacked together in sequence, the extrusion speed is 3.1 m / min, and a high color gamut diffusion plate is prepared, and the thickness of each of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer is controlled by controlling the component metering pump speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0043] (Example 3)

[0044] The mass percentage of each layer component in this example is:

[0045] Master batch: 18% light diffusing agent, and the rest is polystyrene;

[0046] High-haze diffusion layer thickness 0.15 mm: 12% master batch, and the rest is polystyrene;

[0047] Quantum dot layer 1.7 mm: 1-3% green light perovskite, 6% master batch, and the rest is polystyrene;

[0048] Specific spectrum absorption layer 0.15 mm: 0.7% visible light absorber, 6% master batch, and the rest is polystyrene;

[0049] The preparation method of the high color gamut diffusion plate in this example is:

[0050] The components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, and then in-mold co-extrusion molding is performed to form the high-haze diffusion layer plate layer, the quantum dot layer plate layer and the specific spectrum absorption layer plate layer which are stacked together in sequence, the extrusion speed is 3.2 m / min, and a high color gamut diffusion plate is prepared, and the thickness of each of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer is controlled by controlling the component metering pump speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0051] (Example 4)

[0052] The mass percentage of each layer component in this example is:

[0053] Master batch: 16% light diffusing agent, and the rest is polystyrene;

[0054] High-haze diffusion layer thickness 0.10 mm: 10% master batch, and the rest is polystyrene;

[0055] Quantum dot layer 1.7 mm: 2% green light perovskite, 5% master batch, and the rest is polystyrene;

[0056] Specific spectrum absorption layer 0.10 mm: 0.5% visible light absorber, 4% master batch, and the rest is polystyrene;

[0057] The preparation method of the high color gamut diffusion plate in this embodiment is as follows:

[0058] After the components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, the high-haze diffusion layer plate layer, the quantum dot layer plate layer and the specific spectrum absorption layer plate layer are formed in sequence by in-mold co-extrusion molding, and the extrusion speed is 3.1 m / min, so as to obtain the high color gamut diffusion plate. The thickness of each layer is controlled by controlling the component metering pump speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0059] (Example 5)

[0060] The mass percentage of each layer component in this embodiment is as follows:

[0061] Master batch: 16% light diffusing agent, and the rest is polystyrene;

[0062] High-haze diffusion layer thickness 0.13 mm: 10% master batch, and the rest is polystyrene;

[0063] Quantum dot layer 1.7 mm: 2% green light perovskite, 5% master batch, and the rest is polystyrene;

[0064] Specific spectrum absorption layer 0.13 mm: 0.5% visible light absorber, 4% master batch, and the rest is polystyrene;

[0065] The preparation method of the high color gamut diffusion plate in this embodiment is as follows:

[0066] After the components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, the high-haze diffusion layer plate layer, the quantum dot layer plate layer and the specific spectrum absorption layer plate layer are formed in sequence by in-mold co-extrusion molding, and the extrusion speed is 3.1 m / min, so as to obtain the high color gamut diffusion plate. The thickness of each layer is controlled by controlling the component metering pump speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0067] (Example 6)

[0068] The mass percentage of each layer component in this embodiment is as follows:

[0069] Master batch: 16% light diffusing agent, and the rest is polystyrene;

[0070] High-haze diffusion layer thickness 0.10 mm: 10% master batch, and the rest is polystyrene;

[0071] Quantum dot layer 1.8 mm: 2% green light perovskite, 5% master batch, and the rest is polystyrene;

[0072] 0.10mm: 0.5% visible light absorber, 4% master batch, the rest is polystyrene;

[0073] The preparation method of the high color gamut diffusion plate in the embodiment is as follows:

[0074] After the components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, the high-haze diffusion layer plate layer, the quantum dot layer plate layer and the specific spectrum absorption layer plate layer are formed by in-mold co-extrusion molding, the extrusion speed is 3.1 m / min, the high color gamut diffusion plate is prepared, and the thickness of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer is controlled by controlling the component metering pump speed of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer.

[0075] The structure of the high color gamut diffusion plate of the application is shown in Figure 1, A is a high-haze diffusion layer, B is a quantum dot layer, and C is a specific spectrum absorption layer.

[0076] Figure 2 is a spectrum emission principle diagram of the high color gamut diffusion plate of the application, and Figure 3 is a spectrum emission chromatogram of the color gamut diffusion plate of Example 1. The emission spectrum and the absorption spectrum in Figure 2 are superimposed to obtain the expected spectrum emission diagram shown in Figure 3, the vertical coordinate of the spectrum diagram is light intensity, and the horizontal coordinate is wavelength.

[0077] The color gamut diagram (without screen test calculation data) of the high color gamut diffusion plate DCI-P3 of Example 1 is shown in Figure 4, the transmittance of the high color gamut diffusion plate of Example 1 is 47%, the average brightness is 212 Nit, the gloss (JND) is 64.26, the center color coordinates X: 0.2498, Y: 0.2323.

[0078] The diffusion plate of the comparative example is a mass-produced ordinary diffusion plate, and the formula uses the prior art. The color gamut diagram (without screen test calculation data) of the high color gamut diffusion plate DCI-P3 of the comparative example is shown in Figure 5, the transmittance of the high color gamut diffusion plate of the comparative example is 29%, the average brightness is 235 Nit, the gloss (JND) is 28.32, the center color coordinates X: 0.2640, Y: 0.2431. The spectrum emission chromatogram of the diffusion plate of the comparative example is shown in Figure 6.

[0079] By adding green light perovskite and visible light absorber and using this in-mold three-layer extrusion method to prepare the high color gamut diffusion plate, the brightness can be improved, the color coordinates are low, and it is more suitable for KSF packaged light bars. And through spectrum analysis and color gamut coverage area calculation, the DCI-P3 value is increased by nearly 8%, and the masking property is also improved.

[0080] Obviously, the above embodiments are only examples for clearly illustrating the embodiments of the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations extending from the spirit of the present application are still within the protection scope of the present application.

Claims

1. A high color gamut diffuser plate characterized by, The high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are sequentially stacked together; the high-haze diffusion layer comprises the following components in mass percentage: 8-12% of master batch, and the rest is polystyrene; the quantum dot layer comprises the following components in mass percentage: 1-3% of green light perovskite, 4-6% of master batch, and the rest is polystyrene; and the specific spectrum absorption layer comprises the following components in mass percentage: 0.3-0.7% of visible light absorber, 3-6% of master batch, and the rest is polystyrene.

2. The high color gamut diffusion plate of claim 1, wherein, The high-haze diffusion layer comprises the following components in mass percentage: 9-11% of master batch, and the rest is polystyrene; the quantum dot layer comprises the following components in mass percentage: 1.5-2.5% of green light perovskite, 4.5-5.5% of master batch, and the rest is polystyrene; and the specific spectrum absorption layer comprises the following components in mass percentage: 0.4-0.6% of visible light absorber, 4-5% of master batch, and the rest is polystyrene.

3. The high color gamut diffusion plate of claim 1, wherein, The thickness is 1.8-2mm; the thickness of the high-haze diffusion layer is 4-8% of the thickness of the high-color gamut diffusion plate; and the thickness of the specific spectrum absorption layer is 4-8% of the thickness of the high-color gamut diffusion plate.

4. The high color gamut diffusion plate of claim 1, wherein, The master batch comprises the following components in mass percentage: 14-18% of light diffuser, and the rest is polystyrene; and the light diffuser is silica.

5. The high color gamut diffusion plate of claim 4, wherein, The master batch is prepared by mixing the components and then granulating by a double-screw granulator.

6. The high color gamut diffuser sheet of claim 1, wherein, The green perovskite is green quantum dot with a particle size of 2-3nm.

7. The high color gamut diffuser sheet of claim 1, wherein, The visible light absorber has an absorption spectrum range of 560-580nm.

8. A method of manufacturing a high color gamut diffuser sheet according to claim 1, wherein The components of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer are prepared according to the mass percentage ratio, and then in-mold co-extrusion is performed to form the high-haze diffusion layer plate, the quantum dot layer plate and the specific spectrum absorption layer plate which are sequentially stacked together, thereby obtaining the high-color gamut diffusion plate.

9. The method of claim 8, wherein the high color gamut diffusion plate is prepared by the steps of: The extrusion speed is 3-3.2m / min. ​ 10. The method of claim 8, wherein the high color gamut diffusion plate is prepared by the steps of: The thickness of each of the high-haze diffusion layer, the quantum dot layer and the specific spectrum absorption layer is controlled by controlling the rotation speed of the component metering pump of each layer. ​

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