A core-shell structure quantum dot dual-band blue light blocking backlight module

Abstract

This utility model relates to a core-shell structure quantum dot dual-band anti-blue light backlight module in the field of display technology. It includes a substrate with a driving circuit on it. From bottom to top, the substrate is sequentially arranged with a light source layer, an emissive layer, a filter layer, and a diffusion layer. The light source layer is composed of blue quantum dots, and the emissive layer is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene, with the red and green quantum dots uniformly dispersed in the transparent polystyrene. The filter layer is a perovskite quantum dot core-shell structure layer, constructed using perovskite quantum dot core-shell material (CsPbBr3 / ZnS). The diffusion layer is composed of nanoscale polymer particles and EVA. This utility model provides eye protection, improves image quality, meets the human eye's visual brightness requirements and color synthesis needs, and brings users a display effect that combines health and a high-quality visual experience.

Description

Technical Field

[0001] This utility model belongs to the field of display technology, specifically relating to a core-shell structure quantum dot dual-band anti-blue light backlight module. Background Technology

[0002] In recent years, display technology has been iterating at an increasingly rapid pace, from traditional LCD displays to the booming quantum dot and OLED displays. Display devices are widely used in televisions, computers, mobile phones, automotive displays, and many other fields, deeply integrated into people's daily work and life. As users spend more time using display devices, more stringent requirements are being placed on their health and image quality. Current technologies, particularly the traditional backlight modules used in display devices, have numerous defects that negatively impact both the health and image quality of the display devices.

[0003] First, traditional backlight modules generally use blue LEDs to excite phosphors to produce white light, which presents a serious problem of harmful blue light leakage. The peak wavelength of blue LEDs is approximately 450nm, easily releasing harmful blue-violet light. Medical research shows that prolonged exposure to this blue light can cause irreversible damage to photoreceptor cells in the retina, increasing the risk of eye diseases such as macular degeneration and retinitis pigmentosa. People who work with display devices as their primary tool commonly experience varying degrees of eye strain, and harmful blue light is one of the main contributing factors. Second, the phosphors used in traditional backlight modules have an inherent defect of spectral broadening, resulting in severely insufficient color purity. Actual tests show that display devices using traditional backlight modules typically fail to achieve the ideal Rec.2020 color gamut. In film and television production, directors and colorists need to accurately reproduce colors to convey the emotions of their work. Traditional display devices cannot accurately reproduce the rich color details of High Dynamic Range (HDR) content. In the graphic design industry, designers have extremely high requirements for color accuracy. The limited color gamut of traditional display devices results in significant differences in the display effect of designs on different devices, making it difficult to meet professional needs. For ordinary consumers, with their increasing demands for visual enjoyment, it is difficult to meet their requirements for more realistic and vibrant color display effects. In addition, the use of traditional quantum dots is prone to non-radiative recombination, leading to blue-violet light leakage, which not only reduces the purity of the displayed image but also further exacerbates the threat of harmful blue light to users' health. Moreover, under the current technological system, blue light protection and color gamut improvement are difficult to achieve simultaneously, often resulting in one being sacrificed for the other, failing to meet users' dual core needs for eye health and high-quality display at the same time.

[0004] Therefore, a core-shell structure quantum dot dual-band blue light blocking backlight module is needed to solve the above technical problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a core-shell structure quantum dot dual-band anti-blue light backlight module, which achieves healthy eye protection, improves image quality, meets the human eye's visual brightness requirements and color synthesis needs, and brings users a display effect that combines health and high-quality visual experience.

[0006] To achieve the above objectives, this utility model is implemented according to the following technical solution: a core-shell structure quantum dot dual-band anti-blue light backlight module, including a substrate, a driving circuit is provided on the substrate, and a light source layer, a light-emitting layer, a filter layer and a diffusion layer are sequentially arranged on the substrate from bottom to top;

[0007] The light source layer is composed of blue quantum dots, which are long-wavelength blue quantum dots (CsPbBr3).

[0008] The light-emitting layer is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene, with the red and green quantum dots uniformly dispersed in the transparent polystyrene.

[0009] The filter layer is a perovskite quantum dot core-shell structure layer, which is composed of perovskite quantum dot core-shell material (CsPbBr3 / ZnS);

[0010] The diffusion layer is composed of nanoscale polymer particles and EVA, with the nanoscale polymer particles dispersed in the EVA.

[0011] A driving circuit is set on the substrate, which serves as the circuit driving basis for the entire module. It provides stable and precise driving current and signals to the light source layer, ensuring that the light source layer can emit light normally and stably according to the preset requirements. It is the key starting point for the operation of the entire system.

[0012] The light source layer emits long-wavelength blue light driven by the substrate's driving circuit. This long-wavelength blue light is not only the initial light source for the entire backlight module, but also the excitation source for the subsequent emission of red and green quantum dots. In display applications, it, together with the light emitted by the red and green quantum dots, constitutes the three primary colors, and through combinations of different intensities, it achieves rich color display.

[0013] When the light-emitting layer is irradiated with long-wavelength blue light, the red and green quantum dots absorb energy and emit red and green light respectively.

[0014] The filter layer absorbs and converts 415-455nm blue-violet light through quantum confinement effect and band gap difference, allowing only long-wavelength blue light above 465nm and red-green photons to pass through. This greatly improves the health of the emitted light, and by filtering out unwanted light, the final output light is purer, improving the contrast and color clarity of the displayed image.

[0015] The diffusion layer uniformly mixes the three primary colors of long-wavelength blue, red, and green light, thoroughly blending the light processed by the previous layers to form a uniform and soft white light output, avoiding uneven color or light spots. It consists of nanoscale polymer particles (PMMA) dispersed within EVA. PMMA, as the core optical material, has excellent light scattering properties, capable of scattering incident light in all directions to achieve uniform light mixing. EVA disperses and fixes the PMMA particles, ensuring the stability and uniformity of the entire optical diffusion layer structure.

[0016] Preferably, the film thickness of the substrate is 3-6 mm.

[0017] Preferably, the wavelength of the blue quantum dots is 465-480nm, the particle size of the blue quantum dots is 3.5-4nm, and the film thickness of the light source layer is 30-50μm.

[0018] Preferably, the wavelength of the red quantum dots is 620-630nm and the particle size of the red quantum dots is 5-6nm, the wavelength of the green quantum dots is 520-530nm and the particle size of the green quantum dots is 2.5-3nm, and the film thickness of the light-emitting layer is 5-20μm.

[0019] Preferably, the thickness of the filter layer is 50-100 nm.

[0020] Preferably, the thickness of the diffusion layer is 10-15 μm.

[0021] Preferably, the perovskite quantum dot core-shell material is deposited on the light-emitting layer to form a filter layer, and the substrate and the light source layer, the light source layer and the light-emitting layer, and the filter layer and the diffusion layer are all bonded together by optical adhesive.

[0022] This invention also includes other components that enable the normal operation of a core-shell quantum dot dual-band blue light blocking backlight module, all of which are conventional techniques in the field. Furthermore, devices or components not specified in this invention, such as substrates, driving circuits, transparent dielectric polystyrene, blue quantum dots, red quantum dots, green quantum dots, perovskite quantum dot core-shell material (CsPbBr3 / ZnS) layers, nanoscale polymer particles (PMMA), EVA, optical adhesives, etc., all employ conventional techniques and equipment in the field.

[0023] Working Principle: By replacing blue LEDs with long-wavelength blue light quantum dots and combining them with a perovskite quantum dot core-shell structure, the proportion of harmful light intensity in the 415-455nm wavelength range is effectively reduced to <3%, significantly lowering the risk of blue light damage to the retina and providing users with a healthier visual environment. Utilizing the narrow-band light-emitting characteristics of quantum dots (half-peak width only 20-30nm) and direct three-primary-color mixing technology, the energy loss from the secondary excitation of traditional "blue light + phosphor" is avoided, significantly increasing the color gamut coverage from the original 85% to 95%, accurately reproducing rich colors. Simultaneously, by balancing blue light protection and color gamut enhancement, while ensuring the retention of essential blue light for display (approximately 40% of blue light in the 465-480nm range), the brightness requirements of human vision and color synthesis are fully met, bringing users a display effect that combines health and a high-quality visual experience, pushing display technology to new heights.

[0024] Specifically, a driving circuit is set on the substrate, which serves as the circuit driving basis for the entire module. It provides a stable and precise driving current and signal to the light source layer, ensuring that the light source layer can emit light normally and stably according to the preset requirements. This is the key starting point for the operation of the entire system.

[0025] The light source layer emits long-wavelength blue light driven by the substrate's driving circuit. This long-wavelength blue light is not only the initial light source for the entire backlight module, but also the excitation source for the subsequent emission of red and green quantum dots. In display applications, it, together with the light emitted by the red and green quantum dots, constitutes the three primary colors, and through combinations of different intensities, it achieves rich color display.

[0026] When the light-emitting layer is irradiated with long-wavelength blue light, the red and green quantum dots absorb energy and emit red and green light respectively.

[0027] The filter layer absorbs and converts 415-455nm blue-violet light through quantum confinement effect and band gap difference, allowing only long-wavelength blue light above 465nm and red-green photons to pass through. This greatly improves the health of the emitted light, and by filtering out unwanted light, the final output light is purer, improving the contrast and color clarity of the displayed image.

[0028] The diffusion layer uniformly mixes the three primary colors of long-wavelength blue, red, and green light, thoroughly blending the light processed by the previous layers to form a uniform and soft white light output, avoiding uneven color or light spots. It consists of nanoscale polymer particles (PMMA) dispersed within EVA. PMMA, as the core optical material, has excellent light scattering properties, capable of scattering incident light in all directions to achieve uniform light mixing. EVA disperses and fixes the PMMA particles, ensuring the stability and uniformity of the entire optical diffusion layer structure.

[0029] Compared with the defects of traditional backlight modules in the existing technology: (1) Problems with the light emission mechanism of traditional backlight modules. Traditional backlight modules with dual-band quantum dot excitation system rely on blue LED to excite phosphor (such as YAG yellow phosphor) to generate white light. This process has two major defects. One is the problem of harmful blue light leakage. The main peak of blue LED is about 450nm, which easily releases 415-455nm blue-violet light (accounting for about 20-30%). The other is the problem of limited color gamut. Due to the energy level transition characteristics of phosphor materials, the phosphor spectrum is broadened, resulting in insufficient color purity. The Rec.2020 color gamut is usually <85%. (2) Traditional backlight modules have the problem of blue-violet light leakage. Traditional quantum dots have surface defect states, which make electron-hole pairs easy to undergo nonradiative recombination, resulting in the leakage of short-wavelength stray light (415-455nm blue-violet light). (3) It is difficult to balance the protection of blue light and the improvement of color gamut. Reducing the intensity of blue light may affect the excitation efficiency, while improving the color gamut requires the participation of specific wavelengths of blue light. There is a natural contradiction between the two. Traditional backlight modules cannot achieve the goals of healthy eye protection and high-quality display at the same time, which makes it difficult to meet the growing demand of users for high-performance display devices.

[0030] This utility model has the following beneficial effects:

[0031] I. Eye Health Protection: By replacing blue LEDs with long-wavelength blue quantum dots (wavelength 465-480nm), combined with a filter layer of perovskite quantum dot core-shell structure (CsPbBr3 / ZnS), the harmful blue-violet light is absorbed and converted by utilizing the quantum confinement effect and band gap difference, reducing the proportion of harmful light intensity in the 415-455nm band to <3%, greatly reducing the damage of blue light to the retina;

[0032] II. Improved image quality: (1) Significantly widened color gamut: Utilizing the narrow-band light emission characteristics of quantum dots (half-peak width of only 20-30nm), and adopting direct three-primary-color mixing technology, the color gamut coverage is increased to 95%, which can accurately reproduce rich colors and meet the requirements of high-end display scenarios for color accuracy. (2) More uniform light and color mixing: The diffusion layer is composed of nano-scale polymer particles (PMMA), which can uniformly mix the three primary colors to form white light output, improve the consistency of viewing angle. Compared with some traditional technologies that do not have a specially designed uniform light mixing structure, the color and brightness of the picture are more uniform when viewed from different angles;

[0033] Third, it has technological synergy:

[0034] (1) Blocking harmful wavelengths: Long-wavelength blue quantum dots themselves do not generate 415-455nm light. The perovskite quantum dot core-shell structure further absorbs / converts any potentially leaked short-wavelength stray light, making the intensity of this wavelength band less than 3% (compared to about 20% in traditional schemes). (2) Retention of essential blue light for display: 465-480nm blue light (accounting for about 40%) is used to excite red and green quantum dots, while simultaneously meeting the visual brightness requirements of the human eye (cone cells are most sensitive to 555nm green light, but require blue light to participate in color perception synthesis). This synergistic effect ensures that leaked short-wavelength stray light is absorbed while meeting the visual brightness requirements of the human eye. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a schematic diagram of the structure of a core-shell quantum dot dual-band anti-blue light backlight module according to embodiments 1-3 of this utility model;

[0037] Figure 2 This is a flowchart illustrating the fabrication process of a core-shell structure quantum dot dual-band anti-blue light backlight module according to embodiments 1-3 of this utility model.

[0038] In the diagram: 1. Substrate; 2. Light source layer; 3. Light-emitting layer; 4. Filter layer; 5. Diffusion layer. Detailed Implementation

[0039] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, this utility model provides a core-shell structure quantum dot dual-band anti-blue light backlight module, including a substrate 1, on which a driving circuit is provided, and the film thickness of the substrate 1 is 3mm; from bottom to top, a light source layer 2, a light-emitting layer 3, a filter layer 4 and a diffusion layer 5 are sequentially arranged on the substrate 1.

[0042] The light source layer 2 is composed of blue quantum dots, which are long-wavelength blue quantum dots (CsPbBr3). The wavelength of the blue quantum dots is 465-480nm, the particle size of the blue quantum dots is 3.5-4nm, and the film thickness of the light source layer 2 is 30μm.

[0043] The light-emitting layer 3 is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene. The red and green quantum dots are uniformly dispersed in the transparent polystyrene. The wavelength of the red quantum dots is 620-630 nm, and the particle size is 5-6 nm. The wavelength of the green quantum dots is 520-530 nm, and the particle size is 2.5-3 nm. The film thickness of the light-emitting layer 3 is 5 μm.

[0044] The filter layer 4 is a perovskite quantum dot core-shell structure layer, which is made of perovskite quantum dot core-shell material (CsPbBr3 / ZnS). The film thickness of the filter layer 4 is 50nm.

[0045] The diffusion layer 5 is composed of nanoscale polymer particles and EVA, with the nanoscale polymer particles dispersed in the EVA. The film thickness of the diffusion layer 5 is 10 μm.

[0046] The perovskite quantum dot core-shell material is deposited on the light-emitting layer 3 to form a filter layer 4. The substrate 1 and the light source layer 2, the light source layer 2 and the light-emitting layer 3, and the filter layer 4 and the diffusion layer 5 are all bonded together with optical adhesive.

[0047] A driving circuit is set on the substrate 1, which serves as the circuit driving basis for the entire module. It provides stable and precise driving current and signals to the light source layer 2, ensuring that the light source layer 2 can emit light normally and stably according to the preset requirements. It is the key starting link for the operation of the entire system.

[0048] The light source layer 2 is driven by the driving circuit of the substrate 1 to emit long-wavelength blue light. This long-wavelength blue light is not only the initial light source for the entire backlight module, but also the excitation source for the subsequent emission of red and green quantum dots. In display applications, it, together with the light emitted by the red and green quantum dots, constitutes the three primary colors. Through combinations of different intensities, rich colors can be displayed.

[0049] When the luminescent layer 3 is irradiated with long-wavelength blue light, the red and green quantum dots absorb energy and emit red and green light respectively.

[0050] Filter layer 4 absorbs and converts 415-455nm blue-violet light through quantum confinement effect and band gap difference, allowing only long-wavelength blue light above 465nm and red-green photons to pass through. This greatly improves the health of the emitted light, and by filtering out unwanted light, the final output light is purer, improving the contrast and color clarity of the displayed image.

[0051] The diffusion layer 5 uniformly mixes the three primary colors of long-wavelength blue, red, and green light, thoroughly mixing the light processed by the above layers to form a uniform and soft white light output, avoiding uneven color or light spots. It is composed of nanoscale polymer particles (PMMA) dispersed in EVA. PMMA, as the core optical material, has excellent light scattering properties, capable of scattering incident light in all directions to achieve uniform light mixing. EVA serves to disperse and fix the PMMA particles, ensuring the stability and uniformity of the entire optical diffusion layer 5 structure.

[0052] Example 2

[0053] like Figure 1 As shown, this utility model provides a core-shell structure quantum dot dual-band anti-blue light backlight module, including a substrate 1, on which a driving circuit is provided, and the film thickness of the substrate 1 is 4.5mm; from bottom to top, a light source layer 2, a light-emitting layer 3, a filter layer 4 and a diffusion layer 5 are sequentially arranged on the substrate 1.

[0054] The light source layer 2 is composed of blue quantum dots, which are long-wavelength blue quantum dots (CsPbBr3). The wavelength of the blue quantum dots is 465-480nm, the particle size of the blue quantum dots is 3.5-4nm, and the film thickness of the light source layer 2 is 40μm.

[0055] The light-emitting layer 3 is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene. The red and green quantum dots are uniformly dispersed in the transparent polystyrene. The wavelength of the red quantum dots is 620-630 nm, and the particle size is 5-6 nm. The wavelength of the green quantum dots is 520-530 nm, and the particle size is 2.5-3 nm. The film thickness of the light-emitting layer 3 is 12.5 μm.

[0056] The filter layer 4 is a perovskite quantum dot core-shell structure layer, which is made of perovskite quantum dot core-shell material (CsPbBr3 / ZnS). The film thickness of the filter layer 4 is 70nm.

[0057] The diffusion layer 5 is composed of nanoscale polymer particles and EVA, with the nanoscale polymer particles dispersed in the EVA. The film thickness of the diffusion layer 5 is 12.5 μm.

[0058] The perovskite quantum dot core-shell material is deposited on the light-emitting layer 3 to form a filter layer 4. The substrate 1 and the light source layer 2, the light source layer 2 and the light-emitting layer 3, and the filter layer 4 and the diffusion layer 5 are all bonded together with optical adhesive.

[0059] A driving circuit is set on the substrate 1, which serves as the circuit driving basis for the entire module. It provides stable and precise driving current and signals to the light source layer 2, ensuring that the light source layer 2 can emit light normally and stably according to the preset requirements. It is the key starting link for the operation of the entire system.

[0060] The light source layer 2 is driven by the driving circuit of the substrate 1 to emit long-wavelength blue light. This long-wavelength blue light is not only the initial light source for the entire backlight module, but also the excitation source for the subsequent emission of red and green quantum dots. In display applications, it, together with the light emitted by the red and green quantum dots, constitutes the three primary colors. Through combinations of different intensities, rich colors can be displayed.

[0061] When the luminescent layer 3 is irradiated with long-wavelength blue light, the red and green quantum dots absorb energy and emit red and green light respectively.

[0062] Filter layer 4 absorbs and converts 415-455nm blue-violet light through quantum confinement effect and band gap difference, allowing only long-wavelength blue light above 465nm and red-green photons to pass through. This greatly improves the health of the emitted light, and by filtering out unwanted light, the final output light is purer, improving the contrast and color clarity of the displayed image.

[0063] The diffusion layer 5 uniformly mixes the three primary colors of long-wavelength blue, red, and green light, thoroughly mixing the light processed by the above layers to form a uniform and soft white light output, avoiding uneven color or light spots. It is composed of nanoscale polymer particles (PMMA) dispersed in EVA. PMMA, as the core optical material, has excellent light scattering properties, capable of scattering incident light in all directions to achieve uniform light mixing. EVA serves to disperse and fix the PMMA particles, ensuring the stability and uniformity of the entire optical diffusion layer 5 structure.

[0064] Example 3

[0065] like Figure 1 As shown, this utility model provides a core-shell structure quantum dot dual-band anti-blue light backlight module, including a substrate 1, on which a driving circuit is provided, and the film thickness of the substrate 1 is 6mm; from bottom to top, a light source layer 2, a light-emitting layer 3, a filter layer 4 and a diffusion layer 5 are sequentially arranged on the substrate 1.

[0066] The light source layer 2 is composed of blue quantum dots, which are long-wavelength blue quantum dots (CsPbBr3). The wavelength of the blue quantum dots is 465-480nm, the particle size of the blue quantum dots is 3.5-4nm, and the film thickness of the light source layer 2 is 50μm.

[0067] The light-emitting layer 3 is composed of red quantum dots (CsPbBr3), green quantum dots (CsPbBr3), and transparent polystyrene. The red and green quantum dots are uniformly dispersed in the transparent polystyrene. The wavelength of the red quantum dots is 620-630 nm, and the particle size is 5-6 nm. The wavelength of the green quantum dots is 520-530 nm, and the particle size is 2.5-3 nm. The film thickness of the light-emitting layer 3 is 20 μm.

[0068] The filter layer 4 is a perovskite quantum dot core-shell structure layer, which is made of perovskite quantum dot core-shell material (CsPbBr3 / ZnS). The film thickness of the filter layer 4 is 100nm.

[0069] The diffusion layer 5 is composed of nanoscale polymer particles and EVA, with the nanoscale polymer particles dispersed in the EVA. The film thickness of the diffusion layer 5 is 15 μm.

[0070] The perovskite quantum dot core-shell material is deposited on the light-emitting layer 3 to form a filter layer 4. The substrate 1 and the light source layer 2, the light source layer 2 and the light-emitting layer 3, and the filter layer 4 and the diffusion layer 5 are all bonded together with optical adhesive.

[0071] A driving circuit is set on the substrate 1, which serves as the circuit driving basis for the entire module. It provides stable and precise driving current and signals to the light source layer 2, ensuring that the light source layer 2 can emit light normally and stably according to the preset requirements. It is the key starting link for the operation of the entire system.

[0072] The light source layer 2 is driven by the driving circuit of the substrate 1 to emit long-wavelength blue light. This long-wavelength blue light is not only the initial light source for the entire backlight module, but also the excitation source for the subsequent emission of red and green quantum dots. In display applications, it, together with the light emitted by the red and green quantum dots, constitutes the three primary colors. Through combinations of different intensities, rich colors can be displayed.

[0073] When the luminescent layer 3 is irradiated with long-wavelength blue light, the red and green quantum dots absorb energy and emit red and green light respectively.

[0074] Filter layer 4 absorbs and converts 415-455nm blue-violet light through quantum confinement effect and band gap difference, allowing only long-wavelength blue light above 465nm and red-green photons to pass through. This greatly improves the health of the emitted light, and by filtering out unwanted light, the final output light is purer, improving the contrast and color clarity of the displayed image.

[0075] The diffusion layer 5 uniformly mixes the three primary colors of long-wavelength blue, red, and green light, thoroughly mixing the light processed by the above layers to form a uniform and soft white light output, avoiding uneven color or light spots. It is composed of nanoscale polymer particles (PMMA) dispersed in EVA. PMMA, as the core optical material, has excellent light scattering properties, capable of scattering incident light in all directions to achieve uniform light mixing. EVA serves to disperse and fix the PMMA particles, ensuring the stability and uniformity of the entire optical diffusion layer 5 structure.

[0076] The core-shell structure quantum dot dual-band blue light blocking backlight module fabricated in the above embodiments achieves a dual breakthrough in eye health and high-definition display. By using long-wavelength blue light quantum dots to replace blue light LEDs and combining them with an innovatively designed perovskite quantum dot core-shell structure filter layer, the proportion of harmful light intensity in the 415-455nm band is effectively reduced to <3%, significantly reducing the risk of blue light damage to the retina and providing users with a healthier visual environment. Utilizing the narrow-band light-emitting characteristics of quantum dots (half-peak width of only 20-30nm) and direct three-primary-color mixing technology, the energy loss of secondary excitation in traditional "blue light + phosphor" is avoided, significantly increasing the color gamut coverage from the original 85% to 95%, accurately reproducing rich colors. At the same time, through optimized design, the blue light blocking and color gamut improvement effects are balanced. While ensuring the retention of the necessary blue light for display (approximately 40% of blue light in the 465-480nm range), the module fully meets the human eye's visual brightness requirements and color synthesis needs, bringing users a display effect that combines health and a high-quality visual experience, pushing display technology to new heights.

[0077] like Figure 2 As shown in Examples 1-3 above, the fabrication process of a core-shell structure quantum dot dual-band anti-blue light backlight module mainly includes: Step 1, coating and fabricating a light source layer and an emitting layer; Step 2, depositing a filter layer; Step 3, coating a diffusion layer; Step 4, assembly; Step 5, testing.

[0078] Step one is performed in a laboratory environment under normal temperature and pressure. First, quantum dots emitting a specific wavelength of light—465-480nm long-wavelength blue quantum dots—are placed in the organic solvent EVA and ultrasonically dispersed at a frequency of 80kHz for approximately 30 minutes. Then, the dispersed material is spin-coated to form a light source layer. The spin-coating speed is adjusted according to the required film thickness of the light source layer, generally 5000 rpm. After spin-coating, a thermosetting treatment is performed, with the curing temperature controlled at 110-120℃ for 30-120 minutes, to ensure that the long-wavelength blue quantum dots are firmly adhered to the substrate and that the organic solvent is properly dissolved. After thorough evaporation, red quantum dots with wavelengths of 620-630nm and green quantum dots with wavelengths of 520-530nm are placed in the organic solvent EVA and ultrasonically dispersed at a frequency of 80kHz for about 30 minutes. The dispersed material is then spin-coated to form a light-emitting layer. The spin-coating speed is adjusted according to the required film thickness of the light-emitting layer, generally 5000r / min. After spin-coating, a heat curing treatment is performed, with the curing temperature controlled at 110-120℃ for 30-120 minutes, to ensure that the long red and green quantum dots adhere firmly and that the organic solvent evaporates completely.

[0079] Step two is carried out in a glove box under inert gas (argon) protection to prevent oxidation or moisture absorption of the raw materials. The reaction temperature is controlled at room temperature -80°C, and the reaction time is several hours to more than ten hours. CVD deposition is used, and the reaction chamber must first be evacuated to a vacuum state with a pressure of 10... -3 -10 -5 The deposition temperature is selected between 100-500℃ depending on the specific materials and equipment. The gas flow rate is precisely controlled, with the carrier gas (such as nitrogen) flow rate generally between 50-500 sccm (standard cubic centimeters per minute), and the reaction gas flow rate adjusted according to the reaction requirements. After reacting the metal halides (such as CsBr, PbBr2), sulfur source (such as ZnS precursor), and organic ligands (used to control the reaction and stabilize the quantum dots, such as oleic acid and oleylamine) required for preparing perovskite quantum dot core-shell materials (CsPbBr3 / ZnS) in the reaction chamber to form the perovskite quantum dot core-shell material, it is deposited on the luminescent layer to form a filter layer.

[0080] In step three, nanoscale polymer particles (PMMA) are first mixed and stirred with EVA at room temperature and pressure, followed by ultrasonic treatment. The stirring speed is controlled at 1000 r / min, the ultrasonic treatment frequency is 50 kHz, and the time is 30 min, ensuring that the nanoscale polymer particles (PMMA) are uniformly dispersed in the EVA. The desired diffusion layer thickness is then achieved by spin coating at a speed ranging from 3000 r / min. After spin coating, a thermosetting treatment is performed at a temperature controlled at 110-120℃ for 30-120 min.

[0081] Step four is carried out in a clean environment to avoid dust and other impurities affecting the module performance. The cleanliness level is required to reach Class 10,000 or higher. The substrate and the layers prepared in steps one to three are bonded together with conductive photoresist.

[0082] Step 5 involves comprehensive testing of the assembled core-shell structure quantum dot dual-band anti-blue light backlight module. During electrical performance testing, a stable power supply is provided, and parameters such as voltage and current are set according to the module design requirements. Optical performance testing is conducted in a dark room environment to eliminate external light interference, and the testing equipment must be calibrated to ensure accuracy.

[0083] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A core-shell structure quantum dot dual-band anti-blue light backlight module, comprising a substrate, wherein a driving circuit is provided on the substrate, characterized in that: The substrate is provided with a light source layer, a light emission layer, a filter layer and a diffusion layer from bottom to top; The light source layer is composed of blue quantum dots with a particle size of 3.5-4 nm and a film thickness of 30-50 μm. The light-emitting layer is composed of red quantum dots, green quantum dots and transparent polystyrene. The particle size of the red quantum dots is 5-6 nm, the particle size of the green quantum dots is 2.5-3 nm, the film thickness of the light-emitting layer is 5-20 μm, and the red and green quantum dots are uniformly dispersed in the transparent polystyrene. The filter layer is a perovskite quantum dot core-shell structure layer, and the film thickness of the filter layer is 50-100nm. The diffusion layer is composed of nanoscale polymer particles PMMA and EVA, and the film thickness of the diffusion layer is 10-15 μm. The nanoscale polymer particles PMMA are dispersed in EVA.

2. The core-shell structure quantum dot dual-band anti-blue light backlight module according to claim 1, characterized in that: The film thickness of the substrate is 3-6 mm.

3. The core-shell structure quantum dot dual-band anti-blue light backlight module according to claim 1, characterized in that: The wavelength of the blue quantum dots is 465-480nm.

4. The core-shell structure quantum dot dual-band anti-blue light backlight module according to claim 1, characterized in that: The wavelength of the red quantum dots is 620-630nm, and the wavelength of the green quantum dots is 520-530nm.

5. A core-shell structure quantum dot dual-band anti-blue light backlight module according to claim 1, characterized in that: The perovskite quantum dot core-shell material is deposited on the light-emitting layer to form a filter layer. The substrate and the light source layer, the light source layer and the light-emitting layer, and the filter layer and the diffusion layer are all bonded together with optical adhesive.

Images