Backlight module, preparation method of backlight module and display equipment of backlight module

Abstract

The invention relates to a backlight module, a preparation method of the backlight module and display equipment of the backlight module, and the backlight module comprises a backlight source which is provided with a light emitting side; the optical element is located on the light emitting side and used for receiving light emitted by the backlight source; the optical element comprises a lens and a first fluorescent layer, and the first fluorescent layer is arranged in the lens; the lens is arranged to change the propagation path of the light, and the first fluorescent layer is arranged to absorb part of the light, so that the light penetrating through the optical element is white. The first fluorescent layer is far away from the light-emitting chip, stripping of the backlight source from the first fluorescent layer is achieved, the first fluorescent layer is not affected by temperature rise of the light-emitting chip, the working temperature of the first fluorescent layer is greatly reduced, reliability is remarkably improved, and the service life is remarkably prolonged. And the first fluorescent layer is combined with the lens and is sealed in a very closed space, so that the first fluorescent layer is successfully prevented from being combined with water and oxygen in the air and is not limited by driving current, and a high-color-gamut and low-cost backlight scheme is realized.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module, a method for preparing the backlight module, and a display device thereof. Background Art

[0002] With the continuous advancement of display technology, the TV market has formed three major categories: Liquid Crystal Display (LCD) TV, Organic Light-Emitting Diode (OLED) TV and Micro Light Emitting Diode (Micro LED) direct display TV. Although Micro LED direct display TV has many technical advantages, such as high brightness, high contrast, and long life, its commercialization process is still relatively slow because technical problems such as thin film, miniaturization, array and mass transfer yield of LED lamp beads have not been completely solved. Therefore, its market share is relatively small. According to data, LCD TV has a larger market share.

[0003] In the comparison between LCD TV and OLED TV, a significant disadvantage of LCD TV is that its color gamut performance is not as good as OLED TV. This is mainly because the LCD panel itself does not have the ability to emit light, but relies on the LED backlight system behind it to emit white light, which then penetrates the LCD panel to form a visible image. Therefore, the spectral characteristics of the backlight system have a decisive influence on the color gamut performance of LCD TV.

[0004] At present, the backlight system of LCD TV mainly adopts two schemes to achieve white light output. One is to encapsulate the blue light-emitting chip with yttrium aluminum garnet (YAG) phosphor, and produce white light by mixing blue light and yellow light. However, the spectrum of this scheme lacks pure red and green light components, resulting in a low color gamut of the display. Another scheme is to encapsulate the blue light-emitting chip with β-Sialon (nitride beta-sialon) and potassium fluorosilicate (K2SiF6, KSF) phosphor containing tetravalent manganese ions, where β-Sialon is excited by blue light to emit green light, and KSF is excited by blue light to emit red light. This scheme can produce relatively pure green and red light, thereby significantly improving the color gamut of the display, making it close to the color gamut level of OLED TV.

[0005] However, the high color gamut LED solution also has certain technical defects. In particular, the KSF phosphor has relatively poor water and oxygen resistance and thermal stability. According to the Arrhenius model, the luminous flux of the LED will decrease with the increase of the operating current and the increase of the junction temperature, which will shorten the life of the LED. In order to ensure that the KSF solution has the same LED life as the YAG solution, the driving current of the KSF solution needs to be reduced in actual applications, which is only about 75% of the driving current of the YAG solution. Although this measure can extend the life of the LED, it requires increasing the number of LEDs to compensate for the loss of driving current, which significantly increases the backlight cost of the high color gamut solution.

[0006] In summary, although high color gamut LCD TVs have made breakthroughs in color gamut performance, the technical difficulties and cost issues behind them still limit their further market penetration. Therefore, how to reduce production costs and increase product life while ensuring color gamut performance is still a key issue that needs to be solved in the development of LCD TV technology. Summary of the invention

[0007] The present application provides a backlight module, a method for preparing the backlight module and a display device thereof, which can extend the service life of the product and reduce the production cost.

[0008] In a first aspect, the present application provides a backlight module, comprising:

[0009] A backlight source having a light emitting side; and

[0010] An optical element, located at the light-emitting side, and used to receive the light emitted by the backlight source; wherein the optical element comprises a lens and a first fluorescent layer, and the first fluorescent layer is arranged in the lens;

[0011] The lens is configured to change the propagation path of light, and the first fluorescent layer is configured to absorb part of the light, so that the light passing through the optical element appears white.

[0012] In a possible implementation manner, the lens is provided with a receiving cavity, and the first fluorescent layer is provided in the receiving cavity.

[0013] In a possible implementation manner, the first fluorescent layer is doped into the lens.

[0014] In a possible implementation manner, the optical element includes at least one supporting column, and the supporting column is disposed on a side of the lens close to the backlight source.

[0015] In a possible implementation, the backlight source includes a light-emitting chip, a second fluorescent layer and a lamp housing, the light-emitting chip is installed in the lamp housing, and the second fluorescent layer is arranged in the lamp housing and covers the light-emitting chip.

[0016] In a possible implementation, the first fluorescent layer includes KSF fluorescent powder, and the second fluorescent layer includes β-Sialon fluorescent powder.

[0017] In a second aspect, the present application provides a method for preparing a backlight module, which is used to prepare the backlight module as described in the first aspect, and the method comprises:

[0018] Providing a backlight source, the backlight source having a light emitting side;

[0019] An optical element is injection molded on the light-emitting side, and the optical element is used to receive the light emitted by the backlight source; wherein the optical element includes a lens and a first fluorescent layer, and the first fluorescent layer is arranged in the lens;

[0020] The lens is configured to change the propagation path of light, and the first fluorescent layer is configured to absorb part of the light, so that the light passing through the optical element appears white.

[0021] In a possible implementation, injection molding an optical element on the light-emitting side includes:

[0022] Providing a first prefabricated mold, wherein the first prefabricated mold reserves a position for a receiving cavity; wherein the receiving cavity has an open end;

[0023] Injecting molten transparent particles into the first prefabricated mold to fill the area outside the accommodating cavity reserved by the prefabricated mold;

[0024] Cooling and demoulding to form a lens having the accommodating cavity;

[0025] Filling the accommodating cavity with colloidal first fluorescent particles through the opening end to form a first fluorescent layer;

[0026] The open end is sealed to obtain the optical element.

[0027] In a third aspect, the present application provides a display device, including a liquid crystal panel and a backlight module as described in the first aspect.

[0028] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0029] The backlight module, the method for preparing the backlight module and the display device provided by the embodiment of the present application, the first fluorescent layer is far away from the light-emitting chip, and the peeling between the backlight source and the first fluorescent layer is realized. The first fluorescent layer will not be affected by the temperature rise of the light-emitting chip, the working temperature of the first fluorescent layer is greatly reduced, and the reliability and service life are significantly improved. In addition, the first fluorescent layer is combined with the lens and is enclosed in a very closed space, which successfully blocks the first fluorescent layer from combining with water and oxygen in the air. It is not limited by the driving current and can make up for the energy loss caused by the decrease of the driving current in the related art. Compared with the backlight module in the related art, the backlight module in the present application can reduce its cost by at least 25%, which can realize a high color gamut and low-cost backlight solution and improve the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 A cross-sectional schematic diagram of a backlight module provided in an embodiment of the present application;

[0034] Figure 2 A flowchart of a method for preparing a backlight module provided in an embodiment of the present application;

[0035] Figure 3 A flowchart of a method for preparing a backlight module provided in an embodiment of the present application;

[0036] Figure 4 A flowchart of a method for preparing a backlight module provided in an embodiment of the present application;

[0037] Figure 5 A flowchart of a method for preparing a backlight module provided in an embodiment of the present application;

[0038] Figure 6 A block diagram of a display device provided in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Backlight source; 11. Light emitting side; 12. Second fluorescent layer; 13. Lamp housing; 14. Light emitting chip; 2. Optical element; 21. Lens; 211. Light emitting surface; 212. Light incident surface; 22. First fluorescent layer; 23. Support column; 100. Liquid crystal panel; 200. Backlight module. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0043] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0044] First embodiment

[0045] Figure 1 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application

[0046] The embodiment of the present application provides a backlight module, which is applied to electronic devices with display functions, such as mobile phones, tablet computers, portable computers, televisions, monitors, etc. The backlight module includes a backlight source 1 and an optical element 2. The backlight source 1 can emit light and irradiate the optical element 2. The backlight source 1 is used to emit light. The optical element 2 can optically convert the light emitted by the backlight source 1, and then emit white light to meet the display imaging requirements of the electronic device. It can be understood that the backlight module is not limited to including the above-mentioned backlight source 1 and optical element 2, but can also include a substrate, etc. The backlight source 1 and the optical element 2 are arranged on the substrate to improve the stability of the backlight module.

[0047] The backlight source 1 has a light emitting side 11 for emitting light to illuminate the optical element 2 .

[0048] The optical element 2 is located on the light-emitting side 11 so as to receive the light emitted by the backlight source 1 and then realize optical conversion to generate the required white light. The optical element 2 includes a lens 21 and a first fluorescent layer 22. The first fluorescent layer 22 is arranged in the lens 21. The first fluorescent layer 22 is, for example, a colloidal first fluorescent particle. The first fluorescent layer 22 is separated from the backlight source 1 to avoid the temperature of the backlight source 1 from increasing and affecting the stability of the first fluorescent layer 22. The first fluorescent layer 22 is away from the heat source of the backlight source 1, and its operating temperature is greatly reduced, which improves the reliability of the backlight module and prolongs the service life of the first fluorescent layer 22 and the backlight module as a whole.

[0049] First example

[0050] The lens 21 is provided with a receiving cavity (not shown in the figure), and the lens 21 adopts a hemispherical shape and is formed by injection molding. During the molding process, a hollow interlayer is provided inside the lens 21 to form a receiving cavity. The receiving cavity is used to set the first fluorescent layer 22 and ensure that it can stably receive the light emitted by the backlight source 1. Among them, the shape of the receiving cavity can also be a hemispherical shape, so as to receive the light emitted by the backlight source 1. One end of the receiving cavity is closed and the other end is open, so as to fill the colloidal first fluorescent particles. After the filling is completed, it is sealed to achieve the stability of the first fluorescent layer 22.

[0051] Second example

[0052] The first fluorescent layer 22 is doped into the lens 21. When the lens 21 is injection molded, the first fluorescent layer 22, such as the first fluorescent powder, is fully stirred and mixed with the injection molding material of the lens 21, so that the first fluorescent layer 22 is evenly distributed in the lens 21, thereby improving the overall sealing performance and being able to more effectively block water and oxygen from the first fluorescent layer 22.

[0053] The lens 21 is configured to change the propagation path of the light, and the lens 21 is hemispherical in shape. The light can undergo optical conversions such as reflection, refraction, and transmission through the lens 21. The first fluorescent layer 22 is configured to absorb part of the light, and emit red light under the excitation of the light from the backlight source 1, which is combined with the blue-green mixed light generated by the backlight source 1, so that the light passing through the optical element 2 is white, achieving a backlight output with a high color gamut of white.

[0054] In this embodiment, if Figure 1 As shown, the lens 21 is provided with a light emitting surface 211 and a light incident surface 212. The light incident surface 212 is a concave surface and is arranged opposite to the backlight source 1 so as to receive the light emitted by the backlight source 1. Among them, the light emitting surface 211 is a curved surface, which can scatter light to achieve the function of lighting or luminescence.

[0055] In this embodiment, if Figure 1 As shown, the optical element 2 includes a support column 23, and the support column 23 is arranged on the side of the lens 21 close to the backlight source 1. The support column 23 is used to support the lens 21, which not only enhances the structural stability of the lens 21 and ensures that the lens 21 can be stably arranged on the substrate, but also further ensures the relative position accuracy between the optical element 2 and the backlight source 1, reduces the risk of misalignment caused by vibration or external force, and thus improves the assembly stability and overall performance of the backlight module. Among them, the support column 23 can be one or more, and the multiple support columns 23 are arranged around the lens 21 to improve balance and stability.

[0056] In this embodiment, if Figure 1 As shown, the backlight source 1 includes a light emitting chip 14 , a second fluorescent layer 12 and a lamp housing 13 . The light emitting chip 14 is installed in the lamp housing 13 . The second fluorescent layer 12 is arranged in the lamp housing 13 and covers the light emitting chip 14 .

[0057] The light emitting chip 14 is, for example, a blue chip that can emit high-intensity blue light. The second fluorescent layer 12 is a colloidal β-Sialon that can combine with the light emitting chip 14 to produce blue-green mixed light, which, in conjunction with the red light of the first fluorescent layer 22, realizes a backlight module with a high white color gamut, significantly improving the color richness and accuracy of the displayed image.

[0058] The lamp housing 13 provides a stable installation environment for the light emitting chip 14 and the second fluorescent layer 12, ensuring effective emission and transmission of light.

[0059] The backlight module of the embodiment of the present application realizes efficient optical conversion and stable white light output, and meets the requirements of modern electronic devices for high color gamut and long life backlight modules. The first fluorescent layer 22 can be filled and sealed in the accommodating cavity, or the fluorescent layer can be directly doped into the lens material for injection molding. Both methods have high manufacturing flexibility and operability, and are convenient for selecting a suitable production process according to actual needs, reducing production costs and improving production efficiency.

[0060] When the light emitting chip 14 of the backlight source 1 emits blue light, the light will first irradiate the second fluorescent layer 12 to generate blue-green mixed light. Then, the light will pass through the lens 21 and irradiate the first fluorescent layer 22. Under the action of the first fluorescent layer 22, part of the light will be absorbed and stimulated to emit red light. Finally, the blue-green mixed light is combined with the red light to form a white high color gamut light output.

[0061] The backlight module in this embodiment, by peeling off the backlight source 1 and the first fluorescent layer 22, effectively reduces the operating temperature of the first fluorescent layer 22, thereby improving the stability and reliability of the backlight module. This helps to extend the service life of the first fluorescent layer 22 and the backlight module as a whole. The innovative design of the optical element 2 enables efficient optical conversion of light when passing through the lens 21 and the first fluorescent layer 22. This not only improves the utilization rate of light, but also ensures the output of white high color gamut. The backlight module provided in this embodiment has the characteristics of efficient optical conversion, stable white light output and optimized structural design, so that the backlight module has a wide range of application prospects and market demand in modern electronic devices.

[0062] Second embodiment

[0063] Figure 2 A flow chart of a method for preparing a backlight module provided in an embodiment of the present application.

[0064] The present invention provides a backlight module, comprising the following steps:

[0065] S100: Provide a backlight source.

[0066] In step S100, Figure 1 As shown, the backlight source 1 has a light emitting side 11 for emitting light to the outside.

[0067] Among them, Figure 3 As shown, the step of "providing a backlight source" in step S100 also includes the following steps:

[0068] S1001. Provide light-emitting chips and lamp housings.

[0069] In step S1001, a high-quality light-emitting chip 14 is selected, which can emit light of a specific wavelength (such as blue light). At the same time, a lamp housing 13 is prepared, which is designed with an internal space for accommodating the light-emitting chip 14 and has good sealing and heat dissipation performance.

[0070] The performance of the light emitting chip 14, as the core component of the backlight source 1, directly affects the light output efficiency and stability of the backlight module. The lamp housing 13 provides necessary protection and support to ensure the safety and reliability of the light emitting chip 14 during operation.

[0071] S1002, filling the lamp housing with colloidal second fluorescent particles to form a second fluorescent layer.

[0072] In step S1002, the pre-prepared colloidal second fluorescent particles are uniformly filled into the lamp housing 13 and covered on the surface of the light-emitting chip 14. The fluorescent particles are tightly combined with the material in the lamp housing 13 through an appropriate process (such as heating and curing) to form the second fluorescent layer 12. The colloidal second fluorescent particles are, for example, β-Sialon fluorescent powder added to organic silica gel and stirred. Alternatively, the colloidal second fluorescent particles are, for example, YAG yellow powder, β-Sialon green powder and organic silica gel frame stirred.

[0073] The second fluorescent layer 12 can absorb the light emitted by the light emitting chip 14 and convert it into light of another wavelength (such as green light), thereby achieving color conversion and mixing of the light. The second fluorescent particles have excellent luminous performance and stability, and can significantly improve the light output quality and color uniformity of the backlight module.

[0074] S110, injection molding an optical element on the light emitting side.

[0075] In step S110, Figure 1 As shown, an optical element 2 is injection molded on the light-emitting side 11 , and the optical element 2 is used to receive and process the light emitted by the backlight source 1 . The optical element 2 includes a lens 21 and a first fluorescent layer 22 , and the first fluorescent layer 22 is disposed in the lens 21 .

[0076] According to the design requirements, a suitable lens material is selected and a proper amount of the first fluorescent layer material (such as fluorescent powder) is added thereto. Then, the lens material is injected into the mold of the light-emitting side 11 by an injection molding process, and a lens 21 including the first fluorescent layer 22 is formed during the curing process.

[0077] The lens 21 is configured to change the propagation path of the light, such as focusing, diffusion or refraction, so as to achieve precise control and optimization of the light. The first fluorescent layer 22 is configured to absorb part of the light and convert it into light of another wavelength (such as red light), which is mixed with the light converted by the second fluorescent layer 12, and finally makes the light passing through the optical element 2 present a uniform white color. This design not only improves the light output efficiency and color accuracy of the backlight module, but also enhances its visual effect and user experience.

[0078] First example

[0079] Among them, Figure 4 As shown, in step S110, "injection molding an optical element on the light-emitting side" further includes the following steps:

[0080] 1101. Provide a first prefabricated mold.

[0081] In step S1101, a high-precision first prefabricated mold is prepared. The first prefabricated mold reserves a position for a receiving cavity, and the receiving cavity has an open end for subsequent filling of fluorescent particles. The material of the first prefabricated mold should have good heat resistance and corrosion resistance to ensure the smooth progress of the injection molding process.

[0082] By precisely designing the shape and size of the mold, it can be ensured that the final molded optical component has the required shape and dimensional accuracy.

[0083] 1102. Inject molten transparent particles into the first prefabricated mold to fill the area outside the accommodating cavity reserved in the prefabricated mold.

[0084] In step S1102, the prepared molten transparent particles (such as optical grade transparent resin) are injected into the first prefabricated mold. These transparent particles will fill the area outside the reserved accommodation cavity of the first prefabricated mold to form the main body of the lens. The transparent particles are, for example, PMMA, i.e. polymethyl methacrylate, which has good transparency, chemical stability and weather resistance, and is easy to process.

[0085] The selection of transparent particles and the control of the injection molding process are based on actual needs. They are crucial to the transparency and optical performance of the lens. By optimizing these parameters, it is possible to ensure that the lens has excellent optical properties. For example, the heating temperature of PMMA is 165℃-200℃. When the transparent particles are injected through the injection molding machine, the injection pressure and injection speed of the injection molding machine are adjusted according to the structure of the first prefabricated mold and the melting characteristics of PMMA.

[0086] 1103. Cool and demould to form a lens with an accommodating cavity.

[0087] In step S1103, after the molten transparent particles are completely solidified, the first prefabricated mold is cooled to room temperature and demolded to obtain a lens with a receiving cavity. By using a reasonable cooling time and demolding method, deformation or damage of the lens during the demolding process can be avoided.

[0088] 1104. Fill the accommodating cavity with colloidal first fluorescent particles through the opening end to form a first fluorescent layer.

[0089] In step S1104, the pre-prepared colloidal first fluorescent particles (KSF fluorescent powder and organic silica gel are stirred and mixed) are injected into the receiving cavity of the lens through the open end. These fluorescent particles will be evenly distributed in the receiving cavity to form a first fluorescent layer. When injecting the first fluorescent particles, the injection speed and pressure are controlled to ensure that the first fluorescent particles can evenly and fully fill the receiving cavity. The injection amount of the first fluorescent particles is adjusted according to the desired optical effect and the size of the product.

[0090] The first fluorescent particles have excellent luminous performance and stability, and can significantly improve the luminous efficiency and color accuracy of the optical element. The optical performance of the optical element can be further optimized by precisely controlling the filling amount and distribution of the fluorescent particles.

[0091] 1105. Perform sealing treatment on the open end to obtain an optical element.

[0092] In step S1105, the open end of the lens is sealed, for example, by applying sealant, heat sealing, ultrasonic sealing, mechanical pressing or other appropriate sealing methods. The sealing process should ensure that the fluorescent particles in the accommodating cavity will not leak out and maintain the integrity and stability of the lens.

[0093] Sealing is an important step to protect the internal structure and performance of optical components. Reasonable sealing methods and process parameters can ensure that optical components have good reliability and durability during long-term use.

[0094] The manufacturing method of the optical element provided in this example realizes efficient, stable and color-accurate optical element manufacturing through steps such as precise mold design, optimized injection molding process, precise filling of fluorescent particles and sealing treatment. This optical element not only has excellent optical performance, but also has good reliability and durability, providing high-quality lighting support for the backlight module. In addition, the provision of a receiving cavity for filling the first fluorescent layer simplifies the difficulty of the preparation process and improves production efficiency.

[0095] Second example

[0096] The optical element in the second example of the present application is similar to the optical element provided in the first example, except that Figure 5 As shown, in step S110, "injection molding an optical element on the light-emitting side" further includes the following steps:

[0097] 1106. Mix the colloidal first fluorescent particles and the transparent particles, and heat them to a molten state.

[0098] In step S1106, colloidal first fluorescent particles (first fluorescent powder and organic silica gel are stirred and mixed) are prepared. These particles are selected for their excellent red fluorescent emission performance. Subsequently, these first fluorescent particles are evenly mixed with an appropriate amount of transparent particles (such as transparent resin or glass microspheres). The purpose of mixing is to create a uniform luminescent medium that can maintain light transmittance and achieve efficient fluorescence conversion. Among them, the first fluorescent powder is, for example, KSF fluorescent powder, nitride red powder, etc., and the mixing ratio of the first fluorescent particles and PMMA transparent particles is adjusted according to the optical properties and physical properties of the required product.

[0099] After mixing, the entire mixture is placed in an injection molding machine and heated to a molten state to form a tighter bond between the fluorescent particles and the transparent particles, while ensuring that the mixture has good fluidity for subsequent injection molding operations. The heating temperature must be controlled within a range that allows the mixture to completely melt without destroying the luminescent properties of the fluorescent particles.

[0100] 1107. Inject the molten mixture into the second prefabricated mold.

[0101] In step S1107, the molten mixture is rapidly injected into a second prefabricated mold prepared in advance. The mold is customized according to the design requirements of the final optical element and has precise size and shape. During the injection molding process, it is necessary to ensure that the mixture evenly fills every corner of the mold to avoid the formation of bubbles or defects that affect the performance of the optical element.

[0102] 1108. Cool and demould to obtain the optical element.

[0103] In step S1108, the second preformed mold containing the molten mixture is placed in a cooling device and cooled to room temperature at a certain rate. The cooling process needs to be properly controlled to prevent internal stress or deformation caused by too fast or too slow cooling. After cooling is completed, the second preformed mold is opened, and the molded optical element is taken out from the second preformed mold to complete the demolding operation.

[0104] The optical element obtained at this time, because the first fluorescent particles are evenly distributed inside, can emit efficient red fluorescence when excited by an external light source and maintain good light transmittance. This characteristic makes the optical element particularly suitable for application scenarios that require efficient fluorescence conversion, such as LED lighting, display technology, etc.

[0105] In the manufacturing method of the optical element in this example, the first fluorescent particles are mixed with the lens and doped together, so that the filling of the first fluorescent particles is more uniform, thereby improving the conversion of optical performance.

[0106] In this embodiment, if Figure 1 As shown, when the lens 12 is injected, a support column 23 can also be simultaneously injected on the side of the lens 12 close to the backlight source 1 to support the lens 21. This not only enhances the structural stability of the lens 21 and ensures that the lens 21 can be firmly set on the substrate, but also further ensures the relative position accuracy between the optical element 2 and the backlight source 1, reduces the risk of misalignment caused by vibration or external force, and thus improves the assembly stability and overall performance of the backlight module. Among them, the support column 23 can be one or more, and the multiple support columns 23 are arranged around the lens 21 to improve balance and stability.

[0107] The backlight module provided by the present application has a first fluorescent layer far away from the light-emitting chip, which realizes the peeling of the backlight source from the first fluorescent layer. The first fluorescent layer will not be affected by the temperature rise of the light-emitting chip, and the working temperature of the first fluorescent layer is greatly reduced, and the reliability and service life are significantly improved. In addition, the first fluorescent layer is combined with the lens and is enclosed in a very closed space, which successfully blocks the first fluorescent layer from combining with water and oxygen in the air. It is not limited by the driving current and can make up for the energy loss caused by the decrease of the driving current in the related technology. Compared with the backlight module in the related technology, the backlight module in the present application can reduce the cost by at least 25%, realizing a high color gamut and low-cost backlight solution, and improving the market competitiveness of the product.

[0108] Third embodiment

[0109] like Figure 6 As shown, the present application provides a display device, including a liquid crystal panel 100 and a backlight module 200 as in the first embodiment, to enhance the visual experience of the user.

[0110] The LCD panel is responsible for displaying and controlling images, while the backlight module provides the LCD panel with a uniform light source with adjustable brightness. The two work together to achieve high-quality image output.

[0111] The liquid crystal panel is the front-end display unit of the display device. It uses the arrangement changes of liquid crystal molecules to control the transmission and blocking of light, thereby presenting different images. The liquid crystal panel used in this embodiment has the characteristics of high resolution, fast response time and wide viewing angle, which can ensure delicate images, rich colors and smooth dynamic images.

[0112] The backlight module is a key component of the display device, and its performance directly affects the quality of the display effect. This application adopts the backlight module in the first embodiment to achieve efficient optical conversion and stable high color gamut white light output, ensuring that light can be evenly irradiated on the liquid crystal panel to avoid uneven brightness or dark corners.

[0113] The display device of this embodiment performs well in terms of image quality, brightness uniformity, energy consumption control, and service life, etc. Users can enjoy a clearer, more delicate, and more comfortable visual experience whether they are watching high-definition videos, performing image processing, or doing daily office work and entertainment.

[0114] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0115] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0116] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A backlight module, characterized in that: include: A backlight source having a light emitting side; as well as An optical element, located at the light-emitting side, and used to receive the light emitted by the backlight source; wherein the optical element comprises a lens and a first fluorescent layer, and the first fluorescent layer is arranged in the lens; The lens is configured to change the propagation path of light, and the first fluorescent layer is configured to absorb part of the light, so that the light passing through the optical element appears white.

2. The backlight module according to claim 1, characterized in that: The lens is provided with a containing cavity, and the first fluorescent layer is provided in the containing cavity.

3. The backlight module according to claim 1, characterized in that: The first fluorescent layer is doped in the lens.

4. The backlight module according to claim 1, characterized in that: The optical element comprises at least one supporting column, and the supporting column is arranged on a side of the lens close to the backlight source.

5. The backlight module according to claim 1, characterized in that: The backlight source comprises a light emitting chip, a second fluorescent layer and a lamp housing, wherein the light emitting chip is installed in the lamp housing, and the second fluorescent layer is arranged in the lamp housing and covers the light emitting chip. 6 . The backlight module according to claim 5 , wherein the first fluorescent layer comprises KSF fluorescent powder, and the second fluorescent layer comprises β-Sialon fluorescent powder.

7. A method for preparing a backlight module, characterized in that: For preparing the backlight module according to claim 1, the method comprises: Providing a backlight source, the backlight source having a light emitting side; An optical element is injection molded on the light-emitting side, and the optical element is used to receive the light emitted by the backlight source; wherein the optical element includes a lens and a first fluorescent layer, and the first fluorescent layer is arranged in the lens; The lens is configured to change the propagation path of light, and the first fluorescent layer is configured to absorb part of the light, so that the light passing through the optical element appears white.

8. The method for preparing a backlight module according to claim 7, characterized in that: The optical element is injection molded on the light-emitting side, comprising: Providing a first prefabricated mold, wherein the first prefabricated mold reserves a position for a receiving cavity; wherein the receiving cavity has an open end; Injecting molten transparent particles into the first prefabricated mold to fill the area outside the accommodating cavity reserved by the prefabricated mold; Cooling and demoulding to form a lens having the accommodating cavity; Filling the accommodating cavity with colloidal first fluorescent particles through the opening end to form a first fluorescent layer; The open end is sealed to obtain the optical element.

9. The method for preparing a backlight module according to claim 7, characterized in that: The optical element is injection molded on the light-emitting side, comprising: Mixing the first fluorescent particles with the transparent particles and heating them to a molten state; injecting the molten mixture into a second prefabricated mold; The mold is then cooled and demolded to obtain the optical element.

10. A display device comprising a liquid crystal panel and the backlight module according to any one of claims 1 to 6.

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