LED light source and preparation method thereof, backlight module

Abstract

The present invention relates to an LED light source and a preparation method thereof, and a backlight module, belonging to the field of display technology. The LED light source comprises a light source substrate, a green light chip, a blue light chip and a packaging glue, wherein the green light chip and the blue light chip are fixedly placed at the upper end of the light source substrate, the green light chip and the blue light chip are both electrically connected to the light source substrate, the packaging glue is fixedly placed at the upper end of the light source substrate, the green light chip and the blue light chip are packaged in the packaging glue, and the packaging glue is mixed with diffusion powder, and the diffusion powder can perform initial scattering of the light emitted by the green light chip and the blue light chip. Compared with the prior art, the present invention can increase the light emitting angle of the LED light source, reduce costs, and extend the service life of the backlight module.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an LED light source and a preparation method thereof, and a backlight module. Background Art

[0002] As customers and the market pursue the ultimate in TV display effects, the display effects of conventional LCD TVs can no longer meet user needs. Therefore, TV displays are gradually transitioning from direct-backlit LCD displays to Mini LED quantum dot displays with higher color purity, higher color gamut coverage, higher brightness and regional dimming functions.

[0003] Among the three quantum dot materials, red quantum dots have the highest luminous efficiency and stability, followed by green and blue. Based on this, electroluminescent display solutions, that is, display solutions that use red, green and blue quantum dot materials to emit light under electric field drive at the same time, cannot be realized at this stage.

[0004] The backlight modules of quantum dot TVs currently on the market all use a transition solution of blue light Mini LED light source array + red quantum film + green quantum film. In actual applications, the instability of the green quantum film has gradually become prominent in this transition solution.

[0005] like Figure 1 and Figure 2 As shown, the Mini LED light source in the backlight module of the existing quantum dot display screen is mainly composed of a light source substrate, a blue light chip and transparent silicone. This solution has the following problems: the light is mainly emitted from the top of the light source, showing a phenomenon of bright in the middle and dark around, that is, the light-emitting angle of the light source is small; among them, the brightness of the middle part accounts for about 80% of the total brightness of the light source, and the brightness of the surroundings accounts for about 20% of the total brightness of the light source. The light-emitting angle of the light source is about 140°, which leads to uneven brightness of the quantum dot display screen. In order to obtain a uniform surface light source, not only the light source spacing needs to be small enough (the light source spacing in the prior art solution is usually 3mm to 5mm), the number of light sources in the LED light source array is sufficient, and the larger the size of the quantum dot TV, the more light sources are required, and a thicker diffuser is used (the thickness of the diffuser in the prior art solution is usually 2.5mm, 2mm, etc.), which leads to a high cost of the Mini LED display screen.

[0006] like Figure 3 As shown, the backlight module of the Mini LED quantum dot display screen in the prior art is mainly composed of a light source substrate carrying a MiniLED light source array + an LED light source + a diffuser + a red quantum film + a green quantum film. The green quantum film has insufficient stability and serious light decay during use, resulting in a short life of the entire device. Summary of the invention

[0007] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, one object of the present invention is to provide an LED light source and a preparation method thereof, and a backlight module that increase the light emitting angle of the LED light source, reduce the manufacturing cost, and extend the service life.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: an LED light source, comprising a light source substrate, a green light chip, a blue light chip and a packaging glue, wherein the green light chip and the blue light chip are fixedly placed on the upper end of the light source substrate, and the green light chip and the blue light chip are electrically connected to the light source substrate, and the packaging glue is fixedly placed on the upper end of the light source substrate, and the green light chip and the blue light chip are encapsulated in the packaging glue, and the packaging glue is mixed with diffusion powder, and the diffusion powder can perform initial scattering of the light emitted by the green light chip and the blue light chip.

[0009] The beneficial effects of the present invention are: the green light chip and the blue light chip in the Mini LED quantum dot backlight module are integrated into the LED light source, solving the problem of short life of the whole machine caused by the low stability of green quantum dots; and the light is scattered by diffusion powder so that the light can complete the initial scattering in the LED light source, so that the Mini LED quantum dot backlight module obtains a uniform surface light source.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, a nanometer light filtering reflective coating is fixedly disposed on the upper end of the packaging glue, and the nanometer light filtering reflective coating can transmit and reflect the light initially scattered by the diffusion powder.

[0012] The beneficial effect of adopting the above further scheme is that the nano-filter reflective coating can scatter the light and make the reflected light fill the gaps between adjacent LED light sources, so that a uniform surface light source can be formed on the Mini LED quantum dot backlight module.

[0013] Furthermore, the nano-filter reflective coating comprises light-transmitting areas and reflective areas coated with nano-reflective materials that are alternately arranged.

[0014] The beneficial effect of adopting the above further solution is that the light transmission area and the reflection area on the nano-filter reflective coating can be arranged reasonably, so that the light after the initial scattering is reflected evenly.

[0015] Furthermore, the area ratio of the light-transmitting area to the reflective area on the nano-filter reflective coating is 3:2 to 9:5.

[0016] The beneficial effect of adopting the above further solution is that the light transmission area and the reflection area on the nano-filter reflective coating are arranged evenly, so that the light after the initial scattering is reflected evenly.

[0017] Furthermore, the nano-filter reflective coating comprises a plurality of coating strips, the plurality of coating strips are arranged in an array, and each of the coating strips is provided with the light-transmitting areas and reflective areas arranged alternately.

[0018] The beneficial effect of adopting the above further scheme is: the area ratio of the light-transmitting area and the reflective area controls 30% of the light to be reflected back to the module substrate of the Mini LED quantum dot backlight module, so that the Mini LED quantum dot backlight module obtains a uniform surface light source.

[0019] Furthermore, the light-transmitting areas and the reflective areas on two adjacent coating strips are arranged in a staggered manner.

[0020] The beneficial effect of adopting the above further solution is that the light transmission area and the reflection area on the nano-filter reflective coating can be arranged reasonably, so that the light after the initial scattering is reflected evenly.

[0021] Furthermore, the light-transmitting areas and the reflective areas are configured as alternatingly arranged concentric rings.

[0022] The beneficial effect of adopting the above further solution is that the light transmission area and the reflection area on the nano-filter reflective coating can be arranged reasonably, so that the light after the initial scattering is reflected evenly.

[0023] Furthermore, a scattering layer is fixedly disposed on the upper end of the nano-filter reflective coating, and the scattering layer can perform secondary scattering on the light transmitted through the nano-filter reflective coating.

[0024] The beneficial effect of adopting the above further solution is that most of the light that is initially scattered is secondarily scattered in the scattering layer, so that the light emitted from the LED light source is more uniform.

[0025] Another technical solution of the present invention to solve the above technical problem is as follows: A method for preparing an LED light source comprises the following steps:

[0026] Bonding the blue light chip and the green light chip onto the light source substrate;

[0027] The packaging glue mixed with diffusion powder is molded on the light source substrate to encapsulate the blue light chip and the green light chip in the packaging glue. The diffusion powder can perform primary scattering on the light emitted by the blue light chip and the green light chip.

[0028] Based on the above technical solution, the present invention can also be improved as follows.

[0029] Furthermore, the invention also includes the following steps: using a nano-coating process to coat a nano-filter reflective coating on the top of the packaging glue, wherein the nano-filter reflective coating can transmit and reflect the light initially scattered by the diffusion powder, and the nano-filter reflective coating includes light-transmitting areas and reflective areas coated with nano-reflective materials that are alternately arranged, and the area ratio of the light-transmitting areas to the reflective areas on the nano-filter reflective coating is 3:2 to 9:5.

[0030] Furthermore, the method further comprises the following steps: a scattering layer is molded on the nanometer light filtering reflective coating, and the scattering layer can perform secondary scattering on the light transmitted through the nanometer light filtering reflective coating.

[0031] The beneficial effect of the present invention is that by utilizing silica gel mixed with diffusion powder, nano-filter reflective coating and scattering layer, the light-emitting angle of the LED light source can be increased from 140° to 170°, so that the Mini LED quantum dot backlight module can obtain a more uniform surface light source.

[0032] Another technical solution of the present invention to solve the above technical problems is as follows: a backlight module, comprising multiple LED light sources, a module substrate, a diffuser, a red quantum film and an optical film, wherein the multiple LED light sources are arrayed on the module substrate, the diffuser is fixedly placed above the multiple LED light sources, the red quantum film is fixedly placed above the diffuser, and the optical film is fixedly placed at the upper end of the red quantum film.

[0033] The beneficial effect of the present invention is that by increasing the light-emitting angle of the LED light source, the light-emitting angle of the LED light source is increased from 140° to 170°, so that the spacing between the LED light sources can be increased, the number of light sources in the LED light source array can be reduced, and the cost of the backlight module can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a conventional LED light source;

[0035] Figure 2 It is a schematic diagram of the lighting effect of the LED light source in the prior art;

[0036] Figure 3 It is a structural schematic diagram of a backlight module in the prior art;

[0037] Figure 4 This is a schematic structural diagram of a first embodiment of an LED light source of the present invention;

[0038] Figure 5 This is a schematic diagram of light scattering of the first embodiment of the LED light source of the present invention;

[0039] Figure 6This is a schematic diagram of light reflection of the first embodiment of the LED light source of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the nanometer light filter reflective coating in the first embodiment of the LED light source of the present invention;

[0041] Figure 8 Another schematic diagram of the structure of the nanometer filter reflective coating in the first embodiment of the LED light source of the present invention;

[0042] Fig. 9 This is a schematic structural diagram of a second embodiment of an LED light source of the present invention;

[0043] Fig.10 Schematic diagram of the light emitting angle of the LED light source of the present invention;

[0044] Fig.11 Schematic diagram of brightness distribution of LED light source of the present invention;

[0045] Fig.12 It is a schematic diagram of the lighting effect of the LED light source of the present invention;

[0046] Fig.13 This is a flow chart of the preparation of the LED light source of the present invention;

[0047] Fig.14 It is a structural schematic diagram of the backlight module of the present invention;

[0048] Fig.15 It is a schematic diagram of light reflection of the backlight module of the present invention.

[0049] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0050] 1. LED light source, 1.1. light source substrate, 1.2. blue light chip, 1.3. silica gel, 1.4. green light chip, 1.5. nano filter reflective coating, 1.6. scattering layer;

[0051] 1.5.1, light-transmitting area, 1.5.2, reflective area;

[0052] 2. Module substrate;

[0053] 3. Diffuser;

[0054] 4. Red quantum film;

[0055] 5. Optical film;

[0056] 6. Green quantum film. DETAILED DESCRIPTION

[0057] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0058] Embodiment 1:

[0059] like Figures 4 to 7 The figure is a schematic diagram of the structure of the first embodiment of the LED light source of the present invention. An LED light source in the present invention not only includes a light source substrate 1.1, a blue light chip 1.2 and a silica gel 1.3, but also includes a green light chip 1.4, the green light chip 1.4 and the blue light chip 1.2 are both fixedly placed on the upper end of the light source substrate 1.1, and the green light chip 1.4 and the blue light chip 1.2 are both electrically connected to the light source substrate 1.1, the silica gel 1.3 is fixedly placed on the upper end of the light source substrate 1.1 by molding, the green light chip 1.4 and the blue light chip 1.2 are encapsulated in the silica gel 1.3, and the silica gel 1.3 protects the green light chip 1.4 and the blue light chip 1.2 and the parts of the green light chip 1.4 and the blue light chip 1.2 that are electrically connected to the light source substrate 1.1. In the above-mentioned method, the blue light chip 1.2 and the green light chip 1.4 are simultaneously packaged on the light source substrate 1.1, and the LED light source 1 utilizes the blue light chip 1.2 and the green light chip 1.4 to emit blue light and green light respectively; the LED light source 1 is assembled in the Mini LED quantum dot backlight module, so that the green light part in the Mini LED quantum dot backlight module is integrated into the LED light source 1, thereby solving the problem of short life of the whole machine caused by the low stability of the green quantum dot film.

[0060] In the above embodiment, if Figure 4 and Figure 5 As shown, the silica gel 1.3 is mixed with diffusion powder.

[0061] Diffusion powder is mixed into the silica gel 1.3 and is irregularly dispersed in the silica gel 1.3. When the light emitted by the blue light chip 1.2 and the green light chip 1.4 on the light source substrate 1.1 is emitted into the silica gel 1.3, the light encounters the diffusion powder particles and is scattered, so that the light can complete the initial scattering in the LED light source, thereby enabling the Mini LED quantum dot backlight module to obtain a uniform surface light source.

[0062] In the above embodiment, a nano-filter reflective coating 1.5 is fixedly disposed on the upper end of the silica gel 1.3, and the nano-filter reflective coating 1.5 can transmit and reflect the light initially scattered by the diffusion powder.

[0063] The light emitted by the above-mentioned blue light chip 1.2 and green light chip 1.4 will enter the nano-filter reflective coating 1.5 after being initially scattered by the silica gel 1.3 mixed with diffusion powder. The nano-filter reflective coating 1.5 can make about 50% of the initially scattered light pass through the diffuser 3 of the Mini LED quantum dot backlight module, and the remaining about 30% of the light will be reflected back to the module substrate 2 of the Mini LED quantum dot backlight module and then reflected from the module substrate 2 to the diffuser 3. Figure 6 , Fig.14 and Fig.15 In short, the LED light source in this embodiment can scatter light and make the reflected light fill the gaps between adjacent LED light sources, so that a uniform surface light source can be formed on the Mini LED quantum dot backlight module.

[0064] In the above embodiment, the nano-filter reflective coating 1.5 includes a plurality of coating strips, and the plurality of coating strips are arranged in an array; each of the coating strips is provided with a light-transmitting area 1.5.1 and a reflective area 1.5.2 coated with a nano-reflective material, the light-transmitting areas 1.5.1 and the reflective areas 1.5.2 are arranged alternately, and the light-transmitting areas 1.5.1 and the reflective areas 1.5.2 on adjacent coating strips are arranged in a staggered manner, as shown in FIG. Figure 7 shown.

[0065] Furthermore, the light-transmitting area 1.5.1 is not coated with nano-reflective material, and the reflective area 1.5.2 is coated with nano-reflective material, so that the light after the initial scattering can be transmitted through the nano-filter reflective coating 1.5 by the light-transmitting area 1.5.1, and the light after the initial scattering can be reflected by the reflective area 1.5.2. At the same time, the light-transmitting area 1.5.1 and the reflective area 1.5.2 on each coating belt are arranged alternately, and the light-transmitting area 1.5.1 and the reflective area 1.5.2 on two adjacent coating belts are arranged in a staggered manner, so that the light-transmitting area 1.5.1 and the reflective area 1.5.2 on the nano-filter reflective coating 1.5 can be arranged reasonably, so that the light after the initial scattering is reflected evenly, so that the Mini LED quantum dot backlight module obtains a uniform surface light source.

[0066] In other embodiments, the light-transmitting area 1.5.1 and the reflective area 1.5.2 are configured as alternating concentric rings, so that the light-transmitting area 1.5.1 and the reflective area 1.5.2 on the nano-filter reflective coating 1.5 can be reasonably arranged, so that the light after the initial scattering is evenly reflected, so that the Mini LED quantum dot backlight module obtains a uniform surface light source, specifically as Figure 8 shown.

[0067] In the above embodiment, the area ratio of the light-transmitting area 1.5.1 to the reflective area 1.5.2 on the nano-filter reflective coating 1.5 is 3:2 to 9:5.

[0068] More preferably, when the sum of the areas of the light-transmitting area 1.5.1 and the reflective area 1.5.2 on the nano-filter reflective coating 1.5 is 1, the area of ​​the light-transmitting area 1.5.1 accounts for 62.5%, and the area of ​​the reflective area 1.5.2 accounts for 37.5%. Figure 7 and Figure 8 shown.

[0069] The area ratio of the above-mentioned light-transmitting area 1.5.1 and the reflective area 1.5.2 is such that about 50% of the initially scattered light can pass through the nano-filter reflective coating 1.5, and the remaining about 30% of the light can be reflected back onto the module substrate 2 of the Mini LED quantum dot backlight module, ultimately enabling the Mini LED quantum dot backlight module to obtain a uniform surface light source.

[0070] Embodiment 2:

[0071] like Fig. 9 FIG. 1 is a schematic diagram of the structure of the second embodiment of the LED light source of the present invention. In the LED light source of the present invention, based on the first embodiment, a scattering layer 1.6 is fixedly arranged on the upper end of the nano-filter reflective coating 1.5. The scattering layer 1.6 is made of silica gel mixed with diffusion powder, wherein the diffusion powder and silica gel are physically mixed and no chemical reaction occurs.

[0072] Most of the light initially scattered by the silica gel 1.3 will pass through the nano-filter reflective coating 1.5 and enter the scattering layer 1.6, and will be secondary scattered in the scattering layer 1.6, so that the light emitted from the LED light source 1 is more uniform; at the same time, the light reflected by the nano-filter reflective coating 1.5 and the module substrate 2 will fill the gaps between adjacent LED light sources 1. Therefore, by using the silica gel 1.3 mixed with diffusion powder, the nano-filter reflective coating 1.5 and the scattering layer 1.6, the light emitting angle of the LED light source 1 can be increased from 140° to 170°. Fig. 9 At the same time, compared with the prior art, this embodiment can enable the MiniLED quantum dot backlight module to obtain a more uniform surface light source, as shown in Fig.10 and Fig.11 shown.

[0073] Embodiment 3:

[0074] like Fig.12 As shown, the present invention also provides a method for preparing an LED light source, which specifically comprises the following steps:

[0075] S1. Apply solder paste: Print solder paste on the whole substrate so that the solder paste adheres to the pads on the whole substrate where the die is to be bonded. The whole substrate can be cut into light source substrates 1.1 with a size of 1.0 mm*1.0 mm, and the light source substrates 1.1 are arranged in an array.

[0076] S2, die bonding: flip-chip multiple groups of blue light chips 1.2 and green light chips 1.4 at the corresponding die bonding positions on the whole substrate, and solder the blue light chips 1.2 and green light chips 1.4 to the corresponding pads on the whole substrate through solder paste after reflow soldering, so as to achieve electrical connection between the blue light chips 1.2 and green light chips 1.4 and the pads of the whole substrate. The number of groups of blue light chips 1.2 and green light chips 1.4 is consistent with the number of light source substrates 1.1 on the whole substrate, that is, one group of blue light chips 1.2 and green light chips 1.4 is soldered on one light source substrate 1.1 through solder paste.

[0077] S3, first molding: The silica gel 1.3 mixed with diffusion powder is pressed onto the entire substrate by molding, so that the silica gel 1.3 mixed with diffusion powder encapsulates the blue light chip 1.2 and the green light chip 1.4. The thickness of the silica gel 1.3 is about 270um, and the thickness of the silica gel 1.3 is slightly greater than the thickness of the blue light chip 1.2 and the green light chip 1.4.

[0078] S4. Coating a nano-filter reflective coating 1.5 on the top of the silica gel 1.3 using a nano-coating process.

[0079] In this embodiment, a nano-filter reflective coating 1.5 is coated on the top of the silica gel 1.3, so that the light emitted by the blue chip 1.2 and the green chip 1.4 can enter the nano-filter reflective coating 1.5 after the initial scattering through the silica gel 1.3 mixed with diffusion powder. The nano-filter reflective coating 1.5 can make about 50% of the light scattered initially pass through, and the remaining about 30% of the light will be reflected back to the module substrate 2 of the Mini LED quantum dot backlight module, and then reflected from the module substrate 2 to the diffuser 3 of the Mini LED quantum dot backlight module. The light reflected by the nano-filter reflective coating 1.5 can fill the gaps between adjacent LED light sources 1, forming a uniform surface light source on the Mini LED quantum dot backlight module.

[0080] In this embodiment, the specific steps of coating the nano-filter reflective coating 1.5 on the top of the silica gel 1.3 using the nano-coating process are as follows: use a sprayer to coat the nano-reflective material on the top of the silica gel 1.3, and form a staggered arrangement of a light-transmitting area 1.5.1 not coated with the nano-reflective material and a reflective area 1.5.2 coated with the nano-reflective material on the top of the silica gel 1.3, and then bake and cure the reflective area 1.5.2 to obtain the nano-filter reflective coating 1.5. Among them, the area of ​​the light-transmitting area 1.5.1 accounts for 62.5%, and the area of ​​the reflective area accounts for 37.5%, so that about 50% of the light in the initial scattering is transmitted, and the remaining about 30% of the light is reflected back to the module substrate 2 of the Mini LED quantum dot backlight module.

[0081] S5, second molding: a scattering layer 1.6 is laminated on the nano-filter reflective coating 1.5 by molding, and the thickness of the scattering layer 1.6 is about 100 um.

[0082] Most of the light rays that are initially scattered by the silica gel 1.3 can pass through the nano-filter reflective coating 1.5 and enter the scattering layer 1.6, and undergo secondary scattering in the scattering layer 1.6, so that the light rays emitted from the LED light source 1 can be more uniform.

[0083] In summary, this embodiment uses silica gel 1.3 mixed with diffusion powder, nano-filter reflective coating 1.5 and scattering layer 1.6 to increase the light-emitting angle of the LED light source 1 from 140° to 170°, so that the Mini LED quantum dot backlight module obtains a more uniform surface light source.

[0084] S6, cutting, light splitting, and taping: After the second molding, the entire substrate is cut into single LED light sources with a size of 1.0 mm*1.0 mm, and then light splitting and taping are performed.

[0085] Embodiment 4:

[0086] like Fig.13 and Fig.14 , which is a schematic diagram of the structure of a backlight module of the present invention. The backlight module in the present invention comprises an LED light source 1, a module substrate 2, a diffuser 3, a red quantum film 4 and an optical film 5. Among them, a plurality of the LED light sources 1 are arranged in an array on the module substrate 2, the diffuser 3 is fixed above the plurality of the LED light sources 1, the red quantum film 4 is fixed above the diffuser 3, and the optical film 5 is fixed at the upper end of the red quantum film 4.

[0087] Further, if Fig.15As shown, a plurality of LED light sources 1 are arranged in an array on the module substrate 2, and the LED light source 1 can increase the light-emitting angle of the LED light source 1 from 140° to 170° by using silica gel 1.3 mixed with diffusion powder, nano-filter reflective coating 1.5 and scattering layer 1.6, so that the distance between the LED light sources 1 can be increased by increasing the light-emitting angle of the LED light source 1. In this embodiment, the distance between two adjacent LED light sources 1 is 10 mm. Compared with the prior art, the distance between the light sources is greatly increased, so that the amount of LED light sources in the Mini LED quantum dot backlight module can be reduced, thereby reducing the overall cost of the Mini LED display.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED light source, comprising a light source substrate, a green light chip, a blue light chip and a packaging glue, wherein the green light chip and the blue light chip are fixedly placed on the upper end of the light source substrate, the green light chip and the blue light chip are both electrically connected to the light source substrate, and the packaging glue is fixedly placed on the upper end of the light source substrate, characterized in that: The green light chip and the blue light chip are encapsulated in the encapsulation glue, and the encapsulation glue is mixed with diffusion powder, and the diffusion powder can perform primary scattering on the light emitted by the green light chip and the blue light chip; A nanometer light filtering reflective coating is fixedly disposed on the upper end of the packaging glue, and the nanometer light filtering reflective coating can transmit and reflect the light initially scattered by the diffusion powder; The nanometer light filtering reflective coating comprises light-transmitting areas and reflective areas coated with nanometer light-reflecting materials which are arranged alternately.

2. The LED light source according to claim 1, characterized in that: The area ratio of the light-transmitting area to the reflective area on the nano-filter reflective coating is 3:2 to 9:

5.

3. The LED light source according to claim 2, characterized in that: The nano-filter reflective coating comprises a plurality of coating strips, the plurality of coating strips are arranged in an array, and each of the coating strips is provided with the light-transmitting areas and reflective areas arranged alternately.

4. The LED light source according to claim 3, characterized in that: The light-transmitting areas and the reflective areas on two adjacent coating strips are arranged in a staggered manner.

5. The LED light source according to claim 2, characterized in that: The light-transmitting areas and the reflective areas are configured as alternatingly arranged concentric rings.

6. The LED light source according to claim 1, characterized in that: A scattering layer is fixedly arranged on the upper end of the nanometer light filtering reflective coating, and the scattering layer can perform secondary scattering on the light transmitted through the nanometer light filtering reflective coating.

7. A method for preparing an LED light source according to any one of claims 1 to 6, characterized in that: The following steps are involved: Bonding the blue light chip and the green light chip onto the light source substrate; The packaging glue mixed with diffusion powder is molded on the light source substrate to encapsulate the blue light chip and the green light chip in the packaging glue. The diffusion powder can perform primary scattering on the light emitted by the blue light chip and the green light chip.

8. The method for preparing an LED light source according to claim 7, characterized in that: The following steps are also included: A nano-filter reflective coating is coated on the top of the packaging glue by a nano-coating process. The nano-filter reflective coating can transmit and reflect the light initially scattered by the diffusion powder. The nano-filter reflective coating includes light-transmitting areas and reflective areas coated with nano-reflective materials that are alternately arranged. The area ratio of the light-transmitting area to the reflective area on the nano-filter reflective coating is 3:2 to 9:

5.

9. The method for preparing an LED light source according to claim 8, characterized in that: The following steps are also included: A scattering layer is molded on the nanometer light filtering reflective coating, and the scattering layer can perform secondary scattering on the light transmitted through the nanometer light filtering reflective coating.

10. A backlight module, characterized in that: It comprises a plurality of LED light sources, a module substrate, a diffuser, a red quantum film and an optical film as described in any one of claims 1 to 6, wherein the plurality of LED light sources are arrayed on the module substrate, the diffuser is fixedly placed above the plurality of LED light sources, the red quantum film is fixedly placed above the diffuser, and the optical film is fixedly placed at the upper end of the red quantum film.

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