Backlight module and display device

Abstract

The application discloses a backlight module and a display device, and belongs to the technical field of display. The backlight module comprises a substrate of a backlight main body, a light source layer comprising a plurality of light sources (used for emitting first light which is monochromatic light) and a plurality of packaging parts, the light sources are packaged in the corresponding packaging parts, a first light source auxiliary part in a first light source auxiliary layer is located above the corresponding light source and is fixedly arranged with the corresponding packaging part, so as to convert the received first light into second light, a color conversion layer is located on the side, away from the substrate, of the first light source auxiliary layer, so as to convert the received first light emitted by the plurality of light sources into third light, and the second light and the third light are mixed color light with the same color, so that the consistency of light intensity at each position of the backlight module is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a backlight module and display device. Background Technology

[0002] Mini LED (Mini Light Emitting Diode) has gained favor from consumers and the market as a backlighting solution for high-performance display modules.

[0003] When Mini LEDs are used to implement direct-lit backlight designs, the area directly facing the Mini LED is brighter, while the area between two Mini LEDs is less bright. When the distance between the Mini LED and the optical film is small, resulting in a small light mixing distance, the above brightness difference becomes more obvious, and the display panel exhibits a noticeable shadow phenomenon. Utility Model Content

[0004] This application provides a backlight module and a corresponding display device, which reduces the brightness difference between different areas above a Mini LED when used as a direct-lit backlight, thereby at least partially solving the aforementioned technical problem. To achieve the above objective, according to a first aspect of this application, a backlight module is provided, including a backlight body, the backlight body comprising: substrate; A light source layer, located on the substrate, includes multiple light sources and multiple encapsulation portions. The light sources are used to emit first light, and the light sources are encapsulated within the corresponding encapsulation portions. The first light source auxiliary layer includes a plurality of first light source auxiliary parts, wherein the first light source auxiliary parts are located above the corresponding light source and are fixedly disposed with the corresponding encapsulation part, and are used to convert the received first light into second light; A color conversion layer, located on the side of the first light source auxiliary layer away from the substrate, is used to convert the first light received from the plurality of light sources into a third light; The first light is monochromatic light, while the second and third lights are mixed-color lights of the same color.

[0005] Optionally, the first light source auxiliary part covers at least directly above the corresponding light source, and the distance between the boundary of the orthographic projection of the first light source auxiliary part on the substrate and the boundary of the orthographic projection of the corresponding light source on the substrate is less than or equal to 30 micrometers.

[0006] Optionally, the encapsulation portion covers the side and top of the corresponding light source, and the first light source auxiliary portion is fixed to the side of the corresponding encapsulation portion away from the corresponding light source.

[0007] Optionally, the constituent materials of the first light source auxiliary part and the constituent materials of the encapsulation part both include at least one of silicone and epoxy resin.

[0008] Optionally, the first light is blue, and the second and third lights are both white.

[0009] Optionally, the constituent materials of the first light source auxiliary part may also include phosphors or quantum dots.

[0010] Optionally, the constituent materials of the first light source auxiliary part include yellow phosphor or yellow quantum dots.

[0011] Optionally, the constituent materials of the first light source auxiliary part include yellow phosphor, red phosphor, and green phosphor; Alternatively, the constituent materials of the first light source auxiliary part may include yellow quantum dots, red quantum dots, and green quantum dots.

[0012] Optionally, the distance between two adjacent light sources is greater than or equal to 4 mm and less than or equal to 6 mm.

[0013] Optionally, the backlight body further includes: A diffusion layer, located between the first light source auxiliary layer and the color conversion layer, is used to homogenize the second light and the first light. The second light source auxiliary layer includes at least one second light source auxiliary part, each of which is located on a corresponding side of the diffusion layer and is used to convert the light scattered from the side of the diffusion layer into the second light.

[0014] Optionally, the second light source auxiliary layer includes a plurality of second light source auxiliary parts corresponding to a plurality of sides of the diffusion layer, and each second light source auxiliary part is disposed corresponding to a side of the diffusion layer.

[0015] Optionally, the backlight body further includes: A backplate for accommodating the substrate, the light source layer, the first light source auxiliary layer and the color conversion layer, comprising a backplate body located on the side of the substrate away from the light source layer, and a backplate frame connected to the edge of the backplate body and extending towards the light-emitting side of the light source layer; The second light source auxiliary part is fixed to the side of the back plate frame near the diffusion layer.

[0016] Optionally, the second light source auxiliary layer is composed of at least one of silicone and epoxy resin, the second light source auxiliary portion is strip-shaped, and the extension direction of the second light source auxiliary portion is the same as the extension direction of the corresponding side portion of the diffusion layer.

[0017] Optionally, the backlight body further includes: A reflective layer is located on the substrate and between the plurality of light sources.

[0018] According to a second aspect of this application, a display device is provided, comprising: Backlight module as described in any of the above items; The display panel is located on the light-emitting side of the backlight module.

[0019] Optionally, the backlight module further includes: The frame includes a frame body located on the periphery of multiple sides of the backlight body, and a frame border connected to the edge of the frame body and extending to the edge area covering the upper part of the backlight body. A connecting part is located between the frame and the display panel and is used to fix the two together.

[0020] In the backlight module and its corresponding display device of this application embodiment, based on a substrate, a light source layer (including multiple light sources and multiple encapsulation parts, wherein the light source is used to emit first light of monochromatic light and the light source is encapsulated within the corresponding encapsulation part) located on the side of the light source layer away from the substrate (used to convert the received first light emitted by the multiple light sources into third light), by providing a first light source auxiliary layer between the light source layer and the color conversion layer, and each of the first light source auxiliary parts in the first light source auxiliary layer is located above the corresponding light source and fixedly disposed with the corresponding encapsulation part, the received first light is converted into second light, and the second light and the third light are mixed color light of the same color, thereby reducing the energy difference of the first light incident on the color conversion layer in different areas of the light source layer, thereby improving the uniformity of light intensity at all parts of the backlight module.

[0021] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figures 1 to 4This is a schematic diagram of the backlight module and its included backlight body provided in an exemplary embodiment of this application; Figures 5 to 6 This is a schematic diagram of the structure of the display device provided in an exemplary embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0025] According to the first aspect of this application, referring to Figures 1 to 4 A backlight module 100 is provided, including a backlight body 101, the backlight body 101 including: a substrate 10; a light source layer 20, located on the substrate 10, including a plurality of light sources 201 and a plurality of encapsulation portions 202, the light sources 201 being used to emit a first light L1, the light sources 201 being encapsulated within a corresponding encapsulation portion 202; a first light source auxiliary layer 30, including a plurality of first light source auxiliary portions 301, the first light source auxiliary portions 301 being located above the corresponding light sources 201 and fixedly disposed with the corresponding encapsulation portion 202, used to convert the received first light L1 into a second light L2; a color conversion layer 40, located on the side of the first light source auxiliary layer 30 away from the substrate 10, used to convert the received first light L1 emitted by the plurality of light sources 201 into a third light L3; wherein, the first light L1 is monochromatic light, the second light L2 and the third light L3 are mixed color light of the same color.

[0026] The substrate 10 may include a PCB (Printed Circuit Board), which can be manufactured using electronic printing technology. It can realize the electrical connection between the light source layer 20 and the power supply, and generate multiple electrical signals that are transmitted to multiple light sources 201 by processing the electrical signals provided by the power supply accordingly.

[0027] The multiple light sources 201 in the light source layer 20 may include at least one of Mini LED and Micro LED (Micro Light Emitting Diode). The multiple light sources 201 can be laid flat on the substrate 10 to emit multiple first lights L1 to form a direct-lit backlight scheme.

[0028] It is important to note that, in combination Figures 1 to 4As shown, since the source of the backlight comes from the light source 201, the brightness of the area above the light source 201 is greater than that of the area above the two adjacent light sources 201. Especially when the distance between the light source layer 20 and the optical film (located on the side of the color conversion layer 40 away from the substrate 10) is small, resulting in a small light mixing distance, the brightness difference between the area corresponding to the light source 201 and the area corresponding to the two adjacent light sources 201 on the light-emitting side of the backlight body 101 in the backlight module 100 is more obvious. Therefore, when applied to a display device, the display screen in the display device has obvious lamp shadow phenomenon.

[0029] Specifically, the light source layer 20 can be fabricated using either COB (Chip on Board, where the chip is die-bonded onto the substrate) or POB (Package on Board, where surface mount devices are mounted onto the substrate) packaging method. In COB packaging, the chip of the light source 201 is die-bonded onto the PCB, and then the corresponding package 202 is covered. There is no need to package it into a separate device; the chip and the PCB are directly electrically connected, resulting in a more compact overall structure. In POB packaging, the chip of the light source 201 is packaged into an independent surface mount device, and then the surface mount device is mounted onto the PCB. Since each light source 201 has its own bracket, the heat dissipation effect is better.

[0030] Understandably, compared to the first light L1 emitted from the side of the light source 201, even though the first light L1 emitted directly above the light source 201 has the strongest energy, this embodiment provides a first light source auxiliary layer 30 between the light source layer 20 and the color conversion layer 40. Each first light source auxiliary part 301 in the first light source auxiliary layer 30 is fixedly disposed with a corresponding encapsulation part 202 to fix its position, so that most of the first light L1 emitted from above the light source 201 can be converted into second light L2 by the corresponding encapsulation part 202, thereby consuming some energy. The other first light L1 emitted by the light source 201 can be converted into third light L3 by the color conversion layer 40. Since at least some of the energy of the first light L1 emitted directly above the light source 201 is preferentially consumed by the encapsulation part 202, the difference in energy of the first light L1 emitted from different areas of the light source layer 20 toward the color conversion layer 40 is reduced, thereby improving the consistency of light intensity at various points of the backlight body 101 in the backlight module 100, and thus improving the uniformity of the display screen of the display panel to which it is applied.

[0031] Wherein, the first light L1 is monochromatic light generated by the light source 201, and the second light L2 and the third light L3 are mixed-color lights of the same color generated by the first light source auxiliary layer 30 and the color conversion layer 40 respectively processing the first light L1. In this embodiment, the specific colors of the monochromatic light and the mixed-color light are not limited.

[0032] In some embodiments, refer to Figures 1 to 4 The first light L1 is blue, while the second light L2 and the third light L3 are both white. The light source 201 can be composed of materials including, but not limited to, gallium nitride (GaN). Gallium nitride-based blue LEDs have high electroluminescence efficiency (currently exceeding 80%), low temperature sensitivity of blue light wavelengths, and good stability. Based on this, by selecting suitable materials for the first light source auxiliary layer 30 and the color conversion layer 40 to affect the first light L1, the second light L2 and the third light L3, both white, can be generated. For example, the materials of the first light source auxiliary layer 301 can include phosphors or quantum dots, and the materials of the color conversion layer 40 can also include phosphors or quantum dots.

[0033] Specifically, the constituent materials of the first light source auxiliary part 301 include yellow phosphor or yellow quantum dots.

[0034] When the constituent materials of the first light source auxiliary unit 301 include yellow phosphor (including at least one of silicate phosphor and rare earth yttrium aluminum garnet phosphor), it can be considered that after the yellow phosphor absorbs high-energy photons (i.e., the first blue light L1 here), the electron transition of the activator ions inside it releases low-energy photons, thereby exciting the generation of yellow light (the emission wavelength is determined by the chemical composition of the material), which mixes with the remaining blue light to form white light (i.e., the second light L2 mentioned above), which belongs to photoluminescence.

[0035] When the constituent material of the first light source auxiliary unit 301 includes yellow quantum dots (including at least one of cadmium-based quantum dots and cadmium-free quantum dots), it can be considered that the band gap energy of the yellow quantum dots matches the blue photon (i.e., the first blue light L1 here). After absorption, the electron jumps from the valence band to the conduction band to form an electron-hole pair. When the electron and hole recombine in the quantum dot, a yellow photon with lower energy is released (the emission wavelength is determined by the size of the quantum dot), which mixes with the remaining blue light to form white light (i.e., the second light L2 mentioned above), which belongs to photoluminescence.

[0036] Similarly, the constituent materials of the color conversion layer 40 also need to include yellow phosphor or yellow quantum dots to convert other first light L1 emitted by the light source 201 (at least including the first light L1 emitted from the side of the light source 201) into third light L3.

[0037] Understandably, in this embodiment, the blue first light L1 emitted by the light source 201 first passes through the corresponding encapsulation part 202 and is emitted upward and to the side. The first light L1 emitted from the top of the encapsulation part 202 passes through the first light source auxiliary part 301 located above it and is converted into white second light L2 by the yellow phosphor or yellow quantum dots inside it to consume some of the higher energy first light L1. The remaining small amount of first light L1 emitted from the top of the encapsulation part 202 and the first light L1 emitted from the side of the encapsulation part 202 can be converted into white third light L3 by the color conversion layer 40, which includes at least yellow phosphor or yellow quantum dots.

[0038] Furthermore, refer to Figures 1 to 4 The first light source auxiliary unit 301 is composed of yellow phosphor, red phosphor, and green phosphor; or, the first light source auxiliary unit 301 is composed of yellow quantum dots, red quantum dots, and green quantum dots. For example, in addition to yellow phosphor, the first light source auxiliary unit 301 may also include red phosphor and green phosphor; or, in addition to yellow quantum dots, the first light source auxiliary unit 301 may also include red quantum dots and green quantum dots.

[0039] When the constituent materials of the first light source auxiliary unit 301 also include red phosphor and green phosphor, it may include rare earth tri-color phosphor. The red component may include at least one of nitride and oxynitride, and the green component may include silicate or aluminate. The ratio of red to green phosphor can be adjusted according to the requirements of color temperature and color rendering index, for example, red:green is about 1:2 to 1:3. Alternatively, the green component in the constituent materials of the first light source auxiliary unit 301 may include oxynitride, and the red component may include potassium manganese fluorosilicate phosphor.

[0040] When the constituent materials of the first light source auxiliary unit 301 also include red quantum dots and green quantum dots, the red quantum dots may include cadmium-based quantum dots, cadmium-free quantum dots (the corresponding emission wavelength can be achieved by adjusting the size of the corresponding nucleus) or copper indium sulfide, and the green quantum dots may include cadmium-based quantum dots or cadmium-free quantum dots (the corresponding emission wavelength can be achieved by adjusting the size of the corresponding nucleus).

[0041] The interaction principle of red and green phosphors with blue first light L1 can be referred to the interaction principle of yellow phosphor with blue first light L1 mentioned above. Similarly, the interaction principle of red and green quantum dots with blue first light L1 can be referred to the interaction principle of yellow quantum dots with blue first light L1 mentioned above.

[0042] As discussed above, in this embodiment, by setting the constituent materials of the first light source auxiliary unit 301 to include yellow phosphor to convert the blue first light L1 generated by the light source 201 into white second light L2, since the amount of yellow phosphor is limited, there is still excess blue first light L1 emitted by the light source 201. This part can be mixed with the red light and green light generated by the red phosphor and green phosphor in the first light source auxiliary unit 301 respectively excited by the blue first light L1 to form white light (i.e., the aforementioned third light L3).

[0043] The same logic applies when the constituent materials of the first light source auxiliary unit 301 include yellow quantum dots, red quantum dots, and green quantum dots.

[0044] Understandably, by setting the aforementioned first light source auxiliary layer 30, this application can not only improve the consistency of light intensity at various locations of the backlight body 101 in the backlight module 100, but also create a standard color conversion layer 40 to form backlight bodies 101 in the backlight module 100 that emit different white light, thus adapting to display panels with different white light backlight requirements. Specifically, for display panels with different white light backlight requirements, under the premise of using the same standard color conversion layer 40, by differentiating the types or proportions of yellow phosphors or yellow quantum dots in the first light source auxiliary part 301 of the backlight body 101 in the backlight module 100, different white light can be emitted to achieve different color dot requirements. Since the same standard color conversion layer 40 is used, the manufacturing cost of the color conversion layer 40 for display panels with different white light backlight requirements can be greatly reduced.

[0045] Furthermore, by setting the constituent materials of the first light source auxiliary unit 301 to include red phosphor and green phosphor, or red quantum dots and green quantum dots, the flexibility of the first light source auxiliary unit 301 in adjusting the color points of the backlight body 101 in the backlight module 100 is further improved, and the selectivity of the color points of the backlight body 101 in the backlight module 100 using the same reference color conversion layer 40 is further increased.

[0046] In some embodiments, refer to Figures 1 to 4 The materials used to construct the first light source auxiliary part 301 and the encapsulation part 202 both include at least one of silicone and epoxy resin. Regardless of whether the light source layer 20 is manufactured using COB or POB encapsulation, the encapsulation part 202 can be made of the same material. For example, an encapsulation part 202 made of at least one of epoxy resin and silicone can have advantages such as high temperature resistance, high viscosity, and excellent flexibility.

[0047] Specifically, taking COB packaging as an example, the original substrate can be pre-treated, including but not limited to die expansion and back adhesive, to form the substrate 10. Then, the multiple light sources 201 can be fixed on the substrate 10 by methods including but not limited to die bonding and curing. Further, the multiple light sources 201 can be electrically connected to the substrate 10 by methods including but not limited to bonding, thermoforming, ultrasonic welding, and gold wire ball bonding. Finally, the multiple light sources 201 can be packaged by methods including but not limited to dispensing, covering, baking and curing.

[0048] Based on this, a fluorescent powder adhesive (or quantum dot adhesive) containing at least one of the aforementioned yellow phosphor or yellow quantum dots can be applied to the outer surface of the encapsulation part 202 in an area corresponding to the (direct) above the light source 201 using at least one dispensing method, including but not limited to contact dispensing, non-contact spraying, and screw valve dispensing. The area of ​​the fluorescent powder adhesive (or quantum dot adhesive) is approximately close to the area of ​​the orthogonal projection of the light source 201 onto the upper surface of the encapsulation part 202. Then, at least one curing method, such as thermosetting or ultraviolet curing, can be selected as needed to ensure that the adhesive in the encapsulation part 202 and the adhesive in the first light source auxiliary part 301 are tightly adhered together.

[0049] In some embodiments, refer to Figures 1 to 4 The first light source auxiliary part 301 at least covers the area directly above the corresponding light source 201, and the distance between the boundary of the orthographic projection of the first light source auxiliary part 301 on the substrate 10 and the boundary of the orthographic projection of the corresponding light source 201 on the substrate 10 is less than or equal to 30 micrometers. In this embodiment, the overlap between the orthographic projection of the first light source auxiliary part 301 on the substrate 10 and the orthographic projection of the corresponding light source 201 on the substrate 10 is not limited. For example, the former can completely cover the latter, or the latter can completely cover the former, or, based on the overlap, each can have a portion that does not overlap with the other.

[0050] Understandably, in this embodiment, the distance between the boundary of the orthographic projection of the first light source auxiliary part 301 on the substrate 10 and the boundary of the orthographic projection of the corresponding light source 201 on the substrate 10 is set to be less than or equal to 30 micrometers. That is, the distance between any boundary of one of them and the corresponding boundary of the other must be less than or equal to 30 micrometers. This is to avoid the orthographic projection of the first light source auxiliary part 301 on the substrate 10 exceeding the size of the orthographic projection of the corresponding light source 201 on the substrate 10 by too much, which would affect the excitation efficiency of the first light L1 emitted by the light source 201 for the color conversion layer 40, thereby reducing the amount of white light emitted by the backlight body 101 in the backlight module 100. At the same time, it can also avoid the orthographic projection of the light source 201 on the substrate 10 exceeding the size of the orthographic projection of the corresponding first light source auxiliary part 301 on the substrate 10 by too much, which would cause the first light source auxiliary part 301 to be unable to consume the first light L1 emitted directly above the light source 201 well, thereby reducing the light uniformity effect of the first light source auxiliary layer 30.

[0051] In some embodiments, refer to Figures 1 to 4 The encapsulation portion 202 covers the side and top of the corresponding light source 201, and the first light source auxiliary portion 301 is fixed to the side of the corresponding encapsulation portion 202 away from the corresponding light source 201. As discussed above, regardless of whether the light source layer 20 is manufactured using COB or POB encapsulation, the bottom of the light source 201 is covered by the substrate 10, while the sides and top of the light source 201 are covered by the encapsulation portion 202. Based on this structure, in this embodiment, after forming the light source layer 20 using the above encapsulation method, a corresponding first light source auxiliary portion 301 can be formed on the side of each encapsulation portion 202 away from the corresponding light source 201 by means of, but not limited to, dot coating, thereby fixing the position of the first light source auxiliary portion 301.

[0052] Of course, in other embodiments, the corresponding first light source auxiliary part 301 can also be formed on the side of the encapsulation part 202 close to the corresponding light source 201 by a method that is not limited to dot coating. In this application, the relative positional relationship between the first light source auxiliary part 301 and the corresponding encapsulation part 202 in the vertical direction is not limited.

[0053] In some embodiments, refer to Figures 1 to 4The distance D between two adjacent light sources 201 is greater than or equal to 4 mm and less than or equal to 6 mm. It should be noted that in conventional solutions, since the first light source auxiliary layer 30 is not provided, in order to reduce the aforementioned shadow phenomenon, the distance between two adjacent light sources 201 needs to be set sufficiently small (less than or equal to 3 mm) so that the brightness of the area above the area between two adjacent light sources 201 in the light source layer 20 is close to the brightness of the area above the area between the light sources 201. However, in this application, since the aforementioned first light source auxiliary layer 30 has been provided to reduce the aforementioned shadow phenomenon, the distance D between two adjacent light sources 201 can be set larger. This satisfies the brightness requirement while also ensuring the consistency of light intensity throughout the backlight body 101 in the backlight module 100. Simultaneously, because the distance D between two adjacent light sources 201 is larger, the number of light sources 201 in the light source layer 20 can be reduced, thereby reducing the cost of the backlight module 100.

[0054] In some embodiments, refer to Figures 4 to 5 The backlight module 100 further includes: a diffusion layer 50 located between the first light source auxiliary layer 30 and the color conversion layer 40, used to perform uniform light processing on the second light L2 and the first light L1; and a second light source auxiliary layer 60 including at least one second light source auxiliary part 6001, each second light source auxiliary part 6001 being located on a corresponding side of the diffusion layer 50, used to convert the light scattered from the side of the diffusion layer 50 into the second light L2.

[0055] The diffusion layer 50 can be formed using at least one of the following methods: volume diffusion (numerous tiny scattering particles are uniformly distributed inside the substrate) and surface diffusion (tiny uneven structures are created on the surface of the substrate through chemical or physical means). Since the light source 201 in the light source layer 20 of this application is a point light source, and the center of each light source 201 has a high brightness, the aforementioned diffusion layer 50 can hide the underlying optical structure, homogenize the second light L2 and the first light L1 emitted from the light source layer 20 and the first light source auxiliary layer 30, and soften the light, reducing glare.

[0056] Meanwhile, this embodiment takes into account that, from a top-view perspective, a portion of the first light L1 emitted from the side of the light source layer 20 that is not affected by either the first light source auxiliary layer 30 or the color conversion layer 40 to generate white second light L2 or white third light L3 (blue first light L1) escapes to the inner side of the backlight body 101 in the backlight module 100. Therefore, this embodiment provides a second light source auxiliary part 6001 on at least one side of the diffusion layer 50 to convert at least the light scattered from at least that side of the diffusion layer 50 and the light source layer 20 (i.e., the blue first light L1) into white second light L2, thereby improving the problem of the inner side of the backlight body 101 in the backlight module 100 turning blue.

[0057] Furthermore, refer to Figures 4 to 5 The second light source auxiliary layer 60 includes a plurality of second light source auxiliary parts 6001 corresponding to a plurality of sides of the diffusion layer 50, and each second light source auxiliary part 6001 is disposed corresponding to a side of the diffusion layer 50. That is, by providing a plurality of corresponding second light source auxiliary parts 6001 on a plurality of sides of the diffusion layer 50, the phenomenon of multiple inner sides of the backlight body 101 in the backlight module 100 being bluish can be improved.

[0058] As discussed above, the composition of the second light source auxiliary layer 60 can be the same as that of the first light source auxiliary layer 30, for example, including at least yellow phosphor or yellow quantum dots, so as to achieve the function of converting the blue first light L1 into the white second light L2, just like the first light source auxiliary layer 30.

[0059] Among them, reference Figures 4 to 5 The second light source auxiliary layer 60 is composed of at least one of silicone and epoxy resin. The second light source auxiliary part 6001 is strip-shaped, and the extension direction of the second light source auxiliary part 6001 is the same as the extension direction of the corresponding side of the diffusion layer 50.

[0060] Understandably, in order to allow the corresponding sides of the second light source auxiliary part 6001 and the diffusion layer 50 to be positioned relative to each other to significantly improve the bluish tint on the inner side of the backlight body 101 in the backlight module 100, in this embodiment, the second light source auxiliary part 6001 can be set as a strip, and its extension direction is the same as the extension direction of the corresponding side of the diffusion layer 50. Furthermore, in this embodiment, the constituent material of the second light source auxiliary layer 60 is also set to include at least one of silicone and epoxy resin, so that, like the first light source auxiliary layer 30, at least yellow phosphor or yellow quanta can be doped into the corresponding colloid to form a corresponding mixed material. This mixed material is further made into an adhesive material and is then adhered to the side of the backplate frame 702 near the diffusion layer 50 to form the corresponding second light source auxiliary part 6001.

[0061] In some embodiments, refer to Figures 4 to 5 The backlight module 100 further includes a reflective layer 80 located on the substrate 10 and between the plurality of light sources 201. The reflective layer 80 can perform secondary reflection on the light emitted from the side of the light source 201, the light reflected downward through the diffusion layer 50, and the light reflected inward through the second light source auxiliary part 6001, so that the light can be reused by the diffusion layer 50, thereby improving the light extraction efficiency of the backlight module 101.

[0062] Furthermore, an optical film layer 90 can be provided on the side of the color conversion layer 40 away from the substrate 10. The optical film layer 90 can be configured according to the light effect requirements of the backlight body 101, such as brightness, uniformity, viewing angle, and contrast, as well as the requirements of the display device to which the backlight body 101 is applied, such as thin and portable design, large-size display, strong outdoor light, and low-cost mass production, and the aesthetic requirements of the display device to which the backlight body 101 is applied, such as visual texture and process complexity.

[0063] For example, the optical film layer 90 may include, from bottom to top, a diffuser (for initial homogenization of light), a brightness enhancement film (for adjusting the direction and increasing the brightness of the homogenized light), and a dual brightness enhancement film (for further optimizing the polarization characteristics of light and improving the utilization efficiency of light).

[0064] For example, the optical film layer 90 can be a composite prism sheet, which may include a diffusion layer (which may be a polyethylene terephthalate substrate containing microparticles for light uniformity), a substrate layer (which may be a transparent PET film to ensure stable adhesion between the diffusion layer and the light enhancement layer), and a light enhancement layer (whose surface may be a precise V-shaped pyramid or prism array, whose core function is "directional light focusing") stacked from bottom to top.

[0065] For example, the optical film layer 90 can be a prism sheet for panel bonding, which may include an integrated polyethylene terephthalate film or polycarbonate film stacked from bottom to top, a diffusion layer (for uniform light), a brightness enhancement layer (which can be a pyramidal structure for directional light focusing), and a polarization enhancement layer (which uses a multi-layer optical film stack to selectively reflect polarized light, recover the polarized light not absorbed by the lower polarizer, and convert it back into effective light, further improving brightness and contrast). Furthermore, an anti-glare layer can be set on the polarization enhancement layer, with a slightly roughened surface to disperse ambient light, avoid glare, and improve outdoor visibility.

[0066] In some embodiments, refer to Figures 4 to 5The backlight module 100 further includes a back plate 70 for accommodating the substrate 10, the light source layer 20, the first light source auxiliary layer 30, and the color conversion layer 40. The back plate 701 is located on the side of the substrate 10 away from the light source layer 20, and a back plate frame 702 is connected to the edge of the back plate 701 and extends towards the light-emitting side of the light source layer 20. The second light source auxiliary part 6001 is fixed to the back plate frame 702 on the side near the diffusion layer 50.

[0067] Specifically, the substrate 10, reflective layer 80, light source layer 20, diffusion layer 50, color conversion layer 40, and optical film layer 90 described above can be sequentially disposed on the backplate body 701. The backplate frame 702 extends along the thickness direction of the backplate body 701 and includes the aforementioned film layers and the second light source auxiliary part 6001. In a cross-sectional view of the backlight body 101, the connected backplate body 701 and backplate frame 702 can present an "L" shape.

[0068] According to the second aspect of this application, referring to Figure 5 and Figure 6 The invention also provides a display device 200, comprising: a backlight module 100 as described in any of the preceding claims; and a display panel 600 located on the light-emitting side of the backlight module 100. The display panel 600 may be, but is not limited to, a liquid crystal panel or a self-emissive display panel. Figure 5 The above is only used as an example for illustration. The display panel 600, which is essentially a liquid crystal panel, may include an array substrate 601, a color filter substrate 602, and a liquid crystal layer 603 located between them, which are arranged opposite to each other. The voltage applied to the pixel electrode in the array substrate 601 and the voltage applied to the common electrode in the color filter substrate 602 can control the deflection angle of the liquid crystal molecules in the corresponding area of ​​the liquid crystal layer 603, thereby transmitting the corresponding amount of light generated by the backlight module 100, and combining with the filter in the color filter substrate 602 to achieve the corresponding color display.

[0069] Furthermore, refer to Figure 5 and Figure 6 The backlight module 100 in the aforementioned display device 200 further includes: a frame 400, comprising a frame body 401 located on the periphery of a plurality of sides of the backlight body 101, and a frame border 402 connected to the edge of the frame body 401 and extending toward the edge area covering the backlight body 101; and a connecting portion 500 located between the frame border 402 and the display panel 600 and used to fix the two together.

[0070] Specifically, the frame body 401 extends along the thickness direction of the back panel module 100 and includes the back panel frame 702 and the aforementioned film layer and second light source auxiliary part 6001 on its inner side. The frame frame 402 can cover the top of the back panel frame 702, the top of the second light source auxiliary part 6001, and the top of the optical film layer 90. In the cross-sectional view of the back panel module 100, the frame body 401 and the frame frame 402 connected together can present an "L" shape. The connecting part 500 may include foam adhesive for bonding the frame 400 and the display panel 600 together. The foam adhesive has a certain thickness and elasticity, which can play a good cushioning role for the display panel 600, reducing the risk of the display device 200 being damaged by shock during production and transportation.

[0071] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0072] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0073] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A backlight module, characterized in that, Includes a backlight body, the backlight body comprising: substrate; A light source layer, located on the substrate, includes multiple light sources and multiple encapsulation portions. The light sources are used to emit first light, and the light sources are encapsulated within the corresponding encapsulation portions. The first light source auxiliary layer includes a plurality of first light source auxiliary parts, wherein the first light source auxiliary parts are located above the corresponding light source and are fixedly disposed with the corresponding encapsulation part, and are used to convert the received first light into second light; A color conversion layer, located on the side of the first light source auxiliary layer away from the substrate, is used to convert the first light received from the plurality of light sources into a third light; The first light is monochromatic light, while the second and third lights are mixed-color lights of the same color.

2. The backlight module according to claim 1, characterized in that, The first light source auxiliary part covers at least directly above the corresponding light source, and the distance between the boundary of the orthographic projection of the first light source auxiliary part on the substrate and the boundary of the orthographic projection of the corresponding light source on the substrate is less than or equal to 30 micrometers.

3. The backlight module according to claim 1, characterized in that, The encapsulation portion covers the side and top of the corresponding light source, and the first light source auxiliary portion is fixed to the side of the corresponding encapsulation portion away from the corresponding light source.

4. The backlight module according to claim 1, characterized in that, The materials used to make the first light source auxiliary part and the encapsulation part both include at least one of silicone and epoxy resin.

5. The backlight module according to claim 1, characterized in that, The first light is blue, and the second and third lights are both white.

6. The backlight module according to claim 4 or 5, characterized in that, The constituent materials of the first light source auxiliary part also include phosphors or quantum dots.

7. The backlight module according to claim 6, characterized in that, The constituent materials of the first light source auxiliary part include yellow phosphor or yellow quantum dots.

8. The backlight module according to claim 7, characterized in that, The components of the first light source auxiliary part include yellow phosphor, red phosphor and green phosphor; Alternatively, the constituent materials of the first light source auxiliary part may include yellow quantum dots, red quantum dots, and green quantum dots.

9. The backlight module according to claim 1, characterized in that, The distance between two adjacent light sources is greater than or equal to 4 mm and less than or equal to 6 mm.

10. The backlight module according to claim 1, characterized in that, The backlight body also includes: A diffusion layer, located between the first light source auxiliary layer and the color conversion layer, is used to homogenize the second light and the first light. The second light source auxiliary layer includes at least one second light source auxiliary part, each of which is located on a corresponding side of the diffusion layer and is used to convert the light scattered from the side of the diffusion layer into the second light.

11. The backlight module according to claim 10, characterized in that, The second light source auxiliary layer includes a plurality of second light source auxiliary parts corresponding to a plurality of sides of the diffusion layer, and each second light source auxiliary part is disposed corresponding to a side of the diffusion layer.

12. The backlight module according to claim 10, characterized in that, The backlight body also includes: A backplate for accommodating the substrate, the light source layer, the first light source auxiliary layer and the color conversion layer, comprising a backplate body located on the side of the substrate away from the light source layer, and a backplate frame connected to the edge of the backplate body and extending towards the light-emitting side of the light source layer; The second light source auxiliary part is fixed to the side of the back plate frame near the diffusion layer.

13. The backlight module according to claim 10, characterized in that, The second light source auxiliary layer is composed of at least one of silicone and epoxy resin. The second light source auxiliary part is strip-shaped, and the extension direction of the second light source auxiliary part is the same as the extension direction of the corresponding side of the diffusion layer.

14. The backlight module according to claim 1, characterized in that, The backlight body also includes: A reflective layer is located on the substrate and between the plurality of light sources.

15. A display device, characterized in that, include: The backlight module as described in any one of claims 1-14; The display panel is located on the light-emitting side of the backlight module.

16. The display device according to claim 15, characterized in that, The backlight module also includes: The frame includes a frame body located on the periphery of multiple sides of the backlight body, and a frame border connected to the edge of the frame body and extending to the edge area covering the upper part of the backlight body. A connecting part is located between the frame and the display panel and is used to fix the two together.

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