CN218585140U - Backlight source and liquid crystal display screen - Google Patents

Abstract

The utility model relates to a backlight and liquid crystal display, have in the backlight and form Mini-LED lamp plate based on Mini-LED chip, the Mini-LED chip has advantages such as high brightness, small-size, low energy consumption, so can set up a large amount of small-size Mini-LED chips on the Mini-LED lamp plate and form the array, this not only helps promoting the luminance of backlight, and can let the lamp plate more be close to the non point source of area light source, promote the degree of consistency that the backlight goes out light; meanwhile, the characteristic of low energy consumption of the Mini-LED chip can also reduce the power consumption of the backlight source. On the other hand, blue light emitted by the Mini-LED lamp panel is filtered by the blue film, converted by the light conversion film, uniformly diffused by the diffusion assembly and brightened and extracted by the lower brightening film and the upper brightening film, so that high-brightness white light can be uniformly emitted from the light emitting surface of the optical film material, a white light area source is obtained, and the display effect of the liquid crystal display screen is enhanced.

Description

Backlight source and liquid crystal display screen

Technical Field

The utility model relates to a show technical field, especially relate to a backlight and liquid crystal display.

Background

Liquid crystal displays are passive light emitting elements and the display screen itself does not emit light but is illuminated by a backlight below it. The backlight source is one of the key components of the liquid crystal display, and how to supply sufficient light sources with uniform brightness and distribution to the liquid crystal panel, so that the liquid crystal display has a good display effect is a problem generally concerned by the display industry.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned deficiencies of the related art, an object of the present application is to provide a backlight source and a liquid crystal display panel, which aims to provide a light source with sufficient brightness and uniform distribution to the outside from the backlight source.

The present application provides a backlight, comprising: the Mini-LED lamp panel and the optical film material are arranged on the light emitting surface of the Mini-LED lamp panel; the optical film material is composed of a blue film, a light conversion film, a diffusion component, a lower brightness enhancement film and an upper brightness enhancement film which are sequentially laminated;

the Mini-LED lamp panel comprises a substrate and a plurality of blue light emitting Mini-LED chips arranged on the surface of the substrate in an array manner; light emitted by the Mini-LED lamp panel penetrates through the blue film and then enters the light conversion film for color conversion, and then sequentially penetrates through the diffusion assembly, the lower bright enhancement film and the upper bright enhancement film and then is emitted out of the optical film material; the optical film material covers all the Mini-LED chips by orthographic projection on the Mini-LED lamp panel along a projection line vertical to the substrate.

In the backlight source, the Mini-LED chip based on the blue light emitting forms the Mini-LED lamp panel, and the Mini-LED chip has the advantages of high brightness, small size, low energy consumption and the like, so a large number of small-size Mini-LED chips can be arranged on the Mini-LED lamp panel to form an array, the brightness of the backlight source is improved, the lamp panel can be closer to a non-point light source of an area light source, and the light emitting uniformity of the backlight source is improved. Meanwhile, due to the characteristic of low energy consumption of the Mini-LED chip, the power consumption of the backlight source can be reduced, and the competitiveness of the backlight source and the corresponding display screen is improved. On the other hand, blue light emitted by the Mini-LED lamp panel is filtered by the blue film, the wavelength of the light conversion film is converted, the diffusion component is uniformly diffused, and the lower brightness enhancement film and the upper brightness enhancement film are brightened and extracted, so that high-brightness white light can be uniformly emitted from the light emitting surface of the optical film material, a white light area source is obtained, and the display effect of the liquid crystal display screen is enhanced.

Optionally, the light conversion film includes a layered main film, and an enhancement film disposed on at least one surface of the main film and at an edge of the main film, both the main film and the enhancement film being configured to convert blue light into white light.

In the backlight source, the light conversion film is provided with the main film and the enhancement film positioned at the edge of the main film, the enhancement film can reinforce the light conversion capability at the edge of the main film, the blue light leaked from the edge of the light conversion film is reduced, the performance of the backlight source is improved, and the display effect of the corresponding liquid crystal display screen is enhanced.

Optionally, the host film is a quantum dot film and the enhancement film is a yellow fluorescent film.

The main film in the backlight source is the quantum dot film, the enhancement film is the yellow fluorescent film, the color gamut can be improved by adopting the quantum dot film as the main film, the edge failure problem easily caused by adopting the quantum dot film can be avoided by adopting the yellow fluorescent film as the enhancement film, and the reliability of the light conversion film is improved.

Optionally, the module frame further comprises a bottom wall and a side wall, the bottom wall and the side wall jointly enclose the accommodating groove, the Mini-LED lamp panel and the optical film are located in the accommodating groove, the inner side of the side wall is provided with a light conversion material or a reflective material, and the light conversion material is configured to convert blue light into white light.

The side wall inner side of the module frame in the backlight source is provided with the reflecting material or the light conversion material, when blue light emitted by the Mini-LED chip irradiates towards the side wall of the module frame, the blue light can be reflected to the middle of the module to obtain the treatment of the optical film material, or the blue light can be converted into white light by the light conversion material on the side wall, so that the blue light leaked from a gap between the optical film material and the module frame can be reduced, the backlight source is prevented from being provided with wider shading glue, and the reduction of the frame of the display screen while the blue leakage problem is reduced is facilitated.

Optionally, the light conversion material is a yellow phosphor material.

In the backlight source, because the yellow fluorescent powder material is arranged on the inner side of the side wall, the reliability is higher, the failure caused by high temperature, water, oxygen and the like can be avoided, and the quality of the backlight source can be improved.

Optionally, the surface of the substrate provided with the Mini-LED chip is coated with a reflective material.

In the backlight source, the surface of the substrate provided with the Mini-LED chip is coated with the reflective material, so that a reflective film can be formed, more light emitted by the Mini-LED chip can be emitted to the optical film material by the reflective film, and the final light-emitting brightness of the backlight source is improved.

Optionally, the diffusion assembly includes only one diffusion film, and the diffusion film is provided with diffusion microstructures, the positions of which correspond to the Mini-LED chips one to one.

In the backlight source, the diffusion film has the diffusion microstructures of which the positions are in one-to-one correspondence with the Mini-LED chips, so that the diffusion capability of the diffusion film to the Mini-LED chips is far superior to that of the diffusion film without the diffusion microstructures, and thus, a plurality of layers of diffusion films can be prevented from being arranged in the backlight source, the thickness of the backlight source can be reduced, and the lightness and thinness of a display screen can be realized.

Optionally, the diffusion microstructure comprises at least one of:

dot-like ink patterns printed on the surface of the diffusion film;

forming a dot-shaped atomization pattern on the surface of the diffusion film by using a light diffusion material;

the light splitting structure group is positioned on the diffusion film and comprises a plurality of three-dimensional light splitting structures.

Alternatively, the diffusion member is constituted by a first diffusion film and a second diffusion film which are laminated.

Based on the same inventive concept, the application also provides a liquid crystal display screen, which comprises a liquid crystal panel and the backlight source of any one of the liquid crystal panel, wherein the liquid crystal panel covers the light-emitting direction of the backlight source.

Above-mentioned backlight among liquid crystal display forms the Mini-LED lamp plate based on the Mini-LED chip that sends blue light, and the Mini-LED chip has advantages such as hi-lite, small-size, low energy consumption, so can set up a large amount of small-size Mini-LED chips on the Mini-LED lamp plate and form the array, this luminance that not only helps promoting the backlight, can let the lamp plate more be close to the non-pointolite of area source moreover, promotes the degree of consistency of backlight light-emitting. Meanwhile, due to the characteristic of low energy consumption of the Mini-LED chip, the power consumption of the backlight source can be reduced, and the competitiveness of the backlight source and the corresponding display screen is improved. On the other hand, blue light emitted by the Mini-LED lamp panel is sequentially filtered by the blue film, the wavelength of the light conversion film is converted, the diffusion component is uniformly diffused, and the lower brightness enhancement film and the upper brightness enhancement film are extracted, so that high-brightness white light can be uniformly emitted from the light emitting surface of the optical film material, a white light area source is obtained, and the display effect of the liquid crystal display screen is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of a backlight according to an alternative embodiment of the present invention;

fig. 2 is a schematic structural view of a Mini-LED lamp panel according to an optional embodiment of the present invention;

fig. 3a is a schematic top view of a light conversion film according to an alternative embodiment of the present invention;

fig. 3b is a schematic cross-sectional view of a light conversion film according to an alternative embodiment of the present invention;

FIG. 4 is a schematic view of a first embodiment of a diffusion membrane according to the present invention;

fig. 5 is another schematic structural diagram of a backlight according to an alternative embodiment of the present invention;

FIG. 6 is a schematic view of a second alternative embodiment of the diffusion membrane of the present invention;

FIG. 7 is a schematic view of a third alternative embodiment of a diffusion membrane according to the present invention;

FIG. 8 is a schematic view of a fourth embodiment of a diffusion membrane according to the present invention;

FIG. 9 is a schematic view of a fifth embodiment of a diffusion membrane according to the present invention;

fig. 10 is a schematic structural view of a backlight according to another alternative embodiment of the present invention;

fig. 11 is another schematic structural diagram of a backlight according to another alternative embodiment of the present invention;

fig. 12 is a schematic structural diagram of a liquid crystal display according to another alternative embodiment of the present invention.

Description of the reference numerals:

10-a backlight source; 20-Mini-LED lamp panel; 21-a substrate; 22-Mini-LED chip; 30-an optical film material; 31-blue film; 32-a light conversion film; 321-a main membrane; 322-a reinforcing film; 33-a diffusion component; 33 a-diffusion particles; 330-a diffusion membrane; 3300-diffusion microstructure; 3301-dot ink pattern; 3302-dot atomization pattern; 3303-pyramid beam splitting structure; 3304 horizontal prism structure; 331-a first diffusion membrane; 332-a second diffusion membrane; 34-a lower brightness enhancement film; 35-a bright enhancement film; 40-a module frame; 41-bottom wall; 42-a side wall; 43-fluorescent film.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Based on the fact that the performance and quality of the backlight directly affect the display effect of the lcd, it is desirable to provide a backlight with excellent performance, and the details of which will be described in the following embodiments.

An alternative embodiment of the present application:

in this embodiment, a backlight source is first provided, please refer to the schematic structural diagram of the backlight source 10 shown in fig. 1: the backlight source 10 includes a Mini-LED lamp panel 20 and an optical film 30, wherein the optical film 30 covers a light emitting surface of the Mini-LED lamp panel 20.

The optical film material 30 is formed by a plurality of film structures, in this embodiment, the optical film material 30 is formed by sequentially laminating a blue film 31, a light conversion film 32, a diffusion component 33, a lower brightness enhancement film 34 and an upper brightness enhancement film 35, and the distances between the blue film 31 and the Mini-LED lamp panel 20 are sequentially increased, that is, the blue film 31 is the layer structure closest to the Mini-LED lamp panel 20 in the optical film material 30. Therefore, the light emitted from the Mini-LED lamp panel 20 passes through the blue film 31, the light conversion film 32, the diffusion unit 33, the lower brightness enhancement film 34, and the upper brightness enhancement film 35 in sequence, and then exits the backlight 10.

The Blue Light Transmitting mirror film (BLT) 31 functions to allow Blue Light to pass through and prevent other colors of Light from passing through; the light conversion film 32 is used for emitting light after wavelength conversion of the light incident therein, that is, performing color conversion on the light, and may include at least one of a phosphor material and a quantum dot material. The diffusion component 33 mainly functions to uniformly diffuse the light rays emitted therein; the lower brightness enhancement film 34 and the upper brightness enhancement film 35 are mainly used for enhancing brightness, and extracting as much white light as possible from the light-emitting surface of the backlight 10, thereby increasing the brightness of the light emitted from the light-emitting surface of the backlight 10.

The Mini-LED lamp panel 20 includes a substrate 21 and a plurality of Mini-LED chips 22 disposed on the substrate 21. In this embodiment, the substrate 21 may be a hard substrate or a flexible substrate, where when the substrate 21 is a hard substrate, the substrate includes, but is not limited to, any one of a glass substrate, a sapphire substrate, and a PCB (Printed Circuit Board); when the substrate 21 is a Flexible substrate, it may be implemented by using an FPC (Flexible Printed Circuit).

The Mini-LED chip 22 refers to an LED chip with a size of 50-200 μm, and the Mini-LED chip 22 used in this embodiment is a blue chip, which may be a gallium nitride-based chip. The Mini-LED chip 22 may have any one of a flip-chip structure, a face-up structure, and a vertical structure. In some examples, to reduce the thickness of the backlight 10, to reduce the OD (Optical Distance) between the Optical film 30 and the Mini-LED panel 20, or even to achieve 0OD, the Mini-LED chip 22 may be flip-chip configured, such that the Optical film 30 is directly disposed on the Mini-LED panel 20 to achieve 0OD. The Mini-LED chips 22 are arranged in an array on one surface of the substrate 21, and a driving circuit electrically connected to the Mini-LED chips 22 is disposed on the substrate 21. In some examples of the present embodiment, the rows of the chip array formed by the plurality of Mini-LED chips 22 are along the length direction of the substrate 21, and the columns are along the width of the substrate 21, as shown in fig. 2. Of course, in some other examples of the present embodiment, the rows and the columns of the chip array may be along other directions.

In some examples of the present embodiment, in order to reduce the loss of the light emitted by the Mini-LED chip 22 and improve the light extraction efficiency of the backlight 10, a reflective film is formed by disposing a reflective material on the surface of the substrate 21 on which the Mini-LED chip 22 is disposed, and the reflective film is used to emit more light emitted by the Mini-LED chip 22 to the optical film material 30, so as to improve the final light extraction brightness of the backlight 10.

It can be understood that the optical film 30 should cover the Mini-LED lamp panel 20 as completely as possible, for example, the orthographic projection of the optical film 30 on the lamp panel 20 along the projection line perpendicular to the substrate 21 covers all the Mini-LED chips 22, so that the light emitted from the Mini-LED lamp panel 20 can be emitted to the optical film 30 as far as possible, and the optical film 30 filters, converts, diffuses and the like the light as much as possible. In some examples of this embodiment, the area of the orthographic projection of the optical film 30 on the Mini-LED lamp panel 20 along the projection line perpendicular to the substrate 21 is larger than the area of the array of the Mini-LED chips 22 on the Mini-LED lamp panel 20, and even the area of the orthographic projection of the optical film 30 on the Mini-LED lamp panel 20 along the projection line perpendicular to the substrate 21 may be slightly larger than the area of the Mini-LED lamp panel 20.

In some examples of the present embodiment, the light conversion film 32 is a quantum dot film, and in other examples, the light conversion film 32 may be a fluorescent film. In still other examples, the light conversion film 32 may be a composite film layer, i.e., a fluorescent film and a quantum dot film are combined together. In the present embodiment, even if the light conversion film 32 is a composite film layer, each of the composite film layers is a film layer having a light conversion function.

It is understood that the edge of the light conversion film 32 is easily damaged, for example, cutting of the film material and water and oxygen erosion all affect the reliability of the light conversion material in the light conversion film, and further the light conversion capability of the edge of the light conversion film 32 is reduced or even completely lost, which may result in that the light conversion film 32 cannot convert all the blue light at the edge into white light, so that a large amount of blue light may leak from the edge of the backlight 10, and affect the quality of the backlight 10 and the lcd. In view of this situation, the light conversion capability of the edge of the light conversion film 32 can be reinforced in the present embodiment, for example, in some examples of the present embodiment, the light conversion film 32 has a main film 321 and a reinforcing film 322, as shown in fig. 3a and fig. 3 b: the reinforcing film 322 is disposed on at least one surface of the main film 321, and is located at an edge region of the main film. It should be understood that the edge region of the main membrane 321 is a concept opposite to the middle region thereof, and the edge region is a region surrounding the middle region. Both the main film 321 and the enhancement film 322 are used to convert blue light into white light.

In some examples, the main film 321 is a quantum dot film formed by quantum dot, and quantum dots (quantum dots) are a nano-scale semiconductor, and they emit light of a specific frequency by applying a certain electric field or light pressure to the nano-semiconductor material, and the frequency of the emitted light changes with the change of the size of the semiconductor, so that the color of the emitted light can be controlled by adjusting the size of the nano-semiconductor. Quantum dot materials have the advantage of a wide color gamut, which can be increased from 70% of the color gamut (NTSC standard) to 100% (NTSC standard), and thus have a wide application in both lighting and display applications. However, it should be understood by those skilled in the art that the main film 321 may be replaced by a quantum dot film instead of a fluorescent film formed of fluorescent paste.

Optionally, the enhancement film 322 may be a quantum dot film or a fluorescent film, but considering that the quantum dot material is more easily damaged and influenced by high temperature than the phosphor material, in some examples of the embodiment, the enhancement film 322 may be a fluorescent film, for example, the enhancement film 322 is a photochromic fluorescent film. In some examples of the embodiment, the enhancement film 322 may be directly formed on the main film 321, for example, a main film may be first provided, and then the light conversion adhesive (e.g., phosphor adhesive) may be coated and printed on the periphery of the surface of the main film 321, and after the light conversion adhesive is cured, the enhancement film 322 attached to the main film 321 may be formed. In other examples, the reinforcing film 322 may be formed on another substrate in advance and then bonded to the peripheral edge of the main film 321 by a glue layer.

The diffusion member 33 is formed of a diffusion film material having a uniform diffusion function for light, and diffusion particles are dispersed in the diffusion film material, as shown in fig. 4. The diffusion particles 33a are uniformly dispersed in the diffusion film material, and light incident on the diffusion particles 33a is refracted, reflected, or scattered in different directions to change the optical path, and the diffusion particles 33a may be an organic material or an inorganic material. In some examples, in order to better diffuse light and improve the uniformity of the light emitted from the backlight 10, a plurality of diffusion films are disposed in the diffusion assembly 33. However, in some examples of the present embodiment, the number of diffusion films in the diffusion member 33 is not more than two. For example, in an example, the diffusion component 33 is formed by laminating a first diffusion film 331 and a second diffusion film 332, please refer to a structural diagram of the backlight 10 shown in fig. 5. In still other examples, only one diffuser assembly 330 is provided within diffuser assembly 33, as shown with continued reference to FIG. 1, although at least one surface of diffuser assembly 330 is provided with diffusing microstructures 3300. The position of the diffusion microstructure 3300 corresponds to the Mini-LED chip 22 on the Mini-LED lamp panel 20, and the light path of the light can be changed by refracting, reflecting, scattering, etc. the light, so that the light emitted by the Mini-LED chip 22 is dispersed more uniformly. It is to be understood that, since the diffusion film 330 is a layered structure having a small thickness, the two surfaces of the diffusion film 330, which are opposite to each other and have a large area, are referred to as the surfaces in the present embodiment, and do not include the side surfaces between the two surfaces.

In an example of the present embodiment, the diffusion microstructures 3300 are distributed in an independent point shape or a block shape, and correspond to the Mini-LED chips 22 one by one, and a microstructure array corresponding to the chip array is formed on the surface of the diffusion film 330, as shown in fig. 6. Of course, it will be understood by those skilled in the art that in some examples, there may be no one-to-one correspondence between at least some of the diffusion microstructures 3300 and the Mini-LED chips 22 on the diffusion film 330, for example, one diffusion microstructure 3300 may correspond to two or more adjacent Mini-LED chips 22 at the same time.

In some examples of the present embodiment, the diffusion microstructures 3300 may be dot-shaped ink patterns 3301 printed on the surface of the diffusion film 330, please continue to refer to fig. 6, alternatively, the dot-shaped ink patterns 3301 may be formed by white ink, but it is understood that in other examples, other color coatings formed on the surface of the diffusion film 330 by using printing materials of other colors are also feasible.

In other examples of the embodiment, the diffusing microstructures 3300 may be formed by using a light diffusing material, such as a dot-like atomized pattern 3302 formed on the surface of the diffusing film 330 by printing, coating, etc., as shown in fig. 7, the light diffusing material includes a light diffusing glue, which includes diffusing particles or a light diffusing agent.

In still other examples, the diffusing microstructures 3300 may be clusters of light-splitting structures on the diffusing film 330, and as shown in fig. 4, one cluster of light-splitting structures includes a plurality of three-dimensional light-splitting structures, and the light-splitting structures have a light-splitting effect. In the corresponding diffusion film 330 of fig. 4, the light splitting structures are pyramid light splitting structures 3303, and a plurality of pyramid light splitting structures 3303 are gathered into a group to form a diffusion microstructure 3300. The pyramid light splitting structure 3303 includes, but is not limited to, a convex structure in the form of a triangular pyramid, a rectangular pyramid, a pentagonal pyramid, and the like. In another example, the light splitting structure in the diffusing microstructure 3300 may be a horizontal prism light splitting structure 3304, as shown in fig. 8, the horizontal prism light splitting structure 3304 refers to a prism-shaped protrusion with a bottom surface perpendicular to the plane of the diffusing film 330 and an axial direction (i.e., a height direction) parallel to the plane of the diffusing film 330. Alternatively, the prismatic protrusions corresponding to the horizontal prismatic light splitting structure 3304 may include, but are not limited to, a triangular prism, a quadrangular prism, a pentagonal prism, and the like.

In some examples of this embodiment, the diffusion microstructures 3300 are disposed on only one surface of the diffusion film 330, for example, on the surface of the diffusion film 330 facing the Mini-LED lamp panel 20, or on the surface of the diffusion film 330 facing away from the Mini-LED lamp panel 20. In still other examples, the diffusion microstructures 3300 are distributed on both surfaces of the diffusion membrane 330 simultaneously. In some examples, all the diffusing microstructures 3300 disposed on the diffusing film 330 are the same, for example, all the diffusing microstructures 3300 on the whole diffusing film 330 are dot-like ink patterns 3301, or the diffusing film 330 is disposed with a light splitting structure group formed by pyramid light splitting structures 3303 only on the side far from the Mini-LED lamp panel 20. In other examples, two or more types of diffusion microstructures may be disposed on the diffusion film 330, for example, in the diffusion film 330 shown in fig. 9, the upper surface is disposed with the dot-like atomized pattern 3302, and the lower surface is disposed with the light splitting structure clusters formed by the pyramid light splitting structures 3303.

It is understood that the shape of the diffusion microstructure 3300 may be regular, such as rectangular or circular, regular, such as diamond, trapezoid or oval, or irregular. In some examples of the present embodiment, the profile shape of the diffusing microstructure 3300 is the same as the profile shape of the light emitting face of the Mini-LED chip 22. In addition, in the present embodiment, the area of the diffusion microstructure 3300 may be larger than or equal to the area of the light emitting surface of the corresponding Mini-LED chip 22, but it can be understood by those skilled in the art that the area of the diffusion microstructure 3300 may be slightly smaller than the area of the light emitting surface of the corresponding Mini-LED chip 22.

As can be understood by those skilled in the art, since the diffusion film 330 has the diffusion microstructures 3300, the uniform diffusion capability of the diffusion film 330 to light is far better than that of a diffusion film without diffusion microstructures, and the diffusion capability of one diffusion film 330 to light can be equivalent to that of a plurality of common diffusion films, so that a plurality of diffusion films can be prevented from being arranged in the backlight 330, which is beneficial to reducing the thickness of the backlight 10 and realizing the lightness and thinness of the liquid crystal display.

It is needless to say that when the diffusion film is not only one sheet in the diffusion member 33, the diffusion microstructures may be provided on the surface of a part of the diffusion film or the entire diffusion film. However, in general, if the number of the diffusion film materials is more than one, the diffusion member may have a good light diffusion capability even if the diffusion microstructures 3300 are not provided on the diffusion film material, and therefore, in these cases, it is not necessary to provide the diffusion microstructures 3300 on the surface of the diffusion film material for the reason of reducing the cost of the backlight 10 and the like.

In the backlight 10 provided by the embodiment, the lamp panel is formed by the Mini-LED chip 22, so that the light-emitting brightness and light-emitting uniformity of the backlight 10 are improved, and the power consumption of the backlight 10 is reduced; moreover, because the light conversion film 32 in the optical film material 30 has the main film 321 and the enhancement film 322 capable of improving the light conversion capability of the edge of the main film 321, the light conversion efficiency of the light conversion film 32 is improved, and the phenomenon of leakage of blue light at the edge is reduced. Meanwhile, in the diffusion component, the light diffusion capability of a single diffusion film can be improved by arranging the diffusion microstructures on the surface of the diffusion film, which is not only beneficial to improving the light-emitting uniformity of the backlight source 10, but also can reduce the thickness of the backlight source 10.

Another alternative embodiment of the present application:

the present embodiment will be further explained with reference to the example that the backlight 10 in the foregoing embodiment:

generally, the backlight 10 further has a module frame, please refer to a schematic structural diagram of the backlight 10 shown in fig. 10: the backlight source 10 includes a Mini-LED lamp panel 20 and an optical film 30 located on a light-emitting surface of the Mini-LED lamp panel 20, and in addition, the backlight source 10 further includes a module frame 40. The optical film material 30 is composed of a blue film 31, a light conversion film 32, a diffusion unit 33, a lower brightness enhancement film 34, and an upper brightness enhancement film 35, which are laminated. The specific structure of the optical film 30 can be referred to the description of the foregoing examples, and will not be described herein. The module frame 40 has a bottom wall 41 and a side wall 42, the side wall 42 and the bottom wall 41 form a groove structure, and the groove structure has an accommodating groove for accommodating the Mini-LED lamp panel 20 and the optical film, please refer to fig. 10, in which the Mini-LED lamp panel 20 and the optical film are both disposed in the module frame 40.

In some examples of the present embodiment, a light conversion material may be disposed on an inner surface of the sidewall 42, and blue light emitted to the sidewall 42 is converted by the light conversion material, and in some examples of the present embodiment, the light conversion material disposed on the inner surface of the sidewall 42 may be a quantum dot material. In other examples of the present embodiment, the light conversion material disposed on the inner surface of the sidewall 42 may be a phosphor material, such as a yellow phosphor material, considering that the quantum dot material is prone to failure due to high temperature, water and oxygen corrosion, and the like. Please refer to fig. 11, which shows a schematic structural diagram of the backlight 10: the phosphor material is present in the form of a phosphor film 43 on the inner surface of the sidewall of the module frame 40, and the blue light directed to the phosphor film 43 is converted into blue light. In some examples of the present embodiment, the fluorescent film 43 may be formed by yellow fluorescent powder, and in other examples of the present embodiment, the fluorescent film 43 may also include red fluorescent powder and green fluorescent powder mixed therein. It can be understood that the fluorescent film 43 can be directly formed on the sidewall 42 of the module frame 40 by spraying fluorescent glue, or can be attached to the sidewall 42 of the module frame 40 after forming a film structure on another substrate plane in advance.

In some examples of the embodiment, the fluorescent film 43 on the sidewall 42 of the module frame 40 may be replaced by a reflective layer, and the reflective layer is formed by a reflective material (e.g., a metal material with good reflection), so that the light emitted to the sidewall 42 is reflected back to the middle area of the module frame 40, and if the reflected light is blue light, the blue light has an opportunity to be emitted to the middle area of the light conversion film 32 to be converted.

In the backlight 10 shown in fig. 10, the diffusion member 33 is composed of a first diffusion film 331 and a second diffusion film 332 which are stacked, and in one example, no diffusion microstructures corresponding to the Mini-LED chips 22 are provided on the surfaces of the first diffusion film 331 and the second diffusion film 332; in another example, at least one of the first and second diffusion films 331 and 332 is provided with diffusion microstructures corresponding to the Mini-LED chips 22 one to one. In the backlight 10 shown in fig. 11, the diffusion member 33 is composed of a single diffusion film 330, and the diffusion film 330 has diffusion microstructures on both the upper and lower surfaces, for example, the lower surface is provided with dot-like fogging patterns 3301, and the upper surface is provided with a cluster of light-splitting structures formed by pyramid light-splitting structures 3303.

The light conversion film 32 includes a main film 321 formed by quantum dot material and an enhancement film 322 formed by phosphor material, and in fig. 10 and 11, the enhancement film 322 is located on the upper surface of the main film 321, but it can be understood by those skilled in the art that in other examples, the enhancement film 322 can be disposed on both the upper and lower surfaces of the main film 321.

As shown in fig. 12, the liquid crystal display 120 includes a liquid crystal panel 12 and the backlight 10 provided in any of the foregoing examples, where the liquid crystal panel may be disposed in a light emitting direction of the backlight 10.

It is understood that the liquid crystal display 120 may further include, in addition to the liquid crystal panel 12 and the backlight 10, a transparent protective cover, which is disposed on a side of the liquid crystal panel 12 away from the backlight 10 and is used for protecting the liquid crystal panel 12.

The liquid crystal display 120 may be applied to various electronic devices, such as, but not limited to, a television, a desktop computer, a notebook computer, a mobile phone, a wearable device, a vehicle-mounted device, and the like.

It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims (10)

1. A backlight, comprising: the Mini-LED lamp panel and the optical film material are arranged on the light emitting surface of the Mini-LED lamp panel; the optical film material is composed of a blue film, a light conversion film, a diffusion component, a lower brightness enhancement film and an upper brightness enhancement film which are sequentially stacked;

the Mini-LED lamp panel comprises a substrate and a plurality of blue light emitting Mini-LED chips arranged on the surface of the substrate in an array manner; light emitted by the Mini-LED lamp panel penetrates through the blue film and then enters the light conversion film for color conversion, and then sequentially penetrates through the diffusion assembly, the lower brightness enhancement film and the upper brightness enhancement film and then enters the outside of the optical film material; the optical film material covers all the Mini-LED chips through orthographic projection on the Mini-LED lamp panel along a projection line perpendicular to the substrate.

2. The backlight of claim 1, wherein the light conversion film comprises a layered primary film and an enhancement film disposed on at least one surface of the primary film at an edge of the primary film, the primary film and the enhancement film each configured to convert blue light to white light.

3. The backlight of claim 2, wherein the primary film is a quantum dot film and the enhancement film is a yellow phosphor film.

4. The backlight of claim 1, further comprising a module frame, wherein the module frame comprises a bottom wall and a side wall, the bottom wall and the side wall jointly enclose a receiving groove, the Mini-LED lamp panel and the optical film are located in the receiving groove, a light conversion material or a reflective material is disposed on an inner side of the side wall, and the light conversion material is configured to convert blue light into white light.

5. The backlight of claim 4, wherein the light conversion material is a yellow phosphor material.

6. The backlight of claim 1, wherein the surface of the substrate on which the Mini-LED chips are disposed is coated with a light reflecting material.

7. The backlight source of any one of claims 1 to 6, wherein the diffuser assembly comprises only one diffuser film, and the diffuser film is provided with diffuser microstructures located in one-to-one correspondence with the Mini-LED chips.

8. The backlight of claim 7, wherein the diffusing microstructures comprise at least one of:

dot-like ink patterns printed on the surface of the diffusion film;

a dot-like atomization pattern formed on the surface of the diffusion film by using a light diffusion material;

and the light splitting structure group is positioned on the diffusion film and comprises a plurality of three-dimensional light splitting structures.

9. The backlight according to any one of claims 1 to 6, wherein the diffusion member is composed of a first diffusion film and a second diffusion film which are laminated.

10. A liquid crystal display panel, comprising a liquid crystal panel and the backlight source according to any one of claims 1 to 9, wherein the liquid crystal panel covers the light-emitting direction of the backlight source.

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