Mini LED backlight source and backlight module thereof

Abstract

This invention discloses a Mini LED backlight and its backlight module, comprising a circuit board, several chips, and an optical layer. The chips and optical layer are fixed above the circuit board, with the optical layer covering the chips. The chips and optical layer constitute independent light-emitting units. The optical layer includes a first optical layer…annth optical layer stacked sequentially from the inside out, all of which are fixedly connected to the circuit board. Each of the first…annth optical layer contains filling particles. The angle between the first curved segment and the circuit board is θ1; the angle between the second curved segment and the circuit board is θ2; the angle between the external tangent of the third starting point of the third curved segment and the circuit board is θ3. The relationship between angles θ1, θ2, and θ3 is: θ3 > θ2 > θ1. In this invention's Mini LED backlight and its backlight module, increasing the light emission angle provides the advantages of preventing dark stripes and ensuring uniform light color.

Description

A Mini LED backlight and its backlight module Technical Field

[0001] This invention belongs to the field of LED technology, specifically relating to a Mini LED backlight and its backlight module. Background Technology

[0002] LED backlight dynamic dimming technology boasts high contrast and excellent display effects, gradually becoming a hot topic in the LED backlight product market. Dynamic dimming technology achieves this by controlling multiple light sources through multiple zones, requiring the use of an entire printed circuit board, which is expensive. Therefore, how to quickly reduce costs has become an important research and development direction.

[0003] Existing LED backlight dynamic dimming technology reduces LED size to 300µm (Mini LED) and increases the angle of the point light source LED, thus reducing the number of LEDs and effectively lowering costs. The primary optical layer effectively refracts the point light emitted by the LED in all directions, increasing the angle. However, the primary optical layer has high requirements for formability. While utilizing the high thixotropy of the optical layer can achieve good optical effects, this high thixotropy makes bubble problems more severe. Furthermore, increasing the angle of the current optical layer easily leads to dark lines and issues with light color uniformity.

[0004] Therefore, a Mini LED backlight and its backlight module are provided to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a Mini LED backlight and its backlight module, aiming to solve the problems of dark stripes and uneven light color caused by increasing the light emission angle.

[0006] The present invention adopts the following technical solution:

[0007] A Mini LED backlight includes a circuit board, several chips, and an optical layer;

[0008] The plurality of chips and the optical layer are fixed above the circuit board, the optical layer covers the chips, and the plurality of chips and the optical layer constitute an independent light-emitting unit;

[0009] The optical layer includes a first optical layer... an nth optical layer stacked sequentially from the inside out, and the first optical layer... the nth optical layer are all fixedly connected to the circuit board. Each of the first optical layer... the nth optical layer contains filler particles.

[0010] The optical layer is provided with a continuous first refractive part, a second refractive part and a third refractive part, wherein the first refractive part is located at the connection between the circuit board and the optical layer;

[0011] The first refractive part includes a first starting point and a first ending point. The line connecting the first starting point and the first ending point forms a first curved segment. The angle between the first curved segment and the circuit board is θ1.

[0012] The second refractive part includes a second starting point and a second ending point. The line connecting the second starting point and the second ending point forms a second curved segment. The first ending point coincides with the second starting point. The angle between the second curved segment and the circuit board is θ2.

[0013] The third refractive section includes a third starting point and a third ending point. The line connecting the third starting point and the third ending point forms a third curve segment. The second ending point coincides with the third starting point. The third ending point is the center vertex of the optical layer. The angle between the external tangent of the third starting point in the third curve segment and the circuit board is θ3.

[0014] The relationship between the included angles θ1, θ2, and θ3 is as follows:

[0015] θ3>θ2>θ1.

[0016] As a further improvement to the technical solution of the present invention, the first curve segment and the second curve segment are both nearly linear curve segments, and the third curve segment is an arc-shaped curve segment.

[0017] As a further improvement to the technical solution of the present invention, the ratio of the distance H from the third endpoint to the circuit board to the distance R from the first starting point to the foot of the perpendicular from the third endpoint is 0.4-1.0.

[0018] As a further improvement to the technical solution of the present invention, the optical layer material is composed of one or more of silicone rubber, silicone resin, and epoxy resin.

[0019] As a further improvement to the technical solution of the present invention, the filling particle concentration of the nth optical layer is greater than, but greater than, the filling particle concentration of the first optical layer, and the thixotropy of the nth optical layer is greater than, but greater than, the thixotropy of the first optical layer. The filling particle concentration determines the thixotropy of the optical layer.

[0020] As a further improvement to the technical solution of the present invention, the filling particles are semi-transparent particles.

[0021] As a further improvement to the technical solution of the present invention, the chip further includes a connection layer, the connection layer is fixedly connected to the circuit board, and the plurality of chips are arranged in an array on the circuit board;

[0022] The connection layer includes a positive electrode and a negative electrode, both of which are electrically connected to the circuit board.

[0023] A Mini LED backlight and its backlight module, comprising a Mini LED backlight as described in any one of claims 1-7, a cavity surrounding the Mini LED backlight, and a light outlet, wherein the light outlet is located at the end of the cavity away from the Mini LED backlight and covers the cavity.

[0024] As a further improvement to the technical solution of the present invention, the cavity includes a reflective film and a driving component. The reflective film is laid between the gaps of the light-emitting units, and the driving component is electrically connected to the light-emitting units.

[0025] As a further improvement to the technical solution of the present invention, the light outlet is provided with a diffuser plate, a light conversion layer and an optical film stacked sequentially from the inside to the outside.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The Mini LED backlight and its backlight module proposed in this invention increase the emission angle by setting an optical layer at the light-emitting unit. The use of multiple optical layers improves the bubble problem caused by thixotropy in the optical layers. Particles are filled within the multiple optical layers, utilizing the scattering effect of the particles. Furthermore, by setting continuous first, second, and third refractive sections within the optical layers, the angle θ3 between the external tangent of the third starting point of the third refractive section and the circuit board is satisfied: θ3 > θ2 > θ1. Through the scattering effect of the filling particles and the refraction of light by the first, second, and third refractive sections, the problem of dark lines in the module is effectively improved, achieving uniform light emission from the backlight. This Mini LED backlight and its backlight module exhibit the characteristics of no dark lines and uniform light color when the emission angle is increased. Attached Figure Description

[0028] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 is a front view of a single optical layer in a Mini LED backlight;

[0030] Figure 2 is an enlarged view of point A in Figure 3.

[0031] Figure 3 is a front view of the double-layer optical layer in the Mini LED backlight;

[0032] Figure 4 is a front view of the double-layer optical layer in the Mini LED backlight;

[0033] Figure 5 is a front view of the three optical layers in the Mini LED backlight;

[0034] Figure 6 is a top view of the Mini LED backlight;

[0035] Figure 7 is a front view of the Mini LED backlight;

[0036] Figure 8 is a front view of the Mini LED backlight module.

[0037] Figure label:

[0038] 1. Circuit board;

[0039] 2. Chip; 21. Connector layer; 211. Positive electrode; 212. Negative electrode; 23. Transparent layer; 24. Reflective layer;

[0040] 3. Optical layer; 31. First optical layer; 32. Second optical layer; 33. Third optical layer; 34. First refractive section; 341. First starting point; 342. First ending point; 35. Second refractive section; 351. Second starting point; 352. Second ending point; 36. Third refractive section; 361. Third starting point; 362. Third ending point;

[0041] 4. Cavity; 41. Reflective film; 42. Driving component;

[0042] 5. Light outlet; 51. Diffuser plate; 52. Light conversion layer; 53. Optical film layer;

[0043] 6. Light-emitting unit. Detailed Implementation

[0044] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0045] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0046] Referring to Figures 1 to 6, a Mini LED backlight and its backlight module include: a circuit board 1, several chips 2 and an optical layer 3;

[0047] Several chips 2 and an optical layer 3 are fixed above the circuit board 1. The optical layer 3 covers the chips 2, and the size of the chips 2 is 200*300um. Several chips 2 and the optical layer 3 constitute an independent light-emitting unit 6. The optical layer 3 includes a first optical layer 31...nth optical layer 3 stacked sequentially from the inside to the outside. The first optical layer 31...nth optical layer 3 are all fixedly connected to the circuit board 1. Each of the first optical layer 31...nth optical layer 3 contains filling particles. The optical layer 3 has a continuous first refractive part 34, a second refractive part 35 and a third refractive part 36. The first refractive part 34 is located at the connection between the circuit board 1 and the optical layer 3. The first refractive part 34 includes a first starting point 341 and a first ending point 342. The line connecting the first starting point 341 and the first ending point 342 forms a first curved segment. The first curved segment has an angle of θ1 with the circuit board 1; the second refractive part 35 includes a second starting point 351 and a second ending point 352, the line connecting the second starting point 351 and the second ending point 352 forms the second curved segment, the first ending point 342 coincides with the second starting point 351, and the angle between the second curved segment and the circuit board 1 is θ2; the third refractive part 36 includes a third starting point 361 and a third ending point 362, the line connecting the third starting point 361 and the third ending point 362 forms the third curved segment, the second ending point 352 coincides with the third starting point 361, the third ending point 362 is the center vertex of the optical layer 3, and the angle between the external tangent of the third starting point 361 in the third curved segment and the circuit board 1 is θ3; similarly, the size relationship of the included angles θ1, θ2 and θ3 is as follows: θ3 > θ2 > θ1.

[0048] Specifically, by setting an optical layer 3 at the light-emitting unit 6 to increase its emission angle, the use of multiple optical layers 3 improves the bubble problem caused by the thixotropic nature of the optical layer 3. Particles are filled within the multiple optical layers 3, utilizing the scattering effect of the particles. Furthermore, by setting continuous first refractive sections 34, second refractive sections 35, and third refractive sections 36 within the optical layers 3, the angle θ3 between the outer tangent of the third starting point 361 of the third refractive section 36 and the circuit board 1 is satisfied: θ3 > θ2 > θ1. Through the scattering effect of the particles and the refraction of light by the first, second, and third refractive sections 34, 35, and 36, the problem of dark lines in the module is effectively improved, achieving uniform light emission from the backlight. This Mini LED backlight and its backlight module exhibit the characteristics of no dark lines and uniform light color when the emission angle is increased.

[0049] In one embodiment, the first and second curve segments are both nearly linear curve segments, and the third curve segment is an arc-shaped curve segment; the ratio of the distance H from the third endpoint 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third endpoint 362 is 0.4-1.0.

[0050] In one embodiment, the particle concentration of the nth optical layer 3 is greater than, but greater than, the particle concentration of the first optical layer 31, and the thixotropy of the nth optical layer 3 is greater than, but greater than, the thixotropy of the first optical layer 31. The particle concentration determines the thixotropy of the optical layer 3. The lower thixotropy of the first optical layer 31 is more conducive to the removal of bubbles in the optical layer 3. A higher concentration of particles can, on the one hand, increase the ratio of the height H of the optical layer 3 to the diameter D of the circle formed by the outermost edge of the optical layer 3, and on the other hand, help to improve the dark stripe above the chip 2. The optical layer 3 is also provided with particles that can improve thixotropy. The material of the optical layer 3 is composed of one or more of silicone rubber, silicone resin, and epoxy resin. The particles are semi-transparent particles, and the particles are SiO2, ZrO2, and TiO2.

[0051] In one embodiment, the chip 2 further includes a connection layer 21, which is soldered and fixedly connected to the circuit board 1. Several chips 2 are arranged in an array on the circuit board 1. The connection layer 21 includes a positive electrode 211 and a negative electrode 212, both of which are electrically connected to the circuit board 1. A light-transmitting layer 23 and a reflective layer 24 are sequentially deposited on the surface of the chip 2. One end face of the light-transmitting layer 23 is fixedly connected to the surface of the chip 2, and the end face of the light-transmitting layer 23 facing away from the chip 2 is fixedly connected to the reflective layer 24. The reflective layer 24 is a Bragg reflective layer 24, which is more conducive to increasing the light emission angle of the chip 2.

[0052] A Mini LED backlight module includes the aforementioned Mini LED backlight source, cavity 4, and light outlet 5;

[0053] The cavity 4 is surrounded by a Mini LED backlight, and the light outlet 5 is located at the end of the cavity 4 away from the Mini LED backlight and covers the cavity 4. The cavity 4 includes a reflective film 41 and a driving element 42. The reflective film 41 is laid between the gaps of the light emission unit 6, and the driving element 42 is electrically connected to the light emission unit 6.

[0054] In one embodiment, the light outlet 5 is provided with a diffuser plate 51, a light conversion layer 52 and an optical film stacked sequentially from the inside to the outside.

[0055] Example 1

[0056] This embodiment discloses a Mini LED backlight, which consists of a circuit board 1, several chips 2 and a first optical layer 31; the several chips 2 and the first optical layer 31 are fixed above the circuit board 1, and the first optical layer 31 covers the entire chip 2.

[0057] The first refractive section 34 includes a first starting point 341 and a first ending point 342. The line connecting the first starting point 341 and the first ending point 342 forms a first curved segment, and the angle θ1 between the first curved segment and the circuit board 1 is 34°. The second refractive section 35 includes a second starting point 351 and a second ending point 352. The line connecting the second starting point 351 and the second ending point 352 forms a second curved segment. The first ending point 342 coincides with the second starting point 351, and the angle θ2 between the second curved segment and the circuit board 1 is 57°. The third refractive section 36 includes a third starting point 361 and a third ending point 362. The line connecting the third starting point 361 and the third ending point 362 forms a third curved segment. The second ending point 352 coincides with the third starting point 361, and the third ending point 362 is the center vertex of the optical layer 3. The angle θ3 between the external tangent of the third starting point 361 in the third curved segment and the circuit board 1 is 67°. θ3 > θ2 > θ1.

[0058] At this time, the ratio of the distance H from the third endpoint 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third endpoint 362 is 0.6. The material of the first optical layer 31 is composed of silicone rubber, and the filling particle material provided in the first optical layer 31 is SiO2, which can improve the thixotropic properties of the first optical layer 31.

[0059] Example 2

[0060] This embodiment discloses a Mini LED backlight, which consists of a circuit board 1, several chips 2, a first optical layer 31 and a second optical layer 32. Several chips 2, the first optical layer 31 and the second optical layer 32 are fixed on the circuit board 1. The first optical layer 31 covers the entire chip 2, the second optical layer 32 covers the first optical layer 31, and a reflective layer 24 is laid on the chip 2.

[0061] The first refractive section 34 includes a first starting point 341 and a first ending point 342. The line connecting the first starting point 341 and the first ending point 342 forms a first curved segment, and the angle between the first curved segment and the circuit board 1 is θ1. The second refractive section 35 includes a second starting point 351 and a second ending point 352. The line connecting the second starting point 351 and the second ending point 352 forms a second curved segment. The first ending point 342 coincides with the second starting point 351, and the angle between the second curved segment and the circuit board 1 is θ2. The third refractive section 36 includes a third starting point 361 and a third ending point 362. The line connecting point 361 to the third endpoint 362 forms the third curve segment. The second endpoint 352 coincides with the third starting point 361. The third endpoint 362 is the central vertex of the optical layer 3. The angle between the external tangent of the third starting point 361 in the third curve segment and the circuit board 1 is θ3. The first optical layer 31 has θ1 of 35°, θ2 of 54°, and θ3 of 69°. The second optical layer 32 has θ1 of 50°, θ2 of 70°, and θ3 of 80°. The reflective layer 24 is a Bragg reflective layer 24, which helps to increase the light emission angle of the chip 2.

[0062] At this time, in the first optical layer 31, the ratio of the distance H from the third endpoint 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third endpoint 362 is 0.4; in the second optical layer 32, the ratio of the distance H from the third endpoint 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third endpoint 362 is 0.66; the material of the first optical layer 31 is composed of silicone rubber, and the material of the second optical layer 32 is composed of silicone resin. The first optical layer 31 does not contain filling particles, and the filling particle material provided in the second optical layer 32 is SiO2 1.5% wt, which can improve the thixotropy of the first optical layer 31; the thixotropy of the second optical layer 32 is higher than that of the first optical layer 31; the lower thixotropy of the first optical layer 31 is conducive to the expulsion of air bubbles in the first optical layer 31.

[0063] Example 3

[0064] This embodiment discloses a Mini LED backlight, which consists of a circuit board 1, several chips 2, a first optical layer 31 and a second optical layer 32. Several chips 2, the first optical layer 31 and the second optical layer 32 are fixed on the circuit board 1. The first optical layer 31 covers the entire chip 2, the second optical layer 32 covers the first optical layer 31, a light-transmitting layer 23 is laid on the chip 2, and an emitting layer is laid on the light-transmitting layer 23.

[0065] The first refractive section 34 includes a first starting point 341 and a first ending point 342. The line connecting the first starting point 341 and the first ending point 342 forms a first curved segment, and the angle between the first curved segment and the circuit board 1 is θ1. The second refractive section 35 includes a second starting point 351 and a second ending point 352. The line connecting the second starting point 351 and the second ending point 352 forms a second curved segment. The first ending point 342 coincides with the second starting point 351, and the angle between the second curved segment and the circuit board 1 is θ2. The third refractive section 36 includes a third starting point 361 and a third ending point 362. The third starting point 361... The line connecting point 61 to the third endpoint 362 forms the third curve segment. The second endpoint 352 coincides with the third starting point 361. The third endpoint 362 is the central vertex of the optical layer 3. The angle between the external tangent of the third starting point 361 in the third curve segment and the circuit board 1 is θ3. The first optical layer 31 has θ1 of 28°, θ2 of 50°, and θ3 of 65°. The second optical layer 32 has θ1 of 45°, θ2 of 60°, and θ3 of 70°. The surface of the chip 2 contains a Bragg reflector layer 24, which helps to increase the light emission angle of the chip 2.

[0066] At this time, in the first optical layer 31, the ratio of the distance H from the third end point 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third end point 362 is 0.3, and in the second optical layer 32, the ratio of the distance H from the third end point 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third end point 362 is 0.7.

[0067] The first optical layer 31 is made of silicone rubber, and the second optical layer 32 is made of silicone resin. The filling particle material in the first optical layer 31 is SiO2 0.2% wt, which can improve the thixotropy of the first optical layer 31. The filling particle material in the second optical layer 32 is SiO2 2.0% wt, which can improve the thixotropy of the first optical layer 31. The thixotropy of the second optical layer 32 is higher than that of the first optical layer 31. The lower thixotropy of the first optical layer 31 is conducive to the expulsion of air bubbles in the first optical layer 31.

[0068] Example 4

[0069] This embodiment discloses a Mini LED backlight, which is composed of a circuit board 1, several chips 2, a first optical layer 31, a second optical layer 32 and a third optical layer 33; the several chips 2, the first optical layer 31, the second optical layer 32 and the third optical layer 33 are fixed on the circuit board 1, the first optical layer 31 covers the entire chip 2, the second optical layer 32 covers the first optical layer 31, and the third optical layer 33 covers the second optical layer 32.

[0070] The first refractive section 34 includes a first starting point 341 and a first ending point 342. The line connecting the first starting point 341 and the first ending point 342 forms a first curved segment, and the angle between the first curved segment and the circuit board 1 is θ1. The second refractive section 35 includes a second starting point 351 and a second ending point 352. The line connecting the second starting point 351 and the second ending point 352 forms a second curved segment. The first ending point 342 coincides with the second starting point 351, and the angle between the second curved segment and the circuit board 1 is θ2. The third refractive section 36 includes a third starting point 361 and a third ending point 362. The line connecting the third starting point 361 to the third ending point 362 forms the third curve segment. The second ending point 352 coincides with the third starting point 361. The third ending point 362 is the center vertex of the optical layer 3. The angle between the external tangent of the third starting point 361 in the third curve segment and the circuit board 1 is θ3. The θ1 of the first optical layer 31 is 20°, the θ2 is 51°, and the θ3 is 67°. The θ1 of the second optical layer 32 is 45°, the θ2 is 60°, and the θ3 is 70°. The θ1 of the third optical layer 33 is 55°, the θ2 is 70°, and the θ3 is 82°.

[0071] At this time, in the first optical layer 31, the ratio of the distance H from the third end point 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third end point 362 is 0.3, and in the second optical layer 32, the ratio of the distance H from the third end point 362 to the circuit board 1 to the distance R from the first starting point 341 to the foot of the perpendicular from the third end point 362 is 0.7.

[0072] The first optical layer 31 is made of silicone rubber, the second optical layer 32 is made of silicone resin, and the third optical layer 33 is made of epoxy resin. The filler material in the first optical layer 31 is SiO2 with 0.1% Wt, which can improve the thixotropy of the first optical layer 31. The filler material in the second optical layer 32 is SiO2 with 0.8% Wt, which can improve the thixotropy of the first optical layer 31. The filler material in the second optical layer 32 is SiO2 with 3.0% Wt, which can improve the thixotropy of the first optical layer 31. The thixotropy of the second optical layer 32 is higher than that of the first optical layer 31, and the thixotropy of the third optical layer 33 is higher than that of the second optical layer 32.

[0073] Other aspects of the Mini LED backlight and its backlight module described in this invention are described in the prior art and will not be repeated here.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A Mini LED backlight, characterized in that: The device includes a circuit board, several chips, and an optical layer. The chips and optical layer are fixed above the circuit board, with the optical layer covering the chips. The chips and the optical layer together form an independent light-emitting unit. The optical layer comprises a first optical layer…annth optical layer, stacked sequentially from the inside out. Each of the first…nth optical layers is fixedly connected to the circuit board, and each of the first…nth optical layers contains filling particles. The optical layer has a continuous first refractive section, a second refractive section, and a third refractive section. The first refractive section is located at the connection between the circuit board and the optical layer. The first refractive section includes a first starting point and a first ending point, and the line connecting the first starting point and the first ending point forms a first curved segment. The angle between the first curved segment and the circuit board is θ1. The second refractive section includes a second starting point and a second ending point, and the line connecting the second starting point and the second ending point forms a second…annth optical layer ... The second curve segment has a first endpoint coinciding with the second starting point, and the angle between the second curve segment and the circuit board is θ2. The third refractive part includes a third starting point and a third endpoint. The line connecting the third starting point and the third endpoint forms a third curve segment, and the second endpoint coincides with the third starting point. The third endpoint is the center vertex of the optical layer. The angle between the external tangent of the third starting point in the third curve segment and the circuit board is θ3. The relationship between the angles θ1, θ2, and θ3 is as follows: θ3 > θ2 > θ1. The ratio of the distance H from the third endpoint to the circuit board to the distance R of the perpendicular from the first starting point to the third endpoint is 0.4-1.

0. The particle concentration of the nth optical layer is greater than, but greater than, the particle concentration of the first optical layer. The thixotropy of the nth optical layer is greater than, but greater than, the thixotropy of the first optical layer. The particle concentration determines the thixotropy of the optical layer.

2. The Mini LED backlight according to claim 1, characterized in that: The first and second curve segments are both nearly linear curve segments, and the third curve segment is an arc-shaped curve segment.

3. The Mini LED backlight according to claim 1, characterized in that: The optical layer material is composed of one or more of silicone rubber, silicone resin, and epoxy resin.

4. The Mini LED backlight according to claim 1, characterized in that: The filling particles are semi-transparent.

5. The Mini LED backlight according to claim 1, characterized in that: The chip also includes a connection layer, which is fixedly connected to the circuit board. The chips are arranged in an array on the circuit board. The connection layer includes a positive electrode and a negative electrode, both of which are electrically connected to the circuit board.

6. A Mini LED backlight module, characterized in that, The invention includes a Mini LED backlight source as described in any one of claims 1-5, a cavity surrounding the Mini LED backlight source, and a light-emitting port, wherein the light-emitting port is located at the end of the cavity away from the Mini LED backlight source and covers the cavity.

7. The Mini LED backlight module according to claim 6, characterized in that: The cavity includes a reflective film and a driving component. The reflective film is laid between the gaps of the light-emitting units, and the driving component is electrically connected to the light-emitting units.

8. The Mini LED backlight module according to claim 7, characterized in that: The light outlet is provided with a diffuser plate, a light conversion layer and an optical film stacked sequentially from the inside to the outside.

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