A mini LED backlight source

Abstract

The present application belongs to the field of backlight sources, and in particular, relates to a mini LED backlight source, which includes a main substrate and a sub-substrate, wherein the main substrate includes a plurality of parallel main substrate teeth, the sub-substrate includes a plurality of parallel sub-substrate teeth, the main substrate also includes a base, the main substrate teeth are fixedly connected to one side of the base, the sub-substrate teeth are slidably connected between adjacent main substrate teeth, and at least one row of light-emitting chips are electrically connected to each of the main substrate teeth and each of the sub-substrate teeth. The present application has the effect of ensuring the utilization rate of the light-emitting chips while switching the light effect.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a mini LED backlight source. Background Art

[0002] The backlight source is a component used to provide light source for the backlight module, and is usually composed of a substrate, a light-emitting chip and a driving circuit arranged on the substrate.

[0003] In the prior art, since the backlight source is a light-emitting chip arrayed on the entire substrate, the switching of light effects is achieved by controlling the light emission of different LEDs, that is, it is necessary to preset a variety of different light source chips to cope with different application scenarios. In different application scenarios, only some of the light source chips work and emit light.

[0004] Therefore, the utilization rate of light source chips in the backlight source is low, and the number of light-emitting chips assembled in the backlight source during the production process is greater than the number of light-emitting chips actually working in each application scenario, which causes a waste of light source chips. There is an urgent need for a backlight source that enables the same light source chip to function in a variety of different light effect environments to reduce the waste caused by excess light source chips. Summary of the invention

[0005] In order to solve the above problems and enable the light source chip to work in various usage scenarios of the backlight source, the present application provides a mini LED backlight source.

[0006] The mini LED backlight provided in this application adopts the following technical solution:

[0007] A mini LED backlight source includes a main substrate and a sub-substrate, wherein the main substrate includes a plurality of main substrate teeth arranged in parallel, the sub-substrate includes a plurality of sub-substrate teeth arranged in parallel, the main substrate also includes a base, the main substrate teeth are fixedly connected to one side of the base, the sub-substrate teeth are slidably connected between adjacent main substrate teeth, at least one column of light-emitting chips is electrically connected to each of the main substrate teeth and each of the sub-substrate teeth, and the sub-substrate teeth can move relative to the main substrate teeth, so as to arrange the light-emitting chips on the main substrate teeth and the light-emitting chips on the sub-substrate teeth in different combinations.

[0008] By adopting the above technical solution, when the secondary substrate moves horizontally relative to the main substrate, the light-emitting chips on the teeth of the main substrate and the light-emitting chips on the teeth of the secondary substrate are arranged in different combinations, thereby achieving different light effects. Under different light effects, all light-emitting chips can work and emit light, without the need to switch the light source chips on and off to achieve the switching of light effects. The number of light source chips assembled during production is the same as the number of light source chips actually working in each scene, thereby reducing the waste caused by excess light source chips.

[0009] Optionally, there are two auxiliary base plates, and a pair of auxiliary base plate teeth are sandwiched between two adjacent main base plate teeth, and the pair of auxiliary base plate teeth belong to the two auxiliary base plates respectively.

[0010] By adopting the above technical solution, the light-emitting chips are divided into three groups, and more combinations can be achieved when the auxiliary substrate slides relative to the main substrate.

[0011] Optionally, the light emitting chip includes three types: a red light chip, a green light chip and a blue light chip.

[0012] By adopting the above technical solution, the red light chip, green light chip and blue light chip can be combined into a monochrome light band, and can also be mixed into white light to adapt to more usage scenarios.

[0013] Optionally, on all the main substrate teeth or the auxiliary substrate teeth, the red light chip, the green light chip and the blue light chip are cyclically arranged in a fixed order.

[0014] By adopting the above technical solution, the light-emitting chips of the main substrate teeth and the auxiliary substrate teeth can be combined into circulating light bands after being aligned according to color. On this basis, by sliding the two auxiliary substrates outward by the distance of one light-emitting chip, the conversion from monochromatic light to white light can be achieved.

[0015] Optionally, a reflector is also included, and the main substrate teeth and the auxiliary substrate teeth are arranged alternately in a one-to-one correspondence, and the reflector is arranged in a one-to-one correspondence with the light-emitting chip. The reflector is arranged on the side of the main substrate tooth away from the corresponding auxiliary substrate tooth, and is used to reflect the light emitted by the light-emitting chip in the direction of the corresponding auxiliary substrate tooth. Alternatively, the reflector is arranged on the side of the auxiliary substrate tooth away from the corresponding main substrate tooth, and is used to reflect the light emitted by the light-emitting chip in the direction of the corresponding main substrate tooth.

[0016] By adopting the above technical solution, when the light-emitting chip of the main substrate teeth is arranged opposite to the light-emitting chip of the auxiliary substrate teeth, the light-emitting chips facing each other are surrounded by two reflectors, and the light is converged, which appears as a point light source array on a macro scale. When the main substrate teeth are staggered with the auxiliary substrate teeth, the convergence effect of the reflector decreases until it appears as a surface light source on a macro scale.

[0017] Optionally, on the same main base plate tooth or the auxiliary base plate tooth, a light homogenizer is provided between adjacent reflectors.

[0018] By adopting the above technical solution, the light not converged by the reflector will be evenly diverged. For the case of a point light source array, the leaked light can be weakened into a uniform backlight. For the case of a surface light source, the granularity of the entire surface light source can be reduced.

[0019] Optionally, the distance between adjacent light-emitting chips on the same main substrate tooth or auxiliary substrate tooth is greater than the minimum resolvable distance, and the width of the main substrate tooth and the auxiliary substrate tooth is less than the minimum resolvable distance.

[0020] By adopting the above technical solution, since light mixing will only occur when and only when the distance between the two light sources is less than the minimum resolvable distance, there will be no light mixing between the light-emitting chips on the same main substrate tooth or the adjacent light-emitting chips on the same sub-substrate tooth. The light mixing effect is only controlled by the relative movement of the sub-substrate and the main substrate, and the light effect presented by the backlight source is more accurate and controllable.

[0021] Optionally, permanent magnet particles are provided at positions where the main substrate teeth are close to the auxiliary substrate teeth, and at positions where the auxiliary substrate teeth are close to the main substrate teeth. The permanent magnet particles on the main substrate teeth and the auxiliary substrate teeth interact with each other to position the main substrate and the auxiliary substrate.

[0022] By adopting the above technical solution, the permanent magnet particles assist in positioning the main substrate and the negative substrate, making the control of the light effect more accurate.

[0023] Optionally, for any pair of relative main substrate teeth and auxiliary substrate teeth, the permanent magnet particles arranged on one side have the same polarity, and the polarities on both sides are the same, which is used to push the main substrate and the auxiliary substrate away from a non-predetermined matching position, or the polarities on both sides are opposite, which is used to adsorb and position the main substrate and the auxiliary substrate at a predetermined position.

[0024] By adopting the above technical solution, permanent magnet particles with the same polarity can push the main substrate and the auxiliary substrate away from the non-predetermined matching position, and permanent magnet particles with opposite polarity can adsorb the main substrate and the auxiliary substrate to the predetermined position.

[0025] Optionally, on the same main substrate tooth or auxiliary substrate tooth, the polarity of the permanent magnet particles is alternating between S poles and N poles, which is used to adsorb and position the main substrate and the auxiliary substrate at a predetermined position, and push the main substrate and the auxiliary substrate away from a non-predetermined matching position.

[0026] By adopting the above technical solution, the alternately arranged N poles and S poles have both the effects of repulsion and adsorption, making the positioning of the main substrate and the auxiliary substrate more precise, especially optimizing the use feel, making the sliding fit between the main substrate and the auxiliary substrate feel smoother and the sense of segmentation clearer.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The light effect is adjusted by changing the coordination between the light-emitting chip and the optical element through the relative sliding of the main substrate and the auxiliary substrate. The adjustment of the light effect no longer depends on the on and off of different groups of light source chips. The same light source chip can work in different application scenarios. Under different light effects, all light-emitting chips can work. The utilization rate of the light-emitting chip is maintained at the designed maximum value, avoiding the waste caused by excess light source chips.

[0029] 2. The setting of RGB three-color light-emitting chips can not only achieve light bands of different colors by cooperating with each other in the same color, but also achieve the effect of pure white light by mixing different colors. Moreover, the switching between the two modes only requires moving the auxiliary substrate relative to the main substrate.

[0030] 3. The setting of reflectors and light diffusers enables the backlight source to be divided into point light source array mode and surface light source mode to adapt to different scene needs;

[0031] 4. The auxiliary positioning of permanent magnet particles can make the switching between the main substrate and the auxiliary substrate smoother, with a better feel and more accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the mini LED backlight source in the three-color light mode of Example 1 of the present application;

[0033] Figure 2 This is a schematic diagram of the structure of the main substrate of Example 1 of the present application;

[0034] Figure 3 It is a schematic diagram of the structure of the mini LED backlight source in the white light mode of Example 1 of the present application;

[0035] Figure 4 It is a schematic diagram of the structure of the mini LED backlight source in the dot matrix light mode of Example 2 of the present application;

[0036] Figure 5 is a top view of the mini LED backlight source in the dot matrix light mode of Example 2 of the present application;

[0037] Figure 6 It is a schematic diagram of the structure of the mini LED backlight source in the surface light source mode of Example 2 of the present application;

[0038] Figure 7 This is a top view of the mini LED backlight source of Example 2 of the present application in the surface light source mode.

[0039] Description of reference numerals:

[0040] 1. Main substrate; 11. Main substrate teeth; 12. Base; 2. Sub-substrate; 21. Sub-substrate teeth; 3. Light-emitting chip; 4. Permanent magnet particles; 51. Reflector; 52. Light homogenizer. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-7 This application is described in further detail.

[0042] The embodiment of the present application discloses a mini LED backlight source.

[0043] Example 1

[0044] Reference Figure 1 The mini LED backlight source includes a main substrate 1, a sub-substrate 2 and a light-emitting chip 3. The main substrate 1 and the sub-substrate 2 slide together to form a complete substrate. The light-emitting chip 3 is arranged in an array on the substrate and is electrically connected to the main substrate 1 or the sub-substrate 2. When the sub-substrate 2 slides relative to the main substrate 1, the light-emitting chip 3 on the sub-substrate 2 cooperates with different light-emitting chips 3 on the host to produce different light effects.

[0045] Specifically, refer to Figure 2 The main substrate 1 includes a base 12 and main substrate teeth 11. The base 12 is a thin plate etched with a circuit, and its size is the same as or slightly larger than the above-mentioned complete substrate. The main substrate teeth 11 are arranged on one side of the base 12 where the circuit is etched. Multiple main substrate teeth 11 are distributed in parallel, and the distance between any adjacent main substrate teeth 11 remains the same. The main substrate teeth 11 are connected to the circuit on the base 12.

[0046] refer to Figure 1 , Figure 3 There are two sub-base boards 2, each of which includes a plurality of sub-base board teeth 21, and the sub-base board teeth 21 are arranged one by one corresponding to the main base board teeth 11. The sub-base board teeth 21 of the two sub-base boards 2 are respectively inserted into the gap between the main base board teeth 11 from both ends of the main base board teeth 11. On any cross section perpendicular to the direction of the main base board teeth 11, the main base board teeth 11, the sub-base board teeth 21 of the first sub-base board 2, and the sub-base board teeth 21 of the second sub-base board 2 are arranged in a cycle.

[0047] On each main substrate tooth 11, a plurality of light-emitting chips 3 are evenly distributed along its length direction. The light-emitting chips 3 include three types: red light chip, green light chip and blue light chip, and the three light-emitting chips 3 are arranged in a cycle in a fixed order. The distance between two adjacent light-emitting chips 3 is greater than the minimum resolvable distance of the backlight source, and the width of the main substrate teeth and the auxiliary substrate teeth is less than the minimum resolvable distance.

[0048] It should be noted that the minimum resolvable distance has different definitions in different fields. The minimum resolvable distance in this application refers to the minimum distance between two adjacent light sources without light mixing.

[0049] On each secondary substrate tooth 21 , a plurality of light emitting chips 3 are evenly distributed along its length direction. The light emitting chips 3 include red light chips, green light chips and blue light chips. The ratio and arrangement order of the three light emitting chips 3 are the same as those of the main substrate teeth 11 .

[0050] The widths of the main substrate teeth 11 and the auxiliary substrate teeth 21 are both smaller than the minimum resolvable distance of the backlight source to ensure that the light emitting chips 3 on adjacent main substrate teeth 11 and auxiliary substrate teeth 21, as well as the light emitting chips 3 on two adjacent auxiliary substrate teeth 21 can mix light with each other.

[0051] Permanent magnet particles 4 are provided on the surfaces of one or more pairs of mutually fitted main substrate teeth 11 and auxiliary substrate teeth 21, which are used to position the main substrate 1 and the negative substrate. The polarity of the permanent magnet particles 4 is that the N pole and the S pole are arranged alternately, and the length occupied by adjacent N poles and S poles is the length of a single light-emitting chip 3 plus the length of the gap between adjacent light-emitting chips 3. In other words, on the same main substrate tooth 11, the permanent magnet particles 4 of the same polarity are opposite to the light-emitting chip 3, and the permanent magnet particles 4 of another polarity are provided in the gap between the light-emitting chips 3; on the auxiliary substrate teeth 21 corresponding to the main substrate teeth 11, the polarity of the permanent magnet particles 4 is opposite to that of the permanent magnet particles 4 of the main substrate teeth 11, that is, when the light-emitting chip 3 of the auxiliary substrate teeth 21 is directly opposite to the light-emitting chip 3 of the main substrate teeth 11, the relative permanent magnet particles 4 are attracted to each other.

[0052] The implementation principle of Example 1 is:

[0053] The backlight source of this embodiment has two modes: white light and three-color light.

[0054] Three color light mode:

[0055] refer to Figure 1 When the two sub-substrates 2 slide to the deepest part of the main substrate teeth 11, at this time, on any cross section perpendicular to the main substrate teeth 11, all the light-emitting chips 3 intercepted have the same color. When the interface moves along the direction of the main substrate teeth 11, the color of the light-emitting chip 3 changes accordingly.

[0056] Because the spacing between adjacent light-emitting chips 3 on the same main substrate tooth 11 or auxiliary substrate tooth 21 is greater than the minimum resolvable distance, adjacent heterochromatic light sources on the same main substrate tooth 11 or auxiliary substrate tooth 21 will not mix light, and the width of the main substrate tooth 11 and the auxiliary substrate tooth 21 is less than the minimum resolvable distance, so mixing light occurs between adjacent same-color light-emitting chips 3 on the above cross section. Macroscopically, it is manifested as a series of monochromatic light strips perpendicular to the direction of the main substrate tooth 11, and the colors of the light strips cycle through red, green and blue.

[0057] White light mode:

[0058] refer to Figure 3, the two sub-substrates 2 slide out a distance of a light-emitting chip 3 in their respective directions, so that the light-emitting chip 3 of the main substrate tooth 11 is directly opposite to the new light-emitting chip 3. At this time, on any cross section perpendicular to the main substrate tooth 11, any three adjacent light-emitting chips 3 include three types of red light chips, green light chips and blue light chips.

[0059] Similarly, because the spacing between adjacent light-emitting chips 3 on the same main substrate tooth 11 or auxiliary substrate tooth 21 is greater than the minimum resolvable distance, adjacent heterochromatic light sources on the same main substrate tooth 11 or auxiliary substrate tooth 21 will not mix light, and the width of the main substrate tooth 11 and the auxiliary substrate tooth 21 is less than the minimum resolvable distance, so mixing light occurs between adjacent heterochromatic light-emitting chips 3 on the above cross section. Macroscopically, it appears as white light strips perpendicular to the direction of the main substrate tooth 11.

[0060] In the above-mentioned switching process, when the main substrate 1 and the auxiliary substrate 2 reach the predetermined position so that the light-emitting chip 3 is facing each other, the permanent magnet particles 4 with different names are attracted to each other to play a positioning role, while in the non-predetermined position, the permanent magnet particles 4 with the same name are facing each other, so the main substrate 1 and the auxiliary substrate 2 tend to return to the predetermined position driven by the repulsive force and the adsorption force.

[0061] In another implementation scheme of the present embodiment, the permanent magnet particles 4 arranged on the main substrate teeth 11 and the corresponding permanent magnet particles 4 arranged on the sub-substrate teeth 21 have the same polarity, wherein the permanent magnet particles 4 on one side are arranged close to the light-emitting chip 3, and the permanent magnet particles 4 on the other side are arranged in the gap between two adjacent light-emitting chips 3. When the light-emitting chips 3 on both sides are not directly facing each other, due to the repulsive force of the permanent magnet particles 4 of the same name, the main substrate 1 and the sub-substrate 2 tend to move relative to each other so that the light-emitting chips 3 are directly facing each other.

[0062] In another implementation scheme of the present embodiment, the permanent magnet particles 4 arranged on the main substrate teeth 11 and the corresponding permanent magnet particles 4 arranged on the sub-substrate teeth 21 are both arranged close to the light-emitting chip 3, and the relative permanent magnet particles 4 have opposite polarities. When the light-emitting chips 3 on both sides are not facing each other, under the attraction of the permanent magnet particles 4 of opposite names, the main substrate 1 and the sub-substrate 2 have a tendency to move relative to each other so that the light-emitting chips 3 face each other.

[0063] Example 2

[0064] Reference Figure 4 , Figure 5 The mini LED backlight source includes a main substrate 1, a sub-substrate 2 and a light-emitting chip 3. The main substrate 1 and the sub-substrate 2 slide together to form a complete substrate. The light-emitting chip 3 is arranged in an array on the substrate and is electrically connected to the main substrate 1 or the sub-substrate 2. When the sub-substrate 2 slides relative to the main substrate 1, the light-emitting chip 3 on the sub-substrate 2 cooperates with different light-emitting chips 3 on the host to produce different light effects.

[0065] Specifically, the main substrate 1 includes a base 12 and main substrate teeth 11. The base 12 is a thin plate etched with a circuit, and its size is the same as or slightly larger than the above-mentioned complete substrate. The main substrate teeth 11 are arranged on one side of the base 12 where the circuit is etched. Multiple main substrate teeth 11 are distributed in parallel, and the distance between any adjacent main substrate teeth 11 remains the same. The main substrate teeth 11 are conductive to the circuit on the base 12.

[0066] The auxiliary substrate 2 includes a plurality of auxiliary substrate teeth 21 , and the auxiliary substrate teeth 21 are alternately arranged in a one-to-one correspondence with the main substrate teeth 11 .

[0067] A plurality of evenly distributed light emitting chips 3 are provided on the main substrate teeth 11 and the auxiliary substrate teeth 21 along their respective length directions. The light emitting chips 3 are one or more of monochrome LED or LD chips, and the spacing between adjacent light emitting chips 3 is the same on the main substrate teeth 11 and the auxiliary substrate teeth 21 .

[0068] For any pair of main substrate teeth 11 and auxiliary substrate teeth 21, a reflector 51 is provided on the side of the light-emitting chip 3 of the main substrate tooth 11 away from its corresponding auxiliary substrate tooth 21, and a light homogenizer 52 is provided between adjacent reflectors 51 of the same main substrate tooth 11; a reflector 51 is provided on the side of the light-emitting chip 3 of the auxiliary substrate tooth 21 away from its corresponding main substrate tooth 11, and a light homogenizer 52 is provided between adjacent reflectors 51 of the same auxiliary substrate tooth 21.

[0069] Optionally, permanent magnet particles 4 are provided on the surfaces of one or more pairs of mutually fitted main substrate teeth 11 and auxiliary substrate teeth 21, for positioning the main substrate 1 and the negative substrate, the polarity of the permanent magnet particles 4 is that the N pole and the S pole are arranged alternately, and the length occupied by adjacent N poles and S poles is half the length of a single light-emitting chip 3 plus the length of the gap between adjacent light-emitting chips 3. In other words, on the same main substrate tooth 11, the position opposite to the light-emitting chip 3 and the middle of the gap between two adjacent light-emitting chips 3 are permanent magnet particles 4 of the same polarity, and permanent magnet particles 4 of another polarity are provided in other gaps between the light-emitting chips 3; on the auxiliary substrate teeth 21 corresponding to the main substrate teeth 11, the polarity of the permanent magnet particles 4 is opposite to that of the permanent magnet particles 4 of the main substrate teeth 11, that is, when the light-emitting chip 3 of the auxiliary substrate teeth 21 is opposite to the light-emitting chip 3 of the main substrate teeth 11, or when the light-emitting chip 3 of the auxiliary substrate teeth 21 is opposite to the middle of the gap between the light-emitting chip 3 of the main substrate teeth 11, the relative permanent magnet particles 4 are attracted to each other.

[0070] The implementation principle of Example 2 is:

[0071] The backlight source of this embodiment has two modes: point light array and surface light source.

[0072] Dot Matrix Mode:

[0073] refer to Figure 4 , Figure 5 When the secondary substrate 2 slides to the deepest part of the main substrate tooth 11, the light-emitting chip 3 of the main substrate tooth 11 is directly opposite to the light-emitting chip 3 of the secondary substrate tooth 21. The light emitted by the pairs of light-emitting chips 3 is mixed and converged by the reflector 51. A small amount of light that is not converged is dispersed by the light-homogenizing sheet 52 into a uniform low-brightness backlight. The backlight source is macroscopically manifested as an array distribution of multiple point light sources.

[0074] Area light source mode:

[0075] refer to Figure 6 , Figure 7 , the sub-substrate 2 slides outward by half the distance of the light-emitting chip 3, so that the permanent magnet particles 4 reach the new adsorption position. In this state, the distribution of the light-emitting chips 3 is more dispersed than that of the point light array mode. Moreover, because the reflectors 51 are not arranged relatively, the light emitted by the light-emitting chip 3 is reflected by the reflector 51 only on one side, and is dispersed by the light-homogenizing sheet 52 on the other side, and will not have a converging effect. The backlight source is macroscopically manifested as a surface light source with uniform light emission and small granularity.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mini LED backlight source, characterized in that: The invention comprises a main substrate (1) and a sub-substrate (2), wherein the main substrate (1) comprises a base and a plurality of main substrate teeth (11) arranged in parallel on the base, and the sub-substrate (2) comprises a plurality of sub-substrate teeth (21) arranged in parallel, wherein the sub-substrate teeth (21) are arranged to bear against the main substrate teeth (11), and the sub-substrate teeth (21) are arranged between adjacent main substrate teeth (11), and each of the main substrate teeth (11) and each of the sub-substrate teeth (21) are respectively electrically connected to at least one row of light-emitting chips ( 3), and the auxiliary substrate teeth (21) can move relative to the main substrate teeth (11), so as to arrange the light-emitting chips (3) on the main substrate teeth (11) and the light-emitting chips (3) on the auxiliary substrate teeth (21) in different combinations; and further comprising a reflector (51), wherein the main substrate teeth (11) and the auxiliary substrate teeth (21) are arranged alternately in a one-to-one correspondence, and the reflector (51) and the light-emitting chips (3) are arranged in a one-to-one correspondence, and the reflector (51) is arranged on the main substrate teeth (11). ) is disposed on a side of the secondary substrate tooth (21) away from the side of the secondary substrate tooth (21) corresponding to it, and is used to reflect light emitted by the light-emitting chip (3) in the direction of the secondary substrate tooth (21) corresponding to it, or the reflector (51) is disposed on a side of the secondary substrate tooth (21) away from the side of the primary substrate tooth (11) corresponding to it, and is used to reflect light emitted by the light-emitting chip (3) in the direction of the primary substrate tooth (11) corresponding to it, and a light homogenizing sheet (52) is disposed between adjacent reflectors (51); ... Permanent magnet particles (4) are provided at the positions of the auxiliary substrate teeth (21) and at the positions of the auxiliary substrate teeth (21) close to the main substrate teeth (11); the permanent magnet particles (4) on the main substrate teeth (11) and the auxiliary substrate teeth (21) interact with each other, and are used to push the main substrate (1) and the auxiliary substrate (2) away from a non-predetermined matching position when the polarities of the two sides are the same, or to adsorb and position the main substrate (1) and the auxiliary substrate (2) in a point light array mode or a surface light source mode when the polarities of the two sides are opposite.

2. The mini LED backlight source according to claim 1, characterized in that: There are two auxiliary base plates (2), and a pair of auxiliary base plate teeth (21) is sandwiched between two adjacent main base plate teeth (11), and the pair of auxiliary base plate teeth (21) respectively belong to the two auxiliary base plates (2).

3. The mini LED backlight source according to claim 2, characterized in that: The light emitting chips (3) include three types: a red light chip, a green light chip and a blue light chip.

4. The mini LED backlight source according to claim 3, characterized in that: On all the main substrate teeth (11) or the auxiliary substrate teeth (21), the red light chip, the green light chip and the blue light chip are cyclically arranged in a fixed order.

5. The mini LED backlight source according to claim 1, characterized in that: The spacing between adjacent light-emitting chips (3) located on the same main substrate tooth (11) or auxiliary substrate tooth (21) is greater than the minimum distinguishable distance, and the width of the main substrate tooth (11) and the auxiliary substrate tooth (21) is less than the minimum distinguishable distance.

6. The mini LED backlight source according to claim 1, characterized in that: For any pair of the main base plate teeth (11) and the auxiliary base plate teeth (21) that are opposite to each other, the permanent magnet particles (4) arranged on one side thereof have the same polarity.

7. The mini LED backlight source according to claim 1, characterized in that: On the same main substrate tooth (11) or auxiliary substrate tooth (21), the polarity of the permanent magnet particles (4) is an alternating arrangement of S poles and N poles, and is used to adsorb and position the main substrate (1) and the auxiliary substrate (2) at a predetermined position, and to push the main substrate (1) and the auxiliary substrate (2) away from a non-predetermined matching position.

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