Mini LED backlight structure and backlight module thereof

Abstract

The invention discloses a Mini LED (Light Emitting Diode) backlight structure and a backlight module thereof. The Mini LED backlight structure comprises a backlight plate, a plurality of LED lamp beads and a dimming plate, the backlight plate comprises a printed face and a non-printed face, the LED lamp beads are installed on the non-printed face of the backlight plate, and the dimming plate covers the non-printed face of the backlight plate. The dimming plate comprises a base material and a reflecting layer, and the reflecting layer is located between the backlight plate and the base material. A containing hole is formed in the dimming plate, and the LED lamp bead is contained in the containing hole. And a light condensing body is arranged on the base material of the dimming plate. The backlight module comprises the Mini LED backlight structure and further comprises a base, a light guide plate, a prism plate, a diffusion plate set and a protective rubber frame. The cost can be reduced under the condition that the display effect is guaranteed, meanwhile, the production efficiency is improved, the light utilization rate of the LED lamp beads is improved, and better visual effect compensation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight modules, and in particular to a Mini LED backlight structure and a backlight module thereof. Background Art

[0002] At present, small-pitch light-emitting diode displays (Mini Light-Emitting Diode, referred to as Mini-LED) are favored by the backlight display industry because they can be ultra-thin, multi-partitioned and use small-size chip products. They can be comparable to organic light-emitting diode products (commonly known as OLED) in actual effects, and have more competitive advantages than OLED in terms of material costs.

[0003] The backlight structure (backlight module) of the prior art can be divided into two types according to the light input method: direct type and edge type. Among them, the traditional direct type backlight structure has the following disadvantages:

[0004] The function of the backlight structure is to supply sufficient brightness and evenly distributed light sources so that the liquid crystal display can display images normally. The backlight structure includes a plurality of LED lamp beads that provide light. Relatively speaking, reducing the number of LED lamp beads can reduce costs, but this approach will also reduce the backlight visual effect and the brightness of the product screen. In the prior art, a Chinese invention patent with publication number CN218446295U and the name "Backlight Module" discloses a backlight module that utilizes the setting of a reflector to converge and reflect the light emitted by the LED lamp beads, and utilizes the reflector to form light spots to replace the LED lamp beads. This can ensure the overall backlight visual effect while reducing the number of backlight LEDs, and compensate for the problem of poor visual effects due to excessive LED spacing, thereby reducing costs while ensuring the display effect. However, the number of such reflectors is large and they need to be installed one by one, resulting in low production efficiency.

[0005] In addition, the light emitted by the LED lamp beads is reflected, and only the light directly shining on the reflector can be gathered and reflected. Therefore, the setting of this reflector has a low utilization rate of light and limited visual effect compensation ability.

[0006] To this end, the present invention designs a Mini LED backlight structure and a backlight module thereof to overcome the above-mentioned technical problems. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a Mini LED backlight structure and a backlight module thereof, which can reduce costs while ensuring display effects, while improving production efficiency, increasing the light utilization rate of LED lamp beads, and achieving better visual effect compensation.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A Mini LED backlight structure, comprising: a backlight plate, a plurality of LED lamp beads and a dimming plate, wherein the backlight plate comprises a printed surface and a non-printed surface, the plurality of LED lamp beads are mounted on the non-printed surface of the backlight plate, and the dimming plate is covered on the non-printed surface of the backlight plate;

[0010] The dimming plate includes a substrate and a reflective layer, wherein the reflective layer is located between the backlight plate and the substrate, and is used to reflect light; the dimming plate is provided with receiving holes penetrating the substrate and the reflective layer, the number of the receiving holes corresponds to the number of the LED lamp beads, and the LED lamp beads are accommodated in the receiving holes;

[0011] A light concentrator is disposed on the substrate of the dimming plate. The light concentrator is located near the receiving hole and is used for converging and refracting light.

[0012] In one embodiment, the LED lamp bead includes an LED light-emitting element and a colloid, wherein the LED light-emitting element is arranged on the non-printed surface of the backlight panel, and the pins of the LED light-emitting element pass through the backlight panel and extend to the printed surface to realize that the LED light-emitting element is electrically connected to the circuit on the printed surface; the colloid covers the LED light-emitting element, and the colloid is a light-transmitting structure.

[0013] In one embodiment, the height of the colloid is H1, the thickness of the dimming plate is H2, the height of the light concentrator protruding relative to the substrate is H3, and H1=H2+H3, H2=(0.3-0.7)H1.

[0014] In one of the embodiments, the colloid and the light concentrator are both hemispherical structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same; when the dimming plate is covered on the backlight plate, the height of the light concentrator is the same as the height of the colloid.

[0015] In one embodiment, the colloid and the light concentrator are both quadrangular prism structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same; when the dimming plate is covered on the backlight plate, the height of the light concentrator is the same as the height of the colloid.

[0016] In one embodiment, the substrate is a glass structure or an acrylic structure, and the reflective layer is a silver-plated structure.

[0017] In one embodiment, the plurality of LED lamp beads are evenly divided into a plurality of lamp bead columns, and the distance between two adjacent lamp bead columns is L1;

[0018] On the dimming plate, the accommodating holes and the concentrators form a corresponding plurality of accommodating hole columns and a plurality of concentrator columns, the accommodating hole columns and the concentrator columns are arranged alternately, and the distance between adjacent accommodating hole columns and concentrator columns is L2, L2=1 / 2L1.

[0019] A backlight module, comprising the Mini LED backlight structure according to claims 1 to 8, further comprising: a base, a light guide plate, a prism plate, a diffusion plate group and a protective rubber frame;

[0020] The Mini LED backlight structure is installed in the base, the light guide plate is located above the Mini LED backlight structure, the protective rubber frame cover is arranged on the base, and the prism plate and the diffusion plate assembly are arranged between the protective rubber frame and the light guide plate;

[0021] The diffusion plate set includes an upper diffusion plate and a lower diffusion plate, and the prism plate is clamped between the upper diffusion plate and the lower diffusion plate.

[0022] In summary, the Mini LED backlight structure and backlight module of the present invention can reduce costs while ensuring display effects, while improving production efficiency, increasing the light utilization rate of LED lamp beads, and achieving better visual effect compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0024] Figure 1 It is a structural schematic diagram of the Mini LED backlight structure of the present invention;

[0025] Figure 2 for Figure 1 A partial cross-sectional view of the dimming plate shown;

[0026] Figure 3 for Figure 1 A partial cross-sectional view of the backlight panel and LED lamp beads shown;

[0027] Figure 4 It is a schematic diagram of the partial structure of the backlight panel, LED lamp beads and dimming board;

[0028] Figure 5 It is a schematic diagram of the partial structure of the Mini LED backlight structure of this embodiment after assembly;

[0029] Figure 6 A schematic diagram of a partial structure of a Mini LED backlight structure in another embodiment after assembly;

[0030] Figure 7 It is a schematic diagram of the structural decomposition of the backlight module of the present invention. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings below. People familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover. At the same time, the terms such as "upper", "lower", "left", "right" and "middle" quoted in this specification are also only for the convenience of narration, rather than for limiting the scope of the present invention, and the change or adjustment of their relative relationship. Without substantially changing the technical content, it should also be regarded as the scope that the present invention can implement.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The present invention provides a Mini LED backlight structure 100, such as Figure 1 As shown, it includes: a backlight panel 110, a plurality of LED lamp beads 120 and a dimming panel 130, the backlight panel 110 includes a printed surface 111 and a non-printed surface 112 (such as Figure 3 As shown in FIG. 1 , a plurality of LED lamp beads 120 are mounted on the non-printed surface 112 of the backlight plate 110 , and a dimming plate 130 is covered on the non-printed surface 112 of the backlight plate 110 .

[0034] like Figure 2 As shown, the dimming plate 130 includes a substrate 131 and a reflective layer 132. The reflective layer 132 is located between the backlight plate 110 and the substrate 131. The reflective layer 132 is used to reflect the light emitted by the LED lamp beads 120. The dimming plate 130 is provided with receiving holes 133 that penetrate the substrate 131 and the reflective layer 132. The number of the receiving holes 133 corresponds to the number of the LED lamp beads 120, and the LED lamp beads 120 are received in the receiving holes 133.

[0035] Moreover, if Figure 2 and Figure 4As shown, a light concentrator 134 is also provided on the substrate 131 of the dimming plate 130. The light concentrator 134 is located near the receiving hole 133. The light concentrator 134 is used to converge and refract light. The function of the light concentrator 134 is to utilize the refraction and reflection of light to imitate the light point to replace the LED lamp bead 120. The specific principle will be explained below.

[0036] like Figure 3 As shown, the LED lamp bead 120 includes an LED light-emitting element 121 and a colloid 122. The LED light-emitting element 121 is arranged on the non-printed surface 112 of the backlight plate 110. In addition, the pins (not shown) of the LED light-emitting element 121 pass through the backlight plate 110 and extend to the printed surface 111. A circuit composed of copper wires is printed on the printed surface 111 (i.e., similar to a PCB circuit board). The pins are connected to the corresponding circuit, so that the LED light-emitting element 121 is electrically connected to the circuit on the printed surface 111, which facilitates the subsequent power-on and light-emitting of the LED light-emitting element 121. The colloid 122 covers the LED light-emitting element 121, and the colloid 122 is a light-transmitting structure. The setting of the colloid 122 can limit and protect the LED light-emitting element 121, so that the LED light-emitting element 121 can be stably adhered to the non-printed surface 112 of the backlight plate 110 to prevent the LED light-emitting element 121 from detaching; it can also protect the LED light-emitting element 121 to avoid damage due to pressure, thereby extending the service life.

[0037] Preferably, Figure 2 and Figure 3 As shown, the height of the colloid 122 is H1, the thickness of the dimming plate 130 is H2, the height of the light collector 134 protruding relative to the substrate 131 is H3, and H1=H2+H3. That is, when the dimming plate 130 is covered on the backlight plate 110, the vertex of the colloid 122 and the vertex of the light collector 134 are at the same height. In this way, when the light collector 134 imitates the LED lamp bead 120, it can obtain the lighting effect of the LED lamp bead 120 as much as possible. Furthermore, the thickness of the dimming plate 130 and the height of the colloid 122 satisfy the relationship: H2=(0.3~0.7)H1.

[0038] The working principle of the Mini LED backlight structure 100 of the present invention is as follows:

[0039] During assembly, the dimming plate 130 is covered on the non-printed surface 112 of the backlight plate 110, the LED lamp bead 120 is accommodated in the receiving hole 133, and the upper part of the LED lamp bead 120 is partially exposed from the receiving hole 133, and the concentrator 134 is located near the LED lamp bead 120. The matching relationship between the LED lamp bead 120 and the dimming plate 130 can be referred to Figure 5 As shown;

[0040] When working, the LED lamp bead 120 is powered on and emits light, and the light emitted is radially diffused in all directions, of which part of the light is irradiated upward through the colloid 122, and the other part of the light in the horizontal direction is irradiated in all directions. Since only the light irradiated upward can be used by the backlight module, in the traditional backlight structure, part of the light in the horizontal direction cannot be used well, and the utilization rate of the light is low. In the present invention, this part of the light in the horizontal direction will irradiate and enter the substrate 131 of the dimming plate 130, and then be used;

[0041] Specifically, inside the substrate 131, the light propagates in a straight line and refracts. When the light passes through the condenser 134, the light is refracted and converged, thereby forming a bright spot similar to the LED light-emitting element 121 in the condenser 134. In this way, the condenser 134 can replace the LED lamp beads 120, thereby reducing the number of LED lamp beads 120 while ensuring the display effect, so as to reduce the cost;

[0042] At the same time, inside the substrate 131, after multiple refractions, the light will eventually irradiate the reflective layer 132. The reflective layer 132 reflects the light upward as much as possible, so that the area without the LED lamp beads 120 and the concentrator 134 will also have light irradiated upward. In this way, under the action of the dimming plate 130, most of the light emitted by the LED lamp beads 120 can be irradiated upward, forming effective lighting and improving the utilization rate of light.

[0043] It should be noted that, compared with the prior art, the dimming plate 130 of the present invention is designed with a reflective layer 132 and a concentrator 134 at the same time. The concentrator 134 can use the refraction and reflection of light to form light spots to replace the LED lamp beads 120, thereby ensuring the overall backlight visual effect while reducing the number of LED lamp beads 120, compensating for the problem of poor visual effect due to the large spacing between the LED lamp beads 120, and thus reducing costs while ensuring the display effect. At the same time, the substrate 131 can refract the light that was originally biased to the horizontal direction, and reflect the light upward through the reflective layer 132, that is, utilize the light that was originally biased to the horizontal direction. In this way, the brightness of the area where there were no LED lamp beads 120 and the concentrator 134 can be improved, so that the Mini LED backlight structure 100 can achieve surface lighting.

[0044] It is worth noting that the design of the dimming plate 130 is not obvious, and it has been considered in the following aspects:

[0045] First, the thickness H2 of the dimming plate 130 is smaller than the height H1 of the colloid 122. When the dimming plate 130 is covered on the backlight plate 110, part of the upper part of the LED lamp bead 120 will be exposed from the accommodating hole 133. The reason for this design is to avoid affecting the light irradiated upward by the LED lamp bead 120. If the dimming plate 130 completely shields the LED lamp bead 120, the light irradiated upward by the LED lamp bead 120 will be refracted when passing through the substrate 131, affecting the light path. At the same time, since the light passes through the substrate 131, its brightness will inevitably be reduced. Of course, the thickness of the dimming plate 130 is not good either. When H2 is too small, it means that only the light closer to the horizontal direction can be used by the dimming plate 130, which will reduce the utilization rate of the light by the dimming plate 130. Therefore, in the present invention, the thickness of the dimming plate 130 and the height of the colloid 122 satisfy the relationship: H2 = (0.3~0.7) H1;

[0046] Secondly, the reflective layer 132 is arranged on the dimming plate 130, rather than on the non-printed surface 112 of the backlight plate 110. In the prior art, there is a technical solution for setting the reflective layer 132 on the non-printed surface 112, such as the invention patent with application number 202110457416.6 and the name “A Mini LED Backlight Module”. However, in the actual production process, since the LED light-emitting elements 121 and the adhesive colloid 122 need to be welded on the backlight plate 110, the corresponding circuit needs to be printed on its printed surface 111, which makes it difficult to process the reflective layer 132 on the non-printed surface 112 and the process is more complicated. The present invention sets the reflective layer 132 on the dimming plate 130, which not only reduces the processing difficulty, but also makes full use of the light that was originally not used through the refraction of the substrate 131, thereby improving the reflection effect;

[0047] Furthermore, the light concentrator 134 on the dimming plate 130 is integrally formed with the substrate 131 , so that there is no need to install a plurality of light concentrators 134 one by one, thereby improving production and processing efficiency.

[0048] Preferably, the substrate 131 is a glass structure, and the reflective layer 132 is a silver-plated structure. In this way, the overall structure of the dimming plate 130 is similar to that of a mirror in the prior art, and the preparation of the reflective layer 132 can refer to the production and manufacturing of existing mirrors. Of course, the substrate 131 can also be an acrylic structure, which also has the function of transmitting and refracting light.

[0049] In this embodiment, if Figure 4 and Figure 5 As shown, both the colloid 122 and the light concentrator 134 are hemispherical structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same. When the dimming plate 130 is covered on the backlight plate 110 , the height of the light concentrator 134 is the same as the height of the colloid 122 .

[0050] In another embodiment, Figure 6 As shown, the colloid 122 and the light concentrator 134 can be quadrangular prism structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same. Similarly, when the dimming plate 130 is covered on the backlight plate 110 , the height of the light concentrator 134 is the same as that of the colloid 122 .

[0051] In this embodiment, if Figure 1 As shown, a plurality of LED lamp beads 120 are evenly divided into a plurality of groups of lamp bead columns, and the distance between two adjacent lamp bead columns is L1. In addition, on the dimming plate 130, the accommodating holes 133 and the concentrators 134 form a plurality of corresponding groups of accommodating hole columns and a plurality of groups of concentrator columns, and the accommodating hole columns and the concentrator columns are arranged alternately, and the distance between adjacent accommodating hole columns and concentrator columns is L2, L2=1 / 2L1. In this way, when the dimming plate 130 is covered on the backlight plate 110, the lamp bead columns are convenient for alternating the concentrator columns, that is, each group of concentrator columns is located on the symmetry axis between the two groups of lamp bead columns, and the concentrator 134 can utilize the light of the LED lamp beads 120 on both sides. In other embodiments, the distribution of the LED lamp beads 120, the accommodating holes 133 and the concentrators 134 can also be adjusted according to actual needs.

[0052] The present invention further provides a backlight module 10, which includes the Mini LED backlight structure 100. Figure 7 As shown, it also includes: a base 200, a light guide plate 300, a prism plate 400, a diffusion plate group 500 and a protective rubber frame 600. Among them, the Mini LED backlight structure 100 is installed in the base 200, the light guide plate 300 is located above the Mini LED backlight structure 100, and the protective rubber frame 600 is covered on the base 200. The prism plate 400 and the diffusion plate group 500 are arranged between the protective rubber frame 600 and the light guide plate 300. And, as shown in FIG. Figure 7 As shown, the diffusion plate set 500 includes an upper diffusion plate 510 and a lower diffusion plate 520 , and the prism plate 400 is clamped between the upper diffusion plate 510 and the lower diffusion plate 520 .

[0053] When working, the Mini LED backlight structure 100 is powered on to emit light and the light is irradiated to the light guide plate 300. Under the action of the light guide plate 300, the light will be refracted and irradiated upward more vertically. After going up from the light guide plate 300, the light passes through the lower diffuser plate 520, the prism plate 400 and the upper diffuser plate 510 in sequence. The main surface of the lower diffuser plate 520 and the upper diffuser plate 510 has a plurality of particles. The arc surfaces of the large and small particles allow the light to have a larger diffusion angle, thereby eliminating Newton's rings as much as possible, reducing optical interference fringes, and making the light output more uniform. The main functions of the prism plate 400 include improving the utilization rate of light and converting line light sources into surface light sources, so that the light propagates toward the front of the screen, and can widen the screen viewing angle and balance the light source intensity.

[0054] In summary, the Mini LED backlight structure 100 and the backlight module 10 thereof of the present invention can reduce costs while ensuring display effects, while improving production efficiency, increasing the light utilization rate of the LED lamp beads 120, and achieving better visual effect compensation.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A Mini LED backlight structure, characterized in that: include: A backlight panel, a plurality of LED lamp beads and a dimming panel, wherein the backlight panel comprises a printed surface and a non-printed surface, the plurality of LED lamp beads are mounted on the non-printed surface of the backlight panel, and the dimming panel cover is arranged on the non-printed surface of the backlight panel; The dimming plate includes a substrate and a reflective layer, wherein the reflective layer is located between the backlight plate and the substrate, and is used to reflect light; the dimming plate is provided with receiving holes penetrating the substrate and the reflective layer, the number of the receiving holes corresponds to the number of the LED lamp beads, and the LED lamp beads are accommodated in the receiving holes; A light concentrator is disposed on the substrate of the dimming plate. The light concentrator is located near the receiving hole and is used for converging and refracting light.

2. The Mini LED backlight structure according to claim 1, characterized in that: The LED lamp bead includes an LED light-emitting element and a colloid. The LED light-emitting element is arranged on the non-printed surface of the backlight plate. The pins of the LED light-emitting element pass through the backlight plate and extend to the printed surface so that the LED light-emitting element is electrically connected to the circuit on the printed surface; the colloid covers the LED light-emitting element, and the colloid is a light-transmitting structure.

3. The Mini LED backlight structure according to claim 2, characterized in that: The height of the colloid is H1, the thickness of the dimming plate is H2, the height of the light concentrator protruding relative to the substrate is H3, and H1=H2+H3, H2=(0.3-0.7)H1.

4. The Mini LED backlight structure according to claim 3, characterized in that: The colloid and the light concentrator are both hemispherical structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same; when the dimming plate is covered on the backlight plate, the height of the light concentrator is the same as the height of the colloid.

5. The Mini LED backlight structure according to claim 3, characterized in that: The colloid and the light concentrator are both quadrangular prism structures, and the cross-sectional dimensions of the two on the same horizontal plane are the same; when the dimming plate is covered on the backlight plate, the height of the light concentrator is the same as the height of the colloid.

6. The Mini LED backlight structure according to claim 1, characterized in that: The substrate is a glass structure or an acrylic structure, and the reflective layer is a silver-plated structure.

7. The Mini LED backlight structure according to claim 1, characterized in that: The plurality of LED lamp beads are evenly divided into a plurality of lamp bead vertical columns, and the distance between two adjacent lamp bead vertical columns is L1; On the dimming plate, the accommodating holes and the concentrators form a corresponding plurality of accommodating hole columns and a plurality of concentrator columns, the accommodating hole columns and the concentrator columns are arranged alternately, and the distance between adjacent accommodating hole columns and concentrator columns is L2, L2=1 / 2L1.

8. A backlight module, characterized in that: The Mini LED backlight structure includes the Mini LED backlight structure described in claims 1 to 8 above, and further includes: a base, a light guide plate, a prism plate, a diffusion plate group and a protective rubber frame; The Mini LED backlight structure is installed in the base, the light guide plate is located above the Mini LED backlight structure, the protective rubber frame cover is arranged on the base, and the prism plate and the diffusion plate assembly are arranged between the protective rubber frame and the light guide plate; The diffusion plate set includes an upper diffusion plate and a lower diffusion plate, and the prism plate is clamped between the upper diffusion plate and the lower diffusion plate.

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