CN115327818A - A kind of backlight module, preparation method of backlight module and display device - Google Patents

Abstract

The invention discloses a backlight module, a preparation method of the backlight module and a display device. The backlight module comprises: the light emitting device comprises a substrate, a plurality of light emitting units and a plurality of condensing lenses; the plurality of light emitting units are densely arranged on the substrate in an array form, and the light emitting units comprise: the LED lamp comprises red LED lamp beads, green LED lamp beads and blue LED lamp beads; the plurality of condensing lenses are arranged in an array manner and correspond to the light-emitting units one by one, and the condensing lenses are arranged on one side of the light-emitting units far away from the substrate; the condensing lens is used for mixing and converging light rays emitted by the red LED lamp beads, the green LED lamp beads and the blue LED lamp beads to form white light. According to the technical scheme of the embodiment of the invention, the area of the light-emitting units for mixing light is reduced, the number of the light-emitting units arranged on the backlight substrate in unit area is increased, and the influence on the display effect of the whole display panel is smaller when one lamp bead in the light-emitting units is damaged.

Description

A kind of backlight module, preparation method of backlight module and display device

technical field

The embodiments of the present invention relate to the field of display technology, and in particular to a backlight module, a method for preparing the backlight module, and a display device.

Background technique

The liquid crystal display panel cannot actively emit light, and needs a backlight source to realize the display. Traditional liquid crystal display panels usually use a front backlight, which can only keep the entire surface on or the entire surface off. The backlight of the Mini LED display panel is composed of multiple lamp beads, which can independently control the lighting of each lamp bead, which is conducive to finely adjusting the light emission of the screen area.

With the development of technology, compared with the backlight of the traditional Mini LED display panel, the backlight of the existing Mini LED display panel uses RGB three-color LED lamp beads instead of the finished white lamp beads, which has better clarity and color purity. However, when one of the RGB three-color lamp beads is damaged, abnormal display is likely to occur at the damaged lamp bead on the Mini LED display panel.

Contents of the invention

The invention provides a backlight module, a preparation method of the backlight module and a display device, so as to reduce the influence of damage of lamp beads on the display effect of the display panel.

According to an aspect of the present invention, a backlight module is provided, including: a substrate, a plurality of light emitting units, and a plurality of condensing lenses;

A plurality of the light-emitting units are densely arranged in an array on the substrate, and the light-emitting units include: red LED beads, green LED beads and blue LED beads;

A plurality of the condensing lenses are arranged in an array, corresponding to the light-emitting units one by one, and the condensing lenses are arranged on the side of the light-emitting unit away from the substrate; the condensing lenses are used for The light emitted by the red LED lamp bead, the green LED lamp bead and the blue LED lamp bead are mixed and converged to form white light.

Optionally, the red LED bead, the green LED bead and the blue LED bead are closely arranged in the light emitting unit.

Optionally, the distance between the light emitting unit and the condensing lens is 0.5-1 times the focal length of the condensing lens.

Optionally, the condensing lens is a Fresnel lens, and the Fresnel lens is arranged such that a smooth surface side of the Fresnel lens is away from the light emitting unit.

Optionally, the backlight module further includes: a diffusion layer; the entire surface of the diffusion layer is disposed on one side of the smooth surface of the condenser lens.

Optionally, the diffusion layer is a complete and continuous polyethylene terephthalate film.

Optionally, the backlight module also includes: a light guide plate;

The light guide plate is disposed on a side of the diffusion layer away from the light-emitting unit, and the light guide plate is used to receive light passing through the diffusion layer to emit light uniformly.

According to another aspect of the present invention, a method for preparing a backlight module is provided, including:

The light panels of each light-emitting unit are spliced into a large-size backlight panel in an array; wherein, the light panels of the light-emitting unit include a substrate, a red LED bead, a green LED bead, and a blue LED bead, and the red LED bead , the green LED lamp bead and the blue LED lamp bead are arranged on the substrate;

A continuous condensing lens bracket layer is placed on the large-size backlight plate; wherein, the condensing lens bracket layer includes a plurality of brackets arranged in an array, and each of the brackets corresponds to each of the light-emitting units;

A plurality of condensing lenses are arranged on the side of the condensing lens support layer away from the large-size backlight plate, and the plurality of condensing lenses are arranged in an array to form the backlight module.

Optionally, while a plurality of condenser lenses are arranged on the side of the condenser lens support layer away from the large-size backlight plate, it also includes:

A plurality of the condensing lenses are attached to one side surface of the entire diffusion layer in an array, so that each of the condensing lenses corresponds to each of the light-emitting units;

A light guide plate is bonded to the surface of the other side of the entire surface of the diffusion layer to form a light management layer; wherein the light treatment layer includes the light guide plate, the entire surface of the diffusion layer, and a plurality of the condensing lenses;

The side of the light processing layer provided with the plurality of condensing lenses is placed on the side of the condensing lens support layer away from the large-size backlight panel to form the backlight module.

According to another aspect of the present invention, a display device is also provided, including the backlight module as described in the first aspect.

In the technical solution of the embodiment of the present invention, a plurality of light-emitting units are distributed in an array on the backlight substrate, and a condenser lens is correspondingly arranged on the side of the light-emitting surface of each light-emitting unit. The three-color light emitted by the green LED lamp bead and the blue LED lamp bead are mixed and converged into white light, which is used as the backlight source of the display panel. By using a condenser lens, the area where the light emitted by each light-emitting unit is mixed into white light is reduced, so that the light-emitting units are arranged in an array on the same area of the backlight substrate, and the number of light-emitting units can be increased to achieve fine adjustment. The luminous brightness of the light-emitting area is improved, and when one LED lamp bead in one light-emitting unit is damaged, the display effect of the entire display panel is less affected, and the display effect of the display panel is improved.

It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will be easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic top view of a backlight module provided according to an embodiment of the present invention;

Fig. 2 is a front view structural diagram of a light emitting unit in a backlight module provided according to an embodiment of the present invention;

3 is a schematic top view of a light emitting unit in a backlight module according to an embodiment of the present invention;

4 is a schematic structural view of a light emitting unit in another backlight module provided according to an embodiment of the present invention;

5 is a flow chart of a method for preparing a backlight module according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a display device provided according to an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

An embodiment of the present invention provides a backlight module. FIG. 1 is a schematic top view of a backlight module provided by an embodiment of the present invention. As shown in FIG. 1 , the backlight module includes: a substrate 10 , a plurality of light emitting units 20 , and a plurality of condenser lenses 30 .

A plurality of light-emitting units 20 are densely arranged in an array on the substrate 10 , and the light-emitting units 20 include: red LED beads, green LED beads and blue LED beads.

A plurality of condensing lenses 30 are arranged in an array, corresponding to the light emitting unit 20 one by one, and the condensing lens 30 is arranged on the side of the light emitting unit 20 away from the substrate 10; The light emitted by the LED lamp beads and the blue LED lamp beads are mixed and converged to form white light.

Specifically, the substrate 10 of the backlight module is a flexible circuit board (Flexible Printed Circuit, FPC), and the flexible circuit board is spliced by a plurality of small circuit boards, and each small circuit board is provided with a light emitting unit. Each light emitting unit 20 is arranged in an array on the substrate 10 , and each light emitting unit 20 emits light independently. The condensing lens 30 is an optical lens for condensing light. One side of each light-emitting unit 20 light-emitting surface is provided with a condenser lens 30, therefore, the condenser lens 30 is also arranged in an array, corresponding to each light-emitting unit 20 one-to-one, and the quantity of the condenser lens 30 is the same as that of the light-emitting unit 20. same amount.

The red LED lamp bead, green LED lamp bead and blue LED lamp bead included in the light emitting unit 20 emit light at the same time, and the light is converged after passing through the condenser lens 30 to mix into white light, which is used as a backlight source of the display panel. Wherein, the red LED lamp bead, the green LED lamp bead and the blue LED lamp bead are not shown in FIG. 1 . The condenser lens 30 can reduce the light mixing area of each light-emitting unit 20, that is, after the three-color light emitted by the red LED light beads, green LED light beads and blue LED light beads in each light-emitting unit 20 is mixed into white light, The irradiated area is smaller. Therefore, on the substrate 10 with the same area, the number of light-emitting units 20 arranged in an array can be increased to achieve the effect of dividing the display panel into more light-emitting areas, finely adjusting the luminance of each light-emitting area, and improving the performance of the display panel. brightness and contrast. And because the light-emitting area controlled by each light-emitting unit 20 is reduced, when one LED lamp bead in one light-emitting unit 20 is damaged, the influence of the light-emitting unit 20 on the display effect of the entire display panel is reduced, and the adjacent light-emitting units 20 has a certain effect of supplementing light, thereby improving the display effect of the display panel.

In the technical solution of this embodiment, a plurality of light-emitting units are distributed in an array on the backlight substrate, and a condenser lens is correspondingly arranged on the side of the light-emitting surface of each light-emitting unit. The three-color light emitted by the green LED lamp beads and the blue LED lamp beads is mixed and converged into white light, which is used as a backlight source for the display panel. By using a condenser lens, the area where the light emitted by each light-emitting unit is mixed into white light is reduced, so that the light-emitting units are arranged in an array on the same area of the backlight substrate, and the number of light-emitting units can be increased to achieve fine adjustment. The luminous brightness of the light-emitting area is improved, and when one LED lamp bead in one light-emitting unit is damaged, the display effect of the entire display panel is less affected, and the display effect of the display panel is improved.

Optionally, FIG. 2 is a front structural schematic diagram of a light emitting unit in a backlight module provided by an embodiment of the present invention. On the basis of the above embodiments, as shown in FIG. 2 , the red LED lamp bead 21 , the green LED lamp bead 22 and the blue LED lamp bead 23 are closely arranged in the light emitting unit 20 .

Specifically, in one light emitting unit 20, the red LED lamp bead 21, the green LED lamp bead 22 and the blue LED lamp bead 23 need to be closely arranged so that the red LED lamp bead 21, the green LED lamp bead 22 and the blue LED lamp bead The lights emitted by the lamp beads 23 can be mixed to form white light after passing through the condenser lens 30 . The arrangement shape and arrangement sequence of the LED lamp beads provided in all the light emitting units 20 on the entire backlight substrate 10 are the same. Wherein, the red LED lamp bead 21 , the green LED lamp bead 22 and the blue LED lamp bead 23 in one light emitting unit 20 can be arranged to form different shapes, which is not limited here. Moreover, the order of arrangement of the red LED lamp bead 21 , the green LED lamp bead 22 and the blue LED lamp bead 23 in one light emitting unit 20 is not limited. Exemplarily, FIG. 3 is a top structural schematic diagram of a light emitting unit in a backlight module provided by an embodiment of the present invention. FIG. 3 shows that the red LED lamp bead 21 , the green LED lamp bead 22 and the blue LED lamp bead 23 are arranged in a triangle.

Optionally, on the basis of the above embodiment, continue referring to FIG. 2 , the distance h between the light emitting unit 20 and the condenser lens 30 is 0.5˜1 times the focal length of the condenser lens 30 .

Specifically, setting the distance between the light emitting unit 20 and the condenser lens 20 to be 0.5 to 1 times the focal length can make the red LED lamp beads 21, green LED lamp beads 22 and blue LED lamp beads 23 in the light emitting unit 20 emit light. The light is mixed into white light, and the backlight source is guaranteed to have high brightness, so that the display panel has a good display effect.

Optionally, on the basis of the above embodiment, continue to refer to FIG. 2 , the condenser lens 30 is a Fresnel lens 31 , and the Fresnel lens 31 is arranged so that the smooth surface side of the Fresnel lens 31 is away from the light emitting unit 20 .

Specifically, the Fresnel lens 31 is a threaded lens made of polyolefin material or glass. The convex side of the Fresnel lens 31 with threads is set close to the light-emitting unit 20 , and the smooth surface side of the Fresnel lens 31 is away from the light-emitting unit 20 , so that parallel light can be converged after entering the Fresnel lens 31 . The three-color light emitted by the light emitting unit 20 is incident on the threaded texture on the convex side of the Fresnel lens 31, converges and emerges from the smooth surface side, so that the red LED lamp bead 21, the green LED lamp bead 22 and the blue LED lamp bead The light of three colors respectively emitted by 23 is mixed into white light, and the area of mixed into white light is reduced, so that the number of light emitting units 20 arranged on the backlight substrate 10 is increased.

Optionally, FIG. 4 is a schematic structural diagram of a light emitting unit in another backlight module provided by an embodiment of the present invention. On the basis of the above embodiments, as shown in FIG. 4 , the backlight module further includes: a diffusion layer 40 . The diffusion layer 40 is provided entirely on the smooth surface side of the condenser lens 30 .

Specifically, the diffusion layer 40 is a continuous and complete film layer, and the smooth surface of the condenser lens 30 is attached to one side of the diffusion layer 40 . When the light emitted by the red LED lamp beads 21, the green LED lamp beads 22 and the blue LED lamp beads 23 exits from the smooth surface side of the condenser lens 30, it is converging white light. After the white light passes through the diffusion layer 40, the converging white light can It is transformed into diffused white light with a certain diffusion angle, so that the backlight of the entire display panel emits more uniform light. Exemplarily, the diffusion layer 40 is a complete continuous polyethylene terephthalate film. The thin film is a transparent thin film, which allows all the white light emitted by the condenser lens 30 to pass through, so that the display panel has a good display effect.

Optionally, on the basis of the above embodiments, referring to FIG. 4 , the backlight module further includes: a light guide plate 50 .

The light guide plate 50 is disposed on a side of the diffusion layer 40 away from the light emitting unit 20 , and the light guide plate 50 is used for receiving light passing through the diffusion layer 40 to emit light uniformly.

Specifically, the white light rays passing through the diffusion layer 40 are incident on the light guide plate 50, and after being irradiated to each light guide point, they are reflected at various angles, and then emerge from the light emitting surface of the light guide plate 50, so that the light emitted by the backlight module is more uniform, ensuring The display effect of the display panel.

The embodiment of the present invention also provides a method for preparing a backlight module. FIG. 5 is a flow chart of a method for manufacturing a backlight module provided by an embodiment of the present invention. As shown in Figure 5, the preparation method comprises:

S110. Splice the light panels of each light-emitting unit into a large-size backlight panel in an array; wherein, the light panels of the light-emitting unit include a substrate, a red LED bead, a green LED bead, and a blue LED bead, and the red LED bead, green LED bead, and The LED lamp bead and the blue LED lamp bead are arranged on the substrate.

Specifically, the substrate in the light board of each light emitting unit may be rectangular or square, and the red LED light beads, green LED light beads and blue LED light beads arranged in close proximity are arranged on the substrate. The light panels of the discrete light-emitting units are spliced in an array to obtain a large-sized complete backlight panel.

S120. Place a continuous condensing lens bracket layer on the large-size backlight plate; wherein, the condensing lens bracket layer includes a plurality of brackets arranged in an array, and each bracket corresponds to each light emitting unit one by one.

Specifically, a plurality of light-emitting units are arranged in an array on the backlight plate, and a condensing lens support layer is placed on the substrate in the backlight plate to fix and support each condensing lens to the light-emitting surface side of each light-emitting unit. Since each condenser lens is arranged separately and arranged in an array, the condenser lens support layer includes a plurality of condenser lens supports, and each condenser lens support is a hollow ring structure connected as a whole. Each condensing lens bracket is provided in one-to-one correspondence with the light emitting unit.

S130, setting multiple condenser lenses on the side of the condenser lens support layer away from the large-size backlight plate, and the multiple condenser lenses are arranged in an array to form a backlight module.

Specifically, the condensing lens is placed on the condensing lens support layer to support the condensing lens, and the distance between each condensing lens and the light-emitting unit is kept consistent, so that the backlight module emits light with uniform brightness.

The backlight module prepared by the backlight module preparation method provided in the embodiment of the present invention can reduce the area where the light-emitting unit mixes light into white light, thereby increasing the number of light-emitting units provided on the backlight substrate per unit area. Therefore, when a lamp bead in the light emitting unit is damaged, the display effect of the entire display panel is less affected.

Optionally, on the basis of the foregoing embodiments, step S130 includes:

S1301. Attach multiple condensing lenses to one surface of the entire diffusion layer in an array, so that each condensing lens corresponds to each light emitting unit one by one.

Specifically, at the position where the surface of the diffusion layer corresponds to the light-emitting units one by one, a plurality of condenser lens arrays are pasted on the diffusion layer by using OCA optical glue, so as to fix the condenser lenses.

S1302. Attach a light guide plate to the surface of the other side of the entire diffusion layer to form a light processing layer; wherein, the light processing layer includes a light guide plate, an entire diffusion layer, and a plurality of condensing lenses.

Specifically, the light guide plate is bonded to the surface of the other side of the diffusion layer to form the light management layer. The light processing layer can mix the three-color light emitted by the light-emitting unit to form white light, and can diffuse the white light so that the backlight source of the display panel emits light evenly.

S1303. Place the side of the light processing layer provided with a plurality of condenser lenses on the side of the condenser lens support layer away from the large-size backlight panel to form a backlight module.

The embodiment of the present invention also provides a display device. FIG. 6 is a schematic structural diagram of a display device provided by an embodiment of the present invention. As shown in FIG. 6 , the display device includes the backlight module described in any of the above-mentioned embodiments. Wherein, the backlight module includes a condenser lens arranged on one side of the light-emitting surface of the light-emitting unit, which can mix the three-color light emitted by the red LED lamp beads, green LED lamp beads and blue LED lamp beads in the light-emitting unit into white light, And the light mixing area is small, so that the number of light-emitting units can be increased on the same area of the backlight substrate, reducing the impact of a damaged lamp bead in the light-emitting unit on the display effect of the display panel, and improving the display effect.

The above specific implementation methods do not constitute a limitation to the protection scope of the present invention. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A backlight module, comprising: a substrate, a plurality of light emitting units, and a plurality of condensing lenses; A plurality of the light-emitting units are densely arranged in an array on the substrate, and the light-emitting units include: red LED beads, green LED beads and blue LED beads; A plurality of the condensing lenses are arranged in an array, corresponding to the light-emitting units one by one, and the condensing lenses are arranged on the side of the light-emitting unit away from the substrate; the condensing lenses are used for The light emitted by the red LED lamp bead, the green LED lamp bead and the blue LED lamp bead are mixed and converged to form white light. 2 . The backlight module according to claim 1 , wherein the red LED bead, the green LED bead and the blue LED bead are closely arranged in the light emitting unit. 3 . The backlight module according to claim 1 , wherein the distance between the light emitting unit and the condensing lens is 0.5-1 times the focal length of the condensing lens. 4 . 4. The backlight module according to claim 3, wherein the condenser lens is a Fresnel lens, and the Fresnel lens is arranged so that the smooth surface side of the Fresnel lens is away from the Lighting unit. 5 . The backlight module according to claim 1 , further comprising: a diffusion layer; the entire surface of the diffusion layer is disposed on one side of the smooth surface of the condenser lens. 6. The backlight module according to claim 5, wherein the diffusion layer is a complete and continuous polyethylene terephthalate film. 7. The backlight module according to claim 5, further comprising: a light guide plate; The light guide plate is disposed on a side of the diffusion layer away from the light-emitting unit, and the light guide plate is used to receive light passing through the diffusion layer to emit light uniformly. 8. A method for preparing a backlight module, comprising: The light panels of each light-emitting unit are spliced into a large-size backlight panel in an array; wherein, the light panels of the light-emitting unit include a substrate, a red LED bead, a green LED bead, and a blue LED bead, and the red LED bead , the green LED lamp bead and the blue LED lamp bead are arranged on the substrate; A continuous condensing lens bracket layer is placed on the large-size backlight plate; wherein, the condensing lens bracket layer includes a plurality of brackets arranged in an array, and each of the brackets corresponds to each of the light-emitting units; A plurality of condensing lenses are arranged on the side of the condensing lens support layer away from the large-size backlight plate, and the plurality of condensing lenses are arranged in an array to form the backlight module. 9. The preparation method of the backlight module according to claim 8, characterized in that, while a plurality of condenser lenses are arranged on the side of the condenser lens support layer away from the large-size backlight plate, it also includes: A plurality of the condensing lenses are attached to one side surface of the entire diffusion layer in an array, so that each of the condensing lenses corresponds to each of the light-emitting units; A light guide plate is bonded to the surface of the other side of the entire surface of the diffusion layer to form a light management layer; wherein the light treatment layer includes the light guide plate, the entire surface of the diffusion layer, and a plurality of the condensing lenses; The side of the light processing layer provided with the plurality of condensing lenses is placed on the side of the condensing lens support layer away from the large-size backlight panel to form the backlight module. 10. A display device, comprising the backlight module according to any one of claims 1-7.

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