CN114019720B - Backlight module and display device - Google Patents

Abstract

The embodiment of the application provides a backlight module and a display device. According to the backlight module provided by the embodiment of the application, the first microstructures are arranged on the surface of the primary lens of the light emitting device, and/or the primary lens comprises the second light-transmitting film layers with different refractive indexes, the first microstructures and/or the second light-transmitting film layers with different refractive indexes can be utilized to realize light diffusion, so that the light emitting of the light emitting device is more uniform, and when the light emitting of the light emitting device is more uniform, the backlight module can realize light uniformity at a smaller light mixing distance, so that the thickness of the backlight module can be reduced, and the light and thin design of the display device is realized.

Description

Backlight module and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a backlight module and a display device.

Background

With the continuous development of display technology, display devices are gradually developed towards light and thin. The conventional display device generally includes a housing, a display panel fixedly received in the housing, a middle frame, a backlight module, and the like, and the thickness of the backlight module is one of the key factors determining the thickness of the display device.

In order to obtain a uniform light emitting effect, the conventional backlight module is generally provided with a longer light mixing distance, which results in a larger thickness of the backlight module, thereby being unfavorable for the light and thin design of the display device.

Disclosure of Invention

The embodiment of the application provides a backlight module and a display device, wherein the thickness of the backlight module is smaller, which is favorable for realizing the light and thin design of the display device.

In a first aspect, an embodiment of the present application provides a backlight module, including:

the light source comprises a plurality of light emitting devices, wherein each light emitting device comprises a light emitting element and a primary lens, and the primary lens is coated on the outer surface of the light emitting element;

the surface of one side of the primary lens, which is away from the light-emitting element, is provided with a plurality of first microstructures, and/or the primary lens comprises a plurality of first light-transmitting film layers which are arranged in a laminated mode, and the refractive indexes of the first light-transmitting film layers gradually decrease in the direction from one side of the primary lens, which faces the light-emitting element, to one side of the primary lens, which is away from the light-emitting element.

In some embodiments, the light emitting device further comprises a secondary lens disposed on a side of the primary lens facing away from the light emitting element, and a space is provided between the secondary lens and the primary lens;

the surface of the secondary lens, which is away from one side of the primary lens, is provided with a plurality of second microstructures, and/or the secondary lens comprises a plurality of second light-transmitting film layers which are arranged in a stacked mode, and the refractive indexes of the second light-transmitting film layers are different.

In some embodiments, the refractive index of the plurality of second light-transmitting film layers gradually decreases or gradually increases in a direction from a side of the secondary lens facing the primary lens to a side of the secondary lens facing away from the primary lens.

In some embodiments, the backlight module further includes a diffusion plate, where the diffusion plate is disposed on the light emitting side of the light source, and the diffusion plate includes a plurality of diffusion layers stacked together, and refractive indexes of the diffusion layers are different from each other; and/or

A plurality of third microstructures are arranged on the surface of one side, away from the light source, of the diffusion plate; and/or

The diffusion plate contains a plurality of bubbles therein.

In some embodiments, the refractive index of the plurality of diffusion layers gradually decreases or gradually increases in a direction from a side of the diffusion plate facing the light source to a side of the diffusion plate facing away from the light source.

In some embodiments, the backlight module further comprises a back plate, wherein the back plate comprises a bottom plate and a plurality of side plates connected with the bottom plate;

the light source comprises a plurality of light bars which are arranged at intervals, and the light bars are arranged on the bottom plate;

the light bar comprises a circuit board and a plurality of light emitting devices which are arranged on the circuit board and are arranged at intervals in sequence.

In some embodiments, the first reflective sheet includes a first arc portion protruding in a direction away from the base plate; and/or

The second reflecting sheet comprises a second arc-shaped part, and the second arc-shaped part protrudes towards the direction close to the bottom plate.

In some embodiments, the bottom plate is further provided with a plurality of first reflecting plates and a plurality of second reflecting plates, the first reflecting plates are respectively arranged in the interval areas among the light bars, and the second reflecting plates cover the side plates and the area, on the bottom plate, between the connection positions of the side plates and the bottom plate and the outermost light bars.

In some embodiments, the backlight module further includes a diffusion plate, where the diffusion plate is disposed on a light emitting side of the light source, and the diffusion plate includes a plurality of arc structures that are sequentially connected, where the plurality of arc structures are disposed corresponding to the plurality of light bars, and the arc structures protrude toward a direction away from the bottom plate; or alternatively

The diffusion plate comprises a plurality of main body parts which are sequentially arranged, a waist is arranged between any two adjacent main body parts, the waist is connected with the two adjacent main body parts, the thickness of the main body parts is larger than that of the waist, the waist corresponds to the lamp strip, and a groove is formed in one side of the waist, which faces the lamp strip.

In a second aspect, an embodiment of the present application further provides a display device, including the backlight module described above.

According to the backlight module provided by the embodiment of the application, the first microstructures are arranged on the surface of the primary lens of the light emitting device, and/or the primary lens comprises the second light-transmitting film layers with different refractive indexes, the first microstructures and/or the second light-transmitting film layers with different refractive indexes can be utilized to realize light diffusion, so that the light emitting of the light emitting device is more uniform, and when the light emitting of the light emitting device is more uniform, the backlight module can realize light uniformity at a smaller light mixing distance, so that the thickness of the backlight module can be reduced, and the light and thin design of the display device is realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a first structure of a light emitting device according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a second structure of a light emitting device according to an embodiment of the present application.

Fig. 4 is a schematic view of a first structure of a diffusion plate according to an embodiment of the present application.

Fig. 5 is a schematic view of a second structure of a diffusion plate according to an embodiment of the present application.

Fig. 6 is a schematic view of a third structure of a diffusion plate according to an embodiment of the present disclosure.

Fig. 7 is a schematic view of a fourth structure of a diffusion plate according to an embodiment of the present disclosure.

Fig. 8 is a schematic view of a fifth structure of a diffusion plate according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram of a second structure of a backlight module according to an embodiment of the present application.

Fig. 10 is a schematic diagram of a third structure of a backlight module according to an embodiment of the present application.

Fig. 11 is a schematic diagram of a fourth structure of a backlight module according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a fifth structure of a backlight module according to an embodiment of the present application.

Fig. 13 is a schematic diagram of a sixth structure of a backlight module according to an embodiment of the present application.

Fig. 14 is a schematic diagram of a seventh structure of a backlight module according to an embodiment of the present application.

Fig. 15 is a schematic view of an eighth structure of a backlight module according to an embodiment of the present application.

Fig. 16 is a ninth structural schematic diagram of a backlight module according to an embodiment of the present application.

Fig. 17 is a schematic view of a tenth structure of a backlight module according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Referring to fig. 1 to 3, fig. 1 is a first schematic structural diagram of a backlight module provided in an embodiment of the present application, fig. 2 is a first schematic structural diagram of a light emitting device provided in an embodiment of the present application, and fig. 3 is a second schematic structural diagram of a light emitting device provided in an embodiment of the present application. The embodiment of the application provides a backlight module 100, which comprises a light source, wherein the light source comprises a plurality of light emitting devices 11, the light emitting devices 11 comprise a light emitting element 110 and a primary lens 111, and the primary lens 111 is coated on the outer surface of the light emitting element 110.

Referring to fig. 2, the primary lens 111 may include a plurality of first light-transmitting film layers 102 stacked, and the refractive index of the plurality of first light-transmitting film layers 102 gradually decreases in a direction from a side of the primary lens 111 facing the light-emitting element 110 to a side of the primary lens 111 facing away from the light-emitting element 110.

In any embodiment of the present application, a plurality refers to two or more, for example, three, four, five, six, seven, eight, or the like.

Referring to fig. 3, a plurality of first microstructures 103 may be disposed on a surface of the primary lens 111 facing away from the light emitting element 110.

The light emitting element 110 may be an LED (Light Emitting Diode ) chip, for example.

Illustratively, the primary lens 111 may be an encapsulant.

Referring to fig. 3, in the technical solution that the surface of the primary lens 111 facing away from the light emitting element 110 is provided with a plurality of first microstructures 103", it can be understood that the surface of the primary lens 111 facing away from the light emitting element 110 is a light emitting surface of the primary lens 111, when the light emitting surface of the primary lens 111 is provided with the plurality of first microstructures 103, the light can be diffused by the first microstructures 103, so that the emitted light of the light emitting device 11 is more uniform, and when the light emitting effect of the light emitting device 11 is more uniform, the light mixing distance of the backlight module 100 can be properly reduced, thereby reducing the thickness of the backlight module 100 and further realizing the light and thin design of the display device.

Illustratively, the first microstructures 103 may include recesses and/or protrusions, which may be arcuate protrusions or pyramidal protrusions, and recesses may be arcuate grooves or pyramidal grooves.

Referring to fig. 2, for the technical solution that the primary lens 111 includes a plurality of first light-transmitting film layers 102 stacked and disposed, in a direction from a side of the primary lens 111 facing the light-emitting element 110 to a side of the primary lens 111 facing away from the light-emitting element 110, the refractive indexes of the plurality of first light-transmitting film layers 102 gradually decrease, it is understood that when the refractive indexes of the plurality of first light-transmitting film layers 102 gradually decrease, the emission angle range of the light emitted by the light-emitting device 11 can be gradually expanded by the plurality of first light-transmitting film layers 102, so that the light emitted by the light-emitting device 11 is more uniform, and when the light-emitting effect of the light-emitting device 11 is more uniform, the light-mixing distance of the backlight module 100 can be properly reduced, thereby reducing the thickness of the backlight module 100 and further realizing the light and thin design of the display device.

In some embodiments, when the backlight module 100 can have a smaller thickness by improving the structure other than the primary lens 111, the refractive index of the plurality of first light-transmitting film layers 102 may be gradually increased from the side of the primary lens 111 facing the light-emitting element 110 to the side of the secondary lens 112 facing away from the light-emitting element 110, and it should be noted that when the refractive index of the plurality of first light-transmitting film layers 102 is gradually increased, the brightness of the light transmitted from the primary lens 111 may be increased, so as to further enhance the brightness of the light emitted from the backlight module 100, thereby improving the display effect of the display device.

It should be noted that, when the surface of the primary lens 111 facing away from the light emitting element 110 is provided with the plurality of first microstructures 103, the material of the primary lens 111 may be a single material, i.e. the refractive index of all regions of the primary lens 111 is the same. Alternatively, the primary lens 111 may have a structure in which the primary lens 111 includes a plurality of first light-transmitting film layers 102 stacked and the first microstructures 103 are provided on the outer surface of the outermost first light-transmitting film layer 102, and the first microstructures 103 may have an effect of diffusing light and making the light emitted from the light-emitting surface of the primary lens 111 more uniform.

Referring to fig. 2 and 3, the light emitting device 11 may further include a secondary lens 112, wherein the secondary lens 112 is disposed on a side of the primary lens 111 facing away from the light emitting element 110, and a space is provided between the secondary lens 112 and the primary lens 111.

Referring to fig. 2, the secondary lens 112 may include a plurality of second light-transmitting film layers 104 stacked together, and the refractive indexes of the plurality of second light-transmitting film layers 104 are different. It can be appreciated that by disposing the plurality of second transparent film layers 104 with different refractive indexes, the secondary lens 112 can achieve a better balance between the uniformity of light output and the brightness of light output.

Referring to fig. 3, a plurality of second microstructures 105 may be disposed on a surface of the secondary lens 112 facing away from the primary lens 111.

It should be noted that the refractive indices of the plurality of second light-transmitting film layers 104 may be set to gradually decrease or set to gradually increase in a direction from the side on the secondary lens 112 toward the primary lens 111 to the side on the secondary lens 112 away from the primary lens 111.

For the technical scheme of "the refractive index of the plurality of second light-transmitting film layers 104 gradually decreases in the direction from the side of the secondary lens 112 facing the primary lens 111 to the side of the secondary lens 112 facing away from the primary lens 111", it can be understood that when the refractive index of the plurality of second light-transmitting film layers 104 gradually decreases, the plurality of second light-transmitting film layers 104 can gradually expand the emission angle range of the light emitting rays of the light emitting device 11, so that the light emitting rays of the light emitting device 11 are more uniform, and when the light emitting effect of the light emitting device 11 is more uniform, the light mixing distance of the backlight module 100 can be properly reduced, thereby reducing the thickness of the backlight module 100 and further realizing the light and thin design of the display device.

In some embodiments, when the backlight module 100 can have a smaller thickness by modifying the structure other than the secondary lens 112, the refractive index of the plurality of second light-transmitting film layers 104 may be gradually increased from the side of the secondary lens 112 facing the primary lens 111 to the side of the secondary lens 112 facing away from the primary lens 111. When the refractive indexes of the second light-transmitting film layers 104 are gradually increased, the brightness of the light transmitted from the secondary lens 112 can be increased, so as to enhance the brightness of the backlight module 100, thereby improving the display effect of the display device.

Illustratively, the second microstructures 105 may include depressions and/or protrusions, which may be arcuate protrusions or pyramidal protrusions, and depressions, which may be arcuate grooves or pyramidal grooves.

When the surface of the secondary lens 112 facing away from the primary lens 111 is provided with a plurality of second microstructures 105, the material of the secondary lens 112 may be a single material, i.e. the refractive index of all regions of the secondary lens 112 is the same. Alternatively, the secondary lens 112 may have a structure in which the secondary lens 112 includes a plurality of second light-transmitting film layers 104 stacked and the second microstructures 105 are provided on the outer surface of the outermost second light-transmitting film layer 104, and the second microstructures 105 may diffuse light and make the light emitted from the light-emitting surface of the secondary lens 112 more uniform.

Referring to fig. 1, the backlight module 100 may further include a diffusion plate 20, where the diffusion plate 20 is disposed on the light emitting side of the light source.

Referring to fig. 4, fig. 4 is a schematic view of a first structure of a diffusion plate according to an embodiment of the present disclosure. The diffusion plate 20 may include a plurality of diffusion layers 21 stacked, and the plurality of diffusion layers 21 may have different refractive indexes. It is understood that by providing a plurality of diffusion layers 21 having different refractive indexes, the diffusion plate 20 can achieve a better balance between uniformity of light emission and brightness of light emission.

Referring to fig. 4, the refractive indexes of the plurality of diffusion layers 21 may be set to gradually decrease or set to gradually increase in a direction from a side of the diffusion plate 20 facing the light source to a side of the diffusion plate 20 facing away from the light source.

For the technical scheme of "in the direction from the side of the diffusion plate 20 facing the light source to the side of the diffusion plate 20 facing away from the light source", the refractive indexes of the diffusion layers 21 gradually decrease ", it can be understood that when the refractive indexes of the diffusion layers 21 gradually decrease, the diffusion layers 21 can gradually expand the emission angle range of the outgoing light, so that the outgoing light of the diffusion plate 20 is more uniform, and at this time, the light mixing distance of the backlight module 100 can be properly reduced, thereby reducing the thickness of the backlight module 100, and further realizing the light and thin design of the display device.

In some embodiments, when the backlight module 100 can have a smaller thickness by improving the structure other than the diffusion plate 20, the refractive indexes of the diffusion layers 21 may be gradually increased from the side of the diffusion plate 20 facing the light source to the side of the diffusion plate 20 facing away from the light source, and when the refractive indexes of the diffusion layers 21 are gradually increased, the brightness of the light emitted from the diffusion plate 20 may be enhanced, so as to enhance the brightness of the light emitted from the backlight module 100, thereby enhancing the display effect of the display device.

Referring to fig. 5, fig. 5 is a schematic view of a second structure of a diffusion plate according to an embodiment of the present disclosure. The surface of the diffusion plate 20 facing away from the light source may be provided with a plurality of third microstructures 23.

To the technical scheme that the surface of the diffusion plate 20, which is away from the light source side, is provided with a plurality of third microstructures 23", it can be understood that the surface of the diffusion plate 20, which is away from the light source side, is the light emitting surface of the diffusion plate 20, and when the surface of the diffusion plate 20, which is away from the light source side, is provided with a plurality of third microstructures 23, the third microstructures 23 can play a role of diffusing light, so that the light emitting of the diffusion plate 20 is more uniform.

Illustratively, the third microstructures 23 may include recesses and/or protrusions, which may be arcuate protrusions or pyramidal protrusions, and recesses may be arcuate grooves or pyramidal grooves.

It should be noted that, when the surface of the diffusion plate 20 facing away from the light source is provided with the plurality of third microstructures 23, the material of the diffusion plate 20 may be a single material, i.e. the refractive index of all regions of the diffusion plate 20 is the same. Alternatively, the diffusion plate 20 may have a structure in which the diffusion plate 20 includes a plurality of diffusion layers 21 stacked, and the third microstructures 23 are provided on the outer surface of the outermost diffusion layer 21, and the third microstructures 23 may diffuse light rays and make the light rays emitted from the light emitting surface of the diffusion plate 20 more uniform.

Referring to fig. 6, fig. 6 is a schematic view of a third structure of a diffusion plate according to an embodiment of the present disclosure. The diffusion plate 20 contains a plurality of bubbles 22 therein.

For the scheme that the diffusion plate 20 contains a plurality of bubbles 22, it can be understood that the bubbles 22 can play a role of diffusing particles, so that the light emitted by the diffusion plate 20 is more uniform, and the thickness of the backlight module 100 can be properly reduced on the basis, so that the display device using the backlight module 100 is lighter and thinner.

The gas within the bubbles 22 may be, for example, air, but may also be other gases, such as inert gases and the like.

Illustratively, the plurality of bubbles 22 are uniformly distributed within the diffuser plate 20.

In some embodiments, the diffusion plate 20 may also have a structure in which the diffusion plate 20 includes a plurality of diffusion layers 21 stacked, the refractive indexes of the diffusion layers 21 are different (for example, gradually increasing or gradually decreasing in a certain direction), each diffusion layer 21 includes a plurality of bubbles 22, and the outer surface of the outermost diffusion layer 21 is provided with a plurality of third microstructures 23.

Referring to fig. 1, the backlight module 100 may further include a back plate 40, where the back plate 40 includes a bottom plate 41 and a plurality of side plates 42 connected to the bottom plate 41. The light source may include a plurality of light bars 10 disposed at intervals, and the plurality of light bars 10 are disposed on the bottom plate 41. The light bar 10 includes a circuit board 120 and a plurality of light emitting devices 11 disposed on the circuit board 120 and arranged at intervals in sequence.

Referring to fig. 7, fig. 7 is a schematic view of a fourth structure of a diffusion plate according to an embodiment of the present disclosure. The diffusion plate 20 may include a plurality of arc structures 24 sequentially connected, and in the backlight module 100, the plurality of arc structures 24 are disposed corresponding to the plurality of light bars 10, respectively, and the arc structures 24 protrude toward a direction away from the bottom plate 41.

Referring to fig. 8, fig. 8 is a schematic view of a fifth structure of a diffusion plate according to an embodiment of the present disclosure. The diffusion plate 20 may include a plurality of main body portions 25 arranged in sequence, a waist portion 26 is disposed between any two adjacent main body portions 25, the waist portion 26 connects the two adjacent main body portions 25, the thickness of the main body portion 25 is greater than that of the waist portion 26, the waist portion 26 is disposed corresponding to the light bar 10, and a groove is disposed on one side of the waist portion 26 facing the light bar 10.

Referring to fig. 9 and fig. 10, fig. 9 is a schematic diagram of a second structure of a backlight module according to an embodiment of the present application, and fig. 10 is a schematic diagram of a third structure of a backlight module according to an embodiment of the present application. To the technical scheme that "the diffusion plate 20 includes a plurality of arc structures 24 that link to each other in proper order", it can be appreciated that, because a plurality of arc structures 24 correspond a plurality of lamp strips 10 respectively and set up to arc structure 24 is towards keeping away from the direction protrusion of bottom plate 41, when the light that lamp strip 10 sent out is incident to arc structure 24, arc structure 24 can diffuse incident light, improve "the luminance of the regional height of corresponding lamp strip 10 on the diffusion plate 20, the condition of the regional luminance weak of interval between corresponding adjacent lamp strip 10", improve the play light homogeneity of diffusion plate 20.

Referring to fig. 11 and 12, fig. 11 is a fourth structural schematic diagram of a backlight module according to an embodiment of the present application, and fig. 12 is a fifth structural schematic diagram of a backlight module according to an embodiment of the present application. For the technical scheme that the diffusion plate 20 includes a plurality of main body portions 25 and a plurality of waist portions 26, it can be understood that, because the waist portions 26 are disposed corresponding to the light bars 10, and a groove is disposed on one side of the waist portions 26 facing the light bars 10, when the light emitted by the light bars 10 is incident to the waist portions 26, the waist portions 26 can diffuse the incident light, so as to improve the conditions of high brightness of the area of the diffusion plate 20 corresponding to the light bars 10 and weak brightness of the area corresponding to the interval between the adjacent light bars 10, and improve the light emitting uniformity of the diffusion plate 20.

Referring to fig. 1, a plurality of first reflective sheets 31 and a plurality of second reflective sheets 32 may be further disposed on the bottom plate 41, where the plurality of first reflective sheets 31 are respectively disposed in the spaced areas between the plurality of light bars 10, and the second reflective sheets 32 cover the side plates 42 and the area of the bottom plate 41 between the connection portion of the side plates 42 and the bottom plate 41 and the outermost light bar 10.

Referring to fig. 13 to 16, fig. 13 is a sixth structural schematic diagram of a backlight module provided in an embodiment of the present application, fig. 14 is a seventh structural schematic diagram of a backlight module provided in an embodiment of the present application, fig. 15 is a eighth structural schematic diagram of a backlight module provided in an embodiment of the present application, and fig. 16 is a ninth structural schematic diagram of a backlight module provided in an embodiment of the present application. The first reflection sheet 31 may include a first arc portion protruding toward a direction away from the bottom plate 41; the second reflection sheet 32 may include a second arc portion protruding toward a direction approaching the bottom plate 41.

It can be understood that, when the first reflective sheet 31 includes the first arc portion and the first arc portion protrudes toward a direction away from the bottom plate 41, since the outgoing angles of the reflected light formed by different areas of the first arc portion surface are different when the incident light of the same angle irradiates the first arc portion surface, that is, the outgoing angles of the light reflected by the first reflective sheet 31 having the first arc portion are more than those of the planar first reflective sheet 31, so that the outgoing light of the backlight module 100 can be more uniform.

It can be appreciated that, compared with the technical solution that the second reflective sheet 32 may also include a horizontal portion attached to the bottom plate 41 and a side portion attached to the side plate 42, when the second reflective sheet 32 includes a second arc portion, the second arc portion protrudes toward a direction close to the bottom plate 41, since angles of outgoing light formed after reflection of light rays with the same incident angle by different areas on the second arc portion are different, it is more beneficial to increase the outgoing angle of light rays reflected from the second reflective sheet 32, and further the outgoing light of the backlight module 100 is more uniform.

The first arc portion may be an entire area of the first reflective sheet 31 (as shown in fig. 13 and 14), or may be a partial area of the first reflective sheet 31 (as shown in fig. 15 and 16). Referring to fig. 15 and 16, when the first arc portion is a partial region of the first reflection sheet 31, the first reflection sheet 31 may include the first arc portion and planar portions located at both sides of the first arc portion.

The second arc portion may be a partial region or an entire region of the second reflection sheet 32 (as shown in fig. 13 to 16), and when the second arc portion is a partial region of the second reflection sheet 32, the second reflection sheet 32 may include the second arc portion and planar portions located at both sides of the second arc portion.

It can be understood that, when the first reflective sheet 31 has the first arc portion and/or the second reflective sheet 32 has the second arc portion, the first reflective sheet 31 and/or the second reflective sheet 32 can reflect the light emitted from the light emitting devices 11 on the light bar 10, so that the light emitted from the light source is more uniform, and therefore, when the light bar 10 is designed, the length of the interval area between the adjacent light emitting devices 11 can be properly enlarged, thereby reducing the number of the light emitting devices 11 mounted on the light bar 10 and further saving the production cost.

Illustratively, the first reflective sheet 31 having the first arc portion and the second reflective sheet 32 having the second arc portion may be manufactured by a plastic suction process, and the first reflective sheet 31 and the second reflective sheet 32 may be automatically assembled, thereby saving the cost of product assembly.

Referring to fig. 17, fig. 17 is a schematic view of a tenth structure of a backlight module according to an embodiment of the disclosure. The second reflection sheet 32 may also include a horizontal portion attached to the bottom plate 41 and a side portion attached to the side plate 42.

Referring to fig. 1 and fig. 9 to 17, the backlight module 100 may further include an optical film 30, where the optical film 30 is disposed on a side of the diffusion plate 20 facing away from the light source.

Illustratively, the optical film 30 may include one or more of a brightness enhancing film, a diffusion film.

The backlight module 100 provided in any embodiment of the application can realize an OD value of 20 mm-25 mm (the light mixing distance from the surface of the light incident surface of the diffusion plate 20 to the surface of the reflecting sheet), and compared with the existing backlight module with an OD value of 30 mm-35 mm, the OD value of the backlight module 100 is greatly reduced, namely, the thickness of the backlight module 100 is reduced, so that the light and thin design of the display device is facilitated. In addition, compared with the existing backlight module with the OD value of 30-35 mm, the backlight module 100 of the embodiment of the application has no increase in production cost, and therefore has higher cost performance.

The embodiment of the application further provides a display device, including the backlight module 100 in any of the embodiments.

It is understood that the display device may further include a display panel, and the backlight module 100 is disposed on the light incident side of the display panel.

The display device may be a liquid crystal display device, and the display panel may be a liquid crystal display panel, for example.

In terms of practical products, the display device may be a television, a computer display, a mobile phone, a tablet computer, a wearable device, etc., wherein the wearable device may be a smart bracelet, smart glasses, a smart watch, a smart decoration, etc.

The backlight module and the display device provided by the embodiment of the application are described in detail above. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, with the description of the examples given above only to assist in understanding the present application. Meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A backlight module, comprising:

the light source comprises a plurality of light emitting devices, wherein each light emitting device comprises a light emitting element and a primary lens, and the primary lens is coated on the outer surface of the light emitting element;

the surface of the primary lens, which is away from one side of the light-emitting element, is provided with a plurality of first microstructures, the primary lens comprises a plurality of first light-transmitting film layers which are stacked, and the refractive indexes of the plurality of first light-transmitting film layers gradually decrease in the direction from one side of the primary lens, which faces the light-emitting element, to one side of the primary lens, which is away from the light-emitting element, and the junction surface between any two adjacent first light-transmitting film layers is a bending surface;

the light-emitting device further comprises a secondary lens, wherein the secondary lens is arranged on one side, away from the light-emitting element, of the primary lens, and a space is arranged between the secondary lens and the primary lens; the secondary lens comprises a plurality of second light-transmitting film layers which are arranged in a laminated mode, the refractive indexes of the second light-transmitting film layers are different, and the joint surfaces between any two adjacent second light-transmitting film layers are all planes.

2. A backlight module according to claim 1, wherein the surface of the secondary lens facing away from the primary lens is provided with a plurality of second microstructures.

3. A backlight module according to claim 2, wherein the refractive indices of the plurality of second light-transmitting film layers gradually decrease or gradually increase in a direction from a side of the secondary lens facing the primary lens to a side of the secondary lens facing away from the primary lens.

4. The backlight module according to claim 1, further comprising a diffusion plate disposed on a light-emitting side of the light source, the diffusion plate comprising a plurality of diffusion layers stacked, wherein refractive indexes of the diffusion layers are different from each other; and/or

A plurality of third microstructures are arranged on the surface of one side, away from the light source, of the diffusion plate; and/or

The diffusion plate contains a plurality of bubbles therein.

5. A backlight module according to claim 4, wherein the refractive index of the plurality of diffusion layers gradually decreases or gradually increases in a direction from a side of the diffusion plate facing the light source to a side of the diffusion plate facing away from the light source.

6. The backlight module according to claim 1, further comprising a back plate, the back plate comprising a bottom plate and a plurality of side plates connected to the bottom plate;

the light source comprises a plurality of light bars which are arranged at intervals, and the light bars are arranged on the bottom plate;

the light bar comprises a circuit board and a plurality of light emitting devices which are arranged on the circuit board and are arranged at intervals in sequence.

7. The backlight module according to claim 6, wherein the bottom plate is further provided with a plurality of first reflective sheets and a plurality of second reflective sheets, the plurality of first reflective sheets are respectively disposed in the interval regions between the plurality of light bars, and the second reflective sheets cover the side plates and the regions of the bottom plate between the connection portions of the side plates and the bottom plate and the outermost light bars.

8. The backlight module according to claim 7, wherein the first reflection sheet includes a first arc portion protruding toward a direction away from the bottom plate; and/or

The second reflecting sheet comprises a second arc-shaped part, and the second arc-shaped part protrudes towards the direction close to the bottom plate.

9. The backlight module according to claim 6, further comprising a diffusion plate, wherein the diffusion plate is disposed on a light emitting side of the light source, the diffusion plate comprises a plurality of arc structures sequentially connected, the plurality of arc structures are disposed corresponding to the plurality of light bars, and the arc structures protrude toward a direction away from the bottom plate; or alternatively

The diffusion plate comprises a plurality of main body parts which are sequentially arranged, a waist is arranged between any two adjacent main body parts, the waist is connected with the two adjacent main body parts, the thickness of the main body parts is larger than that of the waist, the waist corresponds to the lamp strip, and a groove is formed in one side of the waist, which faces the lamp strip.

10. A display device comprising a backlight module according to any one of claims 1-9.