Backlight module and display device

Abstract

The embodiment of the utility model provides a backlight module and a display device, relates to the technical field of display, and aims to solve the problem that different light source groups interfere with one another in the light emitting process in the related technology. The backlight module comprises a back plate, a plurality of light source groups and a packaging layer, the plurality of light source groups are arranged on the back plate, and each light source group comprises at least one light source; the packaging layer is arranged on the back plate and one side, far away from the back plate, of the light source group; wherein the surface of one side, far away from the back plate, of the packaging layer is provided with at least one groove, the groove is located between the two adjacent light source groups, and the refractive index of a medium in the groove is smaller than that of the packaging layer.

Description

Technical Field

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

[0002] Mini LED (Mini Light Emitting Diode) display devices are increasingly popular among consumers due to their advantages such as high efficiency, high brightness and fast response.

[0003] The Mini LED display device includes a backlight module, which includes a backplane, multiple light sources, and an encapsulation layer that encapsulates the multiple light sources on the backplane. The multiple light sources are usually divided into multiple light source groups, and different light source groups can be controlled separately to display different brightness. At present, the luminous brightness of a light source group in the backlight module will be affected by the light from the adjacent light source group, resulting in a deterioration in the light output effect of the backlight module, which in turn causes the problem of poor display effect of the Mini LED display device. Utility Model Content

[0004] The embodiments of the present application provide a backlight module and a display device, which are used to improve the problem that the light luminance of a light source group in the backlight module is easily affected by light from an adjacent light source group.

[0005] On the one hand, an embodiment of the present application provides a backlight module, which includes: a backplane, a plurality of light source groups, and an encapsulation layer. The plurality of light source groups are arranged on the backplane, each light source group includes at least one light source; the encapsulation layer is arranged on the backplane and on a side of the light source group away from the backplane; wherein at least one groove is provided on a surface of the encapsulation layer away from the backplane, the groove is located between two adjacent light source groups, and the refractive index of the medium in the groove is less than the refractive index of the encapsulation layer.

[0006] In some embodiments, the plurality of light source groups are distributed in an array, and the plurality of light source groups include a first light source group, a second light source group arranged adjacent to the first light source group along a first direction, and a third light source group arranged adjacent to the first light source group along a second direction, and at least one of the grooves includes a first groove and a second groove, the first groove is located between the first light source group and the second light source group, the second groove is located between the first light source group and the third light source group, and the first groove and the second groove are connected to each other.

[0007] In some embodiments, the backlight module has a plurality of light source areas, a plurality of the light source groups are located in one of the light source areas, and the at least one groove is located between two adjacent light source areas.

[0008] In some embodiments, one groove is provided between every two adjacent light source groups.

[0009] In some embodiments, the distances between two adjacent light source groups and the opening of the groove are equal, and the minimum distances between two adjacent light source groups and the bottom of the groove are equal.

[0010] In some embodiments, an area of ​​the opening of the groove is larger than an area of ​​the bottom of the groove.

[0011] In some embodiments, the distance between the bottom of the groove and the back plate is less than or equal to the height of the light source.

[0012] In some embodiments, the groove is further filled with an optically transparent adhesive, and the refractive index of the optically transparent adhesive is smaller than the refractive index of the packaging layer.

[0013] In some embodiments, the refractive index of the optically transparent adhesive is 1.3, and the refractive index of the encapsulation layer is greater than or equal to 1.5 and less than or equal to 1.6.

[0014] On the other hand, an embodiment of the present application further provides a display device, which includes a backlight module as described in any of the above embodiments.

[0015] For the backlight module provided by the embodiment of the present application, since a groove is provided on the encapsulation layer, and the refractive index of the medium in the groove is relatively small, when the light emitted by the light source passes through the side wall of the encapsulation layer in the groove, a part of the light will be totally reflected and reflected back to the light source group where the light source is located, thereby avoiding that the part of the light affects the luminous brightness of another adjacent light source group separated from the groove; another part of the light will be refracted and deflected toward the side of the light source group where the light source is located, so that the interference of the part of the light on the luminous brightness of the above-mentioned adjacent light source group can be alleviated. This is conducive to improving the interference of the luminous brightness of the light source group by the adjacent light source group, thereby ensuring that the backlight module has a good luminous effect, and then can improve the display effect of the display device using the backlight module. In addition, the light sources in different light source groups are separated by the groove, which is also conducive to alleviating the problem of shadows between adjacent light sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural diagram of a backlight module provided in some embodiments of the present application;

[0017] Figure 2 yes Figure 1 A cross-sectional view of the backlight module along the AA' direction;

[0018] Figure 3is a structural diagram of a backlight module provided in some other embodiments of the present application;

[0019] Figure 4 is a structural diagram of a backlight module provided in some embodiments of the present application;

[0020] Figure 5 This is a structural diagram of a display device provided in some embodiments of the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0022] In the description of this application, it should be understood that the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0023] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0024] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present application.

[0025] The various embodiments of the present application are similar, and features in different embodiments and / or different examples may be combined with each other.

[0026] In the related art, a backlight module is usually provided with multiple light source groups, and different light source groups can be controlled separately to display different brightness. However, different light source groups will interfere with each other during the light emission process, affecting the light emission effect of the backlight module, thereby causing the problem of poor display effect of the Mini LED display device using the backlight module.

[0027] Based on this, some embodiments of the present application provide a backlight module, such as Figure 1 and Figure 2 As shown, the backlight module 100 includes a back plate 10 , a plurality of light source groups 20 and a packaging layer 30 .

[0028] A plurality of light source groups 20 are disposed on the back plate 10 , and each light source group 20 includes at least one light source 201 .

[0029] In some examples, the backplane 10 may include a driving circuit layer, in which a driving circuit electrically connected to the light source 201 is provided, so as to drive the corresponding light source 201 to emit light. In other examples, a flexible circuit board may be provided on the backplane 10, and the light source 201 is electrically connected to the flexible circuit board. The flexible circuit board may be bonded to the backplane 10, so as to complete the fixing of the flexible circuit board and the light source 201. The embodiments of the present application are not limited thereto, as long as the light emission of the driving light source 201 can be achieved.

[0030] The light source 201 may be, for example, a Mini LED (Mini Light Emitting Diode) or a Micro LED (Micro Light Emitting Diode).

[0031] The encapsulation layer 30 is disposed on the back plate 10 and on the side of all the light source groups 20 away from the back plate 10, so that all the light sources 201 can be encapsulated and protected to prevent the light sources 201 from being affected by the external environment, thereby extending the service life of the light sources 201. It is worth noting that the material of the encapsulation layer 30 should be a light-transmitting material to ensure that the light emitted by the light source 201 is effectively emitted from the encapsulation layer 30.

[0032] The surface of the packaging layer 30 away from the back plate 10 is provided with at least one groove 31 . The groove 31 is located between two adjacent light source groups 20 , and the refractive index of the medium in the groove 31 is smaller than that of the packaging layer 30 .

[0033] It should be noted that the position of the groove 31 between two adjacent light source groups 20 means that the orthographic projection of the opening boundary of the groove 31 on the back plate 10 is located between the orthographic projections of the two adjacent light source groups 20 on the back plate 10 .

[0034] Exemplarily, the medium in the groove 31 can be air, in which case the material of the encapsulation layer 30 needs to be a transparent material with a refractive index greater than that of air. Of course, the medium in the groove 31 can also be other solid, liquid or gaseous substances, which are not limited in the embodiments of the present application.

[0035] Since the packaging layer 30 is provided with a groove 31, and the refractive index of the medium in the groove 31 is relatively small, the light emitted by the light source 201 passes through the side wall of the packaging layer 30 in the groove 31. Figure 2As shown, part of the light will be totally reflected and reflected back to the light source group 20 where the light source 201 is located, thereby preventing the part of the light from affecting the luminous brightness of another adjacent light source group 20 separated from the groove 31; another part of the light will be refracted and deflected toward the side of the light source group 20 where the light source 201 is located, which can alleviate the interference of the part of the light on the luminous brightness of the above-mentioned other adjacent light source group 20. This is conducive to improving the interference of the luminous brightness of the light source group 20 by the adjacent light source group 20, thereby ensuring that the backlight module 100 has a good luminous effect, and further improving the display effect of the display device using the backlight module 100. In addition, the light sources 201 in different light source groups 20 are separated by the groove 31, which is also conducive to alleviating the problem of shadows between adjacent light sources 201.

[0036] In some embodiments, Figure 1 As shown, along the arrangement direction perpendicular to two adjacent light source groups 20 , the size L1 of the groove 31 is greater than or equal to the maximum size L2 of a light source group 20 adjacent to the groove 31 .

[0037] Wherein, in the case that each of the above light source groups 20 includes one light source 201, the maximum size of the light source group 20 in the direction perpendicular to the arrangement of two adjacent light source groups 20 refers to the distance between two opposite sides of the light source 201 in the direction perpendicular to the arrangement of two adjacent light source groups 20, that is, the size of the light source 201 in the direction perpendicular to the arrangement of two adjacent light source groups 20. In the case that each of the above light source groups 20 includes a plurality of light sources 201, the maximum size of the light source group 20 in the direction perpendicular to the arrangement of two adjacent light source groups 20 refers to the distance between the outermost surfaces of the light sources 201 located at opposite ends of the light source group 20 in the direction perpendicular to the arrangement of two adjacent light source groups 20.

[0038] This arrangement allows the grooves 31 to be spaced apart in the areas facing each other between two adjacent light source groups 20 , which helps to improve the light regulation effect of the grooves 31 on the light between the light source groups 20 , thereby further alleviating light interference between adjacent light source groups 20 and further improving the luminous effect of the backlight module 100 .

[0039] In some embodiments, Figure 1 As shown, a groove 31 is provided between every two adjacent light source groups 20 .

[0040] In this case, there is a gap of the groove 31 between any two adjacent light source groups 20 in the backlight module 100 , which can effectively alleviate the light interference between adjacent light source groups 20 in the backlight module 100 , thereby improving the lighting effect of the backlight module 100 .

[0041] It is worth noting that the grooves 31 in the backlight module 100 may be interconnected or not, as long as one groove 31 is provided between every two adjacent light source groups 20 .

[0042] In some embodiments, Figure 1 As shown, the plurality of light source groups 20 are distributed in an array, and the plurality of light source groups 20 include a first light source group 21, a second light source group 22 disposed adjacent to the first light source group 21 along a first direction X, and a third light source group 23 disposed adjacent to the first light source group 21 along a second direction Y, and the second direction Y is perpendicular to the first direction X. At least one groove 31 (i.e., all grooves 31 provided on the encapsulation layer 30) includes a first groove 301 and a second groove 302, the first groove 301 is located between the first light source group 21 and the second light source group 22, the second groove 302 is located between the first light source group 21 and the third light source group 23, and the first groove 301 and the second groove 302 are connected to each other.

[0043] In some examples, such as Figure 1 As shown, the plurality of light source groups 20 further include a fourth light source group 24 disposed adjacent to both the second light source group 22 and the third light source group 23 , and the fourth light source group 24 and the first light source group 21 may be arranged diagonally.

[0044] Since the first groove 301 and the second groove 302 are interconnected, the grooves can partially surround the first light source group 21, so that the first light source group 21 and the fourth light source group 24 are separated from each other, which is conducive to alleviating the light interference between the first light source group 21 and the fourth light source group 24, thereby further ensuring that the first light source group 21 has an independent and good light emitting effect, and further ensuring the good light emitting effect of the backlight module 100.

[0045] In some examples, the second groove 302 may extend along its length, and the first groove 301 may extend along its length, so that the two intersect and communicate with each other. In this case, the angle between the first groove 301 and the second groove 302 is a right angle.

[0046] In other examples, a connecting groove is further provided between the first groove 301 and the second groove 302, and both ends of the connecting groove are respectively connected to the first groove 301 and the second groove 302. The connecting groove can be arranged in an arc shape or in other shapes, as long as the connection between the first groove 301 and the second groove 302 can be achieved.

[0047] In some embodiments, Figure 3 As shown, the backlight module 100 has a plurality of light source areas 101 , a plurality of light source groups 20 are located in one light source area 101 , and at least one groove 31 is located between two adjacent light source areas 101 .

[0048] By setting at least one groove 31 between two adjacent light source areas 101, the interference of the luminous brightness of the light source area 101 by the adjacent light source area 101 can be improved, thereby ensuring that the backlight module 100 has a good luminous effect, and further improving the display effect of the display device using the backlight module 100.

[0049] In some examples, a plurality of interconnected grooves 31 are disposed between two adjacent light source areas 101. This can further improve the problem that the luminous brightness of a light source area 101 is disturbed by the adjacent light source area 101, thereby ensuring that the backlight module 100 has an excellent luminous effect.

[0050] In some examples, the plurality of light source groups 20 in each light source area 101 may be arranged along the first direction X, and the plurality of grooves 31 between two adjacent light source areas 101 are also arranged along the first direction X. The plurality of grooves 31 may extend along their length direction and be interconnected. Figure 3 It is only shown that each light source area 101 includes three light source groups 20, and the three grooves 31 between two adjacent light source areas 101 can be interconnected. The embodiment of the present application does not limit the number and arrangement direction of the light source groups 20 in each light source area 101.

[0051] In some examples, the multiple light source groups 20 in each light source area 101 can be driven synchronously, so that the zone brightness of the backlight module 100 can be controlled by independently driving different light source areas 101 .

[0052] In some examples, the plurality of light source regions 101 may be distributed in an array.

[0053] In some embodiments, Figure 1 As shown, at least one groove 31 (ie, all grooves 31 opened on the encapsulation layer 30) includes a plurality of mutually connected grooves 31. In this case, at least some of the grooves 31 in all the grooves 31 are mutually connected.

[0054] With such arrangement, the groove 31 can partially or completely surround the corresponding light source group 20 , so that the light source group 20 can be effectively isolated, thereby ensuring that it has an independent and excellent light emitting effect.

[0055] In some examples, the plurality of light source groups 20 may be arranged in an array in the following manner: the plurality of light source groups 20 include n light source groups 20 arranged along a first direction X and m light source groups 20 arranged along a second direction Y, that is, the plurality of light source groups 20 are arranged in n rows and m columns.

[0056] For the first light source group 20 and the m-th light source group 20 located in the first row, and the first light source group 20 and the m-th light source group 20 located in the n-th row (i.e., for the light source groups 20 located in the four corners), the grooves 31 may be provided on both sides of each light source group 20. For the other light source groups 20 located in the first row, the n-th row, the first column, and the m-th column, the grooves 31 may be provided on three sides of each light source group 20. For the light source groups 20 located in the middle, the grooves 31 may be provided on the four sides of each light source group 20.

[0057] In this case, each light source group 20 can be effectively isolated from the light source groups 20 located around it through the groove 31, thereby ensuring that the backlight module 100 has an excellent light emitting effect.

[0058] In some embodiments, Figure 1 As shown, a groove 31 is provided between any two adjacent light source groups 20 , and a plurality of grooves 31 (ie, all grooves 31 provided on the packaging layer 30 ) are interconnected.

[0059] With such arrangement, any light source group 20 is isolated from the adjacent light source groups 20 and the light source groups 20 arranged diagonally, thus ensuring that the backlight module 100 has an excellent light emitting effect.

[0060] In some embodiments, Figure 2 As shown, the distance D1 between two adjacent light source groups 20 and the opening 311 of the groove 31 therebetween is equal, and the distance D2 between two adjacent light source groups 20 and the bottom 312 of the groove 31 therebetween is equal.

[0061] In this case, the distances from two adjacent light source groups 20 to the groove 31 located between the two are equal, which helps to ensure that even if there is some light crosstalk between the two adjacent light source groups 20, the light has the same effect on the two light source groups 20. This helps to improve the light uniformity of the backlight module 100, thereby improving the light output effect of the backlight module 100.

[0062] It is worth noting that the spacing between A and B refers to the minimum distance between A and B.

[0063] In some examples, two adjacent light source groups 20 are mirror-symmetrical about a symmetry axis, and for the groove 31 located between the two adjacent light source groups 20 , the sidewall 313 of the encapsulation layer 30 in the groove 31 is mirror-symmetrical about the symmetry axis.

[0064] Such an arrangement is beneficial to further improve the light emitting uniformity of the backlight module 100 , thereby ensuring the light emitting effect of the backlight module 100 .

[0065] In some embodiments, Figure 2 As shown, the area of ​​the opening 311 of the groove 31 is larger than the area of ​​the bottom 312 of the groove 31. In this case, when the light source 201 in the light source group 20 adjacent to the groove 31 emits light, the light is easily reflected when passing through the side wall 313 in the groove 31, which is conducive to reducing the proportion of light refraction when passing through the side wall 313, thereby improving the light output effect of each light source group 20. In addition, the groove 31 is designed as the above structure, which is also conducive to the opening of the groove 31.

[0066] In some embodiments, Figure 2 As shown, the side wall 313 of the packaging layer 30 located in the groove 31 includes at least one of a curved surface and a flat surface.

[0067] In some examples, the side wall 313 may include a curved surface, so that the curvature of the side wall 313 at different positions can be adjusted to increase the proportion of light reflected when passing through the side wall 313 , thereby further improving the light emitting effect of each light source group 20 .

[0068] Exemplarily, the two opposite side walls 313 in the groove 31 are both parts of an elliptical arc surface. For example, the cross section of the groove 31 along the thickness direction of the back plate 10 can be half of an elliptical edge.

[0069] In some examples, the sidewall 313 may include a flat surface, which facilitates the fabrication of the groove 31 .

[0070] Exemplarily, the two opposite side walls 313 in the groove 31 are both planes, and the two ends of each side wall 313 are respectively connected to the opening and the bottom of the groove 31. The two planes are arranged obliquely relative to the thickness direction of the back plate 10, and the cross section of the groove 31 along the thickness direction of the back plate 10 can be, for example, triangular or other shapes.

[0071] In some embodiments, Figure 2 As shown, the distance D3 between the bottom of the groove 31 and the back plate 10 is less than or equal to the height D4 of the light source 201. This arrangement can increase the adjustment area of ​​the side wall 313 in the groove 31 for the light source 201, thereby improving the light output effect of each light source group 20, and further improving the light output effect of the backlight module 100.

[0072] In some examples, a distance D3 between the bottom of the groove 31 and the back plate 10 may be equal to a height D4 of the light source 201 .

[0073] In some other examples, the distance D3 between the bottom of the groove 31 and the back plate 10 may be smaller than the height D4 of the light source 201 .

[0074] In this way, in the process of making the groove 31, the depth of the groove 31 can be determined according to actual needs while determining the thickness of the packaging layer 30 and the height D4 of the light source 201, thereby ensuring that the distance D3 between the bottom of the groove 31 and the back plate 10 is less than or equal to the height D4 of the light source 201, which is beneficial to improving the light output effect of the backlight module 100.

[0075] In addition, the width of the groove 31 can be flexibly set as needed, as long as the groove 31 is located between two corresponding light source groups 20 .

[0076] In some embodiments, Figure 4 As shown, the groove 31 is also filled with an optically transparent adhesive 40 , and the refractive index of the optically transparent adhesive 40 is smaller than the refractive index of the packaging layer 30 .

[0077] By filling the optically transparent glue 40, it helps to improve the structural stability of the packaging layer 30, and it also helps to prevent the outside air from easily passing through the portion of the packaging layer 30 around the groove 31 due to the setting of the groove 31 and contacting the light source 201 and causing adverse effects on the light source 201, thereby further ensuring the working stability of the light source 201.

[0078] In some embodiments, the refractive index of the encapsulation layer 30 is greater than or equal to 1.5 and less than or equal to 1.6. In this case, the refractive index of the optically transparent adhesive 40 needs to be less than 1.5. Exemplarily, the refractive index of the encapsulation layer 30 can be 1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59 or 1.6, etc. The refractive index of the optically transparent adhesive 40 can be 1.4, 1.35, 1.3 or 1.25, etc.

[0079] In some examples, the encapsulation layer 30 may be made of a UV curable adhesive having a refractive index in the range of 1.5 to 1.6.

[0080] In some examples, the optically transparent adhesive 40 may be an ultraviolet curing adhesive with a refractive index of 1.3. The ultraviolet curing adhesive has the advantages of being safe, pollution-free, and having a fast curing speed, which is beneficial to ensuring the safety, environmental protection, and production efficiency of the backlight module.

[0081] Some embodiments of the present application also provide a display device, such as Figure 5 As shown, the display device 200 includes the backlight module 100 described in any one of the above embodiments.

[0082] Since the display device 200 includes the backlight module 100 , it has all the technical effects of the backlight module 100 , which will not be described in detail here.

[0083] In some examples, the display device 200 further includes an optical film layer 300 located on the light-emitting side of the backlight module 100 , and the optical film layer 300 includes at least one of a light-homogenizing film, a quantum dot film, a diffuser, and a brightness-enhancing film.

[0084] For example, the optical film layer 300 may include a light homogenizing film, a quantum dot film, and a diffusion film which are sequentially arranged in a direction away from the backlight module 100 .

[0085] By providing the optical film layer 300 , the light emitted by the display device 200 can be effectively modulated, thereby improving the light emitting effect of the display device 200 .

[0086] In some examples, the display device 200 further includes a liquid crystal display panel, which is located on the light emitting side of the backlight module 100 .

[0087] In some examples, the display device 200 may further include an upper polarizer and a lower polarizer, etc., to help improve the display effect of the display device.

[0088] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A backlight module, characterized in that: include: Back panel; A plurality of light source groups are arranged on the back plate, each light source group comprising at least one light source; as well as An encapsulation layer, disposed on the back plate and on a side of the light source group away from the back plate; Wherein, at least one groove is formed on a surface of the packaging layer away from the back plate, the groove is located between two adjacent light source groups, and the refractive index of the medium in the groove is smaller than the refractive index of the packaging layer.

2. The backlight module according to claim 1, characterized in that: The multiple light source groups are distributed in an array, and the multiple light source groups include a first light source group, a second light source group arranged adjacent to the first light source group along a first direction, and a third light source group arranged adjacent to the first light source group along a second direction. At least one of the grooves includes a first groove and a second groove, the first groove is located between the first light source group and the second light source group, the second groove is located between the first light source group and the third light source group, and the first groove and the second groove are connected to each other.

3. The backlight module according to claim 1, characterized in that: The backlight module has a plurality of light source areas, a plurality of light source groups are located in one of the light source areas, and the at least one groove is located between two adjacent light source areas.

4. The backlight module according to claim 1, characterized in that: One groove is provided between every two adjacent light source groups.

5. The backlight module according to any one of claims 1 to 4, characterized in that: The distances between two adjacent light source groups and the opening of the groove are equal, and the distances between two adjacent light source groups and the bottom of the groove are equal.

6. The backlight module according to any one of claims 1 to 4, characterized in that: The area of ​​the opening of the groove is larger than the area of ​​the bottom of the groove.

7. The backlight module according to claim 6, characterized in that: The distance between the bottom of the groove and the back plate is less than or equal to the height of the light source.

8. The backlight module according to any one of claims 1 to 4, characterized in that: The groove is also filled with optically transparent glue, and the refractive index of the optically transparent glue is smaller than the refractive index of the packaging layer.

9. The backlight module according to claim 8, characterized in that: The refractive index of the optically transparent adhesive is 1.3, and the refractive index of the encapsulation layer is greater than or equal to 1.5 and less than or equal to 1.

6.

10. A display device, characterized in that: include: A backlight module as claimed in any one of claims 1 to 9.

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