Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device. Wherein a plurality of first prisms are arranged on one surface, far away from the second prismatic lens, of the first prismatic lens, and a plurality of second prisms are arranged on one surface, close to the first prismatic lens, of the second prismatic lens; the plurality of first prisms extend along a first direction and are arranged along a second direction, the first direction and the second direction intersect, and the first direction and the second direction are both parallel to the first prismatic lens; the plurality of second prisms extend along a third direction and are arranged along a fourth direction, the third direction intersects with the fourth direction, and the third direction and the fourth direction are both parallel to the second prismatic lens; the first direction is not perpendicular to the third direction, the included angle between the first direction and the fifth direction is smaller than that between the third direction and the fifth direction, the fifth direction is parallel to the long side of the first prismatic lens or the long side of the second prismatic lens, and the haze of the first prismatic lens is larger than 45%; according to the backlight module, the inverted image phenomenon of the first frame body can be improved, and the light emitting uniformity of the backlight module is improved.

Description

Technical Field

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

[0002] The liquid crystal panel, optical film layer and backlight in the liquid crystal display are usually assembled and fixed using a plastic frame. In order to achieve stable fixation, there must be a sufficient overlap length between the plastic frame and the optical film layer to provide sufficient support in the horizontal and vertical directions.

[0003] At present, the prism sheet is often placed above the diffuser to improve the light output efficiency. However, reflections are easily generated at the edge of the prism sheet. For example, when light is reflected from the plastic frame to the prism sheet, the plastic frame reflection is easily generated, which seriously affects the light output uniformity and display effect. Utility Model Content

[0004] The embodiments of the utility model provide a backlight module and a display device, which can improve the reflection phenomenon and enhance the uniformity of light output.

[0005] The present invention provides a backlight module, which includes:

[0006] An optical film set, comprising a first prism sheet and a second prism sheet which are stacked, wherein a surface of the first prism sheet away from the second prism sheet is provided with a plurality of first prisms, and a surface of the second prism sheet close to the first prism sheet is provided with a plurality of second prisms;

[0007] A plurality of the first prisms extend along a first direction and are arranged along a second direction, the first direction and the second direction intersect, and the first direction and the second direction are both parallel to the first prism sheet;

[0008] A plurality of the second prisms extend along a third direction and are arranged along a fourth direction, the third direction intersects the fourth direction, and the third direction and the fourth direction are both parallel to the second prism sheet;

[0009] Among them, the first direction is not perpendicular to the third direction, the angle between the first direction and the fifth direction is smaller than the angle between the third direction and the fifth direction, and the fifth direction is parallel to the long side of the first prism sheet or the long side of the second prism sheet, and the haze of the first prism sheet is greater than 45%.

[0010] In an embodiment of the present invention, the angle between the first direction and the third direction is greater than or equal to 20° and less than or equal to 50°.

[0011] In one embodiment of the present utility model, the angle between the first direction and the fifth direction is greater than or equal to 30° and less than or equal to 40°;

[0012] An angle between the third direction and the fifth direction is greater than or equal to 60° and less than or equal to 80°.

[0013] In an embodiment of the present invention, the long side of the first prism sheet is parallel to the long side of the second prism sheet.

[0014] In one embodiment of the present utility model, the backlight module further includes:

[0015] A first frame body is arranged around the optical film group, and the first frame body includes a fixing portion located on the optical film group near the light emitting side of the backlight module;

[0016] Among them, the optical film group includes a first area overlapping with the fixed part along the thickness direction of the optical film group, and a second area adjacent to the first area, the second area is located on a side of the first area close to the center of the optical film group, the first prism sheet is located on a side of the optical film group close to the fixed part, the first prism is located on a side of the first prism sheet close to the fixed part, and the vertex angle of the first prism located in the second area is greater than 90°.

[0017] In an embodiment of the present invention, an atomized coating is provided on a surface of the first prism sheet away from the fixing portion, and particles are doped in the atomized coating.

[0018] In an embodiment of the present invention, the second prism sheet is located on a side of the first prism sheet away from the fixing portion, and the optical film sheet assembly further includes a diffusion sheet disposed on a side of the second prism sheet away from the first prism sheet.

[0019] In an embodiment of the present invention, the width of the second region along the direction of the first region close to the second region is less than or equal to the thickness of the fixing portion.

[0020] In an embodiment of the present invention, the vertex angles of all the first prisms are greater than 90°.

[0021] In an embodiment of the present invention, the vertex angle of the first prism is less than or equal to 100°.

[0022] In an embodiment of the present invention, the vertex angle of the second prism is equal to 90°.

[0023] According to the above-mentioned purpose of the present invention, an embodiment of the present invention further provides a display device, which includes a display panel and the backlight module, and the display panel is arranged on the light emitting side of the backlight module.

[0024] The beneficial effects of the utility model are as follows: the utility model arranges a stacked first prism sheet and a second prism sheet in an optical film group, and the first prism sheet has a plurality of first prisms extending along a first direction and arranged along a second direction, and the second prism sheet has a plurality of second prisms extending along a third direction and arranged along a fourth direction, wherein the first direction is not perpendicular to the third direction, the angle between the first direction and the fifth direction is smaller than the angle between the third direction and the fifth direction, and the fifth direction is parallel to the long side of the first prism sheet or the long side of the second prism sheet; the utility model adjusts the extension direction of the first prism and the extension direction of the second prism so that they are no longer vertically arranged relative to the related art. It has been verified that the uniformity of light output of the backlight module can be effectively improved, and the phenomenon of uneven brightness caused by reflections at the edge of the optical film group can be improved; in addition, the utility model can effectively improve the diffusion and scattering effect of the first prism sheet on light by increasing the haze of the first prism sheet, improve the reflection phenomenon produced on the first prism sheet, and further improve the uniformity of light output of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0026] Figure 1 A structural schematic diagram of a backlight module provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the structure of a first prism sheet or a second prism sheet provided in an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of a planar structure of a first prism sheet provided in an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of a planar structure of a second prism sheet provided in an embodiment of the utility model;

[0030] Figure 5 Another structural schematic diagram of the first prism sheet provided in an embodiment of the utility model;

[0031] Figure 6 A schematic structural diagram of a first prism provided in an embodiment of the utility model;

[0032] Figure 7A schematic diagram of the structure of a second prism provided in an embodiment of the utility model;

[0033] Figure 8 A schematic diagram of the structure of a display device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0036] The utility model embodiment provides a backlight module, please refer to Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The backlight module includes an optical film group 10, which includes a first prism sheet 11 and a second prism sheet 12 that are stacked. A plurality of first prisms 111 are arranged on a surface of the first prism sheet 11 away from the second prism sheet 12, and a plurality of second prisms 121 are arranged on a surface of the second prism sheet 12 close to the first prism sheet 11.

[0037] A plurality of first prisms 111 extend along a first direction X1 and are arranged along a second direction X2, the first direction X1 and the second direction X2 intersect, and the first direction X1 and the second direction X2 are both parallel to the first prism sheet 11; a plurality of second prisms 121 extend along a third direction X3 and are arranged along a fourth direction X4, the third direction X3 intersects with the fourth direction X4, and the third direction X3 and the fourth direction X4 are both parallel to the second prism sheet 12.

[0038] Among them, the first direction X1 is not perpendicular to the third direction X3, the angle between the first direction X1 and the fifth direction X5 is smaller than the angle between the third direction X3 and the fifth direction X5, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 or the long side of the second prism sheet 12, and the haze of the first prism sheet 11 is greater than 45%.

[0039] In the implementation and application process, the embodiment of the utility model is provided with a stacked first prism sheet 11 and a second prism sheet 12 in the optical film sheet group 10, and the first prism sheet 11 has a plurality of first prisms 111 extending along the first direction X1 and arranged along the second direction X2, and the second prism sheet 12 has a plurality of second prisms 121 extending along the third direction X3 and arranged along the fourth direction X4, wherein the first direction X1 is not perpendicular to the third direction X3, the angle between the first direction X1 and the fifth direction X5 is smaller than the angle between the third direction X3 and the fifth direction X5, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 or the third direction X3. The long side of the prism sheet 12; in the embodiment of the utility model, the extension direction of the first prism 111 and the extension direction of the second prism 121 are adjusted so that they are no longer vertically arranged relative to the related art. It has been verified that the light uniformity of the backlight module can be effectively improved, and the brightness unevenness caused by the reflection at the edge of the optical film group 10 can be improved; in addition, the embodiment of the utility model can effectively improve the diffusion and scattering effect of the first prism sheet 11 on light by increasing the haze of the first prism sheet 11, improve the reflection phenomenon generated on the first prism sheet 11, and further improve the light uniformity of the backlight module.

[0040] Specifically, please continue to combine Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The backlight module provided by the embodiment of the utility model includes a first frame optical film group 10, a first frame 20, a light guide plate 31, a reflective sheet 32, a light source 33, and a second frame 34.

[0041] The second frame 34 forms a surrounding space, which has an opening on the light-emitting side of the backlight module, and the optical film group 10, the light guide plate 31, the reflective sheet 32, and the light source 33 are all located in the surrounding space, wherein the reflective sheet 32 ​​is arranged on the bottom plate of the second frame 34 and is arranged opposite to the opening, the light guide plate 31 is arranged on the side of the reflective sheet 32 ​​close to the opening, the optical film group 10 is arranged on the side of the light guide plate 31 close to the opening, and the light source 33 is arranged on the side of the light guide plate 31; in one embodiment, the light source 33 can be fixedly arranged on the side panel of the second frame 34, and the number of the light sources 33 is not limited to one, but can also be multiple.

[0042] It should be noted that in other embodiments of the present invention, the backlight module may also be a direct-down type, and the light source is disposed on a side of the optical film assembly 10 away from the light-emitting side of the backlight module.

[0043] The first frame 20 is arranged around the second frame 34, and the first frame 20 is arranged around the optical film group 10; further, the first frame 20 includes a fixing portion 21 extending to the light emitting side of the optical film group 10 close to the backlight module, and the fixing portion 21 has an overlapping portion with the optical film group 10 to fix the optical film group 10 and the light guide plate 31 and the reflective sheet 32.

[0044] Please combine Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In an embodiment of the utility model, the optical film group 10 includes a first prism sheet 11 and a second prism sheet 12 which are stacked, and the first prism sheet 11 includes a plurality of first prisms 111 extending along a first direction X1 and arranged along a second direction X2, the first direction X1 and the second direction X2 intersect, and the first direction X1 and the second direction X2 are both parallel to the first prism sheet 11; the second prism sheet 12 includes a plurality of second prisms 121 extending along a third direction X3 and arranged along a fourth direction X4, the third direction X3 intersects with the fourth direction X4, and the third direction X3 and the fourth direction X4 are both parallel to the second prism sheet 12.

[0045] Among them, the first prism sheet 11 is located on a side of the optical film group 10 close to the fixed part 21, and is located on the side of the optical film group 10 closest to the fixed part 21, that is, the second prism sheet 12 is located on a side of the first prism sheet 11 away from the fixed part 21; multiple first prisms 111 are located on a side of the first prism sheet 11 away from the second prism sheet 12, that is, on a side of the first prism sheet 11 close to the fixed part 21; multiple second prisms 121 are located on a side of the second prism sheet 12 close to the first prism sheet 11.

[0046] It should be noted that the optical film group 10 includes a first area 101 overlapping with the fixing portion 21 along the thickness direction of the optical film group 10 and a second area 102 adjacent to the first area 101, and the second area 102 is located on the side of the first area 101 close to the center 101 of the optical film group 10, and the optical film group 10 includes a first prism sheet 11 close to the side of the fixing portion 21; therefore, when the light emitted by the light source 33 passes through the light guide plate 31, the light will be emitted along the direction of the light guide plate 31 close to the optical film group 10, and when part of the light is irradiated to the side of the fixing portion 21, the part of the light may be reflected on the first prism sheet 11 in the second area 102, thereby forming a reflection in the second area 102, thereby affecting the final display effect.

[0047] In the embodiment of the utility model, the haze of the first prism sheet 11 is greater than 45%, that is, the embodiment of the utility model can increase the haze of the first prism sheet 11 to improve the diffusion and scattering effect of the first prism sheet 11 on light, thereby effectively improving the reflection phenomenon in the optical film group 10 and improving the light uniformity of the backlight module.

[0048] In one embodiment, the haze of the first prism sheet 11 is less than or equal to 98%; for example, the haze of the first prism sheet 11 can be 45.5%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%. , 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, or 98%, etc., and are not limited to the above values.

[0049] More preferably, the haze of the first prism sheet 11 is greater than 45% and less than or equal to 60%; thereby, on the basis of improving the reflection phenomenon of the plastic frame, the light output efficiency and brightness of the backlight module can be guaranteed.

[0050] In one embodiment, please combine Figure 1 as well as Figure 5 A mist coating 112 is provided on the surface of the first prism sheet 11 away from the fixing portion 21, wherein the mist coating 112 may be doped with particles, which may be scattering particles, such as silica particles, organic resin particles, etc., to further scatter and diffuse the light reflected from the fixing portion 21 to the first prism sheet 11, thereby improving the reflection phenomenon and improving the light uniformity of the backlight module.

[0051] Furthermore, in the embodiment of the utility model, the extension directions of the first prism 111 and the second prism 121 are designed to improve the phenomenon of uneven brightness of the light emitted by the backlight module.

[0052] In an embodiment of the utility model, the first direction X1 is not perpendicular to the third direction X3, the angle between the first direction X1 and the fifth direction X5 is smaller than the angle between the third direction X3 and the fifth direction X5, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 or the long side of the second prism sheet 12.

[0053] In one embodiment, the long side of the first prism sheet 11 is parallel to the long side of the second prism sheet 12 .

[0054] In one embodiment, the first direction X1 is perpendicular to the second direction X2, and the third direction X3 is perpendicular to the fourth direction X4.

[0055] In the embodiment of the utility model, verification is performed on the first direction X1 and the third direction X3 at different angles, wherein the embodiment of the utility model provides comparative example 1 and embodiments 1 to eleven. In comparative example 1 and embodiments 1 to eleven, the structure of the backlight module is the same, and the backlight module includes two stacked prism sheets and a diffusion sheet located under the two prism sheets. The difference is that the extension directions of the prisms in the two prism sheets are different.

[0056] In comparative example 1, the prism extension directions of the first prism sheet 11 and the second prism sheet 12 are perpendicular, that is, the angle between the first direction X1 and the fifth direction X5 is 0°, and the angle between the third direction X3 and the fifth direction X5 is 90°, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 and parallel to the long side of the second prism sheet 12.

[0057] In the first to eleventh embodiments, the prism extension directions of the first prism sheet 11 and the second prism sheet 12 are not perpendicular, and intersect at a certain angle.

[0058] Specifically, in the first embodiment, the angle between the first direction X1 and the fifth direction X5 is 25°, and the angle between the third direction X3 and the fifth direction X5 is 65°.

[0059] In the second embodiment, the included angle between the first direction X1 and the fifth direction X5 is 25°, and the included angle between the third direction X3 and the fifth direction X5 is 70°.

[0060] In the third embodiment, the angle between the first direction X1 and the fifth direction X5 is 30°, and the angle between the third direction X3 and the fifth direction X5 is 65°.

[0061] In the fourth embodiment, the angle between the first direction X1 and the fifth direction X5 is 30°, and the angle between the third direction X3 and the fifth direction X5 is 70°.

[0062] In the fifth embodiment, the angle between the first direction X1 and the fifth direction X5 is 35°, and the angle between the third direction X3 and the fifth direction X5 is 65°.

[0063] In the sixth embodiment, the angle between the first direction X1 and the fifth direction X5 is 35°, and the angle between the third direction X3 and the fifth direction X5 is 70°.

[0064] In the seventh embodiment, the included angle between the first direction X1 and the fifth direction X5 is 35°, and the included angle between the third direction X3 and the fifth direction X5 is 75°.

[0065] In the eighth embodiment, the angle between the first direction X1 and the fifth direction X5 is 30°, and the angle between the third direction X3 and the fifth direction X5 is 75°.

[0066] In the ninth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 35°, and the included angle between the third direction X3 and the fifth direction X5 is 80°.

[0067] In the tenth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 35°, and the included angle between the third direction X3 and the fifth direction X5 is 60°.

[0068] In the eleventh embodiment, the included angle between the first direction X1 and the fifth direction X5 is 30°, and the included angle between the third direction X3 and the fifth direction X5 is 80°.

[0069] In the twelfth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 40°, and the included angle between the third direction X3 and the fifth direction X5 is 60°.

[0070] In the thirteenth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 40°, and the included angle between the third direction X3 and the fifth direction X5 is 65°.

[0071] In the fourteenth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 40°, and the included angle between the third direction X3 and the fifth direction X5 is 70°.

[0072] In the fifteenth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 40°, and the included angle between the third direction X3 and the fifth direction X5 is 75°.

[0073] In the sixteenth embodiment, the included angle between the first direction X1 and the fifth direction X5 is 40°, and the included angle between the third direction X3 and the fifth direction X5 is 80°.

[0074] The same VA display panel was used and the same current (0.2A) was used to verify the brightness and chromaticity, and the results are shown in Table 1 below.

[0075] Table 1 Brightness and chromaticity test data table

[0076]

[0077]

[0078] It can be seen from the above table that in comparative example 1, when the prism extension directions of the first prism sheet 11 and the second prism sheet 12 are perpendicular to each other, the horizontal direction of the luminous uniformity is close to 3, and its uniformity is very poor, which will seriously affect the display effect; it can be seen from Example 1, Example 3, Example 5 and Example 13 that when the angle between the first direction X1 and the fifth direction X5 is less than 30° (i.e., 25°), the brightness of the light output is low, which also seriously affects the display effect; in addition, it can be seen from Example 7, Example 8 and Example 15 that when the angle between the second direction X1 and the fifth direction X5 is fixed, the angle between the first direction X1 and the fifth direction X5 is When the angle between the first direction X1 and the fifth direction X5 is 30° and 40°, the luminous uniformity reaches above 1.73, and when the angle between the first direction X1 and the fifth direction X5 is between 30° and 40°, the luminous uniformity is 1.73 and below, and the luminous uniformity is better; from Examples 12 to 16, it can be seen that when the angle between the first direction X1 and the fifth direction X5 is fixed, when the angle between the third direction X3 and the fifth direction X5 is 60° and 80°, the luminous uniformity is increased to 1.76, and when the angle between the third direction X3 and the fifth direction X5 is between 60° and 80°, the luminous uniformity is better.

[0079] Therefore, it can be concluded from the above table that when the angle between the first direction X1 and the fifth direction X5 is greater than or equal to 30° and less than or equal to 40°, and the angle between the third direction and the fifth direction is greater than or equal to 60° and less than or equal to 80°, the light output uniformity of the backlight module is relatively high, which can effectively improve the uneven brightness caused by the reflection of the rubber frame; and in the embodiment of the utility model, the extension direction of the first prism 111 and the second prism 121 is designed, which can also effectively improve the light output brightness and light efficiency of the backlight module, so that the display effect of the display device with the backlight module is better.

[0080] Furthermore, in the embodiment of the present invention, the first direction X1 and the third direction X3 are not perpendicular, and the angle between the first direction X1 and the third direction X3 is greater than or equal to 20° and less than or equal to 50°.

[0081] In one embodiment, the optical film set 10 further includes a diffuser 13 disposed on a side of the second prism sheet 12 away from the first prism sheet 11. It should be noted that in the embodiment of the utility model, since the diffuser 13 is located on a side of the first prism sheet 11 away from the fixing portion 21, that is, the first prism sheet 11, rather than the diffuser 13, is closest to the fixing portion 21 in the optical film set 10, therefore, when the light emitted by the light source 33 is reflected by the fixing portion 21 into the second area 102, a reflection phenomenon will occur. If the diffuser 13 is disposed near the fixing portion 21 in the optical film set 10, the reflection phenomenon will not occur because the diffuser 13 itself has the function of diverging and diffusing light.

[0082] Furthermore, please combine Figure 1 , Figure 2 , Figure 6 as well as Figure 7 In one embodiment, the vertex angle a of the first prism 111 located in the second area 102 is greater than 90°. Therefore, the first prism 111 located in the second area 102 can diverge the light reflected back from the side of the fixing portion 21 to further improve the reflection phenomenon in the second area 102 and improve the final display effect.

[0083] It can be understood that the first prism sheet 11 is the film closest to the fixed portion 21 in the optical film group 10, the first prism 111 is a plurality of triangular prisms arranged on the side of the first prism sheet 11 close to the fixed portion 21, and the cross-sectional shape of the first prism 111 is an isosceles triangle, and the vertex angle of the first prism 111 is the angle of the first prism 111 on the light-emitting side of the backlight module, which is the angle between two waists of equal length.

[0084] In one embodiment, since the width of the reflection formed on the first prism sheet 11 by the light reflected back from the side of the fixing portion 21 is less than or equal to the thickness of the fixing portion 21 , the width of the second area 102 along the direction from the first area 101 to the second area 102 is less than or equal to the thickness of the fixing portion 21 .

[0085] It should be noted that, since the first frame 20 is disposed around the optical film set 10 , and the fixing portion 21 is also located at the peripheral edge of the first prism sheet 11 , the second area 102 is also located at the peripheral edge of the optical film set 10 .

[0086] In one embodiment, the top angles of all the first prisms 111 are at 90°, which can effectively increase the light output angle of the backlight module and achieve a light output range with a larger viewing angle. In addition, the first prisms 111 on the first prism sheet 11 are of the same size, which can simplify the manufacturing process of the first prism sheet 11 and reduce the process cost.

[0087] In one embodiment, the vertex angle of the first prism 111 is less than or equal to 100°. For example, the vertex angle of the first prism 111 may be equal to 91°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99° or 100° to avoid the first prism 111 having too large a divergent effect on light and reducing the light output efficiency of the backlight module.

[0088] Furthermore, the vertex angles b of the multiple second prisms are all equal to 90°; it is understandable that due to the increase in the vertex angle b of the first prism 111 in the first prism sheet 11, the light focusing ability and the ability to improve the light output efficiency of the first prism sheet 11 are reduced. Therefore, the vertex angle b of the second prism 121 of the second prism sheet 12 is 90° to ensure the light output efficiency of the backlight module.

[0089] It can be understood that the second prism 121 is a plurality of triangular prisms arranged on the side of the second prism sheet 12 close to the fixed portion 21, and the cross-sectional shape of the second prism 121 is an isosceles triangle. The vertex angle of the second prism 121 is the angle of the second prism 121 on the light-emitting side of the backlight module, which is the angle between two waists of equal length.

[0090] Furthermore, the embodiments of the present invention are as follows Figure 1 The light-emitting effect of the backlight module shown is verified to obtain Example 17, Comparative Example 2 and Comparative Example 3; wherein the embodiment is a test of the backlight module provided by the embodiment of the utility model. In Example 17, the angle between the first direction X1 and the fifth direction X5 is greater than or equal to 30° and less than or equal to 40°, and the angle between the third direction and the fifth direction is greater than or equal to 60° and less than or equal to 80°. Specifically, the angle between the first direction X1 and the fifth direction X5 may include 30°, 35° and 40°, and the angle between the third direction and the fifth direction may include 60°, 65°, 70°, 75° and 80°, so as to obtain multiple sample data; further, the vertex angles of all the first prisms 111 in the first prism sheet 11 are selected from multiple ranges of 90° to 100°, which may include 90°, 95° and 100°, so as to obtain multiple sample data.

[0091] The optical film set in Comparative Example 2 includes two diffusion sheets and one prism sheet, and the two diffusion sheets are located on a side of the prism sheet away from the light emitting side of the backlight module;

[0092] The optical film group in comparative example three includes two prism sheets and a diffuser, and the diffuser is located on the side of the two prism sheets away from the light-emitting side of the backlight module, and the top angles of the prisms in the two prism sheets are both 90°; and the light-emitting effects of embodiment seventeen, comparative example two and comparative example three are verified to obtain the data shown in the following Table 2.

[0093] Table 2 Lighting effect data table

[0094] Comparative Example 2 Comparative Example 3 Embodiment 17 Light output efficiency / 20% improvement Improvement of 8%-10% Picture Taste OK Reflection OK TCO perspective Partially OK NG OK cost / reduce reduce

[0095] It can be seen from the above table that the light output efficiency in comparative example 3 and embodiment 17 are both based on comparative example 2, wherein embodiment 1 can effectively improve the light output efficiency of the backlight module and improve the reflection phenomenon. At the same time, its TCO viewing angle test can be passed and the cost of the backlight module can be reduced.

[0096] In summary, in the embodiment of the utility model, a stacked first prism sheet 11 and a second prism sheet 12 are arranged in the optical film group 10, and the first prism sheet 11 has a plurality of first prisms 111 extending along the first direction X1 and arranged along the second direction X2, and the second prism sheet 12 has a plurality of second prisms 121 extending along the third direction X3 and arranged along the fourth direction X4, wherein the first direction X1 is not perpendicular to the third direction X3, the angle between the first direction X1 and the fifth direction X5 is smaller than the angle between the third direction X3 and the fifth direction X5, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 or the long side of the second prism sheet 12; the embodiment of the utility model adjusts the extension direction of the first prism 111 and the extension direction of the second prism 121 so that they are no longer vertically arranged relative to the related art. It has been verified that the light uniformity, light brightness and light efficiency of the backlight module can be effectively improved, and the brightness unevenness caused by the reflection phenomenon of the rubber frame can be improved. Furthermore, the embodiment of the utility model forms adjacent first and second regions 101 and 102 in the optical film group 10, and the first region 101 is the overlapping region of the optical film group 10 and the fixing portion 21 of the first frame 20, and then by setting the vertex angle of the first prism 111 located in the second region 102 in the first prism sheet 11 close to the fixing portion 21 to be greater than 90°, the diffusion effect of the first prism 111 in the second region 102 is improved, and then the light reflected from the fixing portion 21 to the first prism sheet 11 can be diverged, so as to further improve the reflection phenomenon of the first frame 20, improve the light uniformity of the backlight module, and can improve the light output angle of the backlight module to achieve a light output range with a larger viewing angle; in addition, the embodiment of the utility model can effectively improve the diffusion and scattering effect of the first prism sheet 11 on light by increasing the haze of the first prism sheet 11, improve the reflection phenomenon generated on the first prism sheet 11, and further improve the light uniformity of the backlight module.

[0097] In addition, the present invention also provides a display device, please refer to Figure 8 The display device includes a display panel 40 and a backlight module. The display panel 40 is arranged on the light-emitting side of the backlight module. It can be understood that the backlight module can be the backlight module described in the above embodiment.

[0098] Among them, the display panel 40 is arranged on the side of the fixing part 21 away from the optical film group 10. Specifically, the display panel 40 is arranged on the first frame 20, and the display panel 40 includes an array substrate 41 and a color film substrate 42 arranged relatively to each other, a first polarizer 43 arranged on the side of the array substrate 41 away from the color film substrate 42, and a second polarizer 44 arranged on the side of the color film substrate 42 away from the array substrate 41.

[0099] It should be noted that the display device provided in the embodiment of the utility model can be a VA (Vertical Alignment) type liquid crystal display, an IPS (In-Plane Switching) type liquid crystal display, or an FFS (Fringe Field Switching) type liquid crystal display.

[0100] In summary, in the embodiment of the utility model, a stacked first prism sheet 11 and a second prism sheet 12 are arranged in the optical film group 10, and the first prism sheet 11 has a plurality of first prisms 111 extending along the first direction X1 and arranged along the second direction X2, and the second prism sheet 12 has a plurality of second prisms 121 extending along the third direction X3 and arranged along the fourth direction X4, wherein the first direction X1 is not perpendicular to the third direction X3, the angle between the first direction X1 and the fifth direction X5 is smaller than the angle between the third direction X3 and the fifth direction X5, and the fifth direction X5 is parallel to the long side of the first prism sheet 11 or the long side of the second prism sheet 12; the embodiment of the utility model adjusts the extension direction of the first prism 111 and the extension direction of the second prism 121 so that they are no longer vertically arranged relative to the related art. It has been verified that the light uniformity, light brightness and light efficiency of the backlight module can be effectively improved, and the brightness unevenness caused by the reflection phenomenon of the rubber frame can be improved. Furthermore, in the embodiment of the utility model, the adjacent first area 101 and the second area 102 are formed in the optical film group 10, and the first area 101 is the area where the optical film group 10 and the fixing portion 21 of the first frame 20 overlap, and then by setting the vertex angle of the first prism 111 located in the second area 102 in the first prism sheet 11 close to the fixing portion 21 to be greater than 90°, the diffusion effect of the first prism 111 in the second area 102 is improved, and the light reflected from the fixing portion 21 to the first prism sheet 11 can be diffused. Divergence can further improve the reflection phenomenon of the first frame 20, improve the light uniformity of the backlight module, and can increase the light output angle of the backlight module to achieve a light output range with a larger viewing angle; in addition, the embodiment of the utility model can effectively improve the diffusion and scattering effect of the first prism sheet 11 on light by increasing the haze of the first prism sheet 11, improve the reflection phenomenon generated on the first prism sheet 11, and further improve the light uniformity of the backlight module; and then when the backlight module is used in a display device, it can effectively improve the display effect of the display device.

[0101] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0102] The above is a detailed introduction to a backlight module and a display device provided in an embodiment of the utility model. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the utility model. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A backlight module, characterized in that: include: An optical film set, comprising a first prism sheet and a second prism sheet which are stacked, wherein a surface of the first prism sheet away from the second prism sheet is provided with a plurality of first prisms, and a surface of the second prism sheet close to the first prism sheet is provided with a plurality of second prisms; A plurality of the first prisms extend along a first direction and are arranged along a second direction, the first direction and the second direction intersect, and the first direction and the second direction are both parallel to the first prism sheet; A plurality of the second prisms extend along a third direction and are arranged along a fourth direction, the third direction intersects the fourth direction, and the third direction and the fourth direction are both parallel to the second prism sheet; Among them, the first direction is not perpendicular to the third direction, the angle between the first direction and the fifth direction is smaller than the angle between the third direction and the fifth direction, and the fifth direction is parallel to the long side of the first prism sheet or the long side of the second prism sheet, and the haze of the first prism sheet is greater than 45%.

2. The backlight module according to claim 1, characterized in that: An angle between the first direction and the third direction is greater than or equal to 20° and less than or equal to 50°.

3. The backlight module according to claim 1, characterized in that: The angle between the first direction and the fifth direction is greater than or equal to 30° and less than or equal to 40°; An angle between the third direction and the fifth direction is greater than or equal to 60° and less than or equal to 80°.

4. The backlight module according to claim 1 or 3, characterized in that: A long side of the first prism sheet is parallel to a long side of the second prism sheet.

5. The backlight module according to claim 1, characterized in that: The backlight module also includes: A first frame body is arranged around the optical film group, and the first frame body includes a fixing portion located on the optical film group near the light emitting side of the backlight module; Among them, the optical film group includes a first area overlapping with the fixed part along the thickness direction of the optical film group, and a second area adjacent to the first area, the second area is located on a side of the first area close to the center of the optical film group, the first prism sheet is located on a side of the optical film group close to the fixed part, the first prism is located on a side of the first prism sheet close to the fixed part, and the vertex angle of the first prism located in the second area is greater than 90°.

6. The backlight module according to claim 5, characterized in that: An atomized coating is provided on a surface of the first prism sheet away from the fixing portion, and particles are doped in the atomized coating.

7. The backlight module according to claim 5, characterized in that: The second prism sheet is located on a side of the first prism sheet away from the fixing portion, and the optical film sheet set further includes a diffusion sheet disposed on a side of the second prism sheet away from the first prism sheet.

8. The backlight module according to claim 5, characterized in that: A width of the second region along a direction in which the first region approaches the second region is less than or equal to a thickness of the fixing portion.

9. The backlight module according to claim 5, characterized in that: The vertex angles of all the first prisms are greater than 90°.

10. The backlight module according to claim 1 or 9, characterized in that: The vertex angle of the first prism is less than or equal to 100°.

11. The backlight module according to claim 1, characterized in that: The vertex angle of the second prism is equal to 90°.

12. A display device, characterized in that: The display device comprises a display panel and the backlight module according to any one of claims 1 to 11, wherein the display panel is arranged on a light emitting side of the backlight module.

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