Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device, and belongs to the technical field of display. The backlight module can comprise a shell, a light source component and optical films, the optical films are located on the light emitting side of the light source component, and at least one optical film in the multiple optical films is a first dimming piece. After the incident light is adjusted by the multiple first dimming parts in the first dimming piece, the brightness of the emergent light of the backlight module is gradually reduced from the direction with the emergent angle being 50 degrees to the direction with the emergent angle being 70 degrees on the vertical field angle. Under the condition, an obvious light and dark area boundary can be prevented from appearing on a picture at a large viewing angle when the display device is used for displaying, so that the display effect of the display device can be improved.

Description

Technical Field

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

[0002] A backlight module is a structure that provides a backlight for a display device. It typically includes a light source component and multiple optical films located on the light-emitting side of the light source component.

[0003] Currently, at wide viewing angles, display devices sometimes exhibit a situation where the brightness of a certain viewing area is significantly higher than the brightness of other viewing areas on either side of that area. This results in a distinct boundary between bright and dark areas on the display screen at wide viewing angles, ultimately leading to poor display performance. Utility Model Content

[0004] This application provides a backlight module and a display device. It can solve the problem of poor display effect in existing display devices. The technical solution is as follows:

[0005] On one hand, a backlight module is provided, characterized in that it includes: a light source component, and a plurality of optical films located on the light-emitting side of the light source component; at least one of the plurality of optical films is a first dimming film;

[0006] The first dimming sheet includes: a first substrate, and a plurality of first dimming sections located on the side of the first substrate opposite to the light source component;

[0007] The plurality of first dimming units are used to adjust the incident light so that, at the vertical field of view of the backlight module, the brightness of the light emitted from the backlight module at the first viewing angle is greater than or equal to the brightness of the light at the second viewing angle; wherein the light emission angle of the light at the first viewing angle is less than the light emission angle of the light at the second viewing angle, and the light emission angles of both the light at the first viewing angle and the light at the second viewing angle are within the range of 50 degrees to 70 degrees.

[0008] Optionally, for any one of the first dimming portions in the first dimming sheet, the first dimming portion is a prism structure protruding outward relative to the first substrate, and the first dimming portion is strip-shaped; the first dimming portion has: two first side surfaces disposed opposite to each other in the extension direction perpendicular to the first dimming portion; the two first side surfaces are connected on the side away from the first substrate, and the included angle between the two first side surfaces is in the range of 95 degrees to 98 degrees.

[0009] Optionally, the included angle between the two first sides is 96 degrees.

[0010] Optionally, for any one of the first dimming portions in the first dimming sheet, the first dimming portion is a prism structure protruding outward relative to the first substrate, and the first dimming portion is strip-shaped; the first dimming portion has: a second side surface and a third side surface disposed opposite to each other in the extension direction perpendicular to the first dimming portion, and a first connecting surface parallel to the first substrate; the side of the second side surface facing away from the first substrate and the side of the third side surface facing away from the first substrate are connected through the first connecting surface.

[0011] Optionally, the first dimming film further includes: an adhesive film located on the side of the first substrate opposite to the plurality of first dimming sections, the adhesive film containing particles, and the haze of the adhesive film being 36%-45%.

[0012] Optionally, at least one of the plurality of optical films in the backlight module is a second dimming film, and the second dimming film is located on the side of the first dimming film away from the light source component;

[0013] The second dimming sheet includes: a second substrate, and a plurality of second dimming units;

[0014] For any one of the second dimming sections in the second dimming sheet, the second dimming section is strip-shaped, the second dimming section is located on the side of the second substrate away from the light source component, and the second dimming section is a concave structure that is recessed inward relative to the second substrate; or, the second dimming section is located on the side of the second substrate facing the light source component, and the second dimming section is a prism structure that is protruding outward relative to the second substrate.

[0015] Optionally, when the second dimming part is located on the side of the second substrate facing the light source component, and the second dimming part is a prism structure protruding outward relative to the second substrate, the second dimming part has: two fourth side surfaces disposed opposite each other in the extending direction perpendicular to the second dimming part, and the two fourth side surfaces are connected to the side away from the second substrate.

[0016] Alternatively, the second dimming unit has: a fifth side surface and a sixth side surface disposed opposite to each other in an extension direction perpendicular to the first dimming unit, and a second connecting surface parallel to the second substrate, wherein the side of the fifth side surface facing away from the second substrate and the side of the sixth side surface facing away from the second substrate are connected by the second connecting surface.

[0017] Optionally, the backlight module further includes: a housing, wherein the light source component and the plurality of optical films are all installed inside the housing;

[0018] At least one of the optical films in the backlight module is a third dimming film, and the third dimming film is located on the side of the first dimming film facing the light source component;

[0019] The third dimming sheet includes: a main body portion, and a plurality of protruding structures fixedly connected to the outer edge of the main body portion; the plurality of protruding structures are used to attach to the outer shell.

[0020] The main body has a light-transmitting area and a screen-printed light-shielding area located around the light-transmitting area. The width of the area adjacent to the convex structure in the screen-printed light-shielding area is smaller than the width of other areas.

[0021] Optionally, the light source component includes: a light strip and a light guide plate, wherein the light-emitting surface of the light strip faces the side of the light guide plate;

[0022] The third dimming plate protrudes from the side of the light guide plate facing the light strip on the side facing the light strip, and the side of the light guide plate facing the light strip protrudes from the side of the first dimming plate facing the light strip on the side facing the light strip.

[0023] On the other hand, a display device is provided, the display device comprising: a liquid crystal display panel and a backlight module, wherein the backlight module is any of the backlight modules described above.

[0024] The beneficial effects of the technical solutions provided in this application include at least the following:

[0025] By optimizing the structure of the first dimming unit in the first dimming sheet, the brightness of the light emitted from the backlight module gradually decreases from a 50-degree angle to a 70-degree angle in the vertical field of view after the multiple first dimming units in the first dimming sheet adjust the incident light. In this case, obvious bright and dark area boundaries can be avoided when the display device is viewed at wide angles, thereby improving the display effect of the device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional schematic diagram of a backlight module provided in an embodiment of this application;

[0028] Figure 2 yes Figure 1A top view of the housing in the backlight module is shown;

[0029] Figure 3 This is a three-dimensional structural diagram of a first dimming sheet provided in an embodiment of this application;

[0030] Figure 4 yes Figure 3 A schematic cross-sectional view of the first dimming plate at BB' is shown;

[0031] Figure 5 It is a viewing angle brightness curve of a backlight module at the vertical field of view.

[0032] Figure 6 yes Figure 3 Another cross-sectional schematic diagram of the first dimming plate at BB' is shown;

[0033] Figure 7 yes Figure 3 Another cross-sectional schematic diagram of the first dimming plate at BB' is shown;

[0034] Figure 8 It is a viewing angle brightness curve of a backlight module at a horizontal field of view.

[0035] Figure 9 This is a cross-sectional schematic diagram of a second dimming sheet provided in an embodiment of this application;

[0036] Figure 10 This is a cross-sectional schematic diagram of another second dimming sheet provided in an embodiment of this application;

[0037] Figure 11 This is a cross-sectional schematic diagram of another second dimming sheet provided in the embodiments of this application;

[0038] Figure 12 This is a cross-sectional schematic diagram of a display device provided in an embodiment of this application;

[0039] Figure 13 This is a top view schematic diagram of a third dimming film provided in an embodiment of this application;

[0040] Figure 14 This is a top view of a casing provided in an embodiment of this application;

[0041] Figure 15 The backlight module provided in the embodiments of this application is in Figure 13 A schematic diagram of a cross-section at point CC';

[0042] Figure 16 The backlight module provided in the embodiments of this application is in Figure 13 A schematic diagram of a cross-section at point DD';

[0043] Figure 17 The backlight module provided in the embodiments of this application is in Figure 13 A schematic diagram of a cross-section at EE'. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0045] Please refer to Figure 1 , Figure 1 This is a cross-sectional schematic diagram of a backlight module provided in an embodiment of this application. The backlight module 000 may include: a light source component 200, and a plurality of optical films 300 located on the light-emitting side of the light source component 200.

[0046] In this application, the backlight module 000 may further include a housing 100. The light source component 200 and multiple optical films 300 can all be assembled within the housing 100. For example, as shown... Figure 1 and Figure 2 As shown, Figure 2 yes Figure 1 The diagram shows a top view of the housing in the backlight module 000. The housing 100 in the backlight module 000 may include a base plate 101 and an annular flange 102. One side of the annular flange 102 is connected to the base plate 101, and the annular flange 102 and the base plate 101 are used to form a receiving cavity Z1. The side of the annular flange 102 facing away from the base plate 101 has a light-transmitting opening Z2. The annular flange 102 may include a first flange 1021 and a second flange 1022 disposed opposite to each other in a first direction X, and a third flange 1023 and a fourth flange 1024 disposed opposite to each other in a second direction Y. The first flange 1021, the third flange 1023, the second flange 1022, and the fourth flange 1024 may be sequentially connected around the base plate 101. The first direction X intersects the second direction Y. For example, the first direction X may be perpendicular to the second direction Y. Figure 1 For backlight module 000 in Figure 2 A schematic diagram of a cross-section in the AA' direction.

[0047] The backlight module 000 is a structure that provides a backlight source for the display device. The backlight module 000 includes various possible structures, such as an edge-lit backlight module and a direct-lit backlight module. This application's embodiment uses an edge-lit backlight module as an example for illustrative purposes.

[0048] When the backlight module 000 is a side-lit backlight module, the light source component 200 in the backlight module 000 may include: a light strip 201 and a light guide plate 202. The light strip 201 may be located on the side of the third fold 1023 facing the accommodating cavity Z1; that is, the extension direction of the light strip 201 may be parallel to the first direction X. The light guide plate 202 may be located within the accommodating cavity Z1, with the light-emitting surface of the light strip 201 facing the side of the light guide plate 202 near the third fold 1023. The light guide plate 202 is used to refract and guide the light emitted by the light strip 201, so that the light can be uniformly emitted from the side of the light guide plate 202 facing the light-transmitting opening Z2 of the backlight module 000.

[0049] The light-emitting side of the light source component 200 in the backlight module 000 is the side of the light source component 200 that is away from the base plate 101. That is, the multiple optical films 300 in the backlight module 000 are all located on the side of the light source component 200 that is away from the base plate 101.

[0050] In this application, at least one of the plurality of optical films 300 is a first dimming film 400. The first dimming film 400 is the prism sheet in the backlight module 000.

[0051] Please refer to Figure 3 and Figure 4 , Figure 3 This is a three-dimensional structural diagram of a first dimming film provided in an embodiment of this application. Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the first dimming sheet at BB'. The first dimming sheet 400 may include: a first substrate 401, and a plurality of first dimming portions 402 located on the side of the first substrate 401 facing away from the light source component 200. For any one of the first dimming portions 402 in the first dimming sheet 400, the first dimming portion 402 is a prism structure protruding outward relative to the first substrate 401, and the first dimming portion 402 is strip-shaped. The first dimming portion 402 has: two first side surfaces 4021 disposed opposite each other in a direction perpendicular to the extension of the first dimming portion 402, and the two first side surfaces 4021 are connected on the side facing away from the first substrate 401. Typically, the included angle between the two first side surfaces 4021 in the first dimming portion 402 is 90 degrees.

[0052] It should be noted that in the side-lit backlight module 000, the extension direction of the first dimming unit 402 is parallel to the extension direction of the lamp strip 201. For example, if the lamp strip 201 in the side-lit backlight module 000 extends along the first direction X, then multiple first dimming units 402 all extend along the first direction X, and the two first side surfaces 4021 of the first dimming units 402 are arranged opposite each other in the second direction Y, which is perpendicular to the first direction X. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the first base 401, and the third direction Z is perpendicular to the plane containing the first base 401.

[0053] It should also be noted that, since the light directionality is poor after passing through the light guide plate 202, the first dimming plate 400 is needed to adjust the light direction and correct it to achieve a focusing effect, ensuring that more light is emitted from the front of the backlight module 000, thereby improving the brightness of the front display. However, when the angle between the two first side surfaces 4021 in the first dimming section 402 is 90 degrees, some light rays with larger emission angles will be lost and wasted in the light emitted from the side of the first dimming plate 400 away from the light source component 200. Furthermore, this portion of light will concentrate at a large viewing angle, resulting in the backlight module 000 emitting light having a brightness at a certain larger viewing angle that is significantly greater than the brightness at the adjacent smaller viewing angle.

[0054] For example, such as Figure 4 As shown, when the angle between the two first side surfaces 4021 in the first dimming unit 402 is 90 degrees, a portion of the light rays arriving at the first side surface 4021 (e.g., light ray A) has an incident angle smaller than the total internal reflection angle of the first side surface 4021. This portion of light rays can exit from the light-emitting side of the first dimming unit 402, and the first dimming plate 400 converges this portion of light rays, concentrating its exit angle within a ±35-degree viewing angle on the vertical field of view. Therefore, the first dimming plate 400 can improve the brightness of the backlight module within a relatively small viewing angle range. According to actual test data, this portion of light rays accounts for approximately 36.8% of the incident light rays.

[0055] Of the light rays reaching the first side 4021, another portion of the light rays (e.g., light rays B, C, and D) have an incident angle greater than or equal to the total internal reflection angle of the first side 4021, and this portion of the light rays will undergo total internal reflection at the first side 4021.

[0056] Among them, a portion of the light (e.g., light B) can be totally reflected by the first side 4021 and then emitted from the incident light side of the first dimming plate 400.

[0057] It should be noted that, as Figure 1As shown, the backlight module 000 may further include a reflective sheet 1500, which may be located on the side of the light guide plate 202 facing the base plate 101. Here, the reflective sheet 1500 is used to reflect light, improve light utilization, and enhance the light guiding effect of the light guide plate 202 and the light output brightness of the backlight module 000.

[0058] Therefore, this portion of the light can be refracted or reflected by structures such as the light guide plate 202 and the reflector 1500, allowing it to re-enter the first dimming plate 400 and changing its incident angle so that it can exit from the light-emitting side of the first dimming plate 400, thereby improving light utilization. According to actual test data, this portion of the light accounts for approximately 46.3% of the incident light.

[0059] Another portion of the light (e.g., light ray C) can undergo total internal reflection via the first side surface 4021 and exit from the light-emitting side of the adjacent first side surface 4021. It then re-enters the adjacent first dimming section 402, undergoes refraction and reflection, and exits from the light-incident side of the first dimming plate 400. This portion of the light can also be refracted or reflected by structures such as the light guide plate 202 and the reflector 1500, allowing it to re-enter the first dimming plate 400 and changing its incident angle so that it can exit again from the light-emitting side of the first dimming plate 400, thereby improving light utilization. According to actual test data, this portion of the light accounts for approximately 11.8% of the incident light.

[0060] A portion of the light (e.g., light D) can be totally internally reflected by the first side 4021 and emitted from the light-emitting side of the adjacent first side 4021, without re-entering the adjacent first dimming section 402. The first dimming plate 400 does not converge this portion of the light, and since this portion of the light has a large emission angle, it will concentrate at a large viewing angle in the vertical field of view of the backlight module. This results in the emitted light from the backlight module 000 exhibiting a brightness at a certain large viewing angle that is significantly greater than the brightness at an adjacent smaller viewing angle. In other words, the vertical viewing angle brightness curve of the backlight module will be distorted at a large viewing angle. According to actual test data, this portion of the light accounts for approximately 5.1% of the incident light.

[0061] For example, such as Figure 5 As shown, Figure 5 This is a viewing angle brightness curve of a backlight module at the vertical field of view, where the horizontal axis represents the light emission angle at the vertical field of view of the backlight module 000, and the vertical axis represents the relative brightness of the emitted light. Here, curve 1 is... Figure 4The diagram shows the viewing angle brightness curve of the backlight module of the first dimming plate at the vertical viewing angle. According to curve 1, at the vertical viewing angle of the backlight module 000, the brightness of the light emitted from the backlight module 000 will fluctuate within a viewing angle range of 50 to 70 degrees. In this situation, when the display device 002 is used, a clear boundary between bright and dark areas will appear at large viewing angles, resulting in poor display performance of the display device 002.

[0062] Therefore, the backlight module 000 provided in this application can optimize the structure of the first dimming unit 402 in the first dimming plate 400, so that after the multiple first dimming units 402 adjust the incident light, the brightness of the light emitted from the backlight module 000 at the vertical field of view of the backlight module 000 at the first viewing angle is greater than or equal to the brightness of the light at the second viewing angle. Specifically, the light emission angle of the light at the first viewing angle is smaller than the light emission angle of the light at the second viewing angle, and both the light emission angles of the first and second viewing angles are within the range of 50 degrees to 70 degrees.

[0063] For example, such as Figure 5 As shown, curve 2 is the viewing angle brightness curve of the backlight module after structural optimization of the first dimming unit 402 in the first dimming plate 400 according to this application, at the vertical viewing angle. The brightness of the light emitted from the backlight module 000 gradually decreases from an emission angle of 50 degrees to an emission angle of 70 degrees at the vertical viewing angle. In this case, obvious bright and dark area demarcation lines can be avoided when the display device 002 displays the image at wide viewing angles, thereby improving the display effect of the display device 002.

[0064] In summary, this application provides a backlight module, including: a housing, a light source component, and optical films. The optical films are located on the light-emitting side of the light source component, and at least one of the optical films is a first dimming film. After the multiple first dimming units in the first dimming film adjust the incident light, the brightness of the light emitted from the backlight module gradually decreases from a direction with an emission angle of 50 degrees to a direction with an emission angle of 70 degrees in the vertical field of view. In this case, obvious bright and dark area boundaries can be avoided when the display device is displaying the image at a wide viewing angle, thereby improving the display effect of the display device.

[0065] In this application embodiment, there are multiple possible ways to optimize the structure of the first dimming unit 402 in the first dimming film 400. This application embodiment will illustrate the following two possible implementations as examples:

[0066] The first possible implementation is as follows: Figure 6 As shown, Figure 6 yes Figure 3The diagram shows another cross-sectional view of the first dimming sheet at BB'. For any one of the first dimming portions 402 in the first dimming sheets 400, the first dimming portion 402 is a prism structure protruding outward relative to the first substrate 401, and the first dimming portion 402 is strip-shaped. The first dimming portion 402 has two first side surfaces 4021 disposed opposite each other in a direction perpendicular to the extension of the first dimming portion 402, the two first side surfaces 4021 being connected on the side away from the first substrate 401, and the included angle between the two first side surfaces 4021 being in the range of 95 degrees to 98 degrees. Preferably, the included angle between the two first side surfaces 4021 is 96 degrees.

[0067] In this situation, the proportion of light that undergoes total internal reflection in the light reaching the first side 4021 decreases. Therefore, the first dimming plate 400 can increase the brightness of the backlight module in a smaller viewing angle range. The light that is emitted from the light-emitting side of the adjacent first side 4021 after total internal reflection by the first side 4021 and will not re-enter the adjacent first dimming section 402 is reduced. This reduces the brightness of this part of the light concentrated at a large viewing angle, thereby optimizing the brightness curve of the vertical viewing angle.

[0068] For example, such as Figure 5 As shown in Figure 2, based on actual test results, when the angle between the two first sides 4021 is 96 degrees, the viewing angle brightness curve of the backlight module using the first dimming plate 400 at the vertical field of view is as follows: In the vertical field of view, the brightness of the emitted light from the backlight module 000 is relatively high within a range of ±40 degrees at the emission angle; and the brightness gradually decreases from the emission angle of 50 degrees to the emission angle of 70 degrees. Since the display device 002 may also include a liquid crystal display panel 001, the display effect of the display device can be further optimized by considering the viewing angle transmittance of the liquid crystal display panel 001. This avoids obvious bright and dark area demarcation lines in the image at large viewing angles when the display device 002 is displayed, thereby improving the display effect of the display device 002. It should be noted that in this possible implementation, the extension direction of the first dimming unit 402 is parallel to the extension direction of the lamp strip 201. For example, in a side-lit backlight module 000, the light strip 201 extends along a first direction X, and multiple first dimming sections 402 also extend along the first direction X. Two first side surfaces 4021 of each first dimming section 402 are positioned opposite each other in a second direction Y, which is perpendicular to the first direction X. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the first substrate 401.

[0069] The second possible implementation is as follows: Figure 7 As shown, Figure 7 yes Figure 3This is another cross-sectional view of the first dimming sheet at BB'. For any one of the first dimming portions 402 in the first dimming sheets 400, the first dimming portion 402 is a prism structure protruding outward relative to the first base 401, and the first dimming portion 402 is strip-shaped. The first dimming portion 402 has: a second side surface 4022 and a third side surface 4023 disposed opposite to each other in a direction perpendicular to the extension of the first dimming portion 402, and a first connecting surface 4024 parallel to the first base 401. The side of the second side surface 4022 facing away from the first base 401 and the side of the third side surface 4023 facing away from the first base 401 are connected by the first connecting surface 4024. For example, the angle between the second side surface 4022 and the first connecting surface 4024 can be 135 degrees, and the angle between the third side surface 4023 and the first connecting surface 4024 can also be 135 degrees.

[0070] In this configuration, a portion of the incident light from the first dimming plate 400 exits from the second side 4022 or the third side 4023. This portion of the emitted light converges towards the forward viewing angle after passing through the first dimming plate 400, where the light exit angle at the forward viewing angle is 0 degrees. The other portion of the light exits from the first connecting surface 4024. Since the first connecting surface 4024 is parallel to the first substrate 401, the light angle of this portion of the emitted light does not change after passing through the first dimming plate 400. That is, in this configuration, the first dimming plate 400 only converges a portion of the incident light, without altering the light path of the other portion. This allows more light to exit towards a larger viewing angle in the vertical field of view, resulting in a more uniform light output from the backlight module and preventing the curve from warping due to the concentration of a small portion of light at a large viewing angle. Therefore, the backlight module 000 using the first dimming plate 400 with the above structure can also achieve a viewing angle brightness curve in the vertical field of view. Figure 5 The effect shown by curve 2 is that the brightness of the light emitted by the backlight module 000 gradually decreases from the direction of the emission angle of 50 degrees to the direction of the emission angle of 70 degrees in the vertical field of view. This can avoid obvious dividing lines between bright and dark areas in the picture at a wide viewing angle when the display device 002 is displayed, thus improving the display effect of the display device 002.

[0071] It should be noted that in this possible implementation, the extension direction of the first dimming unit 402 is parallel to the extension direction of the lamp strip 201. For example, if the lamp strip 201 in the side-lit backlight module 000 extends along the first direction X, then multiple first dimming units 402 all extend along the first direction X, and the second side surface 4022 and the third side surface 4023 of the first dimming unit 402 are arranged opposite each other in the second direction Y, which is perpendicular to the first direction X. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the first substrate 401.

[0072] It should also be noted that the materials of the first substrate 401 and the first dimming part 402 in the first dimming sheet 400 may include PET material (Polyethylene Terephthalate, PET) or TAC material (Triacetyl Cellulose, TAC).

[0073] like Figure 6 and Figure 7 As shown, the first dimming film 400 may further include a first adhesive film 403 located on the side of the first substrate 401 opposite to the plurality of first dimming units 402. The first adhesive film 403 contains particles 700, which provide haze to the first adhesive film 403, thereby allowing the first dimming film 400 to scatter light to a certain extent. Appropriate haze can improve the contrast of the display device 002 while ensuring the light transmittance of the first dimming film 400, thus ensuring a better display effect of the display panel. The haze of the first adhesive film 403 is also the back-coating haze of the first dimming film 400. Typically, the haze of the first adhesive film 403 is 10%-20%, and for example, the haze of the first adhesive film 403 can be 15%.

[0074] In this embodiment, when the first dimming film 400 is any of the above-described implementations, the haze of the first adhesive film 403 can be 36%-45%. Preferably, the haze of the first adhesive film 403 can be 40%. This further ensures that the brightness of the light emitted from the backlight module 000 gradually decreases from the direction of the emission angle of 50 degrees to the direction of the emission angle of 70 degrees in the vertical field of view. This avoids obvious bright and dark area demarcation lines appearing in the image at wide viewing angles when the display device 002 is displayed, thus improving the display effect of the display device 002.

[0075] It should be noted that, on the one hand, because the structure of the plurality of first dimming units 402 in the first dimming sheet 400 is adjusted in this embodiment, the light-gathering effect of the first dimming sheet 400 is weaker, causing the light originally emitted from the frontal viewing angle to be diverted to the viewing angles on both sides of the frontal viewing angle; on the other hand, the haze of the first film 403 in the first dimming sheet 400 is also adjusted in this embodiment. When the haze of the first film 403 is large, the light transmittance of the first dimming sheet 400 is low. Therefore, the adjustment of the first dimming sheet 400 will lead to a loss of luminous efficacy gain at the frontal viewing angle of the display device 002. The structural solution of the first dimming sheet 400 provided in this embodiment can minimize the loss of luminous efficacy gain while optimizing the vertical field-of-view brightness curve, ensuring that the power consumption of the display device 002 is low and the display effect is good. For example, when the angle between the two first sides 4021 of the first dimming part 402 in the first dimming film 400 is 96 degrees and the haze of the first film 403 is 40%, the light efficiency gain decreases by only about 6% compared to the first dimming film 400 when the angle between the two first sides 4021 of the first dimming part 402 is 90 degrees and the haze of the first film 403 is 15%.

[0076] At the horizontal field of view of the backlight module 000, the brightness of the light emitted from the backlight module 000 at the third viewing angle is significantly lower than that at the fourth viewing angle. Specifically, the emission angle of the light from the third viewing angle is greater than that of the light from the fourth viewing angle. That is, at the wider horizontal viewing angle of the backlight module 000, the brightness decays more rapidly, resulting in poor display performance of the display device 002 at these wider horizontal viewing angles. For example, when the emission angle of the light from the third viewing angle is 45 degrees and the emission angle of the light from the fourth viewing angle is 0 degrees, the brightness decay of the light from the third viewing angle relative to the brightness of the light emitted from the backlight module 000 at the fourth viewing angle is greater than or equal to 50%. For example, please refer to... Figure 8 , Figure 8 This is a viewing angle brightness curve of a backlight module at a horizontal field of view. The horizontal axis represents the light emission angle at a horizontal field of view of the backlight module (000), and the vertical axis represents the relative brightness of the emitted light. Curve 3 uses... Figure 4 The diagram shows the viewing angle brightness curve of a backlight module of the first dimming plate at the horizontal viewing angle. The relative brightness of the emitted light at a 45-degree viewing angle is 0.48, that is, the brightness of the light at a 45-degree viewing angle is attenuated by 52% compared to the brightness of the light at a 0-degree viewing angle (i.e., the positive viewing angle).

[0077] like Figure 8As shown, curve 4 is a luminance curve of a backlight module in the horizontal field of view provided in this embodiment of the application. The backlight module 000 can be any of the first dimming plates 400 in the above embodiments. In the horizontal field of view of the backlight module 000, the brightness attenuation of the light emitted from the third viewing angle of the backlight module 000 is reduced compared to the brightness of the light emitted from the fourth viewing angle of the backlight module 000. The light emission angle of the third viewing angle is greater than that of the fourth viewing angle. For example, in the horizontal field of view of the backlight module 000, the relative brightness of the emitted light at a 45-degree viewing angle is 0.505, that is, the brightness attenuation of the light at a 45-degree viewing angle compared to the brightness of the light at a 0-degree viewing angle (i.e., the positive viewing angle) is 49.5%.

[0078] To further optimize the viewing angle brightness curve of the backlight module 000 at the horizontal viewing angle, reduce the brightness attenuation at the large horizontal viewing angle, and improve the display effect of the display device 002, this application embodiment provides a backlight module 000, which may further include: a second dimming sheet 500.

[0079] like Figure 1 As shown, at least one of the multiple optical films 300 of the backlight module 000 is a second dimming film 500, and the second dimming film 500 is located on the side of the first dimming film 400 opposite to the light source component 200. Please refer to... Figure 9 , Figure 9 This is a cross-sectional schematic diagram of a second dimming sheet provided in an embodiment of this application. The second dimming sheet 500 in the backlight module 000 may include a second substrate 501 and a plurality of second dimming portions 502. For any one of the second dimming portions 502 in the second dimming sheet 500, the second dimming portion 502 is strip-shaped. The extending direction of the second dimming portion 502 is perpendicular to the extending direction of the first dimming portion 402. For example, when the first dimming portion 402 extends along a first direction X, the second dimming portion 502 extends along a second direction Y that is perpendicular to the first direction X. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the second substrate 501.

[0080] In this application embodiment, the structure of the second dimming film 500 can be implemented in various ways. This application embodiment illustrates the following three possible implementations as examples:

[0081] The first possible implementation is as follows: Figure 9As shown, the second dimming section 502 in the second dimming sheet 500 can be located on the side of the second substrate 501 opposite to the light source component 200, and the second dimming section 502 is a concave structure recessed inward relative to the second substrate 501. The radius of curvature of the concave structure of the second dimming section 502 can range from 200 to 300 millimeters. In this way, the second dimming section 502 can adjust the light entering the second dimming sheet 500, causing the light to diverge on the light-emitting side of the second dimming sheet 500. This reduces the difference in brightness between the large horizontal viewing angle and the normal viewing angle, thus allowing the backlight module 000 to experience slower brightness decay as the viewing angle increases in the horizontal field of view. For example, in a backlight module 000 using the above-described second dimming sheet 500, the brightness decay of light at a 45-degree viewing angle relative to the brightness of light at a 0-degree viewing angle (i.e., the normal viewing angle) is less than or equal to 30%.

[0082] In this possible implementation, the second dimming film 500 may further include a second adhesive film 503 located on the side of the second substrate 501 opposite to the plurality of second dimming units 502. The second adhesive film 503 contains particles 700, which provide haze to the second adhesive film 503, thereby allowing the second dimming film 500 to further scatter light, thus ensuring better reduction of brightness attenuation at wide horizontal viewing angles and improving the display effect of the display device 002. The haze of the second adhesive film 503 is also the back coating haze of the second brightness enhancement film. In this embodiment, the haze of the second adhesive film 503 can be 40%.

[0083] For the second possible implementation, please refer to [link / reference]. Figure 10 , Figure 10This is a cross-sectional schematic diagram of another second dimming sheet provided in this application embodiment. The second dimming part 502 in the second dimming sheet 500 can be located on the side of the second substrate 501 facing the light source component 200, and the second dimming part 502 is a prism structure protruding outward relative to the second substrate 501. The second dimming part 502 has two fourth side surfaces 5021 disposed opposite each other in the extending direction perpendicular to the second dimming part 502. The two fourth side surfaces 5021 are connected on the side away from the second substrate 501, and the included angle between the two fourth side surfaces 5021 can be 150 degrees. In this way, the second dimming part 502 can adjust the light entering the second dimming sheet 500, so that the light is diffused on the light-emitting side of the second dimming sheet 500, which can reduce the difference between the brightness at a large horizontal viewing angle and the brightness at a normal viewing angle, thereby making the brightness decay of the backlight module 000 slower when the viewing angle increases in the horizontal field of view. For example, in a backlight module 000 using the second dimming plate 500 described above, the brightness of light at a 45-degree viewing angle is attenuated by less than or equal to 30% compared to the brightness of light at a 0-degree viewing angle (i.e., a positive viewing angle). It should be noted that in this possible implementation, the second dimming unit 502 extends along the second direction Y, and two fourth side surfaces 5021 of the plurality of second dimming units 502 are arranged opposite each other in a first direction X perpendicular to the second direction Y. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the second substrate 501.

[0084] For the third possible implementation, please refer to... Figure 11 , Figure 11 This is a cross-sectional schematic diagram of another second dimming sheet provided in this application embodiment. The second dimming portion 502 in the second dimming sheet 500 can be located on the side of the second base 501 facing the light source component 200, and the second dimming portion 502 is a prism structure protruding outward relative to the second base 501. The second dimming portion 502 has: a fifth side surface 5022 and a sixth side surface 5023 disposed opposite to each other in a direction perpendicular to the extension of the second dimming portion 502, and a second connecting surface 5024 parallel to the second base 501. The side of the fifth side surface 5022 facing away from the second base 501 and the side of the sixth side surface 5023 facing away from the second base 501 are connected by the second connecting surface 5024. For example, the angle between the fifth side surface 5022 and the second connecting surface 5024 can be 135 degrees, and the angle between the sixth side surface 5023 and the second connecting surface 5024 can also be 135 degrees. It should be noted that in this possible implementation, the second dimming unit 502 extends along the second direction Y, and the fifth side surface 5022 and the sixth side surface 5023 of the plurality of second dimming units 502 are arranged opposite each other in the first direction X, which is perpendicular to the second direction Y. Here, the plane containing the first direction X and the second direction Y is parallel to the plane containing the second substrate 501.

[0085] Please refer to Figure 12 , Figure 12 This is a cross-sectional schematic diagram of a display device provided in an embodiment of this application. The display device 002 may include: a liquid crystal display panel 001 and a backlight module 000, wherein the backlight module 000 may be any backlight module 000 given in the embodiments of this application. Here, the back side of the liquid crystal display panel 001 may be connected to the backlight module 000. Exemplarily, the backlight module 000 may further include: a frame 800, which may overlap with the housing 100 to fix the optical film 300.

[0086] The LCD panel 001 can be fixedly connected to the backlight module 000 through the connecting layer 900. The connecting layer 900 can be made of a material with cushioning capacity, such as foam or rubber.

[0087] In this embodiment, the liquid crystal display panel 001 may include an array substrate 1100 and a color filter substrate 1300 disposed opposite to each other, and a liquid crystal layer 1200 located between the array substrate 1100 and the color filter substrate 1300. The array substrate 1100 is closer to the backlight module 000 than the color filter substrate 1300, that is, the backlight module 000 may be distributed on the side of the array substrate 1100 away from the color filter substrate 1300.

[0088] It should be noted that, since the liquid crystal molecules in the liquid crystal layer 1200 only have a modulating effect on polarized light, a first polarizer 1000 needs to be provided on the side of the array substrate 1100 facing away from the color filter substrate 1300, and a second polarizer 1400 needs to be provided on the side of the color filter substrate 1300 facing away from the array substrate 1100. Here, the polarization direction of the first polarizer 1000 can be perpendicular to the polarization direction of the second polarizer 1400.

[0089] In this configuration, the light emitted from the backlight module 000, after passing through the first polarizer 1000, can be converted into first polarized light by the first polarizer 1000. The array substrate 1100, the color filter substrate 1300, and the liquid crystal layer 1200 located between them can adjust the first polarized light.

[0090] For example, by adjusting the array substrate 1100, the color filter substrate 1300, and the liquid crystal layer 1200 located between them, the polarization direction of the first polarized light can be deflected to be parallel to the polarization direction of the second polarizer 1400, and this light can be transmitted through the second polarizer 1400.

[0091] For example, by adjusting the array substrate 1100, the color filter substrate 1300, and the liquid crystal layer 1200 located between them, the polarization direction of the first polarized light can be made perpendicular to the polarization direction of the second polarizer 1400, and this light cannot be transmitted through the second polarizer 1400.

[0092] Furthermore, since each pixel area in the liquid crystal display panel 001 can adjust the incoming light, the liquid crystal display panel 001 can display the corresponding image by adjusting the light in each pixel area.

[0093] It should be noted that in the second or third possible implementation of the second dimming film 500, that is, when all the second dimming parts 502 in the second dimming film 500 are located on the side of the second substrate 501 facing the light source component 200, the second dimming film 500 can be an independent optical film 300, or the first polarizer 1000 can be reused as the second dimming film 500.

[0094] Optionally, when the second dimming film 500 is an independent optical film 300, the second dimming film 500 is located on the side of the first dimming film 400 away from the light source component 200, and, as Figure 10 and Figure 11 As shown, the second dimming sheet 500 may further include an adhesive 504 located on the side of the second substrate 501 facing away from the second dimming part 502. For example, the adhesive may be OCA optical adhesive (Optically Clear Adhesive). Here, the second dimming sheet 500 can be bonded to the side of the first polarizer 1000 facing the light source component 200 via the adhesive. It should be noted that, in this case, the materials of the second substrate 501 and the second dimming part 502 in the second dimming sheet 500 may both include PET (Polyethylene Terephthalate) or TAC (Triacetyl Cellulose).

[0095] like Figure 1 and Figure 12 As shown, at least one of the multiple optical films 300 in the backlight module 000 is a third dimming film 600, and the third dimming film 600 is located on the side of the first dimming film 400 facing the light source component 200. The third dimming film 600 is installed inside the housing 100 of the backlight module 000. Here, the third dimming film 600 is the diffuser in the backlight module 000.

[0096] Please refer to Figure 13 , Figure 13This is a top view of a third dimming sheet provided in an embodiment of this application. The third dimming sheet 600 may include: a main body portion 601, and a plurality of protruding structures 602 fixedly connected to the outer edge of the main body portion 601. Here, the plurality of protruding structures 602 are used to be attached to the outer casing 100.

[0097] The main body 601 of the third dimming sheet 600 has a light-transmitting area 6011 and a screen-printed light-shielding area 6012 located around the light-transmitting area 6011. The screen-printed light-shielding area 6012 is located on the side of the third dimming sheet 600 away from the light source component 200. The width d1 of the area adjacent to the convex structure 602 in the screen-printed light-shielding area 6012 is smaller than the width d2 of other areas.

[0098] For example, the third dimming plate 600 may have a first side 600a adjacent to the first folded edge 1021, a second side 600b adjacent to the second folded edge 1022, a third side 600c adjacent to the third folded edge 1023, and a fourth side 600d adjacent to the fourth folded edge 1024. When the lamp strip 201 in the light source component 200 is located on the side of the housing 100 facing the light guide plate 202 from the third folded edge 1023, the first side 600a, second side 600b, and fourth side 600d of the third dimming plate 600 may have multiple protruding structures 602. For example, as... Figure 13 As shown, the first side 600a of the third dimming sheet 600 may have two convex structures 602, and the two convex structures 602 may be symmetrically distributed about the center line L2 of the third dimming sheet 600 in the second direction Y. The second side 600b of the third dimming sheet 600 may have two convex structures 602, and the two convex structures 602 may be symmetrically distributed about the center line L2 of the third dimming sheet 600 in the second direction Y. The fourth side 600d of the third dimming sheet 600 may have two convex structures 602, and the two convex structures 602 may be symmetrically distributed about the center line L1 of the third dimming sheet 600 in the first direction X. The two convex structures 602 of the first side 600a and the two convex structures 602 of the second side 600b may correspond one-to-one, and may be symmetrical about the corresponding center line L1 of the third dimming sheet 600 in the first direction X. In this way, the firmness of the connection between the third dimming sheet 600 and the housing 100 can be guaranteed.

[0099] It should be noted that the above is only an illustrative illustration, and the embodiments of this application do not impose any restrictions on the number and position of the protruding structures 602 in the third dimming film 600.

[0100] It should also be noted that the first dimming sheet 400 may also have multiple protruding structures for attaching to the housing 100. For example, the multiple protruding structures of the first dimming sheet 400 may correspond to the multiple protruding structures 602 of the third dimming sheet 600. Accordingly, as... Figure 14 As shown, Figure 14 This is a top view of a housing provided in an embodiment of this application. The annular folded edge 102 of the housing 100 may have multiple grooves 102a. The multiple grooves 102a correspond to multiple convex structures of the first dimming sheet 400 and to multiple convex structures 602 of the third dimming sheet 600.

[0101] Please refer to Figure 15 and Figure 16 , Figure 15 The backlight module provided in the embodiments of this application is in Figure 13 A cross-sectional schematic diagram at CC' in the middle can also be regarded as the backlight module provided in the embodiments of this application. Figure 14 A schematic diagram of a cross-section at point CC'. Figure 16 The backlight module provided in the embodiments of this application is in Figure 13 A cross-sectional schematic diagram at DD' in the middle can also be regarded as the backlight module provided in the embodiments of this application. Figure 14 A cross-sectional schematic diagram at point DD'. Since the first side 600a, the second side 600b, the third side 600c, and the fourth side 600d of the third dimming plate 600 can all reflect light, some of the light emitted from the edge of the light guide plate 202 can be reflected by the side of the third dimming plate 600 facing the housing 100. This portion of light can be used to enhance the brightness at the edge of the display area 00a. However, since the third dimming sheet 600 has multiple convex structures 602, the distance d5 between the area corresponding to the convex structure 602 on the side of the third dimming sheet 600 facing the housing 100 and the boundary of the display area 00a is greater than the distance d6 between other areas on the side of the third dimming sheet 600 facing the housing 100 and the boundary of the display area 00a. Therefore, the brightness enhancement effect of the light reflected from the area corresponding to the convex structure 602 on the side of the third dimming sheet 600 facing the housing 100 on the edge of the display area 00a is less than the brightness enhancement effect of the light reflected from other areas on the side of the third dimming sheet 600 facing the housing 100 on the edge of the display area 00a. As a result, when the display device 002 is displayed, the brightness of the area corresponding to the convex structure 602 at the edge of the display device 002 is darker, resulting in shadows.

[0102] In this embodiment, the width d1 of the region adjacent to the convex structure 602 in the screen-printed light-shielding area 6012 of the third dimming sheet 600 is smaller than the width d2 of the other regions. Furthermore, the side of the region adjacent to the convex structure 602 in the screen-printed light-shielding area 6012 of the third dimming sheet 600 facing the light-transmitting area 6011 is flush with the side of the other regions in the screen-printed light-shielding area 6012 facing the light-transmitting area 6011. For example, the width d1 of the region adjacent to the convex structure 602 in the screen-printed light-shielding area 6012 can be 0.5 mm, and the width d2 of the other regions in the screen-printed light-shielding area 6012 can be 0.8 mm.

[0103] Since the screen-printed light-blocking area 6012 can absorb light and reduce the edge brightness of the display device 002, the wider the screen-printed light-blocking area 6012, the more obvious the brightness reduction effect. Therefore, when the width d1 of the area adjacent to the convex structure 602 in the screen-printed light-blocking area 6012 of the third dimming sheet 600 is smaller than the width d2 of other areas, the brightness reduction effect of the area adjacent to the convex structure 602 in the screen-printed light-blocking area 6012 of the third dimming sheet 600 is smaller, while the brightness reduction effect of other areas in the screen-printed light-blocking area 6012 of the third dimming sheet 600 is larger. In this way, the brightness at the edge of the display device 002 can be more uniform, thereby avoiding obvious shadows at the position corresponding to the convex structure 602 when the display device 002 is displayed, and improving the display effect of the display device 002.

[0104] Please refer to Figure 17 , Figure 17 The backlight module provided in the embodiments of this application is in Figure 13 A cross-sectional view at EE' shows that the light strip 201 may include a driving backplate 2011 and a plurality of LEDs 2012 located on one side of the driving backplate 2011. The light guide plate 202, the third dimming strip 600, and the first dimming strip 400 may be stacked, with the side of the third dimming strip 600 facing the light strip 201 protruding beyond the side of the light guide plate 202 facing the light strip 201, and the side of the light guide plate 202 facing the light strip 201 protruding beyond the side of the first dimming strip 400 facing the light strip 201. For example, the distance d3 between the side of the third dimming strip 600 facing the light strip 201 and the side of the light guide plate 202 facing the light strip 201 may be 0.5 mm, and the distance d4 between the side of the light guide plate 202 facing the light strip 201 and the side of the first dimming strip 400 facing the light strip 201 may be 0.8 mm.

[0105] In this way, the distance between the third folded edge 1023 and the third dimming plate 600 is small, and the edge of the third dimming plate 600 has a screen-printed light-shielding area 6012, which can reduce the probability that the light emitted by the lamp bead 2012 will be directly emitted through the gap between the housing 100 and the optical film 300. Even if some light is emitted through the gap between the third dimming plate 600 and the third folded edge 1023, the large distance between the third folded edge 1023 and the first dimming plate 400 can prevent this part of the light from shining towards the side of the first dimming plate 400 facing the third folded edge 1023, thereby preventing the light from converging and avoiding obvious light shadows on the lamp strip 201 side of the backlight module 000 when the display device 002 is displaying, improving the uniformity of light emitted by the backlight module 000 and improving the display effect of the display device 002.

[0106] In summary, this application provides a backlight module, including: a housing, a light source component, and optical films. The optical films are located on the light-emitting side of the light source component, and at least one of the optical films is a first dimming film. After the multiple first dimming units in the first dimming film adjust the incident light, the brightness of the light emitted from the backlight module gradually decreases from a direction with an emission angle of 50 degrees to a direction with an emission angle of 70 degrees in the vertical field of view. In this case, obvious bright and dark area boundaries can be avoided when the display device is displaying the image at a wide viewing angle, thereby improving the display effect of the display device.

[0107] like Figure 12 As shown in the illustration, this application also provides a display device 002, which can be any product or component with display function, such as a mobile phone, tablet computer, television, advertising machine, display screen, digital photo frame, etc. The display device 002 may include: a liquid crystal display panel 001 and a backlight module 000. The backlight module 000 is any of the backlight modules 000 given above.

[0108] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0109] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0110] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a light source component and a plurality of optical films located on the light emitting side of the light source component; at least one of the plurality of optical films is a first light adjusting film; the first light adjusting film comprises a first substrate and a plurality of first light adjusting portions located on the side of the first substrate away from the light source component; wherein the plurality of first light adjusting portions are used to adjust the incident light so that the luminance of the light rays of a first view angle emitted by the backlight module is greater than or equal to the luminance of the light rays of a second view angle within the vertical field of view angle of the backlight module; wherein the light rays of the first view angle have an emission angle smaller than the emission angle of the light rays of the second view angle, and the emission angles of the light rays of the first view angle and the light rays of the second view angle are both within the range of 50 degrees to 70 degrees.

2. The backlight module of claim 1, wherein, For any one of the first light adjusting portions in the first light adjusting film, the first light adjusting portion is a prism structure protruding outward relative to the first substrate, and the first light adjusting portion is in a strip shape; the first light adjusting portion has two first side surfaces oppositely arranged in a direction perpendicular to the extension direction of the first light adjusting portion; the two first side surfaces are connected on the side away from the first substrate, and the included angle between the two first side surfaces ranges from 95 degrees to 98 degrees.

3. The backlight module of claim 2, wherein, The included angle between the two first side surfaces is 96 degrees.

4. The backlight module of claim 1, wherein, For any one of the first light adjusting portions in the first light adjusting film, the first light adjusting portion is a prism structure protruding outward relative to the first substrate, and the first light adjusting portion is in a strip shape; the first light adjusting portion has a second side surface and a third side surface oppositely arranged in a direction perpendicular to the extension direction of the first light adjusting portion, and a first connecting surface parallel to the first substrate; the side of the second side surface away from the first substrate and the side of the third side surface away from the first substrate are connected through the first connecting surface.

5. The backlight module of any one of claims 1 to 4, wherein, The first light adjusting film further comprises an adhesive film located on the side of the first substrate away from the plurality of first light adjusting portions; the adhesive film contains particles, and the haze of the adhesive film is 36% to 45%.

6. The backlight module of any one of claims 1 to 4, wherein, At least one of the plurality of optical films of the backlight module is a second light adjusting film, and the second light adjusting film is located on the side of the first light adjusting film away from the light source component; the second light adjusting film comprises a second substrate and a plurality of second light adjusting portions; For any one of the second light adjusting portions in the second light adjusting film, the second light adjusting portion is in a strip shape, the second light adjusting portion is located on the side of the second substrate away from the light source component, and the second light adjusting portion is a concave structure recessed inward relative to the second substrate, or the second light adjusting portion is located on the side of the second substrate facing the light source component, and the second light adjusting portion is a prism structure protruding outward relative to the second substrate.

7. The backlight module of claim 6, wherein, In the case that the second light adjusting part is located on the side of the second base facing the light source part, and the second light adjusting part is a prism structure protruding outward relative to the second base, the second light adjusting part has two fourth side surfaces oppositely arranged in a direction perpendicular to the extending direction of the second light adjusting part, and the two fourth side surfaces are connected on the side away from the second base; Alternatively, the second light adjusting part has a fifth side surface and a sixth side surface oppositely arranged in a direction perpendicular to the extending direction of the first light adjusting part, and a second connecting surface parallel to the second base, and the side of the fifth side surface away from the second base is connected to the side of the sixth side surface away from the second base through the second connecting surface.

8. The backlight module according to any one of claims 1 to 4, 7, wherein, The backlight module further comprises a housing, and the light source part and the plurality of optical films are mounted in the housing; At least one of the plurality of optical films of the backlight module is a third light adjusting film, and the third light adjusting film is located on the side of the first light adjusting film facing the light source part; The third light adjusting film comprises a main body part and a plurality of outward protruding structures fixedly connected to the outer edge of the main body part, and the plurality of outward protruding structures are used for hanging on the housing; The main body part has a light transmission area and a silk-screen light shielding area located on the periphery of the light transmission area, and the width of the area adjacent to the outward protruding structure in the silk-screen light shielding area is smaller than the width of other areas.

9. The backlight module of claim 8, wherein, The light source part comprises a light bar and a light guide plate, and the light emitting surface of the light bar faces the side surface of the light guide plate; The side of the third light adjusting film facing the light bar protrudes from the side of the light guide plate facing the light bar, and the side of the light guide plate facing the light bar protrudes from the side of the first light adjusting film facing the light bar.

10. A display device, characterized by comprising: The backlight module comprises: A liquid crystal display panel and a backlight module, and the backlight module is any one of the backlight modules according to claims 1-9.

Images