Backlight module and display terminal

Abstract

The invention relates to a backlight module and a display terminal. The backlight module comprises a back plate and an optical film. The back plate is provided with a containing cavity, a limiting structure is arranged in the containing cavity, and limiting grooves are formed in the surfaces of the sides, away from the bottom plate, of the side plates. The optical film comprises a main body part, the main body part is arranged in the accommodating cavity, the main body part comprises a hanging lug, and the hanging lug is configured to be matched with the limiting structure to position the optical film; the optical film comprises a lug leading part connected to the hanging lug, and the lug leading part is arranged in the limiting groove. The lug part of the optical film is arranged in the limiting groove, the limiting groove limits the lug part to move towards the side close to the containing cavity, the lug part is connected with the hanging lug, and when the hanging lug is broken in the mechanical vibration impact process, the lug part can limit the hanging lug to move into the containing cavity. And the undesirable phenomena of shadow and the like in the window area of the backlight module after the hanging lug enters the accommodating cavity are prevented.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a backlight module and a display terminal. Background Art

[0002] A liquid crystal display module includes a display panel and a backlight module. The backlight module includes a back plate and multiple optical films fixed inside the back plate. Currently, in order to improve the mechanical vibration tolerance of the liquid crystal display module in harsh environments to adapt to application scenarios such as in-vehicle use, the mechanical vibration standards for liquid crystal display modules are becoming increasingly stringent. Under this requirement, some structures of the optical films are prone to breakage risks, such as ear tabs. When the ear tabs break and enter the viewing area, it will cause adverse phenomena such as shadows in the light-emitting area.

[0003] Therefore, it is urgent to solve the above technical problems. Summary of the Invention

[0004] Embodiments of this application provide a backlight module and a display terminal to improve the technical problem that the optical film is prone to breakage risks during mechanical vibration tests in harsh environments, and the broken film material enters the viewing area, resulting in adverse phenomena such as shadows in the viewing area.

[0005] To achieve the above objective, according to the first aspect of this application, a backlight module is provided, including:

[0006] A back plate, including a bottom plate and side plates disposed around the bottom plate. The bottom plate and the side plates form a receiving cavity, and a limiting structure is disposed in the receiving cavity. A limiting groove is disposed on a surface of the side plate facing away from the bottom plate;

[0007] At least one optical film, including a main body portion disposed in the receiving cavity. The main body portion includes an ear tab, and the ear tab is configured to cooperate with the limiting structure to position the optical film;

[0008] Wherein, the optical film includes a leading ear portion connected to the ear tab, and the leading ear portion is disposed in the limiting groove.

[0009] Optionally, a bearing structure is disposed in the receiving cavity, the optical film is disposed on a side of the bearing structure facing away from the bottom plate, the limiting structure is disposed on a surface of the bearing structure facing away from the bottom plate, and an opening is disposed on the main body portion. The limiting structure is matched with the opening;

[0010] Wherein, the ear tab is disposed at an edge of the opening.

[0011] Optionally, the main body portion includes an adjacent first side and a second side, the opening faces the first side, the leading ear portion is connected to the second side, and the ear tab is located at the junction of the first side and the second side.

[0012] Optionally, in a direction parallel to the first side, the distance between the limiting structure and the ear is less than the distance between the leading portion and the side wall of the limiting groove; and / or, in a direction parallel to the second side, the distance between the edge of the opening and the limiting structure is less than the distance between the leading portion and the side wall of the limiting groove.

[0013] Optionally, the leading portion includes a first sub-portion and a second sub-portion, and the second sub-portion is located at an end of the first sub-portion away from the ear.

[0014] In a direction parallel to the second side, the width of the second sub-portion is greater than the width of the first sub-portion.

[0015] Optionally, in a direction parallel to the first side, the length of the middle region of the second sub-portion is greater than the length of the edge region of the second sub-portion.

[0016] Optionally, the backlight module includes a window area and a non-window area located outside the window area.

[0017] Wherein, the minimum distance between the second side and the window area is greater than the minimum distance between the first side and the window area.

[0018] Optionally, the carrier structure is a light guide plate, the limiting structure is integrally provided with the light guide plate, and the height of the limiting structure is greater than or equal to the thickness of the optical film.

[0019] Optionally, the backlight module includes a plurality of the optical films, and at least one of the plurality of optical films includes the leading portion.

[0020] According to a second aspect of the present application, there is provided a display terminal including the above-mentioned backlight module.

[0021] In the backlight module of the embodiment of the present application, the leading portion of the optical film is disposed in the limiting groove, and the limiting groove restricts the leading portion from moving towards the side close to the accommodation cavity. The leading portion is connected to the ear. When the ear breaks during mechanical vibration and impact, the leading portion can restrict the ear from moving into the accommodation cavity, preventing the window area of the backlight module from appearing with shadow and other bad phenomena after the ear enters the accommodation cavity.

[0022] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0024] To more fully understand the present application and its beneficial effects, the following will be described in conjunction with the accompanying drawings, where the same reference numerals in the following description represent the same parts.

[0025] Figure 1 It is a top view structural schematic diagram of a backlight module provided in an exemplary embodiment of the present disclosure;

[0026] Figure 2 is Figure 1 an enlarged structural schematic diagram at position B in;

[0027] Figure 3 is Figure 1 another enlarged structural schematic diagram at position B in;

[0028] Figure 4A It is a photo of a backlight module showing a shadow defect phenomenon caused by a latching ear breaking and entering the window area in the related art;

[0029] Figure 4B is Figure 2 a schematic diagram after the latching ear in is broken;

[0030] Figure 5 is Figure 2 a cross-sectional structural schematic diagram at C-C in;

[0031] Figure 6 It is a structural schematic diagram of a display terminal provided in an exemplary embodiment of the present disclosure.

[0032] Explanation of reference numerals:

[0033] 1 - Backlight module; VA - Window area; NA - Non-window area;

[0034] 10 - Back plate; 11 - Bottom plate; 12 - Side plate; 12a - Limiting groove; 10a - Accommodating cavity;

[0035] 20 - Limiting structure;

[0036] 30 - Optical film; 31 - Main body; 31a - Opening; 311 - Latching ear; 32 - Lead ear; 321 - First sub-part; 322 - Second sub-part; 301a - First side; 302a - Second side;

[0037] 40 - Carrying structure; 41 - Light guide plate;

[0038] W1 - The distance between the lead ear part 32 and the side wall of the limit groove 12a in the direction parallel to the first side 301a;

[0039] L - The distance between the edge of the opening 31a and the limit structure 20 in the direction parallel to the second side 302a;

[0040] L1 - The distance between the first sub - part 321 and the side wall of the limit groove 12a in the direction parallel to the second side 302a;

[0041] L3 - The distance between the second sub - part 322 and the side wall of the limit groove 12a in the direction parallel to the second side 302a;

[0042] Lx - The width of the second sub - part 322; W - The width of the first sub - part 321; W2 - The length of the second sub - part 322 in the direction parallel to the first side 301a;

[0043] 2 - Display terminal; 3 - Liquid crystal panel. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0045] As Figure 1 、 Figure 2 and Figure 5 shown, a backlight module 1 is provided, including a backplane 10 and at least one optical film 30; the backplane 10 includes a bottom plate 11 and side plates 12 disposed around the bottom plate 11, the bottom plate 11 and the side plates 12 form a receiving cavity 10a, a limit structure 20 is disposed in the receiving cavity 10a, and a limit groove 12a is disposed on the surface of the side plate 12 facing away from the bottom plate 11; the optical film 30 includes a main body portion 31, the main body portion 31 is disposed in the receiving cavity 10a, the main body portion 31 includes a hanging ear 311, and the hanging ear 311 is configured to cooperate with the limit structure 20 to position the optical film 30; wherein, the optical film 30 includes a lead ear part 32 connected to the hanging ear 311, and the lead ear part 32 is disposed in the limit groove 12a.

[0046] The backlight module 1 can be used to provide a backlight source for the liquid crystal panel 3. The liquid crystal panel 3 and the backlight module 1 are combined to form a liquid crystal display module.

[0047] As Figure 1 and Figure 5As shown, the backplane 10 includes a bottom plate 11 and side plates 12. The side plates 12 are connected to the edges of the bottom plate 11, and the bottom plate 11 and the side plates 12 form a box-shaped structure, and an accommodation cavity 10a is formed inside the box-shaped structure. A limiting groove 12a is provided on the upper surface of the side plate 12, and the depth of the limiting groove 12a is less than the height of the side plate 12. The depth of the limiting groove 12a and the height of the side plate 12 both refer to the dimensions in the thickness direction of the backlight module 1, and the thickness direction of the backlight module 1 is perpendicular to the light-emitting surface direction of the backlight module 1.

[0048] In some embodiments, the material of the backplane 10 is metal, such as aluminum, etc. The backplane 10 can be a die-cast part.

[0049] The optical film 30 can be one or a combination of a diffusion film, a brightness enhancement film (BEF), an advanced light control film (ALCF), etc. The diffusion film is used to diffuse the light emitted by the backlight source, make the light uniform, reduce the brightness non-uniformity phenomenon caused by uneven light source distribution or optical elements, and improve the light-emitting uniformity of the entire backlight module 1.

[0050] The brightness enhancement film uses the refraction and total reflection principles of prisms to converge the light within a specific angular range and improve the brightness in the front view direction of the backlight module 1.

[0051] The advanced light control film is based on ultra-fine louver optical technology, and realizes the control of the light angle through a grating structure (louver) arranged in parallel, changes the wide viewing angle of the backlight module 1 into a narrow viewing angle, so as to achieve the purposes of anti-peeping, controlling reflected light and improving the display contrast of the display module.

[0052] Such as Figure 1 、 Figure 2 and Figure 5 As shown, the main body portion 31 is disposed in the accommodation cavity 10a. The middle area of the main body portion 31 is the window area VA, that is, the effective area in the backlight module 1 for providing a backlight source for the display panel. The area other than the window area VA is the non-window area NA, and the edge area of the main body portion 31, the side plate 12, etc. are all located in the non-window area NA.

[0053] The main body part 31 includes hanging ears 311 which are used to position the optical film 30 in the direction parallel to the light-emitting surface, where the light-emitting surface is parallel to one side surface of the bottom plate 11 close to the optical film 30. A limiting structure 20 is arranged in the accommodating cavity 10a, and the hanging ears 311 cooperate with the limiting structure 20 to limit the movement of the optical film 30 in the accommodating cavity 10a. It should be noted that within the allowable range of process errors, there may be a gap between the limiting structure 20 and the hanging ears 311. For example, the gap can be 0.2 mm, etc. The size of the gap is determined based on process errors, etc. That is to say, the optical film 30 can move slightly within the allowable range of process errors.

[0054] The limiting structure 20 can be a limiting post or the like, but is not limited thereto.

[0055] The optical film 30 includes an ear portion 32 which is connected to the hanging ears 311. For example, in some embodiments, the ear portion 32 and the hanging ears 311 are integrally provided. The ear portion 32 is accommodated in the limiting groove 12a, and the shape of the ear portion 32 can be adapted to the shape of the limiting groove 12a, so that the limiting groove 12a restricts the movement of the ear portion 32 towards the side close to the accommodating cavity 10a. It should be noted that similarly, based on process errors, a gap can be provided between the limiting groove 12a and the ear portion 32. The size of the gap is determined based on process errors, etc. That is to say, the ear portion 32 can move slightly in the limiting groove 12a within the allowable range of process errors.

[0056] When the backlight module 1 is subjected to mechanical vibration and impact, in extreme cases, the hanging ears 311 may break. The broken hanging ears 311 may enter the window area VA during vibration, as Figure 4A shown. The hanging ears 311 entering the window area VA will cause a shadow in the window area VA, as shown by the black dotted line box at D, affecting the light-emitting effect of the backlight module 1.

[0057] In the embodiments of the present application, please refer to Figure 4B , by connecting the hanging ears 311 and the ear portion 32, and the ear portion 32 is limited by the limiting groove 12a, even if the hanging ears 311 break, the ear portion 32 can pull the hanging ears 311 to prevent the hanging ears 311 from moving to the window area VA and affecting the light-emitting effect of the backlight module 1. When the hanging ears 311 are in the non-window area NA, it will not affect the light-emitting effect of the backlight module 1, thus avoiding the problem of shadow defects in the backlight module 1 caused by the breakage of the hanging ears 311.

[0058] Optionally, as Figure 2 and Figure 5As shown, a carrying structure 40 is provided in the accommodation cavity 10a. The optical film 30 is disposed on a side of the carrying structure 40 facing away from the bottom plate 11. The limiting structure 20 is disposed on a surface of the carrying structure 40 facing away from the bottom plate 11. The main body portion 31 is provided with an opening 31a, and the limiting structure 20 is matched with the opening 31a. Among them, the lug 311 is disposed at the edge of the opening 31a.

[0059] The backlight module 1 is used to convert the light emitted by the light source into a planar light source. The light source can be an LED (Light Emitting Diode), etc.

[0060] According to the position of the light source, the backlight module 1 can be divided into a side-entry type backlight and a direct-lit type backlight. In the side-entry type backlight, as Figure 2 and Figure 5 shown, the light source is located at the edge of the light guide plate 41, and the light emitted from the light source is incident on the side wall of the light guide plate 41. The optical film 30 is stacked on the light guide plate 41. That is to say, in the side-entry type backlight, the carrying structure 40 can be the light guide plate 41. The limiting structure 20 can be disposed on a surface of the light guide plate 41 facing away from the bottom plate 11, that is, the limiting structure 20 protrudes from the upper surface of the light guide plate 41. The main body portion 31 is provided with an opening 31a, the limiting structure 20 is received in the opening 31a, and the lug 311 is located at the edge of the opening 31a. Since the lug 311 is located at the edge of the opening 31a, during mechanical vibration impact, the lug 311 is a weak area, and the lug 311 is easily broken away from the rest along the edge of the opening 31a.

[0061] The light guide plate 41 is used to efficiently guide and propagate the light emitted by the light source to the entire window area VA. Usually, there are some special structures or patterns on the surface or inside of the light guide plate 41, such as microstructures, dot patterns, etc. These structures cause the light to scatter and reflect during the propagation process, so that the light originally concentrated near the light source is evenly dispersed to the entire surface of the light guide plate 41, and then a relatively uniform backlight source is formed.

[0062] In the direct-lit type backlight, multiple light sources are distributed on the bottom plate 11, and the light emitted from the light sources is directly incident on the optical film 30, omitting the light guide plate 41. The carrying structure 40 can be disposed on the side plate 12, and the carrying structure 40 extends into the accommodation cavity 10a for carrying the optical film 30. There is a certain distance between the optical film 30 and the light source, so as to achieve light mixing.

[0063] In some embodiments, the carrying structure 40 can be integrally provided with the side plate 12.

[0064] In some other embodiments, the carrying structure 40 can be detachably connected to the side plate 12.

[0065] In some embodiments, the backlight module 1 further includes a reflector. In edge-lit backlighting, the reflector is disposed on a side of the light guide plate 41 close to the bottom plate 11. The reflector can reflect the light that is originally emitted from the lower surface of the light guide plate 41 and lost to the light-emitting surface, thereby improving the light-emitting efficiency of the entire backlight module 1 and enhancing the brightness of the backlight module 1. In direct-lit backlighting, the reflector can be disposed on the bottom plate 11 and at least between two adjacent light sources, so as to reflect the light incident on one side of the bottom plate 11 by the light sources.

[0066] Optionally, as Figure 1 and Figure 2 shown, the main body portion 31 includes adjacent first side 301a and second side 302a, the opening 31a faces the first side 301a, the ear portion 32 is connected to the second side 302a, and the lug 311 is located at the junction of the first side 301a and the second side 302a.

[0067] The outer shape structure of the main body portion 31 is generally rectangular. The first side 301a and the second side 302a are two adjacent sides of the rectangle, and the lug 311 is located at the corner of the rectangle.

[0068] As Figure 2 shown, the opening 31a faces the first side 301a, that is to say, the opening 31a is recessed into the interior of the optical film 30 relative to the first side 301a. The limiting structure 20 is received in the opening 31a, and the limiting structure 20 restricts the movement of the optical film 30 in a plane parallel to the light-emitting surface.

[0069] As Figure 2 shown, a part of the edge of the opening 31a at the angle with the first side 301a and the second side 302a forms the lug 311. The ear portion 32 is connected to the second side 302a, that is to say, one side of the lug 311 that coincides with the second side 302a is connected to the ear portion 32. It should be noted that the ear portion 32 and the lug 311 are integrally provided, and there is no obvious dividing line between them.

[0070] Optionally, as Figure 3 shown, Figure 3 The difference from Figure 2 lies in the shape of the ear portion 32. In the direction parallel to the first side 301a, the distance between the limiting structure 20 and the lug 311 is less than the distance W1 between the ear portion 32 and the side wall of the limiting groove 12a; and / or, in the direction parallel to the second side 302a, the distance L between the edge of the opening 31a and the limiting structure 20 is less than the distance L1 between the ear portion 32 and the side wall of the limiting groove 12a. Among them, the direction parallel to the first side 301a is the D2 direction in Figure 3 , and the direction parallel to the second side 302a is the D1 direction in Figure 3 .

[0071] In the direction parallel to the first side 301a, the distance between the limiting structure 20 and the lug 311 is less than the distance W1 between the leading portion 32 and the side wall of the limiting groove 12a. With the above arrangement, when the optical film 30 vibrates in the accommodating cavity 10a, the distance between the lug 311 and the limiting structure 20 is relatively small, so the lug is stressed first and the leading portion 32 is not stressed, thereby preventing the leading portion 32 from breaking before the lug 311 and failing to perform the function of limiting the lug 311 outside the window area VA.

[0072] In some embodiments, in the direction parallel to the first side 301a, the distance between the limiting structure 20 and the lug 311 can be greater than zero and greater than or equal to 0.1 mm. The distance W1 between the leading portion 32 and the side wall of the limiting groove 12a is greater than or equal to 0.2 mm.

[0073] In some embodiments, in the direction parallel to the second side 302a, the distance L between the edge of the opening 31a and the limiting structure 20 can be a first distance. The size of the first distance can be determined according to the expansion gap, machining tolerance, assembly tolerance, etc. of the optical film 30.

[0074] In the direction parallel to the second side 302a, the distance L1 between the leading portion 32 and the side wall of the limiting groove 12a is greater than the first distance, that is, L1 > L. With the above arrangement, when the optical film 30 vibrates in the accommodating cavity 10a, the distance between the lug 311 and the limiting structure 20 is relatively small, so the lug is stressed first and the leading portion 32 is not stressed, which can prevent the leading portion 32 from breaking before the lug 311 and failing to perform the function of limiting the lug 311 outside the window area VA. For example, the difference between the distances L1, L3 between the leading portion 32 and the side wall of the limiting groove 12a and the first distance is 0.2 mm to 0.4 mm, etc. When the size of the leading portion 32 is larger, a larger expansion gap needs to be reserved. That is to say, when the size of the leading portion 32 in the direction parallel to the second side 302a is larger, the distances L1, L3 between the leading portion 32 and the side wall of the limiting groove 12a are also larger.

[0075] As Figure 3 shown, in some embodiments, L1 = L + 0.2 mm, L2 = L1 + 0.2 mm, L3 = L1 + 0.2 mm.

[0076] Optionally, as Figure 3 shown, the leading portion 32 includes a first sub-portion 321 and a second sub-portion 322, and the second sub-portion 322 is located at one end of the first sub-portion 321 away from the lug 311; in the direction parallel to the second side 302a, the width Lx of the second sub-portion 322 is greater than the width W of the first sub-portion 321.

[0077] In a direction parallel to the second side 302a, the width W of the first sub - part 321 can be greater than or equal to 1.2 millimeters. The width W of the first sub - part 321 can be determined according to the process capabilities. For example, when using a cutting process to fabricate the optical film 30, the process tolerance is determined according to the cutting ability of the equipment and the processing error.

[0078] In a direction parallel to the second side 302a, the width Lx of the second sub - part 322 is greater than the width W of the first sub - part 321. As Figure 3 shown, Lx = W + 2*(L1 + L2), where L2 is the distance between the second sub - part 322 and the first sub - groove.

[0079] It should be noted that the size of the limiting groove 12a is adapted to the size of the ear - like part 32. For example, the part of the limiting groove 12a corresponding to the first sub - part 321 is the first sub - groove, and the part corresponding to the second sub - part 322 is the second sub - groove. In a direction parallel to the second side 302a, the width of the second sub - groove is greater than the width Lx of the second sub - part 322, and the width of the first sub - groove is greater than the width W of the first sub - part 321. In a direction parallel to the first side 301a, the length of the second sub - groove is greater than the length W2 of the second sub - part 322, and the length of the first sub - groove is less than the length of the first sub - part 321.

[0080] In some embodiments, as Figure 3 shown, the width of the first sub - groove is W + 2*L1; the width of the second sub - groove is Lx + 2*L3.

[0081] In some embodiments, the expansion gap of the optical film 30 can be set to 0.2 millimeters, but is not limited thereto.

[0082] In a direction parallel to the first side 301a, the length of the first sub - part 321 can be set as needed.

[0083] Optionally, as Figure 2 and Figure 3 shown, in a direction parallel to the first side 301a, the length of the middle region of the second sub - part 322 is greater than the length of the edge region of the second sub - part 322.

[0084] The middle region of the second sub - part 322 is connected to the first sub - part 321, and the edge region of the second sub - part 322 is connected to the middle region of the second sub - part 322. That is to say, in a direction parallel to the first side 301a, the length of the middle region of the second sub - part 322 is larger, and the length of the edge region of the second sub - part 322 is smaller. Through the above - mentioned setting, when the optical film 30 is subjected to mechanical vibration shock, the internal stress between the first sub - part 321 and the second sub - part 322 is smaller, and it can be avoided that the first sub - part 321 and the second sub - part 322 are torn from the connection part (such as the corner).

[0085] In some embodiments, as Figure 2 shown, the side length of the second sub - part 322 away from the first sub - part 321 is arc - shaped. By setting the side length of the second sub - part 322 away from the first sub - part 321 as arc - shaped, it is possible to prevent the middle region and the edge region of the second sub - part 322 from being torn by internal stress. For example, the length of the arc can be 1.2*Lx, but is not limited thereto.

[0086] In other embodiments, as Figure 3 shown, the side length of the second sub - part 322 away from the first sub - part 321 is a connection of multiple straight - line segments. For example, the side length of the second sub - part 322 away from the first sub - part 321 is the connection of three straight - line segments. The middle straight - line segment corresponds to the first sub - part 321, and the included angle between the edge straight - line segment and the middle straight - line segment is an obtuse angle. By setting one end of the second sub - part 322 away from the first sub - part 321 as a trapezoidal shape, it is possible to prevent the middle region and the edge region of the second sub - part 322 from being torn by internal stress.

[0087] Optionally, as Figure 2 shown, the backlight module 1 includes a window area VA and a non - window area NA located outside the window area VA; wherein, the minimum distance between the second side 302a and the window area VA is greater than the minimum distance between the first side 301a and the window area VA.

[0088] The minimum distance between the second side 302a and the window area VA is greater than the minimum distance between the first side 301a and the window area VA. That is to say, the first side 301a can correspond to the left and right side frames of the backlight module 1, and the second side 302a can correspond to the lower side frame of the backlight module 1. The minimum distance between the second side 302a and the window area VA is the width of the lower side frame of the backlight module 1, and the minimum distance between the first side 301a and the window area VA is the width of the left and right side frames of the backlight module 1.

[0089] The lower side frame of the backlight module 1 corresponds to the lower side frame of the display panel. Since structures such as bonding parts are usually arranged at the lower side frame of the display panel, the width of the lower side frame of the display panel is greater than the width of the left and right side frames of the display panel. The bonding part is used for bonding connection with bonding components such as a driving chip, a flip - chip film, a flexible circuit board, etc.

[0090] The window area VA of the backlight module 1 corresponds to the display area of the display panel, and the non - window area NA corresponds to the non - display area of the display panel. Therefore, the width of the lower side frame in the backlight module 1 is greater than the width of the left and right side frames in the backlight module 1. Since the width of the lower side frame in the backlight module 1 is relatively large, it can provide a accommodating space for the ear part 32 and the limiting groove 12a without increasing the width of the lower side frame.

[0091] Optionally, as Figure 5As shown, the carrier structure 40 is a light guide plate 41, the limiting structure 20 is integrally provided with the light guide plate 41, and the height of the limiting structure 20 is less than or equal to the thickness of the optical film 30.

[0092] The backlight module 1 can be a side-entry backlight. At this time, the carrier structure 40 can be a light guide plate 41, and the light guide plate 41 can be formed by an injection molding process. The limiting structure 20 is integrally provided with the light guide plate 41. Through the above settings, the processing technology of the backlight module 1 can be simplified.

[0093] In some embodiments, the height of the limiting structure 20 is greater than or equal to the thickness of the optical film 30.

[0094] It should be noted that when the number of the optical films 30 is multiple. The height of the limiting structure 20 is greater than or equal to the total thickness of the multiple optical films 30, so that the limiting structure 20 provides a limiting effect for each optical film 30.

[0095] Optionally, the backlight module 1 includes a plurality of optical films 30, and at least one of the plurality of optical films 30 includes an ear portion 32.

[0096] When the backlight module 1 includes a plurality of optical films 30, the optical film 30 with the largest thickness has the heaviest weight. When subjected to mechanical vibration impact, the degree of shaking is the most severe, and the hanging ear 311 is most likely to break. Therefore, the ear portion 32 can be provided on the optical film 30 with the largest thickness to reduce the risk of the hanging ear 311 entering the window area VA after breaking.

[0097] In some embodiments, the optical film 30 includes any one of materials such as polycarbonate (PC), polyethylene terephthalate (PET), etc.

[0098] Since among the optical films 30, the PET material has a high tensile strength, a small thermal expansion coefficient, and a strong ability to resist deformation. The optical film 30 made of PC material has a low tensile strength, a large thermal expansion coefficient, and a poor ability to resist deformation. During vibration, the risk of the optical film 30 made of PC material breaking is greater than that of the optical film 30 made of PET material. Therefore, the ear portion 32 can be preferentially provided on the optical film 30 made of PC material. The optical film 30 made of PET material can selectively be provided with the ear portion 32.

[0099] That is to say, when two optical films 30 have different elastic moduli, the ear portion 32 can be provided on the optical film 30 with the larger elastic modulus.

[0100] In some other embodiments, each optical film 30 is provided with an ear portion 32, so as to further reduce the risk of any optical film 30's hanging ear 311 entering the window area VA after breaking.

[0101] According to the second aspect of the present application, as Figure 6 shown, a display terminal 2 is provided, including the above-mentioned backlight module 1.

[0102] In this embodiment, as Figure 6 shown, the display terminal 2 includes a backlight module 1 and a liquid crystal panel 3, and the backlight module 1 and the liquid crystal panel 3 are combined into one body.

[0103] In this embodiment, the display terminal 2 can be: a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, an in-vehicle display screen, or any other product or component with a display function.

[0104] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0105] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0106] Among the embodiments, implementation manners and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0107] The above is only a preferred embodiment of the present application, and does not impose any form of limitation on the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that, Comprising: A back plate, including a bottom plate and side plates disposed around the periphery of the bottom plate. The bottom plate and the side plates form a receiving cavity, a limiting structure is disposed in the receiving cavity, and a limiting groove is disposed on a surface of the side plate facing away from the bottom plate; At least one optical film, including a main body portion disposed in the receiving cavity. The main body portion includes hanging ears configured to cooperate with the limiting structure to position the optical film; Wherein, the optical film includes an ear portion connected to the hanging ears, and the ear portion is disposed in the limiting groove.

2. The backlight module according to claim 1, wherein A carrying structure is disposed in the receiving cavity, the optical film is disposed on a side of the carrying structure facing away from the bottom plate, the limiting structure is disposed on a surface of the carrying structure facing away from the bottom plate, an opening is provided on the main body portion, and the limiting structure matches the opening; Wherein, the hanging ears are disposed at the edge of the opening.

3. The backlight module according to claim 2, wherein The main body portion includes an adjacent first side and a second side, the opening faces the first side, the ear portion is connected to the second side, and the hanging ears are located at the junction of the first side and the second side.

4. The backlight module according to claim 3, wherein In a direction parallel to the first side, the distance between the limiting structure and the hanging ears is less than the distance between the ear portion and the side wall of the limiting groove; and / or, in a direction parallel to the second side, the distance between the edge of the opening and the limiting structure is less than the distance between the ear portion and the side wall of the limiting groove.

5. The backlight module according to claim 4, wherein The ear portion includes a first sub-portion and a second sub-portion, and the second sub-portion is located at an end of the first sub-portion away from the hanging ears; In a direction parallel to the second side, the width of the second sub-portion is greater than the width of the first sub-portion.

6. The backlight module according to claim 5, wherein In a direction parallel to the first side, the length of the middle region of the second sub-portion is greater than the length of the edge region of the second sub-portion.

7. The backlight module according to claim 3, wherein, The backlight module includes a window area and a non-window area located outside the window area; Wherein, the minimum distance between the second side and the window area is greater than the minimum distance between the first side and the window area.

8. The backlight module according to any one of claims 2 to 7, characterized in that, The carrying structure is a light guide plate, the limiting structure is integrally provided with the light guide plate, and the height of the limiting structure is greater than or equal to the thickness of the optical film.

9. The backlight module according to any one of claims 1 to 7, characterized in that, The backlight module includes a plurality of the optical films, and at least one of the plurality of optical films includes the ear portion.

10. A display terminal, characterized in that, Including the backlight module according to any one of claims 1 to 9.

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