Backlight module and display module

Abstract

Embodiments of the present application provide a backlight module and a display module. The backlight module comprises a backboard, a light guide plate, at least one lamp strip and an optical film assembly. The backboard has a receiving cavity, and the light guide plate is located in the receiving cavity. The at least one lamp strip is located in the receiving cavity and opposite to the side wall of the light guide plate, and the light emitting direction of the lamp strip is towards the light guide plate. The lamp strip comprises a circuit substrate and a light emitting element, and each circuit substrate is provided with at least one hanging part. The optical film assembly is located on the light emitting side of the light guide plate, and the optical film assembly comprises a plurality of optical films stacked on the light emitting side of the light guide plate. At least one optical film close to the light guide plate is provided with a first lug matched with the hanging part to limit the optical film. The backlight module can solve the problem that the backlight module is difficult to limit the movement of the optical film on the side of the lamp strip due to the height limitation of the lamp strip.

Description

TECHNICAL FIELD

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

[0002] LCD (Liquid Crystal Display) has many advantages such as thin body, power saving, no radiation, etc., and has been widely applied. Most of the LCDs on the market are backlight type, which includes a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates, and to control the liquid crystal molecules to change direction by an electric circuit to refract the light of the backlight module to generate a picture. Since the liquid crystal panel itself does not emit light, it needs to rely on the light source provided by the backlight module to normally display images, and therefore the backlight module becomes one of the key components of the LCD.

[0003] The backlight module is divided into side-in backlight module and direct backlight module according to the different incident positions of the light source. Among them, the backlight source LED light bar of the side-in backlight module is generally arranged at the bottom or both sides of the optical film. No matter where the light bar is arranged, in order to ensure the picture quality and avoid reliability risks, the design needs to reserve a certain space for the position of the optical film in the backlight module. Due to the influence of gravity, the requirement for the up-down movement of the film material is much higher than that for the left-right movement. Therefore, the up-down movement of the film material is generally positioned at both sides of the optical film, and the left-right movement of the film material can be positioned at the top or bottom of the optical film.

[0004] At present, for the side-in backlight module, the positioning of this kind of optical film is difficult to be limited by the backlight module due to the position of the light bar. For example, the light bar is arranged at both sides of the optical film. Generally, a first lug is arranged at the upper and lower edges of the optical film, which needs to simultaneously consider the functions of limiting the left-right and up-down movements. For example, a hole can be punched on the first lug, which is sleeved on the positioning column reserved in the notch of the backlight module, or the structure of the backlight module can be changed, the notch of the backlight module is made into a concave structure, and the lug of the film material is made into a T-shaped structure and is clamped in the notch of the backlight module. Although the above common positioning methods solve the problem of limiting the movement of the film material in two directions, they increase the width of the frame of the backlight module, which is not conducive to the narrow frame of the backlight module. Therefore, a new light bar fixing method is needed, which can meet the limiting function without increasing the width of the frame of the backlight module. SUMMARY

[0005] The purpose of the embodiment of the present application is to provide a backlight module and a display module, which can solve the problem that the backlight module is difficult to limit the movement of the optical film by the backlight module due to the height of the light bar on the side where the light bar is installed. The specific technical solutions are as follows:

[0006] The first aspect of the present application provides a backlight module, comprising: a backboard having a receiving cavity; a light guide plate located in the receiving cavity; at least one light bar located in the receiving cavity and opposite to the sidewall of the light guide plate, the light emitting direction of the light bar being towards the light guide plate, the light bar comprising a circuit substrate and a light emitting element, each of the circuit substrates being provided with at least one hanging part; and an optical film assembly located on the light emitting side of the light guide plate, comprising a plurality of optical films stacked on the light emitting side of the light guide plate, at least one of the optical films located close to the light guide plate being provided with a first lug matched with the hanging part to limit the optical film.

[0007] In some embodiments, the backboard comprises a top side and a bottom side opposite to each other along a first direction, a first side and a second side opposite to each other along a second direction, the first direction and the second direction being parallel to the light emitting surface and perpendicular to each other; and the backlight module comprises two light bars, each of which is arranged on the inner side of the first side and the second side.

[0008] In some embodiments, the hanging part is arranged on one or both ends of the circuit substrate along the first direction, the hanging part being a first protrusion protruding upwards from the side of the circuit substrate parallel to the light emitting surface and close to the light emitting surface, and the first lug being arranged on the corner of the optical film, the first lug abutting against the first protrusion on one side along the width direction of the first lug and abutting against the inner side of the backboard on the other side.

[0009] In some embodiments, the hanging part is arranged on the middle part of the circuit substrate away from the ends, the hanging part being a second protrusion protruding upwards from the side of the circuit substrate parallel to the light emitting surface and close to the light emitting surface, each of the circuit substrates being provided with one second protrusion or at least one pair of second protrusions, and each pair of second protrusions having a first interval; the second protrusion being one, and the second protrusions on the two circuit substrates all abutting against the side of the first lug corresponding thereto towards the top side or the bottom side, or the second protrusion being a pair, and the first lug corresponding thereto extending into the first interval.

[0010] In some embodiments, the distance between the first protrusion and the second protrusion and the top surface of the backboard is greater than or equal to 2 mm and less than or equal to 4 mm.

[0011] In some embodiments, the hanging portion is arranged at a middle region of the circuit substrate away from the end portion, the hanging portion is a third protrusion protruding upward from a side of the circuit substrate parallel to and close to the light exit surface, each of the circuit substrates is provided with one third protrusion or at least one pair of third protrusions, and each pair of third protrusions has a second spacing therebetween; the third protrusions are provided in one of the following manners: one of the third protrusions on one of the circuit substrates abuts against a side of the first hanging ear facing the sky side, and the other third protrusion on the other circuit substrate abuts against a side of the first hanging ear facing the ground side, or the third protrusions are provided in a pair, and the first hanging ear corresponding to the third protrusions extends into the second spacing.

[0012] In some embodiments, the hanging portion is a fastening member arranged at a side of the circuit substrate parallel to and close to the light exit surface, and the first hanging ear is inserted into the fastening member.

[0013] In some embodiments, the fastening member is in the shape of a "mouth" character, a "U" shape, or an inverted "U" shape.

[0014] In some embodiments, the optical film is provided with at least one second hanging ear at a side corresponding to the sky side, the back plate is provided with a clamping portion at the sky side, and the second hanging ear cooperates with the clamping portion; and / or, a middle region of a side of the optical film corresponding to the ground side has a recess structure for avoiding a rubber frame, and the optical film located on both sides of the recess structure is clamped with the rubber frame.

[0015] In some embodiments, the back plate comprises a sky side and a ground side opposite to each other along a first direction, a first side and a second side opposite to each other along a second direction, the first direction and the second direction are parallel to the light exit surface and perpendicular to each other; the light bar is provided in one of the following manners: one light bar is arranged at an inner side of the ground side, or two light bars are arranged at the sky side and the ground side respectively; the hanging portion is arranged at one or both end portions of the circuit substrate along the first direction, the hanging portion is a first protrusion protruding upward from a side of the circuit substrate parallel to and close to the light exit surface, the first hanging ear is arranged at a corner of the optical film, and one side of the first hanging ear along its width direction abuts against the first protrusion, and the other side abuts against the inner side of the back plate.

[0016] The second aspect of the present application provides a display module, comprising a liquid crystal display panel and the backlight module described above; the liquid crystal display panel and the backlight module are arranged oppositely, and the backlight module provides a display light source for the liquid crystal display panel, so that the liquid crystal display panel displays an image.

[0017] The embodiments of the present application have the following beneficial effects:

[0018] The backlight module and the display module provided by the embodiment of the present application position the optical film by using the circuit substrate, without increasing the frame width of the circuit substrate and the back plate to shield special structures, so that the frame width can be easily kept small. Meanwhile, since the hanging part is arranged on the circuit substrate, the back plate does not need to be specially designed, so that the forming process of the back plate does not have any additional difficulty, which is beneficial to reduce the manufacturing difficulty and the manufacturing cost of the back plate. Moreover, the first hanging ear is only responsible for the positioning in one direction, so that the problem of mutual influence of the positioning accuracy in two directions does not exist, and the positioning accuracy is high. Meanwhile, the first hanging ear is only responsible for the positioning in one direction, so that the stress condition in the transportation or the vibration test is simple, and the first hanging ear is not easy to be damaged. Even if the first hanging ear is damaged, the positioning in the other direction is not affected, so that the picture defect risk is reduced to the minimum.

[0019] Of course, implementing any product or method of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art based on these drawings.

[0021] Figure 1 An explosion schematic view of the backlight module provided by the embodiment of the present application in one viewing angle;

[0022] Figure 2 An explosion schematic view of the backlight module provided by the embodiment of the present application in another viewing angle;

[0023] Figure 3 A structural schematic view of the back plate provided by the embodiment of the present application;

[0024] Figure 4 A structural schematic view of the backlight module provided by the embodiment of the present application without the glue frame;

[0025] Figure 5 A Figure 4 An enlarged schematic view of the B part in FIG. 8;

[0026] Figure 6 A structural schematic view of the first optical film provided by the embodiment of the present application;

[0027] Figure 7 A structural schematic view of the light bar provided by the embodiment of the present application in the first embodiment;

[0028] Figure 8A partial structural schematic diagram of the light strip provided in the embodiments of this application in a second embodiment;

[0029] Figure 9 A partial structural diagram of the light strip provided in the embodiments of this application in a third embodiment;

[0030] Figure 10 A partial structural schematic diagram of the light strip provided in the embodiments of this application in a fourth embodiment;

[0031] Figure 11 A partial structural diagram of the light strip provided in the fifth embodiment of this application;

[0032] Figure 12 A partial structural diagram of the light strip provided in the sixth embodiment of this application;

[0033] Figure 13 A partial structural schematic diagram of the light strip provided in the seventh embodiment of this application;

[0034] Figure 14 for Figure 4 An enlarged schematic diagram of section C;

[0035] Figure 15 for Figure 4 An enlarged schematic diagram of section D in the middle;

[0036] Figure 16 for Figure 3 An enlarged schematic diagram of part A in the middle.

[0037] The attached figures are labeled as follows:

[0038] Back plate 100; First side 101; Second side 102; Top side 103; Engaging part 1031; Ground side 104; Opening 105; Protrusion 106; Notch 107; Light guide plate 200; Light emitting side 201; Lamp strip 300; Circuit board 301; First protrusion 3011; Second protrusion 3012; First gap 30121; Third protrusion 3013; Fastener 3014; Light emitting element 302; First optical film 400; First hook 401; Second hook 402; Recessed structure 403; Protruding structure 404; Frame 500; Reflector 600; First direction X; Second direction Y. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of the present invention.

[0040] In order to solve the problem that it is difficult to limit the up and down movement of the optical film on the left and right sides of the backlight module by the back plate 100 when the lamp strip 300 is installed on the left and right sides of the backlight module, and it is also difficult to limit the left and right movement and the up and down movement on the upper and lower sides of the back plate 100 at the same time, and it is also difficult to achieve a narrow frame, the application provides a backlight module, as shown in Figure 1 、 Figure 2 The backlight module includes a back plate 100, a light guide plate 200, at least one lamp strip 300, and an optical film assembly. The back plate 100 has a receiving cavity, and the light guide plate 200 is located in the receiving cavity. The at least one lamp strip 300 is located in the receiving cavity and is opposite to the side wall of the light guide plate 200, and the light emitting direction of the lamp strip 300 is towards the light guide plate 200. The lamp strip 300 includes a circuit board 301 and a light emitting element 302, and the light emitting element 302 can be, for example, an LED lamp bead. Each circuit board 301 is provided with at least one hanging part. The optical film assembly is located on the light emitting side 201 of the light guide plate 200, and the optical film assembly includes a plurality of optical films stacked on the light emitting side 201 of the light guide plate 200. At least one optical film close to the light guide plate 200 is provided with a first lug 401 matched with the hanging part, so as to limit the optical film.

[0041] Optionally, as shown in Figure 1 The backlight module further includes a reflecting sheet 600, which is located in the receiving cavity and is clamped between the light guide plate 200 and the bottom plate of the back plate 100. The reflecting sheet 600 is located below the light guide plate 200, and the reflecting sheet 600 can reflect the light below the light guide plate 200, thereby increasing the utilization rate of light.

[0042] The light emitting side 201 of the light guide plate 200 is the side from which the light exits the light guide plate 200. In this embodiment, the lamp strip 300 is opposite to the side wall of the light guide plate 200, the light enters from the side of the light guide plate 200, and exits from the top surface of the light guide plate 200. The light emitting side 201 of the light guide plate 200 is the top surface of the light guide plate 200. The optical film assembly is located on the light emitting side 201 of the light guide plate 200, and is used to diffuse and uniformly process the surface light source emitted by the light guide plate 200, thereby ensuring that the display module displays more clearly.

[0043] The optical film assembly generally includes at least two optical films. The optical film close to the light guide plate 200 is referred to as the first optical film 400, and the optical film away from the light guide plate 200 is referred to as the second optical film. Specifically, the first optical film 400 is, for example, a diffusion film, and the second optical film is, for example, a composite film. At least one optical film close to the light guide plate 200 is provided with a first lug 401 matched with the hanging part, that is, only the first optical film 400 can be provided with the first lug 401 matched with the hanging part, or both the first optical film 400 and the second optical film can be provided with the first lug 401 matched with the hanging part. That is, only the first optical film 400 can be positioned by the circuit board 301, or both the first optical film 400 and the second optical film can be positioned by the circuit board 301. Because in practice, due to the height limitation of the light bar 300, only the first optical film 400 cannot be positioned by the back plate 100, the first optical film 400 is positioned by the circuit board 301, and other optical films can still be positioned by the back plate 100, of course, the entire optical film assembly can also be positioned by the circuit board 301.

[0044] In some embodiments, the optical film assembly can also include three layers of optical films, that is, a prism film is further arranged between the first optical film 400 and the second optical film. In this embodiment, only the first optical film 400 can be positioned by the circuit board 301, or both the first optical film 400 and the prism film can be positioned by the circuit board 301, or the entire optical film assembly can be positioned by the circuit board 301.

[0045] For the three-layer optical film assembly, the diffusion film is used to homogenize the surface light source emitted by the light guide plate 200, the prism film is used to concentrate the dispersed light within a certain angle range, and the composite film can protect the backlight module. The above is only an example, and in other embodiments, the optical film can also include other optical films, which are not limited here.

[0046] It should be noted that the drawings only take one optical film, that is, the first optical film 400, as an example to position by the circuit board 301. Other optical films (not shown in the figure) of the optical film assembly are still positioned by the back plate 100, as shown in Figure 3 The first side 101 and the second side 102 of the back plate 100 are provided with a plurality of openings 105, and the other optical films of the optical film assembly are provided with a third lug (not shown in the figure) at the position corresponding to the opening 105, which are matched with each other to position.

[0047] As shown in Figure 3As shown, the back plate 100 has a notch 107 at the four top corner positions, which can reduce the molding difficulty of the back plate 100 and reserve design space for the first hanging ear 401 of the corner part.

[0048] At least one hanging part is arranged on the circuit substrate 301, and the optical film is provided with the corresponding first hanging ear 401. The optical film is limited by the cooperation of the hanging part and the first hanging ear 401. The optical film is positioned by the circuit substrate 301, without increasing the frame width of the circuit substrate 301 and the back plate 100 to shield special structures, and the frame can be easily kept at a small level. At the same time, since the hanging part is arranged on the circuit substrate 301, the back plate 100 does not need to be specially designed, so that the molding process of the back plate 100 does not have any additional difficulty, which is beneficial to reduce the manufacturing difficulty of the back plate 100 and reduce the manufacturing cost of the back plate 100.

[0049] In the positioning mode of the embodiment, the first hanging ear 401 is only responsible for the limiting action in one direction, and there is no problem of mutual influence of precision when positioning in two directions at the same time, and has high positioning precision. At the same time, the first hanging ear 401 is only responsible for one direction positioning, and the stress condition in transportation or vibration test is relatively simple, and is not easy to be damaged. Even if it is damaged, it does not affect the positioning in the other direction, and the picture bad risk is reduced to the minimum.

[0050] In some embodiments of the present application, as shown in Figure 3 The back plate 100 includes a top side 103 and a bottom side 104 opposite along a first direction X, a first side 101 and a second side 102 opposite along a second direction Y, and the first direction X and the second direction Y are parallel to the light emitting surface and perpendicular to each other. The lamp strip 300 has two, which are arranged on the inner side of the first side 101 and the second side 102 respectively.

[0051] As shown in Figure 3 The lamp strip 300 is arranged on the left and right sides of the optical film respectively, and the hanging part cooperates with the first hanging ear 401 to limit the optical film in the first direction X, that is, the up and down direction in the figure, which can solve the problem that the optical film cannot be limited up and down on the left and right sides of the back plate 100 due to the limitation of the lamp strip 300, and does not need to use special limiting structures on the top side 103 and the bottom side 104 of the back plate 100 to limit in the up and down direction and the left and right direction. In this way, the first hanging ear 401 is only responsible for the limiting action in one direction, and there is no problem of mutual influence of precision when positioning in two directions at the same time, and has high positioning precision. At the same time, the first hanging ear 401 is only responsible for one direction positioning, and the stress condition in transportation or vibration test is relatively simple, and is not easy to be damaged. Even if it is damaged, it does not affect the positioning in the other direction, and the picture bad risk is reduced to the minimum.

[0052] In the embodiment, the circuit board 301 limits the optical film from moving up and down, and limits the optical film from moving on both sides, which can meet the requirement of limiting the movement of the optical film up and down under the influence of gravity. In addition, the limitation of the optical film in the up-down direction can be realized by the circuit board 301 on both sides, so that the top side 103 or the ground side 104 of the back plate 100 only needs to limit the optical film in the left-right direction, and does not need to limit the optical film in two directions on the top side 103 or the ground side 104 of the back plate 100. The two directions are limited respectively, and there is no interference problem, which can improve the limiting accuracy.

[0053] Of course, the lamp strip 300 can also be only one, which is arranged on the inner side of the ground side 104. At this time, the limitation of the optical film in the left-right direction can also be realized by the circuit board 301. In addition, since the optical film is also limited on the side where the lamp strip 300 is arranged, when the display screen is used in a "vertical" state after 90° rotation, since the top side 103 and the ground side 104 of the display screen limit the optical film, the optical film can overcome the gravity and ensure normal display of the picture, especially the edge picture. In addition, limiting the optical film by the circuit board 301 is also beneficial to reducing the size of the bottom frame, and can further simplify the structure of the back plate 100 and reduce the manufacturing cost of the back plate 100.

[0054] In some embodiments of the present application, the hanging part is arranged at one or both ends of the circuit board 301 along the first direction X, as shown in Figure 5 、 Figure 6 、 Figure 7 The hanging part is arranged at one end of the circuit board 301 along the first direction X, and the hanging part is a first protrusion 3011 protruding upward from the side of the circuit board 301 parallel to and close to the light-emitting surface. The first hanging ear 401 is arranged at a corner of the optical film, and one side of the first hanging ear 401 abuts against the first protrusion 3011, and the other side abuts against the inner side of the back plate 100.

[0055] In the embodiment, the hanging part can be arranged only at one end of the circuit board 301 along the first direction X, or can be arranged at both ends. The side of the circuit board 301 parallel to and close to the light-emitting surface is the top surface of the circuit board 301, and the first protrusion 3011 is arranged on the top surface. The first hanging ear 401 is arranged at a corner of the optical film, and one side of the first hanging ear 401 abuts against the inner side of the back plate 100, and the other side abuts against the first protrusion 3011, thereby limiting the up-down movement of the optical film.

[0056] It should be noted that when the structure of the light bar 300 changes, the structure of the optical film (only the first optical film 400 is shown in the drawings) will also change accordingly. The first lug 401 will be provided at the corresponding position. The structure of the optical film is not listed one by one in the drawings.

[0057] In some embodiments of the present application, the hanging part is also provided on the middle part of the circuit board 301 away from the end part. The hanging part is a second protrusion 3012 protruding upward from the side of the circuit board 301 parallel to and close to the light emitting surface. Each circuit board 301 is provided with one second protrusion 3012 or at least one pair of second protrusions 3012. Each pair of second protrusions 3012 has a first gap 30121 therebetween. The second protrusion 3012 is provided with one second protrusion 3012 on each of the two circuit boards 301, which abuts the side of the corresponding first lug 401 facing the sky side 103 or the ground side 104, or the second protrusion 3012 is provided with a pair of second protrusions, and the corresponding first lug 401 extends into the first gap 30121.

[0058] In the present embodiment, as shown in Figure 8 When the second protrusion 3012 is provided with only one, the first protrusion 3011 can be provided on the end part of the circuit board 301. The side of the first lug 401 facing the sky side 103 or the ground side 104 abuts the second protrusion 3012. In this way, on the basis of the first protrusion 3011 and the back plate 100 limiting the up and down movement of the optical film, the second protrusion 3012 can further increase the limiting effect of the optical film.

[0059] Alternatively, as shown in Figure 9 Each circuit board 301 can be provided with at least one pair of second protrusions 3012, and each pair consists of two second protrusions 3012. Alternatively, the two adjacent pairs can share a second protrusion 3012 in the middle, that is, each pair consists of three second protrusions 3012, which is suitable for two pairs arranged in close proximity. Of course, the two pairs can also include four second protrusions 3012, which are paired two by two. The first lug 401 extends into the first gap 30121 between the second protrusions 3012. The width of the first lug 401 matches the first gap 30121, and the optical film can be limited by a pair of second protrusions 3012. That is, when a pair or more than a pair of second protrusions 3012 are provided in the middle of the circuit board 301, the first protrusion 3011 can also not be provided, and the second protrusion 3012 can also be used alone to limit the optical film.

[0060] When the first protrusion 3011 and the second protrusion 3012 are provided on the circuit board 301 at the same time, the optical film can be multi-limited, and the limiting effect of the optical film is better.

[0061] In some embodiments of the present application, the distance between the first protrusion 3011 and the second protrusion 3012 and the top surface of the back plate 100 is greater than or equal to 2 mm and less than or equal to 4 mm, for example, it can be 2 mm, 2.5 mm, 3 mm, 4 mm, etc. The first protrusion 3011 and the second protrusion 3012 are slightly lower than the top surface of the back plate 100, and the top surface here refers to the highest surface of the back plate 100 parallel to the light emitting surface. The first protrusion 3011 and the second protrusion 3012 are slightly lower than the top surface of the back plate 100, and are not easy to interfere with other components in the subsequent assembly process.

[0062] In some embodiments of the present application, as shown in Figure 10 The lamp strip 300 has two, respectively arranged on the inner side surface of the first side 101 and the second side 102, and the hanging part is arranged on the middle part of the circuit board 301 away from the end part. The hanging part is a third protrusion 3013 protruding upward from the side of the circuit board 301 parallel to and close to the light emitting surface. Each circuit board 301 is provided with one third protrusion 3013 or at least one pair of third protrusions 3013, and each pair of third protrusions 3013 has a second interval; the third protrusion 3013 is provided with one, and the third protrusion 3013 on one of the circuit boards 301 is in abutment with the corresponding first ear 401 towards the sky side 103, and the third protrusion 3013 on the other circuit board 301 is in abutment with the corresponding first ear 401 towards the ground side 104, or the third protrusion 3013 is provided with a pair, and the corresponding first ear 401 extends into the second interval.

[0063] In the present embodiment, each circuit board 301 is not provided with a first protrusion 3011, and each circuit board 301 is provided with one third protrusion 3013. By means of staggered arrangement of the first ear 401 or staggered arrangement of the third protrusions 3013 on the two circuit boards 301, one of the first ears 401 is in abutment with the corresponding third protrusion 3013 towards the sky side 103, and the other ear is in abutment with the corresponding third protrusion 3013 towards the ground side 104, thereby achieving the limiting effect of the optical film along the up-down direction. The third protrusions 3013 on the left and right sides cooperate with each other to limit the optical film, which can reduce the number of third protrusions 3013 and further simplify the structure of the lamp strip 300.

[0064] Alternatively, each circuit board 301 is provided with at least one pair of third protrusions 3013, and the first ear 401 extends into the second interval between the pair of third protrusions 3013. The present embodiment can refer to Figure 9The first protrusion 3011 at the end of the light bar 300 is removed. The concept of the pair here is the same as that of the pair in the second protrusion 3012, which will not be described here. In this embodiment, the third protrusion 3013 can be used to limit the optical film. The first hanging ear 401 and the third protrusion 3013 do not need to be arranged in a staggered manner, and the optical film can be limited from both sides.

[0065] In some embodiments of the present application, as shown in Figure 11 , Figure 12 and Figure 13 , the hanging part is a buckle 3014 arranged on the side of the circuit board 301 parallel to and close to the light emitting surface. The first hanging ear 401 is inserted into the buckle 3014.

[0066] In some embodiments of the present application, the hanging part is a buckle 3014, and the first hanging ear 401 is inserted into the buckle 3014 to limit the up and down movement of the optical film. When the hanging part is a buckle 3014, only one buckle 3014 is needed to limit the optical film. When the light bar 300 is arranged on the inner side of the first side 101 and the second side 102 of the back plate 100, in order to ensure that the optical film is uniformly stressed, the buckles 3014 can be arranged symmetrically on the circuit boards of the two light bars 300. When the light bar 300 is arranged on the inner side of the ground side 104 of the back plate 100, only one buckle 3014 can be arranged to limit the left and right movement of the optical film. Preferably, the buckle 3014 can be arranged at the middle position of the circuit board 301.

[0067] Optionally, as shown in Figure 11 , Figure 12 and Figure 13 , the buckle 3014 is in the shape of a "mouth", a "U" or an inverted "U".

[0068] The buckle 3014 is in the shape of a "U", which is simpler in structure and easier to manufacture.

[0069] The buckle 3014 is in the shape of a "mouth" or an inverted "U", which can not only limit the up and down movement of the optical film, but also limit the movement of the optical film along the thickness direction of the backlight module, thereby further improving the positioning accuracy.

[0070] It should be noted that the "mouth", "U" or inverted "U" can be a through groove along the first direction X, which can further simplify the structure of the buckle 3014.

[0071] In some embodiments of the present application, in combination with Figure 4 and Figure 14As shown, the optical film piece is provided with at least one second lug 402 on the side corresponding to the top side 103, and the top side 103 of the back plate 100 is provided with a clamping portion 1031, and the second lug 402 cooperates with the clamping portion 1031; and / or, the middle part of the side corresponding to the bottom side 104 of the optical film piece has a recessed structure 403, which is used to avoid the glue frame 500, and the optical film pieces on both sides of the recessed structure 403 are clamped with the glue frame 500.

[0072] In this embodiment, the second lug 402 of the optical film piece cooperates with the clamping portion 1031 of the top side 103 of the back plate 100, wherein the clamping portion 1031 can be a groove arranged towards the optical film piece, and the clamping portion 1031 can also be a "U"-shaped through hole. The cooperation of the second lug 402 and the clamping portion 1031 can limit the left-right movement of the optical film piece. In this way, the up-down movement and the left-right movement of the optical film piece are both limited, which can further improve the positioning accuracy of the optical film piece.

[0073] In combination Figure 4 And Figure 15 As shown, optionally, the optical film piece has a recessed structure 403 in the middle part at one end corresponding to the bottom side 104 of the back plate 100, so that the glue frame 500 can be directly pressed on the light guide plate 200 through the recessed structure 403, which can further limit the light guide plate 200 through the glue frame 500, and ensure the positioning accuracy of the light guide plate 200. The two ends of the optical film piece corresponding to the bottom side 104 form a protruding structure 404 relative to the recessed structure 403, and the protruding structure 404 is inserted into the groove (not shown in the figure) of the glue frame 500, so that the optical film piece is clamped and cooperated with the glue frame 500. As Figure 16 As shown, the top surface of the back plate 100 also has a protruding portion 106, and the corresponding position of the glue frame 500 is provided with an avoiding groove, and the protruding portion 106 is inserted into the avoiding groove, so that the back plate 100 is clamped and cooperated with the glue frame 500.

[0074] In some embodiments of the present application, the back plate 100 includes a top side 103 opposite to a bottom side 104 along a first direction X, and a first side 101 and a second side 102 opposite to each other along a second direction Y, the first direction X and the second direction Y are parallel to the light emitting surface and perpendicular to each other; the light bar 300 has one and is arranged on the inner side of the bottom side 104; the hanging portion is arranged at one or both ends of the circuit board 301 along the first direction X, and the hanging portion is a first protrusion 3011 protruding upward from the side of the circuit board 301 parallel to the light emitting surface and close to the light emitting surface; the first lug 401 is arranged at the corner of the optical film piece, and one side of the first lug 401 along the width direction abuts against the first protrusion 3011, and the other side abuts against the inner side of the back plate 100.

[0075] When the light bar 300 is only one and is arranged on the inner side of the ground side 104 of the back plate 100, the hanging part can be a first protrusion 3011 arranged on the top surface of the circuit substrate 301, and the first lug 401 is arranged at the corner of the optical film. The first protrusion 3011 cooperates with the first lug 401 to limit the left and right movement of the optical film. The optical film is positioned by the circuit substrate 301, so the back plate 100 needs to be hollowed out at this position. Therefore, the light leakage problem caused by the hollowing out of the back plate 100 can be avoided, and the light leakage at this position can be prevented without increasing the light shielding tape, which is beneficial to keep the frame of the back plate 100 small. At the same time, since the back plate 100 does not need to be designed in any special way, the forming process of the back plate 100 does not have any additional difficulty, which is beneficial to reduce the manufacturing difficulty of the back plate 100 and reduce the manufacturing cost of the back plate 100.

[0076] For the case that the light bar 300 is arranged on the inner side of the ground side 104, the hanging part can also be arranged in the middle of the circuit substrate 301. For details, please refer to the embodiment that the light bar 300 is arranged on the first side 101 and the second side 102, which will not be repeated here.

[0077] The second aspect of the present application provides a display module, which comprises a liquid crystal display panel and the backlight module described above; the liquid crystal display panel and the backlight module are arranged oppositely, and the backlight module provides a display light source for the liquid crystal display panel to display an image.

[0078] The display module in the embodiment of the present application comprises a backlight module, which positions at least one optical film by the circuit substrate 301. It can be applied not only to the case that the light bar 300 is installed on the left and right sides of the back plate 100, but also to the case that the light bar 300 is installed on the ground side 104 of the back plate 100, which is limited by the height of the light bar 300 and is not convenient to position by the back plate 100.

[0079] It should be noted that, in the present document, the terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0080] The various embodiments in the specification are described in a related manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0081] The above only describes the preferred embodiments of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that, The backboard comprises a receiving cavity, a light guide plate located in the receiving cavity, at least one light bar located in the receiving cavity and opposite to the side wall of the light guide plate, the light emitting direction of the light bar being towards the side wall of the light guide plate, the light bar comprising a circuit board and a light emitting element, each circuit board being provided with at least one hanging part. The optical film assembly is located on the light emitting side of the light guide plate and comprises a plurality of optical films stacked on one side of the light emitting surface of the light guide plate, at least one optical film located close to the light guide plate being provided with a first ear hook matched with the hanging part to limit the optical film. The hanging part is a protrusion protruding upwards from the side of the circuit board parallel to and close to the light emitting surface, and the first ear hook is in abutment with the protrusion; or the hanging part is a fastening member provided on the side of the circuit board parallel to and close to the light emitting surface, and the first ear hook can be inserted into the fastening member. The backboard comprises a sky side and an earth side opposite in a first direction, a first side and a second side opposite in a second direction, the first direction and the second direction being parallel to the light emitting surface and perpendicular to each other. The light bar has two light bars respectively located on the inner side of the first side and the second side. The hanging part is a first protrusion provided on one or both ends of the circuit board along the first direction, and the first ear hook is provided on the corner of the optical film, one side of the first ear hook being in abutment with the first protrusion, and the other side being in abutment with the inner side of the backboard.

2. The backlight module of claim 1, wherein, The hanging part is a second protrusion provided on the middle part of the circuit board away from the end, each circuit board being provided with one second protrusion or at least one pair of second protrusions, and each pair of second protrusions having a first interval therebetween. The second protrusion is provided with one, and the second protrusions on the two circuit boards are in abutment with the side of the first ear hook corresponding thereto towards the sky side or the earth side, or the second protrusion is provided with a pair, and the first ear hook corresponding thereto extends into the first interval.

3. The backlight module of claim 2, wherein, The distance between the first protrusion and the second protrusion and the top surface of the backboard is greater than or equal to 2mm and less than or equal to 4mm.

4. The backlight module of claim 3, wherein, The hanging part is a third protrusion provided on the middle part of the circuit board away from the end along the first direction, each circuit board being provided with one third protrusion or at least one pair of third protrusions, and each pair of third protrusions having a second interval therebetween. The third protrusion is provided with one, and the side of the third protrusion on one of the circuit boards towards the sky side and the first ear hook corresponding thereto are in abutment, and the side of the third protrusion on the other circuit board towards the earth side and the first ear hook corresponding thereto are in abutment, or the third protrusion is provided with a pair, and the first ear hook corresponding thereto extends into the second interval.

5. The backlight module of claim 4, wherein, The fastening member is in the shape of "mouth", "U" or inverted "U".

6. The backlight module of claim 2, wherein, The side of the optical film corresponding to the sky side is provided with at least one second ear hook, the sky side of the backboard is provided with a clamping part, and the second ear hook is matched with the clamping part; and / or, ​ 7. The backlight module of claim 1, wherein, ​ 8. The backlight module of claim 2, wherein, ​ The optical film has a recess structure in the middle of the side corresponding to the ground side, the recess structure is used to avoid the glue frame, and the optical film on both sides of the recess structure is clamped with the glue frame.

9. The backlight module of claim 1, wherein, The back plate includes a sky side and a ground side opposite in a first direction, a first side and a second side opposite in a second direction, and the first direction and the second direction are parallel to the light emitting surface and perpendicular to each other; The lamp strip has one, and is arranged on the inner side of the ground side; The hanging part is a first protrusion arranged on one or both ends of the circuit substrate along the first direction, the first lug is arranged on the corner of the optical film, one side of the first lug along the width direction abuts against the first protrusion, and the other side abuts against the inner side of the back plate.

10. A display module, characterized by The backlight module comprises the back plate according to any one of claims 1-9; The liquid crystal display panel is arranged opposite to the backlight module, and the backlight module provides a display light source for the liquid crystal display panel to display an image.

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