Backlight module and display device

Abstract

The utility model provides a backlight module and a display device, the backlight module comprises a back plate, an optical film and a rubber frame, the back plate is provided with at least one notch, a lug of the optical film is located in the notch, the rubber frame is provided with an opening at a position corresponding to the notch, the lug penetrates through the notch and extends into the opening, and the opening is matched with the notch to limit the lug; therefore, the rubber frame is provided with the opening, and the convex lug of the optical film extends into the opening, so that the edge landing amount of the convex lug on the optical film is improved, and the risk that the optical film jumps out of the notch of the back plate under various environmental conditions is reduced while accurate positioning of the optical film is realized.

Description

Technical Field

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

[0002] In small-size LCMs (Liquid Crystal Displays), the positioning of optical films is one of the key technologies for achieving optimal display performance. Traditional solutions typically employ a film mounting bracket structure for this purpose. Specifically, a notch is created in a portion of the backplate, and the mounting bracket portion of the optical film overlaps within this notch, ensuring the film edge is flush with the backplate. The contact surfaces on either side of the notch then limit the film's position, thus achieving precise positioning.

[0003] However, traditional solutions still have certain limitations in practical applications. For example, when the backplate thickness is small, the contact end face dimensions on both sides of the notch are correspondingly reduced, resulting in a weakened restraining effect on the diaphragm lugs. In addition, optical diaphragm substrates have the characteristic of shrinking when exposed to low temperatures. Under experimental conditions such as thermal shock, low-temperature drops, or low-temperature storage, the diaphragm lugs may jump out of the backplate notch due to shrinkage, thereby causing display defects.

[0004] Therefore, how to design a solution in small-sized LCMs that can achieve precise positioning of optical films and maintain stability under various environmental conditions has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] This invention provides a backlight module and a display device to reduce the risk of the optical film jumping out of the back plate notch under various environmental conditions while achieving precise positioning of the optical film.

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] This utility model embodiment provides a backlight module, which includes:

[0008] A back plate having a receiving cavity, wherein the back plate has at least one notch;

[0009] An optical film includes a body portion and a plurality of lugs protruding from the body portion, the body portion being located within the receiving cavity, and each lug correspondingly disposed within a notch; and

[0010] The frame has an opening at the position corresponding to the notch;

[0011] The lug extends through the notch into the opening, and the opening is configured to cooperate with the notch to limit the lug.

[0012] In the backlight module provided in this embodiment of the present invention, the opening penetrates the frame, and the lug includes a first sub-part located within the notch and a second sub-part located within the opening. In a first direction, the length of the second sub-part is less than the thickness of the frame. The first direction is the extension direction of the lug from the notch to the opening.

[0013] In the backlight module provided in this embodiment of the present invention, the difference between the thickness of the frame and the length of the second sub-part is greater than or equal to the expansion amount of the optical film.

[0014] In the backlight module provided in this embodiment of the utility model, the back plate includes a bottom and a side portion connected to the bottom, the side portion forming the receiving cavity around the bottom; the frame includes a main body and a support portion connected to each other, the main body is located on the side portion away from the receiving cavity and is fixedly connected to the side portion, and the support portion is located on the side portion away from the bottom;

[0015] The main body portion has the opening, and the support portion covers the lug.

[0016] In the backlight module provided in this embodiment of the present invention, in the first direction, the length of the support portion is greater than the length of the lug.

[0017] In the backlight module provided in this embodiment of the present invention, the lug abuts against the side portion in a second direction perpendicular to the first direction.

[0018] In the backlight module provided in this embodiment of the present invention, in the second direction, the width of the opening is greater than or equal to the width of the notch.

[0019] In the backlight module provided in this embodiment of the present invention, the notch is formed at the end of the side portion away from the bottom.

[0020] In the backlight module provided in this embodiment of the utility model, the backlight module further includes a light-shielding member, which is disposed on the surface of the frame away from the receiving cavity, the light-shielding member covers the opening, and there is a gap between the lug and the light-shielding member.

[0021] This utility model embodiment also provides a display device, which includes:

[0022] The backlight module as described in one of the foregoing embodiments;

[0023] The display panel is disposed on the light-emitting side of the backlight module and is disposed in a corresponding receiving cavity.

[0024] The beneficial effects of this utility model are as follows: In the backlight module and display device provided by this utility model, the backlight module includes a back plate, an optical film, and a frame. The back plate is provided with multiple notches, and the lugs of the optical film are located in the notches. The frame is provided with an opening at the corresponding position of the notch, and the lugs extend through the notch into the opening. The opening cooperates with the notch to limit the lugs. In this way, by providing an opening on the frame and allowing the lugs of the optical film to extend into the opening, the overlap of the lugs on the optical film is increased, thereby achieving precise positioning of the optical film while reducing the risk of the optical film jumping out of the notch on the back plate under various environmental conditions. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A partial cross-sectional structural diagram of a backlight module is shown.

[0027] Figure 2 This is a partial cross-sectional structural diagram of the display device provided in an embodiment of the present utility model.

[0028] Figure 3 for Figure 2 A schematic diagram of a partial planar structure of the optical film. Detailed Implementation

[0029] The following descriptions of the embodiments are with reference to the accompanying drawings, illustrating specific embodiments in which the present invention can be implemented. Directional terms used in this invention, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and understanding of the present invention, and not for limiting the present invention. In the drawings, structurally similar units are denoted by the same reference numerals. In the drawings, the thickness of some layers and regions is exaggerated for clarity and ease of description. That is, the dimensions and thicknesses of each component shown in the drawings are arbitrary, but the present invention is not limited thereto.

[0030] Please refer to Figure 1 , Figure 1This example illustrates a partial cross-sectional structural diagram of a backlight module. The backlight module includes a backplate 10', an optical film 20', and a frame 30'. The backplate 10' includes a bottom 11' and a side 12', with the side 12' forming a receiving cavity around the bottom 11'. The frame 30' is fixedly connected to the side 12'. The optical film 20' is located within the receiving cavity. The peripheral side of the optical film 20' is provided with lugs 22' (i.e., hook structures) for positioning. A partial notch 120' is formed on the side 12' of the backplate 10', and the lugs 22' of the optical film 20' partially overlap within the notch 120' of the side 12', making the edge of the film flush with the backplate 10'. The contact surfaces on both sides of the notch 120' limit the film's position, thereby achieving precise positioning of the film.

[0031] However, when the thickness of the backplate 10' is small, the contact end face dimensions on both sides of the notch 120' are correspondingly reduced, resulting in a weakened limiting effect on the diaphragm lugs. In addition, the substrate of the optical diaphragm 20' has the characteristic of shrinking when cooled in low-temperature environments. Under experimental environments such as thermal shock, low-temperature drop, or low-temperature storage, the diaphragm lugs may jump out of the notch 120' of the backplate 10' due to shrinkage, thereby causing display defects.

[0032] To address this, the present invention provides a backlight module and a display device that, while achieving precise positioning of the optical film, reduces the risk of the optical film detaching from the backplate notch under various environmental conditions. The display device can be an electronic device with display functions, such as a television, mobile phone, tablet computer, computer monitor, gaming device, wearable device, digital camera, car navigation system, electronic billboard, or ATM.

[0033] Please refer to Figure 2 and Figure 3 , Figure 2 This is a partial cross-sectional structural diagram of the display device provided in an embodiment of the present utility model. Figure 3 for Figure 2 A schematic diagram of a partial planar structure of the optical film. (Refer to...) Figure 2 The display device 1000 includes a backlight module 100 and a display panel 200 located on the light-emitting side of the backlight module 100. The display panel 200 is a liquid crystal display panel, and the backlight module 100 provides backlight for the display panel 200.

[0034] The backlight module 100 includes a back plate 10, an optical film 20, and a frame 30. The back plate 10 includes a bottom 11 and a side portion 12 connected to the bottom 11. The side portion 12 forms a receiving cavity around the bottom 11, and a plurality of notches 120 are formed at the end of the side portion 12 away from the bottom 11. The optical film 20 includes a body portion 21 and at least one lug 22 protruding from the body portion 21. The body portion 21 is located within the receiving cavity, and each lug 22 is correspondingly disposed within one of the notches 120.

[0035] The frame 30 is fixedly connected to the side portion 12. The frame 30 has an opening 310 at a position corresponding to the notch 120. The lug 22 extends through the notch 120 into the opening 310. The opening 310 is configured to cooperate with the notch 120 to limit the lug 22. Thus, by providing the opening 310 on the frame 30 and allowing the lug 22 of the optical film 20 to extend into the opening 310, the overlap of the lug 22 on the optical film 20 is increased. This achieves precise positioning of the optical film 20 while reducing the risk of the optical film 20 jumping out of the notch 120 of the back plate 10 under various environmental conditions.

[0036] The backlight module 100 also includes a light guide plate 40, a light source, etc. The light guide plate 40 and the light source are disposed in the receiving cavity. The frame 30 cooperates with the back plate 10 to fix the light guide plate 40 and the light source and other optical components in the receiving cavity.

[0037] The light source is located on at least one side of the light guide plate 40, wherein the side of the light guide plate 40 is connected between the upper and lower surfaces of the light guide plate 40, the upper surface of the light guide plate 40 is the light emitting surface of the light guide plate 40, the lower surface of the light guide plate 40 is disposed opposite to the upper surface, and the side of the light guide plate 40 opposite to the light source is the light incident surface of the light guide plate 40. The light guide plate 40 is used to convert the side light source into a surface light source.

[0038] Of course, the backlight module 100 may also include a reflective sheet disposed on the lower surface of the light guide plate 40. The reflective sheet is used to reflect light leaking from the lower surface of the light guide plate 40 to improve light utilization.

[0039] The optical film 20 is disposed on the side of the light guide plate 40 away from the bottom 11 of the back plate 10. The optical film 20 and the reflective sheet are respectively located on opposite sides of the light guide plate 40, and the light guide plate 40 is located between the optical film 20 and the reflective sheet.

[0040] Optionally, the optical film 20 includes a diffusion film and a prism sheet located on the side of the diffusion film opposite to the light guide plate 40. The diffusion film is disposed in close contact with the light guide plate 40 to uniformly disperse light and eliminate bright spots and dark areas. The prism sheet may include an upper prism sheet and a lower prism sheet. The upper prism sheet is located on the side of the lower prism sheet opposite to the diffusion film. The lower prism sheet is used to converge light through the prism structure to improve frontal brightness. The upper prism sheet is used to further optimize light distribution and enhance brightness and uniformity.

[0041] In some embodiments, the optical film 20 may further include an enhancement film located on the side of the prism sheet opposite to the diffusion film. The enhancement film can recycle polarized light, improving overall brightness. In other embodiments, the optical film 20 may further include a protective film located on the uppermost layer of the optical film 20 to protect the lower films from scratches and contamination; for example, the protective film may be located on the side of the brightness enhancement film opposite to the prism sheet.

[0042] The optical diaphragm 20 includes a body portion 21 and a plurality of lugs 22 protruding from the body portion 21. The body portion 21 is located within the receiving cavity formed by the back plate 10. The body portion 21 is used to enable the optical diaphragm 20 to adjust light itself, and the lugs 22 are used to position the optical diaphragm 20. The plurality of lugs 22 may be evenly distributed on the edge of the optical diaphragm 20 to improve the stability of the positioning of the optical diaphragm 20.

[0043] For example, in some embodiments, the surface shape of the optical film 20 is rectangular, and the lugs 22 are disposed on the four sides of the rectangle to achieve a uniform distribution of the lugs 22. Optionally, at least one lug 22 is disposed on each side, and the lugs 22 on opposite sides are disposed opposite each other.

[0044] The back plate 10 has a notch 120 at a position corresponding to the lug 22, and a portion of the structure of the lug 22 is located within the notch 120. Each lug 22 corresponds to one notch 120. Specifically, the notch 120 is formed at the end of the side portion 12 of the back plate 10, and extends from the end of the side portion 12 toward the bottom 11 in the thickness direction Z of the backlight module 100. Optionally, the back plate 10 is a metal back plate 10, such as an aluminum back plate 10.

[0045] The frame 30 has an opening 310 at a position corresponding to the notch 120, and the opening 310 corresponds one-to-one with the lug 22. The lug 22 extends through the notch 120 into the opening 310, and the opening 310 is configured to cooperate with the notch 120 to limit the lug 22. Optionally, the frame 30 is made of polycarbonate, acrylic, or other materials.

[0046] In some embodiments, the opening 310 penetrates the frame 30. The lug 22 includes a first sub-part 221 located within the notch 120 and a second sub-part 222 located within the opening 310. In a first direction X, the length of the second sub-part 222 is less than the thickness of the frame 30. The first direction X is the extension direction of the lug 22 from the notch 120 to the opening 310, and the first direction X is perpendicular to the thickness direction Z of the backlight module 100. The thickness direction Z of the backlight module 100 is parallel to the light emission direction of the backlight module 100. In other words, the thickness direction Z of the backlight module 100 is the stacking direction of the reflector, the light guide plate 40, and the optical film 20.

[0047] The first sub-part 221 and the second sub-part 222 are integrally formed. Optionally, the lug 22 may further include a third sub-part located within the receiving cavity. The first sub-part 221 connects the second sub-part 222 and the third sub-part. The length of the first sub-part 221 in the first direction X is equal to the thickness of the side portion 12 of the back plate 10 in the first direction X.

[0048] In some embodiments, the difference between the thickness of the frame 30 and the length of the second sub-part 222 is greater than or equal to the expansion amount of the optical film 20, so as to provide expansion space for the optical film 20.

[0049] In some embodiments, the frame 30 includes a main body 31 and a support 32 connected to each other. The main body 31 is located on the side of the side 12 opposite to the receiving cavity and is fixedly connected to the side 12. The support 32 is located on the side of the side 12 away from the bottom 11. The main body 31 has an opening 310 formed at the connection between the main body 31 and the support 32. The support 32 covers the lug 22; for example, in the first direction X, the length of the support 32 is greater than the length of the lug 22. Specifically, "the support 32 covers the lug 22" means that, from the frontal viewing angle of the backlight module 100, the support 32 covers the lug 22. The support 32 is used to support the display panel 200.

[0050] In some embodiments, refer to Figure 3 In the second direction Y, perpendicular to the first direction X, the lug 22 abuts against the side portion 12 to improve the positioning accuracy of the optical film 20. The abutment between the lug 22 and the side portion 12 is not limited to direct contact; rather, it refers to a smaller gap between the lug 22 and the side portion 12 in the second direction Y, thereby reducing the displacement of the lug 22 in the second direction Y and improving the positioning accuracy of the optical film 20. Furthermore, the second direction Y is parallel to the first direction X in the same plane, and it is also perpendicular to the thickness direction Z of the backlight module 100.

[0051] In some embodiments, the width of the opening 310 in the second direction Y is greater than or equal to the width of the notch 120, thereby reducing the assembly difficulty of the optical film 20. Since the lug 22 abuts against the side portion 12 in the second direction Y, the side portion 12 can limit the displacement of the lug 22 in the second direction Y. Therefore, the frame 30 does not need to limit the lug 22 in the second direction Y. In this way, the size of the opening 310 in the second direction Y can be increased, thereby reducing the assembly difficulty of the optical film 20.

[0052] In some embodiments, continue to refer to Figure 2 The backlight module 100 further includes a light-shielding member 50, which is disposed on the surface of the frame 30 opposite to the receiving cavity. A gap exists between the lug 22 and the light-shielding member 50. The light-shielding member 50 covers the opening 310 to block light leakage from the opening 310. The light-shielding member 50 is a black polyethylene terephthalate (PET) film or other flexible film with light-shielding properties.

[0053] In some embodiments, continue to refer to Figure 2 The display panel 200 is disposed on the light-emitting side of the backlight module 100 and located above the receiving cavity, and is fixedly connected to the frame 30 of the backlight module 100. For example, the display panel 200 can be fixedly connected to the support portion 32 of the frame 30 through an adhesive layer. The display panel 200 is a liquid crystal display panel 200, which includes a liquid crystal cell and a first polarizer 203 located on the bottom 11 side of the liquid crystal cell away from the back plate 10, that is, the first polarizer 203 is located on the light-emitting side of the liquid crystal cell.

[0054] The liquid crystal cell includes an array substrate 201 and a color filter substrate 202 disposed opposite to each other. The color filter substrate 202 is located on the side of the array substrate 201 away from the backlight module 100. Naturally, the display panel 200 also includes a liquid crystal layer disposed between the array substrate 201 and the color filter substrate 202, a sealing adhesive, and a second polarizer disposed on the side of the array substrate 201 away from the color filter substrate 202. The sealing adhesive surrounds the liquid crystal layer to seal it.

[0055] Exemplarily, the display device 1000 includes a display area AA and a frame area BA located outside the display area AA. The frame 30 and the lugs 22 of the optical film 20 are both disposed in the frame area BA. The array substrate 201 has a plurality of sub-pixels arranged in an array corresponding to the display area AA. Exemplarily, each sub-pixel includes a pixel driving circuit and a first electrode. The pixel driving circuit is electrically connected to the first electrode to provide a driving signal to the first electrode.

[0056] The color filter substrate 202 includes a second electrode and a color filter layer. An electric field is formed between the second electrode and the first electrode to drive the liquid crystal molecules of the liquid crystal layer to deflect, thereby controlling the transmittance of the backlight of the backlight module 100. However, the structure of the display panel 200 is not limited to this. For example, the second electrode and the color filter layer may also be disposed on the array substrate 201.

[0057] The color filter layer includes multiple color filter blocks of different colors and a black matrix located between adjacent color filter blocks. The different color filter blocks include red color filter blocks, green color filter blocks, and blue color filter blocks, and each color filter block corresponds to one sub-pixel. It should be noted that the description of the specific structure of the array substrate 201 and the color filter substrate 202 in this embodiment is only an example, and the present invention is not limited thereto. For example, the array substrate 201 of the present invention may also be provided with the second electrode, so that the second electrode does not need to be provided on the color filter substrate 202.

[0058] As can be seen from the above embodiments:

[0059] The present invention provides a backlight module and a display device. The backlight module includes a back plate, an optical film, and a frame. The back plate has multiple notches, and the lugs of the optical film are located in the notches. The frame has an opening at the corresponding position of the notch, and the lugs extend through the notch into the opening. The opening cooperates with the notch to limit the lugs. In this way, by setting an opening on the frame and allowing the lugs of the optical film to extend into the opening, the overlap of the lugs on the optical film is increased. This achieves precise positioning of the optical film while reducing the risk of the optical film jumping out of the notch on the back plate under various environmental conditions.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a back plate, which is provided with at least one notch and forms a receiving cavity; an optical film, which comprises a body portion and a plurality of lugs protruding from the body portion, the body portion being located in the receiving cavity, and each of the lugs being arranged in one of the notches; a frame, which is provided with an opening corresponding to the notch; wherein the lugs extend through the notches into the openings, and the openings are arranged to limit the lugs in cooperation with the notches. The opening penetrates the frame, the lug comprises a first sub-portion located in the notch and a second sub-portion located in the opening, and in a first direction, the length of the second sub-portion is less than the thickness of the frame, the first direction being the extension direction of the lug from the notch to the opening.

2. The backlight module of claim 1, wherein, The difference between the thickness of the frame and the length of the second sub-portion is greater than or equal to the expansion amount of the optical film.

3. The backlight module of claim 2, wherein, The back plate comprises a bottom portion and a side portion connected to the bottom portion, and the side portion forms the receiving cavity around the bottom portion; 4. The backlight module of claim 2, wherein, The frame comprises a main portion and a support portion connected to each other, the main portion is located on the side of the side portion away from the receiving cavity and is fixedly connected to the side portion, and the support portion is located on the side of the side portion away from the bottom portion; wherein the main portion forms the opening, and the support portion covers the lug. In the first direction, the length of the support portion is greater than the length of the lug.

5. The backlight module of claim 4, wherein, In a second direction perpendicular to the first direction, the lug abuts against the side portion.

6. The backlight module of claim 5, wherein, In the second direction, the width of the opening is greater than or equal to the width of the notch.

7. The backlight module of claim 6, wherein, The notch is formed at the end of the side portion away from the bottom portion.

8. The backlight module of claim 7, wherein, The backlight module further comprises a light shielding member arranged on the surface of the frame away from the receiving cavity, the light shielding member covers the opening, and there is a gap between the lug and the light shielding member.

9. The backlight module according to any one of claims 1-8, wherein, The backlight module comprises:

10. A display device, characterized by comprising: the backlight module according to any one of claims 1 to 9; a display panel arranged on the light emitting side of the backlight module and corresponding to the receiving cavity. ​

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