Backlight module and display terminal

Abstract

The utility model relates to a backlight module and a display terminal. The backlight module comprises a back plate and an optical film, the back plate comprises a bottom plate and side plates located on the edges of the bottom plate, and the bottom plate and the side plates form a containing cavity; the optical film is arranged in the containing cavity, and the edge of the optical film extends in the direction away from the center of the optical film to form a plurality of convex lugs; wherein the side plate is provided with a plurality of limiting grooves used for containing the convex lugs, one convex lug corresponds to one limiting groove, and the depth of the edge area of each limiting groove is larger than that of the middle area of each limiting groove. The depth of the edge area of the limiting groove is set to be larger than the depth of the middle area of the limiting groove, when the optical film is impacted by mechanical vibration and the like, the convex lug is not prone to interfering with the edge area of the limiting groove in the depth direction of the limiting groove, and therefore damage is not prone to occurring; therefore, the risk of poor white points when the backlight module is lightened can be improved.

Description

TECHNICAL FIELD

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

[0002] Liquid crystal display devices are widely used in various display products, such as computers, televisions, etc. The liquid crystal display device includes a backlight module and a display panel. The display panel is used to display pictures, and the backlight module is used to provide a planar light source for the display panel.

[0003] In the backlight module, multiple optical films are usually used to improve brightness and uniformity, etc. In order to fix the optical films, in the related art, a side wall opening is formed in a back plate, and a lug is arranged at the edge of the optical film, and the lug is embedded in the side wall opening. However, in the process of testing, transportation, etc. of the liquid crystal display device, the optical film is subjected to mechanical vibration and other impacts, and damage is prone to occur near the lug, and white spot defects are presented when the backlight module is lit. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a backlight module and a display terminal to improve the technical problem that damage occurs near the lug of the backlight module and white spot defects are presented when lit.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a backlight module is provided, comprising:

[0006] A back plate comprising a bottom plate and a side plate located at the edge of the bottom plate, the bottom plate and the side plate forming a containing cavity;

[0007] An optical film arranged in the containing cavity, the edge of the optical film extending in a direction away from the center of the optical film to form multiple lugs;

[0008] Wherein, the side plate is provided with multiple limiting grooves for containing the lugs, one lug corresponds to one limiting groove, and the depth of the edge region of the limiting groove is greater than the depth of the middle region of the limiting groove.

[0009] Optionally, the limiting groove comprises a side wall, a bottom wall and a transition wall connecting the side wall and the bottom wall, the transition wall is located at the edge region of the limiting groove, and the bottom wall is located at the middle region of the limiting groove.

[0010] Wherein, the transition wall is recessed towards the side close to the bottom plate relative to the bottom wall.

[0011] Optionally, the surface of the bottom wall comprises a plane, and the surface of the transition wall comprises a plane and / or a curved surface.

[0012] Optionally, the surface of the transition wall adjacent to the side wall is a circular arc surface.

[0013] Optionally, the distance between the surface of the bottom wall and the surface of the transition wall is greater than 0 mm and less than or equal to 0.5 mm.

[0014] Optionally, the lug comprises a bent portion corresponding to the edge region of the limiting groove, and the bent portion is bent towards the side close to the bottom plate or the side away from the bottom plate.

[0015] Optionally, the length of the bent portion in the length direction of the side plate is less than or equal to the length of the transition wall in the length direction of the side plate.

[0016] Optionally, the maximum height of the lug in the depth direction of the limiting groove is less than or equal to the maximum depth of the limiting groove.

[0017] Optionally, the edges of the opposite sides of the optical film are provided with the lug; or the edges of three sides of the optical film are provided with the lug.

[0018] Optionally, the edges of the same side of the optical film are provided with at least two lugs.

[0019] According to a second aspect of the present application, a display terminal is provided, which comprises a display panel and the backlight module described above, and the display panel is arranged on the side of the optical film away from the bottom plate.

[0020] In the backlight module of the embodiments of the present application, the depth of the edge region of the limiting groove is set to be greater than the depth of the middle region of the limiting groove, so that when the optical film is subjected to mechanical vibration or other impact, the lug is not easy to interfere with the edge region of the limiting groove in the depth direction of the limiting groove, and thus damage is not easy to occur, thereby improving the risk of white point failure when the backlight module is lit.

[0021] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0023] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0024] Figure 1is a perspective structural schematic view of a backlight module provided in the exemplary embodiments of the present application;

[0025] Figure 2 is Figure 1 is a sectional view at A-A in FIG. 1;

[0026] Figure 3 is Figure 1 is an enlarged structural schematic view at C in FIG. 1;

[0027] Figure 4 is Figure 3 is a structural schematic view of one of the exemplary embodiments of the present application viewed in a direction perpendicular to the side plate;

[0028] Figure 5 is Figure 3 is a structural schematic view of another one of the exemplary embodiments of the present application viewed in a direction perpendicular to the side plate;

[0029] Figure 6 is Figure 3 is a structural schematic view of another one of the exemplary embodiments of the present application viewed in a direction perpendicular to the side plate;

[0030] Figure 7 is Figure 5 is a partial perspective structural schematic view of the optical film in FIG. 1;

[0031] Figure 8 is a structural schematic view of a display terminal provided in the exemplary embodiments of the present application.

[0032] BRIEF DESCRIPTION OF THE DRAWINGS

[0033] backlight module 1;

[0034] back plate 10, bottom plate 11, side plate 12, limiting groove 121, side wall 121a, bottom wall 121b, transition wall 121c;

[0035] optical film 20, lug 21, bending portion 211;

[0036] light guide plate 31, reflecting sheet 32;

[0037] depth h1 of the edge region of the limiting groove 121, depth h2 of the middle region of the limiting groove 121, spacing h3 between the surface of the bottom wall 121b and the surface of the transition wall 121c, maximum height h4 of the lug 21 in the depth direction of the limiting groove 121;

[0038] length s1 of the bending portion 211 in the length direction D1 of the side plate 12, length s2 of the transition wall 121c in the length direction D1 of the side plate 12;

[0039] length direction D1 of the side plate 12, height direction D2 of the side plate 12, thickness direction D3 of the side plate 12;

[0040] The display terminal 2 and the display panel 3. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the 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 a person skilled in the art without creative effort shall fall within the protection scope of the present application.

[0042] As Figures 1 to 4 shown, according to a first aspect of the present application, a backlight module 1 is provided, the backlight module 1 comprising a back plate 10 and an optical film 20, the back plate 10 comprising a bottom plate 11 and a side plate 12 located at the edge of the bottom plate 11, the bottom plate 11 and the side plate 12 forming a containing cavity; the optical film 20 is arranged in the containing cavity, and the edge of the optical film 20 extends in a direction away from the center of the optical film 20 to form a plurality of lugs 21; wherein the side plate 12 is provided with a plurality of limiting grooves 121 for containing the lugs 21, one lug 21 corresponds to one limiting groove 121, and the depth h1 of the edge region of the limiting groove 121 is greater than the depth h2 of the middle region of the limiting groove 121.

[0043] The backlight module 1 is used to provide a planar light source for a liquid crystal panel, and the light-emitting color of the backlight module 1 can be white light. The liquid crystal panel is arranged on the side of the backlight module 1 in the light-emitting direction.

[0044] As Figures 1 to 4 shown, the back plate 10 comprises a bottom plate 11 and a side plate 12 located at the edge of the bottom plate 11, and the bottom plate 11 and the side plate 12 are connected and form a containing cavity. The bottom plate 11 and the back plate 10 are both plate-shaped structures. For the convenience of description, the side surface of the bottom plate 11 close to the side plate 12 is referred to as the upper surface of the bottom plate 11, and the light-emitting direction of the backlight module 1 is perpendicular to the upper surface of the bottom plate 11.

[0045] The material of the back plate 10 can be a metal material, for example, electro-galvanized steel sheet (SECC), hot-dipped galvanized steel sheet (SGCC), aluminum-zinc plated steel sheet (SGLC), aluminum, etc. The back plate 10 can be a sheet metal part, and the bottom plate 11 and the side plate 12 can be integrally formed.

[0046] As Figure 3 shown, the backlight module 1 comprises an optical film 20, and the optical film 20 is used to make the light-emitting of the backlight module 1 brighter and more uniform.

[0047] The optical film 20 can be at least one or more of a diffuser, a prism sheet, etc. For example, the optical film 20 can be multiple stacked films, with adjacent films separated and assembled in the receiving cavity of the back plate 10. For example, the optical film 20 can include three films stacked sequentially from bottom to top: a lower diffuser, a lower prism sheet, and an upper prism sheet. Figure 3 The diagram shows an optical diaphragm 20 comprising three diaphragms.

[0048] Optionally, the optical film 20 is a single composite film, which can integrate multiple functions such as diffusion and brightening.

[0049] like Figure 3 As shown, the optical film 20 is a sheet material. This means that the area of ​​the upper and lower surfaces of the optical film 20 is greater than the area of ​​any other surface of the optical film 20. The upper surface of the optical film 20 is the light-emitting surface of the backlight module 1, and the upper surface of the optical film 20 is the side of the optical film 20 that faces away from the base plate 11.

[0050] The backlight module 1 also includes a light guide plate 31, which is disposed within the receiving cavity. An optical film 20 is disposed on the side of the light guide plate 31 facing away from the base plate 11. The backlight module 1 also includes LEDs (not shown in the figure), which can be light-emitting diodes (LEDs) or the like. The light guide plate 31 distributes the light from the LEDs across the entire light-emitting surface of the backlight module 1, and the optical film 20 further enhances the brightness and uniformity of the light on the plane of the light guide plate 31.

[0051] like Figure 2 As shown, a reflector 32 is also provided on the side of the light guide plate 31 near the base plate 11. The reflector 32 is used to reflect the light from the light guide plate 31 and improve the utilization rate of the light.

[0052] like Figure 2 and Figure 3 As shown, the optical film 20 has a lug 21 on its edge, which extends away from the center of the optical film 20. A limiting groove 121 is provided on the side plate 12 corresponding to the position of the lug 21, and the limiting groove 121 penetrates the side plate 12 in the thickness direction D3. After the optical film 20 is placed in the receiving cavity of the back plate 10, the lug 21 extends away from the center of the optical film 20 to the limiting groove 121, and the lug 21 is received within the limiting groove 121.

[0053] It should be understood that, such as Figure 2 As shown, the surface of the lug 21 furthest from the center of the optical film 20 does not extend beyond the surface of the side plate 12 furthest from the center of the backlight, and the thickness of the lug 21 is less than the depth h2 of the middle region of the limiting groove 121. Figure 3 As shown, the length of the lug 21 is less than the length of the limiting groove 121.

[0054] The depth h1 of the edge region of the limiting groove 121 is greater than the depth h2 of the middle region of the limiting groove 121. The middle region and the edge region of the limiting groove 121 are arranged along the arrangement direction of the two side walls 121a of the limiting groove 121, that is, the middle region and the edge region are arranged along the length direction D1 of the side plate 12. The limiting groove 121 is divided into one middle region and two edge regions in the length direction D1 of the side plate 12. The middle region and the edge regions are adjacent to each other, and the edge regions are close to the side wall 121a of the limiting groove 121.

[0055] like Figure 3 As shown, the length direction of side plate 12 is D1, and the height direction of side plate 12 is D2. The length direction D1 of side plate 12 is perpendicular to the height direction D2 of side plate 12. The depth of the limiting groove 121 refers to the dimension of the limiting groove 121 in the height direction D2 of side plate 12. The thickness direction D3 of side plate 12 is perpendicular to both the length direction D1 and the height direction D2 of side plate 12.

[0056] When the backlight module 1 is subjected to mechanical vibration or other impacts, the optical diaphragm 20 will wobble within the receiving cavity of the backplate 10, and the lug 21 will easily rub against the surface of the limiting groove 121. Since the optical diaphragm 20 is made of plastic and is relatively thin, while the backplate 10 is made of a hard material such as metal, the lug 21 will be damaged after rubbing against the surface of the limiting groove 121. The function of the damaged optical diaphragm 20 will be affected, and it will manifest as white spot defects after the backlight module 1 is lit.

[0057] The inventors of this application discovered that the lug 21 is mainly damaged by friction with the bottom surface of the limiting groove 121, and the damaged area of ​​the lug 21 is located at its edge. Therefore, by setting the depth h1 of the edge region of the limiting groove 121 to be greater than the depth h2 of the middle region of the limiting groove 121, the risk of friction between the lower surface of the lug 21 and the bottom surface of the limiting groove 121 can be reduced, thereby reducing the risk of damage to the lug 21.

[0058] Optionally, such as Figure 4 As shown, the limiting groove 121 includes a side wall 121a, a bottom wall 121b, and a transition wall 121c connecting the side wall 121a and the bottom wall 121b. The transition wall 121c is located in the edge region of the limiting groove 121, and the bottom wall 121b is located in the middle region of the limiting groove 121. The transition wall 121c is recessed relative to the bottom wall 121b towards the side closer to the bottom plate 11.

[0059] Specifically, the limiting groove 121 comprises two opposite side walls 121a, a transition wall 121c connected with the side walls 121a, and a bottom wall 121b connected with the two transition walls 121c. The transition wall 121c is recessed towards the side of the bottom plate 11 relative to the bottom wall 121b, so that the depth h1 of the edge region of the limiting groove 121 is greater than the depth h2 of the middle region of the limiting groove 121.

[0060] It should be noted that the depth h1 of the edge region of the limiting groove 121 should be less than the height of the side plate 12.

[0061] As shown in FIG. 1, the side wall 121a of the limiting groove 121 is opposite to the side surface of the lug 21, and the bottom wall 121b of the limiting groove 121 is opposite to the lower surface of the lug 21. The side wall 121a of the limiting groove 121 is used to limit the lug 21 in the length direction D1 of the side plate 12, and the bottom wall 121b of the limiting groove 121 is used to limit the lug 21 in the height direction D2 of the side plate 12. Figure 4 As shown in FIG. 1, the surface of the bottom wall 121b comprises a flat surface, so as to better bear the lower surface of the lug 21.

[0062] Figure 4 In some embodiments, the surface of the transition wall 121c can be a flat surface.

[0063] In some embodiments, the surface of the transition wall 121c can be a curved surface, such as a semicircular surface or a semi-elliptical surface.

[0064] In some embodiments, the surface of the transition wall 121c can be a combination of a flat surface and a curved surface. The curved surface can be arranged at the connection between the transition wall 121c and the bottom wall 121b of the limiting groove 121, or the curved surface can be arranged at the connection between the transition wall 121c and the side wall 121a of the limiting groove 121, but not limited thereto.

[0065] Optionally, the surface of the transition wall 121c adjacent to the side wall 121a is a circular arc surface, so as to reduce the stress concentration between the transition wall 121c and the side wall 121a, and also to reduce the risk of interference with the lug 21.

[0066] Optionally, as shown in FIG. 1, the distance h3 between the surface of the bottom wall 121b and the surface of the transition wall 121c is greater than 0 millimeter and less than or equal to 0.5 millimeter. That is, the depth of the transition wall 121c recessed towards the side of the bottom plate 11 relative to the surface of the bottom wall 121b is greater than 0 millimeter and less than 0.5 millimeter. When h3 is too small, it cannot avoid the lug 21; when h3 is too large, light will leak at the transition wall 121c when the backlight module 1 is lit.

[0067] Optionally, as shown in FIG. 1, the distance h3 between the surface of the bottom wall 121b and the surface of the transition wall 121c is greater than 0 millimeter and less than or equal to 0.5 millimeter. That is, the depth of the transition wall 121c recessed towards the side of the bottom plate 11 relative to the surface of the bottom wall 121b is greater than 0 millimeter and less than 0.5 millimeter. When h3 is too small, it cannot avoid the lug 21; when h3 is too large, light will leak at the transition wall 121c when the backlight module 1 is lit. Figure 4

[0068] ​​Optionally, the lug 21 includes a bent portion 211 corresponding to the edge region of the limiting groove 121. As shown in Figure 5 , the bent portion 211 is bent towards the side close to the bottom plate 11. As shown in Figure 6 , the bent portion 211 is bent towards the side away from the bottom plate 11.

[0069] Please refer to Figure 7 , Figure 7 , which shows the perspective structure of the lug 21. The bent portion 211 is arranged at the corner of the lug 21, and is bent upwards or downwards relative to other parts of the lug 21. The upper surface of the bent portion 211 can be triangular, but is not limited thereto.

[0070] Optionally, as shown in Figure 5 and Figure 6 , the length s1 of the bent portion 211 in the length direction D1 of the side plate 12 is less than or equal to the length s2 of the transition wall 121c in the length direction D1 of the side plate 12. That is, the bent portion 211 can be accommodated by the edge region of the limiting groove 121, and the bent portion 211 will not interfere with the bottom wall 121b. Through the above arrangement, the bent portion 211 can be prevented from being damaged by friction with the bottom wall 121b.

[0071] It should be understood that, in combination with Figure 2 , Figure 5 and Figure 6 , the length of the bent portion 211 in the thickness direction D3 of the side plate 12 is less than the width of the lug 21. The width of the lug 21 refers to the size of the lug 21 extending beyond the edge of the optical film 20 in the direction away from the center of the optical film 20, i.e. the size of the lug 21 in the thickness direction D3 of the side plate 12.

[0072] Optionally, as shown in Figure 5 and Figure 6 , the maximum height h4 of the lug 21 in the depth direction of the limiting groove 121 is less than or equal to the maximum depth of the limiting groove 121. Since the bent portion 211 is bent relative to the upper surface of the optical film 20, the height of the bent portion 211 will be greater than the thickness of the optical film 20. In order to enable the bent portion 211 to be accommodated by the limiting groove 121, the maximum height of the bent portion 211 should be less than or equal to the maximum depth of the limiting groove 121. Since the depth h1 of the edge region of the limiting groove 121 is greater than the depth h2 of the middle region of the limiting groove 121, the maximum depth of the limiting groove 121 is located at the edge region of the limiting groove 121.

[0073] Optionally, as shown in Figure 1As shown, the edges of the opposite sides of the optical film 20 are provided with the lugs 21; or, the edges of three sides of the optical film 20 are provided with the lugs 21; wherein the edges of the same side of the optical film 20 are provided with at least two lugs 21.

[0074] In order to more stably fix the optical film 20 on the back plate 10, the edges of the opposite sides of the optical film 20 are provided with the lugs 21.

[0075] It should be noted that, since the width of the frame on the lower side of the backlight module 1 is greater than the width of the frame on the left side, the right side and the upper side of the backlight module 1, the lugs 21 of the optical film 20 can be correspondingly provided on the left side and the right side of the backlight module 1. For example, the left side and the right side of the optical film 20 are both provided with the lugs 21. As shown, Figure 1 As shown, the right side of the optical film 20 corresponds to the position C, and the left side of the optical film 20 corresponds to the position opposite to the position C. Wherein, the lower side of the backlight module 1 can be provided with a lamp bead or the like.

[0076] In some embodiments, the edges of the same side of the optical film 20 are provided with at least two lugs 21, so that the optical film 20 can be more stably fixed on the back plate 10.

[0077] As shown, Figure 8 According to the second aspect of the present application, a display terminal 2 is provided, the display terminal 2 comprises a display panel 3 and the backlight module 1 described above, and the display panel 3 is arranged on the side of the optical film 20 away from the bottom plate 11.

[0078] The display panel 3 is a liquid crystal panel, which is a non-self-luminous panel and needs to be provided with a planar light source by the backlight module 1. The display panel 3 can be arranged on the light-out surface of the backlight module 1, which is the side surface of the optical film 20 away from the bottom plate 11.

[0079] The display panel 3 can comprise a first substrate and a second substrate arranged oppositely and spaced apart, and a liquid crystal layer can be arranged between the first substrate and the second substrate. The side surface of the first substrate away from the second substrate can be provided with a first polarizing film, and the side surface of the second substrate away from the first substrate can be provided with a second polarizing layer.

[0080] The side edge of the display panel 3 is also provided with a binding member, which can be a chip on film, a flexible circuit board or the like. The binding member is arranged corresponding to the lower side of the backlight module 1.

[0081] In the present embodiment, the display terminal 2 can be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator or the like.

[0082] In the description of the application, the terms "first", "second", "third" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0083] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0084] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0085] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that, The application relates to a backlight module and a display panel. The backlight module comprises a backboard and an optical film. The backboard comprises a bottom plate and side plates located at the edges of the bottom plate, and the bottom plate and the side plates form a containing cavity. The optical film is arranged in the containing cavity, and the edges of the optical film extend in a direction away from the center of the optical film to form a plurality of lugs.

2. The backlight module of claim 1, wherein, The side plates are provided with a plurality of limiting grooves for containing the lugs, one lug corresponds to one limiting groove, and the depth of the edge area of the limiting groove is greater than the depth of the middle area of the limiting groove. The limiting groove comprises a side wall, a bottom wall and a transition wall connecting the side wall and the bottom wall, the transition wall is located at the edge area of the limiting groove, and the bottom wall is located at the middle area of the limiting groove.

3. The backlight module of claim 2, wherein, The transition wall is recessed towards the side close to the bottom plate relative to the bottom wall.

4. The backlight module of claim 2, wherein, The surface of the bottom wall comprises a plane, and the surface of the transition wall comprises a plane and / or a curved surface.

5. The backlight module of claim 2, wherein, The surface of the transition wall adjacent to the side wall is a circular arc surface.

6. The backlight module of claim 2, wherein, The distance between the surface of the bottom wall and the surface of the transition wall is greater than 0 mm and less than or equal to 0.5 mm.

7. The backlight module of claim 6, wherein, The lug comprises a bending part corresponding to the edge area of the limiting groove, and the bending part is bent towards the side close to the bottom plate or the side away from the bottom plate.

8. The backlight module of claim 7, wherein, The length of the bending part in the length direction of the side plate is less than or equal to the length of the transition wall in the length direction of the side plate.

9. The backlight module of claim 1, wherein, The maximum height of the lug in the depth direction of the limiting groove is less than or equal to the maximum depth of the limiting groove. The edges of the opposite sides of the optical film are provided with the lugs, or the edges of three sides of the optical film are provided with the lugs.

10. A display terminal, characterized by The edges of the same side of the optical film are provided with at least two lugs. The backlight module and the display panel are provided.

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