Backlight module, display panel, display device

Abstract

The disclosed embodiment provides a backlight module, comprising: a back plate, a light guide plate and an optical film layer; the back plate comprises a bottom plate and a side plate, the side plate is located at the edge of the bottom plate, and the bottom plate and the side plate are surrounded to form a containing space; the light guide plate and the optical film layer are stacked in sequence on the bottom plate, and are contained in the containing space; the backlight module corresponds to a display area and a frame area, and the frame area is located at the periphery of the display area; the light guide plate comprises a main body and a first limiting portion, the first limiting portion is arranged on a side of the main body facing the optical film layer, and the first limiting portion is at least partially located in the frame area; the first limiting portion is used to limit the position of the optical film layer; the orthographic projection of the first limiting portion on the bottom plate is at least partially located outside the edge of the bottom plate.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the field of display technology, and specifically relate to a backlight module, a display panel, and a display device. Background Art

[0002] With the development of automotive display technology, more and more customers are demanding narrower borders for display modules. Therefore, the borders of the backlight modules of display modules are also required to be narrower. Some customers require the borders of backlight modules to be less than 4mm. Unlike consumer display modules, automotive display modules need to face higher reliability and test requirements for mechanical shock experiments. Therefore, the requirements for the fixation of each film layer in the backlight film group are also higher. The fixation design of each film layer in the ultra-narrow border backlight module is more difficult. Summary of the invention

[0003] Embodiments of the present disclosure provide a backlight module, a display panel, and a display device.

[0004] In a first aspect, an embodiment of the present disclosure provides a backlight module, comprising: a back plate, a light guide plate and an optical film layer;

[0005] The back plate includes a bottom plate and a side plate, wherein the side plate is located at the edge of the bottom plate, and the bottom plate and the side plate are surrounded to form a containing space;

[0006] The light guide plate and the optical film layer are sequentially stacked on the bottom plate;

[0007] The backlight module corresponds to a display area and a frame area, and the frame area is located outside the display area;

[0008] The light guide plate comprises a main body and a first limiting portion, wherein the first limiting portion is arranged on a side of the main body facing the optical film layer, and the first limiting portion is at least partially located in the frame area; the first limiting portion is used to limit the position of the optical film layer;

[0009] The orthographic projection of the first limiting portion on the bottom plate is at least partially located outside the edge of the bottom plate.

[0010] In some embodiments, the side panel includes a first side panel and a second side panel; the first side panel and the second side panel are respectively located at different side edges of the bottom panel;

[0011] One side edge of the first side panel is connected to one side edge of the bottom panel, and the first side panel is a flat panel or a curved panel;

[0012] One side edge of the second side plate is connected to one side edge of the bottom plate, and the second side plate is a flat plate or a curved plate.

[0013] In some embodiments, a side edge of the main body portion close to the first side plate partially extends in a plane parallel to the bottom plate in a direction outside the accommodating space to form a first flange;

[0014] The first flange is located in the border area;

[0015] The orthographic projection of the first flange on the bottom plate at least partially overlaps with the orthographic projection of the first side plate on the bottom plate;

[0016] The first limiting portion is at least partially located on the first flange.

[0017] In some embodiments, a first notch is formed at one end of the first side plate away from the bottom plate at a position corresponding to the first flange;

[0018] At least a portion of the first flange is located in the first notch.

[0019] In some embodiments, the first side plate is provided with a through hole at a position corresponding to the first flange;

[0020] At least a portion of the first flange is located in the through hole.

[0021] In some embodiments, a thickness of the first flange in a direction away from the bottom plate is greater than 1 mm and is smaller than a thickness of other portions of the main body except the first flange in a direction away from the bottom plate.

[0022] In some embodiments, the first limiting portion extends in a direction away from the first flange;

[0023] A second notch is formed on one edge of the optical film layer close to the first side plate;

[0024] The first limiting portion is adapted to the shape of the second notch. Along the first direction of the first side panel away from the display area, the size of the second notch is larger than the size of the first limiting portion; along the second direction perpendicular to the first direction, the size of the second notch is consistent with the size of the first limiting portion.

[0025] In some embodiments, the orthographic projection of the first limiting portion on the bottom plate is at least partially located within the orthographic projection area of ​​the second notch on the bottom plate.

[0026] In some embodiments, the distance between an end surface of the first limiting portion away from the first flange and the bottom plate is greater than or equal to the distance between a surface of the optical film layer facing away from the light guide plate and the bottom plate.

[0027] In some embodiments, a first distance between an edge of a side of the display area close to the first side panel and the first side panel is greater than 0 mm and less than 4 mm.

[0028] In some embodiments, a distance between an edge of a side of the display area close to the first side panel and the first limiting portion is greater than 0 mm and less than the first distance.

[0029] In some embodiments, the backlight module further includes a light bar, and the light bar is arranged on a side of the second side plate close to the light guide plate;

[0030] The light bar comprises a substrate and a plurality of light sources arranged at intervals on the substrate; the light emitting surfaces of the light sources face the edge end surface of the light guide plate.

[0031] In some embodiments, a side edge of the main body portion close to the second side plate partially extends in a plane parallel to the bottom plate in a direction outside the accommodating space to form a second flange;

[0032] The second flange is located in the frame area, and at least a portion of the second flange is located in the interval between two adjacent light sources.

[0033] In some embodiments, the light guide plate further includes a second limiting portion; the second limiting portion is disposed on a side of the main body portion close to the optical film layer, and the second limiting portion is located in the frame area;

[0034] The second limiting portion is disposed on the second flange, and at least a portion of the second limiting portion is located in a gap between two adjacent light sources.

[0035] In some embodiments, the orthographic projection of an edge of one side of the main body close to the second side plate on the bottom plate is located on a side of the orthographic projection of the light source on the bottom plate away from the orthographic projection of the substrate on the bottom plate.

[0036] In some embodiments, the light guide plate further includes a second limiting portion; the second limiting portion is disposed on a side of the main body portion close to the optical film layer, and the second limiting portion is located in the frame area;

[0037] The orthographic projection of the second limiting portion on the bottom plate at least partially overlaps with the orthographic projection of a side edge of the main body close to the second side plate on the bottom plate; and at least a portion of the second limiting portion is located in the interval between two adjacent light sources.

[0038] In some embodiments, the second limiting portion extends in a direction away from the main body portion;

[0039] A third notch is formed on one edge of the optical film layer close to the second side plate;

[0040] The second limiting portion is adapted to the shape of the third notch. Along the third direction of the second side plate away from the display area, the size of the third notch is larger than the size of the second limiting portion; along the fourth direction perpendicular to the third direction, the size of the third notch is consistent with the size of the second limiting portion.

[0041] In some embodiments, the orthographic projection of the second limiting portion on the bottom plate is at least partially located within the orthographic projection area of ​​the third notch on the bottom plate.

[0042] In some embodiments, the distance between an end surface of the second limiting portion away from the second flange and the bottom plate is greater than or equal to the distance between a surface of the optical film layer facing away from the light guide plate and the bottom plate.

[0043] In some embodiments, a second distance between an edge of a side of the display area close to the second side panel and the second side panel is greater than 4 mm.

[0044] In some embodiments, a distance between a side edge of the display area close to the second side plate and the second limiting portion is greater than 4 mm and less than the second distance.

[0045] In some embodiments, the first limiting portion and the second limiting portion are located in the frame area on the same side outside the display area.

[0046] In some embodiments, the first side panel is perpendicular to the second side panel; and the first side panel is adjacent to the second side panel;

[0047] The number of the first side panels is two.

[0048] In some embodiments, the number of the first flanges is two, and the number of the first limiting portions is two;

[0049] The two first limiting portions are arranged in one-to-one correspondence with the two first side plates, and the distances between the two first limiting portions and the second side plates are equal.

[0050] In some embodiments, the number of the second flange is one, and the number of the second limiting portion is one.

[0051] In some embodiments, the orthographic projection of the second limiting portion on the bottom plate corresponds to a middle position of the orthographic projection of the second side plate on the bottom plate.

[0052] In some embodiments, it further includes a plastic frame, the plastic frame being disposed on the outer side of the back plate, the plastic frame wrapping a side of the first side plate and the second side plate away from the accommodating space;

[0053] The plastic frame also wraps the frame area to form the frame area and define the display area.

[0054] In a second aspect, an embodiment of the present disclosure further provides a display panel, comprising a display substrate and the above-mentioned backlight module; the backlight module is arranged on the light incident side of the display substrate, and is used to provide backlight for the display substrate.

[0055] In a third aspect, an embodiment of the present disclosure further provides a display device, comprising the above-mentioned display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing detailed example embodiments with reference to the accompanying drawings, in which:

[0057] Figure 1 It is a schematic diagram of the structure of the backlight module after disassembly and assembly in the disclosed technology;

[0058] Figure 2 It is a schematic top view of a partial structure of a backlight module in an embodiment of the present disclosure;

[0059] Figure 3 for Figure 2 A schematic cross-sectional view of the structure of the backlight module along the AA section line;

[0060] Figure 4 When the first side plate and the bottom plate form an angle of 135°, Figure 2 A schematic cross-sectional view of the structure of the backlight module along the AA section line;

[0061] Figure 5 This is a schematic diagram of the cooperation between the first limiting portion and the second notch in the embodiment of the present disclosure;

[0062] Figure 6 It is a schematic diagram of the orthographic projection of the first limiting portion and the second notch on the bottom plate in the embodiment of the present disclosure;

[0063] Figure 7 for Figure 2 Another structural cross-sectional diagram of the backlight module along the AA section line;

[0064] Figure 8 for Figure 2A schematic cross-sectional view of the structure of the backlight module along the BB section line;

[0065] Fig. 9 for Figure 2 Another structural cross-sectional view of the backlight module along the BB section line;

[0066] Fig.10 Schematic diagram of the cooperation between the second limiting portion and the third notch in the embodiment of the present disclosure;

[0067] Fig.11 It is a schematic diagram of the orthographic projection of the second limiting portion and the third notch on the bottom plate in the embodiment of the present disclosure;

[0068] Fig.12 for Figure 2 Another structural cross-sectional view of the backlight module along the BB section line;

[0069] Fig.13 It is a schematic top view of a partial structure of another backlight module in an embodiment of the present disclosure;

[0070] Fig.14 for Fig.13 A schematic cross-sectional view of the structure of the backlight module along the CC section line;

[0071] Fig.15 for Fig.13 An enlarged top view of part D in the middle;

[0072] Fig.16 It is a schematic diagram of the structural decomposition of the display panel in the embodiment of the present disclosure.

[0073] The accompanying drawings are denoted as follows:

[0074] 1. Back panel; 11. Bottom panel; 12. First side panel; 120. First notch; 121. Through hole; 13. Second side panel; 2. Light guide plate; 21. Main body; 210. First flange; 211. Second flange; 22. First limiting portion; 23. Second limiting portion; 3. Optical film layer; 31. Second notch; 32. Third notch; 101. Display area; 102. Frame area; 4. Light bar; 41. Base material; 42. Light source; 5. Rubber frame; 6. Reflector; 7. Display substrate; 8. Front frame. DETAILED DESCRIPTION

[0075] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a backlight module, a display panel, and a display device provided by the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0076] The embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, but the embodiments shown may be embodied in different forms and should not be construed as being limited to the embodiments set forth in the present disclosure. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0077] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings have schematic properties, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions, but are not intended to be limiting.

[0078] In the disclosed technology, refer to Figure 1 The backlight module includes a back panel 1, a reflective sheet 6 stacked on the back panel 1 in sequence, a light guide plate 2 and an optical film layer 3; the back panel 1 includes a bottom panel and side panels arranged around the bottom panel, the bottom panel and the side panels are arranged to form a containing space, the reflective sheet 6, the light guide plate 2 and the optical film layer 3 are located in the containing space; the backlight module also includes a light bar 4, the light bar 4 is arranged on the side panel, and the light emitting surface of the light source on the light bar 4 faces the edge end surface of the light guide plate 2, that is, a backlight module of an edge-entry backlight source. The backlight module also includes a glue frame 5, which wraps the edges and edge end faces of the optical film layer 3 and the light guide plate 2 in the backlight module to further fix the film layers in the backlight module and prevent light leakage from the edge of the backlight module; the edge areas of the backlight module wrapped by the glue frame 5 form a surrounding frame area 102 of the backlight module. Since the glue frame 5 is made of a light-shielding material, the frame area 102 of the backlight module is not transparent, while the middle area of ​​the backlight module surrounded by the surrounding frame area 102 is transparent, forming a display area 101 of the backlight module. The optical film layer 3 includes a plurality of film materials, such as a diffusion film, a lower light-enhancing film and an upper light-enhancing film, etc. The lower light-enhancing film and the upper light-enhancing film are used to make the light more uniform and soft and increase the brightening effect. The reflective sheet 6 is attached to the bottom plate; the optical film layer 3 is fixed in position by a fixing structure arranged on the light guide plate 2, so that it will not move relative to the light guide plate during the reliability test and when subjected to mechanical impact, thereby ensuring the good performance of the backlight module.

[0079] In the disclosed technology, in the backlight module of the vehicle-mounted display module, the optical film layer is fixed in the following manner: a boss is set at the edge of the light guide plate, a groove is opened at the edge of the optical film layer, and the position of the optical film layer relative to the light guide plate is limited by making the groove and the boss correspondingly engage.

[0080] The boss is located in the border area of ​​the backlight module, but the boss on the edge of the light guide plate is prone to produce bright spots when the backlight module is lit. When the border of the backlight module is relatively wide, the boss can be set on the edge of the light guide plate that is far away from the display area. At this time, the bright spot of the boss is not visible; but in the design of a narrow-border or ultra-narrow-border backlight module, the setting position of the boss on the edge of the light guide plate is limited, and the boss cannot be farther away from the display area. At this time, the bright spot of the boss is obviously visible under a certain viewing angle, affecting the picture quality of the display module. For example: the light source is set on a side panel parallel to the X-axis direction. Since the binding wiring area of ​​the display module is usually set on this side, the border of the backlight module corresponding to the side panel is wider, such as a border width of 4mm, and the borders of the other sides of the backlight module except this side are narrow or ultra-narrow, such as a border width of less than 4mm. When the distance between the convex platform and the display area along the X-axis direction is small, or when the distance between the convex platform and the display area along the Y-axis direction is less than 0, a bright spot of the convex platform will be seen under a certain viewing angle (such as a larger viewing angle, such as a viewing angle greater than 45°), affecting the image quality.

[0081] The bright spots of the bosses can be slightly improved by reducing the size of the bosses on the light guide plate to increase the distance between it and the display area. However, if the size of the bosses is too small, it will affect the strength of the bosses. There is a risk of the bosses breaking during mechanical vibration tests, which can easily cause new defects.

[0082] In view of the above problems existing in the backlight module in the disclosed technology, the present disclosure provides a backlight module, referring to Figure 2-Figure 3 , including: a back plate 1, a light guide plate 2 and an optical film layer 3; the back plate 1 includes a bottom plate 11 and a side plate, the side plate is located at the edge of the bottom plate 11, and the bottom plate 11 and the side plate are surrounded to form an accommodating space; the light guide plate 2 and the optical film layer 3 are stacked on the bottom plate 11 in sequence; the backlight module corresponds to a display area 101 and a frame area 102, and the frame area 102 is located at the periphery of the display area 101; the light guide plate 2 includes a body 21 and a first limiting portion 22, the first limiting portion 22 is arranged on the side of the body 21 facing the optical film layer 3, and the first limiting portion 22 is at least partially located in the frame area 102; the first limiting portion 22 is used to limit the position of the optical film layer 3; the orthographic projection of the first limiting portion 22 on the bottom plate 11 is at least partially located outside the edge of the bottom plate 11. The area where the orthographic projection of the side plate on the plane where the bottom plate is located is defined as being located outside the edge of the bottom plate.

[0083] By making the orthographic projection of the first limiting portion 22 on the bottom plate 11 at least partially located outside the edge of the bottom plate 11, the setting area of ​​the first limiting portion 22 can be extended from the accommodating space to the edge of the bottom plate 11 or even outside the edge of the bottom plate 11, so that the setting position of the first limiting portion 22 can be further away from the display area 101 compared with the disclosed technology, thereby improving or avoiding the situation where the bright spot at the first limiting portion 22 is seen when the backlight module is turned on.

[0084] In some embodiments, the side panel includes a first side panel 12 and a second side panel 13; the first side panel 12 and the second side panel 13 are respectively located at different side edges of the bottom panel 11; one side edge of the first side panel 12 is connected to one side edge of the bottom panel 11, and the first side panel 12 is a plane panel; the first side panel 12 and the bottom panel 11 form an angle greater than or equal to 90° and less than 180°; one side edge of the second side panel 13 is connected to one side edge of the bottom panel 11, and the second side panel 13 is a plane panel; the second side panel 13 and the bottom panel 11 form an angle greater than or equal to 90° and less than 180°. Figure 4 The first side plate 12 and the bottom plate 11 form an angle of 135°.

[0085] In some embodiments, the first side plate 12 is perpendicular to the second side plate 13. In some embodiments, the first side plate 12 is adjacent to the second side plate 13. The first side plate 12 and the second side plate 13 are connected in abutment with each other.

[0086] In some embodiments, there are two first side panels 12. There is one second side panel 13. The two first side panels 12 are adjacent to and perpendicular to the second side panel 13 and are butted against each other.

[0087] In some embodiments, the first side panel 12 is a curved panel, such as the first side panel 12 is a curved panel that is curved away from the display area 101; the first side panel 12 may also be a wavy curved panel or a curved panel of other shapes. The second side panel 13 is a curved panel, such as the first side panel 12 is a curved panel that is curved away from the display area 101; the second side panel 12 may also be a wavy curved panel or a curved panel of other shapes.

[0088] In this embodiment, in order to minimize the width of the backlight module frame area 102 , the first side plate 12 and the bottom plate 11 form an angle of 90°; the second side plate 13 and the bottom plate 11 form an angle of 90°.

[0089] In some embodiments, a side edge of the main body 21 close to the first side plate 12 partially extends in a plane parallel to the bottom plate 11 in a direction outside the accommodation space to form a first flange 210; the first flange 210 is located in the frame area 102; the orthographic projection of the first flange 210 on the bottom plate 11 overlaps at least partially with the orthographic projection of the first side plate 12 on the bottom plate 11; the first limiter 22 is at least partially located on the first flange 210. Among them, the first flange 210 can support the first limiter 22. The main body 21 of the light guide plate 2 extends in a direction outside the accommodation space to form the first flange 210, so that the setting area of ​​the first limiter 22 is extended and expanded relative to the disclosed technology. Since the setting area of ​​the first limiter 22 extends and expands in a direction outside the accommodation space relative to the disclosed technology, the setting position of the first limiter 22 can be further away from the display area 101 relative to the disclosed technology, thereby improving or avoiding the situation where the bright spot at the first limiter 22 is seen when the backlight module is lit.

[0090] In some embodiments, reference Figure 2 and Figure 3 The first side plate 12 has an end away from the bottom plate 11 and a first notch 120 at a position corresponding to the first flange 210; at least a portion of the first flange 210 is located in the first notch 120. That is, the setting area of ​​the first position-limiting portion 22 is extended to the first notch 120 compared with the disclosed technology, so that the setting position of the first position-limiting portion 22 is further away from the display area 101 compared with the disclosed technology, thereby improving or avoiding the situation where the bright spot at the first position-limiting portion 22 is visible when the backlight module is lit.

[0091] In some embodiments, the thickness N of the first flange 210 in the direction away from the bottom plate 11 is greater than 1 mm and less than the thickness N1 of other parts of the body 21 except the first flange 210 in the direction away from the bottom plate 11. In this way, the strength of the first flange 210 can be ensured, so that the first flange 210 is sufficient to support the first limiting portion 22.

[0092] In some embodiments, reference Figure 5 , the first position-limiting portion 22 extends in a direction L1 away from the first flange 210; a second notch 31 is provided at a side edge of the optical film layer 3 close to the first side plate 12; the first position-limiting portion 22 and the second notch 31 are matched in shape, and along the first direction E1 away from the display area 101 of the first side plate 12, the size of the second notch 31 is larger than the size of the first position-limiting portion 22; along the second direction E2 perpendicular to the first direction E1, the size of the second notch 31 is consistent with the size of the first position-limiting portion 22. In this way, along the first direction E1, the optical film layer 3 has redundant space for deformation in the case of thermal expansion and contraction; along the second direction E2, the optical film layer 3 is fixed relative to the light guide plate 2.

[0093] In some embodiments, the orthographic projection of the first position-limiting portion 22 on the bottom plate 11 is at least partially located within the orthographic projection area of ​​the second notch 31 on the bottom plate 11. In this way, the second notch 31 and the first position-limiting portion 22 can cooperate with each other.

[0094] In some embodiments, reference Figure 6 , the orthographic projections of the first limiter 22 on the bottom plate 11 are all located within the orthographic projection area of ​​the second notch 31 on the bottom plate 11. This can better prevent the first limiter 22 from escaping from the second notch 31 during the mechanical vibration test, thereby better ensuring that the position of the optical film layer 3 relative to the light guide plate 2 is fixed.

[0095] In some embodiments, reference Figure 7 The distance between the end surface of the first limiting portion 22 away from the first flange 210 and the bottom plate 11 is equal to the distance between the side surface of the optical film layer 3 away from the light guide plate 2 and the bottom plate 11.

[0096] In some embodiments, reference Figure 3 A distance h1 between an end surface of the first limiting portion 22 away from the first flange 210 and the bottom plate 11 is greater than a distance h2 between a surface of the optical film layer 3 away from the light guide plate 2 and the bottom plate 11 .

[0097] In some embodiments, reference Figure 2 and Figure 3 , a first distance a1 between a side edge of the display area 101 close to the first side plate 12 and the first side plate 12 is greater than 0 mm and less than 4 mm. The first distance a1 is the net width of a side frame area 102 of the backlight module excluding the first side plate 12 and the plastic frame. The net width of the frame area 102 makes the side frame of the backlight module a narrow frame.

[0098] In some embodiments, the distance a2 between the edge of one side of the display area 101 close to the first side plate 12 and the first limiting portion 22 is greater than 0 mm and less than the first distance a1. The distance a2 is the distance between the edge of one side of the display area 101 close to the first side plate 12 and the side of the first limiting portion 22 close to the display area 101.

[0099] In some embodiments, reference Figure 2 and Figure 8 The backlight module also includes a light bar 4, which is arranged on a side of the second side plate 13 close to the light guide plate 2; the light bar 4 includes a substrate 41 and a plurality of light sources 42 arranged at intervals on the substrate 41; the light emitting surface of the light source 42 faces the edge end surface of the light guide plate 2.

[0100] In some embodiments, a side edge of the main body 21 close to the second side panel 13 partially extends in a plane parallel to the bottom panel 11 in a direction outside the accommodating space to form a second flange 211; the second flange 211 is located in the border area 102, and at least a portion of the second flange 211 is located in the gap between two adjacent light sources 42.

[0101] In some embodiments, the light guide plate 2 further includes a second limiting portion 23; the second limiting portion 23 is disposed on a side of the main body 21 close to the optical film layer 3, and the second limiting portion 23 is located in the frame area 102; the second limiting portion 23 is disposed on the second flange 211, and at least part of the second limiting portion 23 is located in the interval between two adjacent light sources 42. The second flange 211 can support the second limiting portion 23.

[0102] The main body 21 of the light guide plate 2 extends in a direction outside the accommodating space to form a second flange 211, so that the setting area of ​​the second limiting portion 23 can be extended and expanded relative to the disclosed technology. By making at least a portion of the second flange 211 located in the gap between two adjacent light sources 42, the setting area of ​​the second limiting portion 23 can be extended and expanded to the gap between two adjacent light sources 42 relative to the disclosed technology, up to the surface of the substrate 41, so that the setting position of the second limiting portion 23 can be further away from the display area 101 relative to the disclosed technology, thereby improving or avoiding the situation where the bright spot at the second limiting portion 23 is seen when the backlight module is turned on.

[0103] In some embodiments, reference Fig. 9 The orthogonal projection of the edge of the main body 21 close to the second side plate 13 on the bottom plate 11 is located on the side of the orthogonal projection of the light source 42 on the bottom plate 11 away from the orthogonal projection of the substrate 41 on the bottom plate 11. That is, the second flange may not be formed on the main body 21.

[0104] In some embodiments, an edge of one side of the body portion 21 close to the second side plate 13 is parallel to the second side plate 13 .

[0105] In some embodiments, reference Fig. 9 The light guide plate 2 also includes a second limiting portion 23; the second limiting portion 23 is arranged on a side of the main body 21 close to the optical film layer 3, and the second limiting portion 23 is located in the frame area 102; the orthographic projection of the second limiting portion 23 on the bottom plate 11 at least partially overlaps with the orthographic projection of a side edge of the main body 21 close to the second side plate 13 on the bottom plate 11; and at least a portion of the second limiting portion 23 is located in the interval between two adjacent light sources 42.

[0106] Reference Fig. 9By making at least a portion of the second limiting portion 23 located in the gap between two adjacent light sources 42, the second limiting portion 23 can be extended to the gap between two adjacent light sources 42 relative to the disclosed technology, to the surface of the substrate 41, so that the second limiting portion 23 can be further away from the display area 101 relative to the disclosed technology, thereby improving or avoiding the situation where the bright spot at the second limiting portion 23 is seen when the backlight module is turned on.

[0107] In some embodiments, reference Fig.10 , the second position-limiting portion 23 extends in a direction L2 away from the main body 21; a third notch 32 is provided at a side edge of the optical film layer 3 close to the second side plate 13; the second position-limiting portion 23 and the third notch 32 are matched in shape, and along the third direction E3 of the second side plate 13 away from the display area 101, the size of the third notch 32 is larger than the size of the second position-limiting portion 23; along the fourth direction E4 perpendicular to the third direction E3, the size of the third notch 32 is consistent with the size of the second position-limiting portion 23. In this way, the optical film layer 3 has redundant space for deformation in the case of thermal expansion and contraction along the third direction E3; and the optical film layer 3 is fixed relative to the light guide plate 2 along the fourth direction E4.

[0108] In some embodiments, the orthographic projection of the second position-limiting portion 23 on the bottom plate 11 is at least partially located within the orthographic projection area of ​​the third notch 32 on the bottom plate 11. In this way, the third notch 32 and the second position-limiting portion 23 can cooperate with each other.

[0109] In some embodiments, reference Fig.11 , the orthographic projections of the second position-limiting portion 23 on the bottom plate 11 are all located within the orthographic projection area of ​​the third notch 32 on the bottom plate 11. This can better prevent the second position-limiting portion 23 from escaping from the third notch 32 during the mechanical vibration test, thereby better ensuring that the position of the optical film layer 3 relative to the light guide plate 2 is fixed.

[0110] In some embodiments, reference Fig.12 The distance between the end surface of the second limiting portion 23 away from the second flange 211 and the bottom plate 11 is equal to the distance between the side surface of the optical film layer 3 away from the light guide plate 2 and the bottom plate 11.

[0111] In some embodiments, reference Figure 8 The distance h3 between the end surface of the second limiting portion 23 away from the second flange 211 and the bottom plate 11 is greater than the distance h4 between the side surface of the optical film layer 3 away from the light guide plate 2 and the bottom plate 11.

[0112] In some embodiments, reference Figure 2 and Figure 8, a second spacing a3 between the side edge of the display area 101 close to the second side plate 13 and the second side plate 13 is greater than 4 mm. The second spacing a3 is the net width of the corresponding side frame area 102 of the backlight module excluding the second side plate 13 and the plastic frame. Since the binding wiring area of ​​the display module is usually set on this side, the net width of the frame area on the side corresponding to the backlight module is set wider.

[0113] In some embodiments, the distance a4 between the edge of one side of the display area 101 close to the second side plate 13 and the second limiting portion 23 is greater than 4 mm and less than the second distance a3. The distance a4 is the distance between the edge of one side of the display area 101 close to the second side plate 13 and the side of the second limiting portion 23 close to the display area 101.

[0114] In some embodiments, the first side plate 12 is perpendicular to the second side plate 13. By arranging the first limiting portion 22 and the second limiting portion 23 on opposite sides of the first side plate 12 and the second side plate 13 which are perpendicular to each other, the optical film layer 3 can be fixed in two perpendicular directions, so that the optical film layer 3 will not move relative to the light guide plate 2 during the reliability test and the mechanical vibration test, thereby achieving a firm fixation of the optical film layer 3 and good optical performance of the backlight module.

[0115] In some embodiments, the first side plate 12 is adjacent to the second side plate 13. The first side plate 12 and the second side plate 13 are connected in abutment with each other.

[0116] In some embodiments, there are two first side panels 12. There is one second side panel 13. The two first side panels 12 are adjacent to and perpendicular to the second side panel 13 and are butted against each other.

[0117] In some embodiments, there are two first flanges 210 and two first stoppers 22; the two first stoppers 22 are arranged one-to-one with the two first side panels 12, and the distances between the two first stoppers 22 and the second side panels 13 are equal. The arrangement of the two first flanges 210 and the two first stoppers 22 can further ensure that the position of the optical film layer 3 relative to the light guide plate 2 is fixed in the reliability test and the mechanical vibration test, and can ensure the fixing strength of the first stoppers 22; at the same time, it can also ensure that the optical film layer 3 can freely expand and contract when it expands and contracts due to heat and cold under the fixation of the first stoppers 22, thereby preventing the optical film layer 3 from generating wrinkles.

[0118] In some embodiments, the number of the second flange 211 is one, and the number of the second stopper 23 is one. The provision of one second flange 211 and one second stopper 23 can further ensure that the position of the optical film layer 3 relative to the light guide plate 2 is fixed in the reliability test and the mechanical vibration test, and can ensure the fixing strength of the second stopper 23; at the same time, it can also ensure that the optical film layer 3 can freely expand and contract when it expands and contracts due to heat and cold under the fixation of the second stopper 23, thereby preventing the optical film layer 3 from generating wrinkles.

[0119] In some embodiments, the orthographic projection of the second limiting portion 23 on the bottom plate 11 corresponds to a middle position of the orthographic projection of the second side plate 13 on the bottom plate 11 .

[0120] In some embodiments, reference Figure 2 , the first limiting portion 22 and the second limiting portion 23 are located in the same side frame area 102 outside the display area 101. The same side frame area 102 outside the display area 101 may refer to being located on the same side of a straight line where an edge of the display area 101 is located. For example, the first limiting portion 22 and the second limiting portion 23 are located in the lower frame area 102 outside the display area 101. Since the lower frame area 102 is provided with a light bar 4, and the binding wiring area of ​​the display module is usually provided on this side, the net width of the frame area 102 on this side of the backlight module is set wider. In this embodiment, three limiting portions are arranged on the edge positions of the light guide plate 3; one second limiting portion 23 is located on one side edge of the light guide plate 3 corresponding to the second side plate 13, and two first limiting portions 22 are respectively located on two side edges of the light guide plate 3 corresponding to the two first side plates 12; the two first limiting portions 22 are used to limit the movement of the optical film layer 3 in the vertical direction, and the one second limiting portion 23 is used to limit the movement of the optical film layer 3 in the horizontal direction; in this way, the risks of wrinkles on the optical film layer in the reliability test and scratches on the optical film layer in the mechanical vibration test can be effectively avoided.

[0121] In some embodiments, the backlight module may be a quadrilateral, such as a rectangle; it may also be an irregular quadrilateral or polygon; it may also be any shape, such as a circle, an ellipse, etc.

[0122] In some embodiments, reference Figure 3 and Figure 8The backlight module also includes a plastic frame 5, which is arranged on the outside of the back plate 1, and the plastic frame 5 wraps the first side plate 12 and the second side plate 13 on the side away from the accommodating space; the plastic frame 5 also wraps the frame area 102 to form the frame area 102 and define the display area 101. Since the plastic frame 5 is made of a light-shielding material, the frame area 102 of the backlight module is not light-transmissive, while the middle display area 101 surrounded by the frame areas 102 is light-transmissive. At the same time, the plastic frame 5 can block the first notch 120 opened on the first side plate 12, thereby preventing the light emitted by the light source 42 from leaking from the first notch 120; the plastic frame 5 can further fix the film layers in the backlight module, and at the same time prevent light leakage from the edge of the backlight module.

[0123] In some embodiments, reference Figure 3 The backlight module also includes a reflective sheet 6, which is arranged on a side of the bottom plate 11 facing the light guide plate 2, and is used to reflect the light irradiated thereon, so that the reflected light enters the light guide plate 2, thereby improving the utilization rate of the light.

[0124] In some embodiments, the light source 42 is an LED lamp bead. Of course, the light source 42 can also be other light-emitting elements, such as an incandescent lamp, an OLED light-emitting element, etc.

[0125] The present disclosure also provides a backlight module, which is different from the above embodiments in that: Fig.13 and Fig.14 The first side plate 12 is provided with a through hole 121 at a position corresponding to the first flange 210 ; at least a portion of the first flange 210 is located in the through hole 121 ; and at least a portion of the first limiting portion 22 is located in the through hole 121 .

[0126] Among them, the setting area of ​​the first limiting portion 22 extends into the through hole 121 compared with the disclosed technology, so that the setting position of the first limiting portion 22 is farther away from the display area 101 compared with the disclosed technology, thereby improving or avoiding the situation where the bright spot at the first limiting portion 22 is seen when the backlight module is turned on.

[0127] In some embodiments, part of the first limiting portion 22 is located in the through hole 121. The thickness s1 of the portion of the first limiting portion 22 located in the through hole 121 along the direction L1 away from the first flange 210 is smaller than the thickness s2 of the portion of the first limiting portion 22 located outside the through hole 121 along the direction L1 away from the first flange 210.

[0128] Reference Fig.15In order to facilitate the installation of the optical film layer 3, the portion of the optical film layer 3 surrounding the second notch 31 only surrounds the periphery of the portion of the first limiting portion 22 located outside the through hole 121. In order to prevent the first limiting portion 22 from escaping from the second notch 31 during the mechanical vibration test, the size of the portion of the first limiting portion 22 located outside the through hole 121 in the direction away from the display area 101 can be set to be larger than the size of the portion of the first limiting portion 22 located in the through hole 121 in the direction away from the display area 101.

[0129] The other structures of the backlight module in the disclosed embodiment are the same as those in the above-mentioned embodiment and will not be described again here.

[0130] The backlight module provided in the embodiment of the present disclosure makes the orthographic projection of the first limiting portion 22 on the bottom plate 11 at least partially overlap with the edge of the bottom plate 11, so that the optical film layer 3 is limited and fixed in one direction, and the setting area of ​​the first limiting portion 22 can be extended from the accommodating space to the edge of the bottom plate 11 or even beyond the edge of the bottom plate 11, so that the setting position of the first limiting portion 22 can be further away from the display area 101 compared with the disclosed technology, thereby improving or avoiding the situation where the bright spot at the first limiting portion 22 is seen when the backlight module is lit; by making the main body 21 of the light guide plate 2 extend in the direction outside the accommodating space to form the second flange 211, the setting of the second limiting portion 23 can be The area is extended and expanded relative to that in the disclosed technology. By making at least a portion of the second flange 211 located in the gap between two adjacent light sources 42, the setting area of ​​the second limiting portion 23 can be extended and expanded relative to that in the disclosed technology to the gap between two adjacent light sources 42, up to the surface of the substrate 41, so that the setting position of the second limiting portion 23 can be further away from the display area 101 relative to that in the disclosed technology, thereby improving or avoiding the situation where the bright spot at the second limiting portion 23 is seen when the backlight module is turned on; at the same time, the second limiting portion 23 can also be used to limit and fix the optical film layer 3 in another direction. The setting of the first limiting portion 22 and the second limiting portion 23 can ensure the limiting and fixation of the optical film layer 3 as well as the fixing strength.

[0131] The present disclosure also provides a display panel, referring to Fig.16 , including a display substrate 7, and also including the backlight module in the above-mentioned disclosed embodiment; the backlight module is arranged on the light incident side of the display substrate 7, and is used to provide backlight for the display substrate 7.

[0132] In some embodiments, the display panel may be a liquid crystal display panel, that is, the display substrate 7 is a liquid crystal cell composed of an upper and a lower substrate and filled with liquid crystal in the middle.

[0133] In some embodiments, the display panel further includes a front frame 8, which wraps around the edges and edge end faces of the display substrate 7 to protect the display substrate 7 and also forms a frame of the display substrate 7 to make the entire display panel more beautiful.

[0134] The display panel provided in the embodiments of the present disclosure can improve the quality and display effect of the display panel by adopting the backlight module in the above-mentioned embodiments of the disclosure.

[0135] The present disclosure also provides a display device, comprising the display panel in the above disclosed embodiment.

[0136] The display device provided in the embodiments of the present disclosure can improve the quality and display effect of the display device by adopting the display panel in the above-mentioned embodiments of the disclosure.

[0137] The display device provided in the embodiments of the present disclosure may be any product or component with a display function, such as an LCD panel, an LCD television, a monitor, a mobile phone, a navigator, or the like.

[0138] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A backlight module, comprising: Backplane, light guide plate and optical film layer; The back plate includes a bottom plate and a side plate, wherein the side plate is located at the edge of the bottom plate, and the bottom plate and the side plate are surrounded to form a containing space; The light guide plate and the optical film layer are sequentially stacked on the bottom plate; The backlight module corresponds to a display area and a frame area, and the frame area is located outside the display area; The light guide plate comprises a main body and a first limiting portion, wherein the first limiting portion is arranged on a side of the main body facing the optical film layer, and the first limiting portion is at least partially located in the frame area; the first limiting portion is used to limit the position of the optical film layer; The orthographic projection of the first limiting portion on the bottom plate is at least partially located outside the edge of the bottom plate; The side panel comprises a first side panel and a second side panel; the first side panel and the second side panel are respectively located at different side edges of the bottom panel; the first side panel and the second side panel are butted against each other; A side edge of the main body portion close to the first side plate partially extends in a plane parallel to the bottom plate in a direction outside the accommodating space to form a first flange; The first flange is located in the border area; The orthographic projection of the first flange on the bottom plate at least partially overlaps with the orthographic projection of the first side plate on the bottom plate; The first limiting portion is at least partially located on the first flange.

2. The backlight module according to claim 1, characterized in that: One side edge of the first side panel is connected to one side edge of the bottom panel, and the first side panel is a flat panel or a curved panel; One side edge of the second side plate is connected to one side edge of the bottom plate, and the second side plate is a flat plate or a curved plate.

3. The backlight module according to claim 2, characterized in that: A first notch is formed at one end of the first side plate away from the bottom plate at a position corresponding to the first flange; At least a portion of the first flange is located in the first notch.

4. The backlight module according to claim 2, characterized in that: The first side plate is provided with a through hole at a position corresponding to the first flange; At least a portion of the first flange is located in the through hole.

5. The backlight module according to claim 3, characterized in that: The thickness of the first flange in a direction away from the bottom plate is greater than 1 mm and is smaller than the thickness of other parts of the main body except the first flange in the direction away from the bottom plate.

6. The backlight module according to claim 3 or 4, characterized in that: The first limiting portion extends in a direction away from the first flange; A second notch is formed on one edge of the optical film layer close to the first side plate; The first limiting portion is adapted to the shape of the second notch. Along the first direction of the first side plate away from the display area, the size of the second notch is larger than the size of the first limiting portion; along the second direction perpendicular to the first direction, the size of the second notch is consistent with the size of the first limiting portion.

7. The backlight module according to claim 6, characterized in that: The orthographic projection of the first limiting portion on the bottom plate is at least partially located within the orthographic projection area of ​​the second notch on the bottom plate.

8. The backlight module according to claim 7, characterized in that: The distance between an end surface of the first limiting portion away from the first flange and the bottom plate is greater than or equal to the distance between a surface of the optical film layer facing away from the light guide plate and the bottom plate.

9. The backlight module according to claim 6, characterized in that: A first distance between an edge of a side of the display area close to the first side panel and the first side panel is greater than 0 mm and less than 4 mm.

10. The backlight module according to claim 9, characterized in that: A distance between an edge of a side of the display area close to the first side plate and the first limiting portion is greater than 0 mm and less than the first distance.

11. The backlight module according to claim 6, characterized in that: The backlight module further comprises a light bar, and the light bar is arranged on a side of the second side plate close to the light guide plate; The light bar comprises a substrate and a plurality of light sources arranged at intervals on the substrate; the light emitting surfaces of the light sources face the edge end surface of the light guide plate.

12. The backlight module according to claim 11, characterized in that: A side edge of the main body portion close to the second side plate partially extends in a plane parallel to the bottom plate in a direction outside the accommodating space to form a second flange; The second flange is located in the frame area, and at least a portion of the second flange is located in the interval between two adjacent light sources.

13. The backlight module according to claim 12, characterized in that: The light guide plate further includes a second limiting portion; the second limiting portion is disposed on a side of the main body portion close to the optical film layer, and the second limiting portion is located in the frame area; The second limiting portion is disposed on the second flange, and at least a portion of the second limiting portion is located in a gap between two adjacent light sources.

14. The backlight module according to claim 11, characterized in that: The orthographic projection of one side edge of the main body portion close to the second side plate on the bottom plate is located on a side of the orthographic projection of the light source on the bottom plate away from the orthographic projection of the substrate on the bottom plate.

15. The backlight module according to claim 14, characterized in that: The light guide plate further includes a second limiting portion; the second limiting portion is disposed on a side of the main body portion close to the optical film layer, and the second limiting portion is located in the frame area; The orthographic projection of the second limiting portion on the bottom plate at least partially overlaps with the orthographic projection of a side edge of the main body close to the second side plate on the bottom plate; and at least a portion of the second limiting portion is located in the interval between two adjacent light sources.

16. The backlight module according to claim 13 or 15, characterized in that: The second limiting portion extends in a direction away from the main body portion; A third notch is formed on one edge of the optical film layer close to the second side plate; The second limiting portion is adapted to the shape of the third notch. Along the third direction of the second side plate away from the display area, the size of the third notch is larger than the size of the second limiting portion; along the fourth direction perpendicular to the third direction, the size of the third notch is consistent with the size of the second limiting portion.

17. The backlight module according to claim 16, characterized in that: The orthographic projection of the second limiting portion on the bottom plate is at least partially located within the orthographic projection area of ​​the third notch on the bottom plate.

18. The backlight module according to claim 13, characterized in that: The distance between the end surface of the second limiting portion away from the second flange and the bottom plate is greater than or equal to the distance between the side surface of the optical film layer away from the light guide plate and the bottom plate.

19. The backlight module according to claim 17, characterized in that: A second distance between a side edge of the display area close to the second side panel and the second side panel is greater than 4 mm.

20. The backlight module according to claim 19, characterized in that: A distance between an edge of a side of the display area close to the second side plate and the second limiting portion is greater than 4 mm and less than the second distance.

21. The backlight module according to claim 16, characterized in that: The first limiting portion and the second limiting portion are located in the frame area on the same side outside the display area.

22. The backlight module according to claim 16, characterized in that: The first side plate is perpendicular to the second side plate; and the first side plate is adjacent to the second side plate; The number of the first side panels is two.

23. The backlight module according to claim 22, characterized in that: The number of the first flanges is two, and the number of the first limiting portions is two; The two first limiting portions are arranged in one-to-one correspondence with the two first side plates, and the distances between the two first limiting portions and the second side plates are equal.

24. The backlight module according to claim 18, characterized in that: The number of the second flange is one, and the number of the second limiting portion is one.

25. The backlight module according to claim 16, characterized in that: The orthographic projection of the second limiting portion on the bottom plate corresponds to a middle position of the orthographic projection of the second side plate on the bottom plate.

26. The backlight module according to claim 25, characterized in that: It also includes a plastic frame, which is arranged on the outer side of the back plate, and the plastic frame wraps the first side plate and the second side plate on a side away from the accommodating space; The plastic frame also wraps the frame area to form the frame area and define the display area.

27. A display panel, comprising a display substrate, characterized in that: It also includes the backlight module according to any one of claims 1 to 26; the backlight module is arranged on the light incident side of the display substrate to provide backlight for the display substrate.

28. A display device, characterized in that: Comprising the display panel as claimed in claim 27.

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