Backlight module and display device

Abstract

The utility model relates to the technical field of display, and discloses a backlight module and a display device.The backlight module comprises a light guide plate, a light source and a light path folding assembly, the light source is located on the side, away from a light-emitting face, of the light guide plate, and the light path folding assembly is located on the light-in side of the light guide plate; and the light guide plate is used for reflecting light from the light source to the light incident surface of the light guide plate. As the light source is located on the side of the light guide plate away from the light-emitting surface and does not occupy the lateral upward space of the light guide plate, a frame does not need to shield the light source at the lateral position of the light guide plate, and the frame width of the side where the light source is located can be reduced; the light path folding assembly located on the light inlet side of the light guide plate is used for reflecting the light from the light source to the light inlet face of the light guide plate, and the light emitted by the light source can be guided into the light guide plate to provide backlight.

Description

Technical Field

[0001] The utility model relates to the technical field of display, and in particular to a backlight module and a display device. Background Art

[0002] At present, consumer electronic products are pursuing the ultimate display ratio, and narrow-border panels are the main development direction that has emerged. Narrow-border module products require both the display panel and the backlight to achieve an extremely narrow-border design at the same time.

[0003] There are two main types of existing backlight design solutions: positive backlight design solution and inverted backlight design solution. With the development of technical capabilities, the positive backlight design solution is limited to the bonding of flexible circuit boards due to its glue position. Even if the size is reduced to the minimum process, it obviously cannot meet the requirements of narrow frame design. Although the inverted backlight design solution can narrow the frame to a certain extent by inverting the flexible circuit board of the light source on the back panel, the light source still occupies a certain space, making the frame width still relatively large. Utility Model Content

[0004] The utility model discloses a backlight module and a display device, which are used for reducing the width of a frame.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] In a first aspect, a backlight module is provided, which includes: a light guide plate, a light source, and a light path folding component, wherein the light source is located on the side of the light guide plate away from the light emitting surface, and the light path folding component is located on the light incident side of the light guide plate and is used to reflect light from the light source to the light incident surface of the light guide plate.

[0007] In the above-mentioned backlight module, since the light source is located on the side of the light guide plate away from the light emitting surface and does not occupy the space on the side of the light guide plate, there is no need for a frame to block the light source on the side of the light guide plate, and the width of the frame on the side where the light source is located can be reduced; by utilizing an optical path folding component located on the light incident side of the light guide plate to reflect light from the light source to the light incident surface of the light guide plate, the light emitted by the light source can be guided into the light guide plate to provide backlight.

[0008] Optionally, the optical path folding component has a first reflecting surface and a second reflecting surface set at an angle, and the opening formed by the first reflecting surface and the second reflecting surface faces the light incident surface of the light guide plate; the light from the light source is reflected from the first reflecting surface and the second reflecting surface in sequence to the light incident surface of the light guide plate.

[0009] Optionally, an included angle α between the first reflecting surface and the second reflecting surface is greater than zero and less than or equal to 90°.

[0010] Optionally, the optical path folding assembly includes a first sheet-like reflective structure and a second sheet-like reflective structure with an included angle of α; the surface of the first sheet-like reflective structure close to the second sheet-like reflective structure forms the first reflective surface, and the surface of the second sheet-like reflective structure close to the first sheet-like reflective structure forms the second reflective surface.

[0011] Optionally, the first sheet-like reflective structure and the second sheet-like reflective structure are both flexible reflective structures, the backlight module further includes a supporting frame, and the flexible reflective structure is attached to the supporting frame.

[0012] Optionally, the flexible reflective structure includes a reflective sheet or a reflective adhesive strip.

[0013] Optionally, the backlight module also includes an optical device, which has a first surface, a second surface and a third surface, the first reflective surface is attached to the first surface, the second reflective surface is attached to the second surface, and the light incident surface of the light guide plate and the light emitting surface of the light source are both attached to the third surface.

[0014] Optionally, the backlight module further includes a back plate and a flexible circuit board, the support frame is fixed to the back plate, the flexible circuit board is attached to the back plate, and the light source is welded to the flexible circuit board.

[0015] Optionally, along the thickness direction of the light guide plate, one end of the optical device abuts against the flexible circuit board, and the other end is flush with the light emitting surface of the light guide plate.

[0016] Optionally, both the first surface and the second surface are provided with microstructures for reflecting light from the light source to the light incident surface of the light guide plate.

[0017] Optionally, the microstructure is a convex structure or a concave structure.

[0018] Optionally, the microstructure is hemispherical, semi-cylindrical or wedge-shaped.

[0019] Optionally, the optical device is made of one or more of polycarbonate, polymethyl methacrylate and polystyrene.

[0020] Optionally, the first sheet-like reflective structure and the second sheet-like reflective structure are both rigid reflective lenses.

[0021] Optionally, the optical path folding assembly includes a prism, one inner surface of the prism forms the first reflecting surface, and the other inner surface forms the second reflecting surface.

[0022] Optionally, the light path folding component has a concave reflective curved surface with an opening toward the light incident surface of the light guide plate.

[0023] In a second aspect, a display device is provided, comprising a display module and a backlight module as described in any of the above technical solutions, wherein the display module is located on the light emitting side of the light guide plate.

[0024] The display device has the same advantages as the above-mentioned backlight module over the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 A diagram of the light transmission path of the structure shown;

[0027] Figure 3 express Figure 1 a front view of the optical device 40;

[0028] Figure 4 express Figure 1 a side view of the optical device 40;

[0029] Figure 5 express Figure 1 A schematic diagram of the distribution of microstructures 401 on the first reflective surface S1;

[0030] Figure 6 express Figure 5 Schematic diagram of the morphology of the mesostructure 401;

[0031] Figure 7 express Figure 6 A variation of the morphology shown;

[0032] Figure 8 express Figure 6 Another variation of the morphology shown. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] refer to Figure 1 and Figure 2The backlight module provided in the embodiment of the present application includes: a light guide plate 62, a light source 32, and a light path folding component 50. The light source 32 is located on the side of the light guide plate 62 away from the light emitting surface. The light path folding component 50 is located on the light incident side of the light guide plate 62 and is used to reflect the light from the light source 32 to the light incident surface of the light guide plate 62. The light source 32 can specifically be an LED (Light-Emitting Diode) light bar or other light sources. The light guide plate 62 can be a conventional light guide plate, and a dot structure is distributed on the surface away from the light emitting surface, and a Lenti microstructure can be added to the light emitting surface.

[0035] In the above-mentioned backlight module, since the light source 32 is located on the side of the light guide plate 62 away from the light emitting surface, it does not occupy the space on the side of the light guide plate 62. Therefore, there is no need for a frame to block the light source 32 on the side of the light guide plate 62, and the width of the frame on the side where the light source 32 is located can be reduced; the light from the light source 32 (reference Figure 2 The solid arrow in the figure) is reflected to the light incident surface of the light guide plate 62, so that the light emitted by the light source 32 can be guided into the light guide plate 62 to provide backlight.

[0036] In a specific embodiment, the optical path folding component 50 has a first reflection surface S1 and a second reflection surface S2 set at an angle, and the opening formed by the first reflection surface S1 and the second reflection surface S2 faces the light incident surface of the light guide plate 62; the light from the light source 32 passes through the first reflection surface S1 and the second reflection surface S2 to enter the light incident surface of the light guide plate 62. Specifically, the light emitted by the light source 32 first passes through the first reflection surface S1, is reflected by the first reflection surface S1 for the first time, and completes a folding. Then, the above-mentioned angle ensures that the light reflected by the first reflection surface S1 can reach the second reflection surface S2, and the second reflection surface S2 reflects the light into the light incident surface of the side of the light guide plate 62. Therefore, the folding of the optical path is achieved only through the two reflection surfaces of the first reflection surface S1 and the second reflection surface S2, which makes the optical path simple, reduces light loss, and has efficient transmission. However, it should be understood that the light can also pass through the second reflection surface S2 first, and then pass through the first reflection surface S1 to enter the light incident surface of the light guide plate 62.

[0037] Specifically, along a direction parallel to the light emitting surface of the light guide plate 62, the light source 32 and the first reflective surface S1 are substantially at the same height, and the light incident surface of the light guide plate 62 and the second reflective surface S2 are substantially at the same height, so as to facilitate the above-mentioned transmission path of the light.

[0038] In a more specific embodiment, the first reflection surface S1 and the second reflection surface S2 may be mirrored with respect to a reference surface K parallel to the light emitting surface of the light guide plate 62. For example, the first reflection surface S1 and the second reflection surface S2 may respectively form an angle of 45° with the reference surface K. In addition, the end of the first reflection surface S1 away from the second reflection surface S2 may be flush with the light emitting surface of the light guide plate 62, so as to fully realize spatial multiplexing with the light guide plate 62 in the thickness direction, avoid occupying additional space in the thickness direction of the light guide plate 62, and facilitate achieving a narrow frame while achieving lightness and thinness.

[0039] In a specific embodiment, the angle α between the first reflective surface S1 and the second reflective surface S2 is greater than zero and less than or equal to 90°, and the angle α can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc. If the angle is too large, it may make it difficult for the light from the light source 32 to pass through the first reflective surface S1 and the second reflective surface S2 and enter the light incident surface of the light guide plate 62.

[0040] The light path folding component 50 may have a variety of specific forms. In a specific embodiment, the light path folding component 50 includes a first sheet-like reflective structure 51 and a second sheet-like reflective structure 52 with an included angle of α; the surface of the first sheet-like reflective structure 51 close to the second sheet-like reflective structure 52 forms a first reflective surface S1, and the surface of the second sheet-like reflective structure 52 close to the first sheet-like reflective structure 51 forms a second reflective surface S2. Since both the first sheet-like reflective structure 51 and the second sheet-like reflective structure 52 are sheet-like structures, they occupy less space, which is conducive to improving the compactness of the backlight module.

[0041] In a specific embodiment, the first sheet-like reflective structure 51 and the second sheet-like reflective structure 52 are both flexible reflective structures, and the backlight module also includes a support frame 30, and the flexible reflective structure is attached to the support frame 30, wherein the support frame 30 can be a structure with sufficient supporting strength such as a rubber frame. The flexible reflective structure is attached to the support frame 30, and the support frame 30 is used to support the flexible reflective structure to form a flat reflective surface. A V-shaped groove can be opened on the surface of the support frame 30 facing the light guide plate 62, and a reflective sheet or a reflective rubber strip is attached to the two inner wall surfaces of the V-shaped groove. The folded light path is located in the V-shaped groove of the support frame 30, and does not occupy additional space.

[0042] The flexible reflective structure may include a reflective sheet or a reflective adhesive strip, and the reflective sheet or the reflective adhesive strip may be a semi-transparent and semi-reflective structure, as long as the above-mentioned reflection can be achieved.

[0043] In a specific embodiment, the backlight module further includes an optical device 40, referring to Figure 3 and Figure 4The optical device 40 has a first surface P1, a second surface P2 and a third surface P3, a first reflective surface S1 is attached to the first surface P1, a second reflective surface S2 is attached to the second surface P2, and the light incident surface of the light guide plate 62 and the light exit surface of the light source 32 are both attached to the third surface P3. On the one hand, the optical device 40 can keep the relative positions of the light guide plate 62, the light source 32, the first sheet-like reflective structure 51 and the second sheet-like reflective structure 52 fixed, ensure that the light is transmitted along a preset path, and prevent a large error in the relative position during the falling process, which affects the utilization rate of the backlight. Among them, the material of the optical device 40 can be one or more of polycarbonate, polymethyl methacrylate and polystyrene. These materials not only have high transparency and can reduce light loss, but also have sufficient supporting strength and are not easy to break when falling.

[0044] During assembly, the optical device 40 may be wedge-shaped, and the first sheet-shaped reflective structure 51 and the second sheet-shaped reflective structure 52 may be fixed one-to-one to the first surface P1 and the second surface P2 of the optical device 40, and then the optical device 40 with the flexible reflective structure may be assembled to the V-shaped groove of the support frame 30, so that the first reflective surface S1 is attached to the first surface P1, and the second reflective surface S2 is attached to the second surface P2. This ensures that during the assembly of the flexible reflective structure and the support frame 30, the first sheet-shaped reflective structure 51 and the second sheet-shaped reflective structure 52 can both maintain their relative positions with the optical device 40, so that the first reflective surface S1 and the second reflective surface S2 can reflect light along a preset trajectory to the light incident surface of the light guide plate 62.

[0045] In a specific embodiment, the backlight module also includes a back panel 10 and a flexible circuit board 20, and the support frame 30 is fixed to the back panel 10. The back panel 10 can specifically be an integrated structure of glue and iron, and can include a base plate 11 and a surrounding panel 12 arranged along the edge of the base plate 11 to enclose a accommodating space. The edge of the surrounding panel 12 away from the base plate 11 is provided with a clamping portion 13 located in the accommodating space. The support frame 30 is arranged in close contact with the surrounding panel 12 and is clamped with the clamping portion 13. Specifically, the support frame 30 can be provided with a clamping slot, and the clamping portion 13 is clamped in the above-mentioned clamping slot to ensure the installation accuracy of the support frame 30 relative to the back panel 10, while ensuring the stability of the back panel 10.

[0046] The flexible circuit board 20 is attached to the back plate 10, specifically, it can be attached to the bottom plate 11 by double-sided tape, etc. The light source 32 can be welded to the flexible circuit board 20, for example, fixedly connected to the flexible circuit board 20 by solder 32 to achieve electrical connection, the power supply supplies power to the light source 32 through the flexible circuit board 20, the controller communicates with the light source 32 through the flexible circuit board 20, and the end of the second sheet-like reflective structure 52 away from the first sheet-like reflective structure 51 can directly abut against the flexible circuit board 20. The support frame 30 can also directly abut against the flexible circuit board 20 to fix the flexible circuit board 20.

[0047] The height of the support frame 30 can be higher than the enclosure 12, and is roughly flush with the light-emitting surface of the light guide plate 62. The surface of the support frame 30 away from the bottom plate 11 is affixed with a light-shielding adhesive 65. The surface of the light guide plate 62 facing the light source 32 is provided with a reflective sheet 61, and the light-emitting surface of the light guide plate 62 is provided with a diffuser 63 and a prism 64 in sequence. The prism 64 can be a single prism or a composite prism, specifically a composite prism, or two layers of single prisms stacked together. The light-shielding adhesive 65 can ensure the stability of optical films such as the diffuser 63 and the prism 64. In addition, the shape of the light-shielding adhesive 65 can be set to a "mouth" shape to block light leakage at the edge while ensuring the required backlight visible area.

[0048] The optical films such as the reflective sheet 61 , the diffuser 63 and the prism 64 and the light guide plate 62 are installed in the accommodation space of the back plate 10 by stacking. The functions of these optical films are the same as the conventional technical solutions in the field and will not be repeated here.

[0049] In a specific embodiment, along the thickness direction of the light guide plate 62, one end of the optical device 40 abuts against the flexible circuit board 20, and the other end is flush with the light emitting surface of the light guide plate 62, so as to fully realize spatial multiplexing with the light guide plate 62 in the thickness direction of the light guide plate 62, improve space utilization, and facilitate the thinning of the backlight module.

[0050] refer to Figure 2 The light emitted by the light source 32 is divided into two types. One is a solid line path. After being reflected by the first reflection surface S1 and the second reflection surface S2, the light can successfully enter the light incident surface of the light guide plate 62. The other is a dotted line path. After being reflected by the second reflection surface S2 and the first reflection surface S1, the light cannot enter the light guide plate 62. Especially when the LED light bar selected by the light source 32 is a Lambertian light source, the above problem is likely to occur, resulting in light loss.

[0051] In order to reduce the above light loss, in a specific embodiment, the first surface P1 and the second surface P2 are both provided with a microstructure 401 for reflecting the light from the light source 32 to the light incident surface of the light guide plate 62. For details, please refer to Figure 5The microstructure 401 on the first reflective surface S1 in the backlight is designed in advance to break the original reflected light path, increase the amount of light entering the light guide plate 62, reduce light efficiency loss, and improve backlight utilization. Specifically, the microstructure 401 can be a convex point structure or a concave point structure, as long as the surface can be used to reflect light to the correct direction. The shape of the microstructure 401 is hemispherical ( Figure 6 ), semi-cylindrical ( Figure 7 ) or wedge-shaped ( Figure 8 ).

[0052] In a specific embodiment, the first sheet-like reflective structure 51 and the second sheet-like reflective structure 52 may be both rigid reflective lenses in addition to being flexible reflective structures. The rigid reflective lenses may provide support by using their own structural strength.

[0053] In addition, in addition to adopting the first sheet-like reflective structure 51 and the second sheet-like reflective structure 52, the optical path folding component 50 can also include a prism, one inner surface of the prism forms a first reflective surface S1, and the other inner surface forms a second reflective surface S2. Light enters from the third surface of the prism and is reflected by the first reflective surface S1 and the second reflective surface S2 respectively. For example, the structure of the optical device 40 can be used as the above-mentioned prism.

[0054] In a specific embodiment, the light path folding component 50 has a concave reflective curved surface with an opening toward the light incident surface of the light guide plate 62 , and can also reflect the light from the light source 32 to the light incident surface of the light guide plate 62 .

[0055] In addition, in the backlight module, the light guide plate, film material, back plate and rubber frame are used in smaller quantities, and no additional process design is required, which can effectively reduce costs.

[0056] Based on the same inventive concept, the display device provided in the embodiment of the present application includes a display module and the backlight module provided in the above embodiment, and the display module is located on the light emitting side of the light guide plate 62. The beneficial effects of the display device can refer to the above analysis of the related effects of the backlight module.

[0057] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A backlight module, characterized in that: include: A light guide plate, a light source, and a light path folding component, wherein the light source is located on the side of the light guide plate away from the light emitting surface, and the light path folding component is located on the light incident side of the light guide plate and is used to reflect light from the light source to the light incident surface of the light guide plate.

2. The backlight module according to claim 1, characterized in that: The optical path folding component comprises a first reflecting surface and a second reflecting surface arranged at an angle, and an opening formed by the first reflecting surface and the second reflecting surface faces the light incident surface of the light guide plate; The light from the light source is reflected by the first reflecting surface and the second reflecting surface in sequence to the light incident surface of the light guide plate.

3. The backlight module according to claim 2, characterized in that: An included angle α between the first reflecting surface and the second reflecting surface is greater than zero and less than or equal to 90°.

4. The backlight module according to claim 2 or 3, characterized in that: The optical path folding assembly comprises a first sheet-shaped reflective structure and a second sheet-shaped reflective structure with an included angle of α; The surface of the first sheet-like reflective structure close to the second sheet-like reflective structure forms the first reflective surface, and the surface of the second sheet-like reflective structure close to the first sheet-like reflective structure forms the second reflective surface.

5. The backlight module according to claim 4, characterized in that: The first sheet-like reflective structure and the second sheet-like reflective structure are both flexible reflective structures. The backlight module further includes a supporting frame, and the flexible reflective structure is attached to the supporting frame.

6. The backlight module according to claim 5, characterized in that: The backlight module also includes an optical device, which has a first surface, a second surface and a third surface. The first reflective surface is attached to the first surface, the second reflective surface is attached to the second surface, and the light incident surface of the light guide plate and the light emitting surface of the light source are both attached to the third surface.

7. The backlight module according to claim 6, characterized in that: The backlight module further comprises a back plate and a flexible circuit board. The support frame is fixed to the back plate. The flexible circuit board is attached to the back plate. The light source is welded to the flexible circuit board.

8. The backlight module according to claim 7, characterized in that: Along the thickness direction of the light guide plate, one end of the optical device abuts against the flexible circuit board, and the other end is flush with the light emitting surface of the light guide plate.

9. The backlight module according to claim 6, characterized in that: The first surface and the second surface are both provided with microstructures for reflecting light from the light source to the light incident surface of the light guide plate.

10. A display device, characterized in that: It comprises a display module and the backlight module according to any one of claims 1 to 9, wherein the display module is located on the light emitting side of the light guide plate.

Images