Backlight module and display device

Abstract

The utility model belongs to the technical field of display, and discloses a backlight module and a display device.The backlight module comprises a back plate, a middle frame and a light bar assembly, the back plate comprises back plate side plates, the back plate side plates define a containing space, receding grooves communicated with the containing space are formed in the back plate side plates, the middle frame comprises middle frame side plates, and the middle frame side plates are connected with the containing space through the middle frame side plates. The middle frame side plate is arranged on the periphery of the back plate side plate in a surrounding mode, the light bar assembly comprises a flexible circuit board and an LED light source arranged on the flexible circuit board, the flexible circuit board is arranged on the middle frame side plate, and the LED light source is contained in the receding groove. The LED light source is inserted into the receding groove, the flexible circuit board is attached to the middle frame, the occupied containing space is reduced, the size of the light guide plate is increased, and therefore the propagation path of light in the light guide plate is prolonged, the light passing angle range is enlarged, the light transmittance is improved, tearing caused by relative dislocation friction between the flexible circuit board and the back plate is avoided, and the service life of the light guide plate is prolonged. The protection of the flexible circuit board is improved, and the service life is prolonged.

Description

Technical Field

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

[0002] The display device consists of a display panel and a backlight module. Since the display panel cannot emit light by itself, it can only display images by relying on the light emitted by the backlight module installed below the display panel. Therefore, the design of the backlight module is particularly important in the display device. The light bar in the backlight module is equipped with multiple light sources to provide light for the display panel. For vehicle-mounted models, the brightness requirement is high.

[0003] The existing vehicle-mounted light bar fixing method is: a connecting long hole is opened on the side wall of the accommodating space of the back panel, the light bar is located on the inner wall of the accommodating space of the back panel, and the flexible circuit board on the light bar is passed through the connecting long hole and fits with the outer wall of the accommodating space, thereby realizing the connection and fixation of the light bar and the back panel.

[0004] However, since the reflective sheet, light guide plate and optical film of the backlight module are also placed in the accommodation space of the back panel, the size of the light guide plate needs to be reduced for easy assembly. However, in narrow-frame models, due to the narrow frame space and the size of the light guide plate, the angle range of light passage is relatively narrow and the light transmittance is poor; in addition, in order to facilitate assembly, the width of the connecting long hole on the side wall of the back panel is usually larger than the width of the flexible circuit board of the light bar, which causes tearing between the flexible circuit board and the side wall of the back panel due to relative displacement, resulting in damage to the light bar, poor protection, and a short service life of the light bar. Utility Model Content

[0005] The utility model aims to provide a backlight module and a display device, which not only have good light transmittance, but also have strong protection performance and long service life.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a backlight module is provided, the backlight module comprising:

[0008] A back panel, the back panel comprising back panel side panels, the back panel side panels are surrounded to form an accommodating space, and the back panel side panels are provided with avoidance grooves communicating with the accommodating space;

[0009] A middle frame, the middle frame comprising middle frame side panels, the middle frame side panels being arranged around the outer periphery of the back panel side panels;

[0010] A light bar assembly, the light bar assembly comprising a flexible circuit board and an LED light source arranged on the flexible circuit board, the flexible circuit board is arranged on the side plate of the middle frame, and the LED light source is accommodated in the avoidance groove.

[0011] Optionally, the avoidance groove is a through hole that penetrates the back panel side plate along the thickness direction of the back panel side plate.

[0012] Optionally, the top of the avoidance groove passes through the top of the back panel side panel.

[0013] Optionally, the LED light source does not protrude from the avoidance groove along the thickness direction of the back panel side panel.

[0014] Optionally, a matching bevel is provided at a corner of the LED light source, and a matching arc surface corresponding to the matching bevel is provided on the inner wall of the avoidance groove.

[0015] Optionally, there are multiple LED light sources, and the multiple LED light sources are arranged on the flexible circuit board at intervals along the length direction of the flexible circuit board, and the back panel is provided with multiple avoidance grooves corresponding to the LED light sources one by one.

[0016] Optionally, the backlight module further includes a light guide plate, and a projection of the light guide plate along the first direction completely covers a projection of the LED light source along the first direction.

[0017] Optionally, the backlight module further includes a light guide plate, and the distance between the upper surface of the light guide plate and the upper surface of the LED light source is equal to the distance between the lower surface of the light guide plate and the lower surface of the LED light source.

[0018] Optionally, the light bar assembly further includes a glue plate, and the flexible circuit board is bonded to the middle frame side plate via the glue plate.

[0019] On the other hand, a display device is further provided, comprising a liquid crystal panel and a backlight module as described in any one of the above items, wherein the liquid crystal panel is arranged on the backlight module.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a backlight module, which provides an avoidance groove on the back panel, accommodates the LED light source of the light bar assembly in the avoidance groove, and attaches the flexible circuit board of the light bar assembly to the middle frame. The light bar assembly does not occupy the accommodating space of the back panel, thereby allowing a larger-sized light guide plate to be placed in the accommodating space, thereby extending the path of light propagation in the light guide plate, expanding the angular range of light passage, and improving light transmittance. In addition, the flexible circuit board is attached to the middle frame, and there is no need to provide a long hole on the back panel for the flexible circuit board to pass through, thereby avoiding tearing caused by relative displacement friction between the flexible circuit board and the back panel, improving the protection of the flexible circuit board, and extending the service life of the light bar assembly.

[0022] The utility model also provides a display device, which has good light transmittance by applying the above-mentioned backlight module, thereby improving product performance, and also improves product quality by applying a light bar component with a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial cross-sectional schematic diagram of the backlight module provided by the utility model;

[0024] Figure 2 It is a side view of a back plate in the backlight module provided by the present invention;

[0025] Figure 3 This is a partial side view of another back plate in the backlight module provided by the present invention.

[0026] In the figure:

[0027] 1. Light guide plate;

[0028] 2. back panel; 21. accommodation space; 22. avoidance groove; 23. back panel bottom plate; 24. back panel side plate;

[0029] 3. Light bar assembly; 31. Flexible circuit board; 32. LED light source; 33. Rubber board;

[0030] 4. middle frame; 41. middle frame bottom plate; 42. middle frame side plate;

[0031] 5. Reflective sheet;

[0032] 6. Optical film;

[0033] 7. LCD panel. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] In order to increase the light transmittance of a narrow-frame device, improve the protection performance of a light bar, and extend the service life of the light bar, this embodiment provides a backlight module.

[0039] Figure 1 shows a partial cross-sectional view of the backlight module provided in this embodiment, Figure 2 A partial side view of a back plate 2 in the backlight module provided in this embodiment is shown. Figure 3 FIG. 2 shows a partial side view of another back plate 2 in the backlight module provided in this embodiment. Figure 1-Figure 3 As shown, the backlight module includes a back panel 2, a light bar assembly 3 and a middle frame 4, the back panel 2 includes a back panel side panel 24, the back panel side panel 24 is surrounded by a accommodating space 21, the back panel side panel 24 is provided with an avoidance groove 22 connected to the accommodating space 21, the middle frame includes a middle frame side panel 42, the middle frame side panel 42 is surrounded by the outer periphery of the back panel side panel 24, the light bar assembly 3 includes a flexible circuit board 31 and an LED light source 32 arranged on the flexible circuit board 31, the flexible circuit board 31 is arranged on the middle frame side panel 42, and the LED light source 32 is accommodated in the avoidance groove 22.

[0040] The backlight module is provided with an avoidance groove 22 on the back plate 2, the LED light source 32 of the light bar assembly 3 is accommodated in the avoidance groove 22, and the flexible circuit board 31 of the light bar assembly 3 is attached to the middle frame 4, so that the light bar assembly 3 does not occupy the accommodating space 21 of the back plate 2, thereby allowing a larger size of the light guide plate 1 to be placed in the accommodating space 21, thereby extending the path of light propagation in the light guide plate 1, expanding the angle range of light passage, and improving light transmittance. In addition, the flexible circuit board 31 is attached to the middle frame 4, and there is no need to open a long hole on the back plate 2 for the flexible circuit board 31 to pass through, thereby avoiding tearing caused by relative displacement friction between the flexible circuit board 31 and the back plate 2, improving the protection of the flexible circuit board 31, and extending the service life of the light bar assembly 3.

[0041] In this embodiment, the backlight module further includes a reflective sheet 5 and an optical film 6 . The reflective sheet 5 is disposed between the light guide plate 1 and the bottom wall of the accommodating space 21 , and the optical film 6 is disposed on a side of the light guide plate 1 away from the reflective sheet 5 .

[0042] Specifically, the back panel 2 includes a back panel bottom plate 23 and a plurality of back panel side plates 24, the plurality of back panel side plates 24 are connected end to end in sequence and are vertically arranged on the periphery of the back panel bottom plate 23, the back panel bottom plate 23 and the plurality of back panel side plates 24 together enclose an accommodation space 21, and the avoidance groove 22 is provided on the back panel side plates 24; the middle frame 4 includes a middle frame bottom plate 41 and a middle frame side plate 42 vertically connected around the middle frame bottom plate 41, so that the longitudinal section of the middle frame 4 is L-shaped, the middle frame bottom plate 41 abuts against the side of the back panel side plate 24 away from the back panel bottom plate 23, the middle frame bottom plate 41 is used to carry the liquid crystal panel 7, the middle frame side plate 42 is located on the side of the back panel side plate 24 away from the accommodation space 21, and is connected to the side of the flexible circuit board 31 away from the LED light source 32. In this embodiment, the middle frame 4 is manufactured in an integrated molding manner, such as an injection molding process.

[0043] Optionally, the avoidance groove 22 is a through hole that penetrates the back panel side plate 24 along the thickness direction of the back panel side plate 24. By drilling a hole, the avoidance groove 22 for accommodating the LED light source 32 is processed on the groove wall of the accommodating space 21, so that the periphery of the LED light source 32 can be protected to prevent the LED light source 32 from being damaged by other components during assembly.

[0044] Optionally, the top of the avoidance groove 22 passes through the top of the back plate side plate 24. By grooving, the avoidance groove 22 for accommodating the LED light source 32 is conveniently processed on the groove wall of the accommodating space 21.

[0045] Optionally, the LED light source 32 does not protrude from the avoidance groove 22 along the thickness direction of the back panel side plate 24. By making the LED light source 32 not protrude from the avoidance groove 22 along the thickness direction of the back panel side plate 24, it is ensured that when the LED light source 32 is inserted into the avoidance groove 22, it will not extend into the accommodating space 21, thereby avoiding contact between the LED light source 32 and the light guide plate 1. In this embodiment, in order to facilitate the insertion of the LED light source 32 into the avoidance groove 22, the width of the avoidance groove 22 is slightly larger than the width of the LED light source 32.

[0046] Optionally, a matching bevel is provided at the corner of the LED light source 32, and a matching arc surface corresponding to the matching bevel is provided on the inner wall of the avoidance groove 22. By providing the matching bevel on the LED light source 32 and the matching arc surface on the avoidance groove 22, when assembling, the combination of the matching bevel and the matching arc surface is utilized to avoid interference between the sharp corner of the LED light source 32 and the corner between the bottom wall and the side wall of the avoidance groove 22, so that the LED light source 32 is closely fitted with each surface of the avoidance groove 22, thereby improving the assembly effect.

[0047] Optionally, there are multiple LED light sources 32, and the multiple LED light sources 32 are arranged on the flexible circuit board 31 at intervals along the length direction of the flexible circuit board 31, and the back plate 2 is provided with multiple avoidance grooves 22 corresponding to the LED light sources 32. By providing avoidance grooves 22 corresponding to the multiple LED light sources 32, more materials can be retained compared to providing avoidance grooves 22 covering all LED light sources 32, thereby ensuring the structural strength of the back plate 2, and the shape of each avoidance groove 22 is adapted to the shape of the corresponding LED light source 32. In this embodiment, the LED light source 32 is a rectangular block, and each avoidance groove 22 is a rectangular groove corresponding thereto.

[0048] Optionally, the backlight module further includes a light guide plate 1, and the projection of the light guide plate 1 along the first direction completely covers the projection of the LED light source 32 along the first direction. By making the projection of the light guide plate 1 along the first direction completely cover the projection of the LED light source 32 along the first direction, it is avoided that the light emitted from the part of the LED light source 32 that is larger than the light guide plate 1 cannot be propagated through the light guide plate 1, resulting in reduced brightness.

[0049] Optionally, the backlight module further includes a light guide plate 1, and the distance between the upper surface of the light guide plate 1 and the upper surface of the LED light source 32 is equal to the distance between the lower surface of the light guide plate 1 and the lower surface of the LED light source 32. Thus, the LED light source 32 is located in the center of the light guide plate 1 in terms of height.

[0050] Optionally, the light bar assembly 3 further includes a glue plate 33, and the flexible circuit board 31 is bonded to the middle frame side plate 42 through the glue plate 33. By providing the glue plate 33, the flexible circuit board 31 and the middle frame 4 are bonded, making the connection between the two very convenient. In this embodiment, the glue plate 33 is made of a heat-conducting structural glue, which is more conducive to heat dissipation and cooling.

[0051] Among them, when assembling the backlight module, the LED light source 32 is first connected to the flexible circuit board 31, and then the glue sheet 33 is attached to the side of the flexible circuit board 31 away from the LED light source 32 to complete the assembly of the light bar assembly 3. Then, according to the size of the space 21 on the back panel 2, the corresponding light guide plate 1 is placed in the accommodating space 21, and before the light guide plate 1 is placed, a reflective sheet 5 is attached to the bottom wall of the accommodating space 21, and an optical film 6 is attached to the side of the light guide plate 1 away from the reflective sheet 5. Then, the assembled light bar assembly 3 is assembled with it, and the LED light source 32 is inserted into the avoidance groove 22 on the back panel side panel 24 of the back panel 2, and then the middle frame bottom plate 41 of the middle frame 4 is overlapped on the side of the back panel side panel 24 away from the back panel bottom plate 23, and the middle frame side panel 42 of the middle frame 4 is bonded to the glue sheet 33 on the flexible circuit board 31, and finally the liquid crystal panel 7 is mounted and fixed on the middle frame bottom plate 41 of the middle frame 4.

[0052] In this embodiment, a display device is also provided, which includes a liquid crystal panel 7 and the above-mentioned backlight module, and the liquid crystal panel 7 is arranged on the backlight module. By applying the above-mentioned backlight module, the display device has a good light transmittance, improves the performance of the product, and by applying the light bar assembly 3 with a longer service life, the quality of the product is also improved.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A backlight module, characterized in that: The backlight module comprises: A back panel (2), the back panel (2) comprising a back panel side panel (24), the back panel side panel (24) being arranged to form a receiving space (21), and a avoidance groove (22) communicating with the receiving space (21) being formed on the back panel side panel (24); A middle frame (4), the middle frame comprising a middle frame side plate (42), the middle frame side plate (42) being arranged around the outer periphery of the back plate side plate (24); A light bar assembly (3), the light bar assembly (3) comprising a flexible circuit board (31) and an LED light source (32) arranged on the flexible circuit board (31), the flexible circuit board (31) being arranged on the middle frame side plate (42), and the LED light source (32) being accommodated in the avoidance groove (22).

2. The backlight module according to claim 1, characterized in that: The avoidance groove (22) is a through hole that penetrates the back plate side plate (24) along the thickness direction of the back plate side plate (24).

3. The backlight module according to claim 1, characterized in that: The top of the avoidance groove (22) passes through the top of the back panel side plate (24).

4. The backlight module according to claim 1, characterized in that: The LED light source (32) does not protrude from the avoidance groove (22) along the thickness direction of the back panel side plate (24).

5. The backlight module according to claim 1, characterized in that: A matching bevel is provided at a corner of the LED light source (32), and a matching arc surface corresponding to the matching bevel is provided on the inner wall of the avoidance groove (22).

6. The backlight module according to claim 1, characterized in that: The number of the LED light sources (32) is multiple, and the multiple LED light sources (32) are arranged on the flexible circuit board (31) at intervals along the length direction of the flexible circuit board (31), and the back plate (2) is provided with multiple avoidance grooves (22) corresponding to the LED light sources (32) one by one.

7. The backlight module according to claim 1, characterized in that: The backlight module further comprises a light guide plate (1), wherein a projection of the light guide plate (1) along a first direction completely covers a projection of the LED light source (32) along the first direction.

8. The backlight module according to claim 1, characterized in that: The backlight module also comprises a light guide plate (1), wherein the distance between the upper surface of the light guide plate (1) and the upper surface of the LED light source (32) is equal to the distance between the lower surface of the light guide plate (1) and the lower surface of the LED light source (32).

9. The backlight module according to any one of claims 1 to 8, characterized in that: The light bar assembly (3) further comprises a glue plate (33), and the flexible circuit board (31) is bonded to the middle frame side plate (42) via the glue plate (33).

10. A display device, characterized in that It comprises a liquid crystal panel (7) and a backlight module as claimed in any one of claims 1 to 9, wherein the liquid crystal panel (7) is arranged on the backlight module.

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