Light guide plate mounting structure, backlight module and display device

Abstract

The utility model discloses a light guide plate installation structure, backlight module and display device, the light guide plate installation structure includes: a light guide plate and a light bar that are arranged side by side and extend in the same direction, the light bar is arranged on the side of the light guide plate, the light bar includes a circuit board and a plurality of lamp beads, the plurality of lamp beads are installed on the circuit board at intervals and face the light guide plate; the two ends of the circuit board are bent away from the light guide plate to form bent parts, the light guide plate and the lamp beads are arranged at intervals, the two ends of the side portion of the light guide plate protrude towards the lamp strip to form connecting parts, the connecting parts abut against the circuit board, and part of the connecting parts and the bent parts are arranged at intervals. The two ends of the circuit board are bent away from the light guide plate to form the bent parts, so that only part of the connecting part of the light guide plate abuts against the circuit board, the other part of the connecting part and the bent parts are arranged at intervals, the situation that the light guide plate thermally expands to drive the light bar to move, the lamp beads make contact with the connecting part, and consequently the lamp beads are damaged is avoided, and meanwhile the display uniformity is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, and in particular to a light guide plate installation structure, a backlight module and a display device. Background Art

[0002] The backlight modules of vehicle-mounted LCD devices include edge-type and direct-type. With the rapid development of new energy vehicles, large-size display devices are gradually replacing traditional small-size display devices. Figure 1 As shown, the light bar 10 is mounted on the inner sidewall of the frame 20. The light bar 10 is assembled from two small light bar segments along its extension direction. The light guide plate 30 is installed at a distance from the lamp beads 101 of the light bar 10. To prevent abnormal noises inside the display device during use and to ensure the stability of the light guide plate 30, the light guide plate 30 is installed with an interference fit. That is, the light guide plate 10 and its two ends protrude toward and abut the circuit board 102 of the light bar 10.

[0003] During testing of the aforementioned backlight module, the light guide plate 30 expanded and contracted with heat. When the light guide plate 30 expanded, it squeezed the circuit board 102, causing the light strip 10 to move toward both ends. When the light guide plate 30 contracted, it separated from the circuit board 102, rendering the light strip 10 unable to reposition. This reciprocating movement caused the lamp beads 101 to contact the protrusions of the light guide plate 30, damaging them. Furthermore, the two segments of the light strip moved away from each other, gradually increasing the distance between them and causing uneven display. Utility Model Content

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the present invention provides a light guide plate mounting structure, a backlight module and a display device to prevent the thermal expansion of the light guide plate from causing the light bar to move and damage the lamp beads, while ensuring the uniformity of the display.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A light guide plate mounting structure, comprising: a light guide plate and a light bar arranged side by side and extending in the same direction, wherein the light bar is arranged on the side of the light guide plate, the light bar comprises a circuit board and a plurality of lamp beads, and the plurality of lamp beads are installed on the circuit board at intervals and face the light guide plate;

[0007] The two ends of the circuit board are bent away from the light guide plate to form a bent portion, the light guide plate and the lamp beads are spaced apart, and the two ends of the side of the light guide plate protrude toward the light bar to form a connecting portion, which abuts the circuit board and part of the connecting portion is spaced apart from the bent portion.

[0008] Furthermore, the circuit board includes a main body, a bending portion is arranged at the end of the main body, a portion of the connecting portion abuts the main body, another portion of the connecting portion is spaced apart from the bending portion, and the length of the portion of the connecting portion does not exceed 10% of the total length of the connecting portion.

[0009] Furthermore, the angle at which the bent portion is bent away from the light guide plate does not exceed 10°.

[0010] Furthermore, the light strip includes a first light strip and a second light strip arranged adjacent to each other, the first light strip includes a first circuit board, the second light strip includes a second circuit board, a plurality of lamp beads are installed on the first circuit board and the second circuit board at equal intervals and face the light guide plate, and the ends of the first circuit board and the second circuit board away from each other are bent away from the light guide plate to form a bent portion.

[0011] The utility model also provides a backlight module, which includes a die-casting part and a light guide plate installation structure.

[0012] Furthermore, the die-cast part includes a bottom plate and a side plate. The side plate is arranged at the circumferential edge of the bottom plate, and the side plate and the bottom plate are an integrated structure. The light guide plate is laid flat on the bottom plate, and the light strip is fixed on the inner wall of the side plate. The inner wall of the side plate is adapted to correspond to the circuit board.

[0013] Furthermore, the light strip is bonded to the inner wall of the side panel by double-sided adhesive.

[0014] Furthermore, a reflective film is fixed on the bottom plate, and the light guide plate covers the reflective film.

[0015] Furthermore, the backlight module is also provided with an optical film, and a positioning column is protruded from the edge of the light guide plate. The optical film is provided with a matching ear corresponding to the positioning column, and the ear is set on the positioning column to enable the optical film to cover the light guide plate.

[0016] The utility model also provides a display device, which includes a backlight module.

[0017] The light guide plate installation structure, backlight module and display device provided by the present invention have the following beneficial effects:

[0018] By bending the two ends of the circuit board away from the light guide plate to form a bent portion, the connecting portion of the light guide plate only partially abuts the circuit board, and the other portion is spaced apart from the bent portion to prevent the thermal expansion of the light guide plate from causing the light bar to move and causing the lamp beads to contact the connecting portion and be damaged, while ensuring the uniformity of the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a large-sized edge-lit backlight module in the prior art;

[0020] Figure 2 is a schematic diagram of the light guide plate installation structure of Example 1;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic structural diagram of the backlight module of Example 2;

[0023] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0024] Figure 6 This is an exploded view of the backlight module of Example 2.

[0025] The meanings of the reference numerals are as follows:

[0026] 10. Light bar; 101. Lamp beads; 102. Circuit board; 20. Frame; 30. Light guide plate;

[0027] 1. Light guide plate; 11. Connecting part; 12. Positioning column; 2. Light bar; 21. Circuit board; 211. Bending part; 212. Main body; 22. Lamp beads; 3. Die casting; 31. Bottom plate; 32. Side panel; 4. Double-sided tape; 5. Reflective film. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Example 1

[0032] See Figure 2 and Figure 3This embodiment discloses a light guide plate mounting structure, comprising: a light guide plate 1 and a light bar 2, arranged side by side and extending in the same direction. The light bar 2 is disposed on the side of the light guide plate 1. The light bar 2 includes a circuit board 21 and a plurality of lamp beads 22, which are installed on the circuit board 21 at intervals and face the light guide plate 1. Both ends of the circuit board 21 are bent away from the light guide plate 1 to form bent portions 211. The light guide plate 1 and the lamp beads 22 are spaced apart. Both ends of the side of the light guide plate 1 protrude toward the light bar 2 to form connecting portions 11. The connecting portions 11 abut the circuit board 21, and a portion of the connecting portions 11 is spaced apart from the bent portions 211.

[0033] Specifically, the light guide plate 1 and the light bar 2 both extend lengthwise and are arranged side by side. The side of the light guide plate 1 adjacent to the light bar 2 is a first side portion. The circuit board 21 of the light bar 2 is arranged side by side with the first side portion. A plurality of lamp beads 22 are mounted on the side of the circuit board 21 facing the first side portion at equal intervals, and the lamp beads 22 are spaced apart from the first side portion. The two ends of the first side portion protrude toward the circuit board 21 to form a connecting portion 11. A portion of the connecting portion 11 abuts the circuit board 21, and the other portion is spaced apart from the bent portion 211.

[0034] Therefore, this embodiment bends both ends of the circuit board 21 away from the light guide plate 1 to form a bent portion 211, so that only a portion of the connecting portion 11 of the light guide plate 1 abuts the circuit board 21, while the remaining portion is spaced apart from the bent portion 211. This prevents thermal expansion of the light guide plate 1 from squeezing the circuit board 21, causing movement of the light bar 2 and contact of the lamp beads 22 with the connecting portion 11, thereby preventing damage to the lamp beads 22. Furthermore, the partial abutment of the connecting portion 11 of the light guide plate 1 against the circuit board 21 ensures stable installation of the light guide plate 1 and prevents abnormal noise.

[0035] The light guide plate mounting structure of this embodiment is a large-size structure. The light bar 2 includes a first light bar and a second light bar arranged adjacent to each other. The first light bar includes a first circuit board, and the second light bar includes a second circuit board. A number of lamp beads 22 are installed on the first circuit board and the second circuit board at equal intervals and face the light guide plate 1. The ends of the first circuit board and the second circuit board that are away from each other are bent away from the light guide plate 1 to form a bent portion 211.

[0036] The first and second light strips both extend lengthwise and are adjacently arranged to form the light strip 2 of this embodiment. The end of the first circuit board away from the second circuit board is bent away from the light guide plate 1 to form a bent portion 211. Similarly, the end of the second circuit board away from the first circuit board is bent away from the light guide plate 1 to form a bent portion 211. Thus, bent portions 211 are formed at both ends of the circuit board 21 of this embodiment. When the light guide plate 1 expands thermally, it only slightly squeezes the circuit board 21, thereby preventing the first and second light strips from moving away from each other. This prevents damage to the lamp beads 22 caused by contact with the connecting portion 11, while ensuring uniform distribution of the lamp beads 22.

[0037] Based on the above structure, the circuit board 21 includes a main body 212, with a bent portion 211 disposed at the end of the main body 212. A portion of the connecting portion 11 abuts the main body 212, while another portion of the connecting portion 11 is spaced apart from the bent portion 211. The length of the portion of the connecting portion 11 does not exceed 10% of the total length of the connecting portion 11. On the one hand, the abutment of the connecting portion 11 against the main body 212 ensures the stability of the installation of the light guide plate 1 and prevents abnormal noise. On the other hand, only a small portion of the connecting portion 11 is connected to the main body 212, so that thermal expansion of the light guide plate 1 has little effect on the circuit board 21, thus preventing movement of the light bar 2.

[0038] Furthermore, the angle of the bent portion 211 away from the light guide plate 1 does not exceed 10 degrees. This angle of the bent portion 211 prevents the light strip 2 from being squeezed and moved by thermal expansion of the light guide plate 1, while also preventing the strength of the circuit board 21 from being affected by an excessively large bending angle, while also not excessively increasing the space occupied by the light strip.

[0039] Example 2

[0040] See Figure 4-6 This embodiment discloses a backlight module comprising a die-casting 3 and the light guide plate mounting structure of Example 1. The light guide plate mounting structure of Example 1 is used in the backlight module to prevent thermal expansion of the light guide plate 1 from squeezing the circuit board 21, causing the light bar 2 to move and causing the lamp beads 22 to contact the connecting portion 11. This prevents damage to the lamp beads 22 and ensures uniform light output from the backlight module. Furthermore, the partial abutment of the connecting portion 11 of the light guide plate 1 against the circuit board 21 ensures stable installation of the light guide plate 1 and prevents abnormal noise within the backlight module.

[0041] The die-casting 3 includes a base plate 31 and a side plate 32. The side plate 32 is arranged on the circumferential edge of the base plate 31, and the side plate 32 and the base plate 31 are an integrated structure. The light guide plate 1 is laid flat on the base plate 31, and the light strip 2 is fixed on the inner wall of the side plate 32. The inner wall of the side plate 32 is adapted to correspond to the circuit board 21.

[0042] Specifically, the light guide plate 1 covers the bottom plate 31, and the light guide plate 1 is installed with an interference fit to avoid abnormal noise. The side panels 32 include a first side panel and a second side panel arranged adjacent to each other. The light bar 2 is installed on the inner wall of the first side panel, and the shape of the inner wall of the first side panel matches the shape of the light bar 2. That is, the inner wall of the first side panel is concave at the same angle as the corresponding bent portion 211. This ensures that the circuit board 21 is fixed to the inner wall of the first side panel and avoids increasing the size of the die-casting 3. At the same time, the angle at which the bent portion 211 bends away from the light guide plate 1 does not exceed 10°, and the degree of concavity of the inner wall of the first side panel is small, which does not affect the strength of the first side panel.

[0043] In this embodiment, the light bar 2 is adhered to the inner wall of the side panel 32 by a double-sided adhesive tape 4. The double-sided adhesive tape 4 can improve the flatness of the contact between the circuit board 21 and the side panel 32, thereby improving the lighting effect of the light bar 2.

[0044] Furthermore, a reflective film 5 is fixed to the base plate 31, and the light guide plate 1 covers the reflective film 5. The backlight module also features an optical film. Positioning posts 12 are protruding from the edge of the light guide plate 1. The optical film has corresponding clips that fit over the posts 12, securing the optical film over the light guide plate 1. The optical film includes, from bottom to top, a diffuser film, a lower brightness enhancement film, an upper brightness enhancement film, and a brightness enhancement film. Thus, the reflective film 5, light guide plate 1, and optical film work together to ensure optimal light output from the backlight module.

[0045] Example 3

[0046] This embodiment discloses a display device comprising a display module and the backlight module of Example 2. Because the backlight module prevents thermal expansion of the light guide plate 1 from squeezing the circuit board 21, causing the light bar 2 to move and causing the lamp beads 22 to contact the connecting portion 11, damage to the lamp beads 22 is avoided, ensuring uniform light output from the backlight module and, in turn, display uniformity of the display device, avoiding uneven brightness.

[0047] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A light guide plate installation structure, characterized in that: include: A light guide plate (1) and a light bar (2) are arranged side by side and extend in the same direction, the light bar (2) is arranged on the side of the light guide plate (1), the light bar (2) comprises a circuit board (21) and a plurality of lamp beads (22), the plurality of lamp beads (22) are installed at intervals on the circuit board (21) and face the light guide plate (1); The two ends of the circuit board (21) are bent away from the light guide plate (1) to form a bent portion (211), the light guide plate (1) and the lamp beads (22) are spaced apart, and the two ends of the side portion of the light guide plate (1) protrude toward the light bar (2) to form a connecting portion (11), the connecting portion (11) abuts the circuit board (21), and a portion of the connecting portion (11) is spaced apart from the bent portion (211).

2. The light guide plate installation structure according to claim 1, wherein: The circuit board (21) comprises a main body (212), the bent portion (211) is arranged at the end of the main body (212), a portion of the connecting portion (11) abuts against the main body (212), another portion of the connecting portion (11) is spaced apart from the bent portion (211), and the length of the portion of the connecting portion (11) does not exceed 10% of the total length of the connecting portion (11).

3. The light guide plate installation structure according to claim 1, wherein: The angle at which the bent portion (211) bends away from the light guide plate (1) does not exceed 10°.

4. The light guide plate installation structure according to claim 1, wherein: The light bar (2) comprises a first light bar and a second light bar arranged adjacent to each other, the first light bar comprising a first circuit board, the second light bar comprising a second circuit board, a plurality of the lamp beads (22) being installed at equal intervals on the first circuit board and the second circuit board and facing the light guide plate (1), and the ends of the first circuit board and the second circuit board that are away from each other are bent away from the light guide plate (1) to form the bent portion (211).

5. A backlight module, characterized in that: include: A die-cast part (3) and a light guide plate mounting structure according to any one of claims 1 to 4.

6. The backlight module according to claim 5, wherein: The die-casting (3) includes a bottom plate (31) and a side plate (32), wherein the side plate (32) is arranged at the circumferential edge of the bottom plate (31), and the side plate (32) and the bottom plate (31) are an integrated structure, the light guide plate (1) is laid flat on the bottom plate (31), the light bar (2) is fixed to the inner wall of the side plate (32), and the inner wall of the side plate (32) is adapted to correspond to the circuit board (21).

7. The backlight module according to claim 6, wherein: The light strip (2) is adhered to the inner wall of the side panel (32) by means of double-sided adhesive tape (4).

8. The backlight module according to claim 6, wherein: A reflective film (5) is fixed on the bottom plate (31), and the light guide plate (1) covers the reflective film (5).

9. The backlight module according to claim 6, wherein: The backlight module is further provided with an optical film, a positioning column (12) is protruding from the edge of the light guide plate (1), and the optical film is provided with a matching ear corresponding to the positioning column (12), and the ear is sleeved on the positioning column (12) so that the optical film covers the light guide plate (1).

10. A display device, characterized in that: include: The backlight module according to any one of claims 5 to 9.

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