Side-in type backlight module and display device

Abstract

The utility model discloses a side-in type backlight module and a display device, the side-in type backlight module comprises a die casting, the die casting is a cavity structure with an upward opening, and a reflector plate and a light guide plate are arranged in the die casting from bottom to top; the light bar comprises an FPC and a plurality of LEDs, the FPC is installed on the inner side wall of the die casting, and the LEDs are arranged on the FPC at intervals and face the light guide plate; the reflector plate and the light guide plate are bonded through glue layers, the glue layers are arranged at intervals and correspond to gaps between every two adjacent LEDs, and the white faces of the glue layers face the light guide plate. According to the backlight module, the adhesive layer is arranged corresponding to the gap between the two adjacent LEDs, and the white surface of the adhesive layer faces the light guide plate, so that light emitted by the LEDs is prevented from being absorbed, and the intensity and the uniformity of the light emitted to the light guide plate can be improved through reflection, so that the light-emitting brightness and the light-emitting effect of the backlight module are ensured, and the service life of the backlight module is prolonged. The display effect of the display device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a side-in type backlight module and a display device. Background Technique

[0002] The backlight module is one of the key components of a display device. The existing backlight modules are divided into side-in type backlight modules and direct-lit backlight modules. LED is a commonly used backlight source for side-in type backlight modules, and the arrangement mode of LEDs affects the display effect and manufacturing cost of the display device.

[0003] The traditional backlight module has a wide border design, that is, the A / P value is greater than 0.5. The double-sided tape located in front of the LED and between the reflective sheet and the light guide plate has little influence on the light output effect of the backlight module. However, due to the current pursuit of narrow borders, the A / P value is less than 0.5, which increases the distance between LEDs. The double-sided tape located in front of the LED will absorb light, forming local shadows, resulting in a large loss of brightness and affecting the light output effect of the backlight module. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides a side-in type backlight module and a display device to ensure the light output brightness and light output effect.

[0005] The technical solution adopted by the utility model to solve its problems is as follows:

[0006] A side-in type backlight module includes:

[0007] A die-cast part, which has a cavity structure with an upward opening. A reflective sheet and a light guide plate are arranged in the die-cast part from bottom to top;

[0008] A light bar, which includes an FPC and a plurality of LEDs. The FPC is installed on the inner side wall of the die-cast part, and the plurality of LEDs are arranged at intervals on the FPC and face the light guide plate;

[0009] The reflective sheet and the light guide plate are bonded through an adhesive layer. A plurality of adhesive layers are arranged at intervals and are arranged corresponding to the gaps between adjacent two LEDs. The white surface of the adhesive layer faces the light guide plate.

[0010] Further, the adhesive layer is rectangular, trapezoidal or semi-circular.

[0011] Further, the trapezoidal adhesive layer gradually widens away from the light bar.

[0012] Further, the arc segment of the semi-circular adhesive layer faces away from the light bar.

[0013] Further, the light incident side of the light guide plate is set as a sawtooth structure corresponding to a plurality of LEDs.

[0014] Further, the FPC is bonded to the inner side wall of the die-cast part by a thermal conductive adhesive.

[0015] Further, a buffer pad is provided between the corner of the light guide plate away from the lamp strip and the inner side wall of the die-cast part, and the buffer pad is set with interference fit.

[0016] Further, an iron middle frame is provided on the upper cover of the die-cast part to form a receiving cavity therebetween, and the iron middle frame is detachably connected to the die-cast part.

[0017] Further, the die-cast part is adhesively connected and / or snap-connected to the iron middle frame.

[0018] The present utility model also provides a display device, including a side-entry backlight module.

[0019] The beneficial effects of the side-entry backlight module and the display device provided by the present utility model are as follows:

[0020] By arranging the adhesive layer corresponding to the gap between adjacent two LEDs, and the white surface of the adhesive layer faces the light guide plate, not only the light emitted by the LEDs is prevented from being absorbed, but also the intensity and uniformity of the light radiated to the light guide plate can be improved through reflection, thereby ensuring the light-emitting brightness and light-emitting effect of the backlight module to improve the display effect of the display device. Description of the Drawings

[0021] Figure 1 is a schematic structural view of the side-entry backlight module of the present utility model;

[0022] Figure 2 is a cross-sectional view of the side-entry backlight module of the present utility model;

[0023] Figure 3 is Figure 2 the enlarged view at A in

[0024] Figure 4 is a schematic structural view of one structure of the side-entry backlight module of the present utility model;

[0025] Figure 5 is a partial view of the side-entry backlight module of the present utility model.

[0026] Among them, the meanings of the reference numerals are as follows:

[0027] 1. Die-cast part; 11. Bottom plate; 12. Side plate; 13. Receiving groove; 2. Lamp strip; 21. FPC; 22. LED; 3. Reflector; 31. Bottom reflector; 32. Side reflector; 4. Light guide plate; 5. Adhesive layer; 6. Thermal conductive adhesive; 7. Buffer pad; ⑧. Iron middle frame; 81. Flanging; 9. Double-sided adhesive. Detailed Embodiments

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

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0031] Referring to Figure 2 , Figure 3 and Figure 4 , the present utility model provides a side-entry backlight module, which includes a die-cast part 1 and a light bar 2. Among them, the die-cast part 1 is a cavity structure with an upward opening. A reflector 3 and a light guide plate 4 are arranged in the die-cast part 1 from bottom to top. The light bar 2 includes an FPC 21 and a plurality of LEDs 22. The FPC 21 is installed on the inner side wall of the die-cast part 1, and the plurality of LEDs 22 are arranged at intervals on the FPC 21 and face the light guide plate 4. The reflector 3 and the light guide plate 4 are bonded through an adhesive layer 5. A plurality of adhesive layers 5 are arranged at intervals and are arranged corresponding to the gaps between adjacent two LEDs 22. The white surface of the adhesive layer 5 faces the light guide plate 4.

[0032] Specifically, the die-cast part 1 includes a bottom plate 11 and side plates 12. The side plates 12 surround the circumferential edge of the bottom plate 11, and the side plates 12 and the bottom plate 11 are of an integral structure, thereby forming a cavity structure with an upward opening. The reflector 3 and the light guide plate 4 are arranged in the cavity. The reflector 3 is bonded to the bottom plate 11 through a double-sided adhesive 9 so that the reflector 3 can be stably placed in the cavity of the die-cast part 1. The light guide plate 4 is stacked on the reflector 3, and the light guide plate 4 and the reflector 3 are bonded through the adhesive layer 5 to realize the stable placement of the light guide plate 4 on the reflector 3.

[0033] On this basis, the FPC21 is adhered to the inner side wall of the die-casting part 1 through the heat-conducting adhesive 6. That is, the FPC21 is adhered to the inner wall of the side plate 12 through the heat-conducting adhesive 6. A number of LEDs 22 are installed on the FPC21 at equal intervals along the length direction of the FPC21 and face the light-incident side of the light guide plate 4, and the distance between the light guide plate 4 and the number of LEDs 22 is set. In this way, the light emitted by the number of LEDs 22 is directly incident on the light guide plate 4 or reflected to the light guide plate 4 through the reflector 3.

[0034] Due to the pursuit of narrow borders, the distance between two adjacent LEDs 22 is relatively large. If the adhesive layer 5 is a continuous structure, it will absorb light at the position corresponding to the LED 22, reducing the brightness and forming a shadow, which affects the light-emitting brightness and light-emitting effect of the backlight module. Therefore, in the present utility model, the adhesive layer 5 is designed as a number of spaced-apart ones along the length direction of the FPC21, and the adhesive layer 5 is arranged in a dislocation manner with the LED 22, so that the light emitted by the LED 22 will not be absorbed by the adhesive layer 5. And the white surface of the adhesive layer 5 faces the light guide plate 4. When the light emitted by the LED 22 spreads to the adhesive layer 5, the light can be reflected by the adhesive layer 5 back to the light guide plate 4, thereby improving the intensity and uniformity of the light at the light guide plate 4.

[0035] Thus, in the present utility model, by arranging the adhesive layer 5 corresponding to the gap between two adjacent LEDs 22 and the white surface of the adhesive layer 5 facing the light guide plate 4, not only is the light emitted by the LED 22 prevented from being absorbed, but also the intensity and uniformity of the light incident on the light guide plate 4 can be improved through reflection, thereby ensuring the light-emitting brightness and light-emitting effect of the backlight module.

[0036] Specifically, referring to Figure 4 , the adhesive layer 5 is rectangular, trapezoidal or semi-circular. When the adhesive layer 5 is rectangular, the side part of the adhesive layer 5 can reflect the light to the light guide plate 4. In order to improve the reflection effect, the length of the side part of the adhesive layer 5 is relatively long.

[0037] When the adhesive layer 5 is trapezoidal, the trapezoidal adhesive layer 5 gradually widens away from the lamp strip 2. That is, the length of the side of the adhesive layer 5 close to the FPC21 is less than the length of the side away from the FPC21. In this way, when the light emitted by the LED 22 shines on the adhesive layer 5, the reflection direction of the side part of the adhesive layer 5 to the light is towards the light guide plate 4, which is beneficial to improving the light-emitting intensity and light-emitting effect.

[0038] When the adhesive layer 5 is semi-circular, the arc segment of the semi-circular adhesive layer 5 faces away from the lamp strip 2. That is, the straight segment of the adhesive layer 5 faces the FPC21, and the arc segment of the adhesive layer 5 faces away from the FPC21. In this way, when the light emitted by the LED 22 shines on the adhesive layer 5, the reflection direction of the side part of the adhesive layer 5 to the light is towards the light guide plate 4, which is beneficial to improving the light-emitting intensity and light-emitting effect.

[0039] Furthermore, the light-incident side of the light guide plate 4 corresponding to several LEDs 22 is provided with a sawtooth structure. The design of the sawtooth structure can scatter the light emitted by the LEDs 22, improving the uniformity of the light output of the light guide plate 4. It should be noted that the sawtooth structure is a smooth structure to avoid damaging the components of the backlight module.

[0040] Moreover, in order to further improve the light output effect of the backlight module, the reflector 3 includes a bottom reflector 31 and a side reflector 32. The bottom reflector 31 is adhered to the bottom plate 11 by double-sided tape 9. The side reflector 32 is an integral structure with the bottom reflector 31, and the side reflector 32 is arranged corresponding to the inner wall of the side plate 12 and covers the side part of the light guide plate 4.

[0041] The side plate 12 includes a first side plate and a second side plate. The first side plate and the second side plate are adjacently arranged to surround the circumferential edge of the bottom plate 11. The light bar 2 is arranged on the first side plate, and the side reflector 32 is arranged on the second side plate. In this way, the cooperation of the bottom reflector 31 and the side reflector 32 can further improve the uniformity of light output.

[0042] In addition, referring to Figure 5 , a buffer pad 7 is provided between the corner of the light guide plate 4 far from the light bar 2 and the inner side wall of the die-casting 1, and the buffer pad 7 is set with interference fit. The setting of the buffer pad 7 can prevent the light guide plate 4 from being damaged due to collision.

[0043] An optical film is stacked on the light guide plate 4. The optical film includes a diffusion film, a brightness enhancement film and a brightening film arranged in sequence from bottom to top. The optical films and between the optical films and the light guide plate 4 are adhered and fixed by double-sided tape 9. In this way, the cooperation of the reflector 3, the light guide plate 4 and the optical film further enhances the light output effect of the backlight module.

[0044] On this basis, an iron middle frame 8 is covered on the die-casting 1 to form a receiving cavity therebetween. The iron middle frame 8 is detachably connected to the die-casting 1. The light reflector 3, the light guide plate 4 and the optical film are arranged in the receiving cavity from bottom to top, and the top surface of the optical film abuts against the iron middle frame 8 to ensure the stability of the installation of the optical film.

[0045] Specifically, the die-casting 1 is adhesively connected and / or snap-connected to the iron middle frame 8. Referring to Figure 1 and Figure 4 , a receiving groove 13 is formed at the top of the die-casting 1. The iron middle frame 8 is provided with a flanging 81 corresponding to the receiving groove 13. The flanging 81 is adhesively connected to the receiving groove 13 by double-sided tape 9, and / or the flanging 81 is snap-fitted in the receiving groove 31. And, the part of the iron middle frame 8 without the flanging 81 abuts against the inner side wall of the die-casting 1. In this way, the stability and tightness of the connection between the die-casting 1 and the iron middle frame 8 can be ensured to avoid light leakage.

[0046] In addition to the above side - entry type backlight module, the present utility model further provides a display device, which includes a display module and the above side - entry type backlight module, and the display module is disposed opposite to the light - emitting surface of the side - entry type backlight module.

[0047] Since the adhesive layer 5 is disposed corresponding to the gap between two adjacent LEDs 22, and the white surface of the adhesive layer 5 faces the light guide plate 4, it not only avoids the absorption of the light emitted by the LEDs 22, but also can improve the intensity and uniformity of the light irradiating the light guide plate 4 through reflection, thereby ensuring the light - emitting brightness and light - emitting effect of the backlight module to improve the display effect of the display device.

[0048] The technical means disclosed in the solution of the present utility model are not limited to the technical means 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 for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A side-entry backlight module, characterized in that Comprising: A die-cast part (1), the die-cast part (1) being a cavity structure with an upward opening, and a reflector (3) and a light guide plate (4) being arranged in the die-cast part (1) from bottom to top; A lamp strip (2), the lamp strip (2) comprising an FPC (21) and a plurality of LEDs (22), the FPC (21) being installed on the inner side wall of the die-cast part (1), and the plurality of LEDs (22) being arranged at intervals on the FPC (21) and facing the light guide plate (4); The reflector (3) and the light guide plate (4) are bonded by an adhesive layer (5), the adhesive layer (5) is provided with a plurality of intervals and corresponds to the gaps between two adjacent LEDs (22), and the white surface of the adhesive layer (5) faces the light guide plate (4).

2. The side-injection backlight module according to claim 1, wherein: The adhesive layer (5) is rectangular, trapezoidal or semi-circular.

3. The side-injection backlight module according to claim 2, wherein: The trapezoidal adhesive layer (5) gradually widens away from the lamp strip (2).

4. The side-entry type backlight module according to claim 2, wherein: The arc segment of the semi-circular adhesive layer (5) faces away from the lamp strip (2).

5. The side-entry type backlight module according to claim 1, wherein: The light-incident side of the light guide plate (4) corresponding to the plurality of LEDs (22) is provided with a sawtooth structure.

6. The side-entry type backlight module according to claim 1, wherein: The FPC (21) is bonded to the inner side wall of the die-cast part (1) by a thermal conductive adhesive (6).

7. The side-entry type backlight module according to claim 1, wherein: A buffer pad (7) is provided between the corner of the light guide plate (4) away from the lamp strip (2) and the inner side wall of the die-cast part (1), and the buffer pad (7) is provided with an interference fit.

8. The side-entry backlight module according to claim 1, wherein: The die-cast part (1) is covered with a middle iron frame (8) to form a receiving cavity therebetween, and the middle iron frame (8) is detachably connected to the die-cast part (1).

9. The side-entry backlight module according to claim 8, wherein: The die-cast part (1) is adhesively connected and / or snap-connected to the middle iron frame (8).

10. A display device, characterized in that, Comprising: The side-entry type backlight module according to any one of claims 1-9.

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