CN221175200U - Backlight module and display device - Google Patents

Abstract

A backlight module comprises a back plate, a light guide plate, a middle frame element and a buffer element. The backboard is provided with a bearing surface, and the bearing surface bears the light guide plate; the middle frame element is provided with a first part and a second part which are connected, wherein the first part is parallel to the bearing surface, the second part extends from the side edge of the first part towards the back plate, a containing space is formed between the middle frame element and the back plate, the light guide plate is positioned in the containing space and provided with a side wall, and the side wall faces the second part; the buffer element is arranged between the second part and the side wall, and the buffer element contacts the second part and the side wall. A display device is also provided, which can respond to the current trend of narrow frames.

Description

Backlight module and display device

Technical Field

The present utility model relates to a light emitting module and an electronic device, and more particularly, to a backlight module and a display device.

Background

In order to meet the assembly requirement, a buffer structure is usually disposed around the backlight module to fix the light guide plate while performing reliability test (high temperature/low temperature/cold/hot impact/vibration), and maintain the design gap between the light source assembly and the light guide plate consistent, so as to maintain the brightness of the backlight module at a stable value.

The buffer structure must be fixed on the metal back plate of the backlight module, so that huge impact force applied to the buffer structure due to high-temperature expansion or vibration of the light guide plate can be born through the firm metal back plate; once the metal back plate has no hemming structure, the buffer structure cannot be fixed. Furthermore, the assembly sequence of the backlight module is usually to fix the buffer structure to the back plate, and then assemble the light guide plate, if the assembly sequence is opposite, the assembly difficulty is increased.

The background section is only for the purpose of aiding in the understanding of the present utility model and thus the disclosure of this application may include some of the known art that does not constitute a part of this application. Furthermore, the disclosure in the background is not presented to indicate the problem or problems to be solved by one or more embodiments of the utility model, nor is it presented to be known or appreciated by those of ordinary skill in the art prior to the application of the utility model.

Disclosure of utility model

The utility model provides a backlight module and a display device, which can respond to the trend of the current narrow frame, and the backlight module has larger elasticity in assembly.

Other objects and advantages of the present utility model will be further appreciated from the technical features disclosed in the present utility model.

In order to achieve one or a part or all of the above or other objects, the backlight module provided by the present utility model comprises a back plate, a light guide plate, a middle frame element and a buffer element. The backboard is provided with a bearing surface, and the bearing surface bears the light guide plate; the middle frame element is provided with a first part and a second part which are connected, wherein the first part is parallel to the bearing surface, the second part extends from the side edge of the first part towards the back plate, a containing space is formed between the middle frame element and the back plate, the light guide plate is positioned in the containing space and provided with a side wall, and the side wall faces the second part; the buffer element is arranged between the second part and the side wall, and the buffer element contacts the second part and the side wall.

The display device provided by the utility model comprises the backlight module and the display panel, wherein the display panel is arranged at one side of the first part of the middle frame element of the backlight module, which is away from the light guide plate.

In an embodiment of the utility model, the buffer element includes a fixing portion and an oblique angle structure, the fixing portion is disposed on the second portion, the fixing portion has an edge adjacent to the back plate, and the oblique angle structure extends obliquely from the edge of the fixing portion toward the first portion to have a guiding slope, and the guiding slope contacts a sidewall of the light guide plate.

In an embodiment of the utility model, the fixing portion includes a first side and a second side opposite to each other, the first side faces the side wall of the light guide plate, the second side faces the second portion of the middle frame element, and an included angle is formed between the bevel structure and the first side, and the included angle is smaller than 90 degrees.

In an embodiment of the utility model, the buffer element further includes an adhesive disposed on the second side, and the fixing portion is fixed to the second portion via the adhesive.

In an embodiment of the utility model, the second portion is formed with a fastening hole, the buffer element further includes a fastening protrusion, the fastening protrusion of the buffer element is disposed on the second side of the fixing portion, and the fixing portion is fixed to the second portion through combination of the fastening protrusion and the fastening hole.

In an embodiment of the utility model, the middle frame element further includes an elastic clamping piece, the elastic clamping piece is disposed on a side of the second portion facing the light guide plate, a positioning groove is formed on the second side, and the fixing portion is fixed to the second portion through combination of the elastic clamping piece and the positioning groove.

In an embodiment of the utility model, a groove is formed on the guiding slope.

In an embodiment of the utility model, the light guide plate has a corner structure, the corner structure is disposed on a side of the light guide plate away from the bearing surface, and the corner structure is adjacent to a sidewall of the light guide plate.

In an embodiment of the utility model, the backlight module further includes an optical film set disposed at a side of the light guide plate away from the back plate and located in the accommodating space.

In an embodiment of the utility model, a material of the buffer element is rubber.

The buffer element is arranged on the middle frame element, so that the backlight module can use the backboard with the design without the folded edge so as to respond to the trend of the narrow frame of the backlight module at present. The buffer element has an oblique angle structure, so that the middle frame element can be assembled vertically and directly relative to the back plate and the light guide plate thereon, and has larger elasticity in assembly, and interference assembly phenomenon with the light guide plate is avoided.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of the utility model, as illustrated in the accompanying drawings.

Drawings

Fig. 1 is a schematic cross-sectional view of a portion of a display device according to an embodiment of the utility model.

Fig. 2 is a schematic top view illustrating an arrangement of a light guide plate, a light source assembly and a buffer element according to an embodiment of the utility model.

Fig. 3A to 3C are schematic views illustrating assembly operations of frame elements according to an embodiment of the utility model.

Fig. 4 is an assembled schematic view of frame elements in a further embodiment of the utility model.

FIG. 5A is a schematic diagram of a buffer element and a middle frame element according to an embodiment of the present utility model.

FIG. 5B is a schematic cross-sectional view of the cushioning element of FIG. 5A assembled with a center frame element.

FIG. 6A is a schematic diagram of a buffer element and a middle frame element according to another embodiment of the present utility model.

FIG. 6B is a schematic cross-sectional view of the cushioning element of FIG. 6A assembled with a center frame element.

Fig. 7A and 7B are schematic views illustrating different aspects of a buffer element according to another embodiment of the present utility model.

Reference numerals illustrate:

10 display device

12 Backlight module

14 Display panel

16 Back plate

161 Bearing surface

18. 18A light guide plate

181 Side wall

182 Light incident side

183 Guide angle structure

20. 20A, 20B mid-frame element

201 First part

202 Second part

22. 22A, 22B, 22C, 22D, cushioning element

24 Accommodating space

26 Fixing portion

261 Edge

262 First side

263 Second side surface

28. 28A, 28B bevel angle structure

281 Guide slope

282 Outer edge

Theta is the included angle

30 Adhesive material

32 Light source assembly

34 Edge folding

341 Third side

342 Fourth side

36 Optical film set

38 Reflecting sheet

Reaction force F

40, Clamping hole

42 Clamping bump

44 Elastic clamping piece

46 Positioning groove

48 Groove

50, Cutting.

Detailed Description

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiment, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the utility model.

Fig. 1 is a schematic cross-sectional view of a portion of a display device according to an embodiment of the utility model, and as shown in fig. 1, the display device 10 includes a backlight module 12 and a display panel 14, wherein the display panel 14 is disposed on the backlight module 12. The backlight module 12 includes a back plate 16, a light guide plate 18, a middle frame member 20 and a buffer member 22. The back plate 16 has a bearing surface 161, and the bearing surface 161 bears the light guide plate 18. The middle frame element 20 has a first portion 201 and a second portion 202 connected to each other, wherein the first portion 201 is parallel to the carrying surface 161, and the display panel 14 is disposed on a side of the first portion 201 facing away from the light guide plate 18; the second portion 202 extends from a side edge of the first portion 201 toward the bearing surface 161 of the back plate 16, the second portion 202 is perpendicular to the bearing surface 161, for example, and a receiving space 24 is formed between the middle frame element 20 and the back plate 16, where the light guide plate 18 is located in the receiving space 24 and has a sidewall 181, and the sidewall 181 faces the second portion 202. The cushioning element 22 is disposed between the second portion 202 and the sidewall 181, and the cushioning element 22 contacts the second portion 202 and the sidewall 181.

Specifically, as shown in fig. 1, the buffer element 22 includes a fixing portion 26 and an oblique angle structure 28, the fixing portion 26 is disposed on the second portion 202 of the middle frame element 20, the fixing portion 26 has an edge 261 adjacent to the back plate 16, and the oblique angle structure 28 extends from the edge 261 of the fixing portion 26 obliquely toward the first portion 201 to have a guiding slope 281, and the guiding slope 281 contacts the sidewall 181 of the light guide plate 18. In one embodiment, the fixing portion 26 includes a first side 262 and a second side 263 opposite to each other, the first side 262 faces the side wall 181 of the light guide plate 18, the second side 263 faces the second portion 202 of the middle frame element 20, and the bevel structure 28 forms an angle θ with the first side 262, the angle θ is smaller than 90 degrees, and in one embodiment, the longitudinal section of the buffer element 22 is in a J shape; wherein the guiding slope 281 of the bevel structure 28 only partially contacts the sidewall 181 of the light guide plate 18. In one embodiment, the material of the buffer element 22 is, for example, rubber.

In addition, the backlight module 12 further includes a light source assembly, and fig. 2 is a schematic plan view illustrating an arrangement of the light guide plate, the light source assembly and the buffer element according to an embodiment of the utility model. As shown in fig. 1 and 2, the buffer element 22 and the light source component 32 are disposed on opposite sides of the light guide plate 18, respectively, that is, the light incident side 182 of the light guide plate 18 is opposite to the sidewall 181 contacted by the guiding slope 281 (labeled in fig. 1) of the buffer element 22. In an embodiment, as shown in fig. 1, opposite sides of the back plate 16 are asymmetric, wherein one side of the back plate 16 adjacent to the buffer element 22 has no design of a folded edge, and one side of the back plate 16 adjacent to the light source component 32 has a design of a folded edge 34, the folded edge 34 extends from the bearing surface 161 of the back plate 16 toward the accommodating space 24, the folded edge 34 has a third side 341 and a fourth side 342 opposite to each other, the third side 341 faces the light incident side 182 of the light guide plate 18, and the fourth side 342 faces the second portion 202 of the middle frame element 20, wherein the light source component 32 is disposed on the third side 341.

In one embodiment, as shown in fig. 1, the backlight module 12 may optionally include an optical film set 36 disposed on a side of the light guide plate 18 away from the back plate 16 and located in the accommodating space 24, where the optical film set 36 is used to improve brightness and uniformity of the backlight. The optical film group 36 is, for example, a prism sheet, a diffusion sheet, a brightness enhancement film, or other functional films, to which the present utility model is not limited. In an embodiment, the backlight module 12 may optionally include a reflective sheet 38, where the reflective sheet 38 is disposed between the light guide plate 18 and the supporting surface 161 of the back plate 16, and the reflective sheet 38 is, for example, a silver reflective sheet, a white reflective sheet or other films with high reflectivity, which is not limited thereto.

In the present embodiment, the cross-section of the middle frame member 20 is in an L-shaped (or inverted L-shaped) structure, as shown in fig. 1, but in other embodiments not shown, the cross-section of the middle frame member 20 may be designed to be in a T-shaped structure or a cross-shaped structure, which is not limited thereto. In an embodiment, the buffer element 22 further includes an adhesive 30, for example, a double sided tape, the adhesive 30 is disposed on the second side 263 of the fixing portion 26, and the fixing portion 26 is fixed to the second portion 202 of the middle frame element 20 through the adhesive 30.

Fig. 3A to 3C are schematic views illustrating an assembly operation of the frame member according to an embodiment of the present utility model, wherein the buffer member 22 is fixed to the second portion 202 of the middle frame member 20. As shown in fig. 3A, the middle frame member 20 is assembled from top to bottom toward the back plate 16; as shown in fig. 3B, when the bevel structure 28 of the buffer element 22 contacts the light guide plate 18 on the bearing surface 161 of the back plate 16, the bevel structure 28 gradually deforms along the contact between the guide bevel 281 and the light guide plate 18, so as not to interfere with assembly; the middle frame member 20 and/or the buffer member 22 are assembled in place, as shown in fig. 3C, the compressed and deformed bevel structure 28 abuts against the sidewall 181 of the light guide plate 18, and provides a reaction force F on the light guide plate 18, so that the light guide plate 18 can be maintained at the same position continuously to ensure optical stability. In other words, by virtue of the compressible nature of the bevel structure 28 of the buffer element 22, the thrust generated by thermal expansion of the light guide plate 18 can be absorbed, so as to prevent the light guide plate 18 from arching upwards due to the mutual resistance of the thrust generated by thermal expansion of the light guide plate 18 and the reaction force F of the buffer element 22.

Fig. 4 is an assembled schematic view of a frame element according to another embodiment of the utility model, as shown in fig. 4, the light guide plate 18A is disposed on the carrying surface 161 of the back plate 16, the light guide plate 18A may be extended to form a corner guide structure 183, the corner guide structure 183 is formed on a side of the light guide plate 18A away from the carrying surface 161, and the corner guide structure 183 is adjacent to the sidewall 181 of the light guide plate 18A. The buffer element 22 is disposed on the second portion 202 of the middle frame element 20, and the bevel structure 28 of the buffer element 22 has a guiding bevel 281. When the middle frame member 20 is assembled from top to bottom toward the back plate 16 and the bevel structure 28 of the buffer member 22 contacts the corner guide structure 183 of the light guide plate 18A, the bevel structure 28 gradually deforms along the contact between the guide bevel 281 and the corner guide structure 183, so as not to interfere with the assembly.

In the display device 10 according to the embodiment of the present utility model, the manner of assembling or coupling the cushion member 22 and the middle frame member 20 is not limited to the use of the adhesive 30. Fig. 5A is a schematic structural diagram of a buffer element and a middle frame element according to an embodiment of the present utility model, and fig. 5B is a schematic sectional view of the buffer element and the middle frame element shown in fig. 5A after assembly. As shown in fig. 5A, the middle frame member 20A has a first portion 201 and a second portion 202 connected to each other, and the second portion 202 is formed with the engagement hole 40; the buffer element 22A includes a fixing portion 26, an oblique angle structure 28 and a fastening protrusion 42, wherein the fixing portion 26 includes a first side 262 and a second side 263 opposite to each other, and the fastening protrusion 42 is disposed on the second side 263 of the fixing portion 26, and the fastening protrusion 42 can have elasticity; as shown in fig. 5B, the fixing portion 26 is fixed to the second portion 202 of the middle frame element 20A by combining the fastening protrusion 42 and the fastening hole 40 (indicated in fig. 5A). In an embodiment, the fixing portion 26 and the fastening protrusion 42 of the buffering element 22A may be integrally formed, or may be separate elements.

Fig. 6A is a schematic structural diagram of a buffer element and a middle frame element according to another embodiment of the present utility model, and fig. 6B is a schematic sectional view of the buffer element and the middle frame element shown in fig. 6A after assembly. As shown in fig. 6A, the middle frame member 20B has a first portion 201 and a second portion 202 connected to each other, and an elastic clamping piece 44, where the elastic clamping piece 44 is disposed on a side of the second portion 202 facing the light guide plate 18 (indicated in fig. 1); the buffer element 22B includes a fixing portion 26 and an oblique angle structure 28, the fixing portion 26 includes a first side 262 and a second side 263 opposite to each other, and the second side 263 is formed with a positioning slot 46; by combining the elastic clamping piece 44 and the positioning groove 46, as shown in fig. 6B, the fixing portion 26 is fixed to the second portion 202 of the middle frame element 20B. In one embodiment, the second portion 202 of the middle frame member 20B and the elastic clamping piece 44 may be integrally formed, or may be separate members.

Fig. 7A and 7B are schematic views illustrating different aspects of a buffer element according to another embodiment of the present utility model. As shown in fig. 7A and 7B, the buffer element 22C includes a fixing portion 26 and a bevel structure 28A, the buffer element 22D includes a fixing portion 26 and a bevel structure 28B, and the guiding bevel 281 of the bevel structure 28A/28B is formed with a groove 48, which is exemplified by two grooves in the present embodiment, but not limited thereto. The difference between the buffer member 22C shown in fig. 7A and the buffer member 22D shown in fig. 7B is that the bevel structure 28B of the buffer member 22D is formed with a notch 50, as shown in fig. 7B, a side of the bevel structure 28B away from the fixing portion 26 has an outer edge 282, the notch 50 is formed from the outer edge 282 toward the edge 261 of the fixing portion 26, and two grooves 48 on the guiding bevel 281 are respectively located at two sides of the notch 50. The grooves 48 and the slots 50 may have various shapes, and the grooves 48 formed on the bevel structure 28A or the grooves 48 and the slots 50 formed on the bevel structure 28B may be used to effectively adjust the bevel structures 28A/28B to achieve the desired extrusion deformation direction.

According to the above, in the backlight module of the embodiment of the utility model, the buffer element is disposed on the middle frame element, so that the backlight module can use the backboard with the non-hemming design to respond to the trend of the narrow frame of the current backlight module. The buffer element has an oblique angle structure, so that the middle frame element can be assembled vertically and directly relative to the back plate and the light guide plate thereon, and has larger elasticity in assembly, and interference assembly phenomenon with the light guide plate is avoided. By means of the compressible characteristic of the bevel structure of the buffer element, the thrust generated by thermal expansion of the light guide plate can be absorbed, and the upward arch of the light guide plate caused by the mutual resistance of the thrust and the reaction force of the buffer element is prevented, wherein the bevel structure can be compressed and deformed towards a fixed direction, and the phenomenon that other structures in the backlight module are influenced to influence the picture quality of the display device can be avoided.

However, the foregoing is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims and their equivalents as filed in light of the foregoing disclosure. Furthermore, not all of the objects, advantages, or features of the present disclosure are required to be achieved by any one embodiment or claim of the present disclosure. Furthermore, the abstract and title are provided for the purpose of facilitating patent document retrieval only, and are not intended to limit the scope of the claims. In addition, the terms "first," "second," and the like in the description and in the claims are used for naming the elements (components) or distinguishing between different embodiments or ranges, and are not used for limiting the upper or lower limit of the number of elements.

Claims (11)

1. The backlight module is characterized by comprising a back plate, a light guide plate, a middle frame element and at least one buffer element, wherein:

the backboard is provided with a bearing surface;

The bearing surface bears the light guide plate;

The middle frame element is provided with a first part and a second part which are connected, wherein the first part is parallel to the bearing surface, the second part extends from the side edge of the first part towards the back plate, a containing space is formed between the middle frame element and the back plate, and the light guide plate is positioned in the containing space and provided with a side wall which faces the second part; and

The at least one buffer element is arranged between the second part and the side wall, and the at least one buffer element contacts the second part and the side wall.

2. The backlight module according to claim 1, wherein the at least one buffer member comprises at least one fixing portion and at least one bevel structure, the fixing portion is disposed on the second portion, the fixing portion has an edge adjacent to the back plate, the at least one bevel structure extends obliquely from the edge of the fixing portion toward the first portion to have a guiding bevel, and the guiding bevel contacts the side wall of the light guide plate.

3. The backlight module according to claim 2, wherein the fixing portion comprises a first side and a second side opposite to each other, the first side faces the side wall of the light guide plate, the second side faces the second portion of the middle frame element, and an included angle is formed between the bevel structure and the first side, and the included angle is smaller than 90 degrees.

4. A backlight module according to claim 3, wherein the at least one buffer member further comprises an adhesive material disposed on the second side surface, and the fixing portion is fixed to the second portion via the adhesive material.

5. A backlight module according to claim 3, wherein the second portion is formed with at least one engagement hole, the at least one buffer element further comprises at least one fastening protrusion, the at least one fastening protrusion of the at least one buffer element is disposed on the second side of the fixing portion, and the fixing portion is fixed to the second portion through a combination of the at least one fastening protrusion and the at least one engagement hole.

6. A backlight module according to claim 3, wherein the middle frame member further comprises at least one elastic clamping piece, the at least one elastic clamping piece is disposed on a side of the second portion facing the light guide plate, the second side is formed with at least one positioning groove, and the fixing portion is fixed to the second portion through combination of the at least one elastic clamping piece and the at least one positioning groove.

7. The backlight module according to claim 2, wherein the guide slope is formed with at least one groove.

8. The backlight module according to claim 1, wherein the light guide plate has a corner guide structure disposed on a side of the light guide plate away from the bearing surface, and the corner guide structure is adjacent to the side wall of the light guide plate.

9. The backlight module according to claim 1, further comprising an optical film set disposed on a side of the light guide plate away from the back plate and located in the accommodating space.

10. The backlight module according to claim 1, wherein the at least one buffer member is made of rubber.

11. A display device, comprising a backlight module and a display panel, wherein:

The backlight module comprises a back plate, a light guide plate, a middle frame element and at least one buffer element, wherein:

the backboard is provided with a bearing surface;

The bearing surface bears the light guide plate;

The middle frame element is provided with a first part and a second part which are connected, wherein the first part is parallel to the bearing surface, the second part extends from the side edge of the first part towards the back plate, a containing space is formed between the middle frame element and the back plate, and the light guide plate is positioned in the containing space and provided with a side wall which faces the second part; and

The at least one buffer element is arranged between the second part and the side wall, and the at least one buffer element contacts the second part and the side wall; and

The display panel is arranged on one side of the first part of the middle frame element, which is away from the light guide plate.