阅读说明：本技术 背光模组 (Backlight module ) 是由 陈炜杰 连志贤 张宇 于 2021-08-20 设计创作，主要内容包括：本发明提供一种背光模组,包含：一底座,具有一第一主体部、一第一弯折部以及一第二弯折部；一反射片,位于所述第一主体部上；一导光板,位于所述反射片上,其中所述导光板具有一第二主体部、一第一卡扣部以及一第二卡扣部；以及一光学叠层,位于所述第二主体部上,并具有超出所述第二主体部的一突出部；其中,所述第一弯折部夹置于所述突出部与所述第一卡扣部之间,而所述第二弯折部夹置于所述突出部与所述第二卡扣部之间。(The invention provides a backlight module, comprising: a base having a first main body portion, a first bending portion and a second bending portion; the reflector plate is positioned on the first main body part; the light guide plate is positioned on the reflector plate and is provided with a second main body part, a first buckling part and a second buckling part; and an optical stack on the second body portion and having a protrusion extending beyond the second body portion; the first bending part is clamped between the protruding part and the first buckling part, and the second bending part is clamped between the protruding part and the second buckling part.)

1. A backlight module, comprising:

the base is provided with a first main body part, a first bending part and a second bending part;

a reflector plate located on the first main body part

The light guide plate is positioned on the reflector plate and is provided with a second main body part, a first buckling part and a second buckling part; and

an optical stack on the second body portion and having a protrusion beyond the second body portion;

the first bending part is clamped between the protruding part and the first buckling part, and the second bending part is clamped between the protruding part and the second buckling part.

2. The backlight module as claimed in claim 1, wherein the first locking portion and the second locking portion are both portions protruding outward from a lower half portion of the second main body portion and located at two ends of a long side of the second main body portion.

3. The backlight module according to claim 1, wherein the first bending portion has a first extending portion, a second extending portion and a third extending portion continuously extending from the first main body portion; the second bending part is provided with a fourth extending part, a fifth extending part and a sixth extending part which continuously extend from the first main body part.

4. The backlight module as claimed in claim 3, wherein the first extension portion and the first main body portion have an acute angle therebetween; an obtuse angle is formed between the first extending part and the second extending part; an obtuse angle is formed between the second extending part and the third extending part; an acute angle is formed between the fourth extending part and the first main body part; an obtuse angle is formed between the fourth extending part and the fifth extending part; an obtuse angle is formed between the fifth extending part and the sixth extending part.

5. The backlight module according to claim 3, wherein the first bending portion and the second bending portion are flexible sheet structures.

6. The backlight module of claim 1, wherein the backlight module has a display area, and the reflective sheet occupies the display area.

7. The backlight module according to claim 6, wherein the backlight module has a non-display area, and the first locking portion, the second locking portion, the first bending portion, the second bending portion, and the protrusion are all located in the non-display area.

8. The backlight module according to claim 1, wherein a surface of the first locking portion contacting the first bending portion and a surface of the second locking portion contacting the second bending portion are rough surfaces.

9. The backlight module of claim 3, wherein the third extension and the sixth extension are formed of a rubber material.

10. The backlight module as claimed in claim 3, wherein the third extension and the sixth extension both form a tapered portion at ends thereof.

Technical Field

The present invention relates to a backlight module, and more particularly, to a backlight module with improved assembly accuracy of a light guide plate.

Background

Generally, in a display device, a function of a backlight module is to provide a uniform light source. However, if the light guide plate (LGF) of the backlight module is displaced during the assembly process, an excessive and non-uniform distance is generated between the light guide plate and the LED tube, which will affect the brightness performance in the display area (or referred to as the visible area) of the terminal display device. For example, in fig. 1A, the light guide plate 20 of the backlight module 100 is assembled to generate a counterclockwise deviation, so that a non-uniform distance is generated between the light guide plate and the LED lamp 10, and the maximum distance d1 is greater than 0.15 mm. In addition, in fig. 1B, the light guide plate 20 of the backlight module 100 is shifted clockwise after being assembled, so that the LED lamp 10 is also unevenly spaced, and the maximum spacing d2 is greater than 0.15 mm. The excessive and non-uniform distance between the light guide plate 20 and the LED tube 10 causes the problem of dark fringe at the edge, which finally affects the uniformity of the overall luminance of the display device.

In general, when assembling a light guide plate, the light guide plate is fixed by a light guide plate fixing tape (LGF fixing tape). As shown in fig. 2, the backlight module 200 has a display area I and a non-display area II, and mainly includes a base 210, a reflective film 220, a light guide plate 230, a lower diffusion sheet 240a, a vertical prism sheet 240b, a horizontal prism sheet 240c, an upper diffusion sheet 240d, a light guide plate fixing tape 250, an aluminum frame 260, a plastic frame 270a, a plastic frame 270b, and a double-sided adhesive 280. Generally, in order to fix the light guide plate 230 on the base 210, the reflective film 220 is inwardly receded from the edge of the display region I by a distance D, i.e., the reflective film 220 is not formed in the region covered by the distance D of about 1.06mm, and the light guide plate 230 and the base 210 are attached together by the light guide plate fixing tape 250, thereby fixing the light guide plate 230. However, in the area covered by the distance D, the brightness of the area appears dark due to the absence of the reflective film 220 and the rough surface of the base 210.

Therefore, how to improve the assembly precision of the light guide plate of the backlight module and further improve the problem of the edge brightness of the display device is an important issue to be considered in the industry.

Disclosure of Invention

In view of the above, the present invention provides a backlight module, comprising: a base having a first main body portion, a first bending portion and a second bending portion; the reflector plate is positioned on the first main body part, and the light guide plate is positioned on the reflector plate and is provided with a second main body part, a first buckling part and a second buckling part; and an optical stack on the second body portion and having a protrusion extending beyond the second body portion; the first bending part is clamped between the protruding part and the first buckling part, and the second bending part is clamped between the protruding part and the second buckling part.

According to one or more embodiments of the present invention, the first locking portion and the second locking portion are both portions protruding outward from the lower half of the second main body portion and are respectively located at two ends of a long side of the second main body portion.

According to one or more embodiments of the present invention, the first bending portion has a first extending portion, a second extending portion and a third extending portion; the second bending portion has a fourth extending portion, a fifth extending portion and a sixth extending portion.

According to one or more embodiments of the present invention, an acute angle is formed between the first extending portion and the first main body portion; an obtuse angle is formed between the first extending part and the second extending part; an obtuse angle is formed between the second extending portion and the third extending portion.

According to one or more embodiments of the present invention, an acute angle is formed between the fourth extending portion and the first main body portion; an obtuse angle is formed between the fourth extending part and the fifth extending part; an obtuse angle is formed between the fifth extending part and the sixth extending part.

According to one or more embodiments of the present invention, the second extending portion and the third extending portion form a first elastic sheet; the fifth extending part and the sixth extending part form a second elastic sheet.

According to one or more embodiments of the present invention, the backlight module has a display area, and the reflective sheet occupies the display area.

According to one or more embodiments of the present invention, the backlight module further has a non-display area, and the first locking portion, the second locking portion, the first bending portion, the second bending portion and the protruding portion are all located in the non-display area.

According to one or more embodiments of the present invention, the optical stack includes an upper diffusion sheet, a horizontal prism sheet, a vertical prism sheet, and a lower diffusion sheet in sequence from top to bottom.

According to one or more embodiments of the present invention, the light guide plate and an LED tube have a uniform distance, and the distance is not greater than 0.15 mm.

Drawings

FIG. 1A is a schematic view illustrating a backlight module according to the prior art.

FIG. 1B is a schematic view illustrating a backlight module according to the prior art.

FIG. 2 is a cross-sectional view of a backlight module according to the prior art.

Fig. 3A is a top view of a backlight module according to an embodiment of the invention.

Fig. 3B to 3E are partially enlarged perspective views illustrating the backlight module in the area B of fig. 3A.

FIG. 4 is a cross-sectional view of the backlight module taken along line A-A of FIG. 3A.

FIG. 5 is a schematic view illustrating a backlight module according to an embodiment of the invention.

Reference numerals:

10-LED lamp tube

20-light guide plate

100-backlight module

200-backlight module

210-base

220-reflective film

230-light guide plate

240a lower diffusion sheet

240b vertical prism sheet

240c horizontal prism sheet

240d upper diffusion sheet

250-light guide plate fixing adhesive tape

260-aluminum frame

270 a-rubber frame

270 b-rubber frame

280-double sided adhesive tape

300-backlight module

410 to the base

410a to first body part

410 b-first extension

410c to the second extension part

410d, 1410d, 2410d, 3410d to the third extension part

420-reflecting sheet

430-light guide plate

430a to second body part

430b to first fastening part

440 optical stack

440a lower diffusion sheet

440b vertical prism sheet

440c horizontal prism sheet

440 d-upper diffusion sheet

460-aluminum frame

470 a-rubber frame

470 b-rubber frame

480-double-sided adhesive tape

490-LED Lamp

4100-first bending part

A-A. section line

B. C-region

d1, d2, d 3-spacing

Distance D-

E-projection

I-display area

II-non-display area

In accordance with conventional practice, the various features and elements of the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the particular features and elements of the invention in order to best explain the principles of the invention. Moreover, the same or similar reference numbers will be used throughout the drawings to refer to similar components and parts.

Detailed Description

For the purpose of further understanding and appreciation of the objects, shapes, structural device features, and functions of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

Various embodiments or examples are provided below to enable different features of the provided objects to be implemented. Specific examples of components and arrangements are described below to simplify the present disclosure and are not intended to be limiting; the size and shape of the device are also not limited by the scope or value of the invention, but may depend on the device's processing conditions or desired characteristics. For example, the technical features of the present invention are described using cross-sectional views, which are schematic illustrations of idealized embodiments. Thus, variations in the shapes of the illustrations as a result of manufacturing processes and/or tolerances are to be expected and should not be construed as limiting.

Furthermore, spatially relative terms, such as "below," "below …," "below," "…" and "above," are used for ease of describing the relationship between elements or features depicted in the drawings; spatially relative terms may encompass different orientations of the component in use or operation in addition to the orientation depicted in the figures.

The following description of the embodiments of the present invention is provided with reference to the drawings. First, to improve the assembling precision of the light guide plate of the backlight module, the luminance performance in the display area of the display device is not affected. Therefore, in the embodiment of the invention, the buckling part is designed on the light guide plate, the hook-shaped elastic sheet structure is manufactured at the tail end of the M base (M-Chassis), and then the hook-shaped elastic sheet structure at the tail end of the M base is abutted against the buckling part of the light guide plate, so that the light guide plate can be stably fixed at the preset position, and the assembly precision is improved. Therefore, the light guide plate is not required to be fixed by the light guide plate fixing adhesive tape, and the reflector plate can be extended to the area where the original light guide plate fixing adhesive tape is located, so that the problem that the edge brightness of the display equipment is dark is solved.

First, referring to fig. 3A and fig. 3B together, fig. 3A is a top view of a backlight module according to an embodiment of the invention. FIG. 3B is a partially enlarged perspective view of the backlight module in the area B of FIG. 3A.

As shown in fig. 3A, in the embodiment, the two ends of one long side of the backlight module 300, i.e. two areas indicated by reference numeral B, C, are provided with hook-shaped elastic sheet structures, and a fastening portion is added at the front end of the light guide plate, so as to effectively fix the light guide plate on the light incident side of the LED and the reflector plate, thereby achieving the effect of uniform brightness. Hereinafter, in the following description, the hook-shaped elastic sheet structure will be described by using the names of "first bending portion" and "second bending portion".

As shown in fig. 3B, in the area indicated by the reference sign B of the backlight module 300, the third extending portion 410d at the end of the first bending portion 4100 is engaged with the first engaging portion 430B of the light guide plate (see fig. 4). The remaining components of the backlight module 300 of FIG. 3B will be further described later with reference to the cross-sectional view shown in FIG. 4. In addition, it should be noted that the structure in the region indicated by the reference character C of the backlight module 300 is substantially symmetrical to the structure in the region indicated by the reference character B, so that the same or similar components can be referred to the related description of fig. 4. In addition, in other embodiments, the surface of the first locking portion 430b contacting the third extending portion 410d may be further designed to be a rough surface, so as to increase the friction force therebetween, prevent the third extending portion 410d from sliding, and improve the fixing effect. In other embodiments, the third extending portion 410d may be further replaced with a rubber material to increase friction and improve the fixing effect. In addition, as shown in fig. 3C, 3D and 3E, in other embodiments, the contact end of the third extending portion 410D and the first locking portion 430b has different shapes, so as to more effectively support the corner cut of the first locking portion 430b, enhance the pushing force between the third extending portion 410D and the first locking portion 430b, and improve the fixing effect. For example, as shown in fig. 3C, the upper surface of the third extension 1410d near the end is thinned to form a cut surface; as shown in fig. 3D, the upper and lower surfaces of the third extending portion 2410D near the end are all thinned to form a cutting plane; as shown in fig. 3E, the lower surface of the third extending portion 3410d at the proximal end is thinned to form a cut surface. As shown in fig. 3C, 3D and 3E, the ends of the third extending portions 1410D, 2410D and 3410D respectively form a tapered portion, i.e. different tip shapes, which can more effectively support the corner cut of the first locking portion 430b to improve the fixing effect. It should be noted that any of the above possible embodiments may be combined, for example, in the embodiment of fig. 3C, a rubber anti-slip surface or a rough surface may be formed on the surface of the third extending portion.

Next, referring to fig. 4, fig. 4 is a cross-sectional view of the backlight module taken along a line a-a of fig. 3A. As shown in fig. 4, the backlight module 300 includes a base 410, a reflective sheet 420, a light guide plate 430, an optical stack layer 440, an aluminum frame 460, a plastic frame 470a, a plastic frame 470b, and a double-sided adhesive 480.

As shown in fig. 4, the backlight module 300 has a display area I and a non-display area II. The base 410 has a first body portion 410a, a first bending portion 4100 and a second bending portion. However, since fig. 4 is a cross-sectional view of the region indicated by the reference symbol B in fig. 3A, the second bending portion on the opposite side is not visible, but can be illustrated by referring to fig. 3A. As shown in fig. 3A, the second bending portion is symmetrical to the first bending portion 4100 and located in the region indicated by the symbol C. That is, the second bending portion and the first bending portion 4100 are independently located at two ends of the first body portion 410a in the length direction, i.e. the regions indicated by the reference signs C and B. In this embodiment, the base 410 is a planar M base, and the material is, for example, a metal material such as iron. In this embodiment, the second bent portion and the first bent portion 4100 are the same in structure and material, and are different only in that they are located at different positions of the first body portion 410 a.

As shown in fig. 4, the reflective sheet 420 is positioned on the first body 410 a. In this embodiment, the reflective sheet 420 occupies the display area I, that is, the reflective sheet 420 extends a distance D to the edge of the display area I compared to the reflective film 220 of fig. 2. In other words, in the embodiment of the invention, the light guide plate does not need to be fixed in a manner of sacrificing a part of the area of the edge of the display area I, so that the reflective sheet 420 can occupy the display area I to increase the brightness of the edge of the display area I.

In addition, as shown in fig. 4, the light guide plate 430 is located on the reflective sheet 420, wherein the light guide plate 430 has a second main body 430a, a first locking portion 430b and a second locking portion. However, since fig. 4 is a cross-sectional view of the region indicated by the reference symbol B in fig. 3A, the second locking portion on the opposite side is not visible, and thus the description is given with reference to fig. 3A again. As shown in fig. 3A, the second locking portion is symmetrical to the first locking portion 430b and located in the region indicated by the reference symbol C. That is, the second locking portion and the first locking portion 430B are located at two ends of the second body portion 430a in the length direction independently, i.e. the areas indicated by the reference signs C and B. The first locking portion 430b corresponds to the first bent portion 4100, and the second locking portion corresponds to the second bent portion. As mentioned above, the second locking portion and the second bending portion are located in the region labeled with the reference character C, and the structures in the regions labeled with the reference character C and the reference character C are symmetrical and have the same function, and are all used for precisely fixing the light guide plate 430. Therefore, in the following description, the first locking portion 430B and the first bending portion 4100 on the side of the region indicated by the reference sign B are taken as an example to describe the structure for fixing the light guide plate 430 according to the embodiment of the present invention.

As shown in FIG. 4, the optical stack 440 is disposed on the second main body 430a and has a protrusion extending beyond the second main body 430 a. Here, the protrusion refers to a portion of the optical stack 440 beyond the display area I and indicated by the reference symbol E. As shown in FIG. 4, a receiving space is formed between the protrusion designated by reference numeral E and the first locking portion 430b below, so as to receive the end portion of the first bending portion 4100. That is, the first bent portion 4100 is sandwiched between the protruding portion denoted by symbol E and the first latching portion 430 b. Similarly, as shown in fig. 3A, in the region indicated by the reference character C, another accommodating space is formed between the protruding portion indicated by the reference character E and the second locking portion below the protruding portion, so as to accommodate the end portion of the second bending portion. That is, the second bending portion is sandwiched between the protruding portion indicated by the symbol E and the second buckling portion.

Referring to fig. 4, in addition, the first bending portion 4100 has a first extending portion 410b, a second extending portion 410c and a third extending portion 410d continuously extending from the first main body portion 410 a. In addition, an acute angle is formed between the first extending portion 410b and the first main body portion 410 a; the first extension portion 410b and the second extension portion 410c have an obtuse angle therebetween; the second extension portion 410c and the third extension portion 410d have an obtuse angle therebetween. In this embodiment, the first bending portion 4100 is an elastic sheet structure, and the first bending portion 4100 is formed by designing angles among the first extending portion 410b, the second extending portion 410c and the third extending portion 410d, which is the so-called hook-type spring structure. In this embodiment, the first extension portion 410b, the second extension portion 410c and the third extension portion 410d are integrally formed with the first main body portion 410 a. In other embodiments, the second extension portion 410c and the third extension portion 410d form an elastic sheet-like structure, and the elastic sheet-like structure is not integrally formed with the first extension portion 410b and the first main body portion 410 a.

Similarly, as shown in fig. 3A, in the region indicated by the reference character C, the second bending portion also has three extending portions, which are a fourth extending portion, a fifth extending portion and a sixth extending portion continuously extending from the first main body portion 410 a. Similarly, an acute angle is formed between the fourth extending portion and the first main body portion 410 a; an obtuse angle is formed between the fourth extending part and the fifth extending part; an obtuse angle is formed between the fifth extending part and the sixth extending part. In this embodiment, the second bending portion is also a sheet structure with elasticity, and the second bending portion formed by the design of the angle between the fourth extending portion, the fifth extending portion and the sixth extending portion is the so-called hook-shaped elastic sheet structure. In this embodiment, the fourth extending portion, the fifth extending portion and the sixth extending portion are integrally formed with the first body portion 410 a. In other embodiments, the fifth extending portion and the sixth extending portion form an elastic sheet-like structure, and the elastic sheet-like structure is not integrally formed with the fourth extending portion and the first main body portion 410 a.

Referring to fig. 3A and 4, the first locking portion 430b and the second locking portion of the light guide plate 430 are both portions protruding outward from the lower half of the second main body portion 430a, and are respectively located at two ends of a long side of the second main body portion 430a, which is indicated by reference numeral B, C. Since the first locking portion 430b and the second locking portion are formed on the lower half portion of the second main body 430a, corresponding accommodating spaces can be formed with the protruding portion (i.e. designated by the symbol E) of the optical stack 440 above to accommodate the third extending portion 410d of the first bending portion 4100 and the sixth extending portion of the second bending portion, respectively. By the light guide plate buckle design of the embodiment of the invention, the position of the light guide plate can be effectively fixed. Therefore, the area under the light guide plate corresponding to the width of the distance D originally needs to be attached to the first body 410a of the chassis 410 by the light guide plate fixing tape, but the light guide plate fastening design according to the embodiment of the present invention can be omitted. Thus, as shown in fig. 4, the embodiment of the invention can extend the reflector 420 to the edge of the display area I by a distance D, thereby improving the problem of dark luminance at the edge of the display device.

In addition, referring to fig. 4, in the embodiment of the present invention, the fastening structure formed by the first fastening portion 430b, the second fastening portion, the first bending portion 4100, the second bending portion and the protrusion portion denoted by the symbol E is all located in the non-display area II. Therefore, the display area I is not occupied, and the light guide plate 430 can be fixed, thereby solving the problem of low luminance in the display area of the display device caused by easy deviation of the light guide plate in the prior art.

In addition, as shown in fig. 4, the optical stack 440 includes an upper diffusion sheet 440d, a horizontal prism sheet 440c, a vertical prism sheet 440b, and a lower diffusion sheet 440a from top to bottom in sequence. The aluminum frame 460 may accommodate the base 410, the reflective sheet 420, the light guide plate 430, and the optical stack 440 therein. The first bending portion 4100 and the second bending portion are partially located on the aluminum frame 460, and the other portion is located on the plastic frame 470 a. In addition, a double-sided tape 480 is disposed on the tape frame 470 a. The glue frame 470b is disposed next to the glue frame 470 a.

Next, referring to fig. 5, fig. 5 is a schematic view illustrating a backlight module according to an embodiment of the invention. As shown in fig. 5, since the light guide plate locking design is adopted in the embodiment of the present invention, the position of the light guide plate 430 can be effectively fixed, so that a uniform distance is formed between the light guide plate 430 and an LED lamp 490, and the distance is not greater than 0.15 mm. Therefore, the problems of low and uneven brightness or dark edge in the display area of the display device in the prior art are avoided.

In summary, in the embodiment of the invention, the fastening portion is designed on the light guide plate, the hook-shaped elastic sheet structure is formed at the end of the M base, and then the hook-shaped elastic sheet structure abuts against the fastening portion of the light guide plate, so as to improve the assembly precision of the light guide plate and prevent the light guide plate from shifting. Therefore, the light guide plate is not required to be fixed by the light guide plate fixing adhesive tape, the reflection sheet can be extended to cover the area where the original light guide plate fixing adhesive tape is located, and the luminance quality of the edge of the display device is improved. Furthermore, in the embodiment of the invention, the first bending portion 4100 and the second bending portion are embedded in the internal structure, which not only can increase the overall bonding stability and reduce the overall thickness of the product, but also can make the display device have more uniform luminance performance.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.