TWI743880B - Backlight module and display device - Google Patents

Abstract

A backlight module includes a back plate, a plastic frame provided on the back plate, a light emitting unit, a light guide plate, and at least one fixing unit. The light emitting unit is disposed on one side of the back plate and extends along a first direction. The fixing unit simultaneously limits the plastic frame, the back plate and the light guide plate along the first direction. The fixing unit extends in the same direction as the light-emitting unit, so the fixing unit limits the plastic frame, the back plate, and the light guide plate at the same time along the first direction, which can improve the convenience of alignment and avoid deflection during assembly, optimizing the assembly process and improving the yield. The invention also provides a display device including the backlight module.

Description

Backlight module and display device

The invention relates to an optical device, in particular to a backlight module and a display device.

In the existing display device, a backlight module is mainly used to provide a backlight source for the display panel. The backlight module of the current display device can be divided into a direct type and a side type according to its light incident mode. Among them, the edge-type backlight module uses a combination of light bars with a plurality of light-emitting diode elements, light guide plates and optical films, etc., to provide the backlight source required by the display panel.

In the existing edge-lit backlight module, a plurality of positioning pillars are formed on the back plate of the backlight module, and the positioning pillars extend along the thickness direction of the light guide plate (Z-axis direction), and the back of the light guide plate is provided There is a limit hole corresponding to the positioning column and the positioning column is aligned and assembled.

The plurality of positioning posts formed on the back plate extend perpendicular to the thickness direction of the light guide plate, so the thickness of the overall backlight module cannot meet the market’s light and thin requirements; in addition, when assembling, the assembler cannot look directly at the guide plate. Whether the limit hole on the back of the light board is aligned with the positioning post, misalignment is likely to occur during the assembly process, which will lead to the risk of deformation or skewing of the positioning post, resulting in damage to the light guide plate or the gap between the light guide plate and the light bar is unstable , Affecting the quality of the backlight module.

Therefore, the purpose of the present invention is to provide a backlight module with a novel position-limiting design.

The backlight module of the present invention includes a back plate, a plastic frame ringed on the back plate, a light-emitting unit, a light guide plate, and at least one fixing unit. The light emitting unit is arranged on one side of the back plate and extends along a first direction. The back plate includes a plate body and a side wall connected to the periphery of the plate body. The light guide plate is placed on the plate body of the back plate, and the light guide plate has a light incident surface for receiving light from the light-emitting unit. The fixing unit simultaneously limits the plastic frame, the back plate and the light guide plate along the first direction.

Another technical means of the present invention is that at least one first perforation is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and the fixing unit is formed by the plastic frame The surrounding wall integrally extends through the first through hole, and abuts against the light guide plate.

Another technical means of the present invention is that the fixing unit includes a limit post.

Another technical means of the present invention is that the fixing unit further includes a reinforcing member arranged in the limiting column.

Another technical means of the present invention is that the end of the reinforcing member protrudes from the limiting column and abuts against the light guide plate.

Another technical means of the present invention is that a first through hole is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and the surrounding wall is formed with a first hole and A second hole corresponding to the hole is penetrated, and the fixing unit penetrates the first hole and the second hole to abut and limit the light guide plate.

Another technical means of the present invention is that the second through hole of the plastic frame is formed with an internal thread, and the fixing unit is screwed into the second through hole and passes through the first through hole to limit the light guide plate.

Another technical means of the present invention is that the first through hole of the back plate is formed with an internal thread, and the fixing unit passes through the second through hole and is screwed to the first through hole to limit the light guide plate.

Another technical means of the present invention is that the back plate further includes a sleeve integrally extending from the side wall, the sleeve surrounds a first through hole and has an internal thread, and the plastic frame includes a sleeve surrounding the back plate. The surrounding wall of the peripheral edge of the side wall is formed with a second perforation, the sleeve of the back plate extends into the second perforation, and the fixing unit is screwed with the sleeve.

Another technical means of the present invention is that at least one notch is formed on the side of the light guide plate facing the fixing unit, and the end of the at least one fixing unit abuts against the notch.

Another technical means of the present invention is that the light guide plate has two opposite sides, each of the two sides has a notch extending along the first direction, the number of the fixing unit is two, and the ends of the two fixing units Respectively hit the two gaps.

Another object of the present invention is to provide a display device including the aforementioned backlight module and a display panel disposed on the backlight module.

The effect of the present invention is that the fixing unit and the light-emitting unit extend in the same direction, so the fixing unit simultaneously limits the plastic frame, the back plate, and the light guide plate along the first direction, which can effectively avoid the deflection during assembly. , Optimize the assembly procedure and increase the yield rate.

The features and technical content of the related patent applications of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Before detailed description, it should be noted that similar components are denoted by the same numbers.

1 and 2 are the first preferred embodiment of the backlight module 2 of the present invention, which includes a back plate 21, a plastic frame 22 ringed around the back plate 21, a light emitting unit 23, and a light guide plate 24 , And two fixed units 25. The light emitting unit 23 is arranged on one side of the back plate 21 and extends along a first direction X. The back plate 21 includes a plate body 211 and a side wall 212 connected to the periphery of the plate body 211. The light guide plate 24 is placed on the plate body 211 of the back plate 21 and is accommodated in a space surrounded by the plate body 211 and the side wall 212. The light guide plate 24 has a light incident surface 241 for receiving The light of the light-emitting unit 23. It should be noted that the light guide plate 24 has two opposite sides 242, and the two sides 242 extend along a second direction Y, and the second direction Y is perpendicular to the first direction X. As shown in FIG. 2, each side 242 has at least one notch 243, and the two fixing units 25 are respectively disposed corresponding to the two notches 243 (due to the viewing angle, only one side is shown in FIG. 2). For example, the notch 243 can be disposed at any position or corner of the side 242 of the light guide plate 24, and the notch 243 is used to accommodate the fixing unit 25 extending along the first direction X. Preferably, the notch 243 is arranged at a corner position adjacent to the light incident surface of the light guide plate 24 to ensure that the optical appearance of the backlight module will not be affected by the notch 243. The notch 243 can also be provided on the side 242 of the light guide plate 24 at the non-corner position. When the fixing unit 25 penetrates into the notch 243, the light guide plate 24 can be moved in the first direction X and the second direction Y at the same time. Limit.

Continuing to refer to FIG. 2, the side wall 212 of the back plate 21 is formed with two first through holes 213 respectively corresponding to the two notches 243 of the light guide plate 24. The plastic frame 22 includes a surrounding wall 222 surrounding the periphery of the side wall 212 of the back plate 21. In this embodiment, each fixing unit 25 includes a limiting post 251 integrally extending from the surrounding wall 222 of the plastic frame 22.

It should be further explained that each limit post 251 may be a hollow design as shown in FIG. 2 or a solid design. Wherein, each limit post 251 may be a solid structure formed by one body as shown in FIG. 3, or a reinforcing member 252 is wrapped in the limit post 251 in the manner of injection coating, as shown in FIG. 4 Shown. In addition, the reinforcing member 252 may also be a screw as shown in FIG. 5, which is directly inserted into the limiting post 251 in the shape of a through hole. At this time, the end of the reinforcing member 252 protrudes from the limiting post 251. And the light guide plate 24 is pressed against the limit, so if there is an assembly tolerance between the limit post 251 and the light guide plate 24, the screwing of the reinforcing member 252 can also overcome the tolerance between the two , The effect of resisting and limiting the light guide plate 24 can also be achieved.

With the above structure, when the backlight module 2 of the present invention is assembled, the limiting post 251 of the fixing unit 25 penetrates the first through hole 213 on the side wall 212 of the back plate 21 along the first direction X , And then extend into the corresponding notch 243 of the light guide plate 24. According to this, the fixing unit 25 can be used to limit the plastic frame 22, the back plate 21 and the light guide plate 24 at the same time.

The above design of the backlight module 2 of the present invention has the following advantages:

1. The limiting post 251 of the fixing unit 25 is integrally formed with the rubber frame 22, which can reduce the tolerance problems caused by post-processing.

2. Since the limit post 251 of the fixing unit 25 and the notch 243 of the light guide plate 24 also extend along the first direction X, when the light guide plate 24 and the fixing unit 25 are assembled in position, the assembler can see Whether the notch 243 of the light guide plate 24 is aligned with the limiting post 251 for assembly, thereby reducing the risk of deformation or skewing of the limiting post 251.

3. After the assembly of the present invention is completed, the fixing unit 25 can simultaneously limit the back plate 21, the plastic frame 22, and the light guide plate 24, which not only can limit the position of the light guide plate 24 in the first direction X, but also The fixing unit 25 directly abuts the side 242 of the light guide plate 24, which is more conducive to the stability of the overall structure and improves the yield of the finished product.

After the assembly of the backlight module 2 of the present invention is completed, it is formed as shown in FIG. 6, and after adding a display panel 3, it becomes the display device as shown in FIG. 7.

Referring to FIG. 8, it is a second preferred embodiment of the backlight module 4 of the present invention, which also includes a back plate 41, a plastic frame 42 around the periphery of the back plate 41, a light emitting unit 43, a light guide plate 44, and Two fixed units 45 (only one is shown due to the viewing angle). The back plate 41 includes a plate body 411 and a side wall 412 connected to the periphery of the plate body 411. The side wall 412 is formed with two first through holes 413 (only one is shown due to the viewing angle). The plastic frame 42 includes a surrounding wall 422 surrounding the side wall 412, and two second through holes 423 corresponding to the first through holes 413 are formed on the surrounding wall 422 (only one is shown due to the viewing angle).

In this embodiment, the fixing unit 45 directly penetrates the first through hole 413 and the second through hole 423 to abut and limit the light guide plate 44. In actual implementation, internal threads may also be formed in the first through hole 413 of the back plate 41 or the second through hole 423 of the rubber frame 42, so that the fixing unit 45 can be more firmly connected to the The plastic frame 42 is combined with the back plate 41 and simultaneously achieves the function of limiting the light guide plate 44.

Referring to FIG. 9, it is a third preferred embodiment of the backlight module 5 of the present invention, which also includes a back plate 51, a plastic frame 52 around the periphery of the back plate 51, a light-emitting unit 53, a light guide plate 54, and Two fixed units 55 (only one is shown due to the viewing angle). The back plate 51 includes a plate body 511, a side wall 512 connected to the periphery of the plate body 511, and two sleeves 513 integrally extending from the side wall 512 (only one is shown due to the viewing angle), each sleeve 513 A first through hole 514 is surrounded and has an internal thread. The plastic frame 52 includes a surrounding wall 522 formed with two second through holes 523 corresponding to the two sleeves 513 (only one is shown due to the viewing angle), and the two sets of the back plate 51 The barrel 513 is extended into the two second through holes 523 respectively. Through the structure and arrangement of the sleeve 513, the stability of the combination of the back plate 51 and the rubber frame 52 can be enhanced, and the two fixing units 55 are screwed into the two sleeves 513, and the two sleeves 513 can also be increased. The stability of the combination of the fixing unit 55 and the back plate 51.

In summary, in the backlight module of the present invention, the fixing unit simultaneously limits the plastic frame, the back plate, and the light guide plate along the first direction, which not only improves the convenience of alignment, but also effectively avoids deviation during assembly. Tilt, optimize the assembly procedure, increase the yield rate, and also increase the stability of the limit of the light guide plate.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent.

2: Backlight module 21: Backplane 211: Board 212: Sidewall 213: The first perforation 22: plastic frame 222: around the wall 23: light-emitting unit 24: Light guide plate 241: Glossy Surface 242: side 243: Gap 25: fixed unit 251: Limit Column 252: Reinforcement 3: display panel 4: Backlight module 41: Backplane 411: plate body 412: Sidewall 413: first piercing 42: plastic frame 422: around the wall 423: second perforation 43: light-emitting unit 44: light guide plate 45: fixed unit 5: Backlight module 51: Backplane 511: Board 512: Sidewall 513: Sleeve 514: first piercing 52: plastic frame 522: Surrounding the Wall 523: second piercing 53: light-emitting unit 54: light guide plate 55: fixed unit

Fig. 1 is a perspective view showing the first preferred embodiment of the backlight module of the present invention; Figure 2 is a top view, which is an enlargement of the frame on the right side of Figure 1, in which a limit post is hollow; Figure 3 is a top view illustrating that the limit post is a solid state of integral molding; Figure 4 is a top view illustrating that the limiting column is filled with a reinforcing member to become a solid state; Figure 5 is a top view illustrating the state where the reinforcing member is a screw; Figure 6 is a cross-sectional view illustrating the assembled form of the first preferred example; FIG. 7 is a cross-sectional view illustrating that the first preferred embodiment adds a display panel to become a display device; Fig. 8 is a top view showing the second preferred embodiment of the backlight module of the present invention; and FIG. 9 is a top view showing the third preferred embodiment of the backlight module of the present invention.

2: Backlight module

21: Backplane

211: Board

212: Sidewall

213: The first perforation

22: plastic frame

222: around the wall

23: light-emitting unit

24: Light guide plate

241: Glossy Surface

242: side

243: Gap

25: fixed unit

251: Limit Column

Claims (10)

A backlight module includes: a back plate, including a plate body, and a side wall connected to the periphery of the plate body, wherein at least one first perforation is formed on the side wall of the back plate; On the back plate, wherein the plastic frame includes a surrounding wall surrounding the peripheral edge of the side wall of the back plate; a light emitting unit arranged on one side of the back plate and extending along a first direction; and a light guide plate, Placed on the plate body of the back plate, the light guide plate has a light incident surface for receiving light from the light-emitting unit; and at least one fixing unit that simultaneously limits the plastic frame and the back plate along the first direction, And the light guide plate, wherein the fixing unit is integrally extended from the surrounding wall of the plastic frame, passes through the first perforation, and abuts against the light guide plate. The backlight module according to claim 1, wherein the fixing unit includes a limit post. The backlight module according to claim 2, wherein the fixing unit further includes a reinforcing member arranged in the limiting column. The backlight module according to claim 3, wherein the end of the reinforcing member protrudes from the limiting column and abuts against the light guide plate. The backlight module according to claim 1, wherein at least one notch is formed on a side of the light guide plate facing the fixing unit, and an end of the at least one fixing unit abuts against the notch. The backlight module according to claim 1, wherein the light guide plate has two opposite sides, the two sides respectively have a notch extending along the first direction, and the number of fixing units Two, the ends of the two fixing units respectively abut against the two notches. A backlight module includes: a back plate, including a plate body, and a side wall connected to the periphery of the plate body; a plastic frame arranged around the back plate; and a light emitting unit arranged on one of the back plates Side and extending along a first direction; a light guide plate placed on the body of the back plate, the light guide plate having a light incident surface for receiving light from the light-emitting unit; and at least one fixing unit along the The first direction simultaneously limits the plastic frame, the back plate, and the light guide plate; wherein, the back plate further includes at least one sleeve integrally extending from the side wall, and the sleeve surrounds a first perforation and has an internal thread , The plastic frame includes a surrounding wall surrounding the peripheral edge of the side wall of the back plate, at least one second perforation is formed on the surrounding wall, the sleeve of the back plate extends into the second perforation, and the fixing unit Threaded with the sleeve. The backlight module of claim 7, wherein at least one notch is formed on a side of the light guide plate facing the fixing unit, and an end of the at least one fixing unit abuts against the notch. The backlight module according to claim 7, wherein the light guide plate has two opposite sides, each of the two sides has a notch extending along the first direction, the number of fixing units is two, and the two fixing The ends of the unit abut against the two gaps respectively. A display device includes the backlight module according to any one of claims 1 to 9 and a display panel arranged on the backlight module.

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