TWM492451U - Backlight module - Google Patents

Abstract

A backlight module includes a baseplate, an optical film and a spacer pin. The baseplate has a first joining part. The optical film has a through hole. The spacer pin includes a second joining part, a body, an eccentric part and a first abutting part. The second joining part rotatably joins with the first joining part. The body connects to the second joining part and has a first centerline. The body can rotate about the first centerline relative to the baseplate through the second joining part. The eccentric part connects to the body and has a second centerline parallel to the first centerline. The eccentric part passes through the through hole and snaps with the through hole. The first abutting part connects to the junction of the body and the eccentric part, and abuts against the optical film, so as to support and clamp the optical film.

Description

Backlight module

This creation is about a backlight module.

The backlight module is one of the key components of the liquid crystal display. Its function is to supply sufficient light and uniform light source to enable the liquid crystal display to display images normally.

Generally, an optical film is disposed in the backlight module, and by controlling the ratio of the light transmission and the reflected light of the optical film and setting the proper position thereof, the technical requirements of the optical design of the backlight module can be satisfied.

Traditionally, in the process of installing an optical film, the assembler first tightens the optical film by hand, and then presses the corresponding spacer pin into the corresponding perforation of the optical film to fix the optical film to the backlight mode. In the group. However, the method of first tightening and reassembling easily causes uncontrolled deformation of the optical film, and is also liable to cause assembly failure.

One of the technical aspects of the present invention is to provide a backlight module that can mount an optical film to a backlight module without pre-tensioning the optical film, thereby making the installation of the optical film easier. Avoiding poor assembly chance.

According to an embodiment of the present invention, a backlight module includes a bottom plate, an optical film, and a partition pin. The bottom plate has a first engagement portion. The optical film has perforations. The dividing pin includes a second connecting portion, a body portion, an eccentric portion and a first abutting portion. The second connecting portion is rotatably engaged with the first engaging portion. The body portion is connected to the second connecting portion and has a first center line, wherein the body portion is rotatable relative to the bottom plate by the second connecting portion with the first center line as an axis. The eccentric portion connects the body portion and has a second centerline parallel to the first centerline, wherein the eccentric portion passes through the through hole and is engaged with the through hole. The first abutting portion is connected to the boundary between the body portion and the eccentric portion and abuts against the optical film to support and hold the optical film.

In one or more embodiments of the present invention, the eccentric portion has a groove. This groove abuts the first abutment and the optical film is snapped into the groove.

In one or more embodiments of the present invention, the eccentric portion has a groove. The groove abuts the first abutment and the second centerline is between the first centerline and the groove.

In one or more embodiments of the present invention, the split pin further includes a second abutting portion. The second abutting portion is connected to the boundary between the body portion and the second connecting portion for abutting against the bottom plate.

In one or more embodiments of the present invention, the first connecting portion is an oblong hole. The second connecting portion includes a shaft body and two elastic arms. The shaft body is connected to the body portion and passes through the oblong hole. The elastic arms are connected to the shaft body and extend to the two sides of the shaft body respectively, and the elastic arms are engaged with the two ends of the oblong hole.

In one or more embodiments of the present invention, the eccentric portion is in the column And the outer diameter of the eccentric portion is smaller than the diameter of the perforation.

According to another embodiment of the present invention, a backlight module includes a bottom plate, an optical film, and a partition pin. The bottom plate has a first engagement portion. The optical film has perforations. The dividing pin includes a second connecting portion, a body portion, an eccentric portion and a first abutting portion. The second connecting portion is connected to the first connecting portion. The body portion connects the second connecting portion and has a first center line. The eccentric portion is detachably coupled to the body portion, and the eccentric portion is rotatable relative to the main body portion with the first center line as an axis, and has a second center line parallel to the first center line, wherein the eccentric portion passes through the through hole and is engaged with the through hole . The first abutting portion connects the body portion and abuts the eccentric portion and the optical film to support and hold the optical film.

In one or more embodiments of the present invention, the body portion includes a rotating post. The rotating column extends substantially along the first center line, the eccentric portion has a rotating hole for the rotating column to be inserted, and is in rotational engagement with the rotating column, and the center of the rotating hole is offset from the second center line.

In one or more embodiments of the present invention, the body portion includes a rotating hole. The rotating hole extends substantially along the first center line, the eccentric portion has a rotating column inserted into the rotating hole, and is in rotational engagement with the rotating hole, and the axis of the rotating column is offset from the second center line.

In one or more embodiments of the present invention, the first abutting portion has a locking groove. The locking groove extends circumferentially with the first center line as a center. The locking groove has a first end and a second end, and the first center line is located between the first end and the second end. The eccentric portion includes a rotating cap and a locking arm. Rotate the cap through the perforation and engage the perforation. The locking arm is connected to the rotating cap and penetrates into the locking groove, wherein the locking arm slides in the locking groove during the rotation of the eccentric portion relative to the body portion Between the ends.

In one or more embodiments of the present invention, the width of the locking groove is gradually decreased from the first end toward the second end, and the locking groove is tightly engaged with the locking arm adjacent to the inner wall of the second end.

In one or more embodiments of the present invention, the eccentric portion further includes an engaging head, the locking arm is connected between the rotating cap and the engaging head, and passes through the locking groove, and the outer diameter of the engaging head is larger than The width of the locking slot.

In one or more embodiments of the present invention, the eccentric portion has a groove located at the rotating cap and adjacent to the first abutting portion, and the optical film is engaged with the groove.

In one or more embodiments of the present invention, the second centerline is located between the first centerline and the trench.

In one or more embodiments of the present invention, the rotating cap is cylindrical and the outer diameter of the rotating cap is smaller than the aperture of the perforation.

In one or more embodiments of the present invention, the split pin further includes a second abutting portion. The second abutting portion is connected to the boundary between the body portion and the second connecting portion for abutting against the bottom plate.

The above-described embodiments of the present invention have at least the following advantages over the known prior art:

(1) Since the eccentric portion has a second center line, and the second center line is parallel to the first center line. Therefore, when the body portion is rotated relative to the bottom plate by the second connecting portion around the first center line, the eccentric portion also rotates with the body portion with the first center line as an axis. Therefore, when the eccentric portion passes through the through hole, when the eccentric portion is rotated about the first center line, a relative movement occurs between the eccentric portion and the through hole. The optical film is tightened. In this way, the separation distance between the optical film and the bottom plate can be maintained, and the assembly process of the optical film can also be simply completed by the rotation of the separation pin, that is, the optical film is pre-assembled and then pulled. The tightening action is different from the conventional method of tightening the optical film and then assembling it, so that the assembly failure can be effectively avoided.

(2) Since the eccentric portion has a columnar shape and the outer diameter of the eccentric portion is smaller than the diameter of the perforation, the process of the eccentric portion passing through the perforation can be easily performed.

(3) The elastic arm can be opened relative to the shaft body along the long axis direction of the long circular hole, and is engaged with both ends of the long round hole. In this case, since the elastic arm is further opened due to the absence of a larger length space in the oblong hole, the elastic arm can be in a stable state. In this way, if there is no external force applied by the user, the partition pin does not reset to the position before the rotation after the rotation, so that the position of the partition pin relative to the bottom plate is fixed.

100, 200, 300‧‧‧ backlight module

110, 210‧‧‧ bottom plate

111, 211‧‧‧ first connection

120, 220, 320‧‧‧ optical diaphragm

120a, 220a, 320a‧‧‧ perforation

130, 230, 330‧ ‧ separate pins

131, 231‧‧‧ second connection

131a‧‧‧Axis

131b‧‧‧Flexible arm

132, 232, 332‧‧‧ body parts

133, 233, 333‧ ‧ eccentric

133a1‧‧‧ trench

134, 234‧‧‧ first abutment

135‧‧‧second abutment

232a‧‧‧Rotating column

233a‧‧‧Rotating cap

233b‧‧‧Locking arm

233c‧‧‧卡合头

233d‧‧‧Rotating hole

234a‧‧‧Locking slot

234a1‧‧‧ first end

234a2‧‧‧ second end

332a‧‧‧Rotating hole

333d‧‧‧Rotating column

B‧‧‧Width

W‧‧‧ inner wall

CL1‧‧‧ first centerline

CL2‧‧‧ second centerline

D1‧‧‧ aperture

D2‧‧‧ OD

D3‧‧‧ OD

FIG. 1A is a partial cross-sectional side view of the backlight module according to the first embodiment of the present invention.

FIG. 1B is a partial cross-sectional side view of the backlight module of FIG. 1A, in which the dividing pin rotates and the eccentric portion engages with the through hole.

FIG. 2 is a perspective view showing the partition pin of the backlight module of FIG. 1A.

FIG. 3 is a partial cross-sectional side view of the backlight module of FIG. 1A.

FIG. 4 is a diagram showing a backlight module according to a second embodiment of the present invention. Side view of the section.

FIG. 5 is a perspective view showing the partition pin of the backlight module of FIG. 4.

FIG. 6 is a perspective exploded view of the partition pin of the backlight module of FIG. 4.

Figure 7 is a top view of the partition pin of the backlight module of Figure 4.

8 is a partial cross-sectional side view of a backlight module in accordance with a third embodiment of the present invention.

FIG. 9 is a perspective exploded view of the partition pin of the backlight module of FIG. 8.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings. For the sake of clarity, a number of practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the creation. That is to say, in the implementation part of this creation, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein are intended to mean the meaning Furthermore, the definition of the above vocabulary in the commonly used dictionary should be interpreted as the meaning consistent with the field of the present creation in the content of this specification. Unless specifically defined, these terms are not to be interpreted as idealized or overly formal.

First embodiment

Please refer to Figure 1A~2. FIG. 1A is a partial cross-sectional side view of the backlight module 100 according to the first embodiment of the present invention. Figure 1B shows A partial cross-sectional side view of the backlight module 100 of FIG. 1A in which the spacer pin 130 is rotated and the eccentric portion 133 is engaged with the through hole 120a. FIG. 2 is a perspective view showing the partition pin 130 of the backlight module 100 of FIG. 1A. As shown in FIGS. 1A-2, a backlight module 100 includes a bottom plate 110, an optical film 120, and a partition pin 130. The bottom plate 110 has a first engaging portion 111. The optical film 120 has a perforation 120a, and the optical film 120 is made of an elastic material, but the creation is not limited thereto. The partition pin 130 includes a second engaging portion 131 , a body portion 132 , an eccentric portion 133 , and a first abutting portion 134 . The second engaging portion 131 is rotatably engaged with the first engaging portion 111. The body portion 132 is connected to the second connecting portion 131 and has a first center line CL1. The body portion 132 is rotatable relative to the bottom plate 110 by the second connecting portion 131 with the first center line CL1 as an axis. The eccentric portion 133 is coupled to the body portion 132 and has a second center line CL2 parallel to the first center line CL1, wherein the eccentric portion 133 passes through the through hole 120a. After the eccentric portion 133 is rotated with the body portion 132, the eccentric portion 133 is engaged with the through hole 120a. The first abutting portion 134 is connected to the interface between the body portion 132 and the eccentric portion 133 and abuts against the optical film 120 to support and hold the optical film 120. In the present embodiment, the shape of the through hole 120a may be circular, square or elliptical in consideration of ease of assembly, but the present invention is not limited thereto.

Specifically, when the body portion 132 is rotated relative to the bottom plate 110 about the first center line CL1 by the second engaging portion 131, the eccentric portion 133 also rotates with the body portion 132 with the first center line CL1 as an axis. The separation distance between the optical film 120 and the bottom plate 110 needs to meet the technical requirements of the optical design of the backlight module 100. In the present embodiment, the perforations 120a are located at the near edge of the optical film 120. Before the partition pin 130 rotates relative to the bottom plate 110, The position of the through hole 120a corresponds to the eccentric portion 133. Therefore, when the eccentric portion 133 passes through the through hole 120a, when the eccentric portion 133 is rotated about the first center line CL1, a relative movement between the eccentric portion 133 and the through hole 120a occurs, so that the optical film 120 is tightened. In this way, while the separation distance between the optical film 120 and the bottom plate 110 can be maintained, the assembly process of the optical film 120 can also be easily accomplished by the rotation of the partition pin 130, that is, the optical film 120 is pre-assembled. Thereafter, the tightening operation is performed, and the method of assembling the optical film 120 after the optical film 120 is first tightened is different, so that the assembly failure can be effectively prevented. In addition, the partition pin 130 may be an integrally formed structure, but the present invention is not limited thereto.

Further, in order to strengthen the separation distance between the optical film 120 and the bottom plate 110, the partition pin 130 further includes a second abutting portion 135. The second abutting portion 135 is connected to the boundary between the body portion 132 and the second engaging portion 131 for abutting against the bottom plate 110.

As shown in FIGS. 1A to 2, the eccentric portion has a groove 133a1, the groove 133a1 is adjacent to the first abutting portion 134, and the optical film 120 is engaged with the groove 133a1. Therefore, the optical film 120 does not detach away from the first abutting portion 134 after being assembled to the partition pin 130.

Before the optical film 120 is assembled to the partition pin 130, that is, before the partition pin 130 is rotated relative to the bottom plate 110, the groove 133a1 substantially faces the center of the optical film 120. In the present embodiment, the eccentric portion 133 has a columnar shape, and the outer diameter D2 of the eccentric portion 133 is smaller than the diameter D1 of the through hole 120a. In this way, the process of the eccentric portion 133 passing through the through hole 120a can be easily performed.

Furthermore, the second center line CL2 of the eccentric portion 133 is located in the first Between the core line CL1 and the groove 133a1. That is, before the separation pin 130 is rotated relative to the bottom plate 110, the groove 133a1 faces the center of the optical film 120, and the optical film 120 does not engage with the groove 133a1. However, after the partition pin 130 is rotated relative to the bottom plate 110, that is, after the eccentric portion 133 is rotated with the main body portion 132 with the first center line CL1 as the axis, the groove 133a1 is rotated to a position away from the center of the optical film 120, so that the through hole 120a The position is pulled, and the optical film 120 is further tightened by the eccentric portion 133 and engaged with the groove 133a1.

Please refer to FIG. 3 , which is a partial cross-sectional side view of the backlight module 100 of FIG. 1A . As shown in FIGS. 1A to 1B and 3, the first engaging portion 111 is an oblong hole, and the second engaging portion 131 includes a shaft body 131a and two elastic arms 131b. The shaft body 131a is coupled to the body portion 132 and passes through the oblong hole. The elastic arm 131b is coupled to the shaft body 131a and extends to both sides of the shaft body 131a, and the elastic arm 131b is engaged with both ends of the oblong hole. In this way, before the partition pin 130 rotates relative to the bottom plate 110, the elastic arm 131b can be opened relative to the shaft body 131a along the long axis direction of the long circular hole, and is engaged with both ends of the oblong hole. In this case, since the elastic arm 131b is further opened due to the absence of a larger length space in the oblong hole, the elastic arm 131b can be in a stable state, and the partition pin 130 can also remain relatively rotatable with the bottom plate 110. When the user rotates the partition pin 130 relative to the bottom plate 110, the second engaging portion 131 rotates within the oblong hole. As the second engaging portion 131 rotates in the oblong hole, the elastic arm 131b is compressed in the direction of the shaft 131a, and the elastic arm 131b stores one bit until the elastic arm 131b rotates to the short axis of the long circular hole. . When the elastic arm 131b passes through the short axis of the oblong hole, the elastic arm The 131b will release the stored potential energy, and the elastic arm 131b can be opened relative to the shaft 131a until the elastic arm 131b is rotated again to the long axis of the oblong hole. At this time, since the elastic arm 131b is further opened due to the absence of a larger length space in the oblong hole, the elastic arm 131b can be in a stable state again. In other words, based on the action of the compression and opening of the elastic arm 131b, the partition pin 130 is rotated from the position before the rotation to the position after the rotation, and needs to be driven by an external force. If there is no external force applied by the user, the partition pin 130 does not reset itself to the position before the rotation after the rotation, so that the position of the partition pin 130 with respect to the bottom plate 110 is fixed.

Second embodiment

Please refer to pictures 4~6. FIG. 4 is a partial cross-sectional side view of the backlight module 200 according to the second embodiment of the present invention. FIG. 5 is a perspective view showing the partition pin 230 of the backlight module 200 of FIG. 4 . FIG. 6 is a perspective exploded view of the partition pin 230 of the backlight module 200 of FIG. 4. As shown in FIGS. 4-6, the backlight module 200 includes a bottom plate 210, an optical film 220, and a partition pin 230. The bottom plate 210 has a first engaging portion 211. The optical film 220 has a perforation 220a. The partition pin 230 includes a second engaging portion 231 , a body portion 232 , an eccentric portion 233 , and a first abutting portion 234 . The second connecting portion 231 is coupled to the first connecting portion 211 . The body portion 232 is connected to the second engaging portion 231 and has a first center line CL1. The eccentric portion 233 is detachably coupled to the body portion 232. The eccentric portion 233 is rotatable relative to the body portion 232 with the first center line CL1 as an axis, and has a second center line CL2 parallel to the first center line CL1, wherein the eccentric portion 233 passes through the through hole 220a and is engaged with the through hole 220a. The first abutting portion 234 is coupled to the body portion 232 and abuts the eccentric portion 233 and the optical film 220. Thereby supporting and clamping the optical film 220.

As shown in Figures 4 and 6, the body portion 232 includes a rotating post 232a. The rotating post 232a extends substantially along the first center line CL1. The eccentric portion 233 has a rotating hole 233d for the rotation of the rotating post 232a, and is in rotational engagement with the rotating post 232a, and the center of the rotating hole 233d is offset from the second center line CL2. More specifically, the eccentric portion 233 is rotatable relative to the body portion 232 about the first center line CL1. Therefore, by the eccentric portion 233 passing through the through hole 220a, the position of the through hole 220a is also pulled as the eccentric portion 233 is pivoted about the first center line CL1, so that the optical film 220 is tightened. As a result, the assembly process of the optical film 220 can be easily performed by the rotation of the eccentric portion 233, and the chance of assembly failure caused by the conventional assembly of the optical film 220 by hand is also avoided.

Please refer to FIG. 7 , which is a top view of the partition pin 230 of the backlight module 200 of FIG. 4 . In order to further guide the rotation of the eccentric portion 233 with respect to the body portion 232, as shown in FIGS. 5 to 7, the first abutting portion 234 has a locking groove 234a. The locking groove 234a extends circumferentially with the first center line CL1 as a center. The locking groove 234a has a first end 234a1 and a second end 234a2. The first center line CL1 is located between the first end 234a1 and the second end 234a2. The eccentric portion 233 includes a rotating cap 233a and a locking arm 233b. The rotating cap 233a passes through the through hole 220a and is engaged with the through hole 220a. The locking arm 233b is coupled to the rotating cap 233a and penetrates into the locking groove 234a. During the rotation of the eccentric portion 233 relative to the body portion 232, the locking arm 233b slides between the two ends of the locking groove 234a.

Further, as shown in Figures 5-7, the width of the locking groove 234a is The degree B is gradually decreased from the first end 234a1 toward the second end 234a2, and the locking groove 234a is in close fitting with the locking arm 233b adjacent to the inner wall W of the second end 234a2. In other words, when the locking arm 233b slides from the first end 234a1 toward the second end 234a2, that is, when the eccentric portion 233 is rotated to tighten the optical film 220, the locking arm 233b and the inner wall W adjacent to the second end 234a2 Tight fit. In this way, when the locking arm 233b reaches the second end 234a2, the locking arm 233b is tightly engaged by the inner wall W without being easily disengaged from the second end 234a2, so that the eccentric portion 233 is rotated to tighten the optical film. After 220 will not be loose.

As shown in FIGS. 4 and 6 to 7, the eccentric portion 233 further includes an engaging head 233c. The locking arm 233b is connected between the rotating cap 233a and the engaging head 233c and passes through the locking groove 234a. Moreover, the outer diameter D3 of the engaging head 233c is larger than the width B of the locking groove 234a, so that the engaging head 233c cannot pass through the locking groove 234a. As a result, since the engaging head 233c cannot pass through the locking groove 234a, the eccentric portion 233 does not come out in a direction away from the first abutting portion 234.

In summary, the second embodiment is different from the first embodiment in that the partition pin 230 of the second embodiment is of a separate structure, that is, the eccentric portion 233 and the body portion 232 are relatively rotatable, and the second engaging portion 231 is not The first engaging portion 211 is rotatably engaged, and since the main portion 232 is connected to the second engaging portion 231, the main body portion 232 does not rotate relative to the bottom plate 210. That is, the eccentric portion 233 is rotatable relative to the bottom plate 210.

As for other related structural and operational details, since they are all the same as the first embodiment, the description thereof will not be repeated.

Third embodiment

Please refer to pictures 8~9. Figure 8 shows the third real in accordance with this creation. A partial cross-sectional side view of the backlight module 300 of the embodiment. FIG. 9 is a perspective exploded view of the partition pin 330 of the backlight module 300 of FIG. 8. As shown in FIGS. 8 to 9, the body portion 332 of the partition pin 330 includes a rotation hole 332a. The rotating hole 332a extends substantially along the first center line CL1, and the eccentric portion 333 has the rotating post 333d inserted into the rotating hole 332a and is rotationally engaged with the rotating hole 332a, and the axis of the rotating post 333d is offset from the second center line CL2. That is, the eccentric portion 333 is rotated about the first center line CL1. Therefore, by the eccentric portion 333 passing through the through hole 320a, the through hole 320a is also pulled as the eccentric portion 333 is rotated about the first center line CL1, so that the optical film 320 is tightened. As a result, the assembly process of the optical film 320 can be easily accomplished by the rotation of the eccentric portion 333, and the chance of assembly failure caused by the conventional assembly of the optical film 320 by hand is avoided.

In summary, the third embodiment is different from the second embodiment in that the body portion 332 of the third embodiment includes a rotation hole 332a, and the eccentric portion 333 has a rotation column 333d.

As for other related structural and operational details, since they are all the same as the second embodiment, the description thereof will not be repeated.

In summary, the technical solution of the present invention has obvious advantages and beneficial effects compared with the prior art. Through the above technical solutions, considerable technological progress can be achieved, and the industrial use value is widely utilized, which has at least the following advantages:

(1) Since the eccentric portion has a second center line, and the second center line is parallel to the first center line. Therefore, when the body portion is rotated relative to the bottom plate by the second connecting portion around the first center line, the eccentric portion is also centered on the first center line. The body rotates. Therefore, when the eccentric portion passes through the through hole, when the eccentric portion is rotated about the first center line, a relative movement between the eccentric portion and the through hole is generated, so that the optical film is tightened. In this way, the separation distance between the optical film and the bottom plate can be maintained, and the assembly process of the optical film can also be simply completed by the rotation of the separation pin, that is, the optical film is pre-assembled and then pulled. The tightening action is different from the conventional method of tightening the optical film and then assembling it, so that the assembly failure can be effectively avoided.

(2) Since the eccentric portion has a columnar shape and the outer diameter of the eccentric portion is smaller than the diameter of the perforation, the process of the eccentric portion passing through the perforation can be easily performed.

(3) The elastic arm can be opened relative to the shaft body along the long axis direction of the long circular hole, and is engaged with both ends of the long round hole. In this case, since the elastic arm is further opened due to the absence of a larger length space in the oblong hole, the elastic arm can be in a stable state. In this way, if there is no external force applied by the user, the partition pin does not reset to the position before the rotation after the rotation, so that the position of the partition pin relative to the bottom plate is fixed.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Backlight module

110‧‧‧floor

111‧‧‧First Connection

120‧‧‧Optical diaphragm

120a‧‧‧Perforation

130‧‧‧Separate pin

131‧‧‧Second Linkage

131a‧‧‧Axis

131b‧‧‧Flexible arm

132‧‧‧ Body Department

133‧‧‧Eccentric

133a1‧‧‧ trench

134‧‧‧First Abutment

135‧‧‧second abutment

CL1‧‧‧ first centerline

CL2‧‧‧ second centerline

D1‧‧‧ aperture

D2‧‧‧ OD

Claims (16)

A backlight module includes: a bottom plate having a first connecting portion; an optical film having a through hole; and a dividing pin comprising: a second connecting portion rotatably coupled to the first connecting portion a body portion connecting the second connecting portion and having a first center line, wherein the body portion is rotatable relative to the bottom plate by the second connecting portion with the first center line as an axis; an eccentric portion, Connecting the body portion and having a second center line parallel to the first center line, wherein the eccentric portion passes through the through hole and is engaged with the through hole; and a first abutting portion is coupled to the body portion and The interface of the eccentric portion abuts against the optical film to support and hold the optical film. The backlight module of claim 1, wherein the eccentric portion has a groove, the groove abuts the first abutting portion, and the optical film is engaged with the groove. The backlight module of claim 1, wherein the eccentric portion has a groove, the groove abuts the first abutting portion, and the second center line is located between the first center line and the groove. The backlight module of claim 1, wherein the partition pin further comprises a second abutting portion connected to the boundary between the body portion and the second connecting portion for abutting Base plate. The backlight module of claim 1, wherein the first connecting portion is an oblong hole, the second engaging portion comprises: a shaft body connecting the body portion and passing through the oblong hole; and two elastic arms connecting The shaft body extends to both sides of the shaft body, and the elastic arms are engaged at both ends of the oblong hole. The backlight module of claim 1, wherein the eccentric portion is columnar, and an outer diameter of the eccentric portion is smaller than an aperture of the perforation. A backlight module includes: a bottom plate having a first connecting portion; an optical film having a through hole; and a dividing pin comprising: a second connecting portion for engaging the first connecting portion; and a body portion Connecting the second connecting portion and having a first center line; an eccentric portion detachably connecting the body portion, wherein the eccentric portion is rotatable relative to the body portion with the first center line as an axis, and has a first a second centerline parallel to the first centerline, wherein the eccentric passes through The perforation is engaged with the perforation; and a first abutting portion is coupled to the body portion and abuts the eccentric portion and the optical film to support and clamp the optical film. The backlight module of claim 7, wherein the body portion comprises a rotating column, the rotating column extends substantially along the first center line, the eccentric portion has a rotating hole for the rotating column to be inserted, and The rotating column is in a rotational fit, and a center of the rotating hole is offset from the second center line. The backlight module of claim 7, wherein the body portion includes a rotating hole extending substantially along the first center line, the eccentric portion having a rotating column inserted into the rotating hole, and rotating The hole is in a rotational fit and an axis of the rotating column is offset from the second centerline. The backlight module of claim 8 or 9, wherein the first abutting portion has a locking groove, and the locking groove extends circumferentially with the first center line as a center, the locking groove has a first One end and a second end, the first center line is located between the first end and the second end, the eccentric portion includes: a rotating cap passing through the through hole and engaging with the through hole; and a lock The fixing arm is connected to the rotating cap and penetrates into the locking groove, wherein the locking arm slides between the two ends of the locking groove during the rotation of the eccentric portion relative to the body portion. The backlight module of claim 10, wherein the locking slot is wide The first end is tapered toward the second end, and the locking groove is in tight engagement with the locking arm adjacent an inner wall of the second end. The backlight module of claim 11, wherein the eccentric portion further comprises an engaging head, the locking arm is connected between the rotating cap and the engaging head, and passes through the locking slot, and the card An outer diameter of the closure is greater than the width of the locking groove. The backlight module of claim 10, wherein the eccentric portion has a groove located at the rotating cap and adjacent to the first abutting portion, and the optical film is engaged with the groove. The backlight module of claim 13, wherein the second center line is located between the first center line and the trench. The backlight module of claim 10, wherein the rotating cap has a column shape, and an outer diameter of the rotating cap is smaller than an aperture of the through hole. The backlight module of claim 7, wherein the partition pin further comprises a second abutting portion, the second abutting portion is connected to the boundary between the body portion and the second connecting portion for abutting Base plate.