TW201122657A - Backlight module and assembling method thereof and display device using the same - Google Patents

Abstract

A backlight module including at least an optical film, a frame, at least one first and at least one second pins and an assembling method of the module are provided. The optical film has at least one first and at least one second through holes. The first and the second pins are disposed on an upper surface of the frame and are respectively adjacent to a first and a second sides of the frame that are opposite to each other. The first and the second pins respectively have a first projecting section facing the second side and a second one facing the first side. The method includes the steps of providing the optical film and the frame, bending two opposite sides of the optical film, passing the pins through the through holes, and restoring the optical film to a flat state to fix the optical film on the upper surface.

Description

[Technical Field] The present invention relates to a backlight module, a combination method thereof, and a display device therefor, and more particularly to a backlight module for fixing an optical film by using a plastic frame The combined method and display device using the same. [Prior Art] With the active investment and research and development of the industry, electronic products for LCD devices are popularized, such as mobile phones, personal digital assistants, notebook computers, digital cameras, computer screens, and flat-panel TVs. Generally, a liquid crystal display device is mainly composed of a display panel and a backlight module, and the backlight module is mainly composed of a plastic frame, an optical film, and a light source assembly. The optical film includes, for example, a light guide plate, a brightness enhancement film, and a light diffusion sheet. Among various electronic products to which a liquid crystal display device is applied, in particular, a backlight module used in a notebook computer. In the manner in which the optical film is fixed to the frame, the optical film is usually fixed to the frame by a tape. However, the use of adhesive patches, in addition to its own cost of production, is also a very labor intensive process, which adds to the cost of production. Therefore, under the constant low-cost market competitiveness, how to reduce production costs and save process time to increase production efficiency to make products more competitive and competitive is the goal of the industry's research and development. [Description of the Invention] 201122657 1 w^zum 1 · The present invention relates to a combination of a backlight module and a display device and a backlight module and an optical film, which are disposed on the upper surface of the plastic frame of the backlight module. There is at least one first cylinder and at least one second cylinder, so that the optical film can be directly fixed to the plastic frame simply and quickly. In this way, not only can the process cost be reduced, but also the process time can be saved. The invention provides a backlight module comprising at least one optical film, a plastic frame, at least one first cylinder and at least one second cylinder. The optically appealing diaphragm has at least one first perforation and at least one second perforation. The frame has an upper surface. The first cylinder and the second cylinder are disposed on the upper surface of the plastic frame and adjacent to a first side and a second side of the plastic frame. The first cylinder has a first neck section and a first projection section. The second cylinder has a second neck section and a second projection section. The first raised section is oriented toward the first side and the first raised section is oriented toward the first side. The first column and the second column are respectively passed through the first through hole and the second through hole, so that the first neck portion and the second neck portion respectively contact the sidewalls of the first through hole and the second through hole to The optical film is fixed on the upper surface of the plastic frame. The present invention further provides a combination method of a backlight module, which comprises the following steps. First, an optical film is provided. The optical film has at least one first perforation and at least one second perforation. Next, a plastic frame is provided. One of the upper surfaces of the plastic frame is provided with at least one first cylinder and at least one second cylinder. Then, the opposite sides of the optical film are bent. Next, the first cylinder is passed through the first perforation and the second cylinder is passed through the second perforation. Thereafter, the optical film m is reorganized (four) so that the wire film @ is disposed on the upper surface of the frame.

* I 201122657 * »» Τ-ΤΑ-ν* The present invention further proposes a combination method of a backlight module which comprises the following steps. The first S, provides a silk film. The optical film has at least one perforation to J/, a first tangent, at least one second perforation, and at least one first line. The slits at both ends of the first line are respectively located on the side of the first perforation and the optical film adjacent to the first perforation. The slits at both ends of the second tangent are respectively located on the side of the second perforation and the optical film adjacent to the second perforation. Next, a plastic frame is provided. One of the upper surfaces of the plastic frame is provided with at least one first cylinder and at least one second cylinder. Then, the opposite side of the optical film is bent. Next, the first cylinder is moved into the first perforation via the first tangent and the second cylinder is moved into the second perforation via the second tangent. Thereafter, the optical film is restored to a flat state such that the optical film is fixed to the upper surface of the knee frame. The invention further provides a display device comprising a display panel and a backlight module. The backlight module is disposed on one side of the display panel. The backlight module includes at least one optical film, a plastic frame, at least one first cylinder, and at least one second cylinder. The optical film has at least one first perforation and at least one second perforation. The plastic frame has an upper surface. The first cylinder and the second cylinder are disposed on the upper surface of the plastic frame and adjacent to a first side and a second side of the plastic frame, respectively. The first cylinder has a first neck section and a first projection section. The second cylinder has a second neck section and a second protrusion section. The first raised section is toward the second side and the second raised section is toward the first side. The first cylinder and the second cylinder are respectively passed through the first through hole and the second through hole, so that the first neck portion and the second neck portion respectively contact the sidewalls of the first through hole and the second through hole to optically The diaphragm is fixed on the upper surface of the plastic frame. In order to make the above-mentioned contents of the present invention more obvious and easy to understand, the following is a detailed description of the preferred embodiment of the present invention, and the following is a detailed description of the following embodiments: [Embodiment] In the present invention In the first and second embodiments, at least one first cylinder and at least one second cylinder are disposed on the upper surface of the plastic frame, so that the optical film is fixed to the plastic frame simply and quickly. Each of the cylinders has a neck section and a projection section. The optical film has a plurality of perforations corresponding to the cylinders. When the optical film is fixed on the plastic frame, the optical film is slightly bent to pass the perforations on the plastic frame through the perforations of the optical film, and then the optical film is restored to be flat, so that the columns are respectively card-carded. Combined with perforation. In the backlight module, the neck portion of the cylinder blocks the movement of the optical film in the horizontal direction, and the protruding portion of the column blocks the movement of the optical film in the vertical direction, so that the optical film is fixed. On the upper surface of the plastic frame. The first and second embodiments of the present invention will be described below in conjunction with the drawings. However, the steps of the perforation and the shape of the cylinder, the position and the combination of the optical film and the plastic frame proposed in these embodiments are for illustrative purposes only, and are not intended to be implemented by those skilled in the art, and are not The scope of the invention to be protected is limited. Further, the illustrations in the embodiments also omit unnecessary elements to clearly show the technical features of the present invention. First Embodiment A backlight module according to a first embodiment of the present invention includes at least a plastic frame, at least one first cylinder, at least one second cylinder, and at least one optical film. In the following detailed description of the embodiment, the backlight module is exemplified by two first pillars, two second pillars, and two optical films. Referring to FIG. 1, a schematic diagram of a backlight module in accordance with a first embodiment of the present invention is shown. In this embodiment, the backlight module 100 includes a plastic frame 110, two first pillars 121 and 122, two second pillars 131 and 132, and two optical films 140 and 150. The first cylinders 121 and 122 and the second cylinders 131 and 132 are disposed on the upper surface u〇a of the plastic frame 110. The first cylinders 121 and 122 are adjacent to one of the first sides U1 of the frame π〇. The second cylinders 131 and 132 are adjacent to the second side 112 of one of the plastic frames 110. The second side 112 is the opposite side of the first side lu. Moreover, in this embodiment, the first side U1 and the second side 112 are long sides of the plastic frame ιι. The first cylinder 121 and the second cylinder are located on the short side 113 of the plastic frame. The first cylinder 122 and the second cylinder 132 are located on the other short side 114 of the plastic frame 110. Referring to Figure 2, which shows a top view of the optical film, the optical film 140 has two first through holes U1a, uib and two second through holes 142a, 142b. The through holes 141a, 141b, 142a and 142b are respectively disposed corresponding to the pillars 121, 122, and 13b. Although the optical film 15〇' is not illustrated in FIG. 2, the optical film 15 is preferably combined with the optical film 140. In the embodiment, the optical film sheets 14〇, 15〇 can be respectively a light guide plate, a light diffusion sheet or a light film. In the figure and the second figure, the first cylinder 121 has a first neck slave 121a and a first protruding section 121b. The first neck section 121& passes through the first through hole 141a. The first protruding section 121b faces the first The two sides 112 (which are one long side of the plastic frame 110) protrude from the first neck section ma in the direction of the short side 201122657 Π3 of the parallel frame 11〇. The other first cylinder (2) (as indicated in Fig. 1) is the same as the first cylinder 121, and a neck portion and a first protruding portion are not repeated. The second cylinder 122 The first neck section passes through the other first perforation, and the first protrusion 122 is oriented toward the second side 112 and along the other short side 114 of the parallel capsule 110. Projecting from the first neck section of the other second cylinder 122. The second cylinder 131 has a second neck section 131a and a second protruding section 158. The second neck section 131a passes through the second section The second protruding portion 131b is oriented toward the first side edge lu (which is the other long side of the plastic frame 11〇) and the direction of the short side edge 113 of the /13 parallel plastic frame 110 protrudes from the neck Section 131a. The other-second cylinder 132 (as indicated in Fig.!) is the same as the second cylinder 131, and has a second neck section and a second protrusion section, which are not repeated. The second neck portion of the two cylinders 132 passes through the other second through hole 142b, and the second protruding portion of the second column 132 faces the first side 111, and the other along the parallel plastic frame 11 The direction of the short side 114 is convex The second film segment of the second column 132. The optical film 14〇, 150 of the embodiment can be respectively engaged with the first column 121 and 122 and the second column 131 and 132 respectively. The through holes 141a and 141b and the second through holes 142a and 142b are closely engaged with the upper surface 〇a of the frame 110. In addition, please refer to FIG. 3, which illustrates the backlight module of FIG. A cross-sectional view of 3-3 is preferred because the first projection 121b of the first cylinder 121 of the present embodiment is preferably symmetrical with the second projection 131b of the second cylinder 131. In this embodiment, the first perforation and the second perforation 201122657,

• I 1 ▼▼ The distance d2 of the corresponding inner side of the 142a is greater than the distance d3 of the opposite side of the first protruding section 121b and the second protruding section 131b, so that the optical diaphragms 140, 150 are moved in the vertical direction z. It is blocked by the first protruding section 121b and the second protruding section 131b. The distance d2 is the shortest distance between the first through hole 141a and the second through hole 142a along the X direction, and the distance d3 is the shortest distance between the first protruding portion 121b and the second protruding portion 131b along the X direction. . The distance d2 is substantially equal to the distance d1 between the first neck section 121a and the opposite side of the second neck section 131a, such that movement of the optical diaphragms 140, 150 in the horizontal directions X and y can be affected by the first neck section 121a and Blocking of the second neck segment 131a. The distance d1 is the shortest distance between the first neck section 121a and the second neck section 131a along the X direction. However, the technical content of the present invention is not limited to the foregoing embodiments, for example, the distance d2 of the first through hole 141a to the second through hole 142a may be smaller than the distance dl of the first neck segment 121a to the second neck segment 131a and greater than The distance d3 is such that the optical films 140 and 150 have a buffering space when they are disposed on the plastic frame 110, and the optical films 140 and 150 are prevented from being warped when they are fixed on the plastic frame 110. In a preferred embodiment, the first cylinders 121 and 122 and the second cylinders 131 and 132 are integrally formed with the plastic frame 110, and the first cylinders 12 and 122 and the second cylinders 131 and 132 are formed. Inverted L shape. Furthermore, the first through holes 141a, 141b and the second through holes 142a, 142b are the same size as the first protruding portion 121b and the second protruding portion 131b. In different embodiments, the backlight module can also be designed for the dimensional tolerance value between the cylinder and the perforation to meet the requirements of the process. For example, the width of the first perforations 141a, 141b is at most greater than the thickness of the first neck segment 201122657 » * 121a 122a. 2mm; the width of the second perforations 142a, 142b is at most greater than the width of the second neck segments 131a, 132a The thickness is 0.2mm. The distance from the first f 121a, 122a to the second neck segments 131a, 132a is greater than the distance from the first through-holes 41a, 141b to the second perforations 142a, 142b. 2, for example, the distance dl is at most greater than the distance d2 About 0. 2mm, the technical content of the present invention is not limited to the aforementioned numerical values. The widths of the upper perforations 141a, 14b, the second perforations 142a, 142b and the thicknesses of the necks 12a, 122a and the second neck sections 131a, 132a refer to dimensions perpendicular to the direction of the paper. The backlight module 1GQ may further include a lateral light-input type as shown in FIG. 1 . The source component (10)' is disposed on the second side of the plastic frame, and is configured to provide light to the optical film 140. 150. However, the intra-Valley of the present invention is not limited to the aforementioned light source assembly 160, and may be other light-integrated light source components, such as a direct-light or corner-in-light source assembly. φ The backlight module of this embodiment can be applied to a display device. Refer to Section 4® for an exploded view showing the cracking of the back domain 纟a in Figure 1. The display device 10 includes a backlight module 100, a display panel 200, and an upper cover 300. The backlight module 1 is disposed on the lower side of the display panel 200 for providing a light source to the display panel to display an image. The upper cover 300 is used for bonding to the backlight module 1 and the display surface to complete the assembly of the display device 100. On the other hand, the following is a description of a combination method of the backlight module of the present embodiment. Please refer to FIG. 5A to FIG. 5C at the same time, which respectively illustrate the steps of the steps of the combination method of the embodiment. The method of the method includes the following steps. First, at least one optical film and a frame 110 are provided as shown in Fig. 5A. In the combined method of this embodiment, an optical film is provided as an example. The optical film 140 has at least one first through hole 141a and at least a second through hole 142a. The surface of the plastic frame 11〇 is configured with at least ~

The ctL is a cylinder 121 and at least a second cylinder 131.

Then, as shown in FIG. 5B, the opposite short sides 113 and 114 of the optical film 140 are bent such that the linear distance d2' of the first through hole 141a to the second through hole 142 is substantially equal to the first protruding portion. The distance d3 from i21b to the second protruding section 131b. Next, the first cylinder 121 is passed through the first through hole 141a' and the second cylinder 131 is passed through the second through hole 142a. In the present embodiment, in order to avoid the problem that the optical film 140 is permanently deformed due to the excessive bending length, the short side of the optical film 140 is bent.

Thereafter, as shown in Fig. 5C, the optical film 14 is restored to a flat state, so that the optical film 140 is fixed to the upper surface u〇a of the frame 110. As a result, the movement of the optical film 140 in a horizontal direction X is blocked by the first neck portion 121a and the second neck portion 131a, and the movement of the optical film 14 〇 along a vertical direction z is subjected to the first convex The out segment 121b and the second protruding segment 131b are blocked. In accordance with the spirit of the present invention, in addition to the structure of the backlight module 1 of Fig. 1, the position and number of the columns and the perforations can be designed. For example, please refer to FIG. 6 and FIG. 7. FIG. 6 is a top view of a backlight module having different pillars and perforation configurations, and FIG. 7 is an enlarged schematic view of a region 7' in FIG. The backlight module 6 includes a plastic frame 610, two first cylinders 62, 622, two second cylinders 631, 12, 201122657 i w^Hfzum, * 632, an optical film 640, and a light source assembly 660. Although the structure of the backlight module 600 and the backlight module 100 are slightly different, the backlight module 600 of FIG. 6 can also be optically bent in the manner of bending the optical film 640 according to the combination method of the backlight module disclosed above. The through holes 641a, 641b, 642a, and 642b of the diaphragm 640 are respectively engaged with the first cylinders 621, 622 and the second cylinders 63A, 632 to fix the optical die 640 on the plastic frame 610. In addition, please refer to Figure 8 and Figure 9. Figure 8 shows a top view of a backlight module with different columns and perforation configurations. Figure 9 shows the area 9 in Figure 8. A magnified view of the. The backlight module 800 includes a bezel 810, three first cylinders 82, 822, 823, two second cylinders 831, 832, an optical film 840, and a light source assembly 860. The first cylinders 821, 822, and 823 are disposed along the first side 811, and the second cylinders 831, 832 are disposed along the second side 812. In the eighth and ninth drawings, the backlight module 600 can also make the perforations 841a, 841b, and 841c of the optical film 840 in the manner of bending the optical film 840 ® according to the combination method of the backlight module disclosed above. The 842a and the 842b are respectively engaged with the first cylinders 821, 822, and 823 and the second cylinders 831 and 832 to fix the optical die 840 on the plastic frame 810. According to a second embodiment of the present invention, in a backlight module of the second embodiment of the present invention, a plastic frame, a first column and a second column system disposed thereon, and the above-mentioned plastic frame 110 according to the first embodiment of the present invention, The pillars 121 and 122 and the second pillars 131 and 132 are arranged in the same manner as shown in Fig. 1, and the following is not described in detail. Referring to Figure 10, there is shown a top plan view of an optical film in accordance with a second embodiment of the present invention. In the present embodiment, the optical film 1040 has two first through holes 1041a, 1041b and two second through holes 1042a, 1042b. The perforations 1041a, 1041b, 1042a, 1042b of the optical film 1040 are disposed corresponding to the cylinders 121, 122, 131, 132, respectively. The optical film 1040 of this embodiment further has two first tangent lines 1043a, 1043b and two second tangent lines 1044a, 1044b. The slits at both ends of the first line 1043a, 1043b are respectively located on the sides of the first through holes 1041a, 1041b and the optical film 1040 adjacent to the first through holes 1041a, 1041b. The slits at the two ends of the second tangential lines 1044a, 1044b are respectively located on the other side of the second perforations 1042a, 1042b and the optical film 1040 adjacent to the second perforations 104a, 1042b. Please refer to FIGS. 11 to 14 at the same time. 11 is a schematic view showing a bending step of an optical film of the combination method of the embodiment. FIG. 12 is a side view showing the optical film of FIG. 11 when it is bent, and FIG. 13 is a view showing the embodiment. FIG. 14 is a schematic view showing the optical film recovery and flattening step of the combination method of the present embodiment. FIG. 14 is a schematic view showing the optical film recovery step of the combination method of the present embodiment. According to the combination method of the backlight module of the second embodiment of the present invention, the optical film 1040 and the plastic frame 11 are first provided. Then, the opposite sides of the optical film are bent such that the first tangent 1〇43a, 1〇43b (the first tangent 1043b is shown in the first figure) to the second tangent 1〇444a, 1044b (the first The linear distance (ie, the distance in the X-axis direction) of the second tangent lines 1044a and 1044b is substantially equal to the first cylinder 121 to the second cylinder 131 (the first cylinder 121 and the second cylinder)丨31 is shown in Figure 1) 201122657

The linear distance of I WHWIW I » forms a curved optical film 1040 as shown in Figs. 11 and 12. Next, as indicated by the eleventh icon, along the arrow direction of the y-axis, the first cylinder 121 is moved into the first perforation 1041a via the first tangent line 104a, as shown in FIG. Further, for example, in an external force manner, the optical film 1〇40 of the second drawing is pushed in the direction of the first cylinder 121, so that the first cylinder 121 presses the first tangent line 104a into the first perforation. Within 1041a. The second cylinder 131 is also moved into the second perforation 1042a via the second tangent 104a, and the description thereof will not be repeated. Thereafter, as shown in the 13th icon, the optical film 1040 is restored to a flat state along the arrow direction of the X-axis. For example, after the curved optical film 1040 is released, the optical film 1040 is restored to the flat state as shown in Fig. 14. Thus, the optical film 1040 is fixed to the upper surface ii 〇 a of the plastic frame uo. In practical applications, in addition to the above design methods, the position and number of cylinders and perforations can be adjusted according to the design requirements of the actual product. That is, the number and arrangement positions of the cylinders and the perforations are not limited by the above embodiments. For example, the number of the first cylinders and the second cylinders may be individually. The backlight module disclosed in the above embodiment is configured such that at least one first cylinder and at least one second body are disposed on the upper surface of the plastic frame, and the pillars are preferably integrally formed with the plastic frame. The optical film is simply and quickly attached to the frame. In addition, in the combination method of the backlight module, the optical film is only slightly bent, and the carcass on the plastic frame is respectively engaged with the optical film perforation, and then the optical film is restored to be flat, and the optical film can be removed. The piece is fixed on the plastic frame. In this way, not only can the process cost be reduced, but also the process time can be saved. In summary, although the present invention has been disclosed above by way of a preferred embodiment, 15 201122657 is a more complete one. Those skilled in the art and having ordinary knowledge will be able to make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a backlight module according to a first embodiment of the present invention. Fig. 2 is a plan view showing the optical film in Fig. 1. Figure 3 shows the backlight module of Figure i along section line 3_3,

Surface map. D Fig. 4 is a view showing an exploded view of a display device using the backlight module of Fig. i. 5A-5C are schematic views respectively showing respective steps of the combination method of the first embodiment. Figure 6 is a plan view of a backlight module having different pillars and perforation configurations. Fig. 7 is an enlarged schematic view showing a region 7 in Fig. 6. Figure 8 is a plan view showing another backlight module having different columns and perforation configurations. Fig. 9 is an enlarged schematic view showing a region 9 in Fig. 8. Figure 10 is a plan view showing an optical film in accordance with a second embodiment of the present invention. Fig. 11 is a view showing the optical film bending step of the combination method of the second embodiment. 201122657

TW4WA Fig. 12 is a side view showing the optical film of Fig. 11 when it is bent. Fig. 13 is a view showing the steps of bonding the optical film to the cylinder of the combination method of the second embodiment. Fig. 14 is a view showing the steps of the recovery process of the optical film of the combination method of the second embodiment. [Main component symbol description] 10: Display device® 100, 600, 800: backlight module 110, 610, 810: plastic frame 110a: plastic frame upper surface 111, 611, 811: first side 112, 612, 812: Second side 113, 114, 613, 614, 813, 814: short side 12 122, 621, 622, 821, 822, 823: first cylinder 121a, 621a, 821a: first neck section ® 121b , 621b, 821b: first protruding section 13 132, 63 632, 83 832: second cylinder 131a, 631a, 831a: second neck section 131b, 631b, 831b: second protruding section 140, 150, 640, 840: optical films 141a, 141b, 641a, 64b1, 84la, 841b, 841c, 1041a, 1041b: first perforations 142a, 142b, 642a, 642b, 842a, 842b, 1042a, 1042b: second perforations 17 201122657 l TV TT^.V/1 r\ 160, 660, 860 200: display panel 300: upper cover 1043a, 1043b: 1044a, 1044b: dl, d2, d2', : the first tangent of the light source assembly, the second tangent d3: distance

Claims (1)

201122657 1 w^Hzum I 1 VII. Patent application scope: 1. A backlight module comprising: at least one optical film having at least one first through hole and at least one second through hole; a plastic frame having an upper surface; And the at least one first cylinder and the at least one second cylinder are disposed on the upper surface and adjacent to the opposite first side and the second side of the plastic frame, the first cylinder has a first a neck portion and a first protruding portion, the second column has a second neck portion and a second protruding portion, the first protruding portion facing the second side, the second The protruding portion is oriented toward the first side; wherein the first and second columns are respectively passed through the first through hole and the second through hole to make the first neck portion and the second portion The neck segments are respectively in contact with the sidewalls of the first through hole and the second through hole to fix the at least one optical film to the upper surface. 2. The backlight module of claim 1, wherein the plastic frame has two opposite sides and two opposite sides, and the first side and the second side are a second long side, the first protruding portion protrudes substantially in a direction parallel to the short side from the first neck portion, and the second protruding portion protrudes substantially in a direction parallel to the short side The second neck segment. 3. The backlight module of claim 2, wherein the optical film has two first through holes and two second through holes, the backlight module includes two first columns and two The second cylinders are respectively located on the two short sides, and the two second cylinders are respectively located at 201122657 < »T Λ~\ (. The two short sides. 4. The backlight module of claim 1, wherein the distance from the first through hole to the second through hole is greater than the distance from the first protruding portion to the second protruding portion, the first through hole to the second through hole The distance between the first neck portion and the second neck portion is less than the distance from the first neck portion to the second neck portion. 5. The backlight module of claim 1 wherein the first cylinder and the second cylinder are substantially inverted. The backlight module of claim 1, wherein the first through hole and the second through hole are substantially the same size as the first protruding portion and the second protruding portion, respectively. The backlight module of claim 2, wherein the width of the first perforation is at most The thickness of the neck portion is greater than 2 mm. The width of the second perforation is at most 2 mm greater than the thickness of the second neck portion. The backlight module of claim 1, wherein the distance from the first neck segment to the second neck segment is at most 0 2 mm greater than the distance from the first through hole to the second through hole. The backlight module of the first aspect of the invention, wherein the first column body and the second column system are integrally formed with the plastic frame. The backlight module of claim 1, further comprising a light source component. The light source module is configured to provide light to the optical film. The backlight module of the invention, wherein the optical film comprises a light guide plate, a light diffusion sheet or a brightness enhancement film. The backlight module of claim 1, wherein the optical film further has at least a first tangent line and at least a second tangent line, the first tangent line, wherein: 20 201122657 1 WHHZUr/\ The slits at both ends are respectively located in the first through hole and the optical film Adjacent to the side of the first through hole, the slits at the two ends of the second tangent are respectively located on the side of the second through hole and the optical film adjacent to the second through hole. The method includes: providing an optical film having at least one first through hole and at least one second through hole; • providing a plastic frame, wherein one of the upper surfaces of the plastic frame is provided with at least one first column and at least one a second cylinder; bending opposite sides of the optical film; passing the first cylinder through the first through hole, and passing the second cylinder through the second through hole; and restoring the optical film to a flat state, wherein the optical film is fixed to the upper surface. 15. The combination method according to claim 14, wherein: in the step of providing the plastic frame, the first cylinder and the The second cylinders are respectively adjacent to a first side and a second side of the plastic frame, the first cylinder has a first neck portion and a first protruding portion, and the second cylinder Having a second neck section and a second protrusion section, the first protrusion section Facing the second side, the second protruding section is facing the first side, after the step of restoring the optical film to the flat state, the first neck section and the second neck section are Blocking movement of the optical film in a horizontal direction, the first protruding segment and the second protruding segment blocking movement of the optical film in a vertical direction. 21 201122657 I WHW/Λ 16. The combination method according to claim 15, wherein the frame has opposite sides and opposite sides, the first side, the second side and the second side The edge is the two long sides, and in the step of f-curving the optical film, the two short sides of the optical film are bent. 17. The combination method of claim 15, wherein in the step of providing the optical film, the first through-to-first penetration is greater than the first to second protrusions The distance from the first through hole to the second through hole is smaller than the distance from the first neck portion to the second neck portion, and the first perforation is made in the step of f bending the optical film The linear distance to the second perforation is equal to the linear distance from the first convex segment to the second convex segment. 18. A method of combining a backlight module, comprising: providing an optical film having at least one first through hole, at least a first tangent, at least one second through hole, and at least a second tangent line, The slits at the two ends of the first tangential line are respectively located on the side of the first through hole and the optical film adjacent to the first through hole, and the slits at the two ends of the second tangential line are respectively located adjacent to the second through hole and the optical film. Providing a plastic frame, the upper surface of the plastic frame is provided with at least one first cylinder and at least one second cylinder; bending opposite sides of the optical film; - the cylinder moves into the first perforation via the first tangential line, and moves the second cylinder into the second perforation via the second tangential line; and solidifies the optical film to a flat state, such that The optical film 22 201122657 X ΎΎ -ττ^, νι r\ , * is provided on the upper surface. 19. The combination method of claim 18, wherein in the step of providing the frame, the first column and the second column are respectively adjacent to a first side of the winning frame The first column has a first neck portion and a first protruding portion, and the second column has a second neck portion and a second protruding portion. a protruding section facing the second side, the second protruding section facing the first side, after the step of restoring the optical film to the flat state, the first neck segment and the The second neck section blocks the movement of the optical film in a horizontal direction, and the first protruding section and the second protruding section block the optical film from moving in a vertical direction. 20. The combination method according to claim 19, wherein in the step of providing the optical film, the distance from the first through hole to the second through hole is greater than the first protruding portion to the second convex portion a distance from the first through hole to the first through hole that is smaller than a distance from the first neck portion to the second neck portion, in the step of bending the optical film, the first The linear distance from the second perforation to the second perforation is substantially equal to the linear distance from the first tangent to the second tangent. 21. A display device comprising: a display panel; and a backlight module disposed on a side of the display panel, the backlight module comprising: 'at least one optical film having at least one first through hole and at least one second a plastic frame having an upper surface; and 23 201122657 at least one first cylinder and at least one second cylinder disposed on the upper surface and adjacent to a first side of the plastic frame and a first side a second side of the first column having a first neck portion and a first protruding portion, the second column having a second neck portion and a second protruding portion, the first protruding portion a segment facing the second side, the second protruding segment facing the first side; The first column and the second column are respectively passed through the first through hole and the second through hole, so that the first neck portion and the second neck portion respectively contact the first through hole and The second perforation (4) is to fix the at least one optical film to the upper surface. The display device according to claim 21, wherein the first column and the second column system are integrally formed with the plastic frame. The display device of claim 21, further comprising a light source assembly for providing a first line penetration through the display panel. 〃 The display device of claim 21, wherein the light guide plate comprises a light guide plate, a light diffusion plate or a brightness enhancement film. twenty four