TWI494645B - Backlight module and plastic frame structure thereof - Google Patents

Description

Backlight module and its plastic frame structure

The invention relates to a fixed structure, in particular to a backlight module and a plastic frame structure thereof.

The optical film is usually provided with a plurality of positioning holes, and the optical film is positioned on the positioning post of the plastic frame with the positioning holes to position the optical film. However, the optical film is formed by cutting the positioning holes to produce a burr at the periphery of the positioning hole. Moreover, when the optical film is composed of a plurality of layers, the burrs of the positioning holes are also multi-layered so that the burrs of the positioning holes become synapses of the surface of the optical film.

Therefore, when the optical film is positioned, the burr of the positioning hole will cause a gap between the optical film and the positioning post, and the synapse formed by the burr of the positioning hole will cause the surface of the backlight module to be uneven or locally raised. And so on. Herein, the optical film may not be positioned due to factors such as burrs, voids, or sliding, and may even cause problems such as Newton's ring phenomenon.

Moreover, in order to meet the demand for thinning of technology products, the design of the height of the positioning column has become shorter and shorter. However, if the processing accuracy of the periphery of the positioning hole is severe, the processing cycle is prolonged and the processing cost is also increased.

Therefore, how to propose a flat positioning of the optical film in the backlight module is one of the most urgent problems to be solved.

The invention proposes a plastic frame structure for positioning an optical component. The optical component comprises a light guide plate and an optical film, and the optical film is laminated on the light guide plate, and the optical film comprises a positioning hole and a burr portion located at a periphery of the positioning hole. The plastic frame structure comprises: the body portion includes a bearing surface; the resisting portion is coupled to the body portion, and the resisting portion is configured to abut the optical component; the positioning post is located on the bearing surface, and the positioning post is disposed against the positioning hole of the optical film, and the positioning column The height is greater than or equal to the thickness of the optical film; the positioning recess is located on the bearing surface and adjacent to the positioning post, and the positioning recess is for receiving the burr.

The invention provides a backlight module comprising an optical component comprising a light guide plate and an optical film, wherein the optical film is laminated on the light guide plate, and the optical film comprises a positioning hole and a burr portion located at a periphery of the positioning hole. The plastic frame structure comprises: the body portion includes a bearing surface; the resisting portion is coupled to the body portion, and the resisting portion is configured to abut the optical component; the positioning post is located on the bearing surface, and the positioning post is used for the positioning hole of the optical film, and positioning The height of the column is greater than or equal to the thickness of the optical film; the positioning recess is located on the bearing surface and adjacent to the positioning post, and the positioning recess is for receiving the burr.

In the embodiment of the present invention, the optical component is positioned by the plastic frame structure, and the positioning hole is engaged with the positioning post to fix the light guide plate and the optical film. Moreover, the plastic frame structure has a positioning recess to receive the burr of the periphery of the positioning hole, so that the optical film is positioned flat in the backlight module.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art.

FIG. 1A is a cross-sectional view showing a backlight module and a plastic frame structure thereof according to the present invention. FIG. 1B and FIG. 1C are exploded views of a backlight module and a plastic frame structure thereof according to an embodiment of the present invention, wherein FIG. 1C is a view showing the plastic frame structure 10 located in the backlight module 1 and is omitted. Optical assembly 20. 2A and 2B are schematic views of a backlight module and a plastic frame structure thereof according to an embodiment of the present invention.

Referring to FIG. 1A, FIG. 1B, FIG. 1C, FIG. 2A and FIG. 2B, the backlight module 1 is mainly composed of an optical component 20, a plastic frame structure 10 and a frame 40, wherein the plastic frame structure 10 is used for positioning. Optical assembly 20.

The optical component 20 is mainly composed of a light guide plate 21 and an optical film 22, and the optical film 22 is laminated on the light guide plate 21. The optical film 22 has a positioning hole 221 and a burr portion 222 located at a periphery of the positioning hole 221 .

The plastic frame structure 10 has an elongated structure and can be mainly composed of the main body portion 11 , the abutting portion 12 , the positioning post 13 and the positioning concave portion 14 . The body portion 11 has a bearing surface 111; the abutting portion 12 is coupled to the body portion 11 and the abutting portion 12 is configured to abut the optical component 20; the positioning post 13 is located on the bearing surface 111, and the positioning post 13 rests against the optical film 22 The positioning hole 221 and the height of the positioning post 13 are greater than or equal to the thickness of the optical film 22; the positioning recess 14 is located on the bearing surface 111 and adjacent to the positioning post 13 , and the positioning recess 14 is used to receive the burr portion 222 .

The optical film 22 includes a base portion 22a and an extension portion 22b. The base portion 22a is laminated on the light guide plate 21. The extending portion 22b is connected to the base portion 22a and is provided with a positioning hole 221. herein, The portion of the optical film 22 corresponding to the light guide plate 21 is the base portion 22a, and the portion of the optical film 22 corresponding to the gap 30 and the body portion 11 is the extension portion 22b. In other words, the optical film 22 is located on the light guide plate 21, the gap 30, and the body portion 11. The optical film 22 has a first surface 223 and a second surface 224. The burr root portion 222a of the burr portion 222 at the periphery of the positioning hole 221 protrudes from the first surface 223. Moreover, the optical film 22 is closely attached to the light guide plate 21 and the bearing surface 111 by the first surface 223, and is aligned with the positioning post 13 by the positioning hole 221, so that the positioning post 13 is embedded in the positioning hole 221.

Here, when the optical component 20 is positioned by the plastic frame structure 10, the resisting portion 12 holds the light guide plate 21 and exposes the second surface 224 of the optical film 22 and the top surface 12a of the resisting portion 12. Moreover, the positioning post 13 of the plastic frame structure 10 is embedded in the positioning hole 221 of the optical film 22, and the positioning recess 14 receives the burr portion 222 of the periphery of the positioning hole 221. When the positioning hole 221 is fitted to the positioning post 13, the light guide plate 21 and the optical film 22 are fixed. Thereby, the frame structure 10 positions the optical component 20.

In some embodiments, the positioning hole 221 of the positioning post 13 leaning against the extending portion 22b can pass through the positioning hole 221 of the positioning post 13 so that the circumference of the positioning post 13 leans against the edge of the positioning hole 221 to fix the positioning post 13 In the positioning hole 221 (as shown in FIG. 2A).

Alternatively, the positioning post 13 can lean against the positioning hole 221, and the positioning hole 221 can hold the positioning post 13 at a portion of the edge, and the positioning post 13 can be fixed in the positioning hole 221 (as shown in FIG. 2B). Here, the optical film 22 abuts the abutting portion 12, the positioning post 13, and the inner wall 41 of the frame 40 with the edge of the extending portion 22b.

In some embodiments, optical film 22 can be composed of a multilayer film. Here, this is For example, the optical film 22 is exemplified by three layers, but is not limited thereto. The number of optical films 22 can be varied as needed.

The manner and the number of the positioning holes 221 on the extending portion 22b are not limited, and may be changed according to actual needs. The shape of the positioning hole 221 and the positioning post 13 are matched with each other, and may be circular, elliptical, square, or the like.

The gap 30 can be used to insert a light source module (not shown). The light emitted from the light source module is incident on the light guide plate 21 through the light incident surface of the light guide plate 21.

The positioning recess 14 is a groove having a predetermined depth, wherein the positioning recess 14 can be disposed on the bearing surface 111 and adjacent to the positioning post 13 or on the bearing surface 111 of the positioning post 13 .

The positioning recess 14 is not limited. For example, in some embodiments, the positioning recess 14 can be injection molded to reduce the processing cost, or is formed by milling, so that the positioning recess 14 can be milled according to requirements. For different types.

3A to 3C are views showing a state of a plastic frame structure according to an embodiment of the present invention.

The horizontally extending line of the bearing surface 111 (shown by the dashed lines in FIGS. 3A-3C) is perpendicular to the positioning post 13, and the positioning recess 14 is an open space below the horizontally extending line. The height difference between the bottom portion 14a of the positioning recess 14 and the horizontally extending line of the bearing surface 111 is the depth D1 of the positioning recess 14.

In some embodiments, the depth D1 of the positioning recess 14 is between 0.095 mm and 0.155 mm. The description of the depth D1 of the positioning recess 14 is only an example, and the invention is not limited thereto, and can be adjusted according to actual needs.

Referring to FIGS. 3A and 3B, one end portion 14b of the positioning recess 14 is adjacent to the bottom portion 14a, and the other end portion 14c is adjacent to the bearing surface 111, and the end portion 14c of the end portion 14b is a side wall 14d of the positioning recess portion 14. Thereby, the bottom portion 14a of the positioning recess 14 is adjacent to the positioning post 13 and the side wall 14d.

As shown in FIG. 3A, the positioning recess 14 may be chamfered in depth from one end portion 14b of the positioning post 13 toward the other end portion 14c, and the angle formed by the bottom portion 14a and the side wall 14d is an obtuse angle. Alternatively, as shown in FIG. 3B, the bottom portion 14a of the positioning recess 14 and the side wall 14d may be nearly vertical, and the positioning recess 14 is approximately rectangular. Further, as shown in Fig. 3C, the bottom portion 14a and the side wall 14d are connected to each other as a concave surface.

In some embodiments, the bottom portion 14a of the positioning recess 14 and the side wall 14d can be nearly perpendicular, the positioning recess 14 can be approximately rectangular, and when the frame structure 10 is disposed in the frame 40, the bottom portion 14a of the positioning recess 14 and the frame 40 The inner wall 41 is adjacent (as shown in FIG. 1C), and the positioning recess 14 is a rectangular receiving space.

4A to 4C are perspective views of the positioning post and the positioning recess of the plastic frame structure according to the embodiment of the present invention.

In some embodiments, the positioning recess 14 can be an annular or polygonal receiving space, and the end portion 14c of the positioning recess 14 abuts the bearing surface 111, that is, a part of the edge (upper edge) of the side wall 14d of the positioning recess 14 is The bearing surface 111 is joined.

As shown in FIG. 4A, the positioning recess 14 surrounds the periphery of the positioning post 13; as shown in FIG. 4B, the positioning recess 14 is located at the periphery of the positioning post 13 and is a rectangular receiving space. Here, the bottom 14a of the positioning recess 14 is provided. Adjacent to the positioning post 13 and the side wall 14d, and the upper edge of the side wall 14d of the positioning recess 14 is engaged with the bearing surface 111 to make the positioning concave The portion 14 is located between the positioning post 13 and the bearing surface 111.

As shown in FIG. 4C, the positioning recess 14 is a plurality of accommodating units, and the accommodating units are disposed on the bearing surface 111 of the positioning post 13, but are not joined to the positioning post 13, and the positioning recess 14 is partially surrounded. The pillars 13 are positioned and spaced apart from the periphery of the positioning pillars 13.

Fig. 5 is a schematic view showing the implementation of a plastic frame structure according to an embodiment of the present invention. Here, the optical film 22 is three layers, but the invention is not limited thereto.

Referring to FIG. 5 , the optical film 22 is adjacent to the light guide plate 21 and the bearing surface 111 with the first surface 223 , and the positioning post 13 passes through the positioning hole 221 . Here, the positioning recess 14 receives the burr portion 222 protruding from the first surface 223, and the burr root portion 222a is located at the bottom portion 14a of the positioning recess portion 14.

In some embodiments, the depth D1 of the positioning recess 14 is between 0.5 and 1 times the thickness D2 of the optical film 22, and thus, the positioning recess 14 can accommodate the burr portion 222. However, the present invention is not limited thereto, and can be adjusted according to actual needs.

Here, the height of the positioning post 13 is preferably approximately equal to the thickness of the optical film 22, and the second surface 224 and the top 131 of the positioning post 13 are planar. Alternatively, when the height of the positioning post 13 is greater than the thickness of the optical film 22, the top portion 131 of the positioning post 13 protrudes from the second surface 224.

In the embodiment of the present invention, the optical component is positioned by the plastic frame structure, and the positioning hole is engaged with the positioning post to fix the light guide plate and the optical film. Moreover, the positioning recess of the plastic frame structure accommodates the burr of the periphery of the positioning hole to enable the optical film to be positioned flat in the backlight module.

Although the technical content of the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any modifications and refinements made by those skilled in the art without departing from the spirit of the present invention are encompassed by the present invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

1‧‧‧Backlight module

10‧‧‧Glass frame structure

11‧‧‧ Body Department

111‧‧‧ bearing surface

12‧‧‧Resistance Department

12a‧‧‧Top

13‧‧‧Positioning column

131‧‧‧ top

14‧‧‧ positioning recess

14a‧‧‧ bottom

14b‧‧‧End

14c‧‧‧End

14d‧‧‧ side wall

20‧‧‧Optical components

21‧‧‧Light guide

22‧‧‧Optical diaphragm

22a‧‧‧ base

22b‧‧‧Extension

221‧‧‧Positioning holes

222‧‧‧Mask

222a‧‧‧The root of the burr

223‧‧‧ first surface

224‧‧‧ second surface

30‧‧‧ gap

40‧‧‧Frame

41‧‧‧ inner wall

FIG. 1A is a cross-sectional view showing a backlight module and a plastic frame structure thereof according to an embodiment of the present invention.

FIG. 1B is an exploded view of a backlight module and a plastic frame structure thereof according to an embodiment of the present invention.

FIG. 1C is an exploded view of a backlight module and a plastic frame structure thereof according to another embodiment of the present invention.

FIG. 2A is a schematic diagram of a backlight module and a plastic frame structure thereof according to an embodiment of the present invention.

FIG. 2B is a schematic diagram of a backlight module and a plastic frame structure thereof according to another embodiment of the present invention.

Fig. 3A is a view showing a state of a plastic frame structure according to an embodiment of the present invention.

FIG. 3B is a view showing a state of a plastic frame structure according to an embodiment of the present invention.

FIG. 3C is a view showing a state of a plastic frame structure according to an embodiment of the present invention.

4A is a perspective view (1) of a positioning post and a positioning recess of the plastic frame structure according to an embodiment of the present invention.

FIG. 4B is a perspective view (2) of the positioning post and the positioning recess of the plastic frame structure according to an embodiment of the present invention.

4C is a perspective view (3) of the positioning post and the positioning recess of the plastic frame structure according to an embodiment of the present invention.

FIG. 5 is a schematic view showing the implementation of a plastic frame structure according to an embodiment of the present invention.

1‧‧‧Backlight module

10‧‧‧Glass frame structure

11‧‧‧ Body Department

111‧‧‧ bearing surface

12‧‧‧Resistance Department

12a‧‧‧Top

13‧‧‧Positioning column

131‧‧‧ top

14‧‧‧ positioning recess

20‧‧‧Optical components

21‧‧‧Light guide

22‧‧‧Optical diaphragm

22a‧‧‧ base

22b‧‧‧Extension

221‧‧‧Positioning holes

222‧‧‧Mask

223‧‧‧ first surface

224‧‧‧ second surface

30‧‧‧ gap

40‧‧‧Front frame

41‧‧‧ inner wall

Claims (17)

A plastic frame assembly for positioning an optical component, the optical component comprising a light guide plate and at least one optical film laminated on the light guide plate, comprising a positioning hole and a burr portion located at a periphery of the positioning hole The plastic frame structure comprises: a body portion including a bearing surface; a resisting portion connected to the body portion for resisting the optical component; and a positioning post on the bearing surface for leaning against the optical film The positioning hole has a height greater than or equal to a thickness of the optical film; and a positioning recess formed on the bearing surface of the body portion and adjacent to the positioning post for receiving the burr portion. The frame structure of claim 1, wherein the positioning recess is a groove having a predetermined depth. The frame structure according to claim 1, wherein the positioning recess is chamfered in a depth decreasing from one end to the other end of the positioning post. The frame structure of claim 1, wherein the positioning recess is located at a periphery of the positioning post. The frame structure of claim 1, wherein the positioning recess is a polygonal receiving space. The frame structure of claim 1, wherein the positioning recess is a plurality of accommodating units, and the accommodating units partially surround the positioning post. The frame structure of claim 1, wherein the depth of the positioning recess is between 0.5 and 1 times the thickness of the optical film. The frame structure of claim 7, wherein the positioning recess has a depth of between 0.095 mm and 0.155 mm. The frame structure of claim 1, wherein the positioning post passes through the positioning hole of the optical film. A backlight module comprising: an optical component comprising a light guide plate; and at least one optical film laminated on the light guide plate, comprising a positioning hole and a burr portion located at a periphery of the positioning hole; and a plastic frame structure The method includes a body portion including a bearing surface, a resisting portion connected to the body portion for resisting the optical component, and a positioning post on the bearing surface for leaning against the positioning hole of the optical film. The height of the positioning post is greater than or equal to the thickness of the optical film; and a positioning recess is formed on the bearing surface of the body portion and adjacent to the positioning post for receiving the burr portion. The backlight module of claim 10, wherein the optical film further comprises a base portion and an extension portion, the base portion is laminated on the light guide plate, and the extension portion is connected to the base portion and is provided with the positioning hole. The backlight module of claim 10, wherein the positioning recess is chamfered in a decreasing depth from one end of the positioning post toward the other end. The backlight module of claim 10, wherein the positioning recess is a groove having a predetermined depth. The backlight module of claim 10, wherein the positioning recess is located at a periphery of the positioning post. The backlight module of claim 10, wherein the depth of the positioning recess is between 0.5 and 1 times the thickness of the optical film. The backlight module of claim 15, wherein the positioning recess has a depth of between 0.095 mm and 0.155 mm. The backlight module of claim 10, wherein the positioning post passes through the positioning hole of the optical film.