TWI410715B - Backlight module and plastic frame structure thereof - Google Patents

Abstract

A plastic frame structure for positioning a light guide plate and a black frame is described. The plastic frame structure includes two first frames and two second frames to support four edge angles of the light guide plate. Wherein the first frame is combined with the black frame by a first position element and a first combination element, and the second frame is combined with the black frame by second position elements. A backlight module is also disclosed.

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.

With the rapid advancement and evolution of display technology, traditional cathode ray tubes (CRTs) have been gradually eliminated due to problems such as poor space utilization and large energy consumption. They are replaced by light, thin, short and small. Liquid crystal display (LCD). Because liquid crystal displays have the advantages of high display quality, low energy consumption, and no radiation, LCD displays are widely used in notebook computers, computer screens, mobile phones, personal digital assistants (PDAs), digital cameras, and digital devices. Among the communication, information or consumer electronics such as cameras and LCD TVs.

The liquid crystal display can be mainly composed of two parts, a backlight module and a liquid crystal panel, and the main function of the backlight module is to provide a uniform surface light source to the liquid crystal panel. The backlight module is mainly composed of a light guide plate, a lamp tube and a plastic frame. Wherein, the light guide plate has a light incident surface, and the light tube is disposed beside the light incident surface, and the light projected by the light tube is incident into the light guide plate through the light incident surface, and is scattered and reflected to be emitted from the light guide plate, and further, the plastic frame The utility model is characterized in that the light guide plate and the lamp tube are carried and fixed on the back plate, so that the surface light source emitted from the light exit surface can be irradiated to the liquid crystal panel disposed above the plastic frame.

However, the conventional plastic frame is a shape formed by integral molding. Since the plastic frame is fixed in size and has no common elasticity, it cannot be applied to products of other sizes. Furthermore, different sizes of products need to be opened with different molds. The production of the appropriate plastic frame, resulting in high cost of mold opening and material costs. Therefore, how to change the structure of the plastic frame to make it applicable to products of various sizes, thereby reducing the manufacturing cost and material cost of the backlight module, is an inventor of the case and a technical field in the related industry. Question.

In view of the above, the present invention provides a plastic frame structure for positioning a light guide plate and a back plate. The light guide plate includes four end angles and a light entrance side, and the light entrance side is located between the two end angles. The plastic frame structure includes: a first frame, which is located at two end angles of the light-incident side of the light guide plate, each of the first frames includes: a first frame body; and a first support member connected to the first frame body for supporting the light guide plate; a positioning member is disposed on the first frame for combining the back plate; and the first coupling member is located at the first frame for combining the back plate; and the second frame is located at the other two end corners of the light guide plate Each of the second frames includes: a second frame; a second support member coupled to the second frame for supporting the light guide plate; and a plurality of second positioning members located at the second frame for engaging the back plate.

The present invention also provides a backlight module, comprising: a backboard, comprising a plurality of first positioning pieces and a plurality of second positioning pieces; the light guiding plate is located in the backing plate, and includes four end angles and a light entering side, and the light entering side is located at two Between the two corners; two first frames are located at two end angles of the light-incident side of the light guide plate, each of the first frames comprises: a first frame; and the first support member is connected to the first frame. The first positioning member is disposed on the first frame, and is coupled to one of the first positioning pieces of the back plate; and the first connecting member is located in the first frame, and is coupled to one of the back plates The second positioning piece; and the two second frames are located at the other two end angles of the light guide plate, each of the second frames includes: a second frame body; and the second support member is connected to the second frame body for supporting The light guide plate; and the plurality of second positioning members are located in the second frame and are coupled to the first positioning piece of the back plate.

The invention changes the plastic frame structure into a four-piece design, and replaces the conventional one-piece mouth-shaped type plastic frame with four L-shaped corner plastic frames (the first frame and the second frame), which can be applied not only to various types The backlight module of different sizes can save the cost of mold opening by actively miniaturizing the plastic frame body, and the required material is minimized, thereby effectively saving the material cost of the plastic frame, thereby reducing the plastic frame. The purpose of the mold and finished product costs.

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.

FIGS. 1 , 2 , 3A, 3B, 3C, 4A, and 4B illustrate the backlight module of the present invention.

The backlight module 1 includes a back plate 2, a light guide plate 4, two first frames 6, and two second frames 8.

The back plate 2 has a rectangular hollow body, preferably made of a metal material, or a plastic material or other suitable material. Here, the back plate 2 is respectively provided with a plurality of first positioning pieces 21 on three frames connected in a rectangle, and a plurality of second positioning pieces 22 are disposed on the other frame.

The light guide plate 4 is disposed in the back plate 2, has a parallelogram shape and has four end angles 41, 42, 43, 44, and has a light incident side 4a and a light exiting surface 4b, and the light incident side 4a is located in two of the phases. Between the adjacent end angles 41 and 42, in the present embodiment, the light-emitting surface 4b of the light guide plate 4 is intersectable on the light-incident side 4a, and the light source device 90 is disposed on the light-incident side 4a (as shown in Figs. 1 and 13). Figure shows).

The two first frames 6 are located at two end angles 41 and 42 at the two ends of the light-incident side 4a of the light guide plate 4. Each of the first frames 6 can be mainly composed of the first frame 61, the first support member 62, and the first positioning member 64. And the first connecting member 66 is formed by the first connecting member 612, and the first connecting member 612 is substantially perpendicular to the first resisting member 611 and The first frame member 61 is connected to the first frame body 61 so as to be substantially L-shaped; the first support member 62 is connected to the first frame body 61 for supporting the light guide plate 4, where the first support is The member 62 is connected to the first resisting member 611 and the first connecting member 612 at the same time and is generally L-shaped (as shown in FIG. 3A ), or may be connected only to the first resisting member 611 of the first housing 61 . Or the first connecting member 612 is a font type; the first positioning member 64 is located on the first frame 61, preferably disposed on the first resisting member 611, and is used for one of the backing plates 2 The first positioning piece 21 is coupled to the first frame body 61, and is preferably disposed on the first connecting piece 612 for a second positioning piece 22 of the backing plate 2. Combined.

In this embodiment, the first frame body 61 can be provided with a first through hole 614 on the first resisting member 611, and the first positioning member 64 can preferably be composed of a plurality of first guiding portions 641, wherein The first guiding portion 641 is preferably opposite, and the length of one of the first guiding portions 641 is longer than the length of the other first guiding portion 641; further, the first guiding portion 641 having a longer length has the first guiding portion 641 a hook portion 644, and the first hook portion 644 is preferably tapered toward the other first guiding portion 641 to form a guiding slope 645, and the other first guiding portion 641 is also provided with a guiding slope 645 corresponds to the guiding surface 646 (as shown in Figures 8 and 9). Furthermore, the first frame body 61 can be provided with a first through hole 616 on the first connecting member 612. The first connecting member 66 can preferably be composed of two stopping portions 661, and the two stopping portions 661 are located at the first position. The two ends of the perforations 616, and the stop portion 661 preferably may be tapered toward the other stop portion 661 to form a beveled surface 662.

The two second frames 8 are located at the two end corners 43, 44 of the light guide plate 4, and each of the second frames 8 is mainly composed of a second frame body 81, a second support member 82 and a second positioning member 84; The second frame 81 is composed of the second abutting member 811 and the second connecting member 812, and the second connecting member 812 is substantially perpendicular to the second abutting member 811 and connected to the second abutting member 811, so that the second frame The body 81 is generally viewed as an L-shaped font; the second support member 82 is coupled to the second frame 81 for supporting the light guide plate 4, wherein the second support member 82 is simultaneously connected to the second resist member 811 and The second connector 812 is generally of the L font type (as shown in FIG. 4A ), or may be connected to only the second resist 811 or the second connector 812 of the second frame 81 to form a two-font type. The second positioning member 84 is disposed on the second frame body 81, and is preferably disposed on the second abutting member 811 and the second connecting member 812 for combining with the second positioning piece 21 of the backboard 2.

In this embodiment, the second frame 81 can be provided with a second through hole 814 on the second resisting member 811, and the second positioning member 84 can preferably be composed of a plurality of second guiding portions 841, wherein The second guiding portion 841 is preferably opposite, and the length of one of the second guiding portions 841 is longer than the length of the other two guiding portions 841; further, the second guiding portion 841 having a longer length has The second hook portion 844 is preferably formed to be tapered toward the other second guiding portion 841 to form a guiding slope 845, and the other second guiding portion 841 is also provided and guided. The inclined surface 845 corresponds to the guiding surface 846 (as shown in Figures 11 and 12).

Referring to FIG. 13, the light source device 90 is disposed on the light incident side 4a of the light guide plate 4. The other three sides of the light guide plate 4 are between the two first frames 6 and the back plate 2, and two A reflector 91 is disposed between the second frame 8 and the back plate 2 for reflecting the light projected by the light source device 90, thereby improving the brightness of the backlight module 1.

Referring to FIG. 5 to FIG. 12, the first support member 62 of the two first frames 6 supports the two end angles 41 and 42 of the two ends of the light-incident side 4a of the light guide plate 4 at the time of assembly. The second support members 82 of the second frames 8 support the two end angles 43, 44 of the light guide plate 4 (as shown in Fig. 1). When the first frame 6 is placed in the backing plate 2, the first positioning piece 21 of the backing plate 2 is first displaced along the guiding inclined surface 645 of the longer length of the first guiding portion 641, and then along the other first guiding The guiding surface 646 of the guiding portion 641 is displaced and inserted into the first through hole 614, and after the first positioning piece 21 is embedded in the first through hole 614, the first positioning piece 21 is stopped by the first hook portion 644 to avoid the first positioning piece. 21 is disengaged from the first through hole 614; the two ends of the second positioning piece 22 of the back plate 2 are respectively displaced along the guiding slope 662 of the two stopping portions 661 to be embedded in the first through hole 616, and in the second positioning piece 22 After the first through hole 616 is inserted, the second positioning piece 22 is stopped by the stopping portion 661 to prevent the second positioning piece 22 from coming out of the first through hole 616; the first positioning portion 641 of the first guiding portion 641 stops the first positioning. The piece 21 and the stopping portion 661 stop the second positioning piece 22 for the purpose of positioning the first frame 6 and the back plate 2. When the second frame 8 is placed in the backboard 2, the first positioning piece 21 of the backboard 2 is first displaced along the guiding slope 845 of the second guiding portion 841 having a longer length, and then along the other second guiding The guiding surface 846 of the guiding portion 841 is displaced and inserted into the second through hole 814, and after the first positioning piece 21 is inserted into the second through hole 814, the first positioning piece 21 is stopped by the second hook portion 844 to avoid the first positioning piece. 21 is disengaged from the second through hole 814; the second frame 8 and the back plate 2 are positioned by a plurality of second positioning members 84.

The invention adopts a four-piece design of four L-shaped corner plastic frames (first frame, second frame) instead of the conventional one-piece mouth-shaped type plastic frame, so the invention can be applied to various sizes. The backlight module effectively solves the problem that a product needs to open a mold of a plastic frame. Furthermore, the four-piece design of the plastic frame structure of the invention can effectively reduce the volume of the plastic frame, and the plastic frame body is actively reduced. The utility model can save the cost of mold opening, and the required material is minimized, and the material cost of the plastic frame can be effectively saved, thereby achieving the purpose of reducing the cost of the mold and the finished product of the plastic frame.

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

2. . . Backplane

twenty one. . . First positioning piece

twenty two. . . Second positioning piece

4. . . Light guide

4a. . . Light side

4b. . . Glossy surface

41, 42, 43, 44. . . End angle

6. . . First frame

61. . . First frame

611. . . First resist

612. . . First connector

614. . . First through hole

616. . . First perforation

62. . . First support

64. . . First positioning member

641. . . First guide

644. . . First hook

645. . . Guided slope

646. . . Guide surface

66. . . First joint

661. . . Stop

662. . . Bevel

8. . . Second frame

81. . . Second frame

811. . . Second resist

812. . . Second connector

814. . . Second through hole

82. . . Second support

84. . . Second positioning member

841. . . Second guiding portion

844. . . Second hook

845. . . Guided slope

846. . . Guide surface

90. . . Light source device

91. . . Reflective sheet

FIG. 1 is a schematic view of a backlight module of the present invention.

Figure 2 is a schematic view of the plastic frame structure of the present invention.

Figure 3A is a schematic view of the first frame of the present invention.

Figure 3B is a schematic diagram of Figure 3A in section A.

Figure 3C is a schematic diagram of Figure 3A in Part B.

Figure 4A is a schematic view of the second frame of the present invention.

Fig. 4B is a partially enlarged schematic view of Fig. 4A.

FIG. 5 is a schematic view (1) of the first frame and the back plate of the first positioning member of the present invention.

Figure 6 is a schematic view (2) of the first positioning member combining the first frame and the back plate according to the present invention.

Figure 7 is a schematic cross-sectional view of Figure 6.

Figure 8 is a schematic view (2) of the first assembly and the back plate of the first joint member of the present invention.

Figure 9 is a schematic cross-sectional view of Figure 8.

Figure 10 is a schematic view (1) of the second frame and the back plate of the second positioning member of the present invention.

Figure 11 is a schematic view (2) of the second positioning member combining the second frame and the back plate according to the present invention.

Figure 12 is a schematic cross-sectional view of Figure 11.

Figure 13 is a schematic view showing the addition of a retroreflective sheeting of the present invention.

6‧‧‧ first frame

61‧‧‧ first frame

611‧‧‧First Responsible

612‧‧‧First connector

614‧‧‧ first through hole

62‧‧‧First support

64‧‧‧First positioning piece

66‧‧‧First joint

8‧‧‧ second framework

81‧‧‧ second frame

811‧‧‧second resist

821‧‧‧Second connector

814‧‧‧Second through hole

82‧‧‧second support

84‧‧‧Second positioning parts

Claims (23)

A plastic frame structure for positioning a light guide plate and a back plate, the light guide plate comprising four end angles and a light entrance side, wherein the light incident side is located between the two end angles, the plastic frame structure comprises: a first frame, two end angles of the two ends of the light-incident side of the light guide plate, each of the first frames includes: a first frame; a first support member coupled to the first frame, The first positioning member is located at the first frame for coupling the back plate; and a first coupling member is located at the first frame for coupling the back plate; The second frame is located at the other two corners of the light guide plate, and each of the second frames comprises: a second frame; a second support member connected to the second frame for supporting the guide And a plurality of second positioning members located on the second frame for combining the back plates. The frame structure of claim 1, wherein the first frame comprises a first abutting member and a first connecting member, the first connecting member is substantially perpendicular to the first abutting member and connects the first abutting member Hold the piece. The frame structure of claim 2, wherein the first positioning member is located at the first abutting member. The frame structure of claim 2, wherein the first bonding member is located at the first connector. The frame structure of claim 1, wherein the first frame comprises a first through hole, and the first positioning member comprises a plurality of first guiding portions facing each other, and sequentially guiding the first positioning of the back plate The sheet is embedded in the first through hole. The frame structure of claim 5, wherein the first positioning member further comprises a first hook portion located at one of the first guiding portions, and the first positioning portion is inserted into the through hole to stop the first positioning sheet. The frame structure of claim 5, wherein one of the first guiding portions has a length longer than the other of the first guiding portions. The framing frame structure of claim 1, wherein the first frame comprises a first through hole, and the first connecting member comprises two stopping portions at two ends of the first through hole, and the stopping portions simultaneously guide the A second positioning piece of the back plate is embedded in the through hole, and stops the second positioning piece from coming out of the through hole. The frame structure of claim 1, wherein the second frame comprises a plurality of second through holes, each of the second positioning members comprises a plurality of second guiding portions facing each other, and sequentially guiding the one of the back plates A positioning piece is embedded in the second through hole. The frame structure of claim 9, wherein the second positioning member further comprises a second hook portion located at one of the second guiding portions, and the first positioning piece is inserted into the through hole to stop the first positioning sheet. The frame structure of claim 9, wherein one of the second guiding portions has a length longer than the other of the second guiding portions. A backlight module includes: a backplane including a plurality of first positioning pieces and a plurality of second positioning pieces; a light guiding plate located in the backing plate, comprising four end angles and a light entering side, wherein the light entering side is located Between the two end angles; two first frames are located at the two ends of the light-incident side of the light guide plate, and each of the first frames comprises: a first frame; a first support member The first frame is connected to the first frame, and the first frame is disposed on the first frame, and is coupled to one of the first positioning pieces of the back plate; and a first connecting member. The first frame is coupled to one of the second positioning pieces of the backboard; and the second frame is located at the other two end corners of the light guide plate, and each of the second frames includes: a second frame is connected to the second frame for supporting the light guide plate; and a plurality of second positioning members are located on the second frame, and the first positions are coupled to the back plate sheet. The backlight module of claim 12, wherein the first frame comprises a first resisting member and a first connecting member, the first connecting member is substantially perpendicular to the first resisting member and connected to the first abutting member Hold the piece. The backlight module of claim 13, wherein the first positioning member is located at the first resisting member. The backlight module of claim 13, wherein the first bonding member is located at the first connecting member. The backlight module of claim 12, wherein the first frame comprises a first through hole, and the first positioning member comprises a plurality of first guiding portions facing each other, and the first positioning of the back plate is sequentially guided The sheet is embedded in the first through hole. The backlight module of claim 16, wherein the first positioning member further comprises a first hook portion located at one of the first guiding portions, and the first positioning portion is inserted into the through hole to stop the first positioning sheet. The backlight module of claim 16, wherein one of the first guiding portions has a length longer than the other of the first guiding portions. The backlight module of claim 12, wherein the first frame comprises a first through hole, and the first connecting member comprises two stopping portions at two ends of the first through hole, and the stopping portions simultaneously guide the The second positioning piece of the back plate is embedded in the through hole, and stops the second positioning piece from coming out of the through hole. The backlight module of claim 12, wherein the second frame comprises a plurality of second through holes, each of the second positioning members includes a plurality of second guiding portions facing each other, and sequentially guiding the back plate A positioning piece is embedded in the second through hole. The backlight module of claim 20, wherein the second positioning member further comprises a second hook portion located at one of the second guiding portions, and the first positioning piece is inserted into the through hole to stop the first positioning sheet. The backlight module of claim 20, wherein one of the second guiding portions has a length longer than the other of the second guiding portions. The backlight module of claim 12, further comprising: a plurality of reflective sheets located between the first frame and the back plate, the second frames and the back plate.