TW201323991A - Backlight module - Google Patents

Abstract

The invention relates to a backlight module which includes a light-guiding plate, at least one light source, a housing and a frame. The light-guiding plate has at least one side surface, a top surface, a bottom surface and at least one fixing structure (for example, a hollow structure or a recess portion). The light source faces the side surface or the bottom surface. The housing is used for accommodating the light-guiding plate and the light source. The frame is disposed above the top surface of the light-guiding plate and has at least one first protrusion structure. The first protrusion structure extends to the fixing structure. Whereby, the manufacturing time and component cost can be reduced, the problems of cracking and heat-melting of light-guiding plate can be avoided, and the light-guiding plate can be held firmly.

Description

Backlight module

The invention relates to a backlight module, in particular to a backlight module with a protruding structure for positioning a light guide plate.

In the conventional edge-lit backlight module, the conventional light guide plate positioning design forms a plurality of grooves on the light guide plate, and punches a plurality of holes on the back plate and rives a plurality of positioning columns, and the positioning columns are The position is corresponding to the positions of the grooves, and the positioning of the light guide plate can be achieved when the positioning posts are inserted into the grooves.

The disadvantages of the conventional light guide plate positioning design described above are as follows. First, the holes need to be punched out on the back plate, and then the positioning posts are riveted. In this two-stage step, there will be a high process cost, and both the hole and the riveting will have process variability. When the process variability is not well controlled, the gap between the light source and the light guide plate may be too small. , which leads to the melting of the light guide plate after heating.

Therefore, it is necessary to provide an innovative and progressive backlight module to solve the above problems.

The invention provides a backlight module, which comprises a light guide plate, at least one light source, a back plate and a frame. The light guide plate has at least one side surface, a top surface, a bottom surface and at least one through structure, and the through structure penetrates from the top surface to the bottom surface. The light source faces the side or the bottom surface. The backboard is configured to receive the light guide plate and the light source. The frame is disposed above the top surface of the light guide plate and has at least one first protruding structure extending in the through structure.

The present invention further provides a backlight module including a light guide plate, at least one light source, a back plate, and a frame. The light guide plate has at least one side surface, a top surface, a bottom surface and at least one upper recess, and the upper recess is located on the top surface. The light source faces the side or the bottom surface. The backboard is configured to receive the light guide plate and the light source. The frame is disposed above the top surface of the light guide plate, and the frame has at least one first protruding structure extending into the upper recess.

Thereby, the present invention has the following advantages. The function of fixing the light guide plate can be achieved by the cooperation of the first protruding structure and the through structure/the upper recess, and no other components are needed, so the component cost can be reduced. In addition, the first protruding structure is extended from the frame, and the process cost is low. Furthermore, the present invention can maintain a spacing between the light source and the light guide plate to improve the problem that the positioning column causes the gap between the light source and the light guide plate to be too small when the stamping deformation of the back plate is too large, and the light guide plate melts after being heated. .

1 is a perspective exploded view of a first embodiment of a backlight module of the present invention; FIG. 2 is a plan view showing a combination of a first embodiment of the backlight module of the present invention; FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. Figure. Referring to FIG. 1 to FIG. 3 , the backlight module 1 includes a back plate 11 , a light guide plate 12 , at least one light source 13 , and a frame 14 .

In this embodiment, the backplane 11 includes a bottom plate 111 and four side walls 112. The side walls 112 are substantially perpendicularly connected to the bottom plate 111, so that the back plate 11 forms an accommodating space for accommodating the light guide plate 12 and the Light source 13. The light guide plate 12 has at least one side surface 121 , a top surface 122 , a bottom surface 123 , and at least one through structure 124 . The side surface 121 is a light incident surface, and the top surface 122 is a light emitting surface. The through structure 124 is penetrated by the top surface 122 to the bottom surface 123.

In this embodiment, the through structure 124 is consistently perforated, and the side surface 121 of the light guide plate 12 further has at least one protruding portion 125 , and the through structure 124 is located at the protruding portion 125 . The material of the light guide plate 12 may be polymethyl methacrylate (PMMA). The light guide plate 12 is disposed above the bottom plate 111 of the back plate 11 for uniformly guiding the light from the light source 13 to the top surface 122. Preferably, the top surface 122 of the light guide plate 12 is further provided with at least one optical film (not shown), such as a diffusion film, a polarizing film, a wide viewing angle film, a retardation film or a brightness enhancement film. A reflective sheet (not shown) is disposed under the bottom surface 123 of the light guide plate 12 for reflecting light back into the interior of the light guide plate 12.

The light source 13 faces the side 121 of the light guide plate 12. The light source 13 can be a light emitting diode (LED) or a cold cathode fluorescent tube (CCFL). In this embodiment, the light source 13 is an LED strip disposed between the sidewall 112 of the backplane 11 and the side 121 of the light guide panel 12. Preferably, the light source 13 is two LED strips, which are respectively located on two sides of the light guide plate 12. It can be understood that the light source 13 can also be disposed between the bottom plate 111 of the back plate 11 and the bottom surface 123 of the light guide plate 12. That is, the backlight module 1 of the present invention can be a side light backlight module or a straight down backlight module.

The frame 14 is disposed above the top surface 122 of the light guide plate 12 . In this embodiment, the frame 14 is a plastic frame having a rib 141 and at least one first protruding structure 142. The rib 141 is located at a position above the periphery of the top surface 122 of the light guide plate 12, and contacts the optical film or the top surface 122 to press the optical film or the light guide plate 12. In the embodiment, the rib 141 is an integrally formed ring plate, and the rib 141 is integrally formed with the first protruding structure 142. It can be understood that the rib 141 can also be a ring plate composed of a plurality of plates.

Referring to FIG. 3 , the first protruding structure 142 extends from the through structure 124 and is fixed in the through structure 124 . In this embodiment, a distance between a bottom surface of the first protruding structure 142 and a bottom surface 123 of the light guide plate 12 is provided. However, it can be understood that the first protruding structure 142 can also extend to the bottom surface 123 of the light guide plate 12, that is, the bottom surface of the first protruding structure 142 is flush with the bottom surface 123 of the light guide plate 12.

In this embodiment, the function of fixing the light guide plate 12 can be achieved by the cooperation of the first protruding structure 142 and the through structure 124. Since the first protruding structure 142 can be integrally formed on the frame 14 (for example, injection molding, press molding, etc.), it is easy to make a hole and then rive the joint, which is obviously much simpler in the process and less The cost of production, in addition, can also reduce the problem of process variability that is difficult to control due to excessive processes or parts. In addition, because the process variability of the present invention is more controllable, the gap between the light source 13 and the light guide plate 12 is further controlled, thereby reducing the fear that the light guide plate 12 melts after being heated.

4 is a perspective exploded view showing a second embodiment of the backlight module of the present invention; and FIG. 5 is a cross-sectional view showing the second embodiment of the backlight module of the present invention. The backlight module 2 of the present embodiment is substantially the same as the backlight module 1 (FIGS. 1 to 3) of the first embodiment, wherein the same components are given the same component symbols. The backlight module 2 of the present embodiment is different from the backlight module 1 (FIGS. 1 to 3) in that the bottom plate 111 of the backplane 11 of the backlight module 2 further has a plurality of holes 113, and the first The protruding structure 142 extends through the through structure 124 and extends into the hole structure 113. In the embodiment, the hole structure 113 is penetrated through the back plate 11 . However, in other embodiments, the hole structure 113 may be replaced by a recess that does not extend through the backing plate 11. Preferably, the recess or the hole structure 113 is formed by stamping the back plate 11.

In this embodiment, the first protruding structure 142 extends into the hole structure 113, so that the fixing effect of the first protruding structure 142 can be increased; and when an external force such as a mechanical impact is received, the frame 14 does not fall off. Out.

6 is a perspective exploded view of a third embodiment of a backlight module of the present invention; and FIG. 7 is a cross-sectional view showing a third embodiment of the backlight module of the present invention. The backlight module 3 of the present embodiment is substantially the same as the backlight module 1 (FIGS. 1 to 3) of the first embodiment, wherein the same components are given the same component symbols. The backlight module 3 of the present embodiment is different from the backlight module 1 ( FIGS. 1 to 3 ) in that the bottom plate 111 of the back plate 11 of the backlight module 3 further has at least one second protruding structure 114 . The two protruding structures 114 extend within the through structure 124. Referring to FIG. 7 , the second protruding structure 114 is formed by stamping the back plate 11 , the cross-sectional area of the second protruding structure 114 is substantially the same as the cross-sectional area of the first protruding structure 142 , and the second protruding structure 114 is The first protruding structure 142 is contacted. However, in other embodiments, the second protruding structure 114 may not contact the first protruding structure 142.

Figure 8 is a cross-sectional view showing the combination of the fourth embodiment of the backlight module of the present invention. The backlight module 4 of the present embodiment is substantially the same as the backlight module 3 (FIGS. 6 to 7) of the third embodiment, wherein the same components are given the same component symbols. The difference between the backlight module 4 of the present embodiment and the backlight module 3 ( FIGS. 6 to 7 ) is that the first protruding structure 142 of the frame 14 of the backlight module 4 has a first opening 1421 , and the first The two protruding structures 114 are inserted into the first opening 1421.

Figure 9 is a cross-sectional view showing the combination of the fifth embodiment of the backlight module of the present invention. The backlight module 5 of the present embodiment is substantially the same as the backlight module 3 (FIGS. 6 to 7) of the third embodiment, wherein the same components are given the same component symbols. The difference between the backlight module 5 of the present embodiment and the backlight module 3 ( FIGS. 6 to 7 ) is that the second protruding structure 114 of the back panel 11 of the backlight module 5 has a second opening 1141 , and A protruding structure 142 is inserted into the second opening 1141.

10 is a perspective exploded view of a sixth embodiment of the backlight module of the present invention; FIG. 11 is a plan view showing a combination of a sixth embodiment of the backlight module of the present invention; FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. Figure. The backlight module 6 of the present embodiment is substantially the same as the backlight module 1 (FIGS. 1 to 3) of the first embodiment, wherein the same components are given the same component symbols. The backlight module 6 of the present embodiment is different from the backlight module 1 ( FIGS. 1 to 3 ) in that the through structure 126 of the light guide plate 12 of the backlight module 6 is a trench Side 121. In the present embodiment, the trench 126 is not a complete hole and penetrates through the light guide plate 12. As with the first embodiment, the first protruding structure 142 extends within the through structure 126. In this embodiment, a distance between a bottom surface of the first protruding structure 142 and a bottom surface 123 of the light guide plate 12 is provided. In other embodiments, the first protruding structure 142 can also extend to the bottom surface 123 of the light guide plate 12, that is, the bottom surface of the first protruding structure 142 is flush with the bottom surface 123 of the light guide plate 12. It can be understood that the through structures 126 of the light guide plate 12 in the second to fifth embodiments may be in the form of the grooves.

In addition, the groove formed by the through structure 126 may be formed on the side surface 121 in the form of a continuous groove, which may extend from the top surface 122 from the bottom surface 123, which is not shown in the following description, or from the top surface The lower edge extends, but does not need to extend along the bottom surface. Moreover, it may be formed on the side surface in the form of a discontinuous groove, that is, two groove systems may be respectively formed on the adjacent top surface and bottom surface.

13 is a perspective exploded view of a seventh embodiment of a backlight module of the present invention; and FIG. 14 is a cross-sectional view showing a seventh embodiment of the backlight module of the present invention. The backlight module 7 of the present embodiment is substantially the same as the backlight module 3 (FIGS. 6 to 7) of the third embodiment, wherein the same components are given the same component symbols. The backlight module 6 of the present embodiment is different from the backlight module 3 ( FIGS. 6 to 7 ) in that the light guide plate 12 does not have a through structure, but has at least one upper recess 127 and at least a lower recess 128 . The upper recess 127 is located on the top surface 122, and the lower recess 128 is located on the bottom surface 123. In the present embodiment, the upper recess 127 and the lower recess 128 are holes that are not connected to each other but corresponding to each other, and are located on the protruding portion 125. In other embodiments, the positions of the upper recess 127 and the lower recess 128 do not correspond to each other, but are staggered with each other.

Referring to FIG. 14, the second protruding structure 114 of the backing plate 11 extends in the lower recess 128, and the first protruding structure 142 of the frame 14 extends into the upper recess 127.

15 is an exploded perspective view showing an eighth embodiment of the backlight module of the present invention; and FIG. 16 is a cross-sectional view showing the eighth embodiment of the backlight module of the present invention. The backlight module 8 of the present embodiment is substantially the same as the backlight module 7 (FIGS. 13 to 14) of the seventh embodiment, wherein the same components are given the same component symbols. The backlight module 8 of the present embodiment is different from the backlight module 7 (FIGS. 13 to 14) in that the recess 127 and the lower recess 128 of the light guide plate 12 of the backlight module 8 are respectively an upper trench. The 127a and the lower groove 128a are open to the side surface 121. In this embodiment, the upper trench 127a and the lower trench 128a are not a complete hole. Similar to the seventh embodiment, the second protruding structure 114 of the back plate 11 extends in the lower groove 128a, and the first protruding structure 142 of the frame 14 extends into the upper groove 127a.

In particular, the through structure 124, 126 or the upper recessed portion 127 of the present invention may be disposed in the light guide plate 12 (referring to the rectangular interior of the light guide plate 12) or in the protruding portion 125 (the rectangular outer portion of the light guide plate 12) The through-structures 124, 126 or the upper recesses 127 may be disposed on the side of the light guide plate 12 adjacent to the light source 13, or adjacent to the two sides of the light guide plate 12 of the light source 13 or one of them, or the light guide plate 12 away from the light source 13. The side, of course, can also be a combination of the above.

In addition, in the illustration of the present invention, the rib 141 has a gap between the top surface 122 of the light guide plate 12, and the gap can be used to provide at least one optical film (not shown), such as a diffusion film and a light collecting film. The collimating film, the reflective brightness enhancing film, etc.; or the optical film may not be disposed therebetween, and the rib 141 and the top surface 122 may be closer together.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

1. . . First embodiment of backlight module of the present invention

2. . . Second embodiment of backlight module of the present invention

3. . . Third embodiment of the backlight module of the present invention

4. . . Fourth embodiment of the backlight module of the present invention

5. . . Fifth embodiment of the backlight module of the present invention

6. . . Sixth embodiment of the backlight module of the present invention

7. . . Seventh embodiment of the backlight module of the present invention

8. . . Eighth embodiment of the backlight module of the present invention

11. . . Backplane

12. . . Light guide

13. . . light source

14. . . frame

111. . . Bottom plate

112. . . Side wall

113. . . Hole structure

114. . . Second protruding structure

121. . . side

122. . . Top surface

123. . . Bottom

124, 126. . . Through structure

125. . . Protruding

127. . . Upper depression

127a. . . Upper groove

128. . . Lower depression

128a. . . Lower groove

141. . . Rib

142. . . First protruding structure

1141. . . Second opening

1421. . . First opening

1 is an exploded perspective view showing a first embodiment of a backlight module of the present invention;

2 is a top plan view showing the combination of the first embodiment of the backlight module of the present invention;

Figure 3 shows a cross-sectional view along line 3-3 of Figure 2;

4 is an exploded perspective view showing a second embodiment of the backlight module of the present invention;

Figure 5 is a cross-sectional view showing the combination of the second embodiment of the backlight module of the present invention;

6 is a perspective exploded view showing a third embodiment of the backlight module of the present invention;

7 is a cross-sectional view showing a combination of a third embodiment of the backlight module of the present invention;

Figure 8 is a cross-sectional view showing the combination of the fourth embodiment of the backlight module of the present invention;

Figure 9 is a cross-sectional view showing the combination of the fifth embodiment of the backlight module of the present invention;

FIG. 10 is a perspective exploded view showing a sixth embodiment of the backlight module of the present invention; FIG.

11 is a top plan view showing a combination of a sixth embodiment of the backlight module of the present invention;

Figure 12 shows a cross-sectional view along line 12-12 of Figure 11;

Figure 13 is a perspective exploded view showing a seventh embodiment of the backlight module of the present invention;

Figure 14 is a cross-sectional view showing the combination of the seventh embodiment of the backlight module of the present invention;

15 is an exploded perspective view showing an eighth embodiment of the backlight module of the present invention; and

Figure 16 is a cross-sectional view showing the eighth embodiment of the backlight module of the present invention in combination.

1. . . First embodiment of backlight module of the present invention

11. . . Backplane

12. . . Light guide

13. . . light source

14. . . frame

111. . . Bottom plate

112. . . Side wall

121. . . side

122. . . Top surface

123. . . Bottom

124. . . Through hole

125. . . Protruding

141. . . Rib

142. . . First protruding structure

Claims (21)

A backlight module includes: a light guide plate having at least one side surface, a top surface, a bottom surface, and at least one through structure, the through structure is penetrated from the top surface to the bottom surface; at least one light source facing the side or a bottom plate; a back plate for accommodating the light guide plate and the light source; and a frame disposed above the top surface of the light guide plate, the frame having at least one first protruding structure, the first protruding structure extending Within the through structure. The backlight module of claim 1, wherein the back plate has at least one second protruding structure, and the second protruding structure extends within the through structure. The backlight module of claim 2, wherein the second protruding structure is formed by stamping the back sheet. The backlight module of claim 1, wherein the back plate has at least one hole structure or at least one recess, and the first protruding structure extends in the hole structure or the recess. The backlight module of claim 4, wherein the recess or the hole structure is formed by stamping the back plate. The backlight module of claim 1, wherein the through structure is a consistent perforation. The backlight module of claim 1, wherein the through structure is a groove that is open to the side. The backlight module of claim 1, wherein the frame is a plastic frame, and further has a rib, the rib being integrally formed with the first protruding structure. The backlight module of claim 2, wherein the second protruding structure contacts the first protruding structure. The backlight module of claim 2, wherein the first protruding structure has a first opening, and the second protruding structure is inserted into the first opening. The backlight module of claim 2, wherein the second protruding structure has a second opening, and the first protruding structure is inserted into the second opening. The backlight module of claim 1, wherein the side surface of the light guide plate further has at least one protruding portion, and the through structure is located at the protruding portion. A backlight module includes: a light guide plate having at least one side surface, a top surface, a bottom surface, and at least one upper recessed portion, wherein the upper recess is located on the top surface; at least one light source facing the side surface or the bottom surface a back plate for accommodating the light guide plate and the light source, and a frame disposed above the top surface of the light guide plate, the frame having at least one first protruding structure, the first protruding structure extending to Inside the upper depression. The backlight module of claim 13, wherein the bottom surface of the light guide plate has at least a lower recess. The backlight module of claim 14, wherein the upper recess and the lower recess are holes or grooves that are open to the side. The backlight module of claim 14, wherein the back plate has at least one second protruding structure, the second protruding structure extending in the lower recess. The backlight module of claim 16, wherein the second protruding structure is formed by stamping the back sheet. The backlight module of claim 13, wherein the frame is a plastic frame, and further has a rib, the rib being integrally formed with the first protruding structure. The backlight module of claim 14, wherein the side surface of the light guide plate further has at least one protruding portion, and the upper concave portion and the lower concave portion are located at the protruding portion. The backlight module of claim 14, wherein the upper recess and the lower recess are not in communication with each other. The backlight module of claim 14, wherein the upper recess and the lower recess are staggered with each other.