TWI393960B - Frame, metal frame, backlight module, and lcd thereof - Google Patents

Description

Back frame, metal back frame and backlight module thereof and liquid crystal display

The present invention relates to a liquid crystal display, and more particularly to a backlight module for a liquid crystal display.

In recent years, liquid crystal displays (LCDs) have gradually replaced traditional cathode ray tube displays (CRTs) because of their lightness and thinness, and are widely used, for example, in personal digital assistants (Personal Digital). Tube; PDA) and display devices for various electronic products such as LCD TVs.

The backlight module is one of the key components of the liquid crystal display. In view of the fact that the liquid crystal itself does not emit light, it is necessary to supply a light source by means of a backlight module, so that the liquid crystal panel can provide a normal and well-balanced image. In the backlight module, there are a reflective sheet and a plurality of optical films, such as a light guide plate, a diffusion sheet and a cymbal sheet, which are used to uniformly distribute the light emitted by the light source on the liquid crystal panel, thereby improving the brightness of the liquid crystal panel.

The backlight, the reflective sheet and the respective optical films in the backlight module, such as a light guide plate, a diffusion sheet, etc., must be firmly fixed to the frame to prevent the respective components from colliding with each other when the liquid crystal display is shaken.

On the other hand, in order to cope with the trend of thinning electronic products, the thickness of the liquid crystal display and its backlight module is gradually reduced. Under this trend, the fixing structure for fixing the optical film, such as an iron frame and a plastic frame, may be reduced in size and thickness, and the frame may also be cut into a discontinuous structure. As a result, the holding force of the fixed structure is insufficient, which causes problems such as displacement of components, poor jointability, or collision with each other.

In view of the above, there is a need for a new backlight module of a liquid crystal display and a back frame thereof, which can stably fix an optical film and are in a tendency to be thinner.

One embodiment of the present invention provides a back frame suitable for a backlight module of a liquid crystal display, which can be used to provide sufficient holding force of an optical film such as a light guide plate to avoid the above problems.

The back frame has a bottom plate, a pair of connecting portions, and a clamping piece. The bottom plate is used to carry the light guide plate. The connecting portion is connected to the bottom plate and respectively stands on opposite sides of the light guide plate. The clamping piece is located above the bottom plate and connects the two connecting portions. The clamping piece is used to restrain the light guide plate between the clamping piece and the bottom plate.

It can be seen that the light guide plate can be fixed by the clamping piece and the bottom plate to limit the movement of the light guide plate in the downward direction. The movement of the light guide plate in the left-right direction can be further restricted by the connecting portions on both sides.

The above-mentioned holding piece, the connecting portion and the bottom plate are integrally formed. In other words, the back frame can be integrally formed. There are many specific ways to do this. For example, the back frame can be made of a sheet material by stamping or the like.

In an embodiment of the invention, the protrusion is formed by stamping on the bottom plate, and the clamping piece and the connecting portion are formed by cutting, and an opening is formed in the bottom plate. Wherein, the opening penetrates the bottom plate and is aligned with the clamping piece.

Another embodiment of the present invention provides a backlight module for a liquid crystal display. The backlight module has a fixed structure to firmly fix components in the backlight module.

The backlight module has a light guide plate, a light source, a bottom plate, a pair of connecting portions and a clamping piece. The light source is used to guide the light panel to emit light. The bottom plate carries a light guide plate. The two connecting portions are connected to the bottom plate and respectively stand on opposite sides of the light guide plate. The clamping piece is located above the bottom plate and is connected to the connecting portion for restraining the light guiding plate between the clamping piece and the bottom plate.

From this, it can be seen that the light guide plate is restrained by the holding piece and the bottom plate in the vertical direction, and is restrained by the two connecting portions in the horizontal direction, so that it can be stably fixed in the backlight module.

Another embodiment of the present invention provides a liquid crystal display that can secure components therein through a fixed structure. The liquid crystal display has a light source, a liquid crystal panel, a light guide plate, a bottom plate, a pair of connecting portions, and a holding piece. The light guide plate is used to guide the light emitted by the light source to the liquid crystal panel. The bottom plate carries a light guide plate. The two connecting portions are connected to the bottom plate and respectively stand on opposite sides of the light guide plate. The clamping piece is located above the bottom plate and is connected to the connecting portion for restraining the light guiding plate between the clamping piece and the bottom plate.

The light guide plate can be fixed by the clamping piece and the bottom plate to limit the movement of the light guide plate in the downward direction, so as to prevent the light guide plate from striking other components such as a light source or a liquid crystal panel.

The above-mentioned holding piece does not overlap with the display area of the liquid crystal panel, so that the holding piece does not cover the light guided from the light guide plate to the display area without affecting the quality of the display.

In an embodiment of the invention, the liquid crystal display further comprises a plastic frame. The plastic frame carries the liquid crystal panel and separates the clamping piece and the liquid crystal panel. Thereby, the holding piece is not pressed to the liquid crystal panel.

Another embodiment of the present invention provides a metal back frame that can be adapted to hold an optical film. The metal back frame has a bottom plate and a fixed structure. The bottom plate has an opening. The fixing structure is integrally formed with the bottom plate and includes a clamping piece, a first connecting portion and a second connecting portion. The clamping piece is disposed above the opening. The first connecting portion arc-connects one end of the clamping piece and the bottom plate. The second connecting portion arc-connects the other end of the clamping piece to the bottom plate. In this way, the fixing structure can clamp the component to be clamped, such as an optical film, between the clamping piece and the bottom plate.

Another embodiment of the present invention provides a backlight module having the above metal back frame, a circuit board, a light source, and a light guide plate. The circuit board is disposed between the bottom plate and the fixed structure. The light source is disposed on the circuit board and electrically connected to the circuit board. The light guide plate is disposed between the circuit board and the fixed structure. The light incident surface of the light guide plate corresponds to the light source. The upper surface of the light guide plate corresponds to the holding piece of the fixed structure. The lower surface of the light guide plate corresponds to the bottom plate. The first end surface of the light guide plate corresponds to the first connection portion of the fixing structure. The second end surface of the light guide plate corresponds to the second connection portion of the fixed structure.

Another embodiment of the present invention provides a liquid crystal display having the above-described backlight module, plastic frame, and liquid crystal panel. The metal back frame in the backlight module further includes a side plate, and the side plate is connected to the bottom plate. The plastic frame is disposed on the light source and the light guide plate, and includes a section between the fixed structure and the bottom plate of the metal back frame. The liquid crystal panel is disposed on the plastic frame.

Therefore, the upper and lower surfaces of the light guide plate are restrained by the holding piece and the bottom plate, and the first and second end faces are also restrained by the two connecting portions, so that the liquid crystal display and the backlight module thereof can be stably fixed.

One embodiment of the present invention provides a back frame that can be used to hold a light guide plate and is in a tendency to be thinner.

FIGS. 1 and 2 are each a perspective view of the back frame 100 according to an embodiment of the present invention before and after the light guide plate 210 is mounted. Please refer to Figure 1. The back frame 100 has a bottom plate 110 and a fixed structure 120. The fixed structure 120 includes a clamping piece 122 and a pair of connecting portions 124a, 124b. The two connecting portions 124a and 124b are connected to the bottom plate 110. The clamping piece 122 is located above the bottom plate 110 and connects the two connecting portions 124a, 124b.

Please refer to Figure 2. In use, the bottom plate 110 is used to carry the light guide plate 210. The two connecting portions 124a and 124b are respectively disposed on opposite sides of the light guide plate 210. The clamping piece 122 is used to restrain the light guide plate 210 between the clamping piece 122 and the bottom plate 110. It can be seen that the light guide plate 210 can be fixed by the clamping piece 122 and the bottom plate 110 to restrict the vertical movement of the light guide plate 210 in the vertical direction, that is, to restrict the movement of the light guide plate 210 in the direction perpendicular to the bottom plate 110. The horizontal movement of the light guide plate 210 in the horizontal direction can be further restricted by the two connecting portions 124a, 124b, that is, the movement of the light guide plate 210 in the direction parallel to the extending direction of the holding piece 122 is restricted.

Please refer to Figure 1. In this embodiment, the back frame 100 may be integrally formed, that is, the clamping piece 122, the connecting portions 124a, 124b, and the bottom plate 110 may be integrally formed. There are many specific ways to do this. For example, the holding piece 122 and the connecting portions 124a, 124b can be formed on the bottom plate 110 by punching. Therefore, in the present embodiment, the two connecting portions 124a, 124b are arc-connected to the two ends of the clamping piece 122 and the bottom plate 110, respectively, so that the bonding between the bottom plate 110 and the fixing structure 120 can be compared. Good strength. In other embodiments, the two connecting portions 124a, 124b are respectively connected in an arc shape or a right angle to both ends of the holding piece 122 or the bottom plate 110.

Through the stamping process described above, an opening 126 is formed in the bottom plate 110. Specifically, the opening 126 extends through the bottom plate 110 and is aligned with the clamping tab 122. That is, the clamping tab 122 will be located above the opening 126. In addition, when the light guide plate 210 is fixed by using the fixing structure 120, the opening 126 is covered by the light guide plate 210 and/or the main body 231 of the circuit board 230, as shown in FIG. 5, FIG. 6, and FIG.

The material of the back frame 100 described above may be made of a suitable material such as metal or plastic according to practical needs. In an embodiment of the present invention, the material of the back frame 100 is a material suitable for a stamping process, such as stainless steel plate (SUS304), stainless steel plate (SUS430), galvanized steel plate (SGLC), aluminum alloy plate (AL5052), etc. metallic material. That is, the material of the holding piece 122, the connecting portions 124a, 124b, and the bottom plate 110 may be metal. If the material of the back frame 100 is plastic, it can be manufactured by a general plastic molding method.

The back frame 100 described above can be applied to a backlight module, in particular, a backlight module of a liquid crystal display, or a backlight module of other flat display. 3 and 4 are perspective views of the backlight module 200 according to another embodiment of the present invention before and after the light guide plate 210 and the light source 220 are mounted. Fig. 5 is a cross-sectional view taken along line 5 of Fig. 3. Fig. 6 is a cross-sectional view taken along line 6 of Fig. 3.

Please refer to Figures 3 and 9. The backlight module 200 is used to provide uniform light of the liquid crystal panel 310 or other planar panels. The backlight module 200 has a light guide plate 210 and a light source 220, wherein the light source 220 is used to guide the light plate 210 to emit light. In this example, the light source 220 is a Light Emitting Diode (LED), but is not limited thereto. The back frame 100 can be used to receive and fix the light guide plate 210 and the light source 220.

Please refer to Figure 5 and Figure 9. In the embodiment of the present invention, the backlight module 200 is an edge-lit backlight module, that is, the light-incident surface 212 and the upper surface 214 or the lower surface 216 of the light guide plate 210 are not parallel to each other, and the light-incident surface 212 directly faces the light source. 220. Structurally, the upper surface 214 of the light guide plate 210 corresponds to the liquid crystal panel 310 and the clamping sheet 122, the lower surface 216 of which corresponds to the bottom plate 110, and the light incident surface 212 thereof stands on the side of the upper surface 214 and the lower surface 216. And is in contact with the upper surface 214 and the lower surface 216. The light source 220 is located on one side of the light guide plate 210 and the clamping sheet 122 to correspond to the light incident surface 212 of the light guide plate 210.

Please refer to Figures 4 and 3. In order to supply power to the light source 220, the light source 220 is disposed on the main body 231 of the circuit board 230. The circuit board 230 is electrically connected to the light source 220 and the outside world, such as a power supply (not shown). In order to place the light source 220 on the light incident surface 212 side of the light guide plate 210, when the backlight module 200 is assembled, the main body 231 of the circuit board 230 can pass through the fixing structure 120, as shown in FIG. Moreover, the connecting end 232 of the circuit board 230 can also pass between the light guide plate 210 and the connecting portion 124a to be electrically connected to the outside, such as a power supply (not shown). In this embodiment, the connecting end 232 is a flexible circuit board electrically connected to the main body 231 of the circuit board 230, and the light source 220 is a light emitting diode, and forms a light emitting diode light strip with the circuit board 230. (LED Light Bar).

In detail, please refer to Figure 6 and Figure 3. The connecting portions 124a, 124b may correspond to the first end surface 218a and the second end surface 218b of the light guide plate 210, respectively. The connection end 232 of the circuit board 230 passes between the first end surface 218a and the connection portion 124a. Please refer to Figure 5. In the embodiment of the present invention, the main body 231 of the circuit board 230 can also pass between the lower surface 216 of the light guide plate 210 and the bottom plate 110, that is, through the fixing structure 120.

Please refer to Figure 6. In order to firmly clamp and limit the horizontal position of the light guide plate 210, the connecting portion 124b may be adjacent to the second end surface 218b of the light guide plate 210. For example, in the embodiment of the present invention, the interval D2 between the connecting portion 124b and the second end surface 218b of the light guide plate 210 is between 0.1 mm and 0.2 mm.

In addition, the spacing between the connecting portion 124a and the light guide plate 210 may be large, that is, the connecting portion 124a may not be adjacent to the first end surface 218a of the light guide plate 210 for other components to pass through. For example, the interval D1 between the connecting portion 124a and the first end surface 218a of the light guide plate 210 may be larger, that is, larger than the interval D2 between the connecting portion 124b and the second end surface 218b, for the connecting end 232 to pass through. However, in other embodiments, if there is another connection end 232 connection mode or a power supply connection mode, the connection end 232 does not need to pass through the interval D1, and the two connection portions 124a, 124b of the fixed structure 120 can be simultaneously adjacent to each other. The first end surface 218a and the second end surface 218b of the light plate 210 are provided to provide a better holding force of the light guide plate 210.

The back frame 100 described above can be applied to a liquid crystal display. 7 and 8 respectively show a perspective view and an exploded view of a liquid crystal display 300 according to another embodiment of the present invention. Fig. 9 is a cross-sectional view taken along line 9 of Fig. 7.

Please refer to Figure 8. The liquid crystal display 300 has a liquid crystal panel 310 and a backlight module 200. The backlight module 200 is configured to provide a uniform backlight of the liquid crystal panel 310. Specifically, the light guide plate 210 in the backlight module 200 is used to guide the light emitted by the light source 220 to the liquid crystal panel 310.

Please refer to Figure 9. In the embodiment of the present invention, when the light guide plate 210 is fixed by the fixing structure 120, the holding piece 122 is located above the upper surface 214 of the light guide plate 210.

In order to prevent the clamping sheet 122 from blocking the light guided by the light guide plate 210 to affect the display screen of the liquid crystal panel 310, the clamping sheet 122 is aligned with the portion of the non-display area 314 of the liquid crystal panel 310, or is located in the non-display area 314 of the liquid crystal panel 310. There is no overlap with the display area 312 of the liquid crystal panel 310 or outside the display area 312 of the liquid crystal panel 310. As a result, the light guided by the light guide plate 210 to the display area 312 of the liquid crystal panel 310 is not blocked by the clamping piece 122, so the brightness of the display is not affected.

For example, in the embodiment of the present invention, the clamping piece 122 is clamped on the upper surface 214 of the light guide plate 210 near one side of the light incident surface 212. In the embodiment of the present invention, the clamping piece 122 is close to the light incident surface 212 of the light guide plate 210 or is aligned with the light incident surface 212 to be aligned with the non-display area 314 of the liquid crystal panel 310, or the clamping piece 122 is made. Located within the non-display area 314. Specifically, the distance D3 between the clamping sheet 122 and the light incident surface 212 of the light guide plate 210 is from about 0 mm to about 2 mm. In a preferred embodiment, the distance D3 is about 1 mm. Wherein, 0 mm refers to the side of the holding piece 122 adjacent to the light source 220, which is aligned with the light incident surface 212, and the distance greater than 0 mm guides the light incident surface 212 of the light plate 210 to protrude from the clip. The tab 122 is adjacent to one side of the light source 220. In other embodiments, the side of the holding piece 122 adjacent to the light source 220 may also protrude from the light incident surface 212 of the light guide plate 210 as long as the fixing structure 120 is sufficient to fix the light guide plate 210.

In order to further prevent the holding piece 122 from covering the light transmitted to the display area 312, the width W1 of the holding piece 122 is smaller than the width W2 of the non-display area 314. The width W1 of the clamping piece 122 may be between 1 mm and 5 mm. In a preferred embodiment, the width W1 of the clamping tab 122 is about 2 mm.

In the embodiment in which the clamping piece 122 is made of a metal material, in order to prevent the clamping piece 122 from being pressed or scratched by the liquid crystal panel 310, the liquid crystal display 300 may have a plastic frame 320 for holding the clamping piece 122 and the liquid crystal panel 310. Separate. Specifically, in this embodiment, the plastic frame 320 is located above the light source 220 and the light guide plate 210, and the liquid crystal panel 310 is located above the plastic frame 320. The plastic frame 320 has a bearing surface for carrying the liquid crystal panel 310. A portion of the bezel 320 may be interposed between the liquid crystal panel 310 and the light guide plate 210 to separate and not contact the two. For example, the height H1 of the portion of the plastic frame 320 between the liquid crystal panel 310 and the light guide plate 210 may be greater than or higher than the height H2 of the clamping sheet 122 such that the interval D4 between the liquid crystal panel 310 and the light guide plate 210 is greater than the clip. The height H2 of the holding piece 122 further separates the holding piece 122 from the liquid crystal panel 310.

Referring to FIG. 8 , in order to make the light transmitted from the light guide plate 210 to the liquid crystal panel 310 uniform, the liquid crystal display 300 may have the optical film set 330 . Please refer to Figure 9. The optical film group 330 is disposed between the light guide plate 210 and the liquid crystal panel 310. The optical film set 330 is used to homogenize light, which may have optical films such as diffusers and cymbals that evenly disperse light. In an embodiment of the invention, the optical film set 330 has an upper diffuser 332, a top gusset 334, a lower gusset 336, and a lower diffuser 338.

The optical film set 330 is located on one side of the holding piece 122 and substantially aligned with the display area 312 of the liquid crystal panel 310. The optical film may also partially protrude above the clamping piece 122. For example, in an embodiment of the invention, the upper diffuser 332 is partially overlaid on the clamping tab 122 to prevent light leakage.

Please refer to Figure 8. In order to prevent light from being exposed from the lower surface 216 of the light guide plate 210, the liquid crystal display 300 may be provided with a reflection sheet 340. Please refer to Figure 9. The reflective sheet 340 is located between the lower surface 216 of the light guide plate 210 and the bottom plate 110 for reflecting light emitted from the lower surface 216 of the light guide plate 210 back into the light guide plate 210. Thereby, the light emitted by the light source 220 is effectively utilized.

Please refer to Figure 8 and Figure 9. In order to fix the various components in the liquid crystal display 300, the back frame 100 may have side panels 130. The side plate 130 is connected to the bottom plate 110, or the side plate 130 is integrally formed with the bottom plate 110 and surrounds the periphery of the light guide plate 210. The side plate 130 surrounds elements in the liquid crystal display 300, such as the light source 220, the light guide plate 210, the optical film group 330, and the liquid crystal panel 310.

Please refer to Figure 8. In order to further fix the respective components, the liquid crystal display 300 further has a plurality of tapes 352, 354, 356, 358 for fixing the respective components in the liquid crystal display 300 in an adhesive manner. For example, the tape 352 can be used to adhere the backlight module 200 and the liquid crystal panel 310. Tape 354 can be used to adhere the connection end 232 of the circuit board 230 to the bottom plate 110. Tape 356 can be used to adhere circuit board 230 and bottom plate 110. The tape 358 can be used to adhere the light guide plate 210 and the bottom plate 110.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100. . . Back frame

110. . . Bottom plate

120. . . Fixed structure

122. . . Holding piece

124a. . . Connection

124b. . . Connection

126. . . Opening

130. . . Side panel

200. . . Backlight module

210. . . Light guide

212. . . Glossy surface

214. . . Upper surface

216. . . lower surface

218a. . . First end face

218b. . . Second end face

220. . . light source

232. . . Connection end

230. . . Circuit board

231. . . main body

300. . . LCD Monitor

310. . . LCD panel

312. . . Display area

314. . . Non-display area

320. . . Plastic frame

330. . . Optical film set

332. . . Upper diffuser

334. . . Captain

336. . . Bottom piece

338. . . Lower diffuser

340. . . A reflective sheet

350-358. . . tape

5, 6, 9. . . Section line

D1. . . The distance between the light guide plate and the connecting portion

D2. . . The distance between the light guide plate and the connecting portion

D3. . . Distance from the clamping piece to the edge of the light guide

D4. . . The interval between the liquid crystal panel and the light guide plate

W1. . . Clip width

W2. . . Non-display area width

H1. . . The height of the portion of the plastic frame between the liquid crystal panel and the light guide plate

H2. . . Height of the clamping piece

1 and 2 are perspective views of the back frame of the embodiment of the present invention before and after the light guide plate 210 is mounted.

3 and 4 are perspective views of the backlight module according to another embodiment of the present invention before and after the light guide plate and the light source are mounted.

Fig. 5 is a cross-sectional view taken along line 5 of Fig. 3.

Fig. 6 is a cross-sectional view taken along line 6 of Fig. 3.

7 and 8 are respectively a perspective view and an exploded view of a liquid crystal display according to another embodiment of the present invention.

Fig. 9 is a cross-sectional view taken along line 9 of Fig. 7.

100. . . Back frame

110. . . Bottom plate

120. . . Fixed structure

122. . . Holding piece

124a. . . Connection

124b. . . Connection

126. . . Opening

210. . . Light guide

Claims (18)

A back frame, which is suitable for a backlight module of a liquid crystal display, the back frame includes: a bottom plate for carrying a light guide plate; a pair of connecting portions connected to the bottom plate and respectively standing on opposite sides of the light guide plate; a clamping piece located above the bottom plate and connecting the connecting portions for restraining the light guiding plate between the clamping piece and the bottom plate, wherein the clamping piece, the connecting portions and the bottom plate are One piece is formed. The back frame of claim 1, further comprising: an opening extending through the bottom plate and aligning the clamping piece. The back frame of claim 1, wherein the holding piece, the connecting portion and the bottom plate are made of metal. A backlight module of a liquid crystal display, comprising: a light guide plate; a light source for emitting light to the light guide plate; a bottom plate carrying the light guide plate; a pair of connecting portions connected to the bottom plate and respectively standing on the light guide plate And opposite sides of the bottom plate; and a clamping piece located above the bottom plate and connecting the connecting portions for restraining the light guide plate between the clamping piece and the bottom plate, wherein the clamping plate The holding piece, the connecting portion and the bottom plate are integrally formed. The backlight module of claim 4, further comprising: a circuit board electrically connected to the light source, one end of the circuit board passing between the light guide plate and the connecting portions. The backlight module of claim 4, further comprising: an opening extending through the bottom plate and aligned with the clamping piece, wherein the light guiding plate covers the opening. The backlight module of claim 4, wherein the holding piece, the connecting portion and the bottom plate are made of metal. A liquid crystal display comprising: a light source; a liquid crystal panel; a light guide plate for guiding light emitted by the light source to the liquid crystal panel; a bottom plate carrying the light guide plate; and a pair of connecting portions connecting the bottom plate And respectively standing on opposite sides of the light guide plate; and a clamping piece located above the bottom plate and connecting the connecting portions for restraining the light guide plate between the clamping piece and the bottom plate, wherein The clamping piece, the connecting portions and the bottom plate are integrally formed. The liquid crystal display of claim 8, further comprising: a circuit board electrically connected to the light source, one end of the circuit board passing between the light guide plate and the connecting portions. The liquid crystal display of claim 8, wherein the holding piece does not overlap with a display area of the liquid crystal panel. The liquid crystal display of claim 8, further comprising: a plastic frame carrying the liquid crystal panel and separating the clamping piece and the liquid crystal panel. A metal back frame, comprising: a bottom plate having an opening; and a fixing structure integrally formed with the bottom plate, and comprising: a clamping piece disposed above the opening; a first connecting portion, the arc connecting One end of the clamping piece and the bottom plate; and a second connecting portion arc-connecting the other end of the clamping piece and the bottom plate. A backlight module, comprising: a metal back frame as claimed in claim 12; a circuit board disposed between the bottom plate and the fixed structure; a light source disposed on the circuit board and electrically connected to the circuit board; a light guide plate disposed between the circuit board and the fixed structure, the light guide plate comprising: a light incident surface corresponding to the light source; An upper surface corresponding to the clamping piece of the fixing structure; a lower surface corresponding to the bottom plate; a first end surface corresponding to the first connecting portion of the fixing structure; and a second end surface corresponding to the fixing The second connection of the structure. The backlight module of claim 13, wherein a spacing between the first end surface of the light guide plate and the first connecting portion of the fixing structure is greater than the second end surface of the light guiding plate and the first portion of the fixing structure The spacing between the two connections. The backlight module of claim 13, wherein the circuit board further comprises: a connecting end disposed between the first end surface of the light guiding plate and the first connecting portion of the fixing structure. A liquid crystal display, comprising: a backlight module according to any one of claims 13 to 15, wherein the metal back frame further comprises a side plate connected to the bottom plate; and a liquid crystal panel; A plastic frame is disposed on the light source and the light guide plate, and includes a portion between the liquid crystal panel and the light guide plate. The liquid crystal display of claim 16, further comprising: an optical film set disposed between the light guide plate and the liquid crystal panel. The liquid crystal display of claim 17, wherein the optical film set comprises: an upper diffusion sheet partially attached to the clamping piece of the fixing structure.