TWI384297B - Backlight module and back bezel thereof, and liquid cryatal display apparatus - Google Patents

Description

Backlight module and back plate thereof and liquid crystal display device

The present invention relates to a surface light source device, and more particularly to a backlight module and a back plate thereof, and a liquid crystal display device using the same.

With the advancement of liquid crystal display technology and the advantages of light weight and small size of liquid crystal display devices, liquid crystal display devices have become mainstream display devices.

1 is a partial cross-sectional view showing a conventional liquid crystal display device. Referring to FIG. 1 , the liquid crystal display device 100 includes a liquid crystal display panel 110 and a backlight module 120 disposed under the liquid crystal display panel 110 . The backlight module 120 is a side-lit backlight module for providing a surface. The light source is to the liquid crystal display panel 110.

The backlight module 120 includes a back plate 121, a light source 122, a light guide plate 123, a reflection sheet 124, and a plurality of optical films 125. The backing plate 121 has an integrally formed bottom portion 121a, a side wall 121b and a top portion 121c, wherein the side wall 121b is connected between the top portion 121c and the bottom portion 121a, and the top portion 121c is opposed to the partial bottom portion 121a. A light source accommodating space S1 is formed between the top portion 121c, the bottom portion 121a and the inner side of the side wall 121b, and the light source 122 is disposed in the light source accommodating space S1. The light source 122 includes a substrate 122a and a plurality of light emitting diodes (LEDs) 122b arranged on the substrate 122a and arranged along the Z axis. In addition, the light incident surface 123a of the light guide plate 123 faces the light emitting diode 122b, the reflective sheet 124 is disposed between the light guide plate 123 and the bottom portion 121a of the back plate 121, and the optical film 125 is disposed on the light emitting surface 123b of the light guide plate 123. .

The backlight module 120 further includes a frame 126 for carrying the liquid crystal display panel 110, and a portion of the frame 126 bears against the top portion 121c of the back plate 121. In addition, the backlight module 120 further includes a carrier 127 for carrying the circuit board 132, wherein the carrier 127 is soldered to the sidewall 121b of the backplane 121, and the circuit board 132 is transmitted through a flexible printed circuit board (FPCB). The 134 is electrically connected to the peripheral circuit 112 of the liquid crystal display panel 110 to drive the liquid crystal display panel 110.

In the prior art, since the carrier 127 is connected to the sidewall 121b of the backing plate 121 by soldering, soldering time is required, resulting in poor assembly efficiency of the conventional backlight module 120. In addition, the welding area between the carrier 127 and the side wall 121b of the backing plate 121 is small, so the structural strength of the soldering portion is relatively weak, which will reduce the reliability of the conventional backlight module 120.

The invention provides a backlight module with better reliability.

The invention further provides a liquid crystal display device, wherein the backlight module has better reliability.

The invention further provides a backing plate to save the step of welding the frame body.

To achieve the above advantages, the present invention provides a backlight module including a back plate, a light source, and a light guide plate. The backboard has a bottom, a side wall, a top and at least one bend. The side wall is connected between the top and the bottom, the top is opposite to the bottom part, and a light source accommodating space is formed between the top, the bottom and the inner side of the side wall. The bent portion is connected to one end of the top portion away from the side wall, and is bent toward the side wall, and the bent portion extends to the outside of the side wall to form a frame body outside the side wall. In addition, the light source is disposed in the light source accommodating space, and the light guide plate is disposed at the bottom of the back plate, and the light incident surface of the light guide plate is opposite to the light source.

In an embodiment of the invention, the frame body is a carrier, and the carrier has a receiving slot.

In an embodiment of the invention, the frame body is a lock frame, and the lock frame has at least one locking hole.

In an embodiment of the invention, a part of the light guide plate is located in the light source accommodating space.

In an embodiment of the present invention, the backlight module further includes a frame, and a part of the frame is disposed in the light source accommodating space and abuts between the light guide plate and the top of the back plate, wherein the part of the frame is coupled to the back plate. The top of the combination.

In an embodiment of the invention, the backlight module further includes a buffer sheet disposed between the frame and the light guide plate.

In an embodiment of the invention, the backlight module further includes a reflective sheet disposed between the light guide plate and the bottom of the back plate.

In an embodiment of the invention, the backlight module further includes at least one optical film disposed on the light emitting surface of the light guide plate.

In an embodiment of the invention, the backlight module further includes a buffer sheet disposed on the bent portion of the back plate.

In an embodiment of the invention, the backlight module further includes a frame, wherein a part of the frame is disposed on the bent portion of the back plate.

In an embodiment of the invention, the bottom portion, the side wall, the top portion and the bent portion are integrally formed.

In order to achieve the above advantages, the present invention further provides a liquid crystal display device comprising a liquid crystal display panel and the backlight module, wherein the backlight module is disposed on one side of the liquid crystal display panel.

In an embodiment of the invention, the frame body is a carrier, and the frame body has a receiving groove. In addition, the liquid crystal display device further includes a circuit board and a flexible circuit board, wherein the circuit board is disposed in the receiving groove of the frame body, and the flexible circuit board is electrically connected to the circuit board and the liquid crystal display panel.

In an embodiment of the invention, a part of the liquid crystal display panel is adhered to the bent portion of the backboard.

In an embodiment of the invention, the backlight module further includes a buffer sheet disposed between the partial liquid crystal display panel and the bent portion of the back panel.

In an embodiment of the present invention, the backlight module further includes a frame for carrying the liquid crystal display panel, wherein a part of the frame is disposed on the bent portion of the back plate.

To achieve the above advantages, the present invention further provides a back panel of a backlight module having a bottom, a side wall, a top, and at least one bent portion. The side wall is connected between the top and the bottom, the top is opposite to the bottom part, and a light source accommodating space is formed between the top, the bottom and the inner side of the side wall. The bent portion is connected to one end of the top portion away from the side wall, and is bent toward the side wall, and the bent portion extends to the outside of the side wall to form a frame body outside the side wall.

In an embodiment of the invention, the bottom portion, the side wall and the top portion are integrally formed with the bent portion.

Since the back plate of the backlight module of the present invention has a bent portion, and the bent portion extends to the outside of the side wall to form a frame body, no additional welding of the frame body is required. Thus, the reliability and assembly efficiency of the backlight module of the present invention and the liquid crystal display device using the same can be improved.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

2 is a partial cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention. Referring to FIG. 2 , the liquid crystal display device 200 of the present embodiment includes a liquid crystal display panel 210 and a backlight module 300 . The backlight module 300 is disposed on one side of the liquid crystal display panel 210 to provide a surface light source to the liquid crystal display panel 210 .

The backlight module 300 of the embodiment includes a back plate 310, a light source 320, and a light guide plate 330. The material of the back plate 310 is, for example, a metal such as aluminum or an alloy thereof, but is not limited thereto. In addition, the back plate 310 has a bottom portion 312, a side wall 314, a top portion 316 and at least one bent portion 318, wherein the bottom portion 312, the side wall 314, the top portion 316 and the bent portion 318 are integrally formed, for example. Side wall 314 is coupled between top 316 and bottom 312, and top 316 is opposite partial bottom 312, i.e., top 316 is sized smaller than bottom 312. A light source accommodating space S2 is formed between the top portion 316, the bottom portion 312, and the inner side of the side wall 314. In addition, the bent portion 318 connects one end of the top portion 316 away from the side wall 314 and is bent toward the side wall 314, and the bent portion 318 extends to the outside of the side wall 314 to form the frame 319 outside the side wall 314.

The light source 320 described above is disposed in the light source housing space S2. The light source 320 includes, for example, a substrate 322 and a plurality of point light sources 324 arranged on the substrate 322 and arranged along the Z axis. These point sources 324 can be light emitting diodes, laser diodes, or other suitable point sources. In other embodiments, the light source 320 can also be replaced with a cold cathode fluorescent lamp (CCFL) or other suitable light source. In addition, the light guide plate 330 is disposed on the bottom portion 312 of the back plate 310 , and the light incident surface 332 of the light guide plate 330 is opposite to the light source 320 . Specifically, the light incident surface 332 of the light guide plate 330 is opposite to the point light source 324 of the light source 320, and a part of the light guide plate 330 is located, for example, in the light source accommodating space S2.

In the above liquid crystal display device 200, the point light source 324 is used to supply light to the light guide plate 330, and the light guide plate 330 is used to convert light into a surface light source. The surface light source is emitted from the light emitting surface 334 of the light guide plate 330 and transmitted to the liquid crystal display panel 210. In addition, in order to improve light utilization efficiency, the backlight module 300 may further include a reflective sheet 340 disposed between the light guide plate 330 and the bottom portion 312 of the back plate 310. In addition, in order to improve the quality of the surface light source, the backlight module 300 may further include at least one optical film 350 disposed on the light emitting surface 324 of the light guide plate 330. The optical film 350 may be a diffusion film, a brightness enhancement film (BEF), or a combination thereof, but is not limited thereto.

The backlight module 300 can further include a frame 360 for carrying the liquid crystal display panel 210, wherein the partial frame 360 is disposed on the bent portion 318 of the back plate 310. In this embodiment, the frame 319 formed by the bent portion 318 of the back plate 310 can serve as a carrier, and the frame 319 can have a receiving groove 319a. The accommodating groove 319a can be used to place the circuit board 230 of the liquid crystal display device 200, and the circuit board 230 can be electrically connected to the peripheral circuit 212 of the liquid crystal display panel 210 through the flexible circuit board 240 or the flexible flip chip substrate (COF). To drive the liquid crystal display panel 210. It should be noted that the frame 319 can be a flat plate, that is, the frame 319 can be used to carry the circuit board 230 without bending the receiving groove 319a.

In the liquid crystal display device 200 of the present embodiment, since the back plate 310 of the backlight module 300 itself has the frame body 319, it is not necessary to additionally solder the frame body to the side wall 314 of the back plate 310, thereby saving welding time and thereby improving the backlight. The production efficiency of the module 300. In addition, since the frame 319 is integrally formed with other components of the backing plate 310 (such as the bottom 312, the side walls 314, and the top 316), it has better structural strength. In this way, it is possible to improve the problem that the structural strength of the welded joint is relatively weak due to the conventional technique using the welding method. Based on the above, the liquid crystal display device 200 and the backlight module 300 of the present embodiment have better reliability and production efficiency.

It should be noted that in the present invention, the frame body 319 formed by the bent portion 318 of the back plate 310 can serve as a lock frame in addition to the carrier. An embodiment in which the frame body is a lock frame will be described below with reference to FIG. In addition, in the present invention, the bent portion 318 of the back plate 310 may form a plurality of frames, and the frame may include a carrier, a lock frame, and the like.

3 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention. Referring to FIG. 3, the liquid crystal display device 200a of the present embodiment is similar to the liquid crystal display device 200 of FIG. 2. The difference is that the backplane 310' used by the backlight module 300a of the liquid crystal display device 200a is different from the backplane 310 of FIG. . In more detail, the frame body 319' formed by the bent portion 318' of the back plate 310' is a lock frame, and the frame body 319' has at least one locking hole 319b. The locking hole 319b of the frame 319' can be secured by a locking member (e.g., a screw) to secure the frame 319' to other components (e.g., the housing) through the locking member.

4 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention. Referring to FIG. 4, the liquid crystal display device 200b of the present embodiment is similar to the liquid crystal display device 200a of FIG. 3, and the difference is that the partial frame 360 of the backlight module 300b of the liquid crystal display device 200b is disposed in the light source accommodating space S2, and The portion of the frame 360 disposed in the light source accommodating space S2 is coupled to the top portion 316 of the back plate 310', wherein the bonding is preferably performed by bonding between the light guide plate 330 and the top portion 316 of the back plate 310'. . Specifically, the frame 360 may have four side walls arranged along four sides of the rectangular track, or three side walls arranged along three sides of the rectangular track, that is, the side walls of the frame 360 may be along four of the liquid crystal display panels 210 or One of the three side edges is disposed, and one of the side walls of the frame 360 is disposed, for example, in the light source accommodating space S2. A portion of the frame 360 disposed in the light source accommodating space S2 is adhered to the top portion 316 of the back plate 310' through the double-sided tape. In addition, a portion of the liquid crystal display panel 210 can be adhered to the bent portion 318 of the back sheet 310' through a double-sided tape or other adhesive material. In addition, the backlight module 300b may further include a buffer sheet 370 disposed between the frame 360 and the light guide plate 330. The material of the buffer sheet 370 may be a sponge, a rubber, a foaming material or other material capable of providing a buffering function, and the buffer sheet 370 may also have a reflecting function material, such as polyethylene terephthalate. Alcohol ester (PET), polycarbonate (PC) or the like allows light to be reflected and recovered to the light guide plate 330 via the buffer sheet 370.

In this embodiment, the partial frame 360 disposed in the light source accommodating space S2 is abutted between the light guide plate 330 and the top 316 of the back plate 310', and is bonded to the top 316 of the back plate 310'. When the pressure F is applied to the frame 319' during the handling of the liquid crystal display panel 200b or due to other factors, the partial frame 360 adhered to the top 316 of the back plate 310' can provide a considerable degree of resistance while preventing The top portion 316 and the bent portion 318 are lifted. In this way, the backplane 310' of the backlight module 300b can be prevented from being deformed, and the other components of the backlight module 300b are loosened. Therefore, the liquid crystal display device 200b of the present embodiment and the backlight module 300b thereof have better reliability.

FIG. 5 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention. Referring to FIG. 5, the liquid crystal display device 200c of the present embodiment is similar to the liquid crystal display device 200a of FIG. 3. The difference is that the backlight module 300c of the liquid crystal display device 200c includes the buffer sheet 380, and does not include the frame 360 of FIG. The buffer sheet 380 is disposed between the partial liquid crystal display panel 210 and the bent portion 318 of the back sheet 310'. The buffer sheet 380 can be bonded to the bent portion 318 of the liquid crystal display panel 210 and the back sheet 310' through a double-sided tape or other adhesive material. In addition, the material of the buffer sheet 380 may be a sponge, a foaming material, a rubber or other material capable of providing a cushioning function.

6 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention. Referring to FIG. 6, the liquid crystal display device 200d of the present embodiment is similar to the liquid crystal display device 200a of FIG. 3. The difference is that the backlight module 300d of the liquid crystal display device 200d omits the frame 360 of the backlight module 300a of FIG. In the liquid crystal display device 200d, a part of the liquid crystal display panel 210 is adhered to the bent portion 318 of the back plate 310' through a double-sided tape or other adhesive material.

It should be noted that, in the liquid crystal display devices 200b-200d disclosed in FIG. 4 to FIG. 6, the back plate 310' can be replaced with the back plate 310 disclosed in FIG. 2, or has a lock frame and a carrier at the same time. The back of the frame.

In summary, in the present invention, since the back plate of the backlight module has a bent portion and the bent portion extends to the outside of the side wall to form a frame body, there is no need to additionally weld the frame body. In this way, the welding time can be saved and the structural strength of the welded joint can be avoided. Therefore, the backlight module using the back sheet of the present invention and the liquid crystal display device using the same have better reliability and assembly efficiency.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and it is intended to be a part of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100, 200, 200a, 200b, 200c, 200d. . . Liquid crystal display device

110, 210. . . LCD panel

112, 212. . . Peripheral circuit

120, 300, 300a, 300b, 300c, 300d. . . Backlight module

121, 310, 310’. . . Backplane

121a, 312. . . bottom

121b, 314. . . Side wall

121c, 316. . . top

122, 320. . . light source

122a, 322. . . Substrate

122b. . . Light-emitting diode

123,330. . . Light guide

123a, 332. . . Glossy surface

123b, 334. . . Glossy surface

124, 340. . . A reflective sheet

125, 350. . . Optical film

126, 360. . . frame

127. . . Carrier

132, 230. . . Circuit board

134, 240. . . Flexible circuit board

318, 318’. . . Bending section

319, 319’. . . Frame

319a. . . Locating slot

319b. . . Locking hole

324. . . point Light

370,380. . . Buffer sheet

F. . . pressure

S1, S2. . . Light source accommodation space

1 is a partial cross-sectional view showing a conventional liquid crystal display device.

2 is a partial cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention.

3 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention.

4 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention.

6 is a partial cross-sectional view showing a liquid crystal display device according to another embodiment of the present invention.

200. . . Liquid crystal display device

210. . . LCD panel

212. . . Peripheral circuit

230. . . Circuit board

240. . . Flexible circuit board

300. . . Backlight module

310. . . Backplane

312. . . bottom

314. . . Side wall

316. . . top

318. . . Bending section

319. . . Frame

319a. . . Locating slot

320. . . light source

322. . . Substrate

324. . . point Light

330. . . Light guide

332. . . Glossy surface

334. . . Glossy surface

340. . . A reflective sheet

350. . . Optical film

360. . . frame

S2. . . Light source accommodation space

Claims (26)

A backlight module includes: a back plate having a bottom, a side wall, a top portion and at least one bent portion, the side wall being connected between the top portion and the bottom portion, the top portion being opposite to a portion of the bottom portion, and the top portion a light source accommodating space is formed between the bottom portion and the inner side of the side wall, the bent portion is connected to an end of the top portion away from the side wall, and is bent toward the side wall, and the bent portion extends to the side wall An outer side of the side wall defines a body; a light source disposed in the light source accommodating space; and a light guide plate disposed at the bottom, and a light incident surface of the light guide plate is opposite to the light source. The backlight module of claim 1, wherein the rack system has a carrier, and the carrier has a receiving slot. The backlight module of claim 1, wherein the frame system is a locking frame, and the locking frame has at least one locking hole. The backlight module of claim 1, wherein a part of the light guide plate is located in the light source accommodating space. The backlight module of claim 4, further comprising a frame, the frame being disposed in the light source accommodating space and abutting between the light guide plate and the top of the back plate, wherein a portion thereof The frame is combined with the top of the backing plate. The backlight module of claim 5, further comprising a buffer sheet disposed between the frame and the light guide plate. The backlight module of claim 1, further comprising a reflective sheet disposed between the light guide plate and the bottom of the back plate. The backlight module of claim 1, further comprising at least one optical film disposed on a light emitting surface of the light guide plate. The backlight module of claim 1, further comprising a buffer sheet disposed on the bent portion of the back sheet. The backlight module of claim 1, further comprising a frame, wherein a part of the frame is disposed on the bent portion of the backboard. The backlight module of claim 1, wherein the bottom portion, the side wall, and the top portion are integrally formed with the bent portion. A liquid crystal display device includes: a liquid crystal display panel; and a backlight module disposed on one side of the liquid crystal display panel, the backlight module includes: a back plate having a bottom, a side wall, a top, and at least one a bent portion, the side wall is connected between the top portion and the bottom portion, the top portion is opposite to a portion of the bottom portion, and a light source accommodating space is formed between the top portion, the bottom portion and the inner side of the side wall, and the bent portion is connected to the top portion An end of the side wall is bent away from the side wall, and the bent portion extends to the outside of the side wall to form a frame on the outer side of the side wall; a light source disposed in the light source accommodating space And a light guide plate disposed at the bottom, and a light incident surface of the light guide plate is opposite to the light source. The liquid crystal display device of claim 12, wherein the rack system has a carrier, and the carrier has a receiving slot. The liquid crystal display device of claim 13, further comprising: a circuit board disposed in the receiving slot of the carrier; and a flexible circuit board electrically connected to the circuit board and the liquid crystal Display panel. The liquid crystal display device of claim 12, wherein the frame system is a locking frame, and the locking frame has at least one locking hole. The liquid crystal display device of claim 12, wherein a part of the light guide plate is located in the light source accommodating space. The liquid crystal display device of claim 16, wherein the backlight module further comprises a frame, and the frame is disposed in the light source accommodating space and abuts the light guide plate and the top of the back plate Between the parts, the frame is combined with the top of the backing plate. The liquid crystal display device of claim 17, wherein the backlight module further comprises a buffer sheet disposed between the frame and the light guide plate. The liquid crystal display device of claim 12, wherein the backlight module further comprises a reflective sheet disposed between the light guide plate and the bottom of the back plate. The liquid crystal display device of claim 12, wherein the backlight module further comprises at least one optical film disposed on a light emitting surface of the light guide plate. The liquid crystal display device of claim 12, wherein a portion of the liquid crystal display panel is adhered to the bent portion of the back sheet. The liquid crystal display device of claim 12, wherein the backlight module further comprises a buffer sheet disposed between the portion of the liquid crystal display panel and the bent portion of the back sheet. The liquid crystal display device of claim 12, wherein the backlight module further comprises a frame for carrying the liquid crystal display panel, wherein a part of the frame is disposed on the bent portion of the back plate. The liquid crystal display device of claim 12, wherein the bottom portion, the side wall, the top portion and the bent portion are integrally formed. A back panel of a backlight module has a bottom portion, a side wall, a top portion and at least one bent portion connected between the top portion and the bottom portion, the top portion being opposite to a portion of the bottom portion, and the top portion and the bottom portion Forming a light source accommodating space between the inner side of the side wall, the bent portion connecting one end of the top portion away from the side wall, and bending toward the side wall, and the bending portion extends to the outer side of the side wall to A frame is formed on the outside of the side wall. The back sheet of claim 25, wherein the bottom portion, the side wall, and the top portion are integrally formed with the bent portion.