TWI623798B - Plastic frame, backlight module, and flat panel display device using the same - Google Patents

Abstract

The invention relates to a plastic frame, a backlight module and a flat display device using the same. The backlight module includes a plastic frame, a light emitting diode and a light guide plate. The light emitting diode has a light emitting surface and a second surface opposite to the light emitting surface. The light emitting surface abuts the incident surface of the light guide plate, and the plastic frame includes the first saw tooth. a first frame and a second frame having a second serration, the first frame and the second frame are meshed with the second serration by the first serration and the second serration to form an accommodation space, and the light guide plate and the LED are disposed on In the accommodating space, the connection depth between the first dent portion and the second dent portion is adjusted such that the second surface abuts against the first frame.

Description

Plastic frame, backlight module and flat display device using same

The invention relates to a plastic frame, a backlight module and a flat display device using the same, in particular to a plastic frame, a backlight module and a flat display device using the same.

The fabrication technology of liquid crystal display devices (LCD devices) has rapidly developed in recent years, and the liquid crystal display devices have made great progress in terms of image quality, reaction rate, and panel size. And because of its small size, light weight, power saving and low radiation, LCD display devices are widely used in notebook computers, digital cameras, digital video cameras, mobile phones, computer screens and LCD TVs. In various electronic products. However, since the liquid crystal display panel in the liquid crystal display device is a non-self-luminous display panel, it is necessary to provide a light source by a backlight module to generate a display screen.

Please refer to FIG. 1. FIG. 1 is a partial cross-sectional view showing a liquid crystal display device of the prior art. The liquid crystal display device 10 includes a liquid crystal panel 11, a back frame 12, a plastic frame 13, a light guide plate 14, a flexible circuit board 15, a light-emitting diode 16, and a glue. Belt 17 and optical diaphragm 18. The back frame 12, the plastic frame 13, the light guide plate 14, the flexible circuit board 15, the light-emitting diode 16, the tape 17, and the optical film 18 are assembled into a backlight module, and the plastic frame 13 is placed in the back frame 12, and the light guide plate 14 is placed. In the plastic frame 13, the light-emitting diode 16 is electrically connected to the flexible circuit board 15, and the flexible circuit board 15 is fixed to the upper surface of the light guide plate 14 by the tape 17, and then the light-emitting diode 16 is abutted against the incident surface of the light guide plate 14. The light emitted from the light emitting diode 16 is directed to the incident surface of the light guide plate 14.

Since the flexible circuit board 15 is fixed by the tape 17, when the adhesive tape 17 is subjected to environmental influences and the viscosity is lowered or arched, the flexible circuit board 15 may be lifted from the upper surface of the light guide plate 14, and the light-emitting diode 16 may be present. Fixedly connected to the flexible circuit board 15, there is a gap g between the light-emitting diode 16 itself and the plastic frame 13. Once the flexible circuit board 15 is lifted, the position of the light-emitting diode 16 in each direction is no longer stable. Then, the light emitted from the LEDs 16 is not directly incident into the light guide plate 14, thereby reducing the luminous efficiency and quality of the LEDs 16, and affecting the stability of the backlight module.

In order to solve the above problems, the present invention provides a plastic frame, a backlight module, and a flat display device that can adjust a plastic frame accommodation space by a sawtooth portion.

In order to achieve the above object, the present invention provides a plastic frame including a first frame and a second frame, the first frame has a first serration, and the second frame has a second serration, the first frame and the second The frame is meshed with the second serration portion by the first serration portion to form an accommodation space, and is adjusted a depth of connection between the first serration and the second serration to adjust the size of the accommodation space.

In an optional technical solution, the first serration portion includes a plurality of first serrations, the first serration has a first opening angle, the second serration portion includes a plurality of second serrations, and the second serration has a second opening angle, wherein the second serration has a second opening angle, wherein The first opening angle is greater than the second opening angle, and the plurality of first saw teeth are interlaced with the plurality of second saw teeth.

As an optional technical solution, the first sawtooth portion has a protrusion having opposite first side edges and second side edges, and a plurality of third saw teeth are formed on the second side edge, the second sawtooth a recess having a corresponding convex portion, the recess having opposite third sides and a fourth side, a plurality of fourth saw teeth formed on the fourth side, the protrusion being inserted in the recess At least a portion of the plurality of third saw teeth mesh with the fourth sawtooth.

The plastic frame of the present invention is a two-piece structure having a first frame and a second frame, and a first sawtooth portion is disposed on the first frame, and a second sawtooth portion is disposed on the second frame. The first serration portion is engaged with the second serration portion to form an accommodation space, and the size of the accommodation space is adjusted by adjusting the connection depth of the first serration portion and the second serration portion.

In addition, the present invention provides a backlight module including a plastic frame, a light emitting diode, and a light guide plate. The light emitting diode has a light emitting surface and a second surface opposite to the light emitting surface, and the light emitting surface abuts the light emitting surface An entrance surface of the light guide plate, the plastic frame includes a first frame and a second frame, the first frame has a first sawtooth portion, and the second frame has a second sawtooth portion, the first frame and the second frame pass The first serration is engaged with the second serration Forming an accommodating space, the light guide plate and the light emitting diode are disposed in the accommodating space, and adjusting a connection depth between the first dent portion and the second dent portion, the second surface abutting the first frame .

In an optional technical solution, the first serration portion includes a plurality of first serrations, the first serration has a first opening angle, the second serration portion includes a plurality of second serrations, and the second serration has a second opening angle, wherein the second serration has a second opening angle, wherein The first opening angle is greater than the second opening angle, and the plurality of first saw teeth are interlaced with the plurality of second saw teeth.

In an optional technical solution, the first serration has a protrusion having opposite first sides and second sides, and a plurality of third serrations are formed on the first side, the second serration a notch corresponding to the protrusion, the notch having opposite third sides and a fourth side, a plurality of fourth saw teeth formed on the third side, the protrusion being inserted in the notch, the protrusion a plurality of third serrations meshing with the plurality of fourth serrations; or the first serrations having protrusions having opposite first sides and second sides, a plurality of third serrations formed on the The second serrations have corresponding recesses, the recesses have opposite third sides and fourth sides, and a plurality of fourth serrations are formed on the fourth sides. A projection is inserted into the recess, and the plurality of third serrations engage the plurality of fourth serrations.

As an optional technical solution, the first sawtooth portion has a protrusion having opposite first side edges and second side edges, and a plurality of third saw teeth are formed on the first side edge and the second side edge The second serration has a corresponding recess, the recess has opposite third sides and a fourth side, and the plurality of fourth serrations are formed on the third side and the fourth side The bulge Inserted into the recess, the plurality of third saw teeth mesh with the plurality of fourth saw teeth.

As an optional technical solution, the light emitting diode is electrically connected to a flexible circuit board, and the flexible circuit board abuts the exit surface of the light guide plate.

As an optional technical solution, the plastic frame has a bearing surface on which a light shielding tape is attached.

The backlight module of the present invention utilizes a two-piece plastic frame structure having a first sawtooth portion and a second sawtooth portion, and the adjustment of the assembly ensures that the light-emitting surface of the light-emitting diode momentarily abuts the incident surface of the light guide plate, thereby The luminous efficiency and quality of the light-emitting diode are ensured, the structure and optical stability of the backlight module are improved, and the structure is simple and easy to assemble.

In addition, the present invention further provides a flat display device including a backlight module, the backlight module includes a plastic frame, a light emitting diode, and a light guide plate, and the light emitting diode has a light emitting surface and is opposite to the light emitting surface. a second surface, the light emitting surface abuts the incident surface of the light guide plate, the plastic frame includes a first frame and a second frame, the first frame has a first saw tooth portion, and the second frame has a second saw tooth portion. The first frame and the second frame are coupled to the second serration by the first serration and the second serration. The light guide plate and the LED are disposed in the accommodating space, and the first serration is adjusted. The depth of the connection between the portion and the second serration is such that the second surface abuts the first frame.

In an optional technical solution, the first serration portion includes a plurality of first serrations, the first serration has a first opening angle, the second serration portion includes a plurality of second serrations, and the second serration has a second opening angle, wherein the second serration has a second opening angle, wherein First The opening angle is greater than the second opening angle, and the plurality of first saw teeth are interlaced with the plurality of second saw teeth.

In an optional technical solution, the first serration has a protrusion having opposite first sides and second sides, and a plurality of third serrations are formed on the first side, the second serration a notch corresponding to the protrusion, the notch having opposite third sides and a fourth side, a plurality of fourth saw teeth formed on the third side, the protrusion being inserted in the notch, the protrusion a plurality of third serrations meshing with the plurality of fourth serrations; or the first serrations having protrusions having opposite first sides and second sides, a plurality of third serrations formed on the The second serrations have corresponding recesses, the recesses have opposite third sides and fourth sides, and a plurality of fourth serrations are formed on the fourth sides. A projection is inserted into the recess, and the plurality of third serrations engage the plurality of fourth serrations.

As an optional technical solution, the first sawtooth portion has a protrusion having opposite first side edges and second side edges, and a plurality of third saw teeth are formed on the first side edge and the second side edge The second serration has a corresponding recess, the recess has opposite third sides and a fourth side, and the plurality of fourth serrations are formed on the third side and the fourth side The protrusion is inserted into the recess, and the plurality of third saw teeth are engaged with the plurality of fourth saw teeth.

As an optional technical solution, the light emitting diode is electrically connected to a flexible circuit board, and the flexible circuit board abuts the exit surface of the light guide plate.

As an optional technical solution, the plastic frame has a bearing surface on which a light shielding tape is attached.

The flat display device of the present invention utilizes a two-piece plastic frame structure having a first serration portion and a second serration portion, and the adjustment of the assembly ensures that the light-emitting surface of the light-emitting diode momentarily abuts against the incident surface of the light guide plate, thereby The luminous efficiency and quality of the light-emitting diode are ensured, the structure and optical stability of the backlight module are improved, and the structure is simple and easy to assemble.

The invention is described in detail below with reference to the accompanying drawings and specific embodiments.

10‧‧‧Liquid crystal display device

11‧‧‧LCD panel

12‧‧‧ Back frame

13‧‧‧ plastic frame

14‧‧‧Light guide plate

15‧‧‧Soft circuit board

16‧‧‧Lighting diode

17‧‧‧ Tape

18‧‧‧Optical diaphragm

100‧‧‧Backlight module

200‧‧‧ plastic frame

210‧‧‧ first frame

211‧‧‧First Sawtooth

212‧‧‧First sawtooth

218‧‧‧ inside

220‧‧‧second framework

221‧‧‧second sawtooth

222‧‧‧second sawtooth

230‧‧‧ accommodating space

240‧‧‧Meshing area

250‧‧‧ bearing surface

200’‧‧‧ plastic frame

210’‧‧‧First Framework

211’‧‧‧First Sawtooth

212'‧‧‧ third sawtooth

213’‧‧‧ first side

214’‧‧‧ second side

215’‧‧‧ bumps

220’‧‧‧second framework

221’‧‧‧Second serrated

222’‧‧‧ fourth sawtooth

223’‧‧‧ third side

224’‧‧‧ fourth side

225’‧‧‧ Notch

240'‧‧‧Meshing area

300‧‧‧Light guide plate

310‧‧‧Incoming surface

400‧‧‧Lighting diode

410‧‧‧Lighting surface

420‧‧‧ second surface

500‧‧‧Soft circuit board

510‧‧‧ Tape

600‧‧‧Optical diaphragm

610‧‧‧Lighting tape

700‧‧‧ Back frame

800‧‧‧ display panel

1000‧‧‧Flat display device

G‧‧‧ gap

A‧‧‧first corner

B‧‧‧second corner

D‧‧‧Width

G‧‧‧Distance

1 is a partial cross-sectional view of a prior art liquid crystal display device; FIG. 2 is a plan view of a plastic frame according to the present invention; FIG. 3A is a partial front view of an embodiment of the plastic frame of the present invention; 4A is a partial front view of another embodiment of the plastic frame of the present invention; FIG. 4B is a partial perspective view of another embodiment of the plastic frame of the present invention; FIG. FIG. 5B is a plan view of the backlight module of the present invention when it is assembled; FIG. 6 is a partial front view of the backlight module of the present invention; and FIG. 7 is a partial front elevational view of the flat display device of the present invention.

Please refer to FIG. 2, FIG. 3A and FIG. 3B, FIG. 2 is a plastic frame of the present invention. 3A is a partial front view of an embodiment of a plastic frame according to the present invention; and FIG. 3B is a partial perspective view of an embodiment of the plastic frame of the present invention. The plastic frame 200 includes a first frame 210 and a second frame 220. The first frame 210 has a first serration 211 and the second frame 220 has a second serration 221 thereon. The first frame 210 and the second frame 220 are meshed with the second serration 221 by the first serration 211 to form the accommodating space 230, and the connection depth of the first serration 211 and the second serration 221 is adjusted to adjust the accommodating. The size of the space 230. The hatched area in FIG. 2 shows the meshing area 240 of the first serration 211 and the second serration 221 .

As shown in FIG. 3A and FIG. 3B, the first serration 211 includes a plurality of first serrations 212, the first serration 212 has a first opening angle A, the second serration 221 includes a plurality of second serrations 222, and the second serrations 222 have a second corner B, wherein the first opening angle A is greater than the second opening angle B, and the plurality of first saw teeth 212 are interlaced with the plurality of second saw teeth 222, and can be adjusted by adjusting the depth of engagement between the first sawtooth 212 and the second sawtooth 222 The size of the accommodation space 230. In the actual operation, when the accommodating space 230 is too large, the external force of the opposing direction is applied to the first frame 210 and the second frame 220 at the same time. Since the plastic frame 200 can be deformed to a certain extent, the external force is applied. The degree of engagement of the first serration 212 with the second serration 222 is gradually deepened until the accommodation space 230 reaches the desired size.

4A and FIG. 4B, FIG. 4A is a partial front elevational view of another embodiment of the plastic frame of the present invention; and FIG. 4B is a partial perspective view of another embodiment of the plastic frame of the present invention. In this embodiment, the first serration 211' on the first frame 210' has a protrusion 215' having an opposite first side 213' and a second side 214', a plurality of third serrations 212' are formed on the second side 214', the second serration 221' has a recess 225' corresponding to the protrusion 215', and the recess 225' has an opposite The three sides 223' and the fourth side 224', the plurality of fourth saw teeth 222' are formed on the fourth side 224', the protrusion 215' is inserted in the recess 225', at least part of the plurality of third The serration 212' is engaged with the fourth serration 222' such that the shape of the bezel 200' is stabilized, and the connection depth of the projection 215' and the recess 225' is adjusted to adjust the size of the accommodation space. In actual operation, due to the cooperation of the third serration 212' and the fourth serration 222', when the plastic frame 200' is assembled, if no external force is applied, the plastic frame 200' can maintain its own stable and firm, and generally, the third serration 212' is covered with the entire side of the second side 214', and the fourth sawtooth 222' is covered with the entire side of the fourth side 224'.

In actual operation, when the accommodating space 230 is too large, the external force in the opposite direction is simultaneously applied to the first frame 210' and the second frame 220', respectively, because the plastic frame 200' can be deformed to a certain extent, so that The degree of connection between the serration 211' and the second serration 221' is gradually deepened until the accommodation space 230 reaches the desired size. Of course, when the accommodating space 230 is small, the external force of the opposite direction is continuously applied to the first frame 210 ′ and the second frame 220 ′, so that the degree of connection between the first dent portion 211 ′ and the second dent portion 221 ′ is gradually changed. Shallow until the accommodating space 230 reaches the desired size.

In this embodiment, the third sawtooth 212' is formed only on one side of the second side 214'. In actual operation, the third sawtooth 212' may also be formed on the first side 213', corresponding to a plurality of The mated fourth saw teeth 222' are formed on the third side 223'. Of course, the user can also form the third sawtooth 212' only on the first side 213', while the fourth sawtooth 222' is formed only correspondingly. The third side 223' can be determined by the user according to actual needs, and is not limited thereto.

5A and 5B, FIG. 5A is a top view of the backlight module of the present invention in an assembly process; and FIG. 5B is a top view of the backlight module of the present invention when the assembly is completed. The backlight module 100 includes the plastic frame 200, the light guide plate 300, and the plurality of light emitting diodes 400. The light emitting diode 400 has a light emitting surface 410 and a second surface 420 opposite to the light emitting surface 410. The light emitting surface 410 When the backlight module 100 is assembled against the incident surface 310 of the light guide plate 300, after the light guide plate 300 and the plurality of light emitting diodes 400 are placed in the accommodating space 230, the first dent portion 211 and the second dent portion 221 are adjusted. The depth is connected such that the second surface 420 abuts against the first frame 210.

As shown in FIG. 5A, when the light guide plate 300 and the light emitting diode 400 are placed in the accommodating space 230, the width of the meshing region 240 is D, and the second surface 420 of the light emitting diode 400 and the first frame 210 are Since the distance between the inner sides 218 is G, it is necessary to adjust the connection depth of the first serrations 211 and the second serrations 221 . As shown in FIG. 5B, when the backlight module is assembled, the second surface 420 abuts against the inner side 218 of the first frame 210, that is, the distance between the second surface 420 and the inner side 218 of the first frame 210 is 0, and the meshing area The width of the 240 is G+D. By adjusting the connection depth of the first serration 211 and the second serration 221, the size of the accommodating space 230 is adjusted, and the final purpose is to cause the illuminating diode 400 to be clamped to Between the first frame 210 and the light guide plate 300, the position of the light-emitting diode 400 is limited, and the light emitted from the light-emitting diode 400 is directly incident into the light guide plate 300.

Please refer to FIG. 6. FIG. 6 is a partial front view of the backlight module of the present invention. Figure. As shown in FIG. 6 , the backlight module 100 further has a flexible circuit board 500 . The plurality of LEDs 400 are electrically connected to the flexible circuit board 500 . The light guide plate 300 has an exit surface 320 , and the flexible circuit board 500 abuts the light guide plate 300 . Exit surface 320. In actual operation, in order to make the flexible circuit board 500 more firmly abut against the light guide plate 300, the flexible circuit board 500 and the light guide plate 300 may be bonded and fixed by using the tape 510.

The backlight module 100 further includes a plurality of optical films 600. The plurality of optical films 600 are placed on the exit surface 320 of the light guide plate 300. The plurality of optical films 600 may include a lower prism sheet, a lower diffusion sheet, and an upper prism sheet. The optical film 600 can make the light emitted from the exit surface 320 of the light guide plate 300 more uniform, and the user can select the number and type of the optical film according to actual needs.

The plastic frame 200 has a bearing surface 250 on which a light shielding tape 610 is attached. The bearing surface 250 is used to carry the display panel thereon, so the bearing surface 250 is generally a full-circle structure, and the light-shielding tape 610 covers the bearing surface 250, and the bearing at the meshing area 240 of the first sawtooth portion 211 and the second sawtooth portion 221 The surface is also covered, and the light-shielding tape 610 fixes the first frame 210 and the second frame 220 here, that is, the light-shielding tape 610 can further enhance the structural stability of the plastic frame 200 at the meshing area 240.

In this embodiment, the light-shielding tape 610 is attached along the bearing surface 250 for a whole circumference, and the width of the light-shielding tape 610 is greater than the width of the bearing surface 250, so that part of the light-shielding tape 610 is applied across the edge of the optical film 600, so that The optical leakage from the gap between the optical film 600 and the plastic frame 200 can be avoided, the light utilization efficiency of the light emitting diode 400 is ensured, and the backlight module 100 is improved. Optical quality. In actual operation, the user does not necessarily attach the light-shielding tape 610 to the bearing surface 250 of the four sides. It is considered that the light-shielding tape 610 is attached only to the side where the light-emitting diode 400 is located, depending on the actual situation of the user. Not limited to this.

In the actual operation, the backlight module 100 can further include a back frame 700, and the back frame 700 houses the plastic frame 200 therein.

In addition, the present invention also provides a flat display device 1000 including the backlight module 100. Please refer to FIG. 7. FIG. 7 is a partial front elevational view of the flat display device of the present invention. The flat display device 1000 includes a backlight module 100 and a display panel. 800, the display panel 800 is placed in the backlight module 100, and is in contact with the light-shielding tape 610. The light-shielding tape 610 is generally a black double-sided tape, so that the structure of the plastic frame 200 at the meshing area 240 can be further enhanced and stabilized. In addition, the display panel 800 can also be fixed on the backlight module 100 to prevent foreign matter from entering the interior of the flat display device 1000.

The plastic frame of the present invention is a two-piece structure having a first frame and a second frame, and a first sawtooth portion is disposed on the first frame, and a second sawtooth portion is disposed on the second frame. The first serration portion is engaged with the second serration portion to form an accommodation space, and the size of the accommodation space is adjusted by adjusting a connection depth of the first serration portion and the second serration portion.

The backlight module and the flat display device of the present invention use the two-piece plastic frame structure having the first sawtooth portion and the second sawtooth portion, and the adjustment of the assembly can ensure that the light-emitting surface of the light-emitting diode momentarily abuts the light guide plate. The incident surface ensures the luminous efficiency and quality of the light-emitting diode, improves the structure and optical stability of the backlight module, and has a simple structure and is easy to assemble.

There are a variety of other modifications and variations that can be made by those skilled in the art without departing from the spirit and scope of the invention. All should fall within the scope of protection of the claims attached to the present invention.

Claims (7)

A plastic frame comprising: a first frame having a first serration portion, the first serration portion having a protrusion having opposite first side edges and a second side edge, the plurality of third serrations being formed on the first a second side, and a second frame having a second serration having a corresponding recess, the recess having opposite third and fourth sides, a plurality of fourth a serration is formed on the fourth side, and the first frame and the second frame are directly in contact with the second serration by the first serration and the second serration is formed into an accommodating space, and the protrusion is inserted into the recess. At least a portion of the plurality of third saw teeth are engaged with the fourth sawtooth, and a connection depth of the first sawtooth portion and the second sawtooth portion is adjusted to adjust a size of the accommodating space. The plastic frame according to claim 1, wherein the first serration portion includes a plurality of first serrations, the first serration has a first opening angle, and the second serration portion includes a plurality of second serrations, the second serration having a Two corners, wherein the first opening angle is greater than the second opening angle, and the plurality of first saw teeth are interlaced with the plurality of second saw teeth. A backlight module includes a plastic frame, a light emitting diode, and a light guide plate. The light emitting diode has a light emitting surface and a second surface opposite to the light emitting surface, and the light emitting surface abuts the incident surface of the light guide plate, and is characterized in that The plastic frame includes a first frame and a second frame, the first frame has a first sawtooth portion, and the second frame has a second sawtooth portion, the first frame The accommodating space is formed by the first frame-shaped portion and the second dent portion being in direct contact with the second frame. The light-guiding plate and the light-emitting diode are disposed in the accommodating space, and the first dent portion is adjusted. The second serration is connected to the second surface against the first frame; the first serration has a protrusion having opposite first and second sides, and a plurality of third The serrations are formed on the first side, the second serrations have corresponding recesses, the recesses have opposite third sides and fourth sides, and a plurality of fourth serrations are formed on the third side On the side, the protrusion is inserted into the recess, and the plurality of third saw teeth are engaged with the plurality of fourth saw teeth; or the first sawtooth portion has a protrusion having an opposite first side and a second side, a plurality of third serrations formed on the second side, the second serration having a corresponding convex recess, the recess having opposite third and fourth sides, the plurality Four fourth serrations are formed on the fourth side, the protrusions are inserted in the notches, a plurality of third serrations meshing with the plurality of fourth serrations; or the first serrations having protrusions having opposite first sides and second sides, a plurality of third serrations formed on the On one side and the second side, the second serration has a corresponding recess, the recess has opposite third and fourth sides, and a plurality of fourth serrations are formed on the first The three sides and the fourth side are inserted into the recess, and the plurality of third saw teeth are engaged with the plurality of fourth saw teeth. The backlight module of claim 3, wherein the first sawtooth portion a plurality of first saw teeth, the first saw tooth having a first opening angle, the second saw tooth portion comprising a plurality of second saw teeth, the second saw tooth having a second opening angle, wherein the first opening angle is greater than the second opening angle, A plurality of first saw teeth are interleaved with the plurality of second saw teeth. The backlight module of claim 3, wherein the light emitting diode is electrically connected to a flexible circuit board, and the flexible circuit board abuts the exit surface of the light guide plate. The backlight module of claim 3, wherein the plastic frame has a bearing surface on which a light shielding tape is attached. A flat display device, characterized in that the flat display device includes the backlight module of any one of the claims 3 to 6.