CN101726788B - Light guide plate, backlight module, liquid crystal display device and electrical equipment - Google Patents

Abstract

A light guide plate includes first, second and third receiving spaces. The first accommodating space is used for fixing a liquid crystal panel. The second accommodating space is used for configuring an optical film group. The third accommodating space is used for configuring a light source unit. The first, second and third containing spaces of the light guide plate can replace the containing functions of the back shell and the rubber frame of the known backlight module, and directly contain the liquid crystal panel, the optical film group and the light source unit on the light guide plate, so the back shell and the rubber frame can be eliminated, and the thickness of the backlight module can be thinned. Meanwhile, the design of the clamping hook can be eliminated, so that the backlight module can be assembled more simply and at lower cost, and the automation of the backlight module can be introduced.

Description

Light guide plate, backlight module, liquid crystal display device and electrical equipment

technical field

The present invention relates to a liquid crystal display device, more particularly to a backlight module, the functions of the first, second and third accommodating spaces of the light guide plate can directly connect the liquid crystal panel, the optical film group And the light source unit is placed on the light guide plate.

Background technique

With the advancement of electronic technology, especially the popularity of portable electronic products in daily life, there is an increasing demand for displays that are thin, light, small, and low in power consumption. Liquid crystal display (Liquid Crystal Display; LCD) is often used in such electronic products due to its advantages of low power consumption, low heat generation, and light weight, and has gradually replaced traditional cathode ray tube displays.

Referring to FIG. 1 , a known liquid crystal display device 10 mainly includes a front frame 12 , a liquid crystal panel 14 and a backlight module 20 . The liquid crystal panel 14 has a liquid crystal layer (not shown) disposed between a pair of upper and lower substrates (not shown) for displaying images. The backlight module 20 is used to illuminate the liquid crystal panel 14 , and is combined with the front frame 12 to combine the liquid crystal panel 14 and the backlight module 20 into the liquid crystal display device 10 . The known liquid crystal display device further includes a printed circuit board (PCB) 16, which transmits control and driving signals to the liquid crystal panel 14 through a tape carrier package (TCP).

Referring to FIGS. 2 and 3 , the backlight module 20 includes a light guide plate 22 , a lamp light source (such as a cold cathode lamp 24 ) and a U-shaped reflector 26 . The U-shaped reflector 26 is installed on one side 21 of the light guide plate 22 and surrounds the lamp tube 24 . The opening 25 of the U-shaped reflector 26 faces the side 21 of the light guide plate 22 . A reflection sheet 28 is fixed on the bottom of the light guide plate 22 . An optical film set 30 , such as a plurality of diffusion sheets or prism sheets, is disposed on the light guide plate 22 for uniformly emitting light from the light guide plate 22 to the liquid crystal panel 14 . The backlight module 20 further includes a back shell 32 and a plastic frame 34, wherein the back shell 32 is combined with the plastic frame 34 to connect the light guide plate 22, the lamp tube 24, the U-shaped reflector 26, the optical film group 30 and The reflector 28 is fixed between the back cover 32 and the plastic frame 34 , so the backlight module 20 generally needs to be designed with hooks and other fixing methods when assembling, which not only consumes man-hours for manual assembly, but also often causes the problem of poor fitting of the hooks.

Therefore, there is a need to provide a backlight module capable of solving the aforementioned problems.

Contents of the invention

The invention provides a light guide plate, which includes a top surface, a first bottom surface, four first side surfaces, and first, second and third accommodating spaces. The first bottom surface is relative to the top surface. The first side connects the top surface and the first bottom surface. The first accommodating space is arranged on the top surface, and the first accommodating space includes four second sides, a first opening and a second bottom surface, wherein the second side connects the top surface and the second bottom surface, and the second side is adjacent to the first The side surfaces are arranged parallel to the first side surface, the second bottom surface is parallel to the top surface, and the first opening is arranged on the top surface. The second accommodating space is arranged on the second bottom surface, the second accommodating space includes four third sides, a second opening and a third bottom surface, the third side connects the second bottom surface and the third bottom surface, and the third side surface is adjacent to the first The two sides are arranged parallel to the second side, wherein the distance between the third side and the first side is greater than the distance between the second side and the first side, the third bottom is parallel to the second bottom, and the second opening is arranged on the second side. Two bases. The third accommodating space includes a third opening, and the third opening is at least located on one of the top surface, the first bottom surface and the first side surface.

Due to the functions of the first, second and third accommodating spaces of the light guide plate of the present invention, the accommodating functions of the back shell and the plastic frame of the known backlight module can be replaced, and the liquid crystal panel, the optical film group and the light source can be directly placed The unit is accommodated on the light guide plate, so the back cover and the plastic frame can be eliminated in the present invention, so that the thickness of the backlight module of the present invention can be reduced. At the same time, the design of the hook can be eliminated in the present invention, so that the assembly of the backlight module of the present invention can be simpler and the cost is lower, and it can be more automatically introduced into the backlight module.

In order to make the above and other objects, features, and advantages of the present invention more apparent, a detailed description will be given below with reference to the accompanying drawings.

Description of drawings

FIG. 1 is an exploded perspective view of a prior art liquid crystal display device.

FIG. 2 is an exploded perspective view of a backlight module in the prior art.

FIG. 3 is a partially enlarged schematic cross-sectional view of a backlight module in the prior art.

FIG. 4 is an exploded perspective view of a backlight module according to an embodiment of the present invention.

FIG. 5 is a partially enlarged schematic cross-sectional view of the backlight module of the present invention along the section line 5-5 in FIG. 4 .

6a and 6d are partially enlarged schematic cross-sectional views of the light guide plate according to the embodiment of the present invention.

FIG. 7 is a partially enlarged schematic cross-sectional view of a backlight module according to another embodiment of the present invention.

FIG. 8 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 9 is a partially enlarged schematic cross-sectional view of the liquid crystal display device of the present invention along the line 9-9 in FIG. 8 .

FIG. 10 is a three-dimensional exploded schematic diagram of an electrical device according to an embodiment of the present invention.

FIG. 11 is an exploded perspective view of an electrical device according to another embodiment of the present invention.

FIG. 12 is a partially enlarged schematic cross-sectional view of the electrical equipment along the section line 12-12 in FIG. 11 .

Explanation of reference signs

10 LCD display device 12 Front frame

14 LCD Panel 16 Printed Circuit Board

20 backlight module

21 side side 22 light guide plate

24 Lamp Tube 25 Opening

26 reflector 28 reflector

30 Optical film set 32 Back shell

34 Plastic frame 42 Side panels

100 Electrical equipment 102 Outer frame

110 Liquid crystal display device 112 Front frame

113 Through hole 114 LCD panel

120 Backlight module 122 Light guide plate

124 Light source unit 125 Heat sink

128 Reflector 130 Optical film set

150 Top 152 Bottom

154 Side 156 Side

157 screw hole 157’ through hole

158 screw 159 metal post

160 Accommodating space 160a Opening

161 accommodation space

162a Opening 162b Side

162c Bottom surface 163 Accommodating space

164a Open 164b Side

164c bottom surface 166 rubber strip

172 Visible area 174 Non-visible area

200 Electrical equipment 202 Outer frame

203 through hole

210 Liquid crystal display device 214 Liquid crystal panel

220 Backlight module 222 Light guide plate

228 Reflector 230 Optical film set

256 side

257 screw hole 257’ through hole

258 screw 259 metal post

272 Visible area 274 Non-visible area

S1 Plane S2 Plane

S3 plane

Detailed ways

Referring to FIGS. 4 and 5 , it shows a backlight module 120 according to an embodiment of the present invention. The backlight module 120 includes a light guide plate 122 , a light source unit 124 , an optical film set 130 and a reflector 128 . The light guide plate 122 has a top surface 150 , a first bottom surface 152 , two first side surfaces 154 and two first side surfaces 156 . The first bottom surface 152 is opposite to the top surface 150 , and the two first side surfaces 154 and the two first side surfaces 156 are connected to the top surface 150 and the first bottom surface 152 .

The light guide plate 122 includes a first accommodating space 163 disposed on the top surface 150 for fixing a liquid crystal panel. The first accommodating space 163 includes four second sides 164b, a first opening 164a and a second bottom surface 164c, wherein the second side 164b connects the top surface 150 and the second bottom surface 164c, and the second side 164b is adjacent to the first side 154 and arranged in parallel along the first side 154 . The second bottom surface 164c is parallel to the top surface 150 , and the first opening 164a is disposed on the top surface 150 .

The light guide plate 122 further includes a second accommodating space 161 disposed on the second bottom surface 164c. The second accommodating space 161 includes four third sides 162b, a second opening 162a and a third bottom 162c, the third side 162b connects the second bottom 164c and the third bottom 162c, and the third side 162b is adjacent to the second The side 164b is parallel to the second side 164b. The distance between the third side 162 b and the first side 154 is greater than the distance between the second side 164 b and the first side 154 . The third bottom surface 162c is parallel to the second bottom surface 164c, and the second opening 162a is disposed on the second bottom surface 162c. The optical film set 130 is disposed in the second accommodating space 161 of the light guide plate 122 .

The light guide plate 122 further includes a third accommodating space 160 , which includes a third opening 160 a, and the third opening 160 a is located at least on one of the top surface 150 , the first bottom surface 152 and the first side surface 154 . The light source unit 124 is disposed in the third accommodating space 160 of the light guide plate 122 . In this embodiment, there is only one third accommodating space 160 , so there is only one light source unit 124 . In another embodiment, there are multiple third accommodating spaces 160 , and there are multiple light source units 124 , and they are arranged in the third accommodating spaces 160 of the light guide plate 122 . In this embodiment, the light source unit 124 includes at least one LED light source, and includes a heat sink 125 . Referring to FIGS. 6 a to 6 d , the third opening 160 a of the third accommodating space 160 can be composed of two planes S1 , S2 or three planes S1 , S2 , S3 . Preferably, the third opening 160 a of the third accommodating space 160 is composed of two planes S1 and S2 , so that the heat dissipation effect of the heat sink 125 is optimal, as shown in FIG. 5 . The third accommodating space 160 can be located at the junction of the first bottom surface 152 and the first side surface 154 . Referring to FIG. 7 , in yet another embodiment, the light source unit 124 includes at least one lamp (such as a cold cathode lamp). Referring to FIGS. 6 a to 6 d again, the third opening 160 a of the third accommodating space 160 may be composed of three planes or two planes. Preferably, the third opening 160a of the third accommodating space 160 is composed of three planes, and its accommodating effect is optimal. The third accommodating space 160 can be located on the top surface 150 or the first bottom surface 152 , and is adjacent to the side surface 154 . Alternatively, the third accommodating space 160 may be located at the side 154 .

The reflective sheet 128 is used to cover the two first side surfaces 154, the two first side surfaces 156, the first bottom surface 152 and part of the top surface 150, so that the light source unit 124 can be fixedly sealed in the third accommodating space for the light source The light from the unit is effectively reflected in the light guide plate 122 and enters the optical film set 130 to illuminate the liquid crystal panel.

The light guide plate of the present invention can be integrally formed (such as cutting or injection molding) by general machining to form the first accommodating space 163, the second accommodating space 161 and the third accommodating space 160 for placing the liquid crystal panel , an optical film set 130 and a light source unit 124 (including cold cathode lamps and LED light sources).

Due to the functions of the first, second and third accommodating spaces of the light guide plate of the present invention, the accommodating functions of the back shell and the plastic frame of the known backlight module can be replaced, and the liquid crystal panel, the optical film group and the light source can be directly placed The unit is accommodated on the light guide plate, so the back cover and the plastic frame can be eliminated in the present invention, so that the thickness of the backlight module of the present invention can be reduced. At the same time, the design of the hook can be eliminated in the present invention, so that the assembly of the backlight module of the present invention can be simpler and the cost is lower, and it can be more automatically introduced into the backlight module.

Referring to FIGS. 8 and 9 , it shows a liquid crystal display device 110 according to an embodiment of the present invention. The liquid crystal display device 110 includes the backlight module 120 and a liquid crystal panel 114 of the present invention. The liquid crystal panel 114 is fixed in the first accommodation space 163 of the light guide plate 122, such as by first disposing an adhesive strip 166 on the second bottom surface 164c of the first accommodation space 163 of the light guide plate 122, and then placing the liquid crystal panel 114 It is fixed in the first accommodating space 163 of the light guide plate 122 .

The liquid crystal display device 110 may further include a front frame 112 directly combined with the light guide plate 122 of the backlight module 120 , thereby combining the front frame 112 , the liquid crystal panel 114 and the backlight module 120 into a liquid crystal display device 110 . Referring to Fig. 9 again, the two sides 156 of the light guide plate 122 are provided with at least one screw hole 157, the reflector 128 is provided with at least one through hole 157', and the front frame 112 includes at least one screw 158 and at least one through hole 113, the screw 158 is used Through the through hole 113 and the through hole 157 ′ and locked in the screw hole 157 , the front frame 112 is directly locked and combined with the light guide plate 122 . Preferably, at least one metal post 159 is buried on the two sides 156 of the light guide plate 122 . The metal pillar is made of copper metal. The metal post is provided with a screw hole 157 , so that the screw 158 can be locked in the screw hole 157 . Referring again to FIG. 9 , the liquid crystal panel 114 defines a visible area 172 and a non-visible area 174 . The front frame 112 covers the non-visible area 174 of the liquid crystal panel 114. It is worth mentioning that the positions of the screw holes 157 and the metal posts 159 are all outside the scope of the visible area 172, that is, the screw holes 157 and the metal posts 159 are set The position of does not affect the normal display of the picture in the visible area 172 .

The light guide plate 122 of the present invention can be integrally formed (such as cutting or injection molding) by a general machining method to form openings required by the metal pillars 159 for placing the metal pillars 159 .

Referring to FIG. 10 , it shows an electrical device 100 according to an embodiment of the present invention. The electrical device 100 can be an LCD TV or a computer screen. The electrical equipment 100 includes the liquid crystal display device 110 of the present invention and a frame 102 . The outer frame 102 is combined with the front frame 112 of the liquid crystal display device 110 , so that the liquid crystal display device 110 and the outer frame 102 are combined into an electrical device 100 .

Referring to FIGS. 11 and 12 , it shows an electrical device 200 according to another embodiment of the present invention. The electrical device 200 can be an LCD TV or a computer screen. The electrical equipment 200 includes a liquid crystal display device 210 and a frame 202 . The LCD device 210 is substantially similar to the LCD device 110 of the present invention, and the same elements in the two embodiments are marked with the same reference numerals, but the LCD device 210 does not include the front frame 112 of the LCD device 110 . The outer frame 202 is directly combined with the light guide plate 222 of the backlight module 220 of the liquid crystal display device 210 , thereby combining the liquid crystal display device 210 and the outer frame 202 into an electrical device 200 . Referring to FIG. 12 again, the two sides 256 of the light guide plate 222 are provided with at least one screw hole 257, the reflector 228 is provided with at least one through hole 257', and the outer frame 202 includes at least one screw 258 and at least one screw hole 203, the screw 258 is It is used to pass through the hole 203 and the through hole 257 ′ and lock to the screw hole 257 , so that the outer frame 202 is directly combined with the light guide plate 222 . Preferably, at least one metal column 259 is buried on the two sides 156 of the light guide plate 222 . The metal post 259 can be made of copper metal. The metal post is provided with a screw hole 257 , so that the screw 258 can be locked in the screw hole 257 . Referring to FIG. 12 again, the liquid crystal panel 214 defines a visible area 272 and a non-visible area 274 . The outer frame 202 covers the non-visible area 274 of the liquid crystal panel 214. It is worth mentioning that the positions of the screw holes 257 and the metal posts 259 are all outside the range of the visible area 272, that is, the screw holes 257 and the metal posts 259 are set The position does not affect the normal display of the screen in the visible area.

Although the present invention has been disclosed by the foregoing embodiments, it is not intended to limit the present invention. Any person skilled in the art to which the present invention belongs can make various modifications and changes without departing from the spirit and scope of the present invention. Revise. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims (6)

1. A light guide plate allowing light to be reflected therein, comprising: a top surface; a first bottom surface, which is opposite to the top surface; Four first sides, the first sides connect the top surface and the first bottom surface; A first accommodating space, which is arranged on the top surface, the first accommodating space includes four second sides, a first opening and a second bottom surface, wherein the second sides connect the top surface and the second a bottom surface, and the second side surfaces are adjacent to the first side surfaces and arranged parallel to the first side surfaces, the second bottom surface is parallel to the top surface, and the first opening is arranged on the top surface; A second accommodating space, which is arranged on the second bottom surface, the second accommodating space includes four third sides, a second opening and a third bottom surface, and the third sides connect the second bottom surface and the first bottom surface Three bottom surfaces, and the third sides are adjacent to the second sides and arranged parallel to the second sides, wherein the distance between the third side and the first side is greater than the distance between the second side and the first side The distance between, the third bottom surface is parallel to the second bottom surface, the second opening is arranged on the second bottom surface; and A third accommodating space, which includes a third opening, the third opening is located at least on one of the top surface, the first bottom surface, and the first side surface, wherein the third opening located on the first side surface is Composed of two or three planes. 2. A backlight module, comprising: A light guide plate, comprising: a top surface; a first bottom surface, which is opposite to the top surface; Four first sides, the first sides connect the top surface and the first bottom surface; A first accommodating space, which is arranged on the top surface, the first accommodating space includes four second sides, a first opening and a second bottom surface, wherein the second sides connect the top surface and the second a bottom surface, and the second side surfaces are adjacent to the first side surfaces and arranged parallel to the first side surfaces, the second bottom surface is parallel to the top surface, and the first opening is arranged on the top surface; A second accommodating space, which is arranged on the second bottom surface, the second accommodating space includes four third sides, a second opening and a third bottom surface, and the third sides connect the second bottom surface and the first bottom surface Three bottom surfaces, and the third sides are adjacent to the second sides and arranged parallel to the second sides, wherein the distance between the third side and the first side is greater than the distance between the second side and the first side The distance between, the third bottom surface is parallel to the second bottom surface, the second opening is arranged on the second bottom surface; and A third accommodating space includes a third opening, and the third opening is located at least on one of the top surface, the first bottom surface, and the first side surface, wherein the third opening on the first side surface is two Composed of planes or three planes; an optical film group arranged in the second accommodating space; and a light source unit arranged in the third accommodating space, wherein the light of the light source unit is reflected in the light guide plate; and A reflection sheet covers the first side surfaces, the first bottom surface and part of the top surface to seal the light source unit in the third accommodating space. 3. A liquid crystal display device comprising: A backlight module, including: A light guide plate, comprising: a top surface; a first bottom surface, which is opposite to the top surface; Four first sides, the first sides connect the top surface and the first bottom surface; A first accommodating space, which is arranged on the top surface, the first accommodating space includes four second sides, a first opening and a second bottom surface, wherein the second sides connect the top surface and the second a bottom surface, and the second side surfaces are adjacent to the first side surfaces and arranged parallel to the first side surfaces, the second bottom surface is parallel to the top surface, and the first opening is arranged on the top surface; A second accommodating space, which is arranged on the second bottom surface, the second accommodating space includes four third sides, a second opening and a third bottom surface, and the third sides connect the second bottom surface and the first bottom surface Three bottom surfaces, and the third sides are adjacent to the second sides and arranged parallel to the second sides, wherein the distance between the third side and the first side is greater than the distance between the second side and the first side The distance between, the third bottom surface is parallel to the second bottom surface, the second opening is set to the second bottom surface; and A third accommodating space, including a third opening, the third opening is located at least one of the top surface, the first bottom surface and the first side, wherein the third opening on the first side is two Composed of planes or three planes; an optical film group arranged in the second accommodating space; and a light source unit arranged in the third accommodating space; a reflective sheet covering the first side surfaces, the first bottom surface and part of the top surface to seal the light source unit in the third accommodating space; and a liquid crystal panel fixed in the first accommodating space, The light from the light source unit is reflected in the light guide plate and incident on the optical film group to illuminate the liquid crystal panel. 4. The liquid crystal display device according to claim 3, further comprising: A front frame is directly combined with the light guide plate, thereby combining the front frame, the liquid crystal panel and the backlight module into a liquid crystal display device, wherein the first side of the light guide plate is provided with at least one screw hole, and the front frame Contains at least one screw for locking in the screw hole. 5. An electrical device, comprising: A liquid crystal display device, comprising: A backlight module, including: A light guide plate, comprising: a top surface; a first bottom surface, which is opposite to the top surface; Four first sides, the first sides connect the top surface and the first bottom surface; A first accommodating space, which is arranged on the top surface, the first accommodating space includes four second sides, a first opening and a second bottom surface, wherein the second sides connect the top surface and the second a bottom surface, and the second side surfaces are adjacent to the first side surfaces and arranged parallel to the first side surfaces, the second bottom surface is parallel to the top surface, and the first opening is arranged on the top surface; A second accommodating space, which is arranged on the second bottom surface, the second accommodating space includes four third sides, a second opening and a third bottom surface, and the third sides connect the second bottom surface and the first bottom surface Three bottom surfaces, and the third sides are adjacent to the second sides and arranged parallel to the second sides, wherein the distance between the third side and the first side is greater than the distance between the second side and the first side The distance between, the third bottom surface is parallel to the second bottom surface, the second opening is set to the second bottom surface; and A third accommodating space includes a third opening, and the third opening is located at least on one of the top surface, the first bottom surface, and the first side surface, wherein the third opening on the first side surface is two Composed of planes or three planes; an optical film group arranged in the second accommodating space; a light source unit arranged in the third accommodating space; a reflective sheet covering the first side surfaces, the first bottom surface and part of the top surface to seal the light source unit in the third accommodating space; A liquid crystal panel, fixed in the first accommodation space of the light guide plate, wherein the light from the light source unit is reflected in the light guide plate and incident on the optical film group to illuminate the liquid crystal panel; and A front frame is directly combined with the light guide plate, thereby combining the front frame, the liquid crystal panel and the backlight module into a liquid crystal display device; and An outer frame is combined with the front frame, so that the liquid crystal display device and the outer frame are combined into an electrical equipment. 6. The electrical device according to claim 5, wherein at least one screw hole is formed on the side of the light guide plate, and the front frame includes at least one screw for locking in the screw hole.

Images