TW201423232A - Backlight module and display device using same - Google Patents

Abstract

The present invention relates to a backlight module and a display device using the backlight module. The backlight module is configured to provide light to the display device. The backlight module includes a light source, a guide light plate, and a plurality of optical films. The guide light plate includes a main body configured to guide the light from the light source. The main body includes a light emitting surface. The optical films are positioned on a side of the light emitting surface. A limiting structure is positioned on an peripheral area of the light guide plate. The limiting structure includes a first limiting part protruding from the light emitting surface. The first limiting part and the light emitting surface cooperatively define a receiving space for receiving the optical films.

Description

Backlight module and display device having the same

The invention relates to a backlight module and a display device having the same.

Currently, display devices, such as liquid crystal display devices, typically include a display panel and a backlight module for providing backlighting for the display panel. The backlight module generally includes a light guide plate, a light source assembly, an optical film set, a plastic frame for fixing the optical film set and the light guide plate, and a light guide plate, a light source assembly, an optical film set, and a back plate of the plastic frame. And other components. However, due to the presence of a frame such as a plastic frame, the backlight module and the display device having the backlight module are thicker.

In view of this, it is necessary to provide a thin backlight module.

In view of this, it is also necessary to provide a display device having a thin thickness.

The invention provides a backlight module for providing backlighting for a display device. The backlight module includes a light source assembly, a light guide plate and an optical film set. The light guide plate includes a body for guiding light emitted by the light source assembly, and the body includes a light exiting surface. The optical film group is disposed on the light-emitting surface side of the main body. The edge of the light guide plate is provided with a defining portion, and the defining portion includes a first defining structure. The first defining structure protrudes from the light emitting surface, and the first defining structure cooperates with the light emitting surface to form a receiving space, and the optical film group is received in the receiving space.

The invention provides a display device comprising a display panel and a backlight module. The display panel is used for displaying a picture, and the backlight module is used to provide a light source for the display template. The backlight module includes a light source assembly, a light guide plate and an optical film set. The light guide plate includes a body for guiding light emitted by the light source assembly, and the body includes a light exiting surface. The optical film group is disposed on the light-emitting surface side of the main body. The edge of the light guide plate is provided with a defining portion, and the defining portion includes a first defining structure. The first defining structure protrudes from the light emitting surface, and the first defining structure cooperates with the light emitting surface to form a receiving space, and the optical film group is received in the receiving space.

Compared with the prior art, the light guide plate of the present invention further includes the defining portion, and the defining portion includes a first defining structure that encloses a receiving space with the light emitting surface of the main body, so that the optical film group can pass through, for example, pasting The housing is fixed in the receiving space, so that the plastic frame in the conventional backlight module can be saved. Therefore, the backlight module and the display device having the light guide plate are thinner.

This embodiment is described by taking a liquid crystal display device as an example, and the present invention is also applicable to other suitable types of display devices.

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic view showing the explosion structure of the liquid crystal display device of the present invention. 2 is a partially enlarged schematic view showing a liquid crystal display panel of the liquid crystal display device shown in FIG. 1. The liquid crystal display device 1 includes a light-shielding tape 10, a liquid crystal display panel 12, a driving circuit component 13, and a backlight module 14 for realizing a backlight for the screen display of the liquid crystal display panel 12. The backlight module 14 includes an optical film set 15 , a light guide plate 16 , a reflection sheet 18 , and a light source assembly 19 . The liquid crystal display panel 12 includes a display area 12a and a non-display area 12b. The display area 12a of the liquid crystal display panel 12 is an area for displaying a screen, such as a central area of the liquid crystal display panel 12; the non-display area 12b of the liquid crystal display panel 12 is a peripheral area of the display area 12a. The driving circuit component 13 is connected to the non-display area 12b of the liquid crystal display panel 12 for providing a driving signal for realizing the screen display of the display area 12a of the liquid crystal display panel 12. In the present embodiment, the driving circuit component 13 includes a flexible circuit board 131 and a printed circuit board 133 provided with circuit components (not shown). The light source assembly 19 is for providing visible light. The light guide plate 16 is configured to convert the visible light into planar light, and to carry the optical film set 15 and the liquid crystal display panel 12. The optical film group 15 is subjected to optical processing such as homogenization and atomization of the planar light emitted from the light guide plate to provide uniform planar light to the liquid crystal display panel 12. The light-shielding tape 10 is for preventing light inside the liquid crystal display device 1 from being emitted from the non-display area 12a of the liquid crystal display device 1.

Preferably, the light shielding tape 10 is a hollow frame, and includes a plurality of sidewalls 101, and a horizontal portion 103 on the same side of the plurality of sidewalls 101 and connected to the plurality of sidewalls 101. The horizontal portion 103 is a Hollow sheet. In this embodiment, the plurality of side walls 101 are four side walls, and the horizontal portion 103 is a rectangular hollow sheet. The optical film group 15 includes a plurality of optical films 141. In the present embodiment, the plurality of optical films are, for example, a diffusion sheet, a prism sheet, or the like. Each optical film 141 includes a body 141a and two lugs 141b extending from opposite sides of the body 141a. The two lugs 141b are different in size. The two lugs 141b serve to prevent an error (detention) from occurring when the optical film 141 is assembled.

Please refer to FIG. 3-5 together. FIG. 3 is a schematic diagram of the explosion structure of the light guide plate 16. 4 is a schematic perspective view of the front side of the light guide plate 16. FIG. 5 is a schematic perspective view showing the back side of the light guide plate 16. The light guide plate 16 includes a main body 16a and a defining portion 16b. In the present embodiment, the main body 16a and the defining portion 16b are two independent structures. The defining portion 16b is fixed to the main body 16a by means of pasting or the like. Alternatively, the defining portion 16b and the main body 16a may be of a unitary structure, and preferably, the defining portion 16b and the main body 16a are integrally formed of the same material. The body 16a is for guiding light emitted by the light source assembly 19. The body 16a includes a bottom surface 161 (see FIG. 5) and a light exit surface 162 opposite the bottom surface 161. The outer contour of the light exit surface 162 is rectangular. The bottom surface 161 of the main body 16a is provided with a receiving groove 161a for receiving the reflection sheet 18. The receiving groove 161a is formed by recessing the bottom surface 161 toward the light-emitting surface 162.

The defining portion 16b includes a first defining structure 163. The first defining structure 163 is disposed adjacent to the edge of the light emitting surface 162 of the main body 16a and protrudes from the light emitting surface 162 for engaging with the light emitting surface 162 to form a receiving space 165 for receiving the optical film group 15 . Specifically, the light emitting surface 162 of the main body 16a is used to carry the optical film set 15. The optical film set 15 is adhered to the light exit surface 162. In the embodiment, the first defining structure 163 is disposed on the light emitting surface 162 and disposed around the edge of the light emitting surface 162.

Preferably, the first defining structure 163 is a hollow frame including a first strip structure 163a, a second strip structure 163b, a third strip structure 163c, and a fourth strip structure 163d. The first defining structure 163 is formed by sequentially connecting the first strip structure 163a, the second strip structure 163b, the third strip structure 163c, and the fourth strip structure 163d. Wherein, a corner 163e is formed around the intersection of each of the two strip-shaped structures. The inner side of the second strip-shaped structure 163b and the fourth strip-shaped structure 163d are respectively provided with notches 163f, and the two notches 163f are respectively formed by recessing the inner side surface of the two opposite strip-shaped structures toward the outer side surface. The shape of the two notches 163f and the two lugs 141b on the optical film 141 are respectively the same, and the size of the notch 163f is slightly larger than the size of the lugs 141b having the same shape for receiving the lugs of the plurality of optical films 141. 141b.

The defining portion 16b further includes a second defining structure 164. The first defining structure 163 includes a free end 170 that protrudes from one end of the light exiting surface 162 of the main body 16a. The free end 170 includes an end surface 170a opposite the bottom surface 161. The second defining structure 164 protrudes from the end surface 170a of the free end 170 of the first defining structure 163, forming a step with the free end 170. The second defining structure 164 and the end surface 170a of the free end 170 of the first defining structure 163 together define an accommodating space 171 for placing the liquid crystal display panel 12. The end surface 170a is for carrying the liquid crystal display panel 12. The liquid crystal display panel 12 is adhered to the end surface 170a.

The second defining structure 164 includes at least two bent portions 172. Preferably, the at least two bent portions 172 are "∟"-shaped bent portions 172. Each "∟" type bent portion 172 corresponds to a corner 163e, respectively. In this embodiment, the at least two "∟"-type bent portions 172 are four "∟"-type bent portions. Optionally, the at least two "∟"-shaped bent portions 172 are two "∟"-type bent portions. The two "∟"-type bent portions 172 respectively correspond to the two corners 163e on a pair of angular lines.

The second defining structure 164 further includes a strip defining block 173 spaced from the "∟" shaped bend.

In this embodiment, the first defining structure 163 and the second defining structure 164 are the same material and are all light absorbing materials, such as black resin materials. The material of the defining portion 16b is different from the material of the main body 16a. The main body 16a is a white resin material. Further, the defining portion 16b and the main body 16a can be processed by a two-color injection molding technique or a secondary injection molding technique.

Please refer to FIG. 6. FIG. 6 is an enlarged schematic view of the "∟" type bent portion 172. A "∟" type buffer groove 172a recessed inside the "∟" type bent portion 172 is formed inside the "∟"-shaped bent portion 172. The "∟" type buffer groove 172a is for maintaining a certain distance between the "∟" type bent portion 172 and the corner of the liquid crystal display panel 12 to prevent damage to the corner of the liquid crystal display panel 12.

Please refer to FIG. 7. FIG. 7 is a schematic perspective view of the light source assembly 19. The light source assembly 19 includes a circuit board 191, a plurality of light sources 192, and a drive circuit 193. The circuit board 191 is configured to carry the plurality of light sources 192 and the driving circuit 193. The driving circuit 193 is configured to drive the plurality of light sources 192 to emit light. The width of one end of the circuit board 191 including the driving circuit 193 is wider than the width of the remaining portion of the circuit board 191.

Please refer to FIG. 8. FIG. 8 is a partially enlarged schematic view showing a portion VIII of the light guide plate 16 shown in FIG. The light guide plate 16 is formed on a side between the end surface 170a of the free end 170 and the bottom surface 161 of the main body 16a, and a receiving groove 16c recessed into the main body 16a. The receiving groove 16c is for receiving the light source assembly. 19.

Please refer to FIG. 9-10 together. FIG. 9 is a schematic view showing the assembled structure of the liquid crystal display device 1 shown in FIG. FIG. 10 is a partial cross-sectional structural view of the liquid crystal display device 1 shown in FIG. 9 taken along the X-X direction. The assembly process of the liquid crystal display device 1 is: first, the reflective sheet 18 is adhered to the receiving groove 161a of the bottom surface 161 of the light guide plate 16; the light source assembly 19 is adhered to the receiving groove 16c; 15 is adhered to the light-emitting surface 162 of the main body 16a; the liquid crystal display panel 12 is adhered to the end surface 170a of the free end 170 of the first defining structure 163, and the printed circuit board 133 in the driving circuit component 13 is wound around the reflection surface On the side of the sheet 18 (not shown); finally, the light-shielding tape 10 is attached to the non-display area 12b of the liquid crystal display device 1 to prevent light from the inside of the liquid crystal display device 1 from the non-display area 12b of the liquid crystal display device 1. Shoot out.

Since the light guide plate 16 of the present invention further includes the defining portion 16b, the defining portion 16b includes a first defining structure 163 enclosing the receiving space 165 with the light emitting surface 162 of the main body 16a, so that the optical film group 15 can pass through The frame or the like is housed and fixed in the accommodating space 165, so that the plastic frame in the conventional display device can be saved. Therefore, the backlight module 14 having the light guide plate 16 and the liquid crystal display device 1 are thin.

Further, since the defining portion 16b includes a second defining structure 164, the second defining structure 164 cooperates with the first defining structure 163 to form an accommodating space 171 to define a region where the liquid crystal display panel 12 is placed, the free end 170 is used to carry the liquid crystal display panel 12. The liquid crystal display panel 12 can be fixed to the free end 170 by, for example, pasting. The reflection sheet 18 is adhered to the bottom surface 161 of the light guide plate 16. The light source assembly 19 is adhered to the accommodating groove 16c, and the light shielding tape 10 is attached to the non-display area 12b of the liquid crystal display device 1 so that the light in the liquid crystal display device 1 is displayed from the display area of the liquid crystal display panel 12. 12a shot. Therefore, the liquid crystal display device 1 does not require the front frame and the back plate in the conventional display device. Further, the thickness of the liquid crystal display device 1 having the light guide plate 16 is thinner.

Further, the light source assembly 19 is adhered to the accommodating groove 16c, thereby effectively utilizing the visible light emitted by the plurality of light sources 192, thereby reducing the number of the light sources 192 used. Further, the manufacturing cost of the liquid crystal display device 1 is low.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

1. . . Liquid crystal display device

10. . . Shading tape

12. . . LCD panel

13. . . Drive circuit component

15. . . Optical film set

16. . . Light guide

18. . . A reflective sheet

19. . . Light source assembly

12a. . . Display area

12b. . . Non-display area

131. . . Flexible circuit board

133. . . A printed circuit board

101. . . Side wall

103. . . Horizontal part

141. . . Optical diaphragm

141a. . . Ontology

141b. . . Lug

16a. . . main body

16b. . . Limitation

161. . . Bottom

162. . . Glossy surface

161a. . . Storage slot

163. . . First defined structure

163a. . . First shape structure

163b. . . Second strip structure

163c. . . Third strip structure

163d. . . Fourth strip structure

164. . . Second defined structure

163e. . . corner

163f. . . gap

165. . . Containing space

170. . . Free end

170a. . . End face

16c. . . Locating slot

171. . . Housing space

172. . . Bending section

173. . . Qualified block

172a. . . Buffer tank

191. . . Circuit board

192. . . light source

193. . . Drive circuit

14. . . Backlight module

1 is a schematic view showing the explosion structure of a liquid crystal display device of the present invention.

2 is a partially enlarged schematic view showing a liquid crystal display panel of the liquid crystal display device shown in FIG. 1.

3 is a schematic exploded view of a light guide plate of the liquid crystal display device shown in FIG. 1.

4 is a front perspective view showing the light guide plate of the liquid crystal display device shown in FIG. 1.

FIG. 5 is a schematic perspective view showing the back side of a light guide plate of the liquid crystal display device shown in FIG. 1. FIG.

Fig. 6 is an enlarged schematic view showing a "∟" type bent portion of the second defining structure of the light guide plate shown in Fig. 3.

FIG. 7 is a schematic perspective structural view of a light source assembly of the liquid crystal display device shown in FIG. 1. FIG.

FIG. 8 is a partially enlarged schematic view showing a portion VIII of the light guide plate shown in FIG. 4. FIG.

FIG. 9 is a schematic view showing the assembled structure of the liquid crystal display device shown in FIG. 1. FIG.

Figure 10 is a partial cross-sectional structural view of the liquid crystal display device of Figure 9 taken along the X-X direction.

1. . . Liquid crystal display device

10. . . Shading tape

12. . . LCD panel

13. . . Drive circuit component

15. . . Optical film set

16. . . Light guide

18. . . A reflective sheet

19. . . Light source assembly

131. . . Flexible circuit board

133. . . A printed circuit board

101. . . Side wall

103. . . Horizontal part

141. . . Optical diaphragm

141a. . . Ontology

14. . . Backlight module

141b. . . Lug

Claims (17)

A backlight module for providing backlight for a display device, the backlight module comprising a light source assembly, a light guide plate and an optical film set, the light guide plate comprising a body for guiding the light source assembly The light body has a light-emitting surface, and the optical film group is disposed on a side of the light-emitting surface of the body, wherein the edge of the light guide plate is provided with a defining portion, and the defining portion includes a first defining structure, the first The limiting structure protrudes from the light emitting surface, and the first defining structure cooperates with the light emitting surface to form a receiving space, and the optical film group is received in the receiving space. The backlight module of claim 1, wherein the optical film group is adhered to the receiving space. The backlight module of claim 1, wherein the main body and the defining portion are of a unitary structure. The backlight module of claim 3, wherein the main body and the defining portion are integrally formed from the same material. The backlight module of claim 1, wherein the material of the defining portion is different from the material of the main body. The backlight module of claim 1, wherein the material of the defining portion is a light absorbing material. The backlight module of claim 1, wherein the first defining structure is a hollow frame surrounded by a plurality of strip structures. The backlight module of claim 1, wherein the optical film set comprises at least one optical film, the optical film comprising a body and a lug extending from opposite sides of the body, respectively, The opposite sides of the first defining structure are respectively formed with a notch, and the notch accommodates the two lugs of the optical film. The backlight module of claim 1, wherein the light guide plate includes a bottom surface opposite to a light emitting surface of the main body, the first defining structure includes a free end, the free end is protruding by the first defining structure At one end of the light-emitting surface of the main body, the free end includes an end surface opposite to the bottom surface of the light guide plate, and the defining portion further includes a second defining structure protruding from an end surface of the free end of the first defining structure, The second defining structure and the end surface of the free end of the first defining structure together define an accommodating space. The backlight module of claim 9, wherein the accommodating space is for accommodating a display panel of the display device, and the end surface is for carrying a display panel of the display device. The backlight module of claim 9, wherein the light guide plate comprises a plurality of corners, and the second defining structure comprises at least two bent portions, each of the bent portions corresponding to a corner . The backlight module of claim 11, wherein the at least two-bend type bent portion comprises a two-turn type bent portion on a pair of angle lines. The backlight module of claim 11, wherein the inside of the meandering bent portion is formed with a meandering buffer groove recessed toward the inside of the meandering bent portion, the second defining structure further comprising a strip shape A defining block is spaced apart from the meandering bend. The backlight module of claim 1, wherein the backlight module further comprises a reflective sheet, the reflective sheet is configured to reflect light emitted by the light source assembly to a light emitting surface of the main body, and a bottom surface of the light guide plate A receiving groove for receiving the film is disposed, and the receiving groove is formed by recessing the bottom surface toward the light emitting surface. A display device includes a display panel and a backlight module, wherein the display panel is used for displaying a picture, and the backlight module is used for providing a light source for the display template, wherein the backlight module is the first patent application scope The backlight module of any one of the preceding claims. The display device of claim 15, wherein the display panel is housed in the accommodating space. The display device of claim 16, wherein the display panel is adhered to the end surface.