TWM522374U - Backlight module and display device - Google Patents

Abstract

A backlight module and a display device are described. The backlight module includes a frame, a light guide plate, a connecting member and a light source. The light guide plate is disposed in the frame. The light guide plate includes a light-incident surface and an optical surface connected to the light-incident surface. The light-incident surface of the light guide plate is an inclined surface, and plural microstructures are disposed on the light-incident surface. The connecting member is disposed on the optical surface and adjacent to the light-incident surface. The connecting member is used to fix the light guide plate on the frame. The light source is disposed adjacent to the light-incident surface. The whole or a portion of light generated from the light source is refracted by the inclined light-incident surface, and deviates from the connecting member after entering the light guide plate.

Description

Backlight module and display device

The present invention relates to a light source module, and in particular to a backlight module and its application to a display device.

In the design of a general backlight module, in order to fix the light guide plate, double-sided adhesive is usually adhered to the bottom surface of the light guide plate, and the light guide plate is adhered to the back plate through the double-sided tape.

However, when the light generated by the light source enters the light guide plate from the light incident surface of the light guide plate, the light that is incident on the double-sided tape may be reflected or absorbed by the double-sided tape due to the material or color of the double-sided tape. As a result, when the light entering the light guide plate is reflected or absorbed by the double-sided tape, the light leakage or the uneven light emission of the backlight module may be caused.

Therefore, an object of the present invention is to provide a backlight module and a display device, which can improve the uniformity of light output of the backlight module and the display device.

According to the above object of the present invention, a backlight module is proposed. The backlight module comprises a frame, a light guide plate, a connecting member and a light source. The light guide plate is disposed in the frame. Moreover, the light guide plate includes a light incident surface and an optical surface connected to the light surface. The light incident surface of the light guide plate is a sloped surface, and a plurality of microstructures are arranged on the light incident surface. The connecting member is disposed on the optical surface and adjacent to the light incident surface, and the connecting member is used for fixing the light guide plate to the frame. The light source is adjacent to the light surface, and all or a part of the light generated by the light source is refracted by the incident surface of the inclined surface, and is directed to deviate from the connecting member after entering the light guide plate.

According to an embodiment of the present invention, the optical surface is a reflective surface. The light guide plate further comprises a light-emitting surface opposite to the optical surface. The first edge connecting the light incident surface and the optical surface is away from the light source than the second edge connected to the light incident surface and the light exit surface.

According to another embodiment of the present invention, the optical surface is a light exiting surface. The light guide plate further includes a reflective surface opposite to the optical surface. The first edge connected to the optical surface and the optical surface is away from the light source than the second edge connected to the reflective surface and the reflective surface.

According to still another embodiment of the present invention, each of the microstructures is a strip structure, and each of the microstructures extends in a direction parallel to an oblique direction of the light incident surface.

According to still another embodiment of the present invention, each of the microstructures is a strip structure, and each of the microstructures extends in a direction perpendicular to an oblique direction of the light incident surface.

According to still another embodiment of the present invention, each of the microstructures described above is a dot structure or a 稜鏡 structure.

According to still another embodiment of the present invention, the frame has a placement portion, and the connector is disposed at the placement portion.

According to still another embodiment of the present invention, the connecting member is an adhesive tape.

According to the above object of the present invention, a display device is further proposed. The display device includes the foregoing backlight module and a display panel. The display panel is located in front of the light guide plate in the backlight module.

As can be seen from the above, the present invention is designed to reduce the incidence of light entering the light guide plate from the light incident surface and then to the connecting member through the design of the light incident surface of the light guide plate. Thereby, the light entering the light guide plate can be greatly reduced, which is affected by uncertain factors such as reflection or absorption of the connecting member, thereby improving the problem of uneven light emission of the backlight module.

On the other hand, the light incident surface of the light guide plate is provided with a microstructure, thereby increasing the light incident angle and uniformity of the light generated by the light source, and also avoiding the problem that the light guide plate is darkened at a portion close to the light incident surface.

100‧‧‧Backlight module

120‧‧‧Frame

121‧‧‧Placement Department

140‧‧‧Light guide plate

141‧‧‧Into the glossy surface

141a‧‧‧ first edge

141b‧‧‧ second edge

141c‧‧‧Microstructure

141d‧‧‧Microstructure

141e‧‧‧Microstructure

143‧‧‧Optical surface

145‧‧‧Glossy

160‧‧‧Connecting parts

180‧‧‧Light source

200‧‧‧Backlight module

220‧‧‧Frame

221‧‧‧Placement Department

240‧‧‧Light guide plate

241‧‧‧Into the glossy surface

241a‧‧‧ first edge

241b‧‧‧ second edge

243‧‧‧Optical surface

245‧‧‧reflecting surface

260‧‧‧Connecting parts

280‧‧‧Light source

300‧‧‧ display device

310‧‧‧ display panel

For a more complete understanding of the embodiments and the advantages thereof, the following description is made with reference to the accompanying drawings, wherein: FIG. 1 is a schematic diagram showing a partial device of a backlight module according to a first embodiment of the present invention; FIG. 2 is a top view showing a backlight module according to a first embodiment of the present invention; FIG. 3 is a front view showing a light incident surface of a first light guide plate according to the first embodiment of the present invention; FIG. 4 is a second light guide plate according to the first embodiment of the present invention. A front view of the light incident surface; [Fig. 5] is a front view showing a light incident surface of a third light guide plate according to the first embodiment of the present invention; [Fig. 6] is a second drawing according to the present invention. A schematic diagram of a partial device of a backlight module according to an embodiment; and FIG. 7 is a schematic diagram of a partial device of a display device according to an embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a partial device of a backlight module according to a first embodiment of the present invention. The backlight module 100 of the present embodiment includes a frame 120, a light guide plate 140, a connector 160, and a light source 180. The light guide plate 140 is disposed in the frame 120 through the connector 160. The light-incident surface 141 of the light guide plate 140 is designed as a slope. The slope design prevents the light generated by the light source 180 from entering the light guide plate 140 and then hitting the connecting member 160, thereby preventing the connecting member 160 from affecting the light-emitting effect of the light guide plate 140. .

With continued reference to FIG. 1 , in the present embodiment, the frame 120 may be a back plate, and the light guide plate 140 is disposed in the frame 120 . As shown in FIG. 1 , the light guide plate 140 includes a light incident surface 141 , an optical surface 143 , and a light exit surface 145 . In the present embodiment, the optical surface 143 is a reflecting surface, and the optical surface 143 is opposite to the light emitting surface 145. In addition, the light incident surface 141 has a first edge 141a and a second edge 141b, and the optical surface 143 and the light-emitting surface 145 are connected to the first edge 141a and the second edge 141b, respectively. As shown in FIG. 1 , the frame 120 has a placement portion 121 , and the connector 160 is disposed on the placement portion 121 . In one embodiment, the connecting member 160 can be an adhesive tape and adhered to the optical surface 143 of the light guide plate 140 near the light incident surface 141. Thereby, the light guide plate 140 can be fixed to the frame 120 through the connecting member 160. It is to be understood that in some embodiments, a groove may be provided on the optical surface 143 of the light guide plate 140 to accommodate the connector 160.

Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 2 is a top view of a backlight module according to a first embodiment of the present invention. In the present embodiment, the light source 180 is disposed beside the light incident surface 141, and the light generated by the light source 180 enters the light guide plate 140 from the light incident surface 141 and is emitted from the light exit surface 145. As shown in FIG. 1, in the present embodiment, the light incident surface 141 of the light guide plate 140 is a sloped surface. In the present embodiment, the first edge 141a of the light incident surface 141 and the optical surface 143 is separated from the light source 180 by the second edge 141b connected to the light surface 141 and the light exit surface 145. Therefore, all or a part of the light generated by the light source 180 is refracted through the light incident surface 141 and enters the light guide plate 140, and can be directed to the off-connecting member 160, so that the light can be avoided. The problem of uneven light emission is caused by reflection or absorption by the connecting member 160.

Please refer to FIG. 2 and FIG. 3 together. FIG. 3 is a front elevational view showing the light incident surface of the first light guide plate according to the first embodiment of the present invention. In some embodiments, a plurality of microstructures 141c are disposed on the light incident surface 141 of the light guide plate 140. In the present embodiment, each of the microstructures 141c is a strip structure. Moreover, as shown in Figures 2 and 3, the extension of each microstructure 141c The direction is parallel to the oblique direction of the light incident surface 141. That is, the extending direction of the microstructure 141c is parallel to the vertical direction of the first edge 141a and the second edge 141b of the light incident surface 141. In some examples, microstructure 141c can be a cylindrical or triangular columnar structure. Thereby, the light incident angle of the light generated by the light source 180 can be increased through the microstructure 141c, and the problem that the light guide plate 140 is close to the light incident surface 141 can be avoided.

It is to be noted that the extending direction of the microstructure 141c of the embodiment shown in FIG. 2 and FIG. 3 is parallel to the vertical direction of the first edge 141a and the second edge 141b of the light incident surface 141, but this is not intended to limit the present invention. . In other embodiments, the microstructures on the light incident surface 141 can have different orientations. Referring to FIG. 4, it is a front view showing a light incident surface of a second light guide plate according to the first embodiment of the present invention. In the embodiment shown in FIG. 4, the microstructure 141d on the light incident surface 141 is also a strip structure, but the strip structure extends in a direction parallel to the extending direction of the first edge 141a or the second edge 141b. In some examples, microstructure 141d can be a cylindrical or triangular columnar structure.

In some embodiments, the microstructures are not limited to the strip patterns shown in Figures 2 through 4. Referring to FIG. 5, it is a front view showing a light incident surface of a third light guide plate according to the first embodiment of the present invention. In the embodiment shown in FIG. 5, the microstructure 141e on the light incident surface 141 is a meandering structure. In other embodiments, the microstructure on the light incident surface 141 may also be a dot structure or other structure that allows the light to enter the light to be uniform.

In the present invention, the oblique direction of the light incident surface of the light guide plate depends on the position at which the connector is disposed. In the embodiment shown in FIG. 1, the connector 160 It is set on the bottom surface of the light guide plate. In other embodiments, the connecting members may have different setting positions, and the light incident surface of the light guide plate is inclined corresponding to the setting of the connecting member. Please refer to FIG. 6 , which is a schematic diagram of a partial device of a backlight module according to a second embodiment of the present invention.

As shown in FIG. 6 , the backlight module 200 of the present embodiment also includes a frame 220 , a light guide plate 240 , a connecting member 260 , and a light source 280 . In this embodiment, the frame 220 may be a plastic frame, and the light guide plate 240 is disposed in the frame 220. As shown in FIG. 6, the light guide plate 240 includes a light incident surface 241, an optical surface 243, and a reflective surface 245. In the present embodiment, the optical surface 243 is a light exiting surface, and the optical surface 243 is opposed to the reflective surface 245. In addition, the light incident surface 241 has a first edge 241a and a second edge 241b, and the optical surface 243 and the reflective surface 245 are connected to the first edge 241a and the second edge 241b, respectively. As shown in FIG. 6, the frame 220 has a placement portion 221, and the connector 260 is disposed on the placement portion 221. In an embodiment, the connecting member 260 can be an adhesive tape and is attached to the optical surface 243 of the light guide plate 240 near the light incident surface 241 . Thereby, the light guide plate 240 can be fixed to the frame 220 through the connecting member 260. It is to be understood that in some embodiments, a recess may be provided on the optical surface 243 of the light guide plate 240 to accommodate the connector 260.

Referring to FIG. 6 , in the embodiment, the light source 280 is disposed beside the light incident surface 241 , and the light generated by the light source 280 enters the light guide plate 240 from the light incident surface 241 and is emitted from the optical surface 243 . As shown in FIG. 6, in the present embodiment, the light incident surface 241 of the light guide plate 240 is a sloped surface. In the present embodiment, the first edge 241a of the light incident surface 241 and the optical surface 243 is separated from the light source 280 by the second edge 241b connected to the light surface 241 and the reflective surface 245. borrow Therefore, all or part of the light generated by the light source 280 is refracted through the light incident surface 241 and enters the light guide plate 240, and can be directed away from the connecting member 260, thereby avoiding the light. The problem of uneven light emission is caused by reflection or absorption by the connecting member 260.

It is to be noted that in the embodiment shown in FIG. 6, the light incident surface 241 of the light guide plate 240 can also be provided with microstructures 141c, 141d and 141e as shown in FIGS. 3 to 5. Thereby, the light incident angles and uniformity of the light generated by the light source 280 can be increased through the microstructures 141c, 141d, and 141e, and the problem that the light guide plate 240 is adjacent to the light incident surface 241 can be avoided.

Please refer to FIG. 7 , which is a partial schematic diagram of a display device according to an embodiment of the present invention. The display device 300 of the present embodiment includes a backlight module 100 and a display panel 310 as shown in FIG. 1 . As shown in FIG. 7 , the display panel 310 is disposed in front of the light guide plate 140 of the backlight module 100 , and the same purpose as described above can be achieved, and thus will not be described herein. It is to be understood that the backlight module 100 shown in FIG. 1 is applied to the display device 300 for illustrative purposes only, and is not intended to limit the present invention. In other embodiments, the backlight module 200 shown in FIG. 6 can also be applied to a display device to produce the same effect.

According to the embodiment of the present invention, the present invention is designed to reduce the incidence of light entering the light guide plate from the light incident surface and to the connecting member through the design of the light incident surface of the light guide plate. Thereby, the light entering the light guide plate can be greatly reduced, which is affected by uncertain factors such as reflection or absorption of the connecting member, thereby improving the problem of uneven light emission of the backlight module.

On the other hand, the light incident surface of the light guide plate is provided with a microstructure, thereby increasing the light incident angle and uniformity of the light generated by the light source, and also avoiding the problem that the light guide plate is darkened at a portion close to the light incident surface.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any one skilled in the art can make various changes and retouchings without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Backlight module

120‧‧‧Frame

121‧‧‧Placement Department

140‧‧‧Light guide plate

141‧‧‧Into the glossy surface

141a‧‧‧ first edge

141b‧‧‧ second edge

143‧‧‧Optical surface

145‧‧‧Glossy

160‧‧‧Connecting parts

180‧‧‧Light source

Claims (9)

A backlight module includes: a frame; a light guide plate disposed in the frame, wherein the light guide plate includes a light incident surface and an optical surface connected to the light incident surface, wherein the light incident surface is a sloped surface, and the light incident surface is a sloped surface a plurality of microstructures are disposed on the light incident surface; a connecting member is disposed on the optical surface and adjacent to the light incident surface for fixing the light guide plate to the frame; and a light source adjacent to the light incident surface And all or part of the light generated by the light source is refracted by the incident surface of the inclined surface, and is directed away from the connecting member after entering the light guide plate. The backlight module of claim 1, wherein the optical surface is a reflective surface; the light guide plate further includes a light emitting surface opposite to the optical surface; and the light incident surface is connected to the optical surface. The edge is closer to the light source than the second edge of the light incident surface and the light exit surface. The backlight module of claim 1, wherein the optical surface is a light emitting surface; the light guiding plate further comprises a reflecting surface opposite to the optical surface; and the light incident surface is connected to the optical surface. The edge is closer to the light source than the second edge of the light incident surface and the reflective surface. The backlight module of claim 1, wherein each of the microstructures is a strip structure, and each of the microstructures extends in a direction parallel to an oblique direction of the light incident surface. The backlight module of claim 1, wherein each of the microstructures is a strip structure, and each of the microstructures extends in a direction perpendicular to an oblique direction of the light incident surface. The backlight module of claim 1, wherein each of the microstructures is a dot structure or a 稜鏡 structure. The backlight module of claim 1, wherein the frame has a placement portion, and the connector is disposed at the placement portion. The backlight module of claim 1, wherein the connecting member is an adhesive tape. A display device comprising: a backlight module according to any one of claims 1 to 8; and a display panel located in front of the light guide plate.